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全部话题 - 话题: aperiodic
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s*********1
发帖数: 1166
1
Wang Hao, also Hao Wang (Chinese: 王浩; pinyin: Wáng Hào; 20 May 1921 –
13 May 1995) was a Chinese American logician, philosopher and mathematician.
Born in Jinan, Shandong, in the Republic of China (today in the People's
Republic of China), Wang received his early education in China. After
obtaining a B.Sc. degree in mathematics from the National Southwestern
Associated University in 1943 and an M.A. in Philosophy from Tsinghua
University in 1945, he moved to the United States for further graduat... 阅读全帖
f******k
发帖数: 297
2
来自主题: ClassicalMusic版 - 大家认为表现力最强的乐器是啥
misunderstanding le. i was just questioning why wings only
say jigsaw is the best, and whether it is meaningful. random
waveform can also be temporally limited so it can be expanded
periodically, so in that sense you have fundemental freqz,
and so on. i think i did not say aperiodic signal.
next time do not use heavy words, hoho.
i******l
发帖数: 268
3
答案是1260。如果不考虑六个面的旋转对称的话,答案是315
谷歌是术板最大的法宝
数字在这里给出
http://aperiodical.com/2014/03/how-to-solve-a-rubiks-cube-in-on
具体分析在这里给出,注意77-79页
https://people.kth.se/~boij/kandexjobbVT11/Material/rubikscube.pdf
z******g
发帖数: 23
4
来自主题: BuildingWeb版 - Need more free books.;)
Join mail list http://www.netdoors.net,
we will send the free book's aperiodic.
z******g
发帖数: 23
5
来自主题: Database版 - need more free books
Join mail list http://www.netdoors.net,
we will send the free book's aperiodic.
z******g
发帖数: 23
6
来自主题: Java版 - need more free books.
Join mail list http://www.netdoors.net,
we will send the free book's aperiodic.
a*****x
发帖数: 901
7
来自主题: Biology版 - 给民科同学贴个鼓励帖 (zz)
http://www.popsci.com/science/article/2011-10/chemist-accused-q
Chemist Once Accused of 'Quasi-Science' Wins Nobel For Quasicrystal
Discovery
By Rebecca Boyle Posted 10.05.2011 at 12:11 pm 33 Comments
Quasicrystal Atomic Model This is an atomic model of a silver-aluminum
quasicrystal. Wikipedia
Vindication has to be one of the most satisfying effects of a Nobel Prize
win — after years of work, the scientific community has finally recognized
the real weight of a discovery someone probably fought ... 阅读全帖
a******e
发帖数: 7
8
这个笑话确实很经典,而且很深刻。我们物理系的学生都称它为---物理学家的球形鸡。
另外,你说物理/数学家开始的时候比较蔑视生物ist。我自己作为理论物理背景的人转
到生物学,过程中确实有一丁点这样的想法。可是这只是硬币的一面,硬币的另一面你
却没有看到---物理学家面对生物这个超级强关联的aperiodic crystal(薛定谔语)深
深地恐惧!
a******e
发帖数: 7
9
这个笑话确实很经典,而且很深刻。我们物理系的学生都称它为---物理学家的球形鸡。
另外,你说物理/数学家开始的时候比较蔑视生物ist。我自己作为理论物理背景的人转
到生物学,过程中确实有一丁点这样的想法。可是这只是硬币的一面,硬币的另一面你
却没有看到---物理学家面对生物这个超级强关联的aperiodic crystal(薛定谔语)深
深地恐惧!
G****e
发帖数: 11198
10
来自主题: Chemistry版 - 2011 Nobel Prize in Chemistry
http://www.nobelprize.org/nobel_prizes/chemistry/laureates/2011
Press Release
5 October 2011
The Royal Swedish Academy of Sciences has decided to award the Nobel Prize
in Chemistry for 2011 to
Daniel Shechtman
Technion - Israel Institute of Technology, Haifa, Israel
"for the discovery of quasicrystals"
A remarkable mosaic of atoms
In quasicrystals, we find the fascinating mosaics of the Arabic world
reproduced at the level of atoms: regular patterns that never repeat
themselves. However, the con... 阅读全帖
b*******t
发帖数: 164
11
Q: just now. You said that convolution in time domain is corresponding to
multiplication in frequency
domain. This is for continuous time. How about the property for discrete
time signal?
A: the circled convolution in time domain is related to multiplication in
frequency domain.
The question is not correct. linear convolution is for continuous frequency
(continuous time aperiodic signal and discrete time signal), circular
convolution is for discrete time and discrete frequency.

原因
g******s
发帖数: 733
12
http://www.edphoton.com/Aperiodic_Volume_Optics.htm
最近美国科罗纳多大学电子与计算机工程系的研究人员Rafael Piestun及其合作者在光
电子领域的顶级杂志《Nature Photonics》上发表的《非周期体积光学》(Aperiodic
Volume Optics)提出了一种三维光学元件。这种非周期的三维光学元件将极大地提高传
统的二维衍射光学和计算全息元件的设计自由度。(http://www.edphoton.com
在多维空间上对光的控制是光子设计的核心,包括在三维空间和时间上控制光的功率分
布,光谱,相干性以及偏振态等。最近数年兴起的光子晶体,超材料和衍射光学器反应
了这一设计思想。 相比之下,目前的衍射光学和计算全息元件是一种两维的光学元件
。(http://www.edphoton.com
衍射光学和计算全息元件是对传统的折射光学元件和光学记录全息的一次革命。折射光
学元件包括我们使用的传统眼镜,照相机,望远镜,显微镜镜头等。衍射光学和计算全
息元件可以针对任意的输入光场产生一个任意的输出光场(功率密度分布和... 阅读全帖
g******s
发帖数: 733
13
http://www.edphoton.com/Aperiodic_Volume_Optics.htm
最近美国科罗纳多大学电子与计算机工程系的研究人员Rafael Piestun及其合作者在光
电子领域的顶级杂志《Nature Photonics》上发表的《非周期体积光学》(Aperiodic
Volume Optics)提出了一种三维光学元件。这种非周期的三维光学元件将极大地提高传
统的二维衍射光学和计算全息元件的设计自由度。(http://www.edphoton.com
在多维空间上对光的控制是光子设计的核心,包括在三维空间和时间上控制光的功率分
布,光谱,相干性以及偏振态等。最近数年兴起的光子晶体,超材料和衍射光学器反应
了这一设计思想。 相比之下,目前的衍射光学和计算全息元件是一种两维的光学元件
。(http://www.edphoton.com
衍射光学和计算全息元件是对传统的折射光学元件和光学记录全息的一次革命。折射光
学元件包括我们使用的传统眼镜,照相机,望远镜,显微镜镜头等。衍射光学和计算全
息元件可以针对任意的输入光场产生一个任意的输出光场(功率密度分布和... 阅读全帖
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