w*******y
发帖数: 60932 | 1 Please proceed to final checkout for free shipping!
Audio Technica ATH-CKM50ABK In-ear Headphones are equipped with a newly
optimized direct diaphragm mount for increased fidelity and acoustic impact.
Ideal for use with all audio sources, including MP3 and other portable
players, Audio Technica ATH-CKM50ABK In-ear Headphones are supplied with
small, medium and large interchangeable earpieces for a comfortable, custom
fit.
Direct diaphragm mount for precision audio reproduction
12.5 mm rare-earth... 阅读全帖 |
|
c***y
发帖数: 412 | 2 上次sprinkler关不严
做了些research，发现diaphragm破了
买了个新的，换上后
打开开关，手动，自动都没有水
请问哪里出了问题？
valve貌似没有问题
谢谢 |
|
c***y
发帖数: 412 | 3 不是同一个牌子，仔细比了一下，基本差不多。就是diaphragm底部的小孔大小一些差
别。新换的孔稍微大一点点
可以听到丝丝声
就是没有水
btw 水源没有问题 |
|
x**8
发帖数: 4844 | 4 这个zone带几个喷头？如果只是某一个不起来，那应该是那个喷头的问题。如果好几个
没一个起来，那多半是这个控制阀到喷头的管道堵了。一个很小的可能是所有喷头都坏
了。
建议：
- 拆下来，用手或小起子刨一刨是否控制阀底部或出口管道处有小石子之类的堵赛？
更好是用shop-vac吸一下，看能不能吸出来。
- 换一个原来型号的diaphragm.
- 挖开一个喷头，拧下来，看看是不是有水压。如果有，就是所有喷头都坏了。 |
|
b****r
发帖数: 17995 | 5 挺好个镜头，一片diaphragm合不上了，也不是很贵的镜头，觉得不值得送修，决定自
己拆开看看
第一次开镜头，除了网上看过几个图片，啥经验没有，一点点拆开，自己分析结构，螺
丝分门别类放好。折腾了半天终于搞明白了，是那个叶片的两个栓子之中的一个掉了。
好在栓子还在里面，搞点502胶一粘，原样装回去，试拍几张，嘿，搞好了。虽然光学
部分也动了，100%pixel peeper了一阵子，好像看不出影响了成像质量。
美中不足是那个修过的叶片有一点点歪，光圈小于11左右开始歪得明显。反正是个F1.4
的镜头也没打算用小光圈，就懒得再打开重新粘了，算是解决问题了。不知道花掉的这
几个小时相当于赚了多少钱？ |
|
|
b***m
发帖数: 2112 | 7 恭喜破4~
应该跟gel没关系。赛前饮食、心态、比赛时没有恰当warm-up、喝水过量或过快等等可
能会有关联。
看下面文章，似乎没有明确原因。
http://www.runnersworld.com/ask-the-sports-doc/hiccups-after-ru
After longer runs (10 miles or greater) I keep coming down with the hiccups.
What the heck is going on?
Scott
Dear Scott,
Hiccups occur when the diaphragm contracts suddenly and unintentionally. The
diaphragm is your main breathing muscle and separates your lung space from
your abdominal space; as it contracts, the air is sucked into your lungs.
When running, t... 阅读全帖 |
|
s*****i
发帖数: 5548 | 8 ☆─────────────────────────────────────☆
houstonable (hou) 于 (Sat Aug 27 19:58:40 2011, 美东) 提到:
草坪sprinkler(自动浇水系统）有一个区不能停止，除非把总水闸管了。自己试着换了
solenoid和diaphragm，没有用。
求推荐 草坪sprinkler 维修。多谢了。
☆─────────────────────────────────────☆
Sytech (Sytech) 于 (Sat Aug 27 20:04:29 2011, 美东) 提到:
同求。我连solenoid在哪都没找着
☆─────────────────────────────────────☆
houstonable (hou) 于 (Sat Aug 27 20:21:09 2011, 美东) 提到:
http://www.youtube.com/watch?v=2QamLhSylec
☆─────────────────────────────────────☆
Syt... 阅读全帖 |
|
c*****u
发帖数: 331 | 9 最近，班上不上朋友纷纷换了condenser microphone也就是电容话筒。而抛弃了
dynamic话筒（动圈话筒).大家如此的乐此不疲为什么什么呢？很多人马上会说，
condenser效果好啊。那么这个好到底好在哪里。有人又说：声音清晰啊！好，下面我
就就这个为啥声音更清晰来谈一谈，希望对大家有所帮助。tidewater前几天发帖子问
为什么小的diaphragm话筒比大的反而保真度好呢，这里也一并回答了。
Diaphragms就是话筒pick up sound的核心部分，就是指由受声波波动而产生振动的元
器件。
所有的diaphragms运动都是遵循最基本的物理原理的。也就是说，越轻的diaphragms运
动需要能量越低。所以说，small diaphragms比大的响应声波能量变化的速度要快。也
就是说transient time要低。
那么大的，重的， diaphragms的特点就是可以compress sound, smooth out
transient,甚至可以blend临近的声音。这样出来的声音就会比较dark, flat.适合低频
录音。同理，小的，轻的dia |
|
c*****u
发帖数: 331 | 10 【 以下文字转载自 Music 讨论区 】
发信人: chemliu (纳米刘), 信区: Music
标 题: 由transient response谈dynamic,condenser话筒的特征
发信站: BBS 未名空间站 (Fri Aug 29 17:02:22 2008)
最近，班上不上朋友纷纷换了condenser microphone也就是电容话筒。而抛弃了
dynamic话筒（动圈话筒).大家如此的乐此不疲为什么什么呢？很多人马上会说，
condenser效果好啊。那么这个好到底好在哪里。有人又说：声音清晰啊！好，下面我
就就这个为啥声音更清晰来谈一谈，希望对大家有所帮助。tidewater前几天发帖子问
为什么小的diaphragm话筒比大的反而保真度好呢，这里也一并回答了。
Diaphragms就是话筒pick up sound的核心部分，就是指由受声波波动而产生振动的元
器件。
所有的diaphragms运动都是遵循最基本的物理原理的。也就是说，越轻的diaphragms运
动需要能量越低。所以说，small diaphragms比大的响应声波能量变化的速度要快 |
|
n******n
发帖数: 1030 | 11 我觉得你没太读清楚，再读读R21.11.1 in ACI318-08
(a)是说diaphragm是可以给非抗震构件做支撑。（a)本身并未说明diaphragm是否是
lateral resisting system的一部分。
另外，只要考虑抗震，diaphragm一定（也许99%以上）是重要的抗震系统一部分。
R21.11 — Structural diaphragms and trusses
R21.11.1 — Scope
Diaphragms as used in building construction are structural
elements (such as a floor or roof) that provide some or all of
the following functions:
(a) Support for building elements (such as walls, partitions,
and cladding) resisting horizontal forces but not
acting as part of the se... 阅读全帖 |
|
a**d
发帖数: 4285 | 12 百度来的没说到根本：
”振膜面积大，将产生很高的灵敏度和输出信号。正因如此，大振 膜电容话筒的信噪
比要高于小振膜的。“
下面的似乎比较明确了，目前的放大技术，这优势有多大呢？
Large diaphragm mics, however, do have one advantage over small diaphragm
mics that’s relevant in many recording situations: Large diaphragm mics
have a better signal-to-noise ratio. A larger diaphragm produces a stronger
signal while the amplifier noise remains the same. A louder signal above the
same noise floor means better signal-to-noise ratio. |
|
h*******r
发帖数: 146 | 13 如果是valve的问题的话，一般是不是应该先打开valve，检查diaphragm有没有坏呢？
如果是diaphragm坏了，是不是必须用和valve相同厂家和牌子的diaphragm呢？还是可
以用任何通用size的diaphragm呢？ |
|
|
wh
发帖数: 141625 | 15 【 以下文字转载自 Translation 讨论区 】
发信人: wh (wh), 信区: Translation
标 题: 哪位朋友愿意做machinery方面的翻译吗？
发信站: BBS 未名空间站 (Wed Feb 6 14:52:05 2013, 美东)
朋友需要翻译一份机械安装方面的文件（英翻中），30页左右，带去深圳培训时用。
按市场价付费。以下附一份样本为参考（不是需要翻译的文件，大致相仿）；技术细节
或不明之处会与译者解释商讨。有意者请回帖或站内信联系，非常感谢！
Sample document（非翻译文件）:
MECHANICAL SPECIFICATIONS OUTLINE
1.0 PROJECT SPECIFICS
...
1.2 This document outlines the basic requirements of the Mechanical
Installation Contractor for the installation of the equipment as proposed in
this bid package.
..... 阅读全帖 |
|
wh
发帖数: 141625 | 16 【 以下文字转载自 Translation 讨论区 】
发信人: wh (wh), 信区: Translation
标 题: 哪位朋友愿意做machinery方面的翻译吗？
发信站: BBS 未名空间站 (Wed Feb 6 14:52:05 2013, 美东)
朋友需要翻译一份机械安装方面的文件（英翻中），30页左右，带去深圳培训时用。
按市场价付费。以下附一份样本为参考（不是需要翻译的文件，大致相仿）；技术细节
或不明之处会与译者解释商讨。有意者请回帖或站内信联系，非常感谢！
Sample document（非翻译文件）:
MECHANICAL SPECIFICATIONS OUTLINE
1.0 PROJECT SPECIFICS
...
1.2 This document outlines the basic requirements of the Mechanical
Installation Contractor for the installation of the equipment as proposed in
this bid package.
..... 阅读全帖 |
|
t*******r
发帖数: 22634 | 17 【 以下文字转载自 Music 讨论区 】
发信人: tidewater (弦影), 信区: Music
标 题: [器材] small condenser 比 large 更高保真？
发信站: BBS 未名空间站 (Sun Aug 24 14:30:54 2008), 转信
器材大牛化学刘进来看一下，从 about.com 转过来的。好像是说 small
condenser 更保真，large condenser 录音更温暖的意思：
http://homerecording.about.com/od/microphones101/a/mic_types.htm
... ...
With condenser microphones, you'll generally find two different
types: small diaphragm, and large diaphragm.
Large Diaphragm Microphones - Large diaphragm microphones (LDMs)
are generally the choice for stu |
|
f**s
发帖数: 968 | 18 链接在此：
http://www.kenrockwell.com/tech/8mm-f35.htm
8mm f/3.5 Fisheye
Pro-Optic, Samyang, Rokinon, Bower &c. (2009-)
© 2010 KenRockwell.com. All rights reserved.
Intro Specs Performance Compared Recommendations
8mm f/3.5 Fisheye, Pro-Optic Nikon AI-s version. enlarge. ($290, Korean, no
filters, 13.8 oz./391g). This one came from this link to it at Adorama (also
specifically in Nikon, Canon EOS, Pentax/Samsung and Minolta Maxxum/Sony
mounts). It also comes branded as Bower, also specif... 阅读全帖 |
|
y*b
发帖数: 3190 | 19 http://www.cameraegg.org/sony-fe-90mm-f2-8g-macro-oss-lens-imag
sony-fe-90mm-f-2.8-macro-oss-lens
Here are first leaked images, specs, EU price for upcoming new Sony FE
lenses. This is first time we see the detail of Sony FE 90mm f/2.8G Macro
OSS lens.
Sony FE 90mm f/2.8G Macro OSS lens:
Price: 1.149,00
- Lens Mount: E-Mount
- Focal length: 90mm
- Maximum Aperture: f / 2.8
- APS-C distance: 135mm
- Minimum aperture: f / 22
- Filter size: 62mm
- Image stabilization: Yes
- Minimum focusing distanc... 阅读全帖 |
|
wh
发帖数: 141625 | 20 朋友需要翻译一份机械安装方面的文件（英翻中），30页左右，带去深圳培训时用。
按市场价付费。以下附一份样本为参考（不是需要翻译的文件，大致相仿）；技术细节
或不明之处会与译者解释商讨。有意者请回帖或站内信联系，非常感谢！
Sample document（非翻译文件）:
MECHANICAL SPECIFICATIONS OUTLINE
1.0 PROJECT SPECIFICS
...
1.2 This document outlines the basic requirements of the Mechanical
Installation Contractor for the installation of the equipment as proposed in
this bid package.
...
1.4 General site Information
Installation Site xxxx
P.R. China
Environment: General Purpose
Uti... 阅读全帖 |
|
t******o
发帖数: 467 | 21 来自主题: CivilEngineering版 - 地震题目一问 First you need find out diaphragm type: rigid or flexible.
For rigid diaphragm, force on the wall depends on the wall rigidity (linear
distribution).
For flexible diaphragm, force on the wall depends on the diaphragm tributary
width and will have nothing to do with wall rigidity. |
|
wh
发帖数: 141625 | 22 【 以下文字转载自 Translation 讨论区 】
发信人: wh (wh), 信区: Translation
标 题: 哪位朋友愿意做machinery方面的翻译吗？
发信站: BBS 未名空间站 (Wed Feb 6 14:52:05 2013, 美东)
朋友需要翻译一份机械安装方面的文件（英翻中），30页左右，带去深圳培训时用。
按市场价付费。以下附一份样本为参考（不是需要翻译的文件，大致相仿）；技术细节
或不明之处会与译者解释商讨。有意者请回帖或站内信联系，非常感谢！
Sample document（非翻译文件）:
MECHANICAL SPECIFICATIONS OUTLINE
1.0 PROJECT SPECIFICS
...
1.2 This document outlines the basic requirements of the Mechanical
Installation Contractor for the installation of the equipment as proposed in
this bid package.
..... 阅读全帖 |
|
t*****r
发帖数: 543 | 23 安全期
拔出
避孕环
避孕药
Global condom shortage? 5 alternative contraceptive methods to consider
Here are 5 alternative contraceptive methods to consider.
A global condom shortage might be looming after a coronavirus lockdown
forced the world’s biggest supplier to shut down production for more than a
week.
Here is everything we know about the situation.
Lockdown: decrease in condom supply
Malaysia’s Karex Bhd makes one out of every five condoms worldwide,
including for brands such as Durex, which supplies... 阅读全帖 |
|
h*********e
发帖数: 44 | 24 非常感谢你的建议。
换solenoid/diaphragm的时候，没有发现异物.安装新的solenoid/diaphragm时,没有拧
紧,VALVE漏水,于是关掉水闸，拧紧螺钉。VALVE不漏水了，可是所控制的那个区仍是总
在浇水。
我也觉得应该重新打开VALVE,把水打开flush一会儿，再次检查是否有异物。不过是在
有点胆怯了，工具不行。原配的solenoid/diaphragm也没有发现问题，第一次打开时螺
钉都拧花了，只好在HOMEDEPOT买了个新的VALUE,除了BODY都换了。 |
|
i****i
发帖数: 4803 | 25 嗯，SOS 杂志对这款麦的评价是
"An affordable large-diaphragm condenser mic that's great for vocals".
The AT2035 is one of the least expensive large-diaphragm condenser mics that
clearly provides the gently flattering quality of large-diaphragm
condensers. An impressive 148dB maximum sound-pressure level also makes it
a great choice for guitar cabinets. |
|
d**********e
发帖数: 72 | 26 SDN网上有主治医生撰长文说过：tunable diaphragm科技实际上会正确使用的医生不多
，并不很好。Welch-Allyn Harvey Elite受到高度评价
The tunable diaphragm will miss sounds at the extremes of the frequency, ie.
very low, and very high, and will not filter out unwanted frequencies.
Based on the research by Rappaport and Sprague in the '50s A tight diaphragm
is needed to detect high frequencies, and a deep bell with a sharp edge is
needed to detect low ones.
Other findings included dual lumen tubing at specific lengths of 14", 18",
or 25" (if m |
|
w*******y
发帖数: 60932 | 27 REG $179.99
Sale $74.99
USE CODE : NEWCUSTOMER10
x ($74.99) HP V-MODA | XFLPR-GUNBLACK RTL $74.99
1 x ($-10.00) DISCOUNT FOR PROMOTION CODE$-10.00
Payment Term: XXXXXXX
Extended Warranty: $0.00
Subtotal: $64.99
Tax: $4.71
Shipping and Handling: $0.00
Total Amount: $69.70
3 Days Shipping
TWO COLORS AVAILABLE
Link:
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&DEPA= lp&x=0&y=0
Type: Over the Ear
Driver Unit: 50mm Dual-Diaphragm High-Definition Driver
Frequency Response: 5Hz-30KHz
Input... 阅读全帖 |
|
w*******0
发帖数: 2949 | 28 说的是性生活，不是blowjob。你也可以去问问你太太的妇科医生。下面是在网上随便
搜到的：
Question
Please advise: is it risky to have fully penetrative sex during a woman's
period?
avid writes:
It's not risky in any way. However, it is messy and it's not everyone's cup
of tea. Also, some people strongly oppose it on religious grounds, and some
cultures have the (mistaken) belief that it can cause abnormal babies.
Nonetheless, there is no particular health danger for the man or the woman
– or for any child which is conceived. In practice,... 阅读全帖 |
|
g****g
发帖数: 1828 | 29 【 以下文字转载自 shopping 讨论区 】
发信人: gengwg (megaOr), 信区: shopping
标 题: Sennheiser HD 598 Audiophile Headphones w/ High Gloss Burl
发信站: BBS 未名空间站 (Fri Feb 11 01:29:51 2011, 美东)
Sennheiser HD 598 Audiophile Headphones w/ High Gloss Burl Wood Accents $164
.75
http://www.electronics-expo.com/m...598/1.html
Electronics Expo has the Sennheiser HD 598 Audiophile Headphones w/ High
Gloss Burl Wood Accents for $164.75 after Coupon Code: LSDA0207 (Exp 3/1). $
6.99 Shipping. Tax in NJ.
High-end open circumaural... 阅读全帖 |
|
F**********s
发帖数: 1231 | 30 framing新旧房子都是用原木，但质量有不同，比方说杉树和枞树，质量不一样。
除了framing,另外大量用到木头的是diaphragm（under wood floor or carpet）和房
子四圈（inside siding);现在普遍用刨花胶水板。
以前老房（大部分）
Framing wood质量好
diaphragm 用原木 |
|
w****a
发帖数: 6326 | 31 ☆─────────────────────────────────────☆
Huan2007 (胡绵涛) 于 (Thu Jul 26 11:22:02 2012, 美东) 提到:
发现是铜管。急人呐
☆─────────────────────────────────────☆
a9 (嗯) 于 (Thu Jul 26 11:27:15 2012, 美东) 提到:
换大扳手？哈哈
☆─────────────────────────────────────☆
Huan2007 (胡绵涛) 于 (Thu Jul 26 11:29:49 2012, 美东) 提到:
没跟铜管打过交道，是不是用了什么东西焊上去的？那还怎么拧得开？
☆─────────────────────────────────────☆
a9 (嗯) 于 (Thu Jul 26 11:31:58 2012, 美东) 提到:
没干过，但我想螺栓应该不会焊的吧？
☆─────────────────────────────────────☆
ffviii (当当当) 于 ... 阅读全帖 |
|
N****g
发帖数: 2829 | 32 解决了。我把backup preventer的钟盖打开，发现里面有个diaphragm用来控制阀门开
合的在气流来的时候不能顶到位，造成漏气。可能这是专为水流设计的，水流来的时候
能工作正常。我用手拎起来，再慢慢加气压，气压就能把它顶到位，然后水就吹出来了。
我没有把气泵接到更上游的那个水龙头，因为那个接头要用洗衣机的那种水管剪断并改
造，麻烦一点。也许接那里就不需要手拎那个diaphragm了。 |
|
x**8
发帖数: 4844 | 33 啊，俺没想到你的也是这样。俺家的PVB不是你这个型号，也是那个diaphragm需要有水
才能浮起来封闭出口。俺的做法是把里面的弹簧由diaphragm上面挪到其下面，吹完后
再换回去。没想到你的也是这样。
了。 |
|
x**8
发帖数: 4844 | 34
也是，也不是。C是第一道程序，就是在你关上屋内的阀门后，打开这个开关放空A到C
之间的余水。放的时候要把G和B也打开，就是那个螺丝拧90度和出气管平行。
B和G是compressor的接口，你需要自己做一个adaptor. 俺一般是从B送气进去。送气之
前把E和G关严实，C打开。还有最关键的是那个PVB里面的弹簧样换到diaphragm的下面
去，因为一开始送气，里面的水被吹空，diaphragm就浮不起来了，空气会从PVB呼呼的
往外跑（这可是俺免费奉送的绝技哦，俺当时网上找遍了也找不到，最后拆开PVB 研究
半天才想出这么个简单的办法，呵呵）。
吹气的时候，E关上，A打开。做完后，A、B、E、G全部半关半开，成45度角。
吹sprinkler最需要气量，压缩机太小，或管道漏气都会吹不干净。祝好运！ |
|
l****7
发帖数: 975 | 35 挺重要的：
http://www.breast-pumps.com/used_breast_pumps.htm
Used Breast-Pumps: Articles and Links
Included on this page are links and articles related to the issues of safety
involved in mothers using used single user breast pumps. Some things a
breastfeeding mother needs to consider in regards to used single user breast
pumps includes:
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Open Systems vs. Closed Systems
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Health and Hygiene Issues
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Legal and Liability Issues
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What If a Borrowed Pump Breaks?
Are Us... 阅读全帖 |
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g****g
发帖数: 1828 | 36 Sennheiser HD 598 Audiophile Headphones w/ High Gloss Burl Wood Accents $164
.75
http://www.electronics-expo.com/m...598/1.html
Electronics Expo has the Sennheiser HD 598 Audiophile Headphones w/ High
Gloss Burl Wood Accents for $164.75 after Coupon Code: LSDA0207 (Exp 3/1). $
6.99 Shipping. Tax in NJ.
High-end open circumaural headphones with E.A.R. technology for outstanding
sonic accuracy and clarity
Sennheiser's innovative Eargonomic Acoustic Refinement (E.A.R.) design
channels audio signals... 阅读全帖 |
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D******l
发帖数: 359 | 37 换solenoid/diaphragm的时候，你应该有检查水管里是否有异物吧。要不把solenoid/
diaphragm拿掉，把水打开flush一会儿试一试？不然，再拆掉一个sprinkler header,
两个出水口一起flush？ |
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a*******u
发帖数: 6324 | 38 AKG Perception 220
一英寸大振膜真电容麦
-20分贝衰减开关
低频衰减开关
心型指向
自带shockmount (AKG p/n SH-100）
奥地利维也纳设计，中国制造
价格: $128.00. free shipping
http://www.amazon.com/AKG-PERCEPTION-220-Professional-Microphon
AKG Acoustics Perception 220
Street: $179 / MSRP: $350 Cardioid Condenser Microphone
Description
AKG’s Perception 220 is the new version of the Perception 200; both are
fixed-cardioid, large-diaphragm FET condensers. The single obvious
difference between the two mics is the pad; the -10dB pad on the 200 has
... 阅读全帖 |
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a*******u
发帖数: 6324 | 39 好像是neumann U67用滴音头，然后后来大家照着仿制滴。
The K67 capsule, which since 1960 has become the most common and most copied
condenser capsule in the world, was designed to avoid the challenges and
costs of tuning the K47 so that both diaphragms produce identical frequency
responses. Unlike the K47, the K67 utilizes a two-piece backplate, allowing
the diaphragms to be tuned individually and then matched for equivalent
response.
A -10dB pad was incorporated, in response to the trend of placing
microphones closer... 阅读全帖 |
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z******o
发帖数: 1224 | 40 其实我觉得张三哥你最好是先去local店体验一下话筒，让店员介绍一下。比如B&H
photo，那家店还是很好玩的，可以玩各种声卡，相机，耳机，音响，电子乐器，等等。
就是要注意周六是不开业的，周日时间是10AM - 6PM。看中哪一款以后，网上订购也不迟
话筒按价格分很多档，同一档次的话筒各有千秋，还是要挑适合自己的。像男生就要挑
给男生的（我废话了），中低频润色多一点（靠实地听），高频不要太冒的（靠看频响
曲线）。
普遍适用的挑选方向是，振膜尽量挑LDC（large diaphragm condenser）的，既然出高
价了，就不太考虑MDC(median diaphragm)了。当然也不一概而论，可能有人就是喜欢
MDC。比如还要录个吉他什么乐器的，MDC音质更明亮点，但distortion也大。
还有就是挑一些附件比较好配的，有一些话筒，shock-mount就很难配到好的，原厂的
配套又有瑕疵，这样买了也会不爽。这一点，到了店里实地一看也解决了。
中高档的话筒：
睡鼠说的AT4050是一好麦
版上很多童鞋用的Rode NT1000, NT1-A, NTK 这三个系列都挺好，也可... 阅读全帖 |
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m****7
发帖数: 180 | 42 http://www.wikihow.com/Sing-With-Vocal-Vibrato
在这有十个步骤给整出来。
Steps
1
Soften your jaw and raise your soft palate. Hollow the inside of your mouth
while realigning the tongue on the bottom of the mouth. Hold a rounded shape
in the lips and keep the inside space of your mouth as large as possible.
Maintain a 'U' shape in the back of your throat. For many, an indication
that the soft palate is correctly raised manifests itself as excessive
yawning, for proper soft palate placement occurs naturally wh... 阅读全帖 |
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a****o
发帖数: 684 | 43 哦，我以前贴过一个关于AT2020的，
链接：
http://www.mitbbs.com/article/Music/31503415_0.html
电容麦通常会分成大振膜和小振膜，
通常认为大膜片的音质比较柔，声音温暖，灵敏度高，
而小膜片的比较硬，小膜片比较常用于乐器录音。
对于人声的录制来说，一般流行用大振膜就可以了
因为那样声音比较饱满，灵敏度比小振膜的高 特别是女声。
也会分成纯电容话筒以及背极电容话筒。（背极话筒是驻极体话筒的一种）
一个电容话筒的音头是驻极体音头还是纯电容音头，对于厂家来说是比较重要的。因为
通常在音头尺寸大小一样的条件下，驻极体音头的成本要低一些，所以通常售价会便宜
一些。
那么AT2020好像确实是小振膜驻极体话筒，所以可能在录制人声上不见得会有优势。
但是价格上应该是不错的。
“The AT2020 is an inexpensive electret condenser microphone that provides
remarkable performance for its price. ”
“Despite its side-addres... 阅读全帖 |
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r*********n
发帖数: 13992 | 44 我的85LII warranty3/30到期，到期前我把镜头寄给了canon factory service，让其
把里面的几粒灰给清理清理。昨天收到了镜头，发现service details:
Your product has been examined and it was found that there was dust caught on the internal elements. The lens USM and diaphragm was replaced and product functions were confirmed. Other inspections, cleanings and
mechanical adjustments were carried out.
然后还对USM和diaphragm提供了6个月的额外warranty。
我的镜头没送之间对焦很好啊，就是对焦环比较松；光圈叶片也没发现有什么问题，咋
都给我换了呢？ |
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y*********e
发帖数: 7269 | 45 From 无忌，9.2mm厚，52g。
Smc PENTAX-DA 40mmF2.8 XS Specification
新的K卡口超小 DA40 XS
Lens Mount: PENTAX KAF Mount
Focal Length: 40mm (Equivalent to 61mm in 35mm format) 【apsc等效61mm】
Aperture: F2.8
Minimum Aperture: F22
Lens Construction: 5 elements in 4 groups
Angle of View: 39° (with PENTAX D-SLR camera body)
Minimum Focusing Distance: 0.4m
Maximum Magnification: 0.13x
Number of Diaphragm Blades: 9 【光圈叶片强悍】
Filter Diameter: 27mm
Maximum Diameter & Minimum Length: 62.9mm x 9.2mm
Weight: 52g 【不是缩头，真是轻啊，真的... 阅读全帖 |
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t******o
发帖数: 467 | 46 来自主题: CivilEngineering版 - 地震题目一问 See this link for a sample:
http://www.ce.memphis.edu/WTNSEA/Diaphragm%20Design.pdf
If you are not in structural field, it might be a little hard for you to get
wall loading for rigid diaphragm case within a few minutes. During the
exam, putting a lot of time on one question is not a good strategy. Just
skip the question and work on other easy questions.
flexible
wall |
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d********y
发帖数: 1141 | 47 1)
Given soil site class : D
Seismic design catergory: D
Sds=0.49
W = known
T=0.04
What is V?
2) given occupancy classification
Ss=1.5
S1=1
Site classification: B
W is known
T=1
Min CBC seismic design load force=?
3) CBC requires special inspection of the 2 story includes the additional
inspection of the concrete placement of?
4) interior steel
Fv
deflection 8"
An exterior wall system
What is the drift?
5) initial structure damage is ?
7) most common failure pre1970 is what?
8) snow load
Wind l... 阅读全帖 |
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a*******r
发帖数: 344 | 48
从照片上看，3跨连续，一个unit
两头的pier 有cap beam, 并且有限制侧移
中间两个pier 没有cap, pier diaphragm 直接支撑在column 上面
中间两个pier和 diaphragm之间的连接看起来不强
脆断了 |
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g*******2
发帖数: 651 | 49 感念要清晰：
我的第一个公司做高层设计，有很多flat slab system,包含two way slab,column,没
有梁，two way slab 用SAFE计算配筋，只受gravity load;
如果你的slab是diaphragm需要参与lateral loads (seismic,wind)分配，需要额外考
虑slab shear capacity（in the lateral load direction)。我们做过一个slab on
grade,需要用它来分配lateral loads，就在板中加了额外的钢筋，传递剪力，但只限
于用于diaphragm的那个部分。 |
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z******i
发帖数: 5114 | 50 ACI 21章里说，只有不属于vertical lateral resisting system的slab才属于
diaphragm
所以我就糊涂了，two way slab本身已经有column strip是要按照moment frame来设计的
那么这个slab本身是不是同时要满足moment frame和diaphragm两个小节里面的要求呢？ |
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