Beginner's Guide to Aerodynamics. At this Web site you can study aerodynamics at your own pace and to your own level of interest. Some of the topics included are: Newton's basic equations of motion; the motion of a free falling object, that neglects the effects of aerodynamics; the terminal velocity of a falling object subject to both weight and air resistance; the three forces (lift, drag, and weight) that act on a glider; and finally, the four forces that act on a powered airplane. Because aerodynamics involves both the motion of the object and the reaction of the air, there are several pages devoted to basic gas properties and how those properties change through the atmosphere.
This site was created at NASA Glenn as part of the Learning Technologies Project (LTP). It is currently supported by the Aeronautics Research Mission Directorate at NASA HQ through the Educational Programs Office at NASA Glenn. There is a special section of the Beginner's Guide which deals with compressible, or high speed, aerodynamics. Graphene is Next. Valkyrie Ice Graphene. If you’ve never heard about it, don’t worry, a lot of people haven’t, because it’s really only been “discovered” relatively recently, and most of the truly interesting news about it has been in the last year.
The amazing thing is that we’ve actually been using it for centuries, in the form of the common pencil. Graphene is a form of carbon, much like carbon nanotubes and other fullerenes, with one major difference. While fullerenes are 3D structures of carbon atoms, graphene is a flat sheet. By now, most of you are familiar with carbon nanotubes, a.k.a. But that isn’t all. All of these properties make graphene a very important material for the future of electronics. Let’s think about that for a moment. That’s a jump of two or three orders of magnitude up the exponential curve, my friends, especially when you combine it with the advances in multi-core technology and parallel computing.
And science will not be the sole benefactor.
Nanotechnology. Math. Robotics. Science and Physics. Silica Aerogel (TEOS, Base-Catalyzed) Editor’s Note: This is an adaptation of the silica aerogel procedure from the Lawrence Berkeley National Laboratory site about aerogels, which for a long time was the only procedure for making aerogels publicly available. That procedure, we’re sorry to say, does not work. Maybe you’ve tried it.
If you have, you’ll have noticed that the solution stays separated as two layers and a gel never forms. That’s because there’s not enough alcohol. Maybe it was a typo. So we modified that procedure and present the modified version that works for us below. Materials Tetraethoxysilane (tetraethyl orthosilicate), Si(OC2H5)4Absolute (200-proof) ethanolDeionized waterAmmonium hydroxide, 28-30 wt % in waterAmmonium fluoride, NH4FOptionalAcetone Gel Preparation An Excel calculator for determining amounts of chemicals required by target volume (mL) or mass (g) is available.
Weigh 1.852 g NH4F and add it to 100 mL of water. What Everything Does TEOS is the source of the silica. What Doesn’t Work Ethanol: Richard Dawkins (BBC Documentary) - WWW.OLOSCIENCE.COM.