The Smith chart is a graphical method that is essential for microwave engineering. It allows microwave engineers to represent normalized impedances on a chart. Developed by Philip Smith in 1939, the chart maps the reflection coefficient Γ which relates the load and source impedances. It uses constant resistance and reactance circles to plot impedance points. Microwave engineers can use the Smith chart and vector network analyzers to measure reflection coefficients over frequency sweeps.
Second Order Perturbations During Inflation Beyond Slow-rollIan Huston
This is a talk I gave at the University of Sussex in June 2011. It outlines the newly released numerical code Pyflation and the results published in arXiv:1103.0912.
Second Order Perturbations During Inflation Beyond Slow-rollIan Huston
This is a talk I gave at the University of Sussex in June 2011. It outlines the newly released numerical code Pyflation and the results published in arXiv:1103.0912.
A presentation covering some of the basics of standing waves and the differences between standing and travelling waves. Practice questions are included at the end.
Please download the presentation in order to see the gifs.
SCRUTINY TO THE NON-AXIALLY DEFORMATIONS OF AN ELASTIC FOUNDATION ON A CYLIND...P singh
This paper is devoted to homogenization of partial differential operators to use in special structure that is a plate allied to an elastic foundation when it is situated through the basic loads (especially with the harmonic forces) with a Non-axially deformation of the cantilever. Furthermore, it contains the Equations of motion that they can be derived from degenerate Non-linear elliptic ones. Through the mentioned processes, there exists many excess works related to computing the bounded conditions for this special application form of study (when the deformation phenomenon has occurred). At the end of the article whole results of the study on a circular plate are debated and new ways assigned to them are discussed. Afterwards all the processes are formulised with the collection of contracting sequences and expanding sequences integrable functions that are intrinsically joints with the characteristic functions to expanding the behaviour of an elastic foundation. Thenceforth all the resultant functions are sets and compared with the other ones (without the loads). Sample pictures and analysis of the study were employed with the ANSYS software to obtain the better observations and conclusions.
Dual Gravitons in AdS4/CFT3 and the Holographic Cotton TensorSebastian De Haro
Talk given at the workshop "Gravity in Three Dimensions" at the Erwin Schrödinger Institute, Vienna, April 14-24, 2009. I argue that gravity theories in AdS4 are holographically dual to either of two three-dimensional CFT's: the usual Dirichlet CFT1 where the fixed graviton acts as a source for the stress-energy tensor, or a dual CFT2 with a fixed dual graviton which acts as a source for a dual stress-energy tensor. The dual stress-energy tensor is shown to be the Cotton tensor of the Dirichlet CFT. The two CFT's are related by a Legendre transformation generated by a gravitational Chern-Simons coupling. This duality is a gravitational version of electric-magnetic duality valid at any radius r, where the renormalized stress-energy tensor is the electric field and the Cotton tensor is the magnetic field. Generic Robin boundary conditions lead to CFT's coupled to Cotton gravity or topologically massive gravity. Interaction terms with CFT1 lead to a non-zero vev of the stress-energy tensor in CFT2 coupled to gravity even after the source is removed.
Search and Society: Reimagining Information Access for Radical FuturesBhaskar Mitra
The field of Information retrieval (IR) is currently undergoing a transformative shift, at least partly due to the emerging applications of generative AI to information access. In this talk, we will deliberate on the sociotechnical implications of generative AI for information access. We will argue that there is both a critical necessity and an exciting opportunity for the IR community to re-center our research agendas on societal needs while dismantling the artificial separation between the work on fairness, accountability, transparency, and ethics in IR and the rest of IR research. Instead of adopting a reactionary strategy of trying to mitigate potential social harms from emerging technologies, the community should aim to proactively set the research agenda for the kinds of systems we should build inspired by diverse explicitly stated sociotechnical imaginaries. The sociotechnical imaginaries that underpin the design and development of information access technologies needs to be explicitly articulated, and we need to develop theories of change in context of these diverse perspectives. Our guiding future imaginaries must be informed by other academic fields, such as democratic theory and critical theory, and should be co-developed with social science scholars, legal scholars, civil rights and social justice activists, and artists, among others.
Accelerate your Kubernetes clusters with Varnish CachingThijs Feryn
A presentation about the usage and availability of Varnish on Kubernetes. This talk explores the capabilities of Varnish caching and shows how to use the Varnish Helm chart to deploy it to Kubernetes.
This presentation was delivered at K8SUG Singapore. See https://feryn.eu/presentations/accelerate-your-kubernetes-clusters-with-varnish-caching-k8sug-singapore-28-2024 for more details.
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/
UiPath Test Automation using UiPath Test Suite series, part 3DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 3. In this session, we will cover desktop automation along with UI automation.
Topics covered:
UI automation Introduction,
UI automation Sample
Desktop automation flow
Pradeep Chinnala, Senior Consultant Automation Developer @WonderBotz and UiPath MVP
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Neuro-symbolic is not enough, we need neuro-*semantic*Frank van Harmelen
Neuro-symbolic (NeSy) AI is on the rise. However, simply machine learning on just any symbolic structure is not sufficient to really harvest the gains of NeSy. These will only be gained when the symbolic structures have an actual semantics. I give an operational definition of semantics as “predictable inference”.
All of this illustrated with link prediction over knowledge graphs, but the argument is general.
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?
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.
DevOps and Testing slides at DASA ConnectKari Kakkonen
My and Rik Marselis slides at 30.5.2024 DASA Connect conference. We discuss about what is testing, then what is agile testing and finally what is Testing in DevOps. Finally we had lovely workshop with the participants trying to find out different ways to think about quality and testing in different parts of the DevOps infinity loop.
Transcript: Selling digital books in 2024: Insights from industry leaders - T...BookNet Canada
The publishing industry has been selling digital audiobooks and ebooks for over a decade and has found its groove. What’s changed? What has stayed the same? Where do we go from here? Join a group of leading sales peers from across the industry for a conversation about the lessons learned since the popularization of digital books, best practices, digital book supply chain management, and more.
Link to video recording: https://bnctechforum.ca/sessions/selling-digital-books-in-2024-insights-from-industry-leaders/
Presented by BookNet Canada on May 28, 2024, with support from the Department of Canadian Heritage.
2. Microwave Engineering
1. Smith chart
Photo of Smith chart
Graphical method
Essential diagram for
microwave engineering
P. Smith in 1939
2 EM Wave Lab
3. Microwave Engineering
1. Smith chart
Induction of Smith chart
Γ =| Γ | e jφ where | Γ |< 1
Z − Z0
Γ= L
Z L + Z0
Normalized load impedance :
Z L RL + jX L
z L = r + jx = =
Z0 Z0
zL −1 1+ Γ
Γ=
zL + 1
or z L =
1− Γ
Γ = Γr + jΓi
3 EM Wave Lab
4. Microwave Engineering
1. Smith chart
Induction of Smith chart
1 + Γr + jΓi
z L = r + jx =
1 − Γr − jΓi
1 − Γr2 − Γi2 2Γi
r= x=
(1 − Γr ) 2 + Γi2 (1 − Γr ) 2 + Γi2
Circle equations
2 2 2 2
r 1 1 1
Γr − + Γi =
2
, ( Γr − 1) + Γi − =
2
1+ r 1+ r x x
4 EM Wave Lab
5. Microwave Engineering
1. Smith chart
Constant resistance circles
2 2
r 1
Γr − + Γi =
2
1+ r 1+ r
5 EM Wave Lab
7. Microwave Engineering
1. Smith chart
Input impedance
V0+ − jβz
Vs = Vo+ (e − jβz + Γe jβz ) and I s = (e − Γe jβz )
Z0
Z in Vs e − jβz + Γe jβz
zin = = = − jβz
Z0 Z0 I s e − Γe jβz
At z = −l
1 + Γe − j 2 βl 1+ | Γ | e j (φ − 2 βl )
zin = − j 2 βl
= j (φ − 2 βl )
1 − Γe 1− | Γ | e
7 EM Wave Lab
8. Microwave Engineering
1. Smith chart
Input impedance
Γ ⇒ Γe − j 2 βl
Clockwise angle of 2 βl on the Smith chart.
βl = π
one lap around the chart (l = 0.5λ )
8 EM Wave Lab
10. Microwave Engineering
2. Applications
VNA (Vector Network Analyzer)
Measurement equipment
Reflection coefficients
with frequency sweep
10 EM Wave Lab
11. Microwave Engineering
2. Applications
Representation of Smith chart
Z L = 25 + j 50Ω on a 50 - Ω line
z L = 0.5 + j1
r = 0.5 x = 1 ⇒ Point A
| Γ |≈ 0.62, φ ≈ 83
11 EM Wave Lab