t*******1
发帖数: 57 | 1 二手交易风险自负！请自行验证是否合法和一手卡！:
朋友从Belli官网买的，保证是正品。
我想卖的物品:
Belli Elasticity Belly Oil（共5瓶）
单张面值:
官网是$39/瓶，$69/2瓶
可接受价格(必须明码标价！):
5瓶一起要了，就一共$110包邮；如果单买，$25/瓶+实际邮费
可协商，买的越多优惠越多
物品新旧要求:
5瓶确实都是崭新的，一点也没用过。
邮寄方式要求:
默认USPS，如有要求，请提前告知
买卖双方谁承担邮寄损失(Required if not code only):
如果MM要求，可以加保险，但请自行承担保险费。
如果邮寄损失，可以协商解决。
付款方式说明:
我不知道什么是chase quickpay，也没有paypal,所以只能用BOA了。
其他补充说明:
代朋友处理Belli Elasticity Belly Oil，据朋友说是给怀孕的准妈妈用的，专门用在
怀孕的肚皮上的，可以减少妊娠纹的。
朋友本来是J2过来陪老公，准备生孩子的，后来国内有事情，她不得不回去一段时间，
不知道什么时候能再过来，就托我帮忙处理一下。走的时候很匆忙，没... 阅读全帖 |
|
t*******1
发帖数: 57 | 2 二手交易风险自负！请自行验证是否合法和一手卡！:
朋友从Belli官网买的，保证是正品。
我想卖的物品:
Belli Elasticity Belly Oil（共5瓶）
单张面值:
官网是$39/瓶，$69/2瓶
可接受价格(必须明码标价！):
5瓶一起要了，就一共$110包邮；如果单买，$25/瓶+实际邮费
可协商，买的越多优惠越多
物品新旧要求:
5瓶确实都是崭新的，一点也没用过。
邮寄方式要求:
默认USPS，如有要求，请提前告知
买卖双方谁承担邮寄损失(Required if not code only):
如果MM要求，可以加保险，但请自行承担保险费。
如果邮寄损失，可以协商解决。
付款方式说明:
我不知道什么是chase quickpay，也没有paypal,所以只能用BOA了。
其他补充说明:
代朋友处理Belli Elasticity Belly Oil，据朋友说是给怀孕的准妈妈用的，专门用在
怀孕的肚皮上的，可以减少妊娠纹的。
朋友本来是J2过来陪老公，准备生孩子的，后来国内有事情，她不得不回去一段时间，
不知道什么时候能再过来，就托我帮忙处理一下。走的时候很匆忙，没... 阅读全帖 |
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w****e
发帖数: 1013 | 3 I just started to learn economics, and am very confused about two concepts
(1) Marginal Rate of Substitution
(2) Elasticity of Substitution.
I am fine with the mathematical definitions of these two concepts and also
am ok with the geometric difference, but I can not appreciate them by
intuition. I know that Elasticity of Substitution is supposed to be
measuring the easiness/difficulty of inputs, say, for example, how easy it
is to replace labor with machine, but this example just sounds like wha |
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l****w
发帖数: 10 | 4 想请教一下这里的大牛们，
omega= call option elasticity =(dc/ds)*（s/c）随着 s 增加 递减的图是怎么得来的？
(dc/ds)*（s/c）>1 证明得非常明白，但是为什么随着 s 增加，call option elasticity=(dc/ds)*
（s/c） 递减，我看到 Mcdonald ,hull 只说啦intution,然后给拉numerical example.
但是为什么d[(dc/ds)*（s/c）]/ds <0, 我证明拉好久都没弄出来。这里的牛人多，我
想确认以下，是不是肯定不能证明，只能numerical 画图？如果能证明请大牛给我指点
一下吧。谢谢 |
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h*****u
发帖数: 204 | 5 什么情况下 Put Option Elasticity的绝对值可能小于1？
或者为什么Put Option Elasticity的绝对值可能小于1？ 谢谢 |
|
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w*******y
发帖数: 60932 | 7 TowncraftElastic-Back Corduroy Pants:
http://www.jcpenney.com/jcp/X6.aspx?GrpTyp=PRD&ItemID=1c6d3a5&s search.y=4&Ntt=Towncraft庐 Elastic-Back Corduroy Pants&SearchString=Towncraft庐 Elastic-Back Corduroy Pants&Ne=4 840 877 878 5 961 6 29 3 579 963 1014 1031 8 587 15 12 1011 598 11 506 10 23 585 969 596 1022 586 1007 879 968 1027 18 904 903 833 1545&hdnOnGo=true&NOffset=0&submit search.x=12&Nao=0&N=4294959029&SO=0&PSO=0&CmCatId=searchresults
$5 best price
Shipping is free to the store
|
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c****n
发帖数: 15245 | 8 Scunci Elastic Bands, 18 ct $2.99, sale price through 8/9
Buy 1, Receive $2.00 Up Reward through 8/9, Limit 2
Use $2.00/1 – Conair or Scunci Tool and Fashion Product, regular retail $3.
99 or more, Rite Aid Coupon (adperk.com)
Pay $0.99, Receive $2.00 Up Reward
Final Price: $1.01 Moneymaker |
|
N*****m
发帖数: 42603 | 9 你自己搞个server/cluster如果系统能auto-scale，资源elastic，那就是private clo
ud。问题是自己的private cloud如果用户量不大的话，要不浪费，要不会有瓶颈。 |
|
g*****g
发帖数: 34805 | 10 Not just elastic, high availability or so. You can easily have 2 regions, 6
zones in US with Amazon for availability. It's not possible to achieve that
unless you are Google, Facebook, M$ etc..
clo |
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T*****9
发帖数: 2484 | 11 用起来呢？
最近发现Elastic Search想move到第二个data center都没有什么好办法，只能rebuild
index |
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f**n
发帖数: 401 | 12 Standard textbook on price demand elasticity states that, for one single
commodity, demand d is a function of price p, s.t., d = d(p). If the
objective is to maximize revenue, the optimal price point p* is the point p
such that p*d(p) is maximized.
However, in reality even identical commodities are not sold at one universal
price. For example, TOYOTA CAMRY 2009 may have one MSRP (at least let us
assume so), but different dealers may offer you different discounts so that
the actual out-of-door pr |
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g****h
发帖数: 99 | 13 If the firm chooses optimal p to maximize p*d(p), it means you are talking
about a firm with some market power, say a monopolist. In that case, the
changing price elasticity of demand (Ed) is revealed in MR curve.
MR = P (1 + 1/ Ed)
Rewrite it, you can get optimal price as a function of Ed:
P = Ed* MC / (Ed + 1) |
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f**n
发帖数: 401 | 14 Many thank for the clarification.
In terms of monopoly, there are 5 or 6 major suppliers in the market with
some more fringe suppliers. Consumers perceive that there are non-price
differences among the competitors' products; producers have a degree of
control over price.
I think my initial confusion comes from my trying to combine elasticity and
price discrimination in one context. When we say "the firm sets price to
maximize profit", does it mean that you have to assume a single price first?
An |
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g****h
发帖数: 99 | 15 When we say "the firm sets price to maximize profit", it does not mean we
have to assume a single price first. The price elasticity of demand is
already known when you have demand curve functions. So firms are actually
maximize profit after knowing its Ed at any price level.
As for the demand curve, firms may face a straight line single demand, a
kinked demand curve, or multiple demand curves for different kinds of
consumers or different scenarios. If you want to study the influence of Ed
on pri |
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b******v
发帖数: 1493 | 16 在Incompressible Elasticity里，能量泛函有如下表达式
E(u,p) = \int_{\Omega} W(F)-p(detF-1)-f*u -\int_{\Gamma} g*u
做一阶变分，能够得到Euler-Lagrange方程
\int_{\Omega} [dW/dF-p d(detF)/dF]:grad(v)-fv -\int_{\Gamma} g*v = 0
\int_{\Omega} -q(detF-1) = 0
再做一次变分，能够得到Euler-Lagrange方程的线性化方程，
这是一个saddle point system
a(w, v) + b(p, v) = L1(v)
b(q, w) = L2(q)
其中a(w,v) = \int_{\Omega} [(d^2W/dF^2-p*d^2(detF)/dF^2)grad(w)]:grad(v)
而b(q,v) = \int_{\Omega}-q*d(detF)/dF:grad(v)
根据熟知的理论，上述saddle point system是well-posed的充要条件是
( |
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s******e
发帖数: 54 | 17 I was wondering if anyone had the solutions to the elasticity book written by
Barber. |
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c*****y
发帖数: 6 | 18 为什么温度升高，elastic modulus 减小? |
|
c*****y
发帖数: 6 | 19 如果软了，已经是plastic region了，没有elastic modulus 的概念了吧？ |
|
c*****y
发帖数: 6 | 20 如果软了，已经是plastic region了，没有elastic modulus 的概念了吧？ |
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x******a
发帖数: 6336 | 21 what is Put Option Elasticity?
thanks |
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q********g
发帖数: 10694 | 25 US-East (Northern Virginia) Region
Amazon EC2 running Linux/UNIX
$0.085 per Small Instance (m1.small) instance-hour (or partial hour)
$0.34 per Large Instance (m1.large) instance-hour (or partial hour)
$0.68 per Extra Large Instance (m1.xlarge) instance-hour (or partial hour)
$0.02 per Micro Instance (t1.micro) instance-hour (or partial hour)
$0.50 per High-Memory Extra Large Instance (m2.xlarge) instance-hour (or
partial hour)
$1.00 per High-Memory Double Extra Large Instance (m2.2xlarge) insta... 阅读全帖 |
|
w*******y
发帖数: 60932 | 26 *1 YEAR* AMAZON CLOUD FREE AKA AWS
Link:
http://aws.amazon.com/free/
AWS Free Usage Tier
To help new AWS customers get started in the cloud, AWS is introducing a new
free usage tier. Beginning November 1, new AWS customers will be able to
run a free Amazon EC2 Micro Instance for a year, while also leveraging a new
free usage tier for Amazon S3, Amazon Elastic Block Store, Amazon Elastic
Load Balancing, and AWS data transfer. AWSs free usage tier can be used for
anything you want to run in the cl... 阅读全帖 |
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q********g
发帖数: 10694 | 27 Sobereva
Department of Chemistry, University of Science and Technology Beijing,
Beijing 100083, China
前言：本文主要介绍过渡态、反应路径的计算方法，并讨论相关问题。由于这类算法极
多，可以互相组合，限于精力不可能面面俱到展开，所以只介绍常用，或者实用价值有
限但有启发性的方法。文中图片来自相关文献，做了一定修改。由于本文作为帖子发布
，文中无法插入复杂公式，故文中尽量将公式转化为文字描述并加以解释，这样必然不
如公式形式严谨，而且过于复杂的公式只能略过，但我想这样做的好处是更易把握方法
的梗概，有兴趣可以进一步阅读原文了解细节。对于Gaussian中可以实现的方法，文中
对其在Gaussian中的使用进行了一些讨论，希望能纠正一些网上流传的误区。虽然绝大
多数人不专门研究计算方法，其中很多方法也不会用到，但多了解一下对开阔思路是很
有好处的。
文中指的“反应”包括构象变化、异构化、单分子反应等任何涉及到过渡态的变化过程
。“反应物”与“产物”泛指这些过程的初态和末态。“优化”若未注明，... 阅读全帖 |
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j****u
发帖数: 1413 | 28 李巨：徜徉在量子材料世界
新闻原文与照片请见：http://www.ustcif.org/default.php/content/1464/
2012年10月10日，麻省理工学院（以下简称MIT）以其官方网站首页封面图片方式报道
中国科大90级少年班校友李巨教授的成就。 当地时间11日，中国科大校友新创基金会
致电李巨教授表示祝贺。李巨教授提及已得知“再战北马，捐赠海外交流”行动，“一
定要支持”。随即李巨教授立即在中国科大捐赠网（GIVING.USTC.EDU.CN）捐赠感谢母
校的教育。他还祝福母校“ I wish USTC great success in the campaign.”。
图为2012年10月10日，MIT网站首页今日聚焦以全页封面报道方式介绍李巨。
《徜徉在量子材料世界》介绍了李巨教授获得的成果。文章称，李巨从原子尺度设计出
的新材料，在未来新能源领域有着应用。李巨成功了设计了全球最小的电池。该文特别
介绍李巨从他在中国科学技术大学的大学生活，并介绍说：他在中国科大培养了对电子
工程与计算机科学的浓厚兴趣。这些兴趣引导了李巨教授使用材料的计算机仿真手段去
了解如... 阅读全帖 |
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c***d
发帖数: 996 | 29 先看个video:
http://www.youtube.com/watch?v=hEqQMLSXQlY
他主持的一个系统，replication策略我觉得和hdfs有重复， 我就问为什么不直接架在
hdfs上作。这位大哥大概是这么解释的：
hdfs的metadata management其实是single point of failure，确实可以用backup
namenode来改善，但这不是问题的根本。问题的根本是distributed storage的
replication information不应该用lookup 来解决，而应该用比较robust的hash
function。那会不会不elastic呢？ 确实有这个问题，这个问题的关键在于，系统本身
要有一个作elastic logic的controller, 随时得到整个系统的信息。 当有node增加进
来或者fail掉，elastic logic controller会根据这个当前情况计算出理想的
distribution, 并开始移动block。移动block是copy and delete, 系统在近opti... 阅读全帖 |
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l*********2
发帖数: 95 | 30 各位板上的学长学姐,小弟是3+2项目的,现在是大四学生,但已经在普渡大学读机械
系的研究生课程.
我下周就要开始选下学期的课了,但是由于我还不是正是的研究生,没有导师指导选
课,现在比较迷茫.
本人想读固体力学方向,昨天问了一位教我ME4800 finite element analysis的教
授,他向我推荐先修一门弹性力学(CE 59500 - Finite Elements In Elasticity 或者
AAE 55300 - Elasticity In Aerospace Engineering) 然后修读 ME 55900 -
Micromechanics Of Materials 和 ME 61200 - Continuum Mechanics.
大家觉得如何?本人打算硕士毕业出来找工作，想多读些实用的课程。
普渡non-theis硕士的修读计划是读10门硕士课程即可，数学课（MA）至少读一门
，但是我也完全没思路,不知道选那些有用.一直想找本院的师兄师姐问问,无奈没有找
到读固体陆雪的,所以向板上求助.
今早用googl... 阅读全帖 |
|
l*********2
发帖数: 95 | 31 各位板上的学长学姐,小弟是3+2项目的,现在是大四学生,但已经在普渡大学读机械
系的研究生课程.
我下周就要开始选下学期的课了,但是由于我还不是正是的研究生,没有导师指导选
课,现在比较迷茫.
本人想读固体力学方向,昨天问了一位教我ME4800 finite element analysis的教
授,他向我推荐先修一门弹性力学(CE 59500 - Finite Elements In Elasticity 或者
AAE 55300 - Elasticity In Aerospace Engineering) 然后修读 ME 55900 -
Micromechanics Of Materials 和 ME 61200 - Continuum Mechanics.
大家觉得如何?本人打算硕士毕业出来找工作，想多读些实用的课程。
普渡non-theis硕士的修读计划是读10门硕士课程即可，数学课（MA）至少读一门
，但是我也完全没思路,不知道选那些有用.一直想找本院的师兄师姐问问,无奈没有找
到读固体陆雪的,所以向板上求助.
今早用googl... 阅读全帖 |
|
s********n
发帖数: 26222 | 32 【 以下文字转载自 Military 讨论区 】
发信人: smokinggun (硝烟), 信区: Military
标 题: 茅于轼之子茅为星是否在向美国走私稀土材料？
发信站: BBS 未名空间站 (Wed Nov 30 20:30:02 2011, 美东)
http://www.greatexportimport.com/s-weixing_mao/434214?Asp
有没有啥可疑的地方啊，瞧着tmd生意很大啊。
Weixing Mao
Save | Post a comment |
Tips： latest trade records and complete B/L information of Weixing Mao is
available for registed member.Latest transaction will be displayed in your
follow.
[Register now for access!]
All trade records
02/11/2010: 100pct Silicone Production Part... 阅读全帖 |
|
s********n
发帖数: 26222 | 33 http://www.greatexportimport.com/s-weixing_mao/434214?Asp
有没有啥可疑的地方啊，瞧着tmd生意很大啊。
Weixing Mao
Save | Post a comment |
Tips： latest trade records and complete B/L information of Weixing Mao is
available for registed member.Latest transaction will be displayed in your
follow.
[Register now for access!]
All trade records
02/11/2010: 100pct Silicone Production Parts Of Silicone Electric
Insulator Partner: Weixing Mao [Read B/L ↓]
B/L Information Is For Reference Only
10/31/2011: With 729 ... 阅读全帖 |
|
s********n
发帖数: 26222 | 34 http://www.greatexportimport.com/s-weixing_mao/434214?Asp
有没有啥可疑的地方啊，瞧着tmd生意很大啊。
Weixing Mao
Save | Post a comment |
Tips： latest trade records and complete B/L information of Weixing Mao is
available for registed member.Latest transaction will be displayed in your
follow.
[Register now for access!]
All trade records
02/11/2010: 100pct Silicone Production Parts Of Silicone Electric
Insulator Partner: Weixing Mao [Read B/L ↓]
B/L Information Is For Reference Only
10/31/2011: With 729 ... 阅读全帖 |
|
s********n
发帖数: 26222 | 35 茅于轼之子茅为星在做上海向美国出口电子陶瓷绝缘体生意，而这玩意儿多含稀土成分
，而且有军事应用价值，不知道其中是否有猫腻。
http://www.greatexportimport.com/s-weixing_mao/434214?Asp
有没有啥可疑的地方啊，瞧着tmd生意很大啊。
Weixing Mao
Save | Post a comment |
Tips： latest trade records and complete B/L information of Weixing Mao is
available for registed member.Latest transaction will be displayed in your
follow.
[Register now for access!]
All trade records
02/11/2010: 100pct Silicone Production Parts Of Silicone Electric
Insulator Partner: Weixing Mao [Read B/L ↓]
B... 阅读全帖 |
|
s********n
发帖数: 26222 | 36 咋个无聊伐？
茅于轼之子茅为星是否在向美国走私稀土材料？
陶瓷电子绝缘体多数含稀土成分在内
http://www.greatexportimport.com/s-weixing_mao/434214?Asp
有没有啥可疑的地方啊，瞧着tmd生意很大啊。
Weixing Mao
Save | Post a comment |
Tips： latest trade records and complete B/L information of Weixing Mao is
available for registed member.Latest transaction will be displayed in your
follow.
[Register now for access!]
All trade records
02/11/2010: 100pct Silicone Production Parts Of Silicone Electric
Insulator Partner: Weixing Mao [Read B/L ↓]
B/L Information Is For Re... 阅读全帖 |
|
s********n
发帖数: 26222 | 37 茅为星以上海为基地，向美国出口多个集装箱的陶瓷电子绝缘体，
陶瓷电子绝缘体多数含稀土成分在内
http://www.greatexportimport.com/s-weixing_mao/434214?Asp
Weixing Mao
Save | Post a comment |
Tips： latest trade records and complete B/L information of Weixing Mao is
available for registed member.Latest transaction will be displayed in your
follow.
[Register now for access!]
All trade records
02/11/2010: 100pct Silicone Production Parts Of Silicone Electric
Insulator Partner: Weixing Mao [Read B/L ↓]
B/L Information Is For Reference Only
10/31/201... 阅读全帖 |
|
发帖数: 1 | 38 最近收到了选组信息，以下是HR提供的list，希望前辈们可以提供一些建议，谢谢大家！
AWS Builder Tools:
Developer Productivity and Tools is a group of teams focused on making
Amazon Web Services a
positive and productive developer experience. We include services like AWS
Elastic Beanstalk and AWS
CloudFormation, language specific SDKs, Tools, Documentation, and Management
consoles that make it
easy to get started with AWS, simple to use, and hard to imagine life
without. Through our educational
content, blogs, and conference activity we... 阅读全帖 |
|
发帖数: 1 | 39 最近收到了选组信息，以下是HR提供的list，希望前辈们可以提供一些建议，谢谢大家！
AWS Builder Tools:
Developer Productivity and Tools is a group of teams focused on making
Amazon Web Services a
positive and productive developer experience. We include services like AWS
Elastic Beanstalk and AWS
CloudFormation, language specific SDKs, Tools, Documentation, and Management
consoles that make it
easy to get started with AWS, simple to use, and hard to imagine life
without. Through our educational
content, blogs, and conference activity we... 阅读全帖 |
|
s********n
发帖数: 26222 | 40 【 以下文字转载自 Military 讨论区 】
发信人: smokinggun (硝烟), 信区: Military
标 题: 茅于轼之子茅为星是否在向美国走私稀土材料？
发信站: BBS 未名空间站 (Wed Nov 30 20:30:02 2011, 美东)
http://www.greatexportimport.com/s-weixing_mao/434214?Asp
有没有啥可疑的地方啊，瞧着tmd生意很大啊。
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02/11/2010: 100pct Silicone Production Part... 阅读全帖 |
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b***i
发帖数: 10018 | 41 Top Ten Characteristics of Good Running Form By Rick Morris
Foot Strike Under Your Center of Gravity
Did you ever try to drive your car while pressing on both the gas and
the brakes at the same time? Probably not. If you did you would be
slowing yourself down and wasting a lot of energy. Running with your
foot strike in front of your body is the same thing. When you plant
your foot in front of your body you’re putting on the brakes with
each step you take. You’re slowing down and wasting valuabl... 阅读全帖 |
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b***i
发帖数: 10018 | 42 Top Ten Characteristics of Good Running Form By Rick Morris
Foot Strike Under Your Center of Gravity
Did you ever try to drive your car while pressing on both the gas and
the brakes at the same time? Probably not. If you did you would be
slowing yourself down and wasting a lot of energy. Running with your
foot strike in front of your body is the same thing. When you plant
your foot in front of your body you’re putting on the brakes with
each step you take. You’re slowing down and wasting valuabl... 阅读全帖 |
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p***r
发帖数: 4859 | 43 ☆─────────────────────────────────────☆
wolfstar76 (天狼星) 于 (Thu Oct 22 20:30:05 2009, 美东) 提到:
http://www.sportsscientists.com/2008/04/running-technique-foots
zt 如下：
Running technique: The Footstrike
Heel vs. Midfoot vs. Forefoot: How do elite runners land?
I've finally gotten around to this post, which is probably two weeks in the
making, and it follows on from our recent series on running shoes. That
series began by looking at whether shoes are in fact as much a cause of
injury as a cure, ... 阅读全帖 |
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F******e
发帖数: 197 | 44 和一般的vps没有区别。
这种large instance性能还是很好的。
然后elastic ip不是必须的。每个instance是有公共ip的，不过你每次启动新的
instance，都会有新的ip。所以elastic ip的作用是，你可以在amazon那儿reserve一
个固定的ip，每次启动新的instance后都绑定在这个ip上。
也没有别的什么要注意的。
ps，用完记得关，amazon按照instance存活的时间长度收费。
你这个instance估计一个小时两三刀呢，所以放个半个月或者两个月的，账单就让你吐
血了。
再ps，elastic ip在绑定在instance上的时候，是免费的，但如果没绑定仅仅reserver
，是要收费的。所以你要是reserver了elastic ip，记得最后用完的时候释放掉。要不
然放个几年，都有账单，当然这部分不贵了 |
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S*A
发帖数: 7142 | 45 最近在上经济的课。
这么分析这个外包是不是和算：
种草我有绝对优势，但是没有相对优势。
因为我的机会成本太高。
而且精英草坪是比较 price elastic 的，主要有这些原因：
1）很多竞争的公司和替代产品。这个就说提价人家就用别人的了，选择很多。
2）精英草坪属于奢侈品，不是非有不可的，奢侈品比较 elastic.
3）精英草坪是比较特定的草坪，市场面很窄。越窄越 elastic.
所以外包对我连成本都拿不回来的。能管理精英草坪的公司不是没有，
例如很多商业的草坪管理公司就比家里的高很多档次。但是家里一般
没有人愿意出这个价钱来管理。
如果是我家邻居的草坪我还可以考虑考虑，因为成本低很多。
我搞的时候走多两步就行了。
而且提高它们的草坪也间接提高我房子的价值。这个叫 cross price
elastic. |
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发帖数: 1 | 46 猎头发给我的，貌似薪水很不错， 他的原话是
Compensation is open for the right person with no limit.
The right candidate must have strong enterprise data experience.
但是我已经找到满意的工作了， 不想再面了。
这个猎头感觉挺靠谱, 以前帮我找过挺多不错的大金融公司。
版上有谁感兴趣可以把简历发给我。[email protected]/* */
需要8年左右 java 经验， 但是感觉应该flexible。
需要6个java developer 和 2 个architect
（我三年经验的时候面过require 5年经验的， 给了onsite， 但是自己没发挥好， 就
是他安排的）
下面是Job description,
6 Java Developers:
Engineers at this asset manager are playing a key role in building the
future of financial services,... 阅读全帖 |
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T******o
发帖数: 136 | 47 basic concept of price elasticity: job keepers are inelastic, job switchers
are elastic. gotta give elastic ppl a better deal to attract them |
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k*****u
发帖数: 578 | 48 据magpul的测试，他们的弹匣可以一直压着弹簧也不会有问题。其实这牵涉到材料科学
上面的三个概念，因为这是我的专业，所以我来给大家说说。这第一个概念叫做
elastic vs. plastic；第二个概念叫做creep；第三个概念叫做ductile to brittle
transition。
先说第一个概念 elastic vs. plastic。弹簧在其设计的弹性范围之内的伸缩都应属于
elastic区域，也就是说是不会有永久的形变导致弹簧失效的。而如果你在三十发的弹
匣里压了三十一发或者故意把弹簧拉长一节，那就会导致plastic deformation，也就
是弹簧的长度会有永久性的变化，这时候弹簧可能就会有不给力的情况了。
第二个概念creep是指的弹簧在长期受力情况下tensile stress和yield stress都会慢
慢变小，也就是说plastic deformation会提早发生。可是注意一点，假如是在室温情
况下，这个过程是会很长的，尤其是在弹簧的材料有很大进步的今天，要等到creep的
发生估计你一辈子都等不到。但是如果温度变高很多，不如说从室温变到几百度... 阅读全帖 |
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h*******a
发帖数: 1753 | 49
Testing: DHS Memo 2 and Memo 3
March 23rd, 2010
Hi friend, it’s really long long time not testing any equipment, everyone
has their up and down moment, there is no excuse for me. There is no any
rubbers and blades that can raise my interest in the past few months.
This month, new DHS rubbers are released: DHS Memo 1, 2 and 3. I’ve got the
Memo 2 in stock, I will get the Memo 1 and Memo 3 in coming few days.
Yesterday, I have tried the Memo 3, I’m quite impressed with it’s
performance and I wond... 阅读全帖 |
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b***i
发帖数: 10018 | 50 How do your decrease your ground contact time and increase your air
time? You need to increase your running power or your ability to produce
force quickly. The good news is that your muscles probably already have
that ability – you just need to let them do their job. There is a
principle of muscle physiology called the “stretch-reflex” principle.
Your muscles are a lot like springs or rubber bands. When you stretch
your muscles they store a lot of energy, just like when you stretch a
rubber band... 阅读全帖 |
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