b******g
发帖数: 3616 | 1 我的理解，clarity的效果类似大radius/小amount的unmask/smart sharpen。效果是增
强轮廓锐度而并非细节锐度。
Clarity之所以稍微拉大一点就会产生halo，原因就像我文章中说的，当sharpen的
radius比较大的时候，只要amount稍微大一点，马上就出现各种artifacts. |
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r****n
发帖数: 8253 | 2 Dehmelt, Hans, A Single Atomic Particle Forever Floating at Rest in Free
Space: New Value for Electron Radius, Physica Scripta. 1988, T22: pp. 102-
110, doi:10.1088/0031-8949/1988/T22/016
↑
从观测束缚于潘宁阱（英语：Penning trap）内的电子而得到的实验结果，物理学家推
断电子半径的上限为10−22米
================
经典电子半径（英语：classical electron radius）是2.8179 × 10-15。这个结果是
从经典电动力学和狭义相对论的理论推论出来的，并没有使用到任何量子力学理论
=================
1988年的论文，说根据实验得到结果，电子的上限是10−22米，这个小于丁60年代的的实验精度。
（http://zh.wikipedia.org/zh-cn/%E5%BC%A6%E7%90%86%E8%AB%... 阅读全帖 |
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s*****g
发帖数: 1055 | 3 Probably not, EAP-TLS/TTLS requires back end Radius server which has
authenticator (the legal autonomous AP or LWAPP controller) as trusted client, when your wireless client tries to associate with the repeater/bridge, the repeater/bridge will not understand EAP packets from client, nor can it exchange authentication messages with back end Radius server. |
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s*****g
发帖数: 1055 | 4 Sometimes business has no choice but to go with open source -- for its
flexibility and openness to integrate other (infrastructure) applications,
for a fraction of the cost of commercial products that don't meet your
requirements. Say, you want a central Radius server, there are many fine
commercial radius server out there, but they all lack some important
features needed by operations: can not integrate the configuration to
central revision control system, it is a PITA to rebuild a new server f... 阅读全帖 |
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s*****g
发帖数: 1055 | 5 Sometimes business has no choice but to go with open source -- for its
flexibility and openness to integrate other (infrastructure) applications,
for a fraction of the cost of commercial products that don't meet your
requirements. Say, you want a central Radius server, there are many fine
commercial radius server out there, but they all lack some important
features needed by operations: can not integrate the configuration to
central revision control system, it is a PITA to rebuild a new server f... 阅读全帖 |
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p****s
发帖数: 32405 | 6 最近在XP上钻研这个玩意, 写个工作笔记吧, 如果有人也玩过这个看看能不能提示下.
大的picture就是三个东西:
1. 一个无线网卡做wireless node (WN)
2. 一个AP作为authenticator
3. AP跟Radius server(Authentication server, a.k.a AS)都连在一个LAN上
现在的情况是:
WN可以跟AP associate上,
AP 和 Radius server也可以互ping
但是, WN上总显示authenticating... 然后就time out fail了.
具体log如下
2008-09-05 9:49:33.277 - Interface 'WLAN miniUSB Adapter - Packet Scheduler Miniport' is scanning for wireless networks. Please wait.
2008-09-05 9:49:33.293 - Interface 'WLAN miniUSB Adapter - Packet Scheduler Mini |
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c**********g
发帖数: 222 | 7 这篇文章做了至少十条假设，很多不靠谱，做天文的没几个人信，做暗物质探测的倒是
挺当回事。不过到底惊动了Scott Tremaine发文驳斥。他们的结论完全相反，太阳系周
围不仅有暗物质，而且跟LCDM预言一致。
http://arxiv.org/abs/1205.4033
Jo Bovy, Scott Tremaine
On the local dark matter density
An analysis of the kinematics of 412 stars at 1-4 kpc from the Galactic mid-
plane by Moni Bidin et al. (2012) has claimed to derive a local density of
dark matter that is an order of magnitude below standard expectations. We
show that this result is incorrect and that it arises from the invalid
assumptio... 阅读全帖 |
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h*****y
发帖数: 366 | 9 我想问下回旋半径,radius of gyration是指的是什么.
我在wiki上面查了下,In polymer physics, the radius of gyration is used to
describe the dimensions of a polymer chain.
然后有一个公式,其中有个Rk,还有个Rmean.我想象不出它们具体指得是什么.
我看的一本书上说,polymers are most extensively solvated in solvents of the
same delta value,resulting in stiffer chains with greater radii of gyration.
究竟是怎么一回事呢?
溶剂化以后为什么会变硬,直?回旋半径为何会变大?
我不是学高分子得,但是修得一门课涉及到了这个概念.很让我苦恼.
谢谢解答.小女子将不胜感激. |
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c********r
发帖数: 2227 | 10 请问动态光散射可以用来估量高分子刚性么？
DLS测量的是hydrodynamic radius.
请问这个radius和persistence length 或者 kuhn length 有关系么？
欢迎大家讨论。
另外，其实我还是很喜欢上这个版的，不过无奈人气ms不太足啊。
小小的建议，不如哪位xdjm带个头做个文献推荐之类的也好啊～
小弟刚刚如行，希望多多拓宽视野。
多谢～ |
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D**u
发帖数: 204 | 11 This method essentially generates a solution from an odd-numbered polygon,
rather than from an even-numbered polygon. Following this line, we can
generate a closed curve from any convex odd-numbered polygon A_1, A_2, ..., A_
(2n+1).
The idea is: centered at point A_k with radius x_k we draw a curve which has
the two end points on the line A_kA_(k+n) and A_kA_(k+n+1); then with radius y
_k we draw another curve which has two end points on the opposite
direction of A_kA_(k+n) and A_kA_(k+n+1).
To |
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A****s
发帖数: 129 | 12 you first draw a big enough circle, and then cut an open "hole" of radius 1
in its interior, and radius 1/2, 1/4,1/8.... all of these circles are
infinitely many connected components.
is |
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e****i
发帖数: 2152 | 13 最紧密堆积的情况下.
cylinder radius R, length L
sphere radius r
有什么公式算空隙比率?
多谢 |
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l***i
发帖数: 38 | 14 I am modeling a axisymmetric thin shell strcture. I want to plot the radial
stress vs. radius. I don't know how to generate it in ABAQUS, the report only
shows the stress at each integration point, but I don't know the corresponding
radius? Can somebody help me with it? Thanks!!!!!!! |
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c*********n
发帖数: 96 | 15 Your case is a singlular limitation of several different models.
i) one big disc capacitor. As the radius -> infinity, the magnetic field is
a linear function of radius.
ii) An array of square disc capacitors forming a 2D lattice. As the disc
size grows to overlap with each other, the field becomes uniform. There is
no center. Therefore, magnetic field everywhere is zero.
To sum up, your question is meaningless. It is just like asking if infinity
is an even or odd, rational or irrational, real o |
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m********r
发帖数: 811 | 16 equivalence
To first order and in the x-a plane, for non-relativistic particles, a
homogeneous magnetic sector, with central angle A and radius of curvature R,
is equivalent to a cylindrical electrostatic sector of central angle A/n
and radius of curvature n*R. Determine n. |
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b***k
发帖数: 2673 | 17 ☆─────────────────────────────────────☆
woshigsw (砍砍砍) 于 (Wed Feb 27 16:28:50 2008) 提到:
Three circles of radius of 1,2,3 are in contact with each other. In the gap
between the three circles put one more circle which is also in touch with
all other three circles. What is the radius of the new circle?
I have one way to do it but I am not satisfied with it.
Connect all centers of those circles. The original three circles' centers
form a triangle and this triangle is divided into three small tr |
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y********u
发帖数: 44 | 18 Q2.
Three circles of radius of 1,2,3 are in contact with each other. In the gap
between the three circles put one more circle which is also in touch with
all other three circles. What is the radius of the new circle?
早忘光了，怎么也想不起来有啥simple的方法
谢谢 |
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J**********g
发帖数: 213 | 19 Let's take r=1 in your original post to consist with the link provided by DuGu. Using that graph, if it's what you meant, suppose those two points that you
choose are all on x-axis as shown in the graph, ie, those points should be 0
,2,4,etc, then do you have a sphere with radius .5 as one of your sphere? If
yes, this sphere would cut the first black cicle (the one closest to origin
from right in the graph) in the first and fouth quadrants. Similarly, if
you contain sphere with radius 0 |
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o*****m
发帖数: 3 | 20 谢谢，刚才google了一下，发现你说的都是对的
Sun-Earth distance: 149,598,000 km
Moon-Earth distance:384,000 km
radius of Sun: 440,000 miles
radius of Moon:1,080 miles
Eccentricity of Orbit Earth: 0.017
Eccentricity of Orbit Moon: 0.05 |
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c***x
发帖数: 628 | 21 What "Lockup" Really Means
by Jonathan Thayer on January 09, 2013
I receive a good number of questions regarding what "lockup" really means
and the differences in the different percentages.
I typically don't quote other sources often, but Mr. Jim El Nabli (a BMW
enthusiast) stated it better than I can. (I only edited some of the spelling
mistakes and formatted it a bit different than his original email.)
In a standard differential, if one wheel loses traction, it will get all the
power and will ... 阅读全帖 |
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h******t
发帖数: 872 | 23 US Navy drones: Coming to a carrier near China?
ShareretweetEmailPrint AP – FILE - In this Feb. 4, 2011 file photo
released by the U.S. Navy and Northrup Grumman, the navy X-47B …
Related Quotes Symbol Price Change
BA 78.12 -0.91
NOC 64.55 -0.31
^GSPC 1,338.64 +0.87
By ERIC TALMADGE, Associated Press Eric Talmadge, Associated Press – Mon
May 16, 7:31 am ET
YOKOSUKA, Japan – The U.S. is developing aircraft carrier-based drones that
could provide a crucial edge as it tries to counter China's mi... 阅读全帖 |
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c***s
发帖数: 70028 | 24 核心提示：生存主义者总是在绞尽脑汁寻找安身之所，罗伯特·维奇诺设计的地堡社区貌似是个不错的选择：可以承受十英里外5000万吨级的核爆炸、时速450英里的大风、里氏10级大地震、长达10天677摄氏度的地表大火，还有三周的洪水。
Terra Vivos地堡的设计结构
我一路向东，开车深入到美国加州东南部距离巴斯托（Barstow）大约80公里的莫哈韦沙漠（Mojave Desert），然后拐上一条没有路标的碎石路。车停到一块周围满是铁丝网的空地之后，我走进一座貌似煤渣砖的车库，又爬了两段陡峭的钢筋混凝土楼梯，来到了此行的目的地——传说中的世上第一个能抵御一切袭击的地下豪华社区。
豪华得就像在游轮上一样
我见到了罗伯特·维奇诺（Robert Vicino），这个项目的负责人。他伸出手来欢迎我，并关上了我们身后1.36吨重的防爆门，然后问我：“你成家了吗？”
“你有寿险吗？你想安全十倍吗？”他连珠炮地向我发问，接着用熟练的腔调介绍，“我可以让你的梦想成为现实。我们所在的这座建筑，是 AT&T在1965年建造的，当时是为了保护电话设施免遭核攻击，现在可以用来保护更重要的人——你和你的家人。每人... 阅读全帖 |
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o***s
发帖数: 42149 | 25 比起戛纳、柏林和圣丹斯， 多伦多国际电影节（TIFF）在规模、明星阵容和片单质量上都要遥遥领先。
《美国丽人》、《为奴十二年》和《贫民窟的百万富翁》等历届奥斯卡最佳影片，都曾在此电影节上进行全球首映。因此，TIFF被誉为每年颁奖季之前最重要的电影节。
今年，多伦多国际电影节走到了第41个年头。光从片单数量来看，就足以令各路媒体和各国产业人士期待值爆棚：
为 期11天的电影节将放映397部电影，包括296部长片和101部短片。其中最长的电影是来自菲律宾导演Lav Diaz的《离开的女人》，长达227分钟；最短的电影有两部，Anima, Silueta de Cohetes和Silueta Sangrienta，分别都只有2分钟。
在超过300部的放映电影中，138部将在多伦多电影节上进行全球首映。
这些电影来自83个国家。加拿大本土片单上有38部，包括加拿大和其他国家的合拍片。
记者一个人在5天内进行了24个图文采访和8个视频专访后，整个人的感觉只能用一个字来形容：残。
TIFF的前半段是最受关注的6天，也是大多数媒体为了采访挤破头的时间。从9月8日开始，每天都有5场以上的电影红毯仪式，... 阅读全帖 |
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w*********g
发帖数: 30882 | 28 澳大利亚航空专业人士对丝带图片的评论，感觉是目前为止最实在最客观的zt
来源: awzh 于 2010-12-29 11:35:08 [档案] [博客] 旧帖] [转至博客] [给我悄悄话
] 本文已被阅读：0次 字体：调大/调小/重置 | 加入书签 | 打印 | 所有跟帖 | 加跟
贴 | 查看当前最热讨论主题 Australia Air Power on J-20
Dr Carlo Kopp
Over the last few days imagery of what is claimed to be China's new stealth
fighter has appeared on a range of Chinese Internet sites. There have been
no official disclosures as yet, so many of the claims appearing in the media
may only be speculation presented as fact.
在过去几天里被称为是中国的新型隐身战机的图片在大批中国军事... 阅读全帖 |
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c**i
发帖数: 6973 | 29 (A) Yesterday I did not have time to read the report carefully. I left the
library before I read your reply. Indeed on my way home, I had the same
thought as you. Please note that I am no better than you in terms of
military knowledge.
(1) "Nearly all aircraft are propelled by airbreathing jet engines, and most
of the airbreathing jet engines that are in use are turbofan jet engines
which give good efficiency at speeds just below the speed of sound."
jet engine
http://en.wikipedia.org/wiki/Jet_e... 阅读全帖 |
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W***n
发帖数: 11530 | 30 I would worry only if I am in Japan, say within a 300 mi radius |
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b******n
发帖数: 4225 | 31 日本没法控制事态只好请美国佬出面了
美国佬动手前先搜集信息
http://search.japantimes.co.jp/cgi-bin/nn20110317x1.html
The U.S. military will operate a Global Hawk unmanned high-altitude
reconnaissance aircraft over a stricken nuclear power plant in Fukushima
Prefecture, possibly on Thursday, to take a closer look at its troubled
reactors, a Japanese government source said Wednesday.
Photographs taken by the plane equipped with infrared sensors could provide
a useful clue to what is occurring inside the reactor buildings, arou... 阅读全帖 |
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b**********n
发帖数: 2812 | 32 Highest Contamination in a 19-Mile Radius
By DAVID E. SANGER and WILLIAM J. BROAD 41 minutes ago
Another day of efforts to cool nuclear fuel in the stricken reactors and the
plant’s spent-fuel pools resulted in little or no progress, according to
American officials.
http://www.nytimes.com/2011/03/18/world/asia/18intel.html?_r=1& |
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g**1
发帖数: 10330 | 33 URGENT: Radiation 1,600 times normal level 20 km from Fukushima plant:
IAEA
VIENNA, March 22, Kyodo
Radiation 1,600 times higher than normal levels has been detected in an
area about 20 kilometers from the crippled Fukushima Daiichi nuclear power
plant, International Atomic Energy Agency officials said Monday.
Data collected by an IAEA team show that radiation levels of 161
microsievert per hour have been detected in the town of Namie, Fukushima
Prefecture, the officials said.
The government has... 阅读全帖 |
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w*********s
发帖数: 2136 | 34 【 以下文字转载自 WorldNews 讨论区 】
发信人: whiteclouds (/ 参考消息 /), 信区: WorldNews
标 题: Ann Coulter称核辐射为防癌之疫苗 。。。
发信站: BBS 未名空间站 (Wed Mar 23 03:33:03 2011, 美东)
'Radiation is good for you,' says Ann Coulter as she weighs in on Japan's
nuclear crisis
By David Gardner
Last updated at 9:35 PM on 18th March 2011
Conservative maverick Ann Coulter has poured scorn on growing fears over the
fallout from Japan’s nuclear crisis by claiming that ‘radiation is good
for you.’
With her bizarre outburst, Coulter became the... 阅读全帖 |
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c**i
发帖数: 6973 | 35 BBC Chinese, May 16, 2011.
http://www.bbc.co.uk/zhongwen/simp
/world/2011/05/110516_us_china_drone.shtml
, which is based on
Eric Talmadge, US Navy drones: Coming to a carrier near China? Associated
Press, May 16, 2011
http://news.yahoo.com/s/ap/20110516
/ap_on_re_as/as_china_us_military_rivalry_drones_3
("Current Navy fighter jets can only operate about 500 nautical miles (900
kilometers) from a target, leaving a carrier within range of the Chinese
missile. Drones would have an unrefueled comb... 阅读全帖 |
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c**i
发帖数: 6973 | 36 (1) Anisimov Sergey and Igor Siletsky, Russia's response to US missile
defense plans. Voice of Russia, Oct 15, 2011
http://english.ruvr.ru/2011/10/15/58784848.html
("US Ambassador to Moscow Michael McFaul said during his address to Congress
this week that Washington will not sign any agreements to the effect that
the American missile defense project is not directed against Russia. Russia
got the message")
Note: In fact, Mr McFaul, who has been Pres Obama's top Russia adviser, is a
nominee for th... 阅读全帖 |
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V****n
发帖数: 651 | 37 楼主确实犯了一些严重错误。
先简要介绍一下燃烧知识，碳氢化和物不完全燃烧产物包含千百种不同成分。不论是烧
甲烷为主的天然气，还是以C8H18为主的汽油，还是C12H26为主的柴油，产生的成分都
是一样的，不同的只是各个成分的浓度。如果是富油燃烧，很容易形成碳颗粒（soot)
。碳颗粒刚形成的precursor particle大小只有2-3纳米，分子量大致为2000-5000之间
，然后迅速通过表面反应形成20-40纳米大小的颗粒（期间dehydrogenation过程导致碳
原子和氢原子比例达到9：1左右,基本上成为吸收光线最有效的blackbody黑体)，分子
量达到100万左右。在这个过程中碳颗粒之间通过碰撞agglomeration过程形成类似
fractal的aggregate，这种aggregate大小由具体燃油化学反应时间，包括氧化时间长
短决定，包含从几十个到几万个颗粒，由于是三维结构fractacal dimension 只有1.8
左右, 所以直径（radius of giration)从接近1微米到大于10微米都有。好的柴油机氧
化过程完全，产生的aggregat... 阅读全帖 |
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c***c
发帖数: 21374 | 38 ☆─────────────────────────────────────☆
WanderingLA (飞扬) 于 (Tue Nov 22 14:50:45 2011, 美东) 提到:
我在洛杉矶，这边的能见度总体来讲比国内要好，但是呼吸道过敏的人很多很多。美国
人把这个认为是花粉过敏，但是事实上如果查一下该类疾病的发病记录就可以发现，70
年代之前鲜有人得这个病。
事实上70年代是洛杉矶空气污染最为严重的时期，著名的洛杉矶烟雾，是大气化学研究
中的重要课题，到现在也是。
相比国内各大工业城市以含硫煤燃烧引发的大气污染（这也有个名字：伦敦型烟雾），
洛城的空气污染主要是含氮氧化物所至。因为这种微粒不比硫化物那样对大气中的水那
么有亲和力，所以微粒不会在大气中生长得很大，因此基本上不会影响到城市的能见度
（要知道，干净的空气中也必须要有一定含量的各种微粒的，这些微粒对降水的形成非
常重要）。 但是氮氧化物在强烈的太阳照射下，会形成强氧化性的臭氧或者原子氧，
这才是呼吸道疾病的真凶！
洛城最近二十年来，不断地有炎热夏季路人在downtown 突然暴毙的记录，不要以为是
中暑哦！... 阅读全帖 |
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h*****9
发帖数: 6643 | 39 没听说过是你自己无知。这只能说明你是个很容易被骗的无知之徒， 你又要凭你自己的无知骂人，你又无耻了。
揭露 BIG-BANG 是披着科学外衣的宗教，这在10年前就有很多文章了。
THE "BIG BANG" IS JUST RELIGION DISGUISED AS SCIENCE
by Michael Rivero
Once upon a time, a long time ago, there was this guy named Aristotle.
Pretty sharp fellow; he thought up a lot of good things. But, occasionally
he made a mistake.
One mistake he made was to toss an orange up in the air and watch it come
straight back down to his hand. Aristotle reasoned that if he was moving,
the orange would have flown... 阅读全帖 |
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m********5
发帖数: 17667 | 40 MD才杀了3个就叫种族仇杀，拿华人死了五六个就叫一般帮派打斗？！
(Reuters) - Police acting on a tip arrested two white men on Sunday for a
shooting spree in Tulsa that left three dead, two wounded and rattled the
predominantly black neighborhood.
Tulsa police spokesman Jason Willingham said police were not prepared to
label the shootings racially motivated hate crimes after the arrest of Jake
England, 19, and Alvin Watts, 32, on murder charges just before 2 a.m. (0600
GMT) Sunday.
"At this point we don't have a motive," Willin... 阅读全帖 |
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d******a
发帖数: 32122 | 41 ☆─────────────────────────────────────☆
SetTimer (RumorKiller) 于 (Wed Jun 20 08:59:26 2012, 美东) 提到:
一句话解释漂浮：地球引力全部用于产生速度改变(就mg=F=ma；这个速度改变，主要
指方向沿椭圆的改变）
一句话解释什么是文科生心中的“重力”：地球引力使人体对地面产生压力，其
反作用力使文科生感觉到重力；在空间站，这个重力（i.e., 地球引力）还是存在，只
是不用于小将老将废柴压地面，而是用于速度方向改变（将轨道简化为正圆）
一句话解释失重和超重：Nmg超重。N在这里是压力或拉力
一句话解释，为什么空间站不掉下来：因为mg刚好等于ma，所以没有多余的力干别的了，
这也是为什么地球不掉到太阳上，月亮不掉到地球上
一个词解释，为什么不提供能量的话最终还是要掉下来：大气。这个所需能量不比
你家空调大
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cellneuron (cell2) 于 (Wed Jun 20 09:59:3... 阅读全帖 |
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S***a
发帖数: 3956 | 42 JF-17:
Combat radius: 1,352 km (840 mi)
Ferry range: 3,482 km (1,880 NM)
to |
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d**********i
发帖数: 4877 | 43 http://www.foreignpolicy.com/articles/2013/06/11/is_this_chinas
You're looking at what some people are speculating is China's design for a
stealth bomber. It may look like a simple model right now. But these Chinese
models have a habit of turning into working airplanes. And if that happens
in this case, watch out. Because it could potential give these Chinese the
ability to penetrate deep, deep into enemy territory without the opponents
ever knowing what hit them.
Remember, designs very similar ... 阅读全帖 |
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x****u
发帖数: 12955 | 44
Navy has fixed wing aircrafts operating from land. Su-33 belongs to PLA
Navy. They can all fly well above WWII era fighter's flight ceiling, and
each aircraft carry enough laser guided bombs to sink at least one carrier
on each flight. Plus, their combat radius is several times the range of
WWII era carrier aircrafts. |
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S**C
发帖数: 2964 | 45 So they basically use it like a Volt, instead of having an ICE as range
extender also keep the benefit of readily available energy source (gasoline)
, they ask for 4x more battery capacity as range extender and grounded
within xxx miles radius. I won't call it a sound value proposition for the
majority of the public. |
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b********n
发帖数: 38600 | 46 16 People On Things They Couldn’t Believe About America Until They Moved
Here
http://thoughtcatalog.com/michael-koh/2013/11/16-people-on-thin
1. Rakib Islam
I am originally from Bangladesh and here are a few things that I find hard
to explain to peeps back home.
•Fruits and vegetables are way more expensive than meat and poultry.
•That, generally speaking, the poor is more obese than the rich.
•A lot of couples adopt children, sometimes in spite of having their
own, and treat t... 阅读全帖 |
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r*m
发帖数: 16380 | 47 why not simply measure it?
draw a big perfect circle, then measure the radius and the circle length |
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S***a
发帖数: 3956 | 48 F18：Combat radius: 400 nmi (460 mi, 740 km) on air-air mission |
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