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🦁 Leo C. Stein
@duetosymmetry
, 5 tweets, 2 min read Read on Twitter
One cool bit of science you can learn from the #GravitationalWaves from neutron stars is about the "equation of state" of nuclear matter 1/?
this is something that simply can't be measured directly in labs or colliders on Earth. Astronomy is the only direct way to measure it. 2/?
How fast the inspiral happens encodes how "squishy" are the neutron stars. This is called the tidal deformability. 3/?
Figure 5 from the PRL has the inference about the tidal deformability, and predictions from various theoretical models: 4/?
has now started to do nuclear physics! #GravitationalWaves #GW170817 5/5
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Maximiliano Isi
@maxisi
Besides #GravitationalWaves from pairs of black holes & neutron stars, @LIGO and @ego_virgo could detect the combined rumble of the many sources that are too far away (hence too faint) for us to distinguish individually. We call this a “stochastic background” (1/N)
This stochastic background of gravitational waves is almost like the pitter-patter of rain on a tin roof, or the drumming of popcorn: many individual short sounds adding up to a noisy whole (2/N)
As a more scientific analogy, this is also similar to the cosmic microwave background (CMB): noisy radiation produced in the early universe that reaches from all directions. Except instead of light, the stochastic background we look for is made of gravitational waves! (3/N)
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Erik Loomis
@ErikLoomis
This Day in Labor History: July 17, 1944. A munitions explosion at the Port Chicago Naval Magazine in Port Chicago, California killed 320 mostly African-American soldiers. Let's talk about black labor in the military and how black lives haven't mattered to the US, then or now.
Is military work part of labor history? It’s not something we usually consider. For one thing, soldiers don’t produce profit for capitalists, although one could broadly argue that the U.S. military serves capitalist goals and soldiers are the capitalists’ shock troops.
That’s more of an ideological argument than a practical one. Soldiers aren’t traditional workers. But they do work. They labor and they get hurt and die on the job. They also have almost no way to protect themselves as workers.
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Iatrogenic
@Dr_Blackjack
#Science vs #BJP

Bjp is party very educated party consisting of scientists , researchers,doctors , IITians , Oxford topper economist.
Here we have some of important theories nd reserch done by important organisation.
One of our very intelligent after a years of hard work in his lab with his Braille book found out dat natural calamities can b prevented by reading hanuman chalisa.

Another important member of our research team.after working yr on theory of evolution,he concluded dat theory is false. few of illiterate were unhappy about his remark.

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JesseJenkins
@JesseJenkins
Im seeing more discussion on possibility of using (smaller) #nuclear reactors to generate heat (instead of electricity) to eventually help decarbonize district heating (& cooling via evap. chillers), industrial process heat, etc. I've wondered: what are the economics? #thread 👇
Heat is much less valuable then electricity. Then again, a nuclear plant is a great heater! Only about 33% of heat generated by a reactor is converted to electricity. So would it be worth it to produce heat instead of power?
There are 3412 Btus per kWh of electricity. So 1 MMBtu = 293 kWh. One kWh wholesale electricity sells for say 3-6 cents. So that's about $8.80-17.60 per MMBtu of electricity sold.
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JesseJenkins
@JesseJenkins
Six #nuclear reactors closed since 2013. By my count, up to 23 more reactors may retire w/o policy or market conditions improving: 21.6 GW = ~1/5th of US fleet, 4% of US #electricity--and crucially, 12% of emissions-free generation.

So what's killing nuclear power in the U.S.?
In a new @MIT CEEPR paper -- 1 part #energy #economics & 1 part film noir murder mystery! -- I provide the 1st empirical estimates of what's driving down #electricity market prices & killing profitability of 19 #nuclear power plants across @pjminterconnect ceepr.mit.edu/publications/w…
You can read a short policy brief summarizing the paper & key conclusions @MIT CEEPR here: ceepr.mit.edu/files/papers/2…

Abstract & paper here: ceepr.mit.edu/publications/w…

Slides presented at #ASSA2018 here: dropbox.com/s/b6192hrvn331…
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Roshi CBG-san
@OnlyNakedTruth
Today's thread

Measurement of time.
How current calendars can't match ancient Hindu timekeeping.

Why a day isn't always 24 hours long

Why a year doesn't have 365.25 days

#science #astronomy #Time
1/n
How long does a day last everyday? 24 hours? Wrong.

We define day as the time taken by Earth to complete one rotation around its axis.
But with respect to what is the measurement made? 2/n
Since Earth is also revolving around Sun while it is rotating, it needs to rotate a little extra when rotation is measured w.r.t. sun (solar day) than a distant star (sidereal day)
3/n
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