Metamaterials are artificial materials engineered to have properties that are not found in nature. They derive their properties from their structure rather than composition. Depending on their structure, metamaterials can have a refractive index less than 1 or even negative refractive index. Left-handed materials have a negative refractive index. While natural materials cannot simultaneously exhibit negative permittivity and permeability, metamaterials can be designed with these properties. Potential applications of metamaterials include antennas, superlenses beyond the diffraction limit, cloaking devices, and modeling conditions of the big bang.
This ppt give an idea about what metamaterial is? how are they formed? and introduces to the techniques to analyze them. A few applications of metamaterials are also mentioned.
Using Metamaterials as Optical Perfect AbsorberSepehr A. Benis
Â
Article review and presentation on basics of using metamaterials as optical perfect absorbers
Metamaterial Course Final Project ( Optional Graduate Course )
Dr. Leyla Yousefi
This ppt give an idea about what metamaterial is? how are they formed? and introduces to the techniques to analyze them. A few applications of metamaterials are also mentioned.
Using Metamaterials as Optical Perfect AbsorberSepehr A. Benis
Â
Article review and presentation on basics of using metamaterials as optical perfect absorbers
Metamaterial Course Final Project ( Optional Graduate Course )
Dr. Leyla Yousefi
Metematterials are artificial structures designed to have unique properties not found in common materials such as negative refractive index, elasticity, can modify sound waves, enhance radiated power ect.
Using Metamaterial as Optical Perfect AbsorberSepehr A. Benis
Â
Article review and presentation on basics of using metamaterials as optical perfect absorbers
Metamaterial Course Final Project ( Optional Graduate Course )
Dr. Leyla Yousefi
DPS material
DNG material ( Do not depend on the chemical composition, Depend on the geometry of the structure units, Metamaterials are artificial engineered composite structures, Not commonly found in nature)
MNG material
ENG material
Meta materials are advance materials with negative refractive index, they show excellent applications like cloaking effect, super lens, WMD detectors also flying doughnut etc. They are very futuristic . This presentation explains the basic definition, history, scientific principle and its applications etc.
Photonic crystals are periodic dielectric structures that have a band gap that forbids propagation of a certain frequency range of light. This property enables one to control light with amazing facility and produce effects that are impossible with conventional optics.Photonic crystals can be fabricated for one, two, or three dimensions. One-dimensional photonic crystals can be made of layers deposited or stuck together. Two-dimensional ones can be made by photolithography, or by drilling holes in a suitable substrate. Fabrication methods for three-dimensional ones include drilling under different angles, stacking multiple 2-D layers on top of each other, direct laser writing, or, for example, instigating self-assembly of spheres in a matrix and dissolving the spheres
Metamaterial is an arrangement of artificial structural elements, designed to achieve advantageous and unusual electromagnetic properties
meta = beyond (Greek)
Metematterials are artificial structures designed to have unique properties not found in common materials such as negative refractive index, elasticity, can modify sound waves, enhance radiated power ect.
Using Metamaterial as Optical Perfect AbsorberSepehr A. Benis
Â
Article review and presentation on basics of using metamaterials as optical perfect absorbers
Metamaterial Course Final Project ( Optional Graduate Course )
Dr. Leyla Yousefi
DPS material
DNG material ( Do not depend on the chemical composition, Depend on the geometry of the structure units, Metamaterials are artificial engineered composite structures, Not commonly found in nature)
MNG material
ENG material
Meta materials are advance materials with negative refractive index, they show excellent applications like cloaking effect, super lens, WMD detectors also flying doughnut etc. They are very futuristic . This presentation explains the basic definition, history, scientific principle and its applications etc.
Photonic crystals are periodic dielectric structures that have a band gap that forbids propagation of a certain frequency range of light. This property enables one to control light with amazing facility and produce effects that are impossible with conventional optics.Photonic crystals can be fabricated for one, two, or three dimensions. One-dimensional photonic crystals can be made of layers deposited or stuck together. Two-dimensional ones can be made by photolithography, or by drilling holes in a suitable substrate. Fabrication methods for three-dimensional ones include drilling under different angles, stacking multiple 2-D layers on top of each other, direct laser writing, or, for example, instigating self-assembly of spheres in a matrix and dissolving the spheres
Metamaterial is an arrangement of artificial structural elements, designed to achieve advantageous and unusual electromagnetic properties
meta = beyond (Greek)
Optical or light related sensors and its principles are discussed. The use of the LDR, photocell, photodiodes, and many more transducers which are based on optical sensors are discussed with the applications related to it.
GraphRAG is All You need? LLM & Knowledge GraphGuy Korland
Â
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/
Encryption in Microsoft 365 - ExpertsLive Netherlands 2024Albert Hoitingh
Â
In this session I delve into the encryption technology used in Microsoft 365 and Microsoft Purview. Including the concepts of Customer Key and Double Key Encryption.
Generative AI Deep Dive: Advancing from Proof of Concept to ProductionAggregage
Â
Join Maher Hanafi, VP of Engineering at Betterworks, in this new session where he'll share a practical framework to transform Gen AI prototypes into impactful products! He'll delve into the complexities of data collection and management, model selection and optimization, and ensuring security, scalability, and responsible use.
SAP Sapphire 2024 - ASUG301 building better apps with SAP Fiori.pdfPeter Spielvogel
Â
Building better applications for business users with SAP Fiori.
• What is SAP Fiori and why it matters to you
• How a better user experience drives measurable business benefits
• How to get started with SAP Fiori today
• How SAP Fiori elements accelerates application development
• How SAP Build Code includes SAP Fiori tools and other generative artificial intelligence capabilities
• How SAP Fiori paves the way for using AI in SAP apps
The Art of the Pitch: WordPress Relationships and SalesLaura Byrne
Â
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?
All these questions and more will be explored as we talk about matching clients’ needs with what your agency offers without pulling teeth or pulling your hair out. Practical tips, and strategies for successful relationship building that leads to closing the deal.
State of ICS and IoT Cyber Threat Landscape Report 2024 previewPrayukth K V
Â
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/
UiPath Test Automation using UiPath Test Suite series, part 4DianaGray10
Â
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
UiPath Test Automation using UiPath Test Suite series, part 4
Â
Metamaterials
1. METAMATERIALS Introduction to METAMATERIALS and APPLICATION
2. Refractive Index The refractive index, n, of a medium is defined as the ratio of the speed, C, of a wave phenomenon such as light or sound in a reference medium to the phase speed, Vp, of the wave in the medium. n = C / Vp
3. Refractive index below 1 A widespread misconception is that since, according to the theory of relativity, nothing can travel faster than the speed of light in vacuum, the refractive index cannot be lower than 1. This is erroneous since the refractive index measures the phase velocity of light, which does not carry energy or information, which are the two things limited in propagation speed. The phase velocity is the speed at which the crests of the wave move and can be faster than the speed of light in vacuum, and thereby give a refractive index below 1.
4. Phase Velocity The phase velocity of a wave is the rate at which the phase of the wave propagates in space. This is the speed at which the phase of any one frequency component of the wave travels. Phase velocity can exceed C because it does not carry any energy or information.
5. Metamaterials Metamaterials usually gain their properties from structure rather than composition. Depending on the structure , metamaterials may have refractive index less than 1 and even negative. Size of structural components of metamaterials is restricted in range of wavelength of operation .
6. Left Handed Materials (LHMs) Left-handed media (LHM), Backward wave media (BW media). LHM have negative value of refractive index. Victor Veselago , a Russian physicist first showed in his research that if a material has negative value of both permittivity, ε, and permeability μ simultaneously will have negative value of refractive index.
7. Limitation of natural materials Most dielectrics only have positive permittivities , ε > 0 . Metals will exhibit negative permittivity, ε < 0 at optical frequencies, and plasmas exhibit negative permittivity values in certain frequency bands. However, in each of these cases permeability remains always positive. At microwave frequencies, it is possible for negative μ to occur in some ferromagnetic materials. But, the inherent drawback is they are difficult to find above terahertz frequencies. In any case, a natural material that can achieve negative values for permittivity and permeability simultaneously has not been found, or discovered.
8. Composite Materials These are synthetic materials constructed to have physical properties never before produced in nature. Synthetic materials could be constructed to purposely exhibit an negative permittivity and permeability simultaneously . Size of resonators and copper wire used in these materials are almost equal to wavelength of operation.
9.
10. Left Handed Materials (LHMs)
11. Application of Metamaterials Metamaterial antenna Superlens Cloaking device Invisible Submarines Photonics OR opto-electronics Create the oft-discussed, Invisible Man Perfect Absorber of light Ultra high capacity storage devices etc.
13. Metamaterial antenna The challenge of the antenna field is that there are fundamental limitations on antenna quality factor and its electrical size. These antennas measure just a few millimetres long and are as flat as paper, the new multiband antennas could double the range, reliability and battery life of cellular phones, Wi-Fi routers and wireless modems. The newest metamaterials antennas radiate as much as 95 percent of an input radio signal. Conventional antennas that are very small compared to the wavelength, most of the signal is reflected back to the source. The metamaterial , on the other hand, makes the antenna behave as if it were much larger than it really is, because the novel antenna structure stores energy, and re-radiates it. Because of small size these antennas can be used on limited space platforms as on-board airplanes and ships .
14. Diffraction-limit The resolution of an optical imaging system ,a microscope, telescope, or camera can be limited by factors such as imperfections in the lenses or misalignment. The minimum angular separation of two sources that can be distinguished by a telescope depends on the wavelength of the light being observed and the diameter of the telescope. This angle is called the DIFFRACTION LIMIT.
15. Beyond diffraction limit (superlens) A superlens , super lens or perfect lens is a lens which uses metamaterials to go beyond the diffraction limit. Lenses that have no blurring effect, resulting in ultra-sharp images. Both propagating and evanescent waves contribute to the resolution of the image But wavelength of operation is limited by size of components used in metamaterial so this is still not possible to use visible light (wave length in nanometres) but it was successful in microwave range.
16. Cloaking device The Duke cloaking device only masks an object from one wavelength of microwave light.
17. Cloaking device it is possible to design metamaterial "cloak" so that it guides light around some region, rendering it invisible over a certain band of wavelengths. The Duke team used metamaterials to make their cloaking device have gradually varying refractive indices - from 1 on the outside of the device, decreasing to zero in the centre . The result is that microwave light subtly bends around the device and is able to reform on the other side, although with some detectable distortion .
18. Cloaking device (limitations) Due to limitation on size ,still its not possible to make a cloak device for operating wavelength in visible band. Current devices work only for one wavelength but visible light has many wavelength . People inside a cloaked area wouldn't be able to see out because all visible light would be bending around where they are positioned. They'd be invisible, but they'd be blind, too.
19. Cloaking device( possibilities ) Making a large building invisible so that the park on the other side can be seen. Improving the range of wireless devices by allowing waves to bend and flow around obstructing objects. Cloaked military vehicles and outposts . Eliminating shadows and reflections (from a military plane, for example) Etc.
20. Figure out the big bang Using metamaterials, scientists can create a “toy big bang” using precisely designed metamaterials that are mathematically analogous to certain conditions of the real-world big bang