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Prometheus

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Prometheus last won the day on January 22 2020

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About Prometheus

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    Building statistical models for Raman spectroscopy.

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  1. I got the same numbers. This discovery was considered noteworthy because they were looking at equatorial regions were it was expected no water would be present. Presumably there is a greater abundance at the poles? Couldn't find reliable figures on a quick search. Interesting question about how much is needed to enable colonisation. The proximity of the moon (relative to other celestial bodies) means any colony need not be fully self-sufficient. Speculating, if He3 became a sufficiently valuable commodity then companies would be willing to ship all the water they needed up from Earth - the tricky word being sufficiently. In short the viability of a lunar colony would be dependant upon economic factors in addition to the engineering ones.
  2. That's a problem but is this legislation going to change that - from what i understand the Aussies are talking about diverting ad revenues to mainstream media? I think the fundamental problem with online echo-chambers is that we have algorithms optimise only for traffic interacting with the reptilian parts of our brains which are the part of us most easily triggered to smash that like button, as the kids say.
  3. But are they complicit or is it just changing the ways people interact with media, thus making traditional routes less viable? It reminds me of high street chains complaining about internet retailers: the former have to pay taxes on property, the latter not so much, giving internet based operations a competitive edge. But, in this example, nothing nefarious is being done by the internet based retailers. Maybe the solution is to innovate rather than legislate?
  4. Banning any websites will encourage more people to use VPNs. If a sizeable proportion of a population are using these then any government loses any ability to control their internet.
  5. If you're thinking beyond low-Earth orbit there's also the interaction of solar activity and the Van Allen belts, which can be influenced by more subtle solar activity than CMEs, as well as various other factors. I believe Apollo just burned through it as quick as possible to minimise exposure, but if we ever get to a point where humans frequently traverse this zone it might be taken into account. But that's not a dramatic effect like you're envisioning, just an increased lifetime risk of some diseases.
  6. Ah, you want to statistically compare time series. That sounds tricky, though a quick google shows it might be possible, but i can't help you there. I would ask whether you really want to compare trends over time though, which is what you're doing with time series, or are you only care about comparing the means of the pre and post groups then more standard stats test will suffice.
  7. Some quick thoughts. Paired? That implies you are able to match individual criminal's pre and post scores. If so, great. You need to start looking at the distribution of your data. It's count data that has been normalised - i'll bet you it's not normally (or Student T) distributed. You may also suffer from an inflated number of zero counts (i.e. some individuals just don't use some words that others do). What are the actual outcomes here? Presumably you have many keywords, therefore its not a single outcome but a collection. Or do you pool all these results into a single outcome somehow? Best bet is to consult a statistician who will tsk at you for talking to them after you collected the data. Next best is to delve into the literature and see what other researchers have done - particularly if there's a statistician on the paper, they will likely have encountered many of the problems you will.
  8. I've not heard that saying before, but i hear about unsafe roads all the time. Everyone seems to know a dangerous stretch of road, a death trap - such roads are often modified to make it safer, if even that's just speed cameras. I don't think it unreasonable to modify roads slightly if it helps automated vehicles out, though constrained by financial realities. If, for instance, the particulars of the cattle grid and the hill that combined to cause issues in the BBC article occurs just a few times in the world, then changing the infrastructure seems reasonable. If, however, it's every other cattle grid then changing the vehicle seems more reasonable.
  9. It is irrelevant whether Sharia law is 'compatible' with Western law or not: you cannot have a single country that runs one system of laws for some of its citizens and another system of law for others. That way lies anarchy. This is known as the no true scotsman fallacy - rather than actually confront why Islam can be interpreted in nefarious ways, the problems are just waved away as not being 'true' Islam. Of course, they will say the same thing about your interpretation of Islam.
  10. Don't know. You've read through their accompanying paper? Under their FAQs is a contact form - i'd ask them directly.
  11. From their website: CDR and dementia diagnosis can be found with other demographic data in “ADRC Clinical Data”. Or you take the opportunity to try some unsupervised learning.
  12. Isn't that more a definition of machine learning, which is itself a subset of AI?
  13. Even if they prove correlated, with millions (billions?) of astronomical bodies now being tracked our sun is bound to be in sync with some of them for some of the time by some metric.
  14. Does spatially-resolved have a specific technical meaning in this context? Spatial information is acquired by taking a spectrum from a defined location then shifting the stage slightly and taking a spectrum from an adjacent location and so on, then computationally stitching them all together.
  15. Hyperspectral imaging using Raman microspectroscopy is a thing, the putative benefit being that images of various biochemicals can be acquired without the need for individual staining, as is currently done via immunohistochemistry. It's quite a specialised setup though. I gather the OP speculates such techniques can be modified to allow brain imaging? If only. I've seen some transcutaneous experiments, mostly for blood glucose monitoring which isn't concerned with spatial information. Going through skin is one thing, i've never come across any set-ups even trying to penetrate bone. I don't know physics, but one problem that straight away suggests itself is that if you are using longer wavelengths to achieve penetrance, then you are limiting the usefulness of any spatial information (as there is a dependence on wavelength and spatial resolution).
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