l*******k 发帖数: 1974 | 1 从网上下载了器件公司的Pspice model。仿真不工作。写信给他们,他们改了一下,回
了过来。说问题解决了。我试了试,还不行。
麻烦高手给看看。哪里有问题。
我用的是Pspice 9.2.3。有capture的。
从他们发过来的model file看,也是9.2.3的。
多谢,
{\rtf1\ansi\ansicpg1252\deff0\deflang1033{\fonttbl{\f0\fswiss\fcharset0
Arial;}}
{\*\generator Msftedit 5.41.15.1515;}\viewkind4\uc1\pard\f0\fs20 * PSpice
Model Editor - Version 9.2.3\par
\par
* source EPC1012DEV1\par
* Revisions: \par
* 10/19/10: Changed voltage dependent capacitances to be compatable with
PSPICE.\par
* 10/19/10: Added updated RDSON param... 阅读全帖 |
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r*********n 发帖数: 13992 | 2 ☆─────────────────────────────────────☆
bernardsean (伯纳德.肖恩) 于 (Wed Sep 26 16:55:33 2012, 美东) 提到:
看把熊猫忙的。
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Cynric (噢侧那) 于 (Wed Sep 26 16:56:38 2012, 美东) 提到:
五角兽今天略狠阿
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x5 (买时多流汗,卖时少流血) 于 (Wed Sep 26 16:57:41 2012, 美东) 提到:
我要略狠小黑屋就得客满了
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Cynric (噢侧那) 于 (Wed Sep 26 16:58:20 2012, 美东) 提到:
好怕怕阿..
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projective (草地小护士|数风流人物 都穿秋裤... 阅读全帖 |
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c********y 发帖数: 30813 | 3 disclaimer:你如果给我少于10个包子,你的rp就会受到很大的伤害。
cosh(z+1/z) = \Sigma_{-\inf}^{\inf} a_n z^n
= a_0 + \Sigma_{1}^{\inf} a_n (z^n + 1/z^n)
a_n = 1/(2\pi i) \int_L cosh(z+1/z)/z^{n+1} dz
let z = e^{i\theta}
a_n = 1/(2\pi) \int_{-\pi}{\pi} cosh(e^{i \theta } + e^{-i \theta })e^{-ni\
theta} d\theta
=1/(2\pi) \int_{-\pi}{\pi} cosh(2cos( \theta )) ( cos n\theta - sin n\theta
) d\theta
= 1/(2\pi) \int_{-\pi}{\pi} cosh(2cos( \theta )) ( cos n\theta ) d\theta
写得累死了,细节你自己去完善吧,反正就是这个个道理 |
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w*******d 发帖数: 3 | 4 1) to tell if x(n) is real or not, you could compare X(z) with X*(z*) (=Z[x*
(n)]. Since [cosh(aZ*)]*=cosh(az), it should be real.
2) For a system (or signal) to be causal, its ROC should include infinity.
Otherwise it is noncausal. For a system to be anticausal, its ROC should
include zero. Since cosh(aZ) is infinite for Z=infinity, so it could not be
causal. cos(aZ)=1 when Z=0, so zero is included in the ROC. Therefore, cosh(
aZ) is anticausal. |
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d*******2 发帖数: 340 | 5 一篇关于静电MEMS的论文中,说电压V满足拉普拉斯方程,然后说有边界条件
V = (a_x * cos(k_x * x) + b_x * sin(k_x * x) (a_y * cosh(k_y * y) + b_y *
sinh(k_y * y) (a_z * cosh(k_z * z) + b_z * sinh(k_z * z)
但是文章中没有说 a_x, a_y, a_z 及 k_x, k_y, k_z 的物理意义,估计是一个很简单
不值得一说的东西,麻烦这里哪位大牛给说说他们的物理意义? 另外,第一个cos和
sin是不是印错了,应该为cosh和sinh?
先谢了! |
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x5 发帖数: 27871 | 6 ☆─────────────────────────────────────☆
redskeleton (红骨架) 于 (Wed Sep 26 16:04:50 2012, 美东) 提到:
聊了一个小时了。。
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tba (清华棒球联盟) 于 (Wed Sep 26 16:05:27 2012, 美东) 提到:
捷克,来TT?
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poise (Go Hokies) 于 (Wed Sep 26 16:05:35 2012, 美东) 提到:
你旦的?
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xjack (xjack) 于 (Wed Sep 26 16:06:51 2012, 美东) 提到:
哪个啊?
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flashingup (闪爷) 于 (Wed Sep 26 16:07:... 阅读全帖 |
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p***e 发帖数: 29053 | 7 普通青年 : 1+3=4
文艺青年 : 1+3=B
二逼青年: like 獭獭 prove that cosh(z+1/z) = a0 + \sum^\infty_1 a_n(z^n+1/z^
n), where a_n = 1/2pi \int^\infty_0 cos(n\theta)cosh(2cos\theta)d\theta |
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r*****f 发帖数: 247 | 8 f(x,y)=cosh(x+y)/cosh(x-y)
原问题是要找f(x,y)>c时,x,y的关系式。
谢谢。 |
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p*****k 发帖数: 318 | 9 nanfeng1213, seems to me your approach (via m.g.f. / Laplace transform of
the p.d.f.) more or less works, despite all the valid issues raised by
allthesame.
the extra step you need is to take lambda -> -lambda, which results the
following linear equations (tower rule):
E_a * e^(lambda*a) + E_b * e^(-lambda*b) = 1
E_a * e^(-lambda*a) + E_b * e^(lambda*b) = 1
where
E_a = P(W_T=a) * E[e^(-alpha*T)|W_T=a],
E_b = P(W_T=-b) * E[e^(-alpha*T)|W_T=-b]
with alpha = lambda^2/2
thus one gets:
E[e^(-alpha*T)... 阅读全帖 |
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w**z 发帖数: 8232 | 12 http://stackoverflow.com/questions/825221/where-can-i-find-the-
It's a math problem more than CS. Well, don't know how far you want to go..
That is the implementation from math lib
public static double sqrt(double a) {
return StrictMath.sqrt(a); // default impl. delegates to StrictMath
// Note that hardware sqrt instructions
// frequently can be directly used by JITs
// and should be much faster than doing
// Math.... 阅读全帖 |
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n****y 发帖数: 6260 | 13 osh cosh呢?那个裤子我觉得做得比较瘦。 |
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n*****b 发帖数: 2235 | 14 周末朋友聚会,来了一新哥们告诉我们他是个艺术家。我有幸从他的爱疯上面看了两幅
他的作品。第一幅由于我才疏学浅无法google到,但大意是把一个充斥着各种cos/sin/
cosh/sinh的很长的宇宙学公式打印挂到墙上。第二幅是把附件所示(courtesy of
wikipedia)的Graham number打印挂到墙上。
有高手来帮我理解一下吗?诚心请教。 |
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s****h 发帖数: 921 | 15 还有更复杂的信号:
cos(a/z)
cosh(a*z) |
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s****h 发帖数: 921 | 16 1)如何判断real, imaginary or complex?
2)仅仅通过z变换式判断是causal?anticausal?noncausal?
for example: cosh(aZ) |
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S*********g 发帖数: 5298 | 17 拜托,我有贬低唯像理论吗?
SO(5)是唯像的,但是是关于高温超导的。
之前那个是唯像的,但是是关于vortex lattice的,不能划作高温超导类文章。
不要看了点title和abstract,认得type II和GL就以为自己真的懂了。
我用啥ID,管你屁事,你成天cosine,难不成你写paper只写cosine,不写cosh,sin了?
看不懂,没兴趣还不要来瞎参合。
是,我没给他提供详细list,但是我至少正确的给他指出了那片文章不是关于高温超导
的。你除了阴阳怪气,贡献啥了?
再说了,这种review文章,去RMP, Physics Report,搜一下high temperature
superconductivity,一搜一个准。有那么难吗? |
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j********t 发帖数: 97 | 18 10. I think a process with zero drift term is just necessary condition of
martingale, but not sufficient condition. For example,
X(t) = cosh(aW(t))exp(-a^2 t/2) has zero drift in SDE notation but isn't a
martingale according to martingale definition.
18.
E(X^2 | X+Y=1)
= E(X^2, X+Y=1) / E(X^2) By conditional expectation definition,
= E(X^2,Y=1-X) / E(X^2)
= E(X^2)E(1-X) / E(X^2) since X,Y are indepedent
= 1- E(X) = 0.5
Var(X | X+Y=1) = 0.5 - 0.5^2 = 0.25 |
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x******a 发帖数: 6336 | 19 I am not sure if it is cosh(aW(t)) or cos(aW(t))? |
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m******2 发帖数: 564 | 20 是啊好像是个级数,还先用Laplace得到sinh cosh什么的,再inverse |
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h***o 发帖数: 539 | 21 well, 我做出一个解析的解,结果是 (2mE)^(-1/2) * ln (E/(E-A))
下面是我的思路:
先做Integrate [(..), {x, 0, C}],.....(...)里面是偶函数
括号内右边一项直接出来---> C * E^(-1/2).....................(1)
左边一项, 作个参数替换,令 t = E^(-1/2) * sinh[x], (here wrong)
>>>后改为t = E^(1/2) * sinh[x]...then
分子分母同乘cosh[x]即可,积分号外提出一个E^(-1/2)
得: E^(-1/2) * Integrate [((E - A + t^2)^(-1/2)), {t, 0, sinh[C]}]...(2)
Integrate [(x^2 + a^2)^(-1/2)] = ln |x + (x^2 + a^2)^(-1/2)| + constant
~~~~~~~~~~~~~~~~~~~~~~~~~~~wrong
>>> |
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D******n 发帖数: 2836 | 22 create a .vim directory under you home directory(there is a dot before
vim)
and then create a syntax directory under it
and then create a sas.vim file under the syntax directory
==============sas.vim======================
if version < 600
syntax clear
elseif exists("b:current_syntax")
finish
endif
syn case ignore
syn region sasString start=+"+ skip=+\\|\"+ end=+"+
syn region sasString start=+'+ skip=+\\|\"+ end=+'+
" Want region from 'cards;' to ';' to be captured (Bob Heckel)
sy... 阅读全帖 |
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