i*********5
发帖数: 19210 | 1 有车友PM我如何练习爬坡能力，我认为唯有多练才能提高。放狗搜了一会儿，觉得这篇
文章对hill repeats写的还不错，share出来供大家参考。
Cycling: How Do I Become Better?
Part 2: Increasing Strength and Force Ability
By Coach Al Lyman, CSCS
http://www.angelride.org/documents/article_cycling2.pdf
Hill Repeats:
The most effective Hill Repeat session for most serious recreational
cyclists is a session that involves 3 to 5 seated repetitions of repeats on
a moderately steep hill that are 2 to 3 minutes in duration. Remember to
choose a hill that is very low tra... 阅读全帖 |
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k**n
发帖数: 482 | 2 you won't cut too much fat by swimming, the water is cold and in that
situation your body is going to store fat to keep the body temperature, it
is good for the smooth curvature of the body though, also you have to speed
up, it matters how fast you swim, try to push for a minute a lap, 2 minutes
a lap won't help you much |
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O*******e
发帖数: 6055 | 3 Mechanically speaking, there have been a number of significant improvements
to the P226. Original contract models were supplied with phosphate or nickel
-plated internal parts. These early guns featured carbon steel slides with
internal extractors manufactured in Germany and finished in a black
phosphate. Once production of the P226 shifted from Germany to our American
shores, the manufacture of all P226 slides was machined from stainless steel
and featured an external extractor. The aluminum fr... 阅读全帖 |
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j***y
发帖数: 2074 | 4 http://www.cchere.com/ccbbs/Announce/announce.asp?BoardID=105&I
作者：萝卜酒
两马相交，都使硬兵器，硬碰硬， 谁重谁占便宜。《水浒》霹雳火秦明使狼牙棒，急先
锋索超使开山斧，都是这个思路。几十斤的狼牙棒、开山斧借着马力，横扫过来，万不可
硬架。硬架的话，铁矛都要打弯，两臂就得骨折，而他那边挥棒时，手是空握着的， 一
点事都没有。对付这种敌手， 大锤最有用。 锤比棒重， 挥动起来只要有点速度， 冲量
就超过棒了。锤棒相碰， 冲量两相抵消， 大家的手都是空握着的，都没伤着。 锤比棒
短， 回手变招快，趁着敌人收棒不急， 一锤就砸下去。 金兵爱使狼牙棒， 碰上岳云的
金锤就全玩完了。 使重兵器的关键就是要把兵器运出速度来，手得空握着，以防反震。
这就象打网球时握紧拍子单手硬接来球会镇伤膀子一样， 松松地握拍， 拍子动起来就不
怕了。要把百斤的金锤在短时间里运起来，没点天生的神力办不到。膀臂上的力太小是没
用的， 只有靠腰， 腰力到手，才运得动重兵器。 内家功夫讲巧力，四两拨千斤，但真
要拼力气，使大锤，照样不含糊。 一切全因腰壮... 阅读全帖 |
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b*******n
发帖数: 5065 | 5 快，重是一阶测度
旋转化解后发先至，是二阶，加速度。
混元一体，是三阶，curvature, 三维变化。
我回国了，以后有机会拜访更多高手。
有人自作多情，笑谈我的网络名，也不看看谁的注册时间久。
顺便说一下，我还是看好方便，这个月末有比赛，会好好观看。 |
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p*****o
发帖数: 1285 | 6 多谢。照片看上去平平胖胖满合适，但看说明里说是"high asymmetric curvature, 估
计大脚趾会抗议。Gym里似乎没看到这款，周日找个地方试试去。 |
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p*****o
发帖数: 1285 | 7 我可能比你开始的还晚，就买入门的鞋。看到这双说“low asymmetric curvature”，
至少大脚趾会舒服一些。再问下，你的脚也偏宽偏平么？ |
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p**f
发帖数: 2610 | 8 我今天在书上看到一个关于过度运动的讨论..
"This brings up a broader issue important to our era of lookin' good.
Obviously, if you don't exercise at all, it is not
good for you. Exercise improves your health. And a lot of exercise
improves your health a lot. But that doesn't mean
that insanely large amounts of exercise are insanely good for your body.
At some point, too much begins to damage
various physiological systems. Everything in physiology follows the rule
that too much can be as bad as too little.
There are ... 阅读全帖 |
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Y**s
发帖数: 1632 | 9 Carving is actually not all that difficult to learn (note: knowing how to
do it and able to execute it perfectly are 2 completely different things :))
Unlike a normal parallel turn, you do not want to have your center of
gravity to be too forward -- you want to maintain a neutral body position so
you can more easily shift body weight from one foot to another. Carving is
letting your SKI's natural bent curvature to do the turn, and not actively
turning with your feet. Really the keys are:
1) k |
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d*********e
发帖数: 3835 | 10 you need to improve your techniques 不是一星半点 … the design/curvature is
much less tolerant, and yes it may skid a bit more than all mountain/slalom
(d'uh…) but it is still doable for average joe to leave two nice
recognizable tracks. |
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t*******e
发帖数: 216 | 11 it's a fair point.
我想弧度以及弧长同时来控制，
脚下的压力我认为如果在groom过的蓝道上，并且纯carving条件下，应该不会对速度有
很大的控制，因为没有脚下的阻力。
80mph sounds OK. 纯carving，groomed, 应该达到风阻与重力分量平衡的结果。
f = c*v*v = mg*sin(theta), where c is the resistance coeff, theta is the
effective downhill angle (function of curve length, curvature and slope
angle).
风阻系数c与滑雪者的身上衣着、身型以及滑雪姿势有关。所以纯carving平衡速度可以
通过衣着，高低姿势，回转弧度以及弧长来控制。
just for fun, 如果衣着crazy，人其实可以飞起来，那就是遵循贝努利方程了。
如有错误，欢迎指正 |
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L*********n
发帖数: 185 | 12
Honestly, if everything he said were from his Major coach, something is not
right. I really doubt his credentials based on what he described, sounds
like an old school technique, focused on neutral/close stance forehand,
volley and serve.
1. His boy is right-handed and w/modern techniques, his shoes wear-out
doesn't make any sense. If his boy plays open-stance inside out forehand
dominately, left shoes should wear out faster than right's. Black you can
confirm w/atp players or coaches you ... 阅读全帖 |
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M******0
发帖数: 1280 | 13 谢谢黑岛。我也觉得１５是粗了点。He can hit the high ball (above his waist)
with his full strength and spin.The ball goes over the net with little
curvature, and drops inside the court and bounces very fast forward.我也觉得
a synthetic >=16 will give even more spin and will keep the ball inside the
court a little easier.
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C******s
发帖数: 270 | 14 来自主题: ClassicalMusic版 - 恰空 给你篇文看
On the Marionette Theatre
by Heinrich von Kleist
Translated by Idris Parry
One evening in the winter of 1801 I met an old friend in a public park. He
had recently been appointed principal dancer at the local theatre and was
enjoying immense popularity with the audiences. I told him I had been
surprised to see him more than once at the marionette theatre which had been
put up in the market-place to entertain the public with dramatic burlesques
interspersed with song and dance. He assured me... 阅读全帖 |
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b*s
发帖数: 82482 | 15 War hammers were developed as a consequence of the ever more prevalent
surface-hardened steel surfacing of wrought iron armours of the late
medieval battlefields during the fourteenth and fifteenth centuries. The
surface of the armour was now as hard as the edge of a blade, so a blade
tended to ricochet. Swords, or the blade of a battleaxe, were likely only to
give a glancing blow, losing much of the impact, especially on the high
curvature of the helmet. The war hammer could deliver the full fo... 阅读全帖 |
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p*******y
发帖数: 133 | 16 This book summarized the history of development in modern physics.
Newton's gravity explained attraction between objects, and therefore why
apples fall down to the ground and why the earth orbits the sun.
Einstein's special theory of relativity explained that time and length are
not as absolute as everyday experience would suggest: Speed of light is
constant, moving clocks run slower leading to the twin paradox, and moving
objects are shorter. Another consequence of special relativity is the mos... 阅读全帖 |
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c********y
发帖数: 30813 | 17 photozone连ZF21都能测的和16－35L一样。
怀疑它是故意的，还是转接环有问题。
ZF25的field curvature早都不是新闻了。要不也不会二代里只有这个头要重新设计 |
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l***a
发帖数: 12410 | 18 this almost looks the same as the LG prada I used 3 years ago. I still
prefer to have some curvature |
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m****7
发帖数: 14685 | 19 weakness includes but not limited to: flare (early version), vignette,
corner softness, CA...
with 24-70 those listed above are gone. but 24-70's center is soso and
field of curvature is a PIA as for 24mm. |
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S*M
发帖数: 10832 | 20 interesting
我一直感觉我的85/1.8有field curvature
没想到85L上被证实了
所以拍全身还是135L好啊
像场更平
许弥散圆直
曲比较也能看
进一步完善， |
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m****7
发帖数: 14685 | 21 最靠谱的说法：
spherical aberration - near the center of the lens elements, the curvature
is relatively low and the aberration between ideal and actual is pretty
small. When you stop down, the lens only sees through the well-corrected
center so you have "correct" focus. Near the edges (included in the wide
open image), spherical aberration piles up and can cause a shift in the
plane of best focus between the ideal (similar to where it would be at say
f8) and actual. |
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x5
发帖数: 27871 | 22 ☆─────────────────────────────────────☆
mtime (苏米) 于 (Wed Jul 13 09:46:49 2011, 美东) 提到:
哪位两支都用过的来说说，各自的优缺点？推荐哪个？1.2比1.4大的事儿就别再提了
☆─────────────────────────────────────☆
GlennGould (WSN口算PDE) 于 (Wed Jul 13 09:47:21 2011, 美东) 提到:
85L II
☆─────────────────────────────────────☆
xuaner223 (基地猫办公室特别行动队队长) 于 (Wed Jul 13 09:47:33 2011, 美东) 提到:
85LII
af mf
☆─────────────────────────────────────☆
XAU (XAU) 于 (Wed Jul 13 09:50:36 2011, 美东) 提到:
85/1.4是ZE里的狗头啊
☆───────────────────────────... 阅读全帖 |
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d*****0
发帖数: 68029 | 24 好像有field curvature，据说加上附加镜以后边角就NB无比了。 |
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d*****0
发帖数: 68029 | 25 不考虑跑焦光学上尼康第一。canon有field curvature. |
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b*******t
发帖数: 33714 | 27 you think too much
meant orientation of curvature
be |
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d*****0
发帖数: 68029 | 28 他是用中心点对焦的，应该是镜头的field curvature |
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x****y
发帖数: 1853 | 30 highly doubt that. Different materials other than silicon, different layout
of metal interconnection to increase the effective sensing area, different
3D structure of the photo sites, and not to mention the curvature of the
sensor itself. |
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d******d
发帖数: 2210 | 31 metal interconnection layout 不会有影响。其它你提到的改变都是颠覆性的。
硅工艺还会保持一段时间
：highly doubt that. Different materials other than silicon, different
layout of metal interconnection to increase the effective sensing area,
different
：3D structure of the photo sites, and not to mention the curvature of the |
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l*x
发帖数: 396 | 32 结论是传统技术已经快到头了。即使改变材料和photo sites结构，也不解决主要噪音
来源 - 光子的统计涨落。你说的方案，只不过是提高一点效率榨出最后一滴水分。
以后感光器的进步需要的是革命性技术。
highly doubt that. Different materials other than silicon, different layout
of metal interconnection to increase the effective sensing area, different
3D structure of the photo sites, and not to mention the curvature of the
sensor itself. |
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p**o
发帖数: 3409 | 33 看来28/2.8这颗最小的头大概有重大改进
The Elmarit-M 28 mm f/2.8 ASPH. is the most compact lens in the entire
portfolio of Leica M-Lenses. Due to its compact size and low weight, this
lens is a particular favourite of street and reportage photographers.
In comparison with the earlier model, the new generation lens offers
significantly reduced image field curvature, which brings considerably
improved imaging performance with high resolution and extremely brilliant
resolution of details.
The Elmarit-M 28 mm f/2.8 ... 阅读全帖 |
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g****g
发帖数: 1828 | 34 In probability theory, the normal (or Gaussian) distribution, is a
continuous probability distribution that is often used as a first
approximation to describe real-valued random variables that tend to cluster
around a single mean value. The graph of the associated probability density
function is “bell”-shaped, and is known as the Gaussian function or bell
curve:[nb 1]
f(x) = \tfrac{1}{\sqrt{2\pi\sigma^2}}\; e^{ -\frac{(x-\mu)^2}{2\sigma^2}
},
where parameter μ is the mean (location of the pe... 阅读全帖 |
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L***6
发帖数: 8307 | 35 GPS卫星的时间修正，好像是广义相对论解释的，不是速度，而是卫星所在处的引力场
相比地面微弱,引力场弱的地方时间比较慢。地球这种高质量行星，它的质量和引力场
会引起比较明显的4纬时空的curvature，空间和时间不可分，地球周围的空间被地球的
质量扭曲，时间也一样扭曲，具体量化细节参见梨曼几何/广相。 |
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k****e
发帖数: 4262 | 36 The horn doesn't bend itself; it bends because the spacetime around the goat
is not flat -- the spacetime bends so much that the horn has to bend
according to the spacetime's curvature. |
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H******7
发帖数: 34403 | 37 The device is 2x2x4 meters in size. It is cylindrical shaped. It has a
vacuum inside with high magnetic fields, made using electromagnets.
Uncharged deuterium gas is injected. It is heated using radio waves, in much
the same way a microwave heats food. When the gas temperature reaches over
16 electron-volts, the gas ionizes into ions and electrons. This plasma
exerts a pressure on the surrounding magnetic fields. This plasma pressure
is counterbalanced by the magnetic field pressure in a beta ra... 阅读全帖 |
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c*****t
发帖数: 198 | 38 Q Rev Biophys. 2010 Aug 9;:1-75
Rate theories for biologists.
Huan-Xiang Zhou
Q Rev Biophys. 2010 Feb ;43 (1):65-158 20667175
Structures of membrane proteins.
Kutti R Vinothkumar, Richard Henderson
MRC Laboratory of Molecular Biology, Cambridge, UK.
Q Rev Biophys. 2010 May 18;:1-41 20478077
DNA curvature and flexibility in vitro and in vivo.
Justin P Peters, L James Maher
Department of Biochemistry and Molecular Biology, Mayo Clinic College of
Medicine, Rochester, MN, USA.
Quarterly Reviews of |
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w********h
发帖数: 12367 | 39 碰撞处蛋壳较薄或者radius of curvature较大的容易破。。。 |
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L*D
发帖数: 3966 | 40 【 以下文字转载自 NextGeneration 讨论区 】
发信人: ShoppingCat (爱Shopping的猫), 信区: NextGeneration
标 题: 关于坐月子的一点看法
发信站: BBS 未名空间站 (Sun Jul 31 13:54:02 2011, 美东)
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 pr... 阅读全帖 |
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b*******1
发帖数: 94 | 41 国内做设计的用到pcacolumn吗，或者有什么类似的软件吗？
还有国内设计要用到moment curvature analysis 吗，一般用什么软件做。
谢谢 |
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j***h
发帖数: 4412 | 42
Did you never use PKPM in your undergraduate course works? In addition, the
Chinese code for concrete structure design is not ACI 318, it is 《混凝土结
构设计规范》GB50010-2002.
Usually they don't care what envision moment curvature analysis can provide
for them. All they care is the section capacity. Some old guys who got
their BS in 1950s or 1960s, e.g., a senior member of China Engineering
Academy,believe in the funny results of FEM analysis, not the innovation or
conceptual design of structural engi... 阅读全帖 |
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b*******1
发帖数: 94 | 43 这里也有一个可以提供一些免费的软件做moment curvature 分析，混凝土柱设计以及
预应力桩设计的。www.structurexpress.com |
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y********g
发帖数: 81 | 44 1.Current and load cap. Its current is a
function of length, width, bias, etc.
2. 45nm, 32nm is half pitch dimension. This
is not transistor physical gate length nor
effect channel length. Refer to device
physics for detail.
3. 1/rate? how do you define resolution?
4. NMOS is stronger than PMOS in term of
larger current under the same condition.
NMOS conducts electron current whereas PMOS
conducts hole current. Whichever carrier it
is, current is proportional to mobility.
mobility is inverse pro... 阅读全帖 |
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c*****e
发帖数: 238 | 45 I think that's related to coarsening..
Usually the region with high concentration also has small curvature, and thus
the chemical potential of the boundaries is lower. |
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D********g
发帖数: 533 | 46 1是做Polymer Nanocomposites的 我觉得她如果去百老汇唱女高音也应该没问题
挺energetic的，感兴趣的一个观点是polymer nanocomposite在一定程度上能等同于有
curvature的polymer thin film. |
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S****t
发帖数: 1186 | 47 不知道怎么清除的表达:-)
我想做的一些工作包括：
根据曲面方程(z = f(x,y))推导出一些曲面的signature,
比如说曲面上任何一点的坡度，通过该点的任意平面和曲面
方程z=f(x,y)相交的曲线的曲率(curvature)，等等。
有没有比较好的微分几何教材或专著含盖了这些内容，谢谢。 |
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x******i
发帖数: 3022 | 48
the surface given by (x,y,f(x,y)) has positive Gaussian curvature. |
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