i**********d
发帖数: 853 | 1 Shine11 Talk Note (04082012)
1. Learn how to talk with stranger;
2. Try to make friends in your daily life;
3. Know what happens everyday;
4. Read USAnews on ipod;
5. Dress formally in observation;
6. Be honest and keep your promise;
7. Try to get help from everybody in observation, e.g. medical student;
8. Get good information from nurses and other people;
9. Give other people a good first impression;
10. Try to follow a good attending for a long time;
11. Make ... 阅读全帖 |
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o****p
发帖数: 25 | 2 现在开始接受 OB/Extern program （2013 – 2014） 申请。
ACAP Observation/Externship program 2013 - 2014
The application is for the OB/Extern program from June 2013 to May 2014. We
will not accept any OB application after deadline.
Application deadline: May. 19, 2013
Program start: June 1st, 2013
The rotation block will be 4 weeks.
In-patient Hospitals: NYHQ- New York Hospital Queens, BIMC- Beth Israel
Medical center, Lutheran Medical center, Flushing hospital Medical center
Specialities : IM, ER, Surgery, OB... 阅读全帖 |
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o****p
发帖数: 25 | 3 现在开始接受 OB/Extern program （2013 – 2014） 申请。
ACAP Observation/Externship program 2013 - 2014
The application is for the OB/Extern program from June 2013 to May 2014. We
will not accept any OB application after deadline.
Application deadline: May. 19, 2013
Program start: June 1st, 2013
The rotation block will be 4 weeks.
In-patient Hospitals: NYHQ- New York Hospital Queens, BIMC- Beth Israel
Medical center, Lutheran Medical center, Flushing hospital Medical center
Specialities : IM, ER, Surgery, OB... 阅读全帖 |
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M********D
发帖数: 4 | 4 I previously posted pathology observership opportunity and received
overwhelming responses....Now I'd like to hire a part-time lab manager who
can help run lab while observing.
Requirement:
1. At least 5-year research experience in USA
2. Hand-on experience in biochemistry(skills in ubquitination and cell
cylces are huge plus. in vitro study only. no mouse work)
3. Excellent written English evidenced by 1st author publications in English
journals
4. At least 5-month of commitment and available A... 阅读全帖 |
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d******d
发帖数: 121 | 5 以前有前辈写过在Queens的体验，我学习到很多。昨天在ACAP听到大家对如何在
NYHQ做OB还有一些问题，所以希望写下自己的经历，对后来人有所帮助。
首先非常感谢ACAP的帮助，让我们在NYHQ能一直有机会。我来到NYHQ医院做了一个
月的OB. 虽然知道这个机会来之不易而且还有很多XDJM在报名排队，我在来之前还是有
些犹豫。因为可以在我所在的城市里的教学医院做OB，为什么要离开家人和工作，来到
一个社区医院做呢？其实来到第一天的见闻就打消了我所有的顾虑，一个月确实挺值的
，只是没有机会再做长一些时间。
NYHQ位于法拉盛区（Flushing），医院大厅标注着英文、中文、韩文、俄文等等，
足可以看出医院的多元化（diversity）。第一天先参加orientation和infectious
control training， 然后去街对面GME办公室递交application form等paperwork，再
回到医院办理ID卡，到五楼找chief resident报道。一批observer一般有四人， 两周
在CCU或MICU，两周在内科Floor。稍有... 阅读全帖 |
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g****g
发帖数: 1828 | 6 What is direct CP violation?
By Davide Castelvecchi
Direct and indirect CP violation are two mechanisms that break the symmetry
between the behavior of matter and anti-matter. The BaBar experiment first
discovered indirect CP violation for B and anti-B (or B-bar) mesons in 2001.
BaBar’s new result is the first observation of direct CP violation for B/
anti-B mesons.
The BaBar Detector at SLAC. (Photo by Peter Ginter)
Historically, physicists believed that in a mirror image of the world all
laws... 阅读全帖 |
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t**********m
发帖数: 205 | 7 既然大爆炸理论得到了梵蒂冈的认可，那么我们来分析一下：创造生命的大爆炸理论究
竟是什么东西？
上一篇博客我谈到了广义相对论是什么东西，参见
http://www.galaxyanatomy.com/
'General Relativity is very simple. It is equivalent to one sentence:
There exists one and only one local inertial reference frame at any point of
a spacetime manifold.
This is similar to the situation that
There exists one and only one local tangent plane at any point of a surface.'
上述一句话就是著名的爱因斯坦的引力等效原理。等效原理讲的就是：引力跟其它三种
相互作用力有本质的不同，引力可以通过参考标架的变换来消灭掉！
爱因斯坦是对的。我们的身体每天遭受着引力的相互作用，而且逆来顺受，已经习惯了
。如果你要... 阅读全帖 |
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q*d
发帖数: 22178 | 8 吗?
http://news.xinhuanet.com/english/world/2013-04/03/c_132283285.
AMS announces first results in search for dark matter
English.news.cn 2013-04-03 23:22:14
Samuel Ting, Chinese-American principal scientist for the Alpha Magnetic
Spectrometer (AMS) project, is interviewed at the European Organisation for
Nuclear Research's (CERN) near Geneva, April 3, 2013. The AMS team led by
Nobel laureate Samuel Ting announced on Wednesday the first results in the
search for dark matter, re... 阅读全帖 |
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a*******a
发帖数: 1240 | 9 Before embarking on a metaphysical critique of the famed "theory of general
relativity" (GR) amidst the fanfare of the recent observation by LIGO of
gravitational wave, an explorative discussion of mathematics is both helpful
and necessary.
In any theoretical investigations, mathematics plays a pivotal role. The
natural question arising herein is then, what is mathematics? And what kind
of roles can we possibly expect of mathematics in any theoretical enquiries
(i.e., by deductions) or in a prac... 阅读全帖 |
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i**w
发帖数: 71 | 10 背景:fresh physics PhD
还没offer,但年前基本上不会再折腾了。
有重复。基本上都是很标准的题。
简单的题如果人家想问倒你也是很容易的。
面试书recruiter推荐
1) Mark Joshi: "Quant Job Interviews: Questions and Answers". I have
heard very good things about this book.
2) Xinfeng Zhou, "A Practical Guide to Quantitative Finance Interviews"
个人觉得非常有用， 大部分问题都在这两本上。
算法，C++, stochastic calculus 就看比较标准的几本。
- sqrt(i)=?
- You and me roll a dice,first one gets a six wins. You roll first. what
is the probability of you winning?
- A stair of n steps. Each time you st... 阅读全帖 |
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w**********y
发帖数: 1691 | 11 多谢分享.大概做了做..欢迎补充和指正.
- sqrt(i)=?
e^{\pi/4 i} or - e^{\pi/4 i}
- You and me roll a dice,first one gets a six wins. You roll first. what
is the probability of you winning?
P(I win) = P(Y !win and I win) = 6/11
- A stair of n steps. Each time you step up 1 or 2 steps. How many
different ways are there to reach the top? what is the asymptotic limit?
Fibonacci sequence ..limF(n)/F(n-1)==x for n>2, solve x, and F(n) ~ x^{n-1}
- Moment generating function of standard model.
statistic book…
- Write a si... 阅读全帖 |
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t*******y
发帖数: 637 | 12 第二题应该是6/11吧
能讲讲这个吗? - X1 and X2 are independent random variable with pdf f and g.
what is what is the pdf of X=X1+X2
Jacobian matrix for X1+X2 and X1-X2..
多谢分享.大概做了做..欢迎补充和指正.
- sqrt(i)=?
e^{\pi/4 i} or - e^{\pi/4 i}
- You and me roll a dice,first one gets a six wins. You roll first. what
is the probability of you winning?
P(I win) = P(Y !win and I win) = 5/6*1/6
- A stair of n steps. Each time you step up 1 or 2 steps. How many
different ways are there to reach the top? what is the asymptotic... 阅读全帖 |
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o******6
发帖数: 538 | 13 ☆─────────────────────────────────────☆
siemenxu (simon) 于 (Mon Jul 6 17:39:36 2009, 美东) 提到:
有 一个data set, 总共有 N observations, 有4个group, 每个group 大概有30个左右的
observations, 每个observation 有2个variables( one is binary(1 or 0), the
other is continuous),怎样把这个data set 读入一个3-dim array 里面 呢?
(eg. xij1, xij2, i=1,2,3,4 representing the group, j=1,...ni # of
observations for each group, 1,2 是标注那两个variables )
谢谢了:)
☆─────────────────────────────────────☆
OMalley (Lost) 于 (Mon Jul 6 18:15:23 2009, 美 |
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o******6
发帖数: 538 | 14 ☆─────────────────────────────────────☆
strongbull (junina) 于 (Mon Mar 16 14:39:12 2009) 提到:
小女子初学SAS,遇到一个难题，请版上牛人不吝赐教
数据形式 为 ID Date Value
我想对每条记录进行如下操作
对observation N: 以它的date 为中心， 前后各一天，定义一个三天的event window
比如date=2000/02/19 then event window is 2000/02/18, 2000/02/19, 2000/02/20
对于data set 其他的observation 也进行同样操作， 比方说observation N-1 吧，如果
基于这两个observation 的3-day event windows 日期有重合， 比如N-1 的 date 是
2000/02/17 (event window=2000/02/16,2000/02/17 2000/02/18; 可见2000/02/18是
重合的）那么把这两条记录都删除
对我而 |
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y****1
发帖数: 400 | 15 I have a large SAS data set (result) with 1599000 observations. It's
actually 1000 replicates of a single file with 1599 observations. Now I
want to output every 1599 observations to a separate data set (result1 -
result1000):
data result1-result1000;
set result;
do i=1 to 1000;
if (i-1)*1599<_N_=
end;
run;
How should I specify the data set that the observations should be written
to? I tried result||'i' but it did not work~
Thank you so much!!!! |
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l**********s
发帖数: 255 | 16 有以下的一组数据data one（真实数据有上百个变量和上千个observation，用data
one做例子为了能方便描述自己的问题），如果一个observation从a1到a5的所有值都是
0，想把他成"."，最后得到如同data two的数据。
我现在想到的方法有二种，方法一就是先把所有从a1到a5的observation的ID找出来，
然后根据ID来recode data。这样虽然可以达到目的，但是比较笨,而且在找id的过程中
容易出错。
方法一的code在后面。
方法二就是用"if ....then..."，把符合条件，也就是a1=0 and a2=0 and a3=0 and
a4=0 and a5=0的observations从"0"成"."，但是好像我的code不成功，不知道那位能
帮我找出为什么。
而且就算我的方法二没有问题，因为实际数据很大，code也会很长，是不是要用macro
或array？哪位高人能指点下？多谢多谢！
data one;
input ID a1 a2 a3 a4 a5;
datalies;
1 0 0 0 0 0
2 0 0 0 0 0
3 0 |
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k*******a
发帖数: 772 | 17 it depends, sample size larger, the more likely you will observe outlier.
you can calculate the probability you observe the outlier, and set a cutoff
to decide whether delete or not.
if the p is p-value to observe the outlier, then the probability of
observing one outlier at size n is approximately np, if np is still small,
then you can delete otherwise, think twice, I think |
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D*D
发帖数: 236 | 18 for large dataset and exact number of samples the following is an example
from the SAS advanced certificate guide of the fastest algorithm to serve
that purpose
much faster than proc surveyselct
data work.rsubset(drop=obsleft sampsize);
sampsize=100;
obsleft=totobs;
do while(sampsize>0);
pickit+1;
if ranuni(0)
set sasuser.revenue point=pickit
nobs=totobs;
output;
sampsize=sampsize-1;
end;
obsleft=obsleft... 阅读全帖 |
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l*********g
发帖数: 177 | 19 但是每次循环的时候不是都是先运行lagV=lag(V)么？关于这个step我的目前理解是sas
应该是把上一次循环算出的V赋值给lagV吧。而因为我在code中有这么一句
if lagPortID ne PortID then lagV=1;
就能保证每个PortID group的第一个observation的lagV能被赋值为1，从而第一个
observation的V就能算出来而并非missing。这样从每个PortID group的第二个
observation开始就照理都能通过运行lagV=lag(V)得到非missisng的lagV啊，因为前一
次observation的V都是有值，而非missing啊。
请高人指教我这儿是哪里想错了啊？是不是和sas运行lag（。）语句和其他语句的顺序
有关啊？
先谢谢了哦！！ |
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o****n
发帖数: 281 | 20 有个问题一直没有想明白，请大仙们帮助：
the following SAS program is submitted:
data work.empsalary;
set work.people(in = inemp)
work.money(in = insal);
if insal and inemp;
run;
The SAS dataset work.people has 5 observations, and the dataset work.money
has 7 observations. How many observations will the dataset work.empsalary
contain?
答案是0，我想如果people和money这两个datasets有共同的observations，结果应该是
一个非零的数（不大于5）对吧？是说一定要有一个by statement才行？ |
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T*******I
发帖数: 5138 | 21 请问，以下对Bootstrapping法的描述是正确的吗？
In statistics, bootstrapping is a computer-based method for assigning
measures of accuracy to sample estimates (Efron and Tibshirani 1994). This
technique allows estimation of the sample distribution of almost any
statistic using only very simple methods (Varian 2005).[1] Generally, it
falls in the broader class of resampling methods.
Bootstrapping is the practice of estimating properties of an estimator (such
as its variance) by measuring those properties when samp... 阅读全帖 |
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d********1
发帖数: 188 | 22 data towns;
input City $ pop year;
cards;
ANDOVER 75000 1998
CARY 80000 1998
ANDOVER 14000 1977
CARY 71000 1986
;
%macro a(location);
data a;
set towns;
%if &location=UK %then %do;
where city='ANDOVER';
%end;
%if &location=NC %then %do;
where city='CARY';
%end;
if pop>70000;
run;
%mend;
%a(UK)
Which one of the following represents the resulting output in the SAS data
set A?
a. 1 observation with the value of CARY for the variable City
b. 2 observations with the value of CARY for the variable Cit... 阅读全帖 |
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p***7
发帖数: 535 | 23 35
given the SAS DATA set SASDATA.TWO
X Y
-----
5 2
3 1
5 6
The program below is submitted
data sasuser.one sasuser.two other;
if x eq 5 then output sasuser.one;
if y lt 5 then output sasuser.two;
output;
run;
The answer is
A
sasuser.one has 5 observations
sasuser.two has 5 observations
work.other has 3 observations
Where is 5 observations from? total it is 3.
Thanks |
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D**u
发帖数: 288 | 24 明白你的意思了，确实第二题跟第三题是不同的，不能解释成test association了。不
过这个恰好是另外一种Chi-square test，叫作goodness of fit test. test的结论就
是，either observation 是来自 Ber(0.5) proportion 是 0.5，或者observation不
是来自 ber(0.5). 其实没有什么本质上的不同，只不过一个是 observed + expected
，另一个两个都是observed. |
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n****t
发帖数: 182 | 25 Before the experiment, Bayesian statisticians think about the “prior odds”
, Pr(H1)/Pr(H0), where Pr(H1) is the probability of H1 is true, and Pr(H0)
is the probability of H0 is true.
Frequentist, on the other hand, does not think that way: there is only one
simple truth, H0 is true or H1 is true.
After experiment, Bayesians gain Pr(H1/Data)/Pr(H0/Data), the so called
posterior odds.
Bayesian factor (bf)=Posterior odds/Prior odds. Bayesians use this for
hypothesis testing. (Another interesting ... 阅读全帖 |
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g*********n
发帖数: 119 | 26 An introduction of AdaBoost/AdaCost algorithm, and a metaphor for life
(slides我就不贴这里了)
Today I gave my co-data-scientists at Kingstowne office a presentation of
the introduction of AdaCost. The feedback is surprisingly well so that I
think it might be a good idea to highlight some interesting thoughts in a
blog post to share with larger audience. The full deck of slides is attached
on the post.
The purpose of the presentation was to describe a classification algorithm,
which could be boring by n... 阅读全帖 |
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w****2
发帖数: 12072 | 27 【 以下文字转载自 Military 讨论区 】
发信人: wlwl12 (戒网), 信区: Military
标 题: 锡安长老教义(整理贴)
发信站: BBS 未名空间站 (Tue Dec 20 12:09:32 2011, 美东)
发信人: youdu (youdu), 信区: Military
标 题: 军版各位，有没有研究过锡安长老教义？
发信站: BBS 未名空间站 (Sat Nov 26 13:15:49 2011, 美东)
对理解过去三百年很有帮助。
http://www.biblebelievers.org.au/przion1.htm#TABLE OF CONTENTS
THE PROTOCOLS DIGEST-ED
Since discourse in the Protocols is often disjointed, we have taken the
liberty of grouping quotations (from Victor Marsden's 1934 edition) in what
seems a logical order of su... 阅读全帖 |
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k*****y
发帖数: 2069 | 28 【 以下文字转载自 Parenting 讨论区 】
发信人: ashuang (东洛杉矶推妈+股票大妈), 信区: Parenting
标 题: 一位优秀的犹太写作辅导老师
发信站: BBS 未名空间站 (Sun Jan 30 23:28:07 2011, 美东)
洛杉矶
我小孩6年级了, 十分热爱写作, 在电脑前一呆就是好几个小时, 随便就是10 几页的长
篇大作, 但学校的英文成绩却很不理想, 经常是A-, 有时还是B. 我读过她的文章，觉
得就是我们老师说的流水帐,为了改变这种状况,也为了她在写作方面有所发展， 3个月
前我在CRAIGSLIST.ORG登了个广告, 以每小时20元的价格聘请老师, 结果应聘的电子
邮件来了将近 上百份(在美国学文真不容易), 其中很多人的背景都很强, 名校毕业,
大学文学课教授, 作家,等等. 在总多的简历当中,其中一人的电子邮件让其他人的电邮
黯然失色(以下付上邮件), 我决定就是他了. 老师是50多岁年纪的犹太人, 毕业于纽约
大学的电影系, 现在在洛杉矶做一些SCREEN PLAYING的 工作, 我每个星期六带女儿到
El monte... 阅读全帖 |
|
l****i
发帖数: 617 | 29 来自主题: _PathToTruth版 - 报告模板 我刚才仔细读了一遍我们的对话。上次我把很多精力放在语言本身，所以理解力大打折
扣。
这次全看懂了。
我自作主张贴部分。
keep watching yourself what u r doing
and why ur doing it
im talking about realtime observation
otherwise we may rush into false conclusion without clear observation
now u r unable to do this kind of realtime observation
so wat u can do is slow down
dont rush
otherwise we may rush into false conclusion without clear observation
your ability of LIAN XIANG is too strong
slow down and dont lose alertness is my suggestion
dont analyse just |
|
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o**o
发帖数: 21 | 31 关于《大宪章》
打个不算特别恰当但是比较好理解的比方，假设我们从中国乘飞机飞往美国－－飞
到关岛了，这的确是美国，但是离其本土还差十万八千里呢，好比《大宪章》刚刚
颁布，离真正的法治和民主的路还任重道远；等飞到夏威夷了，这也的确是美国，
可是上面除了毛利土著、日裔华裔、海军大兵和旅游者之外，要想看看典型的美国
人恐怕还是找错了地方，这好比Simon De Montfort和Edward I时期议会刚刚试运
转，机制开始建立，模子已经越来越成型了，但还不能算货真价实；只有飞过了落
山鸡，才是真正地到了美国，好比经过了光荣革命，英国以至近代的法治和民主才
真正地落到了实处；不过实际上加州到处西裔亚裔印度裔犹太裔人士成群，其美国
味道仍然欠一点火候，还得开一阵远路四处兜兜才成，好比光荣革命后的三百年人
类的继续探索和完善补充．回头看看离着十万八千里的关岛，虽然你尽可以嘲笑那
地方如何挂羊头卖狗肉，但那是大家都不得不走过的路，也是一个明白无误昭示方
向的路标，其意义不说自明．
现在就让我们来看看《大宪章》卖的到底是什么样的狗肉，见识一下刚刚摆脱蒙... 阅读全帖 |
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f**********4
发帖数: 2617 | 32 俺确实不咋了解这工程啊。又看了一眼，那英国佬总是引用的好像不是江晓原，而是刘
次沅。然后他说的不是中国人没有考虑自转变化，而是用了“错误的”变化参数。
The rate of rotation of Earth varies over time (which affects how eclipses
are observed). This variation implies changes in the length of the day. The
sum of those changes (a function of time, here measured in centuries from
AD 1820) can be approximately modelled by a parabola. Liu et al. claim that
the parabola’s coefficient can be 28,58 and they cite Stephenson and
Morrison59 to justify this. Stephenson and Morrison an... 阅读全帖 |
|
c*****1
发帖数: 3240 | 33 ☆─────────────────────────────────────☆
dangran (当当当) 于 (Wed Aug 8 04:17:40 2012, 美东) 提到:
2012年6月，芝加哥大学东亚语文系教授夏含夷质疑“夏商周断代工程的成果报告简本发
表十年后仍无繁本，恐怕将来也不太可能发表。”
2002年“夏商周断代工程”关键数据在美国“亚洲学协会”年会被质疑“站不住脚”
中国政府在上世纪末只花了上千万人民币、只搞了五年“夏商周断代工程”，就于2000年
10月验收了“夏商周断代工程”的工作成果《夏商周断代工程1996―2000年阶段成果报告
(简本)》，并对其颁发“全国十大科学进步奖”。这个研究结果看似光鲜，但其中的数据
经不起质疑，戳破了之后“断代工程”的成员还死不认账。
2002年4月4日至7日，美国“亚洲学协会”的年会在美国华盛顿召开。会议专门邀请了“
工程”的学者来美讨论。在会议上，美方与会学者蒋祖棣以自己带去的计算机和OxCaI序
列程序当场对“工程”以同样程序处理的若干碳-14数据重新进行验算，结果明显与“工
程”的有差距。中国方面参加会议的“工... 阅读全帖 |
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g***j
发帖数: 40861 | 34 By Jerry A. Coyne
Religion in America is on the defensive.
Atheist books such as The God Delusion and The End of Faith have, by
exposing the dangers of faith and the lack of evidence for the God of
Abraham, become best-sellers. Science nibbles at religion from the other end
, relentlessly consuming divine explanations and replacing them with
material ones. Evolution took a huge bite a while back, and recent work on
the brain has shown no evidence for souls, spirits, or any part of our
personalit... 阅读全帖 |
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R****a
发帖数: 6858 | 35 空中力量澳大利亚 文章: 中国新型J20隐形战机对F35和F/A-18意味着什么.
来源: googleit 于 2010-12-31 15:09:43 [档案] [博客] 旧帖] [转至博客] [给我悄
悄话] 本文已被阅读：186次 字体：调大/调小/重置 | 加入书签 | 打印 | 所有跟帖
| 加跟贴 | 查看当前最热讨论主题 摘要:
F35基于错误的理论"飞机的机动性无关紧要,让导弹做转圈的活. "
* 第一, 假定F35能撑到可发射导弹的位置, 但是J20和T50拥有低可探测性, 又非得多
快得多, 因而使他们的下视下射导弹拥有先发制人的优势;
* 第二, 更危险的是, J20和T50有超强的应对来袭导弹的措施(包括超机动, 隐形等,超
高速,及电子对抗措施, 让F35会转圈的导弹无法得手.由于自大地认为敌人的导弹无法
穿透F35隐形技术的屏障,F35的相应应对能力要差得多.
* 第三, F35紧急应变能力原本似乎不必要的,但现在J20依仗其隐形和高速会飞快地出
现在打完导弹的F35面前,迫使它进入并不擅长的缠斗.
http://www.ausairpower.net/AP... 阅读全帖 |
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j***h
发帖数: 4412 | 36 英国规范及抄袭英国规范的澳洲、香港、马来西亚规范等等英联邦规范都没有抗震条文
。新西兰规范搞了些抗震规定，但与加州规范相比太小儿科了。周二晚有俩个新西兰
engineer要在三藩班门弄斧，偶去围观一下：
ATTENTION:
The Speakers for this event have been updated, and the topic has been
slightly revised due to recent activity in New Zealand. Deadline extended to
4 p.m. Friday.
Topic:
TWO EARTHQUAKES, ONE CITY:
SEPTEMBER 4, 2010 DARFIELD EARTHQUAKE
FEBRUARY 21, 2011 CHRISTCHURCH EARTHQUAKE
REVISED PRESENTATION:
Darfield, a small mid-Canterbury town in New Zealand, experienced a
Magnitude 7.1 earthqu... 阅读全帖 |
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w*********g
发帖数: 30882 | 37 高歌，现任北京航空航天大学能源动力学院动力工程及工程热物理学科一级责任教授，
航空发动机气动热力国防重点实验室副主任，长期从事动力工程、工程热物理及流体力
学领域的教学与科研工作，并在基础科研和多学科的应用技术领域取得了一系列国际领
先水平的创新性科研成果。
他在1984年发明的"沙丘驻涡火焰稳定器"，获国家发明一等奖，钱学森同志称之为"一
项长中国人志气的重要发明"。该成果广泛应用于我国多种军用航空发动机中，取得了
数以亿元计的经济效益，至今仍保有先进水平。本刊记者于今年10月采访了高歌教授，
了解到了他近期从事的一些前沿科研工作的最新进展，尤其是他对龙卷风的研究及其工
程应用价值，让人耳目一新。
高歌教授在采访中提到，传统的航空发动机技术虽然还在不停地改进提高之中，但
受到原理和材料工艺上的限制，已经逐渐逼近了性能发展的极限。目前虽然涌现出一些
新型航空发动机技术，但仍然没有走出依靠压力膨胀过程来实现热功转换的思路。他强
调，人们应该另辟蹊径，寻找其他可用的工作原理。为此，他研究了自然界龙卷风的形
成与强化机制，发明了一项称为"余热增推"的技术，直接利用龙卷旋涡实现热功转换并
提取... 阅读全帖 |
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G********n
发帖数: 615 | 38 http://www.spiegel.de/international/world/0[/url],1518,781597,0
SPIEGEL: Madame Fu Ying, few countries are more interesting to the West
right now than China -- and few others alarm the West to the same degree,
now that you have launched your first aircraft carrier. Why does China need
to arm itself to this extent?
Fu Ying: The first aircraft carrier going to sea is a very exciting event in
China. It's something the Chinese people longed for. People think it's a
natural step in the growth of the ... 阅读全帖 |
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c**i
发帖数: 13113 | 39 ☆─────────────────────────────────────☆
btphy (btphy) 于 (Mon Jan 30 04:35:43 2012, 美东) 提到:
一个热爱文学创作的人不可能不热衷于在创作中经常的涉及与自己其他兴趣爱好相关的
东西，这是人的本能。韩寒可能在博客里面提到一些与赛车有关的事情，不过很显然没
有什么精彩的东西，而且一向着墨不多。原因很简单，就是大韩寒不懂赛车。
☆─────────────────────────────────────☆
marclee (marc) 于 (Mon Jan 30 04:38:47 2012, 美东) 提到:
nod....
☆─────────────────────────────────────☆
bibicat (bibicat) 于 (Mon Jan 30 04:39:20 2012, 美东) 提到:
哈哈，这个好，快转给方舟子说韩寒赛车是用的替身
☆─────────────────────────────────────☆
btphy (btphy) 于 (... 阅读全帖 |
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m**p
发帖数: 2471 | 40 http://www.cnn.com/2012/09/11/world/asia/china-vice-president/i
Absence of Chinese vice president fuels intrigue before power transition
Beijing (CNN) -- The conspicuous absence from public view of China's
presumptive next top leader is adding new uncertainty to the succession plan
for the normally secretive Communist leadership.
For ten days, Vice President Xi Jinping has dropped off the radar of state-
run domestic news media, which usually meticulously record official
activities of senior lea... 阅读全帖 |
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s*****r
发帖数: 11545 | 41 虽然现在看见了，其实有可能在60亿年前就不存在了，这不是很可悲么？
http://news.yahoo.com/farthest-known-galaxy-universe-discovered
Farthest Known Galaxy in the Universe Discovered
A new celestial wonder has stolen the title of most distant object ever seen
in the universe, astronomers report.
The new record holder is the galaxy MACS0647-JD, which is about 13.3 billion
light-years away. The universe itself is only 13.7 billion years old, so
this galaxy's light has been traveling toward us for almost the whole
history of space an... 阅读全帖 |
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t******r
发帖数: 8600 | 42 Today, I want to focus my remarks on terrorism.
But first, let me address one point.
Some have suggested that by holding a Strategic Defence and Security Review,
Britain is somehow retreating from an activist role in the world.
This is the complete reversal of the truth.
Yes, we are dealing with the deficit, but we are also making sure our
defences are strong.
Britain will continue to meet the Nato 2 per cent target for defence
spending.
We still have the fourth largest military budget in the wo... 阅读全帖 |
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M******8
发帖数: 10589 | 43 http://www.raskb.com/transactions/VOL64/VOL64-3.docx
“You are Dead, the Square is Dead”: The 1989 Chinese Pro-Democracy
Movement
by Karen EGGLESTON
You are dead, the Square is dead.
They say now is a great victory,
thinking that death can protect their criminal existence.
We live on,
We give our hearts to you,the dead ones,
to let you live again through our lives,
to complete the mission which you left incomplete.
by Gu Cheng and Yang... 阅读全帖 |
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c******a
发帖数: 4400 | 44 IPCC 5th Assessment Report states:
Human Activity
Each IPCC report has been progressively stronger in attributing climate
change to human activities.
The AR5 contains the strongest statement yet, saying it is “extremely
likely” (a greater than 95 percent chance) that human activities are “the
dominant cause of the observed warming” since the 1950s.
The Third Assessment (2001) made a similar statement with approximately 66
percent certainty, while the Fourth Assessment Report (AR4) (2007) found
t... 阅读全帖 |
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c******a
发帖数: 4400 | 45 英国人怎么作假了？正经儿的你又不听。有问题的数据IPCC根本没采纳。实际上根本没
有证据证明造假，都是naysayers逮着半截就开跑，鼓噪，后来的解释不听，跟CNN报道
藏独一个德行
因为学界几乎已无争议，IPCC为了展现事物的两面性，只好cite一些根本不入流的其实
都被石油商收买的科学家的work。所以3000个科学家写的东西你可以一句话就轻描淡写
的否认了，您真牛，致敬
IPCC 5th Assessment Report states:
Human Activity
Each IPCC report has been progressively stronger in attributing climate
change to human activities.
The AR5 contains the strongest statement yet, saying it is “extremely
likely” (a greater than 95 percent chance) that human activities are “the
dominant cause ... 阅读全帖 |
|
c******a
发帖数: 4400 | 46 历史有这趋势，现在不一定是同样的趋势，人类对地球的影响是史无前例的，
overwhelming的，以前有那种动物能把地下存了上千万年的石油燃烧了？谁能把地下两
迈深的石头里面存的气体抽出来烧掉？前10年的研究就是搞明白了这个问题，所以现在
敢下断言了
Each IPCC report has been progressively stronger in attributing climate
change to human activities.
The AR5 contains the strongest statement yet, saying it is “extremely
likely” (a greater than 95 percent chance) that human activities are “the
dominant cause of the observed warming” since the 1950s.
The Third Assessment (2001) made a similar statement with approximately 6... 阅读全帖 |
|
w********t
发帖数: 12853 | 47 Science 22 August 2014:
Vol. 345 no. 6199
DOI: 10.1126/science.1251722
RESEARCH ARTICLE
Reverse-engineering censorship in China: Randomized experimentation and
participant observation
Gary King1,*, Jennifer Pan1, Margaret E. Roberts2
+ Author Affiliations
1Institute for Quantitative Social Science, Harvard University, Cambridge,
MA 02138, USA.
2Department of Political Science, University of California, San Diego, La
Jolla, CA 92093, USA.
↵*Corresponding author. E-mail: [email protected]
(f... 阅读全帖 |
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r*****1
发帖数: 3465 | 48 Five Chinese Navy Ships Are Operating in Bering Sea Off Alaska Coast
http://www.wsj.com/articles/pentagon-watches-as-chinese-navy-sh
Five Chinese navy ships are currently operating in the Bering Sea, off the
coast of Alaska, the first time the U.S. military has seen such activity in
the area, Pentagon officials said Wednesday.
The officials said they have been aware in recent days that three Chinese
combat ships, a replenishment vessel and an amphibious ship were in the
vicinity after observing ... 阅读全帖 |
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W*****B
发帖数: 4796 | 49 基于一个90年代的导弹条约。现在俄国想在飞机上装高清摄像机，美国害怕了。
Russia Asks Permission for Closer Look From Above the U.S. 1 / 16
The New York Times The New York Times
By ERIC SCHMITT and MICHAEL R. GORDON
4 hrs ago
SHARE
How can we protect workers in the gig economy?
7 overhyped careers to avoid
18, 2016. The private helicopter with five people aboard crashed and sunk
into the water, leaving a teenage passenger in critical condition. (Shawn
Winrich via the AP)
Teen dies after Hawaii crash
Adm. Cecil D. Haney, commander o... 阅读全帖 |
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t***h
发帖数: 5601 | 50 http://www.ctbto.org/the-treaty/developments-after-1996/2013-dp
Media questions and answers on radionuclide detection
Vienna, 23 April 2013
1. How come the detection was made so late (when you said on 12 March that
it was improbable)?
A: The main detection was made on 8 and 9 April, a smaller one from 12 to 14
April. Detection of radioactive noble gas more than 7 weeks after an event
is indeed unusual, we did not expect this and it did not happen in 2009. We
do not know what has happened at the ... 阅读全帖 |
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