z*h
发帖数: 773 | 1 The lightest batteries based on energy density may be metal air batteries,
such as Li, Al, Zinc, etc. (Here the upper limit of energy density is their
combustion energy with some discount). But energy release may be hard to
control, expect Zinc. The most important thing is very high energy
consumption for regeneration of metal (Regeneration costs cannot be
decreased greatly due to thermodynamics and technology maturity after 100
year development). So they cannot be used for regular cars.
Airpla |
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z*h
发帖数: 773 | 2 After reading the history of Wright Brothers, they deserved their honor
because they knew the latest technology for this topics very well, and
conducted a number of experiments from aerodynamics, internal combustion
engines (they made it by themselves by using Al rather than steel), to
flight controlling (based on their bicycle-building skills). Finally they
combined them together and achieved the goal. |
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z*h
发帖数: 773 | 3 Energy densities are available in Wikipedia. Read it and think of it. If you
want to check conversion efficiency, I have a list here.
Input Output Conversion efficiency
e m large electrical motors 90-97
m m overshot waterwheels 60-85
e m small electric motor 60-75
t m large steam turbines 40-45
c m large gas turbines 35-40
c m diesel engines 30-35
c m best large steam engines 20-25
c m internal combustion engines 1 |
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z*h
发帖数: 773 | 4 It is called serial hybrid vehicle, better efficiency than Toyota Prius. But
internal combustion engineer efficiency is limited by the second law of
thermodynamics. For gasoline otto engine, the highest efficiency is only 32%
, lower than diesel ICE. |
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O*******d
发帖数: 20343 | 5 英国当初有汽车时，大家认为汽车太危险，需要一个人在前边走路摇旗开路才能上路行驶。
In the United Kingdom, the Locomotive Acts (also known as Red Flag Laws), a
policy requiring self-propelled vehicles to be led by a pedestrian, waving a
red flag or carrying a lantern, to warn bystanders of the vehicle's
approach. The Red Flag Law was repealed in 1896, by which time the internal
combustion engine was well into its infancy.[1]
http://en.wikipedia.org/wiki/Red_flag_laws |
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k*******1
发帖数: 526 | 6 我也没说我计算阿，你们提出来到，胸口碎石是魔术，又有初中物理推导做论据，我质
疑那个推导，应该你们做计算验证才对啊，哈哈
我根本不会计算? 您又开始喷了吧，别的不行，FEA我还真会，design anlysis, Fit
for service天天都在做。甚至CFD,combustion, reactive flow也做过模拟 |
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s******r
发帖数: 5309 | 7 一直很喜欢Peter Lee 的文章。
Japan poured oil on troubled waters
By Peter Lee
In the fuss over Japan's detention of the Chinese fishing vessel and its
captain, Zhan Qixiong, after a scuffle
near the Diaoyutai/Senkaku Islands, the world received a foretaste of how
World War III might break out in
the China Sea.
All it takes is a confrontation at some contested but otherwise
insignificant rock, a combustible combination
of rhetoric, provocation, and retaliation, an American propensity for
meddling, and the |
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p******u
发帖数: 14642 | 9 菜地的儿子也很油菜
http://energyfromthorium.com/2011/01/30/china-initiates-tmsr/
China Initiates Thorium MSR Project
Published in Coal Strategy Thorium Uranium-233 by Kirk Sorensen on January
30th, 2011
The People’s Republic of China has initiated a research and development
project in thorium molten-salt reactor technology, it was announced in the
Chinese Academy of Sciences (CAS) annual conference on Tuesday, January 25.
An article in the Wenhui News followed on Wednesday (Google English
translation). C... 阅读全帖 |
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s****i
发帖数: 2993 | 10 my gas furnace is about 40 hp, 8 times of my lawn mower and 36 times of my
internal combustion engine on trimmer. |
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s****i
发帖数: 2993 | 11 no, it only shows you were saying something that you don't know a shit.
a 5 hp mower can't heat my well insulated 2000 sq ft house. it can't heat a
very poorly insulated bus either.
buses up north use auxiliary heaters, not their "internal combustion energy"
. the aux heater have similar output of a house furnace. |
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t***h
发帖数: 5601 | 12 http://www.spacenews.com/launch/110301-nasas-glory-satellite-lo
Rocket Fairing Glitch Dooms NASA's Glory Mission
WASHINGTON -- NASA's $424 million Glory climate observation satellite was
lost in a March 4 launch attempt from Vandenberg Air Force Base, Calif.,
after the shroud designed to protect the spacecraft during its climb to
orbit atop a Taurus XL rocket failed to separate, agency officials said.
The Taurus XL, built by Orbital Sciences Corp. of Dulles, Va., was making
its return to flight ... 阅读全帖 |
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t******t
发帖数: 15246 | 14 标题：中国面向未来的计划（China’s Plan for the future）
中国一直在推进那个能让自己拥有世界上最长的高速公路系统的计划。
China is still moving ahead with plans that will give it the world’s
biggest highway system.
随着中国经济的快速增长，能让这个国家一直在动也成了政府的首要任务。在过去几十
年的基建浪潮中，车辆的数目也在快速增长，而现在有了些制约因素。
许多人都会想到史上最糟糕的交通堵塞：2010年8月，京藏高速公路上的大堵车，绵延
100公里，被堵20天。造成这个混乱的原因是铁路线出了问题，几百辆卡车通过公路从
内蒙向北京运煤。
中国在2009年已经取代美国成为最大的轿车和面包车（厢车）市场，当年全国共有1360
万辆车售出。因此去年北京启用新的规定来限制车辆的购买。相关人员介绍：2011年只
有24万购车上牌名额，是2010年的三分之一。
尽管如此，中国仍在快速发展她的铁路和公路链，最新的估计，2020年公路网络会完工
，到那时，中国会增加129万公里的普通公路（... 阅读全帖 |
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l*******t
发帖数: 717 | 15 In 1979, the city researched the construction of a dome over the entire city
of Winooski, to reduce heating costs during the winter. The proposed dome
would have been 200 feet (61 m) at the center, and internal combustion
engines would have been banned.[8] Though the dome was never built, to this
day the city's planner defends the concept, insisting "Economically, it's a
slam dunk," and adding "You could have had year-round fly-fishing. |
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r********n
发帖数: 7441 | 16 前期模型的吹风是在以色列做的，后期在俄罗斯做
The first aerodynamic wind-tunnel test was held in Israel (2007) and later
in Russia (2009) as India doesn't have a hypersonic facility to test larger
cross-section of platforms. "Next year some more missions are planned in
Russia, including stage separation and air intake tests. We are also
planning a full-scale panel-separation test at DRDL itself," sources told
Express.
The scientists have already proved technologies for aerodynamics, aero-
thermodynamics, engine and ho... 阅读全帖 |
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u***r
发帖数: 4825 | 17 http://www.nytimes.com/2011/12/27/business/global/chinas-push-f
GUANGZHOU, China — Three years ago, as part of its green-energy policy, the
Chinese government set an ambitious goal: by the end of 2011, the nation
would be able to produce at least 500,000 hybrid or all-electric cars and
buses a year.
With only about a week to go, it is clear China will fall far short of that
target. Despite dozens of electric-vehicle demonstration projects around the
country, analysts put China’s actual annual pr... 阅读全帖 |
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h***y
发帖数: 4936 | 18 正好版上在讨论能源，煤制天然气这个感觉并不可持续的能源转换方式为什么最近很热
门？
首先是一家麻省的小公司刚拿了国内一个大订单。
Bluer Skies For Shanghai? U.S. Start-Up Strikes $1.25 Billion Deal To Turn
Chinese Coal Into Natural Gas
“GreatPoint Energy on Friday announced its $1.25 billion partnership with
industrial conglomerate China Wanxiang Holdings to build a large-scale plant
that should produce about 0.5% of China’s projected energy needs by 2015,
according to the companies.”
---------------
http://blogs.wsj.com/venturecapital/2012/02/20/bluer-skies-f... 阅读全帖 |
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w*********g
发帖数: 30882 | 19 Un-White America: Will Blacks and Hispanics lead the USA to ruin
http://www.theburningplatform.com/?p=40398
I think ol’ Fred may be on to something here. Does that make me a racist?
========================
I begin to weary of the endless denunciations of “white privilege;” the
calls to end the dominance of malignant white men; the law suits to abolish
all tests on which white men excel, meaning almost any test of mental
ability; to make universities and police forces and advanced-placement
clas... 阅读全帖 |
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R****a
发帖数: 6858 | 21 History of World GDP
by Barry Ritholtz - August 17th, 2010, 3:00pm
inShare
7
Email This Post
Print This Post
Via the Economist, we see this intriguing histogram of Global GDP (below)
The Economist notes:
“Data compiled by Angus Maddison, an economist who died earlier this year,
suggest that China and India were the biggest economies in the world for
almost all of the past 2000 years.”
But then asks a really silly question:
“Why they fell so far behind may be more of a mystery than why they are... 阅读全帖 |
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T**********e
发帖数: 29576 | 22 The 50 Greatest Breakthroughs Since the Wheel
http://www.theatlantic.com/magazine/archive/2013/11/innovations
1. The printing press, 1430s
The printing press was nominated by 10 of our 12 panelists, five of whom
ranked it in their top three. Dyson described its invention as the turning
point at which “knowledge began freely replicating and quickly assumed a
life of its own.”
2. Electricity, late 19th century
And then there was light—and Nos. 4, 9, 16, 24, 28, 44, 45, and most of the
rest of mode... 阅读全帖 |
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j****x
发帖数: 943 | 23 机械是不难吗。请google turbulence, shockwave, combustion, transonic flow. 到
现在还没有人能证明三维的Navier stokes 方程杰的存在性和唯一性。
哎，较真了，当我没说。 |
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j****x
发帖数: 943 | 24 机械是不难吗。请google turbulence, shockwave, combustion, transonic flow. 到
现在还没有人能证明三维的Navier stokes 方程杰的存在性和唯一性。
哎，较真了，当我没说。 |
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w*******U
发帖数: 256 | 25 aerodynamics is part of fluid mechanics. in tradition, fluid mechanics is
part of applied mathematics which involves physics (actually in the UK
applied mathematics is in some sense equivalent to theoretical physics).
Qian's supervisor von Karman was from Gottingen and Karman's supervisor was
Ludwig Prandtl who was a professor of applied mathematics and mechanics in
Gottingen. The tradition of applied mathematics in Gottingen originated from
Carl-Friedreich Gauss. In Gauss's period, mathematics ... 阅读全帖 |
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w*******U
发帖数: 256 | 26 Aerodynamics is part of fluid mechanics. In tradition, fluid mechanics is
part of applied mathematics (actually in the UK applied mathematics is in
some sense equivalent to theoretical physics). Qian's supervisor von Karman
was from Gottingen and Karman's supervisor was Ludwig Prandtl who was a
professor of applied mathematics and mechanics in Gottingen. The tradition
of applied mathematics in Gottingen originated from Carl-Friedreich Gauss.
In Gauss's period, mathematics was not divided into pu... 阅读全帖 |
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W***n
发帖数: 11530 | 27 核聚变 is NOT a chemical reaction process - combustion. There are no gaseous
byproducts. |
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T**********e
发帖数: 29576 | 28
自己家的，9-11以后难道没被fbi监控。
In late 2001, Tom Mueller was sacrificing his nights and weekends to build a
liquid-fuel rocket engine in his garage.
Mueller, a propulsion engineer at Redondo Beach, Calif.–based aerospace
firm TRW, felt like an “unwanted necessity” at his day job. His prolific
ideas about engine design were lost at such a large, diverse company. To
satisfy his creative impulses, he built his own engines, attached them to
airframes and launched them in the Mojave Desert with fellow enthus... 阅读全帖 |
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n******5
发帖数: 1990 | 29 By Quiltlover "Mrs. Clean" (Alameda, CA USA) - See all my reviews
The Western World attributes - and celebrates - the plethora of new thought,
art, science. inventions, and more wondrous feats as "originating" in Italy
's Renaissance; but - - hold it!
After reading "1434 (P.S.)," no more belief in spontaneous combustion of
intellectual, artistic, and scientific pursuits of 15th Century Italy is
possible. The author meticulously unravels this myth and shows the genesis
of the Renaissance leading ... 阅读全帖 |
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b*****d
发帖数: 61690 | 30 California lawmakers and activists are spearheading a first-in-the-nation
plan to let undocumented immigrants buy Obamacare health insurance.
Supporters say the California proposal, which would need federal approval
and couldn’t start until 2017, is the next logical step in expanding health
insurance to a population that was intentionally excluded from the
president’s health-care law. But uniting the two highly combustible issues
of Obamacare and immigration could reignite a fierce health-care r... 阅读全帖 |
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F****y
发帖数: 145 | 31 https://en.wikipedia.org/wiki/Shock_wave
Detonation wave[edit]
Main article: Detonation
A detonation wave is essentially a shock supported by a trailing exothermic
reaction. It involves a wave travelling through a highly combustible or
chemically unstable medium, such as an oxygen-methane mixture or a high
explosive. The chemical reaction of the medium occurs following the shock
wave, and the chemical energy of the reaction drives the wave forward.
A detonation wave follows slightly different ru... 阅读全帖 |
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t*d
发帖数: 8340 | 32 化学不及格吧？
[在 GoooG (pumpkin) 的大作中提到：]
：how could the insufficient combustion happen at the house where there is
no gasoline-driven generator?
：
：........... |
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x****u
发帖数: 12955 | 33
internal combustion engine could never be as efficient as electric car, even
considering the transmission, conversion and storage loss from power
generation plant to the car battery. |
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b****e
发帖数: 189 | 34 版上有木有学化工的朋友能帮我解答这个问题吗？多谢！！
process
all
combustion, |
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R********r
发帖数: 3415 | 35 1 yes
2 CO could be there from ppm to %
process
all
combustion, |
|
发帖数: 1 | 36 Cleveland Clinic
From Wikipedia, the free encyclopedia
Geography
Location 9500 Euclid Avenue, Cleveland, Ohio 44195, United States
Organization
Care system Private
Hospital type Academic
Affiliated university
Case Western Reserve University School of Medicine Cleveland Clinic Lerner
College of Medicine
Kent State University College of Podiatric Medicine
Services
Beds 1440
History
Founded 1921
Links
Website www.clevelandclinic.org
Lists Hospitals in the United States
The C... 阅读全帖 |
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C****o
发帖数: 1549 | 37 Kai Sun, Shengkai Wang, Ritobrata Sur, Xing Chao, Jay B. Jeffries, Ronald K.
Hanson, "Time-resolved in situ detection of CO in a shock tube using cavity
-enhanced absorption spectroscopy with a quantum-cascade laser near 4.6μm,"
Optics Express (2014), 22(20), 24559-24565.
Kai Sun, Shengkai Wang, Ritobrata Sur, Xing Chao, Jay B. Jeffries, Ronald K.
Hanson, "Sensitive and rapid laser diagnostic for shock tube kinetics
studies using cavity-enhanced absorption spectroscopy," Optics Express (2014
), ... 阅读全帖 |
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s*****V
发帖数: 21731 | 38 伐木工的儿子，做了4个暑假的伐木工才赚取学费，也只上了一个烂校州立。开来美国
搞军工也要考西工大。
此后在TRW工作15年，主持60吨级氢氧火箭发动机的开发。 不满工作中意见不被采纳，
自己在车库里造液体火箭。直到他被ELON MUSK发现，拜为spaceX总师，开发Merlin火
箭发动机。
Mueller was born in St. Maries, Idaho.[4] His father was a logger and wanted
Mueller to be one as well.[5] Mueller compares his story to that of Homer
Hickam, growing up in a hard-working family and going off to be an engineer
instead of following in his father's footsteps.[4] As a kid, he would build
and fly Estes model rockets. He continued to expe... 阅读全帖 |
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t******o
发帖数: 3223 | 39 尼玛，清单的34，35
SUVs with discharge capacity of 2.5L to 3L
Other vehicles equipped with an ignited reciprocating piston internal
combustion engine and a drive motor that can be charged by plugging in an
external power source. Cylinder capacity displacement exceeding 2500ml, but
not exceeding 3000ml for SUVs (4 wheel drive) |
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发帖数: 1 | 40 还硬熬什么啊
金属本身是无法做c14鉴定，但是古代制造过程不可能像现代这样有纯净的环境，所以
掺些杂质进去是不可避免的
“For the case of iron-based materials, van der Merwe and Stuiver2 first
demonstrated that it was feasible to extract the carbon from different iron-
based materials and use it to establish their age using radiocarbon dating.
A total of 15 samples of iron-based materials were dated by beta counting at
Yale University2,3 using a dependable method to extract carbon from iron
utilizing flow-through combustion in oxygen with cryogenic trappi... 阅读全帖 |
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h****l
发帖数: 7290 | 42 compressor's blades.
typically, for turbojet
if the force forward is 100%
50% on compressor
30% on combustion chamber
20% on nozzle
while 50% on turbine, but backwards.
so 50% of the forward force forms thrust. |
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Q****r
发帖数: 7340 | 43 以为就是一个combustion就行了？
里面的东西复杂着
我有Tier4发动机的requirement，你要不要拿来看一下 |
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B*V
发帖数: 3365 | 44 History of World GDP
by Barry Ritholtz - August 17th, 2010, 3:00pm
inShare
7
Email This Post
Print This Post
Via the Economist, we see this intriguing histogram of Global GDP (below)
 http://www.ritholtz.com/blog/wp-content/uploads/2010/08/GDP-History.gif" onload="adjustimg(this)">
The Economist notes:
“Data compiled by Angus Maddison, an economist who died earlier this year,
suggest that China and India were the biggest economies in the world for
almost all of the past 2000 years.”
But... 阅读全帖 |
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l****z
发帖数: 29846 | 45 人们突然意识到，电动汽车的制造过程比传统汽车要不“绿色”的多，而且如果发电来
自传统燃料，“绿色”更无从谈起
http://blogs.the-american-interest.com/wrm/2012/10/06/electric-
Electric Cars Hurt the Environment
The U.S. and other countries have spent billions subsidizing electric cars,
an environmentalist solution which has been met with only lukewarm
enthusiasm from customers. And it turns out environmentalists are split over
whether these things are in fact worse for the environment than what we’ve
got. A new research paper from the Norwegian Univer... 阅读全帖 |
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l****z
发帖数: 29846 | 46 By Patrick J. Michaels
This article appeared on National Review (Online) on May 30, 2014.
On June 2, the Environmental Protection Agency is going to announce new
rules for existing coal-fired power plants, most likely a 20 percent
reduction in allowable carbon dioxide emissions. The only way this will be
possible will be by upgrading almost all combustion units, and the ultimate
cost of the upgrades will make coal noncompetitive with much-less-expensive
natural gas–fired facilities.
The EPA’s pr... 阅读全帖 |
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l****z
发帖数: 29846 | 47 We Must Not Even Think of Accusing Leonardo DiCaprio of Hypocrisy
via Breitbart Feed
Friday’s crash of the Virgin Galactic space-plane in California was, of
course, a tragedy: One test-pilot was killed, and another seriously injured.
But there is, at least, a silver lining: There’s no need to worry about
another possible issue concerning Richard Branson’s spaceflight venture—
namely, that all those internal-combustion-powered flights would contribute
to the dread danger of climate change.
Indee... 阅读全帖 |
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j*****v
发帖数: 7717 | 48 www.nytimes.com/2015/04/03/nyregion/two-queens-women-charged-in-bomb-plot.
html
Two women living in Queens have been charged with planning to build a bomb
that they wanted to detonate in the United States.
The women, Noelle Velentzas, 28, and Asia Siddiqui, 31, who until recently
were roommates, were named in a complaint unsealed on Thursday in Federal
District Court in Brooklyn, and were expected to appear in court on Thursday
afternoon.
Ms. Velentzas and Ms. Siddiqui, who are American citizens... 阅读全帖 |
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b*****d
发帖数: 61690 | 49 【 以下文字转载自 Military 讨论区 】
发信人: brihand (brihand), 信区: Military
标 题: 加州准备立法让非法移民买obamacare
发信站: BBS 未名空间站 (Sun Jul 19 18:48:10 2015, 美东)
California lawmakers and activists are spearheading a first-in-the-nation
plan to let undocumented immigrants buy Obamacare health insurance.
Supporters say the California proposal, which would need federal approval
and couldn’t start until 2017, is the next logical step in expanding health
insurance to a population that was intentionally excluded from the
presi... 阅读全帖 |
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G**Y
发帖数: 33224 | 50 原来老爷子2013年就发推了：
https://twitter.com/realdonaldtrump/status/328912090314182657
说Apple screen size太小，应该向Samsung学。结果证明，又不小心说对了。LOL
Donald J. TrumpVerified account
@realDonaldTrump
I have a lot of @Apple stock--- and I miss Steve Jobs. Tim Cook must
immediately increase the size of the screen... http://fb.me/Hjj8Y27p
。。。
combustable lemons @leethaker 29 Apr 2013
@realDonaldTrump @apple The iPhone isn't supposed to be a damn tablet. Any
larger it won't fit in the pocket. It's perfect size right now.... 阅读全帖 |
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