How many people can one tree sufficiently make oxygen for? |
- How many people can one tree sufficiently make oxygen for?
- AskScience AMA Series: We're team Vectorspace AI and here to talk about datasets based on human language and how they can contribute to scientific discovery. Ask us anything!
- How do we know that quarks are fundamental particles (don’t have a substructure)?
- Why is there an EpiPen (and generic alternatives) shortage?
- Do ocean wind speeds get higher the farther from shore you get, and if so, why?
- How do longhorn beetles and other wood borers deal with sap and resin without getting stuck in conifers such as spruce, especially prior to emergence?
- In quantum leaps, do the orbital shapes "jump" from one shape to another instantaneously or does it smoothly transition to the next shape?
- What determines the shape of a galaxy?
- How was the universe a “few light years across” within a second of creation?
- How do comas affect the growth of children?
- How do we calculate the total mass of a galaxy? How does this calculation relate to dark matter? Is it possible that we are not relating these together properly?
- How long did it take for nuclear fusion to spread throughout the core of the star on "ignition"?
- What is the advantage of deuterium / tritium reactions over DT / Lithium in our attempts at fusion?
- Is there a difference between hurricanes, cyclones, typhoons, medicanes and tropical storms? If not, is there a reason other than the place where they form for the name difference?
- I'm familiar with surface plasmon resonance and can conceptualize it as applied to metal nanoparticles, but how does it apply to bulk metals?
- How does blocking for IHC not end up blocking the antigen of interest?
- What is happening chemically when a chip or bread gets stale?
- Are futuristic WMD such as antimatter bombs and relativistic kill vehicles even remotely feasible according to our understanding of physics?
| How many people can one tree sufficiently make oxygen for? Posted: 29 Sep 2018 09:35 AM PDT |
| Posted: 30 Sep 2018 04:00 AM PDT Hi, r/askscience! We're team Vectorspace AI and here to talk about datasets based on human language and how they can contribute to scientific discovery. What do we do? In general terms, we add structure to unstructured data for unsupervised Machine Learning (ML) systems. Not very glamorous or even interesting to many but you might liken it to the glue that binds data and semi-intelligent systems. More specifically, we build datasets and augment existing datasets with additional 'signal' for the purpose of minimizing a loss function. We do this by generating context-controlled correlation matrices. The correlation scores are derived from machine & human language processed in vector space via labeled embeddings (LBNL 2005, Google 2010. Why are we doing this? We can enable data, ML and Natural Language Processing/Understanding/Generation (NLP/NLU/NLI/NLG engineers and scientists to save time by testing a hypothesis or running experiments a bit faster and for additional data interpretation. From improving music and movie recommendation systems to enabling a researcher in discovering a hidden connection in nature. This can increase the speed of innovation and better yet novel scientific breakthroughs and discoveries. We are particularly interested in how we can get machines to trade information with one another or exchange and transact data in a way that minimizes a selected loss function. Today we continue to work in the area of life sciences and the financial markets with groups including Lawrence Berkeley National Laboratory and a few internal groups at Google along with a of couple hedge funds in the area of analyzing global trends in news and research similar to methods like this [minute 39:35] We're here to answer questions related to datasets and their connection to our work in the past, present and future. Please feel free to ask us anything you'd like related to our methods, approach or applications of if you want to shoot the research breeze, that's fine too. A little more on our work can be found here. We'll be on at 1pm (ET, 17 UT), ask us anything! [link] [comments]  |
| How do we know that quarks are fundamental particles (don’t have a substructure)? Posted: 29 Sep 2018 08:28 PM PDT |
| Why is there an EpiPen (and generic alternatives) shortage? Posted: 29 Sep 2018 08:29 AM PDT I have read that they are having difficulty manufacturing them, but what difficulties and why? [link] [comments]  |
| Do ocean wind speeds get higher the farther from shore you get, and if so, why? Posted: 29 Sep 2018 04:19 PM PDT |
| Posted: 29 Sep 2018 02:01 PM PDT |
| Posted: 29 Sep 2018 08:19 PM PDT Also, In the 3s diagram is it possible for the electron to fall between the orbitals in say, the black in the 3s orbital? [link] [comments]  |
| What determines the shape of a galaxy? Posted: 29 Sep 2018 11:04 AM PDT |
| How was the universe a “few light years across” within a second of creation? Posted: 29 Sep 2018 10:44 AM PDT I was reading "Astrophysics for people in a hurry", and there is a line in chapter 1 that says that when a second had passed from the Big Bang, the universe was a "few" light years across. Wouldn't it be, at most, 2 light seconds+100 or so Meters across in the first second? How could the edges move magnitudes faster than the speed of light? [link] [comments]  |
| How do comas affect the growth of children? Posted: 29 Sep 2018 11:02 AM PDT If say a baby, or a 10 year old was in a coma for several years would they still experience physical growth at a rate similar to if they were not in a coma? For example if a 10 year old went into a coma for 5 years would they wake up with the body of a 10 year old? Also how would the coma affect non physical attributes such as learning to speak, learn etc.? Many thanks [link] [comments]  |
| Posted: 29 Sep 2018 05:59 PM PDT I had the thought that when calculations are done for total mass of galaxies, do we use each and every stars mass? surely not? Then dark matter came to mind. From my understanding dark matter is this invisible web around us that holds everything together and without it our galaxies wouldn't hold together; saying the black holes in the middle of the galaxies do not have not strong enough gravity . What if you calculated the total gravitational pull of every star to every other star, planet to planet, every combination possible; would this "web" possibly be enough to be dark matter? Again, I dont know how we currently view dark matter calculations and or galaxy calculations Listen to a lot of podcasts on these subjects and took a lot of physics classes in high school so these things spark my interest . I believe physics is the correct flair.... Thanks! [link] [comments]  |
| How long did it take for nuclear fusion to spread throughout the core of the star on "ignition"? Posted: 29 Sep 2018 12:13 AM PDT Im not sure if theres a go to number in stellar evolution models for this question, but if there is: How quickly, say in our sun specifically, did the initial triggering of nuclear fusion spread throughout the stars core to it's equilibrium position? Is this a process on the order of minutes, years, centuries? And depending on what magnitude of time, can you give a rough description of what is happening physically during this initial "firing" and growing state? Additional Question (if above is short/easy): What is the boundary between the sun's core and the rest of it like? How abruptly does fusion shut off as you move out? Does the fusion rate slowly decrease radially or is there a pretty definite region (based on the scale of a star) where it cuts off? These might be stupid questions, so feel free to put that as an answer haha. Thanks [link] [comments]  |
| What is the advantage of deuterium / tritium reactions over DT / Lithium in our attempts at fusion? Posted: 29 Sep 2018 06:16 AM PDT In short, how much easier (lower temp and/or density) is required for DT T reactions rather than lithium, which doesn't have the fast neutron problem? An /r/askscience question on brown dwarfs got me stuck on it, since I remembered they can have limited deuterium and lithium fusion, and my Google-fu was weak on finding out why we breed tritium from lithium, putting most of the energy into hard-to-capture neutrons rather than just use the lithium. [link] [comments]  |
| Posted: 29 Sep 2018 12:22 AM PDT |
| Posted: 29 Sep 2018 12:15 PM PDT For a project, I'm studying SPR-imaging, a technique in which an evanescent wave is propagated through the surface of a thin piece of metal using total internal reflectance. Depending on the situation of the substrates on the other side, the refractive index is altered and the reflected wave bounces back to the detector at a different angle. I'm still working it all out, obviously, but the major problem I have is that I don't understand how the bulk metal has a surface plasmon. It definitely has a dielectric pattern, but I guess I don't see how that's analogous. Or, I'm missing the parallel between that and a nanoparticle plasmon. They just seem like entirely different things to me. [link] [comments]  |
| How does blocking for IHC not end up blocking the antigen of interest? Posted: 29 Sep 2018 10:38 AM PDT Blocking tends to be utilized in immunohistochemistry because it prevents non-specific binding. But how does it not end up blocking the antigen of interest, preventing the primary antibody from binding? [link] [comments]  |
| What is happening chemically when a chip or bread gets stale? Posted: 28 Sep 2018 11:05 PM PDT |
| Posted: 28 Sep 2018 07:30 PM PDT I found myself wondering if nuclear weapons would continue to be our most powerful weapons centures even millennia in the future, if perhaps were we to ever encounter an advanced alien civilization if it would be their strongest weaponry as well. So I thought about theortically possible things which may be more powerful, such as anti matter bombs/missiles and kinetic bombardment by accelerating an object to nearly the speed of light. But both creating significant amounts of antimatter and accelerating even a kg object to 99% of lightspeed or there about requires absolutely ridiculous amounts of power, power comparable to the energy released by the largest nuclear weapons in human history, or the amount of power the entire United States generates over days, even months. Enough energy I would imagine that we human are not even aware of a way a stereotypical starship could generate let alone contain that much power, To say nothing of the fact that were it rounded to some sort of gun or equipment it would vaporize it. So all you scientists, is it even possible as far as we know? Is there some way we think we could theoretically generate massive amounts of power? Does our understanding of physics suggest we might not need literally terawatts of power to do either? [link] [comments]  |
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