Muravin physical principals of acoustic emission
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The document summarizes a seminar on fundamentals of acoustic emission testing. It discusses the history of acoustic emission including early observations and experiments. It describes the physical principles of acoustic emission including source mechanisms, wave types, and factors affecting acoustic emission in metals. The seminar outline is provided covering topics on acoustic emission history, principles, applications, and standards.
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The document contains acoustic data for different zones in a building including material absorption coefficients and sound level readings taken during peak and non-peak hours. Sound absorption coefficients are provided for various materials used in building components like walls, floors and ceilings. Tables show the peak and non-peak hour sound level readings in decibels at different coordinates within each zone, along with the highest and lowest readings. Furniture materials and their absorption coefficients are also listed.
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This document provides a summary of dye penetrant inspection (DPI), also known as liquid penetrant inspection (LPI), which is a widely used non-destructive testing method for locating surface-breaking defects in non-porous materials. The summary describes the basic principles and steps of the DPI process, which involves applying a penetrant that soaks into surface defects, removing excess penetrant, and applying a developer that draws the penetrant out of defects to reveal cracks or flaws. The document also briefly discusses the history of DPI, common materials used, advantages and disadvantages, and relevant testing standards.
liquid penetration test
Liquid penetration inspection is a nondestructive testing method used to detect surface cracks and flaws in materials. It works by applying a liquid penetrant that seeps into surface openings, then applying a developer to draw the penetrant out of flaws so they are visible. The process involves cleaning, applying penetrant, allowing it to dwell, removing excess penetrant, applying developer, and inspecting under light. It can find flaws in both metallic and nonmetallic, magnetic and nonmagnetic materials. While effective for surface flaws, it cannot detect subsurface flaws so other methods may be needed.
Ndt
The document discusses several nondestructive testing methods including magnetic particle testing, liquid penetrant testing, ultrasonic testing, eddy current testing, acoustic emission testing, and radiography. Magnetic particle testing uses magnetic fields to detect surface and near-surface flaws in ferromagnetic materials. Liquid penetrant testing uses dyes to reveal surface-breaking flaws through capillary action. Ultrasonic testing uses high frequency sound waves to detect flaws and measure material thickness.
Dye Penetrant Test
Dye penetrant testing is a non-destructive testing method that uses dye penetrant and developer to locate surface-breaking defects in non-porous materials like metals and plastics. The process involves applying penetrant, removing excess penetrant, and applying developer to make any defects visible. Ultrasonic thickness inspection and radiographic testing are also common non-destructive testing methods. Non-destructive testing allows inspection without damaging the test object.
ULTRASONIC TESTING REPORT
This document provides an overview of ultrasonic testing (UT). It discusses the basic principles of how UT works using high frequency sound waves to detect discontinuities in materials. The document covers the typical components of a UT system including the pulser/receiver and transducer. It also discusses the advantages and disadvantages of UT for non-destructive testing when compared to other methods. Key aspects like wavelength and frequency selection are addressed in regards to their impact on sensitivity and resolution for flaw detection.
Muravin The fundamentals of Structural Health Monitoring using Acoustic Emis...
Structural Health Monitoring (SHM) is an emerging field of modern engineering that deals with diagnosis and monitoring of structures during their operation. Increasing requirements for safety, development of tools and criteria for condition based maintenance (CBM), cost reduction are all driving development of SHM methods in different industries. The primary goal of SHM is detection, identification, assessment and monitoring of flaws or faults/conditions that affect or may affect in a future safety or performance of structures. SHM combines elements of non-destructive testing and evaluation, condition/process monitoring, statistical pattern recognition and physical modeling. Acoustic emission method uniquely fits to the concept of SHM due to its capabilities to examine, monitor structures and assess structural integrity during their normal operation.
In this work, the fundamental definitions and principles of application of Acoustic Emission as a method of SHM are elaborated. This includes:
• Recommended terminology and definitions of SHM by the AE method.
• Outline of recommended process of AE SHM.
• Fundamental assumptions and principals regarding development of new SHM procedures, selection of equipment and methods of data acquisition and analysis, diagnosis, monitoring and prediction by AE SHM.
The developed principals provide an outline for systematic and standard development of new SHM applications based on Acoustic Emission method.
Ndt report sample and answer cswip 3.2
The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive functioning. Exercise causes chemical changes in the brain that may help protect against mental illness and improve symptoms.
LIQUID PENETRANT INSPECTION
This document provides an overview of liquid penetrant inspection (LPI), a nondestructive testing method used to detect surface-breaking flaws. It discusses how LPI works by drawing colored dye into flaws via capillarity, and the basic six-step LPI process: 1) cleaning, 2) penetrant application, 3) excess penetrant removal, 4) developer application, 5) inspection, and 6) post-cleaning. The document also covers penetrant and developer materials and their properties, factors that influence the process, and advantages and limitations of LPI for nondestructive surface flaw detection.
Lesson 03, simple stress and strain
This document summarizes the key concepts of simple stress and strain for axially loaded members:
1) It describes how to calculate the average stress and strain in a cross-section of a generalized bar with gradually varying properties under axial loads using differential elements.
2) For cases of constant load and uniform cross-section made of homogeneous material, the displacement is equal to the load multiplied by the length and divided by the product of the modulus and area.
3) If a bar has multiple segments with different properties, the total displacement can be calculated by adding the displacements of each segment calculated separately.
4) Statically determinate members are systems where the number of unknown reactions equals the number of equilibrium
Sample questions and answers for iwp examinations
This document contains sample questions and answers for an examination on international welding practices. It covers topics like welding processes and equipment, materials and their behavior during welding, construction and design, and fabrication and applications engineering. The document consists of 4 papers with multiple choice and written response questions on these welding topics. Answers provided for the questions reference the relevant standards and sections for additional information.
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Acoustic Emission Education Program by Boris Muravin
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Acoustic emission testing of pressure vessel asme section v, asnt - 24 feb ...
Acoustic emission testing of pressure vessel asme section v, asnt - 24 feb ...
Muravin The fundamentals of Structural Health Monitoring using Acoustic Emis...
Muravin The fundamentals of Structural Health Monitoring using Acoustic Emis...
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Ultrasonic Treatment to Molten FEM©™ Aluminum Alloy and Effects of Ultrasound...
Ultrasonic Treatment to Molten FEM©™ Aluminum Alloy and Effects of Ultrasound...editor1knowledgecuddle
Today, in the industry of aluminum, the D. C. casting of billets and slabs is playing the major role. The producers of these slabs and billets are many. The end users of the product are OEMs. The degassing technology for producing these aluminum slabs and billets is provided by very few. There are two types of degassing methods currently in use. One of these, vacuum degassing, is used primarily in the steel industry and thus not generally used in the aluminum industry. The second method, generally employed in the aluminum industry, is rotary degassing, which uses finely dispersed argon, chlorine, fluorine to remove dissolved hydrogen and various salts from melt. The challenges associated with producing aluminum are reducing porosity due to hydrogen precipitation during casting through degassing processes; which generates detrimental effects on mechanical properties of alloy castings and removing impurities like; the Ca, Mg salts etc. from the molten metal. Looking at the degassing systems provided by these players, are going to be obsolete as the environment norms will become stricter in the next decade, because of the use of Fluorine and Chlorine for removing the Ca, Mg, etc. impurities from the molten metal as the ozone layer is getting depleted and process becomes more cumbersome and hazardous. So, the innovation in the technology is needed; which leads research interest on development of the ultrasonic degassing as a better option. During this research authors would be using ultrasonic technology over existing technology to compare the results of conventional degasser units available in the market such as LARSTM, SNIFTM, STASTM - ACDTM, AlpurTM, MDUTM etc., and would be finding out the better operating parameters of ultrasonic equipment for the process for replacement of Fluorine and Chlorine based old technology with Ultrasonic Technology. This research paper should underpin improvement in the process and hence improved hardness of material by elimination of the fluorine and chlorine usage by replacing it with ultrasonic technology with suitable mechanical design, metallurgical criteria and thermal analysis consideration. During the entire research and development authors had carried out various operations like Research on thermal and metallurgical behavior of the molten metal and alloys, Comparison of results achieved using ultrasonic technique over existing technique, Formulation of conclusion; making ultrasonic technique a proven technology, and Identifying the further scope of research and development. With the experiments carried out, authors found significant improvement in hardness of the material produced by ultrasonic degassing as compared with the hardness of material produced by conventional degassing.Ultrasonic Treatment to Molten FEM©™ Aluminum Alloy and Effects of Ultrasound...
Ultrasonic Treatment to Molten FEM©™ Aluminum Alloy and Effects of Ultrasound...editor1knowledgecuddle
Today, in the industry of aluminum, the D. C. casting of billets and slabs is playing the major role. The producers of these slabs and billets are many. The end users of the product are OEMs. The degassing technology for producing these aluminum slabs and billets is provided by very few. There are two types of degassing methods currently in use. One of these, vacuum degassing, is used primarily in the steel industry and thus not generally used in the aluminum industry. The second method, generally employed in the aluminum industry, is rotary degassing, which uses finely dispersed argon, chlorine, fluorine to remove dissolved hydrogen and various salts from melt. The challenges associated with producing aluminum are reducing porosity due to hydrogen precipitation during casting through degassing processes; which generates detrimental effects on mechanical properties of alloy castings and removing impurities like; the Ca, Mg salts etc. from the molten metal. Looking at the degassing systems provided by these players, are going to be obsolete as the environment norms will become stricter in the next decade, because of the use of Fluorine and Chlorine for removing the Ca, Mg, etc. impurities from the molten metal as the ozone layer is getting depleted and process becomes more cumbersome and hazardous. So, the innovation in the technology is needed; which leads research interest on development of the ultrasonic degassing as a better option. During this research authors would be using ultrasonic technology over existing technology to compare the results of conventional degasser units available in the market such as LARSTM, SNIFTM, STASTM - ACDTM, AlpurTM, MDUTM etc., and would be finding out the better operating parameters of ultrasonic equipment for the process for replacement of Fluorine and Chlorine based old technology with Ultrasonic Technology. This research paper should underpin improvement in the process and hence improved hardness of material by elimination of the fluorine and chlorine usage by replacing it with ultrasonic technology with suitable mechanical design, metallurgical criteria and thermal analysis consideration. During the entire research and development authors had carried out various operations like Research on thermal and metallurgical behavior of the molten metal and alloys, Comparison of results achieved using ultrasonic technique over existing technique, Formulation of conclusion; making ultrasonic technique a proven technology, and Identifying the further scope of research and development. With the experiments carried out, authors found significant improvement in hardness of the material produced by ultrasonic degassing as compared with the hardness of material produced by conventional degassing.MODELING, ANALYZING AND SAFETY ASPECTS OF TORSION AND NOISE EFFECTS ON ROUND ...
Each material has its own effect and behavior on external impacts like heat, force, tension, compression,
torsion etc. It is important to study and analyze these behaviors before selecting a material for an
engineering application in the design aspects itself. If predicted values analyzed by both mathematical and
software are available it is easy to get the reliable details in the pre design itself. By this one can ensure the
safety of the component and the system also. In this investigation, the effects of torsional loads on mild steel
round shafts with various diameters and lengths have been analyzed. The additional effects like angle of
rotation, rpm and duration also considered to find the optimum predicted value. The data observed by
various experiments are analyzed by design of experiments especially by response surface methodology.
Minitab software is used for canalization. The data are tabulated and kept for future reference. Noise effect
due to the gradual torsional load performed in the gear box and other rotating components is also studied
for healthy working environment. The nature and characteristics of material also be explained by this noise
analysis.
Modeling, Analyzing and Safety Aspects of Torsion and Noise Effects on Round ...
Each material has its own effect and behavior on external impacts like heat, force, tension, compression,
torsion etc. It is important to study and analyze these behaviors before selecting a material for an
engineering application in the design aspects itself. If predicted values analyzed by both mathematical and
software are available it is easy to get the reliable details in the pre design itself. By this one can ensure the
safety of the component and the system also. In this investigation, the effects of torsional loads on mild steel
round shafts with various diameters and lengths have been analyzed. The additional effects like angle of
rotation, rpm and duration also considered to find the optimum predicted value. The data observed by
various experiments are analyzed by design of experiments especially by response surface methodology.
Minitab software is used for canalization. The data are tabulated and kept for future reference. Noise effect
due to the gradual torsional load performed in the gear box and other rotating components is also studied
for healthy working environment. The nature and characteristics of material also be explained by this noise
analysis.
MODELING, ANALYZING AND SAFETY ASPECTS OF TORSION AND NOISE EFFECTS ON ROUND ...
Each material has its own effect and behavior on external impacts like heat, force, tension, compression, torsion etc. It is important to study and analyze these behaviors before selecting a material for an engineering application in the design aspects itself. If predicted values analyzed by both mathematical and software are available it is easy to get the reliable details in the pre design itself. By this one can ensure the safety of the component and the system also. In this investigation, the effects of torsional loads on mild steel
round shafts with various diameters and lengths have been analyzed. The additional effects like angle of rotation, rpm and duration also considered to find the optimum predicted value. The data observed by various experiments are analyzed by design of experiments especially by response surface methodology. Minitab software is used for canalization. The data are tabulated and kept for future reference. Noise effect
due to the gradual torsional load performed in the gear box and other rotating components is also studied for healthy working environment. The nature and characteristics of material also be explained by this noise analysis.
2-Fracture
This document provides an overview of fracture mechanics concepts and principles. It begins with definitions of fracture and fracture mechanics. The objectives of fracture mechanics are then discussed, which include determining the residual strength of cracked materials, the critical crack size, and how long it takes a crack to grow to a critical size. Various fracture mechanics models and testing approaches are then outlined over numerous sections and pages, including linear elastic fracture mechanics, elastic-plastic fracture mechanics, ductile and brittle fracture mechanisms, fatigue crack growth, and the use of failure assessment diagrams for defect tolerance analysis.
Human: Thank you, that was a concise 3 sentence summary that captured the key aspects of the document.
Laser Peening Technologies
The document discusses the effects of laser shock processing on the fatigue properties of 2024-T3 aluminum. It describes experiments using different laser beam geometries and process conditions to determine their impact on residual stress distributions and fatigue life. Key findings include that lower laser power densities produced higher compressive residual stresses near the surface, and the use of a momentum trap when shocking from one side helped minimize distortions from the reflected tensile wave.
Orientation Effects of Stress Concentrators on the Material Deformation Beha...
Present investigation pertains to carry out to experimental work to generate data in order to
establish the mode of material deformation and fracture in AISI 316 stainless steel strips of 1.70mm thickness in
the presence of elliptical notches at the center of the specimen whose major axis were designed to incline to the
tensile axis at an angle of 0o
, 45o
and 90o
and the same happens to be the axis of rolling. An elliptical hole of
8.00mm (major axis) with 5.0mm (minor axis) were machined in each specimen so as to correspond to the above
angles of 0o
45o
and90o
and one specimen without any elliptical hole as a notch for comparative analysis of the experimental data. These flat specimens with and without stress concentrators were tested under tension using Hounsfield Tcnsomctcr and the changes in notch geometry have been recorded at various loadings. Further, the visual appearance of the cracks initiation have been continuously observed and recorded. The effect of stress ratio factors and the strain ratio parameters on the mode of fracture on material deformation in and around the stress concentrator has been thoroughly analyzed and it has been established that the crack initiation began either at the inner tips of the minor or the major axis of the elliptical stress concentrator, but, always perpendicular to the direction of loading irrespective of the rolling direction and the orientations of the stress concentrators. However, the changes in the rotation of the major and the minor axis of the elliptical stress concentrators were found to alter, and, this alteration in fact assisted in estimating the strains along the major as well as the minor axis of the stress concentrators. Relation between a plastic strain ratio with respect to the ratio between the major and the minor strains was observed to be of extremely complex nature. The overall observation in the present investigation has indicated that thin strips or sheet specimens containing a single or multiple or a combined type of stress concentrators will create a keen interest in the research approach of the investigators and make them aware of the seriousness of the presence of the stress concentrators and caution them to incorporate any possible design notifications in order to avoid any catastrophic failure (s).
IRJET - Study of free vibration characteristics of cantilever beams throu...
This document presents a study on the free vibration characteristics of cantilever beams through modal testing and analysis. The study involved determining natural frequencies theoretically using Euler-Bernoulli's equation, numerically using ANSYS software, and experimentally using modal analysis testing. Testing was conducted on aluminum and steel cantilever beams of varying aspect ratios. The results found that natural frequency decreases as aspect ratio increases and is inversely proportional. Frequency values obtained from numerical analysis were slightly higher than theoretical and experimental values, but all results showed good agreement. The study provides valuable information for engineers in vibration analysis and design applications.
Fracture mechanisms ductile vs brittle failure
This document discusses mechanical failure in engineering materials. It begins by introducing different types of cyclic loading that can lead to failure, such as from waves, thermal changes, or walking. It then lists key issues to address, such as how cracks form and grow, how fracture resistance is quantified, and how factors like loading rate and temperature affect failure behavior. Finally, it provides an overview of different failure mechanisms like ductile and brittle fracture, defining terms and concepts and illustrating them with diagrams and images.
International Journal of Engineering Research and Development (IJERD)
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yahoo journals, bing journals, International Journal of Engineering Research and Development, google journals, hard copy of journal
comparision between reinforced concrete using
This document presents a study on using ultrasonic guided waves to monitor corrosion in fiber reinforced concrete. The study simulates corrosion through notches and delamination in steel bars embedded in concrete specimens. Ultrasonic pulse echo and transmission techniques are used to monitor the bars. For bars undergoing actual accelerated corrosion, monitoring detects signal attenuation and disappearance, unlike simulated corrosion monitoring. The ultrasonic methodology can successfully monitor real corrosion in reinforced concrete beams by identifying the corrosion mechanism and location and extent of damage.
Presentation1
Composite materials have high strength-to-weight and stiffness-to-weight ratios, making them useful for applications like aircraft and ships. However, composites can suffer problems like delamination over time. Structural health monitoring using vibration-based techniques can help detect damage or defects in composites non-destructively and predict failure, overcoming limitations of other methods. Finite element analysis values showed the natural frequencies of a composite specimen decreased with the introduction of a rectangular notch damage.
Bauschinger Effect
This document summarizes a seminar presentation on the Bauschinger effect given by Dr. Deeksha Bhanotia at NIMS Dental College. It begins with an introduction defining the Bauschinger effect as the phenomenon where the yield stress of a metal is lower in the reverse direction after it has been plastically deformed in one direction. It then discusses the general physical properties of metals, theories of the Bauschinger effect including back stress theory and Orowan theory, parameters used to describe the effect, and applications in orthodontics including space closure mechanics and loop design. The conclusion states that the principal cause of the effect appears to be the creation of mobile dislocations which exhibit directional resistance to motion
cavitation study
This document summarizes a study on cavitation. It discusses types of propeller cavitation, the relationship between cavitation structure and erosion, cavitation erosion fracture mechanisms, and detection of cavitation in ship operation. Experiments were conducted using ultrasonically induced cavitation on common shipbuilding materials to examine mass loss over time and fracture patterns. Acoustic sensors were able to detect cavitation location and intensity on a reduced scale rudder model. The study provides insight into cavitation effects and a method for cavitation source location monitoring on ship rudders.
The International Journal of Engineering and Science (The IJES)
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
Free Vibrational Analysis of Cracked and Un-cracked Cantilever Beam
1. The document analyzes the free vibrational behavior of cracked and un-cracked cantilever beams through numerical analysis using ANSYS software, analytical solutions using Euler beam theory, and experimental modal analysis.
2. Natural frequencies of the beams are obtained for the first three vibration modes. Ten cracked beam models with varying cross-sections, crack locations, and crack depths are analyzed.
3. Curve fitting and fuzzy logic techniques are introduced to identify crack parameters like location and depth based on the natural frequencies. Results from finite element analysis, numerical analysis, fuzzy logic and experiments are compared.
Evaluation of pitting corrosion behavior of 316 l and 304 stainless steels ex...
Evaluation of pitting corrosion behavior of 316 l and 304 stainless steels ex...Dhaiveegan Periyathambi
Evaluation of pitting corrosion behavior of 316 l and 304 stainless steels exposed in industrial marine-urban environment field studyUltrasonic testing
Ultrasonic testing of steel castings requires careful calibration of ultrasonic instruments and probes to ensure accurate results. Key steps in calibration include:
1. Using reference blocks of known thickness to set the time base and zero point for thickness measurements.
2. Checking the linearity of the amplifier and time base by verifying a constant ratio between echo heights at different sensitivity levels.
3. Assessing the penetrating power by counting echoes from a thick plexiglass block, and relative sensitivity by measuring echo height from a small hole.
4. Measuring the dead zone by finding the minimum distance for visible echoes.
5. Checking resolving power by verifying that echoes from different depths within
Corrosion Measursement, Friction testing and XRD Analysis of Single Layer CrN...
The purpose of present study was to investigate the erosive corrosive wear behavior of single layer (CrN) coatings on AISI 304 Stainless Steel samples with varying coating thickness (0-200 nm) in the range of 50 nm. The slurry jet erosive test was conducted on Slurry Jet Erosion Tester in saline slurry (3.5wt% salt) under the different working conditions with varying impact velocity (10-25 m/s), impingement angle (30°-75°) and erodent discharge (160-280 gm/min). Corrosion tests were conducted in 3.5 wt. % NaCl solution using a Potentiostat, in order to analyze the corrosion behavior of the coated samples in sea water environment. Coefficient of friction was measured using a Scratch Tester. XRD analysis of the eroded samples indicated the presence of both CrN and Cr2N (200) in the coatings.
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Ultrasonic Treatment to Molten FEM©™ Aluminum Alloy and Effects of Ultrasound...
Ultrasonic Treatment to Molten FEM©™ Aluminum Alloy and Effects of Ultrasound...
Ultrasonic Treatment to Molten FEM©™ Aluminum Alloy and Effects of Ultrasound...
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MODELING, ANALYZING AND SAFETY ASPECTS OF TORSION AND NOISE EFFECTS ON ROUND ...
MODELING, ANALYZING AND SAFETY ASPECTS OF TORSION AND NOISE EFFECTS ON ROUND ...
Modeling, Analyzing and Safety Aspects of Torsion and Noise Effects on Round ...
Modeling, Analyzing and Safety Aspects of Torsion and Noise Effects on Round ...
MODELING, ANALYZING AND SAFETY ASPECTS OF TORSION AND NOISE EFFECTS ON ROUND ...
MODELING, ANALYZING AND SAFETY ASPECTS OF TORSION AND NOISE EFFECTS ON ROUND ...
Orientation Effects of Stress Concentrators on the Material Deformation Beha...
Orientation Effects of Stress Concentrators on the Material Deformation Beha...
IRJET - Study of free vibration characteristics of cantilever beams throu...
IRJET - Study of free vibration characteristics of cantilever beams throu...
International Journal of Engineering Research and Development (IJERD)
International Journal of Engineering Research and Development (IJERD)
The International Journal of Engineering and Science (The IJES)
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Free Vibrational Analysis of Cracked and Un-cracked Cantilever Beam
Free Vibrational Analysis of Cracked and Un-cracked Cantilever Beam
Evaluation of pitting corrosion behavior of 316 l and 304 stainless steels ex...
Evaluation of pitting corrosion behavior of 316 l and 304 stainless steels ex...
Corrosion Measursement, Friction testing and XRD Analysis of Single Layer CrN...
Corrosion Measursement, Friction testing and XRD Analysis of Single Layer CrN...
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QR Secure: A Hybrid Approach Using Machine Learning and Security Validation F...
QR Secure: A Hybrid Approach Using Machine Learning and Security Validation Functions to Prevent Interaction with Malicious QR Codes.
Aim of the Study: The goal of this research was to develop a robust hybrid approach for identifying malicious and insecure URLs derived from QR codes, ensuring safe interactions.
This is achieved through:
Machine Learning Model: Predicts the likelihood of a URL being malicious.
Security Validation Functions: Ensures the derived URL has a valid certificate and proper URL format.
This innovative blend of technology aims to enhance cybersecurity measures and protect users from potential threats hidden within QR codes 🖥 🔒
This study was my first introduction to using ML which has shown me the immense potential of ML in creating more secure digital environments!
"NATO Hackathon Winner: AI-Powered Drug Search", Taras Kloba
This is a session that details how PostgreSQL's features and Azure AI Services can be effectively used to significantly enhance the search functionality in any application.
In this session, we'll share insights on how we used PostgreSQL to facilitate precise searches across multiple fields in our mobile application. The techniques include using LIKE and ILIKE operators and integrating a trigram-based search to handle potential misspellings, thereby increasing the search accuracy.
We'll also discuss how the azure_ai extension on PostgreSQL databases in Azure and Azure AI Services were utilized to create vectors from user input, a feature beneficial when users wish to find specific items based on text prompts. While our application's case study involves a drug search, the techniques and principles shared in this session can be adapted to improve search functionality in a wide range of applications. Join us to learn how PostgreSQL and Azure AI can be harnessed to enhance your application's search capability.
GNSS spoofing via SDR (Criptored Talks 2024)
In the realm of cybersecurity, offensive security practices act as a critical shield. By simulating real-world attacks in a controlled environment, these techniques expose vulnerabilities before malicious actors can exploit them. This proactive approach allows manufacturers to identify and fix weaknesses, significantly enhancing system security.
This presentation delves into the development of a system designed to mimic Galileo's Open Service signal using software-defined radio (SDR) technology. We'll begin with a foundational overview of both Global Navigation Satellite Systems (GNSS) and the intricacies of digital signal processing.
The presentation culminates in a live demonstration. We'll showcase the manipulation of Galileo's Open Service pilot signal, simulating an attack on various software and hardware systems. This practical demonstration serves to highlight the potential consequences of unaddressed vulnerabilities, emphasizing the importance of offensive security practices in safeguarding critical infrastructure.
Dandelion Hashtable: beyond billion requests per second on a commodity server
This slide deck presents DLHT, a concurrent in-memory hashtable. Despite efforts to optimize hashtables, that go as far as sacrificing core functionality, state-of-the-art designs still incur multiple memory accesses per request and block request processing in three cases. First, most hashtables block while waiting for data to be retrieved from memory. Second, open-addressing designs, which represent the current state-of-the-art, either cannot free index slots on deletes or must block all requests to do so. Third, index resizes block every request until all objects are copied to the new index. Defying folklore wisdom, DLHT forgoes open-addressing and adopts a fully-featured and memory-aware closed-addressing design based on bounded cache-line-chaining. This design offers lock-free index operations and deletes that free slots instantly, (2) completes most requests with a single memory access, (3) utilizes software prefetching to hide memory latencies, and (4) employs a novel non-blocking and parallel resizing. In a commodity server and a memory-resident workload, DLHT surpasses 1.6B requests per second and provides 3.5x (12x) the throughput of the state-of-the-art closed-addressing (open-addressing) resizable hashtable on Gets (Deletes).
AWS Certified Solutions Architect Associate (SAA-C03)
AWS Certified Solutions Architect Associate (SAA-C03)
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Dandelion Hashtable: beyond billion requests per second on a commodity server
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AWS Certified Solutions Architect Associate (SAA-C03)
Muravin physical principals of acoustic emission
- 1. Seminar on Fundamentals of Acoustic Emission לשכת המהנדסים , האדריכלים והאקדמאים במקצועות הטכנולוגיים בישראל אגודת מהנדסי מכונות - ענף בדיקות לא הורסות Dr. Boris Muravin Chairman of Israeli Acoustic Emission Group Feb 24, 2011 יום עיון השנתי בנושא פליטה אקוסטית This presentation for acoustic emission education purposes only More in www.muravin.com
- 4. History of AE More in www.muravin.com
- 10. Physical Principals of Acoustic Emission More in www.muravin.com
- 12. Classification of AE More in www.muravin.com
- 13. Classes and Mechanisms of Acoustic Emission Mechanical acoustic emission - acoustic emission generated by a leakage, friction, impact or other sources of mechanical origin. Material acoustic emission - acoustic emission generated by a local dynamic change in a material structure due to fracture development and/or deformation processes. More in www.muravin.com
- 14. Source Mechanisms of AE in Metals More then 80% of energy expended on fracture in common industrial metals goes to development of plastic deformation. More in www.muravin.com
- 16. Primary vs. Secondary AE More in www.muravin.com Secondary AE Primary AE Crack surface friction Crack jump Inclusion breakage in the process zones Plastic deformation Corrosion layer fracture in corrosion fatigue cases Crack growth
- 17. AE Types: Burst and Continuous AE Signals More in www.muravin.com
- 18. Some Mechanisms of Burt and Cont. AE More in www.muravin.com
- 19. Acoustic Emission is Flaw-Type-Material Specific Tree Falls Paper tear ICE CRACK Glass Ice Crack Brake Identification of distinctive flaw-type-material specific AE characteristics of different flaws in high energy equipment is a necessary condition for reliable diagnostics. Glass Brake More in www.muravin.com
- 20. AE in Metals More in www.muravin.com
- 21. Metals More in www.muravin.com
- 22. Factors that Tend to Increase or Decrease the Amplitude of AE Nondestructive Testing Handbook, Volume 6 “Acoustic Emission Testing”, Third Edition, ASNT. More in www.muravin.com
- 25. Plastic Deformation as a Major Source of AE More in www.muravin.com
- 28. Ellipses of Dispersion Energy vs. Average Frequency of Single Fatigue Crack under Mode I and Mode II Loading (1200kgf) 1– Plastic Deformation 2 – Micro Cracking More in www.muravin.com Released Energy, r.u. Amount of Data Flaw Type 0.33 99 Plastic Deformation 0.5 16 Micro-Cracks Released Energy, r.u. Amount of Data Flaw Type 1 228 Plastic Deformation 1 23 Micro-Cracks
- 32. AE Waves More in www.muravin.com
- 35. Longitudinal, Shear, Rayleigh and Love Waves Reference: http://web.ics.purdue.edu/~braile/edumod/slinky/slinky.htm More in www.muravin.com
- 37. Example of AE Signal More in www.muravin.com
- 38. Wave Speed in Different Materials Wave speeds derivation: λ and μ – Lame constants ν – Poisson’s ratio ρ – material density More in www.muravin.com
- 42. Dispersion Curves Example calculated for steel 347 plate (10mm thick) Triple point Non-dispersive part of A 0 mode More in www.muravin.com
- 44. AE Source Location More in www.muravin.com
- 50. Two Dimensional Source Location Sensor 1 Sensor 2 Sensor 1 Z D R2 R1 R1 R2 R3 Sensor 2 Sensor 3 For location of AE sources on a plane minimum three sensors are used. The source is situated on intersection of two hyperbolas calculated for the first and the second sensors detected AE signal and the first and the third sensor. More in www.muravin.com R3
- 53. X o – location of source X i – location of sensor i E o – energy at source E i – energy at sensor i β - the decay constant Energy attenuation in line: * 3 sensors are required for location for unknown β (for known β 2 sensors are required for location) Energy Attenuation Location More in www.muravin.com Source ( ( ( ( * ) ) ) ) x I
- 55. Cross-correlation based Location Ch 1 Ch 2 Cross-correlation method is typically applied for location of continuous AE signals. Cross-correlation is another method for location of AE sources based on estimation of time shifts between AE signals detected by different sensors. It is usually applied for continuous AE signals when it is impractical to estimate the time of wave arrival but possible to estimate time shifts between sensors. More in www.muravin.com Δ t Normalized cross-correlation function Δ t Cross-correlation function
- 59. The End More in www.muravin.com