piadodjanho

6 ms·

1.
by piadodjanho 6y ago
Weirdly, those two codes behaves differently: $ gcc hn.c -O0 -o hn for (size_t i; i < (1ul<<46); i++) { printf ("%zd\n",i); acc += x; break; } Without break: $ gcc hn.c -O0
2.
by piadodjanho 6y ago
Hm. I don't know. My reasoning is about how much information can be encoded in the format. The IEEE-754 double format have 11 bits to encode the exponent and 52 bits to encode the fraction. Therefore, the multiplying factor from double
3.
by piadodjanho 6y ago
lol, how the compiler didn't warn about uninitialized variable
4.
by piadodjanho 6y ago
The issues I enumerated affects both nano and non-nano sunscreen with different degrees. The most commons concerns specific of the nano version are the skin absorption and free radical creation when expose to UV radiation -- not exclusive o
5.
by piadodjanho 6y ago
A sunscreen that blocks UVB, harm marine life [1] and can cause allergic airways inflammation [2] when breathed (inevitable when it dries on your skin) is hardly the best sunscreen in my option. My personal choice for to vitamin D synthesis
6.
by piadodjanho 6y ago
The the most commonly used sunscreen chemical have hormone like activity [1]. https://www.ewg.org/sunscreen/report/the-trouble-with-sunscr...
7.
by piadodjanho 6y ago
NaN is NaR (not a real) in posit notation.
8.
by piadodjanho 6y ago
Yeah. Gustafons is like, memory is cheap, just use a few hundreds of kb to store the quire. To be fair, he is not HW guy.
9.
by piadodjanho 6y ago
I looked at the asm generate from my original example and they generate very different codes, gcc applies other optimization when compiled with -O1. I've been fighting the compiler to generate a minimal working example of the subnormal
10.
by piadodjanho 6y ago
He also propose the use of an opaque register to accumulate (quire), in contrast to the transparent float register (its a mess, each compiler does what it think is best). When working with numbers that exceed the posit representation you us
11.
by piadodjanho 6y ago
In practice, subnormal are very rarely used. Most compiler disable subnormals when compiling with anything other than -O0. It takes over a hundred cycle to complete an operation. Demo: #include <stdio.h> int main ()
12.
by piadodjanho 6y ago
Also a great format to count how many representation are wasted with redundant representation (ZeroS, NaN, +inf, -inf).
13.
by piadodjanho 6y ago
Ackchyually... The IEEE-754 has a lot of redundant representation. Not where you would expect though. Caveat: Those features are invaluable for some niche applications, but not for the average joe. To start. Every IEEE-754 float has two zer
14.
by piadodjanho 6y ago
The Solar Zenith Angle is the most important. This is what changes from winter to summer and morning to night. Vitamin D production is only made on the UVB range that is highest at midday. Both UVA and UVB causes erythema. Counterintuitivel
15.
by piadodjanho 6y ago
I've read a few paper on this subject you are absolutely correct, I don't know why you are have been downvoted. Vitamin D is only produced with in UVB wavelength [1]. No vitamin D is produced over 318nm. I wonder if that's th
16.
by piadodjanho 6y ago
Not for vitamin D production. Vitamin D is produced on UVB spectrum [1 Fig. 1] that decreases with the solar azimuth degree [2]. [1] https://www.direct-ms.org/wp-content/uploads/2018/01/Vit-D-s... [2] h
17.
by piadodjanho 6y ago
Adding some information for those interested in more precise numbers. This paper [1] has the recommended exposure time for a few cities in Australia. If you live in the same latitude, as long you live in the same latitude, this can be used
18.
Pandemic Reporting: Crisis Communication (2010)(nieman.harvard.edu)
2 points by piadodjanho 7y ago|0 comments
19.
by piadodjanho 7y ago
The page says its twice the traditional Cloud.
20.
by piadodjanho 7y ago
Any suggestion on what Prolog to use?
21.
by piadodjanho 7y ago
What are the differences from Prolog for a constraint programing language such MiniZinc?
22.
by piadodjanho 7y ago
The supreme court judges already stated that Gleen Greenwald cannot be investigated because the reporting. The police got this conversation from a backup kept by the hackers. There is no chance this accusation will be accept by a judge, it
23.
by piadodjanho 7y ago
I should made it clearer that Gleen Greenwald that was not hacked. I described the procedure the hackers used to access the politicians conversations. Not GG's. In one interview, Gleen Greenwald said the computer with the copy of the d
24.
by piadodjanho 7y ago
Ironically, he Intercept published conversations from another news site with their source. They use the argument "the law protects the secret of the source", yet reveal others sources.
25.
by piadodjanho 7y ago
The accusation [1] is public. I will translate the highlight parts of the conversation transcription between the hacker and Gleen Greenwald. In another thread I discussed how they hacked the Telegram accounts. Page 58: > MOLIÇÃO: Like it
26.
by piadodjanho 7y ago
In case someone is wondering how they hacked Telegram. They used caller id spoofing and a telco vulnerability. 1. Change your phone ID and try to login on Telegram; 2. Telegram will send an SMS with an authentication number followed by a ph
27.
by piadodjanho 7y ago
I just read the part of accusation that was used to indicted Gleen Greenwald. There is no proof of collusion with the hacker. Actually in his communication with the hackers, he was very cautious . Also, the Supreme court had decided GG coul
28.
by piadodjanho 7y ago
This is not about the journalist knowing the information was obtained illegally. This is about the journalist asking the hacker to get information from people of interest.
29.
by piadodjanho 7y ago
To be political prisoner you need to be in prison first. This might be a political persecution, but saying he is a political prisoner is a bit of stretch. It will take several years for his case to be appreciate by every last instance (in B
30.
by piadodjanho 7y ago
Is is legal for a journalist to ask for a hacker to get some private information about chosen politician in America? (Serious question).

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