c******k 发帖数: 1140 | 1 想买ITO coated glass substrate, 无论是买商业产品还是自己镀膜,没经验不知道镀
多厚,ITO作为电极用。
我们的应用是电阻值不考虑,下面是商业产品的镀膜厚度及相应的电阻值,
70-100 ohms (15-30 nm);
30-60 ohms (30-60 nm);
15-30 ohms (60-100 nm);
8-12 ohms (120-160 nm);
ITO薄的便宜,但是不清楚15~30nm 的ITO 适合做电极吗,要直接连接电线的。买哪种
合适?谢谢 |
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T********k 发帖数: 94 | 2 i have some experience on e-beam ito coating.
A company uses e-beam method to coat ITO on a 1x6 mm device, estimated
thickness 0.15micron. I measured resistance by two probes of a multimeter.
sometimes, I got ~ 100ohm, sometimes, I got much higher resistance.I do not know how uniform your coating is? What is the thickness of your coating?
Other observations:
I f you did not clean the target substrate well, the coating might flake off.
The coating sometimes looks yellowish, sometimes transparent.... 阅读全帖 |
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c*********g 发帖数: 154 | 3 啊,不好意思理解错你的意思了。你是先定义ito integral,那么X_0当然是等于0。但
是我不记得如何取d(X_t)了。直接用ito lemma不知道行不行,用ito lemma的要求是G(
t,Y_t)中的G是二次连续可导的函数。这里int_0^t f(s,B_s) dB_s不知道是否二次连续
可导。嗯,还需要继续学习。。。
反过来如果先有导数d(X_t)=f(t,B_t)dB_t,那么X_t = X_0 + int_0^t f(s,B_s) dB_s
。这就是我之前说X_0不一定等于0的原因,是我理解错你先定义哪个了。 |
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q*****o 发帖数: 438 | 5 Moon 31岁了,金泽洙柳承敏式的单面拉,4:2胜伊藤。两年未在国际赛露面了。是赢
过王楠的那位?
Absent from the international scene for almost two years, her most recent
appearance being at the GAC Group 2013 ITTF World Tour Japan Open, when
beaten in the final by the host nation’s Ai Fukuhara; Korea’s Moon
Hyunjung was the player to upset the seeding in the second round of the
Women’s Singles event at the GAC Group 2015 ITTF World Tour Australia Open
in Tweed Heads on Friday 5th June.
The 31 year old accounted for Japan’s 14 year old Mima... 阅读全帖 |
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m******r 发帖数: 2950 | 7 现在用的普通ITO glass slide 做电极,请问哪里可以买到ultra smooth的。看到有人
用nanostructed的ITO, 是Asashi Beer Optical Ltd的, 可是怎么查不到公司或是代
理的信息呢。请知道的同学说一下。谢谢。 |
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j********1 发帖数: 628 | 8 ITO , especially sputtered one, dissovles in acids. If your acid can remove
ZnO, most likely it will remove some underlying ITO. You can check this by
compare sheet resistance. |
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b***k 发帖数: 2673 | 12 suppose ito integral: int_0^t f(s,B_s) dB_s = X_t
那么这个X_t具备什么特别的性质吗?
比如X_t是martingale吗? E[X_t]=0?
我觉得对X_t做ito lemma有
d(X_t)=f(t,B_t)dB_t (no drift term)
可是又不是很肯定,如何解释这个结果?
请大拿出来帮我理理思路,多谢了.呵呵 |
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M****i 发帖数: 58 | 13 I don't think that this integral can be computed explicitely, but another
form can be given by using Meyer-Ito formula (P214,Th 6.22 in GTM113 by
Karatzas & Shreve). For this, assume that B_0 = 0, choose f(x) = max{x,0} in
Meyer-Ito formula and observe that the left derivative of f is 1_{x>0}.
Hence
int_0^t 1_{B_s>0}dB_s = max{B_t,0} - L_t(0)/2, where L_t(0) is the Brownian
local time at 0. For your integral, it suffices to choose t = 1. |
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发帖数: 1 | 16 菌斑除了我,还有谁懂 Ito calculus,随机过程的基础 |
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d********m 发帖数: 3662 | 18 ito也就是stochastic process里难度相对高点的部分
总体不算太难的东西 |
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k*******p 发帖数: 8821 | 19 你海归深圳了。知道深圳哪些地方嫖娼最容易,不会被抓,不会仙人跳,价格还公道吗
?先知道这些再谈Ito calculus。 |
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发帖数: 1 | 20 WTO是世界贸易组织的简称,这个组织一直致力于世界的贸易公平和减少贸易壁垒。中
国曾经花费了大量的时间,为了加入这个组织。加入WTO后,中国的对外贸易量获得了
巨大的增长,中国也成为了世界工厂。
WTO本来是欧美国家率先倡导并且成立的一个组织,不过,随着川普的贸易孤立主义的
盛行。美国未来很有可能退出这一组织。美国官员甚至威胁WTO开除中国,如果不这样
的话,美国就退出。
而WTO前总干事拉米的陈述说明了WTO的态度,那就是如果美国退出就退出好了,剩下的
国家可以组成ITO。 |
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p*******0 发帖数: 31 | 21 我们是一家高科技STARTUP 公司, 主要生产和经营旋转靶材特别是AZO和ITO旋转靶材。
公司已经运营两年,运营良好。我们正在寻找在靶材研发生产领域有丰富经验的旋转
靶材生工程师加盟。有兴趣者站内信箱联
系或c********[email protected] |
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l*w 发帖数: 567 | 22 mima ito还是小,一碰到情况变了就蒙圈了。 |
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b**n 发帖数: 289 | 23 我想解两个Ito Stochastic Differential Equations,但最简单的Euler方法不行。听
说了一种Stochastic Runge-Kutta方法,不知道哪一位有没有相关的经验。因为我
GOOGLE了一下,没有GOOGLE到。图书馆里原本有一本NUMERICAL METHODS FOR SDE的,
但被借出了。请教,多谢。 |
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e***t 发帖数: 14386 | 24 【 以下文字转载自 Quant 讨论区 】
发信人: emsct (姑苏), 信区: Quant
标 题: Ito Kiyoshi died on Nov 10 2008
发信站: BBS 未名空间站 (Fri Nov 21 00:01:02 2008), 站内
r.i.p. |
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j*******8 发帖数: 4 | 25 想要wet etch 在玻璃上的ITO,etchant 应该是HCl, 但不知道具体与H2O的比率是多少
?etching rate 是多少?温度有没有限制?是否也etch玻璃.
如果大侠有更好的recipe就更好了.
谢谢 |
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j********1 发帖数: 628 | 26 My experience is that it takes about 15-20 minutes to etch away (determined
by conductivity) 150 nm ITO (sputtered) film at room temperature with
diluted HCl (10%). HCl does not etch glass. |
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c********2 发帖数: 361 | 27 50% HCl plus Zn powder, etch off ITO in minutes |
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m******e 发帖数: 432 | 28 做光伏电池可否在ITO上度层金属薄膜,然后再生长TiO2呢?如果可以,有什么利弊?
谢谢指教! |
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l*******s 发帖数: 65 | 29 I suppose you are talking about growing TiO2 nanotube on ITO substrate. C.
Grimes at PSU did some work on this.The advantage is incident light can
directly reach the active layer in a front-side illumination mode. However,
it is hard to deposit thick Ti on substrate with high quality, which is very
important for the formation of TiO2 NT; also, after anodization and
annealing, the contact between TiO2 NT and substrate might be a problem.
It is also possible to use hydrothermal approach to grow T |
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l*****l 发帖数: 85 | 30 It would be very interesting if you can grow TiO2 NT directly on ITO from a
hydrothermal process. |
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m******e 发帖数: 432 | 31 ITO上的ZnO用酸洗掉后,再超声波一下,可否去掉残余的微小颗粒。上次没有超声波,
残余的颗粒在接着晶体生长的时候作为结晶核,得到一些副产物。这次准备超声波一下
,不知道效果怎样? |
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r*****t 发帖数: 286 | 32 ☆─────────────────────────────────────☆
KuangTer (KuangTer=Quant) 于 (Sun Apr 15 16:26:33 2007) 提到:
We know:
X(t) = 1 + I[sigma*(X(s)^0.5)]dW(s) + bt, and tao = inf{t: X(t)=0}
Sorry, I can't type integral notation, so I use the "I[f(s)]dW(s)" in the
formula to denote Ito integral for function f(s) from 0 to t.
Question is:
Give necessary and sufficient conditions on sigma and b>0, such that P{tao<
infinite}>0
Can anyone help to calculate it, thank you!
My answer is 0<2b/(sigma^2)<1, is it ri |
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K******r 发帖数: 152 | 33 Let x(t,W) satisfies the following SDE:
dx = a(t,x)dt + b(t,x)dW
where W is standard brownian motion.
If G(t,x) = int(0,t)[x(s,W)]ds
int(0,t) denotes the integral from time 0 to time t.
Then what is the SDE for G(t,x) using Ito's Lemma?
Thank you! |
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d*j 发帖数: 13780 | 34 normal
mean is 0, var is t^3/3
is this OK ?
by Ito Isometry |
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t*******e 发帖数: 172 | 35 You need to carefully think about what is Ito integral...
after your do some integral, you get a R.V. if you know the distribution,
then you definitely know the R.V. , what eles do you want?
In your e.g. you actually get a R.V is 1/2 (X^{2}-T) where X is a N.R.V with
mean 0 variance T. If you want you can write X as W_{T}, but what is the
difference? |
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t**********a 发帖数: 166 | 36 No, I think you probably need to think about what solution Ito's integral is
. I think iz is looking for a strong
solution - like path-wise... The distribution is not even a week solution....
Imagine, a rv with same distribution can live in a totally different
probability space.
with |
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o****e 发帖数: 80 | 37 这个integral为什么是 normal distribution?
by Ito isometry, 只能得到 mean=0, variance=t^3/3阿 |
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o****e 发帖数: 80 | 38 X(t)=W(t) and Y (t) = int_0_t{W(s)}ds.
if X(t)Y(t) = \int_0^t W(s)^2ds + \int_0^tY(t)dW(t)
E[X(t)Y(t)] =E[ \int_0^t W(s)^2ds + \int_0^tY(t)dW(t) ]
=\int_0^t E[W(s)^2] ds + \int_0^t E[Y(t)] dW(t) ???? 这一步对吗?根据什么
定理?好像不是 ito isometry把? |
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t********t 发帖数: 1264 | 39 you can work this out by either Fubini theorem or Ito isometry.
The result is t^2/2 |
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r*******y 发帖数: 290 | 40 how to work out using ito isometry? |
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j*****4 发帖数: 292 | 41 yes,this method leads to a more complex track.
The following is what I did:
E(int_t^0 W_s dW_s)^2
=1/4 E(W_t^2-t)^2
=1/4 E(W_t^4-2tW_t^2+t^2)
recall that
E(W_t^2)=t
E(W_t^4)=3t^2( ...=E(int_t^0 d(W_s^4)) then use Ito lemma)
so the answer is t^2/2. |
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h*y 发帖数: 1289 | 42 just wanna provide an idea, not a proof.
My thought is the B_s in f() is taken at beginning of any time interval (Ito
Calculus) which is independent of dB_s.
,我发个截图过去。 |
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a*******h 发帖数: 123 | 43 As long as f( ) is a (Borel-) measurable function, f(s, B_s) has to be an
adapted process and thus X_t is an Ito process, implying that it is a
martingale. |
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a******u 发帖数: 66 | 44 integration from 0 to T of W(t)dt等于多少?我杀鸡用牛刀试图用ito lemma做,怎
么也绕不出来,555555555
哪个大虾指点以下?谢谢! |
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d*j 发帖数: 13780 | 45 ft
人家问的是怎么做的 不是结果。。。。。。
apply Ito's lemma on t*W_t |
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z****i 发帖数: 406 | 46 哦。。我以为他想把它积出来。。。
可以不一定用ito lemma啊,因为被积函数是Ws, 所以这个东西是normal的,所以只要
知道mean和variance。 mean直接是0。variance写成二重积分。
是这么做的吧? |
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a******u 发帖数: 66 | 47 用ito lemma,let
I(t)=int_0^t w_s ds
then dI(t)=w_t dt, therefore drift term is not zero. Hence not margingale. |
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J**********g 发帖数: 213 | 48 I doubt it has an explicit expression for the ito integral.
It's clear that it equals to
\int_0^1 I_{B_t>0}dB_t (*)
but I don't know how to keep going. I might be wrong, but there might not be
an explicit expression for (*). |
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s*****e 发帖数: 20 | 49 问题:
Let u(x) = 1/d(R^2 - X^2), W_t a d-dimensional wiener process.
By applying Ito's formula to show that
u(W_t) = -t - /int_0^t (2/d)W_s dW_s +(1/d)R^2 |
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