I****s
发帖数: 467 | 1 yes, you can but usually you don't need that many pieces of paper. The
calculation is little easier than Becker. |
|
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y****0
发帖数: 136 | 3 Can the scientific calculator substitute the finacial one? |
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m*****e
发帖数: 17 | 4 my professors only allow us to use the four-function calculator.... |
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l****z
发帖数: 29846 | 5 完全可以,但速度慢. 楼上的已经说了. texas那个financial calculator算bond,
mortgage很方便. |
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r****o
发帖数: 20 | 6 哪里可以买到BA II plus calculator啊？在SOA得on-line store 么？还有这个计算器
够用么
是不是还需要买其他得？thanks |
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N****e
发帖数: 146 | 7 buy the cheaper one
Make sure familiar with the setting up. since when you enter the exam room,
most likely, the supervisor will reset the calculator.
it will go back to the stupid "financial " mode. |
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l********p
发帖数: 1234 | 8 想买TI-84 graphing calculator , 发现都在1００多 dollars， 那里有deal for
cheap one?
thank you everyone for this advice. |
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t*******9
发帖数: 240 | 9 Can we bring Calculator in? Which model is eligible? The syllabubs didn't
mention it. |
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f*********r
发帖数: 10 | 10 quench会改变fluorephore的quantum yield,如果要准确计算FRET你需要知道QY到底被
该变了多少。如果是定性估计，也许可以估计个QY的值。
Chem. Rev. 2006, 106, 1785-1813， 是个不错的review,公式12，13 calculate the
correction of FRET. |
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A*****t
发帖数: 195 | 11 读会计用什么牌子的financial calculator 比较好?
请指教.
谢谢. |
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f*****0
发帖数: 489 | 12 there is only one finance calculator: 12c.
anything else is a waste of your time and money. |
|
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l********p
发帖数: 1234 | 14 想买TI-84 graphing calculator , 发现都在1００多 dollars， 那里有deal for
cheap one?
thank you everyone for this advice. |
|
n****0
发帖数: 696 | 15 If I have a solution of multiple components (CsCl, MgCl2, CaCl2, Hepes-Tris,
EGTA and sorbitol) and I know their concentrations (mmol/L), how to
calculate its somolality (mmol/kg)?
Thank you so much. |
|
J*******3
发帖数: 1651 | 16 How to test pseudopotential before carry out any calculation?
When we use our own basis, how to test the basis generated by user which
are good or not?
When we devise a model, first thing we need do is to optimize structure?
tons of thanks! |
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U**R
发帖数: 400 | 17 My ZIndo calculation gives me the excitation energies. I know experimentally
the S1-->S0 energy. So, should I shift all the excitation energies, or
should I scale them? |
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w*******a
发帖数: 105 | 18 报了FE考试。今天收到ELSES的确认信，信中列了允许使用的三种计算器，包括casio,
Hewlett Packard, Texas Instruments. 我现在的计算器时Senario Model SC-110, 功
能比简单的一种。 ELSES的信中强调，"Only the models of calculators listed
below may be brought into the exam room. Examinees with any other model or
variation will be dismissed from the exam."
请问我是否得重新买一个计算器？我现在的计算器能用吗？谢谢！ |
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f*****n
发帖数: 140 | 19 Hp 33s
most engineers in my company use this calculator. |
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w********w
发帖数: 1550 | 20 hp is for professionals. check out the hp 35s. plus RPN requires less keys
for the same calculation. |
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t********y
发帖数: 47 | 21 I have an account on a SunOS server using sparc processor.
THe matrix is with 3000 row x 80000 cols,
I want to calculate A x B, and I think seperate A , B to two or more
sub matrix helps to speed up, since the server has multiple processors.
but how?
I don't have root account, just a normal user.
I tried multi-thread, it did work for 2 threads, but no improvement
for 3, 4... I believe a single process can only use 2 threads since
sparc processor or the system may have 2 CPU or 2 core for each bo |
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e*****r
发帖数: 1229 | 22 have worked on this for one week. Only limited progress even with help from
friends.
For a molecules, we have a series of vibrtational mode. How to calculate the
transition dipole derivative between excited states and ground staes
where n is an excited vibrational states and 0 is the ground state. \mu is
the dipole
operator.
With Gaussian 03, I can produce .fchk file. There is a section Dipole
derivative.
However, it is very difficult for me interprete these numbers. It looks that
i |
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b******n
发帖数: 23 | 23 i'd like to know if there is a free software to calculate similarity between
chemicals in database? Thanks! |
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w****g
发帖数: 44 | 24 Any body here developed the program for first-principles calculations ?
Such as DFT, HF ?
How are those programming compared to MD ? any books/other materials to
start with ?
Thanks |
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l********p
发帖数: 1234 | 25 想买TI-84 graphing calculator , 发现都在1００多 dollars， 那里有deal for
cheap one?
thank you everyone for this advice. |
|
n**f
发帖数: 121 | 26 Assume I have a n*k matrix G where n>k. And I know rank(G) = k. According to
matrix theory G'G has full-rank and its inverse can be calculated. However
when I plug in the data to a numerical software, the software actually
complained that G'G is singular. For my problem, k is between 100 ~ 1000,
and
n is between 500 and 5000.
I manually wrote a C++ Gauss Elimination algorithm to verify that G'G has
rank
of k. But I notice that the Gauss Elimination algorithm would report the
matrix as singular... 阅读全帖 |
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t***s
发帖数: 4666 | 27 rule #1 in matrix computation, avoid calculating inverse explicitly at
all expense. use QR or SVD.
to
However
zero |
|
w*****1
发帖数: 473 | 28 【 以下文字转载自 Statistics 讨论区 】
发信人: wz99331 (dotti), 信区: Statistics
标 题: How to use sas to calculate the power of logistic regressi
发信站: BBS 未名空间站 (Tue Nov 4 11:28:25 2014, 美东)
To generate the statement like "given the sample size we have a %90 chance
of detecting an x percent or some unit difference of incidence of heart
defect between high fat and normal diet group at a p value of 0.05. the
sample size for high fat is 516, for normal diet is 2262. Could anyone help
me? Thanks a lot! |
|
m****d
发帖数: 331 | 29 【 以下文字转载自 Statistics 讨论区 】
发信人: madrid (马甲), 信区: Statistics
标 题: Can we calculate log likelihood ratio using SAS???
发信站: BBS 未名空间站 (Fri May 30 14:07:01 2008)
My model is a constrained regression ( a linear regression model with
inequality constraints)...Thank you. |
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s***e
发帖数: 830 | 30 不做计量，做numerical calculation，比如计算一个方程的解，或者maximize一个方
程。 |
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h******v
发帖数: 30 | 31 Hi, I am thinking about building a personal radio station targetting at 100
meters transmitting range received using a standard AM broadcast receiver(le
t's assume the Noise Limited Sensitivity of the receiver NLS=30 uV). The fre
quency is 10 MHz, the effective length of the antenna is 1 meter. How much p
ower should be transmitted? How to calculate it?
Thank you. |
|
s******e
发帖数: 2181 | 32 Can anybody give some links to show how to calculate the amplification of
op07? |
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a******e
发帖数: 80 | 33 我用的Cadence 5.10，但我想我问的问题应该试用于各个版本
我已经用cadence做好了仿真，现在想把一条具体的电压曲线的仿真数据export出来，
然后用matlab画图。
因为curve的数据量很大，含有很多points。如果我用传统的方法，就是点calculator
上的“tabular results display”（如果是cadence IC4.46，就是点“printvs”），
然后会生成一个table，然后再把table里的数据save as成csv。但因为数据点太多，
load到table里的时候要花太多的时间。
有没有办法能在ICW window直接输入一个command，指定待导出node名和目标文件名，
直接生成一个csv或txt file。我记得是可以的，但忘记具体格式了
谢谢。 |
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c****s
发帖数: 2487 | 34 下面的可以用来打印transient数据，其他的你再自己研究吧
openResults("<.psf file>")
results()
selectResults('tran)
outputs
ocnPrint(?output "" ?from ?to ?step
size> v("") ?numberNotation 'none)
calculator |
|
f*******w
发帖数: 1243 | 35 Why the interference power is usually calculated by the power sum of the
individual signals
rather than the power of the signals sum? |
|
p**r
发帖数: 488 | 36 Darcy Law, which calculates the pressure drop for flow through porous meida,
and the pressure drop multiple the section area gives you the force. |
|
o*********e
发帖数: 9 | 37 Is there anyone who knows where to find the standard DIN 45631, which is for
calculating loudness of sounds?
Thanks. |
|
M*******n
发帖数: 508 | 38 DNA molecule in solution, when centrifuging,
how to calculate the centrifugal force each molecule feel?
could anyone give me some advice? |
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s***e
发帖数: 911 | 39 I'll post my calculation here soon. |
|
i******l
发帖数: 3 | 40 Dear folks:
Who could tell me how to calculate the Tg of Block copolymer? It seems there
is a formula to describe that, which I totally forgot. I will be highly
appreciate it if you could tell me that.
Thanks |
|
C***S
发帖数: 175 | 41 Any software or programme suggested?
I am trying to calculate some SAXS profile for polymer. I guess there should
be something ready for this work. I am totally green on this, any suggestions
are welcome.
Thanks! |
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o********e
发帖数: 34 | 42 If it is amorphous polymer matrix, things will be very difficult.
Typically, unless you have a nice model, it is very difficult to obtain
a quantitative result.
I am not sure why you want to use SAXS to characterize your system.
I hope you still have some characteristic feature in your results which can be
linked
to the problem you want solve.
As far as I konw, unless you have already known the detail structure of
an amorphous system, it is almost impossible to quatitatively calculate
the scatte |
|
b*******n
发帖数: 29 | 43 I remembered that SiO2- amorphous polymer composites were well investigated
by SAXS or SANS in literature. What they need to calculate SLDs of polymers
are density and formula.
Most of classic models can deal with shapes including spheres (3D), plates
(2D)
and rods (1 D). 2.X D object is descriped as between shpere and plate. And
so on. SEM, TEM are always used to confirm the final shape.
the |
|
o********e
发帖数: 34 | 44 If you care about the shape of the bigger aggregated particles, scattering is
good at it. However, it also depends on the sample you use.
Again, for dilute conditions, the form factor of a particle can be very
accuratly caculated.
calculating |
|
o********e
发帖数: 34 | 45 Are these clusters embeded in a solid matrix?
If you can dissolve these cluster in some solvent with low volume
fraction(dilute condition), it will be much easier
to calculate the form factor.
the |
|
C***S
发帖数: 175 | 46 Yes.
I am working on NMR and we find the model of Nafion is somewhat
not in detail enough. And we think the clusters in Nafion is somewhat
not in spherical. So, we want to find a computation method to calculate
the SAXS profile and compare with the experimental SAXS data.
Now what I am looking for is to generate some geometry model, say cylinders
ditributed in space, and computate the profile.
I do not want to generate the atomic level accuracy. |
|
l***u
发帖数: 1 | 47 1. Fourier Inversion Theorem
Th: If \int_{-\inf}^{\inf} \abs(g_{X}(t))dt <\inf, then X is absolutely
continuous with density
f(x)=1/(2*pi) \int_{\-inf}^{\inf} exp(-itx) g(t)dt
2. The Ch. f. of Laplace distribution, which has density is 1/2*exp(-\abs(x)),
is
g(t)=1/(1+t^2)
This is easy to verify by standard calculation.
3. So, by Fourier Inversion Theorem,
1/2*exp(-\abs(x))=1/(2*pi) \int_{\-inf}^{\inf} exp(-itx)*1/(1+t^2) dt
=1/(2*pi) \int_{\-inf}^{\inf} exp(itx)*1/(1+t^2) dt
|
|
b******n
发帖数: 147 | 48 Anybody has any idea? Also do you know how to calculate sum of (1/i)^k where
i is from 1 to n? Thanks a lot.... |
|
c*********n
发帖数: 128 | 49 g(z) = \int_0^z f(x)(z-x)^{\alpha-1} dx
where f(x) is given, say ln(x), and 0 < \alpha < 1
how to calculate dg/dz?
Thanks a lot! |
|
c*********n
发帖数: 128 | 50 【 以下文字转载自 Physics 讨论区 】
发信人: chamberlain (PKU|PHY01|面朝大海|春暖花开), 信区: Physics
标 题: Re: How to calculate this derivative? (转载)
发信站: BBS 未名空间站 (Wed Dec 5 15:20:21 2007)
The original problem is to solve \phi(t) from
\int_0^z\phi(t) = \int_0^z f(x)(z-x)^{a-1} dx
where 0< a <1
I solved it in a general Laplace transform manner.
Perform Laplace transforms on both sides:
L[\int_0^z\phi(t)]
= 1/w L[\phi(t)]
L[ \int_0^z f(x)(z-x)^{a-1} dx ] (convolution)
= L[ x^{a-1} ] L[ f(x) ]
= w^{-a}\Gamma |
|
