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4434Mechanics source page
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Notes and instructional aids for Mechanics (Statics, Dynamics, Mechanics of Materials).Thu, 19 Jul 2001 00:00:00 -0700Strength of Materials
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A set of notes covering the contents of Mechanics of Materials at the junior level in engineering.Thu, 19 Jul 2001 00:00:00 -0700Apollo of Aeronautics: How NASA Changed the Future of Aircraft Energy Efficiency
https://www.merlot.org/merlot/viewMaterial.htm?id=582364
This is a webcast conducted by Mark Bowles at American Public University, where he talked about his latest book entitled the Apollo of Aeronautics. It describes NASA's role in developing fuel efficient technologies for commercial aircraft in the 1970s and 1980s.Fri, 16 Sep 2011 11:33:10 -0700Engineering Statics
https://www.merlot.org/merlot/viewMaterial.htm?id=89773
A set of notes covering the contents of Engineering Statics at the sophomore level in engineering.Wed, 18 Jul 2001 00:00:00 -0700Three dimensional elasticity solutions for plates
https://www.merlot.org/merlot/viewMaterial.htm?id=365142
A Navier-type method for finding the exact three-dimensional solution for isotropic thick and thin rectangular plates is presented. The extension of this procedure to the case of multilayered plates (composite structures) is straightforward and can be found in the listed references . The method presented in these lectures uses the Mixed Form of Hooke's Law (MFHL) which leads one to write the boundary conditions on the top and bottom surfaces of the plate directly in terms of transverse stresses. Mixed Form of Hooke's Law is obtained from the Classical Form of Hooke's Law (CFHL). The displacements, stresses and external loads are expressed by using trigonometric functions. It is possible to demonstrate that this particular choice satisfies the simply supported boundary conditions. The elasticity solution must satisfy the equilibrium equations, geometric relations and Hooke's law. After some mathematical derivations it is possible to demonstrate that a set of differential equations in the unknown amplitudes of the displacements and stresses has to be solved. An eigenvalue problem is obtained. Only 2 (over a total of 6) eigenvalues are distinct. Therefore, a basis of eigenvectors is not available and 2 generalized eigenvectors have to be found. The solution is a combination of the eigenvectors and generalized eigenvectors multiplied by functions of the out-of-plane coordinate z. The unknown constants of this combination are determined by imposing that the transverse stresses at the top and bottom surfaces of the plate must match the applied pressures. In a general multilayered structure additional conditions on the interlaminar continuity of the displacements and transverse stresses are required. Once the unknown coefficients are calculated, the elasticity solution is complete. These lectures present an algebraic solution for the particular case of a pressure applied at the top surface. The extension to the case of generic load can be obtained by using Fourier analysis. The lectures also present the FREE software that can be downloaded. The program calculates the amplitudes of the displacements and stresses for a sinusoidal load pressure applied at the top surface of the plate. The amplitude of the pressure distribution, material properties, geometric dimensions of the plate and wave numbers are inputs of the software.Thu, 5 Feb 2009 13:22:44 -0800A Semantic Data Grid for Satellite Mission Quality Analysis
https://www.merlot.org/merlot/viewMaterial.htm?id=967472
This video was recorded at 7th International Semantic Web Conference (ISWC), Karlsruhe 2008. The combination of Semantic Web and Grid technologies and architectures eases the development of applications that share heterogeneous resources (data and computing elements) that belong to several organisations. The Aerospace domain has an extensive and heterogeneous network of facilities and institutions, with a strong need to share both data and computational resources for complex processing tasks. One such task is monitoring and data analysis for Satellite Missions. This paper presents a Semantic Data Grid for satellite missions, where flexibility, scalability, interoperability, extensibility and efficient development have been considered the key issues to be addressed.Tue, 10 Feb 2015 12:35:52 -0800Airline Safety and the Electoral College
https://www.merlot.org/merlot/viewMaterial.htm?id=971543
This video was recorded at MIT World Series: Back to the Classroom 2005. Somehow Arnold Barnett manages to massage the subject of airline accidents into a breezy and sometimes comforting talk on statistical probabilities. In decades of research, he has taken firm hold of the metrics of measuring mortality in flight. While there are many ways of looking at the grim numbers, Barnett has developed his own preferred ratio, which looks at "death risk per randomly chosen flight." Applying this approach, Barnett has come up with very reassuring statistics: The death risk per flight on first world domestic jet services, for the period of 1990-1999, was 1 in 13 million. To the air averse, Barnett offers that "a citizen is 2.5 times as likely to win the jackpot of the Massachusetts state lottery as to perish on his or her next flight." For the four years between 2000 and 2004, there were zero accidental deaths in 70 million first world flights. Airline safety has tangibly improved, says Barnett. But security is another matter entirely: "We lost it all on a Tuesday in September," he says. While we've "brought accidents to the brink of extinction×´, we haven't solved our problems "dealing with the forces of evil." He strongly urges the reintroduction of positive passenger-baggage match, which he believes will deter terrorists who may use flawed explosive detection devices "as roulette wheels." As for fixing the Electoral College, which he likens to tilting at windmills, Barnett proposes applying a weighted average. This would "all but eliminate the worse consequences of the winner take all rule." The biggest drawback? "People have difficulty with mathematical ideas. And this sounds complicated."Tue, 10 Feb 2015 13:10:00 -0800Astronaut Lt. Colonel Michael Fincke Attends Reunion Via Space Link
https://www.merlot.org/merlot/viewMaterial.htm?id=972146
This video was recorded at MIT World Series: Technology Day 2004 Shifting Gears. Nothing could stop Mike Fincke (MIT '89) from joining his 15th reunion â€“ not even a 200-mile-high earth orbit. Fincke began a six-month stint as science officer and flight engineer on Expedition 9 to the International Space Station (ISS) in April 2004, and stole a few moments from his hectic schedule to greet fellow alumni. In addition to discussing the mission's science, which includes examining fluids in a microgravity environment, and working with tiny space satellites that might one day help astronauts perform routine maintenance, Fincke extols international collaboration on the ISS. "MIT set me up nicely to be ready for this next wave of globalizationâ€¦ Our Russian, European and Japanese partners will help expand human presence in the skies, on the way to the moon and stars."Tue, 10 Feb 2015 13:13:43 -0800Challenges in Cosmic Shear
https://www.merlot.org/merlot/viewMaterial.htm?id=976234
This video was recorded at NIPS Workshops, Sierra Nevada 2011. Recent observations have shown that the Universe is dominated by two mysterious components, Dark Matter and Dark Energy. Their nature pose some of the most pressing questions in fundamental physics today.Weak gravitational lensing, or 'cosmic' shear', is a powerful technique to probe these dark components. We will first review the principles of cosmic shear and its current observational status. We will describe the future surveys which will be available for cosmic shear studies. We will then highlight key challenges in data analysis which need to be met for the potential of these future surveys to be fully realised.Tue, 10 Feb 2015 13:47:42 -0800Demo
https://www.merlot.org/merlot/viewMaterial.htm?id=981916
This video was recorded at Thematic International Conference on Bio-, Nano- and Space Technologies, EU & Science Centers Collaboration, Ljubljana 2008. From 10 to 12 March 2008, the International Science and Technology Center (ISTC) and the Science and Technology Center in Ukraine (STCU) organised an international conference in Slovenia. The objective of the conference was to promote cooperation between partners in Europe and in Russia and the CIS, with a particular focus on three scientific fields: nano-, bio- and space technologies. The second day of the conference was dedicated to space. Space activities in Europe, Russia and the CIS, as well as joint projects were presented.Tue, 10 Feb 2015 14:35:05 -0800