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全部话题 - 话题: desity
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r*****n
发帖数: 964
1
是inject high desity polyurethane进去把房子Lift起来。如果买了,不修的话会有
什么后果?谢谢
b*****5
发帖数: 32
2
有些人的羊穿结果出来的比较晚,被告知是细胞长得慢,有这么回事吗?LAB是监测OD
来看细胞DESITY的吗?
LAB里是用什么培养液养这些细胞的呢?还是就靠那点羊水?
怎么区分这细胞是胎儿的还是母亲的呢?
羊水的暂时保存和运输(从医院到LAB的培养箱)是什么条件呢?
为什么羊穿的结果也只能99%准确呢?
n******s
发帖数: 210
3
有些人的羊穿结果出来的比较晚,被告知是细胞长得慢,有这么回事吗?LAB是监测OD
来看细胞DESITY的吗?
This's should be OK,
Not only cell density, something else, like protein, lipid concentration,
contamination, and so on.
LAB里是用什么培养液养这些细胞的呢?还是就靠那点羊水?
No, some medium like the cells line growing up in the lab incubator.
怎么区分这细胞是胎儿的还是母亲的呢?
this is easy, for single cell or clones, genetic markers can tell.
While, most of time, what you want to observe it fetal cells, and the
majority cell in uterus is fetus'. You don't have to worry about the
p
n******s
发帖数: 210
4
OD来看细胞DESITY的吗?
d*******g
发帖数: 1265
5
来自主题: Fishing版 - 250刀的杆子折了!
越南人用的是巴掌长的小鱼lure,算是crank bait吧。质量大(好像是他们自己钻孔,
注入东西,把lure加重的,市场上买不到desity那么大的lure)。因为lure很重,所以
不用挂egg,直接就能甩到大坝下。草鱼只是副产品,他们目的是wiper

掉。
B*****R
发帖数: 1539
6
It's been going on more than 3 years. they have pizza boxes now(maybe
chassis). 10G desity is their current priority I believe. whether they do
core switch, or even router, it is their secret. I have no idea....
I believe if goog wants to do sth by their own, they certainly can. About if
they should do it, or how soon they can deliver, or if it's worthy...I
dunno. One thing I'm sure is they currently don't need so many fancy
features. pretty simple config w/o much usr interaction. it is not sth
h******5
发帖数: 58
7
来自主题: Quant版 - Implied Risk Neutral Density
Sorry can't type Chinese in my company.
I am working on a project to calculate VaR based implied Risk Neutral
Density. Firstly I calculate implied vols from deep in-the-money to deep-out
-money option chains, then smooth out the vol smile and calcualte Risk
Neutral Density based on BS model(esstentially RND is calculated by the
second derivative of option prics to strke). Finally fit a parametric
distribution to the densities based on least square method. I got some
chanellenges that 1) the shap... 阅读全帖
h******5
发帖数: 58
8
来自主题: Quant版 - Implied Risk Neutral Density
Sorry can't type Chinese in my company.
I am working on a project to calculate VaR based implied Risk Neutral
Density. Firstly I calculate implied vols from deep in-the-money to deep-out
-money option chains, then smooth out the vol smile and calcualte Risk
Neutral Density based on BS model(esstentially RND is calculated by the
second derivative of option prics to strke). Finally fit a parametric
distribution to the densities based on least square method. I got some
chanellenges that 1) the shap... 阅读全帖
s***e
发帖数: 911
9
来自主题: Science版 - 高手们再帮我一把

According to your problem, the speed field is:
q(x,t)=dx/dt
which is the velocity of the particle at time t and the position x.
Let's consider a volume element in the fluid: the changing of the number
of the particle in the volume dN/dt is -surface_Integrate[q*n \dot ds](this
is called the continuity condition, or the condition of the mass
conservation),
where n is the number desity, and ds is the surface element(a vector).
surface_Integrate[q*n \dot ds]=Volume_integrate[div(q*n)]
Hence we have
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