Paranapanema, SP - Brasil - / Being useful and productive is the aim of every knowledge acquired / - Quod scripsi, scripsi. - Welcome !
domingo, 14 de dezembro de 2014
Inside a Jet Engine
At takeoff, a jetliner engine can move 1.25 tons of air per second. That’s enough power to suck all the air out of the largest football stadium in less than a minute! Here’s a basic look at incredible jet engine technology with the turbofan engine.
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9 things I wish people understood about anxiety
What's the point of a curved TV?
The world's first 110-inch curved UHD TV unveiled by TCL in September – but is curved better than straight? Over the last year or so, we've seen a number of curved TVs hitting the market. Sure, they look slick and stand out from the crowd, but what, if anything makes a curved TV better than a flat one when it comes to your viewing pleasure? One of the biggest marketing hooks upon which curved TV manufacturers like LG and Samsung are hanging their hats is the idea that curved TVs provide better a better viewing experience, and there is some scientific evidence to back up the claim. Oshin Vartanian and colleagues at the University of Toronto's Department of Psychology have been working in the the field of neuroaesthetics. This is the study of what neurological factors play a role in the things we find pleasing to the eye, or not. Research by Vartanian and his team suggests that we naturally find curved objects more pleasing than those with straight edges. Whilst he acknowledges that curved TVs "provide some flair," Dr. Raymond M. Soneira of display diagnostics and calibration company DisplayMate argues that whether or not we like a curved TV more or less than a flat one is still primarily a subjective matter. Soneira, who earned a Ph.D. in Theoretical Physics at Princeton, says there are other, more tangible benefits to a curved screen. Soneira explains that the concave shape reduces the number of reflections on a screen by eliminating certain angles from which they can be created. "This is very important for a display technology that produces excellent dark image content and perfect blacks, because you don’t want that spoiled by ambient light reflected off the screen," says Soneira. He also says that curved TVs improve the viewing experience for individuals sitting off-center. Soneira explains that the curve of the screen works to eliminate some of the unintended "foreshorteneing" caused by sitting to one side. That is to say, images displayed on the far side of the screen that would otherwise look unnaturally small compared to images on the near side of the screen due to the larger viewing distance are, in fact, equalized to some extent by the curve. Soneira also points out that the curved shape keeps the screen at a more uniform distance from the viewer's eyes when they are sitting centrally. This reduces the slight visual geometric distortion caused by the fact that the sides of the TV are further away from the viewer than the center when looking at a flat screen. This more uniform distance from the edges and the center of the screen to the viewer's eyes is something to which Samsung, amongst others, has argued there are other benefits. By bringing forward the sides of the screen, a curve effectively increases size of a TV as perceived by the viewer. This is because it subsequently fills more of the individual's field of view. Samsung also argues that curved screens deliver a greater sense of immersiveness and that the more uniform focal distance minimizes viewing distortion at the sides of the screen. Based on an average living room viewing distance of around 3-4 m (10-13 ft), the firm says that 4200 mm (13.8 ft) is the optimal curve radius to ensure a uniform viewing distance across the screen. So it would seem that along with their futuristic looks (which let's face it, is a perfectly valid reason to buy one for many consumers), there are some tangible benefits to curved TVs. Whether or not these justify the significant price hike over their flat counterparts is another matter entirely. What's your take on curved TVs? We'd love to hear from readers who have taken the plunge.
About the Author Stu is a tech writer based in Liverpool, UK. He has previously worked on global digital estate management at Amaze and headed up digital strategy for FACT (Foundation for Art and Creative Technology). He likes cups of tea, bacon sandwiches and RSS feeds. All articles by Stu Robarts
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Review: aerelight OLED lamp
Gizmag tries out the aerelight OLED lamp (Photo: Ben Coxworth/Gizmag) Image Gallery (5 images) While OLED technology is increasingly being applied to things like electronic gadget displays and TVs, it can also serve as an efficient and aesthetically-pleasing form of lighting. A number of companies have capitalized on this fact by marketing OLED lamps, although most of them are quite expensive – prices can range from around US$500 up into the thousands. Canada's OTI Lumionics, however, has developed its own cost-effective OLED lighting system, and incorporated it into the $239 aerelight. I recently got to try one out for myself. First of all, just what is an OLED, or Organic Light Emitting Diode? Well, essentially it's a thin electroluminescent panel containing carbon-based organic dyes, that emits light when an electrical current is passed through it. As a light source, OLEDs have an electrical efficiency similar to that of LEDs, although they produce a softer, more even light – this is because the light is being emitted from a broad sheet of material, instead of from individual bulbs. Additionally, they're said to produce a nicer color temperature of "white" light, plus their thin, flexible form allows for some interesting design possibilities. ... which brings us to the aerelight. As can be seen in the photos, it has a very modern, minimalist form – its light-emitting panel is less than 2 mm thick. There are no controls on the anodized aluminum-bodied lamp whatsoever, with users turning it on and then cycling through three brightness settings simply by touching it anywhere. At its maximum setting, it puts out 1,000 lux at a warm, incandescent-like temperature of 2,900 K (using just 7 watts of energy as it does so). This certainly proved sufficient to light up my desk area. It would be nice if the angle of the panel could be adjusted, although this is by no means a deal-breaker – because there's no one bright spot of light, glare isn't really an issue. It's also worth noting that unlike the halogen desk lamp which I currently use, it produces no noise whatsoever. According to OTI, the lighting panel should last for 20 years with a typical usage of three hours per day at maximum brightness. As an added feature, the designers have built a Qi wireless charging pad into the wood-accented base of the lamp. To charge a Qi-ready smartphone (which I had some difficulty tracking down for testing), you just place it on the pad and the charging begins. It's a handy feature I suppose, although given that most phones still don't incorporate the Qi system, perhaps buyers should have the option of going with a less expensive lamp that doesn't have a charging pad. All in all, I definitely liked the aerelight – particularly its simplicity, quality of light, and solid feel. OTI is taking preorders now, with shipping planned to start early next year. Buyers can choose between frame colors of black, red and silver. Product page: aerelight
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Suplemento: Os benefícios do Picolinato de Cromo na prática de exercícios
(O texto a seguir é de natureza meramente informativa a respeito dessa substância. Todo e qualquer suplemento deve ser tomado depois de obter instruções e direcionamento de profissionais na área de Saúde)Os sais minerais são de grande importância para a manutenção da saúde e para a melhora do desempenho atlético. Ao todo, cerca de 20 minerais são necessários - em doses adequadas - para manter o bom funcionamento de tecidos e células. Alguns desses elementos são absorvidos em doses Um mal a ser evitado Podemos citar três “tragédias” para que você leitor possa tomar conhecimento de alguns males que a Resistência à Insulina pode causar-lhe: Que tragédia! Seu crescimento muscular é limitado e você ainda corre o risco de sofrer um evento catabólico após o treinamento, ao invés de anabolizar por completo! Mas o pior é que a produção excessiva de insulina pode levar você a um ganho excessivo de gordura e como tudo o que está ruim pode piorar, você ainda pode desenvolver Diabetes tipo II e para isto basta que você consuma excesso de carboidratos de má qualidade combinados com muita gordura (fisiculturistas em épocas fora de competição devem ter cuidado nesta fase).Isso acarretará fatidicamente na redução da afinidade dos receptores de insulina nas membranas celulares, porém, nos adipócitos, suas células de gordura, a “amizade” continua e seu pâncreas, numa tentativa heróica de tentar compensar a queda na eficiência desse hormônio e sua atuação nos tecidos alvo (exceto o adiposo!) passa a secretar maiores quantidades de insulina e este aumento favorece unilateralmente uma melhor assimilação da glicose sangüínea pelos adipócitos em detrimento dos demais tecidos. A glicemia eleva-se — uma conseqüência direta da deficiência de assimilação desse açúcar pelas células — e isso acaba resultando num aumento de oferta de glicose para as... Como amenizar esse quadro? Dosagens Recomendadas Sugestão de Uso: ALEXANDRE ROBERTO DE MELO |