z*****z
发帖数: 2438 | 1 一个零件，所谓的中心有个孔，孔定位在一个芯轴上，4个sensor（接触、非接触都可
）测量一下距离，如图所示。这4个sensor用master校过，然后计算出零件相对master
的偏心（实际中心孔与理想中心孔的距离），不需要角度。
有没有已经成熟的模块可以实现这个功能的，比如，自带4个sensor和amplifier, 输入
控制限到amplifier, amplifer自动判断，输出1/0信号。
希望相对简单些，实在不想用4个sensor接工控再编程。
材料：铸铁
尺寸：dia 50mm
要求精度; 0.01mm
测量周期：不大于10s |
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e****0
发帖数: 678 | 2 Screening
Pap smear for vervical cancer is 21 yo
DM
24-28 weeks
One hour 50 grams oral glucose tolerance test. BG > 140
Three hours glucose tolerance test (if two or more are positive)
1. Fasting BG > 95
2. One hour BG > 180
3. Two hours BG> 155
4. Three hours BG > 140
• Dysfunctional uterine bleeding (DUB)
Heavy vaginal bleeding occurs in the absence of structural or
organic disease
Endometrial biop... 阅读全帖 |
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m******i
发帖数: 834 | 3 美国政府机构的科学家制造出了一种新型的激光纳米晶材料。具体报道如下：
The scientists said their nanocrystal is a "soft" optical material that can
be processed in solution, offering flexibility for laser design, with a
potential use in lab-on-a-chip technologies and quantum information
processing devices.
Semiconductor nanocrystals have excellent light-emitting properties, making
them good candidates for use in laser applications. But achieving the
crucial condition for lasing -- optical amplification -- has proved
problematic. No |
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l******u
发帖数: 2314 | 4 【原文请参见《纳米豆腐的世界》】
【http://nanotofu.blogspot.com/2007/12/exploration-of-swnt-cloning-continues.html】
Amplification of Single-Walled Carbon Nanotubes from Designed Seeds:
Separation of Nucleation and Growth
Douglas Ogrin, Robin E. Anderson, Ramon Colorado, Jr., Benji Maruyama, Mark
J. Pender, Valerie C. Moore, Sean T. Pheasant, Laura McJilton, Howard K.
Schmidt, Robert H. Hauge, W. Edward Billups, James M. Tour, Richard E.
Smalley, and Andrew R. Barron
J. Phys. Chem. C, 2007, 111 (48), 17804-17806 |
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D****p
发帖数: 13 | 5 把30万刀的amplifer送给我吧，我现在自己搭，头都炸了。。。。。。 |
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c********6
发帖数: 658 | 6 谢谢回答！！
请教各位同学帮忙修改一下这段从google直接翻译过来的，这是我以前修过的一门选修
课程。
激光原理与技术
课程简介
激光原理与技术是光学、光电子、光通信类专业的基础课，也是物理类其它专业的选修
课。激光原理主要讲授激光的特性、光与物质相互作用的基本知识，激光的形成、其增
益、频率和功率（能量）等激光器工作特性，光学谐振腔理论，高斯光束的形成及传输
、变换特性。激光技术内容主要是讲授对激光的控制和改善，重点是调Q、锁模，光放
大。
the course title: Principles and techniques of laser
Principles and technology of laser optics, optoelectronics, optical
communications specialty basic course, but also other professional physics
electives. Laser Principles laser characteristics of the main lecture, the
basi... 阅读全帖 |
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c*******9
发帖数: 34 | 7 我的方向是超短脉冲的放大，chirped-pulse amplification.我很喜欢自己的这个方向
，因为这个方向需要涉及到很多光学领域的知识。如果你有兴趣我们可以探讨
我觉得阿秒挺有意思的，不过这个领域已经不是激光技术领域的，而是使用超短脉冲的
激光作为工具，进行物理层面的研究
另外，光纤激光器肯定是未来的一个大方向，无论是连续 还是超短脉冲，我觉得很有
前景。个人见解，敬请指正！
你是什么方向的，那个实验室的？我有个师弟也做石墨烯的锁模激光，说不定能认识。
。 |
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S*********k
发帖数: 507 | 8 From today's NY Times:
Tingye Li （厉鼎毅）, Instrumental in the Laser’s Development, Dies at 81
Tingye Li, an electrical engineer whose calculations in the early 1960s
helped guide the development of the laser and propel the dizzying increase
in the speed of fiber-optic communication, died on Dec. 27 in Snowbird, Utah
. He was 81.
Family photo
Some of the work done by Dr. Tingye Li and his colleagues at Bell Labs laid
the groundwork for today’s broadband.
The cause was a heart attack while he was on... 阅读全帖 |
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w*******y
发帖数: 60932 | 9 Give your iPhone GPS, podcasts, and phone calls a sound boost. The built-in
amplification system in the cradle doubles the volume from your iPhone
speaker making it easier to hear your voice-guided directions, calls and
more. It mounts on any dash with no installation required. The cradle holds
your iPhone safely and securely on even the roughest terrain yet uses no
adhesive or hardware so it can be repositioned for optimum GPS reception and
moved easily from car to car.
* Doubles the volum... 阅读全帖 |
|
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w*******y
发帖数: 60932 | 11 Amazon.com Has this JBL Balboa SUB 10 - 10-Inch Powered Subwoofer $99.99
with free shipping.
Link Link:
http://www.amazon.com/JBL-Balboa-SUB-10-Subwoofer/dp/tech-data/
Product Features and Technical Details
10" Woofer,100-Watt Amplifier
LFE input,Slim Footprint
Black cabinet
Technical Details
Brand Name: JBL
Model: BALBOA SUB10
Speaker Type: Subwoofer
Speaker Amplification Type: Active
Speakers Maximum Output Power: 225 Watts
Speakers Response Bandwidth: 50 - 150 Hz
Speaker Connectivity: Wired
H... 阅读全帖 |
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w*******y
发帖数: 60932 | 12 Vann's has the KEF 3-way black ash Q series center-channel loudspeaker IQ60C
Black Ash for $249.88 today only. Free shipping and no tax for most.
Link:
http://www.vanns.com/shop/servlet/item/features/548586020/kef-i
Comparison Specifications
Power rating: 15 - 150W
Input impedance: 8 ohms
Tweeter: One 0.75" aluminum tweeter in Uni-Q array with midrange driver
Midrange: One 5.25" driver in Uni-Q array with high-frequency tweeter
Woofer: Two 5.25" low-frequency drivers
Cabi... 阅读全帖 |
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w*******y
发帖数: 60932 | 14 Giveaway of the Day: Sound Editor Pro
DESCRIPTION
Sound Editor Pro lets you make and edit music, voice and other audio
recordings. When editing audio files you can cut, copy and paste parts of
recordings and, if required, add effects like echo, amplification and noise
reduction. Sound Editor Pro works as a wav editor or mp3 editor, but it also
supports a number of other file formats including vox, gsm, au, aif, ogg,
wmv and more.
FEATURES
Sound editing functions include cut, copy, paste, delete,... 阅读全帖 |
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w*******y
发帖数: 60932 | 15 This is Pioneer's upper echelon premium receiver and an EXCELLENT buy for
this price! Don't wait...go go go!
Apply Coupon Code = AFL4COUPON
Pioneer Elite VSX-31 110W 7.1 Channel A/V Receiver with 110 Watts, Black:80W
x 7 Direct Energy Amplification
Dolby TrueHD, Dolby Digital Plus, Dolby ProLogic IIz, DTS-HD Master Audio/
High Resolution Audio
WMA 9 Pro Decoder
DTS Neural Surround
Advanced Surround Sound (13 plus 1 modes)
HDMI with 3D support
3D noise reduction
iPod and iPhone Certified
Ethernet... 阅读全帖 |
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w*******y
发帖数: 60932 | 16 I was searching for pricing on some receivers and found this Pioneer Elite
VSX-31 on Walmart for $298.98. I had no idea that Walmart carried the Elite
line but then again, this is the only model i could find on their site. I
searched the webs but did find anything cheaper from a reliable known source
that had it brand new. I thought this was a pretty good price so here you
go
Walmart Pioneer Elite VSX-31 $298.98:
http://www.walmart.com/catalog/product.do?product_id=16874074&f
Details:
Elite rece... 阅读全帖 |
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w*******y
发帖数: 60932 | 17 Amazon Marketplace has Harman Kardon Soundsticks III:
http://www.amazon.com/Harman-Kardon-Soundsticks-III/dp/B0042F3K
fulfilled by Amazon for $116.23.
Next lowest price from a reputable seller is $135. These sell new for $169
@ most places.
Listen to a work of art.
Praised for its stunning design, the harman kardonSoundSticks II speakers
and subwoofer system became a milestone in harman kardon history when it
became part of the permanent collection at New York City's Museum of Modern
Art (MoM... 阅读全帖 |
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w*******y
发帖数: 60932 | 18 Polk Audio Monitor Series PSW10 10-Inch Powered Subwoofer (Single, Cherry)
Product Features and Technical Details
Size: 10 Inch | Color: Cherry
Product Features
Single 10-inch subwoofer in cherry with built-in high-current amplifier for
big bass
Equipped with one 10-inch polymer-composite dynamic-balance cone driver
Laser-based Klippel measurement technology for improved linearity and deep,
precise sound
Non-resonant all-MDF enclosure construction with 0.75-inch-thick baffles and
internal bracin... 阅读全帖 |
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w*******y
发帖数: 60932 | 19 Costo.com:
http://www.costco.com/Browse/Product.aspx?prodid=11711268&whse=
Has a Pioneer 7.1 Channel Elite A/V Receiver (3D Ready)
$299.99
Shipping and Handling Included
You may need to buy a membership for an additional $40 if you don't already
have one.
(May also be able to pick this up at a B&M so YMMV in that case.)
Next cheapeast price I could find was $349.99 buy searching through google
and looking on Amazon.com.
Audio Features:80 Watts x 7 Direct Energy Amplification
Digital Core Engine ... 阅读全帖 |
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w*******y
发帖数: 60932 | 20 Altec Lansing IMT520 In-Motion iPod/iPhone Speaker Dock, Black $49.88+1.97
Shipping or Free ship to store
Altec Lansing IMT520 In-Motion Speaker:
2 x 3" full-range drives for immersive sound
Class D amplification for rich, controlled audio
Compatible with select iPod and iPhone devices
Charges while you listen to power your device
Automatically pauses music when calls come in on your iPhone
Rechargeable battery delivers up to 6.5 hours of power
Convertible handle provides easy portability
Auxili... 阅读全帖 |
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w*******y
发帖数: 60932 | 21 Previous FP deal is back!
A complete 5.1-channel systemTo experience the full impact of today's most
exciting movies at home, you need a full 5.1-channel speaker system - four
surround-sound satellite speakers, a dedicated center-channel speaker and an
omnidirectional powered subwoofer. The Cinema 300 speaker package has
everything you'll need, including the cables and speaker wire you'll need to
set it all up.
Dual midrange center speaker. The center channel is perhaps the hardest-
working spea... 阅读全帖 |
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f*****x
发帖数: 675 | 22 BP Disaster: What Investors Need to Know
The whole nation is watching the unfolding disaster in the Gulf in disbelief
. It's hardly a surprise that BP stock plunged again Tuesday. But panicking
never helped anybody, investors included. With so much of the coverage now
gripped by hysteria, it's time to look at some cold facts.
Here are the numbers that investors need to know.
First, what cost is Wall Street putting on the disaster?
Despite the total focus on BP, four other companies were closel... 阅读全帖 |
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x*****u
发帖数: 3419 | 23 【 以下文字转载自 Translation 讨论区 】
发信人: xiaozhu (此君), 信区: Translation
标 题: A Very Short History of Bad Writing z
发信站: BBS 未名空间站 (Sun Aug 14 15:01:00 2011, 美东)
A Very Short History of Bad Writing
===================================
Now, anyone familiar with the history of English prose might wonder
whether anything we do here will substantially improve its future. Since
the earliest times, many writers have graced us with much good writing.
But others have afflicted us with much that is b... 阅读全帖 |
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p*********e
发帖数: 32207 | 24 才看了一下bmwusa,x3上premium sound:
"
Premium sound with DSP (Digital Sound Processor)
AM/FM stereo/CD/MP3 audio system with 8 upgraded speakers,
upgraded amplification, vehicle-speed sensitive equalization,
and auxiliary audio input adapter compatible with portable
music players; pre-wired for 6-disc CD changer8 and satellite radio
"
似乎就是音箱跟功放升级了.
, |
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