Euclidean geometry | Descriptive geometry
The Rytz’s axis construction is a basic method of descriptive geometry to find the axes, the semi-major axis and semi-minor axis and the vertices of an ellipse, starting from two conjugated half-diameters. If the center and the semi axis of an ellipse are determined the ellipse can be drawn using an ellipsograph or by hand (see ellipse). Rytz’s construction is a classical construction of Euclidean geometry, in which only compass and ruler are allowed as aids. The design is named after its inventor David Rytz of Brugg (1801–1868). Conjugate diameters appear always if a circle or an ellipse is projected parallelly (the rays are parallel) as images of orthogonal diameters of a circle (see second diagram) or as images of the axes of an ellipse. An essential property of two conjugate diameters is: The tangents at the ellipse points of one diameter are parallel to the second diameter (see second diagram). (Wikipedia).
Annual Research Symposium, 2021
On May 12, 2021 the Fortunoff Video Archive hosted their annual research symposium, featuring the work of our four fellows and senior scholars. Presentations include: Chad Gibbs, Dori Laub Fellow Survival and Witnessing at Treblinka: Toward Place-Based Definitions of Holocaust Survivorsh
From playlist Fortunoff Video Archive for Holocaust Testimonies
Why Michael Keaton is Building a Factory
Michael Keaton is swapping the glamour of Hollywood for the not quite so glitzy world of construction. Yes, really. For more by Tomorrow’s Build subscribe now - https://bit.ly/3vOOJ98 Executive Producer and Narrator - Fred Mills Producer - Adam Savage Video Editing and Graphics - Thomas C
From playlist Tomorrow's Build
Systems Architecture, Kabuki Capitalism, and the Economic Manhattan Project
(April 29, 2009) Eric Weinstein
From playlist Engineering
Louis-Clément-Lefevre: Representation varieties of fundamental groups of complex algebraic...
We study locally the representation varieties of fundamental groups of smooth complex algebraic varieties. These are schemes whose complex points parametrize such representations into linear algebraic groups. At a given representation, the structure of the formal local ring to the represen
From playlist Topology
Victor Gayral: From equivariant quantization to locally compact quantum group ...
Full Title: From equivariant quantization to locally compact quantum group via deformation of C*-algebras The goal of this talk is to explain how non-formal equivariant quantization gives rise to a theory of deformation of C*-algebras and to concrete examples of locally compact quantum gr
From playlist HIM Lectures: Trimester Program "Non-commutative Geometry and its Applications"
Anne Lonjou: Action of the Cremona group on a CAT(0) cube complex
CIRM VIRTUAL EVENT Recorded during the meeting"Virtual Geometric Group Theory conference " the May 20, 2020 by the Centre International de Rencontres Mathématiques (Marseille, France) Filmmaker: Guillaume Hennenfent Find this video and other talks given by worldwide mathematicians on CIRM
From playlist Virtual Conference
Modulo p Representations of GL_2 (K) (Lecture 2) by Benjamin Schraen
Program Recent developments around p-adic modular forms (ONLINE) ORGANIZERS: Debargha Banerjee (IISER Pune, India) and Denis Benois (University of Bordeaux, France) DATE: 30 November 2020 to 04 December 2020 VENUE: Online This is a follow up of the conference organized last year arou
From playlist Recent Developments Around P-adic Modular Forms (Online)
P. Castillon - CAT(k)-spaces 2 (version temporaire)
The purpose of this course is to introduce the synthetic treatment of sectional curvature upper-bound on metric spaces. The basic idea of A.D. Alexandrov was to characterize the curvature bounds on the sectional curvature of a Riemannian manifold in term of properties of its distance funct
From playlist Ecole d'été 2021 - Curvature Constraints and Spaces of Metrics
Dubai and Moscow's Moving Skyscrapers
NOTE: I did not make this video. It is the video produced by the architectural firm behind this building. -- David Fisher's company 'Dynamic Architecture' have developed a moving skyscraper! The building will be made up of 80 floors, with an apartment on each floor. The rotating bui
From playlist Architecture
The World's Tallest Timber Buildings
As a new generation of timber towers are rising ever higher into the sky we countdown the five tallest timber skyscrapers. For more videos by The B1M subscribe now - http://ow.ly/GxW7y Read the full story on this video, including images and useful links, here: http://www.theb1m.com/video
From playlist The World's...
Mankind has been building skyscrapers and similar tall buildings for decades now. 👷👨🏭 Ever wonder how those sky-piercing buildings withstand high-winds without falling over or how they are built so fast? ⏱ In this video, you will learn how skyscrapers are built and how skyscrapers came
From playlist Engineering Wonders
Embedded Recipes 2018 - Shared memory and telemetry - Yves-Marie Morgan
To exchange data between processes without the overhead of locking/syscall, shared memory can be used. libshdata/telemetry offers a lock free circular buffer with timestamped data chunks to handle some typical uses cases found in drones: One process for flying stack, and one a more proce
From playlist Embedded Recipes 2018
Denis Roze - Quantifying the evolutionary advantage of recombination infinite populations
One of the most widely cited hypotheses to explain the evolutionary maintenance of sex and recombination states that recombination increases the efficiency of natural selection by reducing interference among selected loci. Until recently, this possible benefit of re-combination was quanti˝
From playlist [T1 2022] Workshop - Mathematical models in ecology and evolution - March 21st to 25th, 2022
The World's Tallest Skyscrapers Aren't Really That Tall
Thanks to Pepperonin for supporting us on Patreon and making this video possible! Support us here: http://bit.ly/2qBHc Having the title of world's tallest skyscraper is an exemplary achievement for developers across the world. Ever since man started to build up, we've been competing to se
From playlist Concerning Engineering
In 2002, Ned Kahn worked with the staff of Technorama, the major science center in Switzerland, and their architects, Durig and Rami, to create a facade for the building which is composed of thousands of aluminum panels that move in the air currents and reveal the complex patterns of turbu
From playlist Staff Favorites
Is modular construction the future? | Hard Reset by Freethink
Is modular construction the future of buildings? Subscribe here: http://freeth.ink/youtube-subscribe-modularconstruction We live in a world surrounded by homes, shopping centers, and office buildings built to withstand the test of time, but there’s a problem with this focus on permanence
From playlist Freethink: Hard Reset
12 Most Amazing Bridges Ever Built
People may cross bridges everyday to get to work, some boring and some simply amazing, here are 12 of the most amazing bridges ever built! Subscribe for weekly wacky videos and learn interesting facts about the world with awesome top 10 lists and other amazing videos. 7 – Storseisundet B
From playlist Bridge Building
Denis Monasse : Sur la création de livres numériques
Find this video and other talks given by worldwide mathematicians on CIRM's Audiovisual Mathematics Library: http://library.cirm-math.fr. And discover all its functionalities: - Chapter markers and keywords to watch the parts of your choice in the video - Videos enriched with abstracts, b
From playlist Mathematical Aspects of Computer Science
Quick Build: Cubicle Wall Planter
I haven't disappeared! In fact I have quite a few cool projects in the works and not just woodworking. Follow me on instagram to keep up with what I'm working on (@gradyhillhouse). Here's a quick video for all my fellow office drones. My employer is generously hooking us up with standing
From playlist Woodworking Projects