发帖数: 1 | 1 International Tower Hill Mines Ltd. (THM)
0.59 +0.009 (+1.55%) @ close: September 15
我注意到THM这个股票，是因为看到Paulson & Co重仓。截至Jun 29 2017，Paulson &
Company, Inc一共持有55,487,842股，占总股数的34.17%。Paulson总共投了$26.6m，
成为THM的第一大股东。
公开的记录显示，过去两年里，Paulson一直在抛卖公司持有的各种股票，却单单在
2016年12月花了$15.6m，加持了32.43M @ $0.48。显然是看好THM公司的金矿资产价值。
不了解John Paulson其人的，可以看看这个：
https://en.wikipedia.org/wiki/Paulson_%26_Co.
当然了，THM只是Paulson许多投资中的一个，我之所以专门挑出这个来讲，不仅仅是超
重仓，也是因为看好金价接下来十几年的走势。如果从十年的时间跨度上估评各种货币，
未来的价值在 gold & crypto，而不是Dollar和RMB。... 阅读全帖 |
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t**********s
发帖数: 2968 | 2
&
值。
THM 这种加拿大BC的矿股，基本是骗子，说不定是一些逃到温哥华贪官搞的，贪官奸
商心多毒啊？让我们给他们抬轿子吗？现在投资金矿，利益可能永远收不回来。投入的
没有产出的利益多，矿周围环境非常恶劣，矿业又受各种政策税务环保当地原著民利益
的影响，动辄关门，就是个赔本买卖！这种股，很容易delist .
楼主啥意思？？居心叵测？或者是我猜错了？
这种股散户玩不起。 |
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l*****e
发帖数: 65 | 3
补充:
The book 'Special Functions' by Andrews, Askey and Roy.
page 253 All proofs are simple, easy to understand.
thm 5.4.1:Suppose that {Pn(x)} is a sequence of orthogonal polynomials w.r.t.
the distribution d\alpha(x) on the interval [a,b]. Then Pn(x) has n simple
zeros in [a,b].
remark: all roots are real. and no multiple roots. very very nice.
Thm 5.4.2 The zeros of Pn(x) and P_{n+1}(x) separate each other.
remark: in other words, the zeros interlace( 交错)
Thm 5.4.3 Let m |
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l***a
发帖数: 198 | 4 原文链接：
http://blog.sciencenet.cn/blog-268546-1032332.html
前不久，网络和朋友圈上一条消息刷屏，说中国在核能应用技术上取得重大突破，并且
“太过先进，无法展示”。这项技术叫做加速器驱动次临界系统（ADS），我以前关注
过，利弊略有了解，知道它还很不成熟，离实际应用很远。刚看到这条消息的第一反应
是，又有人搞笑了吧？仔细看过这条消息和很多评论之后，感觉非常不舒服。
先简单介绍一些相关概念：
加速器驱动次临界系统（ADS）：
目前说到核能一般是裂变核能。只要有中子，就能诱发裂变（自发裂变的可能性很低）
。一般反应堆依靠自己裂变产生的中子临界运行，依靠控制裂变燃料的浓度，几何形状
等，保证用掉一个中子正好产生出一个可以再次引起裂变的中子。如果不小心多了一点
，中子就会越来越多，导致反应失控，这就是超临界。一般还利用温度高低，气泡多少
，控制棒等，控制链式反应。但一般临界到超临界的余量很小。次临界系统就是不到临
界状态运行，一次裂变产生的有效下一代中子数少于1，能够保证反应堆不超临界。但
这样，裂变反应无法自持，因此需要一个比较大的中子源提... 阅读全帖 |
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M********t
发帖数: 163 | 5 Did you see the math questions they posted earlier?
For the math part I suggest:
1 Radon-Nicodym thm and prove
2 Arzela-Ascoli thm and prove
3 Rieze Representation and prove
4 WLLN/SLLN/CLT
5 strong/weak/a.e/in prob/in distribution/convergence |
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D******4
发帖数: 47 | 6 下周有个电话面试，是Emerging Markets Strategy 组的。在版上查询只找到一个贴有
相关信
息：
（Thanks for MidStudent）
For the math part I suggest:
1 Radon-Nicodym thm and prove
2 Arzela-Ascoli thm and prove
3 Rieze Representation and prove
4 WLLN/SLLN/CLT
5 strong/weak/a.e/in prob/in distribution/convergence
不知道版上牛人能提供一些他家的面试经验吗？ 不甚感激 |
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C******n
发帖数: 9204 | 7 大家都是在通往真理的路上。搞点breakthrough都是以10年为单位计算的，病态的创造
力。
从equity和fixed-income (US treasury, corp bond) 来看，general lesson是2-3个
shock可以pick up 大概90%的波动。但如果你impose一个param model，三个就不够了
。 3-factor affine/quad TS model表现很糟糕。但这不完全是个数的问题。
所以在我看来completeness问题只有理论意义，没有实际意义。由于人是很复杂的，所
以潜在的，你就是搞17个因素都不够，但empirically主要因素也没几个。
recovery thm那个定理让我震精了。但用起来还是需要一些假设，并没有非常perfect
。但这个想法很nb，把之前的人都日了。
SDF encode了人的relative valuation。按照consumption-based的说法，应该是
marginal util的ratio(recovery them和Heston都是这么用的)。general lesson是人
... 阅读全帖 |
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w****n
发帖数: 113 | 8 素数里有无穷多3-term AP和Vinogradov 1937年证明的奇数Goldbach猜想基本上是一回
事。过了六十多年才有了k-term的Green-Tao Thm. |
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h*****1
发帖数: 7 | 9 原来也用这个 但有些东西过滤率不掉 比如三卤甲烷 thms
[在 laocat (猫老) 的大作中提到：]
:我家用这个 https://www.zerowater.com，超过6 就换芯
:但是我觉得过分了
:饭馆是玻璃瓶装水 |
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g*****5
发帖数: 91 | 10 一、概述
1.乏燃料管理策略
为了应对化石燃料的短缺和保证能源安全，核电因其清洁性和高能量密度而受到青
睐，进入了一个积极发展期，由此也带来了对核电站卸下的乏燃料进行有效管理的问题
。目前，对于乏燃料的管理，国际上主要有三种战略考虑：
其一是后处理战略。即对乏燃料中所含的96%的有用核燃料进行分离并回收利用，
裂变产物和次锕系元素固化后进行深地质层处置或进行分离嬗变，这是一种闭路核燃料
循环。其特点是铀资源利用率提高，减少了高放废物处置量并降低其毒性，但缺点是费
用可能较高，可生产高纯度的钚，有核扩散的风险。
其二是一次通过战略。即乏燃料经过冷却、包装后作为废物送入深地质层处置或长
期贮存，美国曾经支持此战略，但其最终处置场尤卡山项目碰到了困难，现在美国已转
向了后处理。该战略特点是费用可能较低，概念简单；无高纯钚产生，核扩散风险低。
但缺点是废物放射性及毒性高，延续时间长达几百万年；没有工业运行经验。
还有一种是观望战略，就是等等看。
2.后处理的优点和必要性
乏燃料后处理是我国早已确定的技术路线。1983年，国务院科技领导小组召开全国
专家论证会，经过对我国核电发展计划、国内外铀资... 阅读全帖 |
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S**Y
发帖数: 136 | 11 Given a set S of n distinct numbers and a positive integer k <= n. Determine
the k numbers in S that are closest to the median of S. Find an O(n) algori
thm
感觉不太可能
谁给讲讲? |
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a********h
发帖数: 819 | 14 instead of playing short-term options on GLD and SLV which needs perfect
timing,
I would suggest buying junior miners which have high leverage to gold and
silver prices.
for example, NG can be regarded as a long-term out-of-money call option on
gold prices, and it doesn't have expiration and time decay!
you can also look at THM or NAK which have similar properties.
It's still a high risk play, but risk reward profile definitely is much
better than naked options. |
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a********h
发帖数: 819 | 15 In gold, right now THM is good, it may follow NG's path. |
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w****r
发帖数: 245 | 16 大侠，分类都分好了，求神签
# Basic Materials, Agricultural Chemicals
AGU Agrium Inc.
AVD American Vanguard Corp.
CAGC China Agritech Inc.
CF CF Industries Holdings, Inc.
CGA China Green Agriculture, Inc.
CMP Compass Minerals International
COIN Converted Organics Inc.
IPI Intrepid Potash, Inc.
MON Monsanto Co.
MOS Mosaic Co.
NOEC New Oriental Energy & Chemical
POT Potas... 阅读全帖 |
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v****e
发帖数: 19471 | 17 10 years ago, the music industry tried to come out with its own music store
to confront pirated music sharing. they failed because they had only second
grade tech and product people. 6 years ago, Microsoft try to build it's own
music player and music store. it failed, because they did not have good hard
ware people, nor executive who understood the mindset of the music industry.
Apple is so far the only company who can unleash a new market the intersect
ion of industries. Given its geek culture,... 阅读全帖 |
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p*****x
发帖数: 670 | 18 多谢。
把 Market Cap 限制去掉后，又多发现几个垃圾股也在涨之前买了：FREE, HEB, STXS,
THM.
不过垃圾股不敢投入，百分比大，收益实在不值一提。 |
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O****N
发帖数: 1458 | 19 拼这个为什么不去试试THM
你难道不知道庄家都是几块钱的进的吗 |
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s*****8
发帖数: 147 | 20 买了几个股票，BABA， UCO，STO，THM,稳稳当当的都被套住了。看着SCO在一个礼拜内
从７０多涨到１００，就像看到大美女，哈喇子流了一地。。。。。。。 |
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Q********g
发帖数: 2465 | 21 区区3000万不到怎么能叫重仓
也就是相当于赌博而已
老炮儿输得起，你输得起吗？如果是3B， 那还有点意思 |
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r*******4
发帖数: 1484 | 23 哪里一直减持？ Paulson 超重仓VRX，陪了2b 后还在加仓。你跟他VRX好了，比TEVA
要好。 |
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m****r
发帖数: 5435 | 24
&
值。
有点意思。加入watch list。谢谢。 |
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b********y
发帖数: 19 | 25 There is a new openned one called Rainbow Child Development Center at 133-20
Avery Ave, Queens, NY 11355.
I remember it is said on their advertisement that they have infant toddeler
care. But you need to call thm to ask for the detail. I have just found
their website: http://www.rainbowchildlearning.com/index.php
Good Luck! |
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h****i
发帖数: 5308 | 27 先用EOS Utility把所有文件同步到电脑上，然后我就把CF卡的文件删了
现在发现上传的MVI文件全是不到100K的.thm文件
更悲催的是我尝试用文件恢复软件，根本检测不到相机，我也没有读卡器
怎么办怎么办 |
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h****i
发帖数: 5308 | 28 我每次都把相机直接连到计算机上传照片，默认用EOS Utility
但是经常视频只传了个很小的.thm文件，真正的视频大文件没有传
有人有这个情况么 |
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M*****e
发帖数: 11621 | 29 不学也没关系，学了理解深刻。
学统计要学概率，学概率要学measure theory, 学measure theory最好学点real
analysis之类的，学real analysis最好先学点简单的拓扑……子子孙孙无穷溃。
在哪一步开始取决于你的背景和学统计的目的。从概率开始的话，有些东西比如bayes'
thm 很容易推导。但缺点是一开始可能有点抽象。
有一本书，是我最喜欢的概率书，叫foundations of modern probability, 作者是
kallenberg, 那本书对我来说很难，我花个三个月死啃前几章，天天早饭晚饭都吃它，
连上厕所都用它擦pg, 最后终于能捏死蚂蚁了。 |
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n******t
发帖数: 4406 | 30 it is a good book, but with Java, it kills the purpose to learn these algori
thms. |
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p***c
发帖数: 2403 | 31 % 要斜体的
\newthorem{thm}{Theorem}
% 不要斜体的
\theoremstyle{definition}
\newtheorem{lem}{Lemma}
\newtheorem{rma}{Remark}
那个definition 还可以改成remark等等
自己看看效果
包子：） |
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r******o
发帖数: 122 | 32 Arrow-Debreu 证明一般均衡存在性与 Nash 在博士论文初次证明 Nash eq. 存在性的
精神相同，但是时序未必如你所说的 Nash 先而 A-D 后，请问你从那些文献做出这样
的论断？毕竟 A-D 那一脉人马的数学功底也有能力独立搞出证明。
另外，Nash 在他老师 Tucker 的建议下，引用 Kakutani Thm. 发了篇一页论文，
那篇论文有 abstract, 定义 Nash eq., 给了一个证明，最后暗讽 von Neumann
几句，引了几篇文献，一页内完成那么多事，真是大牛风范。
the
Von
fixed |
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l********u
发帖数: 823 | 34 A reply:
My recommendation would be to question the need of disinfection, especially
with chlorine, which has proven to form chlorinated organics or also called
DBP (Disinfection By Products). When EPA implemented the CWA in 1972 it
also set a standard for bacteria and everybody started to use chlorine, as
testing for residual chlorine is cheap. This however introduced chlorinated
organics, among them THM's (trihalomethanes) in our open water, used for
drinking water. EPA recognized the problem |
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a*****e
发帖数: 2503 | 35 I noticed that they said that some Presentation said that
ClO2 reacts only as oxidant so it will generate less THMs compared with Cl2.
Why? |
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f******n
发帖数: 176 | 36 suppose v(x)==C(constant) in \Omega_0, by last problem, v(x)is continuous in R
^3, then v(x)==C for all x in bdry of Omega. it is easy to check gradient v(x)
=0 (cf. section 4.9) in \Omega. by Thm 4.9.2,
max v(x), x\in Omega = max v(x), x in bdry of Omega = C, also true for min,
this follows that v(x)=C in Omega.
Hope that helps.
都
3 |
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g*********g
发帖数: 4 | 37 Good question!
global 1-1 holomorphic => nonvanishing derivative (Using Rouche thm)
On Complex plane, the converse is the Jacobian Conjecture. |
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x*****d
发帖数: 427 | 38 \label{eqn:haha}, \label{sec:haha}, \label{thm:haha}, ... |
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B********e
发帖数: 10014 | 39 if 1. on 1-dimension space
2. squre-integrable instead of integrable
then f(t) must be differentiable,by sobolev imbedding thm
otherwise it need further investigation though i intend to say no.
in any case it's not trival, not a stupid question;)
something |
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Q***5
发帖数: 994 | 40 来自主题: Mathematics版 - 问个随机题 Here is my understanding of Health's suggestion:
Suppose you can find such a f (to avoid some tech issue, let's just assume
without proof that f(t+B_t) is a martingale, instead of just local
martingale).
Let T be the first time that t+B_t hit either a or b, then by optional
sampling Thm, you have the equation:
E(f(T+B_T)) = f(0+B_0) = f(0)
On the other hand, let p = prob(\tau_a<\tau_b), so
E(f(T+B_T)) = p f(a) + (1-p)f(b)
From these two equations, you can solve for p.
You may use Ito's lemma to |
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Q***5
发帖数: 994 | 41 Here is one way to prove it, if we are allowed to use some other results
about Brownian motion:
Since B.M. is homogeneous, we only have to prove the conclusion at t = 0.
Proof by contradiction.
Let G(h) = (B(h)-B(0))/h
If the conclusion does not hold, then there a>0 and N>0, such that
prob(G(h)>-N)>0 for any 0
which means that with Prob>0 the Brownian motion B never goes below the line
x=-Nt
on the interval (0,a).
By Girsanov's Thm, W_t = B_t +Nt is a B.M. under an equivalent probability,
an |
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Q***5
发帖数: 994 | 42 For (1.3), you can pull a big gun: Radon-Nikodym Thm.
We know that m(A)< B p(A) for any open set. So for any Borel measuable set D
, if p(D) = 0, then D can be covered by a open set, which is of arbitrarily
small measure. As a result, m(D) is arbitarily small, there for m(D) = 0.
Hence m<=0, and h is Borel
measurable, L_1 w.r.t p.
You can prove that h is bounded by B a.e. w.r.t p: otherwise, there exists
delta>0, such that p(E)>0, where E = (h>B+delta), w |
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l******e
发帖数: 470 | 43 拜托graph minor thm是nonconstructive的。另外你不能说人家搞出来个算法就变成搞
算法的人，大家心理都清楚搞算法的community是哪个。而在这个问题上谁follow谁是
显然的。 |
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M*****d
发帖数: 100 | 44 The comment is reasonable.
Generally speaking, F_n->F cannot imply f_n->f.
If the pdf f_n is uniformly convergent, it is right. You can refer rudin's
principle of math analysis, thm 7.17 and example 7.5
The second is wrong.
Just my 2c.
N) |
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l******r
发帖数: 18699 | 45 Thanks for nice solution!
Just have a quick question. Is the Sobolev Imbedding theorem saying
||f||_sup<=constant||f||_soblev_norm ?
The sobolev norm of the eigenfunctions are usually depending on the
eigenvalues, which is an increasing sequence. So, it seems that directly
using Sobolev embedding thm cannot give us the desired result.
I agree with your first suggestion, mimick the SL theory to get the
conclusion. Thx! |
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B********e
发帖数: 10014 | 46 sobolev imbedding thm says, on whole space R^n, or on domain with nice
boundary, if we have a function with high enough sobolev order, say H^r, r>n
/2, then f is continuous and we have
||f|_sup <= C ||f||_{H^r}.
for 1-dim space, r=1 is good enough.
so you are right on that it's not enough to normalize eigenfunctions in L^2
norm.
see if your work needs to normalize the eigenfunctions in the configuration
functional space H^2 instead of L^2. Or at least in H^1.
if not so, i doubt about the conjec... 阅读全帖 |
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Q***5
发帖数: 994 | 47 =\int_0^1 (\int_0^t dW(s)) dt
Switching integration order to get
=\int_0^1 (\int_s^1 dt) dW(s)
=\int_0^1 (1-s) dW(s)
By Ito Isometry Thm, it is normally distributed with mean 0, var 1/3 |
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k*****y
发帖数: 744 | 48 问的是martingale representation thm? |
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