v****g
发帖数: 214 | 1 不要图方便，还是买这个吧。毕竟是3轴的，而且可以测0.1 MHz – 2500 MHz。
注意：这个不同于AMAZON上卖的那个！
Trifield® BroadBand 100XE Meter
Manufactured in the USA by AlphaLab, Inc.
The BroadBand Meter is a version of the Trifield ®Meter which has a
modified radio/microwave section. (The magnetic and electric sections are
identical to the Trifield Meter). The BroadBand Meter is preferred for
measuring the field near transmitter antennas to determine whether enough
output power is produced to attain a certain signal strength. The... 阅读全帖 |
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s********n
发帖数: 151 | 2 Google search John E Moulder about power line EMF (which is 60 Hz frequency)
.
Note the cell phone tower is different from power line, because it's high
frequency, 2.4GHz.
Radio Frequency is possible to cause cancer, but ultra-low EMF like that
ones generated by power lines are not possible to cause cancer. |
|
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e*****m
发帖数: 722 | 4 引用一下，有人买shield来遮挡smart meter
I could say this Smart Meter Shield Kit has greatly increased the quality of
my life and helped to avert possible harmful health effects. I was NOT
happy when our town mandated the installation of Smart Meters, since I am
very sensitive to EMF. Unfortunately, our meter is just outside our bedroom.
It wasn't long before I started having problems sleeping. Since I have Lyme
disease, the decrease in my sleep exacerbated my Lyme disease. Month after
month after years, my... 阅读全帖 |
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S*******n
发帖数: 1721 | 5 【 以下文字转载自 AutismCare 俱乐部 】
发信人: Seattlian (Seattleite), 信区: AutismCare
标 题: 第六届自闭症和阿斯伯格大会——理疗篇
发信站: BBS 未名空间站 (Sat Nov 5 12:49:22 2011, 美东)
总体感觉这个大会是非常商业化的，这些讲演人主要是卖书，卖仪器和卖服务。会场外
面是一个展览，卖书，卖仪器，卖药，卖服务。下面是我在会场实时记录的一些笔记。
当时要是录音或者录像一下就好了。http://www.usautism.org/tv/ 上有录像卖，整个大会是99刀，一个议题10刀。
1）Raun K. Kaufman 的主题讲演：自闭症革命: 给父母的突破性策略
www.autismtreatment.com Home of the Son-Rise program 1974
他的主要目的是给他们Son-Rise Program作广告，同时卖书和DVD。他说的有一个思想
比较有趣，就是在干预初期，和自闭儿童一起去疯，他还举例说他小时候经常一个人转
家里的盘子，一转就是几个小时，他妈妈就和他一起转。... 阅读全帖 |
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c****n
发帖数: 15245 | 6 有包子吗？
I did a quick comparison of LG F6 vs L70, hope attached photo might help.
Is it worth extra $30, I don't know...... I love both, but its your choice..
.
Following features are MISSING in L70 in comparison to F6
1. Faster Qualcomm CPU ( MSM8930 vs MSM8610 - both on dual core )
2. 960x540 ( actually, L70's 800x480 is NOT all that bad. Bigger text for me
)
3. 1.3mp front camera ( skype video.. but again, not that important to me)
4. NFC ( faster file exchange between phone and tablet. ISIS pa... 阅读全帖 |
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M*****8
发帖数: 17722 | 7 【 以下文字转载自 Quant 讨论区 】
发信人: JunkFood (忧伤的老板), 信区: Quant
标 题: Ex-SocGen Trader Found Guilty of Stealing Secrets
发信站: BBS 未名空间站 (Fri Nov 19 14:51:54 2010, 美东)
Ex-SocGen Trader Found Guilty of Stealing Secrets (Update1)
(Updates with sentencing date in second paragraph.)
By Patricia Hurtado and Bob Van Voris
Nov. 19 (Bloomberg) -- Former Societe Generale SA trader
Samarth Agrawal was found guilty of stealing trade secrets
related to the bank’s high-speed computer trading software.
A... 阅读全帖 |
|
c*****n
发帖数: 83 | 8 【 以下文字转载自 Quant 讨论区 】
发信人: cadison (cadison), 信区: Quant
标 题: 我有大量 quant 书籍，谁要？
发信站: BBS 未名空间站 (Wed Jan 26 20:25:00 2011, 美东)
在论坛上有很多地方需要包子，
可惜我现在才有 0.1 个伪币。
别人发包子时，由于我自己手慢总是领不到。
照这样的速度，猴年马月才有 10 个伪币。
所以在此用自己多年收藏的书籍向有包子的大牛们交换。
一个包子一本书。
有意者请发站内邮箱，注明要那些书，并附上邮箱地址，我收到包子后就发书。
以下是书籍目录：
active portfolio management.pdf
Advanced Analytical Models.pdf
Advanced Modelling in Finance Using Excel and VBA.pdf
Advances in Behavioral Finance II (Richard H. Thaler).pdf
Advances in Behavioral Finance Volume II.pdf... 阅读全帖 |
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m*****g
发帖数: 3029 | 9 做市商不能长期hold position.
他一旦收到一个卖家比如说1万股垃圾，他得马上找到一群买家愿意收这1万股垃圾。
原理很简单，但是这活不好干。
一个稳定的市场，有充足的流动性，做市商稳赚。
nyse一个公司股票只有一个做市商。比如facebook，只有一个做市商。
当交易者一面倒时，比如全是卖家，做市商必须提供流动性，只好买，
做市商会降低买价，但是做市商仍有可能会有很大的损失。
high frequency trader 抢时间差抢先两边fill order赚差价，是不公平的行为。
high frequency trader 不是hedge fund。
hedge fund交易方式多样无限制。
mutual fund是dumb money。只能买。
投行和hedge fund不一样。
high frequency trader通杀全部
一般情况下，投行和hedge fund一起杀mutual fund。
少数情况下，投行杀hedge fund或者hedge fund杀投行。
伦敦大鲨鱼事件就是hedge fund杀投行。
hedge fund也互杀。
小散只是被误伤。 |
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W***n
发帖数: 11530 | 10 China and Clinton Agree: Traders Should Pay for Canceled Orders
Eduard Gismatullin
Sam Mamudi
December 29, 2015 — 6:00 PM CST
Chinese securities regulators are preparing some of the world’s strictest
regulations on a trading practice at the heart of the global debate over
high-speed computerized markets.
The draft rules are designed to prevent traders from flooding exchanges with
orders they don’t fill by charging market participants fees for habitual
cancellations. The proposal, which could com... 阅读全帖 |
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d**y
发帖数: 32 | 11 请研究方向适合的站内联系
No1: A new active common mode EMI filter for switched mode PWM inverter fed
ac drives
Submitted to the Journal of Engineering, Computing and Architecture
ABSTRACT
This paper proposes a new active common mode electromagnetic interference (
EMI) filter for switched mode PWM Inverter applications. The proposed filter
is based on current sensing and compensation circuit which utilizes fast
transistor amplifier for current compensation. The amplifier is biased with
an isolated low voltag... 阅读全帖 |
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Z*******1
发帖数: 30 | 12 看了一个http://www.qesehmk.org/的数据分析，感觉没有什么希望了。自己去找了labor的2009年报和数据看了一下，发觉如果certified expired 的case是180天内没有file I-140不计算潜在的在VISA demand里面，那么也许EB2的排期会比较快。具体数据如下：
http://www.qesehmk.org/的数据分析：
-Month -- ROW(2&3) -- EBI(2&3) -- EBC(2&3) -- Monthly Total --- i140 Rcpts -
- i140 Cmpl
Oct-08 ------897 --------649 ---------156 ---------1,702 --------5,633 -----
--12,363
Nov-08 ------508 --------481 ----------83 ---------1,072 --------4,664 -----
--10,811
Dec-08 ------194 ---------87 ----------13 ----------... 阅读全帖 |
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j***h
发帖数: 4412 | 13 Earthquake detection systems can sound the alarm in the moments before a
big tremor strikes—time enough to save lives
Japan’s system, which went live in 2007, makes heavy use of personal
technology. Alerts go out not only on television and radio but through
special receivers in homes, offices and schools. Pop-up windows on
computers show a real-time map with the epicenter’s location and the
radiating seismic waves. A timer counts down to the shaking at your
location and highlights predicted inte... 阅读全帖 |
|
M*****8
发帖数: 17722 | 14 【 以下文字转载自 Quant 讨论区 】
发信人: JunkFood (忧伤的老板), 信区: Quant
标 题: Ex-SocGen Trader Found Guilty of Stealing Secrets
发信站: BBS 未名空间站 (Fri Nov 19 14:51:54 2010, 美东)
Ex-SocGen Trader Found Guilty of Stealing Secrets (Update1)
(Updates with sentencing date in second paragraph.)
By Patricia Hurtado and Bob Van Voris
Nov. 19 (Bloomberg) -- Former Societe Generale SA trader
Samarth Agrawal was found guilty of stealing trade secrets
related to the bank’s high-speed computer trading software.
A... 阅读全帖 |
|
j***h
发帖数: 4412 | 15 Earthquake detection systems can sound the alarm in the moments before a
big tremor strikes—time enough to save lives
Japan’s system, which went live in 2007, makes heavy use of personal
technology. Alerts go out not only on television and radio but through
special receivers in homes, offices and schools. Pop-up windows on
computers show a real-time map with the epicenter’s location and the
radiating seismic waves. A timer counts down to the shaking at your
location and highlights predicted inte... 阅读全帖 |
|
s***r
发帖数: 358 | 16 Thanks. 50lb for 3 months is not bad at all! Honestly I didn't anticipate
big PRs like these so it was definitely a surprise to me. The rate of
strength growth will most likely slow down a bit in the next few cycles.
I really like Mike T's auto regulation after 9 weeks of practicing it. It
auto regulates the volume, and is very effective in limiting the chance of
getting injured. I don't have to plan ahead for next session on how much
weight or percentage I need to lift. All I need is a ballpark... 阅读全帖 |
|
g*****h
发帖数: 642 | 17 来自主题: GunsAndGears版 - 泉盛对讲机 放狗搜了一下
FRS/GMRS hybrid radios in the United States
Motorola FV150 FRS and GMRS handheld radio
Hybrid FRS/GMRS consumer radios have been introduced that have 22 channels.
Many of these radios have been certified for unlicensed operation (on the 14
FRS frequencies, channels 1-14) under FRS rules.[1]
The FCC rules and statements regarding the use of hybrid radios on channels
1-7 stipulate the need for a GMRS license when operating under the rules
that apply to the GMRS. Many hybrid radios have an E... 阅读全帖 |
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k***a
发帖数: 335 | 18 THE STAR PHOENIX 今天发的一篇。回答了几个版上经常讨论的问题. Highlights:
-"Weight loss requires significant changes in intake and expenditure".
- "those who set ambitious goals often get better results.
- "our heredity and genetics are not our destiny. Anyone can lose weight"
-There has to be sufficient intensity and duration to accompany frequency
for one to lose weight.
- sticking with meal structuring, especially on weekends, is important to
greater weight loss.
***************************************************... 阅读全帖 |
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i*********5
发帖数: 19210 | 19 破三在本版已经开始普及开来了，但是在全程铁人赛里破三好像还没有人尝试过。Troy
教练的这篇文章就是讲他如何在４１岁时实现的这个目标。
http://www.coachtroy.com/public/605.cfm
How to Run a Sub 3-Hour (or YOUR PR) Ironman Marathon
Tips resulting from my Ironman AZ Experience
by Coach Troy Jacobson
What is your personal Mt. Everest? What big goal do you have on your 'bucket
list' that has been looming just slightly out of your reach for many years?
For me, it was running a sub 3 hour Ironman marathon. During a tri career
spanning over 20 years and 15 Ironman races... 阅读全帖 |
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l****q
发帖数: 177 | 20 说无责任转贴，是因为部分结论和多数人想的有点不一样，尽信书不如无书，还是看大
家的讨论
仅转贴摘要。要看全文见如下文档
http://www.nvwoa.nl/pdfart/ruis/ruisen.pdf
Abstract
In this study, hypotheses of astrologers about the predominance of specific
astrological factors in the birth charts of serial killers are tested. In
particular, Mutable signs (Gemini, Virgo, Sagittarius and Pisces), the 12th
principles (12th house, Pisces, Neptune) and specific Moon aspects are
expected to be frequent among serial killers as compared to the normal
population.A sample ... 阅读全帖 |
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a*******u
发帖数: 6324 | 21 好像是neumann U67用滴音头，然后后来大家照着仿制滴。
The K67 capsule, which since 1960 has become the most common and most copied
condenser capsule in the world, was designed to avoid the challenges and
costs of tuning the K47 so that both diaphragms produce identical frequency
responses. Unlike the K47, the K67 utilizes a two-piece backplate, allowing
the diaphragms to be tuned individually and then matched for equivalent
response.
A -10dB pad was incorporated, in response to the trend of placing
microphones closer... 阅读全帖 |
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q***q
发帖数: 3356 | 22 I think that's because of your sound card has bad
frequency response.
In plain Words, the sound channel it provides simply
ate up the low frequencies and high frequencies so that
the result is not so vivid as the original.
Another possible reason (which may make you a little
comfortable) is the speaker you are using -- a small
computer speaker? Then forget about the bass part. Try
to plug the output to your guitar amp to see the result. |
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k****t
发帖数: 12697 | 23 其实这跟物场SPATIAL FREQUENCY 有很大关系.
这测试图的点/物距刚好在340 ALONE 的RESOLUTION CUTOFF 之外, 所以340 ALONE
BLOWN UP 后看上去比1.4X, 2X 差多了. 但在340+1.4X RESOLUTION CUTOFF 之内, 所
以1.4X加插值看上去不比2x差.
假如把相机移远3米, 马上就看出1.4x加插值和2x的差别.当然那时SPATIAL FREQUENCY
在1.4X 的RESOLUTION CUTOFF 之外, 340 ALONE加插值 看上去会不比1.4x差太多.如果
有个图有两个点阵,FREQUENCY 一个在ALONE 和1.4X之间, 另一个在1.4X 和2X之间, 就
全看清了.
所以镜头测试毛腻太多.用啥图/物距有讲究. 如果两个镜头差不太大,在图DETAIL 不是
太多时CONTRAST 更重要, CONTRAST 大的一眼看去比较明快,比较讨好,RESOLUTION上的
差异反映在EDGE 是不是SHARP, 但不会"秒杀". 如果选一区有DETAIL 刚好在两个镜头
的RESOLUTI |
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G**Y
发帖数: 33224 | 24 ...
Candès can envision a long list of applications based on what he and his
colleagues have accomplished. He sees, for example, a future in which the
technique is used in more than MRI machines. Digital cameras, he explains,
gather huge amounts of information and then compress the images. But
compression, at least if CS is available, is a gigantic waste. If your
camera is going to record a vast amount of data only to throw away 90
percent of it when you compress, why not just save battery power... 阅读全帖 |
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s********e
发帖数: 11693 | 25 他们自己网站写的是10bit，ebay上没说
http://www.monoprice.com/Product?c_id=113&cp_id=11307&cs_id=113
Specifications
Display Type IPS panel with LED backlight
Display Size 27" (685mm)
Dot Pitch 0.2331 x 0.2331 mm
Maximum Resolution 2560 x 1440 @ 60Hz (WQXGA)
Brightness 440cd/m²
Color Space Support 1.07 billion colors
Response Time (gray-to-gray) 6 milliseconds
Dynamic Contrast Ratio 80,000:1 max
Viewing Angle 178° left/right, 178° up/down
Input Options VGA, DVI-D Du... 阅读全帖 |
|
g****g
发帖数: 1828 | 26 In probability theory, the normal (or Gaussian) distribution, is a
continuous probability distribution that is often used as a first
approximation to describe real-valued random variables that tend to cluster
around a single mean value. The graph of the associated probability density
function is “bell”-shaped, and is known as the Gaussian function or bell
curve:[nb 1]
f(x) = \tfrac{1}{\sqrt{2\pi\sigma^2}}\; e^{ -\frac{(x-\mu)^2}{2\sigma^2}
},
where parameter μ is the mean (location of the pe... 阅读全帖 |
|
l*****o
发帖数: 26631 | 27 Long-Term Health Risks and Benefits Associated with Spay / Neuter in Dogs
Laura J. Sanborn, M.S.
May 14, 2007
Precis
At some point, most of us with an interest in dogs will have to consider
whether or not to spay / neuter our pet. Tradition holds that the benefits
of doing so at an early age outweigh the risks. Often, tradition holds sway
in the decision-making process even after countervailing evidence has
accumulated.
Ms Sanborn has reviewed the veterinary medical literature in an exhaustive
a... 阅读全帖 |
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s**i
发帖数: 4448 | 28 Frequency of spontaneous regression in cancer
It has long been assumed that spontaneous regressions, let alone cures, from
cancer are rare phenomena, and that some forms of cancer are more prone to
unexpected courses (melanoma, neuroblastoma, lymphoma) than others (
carcinoma). Frequency was estimated to be about 1 in 100,000 cancers;[2]
however, in reality this ratio might be largely under- or overestimated. For
one, not all cases of spontaneous regression can be apprehended, either
because the... 阅读全帖 |
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l******o
发帖数: 2649 | 29 http://www.macrumors.com/2010/06/27/steve-jobs-on-iphone-4-signal-issue-stay-tuned/
还有rumor说周一可能会发布iOS 4.0.1
The fix is expected to address a issue in iOS 4 related to radio frequency
calibration of the baseband
Readers who saw the original forum discussions say that the issue is
believed to occur when switching frequencies; because the lag is allegedly
not calibrated correctly, it results in the device reporting "no service"
rather than switching to the frequency with the best signal to noise r |
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l******o
发帖数: 2649 | 30 不懂RF
但是是否如果手接触了之后
换一个frequency也许就好了？现在换得太慢？
或者有些情况下，有些地理位置，只有某个frequency信号较好，接触天线，就算软件
换frequency也没办法，就会drop call? |
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w********1
发帖数: 3492 | 31 Fri, 08 Jun 2012 11:31:54 PDT
Yesterday, 9to5Mac reported that an iPhone user running on T-Mobile's
network had observed the curious phenomenon of 3G connectivity showing up on
his device when in the immediate vicinity of the Moscone West convention
center where Apple is holding its Worldwide Developers Conference next week.
The user, who frequently passes by the convention center, had never seen
3G network support there before.
iPhone users on T-Mobile USA have historically been limited to th... 阅读全帖 |
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a****i
发帖数: 10 | 32 ah, meet somebody in crypto at last...
I don't know the answer, only some rough idea for reference:
if the modification doesn't change the frequency of the letters much, it won't
change the probability to find out the key much.
But what's probability when there's no modification? It depends on whether the
frequency of the letters matches the statistic frequency based on which the
cracking algorithm is designed. I guess it's possible to deduce a math
equations for it, but not sure how much time. |
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k**********g
发帖数: 989 | 33 Yes.
Fixed length, fixed interval, finite time (input N time samples, output N
frequency samples)
Time domain: (1) multiply by impulse train, (2) multiply by boxcar (finite
time)
<-->
Frequency domain: (1) convolve by impulse train (hence periodic 2*pi), (2)
convolve by sinc (hence it is allowed to interpolate the N frequency
responses by a sinc function)
有错请指正，谢
Edit: not sinc, should be "periodic sinc" (a ratio between two sinc)
http://www.mathworks.com/help/toolbox/signal/diric.html;jsessioni |
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m*********a
发帖数: 3299 | 34 AMD sempron 140 to Athon x2 4400e
Overclock to 3.6 Ghz
Successfully unlock 2 nd core
HT frequency 2.67 Ghz
Notherbridge frequency 2.67 Ghz
Ram frequency 1424 Mhz
Run very fast and have to get rid of the i7 rig |
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i****x
发帖数: 17565 | 35 你那个国内烂校学报的”科研“结论跟以下所有结论矛盾的时候，你说我们该信谁呢？
In 2006 a large Danish group's study about the connection between mobile
phone use and cancer incidence was published. It followed over 420,000
Danish citizens for 20 years and showed no increased risk of cancer.[21] A
2011 follow-up confirmed these findings.[22]
The following studies of long time exposure have been published:
The 13 nation INTERPHONE project – the largest study of its kind ever
undertaken – was published in 2011 and did not find a solid li... 阅读全帖 |
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B******u
发帖数: 209 | 36 【 以下文字转载自 JobHunting 讨论区 】
发信人: BeeBeeWu (BuzzBee), 信区: JobHunting
标 题: 关于java的疑惑
发信站: BBS 未名空间站 (Wed Oct 30 09:45:25 2013, 美东)
lz刚开始做的是JEE, 后来偶然去了做high frequency trading platform,java写的，
但是只做了一年多一点。 因为lg postdoc转ap就搬到其他地方去了。 新工作又做起了
JEE.
最近有个recruiter推荐了个high frequency trading platform的工作，我去面试了一
下，但是面的很糟糕。 这次的面试跟以前不一样，上次都是问写算法，数据结构的问
题，这次全都是java concurrency api和jvm performance tuning. 我写过
multithreaded的程序，但不是很多。 synchronized, volatile, atomic integer，
concurrenthashmap这些用过了就知道。 但是不知道synchroni... 阅读全帖 |
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z****e
发帖数: 2024 | 37 there is an exact solution.
I'm thinking the following.
say we have 10G phone numbers saved as files, but 500M memory. and we want the top 5 highest frequency.
then we can use brute force.
1. take one number from the file, scan the files to count the frequency of this number, finally save the number and its frequency as a pair in another file FFF.
2. repeat the above for all numbers in the 10G files. and our FFF will be appended until the last number is scanned.
for 1, and 2. the orginal 10G fil |
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e******o
发帖数: 1160 | 38 请教一下：
现在用audio class 1.0的spec，里面有用microphone的例子，但是里面只有一个sam
ple frequency，现在想再加一个sample frequency，这个descriptor应该怎么写？
根据106页的hierarch图，我是加一个altera interface吗？但是type I format的desc
riptor里面说可填写不同的sample frequency。
比较晕。。。
请有熟悉的人指定一下。。。 |
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i**e
发帖数: 91 | 39 RFID
(pronounced as separate letters) Short for radio frequency
identification, a technology similar in theory to bar code
identification. With RFID, the electromagnetic or electrostatic coupling
in the RF portion of the electromagnetic spectrum is used to transmit
signals. An RFID system consists of an antenna and a transceiver, which
read the radio frequency and transfer the information to a processing
device, and a transponder, or tag, which is an integrated circuit
containing the RF circuitr... 阅读全帖 |
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s*****0
发帖数: 357 | 40 You need sample sizes of those two populations to conduct a test. Just
comparing two groups of proportions will not generate reasonable statistical
results.
For example, if those frequencies are derived from samples of 100 subjects,
the Chi-square will give insignificant results (p>0.05); however, if those
frequencies are derived from 10000 underlying subjects, the p-value will be
extremely small.
Go back to the original source of those data, and you should be able to
obtain the sample size for ... 阅读全帖 |
|
w*****y
发帖数: 1201 | 41 如果frequency高的话，即使个别个体没有检测到，这个没有影响，可以通过
imputation获得，如果frequency低的话，必须有足够的覆盖来保证，一定数目的个体
可以检测到，frequency低的variant，imputation的准确性不高。
般来 |
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h**********3
发帖数: 427 | 42 帮忙查一下国内的一篇文章吧，谢谢了：
请发送到h**********[email protected]
Ab initio calculations of vibrational frequencies and structures of ion
pairs of perchlorate. Xuan, Xiao-peng; Xie, You-hai; Zhao, Yang.
School of Chemical and Environmental Sciences, Henan Normal University,
Xinxiang, Peop. Rep. China. Guangpuxue Yu Guangpu Fenxi (2010), 30(9),
2537-2540. Publisher: Beijing Daxue Chubanshe, CODEN: GYGFED ISSN: 1000
-0593. Journal written in Chinese. CAN 153:369826 AN 2010:1137884 ... 阅读全帖 |
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j***h
发帖数: 4412 | 43 Earthquake detection systems can sound the alarm in the moments before a
big tremor strikes—time enough to save lives
Japan’s system, which went live in 2007, makes heavy use of personal
technology. Alerts go out not only on television and radio but through
special receivers in homes, offices and schools. Pop-up windows on
computers show a real-time map with the epicenter’s location and the
radiating seismic waves. A timer counts down to the shaking at your
location and highlights predicted inte... 阅读全帖 |
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z*r
发帖数: 9 | 44 You can say it's the same term, for a grating with
period a, illuminated by incident coherent beam, then
the diffracted light has the frequency cos(sita)/lambda,
but a*cos(sita)=m*lambda according to grating theorem,so
the frequency could also be represented as m/a, which is
the fouriers series's each order's frequency in
"image processing", so we can see in physical optics and
image science, the two term is actually equivalent. |
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