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全部话题 - 话题: sphericity
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c********y
发帖数: 30813
1
来自主题: PhotoGear版 - [合集] 这焦外让我无语了
☆─────────────────────────────────────☆
redskeleton (红骨架/白菜猪肉丸子汤) 于 (Wed Dec 22 23:40:22 2010, 美东) 提到:
带老婆孩子出去看灯展,照了不少照片,回来一看,我靠,这圈圈也太多了点,整个无
数同心圆套在一起,这焦外..............
☆─────────────────────────────────────☆
arsilverfox (Alli) 于 (Wed Dec 22 23:41:35 2010, 美东) 提到:
快做个桃心镜头盖拍心型bokeh~x]
☆─────────────────────────────────────☆
yuanwang (gauntlet) 于 (Wed Dec 22 23:42:20 2010, 美东) 提到:
我觉得还不错啊
☆─────────────────────────────────────☆
beetle1986 (beetle) 于 (Wed Dec 22 23:42:46 2010, 美东... 阅读全帖
b******n
发帖数: 4509
2
来自主题: PhotoGear版 - EF 24-70 f/2.8L II Patent Published
It’s coming, really!
We posted the filed patent of a 24-70 f/2.8L II way back in October. However
it has now been published as of April 21, 2011. The big omission appears to
be IS. I think it’s safe to say the lens is coming soon.
Other Lenses in the Patent
A couple of other lenses appear in the patent. A 70-300 f/4-5.6L IS, which
has been released. Also appearing is a 55-250 IS lens. This could be a
version II of the current lens. It could also shrink to 200mm at the long
end.
Patent Informatio... 阅读全帖
b*******t
发帖数: 33714
3
来自主题: PhotoGear版 - 好奇弱问
跟类似的spherical lens比较过么?相差上差别明显么??
b*******t
发帖数: 33714
4
来自主题: PhotoGear版 - 都说85L好
apo一般只是红黄蓝三色spherical aberration的纠正吧,不过也有可见光以外波段的
t****g
发帖数: 35582
5
来自主题: PhotoGear版 - 上次问显微镜增加景深的tx,
CDM-Optics的那个东西?
其实就是人为引入一个spherical abberation。这个post processing还是要看SNR。
看来懒老师就是个搞光学的。
N****p
发帖数: 1691
6
来自主题: PhotoGear版 - 135L和85L虚化能力好像差不多?
你的公式不对
DOF和 (距离/焦距)的平方成正比,和光圈的一次方成正比,
所以相同距离,DOF的比值是3.6倍;相同照片的话,大光圈的DOF浅。
另外虚化能力和镜头的spherical abberation有关,SA越强,虚化越强,这也是个
Trade Off。
包子
c********y
发帖数: 30813
7
来自主题: PhotoGear版 - 105DC开了Defocus Control有点跑焦
nikon自己说的
http://imaging.nikon.com/lineup/lens/glossary.htm#dc
“AF DC-NIKKOR lenses feature exclusive Nikon Defocus-image Control
technology. This allows photographers to control the degree of spherical
aberration in the foreground or background by rotating the lens' DC ring.
This will create a rounded out-of-focus blur that is ideal for portrait
photography. No other lenses in the world offer this special technique.”
t****g
发帖数: 35582
8
平面对球面wavefront, 球面对平面wavefront,减小spherical abberation。
用singlet的话,其实最好的平面那边也有小小的convex 曲率。参考thorlabs的best
shape singlet简洁。
再好一点就用一片非球。
不过如果你detector不是个针孔没必要。
n**b
发帖数: 13203
9
来自主题: PhotoGear版 - 富士鸡血,YES!!!
Fujifilm Introduces First Compact System Camera
Greg Tarr Released : Tuesday, January 10, 2012 12:01 AM
The new models include the X-Pro1, X-S1 (shipping this month at an expected
$800 suggested retail) and a new F series model in the F750EXR (shipping in
March at an expected $350). The highlight of the offerings is the Fujifilm X
-Pro1, which is a highly featured compact system camera. Fuji-filim said it
will build on the success of the X100 model, by adding a camera that
features a custom-deve... 阅读全帖
b*******t
发帖数: 33714
d*****0
发帖数: 68029
11
【 以下文字转载自 Military 讨论区 】
发信人: laodou (别拿豆包不当干粮), 信区: Military
标 题: 武汉大学80后美女袁荃教授走红
发信站: BBS 未名空间站 (Wed Feb 29 14:21:37 2012, 美东)
姓 名: 袁 荃 Yuan _ Quan
出生年月:1982年2月
学历: 博士, 教授
专业方向:分析化学
电 话:
Email:y*********[email protected]
教育与研究经历
2000年9月– 2004年7月:武汉大学化学学士学位
2004年9月– 2009年7月:北京大学无机化学博士学位导师:严纯华院士
2009年9月-2011年12月:佛罗里达大学化学系博士后谭蔚泓教授课题组
2011年12月-现在:武汉大学化学学院教授
代表性成果
1.Quan Yuan, Yun-Fei Zhang, Ruo-Wen Wang, Chao-Lin Du, Emir Yasun, Yan Chen,
and Wei-Hong Tan* “Using Silver Nanowire Antennas to Enhance th... 阅读全帖
f**s
发帖数: 968
12
链接在此:
http://www.kenrockwell.com/tech/8mm-f35.htm
8mm f/3.5 Fisheye
Pro-Optic, Samyang, Rokinon, Bower &c. (2009-)
© 2010 KenRockwell.com. All rights reserved.
Intro Specs Performance Compared Recommendations
8mm f/3.5 Fisheye, Pro-Optic Nikon AI-s version. enlarge. ($290, Korean, no
filters, 13.8 oz./391g). This one came from this link to it at Adorama (also
specifically in Nikon, Canon EOS, Pentax/Samsung and Minolta Maxxum/Sony
mounts). It also comes branded as Bower, also specif... 阅读全帖
s********e
发帖数: 2783
13
来自主题: PhotoGear版 - Sigma 150-600S Review
http://www.lenstip.com/index.php?test=obiektywu&test_ob=417
【Summary】
+ Pros:
very solid, weather sealed casing,
excellent image quality in the frame centre for the whole range of apertures
and focal lengths,
good performance on the edge of the APS-C/DX,
low chromatic aberration,
spherical aberration corrected without reservations,
negligible distortion,
very good coma correction,
imperceptible astigmatism,
low vignetting on the APS-C/DX sensor,
efficient and silent autofocus.
- Cons:
work again... 阅读全帖
y*b
发帖数: 3190
14
$150 Opteka 6.5mm f/3.5 HD Aspherical Fisheye Canon Nikon
http://slickdeals.net/f/7688379-150-opteka-6-5mm-f-3-5-hd-asphe
Opteka也是三阳马甲?
4.5 *'s out of 78 amazon customer reviews
Opteka 6.5mm f/3.5 HD Aspherical Fisheye Lens with Removable Hood
Sold by 47th Street Photo and Fulfilled by Amazon [amazon.com]
List Price: $329.95
Price: $149.95 & FREE Shipping
Newly improved 2014, manual focus, digitally-optimized fisheye lens
Ultra-wide 6.5mm focal length
HD, super multicoated optics for the sharper... 阅读全帖
y*b
发帖数: 3190
15
来自主题: PhotoGear版 - Sony RX100 M4 Leaked Specification
zz
"We have just received first set of RX100 M4 specification by a new source,
take a look at the rumored specification below..
New or improved stuff in the RX100 iv rr RX100 m4 is:
– 4k Video at 30 FPS (that one is an easy one)
– Improved Zoom to 24-100mm (just over 4x zoom range)
– Articulated Touch screen with touch screen focus – but still no touch
menu
– restyled button layout – now with 2 dials on top (similar to the a6000)
– New and improved sensor with spherical shape and phase Autofocus... 阅读全帖
J********o
发帖数: 17447
16
来自主题: PhotoGear版 - Sony RX100 M4 Leaked Specification
New and improved sensor with spherical shape 就试水了?
y*b
发帖数: 3190
17
来自主题: PhotoGear版 - Sony RX100 M4 Leaked Specification
估计不是spherical, 那个可能要看rx2
s******y
发帖数: 28562
18
来自主题: Joke版 - 2015物理学年会上的福音

Abstract: X2.00009 : Disproof of Big Bang's Foundational Expansion Redshift
Assumption Overthrows the Big Bang and Its No-Center Universe and Is
Replaced by a Spherically Symmetric Model with Nearby Center with the 2.73K
CMR Explained by Vacuum Gravity and Doppler Effects
H********g
发帖数: 43926
19
说是太阳系里有个叫做Oort云的东西,就是彗星的云存储,里面无数的潜在彗星,而且
基本是包着太阳系的(跟行星们共面的地方密度高一些),所以理论上任何方向看到彗
星都是有可能的 。
The Oort cloud is thought to occupy a vast space from somewhere between 2,
000 and 5,000 AU (0.03 and 0.08 ly)[90] to as far as 50,000 AU (0.79 ly)[71]
from the Sun. Some estimates place the outer edge at between 100,000 and
200,000 AU (1.58 and 3.16 ly).[90] The region can be subdivided into a
spherical outer Oort cloud of 20,000–50,000 AU (0.32–0.79 ly), and a
doughnut-shaped inner Oort cloud of 2,000–20,... 阅读全帖
r*s
发帖数: 2555
20
来自主题: Joke版 - 诺委会太不像话了
尼玛87篇参考文献就不能加一篇施教授或能教授的CNS?
References
1. Ruska, E., Nobel Lectures, Physics 1981-1990, Tore Frängsmyr and
Gösta Ekspong, Eds. (1993) World Scientific Publishing, Singapore
2. Marton, L. (1934) Electron microscopy of biological objects. Nature
133, 911-911
3. Althoff, T., Mills, D. J., Popot, J. L., and Kühlbrandt, W. (2011)
Arrangement of electron transport chain components in bovine mitochondrial
supercomplex I1III2IV1. The EMBO Journal 30, 4652-4664
4. Letts, J. A., Fied... 阅读全帖
H********g
发帖数: 43926
21
看到的毛病有:
1 滥用the 很多the都是多余的 比如摘要里sem前面那个 the疑似多余 xrd前面那
个the 肯定多余
2 滥用 分号 有时候一边用分号一边用and 不知道并列的单元有多长 谁跟谁并列
是不是跟那条毛蛇一样
摘要里 ; and 那里 用了分号就不该用and了。
http://theoatmeal.com/comics/semicolon
3 用词不当 比如摘要第一句 this study is to present... 应该是this study is
to investigate.. 或者this article is to present 此外正文里还有spherically
shape这样的简单错误
申请各种东西的时候可能多数时候人家只数paper或者只看看标题 但是有时候会看不
懂标题 来看看摘要 所以摘要一定要干净
x********u
发帖数: 15396
22
来自主题: pets版 - about vaccines
not a short article, but it's worth reading it
http://healthypets.mercola.com/sites/healthypets/archive/2013/1
Is Your Pet Receiving Any of These Useless Vaccines?
By Dr. Becker
Today I have a very special guest returning for a second time to talk with
us and give us the tremendous benefit of his knowledge, Dr. Ronald Schultz.
Dr. Schultz heads up the Department of Pathobiological Sciences at the
University of Wisconsin-Madison School of Veterinary Medicine. He’s joining
me today on behalf of an... 阅读全帖
B********e
发帖数: 19317
23
来自主题: Belief版 - 达尔文如何看待进化论 (转载)
发信人: GetThere (学了也无术), 信区: TrustInJesus
标 题: Re: 达尔文如何看待进化论
发信站: BBS 未名空间站 (Wed May 12 13:23:59 2010, 美东)
看看达尔文的全文自己怎么说:
First Edition -- 1859
To suppose that the eye, with all its inimitable contrivances for adjusting
the focus to different distances, for admitting different amounts of light,
and for the correction of spherical and chromatic aberration, could have
been formed by natural selection, seems, I freely confess, absurd in the
highest possible degree.
Yet reason tells me, that if nume
M******n
发帖数: 43051
24
来自主题: Belief版 - 新约和旧约内容差异疑议
The first, termed Proto-Isaiah (chapters 1–39), contains the words of the
8th-century BCE prophet with 7th-century BCE expansions; the second, Deutero
-Isaiah (chapters 40–55), is the work of a 6th-century BCE author writing
near the end of the Babylonian captivity.
-- from wiki
另外,圣经上只说了地球是round,没说spherical。直到公元7世纪圣依西多禄编写的
著名的《词源》仍然认为地球是个圆形的碟子。
m****r
发帖数: 1904
25
来自主题: Belief版 - 新约和旧约内容差异疑议
一个姐妹的回答
“There was a question from readers many years ago that addressed the idea
of flat, but round. (67/11/1 wt) It went to Job 22:14, where the same
Hebrew word, chugh, is used, but translated "Vault". A vault is
hemispherical, like 1/2 a globe. The earth has its other hemisphere's half
below where we stand, making a 3D circle. Back to Isaiah 40:22: Moffatt
translation says "He sits over the round earth", and the Catholic Douay
Version says, "It is he that sittith upon the globe of the ... 阅读全帖
m****r
发帖数: 1904
26
来自主题: Belief版 - 新约和旧约内容差异疑议
The Bible’s Harmony With Scientific Facts. The Bible, at Job 26:7, speaks
of God as “hanging the earth upon nothing.” Science says that the earth
remains in its orbit in space primarily because of the interaction of
gravity and centrifugal force. These forces, of course, are invisible.
Therefore the earth, like other heavenly bodies, is suspended in space as if
hanging on nothing. Speaking from Jehovah’s viewpoint, the prophet Isaiah
wrote under inspiration: “There is One who is dwelling above t... 阅读全帖
y****i
发帖数: 1265
27
【 以下文字转载自 Military 讨论区 】
发信人: thinknet (我是云), 信区: Military
标 题: 中国打造500m口径球面射电望远镜 世界之最
发信站: BBS 未名空间站 (Thu Dec 23 13:20:09 2010, 美东)
12月21日,中航工业贵州云马飞机制造厂运用航空制造技术,成功完成了FAST项目12米
相似三角形的铝合金面板验证模型制造。该模型由100个1.2米等边三角形构成,每个等
边三角形三个交点孔位置精度保持在0.1-0.15mm。该模型的成功制造,标志着云马厂在
走向参与规划建设目前世界上最大的、具有500米口径球面射电望远镜(Five hundred
meters Aperture Spherical Telescope,简称FAST)的工作中迈出了重要一步。
据悉,FAST是国家科教领导小组审议确定的国家九大科技基础设施之一,2007年7
月10日,经国家发改委正式批复FAST立项后进入可行性研究阶段。由中国科学院和贵州
省人民政府共同建设。建设周期以开工报告通过之日起约5.5年。该项目拟采用我国科
学家独创的设计和我国贵... 阅读全帖
b*******s
发帖数: 5216
28
“The 1841 Mountain Howitzer is a type of bronze smoothbore 12 pounder,
optimized for firing explosive shells as well as spherical case and canister
.”
http://en.wikipedia.org/wiki/M1841_Mountain_Howitzer
G******e
发帖数: 9567
29
来自主题: TrustInJesus版 - 达尔文如何看待进化论
看看达尔文的全文自己怎么说:
First Edition -- 1859
To suppose that the eye, with all its inimitable contrivances for adjusting
the focus to different distances, for admitting different amounts of light,
and for the correction of spherical and chromatic aberration, could have
been formed by natural selection, seems, I freely confess, absurd in the
highest possible degree.
Yet reason tells me, that if numerous gradations from a perfect and complex
eye to one very imperfect and simple, each grade being useful to
G******e
发帖数: 9567
30
来自主题: TrustInJesus版 - 达尔文如何看待进化论
1872年第六版, as new or better information became available Darwin altered
his views and his text.
Sixth Edition -- 1872
Organs of extreme perfection and complication.
To suppose that the eye with all its inimitable contrivances for adjusting
the focus to different distances, for admitting different amounts of light,
and for the correction of spherical and chromatic aberration, could have
been formed by natural selection, seems, I freely confess, absurd in the
highest degree. When it was first said
D*****r
发帖数: 6791
31
来自主题: TrustInJesus版 - [转载] The Improbability of God
Much of what people do is done in the name of God. Irishmen blow each other
up in his name. Arabs blow themselves up in his name. Imams and ayatollahs
oppress women in his name. Celibate popes and priests mess up people's sex
lives in his name. Jewish shohets cut live animals' throats in his name. The
achievements of religion in past history -- bloody crusades, torturing
inquisitions, mass-murdering conquistadors, culture-destroying missionaries,
legally enforced resistance to each new piece of ... 阅读全帖
S********t
发帖数: 616
32
来自主题: TrustInJesus版 - 在无机地球时代的神。
现代物理学就是个“spherical chickens“的时代。别说描述一个活鸡不可能,更别说
是人,人的意识,和宗教了。你说的那些火花,别说不代表现代物理. 就算是,你觉得
你可以用人的认识来理解神,这个造物主吗? 基本逻辑都错了。唉。。。
W***q
发帖数: 152
33
来自主题: TrustInJesus版 - Commentary on Genesis Chapter 1 (4)
2. (1) A simple factual statement regarding God work as creator.
In the beginning God created the heavens and the earth.
a. God created: This summary statement will be detailed in the following
verses, but the Bible simply and straightforwardly declares the world did
not create itself or come about by chance. It was created by God, who, by
definition, is eternal and has always been.
i. “It is no accident that God is the subject of the first sentence
of the Bible, for this word domina... 阅读全帖
l*****a
发帖数: 38403
34
早在你的圣经前奏有Spherical Earth论了,
http://en.wikipedia.org/wiki/Spherical_Earth
跳大神的,基督徒见神见鬼的和犯癔病的有啥不同?要讲什么超自然,拿出来个断肢重
生,你们这些基喝毒药不受害的例子就成,拿不出来对不?
w**********1
发帖数: 2588
35

Spherical Earth 公元前6世纪
约伯记 公元前1657年到公元前1473年之间
以赛亚书 大约在公元前723年之后完成
跟犯癔病的有啥不同? 你能证明跳大神跟犯癔病一样么?
喝毒药不受害的例子,圣经上就记载了,是你自己不信。
所以,如果我说我见到了有基督徒喝毒药不受害,你就信么?
按你的思维逻辑,就算你亲眼见到了,也会怀疑是不是毒药的质量有问题。
h***s
发帖数: 1716
36
来自主题: Wisdom版 - 我发个善心,说句公道话
这个今年5月有NATURE上的一篇关于电子形状的的最新实验进展和报道. 况且这是人成
千上万没有搞M理论的实验物理学家的真刀真枪干出的事, 不关他们美丽的绳子和M理论
什么事.
Improved measurement of the shape of the electron
http://www.nature.com/nature/journal/v473/n7348/full/nature1010
Improved measurement of the shape of the electron
J. J. Hudson,1 D. M. Kara,1 I. J. Smallman,1 B. E. Sauer,1 M. R. Tarbutt1 &
E. A. Hinds1
AffiliationsContributionsCorresponding author Journal name:
Nature
Volume:
473,
Pages:
493–496
Date published:
(26 May 2011)
DOI:
doi:10.1038/nature10104
Rece... 阅读全帖
Y**u
发帖数: 5466
37
☆─────────────────────────────────────☆
heyes (hoooyou) 于 (Fri Aug 12 13:21:56 2011, 美东) 提到:
佛就是佛,道就是道,是修生养性,和人生和哲学扯扯还行。
不要再和什么爱因斯坦,量子力学,薛定谔猫啊狗的瞎联系了,好不好?再这么下去,
你们要把人类所有的光辉成果都给吞食到佛的肚子里了,还怎么个这个空空,那个空的
呢?这种文章都mark实在太。。。佛告诉我,沉默是真空。所以我就不沉默了。
如果你们硬要扯人类的光辉思想是佛早就知道的,我来问你们那些自以为懂猫啊狗的一
个问题。回答这个问题不是你们那种马后炮就可以蒙混过去的,要真刀真枪干的。
哦,老爱已经做了相对论了,你们偷过来这么一说,就成佛的“预见”了?人物理学家
辛辛苦苦几代搞的量子力学,你这一猫啊狗的一吹,就又成佛“早就知道”的了?蛋不
是这么扯的,慧根不是这么修炼的吧?
好吧,问题来了,很简单。
“请问人能不能回到(时间)的过去?”
请给出佛的答案,看看佛会不会早已经预料到了物理学家的“光辉思想”(以后或者将
来,或者佛说没有过去,现在和未... 阅读全帖
A****i
发帖数: 5546
38
【 以下文字转载自 Travel 讨论区 】
发信人: phos (循仁启仕), 信区: Travel
标 题: 三人行2012夏日之四斯德哥尔摩Day One
发信站: BBS 未名空间站 (Sat Nov 3 21:52:58 2012, 美东)
Silja渡轮17:00离开,第二天09:30抵达斯德哥尔摩。
有点cruise的意思,不过除了看show不用钱,其他都得付费。晚饭自助餐虽然价格不菲
,但品种还算丰富,酒精饮料随便喝。按北欧/瑞典的物价来计,非常合算。
进入Stockholm,得穿过Stockholm archipelago无数的岛屿。
停泊码头在外围的Värtahamnen。来之前已经买好两天的Stockholm Card。虽然两
大一小要200多美金,但非常值(还是那句'按北欧/瑞典的物价来计')。
这两晚旅馆是Skeppsholmen岛上的STF af Chapman Hostel。'按北欧/瑞典的物价来计'
, 这个青旅可以说'地'美价廉。
在Skeppsholmen上看Gamla stan(旧城) 。
StrandvagenWaterfront ... 阅读全帖
w********1
发帖数: 3492
39
Wed, 27 Jun 2012 10:40:31 PDT
At its Google I/O conference today, Google unveiled several new products
intended to compete in the tablet and home entertainment markets, squarely
targeting Apple's iPad and its rumored push into the living room for which
the Apple TV has served as a foothold.
Google's presentation began with a spotlight on Android, noting that it is
now activating more than one million Android devices per day and showing off
Android 4.1 "Jelly Bean". The new version of the operat... 阅读全帖
r*a
发帖数: 1503
40
如果你又他们的经纬度,那就很简单了,有数学公式一算就可以了。维基上又公式的。
Spherical-surface formulae in https://en.wikipedia.org/wiki/Geographical_
distance
如果你没有经纬度,那么你要通过GEOCODING服务,把他们的经纬度给算出来,然后再
计算距离。
s*****t
发帖数: 1994
41
A Twisted Meteor Train
Credit and Copyright: Jimmy Westlake (Colorado Mountain College)
Explanation: Did this meteor leave a twisting path? Evidently. Meteor trains that twist noticeably are rare - and even more rarely photographed - but have been noted before. The underlying reason for unusual meteors trains is that many meteors are
markedly non-spherical in shape and non-uniform in composition. Meteors, usually sand sized grains that originate in comets, will disintegrate as they enter the Ear
o****e
发帖数: 1011
42
来自主题: Biology版 - 问个比较弱的SEC问题
蛋白的SEC retention time不仅跟蛋白的分子量大小有关系,跟蛋白分子的shape(
spherical, rod-like)也有关系。
l**********1
发帖数: 5204
43
//www.ncbi.nlm.nih.gov/pubmed/21050804
浮黴菌門
Isosphaera屬
//hamap.expasy.org/proteomes/ISOPI.html
Species: Isosphaera pallida (strain ATCC 43644 / DSM 9630 / IS1B)
Species code: ISOPI
Taxonomy: Bacteria; Planctomycetes; Planctomycetia; Planctomycetales; Planctomycetaceae; Isosphaera
(TaxID: 575540) [NEWT/ NCBI]
Description: Isosphaera pallida strain IS1B was isolated from a hot spring in Kah-nee-tah, Oregon, USA.
It is the only budding bacterium known to glide and the only heterotrophic bacteriu... 阅读全帖
l**********1
发帖数: 5204
44
En
温习一下 其十一年前的豪言 啊
中国科学:显著的发展和严峻的挑战
——历史演变和现状比较
于2001年12月4日 1st version
饶毅
本文在简要回顾中国科学史的基础上,介绍一些近年研究的内容,肯定中国
科学令人乐观的进步,并讨论可能的意义。同时也指出,中国优秀论文总量仍不
到世界的百分之一,低于中国经济在世界所占的百分比、也不能适应中国持续发
展的要求。中国科学的规模需要相当程度的扩大、质量有待进一步提高。中国科
技还存在面临许多问题和挑战。
中国科学历史上的优秀例子
一个国家科学研究状况可以近似地由发表论文的情况所反映。以下,本文主
要从生命科学的研究来讨论中国科学的情况,一方面这是我有一定判断力的领域,
另一方面生命科学是科学技术最重要的组成部分之一,可以反映科学主流。讨论
中国论文发表情况前,先谈两个背景:中国科学的历史情况,优秀科学和著名杂
志的关系。
奠定中国生命科学研究是二、三十年代协和医学院生理系林可胜和生化系吴
宪。他们不仅自己研究出色,而且培养和带领了其他研究者。林可胜在胃肠道生
理和神经生理有优秀工作。1942年,他在中国当选为美国科学院外籍院士,是... 阅读全帖
l********k
发帖数: 14844
45
来自主题: Biology版 - 想请教一下关于显微镜的问题
A comparison of imaging ray traces that occur between the specimen and
immersion objectives (both oil and water) is presented in Figure 3, along
with a geometric model prediction of an x-z image for a fluorescent bead 100
micrometers below the interface in aqueous media. In Figure 3(a), the
sphere on the left represents the actual shape of the fluorescent bead,
while the elongated shape on the right is the impression provided by imaging
with an oil immersion objective. Ray traces (yellow arrows ... 阅读全帖
s******y
发帖数: 28562
46
另外,在我对abbe equation 的理解中,这个公式有两项,一个是视椎角度,
这个就是我说的那个光线弯曲的问题(就是用油当介质可以增加有效的视椎
角度,这个是我给你的第一个回答的意思)。
另外一个是你问的这个n. 这个在物理学的角度可以这样理解,镜头通过介质和
盖薄片在看一个Airy disk的虚像,如果玻璃两侧的介质是一样的话,那么
这个Airy disk 的像的有效半径就应该是lambda/2n。
另外你说的那个abberation correction其实是误会我在说spherical
aberration correction吧?这个和油有关,但是和我所说的那个并不是完全
一会事。有些时候,因为镜头本身不够圆而出现光线折射角度不对的问题的时候,
人们会故意调节油的折射率来引入额外的折射度来纠正这个问题。这个和N.A.
以及我一直说的问题没有关系。我一直强调的就是,在我的印象中(很模糊的,
大学时候学光学得到的印象了,不一定准确)这个N.A.推导的时候是用玻璃
两面介质一样的情况下得到的公式,不可以直接套用不同介质的情况。
我举出这个水溶液中的活体细胞就是为了说明这个事情。... 阅读全帖
t*d
发帖数: 1290
47
来自主题: Biology版 - better way to conquer cancer
IMHO, to find novel drug delivering methods might be better ways to conquer
cancer comparing to studying the mechanisms of cancer initiation and
progression.
Nature 491, S58–S60 (22 November 2012)
Nanotechnology: Carrying drugs
When Joseph DeSimone makes nanomedicines, he compares himself to a baker. He
mixes drugs with different chemical 'batters', puts them in tiny moulds,
cures them and then turns them out. He can mould almost any shape: discs,
cubes, long sticks, roughened doughn... 阅读全帖
s******y
发帖数: 17729
48
来自主题: Biology版 - 诺委会太不像话了 (转载)
【 以下文字转载自 Military 讨论区 】
发信人: rbs (jay), 信区: Military
标 题: 诺委会太不像话了 (转载)
发信站: BBS 未名空间站 (Wed Oct 4 10:58:51 2017, 美东)
发信人: rbs (jay), 信区: Joke
标 题: 诺委会太不像话了
发信站: BBS 未名空间站 (Wed Oct 4 10:23:52 2017, 美东)
尼玛87篇参考文献就不能加一篇施教授或能教授的CNS?
References
1. Ruska, E., Nobel Lectures, Physics 1981-1990, Tore Frängsmyr and
Gösta Ekspong, Eds. (1993) World Scientific Publishing, Singapore
2. Marton, L. (1934) Electron microscopy of biological objects. Nature
133, 911-911
3. Althoff, T., Mi... 阅读全帖
a****n
发帖数: 3082
49
来自主题: Chemistry版 - paper help please
Nature 266, 417-421 1977
Comparative neutron small-angle scattering study of small spherical RNA
viruses
B. Jacrot*, C. Chauvin* & J. Witz†
http://www.nature.com/nature/journal/v266/n5601/pdf/266417a0.pdf
y*******n
发帖数: 127
50
来自主题: Chemistry版 - 求助文献2篇
第一篇:Adhesion of Latex Spheres to Giant Phospholipid Vesicles: Statics and Dynamics
http://jp2.journaldephysique.org/index.php?option=article&access=doi&doi=10.1051/jp2:1997208
第二篇:Motion of a massive microsphere bound to a spherical vesicle
http://www.iop.org/EJ/abstract/0295-5075/40/4/405
我的email:j********[email protected]
非常感谢!
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