c517402

21 ms·

61.
by c517402 9y ago
My friend who is a highway engineer would disagree with you. He says that roads will last a very long time as long as the shear limit of the road is not exceeded, but that once the maximum shear is exceeded the road will deteriorate. So, se
62.
100-year-old physics problem has been solved(m.phys.org)
192 points by c517402 9y ago|38 comments
63.
by c517402 9y ago
From the performance graph, it looks like they should be investing in Fortran.
64.
by c517402 9y ago
Maybe it could be used for those kiddy trains at amusement parks.
65.
by c517402 9y ago
Instead of using convolution to produce the imagery, I think it should be produced using fractional Fourier transforms. IIRC fractional Fourier transforms are mathematically equivalent to Fraunhofer and Fresnel diffraction integrals. Altho
66.
Wolf Evolution and “Settled Science”(blogs.plos.org)
2 points by c517402 9y ago|0 comments
67.
by c517402 9y ago
This is timely: https://xkcd.com/1846/
68.
by c517402 9y ago
This was a very old workspace. About every two cubicles there was a 15"x15"x8" box that sat on top of the cubicle wall and took about a minute to come up to full brightness. The top of the box was open and light reflected off
69.
by c517402 9y ago
One place I worked had indirect solar spectrum light that bounced light off the ceiling. That really seemed to keep my eyes from getting tired.
70.
by c517402 9y ago
> The only other product that deliberately leaves identifying traces that I can think of is ammunition. Taggants are used in some commercially produced explosives.
71.
by c517402 9y ago
IIRC what my mother said, sixty years ago high schools let students attend half days so they could do seasonal farm labor. That seems like something that could be re-instituted in areas that need seasonal farm labor.
72.
by c517402 9y ago
Exactly my question. Buried deep in location services is a frequently visited locations that apps have access to even if they only have access "only while using." http://www.iphonehacks.com/2016/10/how-to
73.
by c517402 9y ago
Of course everyone has two grandfathers and this one should not be overlooked: https://www.amazon.com/Methods-Mathematical-Physics-Vol-1/dp... And for more recent books I don't think this should be overlooked: ht
74.
by c517402 9y ago
I don't think I ever knew where this quote came from, but it stuck. "Computers let you make more mistakes faster than any invention in the history of mankind, with the possible exception of tequila and hanguns."
75.
by c517402 9y ago
Oklahoma is also one of the few states that has Pre-K. That is an extra year of state supported education for each student.
76.
by c517402 9y ago
Back when the only really powerful lasers that could be found for optical tables were IR, I know a couple of guys who lost enough of their retina to be considered legally blind from light they couldn't see. One of them told me, "Y
77.
One of the Worlds First Physics Books Just Sold for Just Over $790,000(gizmodo.com)
1 points by c517402 9y ago|0 comments
78.
by c517402 9y ago
For me: mac -> iPhone & iPad Non-mac PC -> probably Samsung phone & definitely not iPad
79.
by c517402 9y ago
Kai restaurant in Phoenix has the following the following 2 tasting menu options. Short story - $145/$250 with wine Journey - $245/$375 with wine and must be ordered by the entire table Maybe price has something to do with the lac
80.
by c517402 9y ago
Maybe I should have ended with a smiley, because I don't feeel tardy^H^H^H^H^H angry. I was just trying to point out that there is a way that "retroactive collection" can take place that isn't "judicially approved.&
81.
by c517402 9y ago
So, they archive the data and promise not to collect it (look at it) unless they have a national security letter signed by a judge^H^H^H^H^H drinking buddy from the office.
82.
by c517402 9y ago
I don't understand why the OP considers sneaky Pu239 production a proliferation problem, but doesn't consider unaccounted for tritium in the fuel cycle and the general availability of Li6 to bread more tritium a proliferation prob
83.
by c517402 9y ago
IIRC this the book Richard Feynman said he checked out of the library and learned calculus from. Also, Feynman made comments similar to those in the Prologue.
84.
by c517402 9y ago
Good to know
85.
by c517402 10y ago
There are corner reflector arrays on the moon that might make someone curious, if millions of years of moon dust doesn't effect them or they aren't destroyed by an asteroid impact.
86.
by c517402 10y ago
First sentence of abstract: "A negative effective mass ..." Maybe change the title from clickbait.
87.
by c517402 10y ago
If a footprint to produce reactor grade Uranium already exists, it could mask the footprint for something else. It might be easier to deplete a small percentage of Pu240, than to enrich reactor grade Uranium (4% U235) to a highly enriched f
88.
by c517402 10y ago
I take it that by 'exploited' you mean 'circumvented'. I would like to be more assured than "has never happened before." And, "low-burnup is required?" Separation of Pu239 and Pu240 is physically i
89.
by c517402 10y ago
In any reactor that contains U238, present day reactors and the hybrid reactors from the article, a neutron is absorbed to form U239. This quickly beta decays into Np239 (23.5 minute half-life). This then beta decays into Pu239 (2.3 day h
90.
by c517402 10y ago
Best race ever: Jenson Button wins in the rain in Montreal.

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