b*********f
发帖数: 1585 | 1 现在不少做几何的人都是在做物理。
不过几何上也有其他领域，比如几何流（ricci flow, mean curvature flow），复几
何等等。 |
|
m********5
发帖数: 17667 | 2 http://www.youtube.com/watch?v=aHnQWPjS7aE
At the recent Google “Solve for X” conference on February 7, Lockheed
Martin's long-term R&D department (“Skunk Works”) announced they are
working on a compact fusion reactor. With what seems a 4th generation
prototype called "T4", the aerospace giant says to have developed a high
beta configuration, which allows a compact reactor design and faster
development timeline.
Lockheed Martin and its infamous "Skunk Works" top-secret technology
development gro... 阅读全帖 |
|
x*****8
发帖数: 10683 | 3 这个转弯的curvature（我不知道这个中文是什么）太大了。设计问题! |
|
n*******4
发帖数: 2285 | 4 Groud based Radar can detect aircraft flying about 15000m high from 400 km
away over Earth curvature.B52 is a large object to see too. 400km should be
fine. |
|
k******k
发帖数: 888 | 5 丘成桐在他所写的《微分几何讲义》的序言中写道，随着微分方程理论的逐渐成熟，几
何学家开始应用分析方法来解决几何问题，这就是老丘的主要贡献，他开创了几何分析
学派，并且解决了卡拉比猜想和正质量猜想。
在他之前，微分几何由局部微分几何向整体微分几何转变，比如在他的序言中他提到了
Hopf，这个人是第一个将整体几何上的曲率与拓扑学性质相联系的人，从Killing–
Hopf theorem之后，很多人都开始用各种手法来研究曲率与拓扑上的关系，微分方程与
微分几何的结合也就孕育而生，现在用几何流（比如ricci flow, mean curvature
flow等等）的手法很流行，而几何流其实就是一个关于几何度量的偏微分方程。 |
|
x****u
发帖数: 12955 | 6
Radar against surface target has range of 30-50 nm at most, no matter what
kind of radar you have. This is the physical limit imposed by earth's
curvature.
To utilize the missile's range, you'll need target information from a
friendly unit that is either close enough or high enough to see over the
horizon. |
|
l***y
发帖数: 1166 | 7 4) but the two twin universes have different singularities (in other words:
in our twin cosmos there is not the same number of galaxies, and those
which are there do not have the same structure.) There is not thus another
twin UMMO nor another twin EARTH as one could believe. This last conclusion
is not hypothetical and we will give you its justification.
5) the two cosmos " were created " simultaneously but their arrows of time
are not directed in the same direction. That is, it is illogical ... 阅读全帖 |
|
l***y
发帖数: 1166 | 8 4) but the two twin universes have different singularities (in other words:
in our twin cosmos there is not the same number of galaxies, and those
which are there do not have the same structure.) There is not thus another
twin UMMO nor another twin EARTH as one could believe. This last conclusion
is not hypothetical and we will give you its justification.
5) the two cosmos " were created " simultaneously but their arrows of time
are not directed in the same direction. That is, it is illogical ... 阅读全帖 |
|
l***y
发帖数: 1166 | 9 4) but the two twin universes have different singularities (in other words:
in our twin cosmos there is not the same number of galaxies, and those
which are there do not have the same structure.) There is not thus another
twin UMMO nor another twin EARTH as one could believe. This last conclusion
is not hypothetical and we will give you its justification.
5) the two cosmos " were created " simultaneously but their arrows of time
are not directed in the same direction. That is, it is illogical ... 阅读全帖 |
|
h*****d
发帖数: 244 | 10 国内人无知也就算了，号称万能的军版也这水平，太掉价了
http://www.smithsonianmag.com/history/charles-proteus-steinmetz
Charles Proteus Steinmetz, the Wizard of Schenectady
His contributions to mathematics and electrical engineering made him one of
the most beloved and instantly recognizable men of his time.
By Gilbert King
smithsonian.com
August 16, 2011
Steinmetz and his contemporaries (Tesla, Einstein and others) at the Marconi
wireless station in New Jersey. Image courtesy of Wikicommons
He stood just four feet tall, hi... 阅读全帖 |
|
c***l
发帖数: 2490 | 11
没觉得牛津大学的GTM丛书比Springer的GTM丛书B格高。PUP出的好的书都是那些鹅毛犹
太人写的。很多书都很薄，很薄。需要功底。
总之看作者不看出版社。看出版社太“那义务（江蛤语）”了。
一般鹅毛犹太人写的数学书都不错。鹅毛犹太人是美国数学学会一个很大的势力，经常
“打压中国人（星宿老仙语）”。
下面是牛津的GTM list
1. Keith Hannabuss: An Introduction to Quantum Theory
2. Reinhold Meise and Dietmar Vogt: Introduction to Functional Analysis
3. James G. Oxley: Matroid Theory
4. N. J. Hitchin, G. B. Segal, and R. S. Ward: Integrable Systems: Twistors,
Loop Groups, and Riemann Surfaces
5. Wulf Rossmann: Lie Groups: An Introduction through Linear... 阅读全帖 |
|
b***y
发帖数: 14281 | 12 米尤再不服，也只能玩点这种小动作，但是历史最终还是会偏向老杨的。现在Yang-
mills代替gauge的现象很普遍了，即使不说yang-mills，也直接说connection,
curvature。说gauge感觉很土，像是60年代学的理论物理，会给人自己数学不行的印象。 |
|
m**c
发帖数: 7349 | 13 “All the world’s a stage…,” Shakespeare wrote, and physicists tend to
think that way, too.
Space seems like a backdrop to the action of forces and fields that inhabit
it but space itself is not made of anything—or is it? Lately scientists
have begun to question this conventional thinking and speculate that space—
and its extension according to general relativity, spacetime—is actually
composed of tiny chunks of information.
These chunks might interact to create spacetime and give rise to its
pro... 阅读全帖 |
|
发帖数: 1 | 14 12月 谈谈间谍问题
我一直感觉Reuters 有日本的间谍，他们会通过报道来传递针对华人屠杀的计划，和发
布不利于华人的报道，制造舆论。最重要他们后边的势力和犯罪集团有关。有必要好好
调查这个组织。
How top U.S. colleges hooked up with controversial Chinese companies
By Steve Stecklow and Alexandra Harney
Filed Dec. 2, 2016, noon GMT
New Oriental, China’s biggest private educator, has been accused of
academic fraud. Thanks to two enterprising Americans, it has also gained
access to leading U.S. college admissions officers.
SHANGHAI/SHELTER ISLAND, New York - Thomas Benson once ran a small... 阅读全帖 |
|
w****a
发帖数: 139 | 15 看不下去了，我来打个脸吧
大气中如果没有凝结核，要水汽的相对湿度要达到500%才能凝结成水滴，原因是
Curvature/Kelvin Effect |
|
g**1
发帖数: 10330 | 16 黄荣毅爱逻辑分析 研究数学当艺术
记者俞姝含／纽约报导 2017年10月23日 06:26
669
人气
小 中 大
黄荣毅研究理论数学，入围西门子科学奖地区决赛。(黄荣毅提供)
黄荣毅研究理论数学，入围西门子科学奖地区决赛。(黄荣毅提供)
亨特学院附属高中(Hunter College HS)17岁学生黄荣毅(Brian Huang)喜欢研究理论数
学，日前入围2017年“西门子科学奖”(Siemens Competition in Math, Science &
Technology)地区决赛，热爱逻辑分析的他表示，他一向把学习当乐趣，研究数学也是
一门艺术。
黄荣毅的父母均是华南师范大学的校友，父亲在美国拿到数学博士学位，母亲也在美国
拿到电脑工程硕士学位。“小时候父亲在客厅放了一块白板，带我一起解比学校里教得
更难的数学题，让我了解到角度完全不同的数学。”自那时起他也爱上了数学，曾多次
入围美国数学邀请赛(AIME)、美国初级奥数竞赛(USAJMO)和美国奥数竞赛(USAMO)，也
曾在11年级拿到美国物理奥林匹克竞赛(US Physics Olympiad)铜奖。今年暑假，... 阅读全帖 |
|
发帖数: 1 | 17 就是 那个公式。
the Euler characteristic of a closed even-dimensional Riemannian manifold is
equal to the integral of a certain polynomial of its curvature. It is a
direct generalization of the Gauss–Bonnet theorem |
|
发帖数: 1 | 18 美联储接盘美国国债酿恶果, 为何说回购让美联储陷入两难境地?
最新的数据显示，美国回购市场最近又出现了资金紧缺的迹象。周二，纽约联储向金融
市场提供了将近1000亿美元的短期流动资金，包括隔夜回购操作合计639亿美元，以及
14天的定期回购操作合计350亿美元。其中，1月21日到期的14天回购操作共得到投标
411.2亿美元，是2019年12月中旬以来定期回购的投标额首次超过联储最高目标水平350
亿美元。隔夜回购需求的激增，表明回购市场资金紧缺的局势再次恶化，这个美联储可
能已经陷入两难的境地。
首先，今年9月份美国突发“美元荒”令美联储措手不及。为了帮助美国转移危机，美
联储开始了多项“印钞”计划，从10月份起美联储每个月将印钞600亿美元来购买美债
，预计将持续到明年6月，将印钞5400亿美元。
不过，此举并未能在短期内遏制住其金融市场上面临的危机，因此美联储又不断推出新
的印钞计划。据统计，从今年12月13日至明年1月14日这一个月间，美联储将会再“放
水”约5000亿美元，以防止“美元荒”危机再现。
美联储最近释放的资金，大部分通过购买美债或美元资产的形式流入美国金融市场，这... 阅读全帖 |
|
p****s
发帖数: 3184 | 19 No. The formula (5) is a point-to-point one. Earth curvature is irrelevant
here.
目标截面面积δ = 5000m^2 which is of a Nimitz-class carrier (length 333m *
height 15m).
雷达发射功率Pt (cm) = Pt (mm) = 50kW, which is about the max value you can
put into a missile's warhead
天线增益Gt (cm) = Gr(cm) = Gt (mm) = Gr(mm) = 26dBi
Here is a 27dBi 5.8GHz (wavelength ~=5cm 厘米波) directional antenna on
taobao
http://item.taobao.com/item.htm?spm=a230r.1.14.40.Pfeg8g&id=390
1&abbucket=8#detail
It's about the max size you can... 阅读全帖 |
|
p****s
发帖数: 3184 | 20 That formula (5) in the paper is based on Nimitz-class carrier with cross-
section area size 5000 square meters (333meter in length and 15meter in
height).
And the formula is a free-space point-to-point model. Your earth curvature
argument doesn't apply here.
And the other parameters used in the formula are all reasonable for an anti-
ship missile's warhead, e.g., 26dBi antenna and 50kw transmission power.
This leads to a reasonably practical radar maximal range of 20km, which is
the upper li... 阅读全帖 |
|
d*b
发帖数: 4184 | 21 [Rushton, J. P. (1995). Race, evolution, and behavior: a life history
perspective. New Brunswick, NJ: Transaction]
African-descended people (Blacks) average cranial capacities of 1267 cm3
, European-descended people (Whites) 1347 cm3
, and East Asian-descended people (East Asians) 1364 cm3
ethe race differences on IQ tests,
Blacks average an IQ of 85,
Whites 100, and
East Asians 106.
the race differences in brain size are correlated with 37 musculoskeletal
variables shown in standard evolutionar... 阅读全帖 |
|
C*****8
发帖数: 5758 | 22 https://www.ferris.edu/HTMLS/news/jimcrow/letters/2012/apes.htm
Are Negros Closer to Apes Than to Humans?
Are these facts in the museum:
The negro skull, in addition to having a smaller brain volume and thicker
cranial bones than that of the White, is prognathous ; i.e., the lower face
projects forward in the manner of an animal's muzzle. The negro jaw is
substantially longer, relative to its width, than the White jaw. A feature
of the negro lower jaw is its retention of a vestige of the "simian... 阅读全帖 |
|
t*****0
发帖数: 264 | 23 发信人: wokaowokao (GaN), 信区: Automobile
标 题: 我的上庭经历+所用文件
发信站: BBS 未名空间站 (Tue Feb 10 16:00:47 2009)
去年8月25号晚上,从家里去学校的路上被抓,40的路,条子说我开了54.二话不说,一张
ticket,我一看,还是我们学校的警察,nnd,下手真狠.条子是迎面开来的
然后就去法院要求上庭,初定是11月底吧,一共要去两次,前一次递交motion,第二次
trial
谁知道我把日子记错了,递交motion那次忘记去了.第二天再去,说只能重新安排时间.于
是motion递交排到1月27号,今天trial.我对本州的speedy trial不是狠了解.由于上一
次也是我的失误,没能按原有排期,所以我也不指望靠speedy trial的trick了.
1月27号,坐在大厅里面溜溜的等了几个小时,无聊透顶,自己翻看着打官司的书.老爸非
要陪着去看看,也是无聊的坐了半天.倒是前台坐着的一个貌似intern的小姑娘clerk,她
忙完自己的活,拖着腮帮百无聊赖的在prosecutor的位子上发呆,让我觉得大厅... 阅读全帖 |
|
f******d
发帖数: 6361 | 24 我的车子是toyota camry，我最近发现（以前没有很留意）前胎看上去明显比后胎flat。
厂商recommend的最大胎压是35pound。无论是自己打气还是mechanic给我打气，我都是
要求32-33pound。作天我换engineer oil，还做了tyre rotation，mechanic说给我打
了32pound。我今早发现前胎仍然明显比后胎flat。我google了一下，这好像是正常
的，但还是想请教一下大家。
网上看到的解释：
1.
That's a characteristic of radial tires cars today have radial tuned suspension and there is a curvature in the sidewall that helps the car respond to curvy roads , swerving around an obstacle to avoid crash.etc. and the slight bend in the steel belts give the illusion... 阅读全帖 |
|
b****n
发帖数: 3343 | 25 32-33psi is too low, especially when you ask mechanics for such pressure
setting. What is in owner's manual? If it states 32psi, which is under
assumption that car is cold. It the car is driven for more than 1 mile, it
is considered to be "warm/hot". In this case you need to raise the tire
pressure at least additional 4+ psi.
For better gas mileage, it's also suggested to raise the tire pressure a
little bit. In addition, the #1 reason of blow-out is low tire pressure. I
usually set the tire pr... 阅读全帖 |
|
d******e
发帖数: 7844 | 26 换个更techinical的说法，做泰勒展开的时候，likelihood function的curvature太差
，不够regular，所以二阶不足以拿来近似。 |
|
d******e
发帖数: 7844 | 27 换个更techinical的说法，做泰勒展开的时候，likelihood function的curvature太差
，不够regular，所以二阶不足以拿来近似。 |
|
p*********e
发帖数: 48 | 28 【 以下文字转载自 Immigration 讨论区 】
发信人: prettysnake (Beautiful Curvature), 信区: Immigration
标 题: J1访问学者，可以以配偶身份跟我一起申请绿卡吗
发信站: BBS 未名空间站 (Fri Nov 12 15:46:46 2010, 美东)
我老婆现从国内来美国做访问学者，J1签字，要求回国服务两年以后才能再来美国。我想趁她还在美国，我申请绿卡，她以配偶的身份，跟我一起申请。这种情况，美国移民局会批吗？还是需要先办J1 waiver？ |
|
C***U
发帖数: 2406 | 29 写一点我的这一年半的感受和经验吧！里面可能很多东西是错误的或者只是我自己有用
，对旁人不一定有用，但是写出来和转行的同学们一起分享分享，造福一点后人吧。
忘记了这句话是谁写的，但是这句话是我感受最深的一句话：
我们应该做行动上的巨人
转行篇：
先介绍一下我的背景吧，本科是国内重点高校数学专业基础方向，当然这个方向的意思
是选修几门基础数学方向的课。博士是美国100左右（应该是开外的）的烂校数学专业
拓扑方向。之前 的cs背景是本科学了一学期的c语言（本科混混的，所以基本等于没学
）。2010年的时候，自学了一点iphone programming，但是也不深入，就是一点皮毛吧。
大概是2011年的4月份，我的phd第四年即将结束。我走进老板办公室，和他讨论毕业的
事情。那时候我的博士论文已经做得差不多了。已经发表和即将发表的论文一共三篇。
作为一个烂校基础数学的学生，这个差不多可以毕业了（不能和cs的牛人动不动就10几
篇的比，我们基础数学专业要求不高，不用很多论文）。在2010年4月的时候，我们讨
论同一个话题的时候，我老板数着手指头说，明年第五年，应该可以毕业了。但是，计
划赶不上... 阅读全帖 |
|
s****i
发帖数: 2993 | 30 the contact exam include curvature and size measurements,
plus fitting. |
|
l**x
发帖数: 296 | 31 Based on AJCC gastric cancer staging:
pT2 N0 Mx
侵及肌层，无淋巴结转移, 远端转移未知
It would be nice to have PET/CT scan to evaluate distant metastasis
if there is no distant metastasis, the final stage would be Stage IB
still considered fairly early.
There are a few ongoing clinical trials. The optimal
regimen for postoperative chemoradiotherapy has not yet been established.
The common chemotherapy drugs includes:
5-FU, VBL, CTX, MeCCNU, Ara-C
FYI:
Primary tumor (T)
TX: Primary tumor cannot be assessed
T0: No... 阅读全帖 |
|
E*****m
发帖数: 153 | 32 经常腰疼，照了X-ray,但报告看不太懂。 烦请高人指点一下， 谢谢～
Routine views of the lumbosacral spine were obtained. There is minimal
curvature of the lumbar spine to the left side. The study shows an irregular
osseous density at the anterior superior region of L4 vertebral body. There
appears to be disruption of the superior vertebral endplate and also
irregularity of the anterior cortex of the vertebral body. The findings are
most consistent with old corner bertebral body fracture. There is focal
degenerative spurring a... 阅读全帖 |
|
z***u
发帖数: 28 | 33 想请坛内各位帮我看看眩晕的问题，谢谢。
去年十月起因为眩晕开始看家庭医生，最初做了血检，排除缺铁性贫血，医生认为血液
循环不好，多喝水就行。今年初头晕频率增加，医生认为右耳内有大结块弄不出来导致
头晕，去了ent取出之后头右转不再晕。然而，头晕频率仍在增加，我感觉颈子和腰都
不舒服，做了X-ray，颈子正常，腰有mild levo-rotary curvature。今年5月头晕，还
出现手脚发麻，气喘不上来，我自己在腰那贴了膏药，脚不麻了，但双手指尖在摆动上
举还是麻，做了chest X-ray正常，做了血检cholesterol正常，brain mri正常，又被
赶回家，三个月再去医生那了。
问题是我现在天天晕，人就像在海上，坐那也晃，躺床上也觉得床在动，不能开车，工
作也辞了干不了。请问还有什么可能的问题，还能做些什么检查？有什么药或方法能缓
解头晕，我现在觉得脑袋重，脑袋里面压力大，很恶心想吐。再次感谢大家。 |
|
m*****a
发帖数: 2160 | 34 去看Neurology
别吃乱七八糟supplement，你不一定是脑血管供血不足，即使是supplemwent也不一定
比安慰剂靠谱，还反而可能不安全有副作用
[在 zwnju (岸芷汀蓝) 的大作中提到：]
:想请坛内各位帮我看看眩晕的问题，谢谢。
:去年十月起因为眩晕开始看家庭医生，最初做了血检，排除缺铁性贫血，医生认为血
液循环不好，多喝水就行。今年初头晕频率增加，医生认为右耳内有大结块弄不出来导
致头晕，去了ent取出之后头右转不再晕。然而，头晕频率仍在增加，我感觉颈子和腰都
:不舒服，做了X-ray，颈子正常，腰有mild levo-rotary curvature。今年5月头晕，
还出现手脚发麻，气喘不上来，我自己在腰那贴了膏药，脚不麻了，但双手指尖在摆动
上举还是麻，做了chest X-ray正常，做了血检cholesterol正常，brain mri正常，又被
:赶回家，三个月再去医生那了。
:问题是我现在天天晕，人就像在海上，坐那也晃，躺床上也觉得床在动，不能开车，
工作也辞了干不了。请问还有什么可能的问题，还能做些什么检查？有什么药或方法能
缓解头晕，我现在觉得... 阅读全帖 |
|
S*********t
发帖数: 522 | 35 其实很早就想写这往篇文章，但是总觉得必要不大，今天看到又有人上来说坐月子没有
科学依据，觉得还是有必要给大家说一下。先声明，我不是专家，我也是在网上学习的。
怀孕的时候，身体里激素发生变化。其中有一种激素，叫做relaxin。它的作用：
Relaxin relaxes the intrauterine ligaments, allowing the uterus and pelvis
to expand. Relaxin also relaxes other parts of your body, like your arteries
, which have to accommodate a much higher blood volume without sending your
blood pressure through the roof. Your musculoskeletal system also loosens up
, giving you more flexible joints and more curvature in the back to prepare
... 阅读全帖 |
|
t*******r
发帖数: 22634 | 36 不过 curvature tensor 这种高维的东东，今天世界上到底有多少
人理解，我表示悲观。
我表示悲观的原因，是看见前面 ananpig 有关用简单 linear equation
解鸡兔同笼的问题，前人已经解过无数遍了，而 ananpig 对于娃的
要求和 strategy 就是重复重复再重复。。。您说这样训练出来的娃，
到底是真正理解了 linear equation 呢？还是一只只工业化出品的
拷贝猫？俺表示悲观。。。
当然，工业化社会的确就是需要很多拷贝猫，不管理解还是不理解。。。
拷贝猫也没啥不好。。。但是前面讨论的东东是理解是不是？。。。 |
|
t*******r
发帖数: 22634 | 37 有道理。。。这个关键看怎么理解“理解”这个词。。。
但俺还是固执地认为，从前的那些非欧几何数学家，思维抽象性的牛鼻度，
跟爱因斯坦差十条街不止。。。我认为那些非欧几何数学家，思维层次还是
停留在“所想即所得”的境界，也就是自己想把空间弯成啥样子就是弯成啥样
子，也就比普通人的“所见即所得”就好了那么一点点。。。而爱因斯坦，
则是看到万有引力而想到 spacetime curvature tensor，并且让 NASA
在几十年之后，还耗资数亿美金去证明爱因斯坦的想法，这种抽象思维的高度
。。。俺认为完全够资格让牛顿亲笔发张贺电嘛。。。请转牛顿圈阅。。。 |
|
c******r
发帖数: 3778 | 38 OVERNIGHT CORNEAL RESHAPING (OCR) — Overnight corneal reshaping (OCR) is
the process of wearing a specially designed, rigid gas-permeable (RGP)
contact lens while asleep to temporarily effect a change in the corneal
curvature resulting in clear vision during waking hours without correction.
This technique is also referred to as:
●Corneal refractive therapy (CRT)
●Overnight corneal reshaping (OCR)
●Vision shaping treatment (VST)
●Orthokeratology (Ortho-K)
The process — After wearing OCR lenses, t... 阅读全帖 |
|
u*****a
发帖数: 6276 | 39 没治。天生的。
- - - -
Researchers found that Asian-American children were more likely to be myopic
, or nearsighted, than their Hispanic, African-American and white peers,
while white children were more likely to have hyperopia, or farsightedness,
than were children from the other ethnic groups. Astigmatism -- an irregular
curvature of the cornea that causes blurry vision -- was most prevalent
among Hispanic children.
Nearly one out of five Asian-American children in the study was nearsighted,
and one... 阅读全帖 |
|
u*****a
发帖数: 6276 | 40 没治。天生的。
- - - -
Researchers found that Asian-American children were more likely to be myopic
, or nearsighted, than their Hispanic, African-American and white peers,
while white children were more likely to have hyperopia, or farsightedness,
than were children from the other ethnic groups. Astigmatism -- an irregular
curvature of the cornea that causes blurry vision -- was most prevalent
among Hispanic children.
Nearly one out of five Asian-American children in the study was nearsighted,
and one... 阅读全帖 |
|
z*******1
发帖数: 1588 | 41 数学专业词汇：
bipolynomial
angle
curvature
triangle
vector
imaginary
epsilon |
|
|
p*********e
发帖数: 48 | 43 【 以下文字转载自 I140 讨论区 】
发信人: prettysnake (Beautiful Curvature), 信区: I140
标 题: EB1A十个条件中的High Salary的问题请教
发信站: BBS 未名空间站 (Wed Apr 6 16:01:55 2011, 美东)
我在美国大学做postdoc，我的工资当然没有同领域的公司engineer或大学教授高，但
比大多数postdoc高20%左右，这样是否可以满足EB1A的十个条件中的 "High salary/
compensation for services in comparison to others"? |
|
c**l
发帖数: 2661 | 44 DSP conference
需要1 选择自己懂的paper 审 不懂的不要乱要； 审稿仔细些
周日之前提交审稿结果
多谢
有需要的站内我
paper 1
on Decision Feedback Equalizers (DFE) are used to
eliminate the effect of Inter Symbol Interference (ISI) in band
limited channels. The Recursive Least Squares (RLS) is one of
the algorithms that are used to update the coefficients of the
equalizer due to its fast convergence. However, its complexity is
in the order of O(N2) multiplication per iteration. Fast fixed
order algorithms are used to solve the RLS algorithm u... 阅读全帖 |
|
c**l
发帖数: 2661 | 45 Keywords—writer identification; pattern classification; plane
curvature; curve fitting; dating ancient inscriptions; dating
Byzantine codices; contours similarity
dsp conference
站内联系 需要懂的 不是一个口的 不要发信息了
谢谢了 |
|
G**m
发帖数: 138 | 46 给你两个我的paper 被heavily cited的例子. 我的citation非常少（英文citation<50
)，所以这些正是我用来突出自己citation的地方。
“Another study used an ablation technique to make conclusions concerning
rates of diffusion and therefore disorder at grain boundaries. In this
technique layered samples with regions of isotopically heavy water are
ablated. The ablated material is analyzed using a mass spectrometer and the
diffusive profile around the isotopically heavy regions is correlated with
the annealing time. Such measurements provide a... 阅读全帖 |
|
wh
发帖数: 141625 | 47 贴几张wooster square的樱花照片，这两天天气好，大家抓紧去看：
路边各种花也很喜人：
night rainbow是new haven搞的一个laser活动，这周六晚上是最后一天。活动详情：
http://nightrainbownewhaven.com/
提供几个不同的观景地点：
1) 7th floor, the top, of the Shubert Garage (College and Crown Streets -
parking is $4 for restuarant week - if you eat out in New Haven. Or you can
park on the street and just take the elevator to the top!) - from here it
looks like the rainbow shoots straight UP!
2) Humphrey and Orange Streets, get out and look from the corner, and in
between house... 阅读全帖 |
|
s***e
发帖数: 5242 | 48 【 以下文字转载自 Mathematics 讨论区 】
发信人: Dotaking (loser), 信区: Mathematics
标 题: 一个牛人
发信站: BBS 未名空间站 (Sat Oct 20 14:37:59 2012, 美东)
这人很牛啊， 又是个8页的强文
arXiv:1108.1888 [pdf, ps, other]
3-manifolds with nonnegative Ricci curvature
Gang Liu
Comments: Revised version, accepted by Inventiones Mathematicae
Subjects: Differential Geometry (math.DG) |
|
t****i
发帖数: 4225 | 49 That's very tough to sell, because the eye ball curvature needs to be
exactly matched. |
|
t****u
发帖数: 10218 | 50 http://en.wikipedia.org/wiki/Astigmatism_%28eye%29
"Astigmatism is an optical defect in which vision is blurred due to the
inability of the optics of the eye to focus a point object into a sharp
focused image on the retina. This may be due to an irregular or toric
curvature of the cornea or lens." |
|
