This document describes a new Compton scattered tomography modality and its application to non-destructive material evaluation, specifically for concrete. The modality utilizes Compton scattering of gamma rays to reconstruct the electron density distribution within an object. Data is acquired by rotating a gamma ray source and detector around the object, collecting scattered radiation along circular arcs. The electron density can then be reconstructed using an inverse Radon transform formula. Simulations demonstrate the viability of using this technique to image rebar grids and cracks within concrete samples. The reconstructed electron density provides complementary information to attenuation-based techniques for non-destructive concrete evaluation.
Investigating material decay of historical buildings using visual analytics w...Beniamino Murgante
Investigating material decay of historical buildings using visual analytics with multi-temporal infrared thermographic data
Urska Demsar, Martin Charlton – National Centre for Geocomputation, National University of Ireland , Maynooth ( Ireland )
Nicola Masini, Maria Danese – Archaeological and monumental heritage institute, National Research Council, Potenza ( Italy )
Intelligent Analysis of Environmental Data (S4 ENVISA Workshop 2009)
This document describes a study using rheo-optical near-infrared (NIR) spectroscopy to analyze the molecular-level deformation of low-density polyethylene (LDPE) during mechanical tensile testing. NIR spectra were collected from an LDPE sample under increasing strain. Two-dimensional correlation analysis with projection was used to filter out spectral changes from baseline fluctuations caused by sample thickness changes, in order to reveal deformation-related spectral features. The analysis identified predominant extension of amorphous tie chains followed by rotation of crystalline lamellae, corresponding to elastic and plastic deformation of the LDPE.
IRJET- Graphene based Terahertz Patch AntennaIRJET Journal
1) The document describes the design and simulation of a graphene-based microstrip patch antenna for terahertz communications. Graphene was used as it has superior performance over other materials like polyimide, rubber, polyethylene and polyamide in terms of return loss, VSWR, gain and radiation efficiency.
2) A microstrip patch antenna was designed using graphene with a resonant frequency of 2.8 THz. Simulation results showed a return loss of -18.7 dB and VSWR of 1.28.
3) The performance of the graphene-based antenna was compared to antennas using other materials. The graphene antenna showed better performance than antennas made from polyimide, polyamide, polyethylene and rubber
REPORT on the Activities of Core FacilitiesCeitecNano
The document reports on the activities of core facilities for nanofabrication, nanocharacterization, and structural analysis at CEITEC. It provides a timeline of the facilities' development since 2008 and outlines their vision, staff, instruments, usage, costs, services, technological capabilities, organizational structure, and collaborations. The facilities aim to provide researchers open access to cutting-edge instrumentation through training and expert support. Summaries of several collaboration projects demonstrate how the facilities support multidisciplinary research.
Terahertz Microstrip Patch Antenna Design for detection of Plastic Explosive ...IRJET Journal
This document describes the design and simulation of a terahertz microstrip patch antenna for detecting the plastic explosive SEMTEX. The antenna is designed using FR4 as the substrate material with a thickness of 1.62 μm and dielectric constant of 4.4. Copper is used for the radiating patch and ground plane. Computer Simulation Technology (CST) Microwave Studio is used to simulate the antenna. The results show the antenna resonates at 4.32 THz with a return loss of -52.10 dB, gain of 5.88 dB, directivity of 5.75 dBi, and input impedance of 49.15 Ω, making it suitable for detecting SEMTEX.
Automatic dynamic focusing through interfaces (abstract)Jose Miguel Moreno
This document presents a new approach to automatic dynamic focusing through interfaces in non-destructive testing. The approach converts the two propagation media scenario into a single homogeneous medium, allowing for faster computation of focal laws. It then uses a specialized focusing hardware initialized with a few values to perform dynamic focusing at all output samples in real-time, avoiding the need for intensive iterative computations. Experimental results show the technique achieves small enough focusing errors to validate its use across many applications, with resolution and dynamic range almost unaffected compared to conventional offline computation methods. It significantly reduces both computation time and storage requirements for the testing equipment.
This document provides an overview of 3D printing techniques and applications in optics and photonics. It discusses several common 3D printing methods like fused deposition modeling, polyjet printing, and direct ink writing. It also outlines key materials used in 3D printing like metals, polymers, and ceramics. The document reviews applications of 3D printing in areas like optics, photonics, metamaterials, and terahertz components. It also highlights some challenges of 3D printing like high costs and limited applications for large structures. In closing, it provides examples of recent work on 3D printed dielectric reflectarrays and spiral phase plates.
This document summarizes research into developing a lower-cost method for real-time terahertz (THz) imaging using digital light processing and compressed sensing. The method projects coded apertures onto silicon using a DLP projector instead of fixed physical masks, allowing reconfigurable apertures. It also uses compressed sensing to reduce frame acquisition times by at least 40%, bringing real-time video rates closer to feasibility. The researchers believe with optimization, their approach could achieve real-time video imaging at resolutions up to 1k pixels for applications like medical diagnostics and quality control.
Investigating material decay of historical buildings using visual analytics w...Beniamino Murgante
Investigating material decay of historical buildings using visual analytics with multi-temporal infrared thermographic data
Urska Demsar, Martin Charlton – National Centre for Geocomputation, National University of Ireland , Maynooth ( Ireland )
Nicola Masini, Maria Danese – Archaeological and monumental heritage institute, National Research Council, Potenza ( Italy )
Intelligent Analysis of Environmental Data (S4 ENVISA Workshop 2009)
This document describes a study using rheo-optical near-infrared (NIR) spectroscopy to analyze the molecular-level deformation of low-density polyethylene (LDPE) during mechanical tensile testing. NIR spectra were collected from an LDPE sample under increasing strain. Two-dimensional correlation analysis with projection was used to filter out spectral changes from baseline fluctuations caused by sample thickness changes, in order to reveal deformation-related spectral features. The analysis identified predominant extension of amorphous tie chains followed by rotation of crystalline lamellae, corresponding to elastic and plastic deformation of the LDPE.
IRJET- Graphene based Terahertz Patch AntennaIRJET Journal
1) The document describes the design and simulation of a graphene-based microstrip patch antenna for terahertz communications. Graphene was used as it has superior performance over other materials like polyimide, rubber, polyethylene and polyamide in terms of return loss, VSWR, gain and radiation efficiency.
2) A microstrip patch antenna was designed using graphene with a resonant frequency of 2.8 THz. Simulation results showed a return loss of -18.7 dB and VSWR of 1.28.
3) The performance of the graphene-based antenna was compared to antennas using other materials. The graphene antenna showed better performance than antennas made from polyimide, polyamide, polyethylene and rubber
REPORT on the Activities of Core FacilitiesCeitecNano
The document reports on the activities of core facilities for nanofabrication, nanocharacterization, and structural analysis at CEITEC. It provides a timeline of the facilities' development since 2008 and outlines their vision, staff, instruments, usage, costs, services, technological capabilities, organizational structure, and collaborations. The facilities aim to provide researchers open access to cutting-edge instrumentation through training and expert support. Summaries of several collaboration projects demonstrate how the facilities support multidisciplinary research.
Terahertz Microstrip Patch Antenna Design for detection of Plastic Explosive ...IRJET Journal
This document describes the design and simulation of a terahertz microstrip patch antenna for detecting the plastic explosive SEMTEX. The antenna is designed using FR4 as the substrate material with a thickness of 1.62 μm and dielectric constant of 4.4. Copper is used for the radiating patch and ground plane. Computer Simulation Technology (CST) Microwave Studio is used to simulate the antenna. The results show the antenna resonates at 4.32 THz with a return loss of -52.10 dB, gain of 5.88 dB, directivity of 5.75 dBi, and input impedance of 49.15 Ω, making it suitable for detecting SEMTEX.
Automatic dynamic focusing through interfaces (abstract)Jose Miguel Moreno
This document presents a new approach to automatic dynamic focusing through interfaces in non-destructive testing. The approach converts the two propagation media scenario into a single homogeneous medium, allowing for faster computation of focal laws. It then uses a specialized focusing hardware initialized with a few values to perform dynamic focusing at all output samples in real-time, avoiding the need for intensive iterative computations. Experimental results show the technique achieves small enough focusing errors to validate its use across many applications, with resolution and dynamic range almost unaffected compared to conventional offline computation methods. It significantly reduces both computation time and storage requirements for the testing equipment.
This document provides an overview of 3D printing techniques and applications in optics and photonics. It discusses several common 3D printing methods like fused deposition modeling, polyjet printing, and direct ink writing. It also outlines key materials used in 3D printing like metals, polymers, and ceramics. The document reviews applications of 3D printing in areas like optics, photonics, metamaterials, and terahertz components. It also highlights some challenges of 3D printing like high costs and limited applications for large structures. In closing, it provides examples of recent work on 3D printed dielectric reflectarrays and spiral phase plates.
This document summarizes research into developing a lower-cost method for real-time terahertz (THz) imaging using digital light processing and compressed sensing. The method projects coded apertures onto silicon using a DLP projector instead of fixed physical masks, allowing reconfigurable apertures. It also uses compressed sensing to reduce frame acquisition times by at least 40%, bringing real-time video rates closer to feasibility. The researchers believe with optimization, their approach could achieve real-time video imaging at resolutions up to 1k pixels for applications like medical diagnostics and quality control.
Analysis and simulations of optimal geometry shapes of the 4 and 9 nano hole ...IJECEIAES
The possibility to limit and manipulate photons at nanometer scales attracted a lot of interest for exciting applications from subwavelength in laser, biosensors, biomedical and optoelectronics devices, the sensor optical properties, however; are complex due to two resonances through propagating and localized surface plasmons. The optical properties of surface plasmons (SPs) at the resonant wavelength is depending on the geometrical nanostructure of materials. In this article, we used different geometry of nanoholes array, 4 and 9 nanoholes array in a metallic film gold nanoparticle with different thickness (20,50,100) nm on SiO2 substrate with refractive index 1.46, we designed two different geometries; 4- holes: hole radius r1=200 nm, period p1=600 nm; and 9- holes: r2=100 nm, period p2=300 nm. Transmission and reflection spectrum have been calculated and simulated by FDTD Lumerical program. From results are observed the effect of thickness is interesting, transmission is increased at (t=20nm) for two arrays. Furthermore, the number of hole and its area has an influence on optical transmission and other parameters (E, H, Ref) which are characteristics of design of metallic nanostructure. We can see that there is a peak value of the wavelength at 519 nm approximately to 73% strong light transmission with 4-NHA in the other hand wavelength of 519 nm transmission is 45% with 9-NHA. strong light transmission is hopeful for many applications (biomedical devices, nanoantennas and laser optical fiber).
This document presents a texture-driven approach for visible spectrum fire detection on mobile robots. It uses random forests to classify regions as fire or non-fire based on color, texture, and temporal features. The approach is evaluated on a dataset of 24 videos containing over 28,000 frames with annotated fire regions. Experimental results show the approach achieves an accuracy of 92% and an F1 score of 90%, outperforming previous methods. Texture features are found to improve performance over color features alone.
What is time-resolved cathodoluminescence?Delmic B.V.
Time-resolved cathodoluminescence is a technique in which the time dynamics of the cathodoluminescence emission process is observed.
This presentation will give you an overview of the time-resolved cathodoluminescence techniques: lifetime imaging (or emission decay) and g(2) imaging, which is also known in physics as second-order correlation function.
The SPARC is a high-performance cathodoluminescence detection system designed and produced by Delmic, which offers a unique solution for cathodoluminescence imaging. With the Delmic LAB Cube (a time-resolved CL module) for the SPARC, it is possible to extend the SPARC to do lifetime and antibunching experiments.
For questions about cathodoluminescence, the SPARC and the LAB Cube, please leave a comment below or
visit www.delmic.com and send us an email.
Cathodoluminescence for Gallium Nitride Semiconductor MaterialsDelmic B.V.
Cathodoluminescence can be used to study ceramics, dielectrics and semiconductors (both in bulk and nanostructured materials) and to determine their light-emitting properties at the nanoscale.
This presentation helps you to understand how cathodoluminescence works and its application for gallium nitride semiconductor materials.
The SPARC is a high-performance cathodoluminescence detection system that is designed and produced by Delmic. Using our cathodoluminescence system, you will get a valuable source of information and a full experimental freedom with an open-source software and modularity of the system.
For questions about cathodoluminescence and the SPARC, please leave a comment below or visit www.delmic.com and send us a message.
If you would like to download more application notes about cathodoluminescence for materials science please find them at this link:
http://www.delmic.com/cathodoluminescence-materials-science
This document summarizes research on using magneto-optic imaging for non-destructive testing of metal structures. It describes developing new thin-film sensors with improved sensitivity, integrating the sensors and image recognition algorithms into a portable system, and applying a neural network algorithm called SONON to enhance defect detection in images. Laboratory experiments demonstrated the new sensors could detect smaller defects than previous methods. The overall aim is more accurate, automated inspections using portable, wearable equipment.
The document summarizes a research project on single image haze removal using a variable fog-weight. It begins with an introduction on how haze degrades image quality and the need for haze removal techniques. It then discusses the motivation, literature review, objective, and main contribution of the proposed method. The method uses the dark channel prior to estimate the transmission map and atmospheric light. It then applies a variable fog-weight to modify the transmission map and reduce halo artifacts. A guided filter is used for transmission refinement before recovering the haze-free scene radiance. The method aims to improve on existing techniques by reducing time complexity and halo artifacts while enhancing image visibility.
3D EBSD Overview - Metallurgical Mater Trans A Vol 39 A (2008) 374Dierk Raabe
This document describes a new technique for 3D characterization of crystalline microstructures using serial sectioning with a focused ion beam and electron backscatter diffraction (EBSD) in a scanning electron microscope. Key points:
- Serial sectioning is used to cut thin sections from the sample, which are then characterized using EBSD orientation microscopy to determine crystal orientations in 3D.
- This allows full crystallographic characterization of microstructural features like interfaces that is not possible with conventional 2D analysis.
- The technique achieves resolutions as fine as 50x50x50 nm3 and can characterize sample volumes up to 50x50x50 μm3.
- Examples demonstrate applications to characterize microstructures like
This document discusses a novel magneto-optic sensor called the MODE sensor that can be used for non-destructive testing of structural integrity. The MODE sensor uses thin films made of rare earth and transition metal oxides that have high magneto-optic properties, allowing it to detect cracks, fissures, and corrosion in structures. A portable system has been designed using this sensor to allow real-time inspection of bridges, fuel tanks, and other metal structures. The system includes image processing and pattern recognition capabilities to help identify defects.
This document proposes an imaging technique that models targets as a superposition of infinitesimally small dipoles rather than point scatterers. It describes how the orientation of each dipole is represented by a dyadic contrast function and how this allows determining the orientation of dipoles, providing additional target information. Experimental results are shown for improving electromagnetic interference rejection using a distributed aperture MIMO radar configuration and for achieving improved resolution through coherent fusion imaging across distributed apertures.
This document provides a summary of the professional experience of Lavinia Elena Nistor, Ph.D. It outlines her work in research and development roles focused on non-volatile memory technologies like resistive RAM and phase change RAM. Some of her responsibilities included writing documentation, characterizing deposited alloys, and developing sputtering processes. She also has experience with magnetic random access memory projects involving characterization of magnetic tunnel junctions and translating results into tool and process solutions. Her education includes a PhD in Materials Science and experience in related research internships and associations.
This document describes a study using wavelet transform to enhance contrast in mammographic images of a phantom. The methodology involved developing a mammographic phantom with anatomical features, acquiring images using a digital mammography system, preprocessing the images using Gaussian filtering, enhancing the images using biorthogonal 2.8 wavelet filtering, and having observers interpret and score the original and enhanced images in a receiver operating characteristic analysis. The results showed that wavelet transform enhancement improved detection of micronodules but did not significantly improve detection of nodules or fibrils compared to the original images. Wavelet transform was found to reduce noise and improve contrast.
Alexander Serov has extensive experience and education in physics, mathematics, engineering, and philosophy. He has developed several numerical simulation methods and software, including for modeling ultrasonic waves, Maxwell's equations, molecular dynamics, and MEMS. His background qualifies him for positions requiring strong analytical skills and experience with computational modeling across various scientific domains.
This document describes an improved particle filter tracking system that uses both color and moving edge information. It aims to address limitations of existing color-based particle filter tracking systems, such as inaccurate tracking when the target and background have similar colors, occlusion occurs, or the target is deformed. The proposed system selects an appropriate bounding box around the target using moving edge information to maintain an accurate target model during tracking. An experiment using 100 targets in 10 video clips showed the new system achieved a 94.6% accuracy rate for tracking, higher than an existing color-based particle filter system. It also had a 91.8% accuracy for occluded targets, much better than the previous system.
Application of non destructive test for structural health monitoring - state ...eSAT Journals
Abstract
The concept of non-destructive testing (NDT) is to obtain material properties “in place” specimens without the destruction of the specimens and to do the structural health monitoring. NDT using Rebound hammer, Ultra pulse velocity, Half-cell potential, core cutter, carbonation depth, rebar locator, Rapid chloride penetration test, electric resistivity meter test and vibration base analysis by data analoger are very popular and highly effective in conducting structural health monitoring. The structure can be investigated by using a visual inspection, NDT, laboratory and field test performance. In this article a review of these tests have been provided to conduct effective structural health monitoring of a RCC structure
Keywords: Non-destructive test, visual inspection, corrosion, compressive strength
IRJET- Tool: Segregration of Bands in Sentinel Data and Calculation of NDVIIRJET Journal
This document discusses using satellite imagery and vegetation indices to analyze and map vegetation. It summarizes several research papers on using the Normalized Difference Vegetation Index (NDVI) with different sensors and techniques. Specifically, it examines calculating NDVI from mountain terrain satellite data, using selected bands from Sentinel-2 satellite data for agriculture applications, extracting buildings from satellite images using shadow detection, and applying NDVI to unmanned aerial system multispectral remote sensing for post-disaster assessment. The document also discusses preprocessing techniques and algorithms like random forests and support vector machines for satellite image classification.
Opal and inverse opal structures for optical device applicationsM. Faisal Halim
This document summarizes research on developing an all-optical silicon transistor using an opal/inverse opal photonic crystal heterostructure. Photonic crystals can act as optical waveguides and switches by manipulating light transmission through periodic dielectric structures. Most work so far uses non-silicon materials at scales above 200nm, but inverse opals have potential at the nanoscale using silicon. The document outlines challenges in developing 1D, 2D and 3D photonic crystals and integrating them with silicon chips. It then describes how opals and inverse opals are made and their photonic bandgap properties. Current research is working to shrink features below 100nm for visible light applications in silicon. The goal is an all-opt
Victor Pashkov's CV outlines his education and experience developing optical and electronic instruments, including a LIDAR system, improving the GLONASS navigation message, simulating an optical electronic instrument with CCD matrices for space navigation, designing an optical switch and laser projection system, and managing projects for an optical projection TV and LED backlight unit for LCD displays.
Electron backscatter diffraction in materialsImtiaz Ali
This document provides an overview of electron backscatter diffraction (EBSD), including its history, working principles, applications, strengths, and limitations. EBSD uses electron diffraction patterns captured in a scanning electron microscope to determine grain morphology, crystallographic orientation, and phase composition of materials. The technique has been improved over time through automation and integration with other characterization methods. It provides fast, reliable microstructural characterization of crystalline materials and is widely used in materials science research and industry.
This document discusses using k-means clustering to detect minerals from remote sensing images. It begins with an abstract describing using k-means clustering on hyperspectral images to segment and extract features to detect minerals like giacomo. It then provides background on remote sensing, k-means clustering algorithms, and describes the giacomo mineral deposit in Peru that contains silicon dioxide and titanium dioxide. It concludes with discussing using sobel edge detection as part of the mineral detection process from remote sensing images.
The technology proposes a simple method which removes phase distorsions without increasing noise, and can be implemented in any interferometer with active phase control (fiber-optic, integrated, free-space).
During the last decades a large effort has been invested in the development of a new
discipline devoted to benefit from optical excitations in materials where metals are
key element (Plasmonics). We will make an introduction on this topic below, but let’s
anticipate that two application areas are sensing and information technologies.
The following height extended abstracts, presented during the one-day NANOMAGMA
Symposium (Bilbao, Spain – April 13, 2011 reflects some of the latest developments on magneto-plasmonics.
In 2010 and 2011, the nanoICT project (EU/ICT/FET Coordination Action) launched
two calls for exchange visits for PhD students with the following main objectives: 1.
To perform joint work or to be trained in the leading European industrial and academic research institutions; 2. To enhance long-term collaborations within the ERA; 3. To
generate high-skilled personnel and to facilitate technology transfer;
The first outcome report was published in the issue 22 (August 2011) and this edition
contains four new articles providing insights in relevant fi elds for nanoICT.
We would like to thank all the authors who contributed to this issue as well as the European Commission for the financial support (projects nanoICT No. 216165 and NANOMAGMA No. FP7-214107-2).
Dr. Antonio Correia Editor - Phantoms Foundation
Luigi Giubbolini | Microwave Nondestructive Testing of Composite MaterialsLuigi Giubbolini
Microwave Nondestructive Testing (MNDT) techniques have advantages over other NDT methods (such as radiography, ultrasonics, and eddy current) regarding low cost, good penetration in nonmetallic materials, good resolution and contactless feature of the microwave sensor (antenna).
Analysis and simulations of optimal geometry shapes of the 4 and 9 nano hole ...IJECEIAES
The possibility to limit and manipulate photons at nanometer scales attracted a lot of interest for exciting applications from subwavelength in laser, biosensors, biomedical and optoelectronics devices, the sensor optical properties, however; are complex due to two resonances through propagating and localized surface plasmons. The optical properties of surface plasmons (SPs) at the resonant wavelength is depending on the geometrical nanostructure of materials. In this article, we used different geometry of nanoholes array, 4 and 9 nanoholes array in a metallic film gold nanoparticle with different thickness (20,50,100) nm on SiO2 substrate with refractive index 1.46, we designed two different geometries; 4- holes: hole radius r1=200 nm, period p1=600 nm; and 9- holes: r2=100 nm, period p2=300 nm. Transmission and reflection spectrum have been calculated and simulated by FDTD Lumerical program. From results are observed the effect of thickness is interesting, transmission is increased at (t=20nm) for two arrays. Furthermore, the number of hole and its area has an influence on optical transmission and other parameters (E, H, Ref) which are characteristics of design of metallic nanostructure. We can see that there is a peak value of the wavelength at 519 nm approximately to 73% strong light transmission with 4-NHA in the other hand wavelength of 519 nm transmission is 45% with 9-NHA. strong light transmission is hopeful for many applications (biomedical devices, nanoantennas and laser optical fiber).
This document presents a texture-driven approach for visible spectrum fire detection on mobile robots. It uses random forests to classify regions as fire or non-fire based on color, texture, and temporal features. The approach is evaluated on a dataset of 24 videos containing over 28,000 frames with annotated fire regions. Experimental results show the approach achieves an accuracy of 92% and an F1 score of 90%, outperforming previous methods. Texture features are found to improve performance over color features alone.
What is time-resolved cathodoluminescence?Delmic B.V.
Time-resolved cathodoluminescence is a technique in which the time dynamics of the cathodoluminescence emission process is observed.
This presentation will give you an overview of the time-resolved cathodoluminescence techniques: lifetime imaging (or emission decay) and g(2) imaging, which is also known in physics as second-order correlation function.
The SPARC is a high-performance cathodoluminescence detection system designed and produced by Delmic, which offers a unique solution for cathodoluminescence imaging. With the Delmic LAB Cube (a time-resolved CL module) for the SPARC, it is possible to extend the SPARC to do lifetime and antibunching experiments.
For questions about cathodoluminescence, the SPARC and the LAB Cube, please leave a comment below or
visit www.delmic.com and send us an email.
Cathodoluminescence for Gallium Nitride Semiconductor MaterialsDelmic B.V.
Cathodoluminescence can be used to study ceramics, dielectrics and semiconductors (both in bulk and nanostructured materials) and to determine their light-emitting properties at the nanoscale.
This presentation helps you to understand how cathodoluminescence works and its application for gallium nitride semiconductor materials.
The SPARC is a high-performance cathodoluminescence detection system that is designed and produced by Delmic. Using our cathodoluminescence system, you will get a valuable source of information and a full experimental freedom with an open-source software and modularity of the system.
For questions about cathodoluminescence and the SPARC, please leave a comment below or visit www.delmic.com and send us a message.
If you would like to download more application notes about cathodoluminescence for materials science please find them at this link:
http://www.delmic.com/cathodoluminescence-materials-science
This document summarizes research on using magneto-optic imaging for non-destructive testing of metal structures. It describes developing new thin-film sensors with improved sensitivity, integrating the sensors and image recognition algorithms into a portable system, and applying a neural network algorithm called SONON to enhance defect detection in images. Laboratory experiments demonstrated the new sensors could detect smaller defects than previous methods. The overall aim is more accurate, automated inspections using portable, wearable equipment.
The document summarizes a research project on single image haze removal using a variable fog-weight. It begins with an introduction on how haze degrades image quality and the need for haze removal techniques. It then discusses the motivation, literature review, objective, and main contribution of the proposed method. The method uses the dark channel prior to estimate the transmission map and atmospheric light. It then applies a variable fog-weight to modify the transmission map and reduce halo artifacts. A guided filter is used for transmission refinement before recovering the haze-free scene radiance. The method aims to improve on existing techniques by reducing time complexity and halo artifacts while enhancing image visibility.
3D EBSD Overview - Metallurgical Mater Trans A Vol 39 A (2008) 374Dierk Raabe
This document describes a new technique for 3D characterization of crystalline microstructures using serial sectioning with a focused ion beam and electron backscatter diffraction (EBSD) in a scanning electron microscope. Key points:
- Serial sectioning is used to cut thin sections from the sample, which are then characterized using EBSD orientation microscopy to determine crystal orientations in 3D.
- This allows full crystallographic characterization of microstructural features like interfaces that is not possible with conventional 2D analysis.
- The technique achieves resolutions as fine as 50x50x50 nm3 and can characterize sample volumes up to 50x50x50 μm3.
- Examples demonstrate applications to characterize microstructures like
This document discusses a novel magneto-optic sensor called the MODE sensor that can be used for non-destructive testing of structural integrity. The MODE sensor uses thin films made of rare earth and transition metal oxides that have high magneto-optic properties, allowing it to detect cracks, fissures, and corrosion in structures. A portable system has been designed using this sensor to allow real-time inspection of bridges, fuel tanks, and other metal structures. The system includes image processing and pattern recognition capabilities to help identify defects.
This document proposes an imaging technique that models targets as a superposition of infinitesimally small dipoles rather than point scatterers. It describes how the orientation of each dipole is represented by a dyadic contrast function and how this allows determining the orientation of dipoles, providing additional target information. Experimental results are shown for improving electromagnetic interference rejection using a distributed aperture MIMO radar configuration and for achieving improved resolution through coherent fusion imaging across distributed apertures.
This document provides a summary of the professional experience of Lavinia Elena Nistor, Ph.D. It outlines her work in research and development roles focused on non-volatile memory technologies like resistive RAM and phase change RAM. Some of her responsibilities included writing documentation, characterizing deposited alloys, and developing sputtering processes. She also has experience with magnetic random access memory projects involving characterization of magnetic tunnel junctions and translating results into tool and process solutions. Her education includes a PhD in Materials Science and experience in related research internships and associations.
This document describes a study using wavelet transform to enhance contrast in mammographic images of a phantom. The methodology involved developing a mammographic phantom with anatomical features, acquiring images using a digital mammography system, preprocessing the images using Gaussian filtering, enhancing the images using biorthogonal 2.8 wavelet filtering, and having observers interpret and score the original and enhanced images in a receiver operating characteristic analysis. The results showed that wavelet transform enhancement improved detection of micronodules but did not significantly improve detection of nodules or fibrils compared to the original images. Wavelet transform was found to reduce noise and improve contrast.
Alexander Serov has extensive experience and education in physics, mathematics, engineering, and philosophy. He has developed several numerical simulation methods and software, including for modeling ultrasonic waves, Maxwell's equations, molecular dynamics, and MEMS. His background qualifies him for positions requiring strong analytical skills and experience with computational modeling across various scientific domains.
This document describes an improved particle filter tracking system that uses both color and moving edge information. It aims to address limitations of existing color-based particle filter tracking systems, such as inaccurate tracking when the target and background have similar colors, occlusion occurs, or the target is deformed. The proposed system selects an appropriate bounding box around the target using moving edge information to maintain an accurate target model during tracking. An experiment using 100 targets in 10 video clips showed the new system achieved a 94.6% accuracy rate for tracking, higher than an existing color-based particle filter system. It also had a 91.8% accuracy for occluded targets, much better than the previous system.
Application of non destructive test for structural health monitoring - state ...eSAT Journals
Abstract
The concept of non-destructive testing (NDT) is to obtain material properties “in place” specimens without the destruction of the specimens and to do the structural health monitoring. NDT using Rebound hammer, Ultra pulse velocity, Half-cell potential, core cutter, carbonation depth, rebar locator, Rapid chloride penetration test, electric resistivity meter test and vibration base analysis by data analoger are very popular and highly effective in conducting structural health monitoring. The structure can be investigated by using a visual inspection, NDT, laboratory and field test performance. In this article a review of these tests have been provided to conduct effective structural health monitoring of a RCC structure
Keywords: Non-destructive test, visual inspection, corrosion, compressive strength
IRJET- Tool: Segregration of Bands in Sentinel Data and Calculation of NDVIIRJET Journal
This document discusses using satellite imagery and vegetation indices to analyze and map vegetation. It summarizes several research papers on using the Normalized Difference Vegetation Index (NDVI) with different sensors and techniques. Specifically, it examines calculating NDVI from mountain terrain satellite data, using selected bands from Sentinel-2 satellite data for agriculture applications, extracting buildings from satellite images using shadow detection, and applying NDVI to unmanned aerial system multispectral remote sensing for post-disaster assessment. The document also discusses preprocessing techniques and algorithms like random forests and support vector machines for satellite image classification.
Opal and inverse opal structures for optical device applicationsM. Faisal Halim
This document summarizes research on developing an all-optical silicon transistor using an opal/inverse opal photonic crystal heterostructure. Photonic crystals can act as optical waveguides and switches by manipulating light transmission through periodic dielectric structures. Most work so far uses non-silicon materials at scales above 200nm, but inverse opals have potential at the nanoscale using silicon. The document outlines challenges in developing 1D, 2D and 3D photonic crystals and integrating them with silicon chips. It then describes how opals and inverse opals are made and their photonic bandgap properties. Current research is working to shrink features below 100nm for visible light applications in silicon. The goal is an all-opt
Victor Pashkov's CV outlines his education and experience developing optical and electronic instruments, including a LIDAR system, improving the GLONASS navigation message, simulating an optical electronic instrument with CCD matrices for space navigation, designing an optical switch and laser projection system, and managing projects for an optical projection TV and LED backlight unit for LCD displays.
Electron backscatter diffraction in materialsImtiaz Ali
This document provides an overview of electron backscatter diffraction (EBSD), including its history, working principles, applications, strengths, and limitations. EBSD uses electron diffraction patterns captured in a scanning electron microscope to determine grain morphology, crystallographic orientation, and phase composition of materials. The technique has been improved over time through automation and integration with other characterization methods. It provides fast, reliable microstructural characterization of crystalline materials and is widely used in materials science research and industry.
This document discusses using k-means clustering to detect minerals from remote sensing images. It begins with an abstract describing using k-means clustering on hyperspectral images to segment and extract features to detect minerals like giacomo. It then provides background on remote sensing, k-means clustering algorithms, and describes the giacomo mineral deposit in Peru that contains silicon dioxide and titanium dioxide. It concludes with discussing using sobel edge detection as part of the mineral detection process from remote sensing images.
The technology proposes a simple method which removes phase distorsions without increasing noise, and can be implemented in any interferometer with active phase control (fiber-optic, integrated, free-space).
During the last decades a large effort has been invested in the development of a new
discipline devoted to benefit from optical excitations in materials where metals are
key element (Plasmonics). We will make an introduction on this topic below, but let’s
anticipate that two application areas are sensing and information technologies.
The following height extended abstracts, presented during the one-day NANOMAGMA
Symposium (Bilbao, Spain – April 13, 2011 reflects some of the latest developments on magneto-plasmonics.
In 2010 and 2011, the nanoICT project (EU/ICT/FET Coordination Action) launched
two calls for exchange visits for PhD students with the following main objectives: 1.
To perform joint work or to be trained in the leading European industrial and academic research institutions; 2. To enhance long-term collaborations within the ERA; 3. To
generate high-skilled personnel and to facilitate technology transfer;
The first outcome report was published in the issue 22 (August 2011) and this edition
contains four new articles providing insights in relevant fi elds for nanoICT.
We would like to thank all the authors who contributed to this issue as well as the European Commission for the financial support (projects nanoICT No. 216165 and NANOMAGMA No. FP7-214107-2).
Dr. Antonio Correia Editor - Phantoms Foundation
Luigi Giubbolini | Microwave Nondestructive Testing of Composite MaterialsLuigi Giubbolini
Microwave Nondestructive Testing (MNDT) techniques have advantages over other NDT methods (such as radiography, ultrasonics, and eddy current) regarding low cost, good penetration in nonmetallic materials, good resolution and contactless feature of the microwave sensor (antenna).
OPTIC NANO Consult S.A.R.L provides scientific support in spectroscopic ellipsometry and polarimetry metrology for thin films and new materials. It was founded in 2011 and collaborates with research institutes, laboratories, and foundries. OPTIC NANO aims to give expert attention and advice within global research projects, using complementary advanced measurement techniques and modeling to investigate new products and materials while preserving confidentiality. The company's expertise comes from years of research experience in optics and relationships with instrument developers.
This document summarizes research verifying simulations of a novel muon radiography detector system through experimentation. It estimates the detector's spatial resolution as 9.32mm, better than the 1cm reported previously. It also explores the detector's imaging potential through both simulation and initial promising experimental results. The document provides background on muon production, tomography using scattering angles, and radiography using transmission measurements. It describes common detector types and current applications like border security using large-scale muon tomography to detect nuclear materials more effectively than gamma-ray systems.
This document provides a review of using x-ray computed tomography (XCT) for additive manufacturing (AM). It begins with introductions to the principles of XCT and various AM processes. Historically, XCT and AM were first combined in 1990 to create a 3D model of a skull for medical purposes. Between 1995-2005, uses expanded from medical modeling to include XCT being used as an inspection tool to quantitatively measure AM parts. Current research focuses on using XCT for porosity measurements and general dimensional measurements of AM parts. Limitations in resolution hinder porosity measurements, while surface texture measurement needs more research.
Damage detection in cfrp plates by means of numerical modeling of lamb waves ...eSAT Journals
Abstract
The paper presents an application of modeling acoustic waves propagation in a carbon fiber reinforced plastic (CFRP) plates for
damage detection. This task is a part of non-destructive testing (NDT) methods which are very important in many industry
branches. Propagation of Lamb waves is modeled using three-dimensional finite element method by means of commercial
software. In the paper three different cases of plate structures with and without flaws are considered to present review of selected
methods for the detection of defects in time and frequency domain. These are comparisons of: A-scans, B-scans, dispersion
curves, spectrograms, scalograms and energy plots. Developed numerical model first has been validated by means of analytical
solution for isotropic plate.
Keywords: Lamb waves, non-destructive testing, finite element method, damage detection
This document discusses using Lamb waves and 3D laser vibrometry to detect fatigue cracks in metallic structures. Specifically, it describes generating Lamb waves with a piezoceramic transducer and sensing the waves' vibration patterns with a laser vibrometer. An experiment was conducted where a fatigue crack was introduced into an aluminum plate. Lamb waves were then used to detect the crack, demonstrating this method's potential for non-destructive testing of metallic structures.
Neutron Imaging and Tomography with Medipix2 and Dental Microroentgenography:...IJAEMSJORNAL
This document provides an overview of neutron imaging and tomography using the Medipix2 semiconductor detector and dental microroentgenography. Medipix2 allows high resolution digital imaging of photons, electrons and neutrons. Experiments imaged a relay, bullet cartridge, tooth and thread using neutron sources and Medipix2. Neutron tomography reconstructed 3D models from 100 projections. Dental microroentgenography used Medipix2 for high resolution dental x-rays. Medipix2 provides portable, high resolution imaging for applications like analyzing bone-implant interfaces.
Image processing techniques applied for pitting corrosion analysiseSAT Journals
Abstract
In order to study the behavior of the early stage of pitting corrosion, an image analysis based on discrete wavelet packet transform
and fractals was used. Image feature parameters were extracted and analyzed to characterize the pitting corrosion development with
test time. It was found that the feature parameters: Shannon entropy, energy, fractal dimension and intercept increased with the test
time. Therefore the image processing techniques were promising and effective tools to analyze and detect the pitting corrosion.
Keywords: corrosion, pitting corrosion, surface topography, surface analysis, carbon steel, tap water
Computations of Acoustic Wave Propagation in II-VI Hexagonal Semiconductor Compounds
Original Research Article
Journal of Chemistry and Materials Research Vol. 1 (3), 2014, 65–70
Pramod Kumar Yadawa *
Synchrotron X-ray topography (SXRT) is a non-destructive method for studying crystalline materials like defects and strain fields within crystals. Using a white beam for SXRT provides benefits such as not requiring sample orientation, recording multiple reflections simultaneously, visualizing all crystal parts at once with good resolution. X-ray diffraction is also non-destructive and provides information on chemical composition and crystal structure of materials through Bragg's law relating wavelength and diffraction angle. Section mode SXRT imaging is essential to avoid sample heating from large beams and allow separation of cap and substrate images for future reconstruction of MEMS structures. CdTe samples showed high quality with some scratches and inclusions observed.
Mobility dependence of the temperature during of the growth
Original Research Article
Journal of Chemistry and Materials Research Vol. 1 (3), 2014, 56–59
Zehor Allam *, Abdelkader Hamdoune, Chahrazed Boudaoud, Aicha Soufi
This curriculum vitae outlines the educational and professional experiences of Dr. Felice Pignatiello. They include a Master's degree in laser spectroscopy, work developing laser systems for printing applications, and project management. Their roles have involved the development of laser technologies, including low power lasers for computer-to-plate applications and high power lasers. They have also conducted research on laser spectroscopy and optical sensing techniques. Currently, they work on optoelectronic projects for printing and collaborate on a project using UV illumination for medical applications.
Dr. Gernot S. Pomrenke presents an overview of his program, Photonics and Optoelectronics, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Final_41817_In situ and real time x-ray computed tomography _2015VJMehul Pancholi
This document discusses using in situ x-ray computed tomography to study the failure mechanisms of carbon fiber reinforced polymer (CFRP) composite flexible risers used in the oil and gas industry. Small diameter CFRP test rings were compressed and scanned using x-ray CT at increasing loads and finer time steps to capture crack initiation and propagation. Global finite element modeling was also performed to study wave loading on flexible pipes. Results from the x-ray CT experiments and global modeling were compared to better understand flexible pipe behavior under compressive loading.
Adaptive 3D ray tracing approach for indoor radio signal prediction at 3.5 GHzIJECEIAES
This paper explained an adaptive ray tracing technique in modelling indoor radio wave propagation. As compared with conventional ray tracing approach, the presented ray tracing approach offers an optimized method to trace the travelling radio signal by introducing flexibility and adaptive features in ray launching algorithm in modelling the radio wave for indoor scenarios. The simulation result was compared with measurements data for verification. By analyzing the results, the proposed adaptive technique showed a better improvement in simulation time, power level and coverage in modelling the radio wave propagation for indoor scenario and may benefit in the development of signal propagation simulators for future technologies.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
This document provides a bibliometric analysis of research on electromagnetic wave absorbers from 1990 to 2020. It analyzes over 23,300 documents from the Scopus database to identify trends in publishing output, influential countries/journals, and popular materials. Key findings include that China published the most research, the Journal of Alloys and Compounds was the most productive journal, and graphene and titanium dioxide were the most studied materials. The document aims to map the evolutionary development and trends in electromagnetic wave absorber research through quantitative analysis of the scientific literature.
Nanotechnology Presentation For Electronic Industrytabirsir
Nanoelectronics aims to process, transmit, and store information using properties of matter at the nanoscale that are different from macroscale properties. Relevant length scales are a few nanometers for molecules acting as transistors or memory, and up to 999 nm for quantum dots using electron spin. While microelectronics uses gate sizes as small as 50 nm, it does not qualify as nanoelectronics as it does not exploit new physical properties related to reduced size.
This document summarizes the state of atom probe tomography (APT) as applied to electronic materials. APT allows for 3D atomic-scale imaging and analysis of materials composition with subnanometer spatial resolution and high sensitivity. Specimen preparation, especially using focused ion beam techniques, has enabled APT analysis of a wide range of electronic materials including semiconductor devices. APT provides unique capabilities for characterizing nanoscale structures in electronic materials such as buried interfaces and dopant profiles. The applications of APT to electronic materials are growing rapidly as the technique becomes more widely used.
Similar to A new Compton scattered tomography modality and its application to material non-destructive evaluation (20)
This document describes an automatic safety door lock system for cars that uses infrared sensors and a hydraulic piston to prevent injuries caused by closing car doors. The system uses IR sensors placed along the door and outer panel connected to a microcontroller. When an object is detected between the closing door and outer panel, the sensors transmit a signal to the microcontroller which activates a relay driver to extend the hydraulic piston to stop the door from closing. The system aims to prevent the over 120,000 injuries that occur annually from unexpected car door closings.
Extrusion can be defined as the process of subjecting a material to compression so that it is forced to
flow through an opening of a die and takes the shape of the hole. Multi-hole extrusion is the process of
extruding the products through a die having more than one hole. Multi-hole extrusion increases the production
rate and reduces the cost of production. In this study the ram force has calculated experimentally for single hole
and multi-hole extrusion. The comparison of ram forces between the single hole and multi-hole extrusion
provides the inverse relation between the numbers of holes in a die and ram force. The experimental lengths of
the extruded products through the various holes of multi-hole die are different. It indicates that the flow pattern
is dependent on the material behavior. The micro-hardness test has done for the extruded products of lead
through multi-hole die. It is observed that the hardness of the extruded lead products from the central hole is
found to be more than that of the products extruded from other holes. The study suggests that multi-hole
extrusion can be used for obtaining the extruded products of lead with varying hardness. The micro-structure
study has done for the lead material before and after extrusion. It is observed that the size of grains of lead
material after extrusion is smaller than the original lead.
Analysis of Agile and Multi-Agent Based Process Scheduling Modelirjes
As an answer of long growing frustration of waterfall Software development life cycle concepts,
agile software development concept was evolved in 90’s. The most popular agile methodologies is the Extreme
Programming (XP). Most software companies nowadays aim to produce efficient, flexible and valuable
Software in short time period with minimal costs, and within unstable, changing environments. This complex
problem can be modeled as a multi-agent based system, where agents negotiate resources. Agents can be used to
represent projects and resources. Crucial for the multi-agent based system in project scheduling model, is the
availability of an effective algorithm for prioritizing and scheduling of task. To evaluate the models, simulations
were carried out with real life and several generated data sets. The developed model (Multi-agent based System)
provides an optimized and flexible agile process scheduling and reduces overheads in the software process as it
responds quickly to changing requirements without excessive work in project scheduling.
Effects of Cutting Tool Parameters on Surface Roughnessirjes
This paper presents of the influence on surface roughness of Co28Cr6Mo medical alloy machined
on a CNC lathe based on cutting parameters (rotational speed, feed rate, depth of cut and nose radius).The
influences of cutting parameters have been presented in graphical form for understanding. To achieve the
minimum surface roughness, the optimum values obtained for rpm, feed rate, depth of cut and nose radius were
respectively, 318 rpm, 0,1 mm/rev, 0,7 mm and 0,8 mm. Maximum surface roughness has been revealed the
values obtained for rpm, feed rate, depth of cut and nose radius were respectively, 318 rpm, 0,25 mm/rev, 0,9
mm and 0,4 mm.
Possible limits of accuracy in measurement of fundamental physical constantsirjes
The measurement uncertainties of Fundamental Physical Constants should take into account all
possible and most influencing factors. One from them is the finiteness of the model that causes the existence of
a-priori error. The proposed formula for calculation of this error provides a comparison of its value with the
actual experimental measurement error that cannot be done an arbitrarily small. According to the suggested
approach, the error of the researched Fundamental Physical Constant, measured in conventional field studies,
will always be higher than the error caused by the finite number of dimensional recorded variables of physicalmathematical
models. Examples of practical application of the considered concept for measurement of fine
structure constant, speed of light and Newtonian constant of gravitation are discussed.
Performance Comparison of Energy Detection Based Spectrum Sensing for Cogniti...irjes
With the rapid deployment of new wireless devices and applications, the last decade has witnessed a growing
demand for wireless radio spectrum. However, the policy of fixed spectrum assignment produces a bottleneck for more
efficient spectrum utilization, such that a great portion of the licensed spectrum is severely under-utilized. So the concept of
cognitive radio was introduced to address this issue.The inefficient usage of the limited spectrum necessitates the
development of dynamic spectrum access techniques, where users who have no spectrum licenses, also known as secondary
users, are allowed to use the temporarily unused licensed spectrum. For this purpose we have to know the presence or
absence of primary users for spectrum usage. So spectrums sensing is one of the major requirements of cognitive radio.Many
spectrum sensing techniques have been developed to sense the presence or absence of a licensed user. This paper evaluates
the performance of the energy detection based spectrum sensing technique in noisy and fading environments.The
performance of the energy detection technique will be evaluated by use of Receiver Operating Characteristics (ROC) curves
over additive white Gaussian noise (AWGN) and fading channels.
Comparative Study of Pre-Engineered and Conventional Steel Frames for Differe...irjes
In this paper, the conventional steel frames having triangular Pratt truss as a roofing system of 60 m
length, span 30m and varying bay spacing 4m, 5m and 6m respectively having eaves level for all the portals is at
10m and the EOT crane is supported at the height of 8m from ground level and pre-engineered steel frames of
same dimensions are analyzed and designed for wind zones (wind zone 2, wind zone 3, wind zone 4 and wind
zone 5) by using STAAD Pro V8i. The study deals with the comparative study of both conventional and preengineered
with respect to the amount of structural steel required, reduction in dead load of the structure.
Flip bifurcation and chaos control in discrete-time Prey-predator model irjes
The dynamics of discrete-time prey-predator model are investigated. The result indicates that the
model undergo a flip bifurcation which found by using center manifold theorem and bifurcation theory.
Numerical simulation not only illustrate our results, but also exhibit the complex dynamic behavior, such as the
periodic doubling in period-2, -4 -8, quasi- periodic orbits and chaotic set. Finally, the feedback control method
is used to stabilize chaotic orbits at an unstable interior point.
Energy Awareness and the Role of “Critical Mass” In Smart Citiesirjes
This document proposes a novel analytical model to define a new concept of critical mass in the context of spreading energy awareness in smart cities. The model incorporates centrality measures in both single-layer and multilayer social networks. Simulation results show that including centrality measures and a multilayer approach lowers the critical mass needed to trigger and spread good consumer habits. Specifically, the model calculates critical mass values using eigenvector centrality in single layers and a heterogeneous eigenvector-like centrality in multilayers. Considering network structure and central nodes' influence allows a smaller critical mass to foster diffusion compared to models that do not account for centrality. Extending the analysis to multilayers further reduces critical mass by increasing tie strength between nodes.
A Firefly Algorithm for Optimizing Spur Gear Parameters Under Non-Lubricated ...irjes
Firefly algorithm is one of the emerging evolutionary approaches for complex and non-linear
optimization problems. It is inspired by natural firefly‟s behavior such as movement of fireflies based on
brightness and by overcoming the constraints such as light absorption, obstacles, distance, etc. In this research,
firefly‟s movement had been simulated computationally to identify the best parameters for spur gear pair by
considering the design and manufacturing constraints. The proposed algorithm was tested with the traditional
design parameters and found the results are at par in less computational time by satisfying the constraints.
The Effect of Orientation of Vortex Generators on Aerodynamic Drag Reduction ...irjes
One of the main reasons for the aerodynamic drag in automotive vehicles is the flow separation
near the vehicle’s rear end. To delay this flow separation, vortex generators are used in recent vehicles. The
vortex generators are commonly used in aircrafts to prevent flow separation. Even though vortex generators
themselves create drag, but they also reduce drag by delaying flow separation at downstream. The overall effect
of vortex generators is more beneficial and proved by experimentation. The effect depends on the shape,size and
orientation of vortex generators. Hence optimized shape with proper orientation is essential for getting better
results.This paper presents the effect of vortex generators at different orientation to the flow field and the
mechanism by which these effects takes place.
An Assessment of The Relationship Between The Availability of Financial Resou...irjes
The availability of financial resources is an important element in impacting the success of a planning
process for an effective physical planning. The extent to which however, they are articulated in the process
remained elusive both in scholarly and public discourse. The objective of this study wastherefore, to examine
the extent to which financial resources affect physical planning. In doing so, the study examinedwhether
financial resources were adequate or not to facilitate planning processes in Paidha. According to the study
findings,budget prioritization and ceilings are still a challenge in Paidha Town Council. This is partly due
limited level of knowledge of physical planning among the officials of Paidha Town Council. As a result, there
were no dedicated budget line for routine inspection of physical development plan compliance and enforcement
tools in Paidha. In conclusion, in addressing uncoordinated patterns of physical development that characterize
Uganda‟s urban centres, a critical starting point ought to be the analysis of physical planning process. The
research of this kind is not only significant to other emerging urban centres facing poor a road network,
mushrooming informal settlements and poor social services including poor pattern of residential and commercial
developments but also to all institutions that are involved in planning these towns. Knowing the extent of need
for financial influences in planning may assist local authorities to take the processes of planning seriously which
will help enhance the sustainable development of emerging urban centres including Paidha.
The Choice of Antenatal Care and Delivery Place in Surabaya (Based on Prefere...irjes
This study analyzed factors affecting the utilization of antenatal care and delivery places in Surabaya, Indonesia based on preferences and choice theory. The study found that:
1) Nearly half of women chose healthcare for delivery based on information from others
2) Most women's main criteria for choosing a delivery place was that it was safe, comfortable and cheap
3) The majority of women's primary choice for a delivery place was one that was close, comfortable and cheap
Prediction of the daily global solar irradiance received on a horizontal surf...irjes
This document presents a new approach for predicting the daily global solar irradiance received on a horizontal surface as a function of local daytime and the maximum daily value. An exponential distribution function is suggested and compared to experimental data from several locations. The maximum daily value (qmax) is estimated theoretically in terms of the solar constant adjusted for earth-sun distance variation. Computed values using the new approach show good agreement with experimental data, within 16% error except for some extreme points.
HARMONIC ANALYSIS ASSOCIATED WITH A GENERALIZED BESSEL-STRUVE OPERATOR ON THE...irjes
This document summarizes a research paper that considers a generalized Bessel-Struve operator on the real line. It defines generalized Bessel-Struve and Weyl integral transforms, which are shown to be transmutation operators relating the generalized Bessel-Struve operator to derivatives. These tools are then used to develop a new harmonic analysis associated with the generalized Bessel-Struve operator, including generalized Sonine integral transforms. Key results proven include Paley-Wiener theorems and properties of the various integral transforms.
The Role of Community Participation in Planning Processes of Emerging Urban C...irjes
This document summarizes a research study examining the level of community participation in the physical planning process in Paidha Town, Uganda. The study found that community participation in planning is very low, limited mostly to a few mass meetings. Few community members are actually involved in planning. Even those involved do not understand their rights and roles. Physical planning has not been adequately prioritized or funded. To improve participation, the study recommends involving communities at different administrative levels from villages to the town council, and using a wider range of participatory methods beyond just meetings. Overall, the study finds that community participation in planning is still limited and needs to be strengthened for more sustainable urban development.
Understanding the Concept of Strategic Intentirjes
This document summarizes the concept of strategic intent in strategic management. It begins by discussing the origins and evolution of strategic management from Greek history to modern theories. It then defines strategic intent, comparing various authors' definitions. A key model by Hamel and Prahalad links strategic intent to other strategic components like foresight and core competencies. Strategic intent inspires long-term thinking beyond strategic planning alone. It provides direction and commitment to help organizations shape competitive priorities and capabilities for the future. Chief executives play a critical role in developing strategic intent to guide organizational progress over 10-20 years.
The (R, Q) Control of A Mixture Inventory Model with Backorders and Lost Sale...irjes
This document summarizes an inventory model that considers a mixture of backorders and lost sales when stockouts occur. The model has the following key features:
1) The set-up cost and lead time are controllable variables that can be optimized.
2) Instead of minimizing stockout costs, the model employs a service level constraint to bound the stockout level per cycle.
3) The model is solved using a genetic algorithm approach to find optimal values for ordering quantity, set-up cost, and lead time that minimize total costs while satisfying the service level constraint.
Relation Between Stress And Menstrual Cycle At 18-21 Years Of Ageirjes
The document summarizes a study that examined the relationship between stress and menstrual cycles in Indonesian nursing students ages 18-21. It found:
1) Nearly half (45.5%) of the 132 students studied experienced irregular menstrual cycles.
2) Slightly over half (50.8%) of students reported experiencing stress.
3) There was a significant relationship between stress and irregular menstrual cycles, with stressed students over 4 times more likely to have irregular cycles.
The study concluded that most of the nursing students experienced irregular menstrual cycles and stress, and that stress was strongly correlated with irregular menstrual periods.
Wave Transmission on Submerged Breakwater with Interlocking D-Block Armorirjes
1. The document summarizes a study on wave transmission through a submerged breakwater with interlocking D-block armor. Laboratory experiments were conducted to determine how water depth, wave period, structure height, and wave steepness influence the transmission coefficient.
2. Regression analysis showed that transmission coefficient (Kt) is most influenced by the ratio of wave length to top width, ratio of structure height to water depth, and ratio of wave height to wave period squared. A formula for Kt in terms of these parameters was developed.
3. Comparisons with previous studies show the same trend that higher wave steepness results in lower transmission coefficient, validating the results. The study provides useful insights into breakwater design using inter
GraphRAG for Life Science to increase LLM accuracyTomaz Bratanic
GraphRAG for life science domain, where you retriever information from biomedical knowledge graphs using LLMs to increase the accuracy and performance of generated answers
Monitoring and Managing Anomaly Detection on OpenShift.pdfTosin Akinosho
Monitoring and Managing Anomaly Detection on OpenShift
Overview
Dive into the world of anomaly detection on edge devices with our comprehensive hands-on tutorial. This SlideShare presentation will guide you through the entire process, from data collection and model training to edge deployment and real-time monitoring. Perfect for those looking to implement robust anomaly detection systems on resource-constrained IoT/edge devices.
Key Topics Covered
1. Introduction to Anomaly Detection
- Understand the fundamentals of anomaly detection and its importance in identifying unusual behavior or failures in systems.
2. Understanding Edge (IoT)
- Learn about edge computing and IoT, and how they enable real-time data processing and decision-making at the source.
3. What is ArgoCD?
- Discover ArgoCD, a declarative, GitOps continuous delivery tool for Kubernetes, and its role in deploying applications on edge devices.
4. Deployment Using ArgoCD for Edge Devices
- Step-by-step guide on deploying anomaly detection models on edge devices using ArgoCD.
5. Introduction to Apache Kafka and S3
- Explore Apache Kafka for real-time data streaming and Amazon S3 for scalable storage solutions.
6. Viewing Kafka Messages in the Data Lake
- Learn how to view and analyze Kafka messages stored in a data lake for better insights.
7. What is Prometheus?
- Get to know Prometheus, an open-source monitoring and alerting toolkit, and its application in monitoring edge devices.
8. Monitoring Application Metrics with Prometheus
- Detailed instructions on setting up Prometheus to monitor the performance and health of your anomaly detection system.
9. What is Camel K?
- Introduction to Camel K, a lightweight integration framework built on Apache Camel, designed for Kubernetes.
10. Configuring Camel K Integrations for Data Pipelines
- Learn how to configure Camel K for seamless data pipeline integrations in your anomaly detection workflow.
11. What is a Jupyter Notebook?
- Overview of Jupyter Notebooks, an open-source web application for creating and sharing documents with live code, equations, visualizations, and narrative text.
12. Jupyter Notebooks with Code Examples
- Hands-on examples and code snippets in Jupyter Notebooks to help you implement and test anomaly detection models.
Main news related to the CCS TSI 2023 (2023/1695)Jakub Marek
An English 🇬🇧 translation of a presentation to the speech I gave about the main changes brought by CCS TSI 2023 at the biggest Czech conference on Communications and signalling systems on Railways, which was held in Clarion Hotel Olomouc from 7th to 9th November 2023 (konferenceszt.cz). Attended by around 500 participants and 200 on-line followers.
The original Czech 🇨🇿 version of the presentation can be found here: https://www.slideshare.net/slideshow/hlavni-novinky-souvisejici-s-ccs-tsi-2023-2023-1695/269688092 .
The videorecording (in Czech) from the presentation is available here: https://youtu.be/WzjJWm4IyPk?si=SImb06tuXGb30BEH .
Digital Marketing Trends in 2024 | Guide for Staying AheadWask
https://www.wask.co/ebooks/digital-marketing-trends-in-2024
Feeling lost in the digital marketing whirlwind of 2024? Technology is changing, consumer habits are evolving, and staying ahead of the curve feels like a never-ending pursuit. This e-book is your compass. Dive into actionable insights to handle the complexities of modern marketing. From hyper-personalization to the power of user-generated content, learn how to build long-term relationships with your audience and unlock the secrets to success in the ever-shifting digital landscape.
For the full video of this presentation, please visit: https://www.edge-ai-vision.com/2024/06/building-and-scaling-ai-applications-with-the-nx-ai-manager-a-presentation-from-network-optix/
Robin van Emden, Senior Director of Data Science at Network Optix, presents the “Building and Scaling AI Applications with the Nx AI Manager,” tutorial at the May 2024 Embedded Vision Summit.
In this presentation, van Emden covers the basics of scaling edge AI solutions using the Nx tool kit. He emphasizes the process of developing AI models and deploying them globally. He also showcases the conversion of AI models and the creation of effective edge AI pipelines, with a focus on pre-processing, model conversion, selecting the appropriate inference engine for the target hardware and post-processing.
van Emden shows how Nx can simplify the developer’s life and facilitate a rapid transition from concept to production-ready applications.He provides valuable insights into developing scalable and efficient edge AI solutions, with a strong focus on practical implementation.
Generating privacy-protected synthetic data using Secludy and MilvusZilliz
During this demo, the founders of Secludy will demonstrate how their system utilizes Milvus to store and manipulate embeddings for generating privacy-protected synthetic data. Their approach not only maintains the confidentiality of the original data but also enhances the utility and scalability of LLMs under privacy constraints. Attendees, including machine learning engineers, data scientists, and data managers, will witness first-hand how Secludy's integration with Milvus empowers organizations to harness the power of LLMs securely and efficiently.
Have you ever been confused by the myriad of choices offered by AWS for hosting a website or an API?
Lambda, Elastic Beanstalk, Lightsail, Amplify, S3 (and more!) can each host websites + APIs. But which one should we choose?
Which one is cheapest? Which one is fastest? Which one will scale to meet our needs?
Join me in this session as we dive into each AWS hosting service to determine which one is best for your scenario and explain why!
Taking AI to the Next Level in Manufacturing.pdfssuserfac0301
Read Taking AI to the Next Level in Manufacturing to gain insights on AI adoption in the manufacturing industry, such as:
1. How quickly AI is being implemented in manufacturing.
2. Which barriers stand in the way of AI adoption.
3. How data quality and governance form the backbone of AI.
4. Organizational processes and structures that may inhibit effective AI adoption.
6. Ideas and approaches to help build your organization's AI strategy.
Project Management Semester Long Project - Acuityjpupo2018
Acuity is an innovative learning app designed to transform the way you engage with knowledge. Powered by AI technology, Acuity takes complex topics and distills them into concise, interactive summaries that are easy to read & understand. Whether you're exploring the depths of quantum mechanics or seeking insight into historical events, Acuity provides the key information you need without the burden of lengthy texts.
Webinar: Designing a schema for a Data WarehouseFederico Razzoli
Are you new to data warehouses (DWH)? Do you need to check whether your data warehouse follows the best practices for a good design? In both cases, this webinar is for you.
A data warehouse is a central relational database that contains all measurements about a business or an organisation. This data comes from a variety of heterogeneous data sources, which includes databases of any type that back the applications used by the company, data files exported by some applications, or APIs provided by internal or external services.
But designing a data warehouse correctly is a hard task, which requires gathering information about the business processes that need to be analysed in the first place. These processes must be translated into so-called star schemas, which means, denormalised databases where each table represents a dimension or facts.
We will discuss these topics:
- How to gather information about a business;
- Understanding dictionaries and how to identify business entities;
- Dimensions and facts;
- Setting a table granularity;
- Types of facts;
- Types of dimensions;
- Snowflakes and how to avoid them;
- Expanding existing dimensions and facts.
HCL Notes and Domino License Cost Reduction in the World of DLAUpanagenda
Webinar Recording: https://www.panagenda.com/webinars/hcl-notes-and-domino-license-cost-reduction-in-the-world-of-dlau/
The introduction of DLAU and the CCB & CCX licensing model caused quite a stir in the HCL community. As a Notes and Domino customer, you may have faced challenges with unexpected user counts and license costs. You probably have questions on how this new licensing approach works and how to benefit from it. Most importantly, you likely have budget constraints and want to save money where possible. Don’t worry, we can help with all of this!
We’ll show you how to fix common misconfigurations that cause higher-than-expected user counts, and how to identify accounts which you can deactivate to save money. There are also frequent patterns that can cause unnecessary cost, like using a person document instead of a mail-in for shared mailboxes. We’ll provide examples and solutions for those as well. And naturally we’ll explain the new licensing model.
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A new Compton scattered tomography modality and its application to material non-destructive evaluation
1. International Refereed Journal of Engineering and Science (IRJES)
ISSN (Online) XXXX-XXXX, (Print) XXXX-XXXX
Volume X, Issue X (XXXXX 2014), PP.
A new Compton scattered tomography modality and its
application to material non-destructive evaluation
mai.nguyen-verger@u-cergy.fr
E.R. Lopez-Villaverde 1
, S. -N. Vu1
, M. K. Nguyen 1
, A. Noumowe2
1(
Equipes Traitement de l'Information et Systèmes (ETIS) / ENSA/Université de Cergy-Pontoise/UMR CNRS
8051/, F-95302 Cergy-Pontoise, France)
2(
Laboratoire de Mécanique et Matériaux du Génie Civil(L2MGC) EA 4114/ Université de Cergy-Pontoise,
F-95000 Cergy-Pontoise, France)
I. INTRODUCTION
In medicine, hidden structures of objects are routinely revealed by ultrasound imaging and radiation
tomography, which comprises three modalities: transmission, emission and scattering. In material sciences, in
addition of these, many more technological imaging processes are available, such as magnetic flux leakage,
eddy current, infrared and thermal testing, Radar technology, etc.). However these methods although less costly
and easy to operate lack accuracy and cannot deliver key physical quantities necessary for material evaluation.
In this respect, radiation imaging, despite stringent safety restrictions, is more reliable in bringing accurate data
on relevant physical quantities. This is the reason why many medical tomographic imaging modalities have been
in transferred to non-destructive evaluation systematically.
Although transmission radiation imaging (tomography) has been in operation for a long time, it has
been realized that there is a need to determine other physical parameters than the ones deduced from the
absorption of radiation in matter. Moreover working with the propagation of radiation through matter,
conventional transmission imaging cannot handle some large objects or objects that are improper to be inserted
in an industrial tomograph. Transmission imaging provides line-integrated information along the radiation
propagation path, which masks the position of an anomaly present along the line. Therefore, it is difficult,
among other things, to determine the position of this anomaly from the transmission data.
Thus the need to remedy to that situation has led workers to propose the use of radiation scattering
imaging. By recording the amount of deflected radiation from the object, any anomaly will not be hidden in the
integrated data. Scattering also eliminates the need of accessing the target object from two opposing sides.
Therefore, since both source and detector can be placed on one side of the object, examination of extended
structures becomes possible. Pioneering works, done in recent years, have confirmed these advantages in non-
destructive evaluation of industrial objects and materials.
www.irjes.com 1 | Page
Abstract:- Imaging modalities exploiting the use of Compton scattering are currently under active
investigation. However, despite many innovative contributions, this topic still poses a formidable mathematical
and technical challenge. Due to the very particular nature of the Compton effect, the main problem consists of
obtaining the reconstruction of the object electron density. Investigations on Compton scatter imaging for
biological tissues, organs and the like have been performed and studied widely over the years. However in
material sciences, in particular in non-destructive evaluation and control, this type of imaging procedure is just at
its beginning. In this paper, we present a new scanning process which collects scattered radiation to reconstruct
the internal electronic distribution of industrial materials. As an illustration, we shall look at one of the most
widely used construction material: concrete and its variants in civil engineering. The Compton scattered
radiation approach is particularly efficient in imaging steel frame and voids imbedded in bulk concrete objects.
We present numerical simulation results to demonstrate the viability and performances of this imaging modality.
Keywords :- Compton scattering , Gamma-ray imaging , Non-destructive testing/evaluation (NDT/NDE),
Concrete: structure and defects, Radon transform
2. International Refereed Journal of Engineering and Science (IRJES)
ISSN (Online) XXXX-XXXX, (Print) XXXX-XXXX
Volume X, Issue X (XXXXX 2014), PP.
One of the most widely used industrial material is concrete. It enters a large variety of objects in civil
engineering. Therefore the monitoring of its status in time becomes of primary concern for safety and
maintenance. What is needed is a non-destructive evaluation (NDE) or a non-destructive testing (NDT) of its
status which could provide images of its interior, so as to see and determine anomalies ad their time evolution
[1,2]. The most common defects are internal cracks, voids, shallow delamination, honeycombing and surface
opening cracks. They are the factors that affect most the durability of concrete. In the case of reinforced
concrete structures, other defects such as thickness variations, deteriorated zones, corroded reinforcing bars, see
e.g. [3,4] and moisture may occur. Imaging of concrete structures is very important because it reveals aging and
deterioration of infrastructures, as pointed out by [5]. Hence their detection is of utmost importance in order to
prevent material failure which leads to accidents. Common detection techniques using ultra-sounds or
radiography generally provide only qualitative information. Infrared thermography, radar and acoustic imaging
are also applied but with coarser resolution. Radiography can be used to locate internal defects and reinforced
re-bars position in concrete and general condition through differences in radiation intensity passing through the
structure that is captured on photographic film placed on the opposite side of the structure from the source, see
[6,7,8]. Computerized Tomography (CT) is a method that permits the development of three-dimensional
radiograph views of an object. The degree of damage in concrete structures can be assessed using high
resolution three-dimensional images obtained from this CT technique [9]. However the performances of CT
have limitations as pointed out earlier. They may be overcome by scattered radiation imaging which also brings
about useful complementary information.
Since gamma rays from radioactive isotopes have sharply defined energies, the analysis of the detected
scattered signal is easier. Moreover, gamma-ray isotopic sources are readily portable, self-contained an usable in
hostile environments. The most common modality in scattered radiation imaging proposed so far is a step by
step procedure. It consists in determining the electron density at a site by measuring the deflected amount of
radiation by Compton effect by a fixed scattering angle, given an incoming calibrated amount of incident
radiation. This procedure has been tested and shown to be viable over the years. However it is time consuming
and not very practical, although it enables the detection of local defects and the discrimination between
materials of different density such as void and steel in concrete. We propose an alternative modality whereby
data acquisition is continuous: the detector is set to absorb only scattered radiation of given energy and the pair
source-detector, set at a constant distance from each other, rotates around its middle point in a plane. Thus one
gets an integrated data along various circular arcs of the electron density. The reconstruction of this density is
shown to be possible thanks to an analytic inversion method, derived recently from that of A M Cormack for the
transmission scanning modality of computerized tomography (CT) [24].
In this work, we describe this Compton scatter imaging modality. This gamma scattering tomography
resolves some of the problems encountered in radiography and CT. A detailed comparison of these two
techniques can be found in [9]. Since the sought quantity is the electron density of matter, Compton scatter
imaging is particularly efficient in the detection and imaging of voids and steel rebars in concrete because of
large discontinuities in traversing these defects. Moreover in concrete bulk a change in water content, which is
due to higher porosity, may be also seen in variations of measured electron density. This may indicate a change
in mechanical properties of concrete via a change of its compression Young modulus. Thus the knowledge of an
electron density map for concrete may be extremely relevant for nondestructive evaluation. This quantity is
becoming the focus of attention in recent years [10,11].
www.irjes.com 2 | Page
3. International Refereed Journal of Engineering and Science (IRJES)
ISSN (Online) XXXX-XXXX, (Print) XXXX-XXXX
Volume X, Issue X (XXXXX 2014), PP.
Up to now the most currently used method is the point-wise scanning, by which information can be
obtained by focusing the field of view of the source and detector around a scattering volume. Then the measured
scattered signal allows the determination of the density of the material. The disadvantages are relatively poor
resolution, slow scanning speed and difficulties associated with numerical reconstruction of object’s internal
characteristics. The scattered signal is also affected by the attenuation of both incident and scattered photons
which makes the reconstruction difficult. Collimation of the initial and scattered radiation allows the detection
of relatively few scattered photons, and this is the reason why the statistics relative to this process are very poor,
see [12,13]. Finally by scanning through a plane of interest within an object using raster motion, one may obtain
density distribution in a whole plane.
Here we propose a different imaging approach by scattering of ionizing radiation. Previous work on the
use of scattered radiation has originated from medical imaging but this idea has made quick headway to NDT
and NDE through many proposals such as [14]. To generate scattering tomography at high resolution one
follows the idea of Kondic by installing wide-angle collimated source and detector, see [15]. This allows
counting almost all of the scattered photons leaving the object in the direction of the detector. Moreover to get
the necessary complete data we must allow for the rotation of the pair source-detector around the object. In fact
this was already foreseen long ago by [16] and [17]. But at this time no analytic inversion formula was available
and numerical inversion of data has led to poor reconstruction results. Our proposal differs from that of [18,19],
as well as [20,21,22,23], since in their scanning procedure, the detector runs along a line passing through the
source which is not very convenient for practical operations except in the case of large flat structures. Of course
their image reconstruction is based on a different approach. The recent derivation of the reconstruction formula
for the electron density has prompted applications in medical imaging [26]. We propose now an application in
non-destructive evaluation of concrete as an alternative to existing NDE methods. In section 2 we describe the
new Compton scatter tomography modality, with image formation as well as image reconstruction. Then in the
next section 3 we discuss the corresponding simulation results. Conclusion and possible future perspectives are
given in the last section.
II A COMPTON SCATTER TOMOGRAPHY MODALITY
The principle of this imaging modality is simple: it makes use of the Compton effect or scattering of ionizing
radiation by an electron. Fig. 1 briefly recalls the mechanism of Compton scattering. An incident X or gamma
radiation of energy E0 hits an electron at rest and is deflected from the initial direction of motion by an angle ω.
The scattered radiation (or photon) carries the energy E0 given by the famous Compton relation
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4. International Refereed Journal of Engineering and Science (IRJES)
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Volume X, Issue X (XXXXX 2014), PP.
(1)
where mc2
is the rest energy of the electron or 0,511 MeV.
1) Image formation and circular arc Radon transform.
Fig. 2 shows how data acquisition is performed in this new Compton scattering tomography modality.
Test objects under study are put inside a circular frame and are illuminated by an isotropic radiation source S of
definite energy E0 situated on the circular frame. A radiation detector at site D, diametrically opposite to S via a
multichannel analyzer registers scattered radiation at scattered energy Eω. From the known kinematics of
Compton scattering, the radiation amount collected by a unit surface of detector per unit time is proportional to
the integral of the object (concrete) electron density along a circular arc joining the point source site S to the
detector site D, the circular arc subtending the angle (π-ω), for details see [24]. We denote the sought electron
density by f(r,θ) which describes the inner state of the object. The line SD has a length 2p and rotates around its
center O during scanning, the rotation state of the apparatus being conveniently labeled by the angle φ. The
detected radiation flux density at D is Cf(φ,ω) and given by the integral of f(r,θ) on the circular arc C(φ,ω) up to
a factor representing the Compton scattering phenomena (this factor is absorbed in the definition of f(r,θ) for
simplicity)
(2)
where ds is the arc integration element, computed from the arc equation
(3)
with τ = cotan ω and γ = π – ω. Note that for ω = 0, the circular arc reduces to a line, and the detector
receives non scattered radiation, which is to be excluded
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5. International Refereed Journal of Engineering and Science (IRJES)
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The set of all integrals Cf(φ,ω) represents what is called the circular arc Radon transform of the object
electron density f(r,θ) . It is a function of two angular variables (φ,ω)
(4)
Remark The electronic density of a material is in fact given by the formula
(5)
where ρ is the mass density , NA=6.022x1023
mol-1
is the Avogadro number, A the mass number and Z
the atomic number.
2) Reconstruction of the electronic density
The inverse formula of equation (4) has been worked out in [24]. Hereafter we give a short account of its
derivation. Let us introduce the angular Fourier components of f(r,θ)
(6)
The angular Fourier components of Cf(φ,ω) are similarly defined. Then equation (4) is transformed into the
following integral equation for the Fourier angular components Cfl(τ)) and fl(r)
(7)
where τ = cotan ω. To extract the sought components fl(r) we use the method of [25] and get
(8)
where q= 1/τ. Another change of variable in equation (8) leads to the final result
(9)
Finally f(r,θ) is reobtained by summing over its angular components fl(r) according to equation (6).
III. SIMULATION RESULTS
Concrete is an interesting test material for this new investigation method. Let us recall how it behaves under
standard non-destructive evaluation using standard radiation attenuation method. Here the mathematical tool is
of course the classical Radon transform. What is reconstructed is the attenuation map of the material. By using a
careful pixel thresholding of the attenuation image, it is possible to deduce the porosity of the concrete sample.
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6. International Refereed Journal of Engineering and Science (IRJES)
ISSN (Online) XXXX-XXXX, (Print) XXXX-XXXX
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This would yield, through the Féret formula, its compression limit and elasticity modulus. So long as the found
numerical values are acceptable, the state of the investigated material can be declared safe for further use. It is
expected that the reconstructed electron density would lead to similar conclusions and thereby complement the
information obtained from the attenuation map.
Simulations are performed using a synthetic image of the reinforced concrete with iron grid. The
original concrete electron density is given in Fig. 3. For simplicity, the pixel intensity is normalized. It is to be
noted that iron grid holds the highest electron density and the lowest electron density is located in the empty
spaces. The acquired data is given in Fig. 4 in the coordinate system (φ,ω). Using equation (9) and the previous
data the reconstructed concrete electron density is given in Fig. 5. This reconstruction procedure is recent and
need to be perfected. The results are however convincing. The Mean Quadratic Error is 0.5266%. The image is
that of a reinforced concrete with iron grid.
Another series of simulations are performed on a crack inside a concrete piece. The results are
presented in Figs. 6, 7 and 8 with the same image quality.
An analysis of concrete properties can be carried out in the same way as in X-ray CT. Here a notable
advantage resides in the fact that large doses of radiation are not needed due to a better confinement of radiation.
Moreover this scanning modality can be used on small objects in civil engineering. For large objects the
modality advocated by [18] is appropriate since the scanning by scattered radiation is done only on one side of
the object. However it presents an inconvenient displacement of the detector along a line passing through the
source. There is a possibility of using Compton scattering at angles larger than π/2 with the present modality
to scan the half space of a large object. This has been already pointed out in [26].
IV. CONCLUSION AND PRSPECTIVES
We have presented in this work a new NDT/NDE modality based the phenomena of Compton scattering by
gamma rays produced by radioactive isotopes. The use of gamma radiation allows to get an excellent spatial
resolution as it is able to penetrate deeply in bulk material, hence perfectly adapted to concrete. As there exists
no universal NDT/NDE method, capable of providing all interesting parameters, our proposal provides
complementary information to the existing ones via the reconstruction of matter electron density. In this way,
the porosity of concrete can be located and evaluated, so that resistance to compression, elasticity modulus and
permeability of concrete can be deduced. This method has the advantage that it need not to be in physical
contact with the object to be investigated such as the geo-radar. It gives very convincing simulation results and
stands as a valid competitor for current methods of NDT/NDE. It is evident that not all the properties of this
Compton scatter tomography have been exploited. A major challenge is this research is the problem posed by
radiation attenuation. The way attenuation comes into the problem differs from that of the known classical
Radon transform. It leads to a very cumbersome inversion problem for which there is no solution at present.
However one may proceed by performing attenuation corrections, which have turned out to be very successful
in recent studies, see [27]. Efforts in this direction will be dispatched in the future.
ACKNOWLEDGEMENTS
The authors would like to thank the “Fondation de l’Université de Cergy-Pontoise”- France for financial support
to this work.
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[27] Rigaud G, Régnier R, Nguyen M K, New bimodal scattered radiation tomographic imaging with
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