c*******n
发帖数: 1648 | 1 Actually I am confused about the definition of temperatrue. I feel like I
didn't learn thermodynamics in college at all. Physical chemists may think
it's
stupid. begging for your answer!
We know that temperature is the average kinetic energy of the system. Say I
have a polymer (or say any liquid) at a constant temperature, and I apply very
high pressure to compress this liquid. Thermodynamically speak, there is no
change of the kinetic energy, which means that vibrational, rotational, and
transl |
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c*****e
发帖数: 238 | 2 Well, from Boltzmann statistics, you can easily derive the equipartition
principle, if there is an interaction part which is momenta independent
(e.g. two body potential), then you can not integrate out the momentum part
as they only enter in the hamiltonian as kinetic energy, so the equipartition
principle still holds for kinetic energy. If the interaction
part depends on the momentum, then we can not have the same result.
So I guess you are right. I was misleading. |
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D********g
发帖数: 533 | 3 来自主题: Macromolecules版 - 求推荐书 讲Absorption Kinetics的。
上次agostic推荐的Gregg的那本好像缪我想要看的内容。。。
主要是想搞清楚一个问题 就是Transport Limit Absorption的Kinetics
，Leveque Equation等等
谢谢了～ :) |
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N***r
发帖数: 2539 | 5 看了楼主的问题以及各位的回复，我也思考了一下。提几点建议。
1, 1.5x2x0.6 m 尺寸的tank，才1.8m^3的体积，流量4000gpm,相当于0.25m^3/s。我知
道进出平衡，但你的tank才能维持不到8秒的存储，直觉就是系统很不稳定。这么大家
伙，就得有大tank来稳定。
2, 1.5x2x0.6 m 尺寸的tank，4000gpm的流量，如果用16”的管道，进出口速度大概是
2m/s, 如果用6寸的管道，速度大概是14m/s。这种程度的混合，在tank里伯努利方程
基本上就不适用了。注意伯努利方程是通过对动量方程在连续流线上的积分得到的。
3, 反过来讲，如果你的tank很大，伯努利方程反而又能用了。不过仍然不应该用在
tank里，而是用在进（出）口水管核tank之间。一般来说，从进口管到tank，kinetic
energy认为被全部损失了，LOSS = K * (0.5 * rho * u * u) 并且 K＝1，从tank到出
口管K取0.5左右（取不同的值如果做roundup）。
4, CFD 可能有所帮助。
5, 4000gpm，得多大一泵啊。。。估摸着比... 阅读全帖 |
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N***r
发帖数: 2539 | 6 看了楼主的问题以及各位的回复，我也思考了一下。提几点建议。
1, 1.5x2x0.6 m 尺寸的tank，才1.8m^3的体积，流量4000gpm,相当于0.25m^3/s。我知
道进出平衡，但你的tank才能维持不到8秒的存储，直觉就是系统很不稳定。这么大家
伙，就得有大tank来稳定。
2, 1.5x2x0.6 m 尺寸的tank，4000gpm的流量，如果用16”的管道，进出口速度大概是
2m/s, 如果用6寸的管道，速度大概是14m/s。这种程度的混合，在tank里伯努利方程
基本上就不适用了。注意伯努利方程是通过对动量方程在连续流线上的积分得到的。
3, 反过来讲，如果你的tank很大，伯努利方程反而又能用了。不过仍然不应该用在
tank里，而是用在进（出）口水管核tank之间。一般来说，从进口管到tank，kinetic
energy认为被全部损失了，LOSS = K * (0.5 * rho * u * u) 并且 K＝1，从tank到出
口管K取0.5左右（取不同的值如果做roundup）。
4, CFD 可能有所帮助。
5, 4000gpm，得多大一泵啊。。。估摸着比... 阅读全帖 |
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m*******1
发帖数: 328 | 7 Generally speaking there are two types of motivations:.
Vision driven type:
(1) Age: Usually young <35 years old.
(2) Purposes: I would love to challenge myself in the residency because I
will dream to become XXX.
(3) Family burden: No family or light family burden.
(4) Spouse: Spouse-less or holding quite stable job (>80K/year)
(5) Family kinetics: Have a harmonious life with wife/husband.
(6) Performance in the residency: Usually better.
(7) Mottos: Live to work.
(8) IV numbers/IV performanc... 阅读全帖 |
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w******e
发帖数: 1187 | 8 In the biochemical arena, when a reactive agent forms a covalent bond with,
for example, an enzyme target, the assay readout is representative of
chemical reaction kinetics, not enzyme inhibition kinetics.
could anyone pls kindly give me some explanation on the above sentence? thx |
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r********r
发帖数: 352 | 9 在retail肯定用不上antibiotics dosing。
其实在医院大多数时候也不做first dose kinetics。都是根据体重，GFR估算一个dose
and dosing interval。然后隔段时间测一个trough，再adjust dosing，简单得很。
只有在NICU需要绝对individualize dosing。需要做kinetics. |
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r********r
发帖数: 352 | 10 在retail肯定用不上antibiotics dosing。
其实在医院大多数时候也不做first dose kinetics。都是根据体重，GFR估算一个dose
and dosing interval。然后隔段时间测一个trough，再adjust dosing，简单得很。
只有在NICU需要绝对individualize dosing。需要做kinetics. |
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l******d
发帖数: 287 | 11 在1903年，有一个叫 Olinto De Pretto 的意大利物理学家第一次提出质能公式，不过
他的公式推导过程并不严格，以至于不被后人承认。
爱因斯坦正是以清晰的物理思想推导出洛伦茨变换和质能公式而著名于世，有意思的是
这两个发现都不是爱因斯坦原创的。
Olinto De Pretto
From Wikipedia, the free encyclopedia
Olinto De Pretto (1857–1921) was an Italian industrialist and physicist
from Schio, Vicenza.
In 1903 De Pretto published a paper entitled "Hypothesis of Aether in the
Life of the Universe", in which he proposed (similar to Samuel Tolver
Preston in 1875) that matter moving at the speed of light would have kinetic
e... 阅读全帖 |
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l***y
发帖数: 1166 | 12 我这里正好有本高中英文教材，里面是这样说的：
1. gases are made up of tiny particles, freely moving in random directions
at high speeds.
2.gas particles make elastic collisions with each other and the walls of
their container. gas particles are moving with an average kinetic energy
that is proportional to the temperature of the gas.
3.the collisions between gas particles reate tiny forces on the walls of the
container and this creates pressure.
4.the gas lwas five the relationshiop between the pressure, temperature an... 阅读全帖 |
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发帖数: 1 | 13 Phys. Rev. E 93, 066103 (2016) – Published 29 June
2016
In this Comment we point out some shortcomings in two
papers [N. Laskin, Phys. Rev. E 62, 3135 (2000); N.
Laskin, Phys. Rev. E 66, 056108 (2002)]. We prove
that the fractional uncertainty relation does not
hold generally. The probability continuity equation
in fractional quantum mechanics has a missing source
term, which leads to particle teleportation, i.e., a
particle can teleport from a place to another. Since
the relativistic kinetic en... 阅读全帖 |
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r*f
发帖数: 731 | 14 还有一个，再帮帮我吧
write the expression for the kinetic energy of a fluid
flow occupying a volume V by a surface S. If the flow is
irrotational and incompressible prove that the kinetic
energy is given by
{\rho}/2*{\intergral_s{\phi*{d{\phi}/dn}dA}
where \rho is density, \phi is the velocity potential.
d in d{\phi}/dn means partial differential.
//bow again |
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p*********e
发帖数: 32207 | 15 question:
What's the rough relationship between non-reversible deformation and size?
also, that's not a problem a smaller structure has a lower capability
in absorbing kinetic energy. What we are comparing is small vs large.
As long as the drop in crash performance is slower than that of the kinetic
energy with a smaller structure, we have a winner. That's why I am asking
the above question.
Plus, as i recall from the crash test video, the collision between the car
and the barrier is not complet |
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w*******y
发帖数: 60932 | 16 Newegg has the Skechers Shape-Ups Women's 'Kinetix Response' Toning Athletic
Sneaker for $45 free shipping.
Lowest price online for these. Many "normal" sizes available
Link:
http://www.newegg.com/Product/Product.aspx?Item=9SIA04M07B7094&
Description
Brand: Sketchers. Style Name: Kinetix Response. Style Number: 12340. Kinetic
Wedge Technology. An ultra-soft kinetic wedge of polyurethane extends from
heel to toe, giving each stride a gradual transition. The softer, lower
layer provides superior c... 阅读全帖 |
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m*********k
发帖数: 10521 | 17 本次统计截止时间为：2013-07-12 02:00:00 （美东时间）
成功奖励 20 伪币的用户: aangel7788, archers, Bama92, bigcatfish, bmedcl,
Boehner, childheart, cnautofan, crystalt, dob, dora123, DRDW, echomao,
Eden101, excalibur, floatingmoon, Gogo2008, icq9999, IcyLi, Irrational,
kekexixi, kickok, kinetics, klarke, ledona, LeiWritings, lesabre, liuxd,
lolocandy, manwu, MITX, nelson0235, NewNote, nowwhat2012, nudu, pathdream,
qianluludna, quixotic, shincha, syuan, thjlll, Thoreau, wababy, wwwjobs,
xwmz, YH2009
奖励版面:(Animals)20伪币成功
奖... 阅读全帖 |
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c****s
发帖数: 5892 | 18 奥运為全球注目大型赛事，对主办城市的社会、经济、以及环境影响也十分耐人寻味。為了纪录奥运歷程，提供其他主办城做参考，以协助未来赛事规画和演进，卑诗大学（UBC）日前成立「运动与持续性中心」（The Centre for Sport and Sustainability），专业分析与研討相关议题。
据世界日报消息，卑诗大学人类运动学系（Human Kinetics）早已著手研究相关题目，中心主任史巴克（Robert Sparks）指出，各界对於国际大型赛事与社区间的关係，兴趣与关注越来越高，相关资料也越来越热门，因此特地成立中心，欢迎外界交流。
国际奥会（IOC）对「运动与持续性中心」的设立也表示讚许，认為温哥华有系统的归纳冬奥资讯，不但与未来主办城分享经验与遗產，也积极研究奥运对当地社会、经济、和环境影响，為十分宝贵的资讯。
「运动与持续性中心」也协办第三届「国际运动商业討论会」，与国际专业人士探討2010冬奥的各项议题。 |
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d*b
发帖数: 21830 | 19 自己去pubmed查吧，比如查estradiol kinetics。要多少有多少。这种题材都被生物千
佬们做烂了。奥运会查的steriod不就是一种激素？对了，土鳖还是steriod的世界头号大国。估计这奶粉肯定不会是低技术的 |
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s******6
发帖数: 748 | 21 0.04mm的精度你怎么没看见？Kinetic估计4mm的精度都没有，就是个玩具
其实本来没什么，微软这个也算是有创新的，只是被你这么肉麻的吹捧让人感到恶心 |
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p******u
发帖数: 14642 | 22 可以？怎么玩？我老可是苏联老的玩家，用摇杆720度随便转的，拿kinetic怎么玩？ |
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w*********m
发帖数: 4740 | 24 this is like the kinet game |
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h******i
发帖数: 661 | 25 你们学校ap能发这么多paper?
1989
Cosmological implications of quasar-galaxy associations, L.Z.Fang, Y.Q.Chu
and X.F. Zhu, Mod. Phys. Lett., 4, 887.
Geometrical optics in an inhomogeneous universe, L.Z.Fang and X.P.Wu,
Chinese Phys. Lett., 6, 233.
Quasar clustering and its cosmological implication, L.Z.Fang, Inter. J. Mod.
Phys. A4, 3477.
L'Osservatorio astronomico di Pechino: la sua storia, il presente, L.Z.Fang,
Scienza e Tecnica, Annuario della EST 88/89 404.
Overview on the frontier of high energy astr... 阅读全帖 |
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b***y
发帖数: 14281 | 26 No. The search include his early works up to 1978. Here is the same list
sorted by year.
1) The Influence of Gravitation on the Vacuum State.
By Li-Zhi Fang.
Acta Phys. Sinica 27 ( 1978) 181-18.
2) THE STRUCTURE AND STABILITY OF THE ABNORMAL NEUTRON STAR.
By Li-Zhi Fang, Qin-Yue Qu, Zhen-Ru Wang, Tan Lu, Liao-Fu Luo.
Sci.Sin.22:187-198,1979.
3) Some Recent Developments in Astrophysics. (Talk).
By Li-Zhi Fang, A. Qadir, R. Ruffini.
In *Nathiagali 1980, Proceedings, Physics and Contemporary Needs... 阅读全帖 |
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g**1
发帖数: 10330 | 27 Aegis Missile Defense System Intercepts Target in Test
American Forces Press Service
WASHINGTON, Feb. 13, 2013 – The Missile Defense Agency and sailors aboard
the USS Lake Erie conducted a successful flight test of the Aegis Ballistic
Missile Defense system today, resulting in the intercept of a medium-range
ballistic missile target over the Pacific Ocean by a Standard Missile-3
Block IA guided missile.
At 4:10 a.m. EST, a unitary medium-range ballistic missile target was
launched from the Pacif... 阅读全帖 |
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g**1
发帖数: 10330 | 28 标准3在大气层外拦截。
The SM-3 maneuvered to a point in space and released its kinetic
warhead. The warhead acquired the target re-entry vehicle, diverted into its
path, and, using only the force of a direct impact, engaged and destroyed
the target. |
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h***i
发帖数: 89031 | 29 你说说什么是kinetics
什么是dynamics |
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b********n
发帖数: 38600 | 30 kinetics 运动学
dynamics 动力学 |
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g**1
发帖数: 10330 | 31 Kinetic Kill Vehicle (KKV) |
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c***T
发帖数: 4990 | 32 看来你也不确定张说的一定错了嘛。
我不过嘲笑一下急急忙忙跳出来说张说了个-700度以上的人。
你说你悲愤个啥子？
再说富温度其实也是可以有的。而且比任何正温度都要hot。
还是per wiki
In physics, certain systems can achieve negative temperature; that is, their
thermodynamic temperature can be expressed as a negative quantity on the
Kelvin or Rankine scales. In colloquial usage, "negative temperature" may
refer to temperatures that are expressed as negative numbers on the more
familiar Celsius or Fahrenheit scales, with values that are colder than the
zero points of those scales bu... 阅读全帖 |
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x*****8
发帖数: 10683 | 33 We eat good food: to get information (negative entropy).
We get rid of waste: to further reduce entropy.
low entropy = high order = good smell
high entropy = disorder = bad odor
BTW, my PhD in biochemistry was about thermodynamics/kinetics. |
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n*********a
发帖数: 1956 | 34 New York Times
A.O.Scott的comment:
"You can admire what he does without really enjoying it, and two hours and
46 minutes of pulverized architecture is a lot to endure. But in every
Michael Bay movie there are at least a few moments of inspired, kinetic
absurdity. Late in “Age of Extinction,” a giant spaceship hovering over
Hong Kong, equipped with some kind of magnet, sucks up a lot of vehicles —
buses, trucks, fishing boats, ferries, whatever — and drops them onto the
city below. I could not tel... 阅读全帖 |
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S******8
发帖数: 24594 | 35 老方到美国后发的文章列表，你自己看吧：
1990
174. Biased clustering in a universe with hot dark matter and a cosmic
string, L.Z.Fang, S.P.Xiang and L.Yan, Astr. & Astrophys. 233, 1.
175. Periodicity of redshift distribution in a T-3 universe, L.Z.Fang, Astr.
& Astrophys. 239, 24.
176. An upper limit to quasar's peculiar velocity, L.Z.Fang, Y.Q.Chu, X.F.
Zhu and L.F. Wang, Inter. J. Mod. Phys., 5, 2993.
177. Quasar pair and quasar's peculiar velocity, L.Z.Fang, Developments in
general relativity, astrophysics and qu... 阅读全帖 |
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l******t
发帖数: 55733 | 36
尼玛诺贝尔这么好拿。来一段wiki：
Whenever energy is added to a system, the system gains mass:[citation needed]
A spring's mass increases whenever it is put into compression or tension.
Its added mass arises from the added potential energy stored within it,
which is bound in the stretched chemical (electron) bonds linking the atoms
within the spring.
Raising the temperature of an object (increasing its heat energy) increases
its mass. For example, consider the world's primary mass standard for the
kilogram, m... 阅读全帖 |
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X******i
发帖数: 1384 | 37 我爱我的老公，他也很爱我，不用大家操心我的私生活。作为博士后，我工作很忙，做
实验，写文章，看文章，写proposal，代课，判作业。一般大家看见我发帖了，那八成
是我在做kinetics的实验，就像昨晚。 |
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X******i
发帖数: 1384 | 38 确实沟通困难，但是作为连夜做kinetics实验之外的调剂，也是不错。 |
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x********e
发帖数: 35261 | 39 你不懂就少说几句行吗
溶解是破坏原有的化学键，形成新的化学键。从kinetics的角度看溶解度取决于破坏旧
键形成新键所需的能量变化。
扩散是布朗运动。 |
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f*******y
发帖数: 8358 | 40 我觉得你google thermodynamics 和 kinetics就知道概念了啊。 |
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D**s
发帖数: 6361 | 41 m/newstext.aspx?nn=13940911000634
根据华盛顿自由灯塔报报导，俄罗斯在11月18日成功进行首次反卫星导弹试验。俄罗斯
的直升式反卫星导弹为Nudol。这是三次试验中第一次成功。
俄罗斯成为继中国后第二个拥有战略太空武器的国家。中国在10月份进行了动能3号直
升式反卫星导弹试验。
有人称，在太空武器竞赛中是不对称的。数十年来，国会一直阻止在空间部署甚至开发
陆基反卫星武器，但俄罗斯人没有这种限制，并且当他们想违反军备控制条约时，他们
会有足够的机会这么做。
TEHRAN (FNA)- Moscow carried out the first successful flight test of its new
anti-satellite missile last month, becoming just the second nation to arm
its military with space warfare weapons.
Russia's direct ascent anti-satellite missile, known as Nudol,... 阅读全帖 |
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n*******4
发帖数: 2285 | 42 说东风有误差也是误差几百米那种。可你根本无法预测哪颗能中，哪颗不能中， 都得
发SM拦截，不然就来不及了，df-21九分钟就飞抵目标，SM3反应时间只有2-3分钟， 因
为它自己加速，飞到大气层外需要时间。
看看wiki上的评价，估计SM3,SM6,SM2拦截东风单发成功率远低于50%！能到10%就不错
。即便50%， 也要7颗拦截弹才能达到99%拦截成功概率。
https://en.wikipedia.org/wiki/DF-21
United States Naval Institute in 2009 stated that such a warhead would be
large enough to destroy an aircraft carrier in one hit and that there was "
currently ... no defense against it" if it worked as theorized. The United
States Navy has responded by switching its focus from a ... 阅读全帖 |
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k********k
发帖数: 5617 | 44 http://news. .net/immigration/2017/04/06/big5/1808258.html
100個單詞測出你的英文水平 快來測一測
www.creaders.net | 2017-04-06 09:33:06
這里是美國 | 0條評論 | 查看/發表評論
美國Heritage精心編輯了100個單詞。
他們認為這100個詞 能評測出美國高中畢業生的語言水平。
"我們選擇的單詞，如果你知道如何正確哂茫屈N你將在語言方面沒有問題。"
——《Heritage》主編Steven Kleinedler
那麼，你也來測一測吧!看這100個單詞，你認識幾個 ?
檢驗美國高中生英文水平的100個單詞:
abjure
abrogate
abstemious
acumen
antebellum
auspicious
belie
bellicose
bowdlerize
chicanery
chromosome
churlish
circumlocution
circumnavigate
deciduous
deleterious
diffident
enervate
enf... 阅读全帖 |
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k********k
发帖数: 5617 | 45 http://news. .net/immigration/2017/04/06/big5/1808258.html
100個單詞測出你的英文水平 快來測一測
www.creaders.net | 2017-04-06 09:33:06 這里是美國 | 0條評論 | 查看/發表評論
美國Heritage精心編輯了100個單詞。
他們認為這100個詞, 能評測出美國高中畢業生的語言水平。
"我們選擇的單詞，如果你知道如何正確運用，那麼你將在語言方面沒有問題。"
——《Heritage》主編Steven Kleinedler
那麼，你也來測一測吧!看這100個單詞，你認識幾個 ?
檢驗美國高中生英文水平的100個單詞:
中英對照參考
abjure 發誓放棄
abrogate 廢除
abstemious 節省的 有節制的
acumen 聰明/敏銳
antebellum 戰爭前的
auspicious 吉利的
belie 掩飾/違背/使失望
bellicose 好戰的
bowdlerize 刪除文句 刪改
chicanery 欺詐/狡辯
chromosome 染色體
churlish 無... 阅读全帖 |
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A*******l
发帖数: 1083 | 47 就是逗逼的意思，老将们纷纷高潮了，逗逼就结束了。 |
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b********n
发帖数: 38600 | 48 I'm sure the South Koreans are really excited about President Trump's saber
rattling. The entire peninsula is being held hostage by two egos. |
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A*******l
发帖数: 1083 | 49 Incorrect, it's just staging shows for the 'juice'.
saber |
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p***n
发帖数: 17190 | 50 應該升級成 dynamic 吧....
Sudden |
|
