s*******r
发帖数: 921 | 1 Sorry i don't have the book.
But according to my experience, ER of doped poly was slower
that undoped. At first, I did not believe my experiment
lot's result and checked again. It really showed Doped poly
was etched slower than undoped. I did not find the answer
yet. Perhaps, it was because of the following 'drive-in'
like diffusion of doped poly, which might result in a thin
layer of silicon oxide over poly surface. Usually, undoped
poly was not followed by a diffusion step.
By the way, I used |
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h******h
发帖数: 4 | 2 poly-emitter reduces the minority carrier lift time and diffusion length in
emitter, so the stored charge in
emitter is less. This leads to less diffusion capacitance, and faster
switching.
it |
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H*****l
发帖数: 702 | 3 i could
a-si/c-si is junction interface----silicon heterojunction solar cell
a-si brings you high Ef difference, passivation on surface ( so no need on
diffusion) and still reasonable light transport
a-si is low temp process so no need to go to 800 for diffusion or anealing
and a-si dep is very fast since it is only 10-20 nm for a-si emitter/
passivator
the interest lies on " how to make efficiency from 200 degree process as
high as traditional 800-1000 degree process"
is |
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s*********g
发帖数: 46 | 4 在各种论坛上提问了很久，都没有找到合适的答案，在这里碰碰运气吧。
请教各位GGJJ，
我想用zemax的非序列模式仿真玻璃diffuser的透射及反射场。
我用的是thorlabs ground glass diffuser,技术参数如下：http://www.thorlabs.de/newgrouppage9.cfm?objectgroup_id=1132
Material: N-BK7 (Uncoated)
Scratch-Dig: 80-50
Clear Aperture: >90%
DiameterPolished Side Surface Irregularity: <4λ
Gaussian Intensity Profile
120, 220, 600, or 1500 grit
请问是否可以使用zemax的内建散射模型？如果可以，应该使用哪一种？谢谢！！
Built-in scattering models
Lambertian
BSDF = 1/p
The scattered ray projection vector has equal probabilit... 阅读全帖 |
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w********g
发帖数: 121 | 5 【 以下文字转载自 Overseas 讨论区 】
发信人: whatswrong (What's+Wrong???), 信区: Overseas
标 题: 一道本科生的工程题目，要用matlab求解
发信站: BBS 未名空间站 (Thu Mar 29 14:23:28 2007)
那位可以指点一二？
I am studying an estuarine system. I have symplified it down to being a box
of dimensions 200 km (lenght), 0.050 km (deep) and 50 km (wide). The water
flows along the length at a rate of 1 cm/s (left to right). There is a
lateral diffusion of 8.2x10^6 and a vertical diffusion of 8.2. The system is
obviously time dependent. The current concentrat |
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w********h
发帖数: 12367 | 6 (1)
SELF-DIFFUSION OF POLYMER-LIKE MICELLES
OTT A, MORIE N, URBACH W, BOUCHAUD JP, LANGEVIN D
JOURNAL DE PHYSIQUE IV
3: (C1) 91-103 MAY 1993
Document type: Article Language: English Cited References: 36
Times Cited: 5
Abstract:
We present a short review of fluorescence recovery (FRAP) experiments done
with polymer-like micelles, allowing the study of self-diffusion in these
media. The observed behavior is varied, specially in the semi-dilute regime
where one can observe reptation |
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w********h
发帖数: 12367 | 7 对于一个进入新的领域的初学者，
一本比较全面的综述可以避免很多麻烦，
大家不妨谈谈这个话题，
供感兴趣的人参考。
我先说我的。
我主要做的东西是Viscoelasticity, polymer dynamics and diffusion.
主要的综述有：
(1) TP Lodge, NA Rostein, S Prager
Adv Chem Phys, 1990, 1
(2) H Watanabe
Prog Polym Sci, 1999, 24, 1253
(3) M Tirrell
Rubber Chem & Tech, 1984, 57, 523
(4) DS Pearson
Rubber Chem & Tech, 1987, 60, 439
(5) PF Green
Diffusion in Polymers, edited by P. Neogi
New York: Marcel-Dekker, C1996
(6) WW Graessley
Adv Polym Sci, 1982, 47, 68 |
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c*******n
发帖数: 1648 | 8 来自主题: Macromolecules版 - 问题再贴 Thank you for the explanation. This problem is really difficult and can be an
independent Ph.D. project. First of all, you have to understant your reaction
is diffusion controlled or chemcally controled. These two mechanism are
totally different. Generally for condensation polymerization of low molecular
weight species, it is well known that it's not diffusion controlled. Recently
TP Lodge and CW Macoskco also proved that even condensation of high molecular
weight species on the interface of typ |
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c*******n
发帖数: 1648 | 9 Interdiffusion coeff. or selfdiffusion coeff?
If it's inter diffusion coeff. why it's surprising to know it's a negative
number at the phase seperation? If you say self diffusion, then I also want to
know the answer. |
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c*****e
发帖数: 238 | 10 Since the normal diffusion is usually pure entropic, when the enthalpic
contribution to the free energy becomes pronounced, it can dominate over the
entropy, then there might appear this negative diffusion, which is related the
concentration difference, but the real difference is governed by the chemical
potential, which still favors aggregation of similar components(A or B)
As for the difference between spinodal decomposition and nucleation, the
macroscopic difference is mainly the difference i |
|
t**********t
发帖数: 97 | 11 来自主题: Mathematics版 - 求几篇文章 感谢帮忙。t**********[email protected]
Discrete and Continuous Dynamical Systems
1. Volume: 27, Number: 4, August 2010
Trajectory attractor for reaction-diffusion system with diffusion
coefficient vanishing in time Pages : 1493 - 1509
Author(s): Vladimir V. Chepyzhov and Mark I. Vishik
2. Volume: 27, Number: 1, May 2010
On the existence of solutions for the Navier-Stokes system in a sum of weak-
spaces
Pages : 171 - 183
Author(s): Lucas C. F. Ferreira and Elder J. Villamizar-Roa
3. Volu |
|
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h***y
发帖数: 834 | 13 ☆─────────────────────────────────────☆
Aplusplus (Hakuna Matata) 于 (Sun Mar 27 11:11:49 2011, 美东) 提到:
首先我申明，我放弃我的ignore list， 欢迎所有ID参加。
每个医生护士或者其他相关人员， 无论在中国还是美国， 肯定都有一些case刻骨铭心
。 请大家把你印象最深的一例写出来， 与大家分享。 比方说， 清华男被鉈杀案，
那个中国来的护士就是诊断的关键， 相信本例就是她一辈子也忘不了的诊断。
我觉得这样的讨论有助于大家提高学医热情，丰富医学知识，开拓临床思维， 间接帮
助考版医生复习，准备CS，和 interview. 你要是能从中挑一个case让你PD
impressed，我想我的目的就达到了。
希望所有ID， 包括考生， resident， fellow， attending，PA/NP, nurse 和中国来
的医生不再从事医疗工作的， 都能奉献你的pearl. 英文中文都行。
我先来：
CC: Left leg pain for 5 days.
35 y... 阅读全帖 |
|
h***y
发帖数: 834 | 14 ☆─────────────────────────────────────☆
Aplusplus (Hakuna Matata) 于 (Sun Mar 27 11:11:49 2011, 美东) 提到:
首先我申明，我放弃我的ignore list， 欢迎所有ID参加。
每个医生护士或者其他相关人员， 无论在中国还是美国， 肯定都有一些case刻骨铭心
。 请大家把你印象最深的一例写出来， 与大家分享。 比方说， 清华男被鉈杀案，
那个中国来的护士就是诊断的关键， 相信本例就是她一辈子也忘不了的诊断。
我觉得这样的讨论有助于大家提高学医热情，丰富医学知识，开拓临床思维， 间接帮
助考版医生复习，准备CS，和 interview. 你要是能从中挑一个case让你PD
impressed，我想我的目的就达到了。
希望所有ID， 包括考生， resident， fellow， attending，PA/NP, nurse 和中国来
的医生不再从事医疗工作的， 都能奉献你的pearl. 英文中文都行。
我先来：
CC: Left leg pain for 5 days.
35 y... 阅读全帖 |
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s*h
发帖数: 1538 | 15 我从资料上copy的，希望对你有用。我自己是脑袋昏的。
Acute Pericarditis (see ECG below)
Concave upwards ST elevation in most leads except aVR
No reciprocal ST segment depression (except in lead aVR)
Unlike "early repolarization", T waves are usually lower in
amplitude, and heart rate
is usually increased.
May see PR segment depression, a manifestation of atrial injury
Example: Post-op pericarditis; note diffuse, concave-upwards ST elevation,
HR 100 bpm, PR
segm... 阅读全帖 |
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s*********d
发帖数: 335 | 16 来自主题: MedicalCareer版 - 请教问题。 看书看了大半年了，做起题来还是啥也不知道。参加小组过了FA，但是好多没理解，FA
也记不住，老是要去翻书。这么长的时间，好多牛人都看考完了。
自己却好像原地踏步，也不知道是方法不对，还是真的年纪大了，不适应考试了。
做题感觉还是心，肺的题目最难。
请教各位高人，有啥好方法。
然后现在最让我困惑的就是就是肺的那个生理，肺泡氧分压，CO2分压（PACO2 =40mm
Hg，PAO2=104 mm Hg), 动静脉血的压力等等，到底是个啥关系。还有那个Perfusion和
diffusion，到底啥意思？Perfusion limited 和Diffusion limited,到底啥意思，生
理还是病理？
请高人指点一下，不甚感谢，欢迎大家交流啊。 |
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l******g
发帖数: 278 | 17 NBME form 4
1. A 22-year-old woman with asthma comes to the physician for a follow-up
examination. She feels well. She has been treated for six acute episodes of
wheezing and nonproductive cough during the past year; her last episode was
1 month ago. Her symptoms are exacerbated when she is outside during the
spring and fall. Current medications include an albuterol inhaler and
echinacea. She has smoked one-half pack of cigarettes daily for 5 years and
does not drink alcohol. She is employed in ... 阅读全帖 |
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e****0
发帖数: 678 | 18 • Exaggerated deep tendon reflexes can be seen in lock in syndrome.
• Non bleeding varices are managed with nonselective beta-
adrenergic antagonists, such as propranolol.
• Sclerotherapy, endoscopic band ligation, and surgery are
indicated after a patient has a first episode of variceal bleeding.
• TIPS is a last resort in variceal bleeding unresponsive to
medical and endoscopic intervention.
• Ischemic colitis
CT—thickening of eth bowel ... 阅读全帖 |
|
w*****g
发帖数: 9 | 19 I am afraid this is a hard problem and you need to be more specific. As far
as I know, for a Markov random walk without the potential, the diffusion
distance is proportional to D*t^2 where D is the diffusion constant. Then
the correlation function is in a exponential form:
exp(-\sqrt{D} \tau). It is easy to get the power spectrum by doing the
Fourier transform. I think it is delta function, but not sure.
For other random processes (e.g., Gaussian) or including the potential, I
don't have a clue. |
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D***s
发帖数: 120 | 20 因为要帮广大烧炉子辛苦长纳米线的民工们挖个大坑灌水，呵呵。
还有，不是要让minority carrier diffusion length变短，diffusion length肯定越
大越好啊,它是个材料参数，表明少子在复合之前能跑多远，跟少子寿命差不多一回事。 |
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o**********y
发帖数: 1041 | 21 我最近在研究diffusion,你老人家来指导一下。。。
为什么diffusion那么复杂呢 |
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d*********6
发帖数: 1972 | 22 在diffusion的过程中可能存在多个势垒，所以有些diffusion不可以用exp(-E/KT)的动
力模型描
述，可以尝试用一个阶梯势的模型来描述 |
|
g*********n
发帖数: 808 | 23 锂电池特辑1:迈向超级电池[物理]
锂离子电池，也许是下一代能源和交通问题解决的方法
1801年，伏打把他的“电堆”装置公开给拿破仑，他不可能想到两个世纪之后，他的发
明可能成为人类生活的中心。由被盐水浸泡的锌和银电极的原始电池使得小型电化学能
源-锂电池成为了现代消费电子市场的中心。
在《瓶瓶装闪电》中，科学记者森斯-费莱彻解释了锂电池的工作原理，并且对致使锂
电池盛行的研究节奏进行了描述。每年数十亿的元件生产和数十亿的美元利润，可见移
动电子市场正在繁荣。在绿色能源中，锂电池也受到了新的挑战。费莱彻描述到发展下
一代锂电池的激烈竞争，但是可能更多的人选择现有的技术。
日益减少的石油资源以及备受关注的气候变化迫使我们使用更多的替代能源，比如太阳
能、风能，也不得不用混合动力车、油电混合车以及最终的全电动汽车来替代污染的内
燃汽车。由于我们的太阳不能按照我们的要求发光，风不能按照我们的意愿吹来，这些
可再生能源的成功应用依赖于我们高效的储电能力。电化学电池，特别是锂电池，成为
了最佳选择，因为它们把化学能转变为电能效率很高并且无有毒物质释放。
玻利维亚和南美国家巨大储量的碳酸锂盐可使汽... 阅读全帖 |
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w**********y
发帖数: 1691 | 24 这么说不太对.一条path是可以fit参数的,time series里面的AR,ARMA都是一条path去
fit.OU process当然也是.
以前有一些用MCMC(Bayes)的方法去fit,这个方法几乎是万能的,可以fit各种复杂的
stochastic volatility model,但是时间性和可靠性可能会很不好..
Chicago的Nicholas Polson有这方面的paper
应该kalman filter啊,particle filter啊也能做..
对于一般的diffusion,很多人都做过相关research,参看:
Maximum-Likelihood Estimation of Discretely-Sampled Diffusions: A Closed-
Form Approximation Approach, Econometrica, 2002, 70, 223-262
Yacine Sahalia的主页上有matlab的code. 他还有其它几篇关于model fitting的paper.
对于如何根据Derivative的价格去calibra... 阅读全帖 |
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w*****e
发帖数: 197 | 25 Not to thread-crap.
I think good interview questions should have some cohesive theme.
Sometimes, folks just mix and match questions because they think
those questions share some "background", like they both use a coin
or red/black balls. If the extension involves completely different
techniques, it is probably a bad mix of questions and hence
it is not going to really tell the difference among candidates that
well.
A good question can go like this:
1. Describe BS;
2. What are its assumptions;
3.... 阅读全帖 |
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l*******3
发帖数: 186 | 26 As long as there is stochatistic vol, the market is already incomplete. Let
alone adding jumps.
However, you can set up a stochastic discount factor to derive the model
under the risk neutral measure by the no-arbitrage assumption. Then you just go ahead to estimate the model in the risk neutral process if you are
interested in option prices. If you are interested in equity market, then just estimate the model in the physical measure is enough. The market does not have to be complete as always.
... 阅读全帖 |
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x*t
发帖数: 30 | 27 I guess what the chemist and physicit could do is
just to control the difussivity D, as the D has
reflected all of chemistry and physics(not mechanics).
If we assume the N-S euqation is still applicalbe here,
the diffusion is proportinal to 1/(Re*Sc), Re=U.L/mu,
Sc=mu/D,
U, L :velocity and lengh scale respectively, mu, viscosity.
So we could enlarge the U, or L to reduce the diffusion as
well.
But maybe you don't like it.
So I suggest another wholly mechanical way(just rough
suggestion):
appyin |
|
u******3
发帖数: 11 | 28 To test my first hypothesis, I would like to classify firms into firms with
diffuse ownership (most shareholders are individuals) and firms with
concentrated ownership (most shareholders are institutions). The variable IS
is used to refer to ownership. IS will be zero (one) if a firm is marked by
diffuse ownership (concentrated ownership).
To test my second hypothesis, I would further classify firms with
concentrated ownership (IS=1)into firms with most shareholders being short-
term oriented sh |
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q**j
发帖数: 10612 | 29 sigma不能diffuse。否则无解。a_0没有必要diffuse。sigma_a可以。有解。公式论文
里面有。 |
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R*******c
发帖数: 249 | 30 请问 “不能diffuse” 和 “没有必要diffuse” 是什么意思呢？ |
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g*2
发帖数: 658 | 31 刚刚把堆积了几个星期的nejm翻看了一下，居然在11月底的那期case discussion就是
讲得这个病
http://www.nejm.org/doi/full/10.1056/NEJMcpc1103565
Case 36-2011 — A 93-Year-Old Woman with Shortness of Breath and Chest Pain
Presentation of Case
Dr. Pooja Agrawal (Emergency Medicine): A 93-year-old woman was seen in the
emergency department at this hospital because of chest pain and shortness of
breath.
The patient had been in her usual state of health, with hypertension and
chronic renal insufficiency, until the morning of admission, wh... 阅读全帖 |
|
b******a
发帖数: 704 | 32 Common Causes of Pneumonia
In a young patient without coexisting illnesses, there are many potential
infectious causes of pneumonia.1 The patient's history gives us several
clues that help in reducing the list of possible pathogens. This patient
underwent bronchoscopy and bronchoalveolar lavage. Negative bacterial
cultures argue against common, easy-to-culture bacterial pathogens.
Furthermore, the patient did not have a response to multiple, broad-spectrum
antibacterial therapy including erythro... 阅读全帖 |
|
a*********d
发帖数: 2763 | 33 case 2
A 25-year-old woman is 24 weeks’ pregnant. She has no concerns except for
intermittent nervousness and insomnia. Her gynecologist notes that she has
gained only 5 pounds and has developed diffuse enlargement of her thyroid
gland.
On physical examination she has slight lid lag and stare. The thyroid gland
is diffusely enlarged (about 3 times normal size), soft, and without
palpable nodules. Heart rate is 94 beats/min at rest. Obstetric findings are
normal for 24 weeks’ gestation.
Laborator... 阅读全帖 |
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y*******n
发帖数: 10103 | 34 diffuser 是车底的。跟车身形成一个“翼面”
据说对下压力影响巨大，40%的下压力从diffuser来。想想也是，车身那个面积多大啊。
估计是对规则解释有所分歧。具体不太懂。 |
|
x*b
发帖数: 5723 | 35 我倒是觉得还行，Carbon尾翼和Diffuser中间的黑色扰流板部分对比也还算OK。实在不
行坐等第三方改装厂发布Carbon的Diffuser？ |
|
w*******y
发帖数: 60932 | 36 REINDEER is the code that gives free shipping on books and 96cent shipping
per item on all other items. They have Medium Tumblers, Electric unit with
the 2 pack refills sold seperately as well as reed diffusers. I put the
code in a with a book and it said to separate the order if I wanted FS on
the books. I took the book out of the cart and it seemed no matter what I
added my shipping stayed 2.49 for standard shipping. I had sales tax yet
there are cash back sites to use to recoup.
Link:
htt... 阅读全帖 |
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s*******y
发帖数: 384 | 37 diffuser是扩香器,但carscenter是车内用的扩香器~~~也叫做car diffuser
又 |
|
r***o
发帖数: 1285 | 38 Explanation: Open clusters of stars can be near or far, young or old, and
diffuse or compact. Open clusters may contain from 100 to 10,000 stars, all
of which formed at nearly the same time. Bright blue stars frequently
distinguish younger open clusters. M35, pictured above on the upper left,
is a relatively nearby at 2800 light years distant, relatively young at 150
million years old, and relatively diffuse, with about 2500 stars spread out
over a volume 30 light years across. An older and more |
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n**e
发帖数: 2026 | 39 在《诊断骗局之鱼目混珠》一文中，尼罗河揭示贝志城在中央电视台文献记录片中展示
的“远程诊断”不过是他自己从教科书上摘录的内容。人们不禁要问，既然贝志城声称
手里有上千份电邮回复，其中30%作出了铊中毒的正确诊断。一个绝对数字是48份邮件
作出了铊中毒的正确诊断。拿出一份邮件来给大家见识一下这个“正确诊断”应该是没
有问题的。贝志城之所以不能出示“正确诊断”并不是因为他手里没有这样的东西，而
是他遇到一道绕不过去的坎：时间限制性。注意下面这段对话（中央电视台文献记录片
《朱令的12年》）：
贝志城：十号发了那是个周一，周三我就给朱令他爸爸打电话说，我看到提问里还有说
是铊中毒。
贝志城：很多医生很激烈地发表意见，说一定要作这个化验，因为她的症状太像铊中毒
了。
朱令父亲：贝志城给我打了个电话，说有人觉得是不是就是铊中毒。
朱令母亲：他（贝志城）说，阿姨你是怎么了，这么多人都说是铊中毒，你为什么就不
去化验。
一个无法改变的事实是，贝志城在48小时之内（1995年4月10日到12日）就锁定了铊中
毒诊断。而他手里根本就没有在48小时之内回复的“正确诊断”。这就是为什么他不敢
当众展示“正确... 阅读全帖 |
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n**e
发帖数: 2026 | 40 【 以下文字转载自 WaterWorld 讨论区 】
发信人: nile (nile), 信区: WaterWorld
标 题: 清华投毒案——诊断骗局之神话先知
发信站: BBS 未名空间站 (Sat Feb 27 11:11:40 2016, 美东)
核心提要：贝志城通过远程诊断帮助协和医生挽救了朱令的生命，他自己却在第二年被
北大“劝退”。这里面的全部秘密就在于一个关键问题：时间限制性。尼罗河对证据的
分析表明，所谓“远程诊断“不过是一个明修栈道的先知神话。
在《诊断骗局之鱼目混珠》一文中，尼罗河揭示贝志城在中央电视台文献记录片中展示
的“远程诊断”不过是他自己从教科书上摘录的内容。人们不禁要问，既然贝志城声称
手里有上千份电邮回复，其中30%作出了铊中毒的正确诊断。一个绝对数字是84份邮件
作出了铊中毒的正确诊断。拿出一份邮件来给大家见识一下这个“正确诊断”应该是没
有问题的。贝志城之所以不能出示“正确诊断”并不是因为他手里没有这样的东西，而
是他遇到一道绕不过去的坎：时间限制性。注意下面这段对话（中央电视台文献记录片
《朱令的12年》）：
贝志城：十号发了那是个周一，周三我... 阅读全帖 |
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n**e
发帖数: 2026 | 41 【 以下文字转载自 WaterWorld 讨论区 】
发信人: nile (nile), 信区: WaterWorld
标 题: 清华投毒案——诊断骗局之神话先知
发信站: BBS 未名空间站 (Sat Feb 27 11:11:40 2016, 美东)
核心提要：贝志城通过远程诊断帮助协和医生挽救了朱令的生命，他自己却在第二年被
北大“劝退”。这里面的全部秘密就在于一个关键问题：时间限制性。尼罗河对证据的
分析表明，所谓“远程诊断“不过是一个明修栈道的先知神话。
在《诊断骗局之鱼目混珠》一文中，尼罗河揭示贝志城在中央电视台文献记录片中展示
的“远程诊断”不过是他自己从教科书上摘录的内容。人们不禁要问，既然贝志城声称
手里有上千份电邮回复，其中30%作出了铊中毒的正确诊断。一个绝对数字是84份邮件
作出了铊中毒的正确诊断。拿出一份邮件来给大家见识一下这个“正确诊断”应该是没
有问题的。贝志城之所以不能出示“正确诊断”并不是因为他手里没有这样的东西，而
是他遇到一道绕不过去的坎：时间限制性。注意下面这段对话（中央电视台文献记录片
《朱令的12年》）：
贝志城：十号发了那是个周一，周三我... 阅读全帖 |
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s***t
发帖数: 1 | 42 【 以下文字转载自 Medicine 讨论区 】
【 原文由 sprit 所发表 】
Welcome to post this article to other bbs or website.
本文欢迎转载
！！！Looking for some kind of effective cure or medical treatment
urgently! The disease is in the uraemia stage of chronic prostration.
Both of kidney presented diffusing pathology and atrophy.Hope get help
from international society. Thanks a lot!!
！！！慢性肾衰竭尿毒症期，寻找专家以及特效药或疗法，拯救19岁的年轻生命。
希望获得社会的支持！谢谢！！
Enclosed by the details：
i got the news on the TV program of 99CHAO'YANG. For a mama, what does |
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b****g
发帖数: 4933 | 43 英文版，可以在《自然》杂志的网站上 http : / / w w w.nature.c o m/nature/
journal/v431/n7006/pdf/nature02878.pdf
，搜索 Genetic Evidence Supports Demic Diffusion of Han Culture 就可以找到
纯学术讨论，请勿将此文内容用于种族主义宣传。
每种观点都可以在历史上找到和自己观点相对应的例子来对应，因本文数据经常被引用
而引用者往往不知其具体来源，更有甚者任意篡改其中数据来加以印证自己的观点，因
此恶质行径，特此做个引申，搜集资料以嗜大家。
以下为中文版内容，方便没有安装PDF阅读器的读者阅读：
《遗传学证实汉文化的扩散源于人口扩张》
[ 转自铁血社区 http://bbs.tiexue.net/ ]
文波1,2，李辉1，卢大儒1，宋秀峰1，张锋1，何云刚1，李峰1，高扬1，毛显赟1，张
良1，钱
吉1，谭婧泽1，金建中1，黄薇2，Ranjan Deka3, 宿兵1,3,4，Ranajit Chakraborty3,
金力1,3
1. 复旦大学 现代人类学研究中 |
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i***z
发帖数: 7508 | 44 洗脑教育的结果。 看看我们现在学的数学是古希腊的， 法律制度是希腊，罗马起源的
。 科学技术也是西方发源的。不过，这个书批评的也很多：
The book has been criticized by Ricardo Duchesne for offering a diffuse definition of the West which Morris envisions encompassing not only Europe but all civilizations descending from the Fertile Crescent, including Islam, and a propensity to level out fundamental differences between the development of the West and the rest, which disregards the singular role[clarification needed] of Europe in shaping the modern world
2 |
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S***g
发帖数: 14 | 45 印第安人和南太平洋岛民的迁徙,其实是上古大规模人类迁徙的不多的特列.前面一个基
本上面对的是一个自然条件优越的真空大陆。在几百年的时间里，基本上是一个从北到
南的diffusion过程，留下个很多证据和遗迹。
岛民的迁徙，那完全是大海的帮助。更不具备可比性。
迁移，就意味着进入别人的势力范围，吃别人的粮食，打别人的野兽。这个过程，不可
能是和和气气的。如果我足够厉害可以打败另一个部落，那么接下来最合理发生的情况
是占别人的地盘。而不是继续往东走, 除非真的想探索未知世界。如果不幸打不过，那
么生存下来就是很大的问题了。My 2 cents. |
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m*********a
发帖数: 3299 | 46 汉族的历史，男人的Y染色体单一，北方和南方一致的，但是女性的DNA是非常复杂的。
Y-chromosome haplogroup O3 is a common DNA marker in Han Chinese, as it
appeared in China in prehistoric times. It is found in more than 50% of
Chinese males, and ranging up to over 80% in certain regional subgroups of
the Han ethnicity. However, the mitochondrial DNA of Han Chinese increases
in diversity as one looks from northern to southern China, which suggests
that male migrants from northern China married with women from local peoples
after arriving... 阅读全帖 |
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t**g
发帖数: 784 | 48 作者序
——为卢嘉锡主持翻译出版的中国科学技术史》全译本而作
《中国科学技术史》中文全译本将由我的老朋友卢嘉锡主持问世，这对我是莫大的喜
讯。早些时候，北京和台北都曾有译本，但不很完全；由于种种原因，也并非尽如人意
。我在研究中国与西方关系方面所发现的全部宝藏，将能以中国人自己的文字与中国读
者见面，真可谓猗欤盛事。
如果要让我明确指出，中西关系研究的最主要特点是什么，我就会说是比较法。当
然，还有许多别的要求。例如，必须能阅读中文和多种西方文字；必须具有能看出并非
每一部著作都符合人们所声称的写作年代的良好的语文学基础。然而，绝对不可缺少的
要求是，要能充分理解中国和西方许多发现和发明的年代差异。
例如，许多中国学者并非不知道苏颂在1094年撰著的《新仪象法要》[自动浑仪和
浑象（天文钟）的新设计]。他们很熟悉这部著作，但却无人由于书中描述了擒纵机构
这种巧妙的装置而产生强烈的印象，因为他们根本没有想到，迟至公元1300年左右，欧
洲还没有类似的设计。擒纵机构是一种减低轮速的装置，以便实现它与人类的原始时计
（星空的周日视运动）同步。办法是把时间分割为很短而均... 阅读全帖 |
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d******a
发帖数: 32122 | 50
Nature 431, 302-305 (16 September 2004) | doi:10.1038/nature02878; Received
28 April 2004; Accepted 20 July 2004
Genetic evidence supports demic diffusion of Han culture
Bo Wen1,2, Hui Li1, Daru Lu1, Xiufeng Song1, Feng Zhang1, Yungang He1, Feng
Li1, Yang Gao1, Xianyun Mao1, Liang Zhang1, Ji Qian1, Jingze Tan1, Jianzhong
Jin1, Wei Huang2, Ranjan Deka3, Bing Su1,3,4, Ranajit Chakraborty3 & Li
Jin1,3
State Key Laboratory of Genetic Engineering and Center for Anthropological
Studies, School of Lif... 阅读全帖 |
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