T******T
发帖数: 3066 | 1 now let us speculate on the mechanics behind the antenna issue, I think it
is less of a hardware issue, but more of a system co-existence and software
issue and totally resolvable by an firmware update.
By touching the ends of those two separate antenna path on the frame, plp
are saying it essentially creates a low impedance path between the 2. (not a
complete short). But why the drastic attenuation in cell-band signal
strength ?
I suspect it is due to the BT/WIFI periodically transmitting at |
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n****r
发帖数: 5801 | 2 【 以下文字转载自 LeisureTime 讨论区 】
发信人: wh (wh), 信区: LeisureTime
标 题: Times评选世界50 galleries
发信站: BBS 未名空间站 (Thu May 16 11:34:12 2013, 美东)
看看你们去过几个？
排名第三的彼得堡的state hermitage museum，拍过电影russian ark，就记得金碧辉
煌，没看到什么画……
排第15的Yale Center for British Art我也常觉得比英国的画廊都好……小而精致，
各个时期和画家的代表作收集得很精，介绍也很精，看完印象很深。建筑也很宽敞明亮
，令人愉快，不过太亮是不是对画不好。
有个Doha的Museum of Islamic Art。希望有机会去。
台北故宫上榜，北京故宫没上，倒是北京的789工厂榜上有名。说最近有一个Duchamp
and/or/in China的展览，到六月中截止。听着挺有趣，不知道goldy去看过没。
第50名是波士顿的museum of bad art，听着很好玩，有人去过吗？
Times另外还评选了世界50... 阅读全帖 |
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M****7
发帖数: 13407 | 3 【 以下文字转载自 Connecticut 讨论区 】
发信人: wh (wh), 信区: Connecticut
标 题: Times评选世界50 galleries, Yale Center for British Art排名十五
发信站: BBS 未名空间站 (Thu May 16 11:15:57 2013, 美东)
排名见下。你们去过几个？我也一直很喜欢Yale Center for British Art，宽敞明亮
，袖珍而精。喜欢Constable，Turner的画作，很有代表性。
台北故宫上榜，北京故宫没上，倒是北京的789工厂榜上有名。
第50名是波士顿的museum of bad art，听着很好玩，有人去过吗？
The Times
The world’s 50 greatest galleries
May 4 2013
1 Uffizi Gallery, Florence
The word masterpiece can be bandied about too easily in Italy but the Uffizi
is packed with them... 阅读全帖 |
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W*********l
发帖数: 624 | 4 ft 这不是矛盾不矛盾的问题，搞数理化跟日后做领导有联系吗？too attenuated 顶多
算曲线救国
亚裔孩子要注意培养leadership，不要关在屋子里搞数理化，没前途。美国孩子有几个
搞数理化的？那些活都是留给中印外来打工的，就像城里的体力活都是给打工仔的
当然孩子要真是数理化天才那另说。不过这个比例实际很小。
记住，改变亚裔的nerd形象，从你们的孩子做起；不然这样一代一代混下去，到头来还
比不过jackie chan这样给老黑老子儿子提鞋的呢 |
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w*****t
发帖数: 243 | 6 it has been working for past 3 years until now. What changed recently?
If I buy one from Comcast approved list models, that would not be prone to
this signal attenuation? |
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C*********g
发帖数: 3728 | 7 SA was turned off long ago.
His problem is that vegetation canopy attenuates signal strength.
With a GPS in forest park is not a ultimately safe way at all. |
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r*******n
发帖数: 310 | 8 I have two kids in MCPS elementary school now: one in 1st grade which has
this curriculum Math2.0, the other one in 5th grade magnet center that is
not. I do not realize any math extension program in place (maybe I do not
pay too much attenuation to the school stuffs). I knew there are different
groups formed in class for math and English during the conference with his
teacher.
I signed the petition because of 主任 even though I do not against the math2
.0 so far. Here is my two cents:
1. Your kid... 阅读全帖 |
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h******2
发帖数: 1498 | 9 the path from the signal source to the ear is subject to a lot of things --
different components, circuit boards, transmission impedance, attenuation,
etc. so the signal level perceived by human ears are not always the same
between the left and right channels (or among the 6 or 8 channels in a
surround system).
that's why most receivers are supplied with a "balance" knob to compensate
for the differences between the left and right channels.
these differences might be hard to hear, but they can |
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a*****e
发帖数: 4577 | 10 这个考虑了光再水中的attenuation吗
walleye对这种颜色更敏感。 |
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o*******p
发帖数: 722 | 11 I did lots of homework and finally bought this one:
Howard Leight R-03318 L3 Shooter's Premium Earmuff
High attenuation rating NRR 30 |
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f********r
发帖数: 3155 | 12 嗯，scar那个muzzle brake很强大，如果你在枪的侧面，32DB的耳罩都无法attenuate
它的刺耳尖叫。。。
m4 v6那个omega 12 quad rail确实很好，加工精致且轻，单独买也要几百刀的样子。
现在被我打扮成圣诞树，quad rail四面都装上东西了: mbus+镜子, red dot, bipod
adapter,asap，其实就玩个新鲜，很快就没意思了。还是只装铁喵的枪最纯粹，玩起来
最有意思 |
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T******g
发帖数: 21328 | 13 ComTac II：passive attenuation of 20dB，那么低，其他有什么吸引人的地方？电子
部分好？ |
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b******o
发帖数: 5644 | 14 Howard Leight R-01526: Automatically blocks noise above 82 dB, noise
reduction rating: NRR 22
Howard Leight R-03318: High attenuation rating NRR 30
Howard Leight 1030110: Noise reduction rating of 25 provides protection from
most low and medium levels of hazardous noise
Peltor H10A Optime 105: CSA approved; 29 dB hearing reduction
我有1和4，1的隔音效果和4差很多。一般电子的都没有哑巴隔音好。 |
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S**********s
发帖数: 4534 | 15 Ultrasound is conducted in liquid, as air tend to attenuate and reflect high
frequency sound too much. Its more thorough as long as you can also clean
out the water. |
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h*********n
发帖数: 11319 | 16 It makes every sense to double up. A pair of 3M earplugs is definitely not e
nough for indoor rifle range. That's from my own ear-ringing experience thou
gh.
Ear plus usually provide better noise reduction overall, but they lack at
high
frequency attenuation. Ear muffs work better against the higher frequency
por
tion of the blast.
And electronic ear muffs can actually amplify the environment sound, making
it easier to talk to your shooting buddies than wearing ear plugs alone. |
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g*2
发帖数: 658 | 17 Overview of running injuries of the lower extremity
Author
Lisa R Callahan, MD Section Editor
Karl B Fields, MD Deputy Editor
Jonathan Grayzel, MD, FAAEM
All topics are updated as new evidence becomes available and our peer review
process is complete.
Literature review current through: Feb 2012. | This topic last updated: Oct
20, 2011.
INTRODUCTION — Running is one of the world’s most popular forms of
exercise, with millions of regular participants. In the United States alone,
up to 40 mil... 阅读全帖 |
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L********9
发帖数: 85 | 18 The higher the friction of the surface of the court, the more the spin is
increased when it impacts with the court, and the increase in angular
momentum comes at the expense of linear momentum so the ball bounces at a
more vertical angle than it would on a court with less friction.
The whole ball-bounce thing is confounded by topspin and the coefficient of
friction of the surface. With heavy topspin on high-friction surfaces, the
horizontal velocity of the ball is attenuated greatly after the ba... 阅读全帖 |
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f*****g
发帖数: 15860 | 19 http://www.bloomberg.com/news/2012-02-01/rajat-gupta-jc-flowers
Full Tilt Units, Executives Win Civil RICO Suit Dismissal
Units of Full Tilt Poker and 10 executives won dismissal of civil claims
filed under the federal Racketeer Influenced and Corrupt Organizations Act.
The lawsuit was filed in June by Full Tilt poker players seeking to recoup,
as a group, about $150 million they claim they lost when the Ireland-based
Internet poker site and others like it were shut by U.S. Attorney Preet
Bharar... 阅读全帖 |
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L********g
发帖数: 4204 | 20 yes you need to increase the attunuation. so the scocerer need to increase
endu, attunu, and intel. I have a int of 20 and attenu of 16( gives 4 slots,
if you equip the darkmoon covenant ring, you will have additional one slot) |
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wh
发帖数: 141625 | 21 看看你们去过几个？
排名第三的彼得堡的state hermitage museum，拍过电影russian ark，就记得金碧辉
煌，没看到什么画……
排第15的Yale Center for British Art我也常觉得比英国的画廊都好……小而精致，
各个时期和画家的代表作收集得很精，介绍也很精，看完印象很深。建筑也很宽敞明亮
，令人愉快，不过太亮是不是对画不好。
有个Doha的Museum of Islamic Art。希望有机会去。
台北故宫上榜，北京故宫没上，倒是北京的789工厂榜上有名。说最近有一个Duchamp
and/or/in China的展览，到六月中截止。听着挺有趣，不知道goldy去看过没。
第50名是波士顿的museum of bad art，听着很好玩，有人去过吗？
Times另外还评选了世界50 museums，我没Times帐号，看不到全文（这篇50 galleries
是其他报纸转载的），谁有帐号的能不能分享一下？谢谢！
The Times
The world’s 50 greatest galleries
May 4 2013
1 Uffizi G... 阅读全帖 |
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i***a
发帖数: 11826 | 22 嗯，scattering和propogation/interaction media（这里是空气）的attenuation
coefficiency有关，和光的能量也有关（波长短能量高散射少）。。。。为什么和光的
波长有关呢？比如散射monte carlo simulation的时候，貌似不需要考虑波长。。。是
人眼视觉细胞对颜色的敏感度吗。。。愿闻其详。。。 |
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a*******u
发帖数: 6324 | 23 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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a*******u
发帖数: 6324 | 24 说明书上有。
5. Input 1-2 Instrument / Line level switches - switch either input between
instrument and line level signals
你要是有吉他的话，要选择instrument，也就是高阻（Hi-Z）了好象是。
要不就是线性输入。这里好像是讲阻抗匹配啥的。
6. Input 1-2 Level Pad switches - each switch attenuates the corresponding
input by 10dB when engaged。
这个是上面yikeli说的衰减，不过是10分贝。 |
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a*******l
发帖数: 2353 | 25 家里箱子正常音量有点吵，若调低音量，drive不够，听起来“举而不坚”。
一个hot plate要３００－４００，贵，不值得。
我想不就是一个 power amp和speaker之间的电阻器么，不会多难吧。 想自己作一个。
有没有人作过类似的东西？
我的箱子 (Mesa Boogie Roadster combo)功率不大，１００瓦 |
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a*t
发帖数: 2596 | 28 haha
能开大声的时候没钱买箱子,有钱买箱子了又不能开大声了. |
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p***c
发帖数: 5202 | 30 不要用普通电阻，最好接个电炉丝，冬天采暖问题也解决了 |
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h**********l
发帖数: 148 | 32 记得在它back panel有一个switch,可以选50还是100瓦。不过50也很loud,我都放在地
下室瞎搞。 |
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f****g
发帖数: 379 | 34 需要attenuator的话我告诉你怎么做。只要10块钱。
特别是这种几瓦的功放。
3个元件：一个0.几uH的电感串联上1一个8欧（25W）的电阻。这整个再并联一个150欧
的电位器。然后电位器的活动端再接到speaker就搞定了。
大功率的不好搞因为找不到大瓦数的元件。你这个小音箱去frys买些元件就解决鸟。 |
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k*******f
发帖数: 438 | 35 恩，自己动手也不错。我也曾经有过这个打算。
不过买attenuator以后升级换别的音箱也可以用。另外如果你以后还打算卖这个箱子的
话，mod了就不好卖了。my $0.02 |
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k*******f
发帖数: 438 | 36 我是一直没找到我喜欢的小的。而且大的实在是太诱惑了，即使是clean都很rich的感
觉。所以大多数时间都是在用attenuator。 |
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f****g
发帖数: 379 | 37 那就买个小功率amp好了，也不贵。
各种降功率的办法是这样的：
1）一般的master volume是简单的降低进入power amp的信号。问题就在于power amp是
非线性的，就是说必须开到一定音量才好听。当然这时候邻居就不答应。
2）power scaling是通过改变power amp里面的参数比如电压实现。
3）一般大功率那种amp的比如100w->50w切换是通过开关power amp的整个单元实现。
4）attenuator是离开了power amp以后通过使用dummy speaker load减小输入到扬声器
的电流。
使用2,3,4就可以保证把master volume开大，但是出来的音量稍小。
哎，nerdy的EE们搞的 |
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p*******y
发帖数: 944 | 38 ...not sure. OK, I give up due to my knowledge. Below is what Wiki says.
Sorry if my understanding is wrong.
=====================================================
A neutral density filter (ND filter) is a filter of uniform density which
attenuates light of all colors equally. It is used to allow a longer
exposure (to create blur) or larger aperture (for selective focus) than
required for correct exposure in the prevailing light conditions, without
changing the tonal balance of the photograph.
A |
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B*G
发帖数: 13438 | 39 说的很专业，不过减小shot noise除了提高QE，另外很重要的是降低光路attenuation
，把分光镜拿掉。你的read noise五个电子是怎么估计出来的啊
N
ISO100 |
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a*********a
发帖数: 3656 | 40 read noise 和 全井都不是我的，看的clarkvision 或 sensorgen 的数据，具体记不
太清，但数量级肯定是对的。
attenuation |
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m*6
发帖数: 644 | 41 No catch really. Those that complain were most likely referring to having to
buy one UV /skylight for every lens to serve as optical performance
attenuator. (aka protector). Why are the step-up rings cheap? It's a no
brainer. - doesn't cost much to make.
multiple
is |
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H********g
发帖数: 43926 | 42 促卵泡激素
http://en.wikipedia.org/wiki/Follicle-stimulating_hormone
Effects in females[edit]
FSH stimulates the growth and recruitment of immature ovarian follicles in
the ovary.
……………
When the follicle matures and reaches 8–10 mm in diameter it starts to
secrete significant amounts of estradiol. Normally in humans only one
follicle becomes dominant and survives to grow to 18–30 mm in size and
ovulate, the remaining follicles in the cohort undergo atresia. The sharp
increase in estradiol production ... 阅读全帖 |
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f****i
发帖数: 20252 | 43 光纤不是一面镜子，是用两种不同折射率的玻璃实现全反射，其实就是折射，＂电磁波
拐弯＂．你到底学过电磁场和光通讯没？
中波传播距离能比１００MHz的调频广播距离还短？
中波传播方式你自己看Wiki：
http://en.wikipedia.org/wiki/Surface_wave
Radio propagation[edit]
Most long-distance LF "longwave" radio communication (between 30 kHz and 300
kHz) is a result of groundwave propagation. Mediumwave radio transmissions
(frequencies between 300 kHz and 3000 kHz), including AM broadcast band,
travel both as groundwaves and, for longer distances, as skywaves. Ground
losses become lower at lower frequen... 阅读全帖 |
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x*******i
发帖数: 819 | 44 不是hoa, 是你住的那个city的行政法 municipal code ,通常会规定fence 的材料，形
式等等。比如这个http://www.amlegal.com/library/ca/sfrancisco.shtml 或者这个http://www.newportbeachca.gov/index.aspx?page=137
很多地方装fence改fence还要申请permit. 你要的这种我看在很多地方都不行。
这种法规是这种样子，这个还是很宽松的。我家这里更变态chain link都不行。
一部分newport beach的fence ordinances-----
20.30.040 Fences, Hedges, Walls, and Retaining Walls.
This section provides standards for the provision of fences, hedges, walls,
and retaining walls.
A. Maximum Height Allowed.
1. Fences, Hedges, and ... 阅读全帖 |
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x*****u
发帖数: 3419 | 45 China's Hidden Democratic Legacy.
Orville Schell.
Foreign Affairs 83.4 (July-August 2004): p116. (3131 words)
a starting point for reform
Ever since Deng Xiaoping began to undercut Mao Zedong's revolution in late
1978, halting and then attenuated political reform has been the hallmark of
China's ruling Communist Party. Notwithstanding the tectonic events of 1989,
this high-wire act between too much and too little political and economic
reform has kept China relatively stable for almost a quarter |
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a***i
发帖数: 414 | 46 Lin's legend, convoluted by her involvement with a number of celebrities of
early 20th century, popularized by an insatiable public taste for mystery,
has nevertheless been mispresented to a degree that either she is depicted
as one who outshined most of her contemporaries, or she is underrated as an
ordinary female intellectual whose existence only became meaningful with the
presence of her former lover, 徐志摩, and her husband, 梁思成. There might be
truth in both, but the enchantment in Lin did no... 阅读全帖 |
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g***2
发帖数: 403 | 47 我校公派博士生芮浩鹏在PNAS上发表研究成果
发表日期：2010-03-08 | 稿件来源:生物工程学院 | 作者:生工学院 | 编辑:单行线 |
访问量:545
我校生物工程学院生物化工专业05级硕博连读研究生芮浩鹏同学，在国家留学生
基金委公派联合培养博士生项目的资助下，于2008年9月前往美国哈佛大学医学院进行
合作研究。在Mattew K. Waldor教授和张元兴教授的共同指导下，芮浩鹏同学在霍乱弧
菌的致病机理及其疫苗开发领域开展前沿研究，并取得了重要进展，作为第一作者在国
际著名期刊美国科学院院报(Proceedings of the National Academy of Sciences of
the United States of America, PNAS)发表学术论文，该研究成果由哈佛医学院和我
校生物反应器工程国家重点实验室等四家单位联合完成。
新近一期的美国科学院院报报道了芮浩鹏同学关于霍乱减毒活疫苗的研究(
Reactogenicity of live-attenuated Vibrio cholerae vaccines is dep |
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g***2
发帖数: 403 | 48 Reactogenicity of live-attenuated Vibrio cholerae vaccines is dependent on
flagellins
Haopeng Ruia,b,c,1, Jennifer M. Ritchiea,b,1, Roderick T. Bronsonb, John J.
Mekalanosb, Yuanxing Zhangc, and Matthew K. Waldora,b,d,2
+ Author Affiliations
aChanning Laboratory, Brigham and Women’s Hospital, and
bHarvard Medical School, Boston, MA 02115;
cState Key Laboratory of Bioreactor Engineering, East China University of
Science and Technology, Shanghai 200237, China; and
dHoward Hughes Medical Institute, |
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