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全部话题 - 话题: constant
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m****z
发帖数: 978
1
来自主题: Swimming版 - 【拔苗】新手来拜码头来拜师
嗯,同意。我特懒。一直在调整动作,watch youtube, read books,每次练也就是
30mins. 没有video,就来口述。
When I went to our local library for kids books, I grabbed couple swimming
books. I forgot most of their titles, but Easy Freestyle by TI swimming
really did “sink in”. I started learning freestyle from scratch, mainly
focus on streamline and rotation. I fall in love with swimming again.
Everything felt so nice and relaxed.
Then I read Swim Speed Secrets by Taormina, Sheila, who mainly or only talks
about arm stroke in... 阅读全帖
m****z
发帖数: 978
2
来自主题: Swimming版 - 【拔苗】新手来拜码头来拜师
嗯,同意。我特懒。一直在调整动作,watch youtube, read books,每次练也就是
30mins. 没有video,就来口述。
When I went to our local library for kids books, I grabbed couple swimming
books. I forgot most of their titles, but Easy Freestyle by TI swimming
really did “sink in”. I started learning freestyle from scratch, mainly
focus on streamline and rotation. I fall in love with swimming again.
Everything felt so nice and relaxed.
Then I read Swim Speed Secrets by Taormina, Sheila, who mainly or only talks
about arm stroke in... 阅读全帖
m****z
发帖数: 978
3
来自主题: Tennis版 - New String Tip (enlarge sweet spots)
Come across this article at Http://www.tennisindustrymag.com/issues/201409/index.php
To me, its main idea is to create lower tension around the edge of the
racquet to enlarge the sweet spot. At the same time, keeping the center of
racquet similiar to the current power level, so it won't be to powerful at
the center. Large sweet spot and off center shot play closer to sweet spot.
And sweet spot will not be too powerful.
My machine does not have pre-streach function, so I will just pull the
ce... 阅读全帖
g****g
发帖数: 1828
4
来自主题: WaterWorld版 - How Often Should You Check Your Email?
Depending on how you use it, email communication can be a way to interact
effectively with people and make your work more efficient, or a major source
for decreased productivity, stress and an early ulcer. Unfortunately, for
many, it’s the latter.
As a communication coach, I am often asked be people looking to improve
their business communication skills: “How many times should I check my work
email each day?” Then they look at me with astonishment as I reply that
twice every day is usually the o... 阅读全帖
d**********o
发帖数: 1321
5
来自主题: WebRadio版 - 潜水员冒泡兼征版友意见
hw3b c-.y file
上面这一楼贴了载止hw3b deadline时我match的结果(也就是老师可以以这些不match
的ERROR为借口不给后来我补上的成绩),但是因为当时我还是没有写完,后来感恩节
期间就接着又写了一些,而且hw5是based on hw3 & hw3b的基础上(当我hw5是based
on更好的hw3的结果时,我应该可以得更多的分吧)。
hw4因为写得比较顺利,就不曾保留任何交上去作业的output,没有什么一目了然的结
果是我可以贴在这里的。原本我是想要把自己最的一次作业hw5贴出来的,但那已经是
一个完整的compiler,而且以后我还需要用自己的course project来找工作,所以一定
就不贴最终结果了。那就贴一个hw3b的c-.y文件吧,它集中的hw1、hw2、hw3、 hw3b的
结果,是我自己hw3b *.y文件的最完整版本。这些作业里面也有很多机关一一人为增加
的难度,比如那六七个IO相关的function,不仅traverse tree、build syntax tree的
时候会成为一个考点(把它们作为一个node连在syntax... 阅读全帖
d**********o
发帖数: 1321
6
来自主题: WebRadio版 - 潜水员冒泡兼征版友意见
hw3b c-.y file
上面这一楼贴了载止hw3b deadline时我match的结果(也就是老师可以以这些不match
的ERROR为借口不给后来我补上的成绩),但是因为当时我还是没有写完,后来感恩节
期间就接着又写了一些,而且hw5是based on hw3 & hw3b的基础上(当我hw5是based
on更好的hw3的结果时,我应该可以得更多的分吧)。
hw4因为写得比较顺利,就不曾保留任何交上去作业的output,没有什么一目了然的结
果是我可以贴在这里的。原本我是想要把自己最的一次作业hw5贴出来的,但那已经是
一个完整的compiler,而且以后我还需要用自己的course project来找工作,所以一定
就不贴最终结果了。那就贴一个hw3b的c-.y文件吧,它集中的hw1、hw2、hw3、 hw3b的
结果,是我自己hw3b *.y文件的最完整版本。这些作业里面也有很多机关一一人为增加
的难度,比如那六七个IO相关的function,不仅traverse tree、build syntax tree的
时候会成为一个考点(把它们作为一个node连在syntax... 阅读全帖
o******1
发帖数: 12177
7
that is impossible. the reason that the light speed is a constant is not
because Einstein measured that way, and some other theories could measure in
a different way. The fact that light speed is a constant is because it is
entertwined with the fundamental structure of the space of time. We have not
understood the fundamentals of space and time yet, but the net result is
that light speed is C, a constant, and this fact makes this universe
possible to exist.
a*****y
发帖数: 33185
8
Flipping the Switch: Who Is Responsible for Getting Employees to Take a
Break?
It is quitting time, and you know the drill. You grab your coat and slip on
your Bluetooth for a quick call with a client on the commute home. You stop
at the grocery store and, while you are in line, pluck out your BlackBerry
to respond to emails. You arrive home, sit down to dinner and try hard to
resist the flashing red light on your smartphone. Dinner is done: Time to
check your email again, clear the dishes, and ... 阅读全帖
S*******t
发帖数: 3956
9
【 以下文字转载自 Faculty 讨论区 】
发信人: SlowRabit (慢吞吞的小白兔), 信区: Faculty
标 题: 翻译:高妹对尹希教授的专访
发信站: BBS 未名空间站 (Sat Sep 26 11:16:17 2015, 美东)
(作为年仅31岁就晋升哈佛正教授的青年才俊,尹希教授最近得到了很多关注。其中一
篇关于他的专访进入了一名同是美国大学华裔教授的女科学家的视线。因为觉得这样的
采访不过瘾,她突发奇想,想亲自采访一下尹希。于是就有了这个我们今天看到的两名
科学家之间的对话。这位女教授使用了化名,这是她出版自己几部科幻小说的笔名。对
,没错,这位女教授同时也是一个女文青,已经写了几本书,还都是英文,Amazon 就
能买到。感兴趣的不妨找来看看。很可能有一天,她也会成为传奇式的人物。那今天这
篇采访就会成为另一段佳话。)
Interview with Dr. Xi Yin

--- By Fiona Rawsontile, Sept 2015
Translated by Slow Rabbit
Thi... 阅读全帖
l*****a
发帖数: 38403
10
来自主题: TrustInJesus版 - 中国儒释道和基督教的比较
数据网上很多,自己找呗, 至于希特勒是基督徒的证据就更多了,给大师摘几段他自己
的话,请大师自己慢慢欣赏, 我奏先不奉陪了
“The anti-Semitism of the new movement (Christian Social movement)
was based on religious ideas instead of racial knowledge.”
[Adolf Hitler, "Mein Kampf", Vol. 1, Chapter 3]
“I believe today that I am acting in the sense of the Almighty
Creator. By warding off the Jews I am fighting for the Lord’s work.”
[Adolph Hitler, Speech, Reichstag, 1936]
“I have followed [the Church] in giving our party program the
character of unalterable fina... 阅读全帖
r****n
发帖数: 7315
11
来自主题: Wisdom版 - let's get bored
http://blogs.msdn.com/b/eric_brechner/archive/2009/11/01/sponta
Spontaneous combustion of rancid management
ericbrec 31 Oct 2009 11:00 PM Comments 4
What's good for you isn't always good for your group. Obvious, right? You
can call it local versus global optimization. You can get geek philosophical
about it and say, "The needs of the many outweigh the needs of the few…or
the one." Or you can simply notice the difference you feel between zany
ideas from the intern (cool) versus zany ideas from yo... 阅读全帖
x*r
发帖数: 11073
12
Social Science:
The Benefits of Multilingualism
Jared Diamond
Geography Department, University of California Los Angeles, Los Angeles, CA
90095-1524, USA.
E-mail: j******[email protected]
Multilingualism—the ability to understand and speak several languages—is
exceptional in the United States but common elsewhere, especially in small-
scale traditional societies. For instance, once while I was camped with some
New Guinea Highlanders conversing simultaneously in several local languages
, I asked ea... 阅读全帖
f****n
发帖数: 208
13
来自主题: Java版 - 问个Object.hashCode()的问题
Let me guess what the interviewer want to know one by one:
1) It's java convention that if you override equals method, you should also
override hashcode method. In real situation, it is always true. Otherwise
you don't override either.
2) I think the default hash function should give memory address instead of
constant, because it is much more efficient. So default equals and hashcode
compare the same thing.
3) Constant returned hashcode method is OK (compliable), but actually not a good choice. ... 阅读全帖
f*******n
发帖数: 12623
14
来自主题: Java版 - static final的问题
http://docs.oracle.com/javase/specs/jls/se7/html/jls-8.html#jls
Inner classes may not declare static members, unless they are constant
variables (§4.12.4), or a compile-time error occurs.
http://docs.oracle.com/javase/specs/jls/se7/html/jls-4.html#jls
A variable of primitive type or type String, that is final and initialized
with a compile-time constant expression (§15.28), is called a constant
variable.
w**z
发帖数: 8232
15
来自主题: Java版 - Google Java coding standard
Yep, Google's got standards when it comes to Java coding, and they've been
carefully documented for your enlightenment. While these enforceable coding
conventions are clearly most relevant to Java developers interested in
joining the Googleplex, they're also a good indicator of what you might
expect to see in other shops. InfoQ's Bienvenido David lists some of the
rules gleaned from the Google Java Style guide:
No wildcard imports.
Overloads appear sequentially.
Braces are used even when the bod... 阅读全帖
w**z
发帖数: 8232
16
来自主题: Java版 - Google Java coding standard
Yep, Google's got standards when it comes to Java coding, and they've been
carefully documented for your enlightenment. While these enforceable coding
conventions are clearly most relevant to Java developers interested in
joining the Googleplex, they're also a good indicator of what you might
expect to see in other shops. InfoQ's Bienvenido David lists some of the
rules gleaned from the Google Java Style guide:
No wildcard imports.
Overloads appear sequentially.
Braces are used even when the bod... 阅读全帖
f*n
发帖数: 254
17
来自主题: Java版 - Core Java那两本砖头书太浅了
谢谢推荐。这本书最新的第四版也是07年的,刚查了一下string constant pool,还是
不详细,比如intern(),全书仅仅在一处出现,只有一句话介绍:Produces one and
only one String reference per unique character sequence.
我比较孤陋,看过的最清楚的介绍string constant pool的文字,居然是一篇刚出来的
博客:http://techcypher.blogspot.in/2014/05/string-constant-pool-in-java.html
觉得很不甘心,总觉得应该有一本经典的书把底层的东西讲清楚吧。
class loader,TIJ讲得稍微多了一点点,但是JVM最基本的几个class loader都没有提
到,也没有讲到这几个loader载入的是哪些jar文件。
其实thinking in C++颇讲了一些底层的东西,十多年前看的时候觉得不错,后来好像
发现有一些小错误,具体细节记不清了。TIJ确实也是一本经典,偏偏我想找的这两个
内容都不尽人意。
t****t
发帖数: 6806
18
来自主题: Programming版 - template metaprogramming 的问题
first thing you need to know:
(non-type, non-template> template parameter must be either (integral)
constant, or some object with external linkage. In other words, it must be
either constant value, or has constant address, at least (string literals
are exception, they are not allowed). So it is not possible to have a
template with auto variable as parameter.
second, std::valarray does not allow size parameter.
w***y
发帖数: 78
19
来自主题: Programming版 - Any better way to declare a function?
If your func modifies the content of the string, then it is incorrect to
provide a constant default parameter.
If your func does not modify the content of the string, then it doesn't hurt
to declare the parameter as constant. Your func will still happily accept a
non-constant char *.
t****t
发帖数: 6806
20
error C2143: syntax error : missing ')' before 'constant'
error C2143: syntax error : missing ';' before 'constant'
error C2059: syntax error : ')'
error C2238: unexpected token(s) preceding ';'
I don't see symbol "constant" anywhere. which line is the error message
refering to?

s1,
X****r
发帖数: 3557
21
来自主题: Programming版 - in-class static member question
9.4.2 Static data members
2 The declaration of a static data member in its class
definition is not a definition and may be of an incomplete
type other than cv-qualified void. A definition shall be
provided for the static data member if it is used in the
program.
...
4 If a static data member is of const integral or const
enumeration type, its declaration in the class definition
can specify a constant-initializer which shall be an
integral constant expression. In that case, the m... 阅读全帖
s****s
发帖数: 50
22
来自主题: Programming版 - 最新某公司onsite面试题 (转载)
C++ Faq:
[18.5] What's the difference between "Fred const* p", "Fred* const p" and "F
red const* const p"?
You have to read pointer declarations right-to-left.
Fred const* p means "p points to a constant Fred": the Fred object can't be
changed via p.
Fred* const p means "p is a const pointer to a Fred": you can't change the p
ointer p, but you can change the Fred object via p.
Fred const* const p means "p is a constant pointer to a constant Fred": you
can't change the pointer p itself, nor can y... 阅读全帖
f*******n
发帖数: 12623
23
来自主题: Programming版 - const reference in copy constructor
He is wrong.
References are always constant. You cannot make a reference point to
something else after it is defined.
Even for pointers, the syntax "const A *rhs" or "A const *rhs" means pointer
to constant object. Only "A *const rhs" means "constant pointer".
w**z
发帖数: 8232
24
来自主题: Programming版 - Google Java coding standard (转载)
【 以下文字转载自 Java 讨论区 】
发信人: wwzz (一辈子当码工), 信区: Java
标 题: Google Java coding standard
发信站: BBS 未名空间站 (Thu Feb 27 18:24:40 2014, 美东)
Yep, Google's got standards when it comes to Java coding, and they've been
carefully documented for your enlightenment. While these enforceable coding
conventions are clearly most relevant to Java developers interested in
joining the Googleplex, they're also a good indicator of what you might
expect to see in other shops. InfoQ's Bienvenido David lists some of the
rul... 阅读全帖
z****e
发帖数: 54598
25
February 22, 2015 Nicole Hemsoth
art2
If you haven’t heard of Flink until now, get ready for the deluge. As one
of a stream of Apache incubator-to-top-level projects turned commercial
effort, the data processing engine’s promise is to deliver near-real time
handling of data analytics in a much faster, more condensed, and memory-
aware way than Hadoop or its in-memory predecessor, Spark, could do.
What really captured our attention, however, was the claim by Data Artisans,
the company behind Flin... 阅读全帖
s*****r
发帖数: 40
26
来自主题: Accounting版 - 求助 有一道FAR 弄不懂
题目如下
During a period of inflation, the specific price of a parcel of land
increased at a lower rate than the consumer price index. The accounting
method that would measure the land at the highest amount is
a. Historical cost/ nominal dollar
b. Current cost/nominal dollar
C. Current cost/constant dollar
D.Historical cost/constant dollar
The answer is D, Historical cost/constant dollar.
The explanation from Becker is accounting is based on historical cost which
is then adjusted for inflation
f****s
发帖数: 236
27
我在复习far是有个问题困扰很久,关于historical cost, current cost, nominal
dollar, constant dollar。
四种方法分别是:
historic cost / nominal dollar(HCND)
historic cost / constant dollar (HCCD)
current cost / nominal dollar (CCND)
current cost / constant dollar (CCCD)
主要不理解CCCD的意义。举例说明:
假设1oz黄金
- 1980 price $500
- 2010 price $1000
- 1980 - 2010 CPI = 2.5
那么用四种方法的结果是:
HCND = $500
HCCD = $500*2.5 = $1250 (?)
CCND = $1000
CCCD = ??? (也是$1000么?能否解释实际意义?)
请指正。多谢。
n***y
发帖数: 1675
28
来自主题: Accounting版 - 推荐一篇老美写的关于四大的内幕
What to Know About the Big Four Before Accepting an Offer
by Barrett Brooks• Posted inBlog, Business & Careers
原文链接如下:
http://livingformonday.com/business-and-careers/big-four-basics
It’s finally time to apply for a job (or maybe even to accept/decline an
offer) or make a career change – something you’ve been looking forward to
for a long time. Your background or major in accounting, finance, or
economics has prepared you with a desirable skillset and a valuable degree.
It’s decision time ... 阅读全帖
U******u
发帖数: 5829
29
来自主题: Biology版 - 力刀新年贺词: 为CMG服务
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
l**********1
发帖数: 5204
30
来自主题: Biology版 - 第一作者相同贡献人数无限制
人家各做一个residue 3D
Molecular Modeling 的话 还是可能的
//www.ncbi.nlm.nih.gov/pubmed/22448988
Crystal structures of Bcl-xL with 118 (PDB entry 2YXJ) and 4 were used to
model the binding poses of our designed compounds with Bcl-xL. In the
binding models, the structure of Bcl-xL in complex with 4 was superimposed
on that of Bcl-xL in complex with 1. The core scaffold of 4 then replaced
the 4′-chloro-2-methyl-1,1′-biphenyl group of 1 to generate the initial
binding model, which was then refined by a 1 ns mo... 阅读全帖
n**e
发帖数: 2026
31
同意,这是权威解释。前一段在这里;
The major hurdle that must be overcome in the development of new inbred
strains from wild populations is inbreeding depression which occurs most
strongly between the F2 and F8 generations. The cause of this depression is
the load of deleterious recessive alleles that are present in the genomes of
wild mice as well as all other animal species. These deleterious alleles
are constantly generated at a low rate by spontaneous mutation but their
number is normally held in check by th... 阅读全帖
O******e
发帖数: 4845
32
我推荐大家都读一下这篇文章:
http://www.pnas.org/content/111/16/5773.full
全文:
By Bruce Alberts, Marc W. Kirschner, Shirley Tilghman, and Harold Varmus
By many measures, the biological and medical sciences are in a golden age.
That fact, which we celebrate, makes it all the more difficult to
acknowledge that the current system contains systemic flaws that are
threatening its future. A central flaw is the long-held assumption that the
enterprise will constantly expand. As a result, there is now a severe
imbalan... 阅读全帖
v**********m
发帖数: 5516
33
来自主题: Biology版 - 联邦劳工统计局的报告
http://www.bls.gov/opub/mlr/2015/article/stem-crisis-or-stem-su
US Department of Labor
A to Z Index|FAQs|About BLS|
Contact Us
U.S. Bureau of Labor Statistics
Follow Us|What's New|Release Calendar|Site
Map
HomeSubjectsData ToolsPublicationsEconomic ReleasesStudentsBeta
HOMEARCHIVESFOR AUTHORSABOUT
ARTICLE
MAY 2015
STEM crisis or STEM surplus? Yes and yes
The last decade has seen considerable concern regarding a shortage of
science, technology, engineering, and mathematics (STEM) workers to meet ... 阅读全帖
s**d
发帖数: 5
34
来自主题: Chemistry版 - paper help (Molecular Physics)
1:Ab initio calculation of force constants and equilibrium
geometries in polyatomic molecules I. Theory
link: http://dx.doi.org/10.1080/00268976900100941
2: Ab initio calculation of force constants and equilibrium
geometries in polyatomic molecules II. Force constants of water
link: http://dx.doi.org/10.1080/00268977000100541
Email: d*****[email protected]
Thanks.
v**p
发帖数: 78
35
来自主题: Chemistry版 - PAPER HELP with link
Molecular Physics
Title: A comparison of constant energy, constant temperature and constant
pressure ensembles in molecular
dynamics simulations of atomic liquids
Link:
http://www.informaworld.com/smpp/content~db=all~content=a750926854~frm=titlelink
Thanks in advance.
b******s
发帖数: 325
36
新手急需要帮助解释下REGRESSION COEFFICIENT.谢谢帮忙先!!!
Model:
Dependent var: Delta Y (which is the outcome change between baseline and a
follow-up measurement point)
Indepdent vars: baseline score category 1, baseline score category 2 (NOTE:
category 3 is the omitted category), plus a bunch of "state" dummies (VA, IN
, MD with MS as the ommited category) and a "treatment model" dummy (where 1
= diversion; 0, transition).
QUESTION 1:
So the constant is interpreted as "the average outcome change for population... 阅读全帖
w*****1
发帖数: 473
37
来自主题: Economics版 - a question about SAS (转载)
【 以下文字转载自 Statistics 讨论区 】
发信人: wz99331 (dotti), 信区: Statistics
标 题: a question about SAS
发信站: BBS 未名空间站 (Mon Apr 2 12:52:18 2012, 美东)
我需要用MACRO 语言,用DO LOOP 改变一个模版的5个固定参数创建一些新的DATA,检
测这些新的DATA最大似然值.下面是我的CODE, 但是不能运行,大家能否帮我看看?包子
酬谢!
data parents; set csgl.individs;
keep i QTP pedid dgeno;
if i <=2;
run;
/* Do loops for grid search */
/*Y=g+R(mixed model), where g=Major Gene(latent fixed effect)with 3
values: mudaa, mudab, mudbb and R = Residual(variance component)*/
/*the max, min, and std w... 阅读全帖
f*****0
发帖数: 489
38
来自主题: EE版 - 请教:bandgap的一个问题
"3. 如果我们有一个constant current source, 那它肯定不应该随温度,power
source 变化而变化,对吧。总之,就应该总是constant, 对吧?"
since you continue to be challenged by the simple notion that what's
constant is relative, could you please allow me to help?
here is a simple link to an article by Nelson Pass (whom you undoubtedly
have never had the fortune to hear but it surfaces to say that he commands
much more authority than you do on anything electronics) on opamps.
http://www.passdiy.com/pdf/diyopamp.pdf
later in the article, Pass
t*****k
发帖数: 390
39
来自主题: EE版 - 问一个面试问题?
两个Flipflop FF1, FF2的clock signal用同一个mux 驱动, mux的0,1端连着两个不同
的clock signal,FF1的output和FF2的Data input中间是用一个combinational circui
t连接起来,现在做3个simulation run:
第一个run: mux的select signal 是constant 0
第二个run: mux的select signal 是constant 1
第三个run: mux的select signal 是constant x
这3个run出来的结果有什么不同? thanks
w********o
发帖数: 10088
40
来自主题: EE版 - 请教一下做Si的朋友
谢谢
是ldmos里面填trench的dielectrics,一个trench填不通dielectric constant的材料
paper里面没说是啥材料,纯simulation的,但是我觉得这constant值取得挺扯的,从1
取到6,每层加1
low dielectric的constant怎么调啊?

k=
l********0
发帖数: 372
41
来自主题: EE版 - semiconductor dielectric问题
有道理。这就是理论和应用的差异。
其实现在我们更倾向于说permittivity,而不是dielectric constant,因为介电率并
不是一个constant,它随温、湿度,电压,气压等条件变化。dielectric constant只
是一个历史习惯称呼。
以SiN为例,不同条件下得到的只是Si(x)N(y), x,y随制备条件的变化而变化,所得到
的产物的permittivity当然也不同。其实对材料而言,是没有perefect,纯净的。还以
Si3N4为例,如果用PECVD生成,即使你设计了完美前驱物比例,在气象前驱物混合之初
和depostion快结束的不同阶段肯定生成物的defects的种类和数目都不同,其产物的
permittivity就会不同 -- 实际上最终所得产物是由各个permittivity不同的产物层叠
加而成。
想实际测量1-5nm的thin film的capacitance还是有办法的,如果你再有defects的种类
和数量的数据,你就可以建立模型了。如果想模拟纯净材料的permittivity,可以从分
子结构,电负性进行计算,这都有现成的模型。p... 阅读全帖
A******a
发帖数: 143
42
第一个公式里面应该是effective dielectric constant, 这个是和介质本身的
constant以及Tline的geometry相关, 也就是和LC相关。
[在 garu (garu) 的大作中提到:]
:一对stripline的印制板传输线,信号的传输速度应该是c(speed of light)/root(
:dielectric constant),今天看传输线理论,有看到说速度是c/root(L*C), L and C
:...........
c*v
发帖数: 53
43
One old news in 2009.
http://www.treehugger.com/files/2009/02/china-birth-defects-pol
by Alex Pasternack, New York, NY on 02. 2.09
china newborn infant pollution birth defects photo
We know that China's pollution isn't good for its newborns. Recently, a
government official announced that birth defects are "constantly increasing,
" and that every 30 seconds, a baby is born with physical defects in China.
The statistic isn't new. But the official made clear something the
government has long been r... 阅读全帖
q**j
发帖数: 10612
44
choose x to
min a'x
subject to: x'Ax=c and x>=0.
这里 a is a constant vector, A is a constant positive definite matrix, c is
a positive constant. x is a non-negative vector。
请各位数学大侠帮忙!多谢了。
s*****e
发帖数: 115
45
Not so familiar with the Green's function approach, so I cannot comment on that.
However, I believe your conjecture is true for the following reasons:
What you want to prove is equivalent to that if the eigenfunctions are normalized with respect to sup-norm then their L2 norms are always bounded away from zero.
Clearly, this not true for general functions. For example, both exp(-kt) and exp(-k)*exp(kt) (k>0) on [0,1] have L2 norms approaching to zero as k-->+ infinity. On the other hand, one can... 阅读全帖
x********y
发帖数: 189
46
来自主题: Mathematics版 - Can anyone help with this problem?
Again, how can a cdf's support be [constant,constant]???
The definition of a cfd is F(x)=P(X less or equal x), i.e. F(infinity)=1!!!
Anyway, I can guess what you meant, your "support" is actually the non-
constant part.
The result you want to claim is not right! A counterexample would be
F1(t)=delta_0(t)
F2(t)=1/2 delta_0(t)+ 1/2 delta_c(t)
Wisely choose a small c in order to make your b<0 and b+c<0.
J********1
发帖数: 66
47
来自主题: MedicalCareer版 - CS考经
 First Sight on door-way information.
 Knock 3 times with confidence, a smile, walk in and say:
INTRODUCTION:
 Hello, Mr/Ms ------- , I am Dr.xxx,the physician on duty
today.
 Nice to meet you. (Shake hands only if the pt wants to. Don’t
shake hands with SPs in severe pain).
 Is everything in the room all right for you?
 Let me make you a little more comfortable. (open up the drape ..
.OPEN IT COMPLETELY... cover the legs in t... 阅读全帖
w*****1
发帖数: 473
48
来自主题: Pharmacy版 - a question about SAS (转载)
【 以下文字转载自 Statistics 讨论区 】
发信人: wz99331 (dotti), 信区: Statistics
标 题: a question about SAS
发信站: BBS 未名空间站 (Mon Apr 2 12:52:18 2012, 美东)
我需要用MACRO 语言,用DO LOOP 改变一个模版的5个固定参数创建一些新的DATA,检
测这些新的DATA最大似然值.下面是我的CODE, 但是不能运行,大家能否帮我看看?包子
酬谢!
data parents; set csgl.individs;
keep i QTP pedid dgeno;
if i <=2;
run;
/* Do loops for grid search */
/*Y=g+R(mixed model), where g=Major Gene(latent fixed effect)with 3
values: mudaa, mudab, mudbb and R = Residual(variance component)*/
/*the max, min, and std w... 阅读全帖
m****p
发帖数: 404
49
来自主题: Pharmacy版 - 想自己开店的看过来
sdn 上看到的 很多信息
http://forums.studentdoctor.net/index.php?threads/my-pharm-star
全文转载如下
-------------------------
I thought it would be helpful (or entertaining) for anyone interested in
owning an independent pharmacy or looking to start a new one to follow along
with me as I work to re-open a store starting from scratch with no retail/
independent experience. The store is in Florida. I will try and highlight
things I learned that I had never been exposed to before. Please feel free
to offer advic... 阅读全帖
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