uncleflo
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MIT OCW - 2.972 How a Hydrofoil Works
Saved by uncleflo on February 12th, 2022.
The rquirement is to lift the boat's hull outside the water. Hydrofoil (It is a foil or wing under water used to lift the boat's hull until it is totally outside the water.) Explanation: 1. At low speeds the hull (body of ship) sits in the water and the hydrofoils are totally submerged in the water. 2. As the boat's speed increases, the hydrofoils create lift. 3. At a certain speed, the lift produced by the hydrofoils equals the sum of of the boat and cargo weights. Therefore the hull comes out of the water. 4. Instead of having an increase in drag with increasing speed because the hull is lifted out of the water (contrary to what happens in traditional boats due to pressure drag), the hydrofoils provide a more efficient way of cruising. Decreasing the drag contributes to the better use of the power needed for the movement of the boat.
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An Introduction to the Physics of Sailing | MIT BLOSSOMS
Saved by uncleflo on January 20th, 2021.
The goal of this lesson is to explain how sailboats work by exploring basic physics principles. At the end of this lesson, students will be able to identify the forces acting on a sailboat and explain how the combination of these forces results in the forward motion of a sailboat. Students should be familiar with vectors and be able to use them to represent forces and moments, and also should be familiar with using free body diagrams to represent forces and moments. A basic understanding of fluid flow and/or resistance might be helpful, but not necessary. This lesson and the follow-on assessment will each take about one hour to complete. Students only need pen/pencil and paper to complete the activities in the lesson, although an optional activity where students make their own sailboats would require additional materials. The classroom activity challenges are centered around small-group discussions based on the questions posed before each break. Free body diagrams, or another conceptual representation of his or her answer, should support each student’s solution to the questions posed in the video. Instructions for the option of having students design their own sailboats as part of this lesson can be found here: https://tryengineering.org/teacher/sail-away/
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MIT App Inventor
Saved by uncleflo on April 10th, 2016.
MIT App Inventor is an innovative beginner's introduction to programming and app creation that transforms the complex language of text-based coding into visual, drag-and-drop building blocks. The simple graphical interface grants even an inexperienced novice the ability to create a basic, fully functional app within an hour or less. Follow these simple steps to build your first app. Step-by-step guides show you how to build all kinds of apps. Teachers, find out about curriculum and teaching resources. Join community forums to get answers to your questions.
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Nonlinear Systems Laboratory Homepage
Saved by uncleflo on April 5th, 2015.
The Nonlinear Systems Laboratory is headed by Professor Jean-Jacques Slotine. Members and affiliates. Videos of Some of Our Research. Books. Journal Articles.
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Exceptionally high Young's modulus observed for individual carbon nanotubes
Saved by uncleflo on April 4th, 2015.
CARBON nanotubes are predicted to have interesting mechanical properties—in particular, high stiffness and axial strength—as a result of their seamless cylindrical graphitic structure1–5. Their mechanical properties have so far eluded direct measurement, however, because of the very small dimensions of nanotubes. Here we estimate the Young's modulus of isolated nanotubes by measuring, in the transmission electron microscope, the amplitude of their intrinsic thermal vibrations. We find that carbon nanotubes have exceptionally high Young's moduli, in the terapascal (TPa) range. Their high stiffness, coupled with their low density, implies that nanotubes might be useful as nanoscale fibres in strong, lightweight composite materials.
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Buzz Aldrin
Saved by uncleflo on September 2nd, 2014.
Selected by NASA in 1963 into the third group of astronauts, Aldrin was the first with a doctorate and became known as “Dr. Rendezvous.” The docking and rendezvous techniques he devised for spacecraft in Earth and lunar orbit became critical to the success of the Gemini and Apollo programs, and are still used today. He also pioneered underwater training techniques, as a substitute for zero gravity flights, to simulate spacewalking. In 1966 on the Gemini 12 orbital mission, Buzz performed the world’s first successful spacewalk, overcoming prior difficulties experienced by Americans and Russians during extra-vehicular activity (EVA), and setting a new EVA record of 5 ½ hours. On July 20, 1969, Buzz and Neil Armstrong made their historic Apollo 11 moonwalk, becoming the first two humans to set foot on another world. They spent 21 hours on the lunar surface and returned with 46 pounds of moon rocks.
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Bifurcation buckling, Stability and Buckling
Saved by uncleflo on September 2nd, 2014.
Now consider the case of compressive loads and the instability they can cause. Consider only static instabilities (static loading as opposed to dynamic loading [e.g., flutter]) "A system becomes unstable when a negative stiffness overcomes the natural stiffness of the structure." Review some of the mathematical concepts. Limit initial discussions to columns.
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Euler-Bernoulli Beams: Bending, Buckling, and Vibration
Saved by uncleflo on September 2nd, 2014.
Euler-Bernoulli Beams: Bending, Buckling, and Vibration. 2.002 Mechanics and Materials II Department of Mechanical Engineering MIT February 9, 2004
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Stresses in Beams, David Roylance, MIT
Saved by uncleflo on September 2nd, 2014.
Understanding of the stresses induced in beams by bending loads took many years to develop. Galileo worked on this problem,but the theory as we use it today is usually credited principally to the great mathematician Leonard Euler (1707{1783). As will be developed below, beams develop normal stresses in the lengthwise direction that vary from a maximum in tension at one surface, to zero at the beam's midplane, to a maximum in compression at the opposite surface. Shear stresses are also induced, although these are often negligible in comparision with the normal stresses when the length-to-height ratio of the beam is large.
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Isotropic Linear Elastic Stress Concentration, Massachusetts Institute of Technology
Saved by uncleflo on September 2nd, 2014.
The primary objectives of this lab are to introduce the concept of stress and strain concentration factors in notched structural configurations. The notion of stress concentration is experimentally explored qualitatively, using photoelasticity, and quantitatively, using experimental, analytical, and numerical methods. 2.002 Mechanics and Materials II, Spring 2004
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MIT 3.320 Atomistic Computer Modeling of Materials - YouTube
Saved by uncleflo on May 30th, 2014.
This course uses the theory and application of atomistic computer simulations to model, understand, and predict the properties of real materials. Specific topics include: energy models from classical potentials to first-principles approaches; density functional theory and the total-energy pseudopotential method; errors and accuracy of quantitative predictions: thermodynamic ensembles, Monte Carlo sampling and molecular dynamics simulations; free energy and phase transitions; fluctuations and transport properties; and coarse-graining approaches and mesoscale models. The course employs case studies from industrial applications of advanced materials to nanotechnology. Several laboratories will give students direct experience with simulations of classical force fields, electronic-structure approaches, molecular dynamics, and Monte Carlo.
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Lecture 1 | MIT 6.832 Underactuated Robotics, Spring 2009 - YouTube
Saved by uncleflo on May 29th, 2014.
A really good course on directly uncontrolled movement. Uploaded on Jul 14, 2010. Lecture 1: Introduction. Instructor: Russell Tedrake. See the complete course at: http://ocw.mit.edu/6-832s09
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Courses | MIT OpenCourseWare | Free Online Course Materials
Saved by uncleflo on February 8th, 2014.
MIT OpenCourseWare makes the materials used in the teaching of almost all of MIT's subjects available on the Web, free of charge. With more than 2,200 courses available, OCW is delivering on the promise of open sharing of knowledge.
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Adrian Dalca personal webpage
Saved by uncleflo on October 22nd, 2012.
I am a graduate student at MIT, advised by Dr. Polina Golland. My main research work is on algorithm development in medical imaging analysis. I've also been very fortunate to work in Bioinformatics with professor Michael Brudno at UofT and in geophysics with professor Jerry Mitrovica at UofT. My wife is also at MIT, and you'd surely be enriched by visiting her webpage (I mean, come on, how many bio students have a webpage anyway?).
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