Want to read Slashdot from your mobile device? Point it at m.slashdot.org and keep reading!

 



Forgot your password?
typodupeerror
DEAL: For $25 - Add A Second Phone Number To Your Smartphone for life! Use promo code SLASHDOT25. Also, Slashdot's Facebook page has a chat bot now. Message it for stories and more. Check out the new SourceForge HTML5 internet speed test! ×

Comment Re:What would be even better would be... (Score 1) 78

I think you are failing to understand:

"Attenuated S4" means you get less S4 sleep (the kind you need).

Please read it again. It was the high 6700K color temperature (i.e. not f.lux) that reduced good sleep, while the 3000K color temperature (e.g. f.lux) increased good sleep. This means f.lux is good for sleep.

"not statistically significant" -- removing the blue did nothing useful -- "exposure to the computer monitor only was reduced slightly relative to the dark control condition" -- the computer monitor putting out the blue light was the same as not having the thing on at all: blocking the blue did nothing useful.

Granted that it wasn't statistically significant, perhaps due to a small sample size, but the measured effect was in the direction of f.lux (blocking blue light) being good for sleep. They emphatically did not find that f.lux was bad for sleep.

" lower color temperature bright light exposure during a night rest break led to a reduction of subjects' arousal level during the subsequent work." -- you have to intentionally get up in the *middle* of a sleep cycle for there to be any effect; prior to a sleep cycle, there was no effect. This is basically "If you wake up in the middle of the night, you are less alert the next day". That's a big "duh".

You are misunderstanding the experiment. The subjects worked from 11pm to midnight, then took a break from midnight to 1am, then worked again from 1am to 2am. Being exposed to f.lux-like light during the hour break made them sleepier. So yes, obviously, f.lux is bad for staying awake if you're trying to stay awake. But the direct implication is that f.lux is good for going to sleep if you're trying to go to sleep. So again, f.lux is good (for its intended purpose, which is to use it before sleep).

Comment Re:What would be even better would be... (Score 1) 78

In the early phase of the sleep period, the amount of stage-4 sleep (S4-sleep) was significantly attenuated under the higher color temperature of 6700 K compared with the lower color temperature of 3000 K."
https://www.ncbi.nlm.nih.gov/p...
== color shift by fl.ux and others: bad for sleep

No, this means f.lux is good for sleep. "Attenuated" means reduced. High color temperatures (i.e. not f.lux) reduced good sleep, compared to lower color temperatures (e.g. f.lux).

"Melatonin concentrations after exposure to the blue-light goggle experimental condition were significantly reduced compared to the dark control and to the computer monitor only conditions. Although not statistically significant, the mean melatonin concentration after exposure to the computer monitor only was reduced slightly relative to the dark control condition."
https://www.ncbi.nlm.nih.gov/p...
== color shift by fl.ux and others: bad for sleep

No, this means f.lux is good for sleep. The "dark control condition" was the orange-tinted glasses, creating f.lux-like conditions. The "blue-light goggle" condition was a goggle that _added_ blue light, the opposite of f.lux. Read the abstract again.

"After exposure to bright light of 3000 K but not at other color temperatures, the EEG alpha1 band ratio and the beta band ratio at 02:00 h were higher and lower, respectively, than that at 01:00 h. These findings indicated that lower color temperature bright light exposure during a night rest break led to a reduction of subjects' arousal level during the subsequent work."
https://www.ncbi.nlm.nih.gov/p...
== color shift by fl.ux and others: bad for sleep

No, this means f.lux is good for sleep. Lower color temperature (e.g. f.lux) made people more sleepy.

...many of the other articles were self-published by companies and associates selling products like fl.ux and "Blue Blockers".

No one sells f.lux. f.lux is free software. I am happy to link to it here: www.justgetflux.com

Comment Re:Gearbox in electric car (Score 4, Informative) 136

20%, not 30%. Wind resistance increases with the cube of speed, but energy-per-mile efficiency (assuming all energy is spent fighting wind resistance) is only squared. That's because you spend less time driving a given distance at higher speed.

The Tesla P100D's dual motors combine for 760 horsepower, which would be more than enough to sustain 200mph+ with proper gearing and tires. By comparison, a Lamborghini Gallardo achieves a top speed of 202mph with just 562 horsepower. The Tesla's motors redline at about 16000rpm, which at the 9.7:1 fixed gearing ratio corresponds to about 155mph. If the gearing ratio were halved, the low-speed acceleration would reduce but the top speed would go up dramatically.

True, at 200mph the P100D battery pack would only be good for about 40 miles. But gas supercars don't do much better. At top speed, a Bugatti Veyron can burn through an entire 26-gallon tank of gas in just 12 minutes (51 miles).

Comment Re:AKA (Score 1) 304

So if we're hypothesizing replacing all ICE vehicles with EVs, we need 30x as many Supercharger plug-in spaces as there currently are gas pumps along major highways.

Taking into account both home-charging and destination-charging, I think you're right back down to 1x. On top of that, charging speeds will only ever get faster over the next 5-10 years. So there will likely never need to be as many EV supercharging spots as there are gas pumps now.

Comment Re: Trump is already a uniter (Score 1) 637

Even the URL contains the word "purports", which casts doubts on the accuracy, which is highly questionable based on the source of the video. The content of the highly-questionable video even explicitly says it was not about the 2016 election.

Comment Re: In unrelated news... (Score 1) 203

I'm not sure if you read the summary, but protestors lit a number of construction vehicles on fire, causing $2.5 million in damage.

IMO, once you start setting things on fire and breaking shit, you should be referred to as a "rioter", not a "protester". I'm not sure where the line is on that one, but a lot of recent "protests" have crossed it and no one seems to say anything about it.

Slashdot Top Deals

It is better to live rich than to die rich. -- Samuel Johnson

Working...