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i******t
发帖数: 11048 | 2 中国的山寨那么厉害
好像这种caliper,micrometer
从来见不到中国的牌子
而且基本上90%都是mitutoyo的
10%的是美国本土的牌子 |
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M***m
发帖数: 762 | 3 老牛的MITI今天小涨一点...
Micromet Strikes Cancer Research Deal With Amgen
DOW JONES NEWSWIRES
Biopharmaceutical company Micromet Inc. (MITI) has struck a deal to partner
with Amgen Inc. (AMGN) in the research of cancer therapies in a deal worth
up to EUR695 million.
Shares of Micromet were recently up 4.2% in premarket trade. The stock is
down 29% since the start of the year.
Under the terms of the agreement, Micromet will receive EUR10 million upon
the execution of the deal. The company is eligible to ... 阅读全帖 |
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w*****3
发帖数: 2301 | 4 What is PM, and how does it get into the air?Size comparisons for PM
particles
Size comparisons for PM particles
PM stands for particulate matter (also called particle pollution): the term
for a mixture of solid particles and liquid droplets found in the air. Some
particles, such as dust, dirt, soot, or smoke, are large or dark enough to
be seen with the naked eye. Others are so small they can only be detected
using an electron microscope.
Particle pollution includes:
PM10 : inhalable particles,... 阅读全帖 |
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c**i
发帖数: 6973 | 5 Reuben F Johnson, China’s Development of Fighter Jets Relies on Russian
Systems. Washington Times, Aug 25, 2011.
http://www.washingtontimes.com/news/2011/aug/25
/chinas-development-of-fighter-jets-relies-on-russi/
Quote:
"Russian officials, quoted in Moscow news reports, said China’s military is
seeking to purchase an unspecified large number of the next-generation 117S
jet engines. The 117S engines reportedly are used in at least one of the
prototypes of the newest fighter aircraft [J-20] * * *... 阅读全帖 |
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c**i
发帖数: 6973 | 6 Jonathan Watts, WikiLeaks Reveals China's Failure to Measure Dangerous
Pollution. The Guardian, Aug 26, 2011
http://www.guardian.co.uk/environment/2011/aug/26/wikileaks-chi
(A cable dated Aug 16, 2006 from US consulate at Guangzhou noted that "small
-particulate matter known as PM2.5, was five to 10 times higher than
suggested by World Health Organisation guidelines. It said the findings were
'alarming,' because PM2.5 is not on the government index of air pollutants
yet it is deemed to be of hig... 阅读全帖 |
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g*********n
发帖数: 808 | 7 GaAs vs. Si from wikipedia
Comparison with silicon
GaAs advantages
Some electronic properties of gallium arsenide are superior to those of
silicon. It has a higher saturated electron velocity and higher electron
mobility, allowing gallium arsenide transistors to function at frequencies
in excess of 250 GHz. Unlike silicon junctions, GaAs devices are relatively
insensitive to heat owing to their wider bandgap. Also, GaAs devices tend to
have less noise than silicon devices, especially at high fre... 阅读全帖 |
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c******7
发帖数: 1177 | 8 我可以理解为，对于旋光介质各处折射率都不同，光因此不断反射叠加? 反射主要还是
发生在真空和样品的前表面。
我测量的是n-GaAs, 激发光波长是817.5nm，低温试验。active layer是1 micrometer,
substrate是500 micrometer. 在这种情况下，光都被吸收了，所以我认为后表面没有
反射。 |
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d*b
发帖数: 21830 | 9 你老公对高能实验太不了解了，高能实验本地的clock精度至少要1 nano second，粒子束的bunch大小远小于1 micrometer, 要有你老公说的那误差，collider实验都不用做了。要知道，collision发生需要1 micrometer的精度。
知道1 nano second里光走多远？ 30 厘米！ |
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m********y
发帖数: 21909 | 10 他说大家等着结果吧，看看最后结论是什么，貌似信心满满。他用了另一个例子，说宇
宙的退速度也比光速快--
大厦，是不是下半年平板电脑全面代替笔记本？
子束的bunch大小远小于1 micrometer, 要有你老公说的那误差，collider实验都不用
做了。要知道，collision发生需要1 micrometer的精度。 |
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s**********8
发帖数: 25265 | 11 Optical coherence tomography (OCT) is an optical signal acquisition and
processing method. It captures micrometer-resolution, three-dimensional
images from within optical scattering media (e.g., biological tissue).
Optical coherence tomography is an interferometric technique, typically
employing near-infrared light. The use of relatively long wavelength light
allows it to penetrate into the scattering medium. Confocal microscopy,
another similar technique, typically penetrates less deeply into t... 阅读全帖 |
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f**d
发帖数: 768 | 12 这是一本计算神经科学的优秀著作，全文拷贝这里（图和公式缺），有兴趣的同学可以
阅读
如需要，我可以分享PDF文件（－－仅供个人学习，无商业用途）
From Computer to Brain
William W. Lytton
From Computer to Brain
Foundations of Computational Neuroscience
Springer
William W. Lytton, M.D.
Associate Professor, State University of New York, Downstato, Brooklyn, NY
Visiting Associate Professor, University of Wisconsin, Madison
Visiting Associate Professor, Polytechnic University, Brooklyn, NY
Staff Neurologist., Kings County Hospital, Brooklyn, NY
In From Computer to Brain: ... 阅读全帖 |
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m*********n
发帖数: 91 | 13 【 以下文字转载自 Military 讨论区 】
发信人: maggieklean (maggie klean), 信区: Military
标 题: 柳叶刀数据:2010年中国污染造成一百二十万例早死
发信站: BBS 未名空间站 (Mon Apr 1 20:45:01 2013, 美东)
http://www.nytimes.com/2013/04/02/world/asia/air-pollution-link
Air Pollution Linked to 1.2 Million Premature Deaths in China
BEIJING — Outdoor air pollution contributed to 1.2 million premature
deaths in China in 2010, nearly 40 percent of the global total, according to
a new summary of data from a scientific study on leading causes of death
worldw... 阅读全帖 |
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C********n
发帖数: 6682 | 14 这个是PM测定，
fine particulate matter (PM2.5), are 2.5 micrometers or less in diameter,
about a tenth the fraction of human hair.
细微粉尘,估计沙尘暴时候拍的吧
撒哈拉也有沙尘暴 |
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p*****c
发帖数: 20445 | 15 Science评价还是不错的，专门写了News：
Science 5 November 2010:
Vol. 330. no. 6005, p. 747
DOI: 10.1126/science.330.6005.747
News of the Week
Neuroscience:
China's Brain Mappers Zoom In on Neural Connections
Kristen Minogue
Anyone in business, and even just fans of The Apprentice, knows that
connections matter. Neuroscientists understand that, too, which is why a
research team in China has gone to great lengths to create the most detailed
three-dimensional map yet of all the connections between the neurons in... 阅读全帖 |
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D**S
发帖数: 24887 | 16 If necessary, they can even make 5cm sound like 50000 (micrometer). |
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w*********r
发帖数: 42116 | 17 PM2.5 particles are air pollutants with a diameter of 2.5 micrometers or
less. 包括固体颗粒和液体颗粒。和雾霾没有关系，雾霾是衡量可见度的。如果都是液
体是雾，有固体颗粒了，就是霾.
PM2.5突然高于平均情况，要看颗粒的成分，才能知道污染如何加重的。如果没有新的
污染源，PM2.5增大，只能说明更小的颗粒达到了被测量到的SIZE。
可能是heterogeneous nucleation，固体颗粒表面反应，吸附了水分或者其它液态气态
物质变成大颗粒，重颗粒。也可能homogeneous nucleation，液态或气态同一种物质，
因为浓度的提高或者温度的变化，稳定成核的SIZE变大，原来更小的颗粒变成大于2.5
的颗粒。 |
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m*********n
发帖数: 91 | 18 http://www.nytimes.com/2013/04/02/world/asia/air-pollution-link
Air Pollution Linked to 1.2 Million Premature Deaths in China
BEIJING — Outdoor air pollution contributed to 1.2 million premature
deaths in China in 2010, nearly 40 percent of the global total, according to
a new summary of data from a scientific study on leading causes of death
worldwide.
Figured another way, the researchers said, China’s toll from pollution was
the loss of 25 million healthy years of life from the population.
The... 阅读全帖 |
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r**s
发帖数: 129 | 19 Let's be fair here. I have a gorgeous, adorable Taiwanese girlfriend that I
am willing to spend the rest of my life with. Not because she is Hello Kitty
, submissive, shallow, brain dead and a good fuck. Because she calls herself
a freak (a surprisingly foxy one) , standing out from that essentially
numbed crowd that I call most of Taiwan (excluding the "hen qi guay" lot),
in ways that make most other girls look like total idiots.
就這方面而言，我想講幾句實在話：我有一個台灣女朋友，看起來漂亮又大氣。我很願
意跟她共度下半輩子。我之所以如此，不是因為她對丈夫言... 阅读全帖 |
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t**x
发帖数: 20965 | 20 The Mitutoyo Case: Will Japan Learn from Its Mistakes or Repeat Them?
Introduction
In the last few years, a number of Japanese companies have been implicated
in export control violations that have highlighted deficiencies in Tokyo's
ability to control the spread of sensitive dual-use technologies. One of the
most prominent and egregious cases is that of the Mitutoyo Corporation, a
leading precision measuring device manufacturer. The charges in this case
revolved around the illegal transfer of fi... 阅读全帖 |
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M*V
发帖数: 3205 | 21 http://www.nytimes.com/2013/04/02/world/asia/air-pollution-link
Air Pollution Linked to 1.2 Million Premature Deaths in China
BEIJING — Outdoor air pollution contributed to 1.2 million premature
deaths in China in 2010, nearly 40 percent of the global total, according to
a new summary of data from a scientific study on leading causes of death
worldwide.
Figured another way, the researchers said, China’s toll from pollution was
the loss of 25 million healthy years of life from the population.
The... 阅读全帖 |
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g*****9
发帖数: 4125 | 22 measure its thickness with a micrometer.
change if below safety spec. |
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l******a
发帖数: 10467 | 23 rotor一般侧面会有最小厚度， 用micrometer测量， 就是千分尺， 大概每60度角选点
测量
刹车片那个人肯定是在胡说， 你把轮子打到45度角， 脑袋深过去就看到了， 一毫米
你早完蛋了， 换个铺子吧， 换pads＋rotor总成本好的大概150， 不好的可以到60，
车铺子不可能给你用好的 |
|
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a*******a
发帖数: 4212 | 25 it's called caliper. Fright Harbor has deal this week. |
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s*******n
发帖数: 2828 | 26 scotty kilmer just bought an engine stand .. |
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I*D
发帖数: 40035 | 27 这个工具都个人来说真的没啥用处。就连我在dealer做工的时候都很少用， 要求顾客
换rotor的是后基本靠目测。比如锈蚀太厉害，划痕太深，厚度明显过薄。就建议顾客
换新rotor。你个人的话总不会闲着没事把轮子写下来去量rotor的厚度吧？ |
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n****1
发帖数: 2895 | 28 一个rotor也就30来块，感觉不对就换了。还买卡尺？ |
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d****2
发帖数: 6250 | 29 说实话rotor如果不是明显弯了啥的从来不用换的。 |
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l******a
发帖数: 10467 | 30 check local harbor freight tools, I bought mine from them, pretty cheap |
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v*****z
发帖数: 3067 | 32 right ....
lz have nothing to do. |
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m**u
发帖数: 632 | 33 我开快的时候左前有嗡嗡的噪音, 不知道是不是ROTOR的问题, 因为我转动轮子的时候
能听到BRAKE和ROTOR在某个地方有摩擦, 但是很轻, 也许不是噪音的原因, 但是既然有
摩擦说明ROTOR已经有问题了吧? |
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d*b
发帖数: 21830 | 34 别搞笑了，哪个authorized dealer查rotor不拆轮子的？不要说修车，所有的
inspection都拆轮子用dial indicator测rotor的，拆个轮子很难吗？ |
|
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d*b
发帖数: 21830 | 36 sears， 10刀，不过是英制的，你要买好的，比如Mitutoyo，300刀 |
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d*b
发帖数: 21830 | 37 rotor的寿命是10年/100k左右，如果你买的是100k左右的旧车，那么开1-2年后很可能
就轮到你换rotor |
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d*b
发帖数: 21830 | 38 测量仪器，需要过NIST（和它的代理）的检验，你明白的 |
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m**u
发帖数: 632 | 39 请问WHEEL BEARING是什么, 这个需要大拆吧, 那就找SEARS做了, |
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s****i
发帖数: 5469 | 40 然后用一个不过3分钟的视频来教大家换引擎。他买的那个好便宜，不知道质量怎
么样。 |
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b****n
发帖数: 3343 | 41 5mm sounds on the low end. What car do you have? Look up the vehicle on
Autozone.com and then click on the specifications page. You will need a
micrometer to measure the rotor.
brake pad usage really depends on the road condition and your driving style
though it doesn't have much to do with time period. I've heard people have
the them changed at 20k ~ 60k mile interval. |
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d*b
发帖数: 21830 | 42 这里狗屁不懂的人太多了，这版真没法看了
你的车的各缸压缩冲程的气压是多少？小于90psi就要换valve,大于120psi基本正常。
accord的valve不会因为你没加机油就坏的，valve 坏都是timing不对造成的，如果
timing没问题，查lifter上的shimmer厚度就可以了。而且看车行给你开的单子，labor
才500刀就给你换valve？吃饱撑的啊？换valve的技术难度比换clutch高多了，那玩意
基本是micrometer的精度。 |
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g********d
发帖数: 19244 | 43 ☆─────────────────────────────────────☆
neeagle (海东青) 于 (Fri Mar 15 01:18:50 2013, 美东) 提到:
晚上好。我的车是03accord，4缸。最近半年发动机空转的时候总是有tick声。然后一
个铺子的师傅说可能需要调一下valve。
我就找了一个报价略低的，然后那哥们检查后打电话跟我说打开盖子发现camshaft和下
面的阀门有磨损，问我是不是之前机油没换。事实上的确有一次机油灯亮了。这哥们说
valve调整和这个问题比都是小事了。
请问这种情况下我需要换整个camshaft和阀门吗？还是这是正常情况？
☆─────────────────────────────────────☆
neeagle (海东青) 于 (Fri Mar 15 01:24:29 2013, 美东) 提到:
忘了说了。mileage 现在是137xxx，比较高。2年前买的，那时是125000左右。
☆─────────────────────────────────────☆
neeagle (海东青) 于... 阅读全帖 |
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p*******e
发帖数: 186 | 44 美国修车铺的mechanic很多都是社区学院培养出来的，能力有多强不好下结论。我没有
在任何一家修车铺看过检测尺寸公差的设备，比如量circular runout, total runout
，cylindricity的工具，估计manual micrometer都不知道如何读数。况且现在的车都
有很复杂的电路，读取信号对他们更是可望不可及。买车这种事只能是个人运气＋车的
口碑。 |
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v*******n
发帖数: 8995 | 45 首先排放超标的，
也就是电脑作弊的是Nox，这个东西号称link to lung cancer
但所谓的研究就是看看住在路边的人得lung cancer的比列是不是更高，样本量一版
10000左右，
这不废话么。
马路上的废气剁了去了，烟大灰大，还吵，你能赖光赖NoX
最近的一个比较负责的研究，统计乐大约30万人得出的结论是
With full adjustment for all measured confounders, the pooled results from
the cohorts showed that each increase in concentration of PM10 (each 10
micrometers/m3 increase) led to a corresponding increase in lung cancer risk
(hazard ratio 1.22, 95% confidence interval [CI] 1.03 to 1.45).
注意啊。。。。
However, for the other types of pollutan... 阅读全帖 |
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l**********1
发帖数: 5204 | 46 >6 first author Top journal of that field papers,
one example, Julia R GREER
before 2008 Jan 1st her publications record:
2007
Greer, J.R., George, S., and Herbert, E.
Effective Use of Focused Ion Beam in Investigating Fundamental Mechanical
Properties of Metals at the Sub-Micron Scale
Proc. Mat. Res. Soc., 893E, 1, 2007
Greer, J.R. and Street, R. A.
Mechanical Characterization of Solution-Derived Nanoparticle Silver Ink Thin
Films
J. Appl. Phys., 101 (10), 103529 (2007)
Nix, W.D., Greer, J... 阅读全帖 |
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q********n
发帖数: 98 | 47 A smart, reliable, high efficient, hard work girl with good ability to learn
and to solve problems.
本科是华中科技大学的机械设计制造及其自动化，研究生是Worcester Polytechnic
Institute, Manufacturing Engineering. Experience with processes like
Machining, Casting, Molding, Forging, Welding, Coating, familiar
with materials like Steel, Aluminum, Copper, Alloy, Plastics, well trained
on methods like GD&T, FEA, Six-Sigma, Design for Manufacturability, PPAP,
CAPA, basic knowledge on industry standards like ISO, ANSI, ASTM, MIL... 阅读全帖 |
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q********n
发帖数: 98 | 48 A smart, reliable, high efficient, hard work girl with good ability to learn
and to solve problems. 本科是华中科技大学的机械设计制造及其自动化，研究生是
Worcester Polytechnic Institute, Manufacturing Engineering. 去年毕的业，现居
美东波士顿大区，free to relocate. 寻求未来可能提供H1B的工作机会。联系方式是
[email protected]
(function(){try{var s,a,i,j,r,c,l,b=document.getElementsByTagName("script");l=b[b.length-1].previousSibling;a=l.getAttribute('data-cfemail');if(a){s='';r=parseInt(a.substr(0,2),16);for(j=2;a.length-j;j+=2){c=parseInt(a.substr(j,2),16)^r;... 阅读全帖 |
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g*****j
发帖数: 1211 | 49 It will never get deep into your lung. Only particles on the micrometer
range can get into lung. For carpet fiber, it will be blocked by hairs in
your nostrils.
Ahhhhhhh-Chiiiii |
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