Can you cross the beams of a uv laser and an infrared laser to make visible light? |
- Can you cross the beams of a uv laser and an infrared laser to make visible light?
- Is there any molecules is space? I mean in the vacuum part of the space?
- Can a sha512/md5 hash be reverse engineered that it can produce the original file?
- Sand that’s beneath the sand at the deepest part of the ocean - is it wet too or is it dry due to some kind of intense pressure barrier?
- Is 'dopamine fasting' legit? What's the science behind it?
- With the power of interferometry and the like, is there still any advantage to constructing extremely large single-dish radio telescopes?
- Science Discussion Series: We are a panel of scientists working on the biology of music and language, here to chat with you about how our brains accomplish the amazing feat of communicating through speech and music! Let’s discuss.
- Can anyone explain nuclear reactor breeding ratios? And a few other questions.
- In strong nuclear force interactions, is there attraction or repulsion between a color and the anti-particle of another color?
- How can you tell composition of minerals?
- If we found an organism claimed to be an alien, what would be the biological markers we could check to verify it is extraterrestrial, as opposed to a hitherto unknown terrestrial species?
- Why does Neurofibromatosis type 1 (NF1) only affect the nervous system and the skin (both deriving from the ectoderm)?
- Since the Earths orbit is elliptical shouldnt the seasons be slightly shorter or longer?
- Why doesn't the proton in a hydrogen atom have energy levels like the electron does, or does it?
- Why do Mercury and Venus spin slowly, but not the Earth?
- I have a cube of copper with a wire coming out of both sides. If I connect the cube to a source of power, what pattern would the electrons make in the cube as it flowed across?
- Is the y male chromosome dominant over x or are they codominant?
- Does Inverse Compton-Scattering result in reflection and refraction?
- What causes the delay in between contamination by ionizing radiation and the severe symptoms?
- Why do stars expand?
| Can you cross the beams of a uv laser and an infrared laser to make visible light? Posted: 02 Dec 2019 09:09 PM PST The underlying reason I was thinking about this is that I vaguely recall when I was taking an acoustics class in college that there was a concept of two soundwaves of different frequencies overlapping and creating another frequency. I am likely getting that part wrong, but whatever the concept was it made me wonder if the same could be true for light. [link] [comments]  |
| Is there any molecules is space? I mean in the vacuum part of the space? Posted: 03 Dec 2019 03:52 AM PST I've learnt that there's absolutely nothing between us and the moon or basically anything till we reach their atmosphere and I'll be honest I just came up with this question out of the blue right now but I am curious, is there really nothing in space? [link] [comments]  |
| Can a sha512/md5 hash be reverse engineered that it can produce the original file? Posted: 03 Dec 2019 05:44 AM PST |
| Posted: 02 Dec 2019 10:33 PM PST |
| Is 'dopamine fasting' legit? What's the science behind it? Posted: 03 Dec 2019 04:26 AM PST "Proponents of dopamine fasting believe that we have become overstimulated by quick 'hits' of dopamine from things like social media, technology and food. They say that by deliberately avoiding these common stimulants – which we see as pleasurable activities – we can decrease the amount of dopamine in our brain. Then, after the fast, when we re-engage with these stimulants, we enjoy them more and our lives feel better." [link] [comments]  |
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| Posted: 03 Dec 2019 08:03 AM PST |
| Can anyone explain nuclear reactor breeding ratios? And a few other questions. Posted: 03 Dec 2019 03:05 AM PST I'm currently working on a mod for a video game (Factorio) which overhauls how nuclear energy in the game works. Partly I'm doing this because the game makers saw fit to make solar power seem like a better option for power at scale, and partly because if I end up being able to get people interested in nuclear energy, then all the better. I want to teach with my mod, but teach to a crowd that is mildly curious and utterly ignorant, so I am starting them off with crayons instead of 3d modeling software. I've hit something of an understanding wall, where my google-fu and existing knowledge are insufficient to get me over the next hurdle of understanding. My mod is designed to have 3 reactors available for use by the player: Tier 1: 500MWe (2GWth) LWR. Assume this is one of the very first gen I light water reactors. Inefficient, not many best practices or improvements. Only 25% efficient overall. Huge material cost due to vast amounts of concrete and steel needed to construct the pressure/biological safeties. Tier 2: 1GWe, 33% overall plant efficiency. This is to be either a Gen III+ or IV sodium fast reactor design. Because of how the game works, much of the beauty of it being a breeder reactor design will have to be moved from the reactor core itself to the fuel reprocessing cycle. I assume oxide or metal fuel. Fundamentally, it doesn't seem like sodium fuel rods are that different from LWR rods, apart from the specifics of engineering them (material choices, shape, pins instead of pellets, separating u235/pu239 from u238 so that you get better breeding, etc). Tier 3: 1.5GWe, 45% overall efficiency. This is meant to be a thorium fueled molten salt reactor (no I don't think it's the godsend some people think, but I do think it's a decent idea worth exploring, I eagerly await results from China and India). Two-fluid design such that it gets a breeding ratio > 1. This reactor will be the first (in the game) to use a high-temp gas for the turbine loop instead of steam. It will also feature an online fuel reprocessing facility built into the reactor site itself. I have tier 1 pretty locked down. Documentation about how LWRs work is widely available, even to noobs like me. Tiers 2 and 3 are where I hit a few brick walls. With that, here is my wall of questions. You can pick and choose, answer them a few at at time, however you prefer. I just do better if I list everything I don't know because you can possibly save yourself a lot of time, or point out something I'm not considering. Note: None of these reactors are meant to generate anything but power. No weapons proliferation considerations.
Thanks for your time and consideration. [link] [comments]  |
| Posted: 02 Dec 2019 02:27 PM PST So, say a red quark and an anti-blue quark. Or a green quark and an anti-red. Would there be attraction or repulsion? Or no force at all? [link] [comments]  |
| How can you tell composition of minerals? Posted: 02 Dec 2019 10:15 PM PST How do people identify minerals just by looking at certain rocks or knowing their source? I guess that comes with experience but do we have a resource where one can reference stuff that they find in natural world to figure out their composition? [link] [comments]  |
| Posted: 02 Dec 2019 06:13 AM PST |
| Posted: 03 Dec 2019 01:20 AM PST Neurofibromin 1 is a protein encoded by the the tumor suppressor gene NF1 which negatively regulates the activity of Ras. Mutation of this gene are associated with type 1 Neurofibromatosis, an autosomal dominant disease. By controlling the expression of neurofibromin 1 protein in the various tissues no particular discrepancies are observed: the neurofibromin 1 protein is expressed approximately on the same quantity in all tissues. Whereas Neurofibromatosis type 1 causes problems such as coffee-milk spots, Lisch's iris nodules, freckles and multiple neurofibromas, how is it possible that only nervous system and the skin are affected? I tried to consult the scientific literature about it not finding the answer to this question. If someone had the answer could you please also send me the link where it is explained? [link] [comments]  |
| Since the Earths orbit is elliptical shouldnt the seasons be slightly shorter or longer? Posted: 02 Dec 2019 11:25 PM PST Does the elliptical orbit cause a sort of "slingshot" effect that increases acceleration? I've noticed that spring and fall seem to last a bit longer but that could be due to geographical location (Massachusetts) [link] [comments]  |
| Why doesn't the proton in a hydrogen atom have energy levels like the electron does, or does it? Posted: 02 Dec 2019 07:39 PM PST I recently learned about the 3D solution to the Schrodinger equation for hydrogen and it was all focused on the electron. The proton experiences the same potential so it seems like it would have the same solution but with a different mass and radii (distance to the barycenter of the atom?). [link] [comments]  |
| Why do Mercury and Venus spin slowly, but not the Earth? Posted: 02 Dec 2019 09:38 PM PST So, Mercury and Venus have long days and short years because they're close to the sun. Why don't we have a similarly long day? Or even, why did the ratio of day to year jump to drastically? [link] [comments]  |
| Posted: 02 Dec 2019 05:17 PM PST |
| Is the y male chromosome dominant over x or are they codominant? Posted: 02 Dec 2019 09:54 AM PST |
| Does Inverse Compton-Scattering result in reflection and refraction? Posted: 02 Dec 2019 08:05 PM PST While thinking about what happens during reflection/refraction I've come across Fermat's principle then Hugyen's principle and some papers. It appears to me that reflection and inverse compton scattering are the same thing. Is this true? [link] [comments]  |
| What causes the delay in between contamination by ionizing radiation and the severe symptoms? Posted: 02 Dec 2019 07:13 PM PST I was reading about the effects of radiation after rewatching the Chernobyl HBO series was wondering why is there a latency period where you seem fine before the harsher symptoms settle. Couldn't find any satisfactory explanation while searching. Was hoping you could help. Sorry if this is the wrong flair, wasn't sure which to use... [link] [comments]  |
| Posted: 02 Dec 2019 08:11 AM PST So the way I understand it, the size of a star is stable due to an equilibrium between gravity pulling matter in, and nuclear fusion pushing matter out. I'd like to know: 1) How/why does the star switch fuel source to Helium (when it wasn't being fused before)? 2) Why does this transition result in the star expanding? 3) How is this new process maintained after the expansion, stabilizing into a new steady state of Helium consumption (specifically, how is it stable at a larger radius)? Also, i feel if i could see a free energy diagram for Hydrogen/ Helium fusions, that'd go a long way to help the explanation. So bonus פpoints if you can link em! [link] [comments]  |
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