W*****d
发帖数: 4196 | 1 Dr. Susan Xiao-Ping Su
President of Tri-Valley University
Tri-Valley University TVU
E-mail: s*[email protected], s***[email protected]
EDUCATION
Ph .D. Department of Mechanical Engineering, University of California at
Berkeley, 2001.
Major: Design; Minor I: Microscale Heat Transfer; Minor II: Integrated
Circuit Technology.
Dissertation: Compliant Microleverage Mechanism Design for MEMS Application
Dissertation Advisors: Prof. Alice M. Agogino; Prof. Tsu-Jae King, Prof.
Dennise K. Lieu
M. S... 阅读全帖 |
|
a***l
发帖数: 248 | 2 Agree.
The materials strengths we usually refer to are under uniaxial tensile
loading.
屈服强度 Yield Strength is the on-set of the strain-hardening, defined by
permanent deformation of strain = 0.2%.
抗拉强度 Ultimate Strength is the stress when stretch to failure. |
|
g********d
发帖数: 19244 | 3 ☆─────────────────────────────────────☆
felixcat (felixcat) 于 (Thu Mar 7 17:01:19 2013, 美东) 提到:
发现有一些人存在误解：认为碰撞测试成绩能代表有没有用高强度/超高强度/极高强度
钢材来造车身，有没有“不计成本”来给好货给消费者。从而一旦发现碰撞测试看上去
不好，就觉得车厂没有用好钢材省成本。
事实上并非这样，我下面列举一些具体的车型的车体结构，大家就能发现一些碰撞测试
成绩很好的车子，事实上并没有用很高强度的材料；而一些碰撞测试让人觉得成绩一般
的车子，事实上却是用了很不错的钢材。造成这种直觉上“对不上号”的原因在于，碰
撞测试成绩不完全取决于钢材硬度，它还跟车体形状、能量传递的设计意图有关。
首先看Audi A4。在small overlap碰撞测试成绩出来之后，这车子的结构强度在公众心
目中马上从天堂掉到了地狱。A柱拦腰截断，这不像话。
但是实际上A4车身框架用料极其足，车身结构有65%是强度超过300 MPa的高强度钢制造
；在这里面又有占全车身18%的材料是强度在500到1... 阅读全帖 |
|
|
d****o
发帖数: 32610 | 5 bacterial mineral excretion
也不是很好玩
http://jss.ecsdl.org/content/6/3/N3113.full
Sodium Tungstate and Sodium Molybdate Hollow Microspheres
Abstract
This study is to present sodium tungstate and sodium molybdate hollow
microspheres–microspheres with three length-to-diameter ratios of 1:1, 3:1,
and 10:1. They were excreted by two strains of aquaculture probiotic Gram-
negative bacterium, Shewanella sp. and Pandoraea sp. Their morphology is of
hollow spherical shape, which was captured via the scanni... 阅读全帖 |
|
|
|
|
n*****e
发帖数: 19 | 9 UTM是啥呀?Uniaxial Tension Machine? |
|
l****u
发帖数: 3449 | 10 The role of the background dielectric susceptibility in uniaxial
ferroelectrics
A. K. Tagantsev
Ferroelectrics, 1563-5112, Volume 69, Issue 1, 1986, Pages 321 – 323请发送
到 s************[email protected]
thanks! |
|
l****u
发帖数: 3449 | 11 【 以下文字转载自 Physics 讨论区 】
发信人: lotayu (罗大佑), 信区: Physics
标 题: paper help
发信站: BBS 未名空间站 (Tue Jun 2 12:20:26 2009)
The role of the background dielectric susceptibility in uniaxial
ferroelectrics
A. K. Tagantsev
Ferroelectrics, 1563-5112, Volume 69, Issue 1, 1986, Pages 321 – 323请发送
到 s************[email protected]
thanks! |
|
