h********0
发帖数: 12056 | 1 所有学过高粱，学过多体理论，学过量子场论都知道，这是老东西，没有任何神秘。
名字本身是一个历史错误，不过也没什么，一般新的场论书也不提这个术语了。 |
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S****8
发帖数: 401 | 2 你说的没错，我也不觉得神秘，现在教授一般上来就说这个名字不对。
但是物理系出身的有多少人在实际课题中需要用到它呢，我个人对理论的理解是在推公
式写code的过程中慢慢理解的，当然有些理解肯定会不恰当，现在的问题是，我无法有
效地跟物理系的phd在这些个人理解上进行沟通讨论，可能我找的人不对，所以我想知
道一般物理系啥方向的对这个理解比较透彻。 |
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H*****8
发帖数: 175 | 3 把A. Fetter那本多体物理的书前3章拿来翻一翻就懂了。搞凝聚态物理的人也分为两类
：一类是不会场论的（大约是搞材料计算之类的），一类是精通场论的（大约是搞高温
超导之类的）。 |
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h**********e
发帖数: 4328 | 6 啥叫懂呢
要是搞理论的phd至少写（绝大部分）文章都得给一哈密吨粮吧
那知道产生湮灭算符合博色杯米对已足够半导体器件的缄默了吧 |
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w******g
发帖数: 202 | 7
我见过一中国人（丫自称是搞计算的，不配做理论的），在维也纳拿的phd，写code很
厉害，有一次跟他聊到过二次量子化，感觉理解得比较深。 |
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E*******1
发帖数: 3464 | 9 高温超导有个屁理论，做高温超导理论的首先就没有几个，其次基本上是和计算物理结
合起来的，和传统BCS那一套相差甚远 |
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S****8
发帖数: 401 | 10 不够，理论半导体器件物理里面二次量子化一般要跟密度矩阵一起用，理解的好不好还
是很重要的 |
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H*****8
发帖数: 175 | 11 那我就说zhangshoucheng的SO(5)，好不啦 |
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H*****8
发帖数: 175 | 12 这个东西本来是个物理的PhD都应该懂的，至少概念上要懂。懂得是本分，不懂那就是
不合格。 |
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H*****8
发帖数: 175 | 13 如果你语文没学好，建议你回去好好补习一下阅读理解。我说“很大一部分做高温超导
理论的”。第一，我并没有说做高温超导理论的人很多；第二，你说的和计算结合起来
的，就是我说的“材料计算”。
至于你说高温超导“有个屁理论”，我想这个不用你说，地球人都知道。“有个屁理论
”不等于不要去做那个理论。 |
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h********0
发帖数: 12056 | 16 的确高温超导没什么理论。懂二次量子化不需要研究高温超导。
我们上研究生的时候理论物理学生都学过。 |
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H*****8
发帖数: 175 | 17 二次量子化本来就是一个不需要的概念，用场的量子化就可以了。 |
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L*m
发帖数: 235 | 18 2015诺贝尔物理奖
获奖人：Arthur B McDonald、Takaaki Kajita
获奖领域：实验高能物理
获奖原因：发现了中微子震荡，并因此证明了中微子具有质量
相关文章
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Q. R. Ahmad et al. (SNO Collaboration)
Phys. Rev. Lett. 87, 071301 – Published 25 July 2001
Direct Evidence for Neutrino Flavor Transformation from Neutral-Current
Interactions in the Sudbury Neutrino Observatory
Q. R. Ahmad et al. (SNO Collaboration)
Phys. Rev. Lett. 89, 011301 – ... 阅读全帖 |
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l*********s
发帖数: 10 | 19 I dare myself to conjecture that although Dirac is the
first one who have the idea of Path Integral Formulism
of Quantum Mechanics and Fields, but since he haa already
got his Canonical Quantization Formulism, why bother to
set up another "equavelent" one? So he left it to the
other Physicists, and Feynman is the lucky one who picked
up the idea and fulfiled it. After all, the first time
Path Integral Formulism show its power is in the proving
of renormalizability of Gauge Fields (1999 Noble Pri |
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s**e
发帖数: 103 | 20
actually there are couple of new developments (they call string revolution).
One is the use of D-branes (a extended object to break the symmetry). The other
is the discovery of the possibility of consistant string theories with
chiral interaction.
But I think the major reason for the revival of string theory is the unsuccessful
trial of a grand unified quantum field theory, failure to quantize gravity
and there is nothing left to do in particle physics. :o) |
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M*********m
发帖数: 2024 | 21 You must have seen this sort of things before. For free electron gas, if you
apply magnetic field to it, the orbital angular momentum around the magnetic
field is quantized. Since the electron number is conserved, so the density of
state changes from a parabolic to steps. It was proposed by L.D. Landau in
1930 and was measured by de Haas and van Alphen at the same year. For HTSC,
the electrons are considered mainly confined in 2D cuprate layer, and
therefore the Landau levels are co-centric circ |
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F******n
发帖数: 160 | 22 To talk about the quantization of time in quantum mechanics, it definitely
benefits to briefly review the background on general issues about "time" in
quantum mechanics and the plcae where the problem took its origin. I am not
quite familiar with the research on this topic and can only give a brief
review, plus some of my own ad hoc thoughts without much cautious analysis.
1. Introduction -- Why Do People Care?
Time in quantum mechnics was from the beginning a controversial subject.
There ar |
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a******1
发帖数: 201 | 23 1. Only professionals can define the variation in your case, the data
analysts can't. Since you are asking the question with the correlation
coefficient, I assume that as a professional in your field (biology?), you
know that is being used to quantize the variation.
2. In your case, you have two samples with size of 45 and 28, and you would
like to compare the means. The classic and best approach is to use t-test as
suggested. But please note that the each sample does not consists of
independent... 阅读全帖 |
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a*i
发帖数: 1652 | 24 http://en.wikipedia.org/wiki/Corrective_and_preventive_action
Corrective and preventive action (CAPA, also called corrective action /
preventive action) is a concept within good manufacturing practice (GMP).
CAPA focuses on the systematic investigation of discrepancies (failures and/
or deviations) in an attempt to prevent their recurrence (for corrective
action) or to prevent occurrence (for preventive action). To ensure that
corrective and preventive actions are effective, the systematic
inves... 阅读全帖 |
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F***Q
发帖数: 6599 | 25
this may be true, but my point stands - collision scores are not the most
important factors when considering an EV.
buying a newer model will almost always be better in terms of safety (IIHS
scores may not reflect all the improvements because of its quantized nature)
, especially given increasing federal mandates. |
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e****r
发帖数: 166 | 26 did you try highend2d? not sure though. |
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