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Lessons Learned From Google's Green Energy Bust

samwichse Re:What it means (215 comments)

"Between 1969 and 1975, Bill Brown was technical director of a JPL Raytheon program that beamed 30 kW of power over a distance of 1-mile (1.6 km) at 84% efficiency."

From the Wikipedia article on space-based solar.

84% by microwaves isn't as good as wires, but it's not terrible.

2 days ago
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Philae's Batteries Have Drained; Comet Lander Sleeps

samwichse Re:Fair-weather power sources are lame... (337 comments)

The payload mass of Philae was only 21kg. So we've just kicked half the science off the lander for an RTG (assuming at least 3kg for the solar panels).

2 days ago
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Study: Body Weight Heavily Influenced By Heritable Gut Microbes

samwichse Re: Oh no (297 comments)

Ignoring the fact that income taxes were way higher in the 50's, of course.

Pointing that fact out makes obligate fools lose coherence.

about two weeks ago
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CNN Anchors Caught On Camera Using Microsoft Surface As an iPad Stand

samwichse Better spin from MS: (236 comments)

"Even Apple lovers have to admit that Microsoft's Surface 3 is a stable platform."

Sam

about two weeks ago
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Ask Slashdot: Can You Say Something Nice About Systemd?

samwichse Re:It freakin' works fine (928 comments)

Make sure all users are members of the 'pulse-access' group, and enable system mode in /etc/default/pulseaudio and reboot

about three weeks ago
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Alienware's Triangular Area-51 Re-Design With Tri-SLI GeForce GTX 980, Tested

samwichse Re:It's a space heater. (138 comments)

ROFL you really don't know much about heat pumps do you?

about three weeks ago
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Alienware's Triangular Area-51 Re-Design With Tri-SLI GeForce GTX 980, Tested

samwichse Re:It's a space heater. (138 comments)

Oh my, what a dumbass I am.

I've only turned 1kw of electricity into 1kw of WORK instead. Work moving heat against a gradient from outside the house to the inside.

God I'm such a dumbass I never learned anything about phase change heating/cooling systems.

I sure couldn't have looked this up on wikipedia by typing "heat pump COP" into Google and clicking the first link!

http://en.wikipedia.org/wiki/H...

Wow am I stupid!

about three weeks ago
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Creationism Conference at Michigan State University Stirs Unease

samwichse Re:It makes you uneasy? (1007 comments)

They don't have to say they are university-sponsored.

They'll just state:

"At a conference held at Michigan State University, Dr ________ and Dr ________ , agenda agenda agenda."

See, the conference really was held at Michigan State University, right there in their very facility. Yet there's a co-opting of the university's authority because of the _implication_ that it was sponsored. Lies within truth.

about three weeks ago
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Alienware's Triangular Area-51 Re-Design With Tri-SLI GeForce GTX 980, Tested

samwichse Re:Fuck it, I'm out (138 comments)

Even better is the bit about the angled face making it easier to draw cooling air in.

You just outed yourself as paid marketing fluff, Slashdot and hothardware, because nowhere have I ever seen it more efficient to draw cooling air downward against the rising heat gradient.

BS.

about a month ago
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Alienware's Triangular Area-51 Re-Design With Tri-SLI GeForce GTX 980, Tested

samwichse Re:It's a space heater. (138 comments)

It is your misunderstanding, unless by electric heat your mean resistive heat?

Baseboard heaters are the same efficiency, go ahead, run as server farm. Their Coefficient of Performance (COP) is essentially 1.

But a modern electric heat pump (last 10 years) should give you at a COP of at least 3, meaning for 1 kw electricity, it will pump 3 kw of heat into your house.

So heating your house with computers will triple your heating bill/energy usage.

about a month ago
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Rite Aid and CVS Block Apple Pay and Google Wallet

samwichse Re:Good luck with that. (558 comments)

I think you have that backwards.

Credit cards give me a free loan (less than a month) while my money's still in my bank account earning interest.

Don't spend more than what's in your bank account (just like normal cash flow management!) and pay your whole balance at the end of the month. Problems pop up? File a dispute or reverse charges.

Sam

about a month ago
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Tesla Announces Dual Motors, 'Autopilot' For the Model S

samwichse Re:Performance (283 comments)

6g cornering? I know that's not right...

http://www.formula1.com/inside...
"A modern Formula One car is capable of developing 3.5 g lateral cornering force (three and a half times its own weight) thanks to aerodynamic downforce."

about a month and a half ago
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Former Infosys Recruiter Says He Was Told Not To Hire US Workers

samwichse Re:Well duh. (293 comments)

My office hosts a lot of visiting international workers. Mostly from China.

It's pretty clear after working with them for a while and listening to them talk that American = white to them.

It's very weird, because my cube-mate (right across from me) is black. They would say to us both... inappropriate things like: "Americans have such pale skin" and we would both just kind of look at each other in bafflement as to what to say to that.

Sam

about a month and a half ago
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Send Your Own Radiosonde 90,000 Feet Into the Sky (Video)

samwichse Re:Ion Thruster (48 comments)

JP Aerospace thought enough of the idea to study it and run computer simulations:
http://www.today.com/id/502538...

About 2/3 down the page under the heading "Getting to Orbit"

""What if you flatten it out and give it a little bit of aerodynamic shape, and point it up a little bit so you have some of that thrust turned into lift?" Powell asked. "As you climb up, your drag is dropping, and now you're accelerating. The question comes, can you get aerodynamically clean enough, while still supporting the lift enough to slowly get faster and faster ... to get all the way to orbit? Is there a drag-power combination to do that? We think there is. It looks like there's a wide margin.""

"To achieve orbital flight, the craft would require a spaceworthy propulsion system — something more substantial than helium and propellers. Powell would turn to the type of continuous-thrust ion propulsion system used on NASA's Deep Space 1 and the European Space Agency's SMART 1 moon probe. Based on computer simulations with different configurations, he contends that such engines could drive the mega-balloon to orbit in three to nine days."

about a month and a half ago
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Fuel Efficiency Numbers Overstate MPG More For Cars With Small Engines

samwichse Re:MPG estimates based on driving like an idiot? (403 comments)

No, they're claiming that the UK test cycle is overly optimistic (which is very true!), the article with the original data is here, and contains a similar chart for the EPA cycle. Spoiler: it's dead-on accurate, most people do indeed drive like idiot jackrabbits:

http://emissionsanalytics.com/beware-the-danger-of-downsizing/

USA
Eng(L) Var    Real MPG
1-2    2%     34.0
2-3    -1%    28.2
3-4    0%     21.5
4-5    3%     20.1
5-6    -3%    17.5
6+     1%     16.9
Avg    0%     23.0

about a month and a half ago
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Fuel Efficiency Numbers Overstate MPG More For Cars With Small Engines

samwichse Re:Why are EPA estimates inaccurate? (403 comments)

The EPA tests aren't inaccurate though. The original article (not the one Slashdot linked) has more data, including a comparison with the same test cycle data but using the EPA cycle vs real world MPG. Spoiler: it's almost dead on accurate:

USA
Eng(L) Var    Real MPG
1-2    2%     34.0
2-3    -1%    28.2
3-4    0%     21.5
4-5    3%     20.1
5-6    -3%    17.5
6+     1%     16.9
Avg    0%     23.0

Source:
http://emissionsanalytics.com/beware-the-danger-of-downsizing/

about a month and a half ago
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Fuel Efficiency Numbers Overstate MPG More For Cars With Small Engines

samwichse Re:Original link has more data (403 comments)

And, the EPA test cycle is far more accurate than the UK one:

USA
Eng(L) Var    Real MPG
1-2    2%     34.0
2-3    -1%    28.2
3-4    0%     21.5
4-5    3%     20.1
5-6    -3%    17.5
6+     1%     16.9
Avg    0%     23.0

about a month and a half ago
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Fuel Efficiency Numbers Overstate MPG More For Cars With Small Engines

samwichse Re:Its the TEST! (403 comments)

If you look at the original article, not the one slashdot linked, you'd find a comparison to the EPA test cycle numbers at the bottom. The EPA test cycle appears to be about as spot on as I would ever hope for:

USA
Eng(L) Var    Real MPG
1-2    2%     34.0
2-3    -1%    28.2
3-4    0%     21.5
4-5    3%     20.1
5-6    -3%    17.5
6+     1%     16.9
Avg    0%     23.0

about a month and a half ago
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Fuel Efficiency Numbers Overstate MPG More For Cars With Small Engines

samwichse Re:Yransportation efficiency (403 comments)

See: Elio Motors

about a month and a half ago

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