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w*******y
发帖数: 60932 | 2 Link:
https://www.wwstereo.com/website/ecommerce/productdetail.aspx?product=CC-10
enter coupon code "prememorial"
At checkout price will be $164.50 shipped.
Lots of other specials with that coupon code.
g'luck!
The CC-10 center channel outperforms typical speakers, with power and
performance that will simply rock your favorite music, movies and games. Its
compact design makes it right at home either above or below your monitor.
Center channel speaker for detailed dialogue, big music and effects
... 阅读全帖 |
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z**********e
发帖数: 22064 | 3 http://dailynews.sina.com/gb/chn/chnoverseamedia/cna/20140302/1
http://news.sina.com 2014年03月02日 19:14 中央社即时
（中央社台北3日电）云南昆明日前发生暴力袭击，有大陆网民事前曾在微博留
言「週六有大事」。有人怀疑这名网民是嫌犯之一，而留言者的微博帐号已被封
锁。
中国大陆云南昆明火车站上週六（1日）晚间发生暴力袭击案，造成29人死亡、
143人受伤。大陆当局认定这是新疆分裂势力有预谋的犯罪。
昆明袭击案发生後，大陆新浪网民「Frequency AC」发自2月24日的微博留言被
疯传，留言称「我就是某些战士之一，接下来的几天中大家很快会看到我的。具体
的大事会在这週六发生，敬请关注！」
许多大陆网民质疑，留言者就是其中一名暴徒。
香港明报报导，「Frequency AC」在微博上还留下了一些类似枪的设计图，并
上传了一把刀。
28日袭击案发生的前一天，这名网民又留言说，「我明天就要推动中华民族的
进程了，你们有什么想法要交流吗？」有关微博引起数万网民关注。
对于「Frequency A... 阅读全帖 |
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l******r
发帖数: 57 | 4 The way they tested the resonance does not have any problem. You can see
they increased the frequence of the external forcing gradually. So they knew
the frequence all the time. The only thing they needed to know is when they
can feel the strongest resonance. So when they felt the strongest shaking of
the train, they just needed to take a look at the frequence of the external
foring source to know the resonance frequence of the train. The engineers used the water bottle or hand to feel how stron... 阅读全帖 |
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D**g
发帖数: 739 | 5 "The method, although laborious, is simple in concept and application: By
forming a frequency distribution of a great many words classified according
to their length, it is possible to obtain a graphic representation (called a
"charac- teristic curve of composition" by Mendenhall) that would "become a
means of identification, at least by exclusion."20 The use of this method
assumes that every author unconsciously uses words that, at least in the
long run, could be considered as random drawings f... 阅读全帖 |
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G*******r
发帖数: 657 | 7 http://www.etsist.upm.es/estaticos/catedra-coitt/web_salud_medi
加拿大卫生部这篇文章的第63页有这么一句话，说低于70-100kHz会有刺痛感，但是高
于这个频率人会感到热，了解无线电的朋友们来说说这会是什么设备。
The perception of currents at frequencies lower than 70-100 kHz
is quite different than that from currents at higher frequencies. While
the perception is one of tingling or pricking sensation at frequencies
lower than about 100 kHz, the sensory perception is that of warmth
at the higher frequencies
8E%
E7.
57] |
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发帖数: 1 | 8 这图能说明啥？非洲人跟白人一个频率。
你找的这个维基百科上说的很清楚：The His615Arg allele of OCA2
is involved in the light skin tone and the derived allele is restricted to
East Asia with high frequencies, with highest frequencies in Eastern East
Asia (49-63%), midrange frequencies in Southeast Asia, and the lowest
frequencies in Western China and some Eastern European populations
关键词：restricted
说明东亚人的浅肤色基因是独立形成的，跟白人没半毛钱关系 |
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t**x
发帖数: 20965 | 9 请你仔细看看，
良性的三个报告。其中一个是这个德国医生自己的，他承认自己从来没有看过。第一个
genedx，是我们出院(04/13)后一个月报的(05/13)， 这个极有可能就是我们宝宝的结
果，被报呈良性。
https://www.ncbi.nlm.nih.gov/clinvar/variation/92429/
这个变异发现10多年，欧洲基因库收录为恶性。只有美国报称良性，在我们宝宝刚刚出
院。你真得仔细看看时间和事情了。
你没有看到跨国界作假反而。。。你看看荷兰医生的回信。我真怀疑你到底是干什么的
？
这个变异发现了10多年了， 这个德国医生的链接的文献没有说是良性的， 你自己看看
下面德国医生附上的文献。我不是医生，我看不出来说这个变异是良性的。你如果愿意
看看我家宝宝cpt2的两个结果， 一个1.5%酶活性，一个15%酶活性，跟下面的温度相关
吻合得多好。
我家宝宝的下降更多，大概是因为他的变异更多。这个特征的变异很多年了，但是
cchmc和Baylor都没有查出来。你说说他们不知道？！
Here the excerpt von OMIM regarding this mut... 阅读全帖 |
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t**x
发帖数: 20965 | 10 yangyi和aning我没有跟她/他斗， 我劝你们好好看看德国医生给的参考资料, 这个资
料你怎么得出是benign的结论的：
0018 ENCEPHALOPATHY, ACUTE, INFECTION-INDUCED, SUSCEPTIBILITY TO, 4
CPT2, PHE352CYS AND VAL368ILE [dbSNP:rs2229291] [dbSNP:rs1799821] [ClinVar]
Chen et al. (2005) found an association between 2 thermolabile polymorphisms
in the CPT1 gene and susceptibility to infection-induced acute
encephalopathy-4 (IIAE4; 614212) in Japanese children. The variants were a
1055T-G transversion, resulting in a phe352-to-cys (F352C) substitution (
rs... 阅读全帖 |
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t**x
发帖数: 20965 | 11 我可以跟你说这个写这个文章的医生是一个十恶不赦的王八蛋！因为这个德国医生就是
跟西雅图儿童医院勾结的个婊子养的畜生。
这是我的信：
Von: Andrew Xie [mailto:[email protected]/* */]
Gesendet: Montag, 19. September 2016 13:24
An: Wieser, Dr. Thomas, Chefarzt
Betreff: RE: Question on a benign mutation / NM_000098.2(CPT2):c.1102G>A (p.
Val368Ile) Simple - Variation Report - ClinVar – NCBI
Dear Dr. Wieser,
Thanks for your reply.
In the link it says 3 sources reporting ‘benign’ :
1. GeneDX on May 29, 2013
2. Emory Genetics Laboratory on Apr 16, 2014... 阅读全帖 |
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l*******g
发帖数: 27064 | 12 要说05-08年
这个排名才靠谱
最差的10个，日本车8个，美国车一个，韩国车一个
Lowest claim frequency: Personal injury protection
Vehicle Vehicle size and class Claim frequency
Porsche 911 convertible Midsize sports car 27
Porsche 911 Coupe Midsize sports car 28
Chevrolet Corvette Z06 Midsize sports car 38
Mercedes SL class convertible Midsize sports car 41
Chevrolet Corvette Midsize sports car 42
Saab 9-5 4dr Midsize luxury car 42
GMC Sierra 2500 crew 4WD (NEW) Very large pickup 42
S... 阅读全帖 |
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X***9
发帖数: 7385 | 13
Active Noise Cancellation (ANC)
并非全系都有，以前只有6缸的有，为了减少3缸工作时候带来的噪音（引擎缸数越少噪
音越大。
现在的雅阁是全系都有，但本田一贯低调的态度所以并不刻意宣传自己，所以不是很多
人都知道
拥有新款雅阁的同学可以回家看看自己车子的顶棚，除了前方有个蓝牙的麦克风外，后
排顶上还有一个麦克风
Active Noise Cancellation (ANC) is designed to dramatically reduce low
frequency noise in the interior. The system operates whenever the car is
running, regardless of whether the audio system is on or off.
The microphones capture low-end drivetrain frequencies entering the cabin,
and send a signal to the Active Noise Cancellat... 阅读全帖 |
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s***a
发帖数: 4921 | 14 JBL Venue Series Monitor 5-Inch 2-Way Speakers (Pair) $107.69 Shipped
http://www.fatwallet.com/t/18/652943/
This is about $70 less then most places are selling these.
* Maximum Recommended Amplifier: Power 125 Watts
* Handling: (Continuous/Peak) 60/240 Watts
* Impedance: 8 Ohms nominal
* Sensitivity: (2.83V/1m) 86dB
* Frequency Response: (-3dB) 68Hz - 20kHz
* Crossover Frequency: 3000Hz
* High-Frequency Transducer: 3/4 inch (19mm) Titanium-laminate dome,
shielded
* Low-Frequency Transducer: 5 in |
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s****i
发帖数: 2993 | 15
sound
the science says no difference :)
it's called skin effect. high frequency signal the current only
flow on surface (skin) of the wire, not center. the higher frequency,
the higher the effect.
using different type of wires for low and high frequency, might improve
high signal transmission, as the wire is constructed differently to have
more surface area. however, for audio frequency, the effect is not high
enough and normally all the wire is still used for transmitting the signal,
not jus |
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d******0
发帖数: 22800 | 16 ☆─────────────────────────────────────☆
story9988 (小小故事人) 于 (Mon Jan 3 09:24:25 2011, 美东) 提到:
最近经常用到，随便讲一下。
jitter本身就是一个专业术语，可惜，90%的中文书里面看不到正确的解释，10%的英文
专业书，也会有错误的解释。
jitter是 variety of delay。很清楚，很明白，比方说delay一直是10ms，那么就是
constant了，也就是jitter=0.但是，可能么？
这里就解释了为什么有些人提出cd player加个RAM就可以解决的问题，可以么？
不可以！
这也就是为什么jitter消除不了的原因。
再说一下震动，音响器材里面最怕的就是震动，因为器械一震，会影响很多问题，这也
就是脚钉这样一个神奇之物的主要功效。
但是，震动就一定是不好的么？很多时候歪打正着，很可能就是抵消了有害波，这个时
候，就有意思的。
所以了，HIFI为啥这么多年来一直这么有魅力，一句话：不统一的和谐型。
这也是我老见过最有趣的一个东西，一个早就拥有了一个宗旨：高度还原... 阅读全帖 |
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D**********s
发帖数: 3139 | 18 所以我贴了一下那个计算器，呵呵。不论CD，SACD，LP，录音的时候麦克风都是主要在
20-20k里面的，回放的时候谐振对音色影响挺大。比如回放一个5000hz的高音
Overtones ▼ Harmonics
Overwaves Partial tones
Frequencies in Hz Partials
Input:
Fundamental frequency in 5000 Hz 1st harmonic
Solution:
1st overtone 10000 2nd harmonic
2nd overtone 15000 3rd harmonic
3rd overtone 20000 4th harmonic
4th overtone 25000 5th harmonic
5th overtone 30000 6th harmonic
6th ... 阅读全帖 |
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p********e
发帖数: 16048 | 19 看了下 162 的spec
Frequency Response (±3dB) 49Hz - 20kHz
Recommended Power Amplifier Range 10 - 150 watts
Sensitivity (2.83V @ 1m) 90dB
Nominal Impedance 8 ohms
Crossover Frequency(ies) 3,000Hz; 24dB/octave
Low-Frequency Driver 6-1/2" (165mm) MMD?
High-Frequency Driver 3/4" (19mm) MMD?
90dB啊！！！ 8 ohm !!!!! |
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t**s
发帖数: 156 | 20 有没有用过的请评论一下？
另外， 这两个箱子用yamaha rx-a700 可以推的好吗？ 多谢了！
jamo c803:
Frequency Response (Hz, +/-3dB): 45 - 24,000
Power (W, long/short term): 125 / 250
Impedance (Ohm): 6
Sensitivity (dB, 2.8V/1m): 87
Crossover Frequency: 2 kHz
Kef q300:
Frequency Response ±3dB: 42Hz - 40kHz
Crossover Frequency: 2.5kHz
Amplifier requirements: 15 - 120W
Sensitivity (2.83V/1m): 87dB
Maximum output (SPL): 110dB
Impedance: 8Ω
yamaha rx-a700:
Rated Output Power (20Hz-20kHz, 2ch driven): 90W (8ohms, 0.08%... 阅读全帖 |
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g*******a
发帖数: 46 | 21 这对音箱现在有特价，正在打算组建家庭K歌系统，音箱不在行，所以请教了。
http://www.frys.com/product/7580966
BUILT FROM: 2010
CROSSOVER FREQUENCY: 2250Hz
DEPTH: 8" (20.3cm)
ENCLOSURE TYPE: Bass-reflex via rear-firing port
FINISH: Black Ash vinyl
FREQUENCY RESPONSE: 62Hz-23KHz ± 3dB
HEIGHT: 12.5" (31.8cm)
HIGH FREQUENCY DRIVER: .75" (1.9cm) Aluminum diaphragm compression driver
mated to 90° x 60° square Tractrix® Horn
INPUTS: Single binding posts
LOW FREQUENCY DRIVER: 5.25" (13.3cm), magnetically shielded IMG woofer
NOMINAL IMP... 阅读全帖 |
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j****y
发帖数: 1714 | 22 ‘The stock market is for suckers’
http://www2.macleans.ca/2011/01/24/the-stock-market-is-for-suck
Jan 24, 2011 by Jason Kirby
Justin Sullivan/GETTY IMAGES
Were it not for the source and recipients of the email—From: Goldman
Sachs, To: Our most outrageously rich clients—it would have read like
one of those Nigerian investment scams that slip through spam filters
now and then. “When you have a chance I wanted to find a time to discuss
a highly confidential and time-sensitive investment opportunity... 阅读全帖 |
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m****r
发帖数: 141 | 23 Given a sequence of data (with duplicates), move a fix-sized window along
the data sequence and find mode in the window at each iteraion, where the
oldest data is removed and a new data is inserted to the window.
I cannot find better solutions here.
My idea: Use a hashtable, key is the data, key's data is the frequency of
the data occuring in the window.
At the first iteration, iterate each data in the window and put it to the
hashtable, meanwhile cout the frequency of each data. After that, tra... 阅读全帖 |
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A*********c
发帖数: 430 | 24 1: 用了两种方法，
文件上的数字没有排序。
方法一是disk Merge sort每个文件然后用 heap加counter来解，因为能算出median的
位置。
方法二是int的范围是2^32, 就是约4*10^9，每个文件有10^12个数字，那么一定有很多
重复。提前处理各个文件统计频率，得到一个vector表示frequency。vector的下标可
以一一按顺序映射道所有整数。
每个文件可以得到一个这样的vector，然后从最小的数字累计frequence，直到累计
frequency等于N/2，那么就是找到了upper median。有两个细节，第一是要用vector<
int64_t>因为所有数字都一样的话超过整型范围。第二是可以用sparse
representation pair 表示frequency。
2: Open Question。用的类似于rejection sampling的方法，每次得到随机结果，看加
过没，然后按照vote排序加入结果集。最后可以讨论了能否接受近似结果。对于friend
，我的提议是先检查friend acti... 阅读全帖 |
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i**s
发帖数: 332 | 25 请指导一下如何理解房子的有关信息,比如网上列的51万的房子,
Finances & Fees
* Tax Year: 2009
* Total Taxes: $5,446.72 ---1)
* Total Taxes Frequency: Annually
* City Tax: $978.96 ---2)
* City Tax Frequency: Annually
* County Tax: $4,463.47 --3)
* County Tax Frequency: Annually
1)不知道是什么税,难道一年所要纳税 = 1) + 2) +3) = about $11,000 ?
Assessment Information
* Year: 2009
* Total Assessment: $429,180.00 --1)
* Total Assessment Frequency: Annually
* Special Tax Assessment: $4.29 2) |
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H******7
发帖数: 34403 | 26 Some web sites recommend using a cell phone to test a microwave oven for
radiation leakage. You are supposed to put your cell phone in the oven and
try to call it. If it rings, it is supposed to indicate a leak. However,
this method is wrong because cell phones operate at different frequencies
than microwave ovens. Even if the cell phone rings in the oven, this does
not indicate a leak, so it is nothing to worry about. Protection against
microwave leakage in microwave ovens is specifically tuned... 阅读全帖 |
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w*******a
发帖数: 428 | 27 详细资料如下:
Lightning Mandarin: -- Learn Chinese Characters 6+ Times Faster to Reach 90%
Coverage
Amazon Best Sellers Rank:
#35 in Books > Children's Books > Education & Reference > Foreign Language
Learning > Chinese
#35 in Kindle Store > Kindle eBooks > Reference > Foreign Language Study &
Reference > Language Instruction > Chinese
#65 in Kindle Store > Kindle eBooks > Children's eBooks > Education &
Reference > Foreign Language Learning
1. This book presents a “mind map” approach to Chinese chara... 阅读全帖 |
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t******l
发帖数: 10908 | 28 Piano Practice with High-Frequency Hearing Loss
http://www.grandpianopassion.com/2013/09/18/ricker-choi-high-frequency-hearing-loss/
[quote]
What is it like for you, living with a high-frequency hearing loss?
When there are a lot of people talking in meetings at work, or at a
restaurant, I find I have trouble following the conversation. The hearing
doctor said I have trouble distinguishing consonants due to high-frequency
hearing loss.
[/quote]
所以高频段听力受损对实际生活的影响，是分辨辅音的困难。。。当初混过大学酱油小
乐队的，中年以后都知道听... 阅读全帖 |
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G*********2
发帖数: 164 | 29 For 2G, only the US uses GSM 850 / 1900 frequencies. All the rest of the
world, including China, 中国移动 and 中国联通 (中国电信 uses CDMA), use GSM
900 / 1800 frequencies.
For 3G, only HSDPA 2100 frequency from that handset may be used for 中国联通
. 中国移动 uses TD-SCDMA 1900 / 2000 frequencies, which are not used
anywhere else.
So, this handset is not much of use outside of the US. |
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t***y
发帖数: 2276 | 30 哇靠，机器人真的是在打架呢：
机器人的交易占总交易的70%？太可怕啦。我还以为我们在和退休的老头老太太斗呢，只有他们才有空不
上班。
High-frequency traders compete on a basis of speed with other high
frequency
traders, not long-term investors (who typically look for opportunities
over
a period of weeks, months, or years), and compete with each other for
very
small, consistent profits.[5][6] As a result, high-frequency trading has
been shown to have a potential Sharpe ratio (measure of reward per unit of
risk) thousands of times higher than the traditional buy-... 阅读全帖 |
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m********0
发帖数: 2717 | 31 I was over-reacting, sorry.
I agree with you consistency is the key. And I always believe in consistency
makes ATM.
Market evolves, a lot strategies works well does not work any more.
Meanwhile, there are more strategies been created, more systematic framework
, more computing power to search patterns, even patterns like short X every
trading day around XX:XX(maybe combined with market up/down for that opening
). I have a few candidates in my mind.
And there are different *market inefficiency* i... 阅读全帖 |
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j****y
发帖数: 1714 | 32 发信人: joyjoy (joy), 信区: Investment
标 题: The stock market is for suckers[zt]
发信站: BBS 未名空间站 (Sat Feb 12 10:25:03 2011, 美东)
‘The stock market is for suckers’
http://www2.macleans.ca/2011/01/24/the-stock-market-is-for-suck
Jan 24, 2011 by Jason Kirby
Justin Sullivan/GETTY IMAGES
Were it not for the source and recipients of the email—From: Goldman
Sachs, To: Our most outrageously rich clients—it would have read like
one of those Nigerian investment scams that slip through spam filters
now and then. ... 阅读全帖 |
|
R*****s
发帖数: 41236 | 33 【 以下文字转载自 Fitness 讨论区 】
发信人: dai (百合开过·风烛残年), 信区: Fitness
标 题: ★★★ 跑步运动 FAQ ★★★
发信站: BBS 未名空间站 (Fri Apr 17 05:17:00 2009), 站内
此FAQ在whx大侠原帖上修改而成，在此特向whx致谢
1. 跑步基本姿势：
长距离的跑步，也就是2迈以上，强调是效率。首先要注意的是不要故意迈大步子，要
高步频，每分钟至少150步，理想状态是180步，跑快时步频可能到190。要想象腿不是
在往前迈而是往后滑和摆动。脚落地的方法，前脚掌落地或者是脚跟落地是因人而异的
，一般最好前后脚掌同时落地，落地的声音越轻越好。这些基本原则，在哪里跑都一样
，无论是跑步机，土地，草地，碎石路，柏油路，水泥地，都可以跑。
请见最好的跑步者，Haile Gebrselassie的跑步姿势。这是他创造马拉松世界纪录的时
候：
http://www.youtube.com/watch?v=m_1tNidyhN8
注意看他的腿几乎总是在身体的后面，而且非常的smooth. 这时他的速度是12.7 mph.
H... 阅读全帖 |
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R*****s
发帖数: 41236 | 34 【 以下文字转载自 Fitness 讨论区 】
发信人: dai (百合开过·风烛残年), 信区: Fitness
标 题: ★★★ 跑步运动 FAQ ★★★
发信站: BBS 未名空间站 (Fri Apr 17 05:17:00 2009), 站内
此FAQ在whx大侠原帖上修改而成，在此特向whx致谢
1. 跑步基本姿势：
长距离的跑步，也就是2迈以上，强调是效率。首先要注意的是不要故意迈大步子，要
高步频，每分钟至少150步，理想状态是180步，跑快时步频可能到190。要想象腿不是
在往前迈而是往后滑和摆动。脚落地的方法，前脚掌落地或者是脚跟落地是因人而异的
，一般最好前后脚掌同时落地，落地的声音越轻越好。这些基本原则，在哪里跑都一样
，无论是跑步机，土地，草地，碎石路，柏油路，水泥地，都可以跑。
请见最好的跑步者，Haile Gebrselassie的跑步姿势。这是他创造马拉松世界纪录的时
候：
http://www.youtube.com/watch?v=m_1tNidyhN8
注意看他的腿几乎总是在身体的后面，而且非常的smooth. 这时他的速度是12.7 mph.
H... 阅读全帖 |
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p***r
发帖数: 4859 | 35 http://www.runblogger.com/2012/04/effect-of-step-rate-on-lower-
Just over a week ago Amby Burfoot wrote a post about a new study from Japan
that provides additional evidence supporting the benefits of a shorter strid
e for reducing loading of the lower limbs. The study by Hobara et al. is tit
led Step Frequency and Lower Extremity Loading During Running and was publis
hed in Orthopedics and Biomechanics. I thought I’d follow up with a few tho
ughts of my own.
In the study, Hobara et al. wanted t... 阅读全帖 |
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R*****s
发帖数: 41236 | 36 【 以下文字转载自 Tri 讨论区 】
发信人: Rodimus (变叔- 全情投入), 信区: Tri
标 题: Strokes Of Genius: Use Swimming To Stay Fit
发信站: BBS 未名空间站 (Tue Jul 31 20:57:09 2012, 美东)
Strokes Of Genius: Use Swimming To Stay Fit
http://www.bodybuilding.com/fun/strokes-of-genius-use-swimming-
Swimming is a survival skill, but it is also a high-end full-body workout
that increases your aerobic potential and also offers resistance. It抯 a win
win win.
by Shannon Clark Jul 30, 2012
From the moment human beings find themselves immersed ... 阅读全帖 |
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k**0
发帖数: 19737 | 37 sony xba4 的Frequency response range很广， 而shure 535/ 海森IE80的Frequency
response range比数据差很多， 但是音质535/IE80好， 所以看纸面数据不能完全作为
凭据，
明白了没？
这是你的原帖
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发信人: tuziwang (a.k.a. 毛兔, 兔子, Kaiju), 信区: TVGame
标 题: Re: 索尼断肢求生
发信站: BBS 未名空间站 (Fri Feb 7 13:19:58 2014, 美东)
嗯， 那是当然， 这个niche market就是这么创造出来的
像Bose这种厂家的官网上耳机的数据一个有用的都没有
至少要有个 Frequency response， sensitivity ， driver的impedence
吧
有一句
Active equalization electronically tunes the headphones' frequency re... 阅读全帖 |
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g****n
发帖数: 13 | 38 【 以下文字转载自 Music 讨论区 】
【 原文由 guajin 所发表 】
Hi, all
I am working a project of musical acoustics.
But I know nothing about music so I want to ask this stupid question.
WHAT IS P|TCH AND TIMBRE?
In my understanding, pitch is represented by a set of frequencies:
one fundamental frequency, and many others which are nearly integer
multiple of the fundamental frequency.
So different pitches have different fundamental frequencies.
But for different instruments, even the same pitch sounds different.
That i |
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x****e
发帖数: 1773 | 39 You might have known that they could register for a relationship called
civil union.
You may want to know that what they called "born gay" is actually a theory,
UNCONFIRMED, even though that has been in gay propaganda for about 30 years.
And you may want to know that social environment DOES increase the
frequency of kid to grow into gay. Have that being said, introduction of pro
-gay content would certainly increase the chance of your kid to grow into a
gay.
Based on what the gay radicals have d... 阅读全帖 |
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m*****n
发帖数: 7450 | 40 http://www.iflscience.com/brain/scientists-selectively-erase-an
Scientists Selectively Erase And Restore Memories
In a groundbreaking new study, researchers at the University of California,
San Diego erased and then reactivated memories by stimulating neurons in the
brains of genetically engineered rats with a series of light pulses that
have been previously shown to strengthen or weaken the connections between
brain cells. This is the first study to be able to directly show that the
strengtheni... 阅读全帖 |
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f****i
发帖数: 20252 | 41 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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w*******a
发帖数: 428 | 42 详细资料如下:
Lightning Mandarin: -- Learn Chinese Characters 6+ Times Faster to Reach 90%
Coverage
Amazon Best Sellers Rank:
#35 in Books > Children's Books > Education & Reference > Foreign Language
Learning > Chinese
#35 in Kindle Store > Kindle eBooks > Reference > Foreign Language Study &
Reference > Language Instruction > Chinese
#65 in Kindle Store > Kindle eBooks > Children's eBooks > Education &
Reference > Foreign Language Learning
1. This book presents a “mind map” approach to Chinese chara... 阅读全帖 |
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s*****0
发帖数: 357 | 43 周末杂事比较多，小孩的playdate，还有和朋友约定的网战等等，未能及时更新，见谅。
感谢楼上hbsr2010的一些概念更正，平时理论接触的少了，记忆有偏差，因为在网上随
便写些，也懒得查书，写的时候随兴所至，没有太注意。我尽量让文笔轻快些，让读者
不至于厌烦。以后尽量会避免误导，如有不确实之处，请务必指正。先行谢过了，因为
有自己的一摊东西要收拾，不能像做科研那样严谨了。
前文提到的t test, one way ANOVA以及相关的nonparametric都只有涉及到一个
variable，比如作对照实验，variable即treatment type，不同计量药物或者是
placebo。组和组的区分是由这个variable决定的。在涉及到更为复杂的模型前(比如
two way ANOVA, multiple regression)，我觉得还是先唠叨唠叨categorical data的
统计方法，毕竟做multiple regression之类的工作需要一定的统计背景，平时远没有
Chi-square这样的test用得多。所以先简后难了。
Categorical data在生... 阅读全帖 |
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U******u
发帖数: 5829 | 44 shyj: 我的考版match路--以此文纪念在美国逝去的10年青春
http://mitbbs.com/pc/pccon_2289_t379_150975.html
发信人: shyj (baobao), 信区: MedicalCareer
标 题: 我的考版match路-以此文纪念在美国逝去的10年青春 (很长很罗嗦，慎入！）
发信站: BBS 未名空间站 (Sat Apr 3 17:31:55 2010, 美东)
Match的结果终于尘埃落定，周1等电邮的时候非常紧张，因为成败就在此了，虽然一直
告诉自己，今年只是热热身，成败都可以接受，但到真的揭晓的时候，还是很紧张，毕
竟一旦卷入其中就身不由己，何况自己也还是有所付出。到周4等match program的时候
虽然也有点紧张，但程度已经大大减少，1个原因是毕竟match上才是头等大事，去哪里
尚在其次，还有1个原因是心理还是有所准备了，虽然希望留在home school，但直觉告
诉我恐怕是非常困难了，在我rank list上第二位的program应该就是我要去的地方，果
不其然。经过几天的等待，发现果然是要搬家了。
对于我... 阅读全帖 |
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l**********1
发帖数: 5204 | 45 细菌 贫营养的状态 若其lac operon进入 1/3 subharmonic oscillatory 状态的话 就是细菌的睡觉吧
具体参看下边的Goodwin BC 1965 paper
Introducing mutual coupling between the oscillators, with klz = 1.2, km = 0.
4, a phenomenon known as
subharmonic resonance is observed as shown in Fig. 9. Both variables now
have the same frequency, which is considerably smaller than either of the
free-running frequencies. The lower curve is Y~, and in it one can still see
the
original frequency on which has been superimposed the slower frequency of... 阅读全帖 |
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I********w
发帖数: 86 | 46 I don't quite understand the solution frequency in HFSS setting.
What kind of solution does HFSS get at this single frequency? S parameter?
How could it use a single frequency solution to get a result over a
frequency range?
Thanks for your input. |
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G***T
发帖数: 66 | 47 1. solution frequency decides wavelength therefore determine the initial
mesh size and total meshs in the simulation. What happened in HFSS is based
on your solution frequency, HFSS will generate a initial solution, which
includes the mesh, port solution and etc. based on that frequency.
2. After the inital solution, HFSS will automatically refine the mesh and
perform a full solution until convergence based on that single solution
frequency.
3. If your model can be convergented at your solution |
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j***j
发帖数: 324 | 48 losses in switched mode DCDC are mainly from switching loss and conduction loss.
conduction loss is proportional to the current or current square and dorminant at heavy loads, so high frequency PWM control is used. At light loads, switching losses are dornimant, so to improve the efficiency and decrease the switching frequency, PFM is always used.PFM frequency changes with load current. At heavy loads, under PFM mode, frequency will be too high which is not good for lots of things.
btw: normally |
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