DIY Skylights From Used Water Bottles Replace 50-Watt Bulbs Image via YouTube video An ingenious invention by an engineer in Brazil has made an enormous difference in his town. Simply placing a bottle of water in a hole in the ceiling can light up a room with the same brightness as a 50-watt light bulb! Residents have better lighting and are using less electricity. >> WATCH SLIDESHOW: 13 Really Cool Lighting Ideas (Slideshow) I think the part that made it most convincing was the bucket comparison -- when they took the buckets off the bottles to show what a difference they make in lighting the room, my jaw dropped open. While it's obvious that these only work for certain types of structures, and only provide extra light when the sun is out, it shows that you don't have to construct a complex skylight in your roof to get some daylight into your home. And to hear that the bottles are lasting years without needing any maintenance at all is exciting. What a great bottle-reuse-zero-electricity idea! UPDATE: The project is being called Liter of Light.
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.
Air Safety Institute - Library Expand your knowledge by choosing from the Air Safety Institute's wide selection of publications; available to pilots free of charge. CFI to CFI Newsletters Both pilots and instructors will benefit from the Air Safety Institute's quarterly newsletter to instructors. Safety Advisors Find need-to-know information and a wealth of practical advice in the Air Safety Institute's Safety Advisors. Safety Briefs Safety Briefs are short (2-4 page) publications designed to offer expert guidance and useful tips for pilots. VFR into IMC Syllabus This syllabus is designed to help protect pilots against GA's most fatal type of weather-related accident: VFR into IMC. Nall Report This acclaimed annual safety report provides perspective to the previous year's general aviation accident statistics. Special Reports Get straightforward analysis—based on accident reports in the Air Safety Institute Accident Database—of challenges to aviation safety. Airspace at-a-Glance Card Intercept Procedures Card Flight Planner Form
Interesting High-speed Video Clips 35 Years at the National Air and Space Museum When I began to work at the National Air and Space Museum in March 1975, I was the Museum’s sole reference librarian, having graduated from Catholic University of America with an M.S. in Library Science the previous year. I had only been working for a few weeks, when I was told that we’d be moving from our Arts and Industries Building location to a brand new facility down the street. My boss, a professional of some standing in the librarian community, knew her job well, but she didn’t know much about moving a library, so it was up to me and one of my stalwart colleagues, a guy named Bill Jackson, whom some old-timers will remember fondly, to figure out how to box everything up and move it less than a city block away. Rocket Row along the west side of the Arts and Industries Building before the National Air and Space Museum was built. The day was set in May 1975 for the production of the moth crystal packets. An evening in July was chosen for the move. Dominick A.
Flight Training: January 2010Features By: Rob Krajcik “There is an art, it says, or, rather, a knack to [landing an airplane]. The knack lies in learning how to throw yourself at the ground and miss.”—Life, the Universe and Everything Landing tips I learned from my (virtual and real) flight instructors: Adjusting your seat to the same sight picture every time can make a big difference. Douglas Adams’ words from one of his most celebrated science fiction novels, while originally referring more broadly to flying, sum up many students’ feelings on landing perfectly. The FAA safety program has an online library of documents and videos. Rob Krajcik is a student pilot and basic ground instructor. A Sense of Scale: Absolute Zero By Glenn Elert Posted 01.08.08 NOVA At roughly minus 460°F, absolute zero is abysmally cold, yet at least we can imagine it. Being only a few hundred degrees below zero, it's in the realm of something we can put our minds around. Launch Interactive Travel from absolute zero to what may be the highest temperature of all. This feature originally appeared on the site for the NOVA program Absolute Zero. Glenn Elert is Research Coordinator and Webmaster for the Physical Science Department of Midwood High School at Brooklyn College. Images (graphics) © WGBH Educational Foundation
Ten things you don’t know about black holes Well, they’re black, and they’re like bottomless holes. What would you call them? -Me, when a friend asked me why they’re named what they are Ah, black holes. But then, that’s why I’m here. So below I present ten facts about black holes — the third in my series of Ten Things You Don’t Know (the first was on the Milky Way; the second about the Earth). 1) It’s not their mass, it’s their size that makes them so strong. OK, first, a really quick primer on black holes. The most common way for a black hole to form is in the core of a massive star. As the core collapses, its gravity increases. The region around the black hole itself where the escape velocity equals the speed of light is called the event horizon. OK, so now you know what one is, and how they form. So there you go. 2) They’re not infinitely small. So OK, they’re small, but how small are they? What happens to the core? Out here, we’ll never know for sure. It will continue to collapse, and the gravity increases. 3) They’re spheres.
Qualification radio, le Language Proficiency (LP) Pour qu'une licence de pilotage soit valable en Europe, la qualification radio doit être assortie d'un Language Proficiency (LP) de Level 4 (au moins) dans la langue que l'on va utiliser pour les échanges à la radio. Jusqu'à présent, la Suisse faisait figure d'exception en n'exigeant pas de LP pour les pilotes VFR sur son territoire. L'implémentation à venir du règlement EASA laisse toutefois présager la fin prochaine de cette exception pour les pilotes d'avion et d'hélicoptère, ce qui signifie que ces licences de pilotage ne seront plus du tout valables sans au moins un LP level 4, quelle que soit la langue. Lorsque l'on obtient une qualification radio dans sa langue maternelle, on reçoit automatiquement un LP level 6 (durée illimitée) sans avoir à passer d'examen complémentaire. Lorsque l'on obtient une qualification radio dans une autre langue, ici l'anglais, on doit passer alors un Language Proficiency Check (LPC) pour obtenir un LP Level 4, valable 4 ans. Préparation Conclusion
Cell Size and Scale Some cells are visible to the unaided eye The smallest objects that the unaided human eye can see are about 0.1 mm long. That means that under the right conditions, you might be able to see an ameoba proteus, a human egg, and a paramecium without using magnification. A magnifying glass can help you to see them more clearly, but they will still look tiny. Smaller cells are easily visible under a light microscope. It's even possible to make out structures within the cell, such as the nucleus, mitochondria and chloroplasts. To see anything smaller than 500 nm, you will need an electron microscope. Adenine The label on the nucleotide is not quite accurate. How can an X chromosome be nearly as big as the head of the sperm cell? No, this isn't a mistake. The X chromosome is shown here in a condensed state, as it would appear in a cell that's going through mitosis. A chromosome is made up of genetic material (one long piece of DNA) wrapped around structural support proteins (histones). Carbon
Examen OACI FCL 1.028 et FCL 1.200 First 3D Map of the Brain’s Connections We knew anatomy could be gorgeous, but this is beyond anything else we’ve ever seen, and it’s guaranteed to be something you haven’t seen, being the first 3D image of a brain’s connections. Van Wedeen, a Harvard radiology professor, is awestruck: “We’ve never really seen the brain – it’s been hiding in plain sight.” Conventional scanning has offered us a crude glimpse, but scientists such as Wedeen aim to produce the first ever three-dimensional map of all its neurons. They call this circuit diagram the “connectome”, and it could help us better understand everything from imagination and language to the miswirings that cause mental illness. Photographed above is the 3D image of an owl-monkey’s brain. Link [via]
Séminaire sur le thème du patrimoine historique d'Air France Le 2 décembre, un séminaire réunissant des cadres dirigeants d'Air-France, des responsables du musée Air-France, des membres de l’association des anciens d'Air Inter et de l’amicale d’Air France, a été organisé par Air France en partenariat avec l’Institut national du patrimoine, sur le thème "Le patrimoine historique d’Air France". Ce séminaire s’inscrit dans le cadre de la convention conclue entre l’Inp et Air France en novembre 2010. Consulter le programme de cette journée (PDF) Lire aussi Chantier école au musée Théodore Monod d’art africain de DakarGrâce au soutien de la compagnie Air France et en coopération avec l’Institut Fondamental d’Afrique Noire (IFAN), l’Ecole du Patrimoine Africain (EPA), le musée des arts et traditions populaires de Libreville (Gabon) et le musée d’Angoulême, un chantier école a été organisé au musée Théodore Monod d’art africain de Dakar du 6 au 17 juin 2011.