This document analyzes the creep behavior of Kevlar 49 cords through mathematical modeling. Experimental creep data for Kevlar 49 is fitted using a rheological model based on Inokuchi's method. The model represents the material as a spring and two Kelvin-Voigt solid elements. The parameters for each element are determined using the mathematical analysis. The model accurately reproduces the long-term creep behavior observed experimentally for the Kevlar 49 cords.
Transient response of delaminated composite shell subjected to low velocity o...University of Glasgow
Transient dynamic response of delaminated composite shell subjected to low velocity oblique impact - a finite element method is proposed and new results are discussed
A thermodynamically consistent model for hysteretic materialsFa-Gung Fan
Based on the second law of thermodynamics, a set of constitutive equations for small deformation of heat conducting, hysteretic materials is proposed. It is shown that the model exhibits elastic-viscoplastic-fluid behavior similar to Bingham's materials. Therefore, it may be a suitable candidate for modeling the mechanical behaviors of materials during melting and/or solidification processes. The corresponding bi-axial and uni-axial force-displacement models are also developed and their properties are discussed. It is shown that the resulting force-displacement relations are similar to those given by the Bouc-Wen Model; however, certain modifications are needed to make the earlier model thermodynamically consistent. Several numerical experiments for the uni-axial and bi-axial models are also presented.
- G. Ahmadi, F.-G. Fan, M. Noori
How Carbon Nanotubes Collapse on Different Ag Surface?ijrap
The collapse and stability of carbon nanotubes (CNTs) on noble metal silver different surfaces were studied
using molecular mechanics and molecular dynamics simulations. From the results, it can be seen that the
CNTs can collapse spontaneously onto different silver surface [(1 0 0), (1 1 0), (1 1 1)] due to the van der
Waals force between them. Furthermore, the CNT collapsing on (1 0 0) and (1 1 1) surface are much easier
than that on (1 1 0) surface. Moreover, the results show that the collapsed CNTs exhibit as linked graphene
ribbons and have the largest area to contact with the Ag surface, which greatly enhances adhesion between
the CNTs and the Ag surface and keeps the system much more stable.
Stability Of Magnetostatic Surface Waves In A Semiconductor-Ferrite-Left-Hand...ijrap
Recently increasing works have been devoted to study and fabricate new artificial materials called
metamaterials or left handed materials. These materials have unusual behavior as they have
simultaneously both negative permittivity and permeability.
In this paper, we investigate the effect of left handed materials and the conductivity of semiconductor
material on the dispersion characteristics of left-handed-ferrite-semiconductor waveguide structure, and
then we discuss the stability of magnetostatic surface waves in the mentioned three waveguide structures by
perturbation method.
Buckling and Pull-In Instability of Multi-Walled Carbon Nanotube Probes Near ...IJERA Editor
In this paper, integration of the power series method and the Padé approximants (PS-Padé) is utilized to study buckling and pull-in instability of multi-walled carbon nanotube (MWCNT) cantilevers in the vicinity of graphite sheets due to intermolecular forces. A hybrid nano-scale continuum model based on the Lennard–Jones potential is used to simulate the Van der Waals forces and evaluate the buckling of MWCNT. A closed form power series, based on the symbolic power series polynomials, is utilized to obtain a series solution for the governing boundary value differential equation of the nanotube. In order to handle the boundary conditions and increasing the accuracy of solution, the symbolic power series are transformed into Padé approximants. The governing differential equation is also solved numerically using the finite difference method. The PS-Padé results are compared with the numerical results and other methods reported in literature. The results obtained by using the PS-Padé approach correspond very well with the numerical results. Furthermore, the detachment length and the minimum gap between MWCNT and the graphite plane as important parameters of engineering designs are computed. It is found that for a fixed gap, the detachment length of a MWCNT can be increased with the increase of the radius, wall thickness and the effective Young modulus of the MWCNT.
Transient response of delaminated composite shell subjected to low velocity o...University of Glasgow
Transient dynamic response of delaminated composite shell subjected to low velocity oblique impact - a finite element method is proposed and new results are discussed
A thermodynamically consistent model for hysteretic materialsFa-Gung Fan
Based on the second law of thermodynamics, a set of constitutive equations for small deformation of heat conducting, hysteretic materials is proposed. It is shown that the model exhibits elastic-viscoplastic-fluid behavior similar to Bingham's materials. Therefore, it may be a suitable candidate for modeling the mechanical behaviors of materials during melting and/or solidification processes. The corresponding bi-axial and uni-axial force-displacement models are also developed and their properties are discussed. It is shown that the resulting force-displacement relations are similar to those given by the Bouc-Wen Model; however, certain modifications are needed to make the earlier model thermodynamically consistent. Several numerical experiments for the uni-axial and bi-axial models are also presented.
- G. Ahmadi, F.-G. Fan, M. Noori
How Carbon Nanotubes Collapse on Different Ag Surface?ijrap
The collapse and stability of carbon nanotubes (CNTs) on noble metal silver different surfaces were studied
using molecular mechanics and molecular dynamics simulations. From the results, it can be seen that the
CNTs can collapse spontaneously onto different silver surface [(1 0 0), (1 1 0), (1 1 1)] due to the van der
Waals force between them. Furthermore, the CNT collapsing on (1 0 0) and (1 1 1) surface are much easier
than that on (1 1 0) surface. Moreover, the results show that the collapsed CNTs exhibit as linked graphene
ribbons and have the largest area to contact with the Ag surface, which greatly enhances adhesion between
the CNTs and the Ag surface and keeps the system much more stable.
Stability Of Magnetostatic Surface Waves In A Semiconductor-Ferrite-Left-Hand...ijrap
Recently increasing works have been devoted to study and fabricate new artificial materials called
metamaterials or left handed materials. These materials have unusual behavior as they have
simultaneously both negative permittivity and permeability.
In this paper, we investigate the effect of left handed materials and the conductivity of semiconductor
material on the dispersion characteristics of left-handed-ferrite-semiconductor waveguide structure, and
then we discuss the stability of magnetostatic surface waves in the mentioned three waveguide structures by
perturbation method.
Buckling and Pull-In Instability of Multi-Walled Carbon Nanotube Probes Near ...IJERA Editor
In this paper, integration of the power series method and the Padé approximants (PS-Padé) is utilized to study buckling and pull-in instability of multi-walled carbon nanotube (MWCNT) cantilevers in the vicinity of graphite sheets due to intermolecular forces. A hybrid nano-scale continuum model based on the Lennard–Jones potential is used to simulate the Van der Waals forces and evaluate the buckling of MWCNT. A closed form power series, based on the symbolic power series polynomials, is utilized to obtain a series solution for the governing boundary value differential equation of the nanotube. In order to handle the boundary conditions and increasing the accuracy of solution, the symbolic power series are transformed into Padé approximants. The governing differential equation is also solved numerically using the finite difference method. The PS-Padé results are compared with the numerical results and other methods reported in literature. The results obtained by using the PS-Padé approach correspond very well with the numerical results. Furthermore, the detachment length and the minimum gap between MWCNT and the graphite plane as important parameters of engineering designs are computed. It is found that for a fixed gap, the detachment length of a MWCNT can be increased with the increase of the radius, wall thickness and the effective Young modulus of the MWCNT.
This talk was presented at the 22nd International conference on Surface Modification Technology, 22-24 September 2008, in Trollhattan, Sweden. It describes some recent computational research work carried out using molecular dynamics methods to calculate physical properties, including viscosity, of liquid nickel over a wide temperature range.
From the Egyptian, Roman to the Victorian era, important engineering structures were built "solid" for strength and durability. Although many such structures have passed the test of time and therefore validate the underlying design philosophy, they may not always represent the most efficient way of utilising materials. Due to the unprecedented pressure on sustainability and global focus on net-zero, using less material for future engineering structures is mandatory. The rise of 3D printing technology provides a timely solution towards creating "hollow" or "porous" structural members, which have the potential to utilise lesser materials compared to their equivalent solid counterparts. However, the mechanical behaviour of such hollow structures must be understood well and subsequently. They need to be designed carefully to withstand static and dynamic loads to be experienced during their lifetime. This talk will outline some recent results from my group towards understanding the mechanics of lattice structures. New results on equivalent elastic properties, buckling and wave propagation will be discussed.
Characteristic comparison of TiO2 thin films with an inorganic and organic pr...inventy
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
Design modern structure for heterojunction quantum dot solar cells IJECEIAES
This paper proposal new structure for improving the optical, electrical characteristics and efficiency of 3 rd generation heterojunction quantum dot solar cell (HJQDSC) (ITO/CdS/QDPbS/Au) model by using the quantum dot window layer instead of bulk structure layers cell. Also, this paper presents theoretically analysis for the performance of the proposal HJQDSC (ITO/QDCdS/QDPbS/Au) structure. The new design structure was applied on traditional (SnO2/CdS/CdTe/Cu) and (ZnO/CdS/CIGS/Mo) thin film solar cells which based on sub-micro absorber layer thickness models by replacing the bulk CdTe, CIGS absorber layers and CdS window layer with quantum dot size materials to achieve higher efficiency with lesser usage layer material. Also, it has been studied the effect of using semiconductors layers in quantum dots size on electric and optical properties of thin film solar cells and the effect of window and absorber layers quantum dots radii on the performance of solar cells. Finally, a thermal efficiency analysis has been investigated for explaining the importance of new structure HJQD solar cells.
Two efficient algorithms for drawing accurate and beautiful phonon dispersionTakeshi Nishimatsu
Purpose: easy drawing of accurate and beautiful phonon dispersion in first-principles calculations
See also: Draw phonon dispersion of Si with Quantum Espresso https://gist.github.com/t-nissie/32c10a148a7fc054b836
Modelling Quantum Transport in Nanostructuresiosrjce
IOSR Journal of Electronics and Communication Engineering(IOSR-JECE) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of electronics and communication engineering and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in electronics and communication engineering. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Numerical Modeling of Nano Bundle and Nano
Rope-Reinforced Polymer Mechanical Properties by Seyed Hossein Mamanpush*, Zahra Matin Ghahfarokhi and Hossein Golestanian in Evolutions in Mechanical
C Engineering
Finite Element Analysis of Damping Performance of VEM Materials Using CLD Tec...IJERA Editor
Most engineering structures experiences vibrational motion, this unwanted vibrations can result in premature
structural failure. Many methods are developed which enhances capability of damping such as constrained layer
damping. Shear motion is produced in VEM due to constraining layer to resist unwanted vibrational energy.
This paper shows theeffect of varying the thickness of viscoelastic materials on damping performance of CLD
beam.The damping performance is measured in terms of modal loss factor.
La iniciativa ‘Fuerteventura Open i-Sland’, presentada por el Cabildo de Fuerteventura, cuenta con un presupuesto de 6.556.533 euros, que serán aportados al 100% por el Ministerio de Industria, Energía y Turismo, a través de Red.es, con la cofinanciación del Fondo Europeo de Desarrollo Regional (FEDER).
This talk was presented at the 22nd International conference on Surface Modification Technology, 22-24 September 2008, in Trollhattan, Sweden. It describes some recent computational research work carried out using molecular dynamics methods to calculate physical properties, including viscosity, of liquid nickel over a wide temperature range.
From the Egyptian, Roman to the Victorian era, important engineering structures were built "solid" for strength and durability. Although many such structures have passed the test of time and therefore validate the underlying design philosophy, they may not always represent the most efficient way of utilising materials. Due to the unprecedented pressure on sustainability and global focus on net-zero, using less material for future engineering structures is mandatory. The rise of 3D printing technology provides a timely solution towards creating "hollow" or "porous" structural members, which have the potential to utilise lesser materials compared to their equivalent solid counterparts. However, the mechanical behaviour of such hollow structures must be understood well and subsequently. They need to be designed carefully to withstand static and dynamic loads to be experienced during their lifetime. This talk will outline some recent results from my group towards understanding the mechanics of lattice structures. New results on equivalent elastic properties, buckling and wave propagation will be discussed.
Characteristic comparison of TiO2 thin films with an inorganic and organic pr...inventy
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
Design modern structure for heterojunction quantum dot solar cells IJECEIAES
This paper proposal new structure for improving the optical, electrical characteristics and efficiency of 3 rd generation heterojunction quantum dot solar cell (HJQDSC) (ITO/CdS/QDPbS/Au) model by using the quantum dot window layer instead of bulk structure layers cell. Also, this paper presents theoretically analysis for the performance of the proposal HJQDSC (ITO/QDCdS/QDPbS/Au) structure. The new design structure was applied on traditional (SnO2/CdS/CdTe/Cu) and (ZnO/CdS/CIGS/Mo) thin film solar cells which based on sub-micro absorber layer thickness models by replacing the bulk CdTe, CIGS absorber layers and CdS window layer with quantum dot size materials to achieve higher efficiency with lesser usage layer material. Also, it has been studied the effect of using semiconductors layers in quantum dots size on electric and optical properties of thin film solar cells and the effect of window and absorber layers quantum dots radii on the performance of solar cells. Finally, a thermal efficiency analysis has been investigated for explaining the importance of new structure HJQD solar cells.
Two efficient algorithms for drawing accurate and beautiful phonon dispersionTakeshi Nishimatsu
Purpose: easy drawing of accurate and beautiful phonon dispersion in first-principles calculations
See also: Draw phonon dispersion of Si with Quantum Espresso https://gist.github.com/t-nissie/32c10a148a7fc054b836
Modelling Quantum Transport in Nanostructuresiosrjce
IOSR Journal of Electronics and Communication Engineering(IOSR-JECE) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of electronics and communication engineering and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in electronics and communication engineering. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Numerical Modeling of Nano Bundle and Nano
Rope-Reinforced Polymer Mechanical Properties by Seyed Hossein Mamanpush*, Zahra Matin Ghahfarokhi and Hossein Golestanian in Evolutions in Mechanical
C Engineering
Finite Element Analysis of Damping Performance of VEM Materials Using CLD Tec...IJERA Editor
Most engineering structures experiences vibrational motion, this unwanted vibrations can result in premature
structural failure. Many methods are developed which enhances capability of damping such as constrained layer
damping. Shear motion is produced in VEM due to constraining layer to resist unwanted vibrational energy.
This paper shows theeffect of varying the thickness of viscoelastic materials on damping performance of CLD
beam.The damping performance is measured in terms of modal loss factor.
La iniciativa ‘Fuerteventura Open i-Sland’, presentada por el Cabildo de Fuerteventura, cuenta con un presupuesto de 6.556.533 euros, que serán aportados al 100% por el Ministerio de Industria, Energía y Turismo, a través de Red.es, con la cofinanciación del Fondo Europeo de Desarrollo Regional (FEDER).
How to develop and grow client relationships using ShootNicola Gammon
For The Landscape Show 2016. How to develop and grow client relationships using Shoot. Panel included Nicola Gammon, Shoot; Gillie Leaf Garden Design, Joan Mulvenna Garden Design Manchester; and Marc Piechocki I-Echo Landscape Design. How to generate more leads, save time, and develop or end client relationships.
LITA Executive Webinar with Niels Loader
Niels will share the insights gained in determining and implementing metrics within IT, particularly focusing on the metrics used in a Lean IT organization. He will focus on the key pitfalls and successful strategies for getting to the right metrics and making them work.
Simulations of the CNFETs using different high-k gate dielectricsjournalBEEI
In this paper we presented the analysis of Carbon Nanotube Field Effect Transistors (CNFETs) using various high-k gate dielectric materials. The objective of this work was to choose the best possible material for gate dielectric. This paper also presented the study on the effect of thickness of gate dielectric on the performance of the device. For the analysis (19, 0) CNT was considered because the diameter of (19, 0) CNT is 1.49nm and the CNFETs have been fabricated with the CNT diameter of ~1.5nm. It has been observed that La2O3 is the best gate dielectric material followed by HfO2 and ZrO2. It was also observed that as thickness of gate dielectric material reduces, drain current of CNFET increases. The outcomes of this study matches with the analytical results and hence confirm the results.
This paper addresses the fracture toughness ( ), or also known as critical stress intensity Factor, according to
conditions of Lineal Elastic Fracture Mechanics (LEFM). The characterization of the mechanical properties in
tensile and fracture toughness of structural steel pipes API-5L used in hydrocarbons transportation was
performed. For fracture toughness, the material was tested through fatigue crack propagation on standardized
compact specimen (CT) according to ASTM E-399 norm. A thickness (B) equal to and a crack size (a) equal
to 0.5w were used. With the porpoise of establishing the adequate conditions at the crack tip, the specimens were
subjected to fatigue pre-cracking by application of repeated cycles of load in tensile-tensile and constant load
amplitude with a load ratio of R = 0.1. The experimental Compliance method was used based on data obtained
from load vs. Crack Mouth Opening Displacement (CMOD). The results show a Stress Intensity factor of 35.88
MPa√m for a 25 mm crack size specimen. The device used for testing is a MTS-810 machine with capacity of
100KN and 6 kHz sampling rate, which meets the conditions of the ASTM E-399 standard. The cracking
susceptibility of steel is influenced by the size, morphology and distribution of non-metallic inclusions,
thermochemical interaction with the environment and microstructure.
Optimization of Thin Adhesive Layer Based on Colonial Competitive AlgorithmWaqas Tariq
In this paper a novel evolutionary global search strategy called colonial competitive algorithm (CCA) is utilized to determine an optimal imperfect transmission condition for a thin intermediate layer which reveal between two bonded materials in a dissimilar strip with a temperature-dependent source or sink formulation. Recently introduced CCA has proven its excellent capabilities such as faster convergence and better global optimum achievement. Finally the results of CCA are compared with finite element analysis. Comparison is shown the success of CCA for design of adhesive joints.
Effect of Chirality and Oxide Thikness on the Performance of a Ballistic CNTF...IJECEIAES
Since the discovery of 1D nano-object, they are constantly revealing significant physical properties. In this regard, carbon nanotube (CNT) is considered as a promising candidate for application in future nanoelectronics devices like carbon nanotube field effect transistor (CNTFET). In this work, the impact of chirality and gate oxide thikness on the electrical characteristics of a CNTFET are studied. The chiralities used are (5, 0), (10, 0), (19, 0), (26, 0), and the gate oxide thikness varied from 1 to 5 nm. This work is based on a numerical simulation program based on surface potential model. CNTFET Modeling is useful for semiconductor industries for nano scale devices manufacturing. From our results we have observed that the output current increases with chirality increasing. We have also highlighted the importance of the gate oxide thickness on the drain current that increases when gate oxide is thin.
Measurements Of Dielectric Constant Of Solid Material (Leather Belt) At X-Ba...IJMER
This article discusses the experimental measurement technique for dielectric constant (i.e.
permittivity ) of leather belt at X-band. This measurement play selection of dielectric constant for
antenna substrate. This leather can be used as flexible substrate of wearable microstrip antenna. This
measurement system consist of solid state klystron power supply, isolator, VSWR meter, frequency meter,
solid dielectric cell (XC-501). This data may be interested in flexibility wearable microstrip antenna
studies and design.
Characterization of Mechanical, Thermal, and Electrical Properties of Carbon ...drboon
In this paper, the mechanical, thermal and electrical properties of carbon fiber modified thermoplastic polyimide were numerically analyzed by finite element analysis. A three-dimensional model was created, in which continuous carbon fibers are aligning and paralleling to each other and uniformly distributing in the polymer matrix. The behaviors of the composites in two extreme situations, i.e., parallel or perpendicular to carbon fiber direction, were simulated. The effects of the volume fraction of carbon fiber content on the physical properties were investigated. It shows clearly that carbon fibers significantly improve the mechanical strength, and thermal and electrical conductivities. The future work includes investigation of the physical properties of the conductive network of the composites with random carbon fiber orientation, and different fillers, such as graphite, and carbon nanotubes.
Epistemic Interaction - tuning interfaces to provide information for AI supportAlan Dix
Paper presented at SYNERGY workshop at AVI 2024, Genoa, Italy. 3rd June 2024
https://alandix.com/academic/papers/synergy2024-epistemic/
As machine learning integrates deeper into human-computer interactions, the concept of epistemic interaction emerges, aiming to refine these interactions to enhance system adaptability. This approach encourages minor, intentional adjustments in user behaviour to enrich the data available for system learning. This paper introduces epistemic interaction within the context of human-system communication, illustrating how deliberate interaction design can improve system understanding and adaptation. Through concrete examples, we demonstrate the potential of epistemic interaction to significantly advance human-computer interaction by leveraging intuitive human communication strategies to inform system design and functionality, offering a novel pathway for enriching user-system engagements.
GraphRAG is All You need? LLM & Knowledge GraphGuy Korland
Guy Korland, CEO and Co-founder of FalkorDB, will review two articles on the integration of language models with knowledge graphs.
1. Unifying Large Language Models and Knowledge Graphs: A Roadmap.
https://arxiv.org/abs/2306.08302
2. Microsoft Research's GraphRAG paper and a review paper on various uses of knowledge graphs:
https://www.microsoft.com/en-us/research/blog/graphrag-unlocking-llm-discovery-on-narrative-private-data/
Smart TV Buyer Insights Survey 2024 by 91mobiles.pdf91mobiles
91mobiles recently conducted a Smart TV Buyer Insights Survey in which we asked over 3,000 respondents about the TV they own, aspects they look at on a new TV, and their TV buying preferences.
UiPath Test Automation using UiPath Test Suite series, part 4DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 4. In this session, we will cover Test Manager overview along with SAP heatmap.
The UiPath Test Manager overview with SAP heatmap webinar offers a concise yet comprehensive exploration of the role of a Test Manager within SAP environments, coupled with the utilization of heatmaps for effective testing strategies.
Participants will gain insights into the responsibilities, challenges, and best practices associated with test management in SAP projects. Additionally, the webinar delves into the significance of heatmaps as a visual aid for identifying testing priorities, areas of risk, and resource allocation within SAP landscapes. Through this session, attendees can expect to enhance their understanding of test management principles while learning practical approaches to optimize testing processes in SAP environments using heatmap visualization techniques
What will you get from this session?
1. Insights into SAP testing best practices
2. Heatmap utilization for testing
3. Optimization of testing processes
4. Demo
Topics covered:
Execution from the test manager
Orchestrator execution result
Defect reporting
SAP heatmap example with demo
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Slack (or Teams) Automation for Bonterra Impact Management (fka Social Soluti...Jeffrey Haguewood
Sidekick Solutions uses Bonterra Impact Management (fka Social Solutions Apricot) and automation solutions to integrate data for business workflows.
We believe integration and automation are essential to user experience and the promise of efficient work through technology. Automation is the critical ingredient to realizing that full vision. We develop integration products and services for Bonterra Case Management software to support the deployment of automations for a variety of use cases.
This video focuses on the notifications, alerts, and approval requests using Slack for Bonterra Impact Management. The solutions covered in this webinar can also be deployed for Microsoft Teams.
Interested in deploying notification automations for Bonterra Impact Management? Contact us at sales@sidekicksolutionsllc.com to discuss next steps.
Key Trends Shaping the Future of Infrastructure.pdfCheryl Hung
Keynote at DIGIT West Expo, Glasgow on 29 May 2024.
Cheryl Hung, ochery.com
Sr Director, Infrastructure Ecosystem, Arm.
The key trends across hardware, cloud and open-source; exploring how these areas are likely to mature and develop over the short and long-term, and then considering how organisations can position themselves to adapt and thrive.
GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using Deplo...James Anderson
Effective Application Security in Software Delivery lifecycle using Deployment Firewall and DBOM
The modern software delivery process (or the CI/CD process) includes many tools, distributed teams, open-source code, and cloud platforms. Constant focus on speed to release software to market, along with the traditional slow and manual security checks has caused gaps in continuous security as an important piece in the software supply chain. Today organizations feel more susceptible to external and internal cyber threats due to the vast attack surface in their applications supply chain and the lack of end-to-end governance and risk management.
The software team must secure its software delivery process to avoid vulnerability and security breaches. This needs to be achieved with existing tool chains and without extensive rework of the delivery processes. This talk will present strategies and techniques for providing visibility into the true risk of the existing vulnerabilities, preventing the introduction of security issues in the software, resolving vulnerabilities in production environments quickly, and capturing the deployment bill of materials (DBOM).
Speakers:
Bob Boule
Robert Boule is a technology enthusiast with PASSION for technology and making things work along with a knack for helping others understand how things work. He comes with around 20 years of solution engineering experience in application security, software continuous delivery, and SaaS platforms. He is known for his dynamic presentations in CI/CD and application security integrated in software delivery lifecycle.
Gopinath Rebala
Gopinath Rebala is the CTO of OpsMx, where he has overall responsibility for the machine learning and data processing architectures for Secure Software Delivery. Gopi also has a strong connection with our customers, leading design and architecture for strategic implementations. Gopi is a frequent speaker and well-known leader in continuous delivery and integrating security into software delivery.
Software Delivery At the Speed of AI: Inflectra Invests In AI-Powered QualityInflectra
In this insightful webinar, Inflectra explores how artificial intelligence (AI) is transforming software development and testing. Discover how AI-powered tools are revolutionizing every stage of the software development lifecycle (SDLC), from design and prototyping to testing, deployment, and monitoring.
Learn about:
• The Future of Testing: How AI is shifting testing towards verification, analysis, and higher-level skills, while reducing repetitive tasks.
• Test Automation: How AI-powered test case generation, optimization, and self-healing tests are making testing more efficient and effective.
• Visual Testing: Explore the emerging capabilities of AI in visual testing and how it's set to revolutionize UI verification.
• Inflectra's AI Solutions: See demonstrations of Inflectra's cutting-edge AI tools like the ChatGPT plugin and Azure Open AI platform, designed to streamline your testing process.
Whether you're a developer, tester, or QA professional, this webinar will give you valuable insights into how AI is shaping the future of software delivery.
Builder.ai Founder Sachin Dev Duggal's Strategic Approach to Create an Innova...Ramesh Iyer
In today's fast-changing business world, Companies that adapt and embrace new ideas often need help to keep up with the competition. However, fostering a culture of innovation takes much work. It takes vision, leadership and willingness to take risks in the right proportion. Sachin Dev Duggal, co-founder of Builder.ai, has perfected the art of this balance, creating a company culture where creativity and growth are nurtured at each stage.
State of ICS and IoT Cyber Threat Landscape Report 2024 previewPrayukth K V
The IoT and OT threat landscape report has been prepared by the Threat Research Team at Sectrio using data from Sectrio, cyber threat intelligence farming facilities spread across over 85 cities around the world. In addition, Sectrio also runs AI-based advanced threat and payload engagement facilities that serve as sinks to attract and engage sophisticated threat actors, and newer malware including new variants and latent threats that are at an earlier stage of development.
The latest edition of the OT/ICS and IoT security Threat Landscape Report 2024 also covers:
State of global ICS asset and network exposure
Sectoral targets and attacks as well as the cost of ransom
Global APT activity, AI usage, actor and tactic profiles, and implications
Rise in volumes of AI-powered cyberattacks
Major cyber events in 2024
Malware and malicious payload trends
Cyberattack types and targets
Vulnerability exploit attempts on CVEs
Attacks on counties – USA
Expansion of bot farms – how, where, and why
In-depth analysis of the cyber threat landscape across North America, South America, Europe, APAC, and the Middle East
Why are attacks on smart factories rising?
Cyber risk predictions
Axis of attacks – Europe
Systemic attacks in the Middle East
Download the full report from here:
https://sectrio.com/resources/ot-threat-landscape-reports/sectrio-releases-ot-ics-and-iot-security-threat-landscape-report-2024/
JMeter webinar - integration with InfluxDB and GrafanaRTTS
Watch this recorded webinar about real-time monitoring of application performance. See how to integrate Apache JMeter, the open-source leader in performance testing, with InfluxDB, the open-source time-series database, and Grafana, the open-source analytics and visualization application.
In this webinar, we will review the benefits of leveraging InfluxDB and Grafana when executing load tests and demonstrate how these tools are used to visualize performance metrics.
Length: 30 minutes
Session Overview
-------------------------------------------
During this webinar, we will cover the following topics while demonstrating the integrations of JMeter, InfluxDB and Grafana:
- What out-of-the-box solutions are available for real-time monitoring JMeter tests?
- What are the benefits of integrating InfluxDB and Grafana into the load testing stack?
- Which features are provided by Grafana?
- Demonstration of InfluxDB and Grafana using a practice web application
To view the webinar recording, go to:
https://www.rttsweb.com/jmeter-integration-webinar
LF Energy Webinar: Electrical Grid Modelling and Simulation Through PowSyBl -...DanBrown980551
Do you want to learn how to model and simulate an electrical network from scratch in under an hour?
Then welcome to this PowSyBl workshop, hosted by Rte, the French Transmission System Operator (TSO)!
During the webinar, you will discover the PowSyBl ecosystem as well as handle and study an electrical network through an interactive Python notebook.
PowSyBl is an open source project hosted by LF Energy, which offers a comprehensive set of features for electrical grid modelling and simulation. Among other advanced features, PowSyBl provides:
- A fully editable and extendable library for grid component modelling;
- Visualization tools to display your network;
- Grid simulation tools, such as power flows, security analyses (with or without remedial actions) and sensitivity analyses;
The framework is mostly written in Java, with a Python binding so that Python developers can access PowSyBl functionalities as well.
What you will learn during the webinar:
- For beginners: discover PowSyBl's functionalities through a quick general presentation and the notebook, without needing any expert coding skills;
- For advanced developers: master the skills to efficiently apply PowSyBl functionalities to your real-world scenarios.
The Art of the Pitch: WordPress Relationships and SalesLaura Byrne
Clients don’t know what they don’t know. What web solutions are right for them? How does WordPress come into the picture? How do you make sure you understand scope and timeline? What do you do if sometime changes?
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The Art of the Pitch: WordPress Relationships and Sales
Inocuchi[3]
1. CREEP BEHAVIOUR OF KEVLAR 49
INOKUCHI MATHEMATIC ANALYSE
S. KACI1
, Z. TOUTOU1
, P. MORLIER2
1
Institut de Génie-Civil,
Université Mouloud MAMMERI de Tizi-Ouzou
Tizi-Ouzou, 15000, Algérie
2
Laboratoire de Rhéologie du Bois de Bordeaux
33610 Cestas-Gazinet, Pierroton, INRA, France
ABSTRACT :
Composite materials which are highly used in high technology industries such as aeronautic
and space are nowadays introduced in building industry.
Because of their good physicochemical characteristics, composite cables can be used as
substitute for steel in prestressed concrete. However, their long term mechanical behaviour is
still not fully understood. Therefore, a rheological model describing the creep behaviour of
cords of Kevlar type 49 is presented in this study.
The obtained simulations are in good agreement with the experimental results.
KEYWORDS : Kevlar, Prestress, Creep, Mechanical Behaviour, Viscoelasticity, Rheological
Model, Simulation, Building Industry.
INTRODUCTION
Composite cables, because of the fact that they are not subject to corrosion and, in addition, in
the long run and at room temperature, show prestress losses due to weak flow and relaxation,
can be used as prestress tools. Also their low density as well as their highly performing
tension features incite researchers and industry related people to use them to build bridges and
other structures, as well as for restoration purposes in damaged structures. Indeed, these
composite materials are being used in many industries such as aeronautics and car
manufacturing, and they are the subject of many research works (1,2, 3, 4, 5). However, to
use these Kevlar reinforced cables as means of prestress, it is necessary to get a good
knowledge tendon (6, 7, 8, 9), helped to know the evolution with time of its relaxation
modulud.
Within the scope of this article, the results of the research which has been carried out on the
study of the creep behaviour under tension of composite cables ( Kevlar high modulus, 0.95
TWA2 ) are presented.
INOKUCHI MATHEMATIC ANALYSE (Application to creep behaviour of Kevlar 49)
The material tested is a braided high modulus Kevlar cord, impregnated with a heat-hardening
resin of Polyester urethane; The composite, thus obtained, has a cylindrical shape of diameter
0.95 mm (11).
2. Using existing experimental results obtained on this cords of Kevlar type 0.95 TWA2 (12,13),
a rheological model, based on the method of Inocuchi (14), for the long term behaviour of this
material is presented.
The general model which correspond to a creep function of a viscoelastic material is made of
an association in series of a Maxwell cells and a certain number of Kelvin Voigt solids
depending on the viscoelasticity degree of the material.
The total strain is the sum of the elementary strains. Therefore, the general expression of the
creep function is given by:
∑
=
−
−++=
n
i
it
eiJ
t
Jtf
1
)
/
1(
0
0)(
θ
η
(1)
Now, the problem consists in obtaining the different parameters (η0 , J0, Ji, ηi and θi ).
DETERMINATION OF THE PARAMETERS (J0 , ηηηη0 , Ji, ηηηηi and θθθθi ).
Determination of Jo and ηηηη0
The creep experimental curve of the viscoelastic material is represented on figure 1.
Figure 1. Experimental creep behaviour of Kevlar 49 (12)
From this curve, the value of Jo and ηo can be obtained because:
Jo (which is the instantaneous elastic compliance) represents the ordinate at the origin
of the curve f(t).
1
0η
(which is the coefficient of Newtonian viscosity) represents the slope of the
asymptotic the curve.
Jo and ηo are respectively measured as:
3. Jo = 1.02*10-11
Pa-1
θ0 = 105
mn
And ηo =9800 GPa.mn ≈ ∞ (considered as infinite).
Next, there is still to determine the number ni of the Kelvin Voigt cells and, therefore, the
parameters ηi and Ji corresponding to each cell.
Determination of the parameters Ji, ηηηηi, and θθθθi
The parameters are determined by means of the mathematical analysis developed by Inocushi
(14).
Determination of the parameters J1, ηηηη1 and θθθθ1
Given a function such that:
Q t J ei
t
i
n
i
( ) /
= −
=
∑ θ
1
(2)
Considering that t is sufficiently big, it is clear from a first analysis that the function to be
considered is:
Q(t) = J1e-t/θ1
⇒ LnQ(t) = LnJ1 – t/θ1 .(3)
It follows that the graph of LnQ(t) = f(t) is a non linear curve, figure 2.
Figure2. Representative curve of the function Ln Q(t)
From this figure, it can seen that Ln(J1) is the ordinate at the origin. Therefore, the values of
the parameters J1 and η1 can be obtained as :
J1 = 1.23 * 10-11
Pa-1
, θ1 = 400 mn and η1 = 32.5 GPa.mn.
4. Determination of the parameters J2, ηηηη2 and θθθθ2
As a second analysis, the function Q’(t)= q(t)- J1e-t/θ1
is considered. Taking the natural
logarithm, it follows:
LnQ’(t)=Ln( q(t)- J1e-t/θ1
) (4)
From the graph Ln(Q’(t)), figure 3, the values of the parameters J2, θ2 and η2 are obtained.
J2= 3.02 * 10-11
Pa-1
, θ2 = 80 mn and η2= 2.649 GPa.mn.
Figure 3. Representative curve of the function Ln Q’(t)
Since the graph of Ln(Q’(t)) is a linear curve, there is no need to do a third analysis.
Therefore, the material Kevlar 49 can be represented adequately with two Kelvin Voigt
solids.
CONCLUSION
The long term behaviour of Kevlar 49 can be represented by a model composed of a
spring (compliance Jo) and two Kelvin Voigt cells (figure 4). The creep function can
expressed as follows:
1180/400/
10*))1(02.3)1(23.102.1()( −−−
−+−+= tt
eetf (5)
5. Figure 4. Rheological model of Kevlar 49 cable (type 0.95 TWA2)
The obtained results are in good agreement with experimental ones as shown on figure 5.
Figure 5. Creep behaviour of Kevlar 49 cable (type 0.95 TWA2)
SYMBOLS
- f : creep function of the viscoelastic material
- t : time
- Jo : instantaneous elastic compliance
- ηo : coefficient of newtonian viscosity
- θ0 = Jo * ηo : retardation time
- J1, η1, θ1, : parameters of the Kelvin Voigt cell number 1
- J2, η2, θ2, : parameters of the Kelvin Voigt cell number 2
J1
J0
J2
η1
η2
σ
σ
6. REFERENCES
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