SmartGrids: European Technology Platform
pochekailov - Программы для работы с литературой
Среди прочего, все ученые работают с литературой. Они ее читают (sic!), а когда пишут статьи, обзоры или книги - то ссылаются на источники. В науке не принято пользоваться агенством ОБС, здесь все четко: если что-то утверждаешь, будь добр, приведи основания, почему ты это пишешь. Либо дай ссылку на того, кто обнаружил факт до тебя, либо опиши, что ты сделал, чтобы убедится в верности твоего утверждения. На этом построена вся наука: факты не берутся с потолка, а подтверждаются многократно повторенным опытом. В типичной статье бывает как правило от 10 до 50 ссылок, в обзоре какой-либо темы - до 200-300. Я для этого пользуюсь старой проеренной системой, на которой основан BibTeX (это пакет для библиографии в LaTeX). Конечно, делать это вручную было бы сущим адом. Во-первых, тот же BibTeX. Конечно, базу данных вручную тоже делать сложновато. Вот как этот JabRef выглядит с открытой в нем базой данных: Другая популярная система - Zotero.
Les quatre éléments
Les solutions de gestion de l'énergie et d'éclairage devraient conduire l'industrie, alors que les systèmes de chauffage, ventilation et climatisation continueront de jouer un rôle important Le marché européen des systèmes immotiques récupère de la crise à laquelle il a fait face en 2009 à cause de la récession. Bien que ce rétablissement soit dynamique, le marché doit encore se stabiliser et développer des opportunités de croissance dans les régions émergentes et les segments utilisateurs. En attendant, les exigences en matière d'efficacité énergétique et le soutien législatif des directives de l'UE seront de grands conducteurs du marché. Selon une nouvelle étude de Frost & Sullivan intitulée « Marché européen des systèmes immotiques » (buildingtechnologies.frost.com), ce marché a généré 1 769,5 millions de dollars en 2010 et devrait atteindre 2 123,6 millions de dollars en 2017.
Global Climate Change: Research Explorer
The earth’s climate has warmed and cooled for millions of years, since long before we appeared on the scene. There’s no doubt that the climate is growing warmer currently; indications of that change are all around us. Though climate change isn’t new, the study of how human activity affects the earth’s climate is. The exploration of climate change encompasses many fields, including physics, chemistry, biology, geology, meteorology, oceanography, and even sociology. At this Web site, you can explore scientific data relating to the atmosphere, the oceans, the areas covered by ice and snow, and the living organisms in all these domains.
PowerMeter - Save Energy. Save Money. Make a Difference.
We launched Google PowerMeter as a free energy monitoring tool to raise awareness about the importance of giving people access to their energy information. PowerMeter included key features like visualizations of your energy usage, the ability share information with others, and personalized recommendations to save energy. We partnered with device manufacturers and utilities around the world. Many of our partners now have new options available for accessing energy information. We are pleased that PowerMeter helped demonstrate the importance of access to energy information, and created a model for others. We retired the service on September 16, 2011. We continue to see encouraging results about the importance of access to energy data. Momentum is building toward making energy information more readily accessible, and it’s exciting to see others drive innovation and pursue opportunities in this important new market.
The Discrete Fourier Transform (DFT)
DFT of four period sin(x) The magnitude graph of sin(x), above, exhibits the embarrassment of DFT leakage. Instead of having a signal magnitude 1.0 value at an x-axis location this case corresponds to the number of sin(x) periods, there is a magnitude that is slightly less than 1.0 and several sub-magnitudes. One solution to the humiliating problem of DFT leakage is windowing. Triangular window Hanning window Hamming window These functions smoothly "tail off" the signal at both ends, reducing DFT leakage. 8-period sin(x) signal, scaled with a triangle window 8-period sin(x) signal, scaled with a hanning window 8-period sin(x) signal, scaled with a hamming window The Java window class (which is part of the fourier package) contains three methods which implement these window functions. The graphs below show the DFT of a sample containing four periods of sin(x), where the three window functions have been applied to the sample before calculating the DFT. signal(x) = sin(x) + 0.5sin(1.2x)
The Large Hadron Collider
The Large Hadron Collider (LHC) is the world’s largest and most powerful particle accelerator. It first started up on 10 September 2008, and remains the latest addition to CERN’s accelerator complex. The LHC consists of a 27-kilometre ring of superconducting magnets with a number of accelerating structures to boost the energy of the particles along the way. Inside the accelerator, two high-energy particle beams travel at close to the speed of light before they are made to collide. Thousands of magnets of different varieties and sizes are used to direct the beams around the accelerator. All the controls for the accelerator, its services and technical infrastructure are housed under one roof at the CERN Control Centre. How many kilometres of cables are there on the LHC? Download the LHC guide [PDF] CERN takes safety very seriously. Read about the safety of the LHC
Texas Electricity Ratings: The Blog
Best astronomy images 2012: See the most beautiful images of the universe
The Universe is beautiful. Which is interesting. It doesn’t have to be; it could be all colorless and weird and lumpy. Instead, it’s bursting with color, sculpted by vast forces, molded into fantastic shapes that please our eyes and delight our brains—especially once we understand what we’re seeing. Every December I pick my favorite images from the previous year to display, a task that is extraordinarily difficult. Many of these, you might expect, are from Hubble, but other telescopes get their share, as well as some that were taken by amateur astronomers with not much more than good cameras and a desire to see and capture the Universe. I can’t argue with that sentiment. On Aug. 31, 2012, the Sun had a major hissy fit: A vast arch of material was lifted up off the surface by the Sun’s powerful magnetic field. Venus orbits closer to the Sun than the Earth does, and on rare occasions our orbits align such that Venus passes directly in front of the Sun. JAXA/NASA/Lockheed Martin. Going Deep.
