v********a
发帖数: 646 | 1 面对这个1979年的单身女郎，从中专毕业，到参加成人自考拿到同等学历，然后一路逆
袭，最后傲然在苏州大学就职。
只有两个字：佩服
http://hlxy.suda.edu.cn/jiaoxuekeyan/yanjiushengdaoshiminglu/20
王丽，女，教授，硕士研究生导师
研究方向
慢性病运动康复：重症病者包括心脑血管疾病、骨关节系统疾病和终末期肾病等患者的
运动康复。
体能与疾病：体能水平与疾病发生和预后之间的关系；
社区康复：糖尿病、骨质疏松等的社区康复护理干预。
联系方式
电话：0512-65221499 (办公室); 138-1486-1702 (手机)
邮a class="__cf_email__" href="/cdn-cgi/l/email-protection" data-cfemail="3dd99e875154104a5c535a100c7d4e48595c13585948135e53">[email protected]/* */; [email protected]/* */
地址：苏州市十梓街1号苏州大学护理学院本部20... 阅读全帖 |
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b*****k
发帖数: 80 | 2 First,make a correction for 1):the input signal should be x(wt)
And the output is |H(jw)|x(wt+arg(H(jw))
The result 1) is the eigenfunction property of complex exponentials for
LTI systems. The input sinusoid wave starts from time -infinate,so there
is no Transient response.
When you make the comment like 2),you assume that the sinusoid wave starts from time zero,
i.e. input is x(t)u(t), it is a suddenly applied input,
so there is a transient response.
From the view point of 2),if u assume the i |
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s***l
发帖数: 2236 | 3 I noticed that. and that's why I suspect that there's only sinusoidal
output signal. In that case, what's the use to talk about all kinds
of signal? The bottom line, sinusoidal signal should be available as
long as it is some sort of signal source, no matter sg, fg. but pulse
generator is a different story. There are such applications that want
really fast pulse signal, say in the picosecond range. The duty cycle
is much smaller than one, meaning the repetition rate is much lower
compared to the |
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f**d
发帖数: 768 | 4 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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d*****i
发帖数: 3905 | 5 真是服了，不知道是英语差还是物理差。
继续往下读 Consider a plane sinusoidal pressure wave
如果似乎球面波，前面多一个1/r^2 |
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d*****i
发帖数: 3905 | 6 isotropic是说介质各向同性，不是说波。
这句话后面是 Consider a plane sinusoidal pressure wave
如果似乎球面波，前面多一个1/r^2 |
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D**********s
发帖数: 3139 | 7 Once I had a proceed hpa2, purest 250W for the money.
Class D can be arbitrarily colored by different brands... If there's a
digital input, using the digital input can largely avoid the colorization
from the first order delta sigma modulator. That's also why I love AIR
series (digital input D class with clock sync) active speakers(amp made by
TC electronic?), only having the rear output filter's sinusoidal color.
I am sure in few decades class D & T predominate all portable electronics
and most ... 阅读全帖 |
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l******f
发帖数: 568 | 8 不过这次不怎么对称
A股不同周期，振幅sinusoidal的叠加依旧 |
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g******1
发帖数: 1303 | 9 有个会议 （链接如下），需要审稿人，(我晚上来assign，谢谢大家帮助)
http://www.iasted.org/conferences/home-776.html
请留下你的联系方式以及审稿的题目
Title
First name
Last name
Institute:
Country:
Email:
题目：
2 Threshold Voltage Nonvolatile Flash Memory ， Taguchi Method
3 Biomimetic Methods， Power Plant Optimization
4 Model，Special Purpose Machine
5 REGISTRATION MECHANISM， CLOUD COMPUTING
6 PENETRATION ENERJETIC FLUID JET
7 RISK ASSESSMENT， TERRESTRIAL OIL SPILL
8 Economic Growth， Computable General Equilibrium Model
9 ... 阅读全帖 |
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q*****n
发帖数: 331 | 10 I worked with nanoparticle in vivo. Personally, I don't think Nanoparticle
in general are good for in vivo application, since they tends to accumulate
non-specifically in liver, spleen, bone marrow and lymph nodes, which are
organs with sinusoidal capillary. In addition, they have difficulties
extravasating out of the blood stream.
Too many references for nanoparticle. You need to define a specific
application of it. |
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v***s
发帖数: 16 | 11 right, motor is a low pass filter.
However, harmonic current will cause additonal loss, motor will
be very hot. So it is always required that feeding motor with
pure sinusoidal current.
anq, I suggest you either change the inverter to be a SPWM inverter,
or using a LC filter to filter the high order harmonic.
The first technique is more advanced. You need a high frequency sawtooth
carier wave to perform the PWM. Then the output voltage of the inverter
will contain no low order harmonic, you just |
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S*******p
发帖数: 261 | 12 因为simulation的时候，需要一个随机过程，时间上的相关特性很自然的用
sum of sinusoids获得。当然，也可以用filter一个白噪声来获得。
rayleigh分布的仅仅是某个时间上采样。 |
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W*****0
发帖数: 62 | 13 exp(jwt)+exp(-jwt)= 2cos(wt), left + righ = a sinusoid. |
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l****9
发帖数: 66 | 14 1
National Council of Examiners for Engineering and Surveying
Principles and Practice of Engineering Examination
Electrical and Computer—ELECTRICAL AND ELECTRONICS Exam Specifications
EFFECTIVE Beginning with the April 2009 Examinations
Approximate
Percentage of
Examination
I. General Electrical Engineering Knowledge 50%
A. Circuit Analysis 25%
1. Passive components
2. DC circuits
3. Sinusoidal analysis
4. Transient analysis
5. Power and energy calculations
6. Battery characteristics and ratings |
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k******w
发帖数: 269 | 15 一组DATA 只是WHITE NOISE
另一组是WN和一个WEAK SINUSOID
如何区别呢？有什么CODE可以直接测出来么
谢谢啦 |
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z*****n
发帖数: 7639 | 16 Your statement is not correct.
If highest frequency is B, then a sampling rate of 2B is
called the "lower bound" by which the signal can be
reconstructed.
The reason is: for the sampling rate 2B and a sinusoidal X
of B-Hz, the sampling point may fall at any point of
[0, pi) radians of X. When it falls at 0, then we get
all 0 input; when it falls at pi/2, then we get
B with full magnitude. However, because [0,pi) is a continous
domain, the chance to be on any certain point is negligible,
so in th |
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b**********g
发帖数: 32 | 17
I wasn't clear about your problem. I assumed you've 8-bit ADC, but
processed with much higher precision digital filter. Otherwise, you
would not be able to represent the "ideal y".
I agree with your second comment. In real world, there are very few
situations where the statistical properties are known, and are
stationary, that's why I suggested using RLS filters, i.e. digital
filters with dynamic coefficients.
If u is bounded and band-limited, it should not be hard to design a
stable filter.
BT... 阅读全帖 |
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g****t
发帖数: 31659 | 18 定常差分方程有解析解，就考虑什么实现可以让结果离解析解最近吧。
不考虑固定长度数了。就考虑IEEE浮点数吧。串联，并联，状态方程，
前后滤波等等各种实现里面，哪种实现可以使
|y的解析解-滤波器输出的IEEE浮点数y(t)|^2
10年内的积分最小？
已知u(t)带宽有限，每点有界。x^2=ax+b的解都在单位园内。
这个问题应该是well defined的吧br />
(如果这还不够，可以假设u(t)是三角函数的
线性组合。)
RLS跟我说的(1)好像没有关系。另外说到RLS，就算是浮点数，matlab,任何一种RLS
的实现都无法保证numerical stability。这个更不可靠。必须隔段时间reset或者作别
的经验主义前后处理。
其实我问这问题,是因为我不是数字滤波器的专家.
不了解常用必须的engineer fix,老怕自己弄出来的东西blow up了.
看看有没有fast solution,牺牲点性能也可以.
I wasn't clear about your problem. I assumed you've 8-bit ADC, but
proc... 阅读全帖 |
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a***a
发帖数: 2493 | 19 冯秉铨，电子学家、教育家。先后在发展电子振荡理论和无线电广播发射技术等领域作
出了重要贡献。他所提出的强力振荡器相角补偿法、抑制脉宽调幅发射机残波辐射法，
以及用射频削波法解决我国边远地区广播覆盖面积有限和抗干扰能力差问题的方案，均
得到肯定与应用。执教50年，培育人才，成绩卓著。
中文名
冯秉铨
国 籍
中国
出生地
河北省安新县
出生日期
1910年11月21日
职 业
电子学家、教育家
毕业院校
清华大学
目录
1个人履历
2人物生平
3技术成就
4主要论著
1
个人履历
编辑
1910年11月21日 出生于河北省安新县。
1926年 北京汇文中学毕业后考入清华大学物理系。
1930年 清华大学物理系毕业后即应聘至广州岭南大学任助教。
1932-1934年 在北京燕京大学研究院攻读硕士学位直至毕业。
1935-1937年 任广州岭南大学副教授。
1938-1939年 任广州岭南大学物理系代主任。
1940-1946年 在美国哈佛大学留学，获得博士学位，并在该校任教。
1947-1951年 任广州岭南大学教授、岭南大学理工学院院务主任、岭南大学教务长。
1951-195... 阅读全帖 |
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a******e
发帖数: 80 | 20 Is there an IC that can measure the phase of a sinusoidal current?
For example, the US mains is a 120V, 60Hz sine voltage. The phase of the
sine voltage is known as the sine voltage is generated by the power station.
However, the phase of the current in the mains is unknown as the current is
load dependent (the load can vary with the time). Is there a commercially
available IC that can measure the phase of the sine current. The ac current
may consist of a main frequency component and some harmon... 阅读全帖 |
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s****o
发帖数: 18 | 21 【 以下文字转载自 EE 讨论区 】
发信人: swzhao (Joshua), 信区: EE
标 题: 问个问题：harmonic distribution
发信站: BBS 未名空间站 (Tue May 23 00:09:32 2006)
看到一片文献提到：by sampling a sinusoidal signal with uniform provability
over a period, the samples have an harmonic distribution. And the harmonic
distribution is given by
p(x) = 1/(pi*sqrt(2*\sigma^2-x^2)), for |x|
the variance of RV x.
There is no reference for this claim. And I cannot find a good reference by
google. Is this a straight or famou |
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f******n
发帖数: 176 | 22 Forgot who asked about an "easier" understanding about Fourier analysis.
Today i was reading a paper on wavelet time series analysis, the author
summerized Fourier analysis as follows:
Traditional Fourier analysis partitions the total power (variance) of the
time series between sinusoidal components at different frequencies.
I think it's neat. |
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n**********n
发帖数: 8 | 23 尊敬的大牛们,
I am working on a research project which decomposes arrival data into its
constituent sinusoidal waves of varying frequencies using spectral analysis.
I don't know much about Fourier transformation. I wonder if you have
experience in this(Matlab or just concept wise). I am happy to compensate
for your time at hourly basis.
非常感谢您的帮助! |
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s*******d
发帖数: 1079 | 24 学友MILK找到的这个FA ２０１１版 vs ２０１０版的详细对照，我觉得很有帮助，放
在这儿给大家做参考吧。
原文见 http://forums.studentdoctor.net/showthread.php?t=785943
Overall:
- FA 2011 corrects some of the 2010 errata
- FA 2011 has darker print and thicker pages
- FA 2011 increases the size of most figures/images (although only slightly)
- FA 2011 removes several images that are difficult to see/interpret
Behavioral Science:
p. 59-60 2010 (57-58 2011) -2011 reorganized a couple items into "Advance
directives" and got rid of "Good Samaritan Law.... 阅读全帖 |
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e****0
发帖数: 678 | 25 Endometrial hyperplasia types. Risk of cancer treatment
simple 1% Cyclic progestin
complex 3% Cyclic progestin
Simple atypical 8% THA or progestins
Complex atypical 29% THA or progestins
• Prolatinoma and hypothyroidism galactorrhea
• Anesthesia can reduce uterine activity if in the latent phase
• Contraceptive for lactating mother
Progestin-only oral contraceptive
• Pregnancy luteoma
African-ameri... 阅读全帖 |
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a********0
发帖数: 34 | 26 Conceptually, viscosity and internal friction is the same thing. But you can
measure it by different means, resulting in different quantities and units.
Viscosity is a measure of stress at a certain strain rate. Glass's viscosity
may be very high but because it can still flow its viscosity is still
finite. You can directly measure viscosity based on its definition.
I don't know much about "phonon lifetime" but I guess you are talking about
some mechanical relaxation test, probably using acoustic... 阅读全帖 |
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k******w
发帖数: 269 | 27 一组DATA 只是WHITE NOISE
另一组是WN和一个WEAK SINUSOID
如何区别呢？
谢谢啦 |
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t*****9
发帖数: 19 | 28 Hi, you've got it. The difference point (peak) is the corresponding
frequency for the sinusoid. The periodogram for WN is roughly constant line,
if I am not mistake.
hope this helps. |
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k******w
发帖数: 269 | 29 nope
the problem is the sinusoid is really weak
I can't recognize it by the raw periodogram
line, |
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