D_Alex

32 ms·

271.
by D_Alex 8y ago
Eh? Where is the source that today's electric vehicles are more dangerous in the event of an accident?
272.
by D_Alex 8y ago
For one, in the first case the government revenue should grow rather than decrease. For two, the taxes on one type of product may be justified by the societal costs of using that product. Compare for example cigarettes and chewing gum.
273.
by D_Alex 8y ago
As I have pointed out many times: the (crude) oil industry saved the whales!
274.
by D_Alex 8y ago
OK, I have thought about this a bit (I have worked on gas liquefaction plant design), and I do not believe this claim. 70% is about the maximum thermodynamic efficiency of any heat engine operating between -190 degrees and ambient. And the
275.
by D_Alex 8y ago
I see what they are getting at. My initial thoughts are: 1. There will be considerable losses in storage. Evaporation in LNG tankers is around 0.05-0.1% of their cargo capacity per day. This is around the same as the self discharge rate for
276.
by D_Alex 8y ago
Please note that there are powerful lobby groups in Australia that have interests in fossil fuel businesses and promote journalism that exaggerates problems with renewable energy. Eg see this: http://artsonline.monash.edu.au&#x2F
277.
by D_Alex 8y ago
>liquified air energy storage. I wonder if this may be helpful. Let me answer this: No, it would not be helpful, because on pretty much all metrics (capital and operating costs, efficiency, flexibility, size etc) this technology is way w
278.
by D_Alex 8y ago
Say you live in Ann Arbor, and have holiday houses in Portland, MA and Colorado Springs...
279.
by D_Alex 8y ago
We can produce natural gas, thence LNG, from natural gas reservoirs, which contain very little liquids. Eg. coal seam gas can be 95%+ methane, and essentially zero diesel.
280.
by D_Alex 8y ago
I have some information... 1. When methane is burned, the carbon dioxide emissions are about 30% lower per unit energy than when liquid fuels are burned (50 g/MJ for methane, vs abt 74 g/MJ for liquid fuels) 2. When LNG is produce
281.
by D_Alex 8y ago
What if a=1, b=10, c=100 - etc? Assuming the strings were English words...
282.
by D_Alex 9y ago
>The US is still the #2 manufacturer in the world. It is a clear #3 by population, so I don't know how significant that statement is.
283.
by D_Alex 9y ago
>I think 1/8 billionth of human effort could be directed to a great local burrito shop. But... that is not what the article was about - it suggested imitating an already successful business. Whether you love that or not, by the way.
284.
by D_Alex 9y ago
I completely disagree, but maybe we have different ideas of what a "great society" is.
285.
by D_Alex 9y ago
Plus, I don't think you can build a great society on the back of burrito and espresso shops...
286.
by D_Alex 9y ago
>I have no idea what the profit margins are but at 10 %... Profit margins do not give the correct picture, which is rather complex, and involves royalties, multiple layers of taxation, "production sharing agreements, etc. A good way
287.
by D_Alex 9y ago
And I also like planes with four engines.
288.
by D_Alex 9y ago
Since D=0.5at^2, going 10->8 would need a 50% increase in acceleration.
289.
by D_Alex 9y ago
>During my internship on automotive cost engineering, I quickly learned that motorized anything on a car costs and weighs leagues more than its mechanical-only cousin. That is not true these days, eg electric windows are cheaper than ma
290.
by D_Alex 9y ago
The fuel costs are a larger concern to the low cost airlines charging $300 round-trip, than to a supersonic service charging say $2500 round trip (this would represent a 75% saving over Concorde). The fuel consumption per seat mile of the C
291.
by D_Alex 9y ago
Maybe... but in Australia, the system must, by law, be installed by an accredited installer to be eligible for the "small scale technology certificates", a form of subsidy. This is currently worth about 45% of the pre-incentive c
292.
by D_Alex 9y ago
I think he is confusing "sex" with "stuff people go through to get sex"...
293.
by D_Alex 9y ago
I am SURE video games and, ahem, online activities are largely responsible for these trends. The amount of time spent on the computers/tablets/smartphones is staggering, and it has to come from somewhere.
294.
by D_Alex 9y ago
Based on the Australian experience, the next wave of price declines for residential solar will indeed come from balance-of-system cost declines, increased installation efficiency and lower profits. Current costs in Australia are about A$ 1.
295.
by D_Alex 9y ago
They mentioned 83 kWhr battery, a peak power usage of 80 kW, and a "normal flight", whatever that means, usage of around 20 kW. I should note that a conventional airplane rarely cruises at less than 50% power, 65-75% would be more
296.
by D_Alex 9y ago
Unfortunately, these 30 million are "men of marriageable age" (the imbalance is due to the practice of aborting female foetuses during the "one child" policy). This would mean perhaps 15-20% of young men are doomed to ba
297.
by D_Alex 10y ago
A gain, I would guess, because pretty much all cooling is run on electricity, whereas some of the heating is done by gas.
298.
by D_Alex 10y ago
Yes - I was just thinking the same thing. I have not come to a conclusion one way or another on whether it is possible to de-couple the generating program from the generated programs for the purpose of analysing the proof. It seems that the
299.
by D_Alex 10y ago
Infinity is a weird thing, isn't it? Now: one of the proofs in the paper relied on an assumption that all possible computer programs are countable, which I think implies that they are finite in length. But it is fairly trivial to gener
300.
by D_Alex 10y ago
>F1 is totally not the absolute pinnacle of car technology >Red Bull / Aston Martin and the AMG project will shame any F1 car You know, there is no objective measure of "pinnacle of technology", and F1 cars are complete

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