Mechanical Principles (1930) by Ralph Steiner [4min selection]

The Second Law and Energy (second law event) 10/05/2007 1:00 PM Broad InstituteSteven Chu, Secretary of EnergyDescription: This Nobel Prize"winning scientist admits to staying up late the night before his talk to bone up on thermodynamics. He puts his research to good use, discussing the history and application of the laws of thermodynamics, which have served as "the scientific foundation of how we harness energy, and the basis of the industrial revolution, the wealth of nations." Taking Watt's 1765 steam engine, Stephen Chu illustrates basic principles of thermodynamics -- that energy is conserved, that you can do work from heat, especially when you maximize the difference in temperature in the system and minimize heat dissipation from friction. Chu offers another form of the laws: You can't win; you can't break even; and you can't leave the game. The game hasn't changed all that much in the past few centuries. credit MIT World -- special events and lectures license MIT TechTV

Robotics Robotics is the branch of mechanical engineering, electrical engineering and computer science that deals with the design, construction, operation, and application of robots,[1] as well as computer systems for their control, sensory feedback, and information processing. These technologies deal with automated machines that can take the place of humans in dangerous environments or manufacturing processes, or resemble humans in appearance, behavior, and/or cognition. Many of today's robots are inspired by nature contributing to the field of bio-inspired robotics. The concept of creating machines that can operate autonomously dates back to classical times, but research into the functionality and potential uses of robots did not grow substantially until the 20th century.[2] Throughout history, robotics has been often seen to mimic human behavior, and often manage tasks in a similar fashion. Etymology[edit] History of robotics[edit] Robotic aspects[edit] Components[edit] Power source[edit]

Product Search | Monnit Corp. Description: Imminent danger of CO poisoning is a growing concern in the care for elderly, child and immuno-compromised individuals. Monnit’s wireless sensor platform and online monitoring software provide a very affordable, simple-to-setup, feature rich solution that helps meet the growing demand of legislative and public concerns regarding the monitoring of gas leaks and emissions. The mems based wireless carbon monoxide sensor allows you to monitor the level of carbon monoxide (CO) gas in the surrounding air. Mad4One Handle Saddle Trial Competition Finish - 99.00EUR : Unaruota.com the number one Producer of high-end Unicycles and Unicycle-Spareparts, Unicycles and Unicycle spareparts, the State of the Art of unicycling Here the HandleSaddleBASE by Mad4One Designed for Trial, Flat and Street Material Aluminium AL6061-T6, black anodisiert Fits for standard seat post delivered with 4 M6 screws Weight: 390 gr (incl. screws) Officially named the Handle Saddle BASE. It is the New Generation of saddle developed by Mad4One for Trials, Flat and Street - also an interesting new option for Race and Muni. Thanks to its innovative design, the seat offers a much stronger and safer grip than traditional saddles. The Handle Saddle BASE should be your starting point .... Sketch for the cover 1:1

General relativity General relativity, or the general theory of relativity, is the geometric theory of gravitation published by Albert Einstein in 1916[1] and the current description of gravitation in modern physics. General relativity generalizes special relativity and Newton's law of universal gravitation, providing a unified description of gravity as a geometric property of space and time, or spacetime. In particular, the curvature of spacetime is directly related to the energy and momentum of whatever matter and radiation are present. The relation is specified by the Einstein field equations, a system of partial differential equations. Some predictions of general relativity differ significantly from those of classical physics, especially concerning the passage of time, the geometry of space, the motion of bodies in free fall, and the propagation of light. Einstein's theory has important astrophysical implications. History[edit] Albert Einstein developed the theories of special and general relativity.

SPIDER CONCEPT These are a few example inputs and the resulting coupler curves as described by the relationships in the enable text of the Klann linkage. The inputs and resulting outputs are displayed in the tables next to each graph. The yellow curves trace out the path of each of the points through one complete revolution of the crank. The dimensions are unitless as the linkage is entirely mechanical and can be scaled up or down. Enable001 – These inputs are the ones used in the four figures above and shown in figure 2 of the enable text. Attack on the pentagon results in discovery of new mathematical tile | Science In the world of mathematical tiling, news doesn’t come bigger than this. In the world of bathroom tiling – I bet they’re interested too. If you can cover a flat surface using only identical copies of the same shape leaving neither gaps nor overlaps, then that shape is said to tile the plane. Every triangle can tile the plane. Things get interesting with pentagons. The hunt to find and classify the pentagons that can tile the plane has been a century-long mathematical quest, begun by the German mathematician Karl Reinhardt, who in 1918 discovered five types of pentagon that do tile the plane. (To clarify, he did not find five single pentagons. Most people assumed Reinhardt had the complete list until half a century later in 1968 when R. That same year an unlikely mathematical pioneer entered the fray: Marjorie Rice, a San Diego housewife in her 50s, who had read about James’ discovery in Scientific American. But then the hunt went cold. I blog here about maths.

China Koowheel 2018 Fashion Smart Hovershoes Self Balancing Single Wheel Electric Skateboard - China Hovershoes, Hoverboard Koowheel 2018 Fashion Smart Hovershoes Self Balancing Single Wheel Electric Skateboard Product Description Koowheel hovershoes YouTube video address: Product Description: Model: Hovershoes Battery power: 54Wh/each Motor power :250 watts/each Load range :10-80KG/22-176lbs Full charge range: 8km Max speed :8km/h Max Permissible gradient: 9° Working temperature: -10 to 40ºC Waterproof :IP65 Charging input :AC100-220V Charging output: 29.4V* 1A Full charge time :1.5H N.W :2.8kg/each Tire outer diameter: 3.5inch Why choose us : 1. OEM & ODM welcome! Contact info: Koowheel No.1 Hoverboards Manufacturer in China Koowheel 0 Safety Accidents Koowheel<0.3% Defective rate Our Services We have repair centers in Los Angeles,New York,Germany,UK,Australia to do after sales service!! 1. 2. 3. 4.

Physics World reveals its top 10 breakthroughs for 2011 The two physics stories that dominated the news in 2011 were questions rather than solid scientific results, namely "Do neutrinos travel faster than light?" and "Has the Higgs boson been found?". However, there have also been some fantastic bona fide research discoveries over the last 12 months, which made it difficult to decide on the Physics World 2011 Breakthrough of the Year. But after much debate among the Physics World editorial team, this year's honour goes to Aephraim Steinberg and colleagues from the University of Toronto in Canada for their experimental work on the fundamentals of quantum mechanics. Using an emerging technique called "weak measurement", the team is the first to track the average paths of single photons passing through a Young's double-slit experiment – something that Steinberg says physicists had been "brainwashed" into thinking is impossible. We have also awarded nine runners-up (see below). 1st place: Shifting the morals of quantum measurement

Recognition of Finger Motions for Myoelectric Prosthetic Hand via Surface EMG 1. Introduction Recently, myoelectric prosthetic arms/hands, in which arm/hand gesture is distinguished by the identification of the surface electromyogram (SEMG) and the artificial arms/hands are controlled based on the result of the identification, have been studied (Weir, 2003). The SEMG has attracted an attention of researchers as an interface signal of an electric actuated arm for many years, and many of studies on the identification of the SEMG signal have been executed. Nowadays, it can be said that the SEMG is the most powerful source of control signal to develop the myoelectric prosthetic arms/hands. From the 1970s to the 1980s, elementary pattern recognition technique such as linear discriminant analysis, was used for the identification of the SEMG signals in (Graupe et al., 1978) and (Lee et al., 1984). The amplitude and the frequency band are typical information extracted from the SEMG signal, which can be used for the identification of arm/hand gesture. 2. Figure 1. 2.1. 3.

Scrollitelling : quel outil pour vos récits multimédias immersifs ? Un an après Snow Fall, les formats multimédias immersifs (parfois baptisés « scrollitelling ») se multiplient sur les sites de presse, et des outils commencent à apparaître pour épauler les journalistes. Plateformes wysiwyg, extensions WordPress, scripts open source à coder : voici un panorama des solutions disponibles à ce jour. ↑1 » Les plateformes en ligne Pas besoin de mettre les mains dans le code… ou si peu. Scrollkit C’est actuellement la plateforme gratuite la plus aboutie. La fonctionnalité la plus puissante de Scrollkit est son module Skrollr, qui gère les effets de parralaxe de façon plutôt intuitive (à condition de connaître un peu de CSS). La plateforme gère de façon imparfaite le responsive design pour l’affichage mobile, mais ce problème est réglable : le grand point fort de Scrollkit est en effet la possibilité d’exporter le projet en fichier HTML, et de le personnaliser à l’envie – sans aucune dépendance aux serveurs du service. Shorthand Creatavist Racontr Mais aussi… sStory

This Electric Scooter Suitcase Is the Lazy Traveling Man's Dream Bag Ride into the future...with zero effort. Even with all of our technological advancements in 2016, there's one thing we still have yet to figure out: How to make airports suck less. Security, delays, overpriced snacks, and more are all awful, but that doesn't even begin to scratch the surface of how terrible it is to carry a bag around while walking across a terminal. The rolling suitcase has helped, but it wasn't until now that the burden of suitcase carrying was completely eliminated. Enter Modobag, which is a suitcase that is also literally an electric scooter. That's right—you can now ride your suitcase around the airport. Modobag was founded by a Chicago businessman and has currently raised over $150,000 of its $50,000 goal on Indiegogo.com. That's the thing: Nothing about this looks cool.