ar813

6 ms·

1.
Trump preparing large-scale cancellation of grants and funding for California(cnn.com)
18 points by ar813 1y ago|4 comments
2.
by ar813 1y ago
That's wild! Now I want to go hunting for more such examples..
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by ar813 1y ago
If I take a step back and think back to say a few (or 5) years ago, what LLMs can do is amazing. One has to acknowledge that (or at least, I do). But as a scientist it's been rather interesting to probe the jagged edge and unreliabilit
4.
by ar813 1y ago
If they can do this to Harvard, what hope do other universities have?
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by ar813 1y ago
Between NIH grant-making being slowed down and this, there is no way to interpret these moves than being an underhanded way of causing university research infrastructure to collapse. Consider also, for example, that one Friday last month th
6.
DOGE's war on "waste" looks suspiciously like a war on science(vanityfair.com)
39 points by ar813 2y ago|1 comments
7.
by ar813 4y ago
The answer to this problem lies here: “Entsminger pointed out that roughly 80% of the river’s flow is used for agriculture, and most of that for thirsty crops like alfalfa, which is mainly grown for cattle, both in the U.S. and overseas.” T
8.
by ar813 6y ago
Erdős apparently came up with the following poem to break the ice, which is pretty funny! This is the city of Madras / The home of the curry and the dal Where Iyers speak only to Iyengars/ And Iyengars speak only to God. Was that
9.
by ar813 6y ago
This was unfortunately the norm in his community at the turn of the century. A rather detailed study about the historical context of marriage among women in Ramanujam's community (Tamil Brahmins) is here: http://eprints.lse.
10.
by ar813 6y ago
I think the points raised are reasonable and, to my mind, not particularly partisan (though I would argue one party is more responsible for the current chaos by several orders of magnitude than the other one..). The deeper issue this raises
11.
by ar813 6y ago
Singapore is similar, in that pay for top public servants is competitive with top private sector pay. And they try to attract the best and brightest.
12.
by ar813 7y ago
I don't think it will reduce the need for energy storage. If it does, it might be in some marginal cases and by a small amount. This is because the power generated using this approach is quite a bit less than what you can get from sola
13.
by ar813 7y ago
Yes that distance matters in so far as getting the heat to the thermoelectric can be a bit more challenging. However I believe this has been investigated before and there are likely ways of doing it at least somewhat well.
14.
by ar813 7y ago
There was an analysis done on the theoretical (Carnot/ 2nd Law) limits of using Earth's infrared emissions in this way: https://www.pnas.org/content/111/11/3927.abstract (Roughly 4 W/m2 for a s
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by ar813 7y ago
Yep!
16.
by ar813 7y ago
One way to understand this cooling effect is that it occurs because at wavelengths where greenhouse gases are not substantially absorptive, heat can effectively escape out (or at least get absorbed and sent back to you at a higher altitude)
17.
by ar813 7y ago
Yes! Most natural materials have a relatively high emissivity at the infrared wavelengths associated with "typical" room / terrestrial temperatures. So in that sense, pretty much any material you might have (except for a high
18.
by ar813 7y ago
Hi there - I'm the lead author of this paper. Not a big fan of this particular write-up.. it's not a solar panel at all! But happy to answer questions. The NYT actually had a detailed write-up that I thought was quite accurate: h
19.
by ar813 8y ago
Following the Tolkien reference, migrants trying to cross the border are like Sauron’s army? Orcs? I’m not sure this world needs more ways of dehumanizing the desperate people and refugees seeking better lives.
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by ar813 9y ago
I admire the author's willingness to see possibilities for positive change here, including through restorative justice. It is especially admirable in the context of the fundamental violations and loss of trust that such harassment and
21.
by ar813 9y ago
Yes, it emits more radiation/ heat when hotter. A nice feature of radiation is that scales as T^4. It's pretty durable on its own. That being said, as we've moved to the product stage we've packaged it in a way to protec
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by ar813 9y ago
The great thing is that we can use existing manufacturing processes (which we are already using) to do this extremely cheaply at large volumes. So the cost at scale will be competitive and make economic sense for customers. Our focus is on
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by ar813 9y ago
You can still get cooling, but you get less heat rejection per unit area in high humidity because of the effect you point out.
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by ar813 9y ago
Sorry, that's the convention of the journal. It's W/m^2 -- heat rejection per unit area.
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by ar813 9y ago
I'm one of the authors / people working on this. Yep, radiators like the ones on the ISS are pretty much the dominant/only ways to get heat out in space. In response to your questions: yes, it can in fact cool below the ambie