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全部话题 - 话题: propulsion
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W***n
发帖数: 11530
1
来自主题: JobHunting版 - Propulsion Engineer
Propulsion Engineer - Pittsburgh, PA
Minimum Required Skills: BS/MS Engineering/Aerospace or related, Space
mission experience, Spacecraft propulsion systems, MMH and MON-23 propulsion
system, Fluid dynamics for propulsion systems, Thermal analysis for
propulsion systems, Solidworks, ANSYS If you are a Propulsion Engineer with
experience, please read on! What You Will Be Doing -Design and development
of lunar lander propulsion system -Design and evaluate performance of ACS,
feed system component... 阅读全帖
W***n
发帖数: 11530
2
来自主题: JobHunting版 - Propulsion Engineer
Propulsion Engineer
General Atomics • Huntsville, AL
Posted 15 days ago
General Atomics (GA), and its affiliated companies, is one of the world’s
leading resources for high-technology systems development ranging from the
nuclear fuel cycle to remotely piloted aircraft, airborne sensors, and
advanced electric, electronic, wireless and laser technologies.
We recognize and appreciate the value and contributions of individuals with
diverse backgrounds and experiences and welcome all qualified ... 阅读全帖
W***n
发帖数: 11530
3
来自主题: JobHunting版 - Propulsion Engineer at Ventions, LLC
Propulsion Engineer at Ventions, LLC
San Francisco, CA 94103
Report this job
About the Job
Aerospace R&D Company seeks mechanical / aerospace engineer to be
responsible for the development of new liquid propulsion components and
systems to support current and future R&D programs.
The Company is looking for dynamic, self-starting individuals who thrive in
an entrepreneurial environment, and have the potential to become significant
contributors to the overall direction and success of the projects.... 阅读全帖
W***n
发帖数: 11530
4
来自主题: JobHunting版 - Propulsion Engineer
key is:
Fluid dynamics for propulsion systems - Thermal analysis
for propulsion systems
r********o
发帖数: 1423
5
I am in aerospace propulsion system. Spacecraft propulsion is tough to get
in, in the meanwhile, the funding for this area is shorter and shorter.
w*******y
发帖数: 60932
6
I know there is already a thread for the Under Armour summer clearance, but
I thought this item deserved its own thread. UA Propulsion Shoe for $21.99.
Sizes 9-11 available.
Shipping is free over $125 otherwise I believe it's $5.
Use code "retailme" to get free shipping over $75
[URL="http://http://www.underarmour.com/shop/us/en/pcid1209952-Men-s-UA-Propulsion-Trainer-Shoe[/URL]
W***n
发帖数: 11530
7

Plasma propulsion sounds interesting...
i*********5
发帖数: 19210
8
The Flutter Kick, One of Swimming's Mysteries, July 1995
http://www.swimmingworldmagazine.com/articles/swimmagazine/arti

by Marty Hull
The Flutter Kick
One of Swimming's Mysteries
Legs are very powerful on land, able to move us around with quickness and
grace. In the water, legs do not always work very well. This article
explores how the flutter kick works, why some swimmers have very effective
kicks and others do not, and how to make your kick better through specific
stretching and strength... 阅读全帖
i*********5
发帖数: 19210
9
【 以下文字转载自 Swimming 讨论区 】
发信人: ironman2015 (IMMT 2013), 信区: Swimming
标 题: The Flutter Kick, One of Swimming's Mysteries, July 1995
发信站: BBS 未名空间站 (Mon Sep 16 16:22:58 2013, 美东)
The Flutter Kick, One of Swimming's Mysteries, July 1995
http://www.swimmingworldmagazine.com/articles/swimmagazine/arti

by Marty Hull
The Flutter Kick
One of Swimming's Mysteries
Legs are very powerful on land, able to move us around with quickness and
grace. In the water, legs do not always work very well. This arti... 阅读全帖
i*********5
发帖数: 19210
10
How Champions Do It
http://coachsci.sdsu.edu/swim/champion/evans.htm
JANET EVAN'S FULL STROKE AT 625 m OF HER 800 m GOLD MEDAL SWIM AT THE
BARCELONA OLYMPIC GAMES 1992
Each frame is .1 second apart. The swimmer breathes at the end of each right
arm pull.
Notable Features
Frame #1: This picture illustrates a feature of most top crawl-stroke
swimmers. The right arm entry is made at full stretch (no underwater gliding
) and is accommodated by a very linear posture in the total swimmer. The
uppe... 阅读全帖
T**********e
发帖数: 29576
11
来自主题: Military版 - 空客版的一级火箭回收方案
看着和波音的设计类似,只不过一级发动机自己用机翼飞回跑到降落,不像波音一样半
空中用直升机抓降落伞。但最后估计只剩20-30%发射成本。SpaceX的一级整体回收可以
发展成登火星返回的手段,空客的回收纯粹是节约成本。
Herve Gilibert, technical director for Airbus’ Space Systems division, said
the Adeline propulsion unit — engine and avionics — is where lies most of
the value of the first stage. The Airbus team concluded that SpaceX’s
design of returning the full stage to Earth could be simplified by
separating the propulsion bay from the rest of the stage, protecting the
motor on reentry and, using th... 阅读全帖
T*****n
发帖数: 274
12
来自主题: Military2版 - 6000吨法军最新型护卫舰海试
你确定有CODLOG这种说法?23型肯定是CODLAG,gas turbine和柴油发电机
高速下是并车的。
参看一个文档 (出自converteam公司,他们为type 23提供DC electric motors
and DC propulsion converters):
“A hybrid electrical/mechanical propulsion was designed. This employed
a low power DC propulsion motor, supplied via the ship’s diesel generators
, for slow speed quiet operations. This was complemented by gas turbines,
drivingthrough a reduction gearbox, for higher speed operations. This
system is known as CODLAG or Combined Diesel Electric and Gas Turbines... 阅读全帖

发帖数: 1
13
VTOL项目总师Kevin Renshaw; F35垂直起降技术(3BSD)来源于通用的Model 200,与
雅克141无关
F-35B Lightning II Three-Bearing Swivel Nozzle
By Kevin Renshaw Posted 12 August 2014
The Convair Model 200 was proposed in June 1972 to respond to the US Navy
request for designs for a fighter/attack aircraft for the sea control ships.
The VTOL aircraft would have used a PW401 engine with an afterburning 3BSD
plus twin Allison XJ99 lift engines located behind the cockpit for added
vertical lift forward of the center of gravity to b... 阅读全帖
D***0
发帖数: 5214
14
Chevy的官网上是说汽油机是做REx的啊。而且这个REx engine在volt上有84hp, i3那
个则小很多,只有35hp。Also
http://www.greencarreports.com/news/1094005_2014-bmw-i3-rex-vs-
Different philosophies
Although both Volt and i3 are classified as range-extended electric cars,
Chevy and BMW engineers came to their drafting boards with very different
marching orders from management.
The Volt has an EPA all-electric range of 38 miles, enough to cover about 80
percent of typical daily commutes, according to GM. The 84-hp range-
extender engin... 阅读全帖
m****1
发帖数: 736
15
来自主题: Faculty版 - new NAE members 2015
http://www.nae.edu/Projects/MediaRoom/20095/130169/130172.aspx
New Members
Atwater Jr., Harry A., Howard Hughes Professor of Applied Physics and
Materials Science, California Institute of Technology, Pasadena. For
contributions to plasmonics.
Balakrishnan, Hari, professor of computer science, Massachusetts Institute
of Technology, Cambridge. For contributions to wired and wireless networks
and distributed systems.
Bardasz, Ewa A., president, ZUAL Associates Consulting, Mentor, Ohio. For
novel au... 阅读全帖
s******0
发帖数: 78
16
来自主题: SanFrancisco版 - 求圣诞弯区附近驾车游建议~~

发信人: berg2007 (berg), 信区: SanFrancisco
标 题: 台胞着的,写的不错,谁有兴趣组织一一遍历? (转载)
发信站: BBS 未名空间站 (Sun Oct 31 14:19:31 2010, 美东)
11. San Francisco
San Francisco旧金山最早由西班牙人建立,快速成长于十九世纪中的淘金热中,二十
世纪初的大地震曾经对这个城市造成毁灭性的打击,后来又迅速复甦,是美国西岸最有
文化历史,被誉为世界最美丽城市之一。Skyline城市地平线是举世闻名景色。旧金山
也是被认为是最有欧洲风味的美国城市,彷彿与外界隔绝般,在山与海的环抱下,金门
大桥与环美金字塔耸立着,叮当车行驶在丘陵起伏的地面,维多利亚式房屋和中国城形
成最主要特征。
矗立在海湾的橘色Golden Gate Bridge金门大桥,背景一面是完全的山,而另一面是高
耸的城市,那样完美镶合一起,当从城市内丘陵起伏的地形,往海边俯冲而下时,忍不
住让人赞叹不已。这样一个美丽的城市,拥有独特地标建筑,半岛地形三面环海,海外
又有山,是美国最适合无车自助旅行的几个城市之一。不... 阅读全帖
h****1
发帖数: 1242
17
来自主题: Military版 - NASA tests Saturn V engine parts
http://www.space.com/19379-saturn-5-f1-engines-test-firing.html
http://www.youtube.com/watch?v=1AD-DbC3e68&feature=player_embed
NASA is reigniting its mighty moon rocket engine using parts retrieved from
museums and displays.
Engineers working this month at the Marshall Space Flight Center in
Huntsville, Ala., are completing a series of test firings using recovered
components from 40-year-old F-1 engines. The 19-foot-tall (5.8 meter) by 12-
foot-wide (3.8 meter) Apollo powerhouses launched the s... 阅读全帖
a******o
发帖数: 16625
18
China’s Shoddy, Noisy Nuclear Submarines
Over the past two decades, the People’s Republic of China has made great
advances in its military capabilities. However, it still lags woefully
behind in developing nuclear-powered submarines. The problem for the Chinese
is that they lack the necessary quieting and propulsion technologies to
build anything remotely comparable to an American or Russian nuclear
submarine.
Even the newest Chinese Jin-class ballistic nuclear missile submarines and
improved Sh... 阅读全帖
l****z
发帖数: 29846
19
The first private spacecraft aiming to dock with the international space
station blasted off from Florida and reached orbit early Tuesday with split-
second precision, but the biggest tests for the mission are still days ahead.
The predawn skies around Cape Canaveral filled with the bright glow and deep
rumble of Space Exploration Technologies Corp.'s Falcon 9 rocket lifting
off the pad, carrying an unmanned Dragon spacecraft on a highly anticipated
test flight scheduled to last about two weeks.... 阅读全帖
l****z
发帖数: 29846
20
Peter Lee
Lee, a physicist born in China who worked at the Los Alamos National
Laboratory and later for TRW Inc., pleaded guilty to lying on security-
clearance forms and passing classified national-defense information to
Chinese scientists on business trips to Beijing.[29] He compromised
classified weapons information, microwave submarine-detection technology and
other national-defense data,[4] and the Department of Energy later
concluded that his disclosure of classified information "was of si... 阅读全帖
y**********u
发帖数: 6366
21
来自主题: Running版 - 推荐一个Blog:Science of Running
谢谢啊
这个没看懂。。。
After the initial loading phase, propulsion starts to occur and the foot
begins to come off the ground. The center of pressure should move towards
with the big toe acting as a locking mechanism before the foot leaves the
ground. This locking insures that the foot acts as one entire unit, allowing
for greater propulsion. Unlike what many suggest, do not try and get any
extra propulsion out of pushing off with the toes.
这个locking mechanism before the foot leaves the ground是啥?
i*********5
发帖数: 19210
22
来自主题: Swimming版 - 孙杨动作分析
结合高阳教我的来解读孙杨的动作分析:
“把肘顶起来”,在孙杨的这段动作分析里,我的理解就是:
Frame #1: The upper left arm abducts to provide the power for the pull.
Frame #2: Abduction of the upper left arm continues with the hand-forearm
surface providing most of the propulsive force.
Frame #8: The right arm begins to sink and bend at the elbow.
Frame #9. The right arm is very likely to be propulsive at this stage.
Frame #15: The left arm begins to be repositioned for propulsion. The wrist
begins to bend at the same time the elbow flexes a... 阅读全帖
s****e
发帖数: 914
23
我的猜测:判断时机的原则 ------ 臂推水产生的propulsion应该和腿打水的
propulsion sync起来。这样可以让两个波峰重叠,maximize propulsion。
如果这个原则是对的,那么腿的动作应该更patient一点,稍微滞后于臂。臂完成evf准
备,开始向后推水的同时,再打水。
b***u
发帖数: 12010
24
来自主题: TVGame版 - Aperture Science
http://half-life.wikia.com/wiki/Aperture_Science
Aperture Science, Inc.,[7] often simply referred to as Aperture Science or
simply Aperture, is an American scientific research corporation whose
laboratories and administration, Aperture Laboratories, are located in
Cleveland, Ohio, USA.[1] Originally a shower curtain manufacturer, it
evolved over the course of half a century into an experimental physics
research institution and a bitter rival of Black Mesa.
"Aperture Laboratories" is also used as... 阅读全帖
l***g
发帖数: 1035
25
www.acpropulsion.com/openings.html
SENIOR MECHANICAL DESIGN ENGINEER - Ref Job# 202
We are seeking an experienced Mechanical Design Engineer to work in the
vehicle engineering department. This team is responsible for developing
prototype vehicles to test, develop and integrate our products and
technology including electric propulsion motors, power electronics (
inverters, chargers, DC-DC converters) battery modules, battery monitoring
systems and powertrain systems as well as vehicle accessory d... 阅读全帖
z*******n
发帖数: 1034
26
来自主题: MobileDevelopment版 - Utilities for C/C++ Android Developers: fplutil 1.0
http://google.github.io/fplutil/
10 NOVEMBER 2014
Utilities for C/C++ Android Developers: fplutil 1.0
By Stewart Miles, Fun Propulsion Labs at Google*
Today we're announcing the 1.0 release of fplutil, a set of small libraries
and tools by Fun Propulsion Labs at Google (the FPL in fplutil) that is
useful when developing C/C++ applications for Android.
fplutil introduces the following:
build_all_android.py, an all-in-one build script that allows you to build (
with the Android NDK), install and r... 阅读全帖
y***k
发帖数: 9459
27
【 以下文字转载自 Military 讨论区 】
发信人: yesok (ok博士), 信区: Military
标 题: 上一代人类已经掌握了反重力和星际航行的能力
发信站: BBS 未名空间站 (Wed Mar 30 23:44:53 2016, 美东)
反引力手册摘录
By D. Hatcher Childress
Many researchers into the UFO enigma tend to overlook a very important fact.
While it assumed that most
flying saucers are of alien, or perhaps Governmental Military origin,
another possible origin of UFOs is ancient
India and Atlantis.
许多研究员进入不明飞行物谜之内容易看出一个很重要的事实。虽然多数被假定是外星
人的飞碟,或也许
是政府的军事来源,不明飞行物的另外一个可能的来源是古印度和亚特兰提斯岛。
What we know ab... 阅读全帖
c**i
发帖数: 6973
28
来自主题: Military版 - Diesel Engine and Gas Turbine
Nick Schulz, Engines of Commerce; The unheralded machine power that moves
manufactured goods and raw materials around the world. Wall Street Journal,
Dec. 1, 2010 (title in the print).
http://online.wsj.com/article/SB10001424052748704584804575645034285007578.html
(book review on Vaclav Smil, Prime Movers of Globalization. MIT Press, 2010)
Note:
(a) Rudolph Diesel (1958-1913) obtained in 1892 a patent for an engine he
designed.
(b) Frank Whittle (1907-1996; father of jet propulsion) took out a pa... 阅读全帖
n*******4
发帖数: 2285
29
http://www.galcit.caltech.edu/history/index.html
Hsue-shen Tsien (PhD 1939; student of von Kármán) Assistant Professor of
Aeronautics, 1943–1946; Robert H. Goddard Professor, 1949–1955. Director
of the Guggenheim Jet Propulsion Center, 1949–1955. Scientist who was von K
ármán's protégé, colleague, and heir-apparent. Became the first Director
of the Daniel and Florence Guggenheim Jet Propulsion Center established at
Caltech in 1949.
c**i
发帖数: 6973
30
来自主题: Military版 - 潛射雄二
Harpoon is A/R/UGM-84.
AGM stands for air-to-ground missile; RGM Radar Guided Missile; UGM
Underwater Guided Missile.
(1) Harpoon Block II; Backgrounder. Boeing, undated.
http://www.boeing.com/defense-space
/missiles/harpoon/docs/HarpoonBlockIIBackgrounder.pdf
Quote:
"Weight:
1,160 lb. Air configuration
1,459 lb. ASROC configuration
1,520 lb. TARTAR configuration
1,523 lb. Capsule/canister configuration
"Propulsion: Air-breathing turbojet engine (cruise), solid-propellant
booster
Note:
(a) RUR-5... 阅读全帖
c**i
发帖数: 6973
31
来自主题: Military版 - Chinese Are Not 'Ten Feet Tall': Mullen
Paul Dibb, Knocking on Nobody's Door. The Australian, July 18, 2011 (
available now).
http://www.theaustralian.com.au/national-affairs
/commentary/knocking-on-nobodys-door/story-e6frgd0x-1226096366875
("Let's look at how long it has taken China to develop what are, in fact,
rather modest military capabilities")
Quote:
"Unlike the US and Russia, it has no credible nuclear war-fighting
capability. China's land-based intercontinental ballistic missile force was
until quite recently vulnerable to a ... 阅读全帖
c**i
发帖数: 6973
32
VOA Chinese, Aug 12, 2011
http://www.voanews.com/chinese/news
/20110812-China-Russia-ends-visit-127582938.html
Note: 马林剧院 Mariinsky Theatre
http://en.wikipedia.org/wiki/Mariinsky_Theatre
(section 1 Name)
--------------------------------Separately
(1) 中国首艘航母不叫瓦良格号. VOA Chinese, Aug 12, 2011
http://www.voanews.com/chinese/news
/20110812-Aircraft-carrier-naming-127586618.html
("8月10日,中国首艘航母进行出海航行试验。官方新华社在报道中只用了“航母平台”
加以称呼。中央电视台的报道说,根据海军惯例,军舰在正式服役以后才会有真正的命
名")
Quote:
(a) "正式服役" in humans and milita... 阅读全帖
w**j
发帖数: 1032
33

e = ½ mv2
It is reported that at the 2008 Joint Propulsion Conference, where future
space propulsion challenges were discussed and debated, a conclusion was
reached that it was improbable that humans would ever explore beyond the
Solar System.[1] Brice N. Cassenti, an associate professor with the
Department of Engineering and Science at Rensselaer Polytechnic Institute,
stated “At least 100 times the total energy output of the entire world
would be required for the voyage (to Alpha Centaur... 阅读全帖
c**i
发帖数: 6973
34
I am a biologist by training. But it appears you are as ignorant about
rockets as I.
(1) Tiangong 1 weighs merely 8.5 metric tons (hereafter tonnes). Besides
Tiangong 1 on Sept 29, 2011 Long March 2F also launched Shenzhou 5 (in 2003)
, 6 and 7, all into low Earth orbit (LEO), which is defined as "from the
Earth’s surface up to an altitude of 2,000 km."
http://en.wikipedia.org/wiki/Low_Earth_orbit
In comparison:
Geostationary transfer orbit
http://en.wikipedia.org/wiki/Geostationary_transfer_orb... 阅读全帖
m********6
发帖数: 1283
35
http://www.asianage.com/india/agni-v-indias-china-killer-306
Agni-V, India's 'China Killer'
India on Thursday successfully launched its long-range Agni-V ballistic
missile.
Here are some salient features of the missile and the test, which propelled
the country into a special league of nations:
* Agni-V is a 5,000-km intermediate range ballistic missile (IRBM)
* Short of an inter-continental ballistic missile (ICBM) by 500 km
* 17.5 metres long, can carry 1- to 1.5-tonne conventional and nuclear ... 阅读全帖
p******u
发帖数: 14642
36
http://www.eri-aurora-borealis.eu/en/news_and_media/image_galle
http://www.eri-aurora-borealis.eu/en/aurora_borealis/technical_
Vessel type: Heavy Icebreaker with highest IACS Ice Class: Polar Class 1
Start of construction: 2012 (planned)
Commissioning: 2014 (planned)
Operational lifetime: 35 – 40 years
Estimated construction costs: 650 Mill. (December 2008)
Estimated operational costs: 36 Mill. p.a. (December 2008)
Length over all: 199.85 m
Length between perpendiculars: 174.27 m
... 阅读全帖
z********n
发帖数: 1729
37
【 以下文字转载自 Headline 讨论区 】
发信人: zongheimun (feifei), 信区: Headline
标 题: Next Friday, a 130,000 ton asteroid is set to pass perilously close
to earth.
发信站: BBS 未名空间站 (Sat Feb 9 14:03:20 2013, 美东)
National Aeronautics and Space Administration experts who plotted its
trajectory are confident that the primordial rock, weighing an estimated 130
,000 metric tons, will pass within "a remarkably close distance" of Earth,
nearer than many orbiting communications satellites but far enough away to
safely sp... 阅读全帖
T**********e
发帖数: 29576
38
来自主题: Military版 - SpaceX第一个火箭发射四次才成功

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
T**********e
发帖数: 29576
39
ULA的新Vulcan火箭要只回收一级发动机,燃料罐就扔了,发动机分离后打开一个防热
罩,然后降落伞减速,直升飞机半空中捕捉。
A sample illustration of mid-air recovery of main engine section.
ULA chief explains reusability and innovation of new rocket
CAPE CANAVERAL — United Launch Alliance will salvage the main engines
through a mid-air recovery plan and reuse them again aboard the company’s
new Vulcan rocket, saving 90 percent in booster propulsion costs, the
company announced Monday.
It is dubbed SMART Reuse, or Sensible Modular Autonomous Return Techno... 阅读全帖
v*******e
发帖数: 11604
40
太空科技要靠AI,大家看我的答记者问。
标 题: 看我老15年11月18日答记者问,有关AI,我老真太牛了
发信站: BBS 未名空间站 (Sat Mar 12 20:57:31 2016, 美东)
直接从我的回答里面拿出来的,给大家看看。一个字不改哈。本来是关于宇航的,记者
问我答的。看我老领先你们至少几个月吧。
Q3: "It seems clear that the only chance for long interplanetary manned
missions outside our Solar System (or even within) would be to develop
radically new propulsion systems. What are your thoughts on this? "
A3: I believe that before we see even a slim chance of manned interstellar
space travel, we will see artificial general intellige... 阅读全帖
v*******e
发帖数: 11604
41
直接从我的回答里面拿出来的,给大家看看。一个字不改哈。本来是关于宇航的,记者
问我答的。看我老领先你们至少几个月吧。
Q3: "It seems clear that the only chance for long interplanetary manned
missions outside our Solar System (or even within) would be to develop
radically new propulsion systems. What are your thoughts on this? "
A3: I believe that before we see even a slim chance of manned interstellar
space travel, we will see artificial general intelligence (AGI, https://en.
wikipedia.org/wiki/Artificial_general_intelligence ) to change *everything*
on ... 阅读全帖
y***k
发帖数: 9459
42
反引力手册摘录
By D. Hatcher Childress
Many researchers into the UFO enigma tend to overlook a very important fact.
While it assumed that most
flying saucers are of alien, or perhaps Governmental Military origin,
another possible origin of UFOs is ancient
India and Atlantis.
许多研究员进入不明飞行物谜之内容易看出一个很重要的事实。虽然多数被假定是外星
人的飞碟,或也许
是政府的军事来源,不明飞行物的另外一个可能的来源是古印度和亚特兰提斯岛。
What we know about ancient Indian flying vehicles comes from ancient Indian
sources; written texts that
have come down to us through the centuries... 阅读全帖
k*******l
发帖数: 698
43
美帝的出口限制就是一份明确的中国需要攻克技术路线图
高景1卫星发射成功后,美国立即放松同类卫星的出口控制,后天生效
送交者: 古宇庙 2017年01月13日14:37:21 于 [世界军事论坛] 发送悄悄话
Federal government tweaks space export control rules
by Jeff Foust — January 12, 2017
Harris SpaceViewThe change in aperture limits will move some larger imaging
systems off of the U.S. Munitions List, and therefore will no longer be
subject to ITAR. Credit: Harris
WASHINGTON — The federal government is taking more space-related items off
of the most restrictive export control list, although s... 阅读全帖
b*******k
发帖数: 1761
44
cGregor, Texas – October 21, 2009 – Space Exploration Technologies (SpaceX
) successfully conducted two static firings of the first stage, nine engine
cluster for its Falcon 9 launch vehicle. The firings took place at SpaceX's
Texas Test Site, a 300-acre structural and propulsion testing facility just
outside of Waco, Texas. With completion of these tests, the first stage has
now passed both structural and propulsion acceptance testing and will ship
to Cape Canaveral in preparation for the first
h****1
发帖数: 1242
45
来自主题: Military2版 - Russian mission to Mars fails
http://physicsworld.com/cws/article/news/47750
Russia's first interplanetary mission in over 15 years has failed after
launch due to an engine mishap that prevented the unmanned spacecraft from
being sent on its proper course toward Mars. The craft – dubbed Phobos-
Grunt – is now trapped in orbit around Earth with engineers having around
three days to save the craft before its batteries run out.
Phobos-Grunt, costing $163m, is a Russian Space Agency mission that was
designed to travel to Mars' m... 阅读全帖
c****g
发帖数: 37081
46
台湾著名网友YST眼中的钱学森:太震撼了!!
钱学森一直是我很有兴趣的一位人物,因为世上有很多杰出的科学家,但是我不记得有
任何一位科学家能像钱学森一样在政治上这么轰动,能像钱学森一样对一个主要国家产
生如此深远的影响。由于中国是一个崛起的大国,飞弹又是军事科技与太空科技领域中
最重要的技术,钱学森对中国军事现代化的贡献是震动全世界的。
钱学森是中国近代科学界的传奇人物。从父母的特殊家教,中学开明教育下的成长,优
良的大学教育,出国学习与世界顶尖高手过招,战争时期的杰出科学成就,回国探亲,
再回美国就职,陷入政治漩涡几乎丧命,周恩来总理的援救,离开美国返回祖国,从无
到有建立中国的导弹工业与航天工业,九十五岁高龄至今仍然精神清醒和意志坚定..
..,多么传奇的一生!
钱学森随便一段生涯故事都可以拍一部引人入胜的电影,它曲折的程度、牵涉的科技面
、引发的新工业与军事革命、产生的政治和经济影响,每一样都远远超过「美丽心灵」
(A Beautiful Mind)的主角约翰.纳许(John Nash)。如果做一个比较,钱学森在
美国的研究工作直接导致美国航空与太空工业的世界领先,钱学森为中国建... 阅读全帖
m********6
发帖数: 1283
47
http://www.asianage.com/india/agni-v-indias-china-killer-306
Agni-V, India's 'China Killer'
India on Thursday successfully launched its long-range Agni-V ballistic
missile.
Here are some salient features of the missile and the test, which propelled
the country into a special league of nations:
* Agni-V is a 5,000-km intermediate range ballistic missile (IRBM)
* Short of an inter-continental ballistic missile (ICBM) by 500 km
* 17.5 metres long, can carry 1- to 1.5-tonne conventional and nuclear ... 阅读全帖
z********a
发帖数: 3
48
来自主题: RisingChina版 - 国际主流媒体对钱学森的评价
3. 西方报纸
1. 英文报纸:
a. 纽约时报长文报道钱老去世的消息
http://www.nytimes.com/2009/11/04/world/asia/04qian.html
第一句定位他为杰出的火箭专家"a brilliant rocket scientist"。后面同时认可他对
美国早期火箭技术发展的重要贡献: "...played a central role in early United
States’ efforts to exploit jet and rocket propulsion."
全文讲了钱在美国及回国后作出的成绩,以及和美国当局的一些过节,没有提到任何他
和气功及大跃进。
b. 洛杉矶时报长文报道
http://www.latimes.com/news/nationworld/nation/la-me-qian-xuesen1-2009nov01,0,2865408.story
标题和第一句都重点强调他在caltech协助创建的Jet Propulsion实验室。全文大部分
笔墨都在讲他回国的前因后果,只有最后三句提及他回国后的经历:一句说文革中未
B*V
发帖数: 3365
49
【 以下文字转载自 Headline 讨论区 】
发信人: zongheimun (feifei), 信区: Headline
标 题: Next Friday, a 130,000 ton asteroid is set to pass perilously close
to earth.
发信站: BBS 未名空间站 (Sat Feb 9 14:03:20 2013, 美东)
National Aeronautics and Space Administration experts who plotted its
trajectory are confident that the primordial rock, weighing an estimated 130
,000 metric tons, will pass within "a remarkably close distance" of Earth,
nearer than many orbiting communications satellites but far enough away to
safely spee... 阅读全帖
l*******g
发帖数: 27064
50
继续高潮
尼玛自己下来文件数数看
例如2012款 sequoia,有如下10 个问题投诉条目,去掉重复条目和自动加速,正好剩
下5个
950301 ENGINE
950302 FUEL/PROPULSION SYSTEM
950303 POWER TRAIN
999086 SERVICE BRAKES
1012200 SERVICE BRAKES
1012201 VEHICLE SPEED CONTROL
1012202 ELECTRONIC STABILITY CONTROL
1022119 ENGINE
1022120 FUEL/PROPULSION SYSTEM
1022121 ELECTRONIC STABILITY CONTROL
刚翻文件,搜索sequoia,还看到个巨搞笑的投诉,尼玛sequoia车主把sequoia的
轮胎标配生产商给投诉了,说是才4个月,4kmile的车子轮胎磨损不均匀,这尼玛明显
是车子alignment问题吧,结果怪到轮胎上了,丰田车主真奇葩
可惜看完翻过去了,没留快照,也忘了当时用的啥关键词了
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