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Speed of C programs, relative to Java
I tried the -ffast-math option. It makes the C-code somewhat faster.
Solving 100M quartics, plus ... |
12-12-2023 at 11:23
by: woelen |
Speed of C programs, relative to Java
I'll try compiling with the -fassociative-math option or the -ffast-math option. Sounds interesting. ... |
12-12-2023 at 07:55
by: woelen |
Speed of C programs, relative to Java
After searching a lot on the internet I think I found a possible answer to my question. It seems tha ... |
12-12-2023 at 07:40
by: woelen |
Speed of C programs, relative to Java
@Keras: I actually am in the process of improving some of the best polynomial root finders available ... |
11-12-2023 at 14:46
by: woelen |
Speed of C programs, relative to Java
No, I do not convert ints to longs. It mostly is floating point (doubles) arithmetic, and a little i ... |
11-12-2023 at 06:12
by: woelen |
Speed of C programs, relative to Java
I am working on a library for polynomial root finding (soon, more will follow on that on sciencemadn ... |
11-12-2023 at 04:20
by: woelen |
shelf live LiALH4
From my own experience I can say that LiAlH4 has unlimited shelf life if it is kept absolutely dry a ... |
7-12-2023 at 02:03
by: woelen |
Koh and dcm
I have personal experience with CH2Cl2 and hydroxide. They do not react with each other, not when th ... |
1-12-2023 at 02:03
by: woelen |
What happens to capacities of batteries when connected in series or parallel?
Connecting batteries in parallel must be done with care. Especially if one battery is drained more t ... |
22-11-2023 at 03:57
by: woelen |
Laboratory power supply constant current
You could use current-based LED drivers. They are very efficient and allow the resistance of the loa ... |
22-11-2023 at 03:55
by: woelen |
Reaction of Persulfates with Magnesium and other metals
if you mix solid Mg with solid Na2S2O8, then the first main reaction will be
Mg + Na2S2O8 --> ... |
22-11-2023 at 00:20
by: woelen |
Notice: Subforum reorganization
We could create one other section, called "Non-chemistry amateur sciences", holding the following su ... |
21-11-2023 at 02:08
by: woelen |
Notice: Subforum reorganization
We could rename this section, to include all kinds of things you mentioned. My suggestion: "Nuclides ... |
21-11-2023 at 01:58
by: woelen |
Persulfate oxidation? Permanganate
Here you nicely see that at high pH, Mn(2+) is easily oxidized. The brown stuff at the left you see ... |
18-11-2023 at 09:21
by: woelen |
Persulfate oxidation? Permanganate
Interesting observation.
So, alkaline oxalate solution, when added to a manganese(II)/peroxide mi ... |
16-11-2023 at 07:25
by: woelen |
Understanding (1+1) Reagent
This "(a+b)" convention indeed is horrible.
What do they mean with "(1+1)" HCl? You say 1 volume of ... |
15-11-2023 at 04:47
by: woelen |
Persulfate oxidation? Permanganate
Indeed, making permanganate from persulfate and manganese(II) requires silver-ions as catalyst. Even ... |
15-11-2023 at 04:37
by: woelen |
On the heating of Arsenic in H2SO4
Making AsCl3 in a home-setting, while I read this in the "beginnings" subforum???  Don't do this ... |
9-11-2023 at 02:50
by: woelen |
On the heating of Arsenic in H2SO4
@6dthjd1: If I read your posts, then it really raises my concerns. If you had white 'frost' on your ... |
8-11-2023 at 00:22
by: woelen |
Electrochemical method to Iron Chlorides? (my first post btw)
Why make iron chloride? Ferric chloride (FeCl3.6H2O) is available in nearly every part of the world ... |
2-11-2023 at 00:59
by: woelen |
Weird things during nitric acid synthesis
The blue color in the water trap most lkely is due to formation of N2O3. This stuff can exist in dil ... |
31-10-2023 at 01:21
by: woelen |
Exotic Oxidizers
Please do not do unwise things! Mixing crushed trichloroisocyanuric acid (TCCA) or one of the derive ... |
19-10-2023 at 09:40
by: woelen |
The situation with the delivery of parcels from Russia (www.chemcraft.su)
As far as I know they only accept cryptocurrencies at the moment. |
10-10-2023 at 09:46
by: woelen |
Differentiating K2CO3 and CaCl2
If you have just a pinch of K2CO3 in KCl, then I do not expect that it will make the solid deliquesc ... |
7-10-2023 at 10:46
by: woelen |
Differentiating K2CO3 and CaCl2
K2CO3 bubbles in vinegar as vigorously as Na2CO3. So, you only have a little amount of carbonate in ... |
5-10-2023 at 09:22
by: woelen |
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