Is there a limit to expansion of the International Space Station? |
- Is there a limit to expansion of the International Space Station?
- How did we know the gravity on the moon's surface before we landed on it? What if it was much denser than anticipated and the lander didn't have enough fuel to reach exit velocity?
- Can we induce visual experiences in someone who has been blind from birth by stimulating their brain?
- How does fiber grating achieve mode coupling in optical fibers?
- What, if any, are the differences between boric acid, orthoboric acid, and borax?
- Why does ammonia not turn into ammonium in high pH water?
- Does placing a non-conducting ferromagnetic material between two conductors carrying AC reduce or eliminate proximity effect?
- ABO blood groups: do heterozygotes (ex Ao) have the same number of antibodies as homozygotes (ex AA)?
- How does RF pulse affect precession of the net magnetization vector in NMR?
- Is energy something physical? Where (if anywhere) is energy stored in atoms / molecyles? For ex. If I raise an object from the ground (thus storing potential energy into it) where does it go?
- What is the smallest planet/moon that still has a detectable magnetic field?
- Can TIR only occur if the second medium has a lower reflective index?
- Can anyone give me a layman's description of what a divertor and separatrix do in tokamak?
- Do people in comas snore?
- How do those built in strips that allowed you to check the useful life of batteries work?
- How does Quantum Uncertainty interact with Electrical Current, if at all?
- What makes a grippy texture grippy?
- Is Elestic hysteresis possible in friction-less system?
| Is there a limit to expansion of the International Space Station? Posted: 23 Oct 2016 05:14 AM PDT There were of course cancelled modules, and I've seen some discussion of attaching private, non-state, modules to the rest of the station. If there was the funding and desire to continue using the ISS, would there be hard engineering limitations on the maximum size of habitable space that could be attached to it, or could the existing ISS be used (in theory) as a "backbone" to grow and expand on? [link] [comments]  |
| Posted: 22 Oct 2016 08:40 PM PDT I'm guessing it's from observing its orbit and knowing its volume, but it seems really hard to get more than just a ballpark number from that. Was having a near exact figure not critically important for planning? [link] [comments]  |
| Posted: 22 Oct 2016 05:59 AM PDT I know we can induce visual experiences in people who already have a functional visual system, for example, in this subject, or those who had a functional visual system but lost some functionality due to disease or injury. However what I am unaware of, is if it's possible to induce visual experiences in individuals who have been blind from birth, e.g. those that have no eyes, via stimulating or inducing the relevant activity in their brain. Edit: The majority of responses seem to be missing the point of my question. Perhaps I was not specific enough. The question I was getting at is, what is necessary for the having of a visual experience? It is often said that we don't "see" with the eyes because for example one can have visual experiences by stimulating the visual cortex. So from that type of finding it would seem the necessary components, e.g. the neural circuitry, for inducing visual experiences are in the cortex. If that were the case, then in theory it should be possible to create the relevant activity, either by continued stimulation directly to the cortex to create the right circuitry which would then allow for the right kind of activity, or by stimulating the circuitry that is already there, to mimic the activation pattern that is taken to be the necessary component in the generation of a particular visual experience. That is why I asked if we can induce visual experiences in someone who has been blind from birth by stimulating their brain (should have specified cortex). Because if we can, then we really can discount pre-cortical processing in being necessary for the generation of visual experiences. This might prove to be more of a technical issue, especially as we don't yet have a detailed account of the activity that is at least sufficient to generate a visual experience. However, if it isn't possible to induce visual experiences directly in the cortex, in the absence of external input through the pathway of the retina -> LGN etc., then pre-cortical processing might play a bigger role than is currently thought. [link] [comments]  |
| How does fiber grating achieve mode coupling in optical fibers? Posted: 23 Oct 2016 04:23 AM PDT I've read some papers about using fiber gratings to cause mode conversion from the fundamental mode to the higher modes. I am trying to understand the physics behind the gratings. From what I gathered, it is the periodic changes in the refractive index that cause the coupling between the modes but I don't understand how it is caused. [link] [comments]  |
| What, if any, are the differences between boric acid, orthoboric acid, and borax? Posted: 22 Oct 2016 06:40 AM PDT Pretty basic question but this sub seemed the most fitting! I routinely use all 3 types, I use borax with my laundry and boric&orthoboric for ant&bug baits and dusting, but am wondering what differences, if any, there are amongst these 3 forms (if they are in fact different forms!) My curiosity was piqued when reading a product label, an ant bait product, and it said "sodium tetraborate decahydrate (Borax)", when other products on the shelf next to it were saying 'orthoboric acid' - is this stuff the same or are these different? It's disconcerting to think an insecticide is a laundry additive as well! Any help in understanding/differentiating these is appreciated, thanks guys!! [link] [comments]  |
| Why does ammonia not turn into ammonium in high pH water? Posted: 23 Oct 2016 04:36 AM PDT In highly basic water why does ammonia not change into ammonium? [link] [comments]  |
| Posted: 23 Oct 2016 02:18 AM PDT Two conductors carrying AC, that are close to each other, produce a magnetic field that influences their current distribution inside each other. Will placing ferromagnetic material between them confine the magnetic field inside the material, thus reducing or eliminating proximity effect? The ferromagnetic material should be laminated or non-conductive to reduce eddy-currents. Also how will the ferromagnetic material influence the total magnetic field produced by the conductors? [link] [comments]  |
| Posted: 22 Oct 2016 05:18 PM PDT Basically, does having matching alleles give a bigger dose of surface antigens? Will someone with AA have more A surface antigens than someone with Ao? [link] [comments]  |
| How does RF pulse affect precession of the net magnetization vector in NMR? Posted: 22 Oct 2016 11:51 AM PDT 1st question: This website and this video show that the angle of precession increases when you apply the RF pulse. However, Section 5.00 of this website shows that the cone of precession flips but the angle doesn't change. Could someone please explain what exactly is happening to the net magnetization vector? 2nd question: This website says that if the frequency of the RF pulse =/= Larmor frequency then it would precess around the Beff axis in the rotating frame. Does it mean that in the stationary frame it's precessing in 2 axes (the z axis and Beff axis) at the same time? Thank you very much. [link] [comments]  |
| Posted: 22 Oct 2016 12:02 PM PDT |
| What is the smallest planet/moon that still has a detectable magnetic field? Posted: 22 Oct 2016 11:40 AM PDT |
| Can TIR only occur if the second medium has a lower reflective index? Posted: 22 Oct 2016 06:47 AM PDT The formula for the critical angle is Arcsin(n2/n1), and as sin only takes values from 1 to -1, n2 always has to be smaller for it to work. Is it impossible for it to occur if n2 is greater, if so why? Or is there a different formula. [link] [comments]  |
| Can anyone give me a layman's description of what a divertor and separatrix do in tokamak? Posted: 22 Oct 2016 08:05 AM PDT |
| Posted: 21 Oct 2016 10:31 PM PDT |
| How do those built in strips that allowed you to check the useful life of batteries work? Posted: 22 Oct 2016 03:24 AM PDT These ones. Was having a nostalgic moment and remembered messing around with these as a kid. [link] [comments]  |
| How does Quantum Uncertainty interact with Electrical Current, if at all? Posted: 22 Oct 2016 09:33 AM PDT |
| What makes a grippy texture grippy? Posted: 22 Oct 2016 04:40 AM PDT |
| Is Elestic hysteresis possible in friction-less system? Posted: 22 Oct 2016 05:17 AM PDT |
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