l**********1
发帖数: 5204 | 1 Sure
Sampling Tumor gDNA can not satisfied
Illumina high density SNP arrays while it below 5 ng even from 2015
now 2010 is 200 ng one sample
pls refer:
We also routinely run the high density array technique to genotype up to 1
million snps per subject. The available platform is from Illumina and is
able to generate genotypes for up 300-750 subjects per week depending on the
type of array chosen.
Required material 200 ng DNA per sample
Reaction format 96 wells
Detection machine iScan b... 阅读全帖 |
|
b******e
发帖数: 88 | 2 P1看不到很正常
你试试把2ml P1（3-4天）扔进10ml Sf9里,没隔一天查一次cell density
如果cell density加倍了就加midium稀释回2m
这样养4-5天看看，只要cell density不加倍了就说明成功了
另外cellfectin II reagent加多点，bacmid浓度大一些 |
|
l**********1
发帖数: 5204 | 3 >发信人: sunnyday (胖头鱼。按斤卖就赚了), 信区: Biology
标 题: Re: sunnyday，你再讲讲BT转基因粮食的看法吧
发信站: BBS 未名空间站 (Sun Oct 20 19:48:54 2013, 美东)
ignored stuff
如果中国的转Bt蛋白水稻被批
准的话，将是世界上第一个被广泛食用转Bt蛋白的作物
-----
哪国人都能用Bt 水稻或小麦, 但以三聚氰氨为代表的 '一切向钱看, 摸着石头过河'
的土鳖用了的话
有再来一次 <<寂静的春天>> 的 可能 范围是横跨整个欧亚大陆
http://zh.wikipedia.org/wiki/寂静的春天
n.b.
Cry1F Bt 不是对脊椎动物的 而是对非对象的有益无脊椎动物 比如蜜蜂等
土鳖可以做到致死率 不是以下论文的No. 4 的<1% 而是 No.3 >50% 吧
pls refer
3. The greatest source of variability in estimated mortality was species
sensitivity. Before... 阅读全帖 |
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n**e
发帖数: 2026 | 4 【 以下文字转载自 WaterWorld 讨论区 】
发信人: nile (nile), 信区: WaterWorld
标 题: 美国科学促进会《科学》大旗下的转基因谎言
发信站: BBS 未名空间站 (Fri Oct 30 10:18:45 2015, 美东)
今年初，美国科学促进会（AAAS）和皮尤研究中心（Pew Research Center）联合公布
的一项调查显示，88％的科学家认为转基因食品可安全食用，持这一看法的公众只有37
％。报告认为差距如此之大的一个可能原因是，三分之二的公众认为科学家对转基因食
品的健康后果没有清晰认识。这就是真正的原因吗？
根据报告全文，皮尤中心给19，984名科学家发出了调查问卷，3748人（18.8%）完成了
问卷调查。其中生物医学学科背景的科学家占50%。报告没有说明50%的生物医学背景是
否能够代表科学家总体的学科构成。更大问题是在这50%的科学家人群中，有多少人的
工作是与转基因作物的研究有关，以什么样的方式相关。报告没有提供任何信息。
由于这些关键信息缺失，88%的科学家相信转基因安全的说法毫无意义。在一个没有代
表性并且无法排除... 阅读全帖 |
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r*********e
发帖数: 281 | 5 not sure about the pmos in pwell stuff.
poly-emitter has higher gain because the current enjected from the base to
the emitter is lower.
This current component depends on the gradient of excess minority carriers
in the emitter. In the metal/Si case, the density of excess minority
carriers at the metal/Si interface is virtually 0. In the poly/Si case, the
density of excess minority carriers at the poly/Si interface is greater than
0, leading to lower gradient of excess minority carrier density an |
|
r*********e
发帖数: 281 | 6 not sure about the pmos in pwell stuff.
poly-emitter has higher gain because the current enjected from the base to
the emitter is lower.
This current component depends on the gradient of excess minority carriers
in the emitter. In the metal/Si case, the density of excess minority
carriers at the metal/Si interface is virtually 0. In the poly/Si case, the
density of excess minority carriers at the poly/Si interface is greater than
0, leading to lower gradient of excess minority carrier density an |
|
b**m
发帖数: 18 | 7
Correct me if I am wrong. Rubber is rubber-like because of the low crosslink
density. If the crosslink density is 0, it becomes a thermoplastic, and if the
crosslink density is high, it is a thermoset. Based on this understanding, why
a thermoplastic turns to a rubber when Tg is reached? |
|
w********h
发帖数: 12367 | 8 来自主题: Macromolecules版 - 几个弱智问题 good point. we indeed calculate the density of polymers using the parameters
of packing.
I thought of that density problem when I met Lodge-McLeish model.
apparently they use the same density value for all of them.
approximately it is RIGHT, anyway.
The second question is because I have a question:
why polymer dynamics has various length scales?
from backbone bond to repeat unit length to Kuhn length to screening length to
Rg to whatsoever...
for others, I am clear,
but for that Kuhn length,
I a |
|
h***i
发帖数: 3844 | 9 你是问的是regression 阿
一般的regression model
y=f(x)+\sigma(x)\epsilon,
\epsilon是error term,
你的data是(y_{i},x_{i}), y_{i}=f(x_{i})+e_{i}*\sigma(x_{i})
density就应该是(f(x)+\sigma(x)\epsilon)的density 乘以x的density
所以当f(x)=x
\sigma(x)=x的时候
是N（x+xu,x^{2}v）*N(a,b)
,我 |
|
g***e
发帖数: 4074 | 10 不知道是不是指optical reflectivity的那个plasma edge，
在该edge以下的frequency不能在材料里传播，基本上都反射
回来，而在这个frequency之上的plasma反射率大大降低。
这个plasma edge 的frequency的平方可以表示为
w^2 ~ n/m*
（具体差个什么常数记不得了，总之就是正比于carrier
density n 而反比与 effective mass m*）
这个平方就直接反映drude weight。如果材料的n不变，则这
个反映effective mass的变化；反之如果说effective mass不
变，这个则反映carrier density的变化。但是在很多材料里，
由于carrier有不同种类，很难判断carrier density和
effective mass，这种情况下，谈论这个drude weight（w^2）
就比较有实际意义。
这种optical reflectivity测量，除了研究plasma edge
（drude weight）随温度变化的情况外，还经常研究它随磁场
的变化。
自 |
|
t*****e
发帖数: 133 | 11 各位大牛，请帮忙看看这个作业题，谢谢。
The following method is used to measure the molecular weight of very heavy
molecules. A liquid containing the molecules is spun rapidly in a centrifuge
, which establishes a variation in the density of the liquid. The density is
measured, such as by absorption of light, to determine the molecular weight
. Assign a fictitious "centrifugal" force to act on the molecules and show
that the density varies as
rho(molecule)=rho(liquid)exp(mw^2x^2/2kT), where w is the angular velocit |
|
t******n
发帖数: 6242 | 12 今天无聊，看到这篇无聊的文章，就给你无聊地翻译成英文吧。
探索星系的捷径
A Shortcut to Galaxy Exploration
1. 问苍天情为何物？
1. Ask what love is heaven?
有人类的历史以来，人类就不断地探索自然，扩展了解自然的疆界。哥伦布发现新大陆
就是最好的例子。人类探索自然的勇气是从哪儿来的呢？来自人类情感的力量。那么，
情感是什么东西呢？这是千万年来，文学家探索的主题。在有一些文学家的眼中，物理
学家是没有情感的冷血动物。我就是一个物理学家。但是，我一点也不埋怨这些文学家
。虽然物理学家在自然界的探索中做出了伟大的贡献，但是，物理学家从来就没有给出
情感的物理定义是什么，也没有找到自然界蕴含情感的丝毫证据。所以，虽然人类知道
自己的生存发展跟自然环境是密不可分的，但是，很少有人类表达出对自然环境感谢的
情感。在很多人的眼中，自然界是死亡无情的物质世界。中国有一句古语，叫做“天若
有情天亦老”。因为几乎所有人类相信天是不老的，所以，认为苍天是没有情感的，就
不足为奇了。我提出了一个宇宙生长衰老的模型。虽然这个模型及其简单，能解释大多
... 阅读全帖 |
|
c*******9
发帖数: 9032 | 13 Summation of Tesla's Dynamic Theory of Gravity
An excerpt from: Occult Ether Physics
by William R. Lyne
From: Don Allen
d**[email protected]
According to Tesla's lecture prepared for the Institute of Immigrant Welfare
(May. 12, 1938), his "Dynamic Theory of Gravity" was one of two far
reaching discoveries, which he "...worked out in all details", in the years
1893 and 1894. The 1938 lecture was less than five years before his death.
More complete statements concerning these discoveries can ... 阅读全帖 |
|
h*****4
发帖数: 4219 | 14 关于电场的 题目如下：
36. Three infinite sheets of charge are arranged as shown. Sheet 1 carries a
surface charge density of σ1 =3.02 µC/m2, sheet 2 carries a surface
charge density of σ2 =5.93 µC/m2, while sheet 3 carries a surface
charge density of σ3 =6.46 µC/m2. Hint + direction is to the right. （
图见附件）
答案是1区 8.7e5 N/C
2区 5.29e5 N/C
3区 -1.41e5 N/C
4区 8.7e5 N/C
怎么做出来的？
谢谢各路高手，没想出来没有面积和距离这个题目怎么做... |
|
z****s
发帖数: 532 | 15 X is Normal(0,1), what's the pdf of X|X>0?
绿皮书写的直接就是normal 0,1的density, 帮我看看哪步错了
P(X<=x|X>0)
=P(X<=x,X>0)/P(X>0)
=P(0
=2*(P(X<=x)-P(X<0))
=2*(P(X<=x)-.5)
=2Phi(x)-1
那么pdf是不是就是2*normal(0,1)的density 呢？
求E(X|X>0)为什么可以直接用normal的density呢？ |
|
r**a
发帖数: 536 | 16
ask yourself if the model doesn't have closed form density function, what
would you do next and if the model does have closed form density function,
what would you do next? What is the advantage if you have closed form
density? And you also need to persuade people that the advantage is real by
using
examples.
To be honest, I felt so far U haven't thought deeply enough. Sorry for being
straight. |
|
s****u
发帖数: 24 | 17 put a spring connecting your shoulder
and ear tip,on both sides which is assumed to be
a fixed distance during the measurement.
assume the natural length of the spring is
the distance between your shoulder and ear tip.
thus, in the air, the Spring should be in
its natural state and there is no strain.
immerse the head in a liquid with density R1
rest of body in a liquid with density R2
initially, the string will be stretched or compressed
depending on the density of R1 and R2.
Change R1 and R2 s |
|
x*****r
发帖数: 5 | 18 I also can not agree what you said.
Many modern approaches for ab-initio calculations of atoms, molecules, liquids
and solids are based on density functional theory. Basically, there are two
steps to be done: the Hohenberg-Kohn theorem supplies a rigorous theoretical
treatment; the Kohn-Sham equations then result in an iterative approach for
actual calculations. In density functional theoryl, the role of the electron
wave function is replaced by the charge density. In order to solve the
exchang |
|
d****y
发帖数: 53 | 19 Sure. To derive this formula only requires stat. mech. (the $\eta$ I mentioned
is just the mean occupation number for bosons/fermions) One derives the energy
density for each particle sepcies and then adds them up.
I mentioned cosmology b/c the formula you mentioned (energy
density for several particle species) often finds its application in
cosmology: e.g. when you want to consider the energy density of the
universe at a certain epoch, when there're photons, neutrinos, electrons... |
|
K***6
发帖数: 155 | 20 “selected area 不相同”指的是特定的神经只存在于layer A,但是我每张拍的图片的
Area of layer A都是不一样的。我觉得这种情况下比较每张图片的NERVE density还可
以，可是要怎么把同一只animal的不同图片整合起来，再与另外一只animal做比较。老
板的意思是，若有young animal五只(ABCDE)和OLD ANIMAL四只（FGHI），每只animal
拍四张照片，这样就有（A1，A2～～～B1,B2～～～），然后计算Densities of A1, A2
,A3,A4,B1,B2~~~~,最后，把Densities of A1-A4取平均值（D-A），以此类推（D-B,D-
C,D-D,D-E),这样再把五个值加起来除以5，就是D-Young，N=5;同理，可以算出D-Old，
N=4。然后比较这种神经在Old vs. Young中分布的多寡。这样行得通吗？谢谢指教！ |
|
d*******o
发帖数: 493 | 21 丫丫付包子最及时了，求长期包养。
library(gridBase)
library(lattice)
panel.piechart <-
function(x, y, labels = as.character(y),
edges = 200, radius = 0.8, clockwise = FALSE,
init.angle = if(clockwise) 90 else 0,
density = NULL, angle = 45,
col = superpose.polygon$col,
border = superpose.polygon$border,
lty = superpose.polygon$lty, ...)
{
stopifnot(require("gridBase"))
superpose.polygon <- trellis.par.get("superpose.polygon"... 阅读全帖 |
|
d******e
发帖数: 7844 | 22 是你弄混了。standard deviation是要知道population density的，而density是
unknown的，所以只能用standard error来估计。
你给的这个wiki的链接无非就是换个说法而已。The standard error is the standard
deviation of the sampling distribution of a statistic。 所谓的sampling
distribution，就是population density的一个empirical estimator罢了。 |
|
w*******y
发帖数: 60932 | 23 Shnoop.com has the PowerGenix Fast Charger + 4 AA NiZn 1.6v Rechargeable
Batteries for $7.99 with free shipping.
Here is their blurb:
quote
GO GREEN AND SAVE GREEN! THE HOTTEST SELLING BATTERIES ON THE WEB!
Originally the invention of Thomas Edison, and until recent innovations by
PowerGenix, the Nickel-Zinc battery was considered too expensive to produce.
PowerGenix s recent breakthrough s in engineering have changed this
playing field, producing a high-voltage rechargeable battery that is
de... 阅读全帖 |
|
c***s
发帖数: 70028 | 24 在九月出版的《细胞研究》(Cell research)的一篇研究中，南京大学张辰宇教授课题组展示了一项非常令人惊奇的发现——植物的微小核糖核酸（microRNA）可以通过日常食物摄取的方式进入人体血液和组织器官。并且，一旦进入体内，它们将通过调控人体内靶基因表达的方式影响人体的生理功能，进而发挥生物学作用。该研究证明植物微小核糖核酸可能是食物中的“第七种营养成分”（其他六种分别是水、蛋白质、脂肪酸、碳水化合物、维他命和稀有元素）。
原文地址
Exogenous plant MIR168a specifically targets mammalian LDLRAP1: evidence of cross-kingdom regulation by microRNA
【Abstract】Our previous studies have demonstrated that stable microRNAs (miRNAs) in mammalian serum and plasma are actively secreted from tissues and cells and can s... 阅读全帖 |
|
R******d
发帖数: 16 | 25 9000watt-hrs太夸张了。900比较reasonable一些。
Of a number of systems examined, the one:
2Na(l) + 3S(l) -> Na2S3(l)
offers a number of advantages. It requires only 2.1 grams of
sulfur per gram of sodium and gives a theoretical energy density
as written above of 346 watt-hrs per pound.
346 watt-hrs per pound = 762 watt-hrs per kg.
Energy Density of Some Materials (watt-hrs/kg)
Gasoline --------------------------> 14000
Lead Acid Batteries ----------------> 40
Hydrostorage -----------------------> 300 (per |
|
y***k
发帖数: 57 | 26 Let's talk about battery patent since you sounds like not书呆
子.
In cell level, does BYD have any new material for anode (except for Li/C),
electrolyte (Not DMC/EC??), cell separator ( not from Celguard?) and Cathod
(not from HQ/Texas AM's LiFePO??)?
Material determine the limit of energy density and power density. Most of
BYD's patents are not in cell level and are on battery pack level for design
/process. They maybe matter. But they are not key patents for material.
吧。 |
|
a****l
发帖数: 8211 | 27 Just thinking from a layman's perspective, when the population density is
high, the only choice is to go vertical, so that more people can live on the
same piece of land. Of course, I acknowledge there are many more other
factors limiting this choice, such as finalcial and local regulations, but I
think going vertical is the most reasonable solution to the high population
density.
higher |
|
z*h
发帖数: 773 | 28 The above imagination cannot become true for ever. The current energy
density of lithium batteries is approximately 0.46 MJ/kg. It is possible to
double it but it is impossible to increase it more than 10-fold. Someone (e.
g., MIT or Stanford professors) claimed it but that is a hoax because there
is a physical-chemical limit that you cannot break it for ever.
Gasoline density is about ~43 MJ/kg. It is why battery electric vehicles
would have a small market in the future.
In academia and industr |
|
g****t
发帖数: 31659 | 29 石油的价格会上升,总有一天会超过Li电池.
电动机远比gas engine效率高.
The above imagination cannot become true for ever. The current energy
density of lithium batteries is approximately 0.46 MJ/kg. It is possible to
double it but it is impossible to increase it more than 10-fold. Someone (e.
g., MIT or Stanford professors) claimed it but that is a hoax because there
is a physical-chemical limit that you cannot break it for ever.
Gasoline density is about ~43 MJ/kg. It is why battery electric vehicles
would have a small ma |
|
z*h
发帖数: 773 | 30 The lightest batteries based on energy density may be metal air batteries,
such as Li, Al, Zinc, etc. (Here the upper limit of energy density is their
combustion energy with some discount). But energy release may be hard to
control, expect Zinc. The most important thing is very high energy
consumption for regeneration of metal (Regeneration costs cannot be
decreased greatly due to thermodynamics and technology maturity after 100
year development). So they cannot be used for regular cars.
Airpla |
|
m****o
发帖数: 41 | 31 It's 10-fold power density, not energy density. You should read it with
discretion. |
|
m*****n
发帖数: 5245 | 32
Demographics of San Mateo County
As of the census of 2008,[2] there were 712,690 people, 252,648 households,
and 171,564 families residing in the county. The population density was 2,
575/sq mi (808/km²). There were 266,469 housing units at an average
density of 780/sq mi (424/km²).
The racial makeup of the county was
46.1% non-Hispanic White,
3.51% Black or African American,
0.44% Native American,
20.04% Asian,
1.5% Pacific Islander,
8.4% from other races, and
3.9% from two or more |
|
D********y
发帖数: 4948 | 33 Switzerland has an area of 41,285 square kilometres (15,940 square miles).
The productive area - that is, the area without the lakes, rivers,
unproductive vegetation and no vegetation at all - covers 30,753 square km (
11,870 square miles).
It measures 220 kilometers (137 miles) from north to south and 350 km (217
miles) from east to west.
The Jura, the Plateau and the Alps form the three main geographic regions of
the country.
Switzerland has a population of 7.4 million. Population density is ... 阅读全帖 |
|
D********y
发帖数: 4948 | 34 http://en.wikipedia.org/wiki/Christchurch
Population (June 2010 estimate)[1]
- Territorial 376,700
- Density 264.2/km2 (684.2/sq mi)
- Urban 390,300
- Urban density 863.5/km2 (2,236.4/sq mi)
不幸发现 人口密度被JY乘以2了 |
|
a***r
发帖数: 594 | 35 美国的划分也是这样的。比如：
MIT 物理系的“核物理实验室”涵盖该系的理论物理中心：
http://web.mit.edu/lns/research/index.html
research interests: anti-matter, neutrino physics, dark matter, structure of
proton, structure of high density matter and early universe.
Research on neutrino oscillation (standard and slightly beyong standard
model physics), protron structure (asymptotic and none asymptotic QCD) and
high density matter (heavy ion collider) are loosely considered topics of
modern nuclear physics.
MIT 的核工程系。
http://web.mit.... 阅读全帖 |
|
w*********g
发帖数: 30882 | 36 南京大学张辰宇教授重大发现 “剑指”转基因食物安全(图)
在九月出版的《细胞研究》(Cell research)的一篇研究中，南京大学张辰宇教授课题
组展示了一项非常令人惊奇的发现——植物的微小核糖核酸（microRNA）可以通过日常
食物摄 取的方式进入人体血液和组织器官。并且，一旦进入体内，它们将通过调控人
体内靶基因表达的方式影响人体的生理功能，进而发挥生物学作用。该研究证明植物微
小核糖核酸可能是食物中的“第七种营养成分”（其他六种分别是水、蛋白质、脂肪
酸、碳水化合物、维他命和稀有元素）。
南大教授张辰宇作《21世纪生物科学与生物经济》讲座
原文地址
Exogenous plant MIR168a specifically targets mammalian LDLRAP1: evidence of
cross-kingdom regulation by microRNA
【Abstract】Our previous studies have demonstrated that stable microRNAs (
miRNAs) in mammalian serum and... 阅读全帖 |
|
m*****n
发帖数: 204 | 37 Harrisburg NC? Sounds like a decent small town:
As of the census[1] of 2000, there were 4,493 people, 1,556 households, and
1,322 families residing in the town. The population density was 718.4 people
per square mile (277.6/km²). There were 1,614 housing units at an
average density of 258.1/sq mi (99.7/km²). The racial makeup of the
town was 94.75% White, 3.23% African American, 0.42% Native American, 0.93%
Asian, 0.22% from other races, and 0.45% from two or more races. Hispanic or
La... 阅读全帖 |
|
T*R
发帖数: 36302 | 38 经常有人抱怨说美国CT/MRI多贵，我给你们看看私立的市场价吧：
Cardio-Med is equipped to perform additional scans as listed below to assist
your physician in ensuring comprehensive early detection of diseases.
Lung Scan (Chest CT Scan)
Detects lung cancer and other abnormalities of the lungs. Lung tumors can be
detected at the earliest stages when lung cancer can be curable. $295
Kidney Scan
Detects kidney cancer and stones. $295
Heart and Lung Scan Combination
$590
Bone Density Scan
Determines bone density and calciu... 阅读全帖 |
|
x****u
发帖数: 12955 | 39
Each layer of deposit is very thin, so there's no problem for laser to melt
it through.
Density isn't a problem if you can control the speed of deposition and
temperature so that the metal naturally forms crystalline structure. By
controlling the crystal growth, you get exactly the density you want, even
better than forging. |
|
h*******g
发帖数: 2201 | 40 唐教授是很不地道的.Nobody should be doing this.She should be kicked out of
her research field because this violation. She does not have the basic
humanity to be a scientist, even more shameful to do such thing to her own
race, like a 外F.
deuterium 对细胞的新陈代谢会产生很大的副作用(非放射同位素毒性),如果你是做NMR
,你会用E Coli表达蛋白, E Coli需要很长的时间才能适应deuterated water because
of the isotopic mass of deuterated water is significantly different than
proton water.
check here:
http://en.wikipedia.org/wiki/Heavy_water
Heavy water is not radioac... 阅读全帖 |
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b*******y
发帖数: 4304 | 41 How Do We Know When Voyager Reaches Interstellar Space?
Sept 12, 2013
Artist's concept of Voyager's distances
You Are Here, Voyager: This artist's concept puts huge solar system
distances in perspective. The scale bar is measured in astronomical units (
AU), with each set distance beyond 1 AU representing 10 times the previous
distance. Each AU is equal to the distance from the sun to the Earth. It
took from 1977 to 2013 for Voyager 1 to reach the edge of interstellar space.
Image Credit: NASA/J... 阅读全帖 |
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S**C
发帖数: 2964 | 42 I am not in battery area so I will not comment, although I hear some expert
complaining rechargeable battery over the last 10 years has no progress.
My main argument is regardless battery energy density (unless of course if
they get close to gasoline energy density), the core issue is the shear
amount of energy that need to be charged to the battery in a reasonable
amount of time. |
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D*********n
发帖数: 279 | 43 http://en.wikipedia.org/wiki/Native_Americans_in_the_United_Sta
Native Americans in the United States
From Wikipedia, the free encyclopedia
Jump to: navigation, search
"American Indian" redirects here. For other indigenous peoples, see
Indigenous peoples of the Americas and other geographic regions. For
Americans from South Asia, see Indian American.
This article may be too long to read and navigate comfortably. Please
consider splitting content into sub-articles and/or condensing it. (January
2... 阅读全帖 |
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c*****g
发帖数: 21627 | 44 在传统城郊居住模式向轻城区、高密度的居住模式转变中 ，会有重要的经济增长机会
。经济研究显示，一片住宅区域居民人数扩大一倍，则生产力增大 6% 至 28%。经济学
家发现，全美各州范围内增加单位劳动力输出的因素中有超过一半和居住密度有关。毕
竟我们的财富不仅是由技能和才华决定，同样取决于获取周围想法的能力；聪明人之间
的碰撞会增加带来新成果的机率。而最终，如果千禧一代能够将我们的社会推向一个更
加分享、联系更紧密的状态，将不仅仅是改变美国消费文化这么简单，而是能够在未来
几十年里让美国走上更稳固的经济发展路线。
the shift away from traditional suburbs toward denser, urban-light living
could have major economic-growth implications on its own. Economic research
shows that doubling a community’s population density tends to increase
productivity by anyw... 阅读全帖 |
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h*********g
发帖数: 9102 | 45 As of 2013, aerographene had a lower density at 160 g/m3, or 0.13 times the
density of air at room temperature. |
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I******I
发帖数: 14241 | 46 朱的继父劳伦斯?阿迪科特（Laurence Addicott）是一名陆战队退伍军人，目前在宾州
国民警卫队工作
共和先驱新闻网（republicanherald.com）22日报道，朱2012年6月随母亲从中国广州
来到美国，并于当年秋天成为派恩格罗夫（Pine Grove）高中的一名学生。
pine grove,pa是宾州阿巴拉契亚山脉里的一个村，只有2158人。
As of the census of 2000, there were 2,154 people,877 households, and 558
families residing in the borough. The population density was 1,997.0 people
per square mile (770.1/km²). There were 937 housing units at an average
density of 868.7 per square mile (335.0/km²). The racial makeup of the
borough was ... 阅读全帖 |
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发帖数: 1 | 47 Country Comparison > Hospital bed density
Rank Country Hospital bed density (beds/1,000 population)
1 Monaco 13.8
2 Japan 13.7
3 Korea, North 13.2
4 Belarus 11.3 |
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F********r
发帖数: 878 | 48 BS. Compressed to a density of somewhere between 500 to 1,000 grams per
cubic centimeter? 25 to 50 times the density of gold? |
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v**e
发帖数: 8422 | 49 CIA 利比亚反叛者们是来自伊拉克的基地武装分子ZT- 到底是谁利用了谁还真难说
来源: 没底 于 2011-10-30
CIA Libya Rebels are Al-Qaeda Fighters From Iraq
Politics / Al-Qeeda Mar 29, 2011 - 07:54 AM
By: Global_Research
Politics
Diamond Rated - Best Financial Markets Analysis ArticleDr. Webster G.
Tarpley writes: “Serpents, thirst, heat, and sand … Libya alone can
present a multitude of woes that it would beseem men to fly from.” Lucan,
Pharsalia
Washington DC, March 24, 2011 — The current military attack on Libya has
been motivated by UN S... 阅读全帖 |
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G***G
发帖数: 16778 | 50 in physics, not the body weight is the key element.
density may be more important than body weight.
this is why a lot of athlets must drink drops of water before
they began to run.
I am just joking here.
acturally, density, wind drag(body area, body curve, and body shape)
gravity center, inner force (acceleration) are
mixed effects for the kind of sport.
without enough funding, I cannot explain detail about it.
but it is not difficult to figure the factors out. |
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