Force fields are very possible. The military are trying to make a Star Trek-like force field that will end up acting like armor for either soldiers or machinery. If force fields were to work and come into being then they would take up a small amount of power to run them. Also starting off small with this idea would be a timed force field for armor. It would help keep our soldiers safe from rockets or bullets if they had small force fields protecting them. Although Force Fields would be very useful for this day in age, especially when under attack overseas, they would also have some defects that would need to be tested. For example, humans have a slight negatively charged outer shell; therefore the force field (proton based) would in fact repel but only a short distance. There are force fields being made in the UK, but can only be active for less than a second. A control system would need be made to the exact point when the blow needs to be made. These force fields can be very practical when under attack.
Upon further research into the prospects of creating a safe nuclear generator the size of a walnut, it becomes increasingly clear that it is much less feasible than previously thought. One nuclear engineer explained that the smallest critical masses necessary in an average nuclear generator, using Plutonium-239 or Uranium-235, would still have a core the ranging in size from a softball to a large basketball. It would also weigh a few kilograms at the very least. The core sizes do not even take into account the mass of the necessary shield and of the equipment needed to harness the radioactive energy. The smallest complete nuclear reactor was used to power the small military submarine NR-1. That generator was the size of a trash can. An aqueous reactor, one whose core material is dissolved in a substance that retards neuron movement, could have a mass smaller than a kilogram, but it would have no great power applications, since it is highly self-limiting. Depending on how much energy the force field would need, though, it could be a potential solution.
How the information that we have now obtained changes our perspective is that, we previously thought that this kind of technology was not possible with the kind of technology that we have today. After having done some research we have discovered that creating a nuclear generator that is miniaturized to the size of a walnut is even less possible than previously thought, because all the precautions that would have to go into it. An example of this being is how the power is limited only by how quickly you can remove the heat before the core components are damaged. The only way that it would be able to be in the compact size is if it were to have no real power to it, and have no real applications. On the other hand we have the concept of force fields and how they would be useful in this society. As stated previously it would be extremely useful for situations overseas and so forth. It is also capable of creating invisible barriers around a vehicle or a building, thing that have been inspired by outside sources such as fictional movies and so on. But the military are taking it seriously and seems to think that this idea is very plausible. So in contrary to our previously belief the force field is in available in our technology today. It was stated that there has been loads of researching done finding ways to develop working shields for quite some time.
http://www.reddit.com/r/askscience/comments/1e8hs3/whats_the_smallest_nuclear_reactor_we_can_build/
http://www.reddit.com/r/askscience/comments/1e8hs3/whats_the_smallest_nuclear_reactor_we_can_build/
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