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SciTechPress

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Everything posted by SciTechPress

  1. SciTechPress

    This Bike Was Built Like A Car To Handle Different Terrains

    Imagine how much gas we would all save.... accidents wouldn't kill people... we would all live much closer to work.... AND we all might get skinny in the process 😉
  2. What a concept! 1507940147251-drlcss.mp4
  3. , em vez de gastar milhões em marketing com jogadores de futebol, artistas, políticos, sem falar gastos com arte de gosto duvidável, o banco fez algo que jamais será esquecido pelos seus clientes. É Natal!Incrível !!! 1507940147251-drlcss.mp4
  4. SciTechPress

    Plastic Containers

  5. SciTechPress

    Aduction Humor

  6. SciTechPress

    Space is the future!

  7. My heart would be pounding scared.... hard to believe anyone would take a group in such a vehicle???
  8. SciTechPress

    What is the price of gas where you are?

    @devarajjh how much is that in USD? Just curious.
  9. SciTechPress

    What is the price of gas where you are?

    Since then it climbed to the high $3 range.... and now it is going lower again.... I saw this more recent post: The rumor is that the price will go even lower and then skyrocket. I love that answer.... Prices will go up and down. (so insightful! 😉
  10. SciTechPress

    TItanic

  11. SciTechPress

    This ball will stop seasickness.

    1507940147251-drlcss.mp4
  12. I just read the following on another forum talking about the long term prospects for Earth: "...And we’re cooling off down below at a far faster rate (about 5x) than the sun is warming up. The point is… in about a billion years… maybe 1.5 (we’re still measuring and guessing to be honest)… the Earth will be very cold, with most of our remaining water trapped permanently below the surface as part of the lithosphere. We won’t be much better off than mars is now. And as the dynamo at the center of the earth wanes (and it is), the magnetic field that keeps the sun from punishing our atmosphere worse than it already does will no longer be up to the job… so not only will the crust beneath our feet by cold, but the air will be a looooot thinner (and thus also cold.) Radiation will get through much more easily and you’ll be lucky to see an equatorial summer’s afternoon reach 10C. Of course, dry as as a bone as it would be, you probably wouldn’t see any liquid water anyways… not even at high noon." ---------------------------------------------------- So ... Could Global Warming end up being a good thing for planet Earth long term?
  13. SciTechPress

    The Sex Lives of Christmas Trees

    The humble pine cone is more than a holiday decoration. It's an ancient form of tree sex. Flowers may be faster and showier, but the largest living things in the world? The oldest? They all reproduce with cones.
  14. How to make hobby rocket “sugar motors” using sugar and kitty litter, that shoot up over 2,300 feet high, and cost less than $0.50 to make.
  15. SciTechPress

    The Future Is Bleaker Than You Think

    Our star will expand into a red giant in about 4.5billion years. At this point will extend to 0.8AU or more. 500,000 years later it will shed the outer layers of gas(think of it like an onion) and the end result will be two things. 1: a planetary nebula 2: a White Dwarf A white dwarf is the core of the star and since it was the core, it is still very very very hot. It can easily be about 40,000K which is about 4000 x the boiling point of water. Since these objects are no longer generating heat they’re cooling down. But since space has no air they only way they cool down is via radiating the heat out. The time it will take for a white dwarf to cool to 2K is over 10,000,000,000,000 years, yup. They will take longer to cool than the universe has been around for. In the future when their is not enough Hydrogen to form any new stars the only thing that will be left is these white dwarfs. Once these reach 0K the universe will be dead, black.
  16. Imagine an aircraft engine that has no moving parts, produces no harmful exhaust and makes no noise. That's what researchers at the Massachusetts Institute of Technology (MIT) in the US have created by adapting a technology previously only used in spacecraft so it can power flight over the Earth. Ion drives have been used on spacecraft since the 1960s and work by firing out a stream of charged particles that propel the vessel forward. As well as being carbon neutral, they are less likely to go wrong and cheaper to maintain than conventional engines because they have no propellers, turbines or fuel pumps to break down. The only problem was that, in Earth's gravity, the thrust produced by the drive wasn't enough to overcome the weight of the batteries needed to power them. Until now. The timely new research, published in Nature, paves the way for the possibility of silent drones in the very near future. With further advances in materials and power conversion, silent crewed aircraft and eventually commercial flights could also be on the horizon. In fact, this breakthrough could be the first step in changing how we all fly around the world in the future. All aircraft engines work by pushing something backwards so that the craft moves forward. Usually this is air, whether cold air driven by electric propellers or hot air fired out by jet engines. Ion propulsion instead sends out charged particles or ions generated in the gap between two electrodes with a high voltage inbetween. The ions interact with the air, creating an ionic wind that is sent backwards, propelling the aircraft forward. As with propeller-driven solar powered aircraft, ion drive craft are powered by electricity and so don't need to carry fuel, other than batteries filled with charged particles. The new research shows that, with some clever modifications to the battery setup and the way the electrical power is converted, it's possible to reduce the battery weight enough to make this technology fly. Compromise design A craft with an ion drive also needs a large front area to generate the ionic wind in the right way. But this would usually make the aircraft heavier, so the researchers had to balance these conflicting limitations. They designed a wingspan that was small enough to reduce risks and make the testing cheaper and easier, while being large enough to use standard remote control components. The researchers flew ten flights using an aircraft with a 5-metre wingspan, weighing less than 2.5 kilograms. They were able to fly it for up to 9 seconds over a distance of 45 metres at a speed of 5 metres a second. The craft needed around 20 seconds to build up its power and was then launched using a mechanical bungee system. While this flight time and distance might not seem like much, the researchers point out that they're actually similar to the those of the first flight of aeroplane inventors the Wright Brothers in 1903. Making further advances in materials and power electronics, and optimising the airframe, could enable the craft to fly faster and for longer. It may also be possible to use solar panels to generate the electricity needed to power the ion drive. One of the big advantages of an ion-powered craft is its near-zero levels of noise. So it's likely the technology will find its first application in silent drones. Its lack of moving parts should make it relatively easy to scale the system down for smaller craft and make it easier to scale up. But bigger craft will also need a bigger increase in power. To build an ion-powered airliner you would need to increased the amount of power relative to the craft's size 300 fold. But look how far we have come since the Wright Brothers' first flight. The sky may be the limit with this new technology. Journal reference: Nature Provided by: The Conversation
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