多中心的

Large scale underground mine development transportation system is a network flow which takes mineral flow as a centre. It always need to optimize multiple objectives, such as minimize the transportation cost, get the best matching between stopes and concentration plants.

大型地下矿山的开拓运输系统实质上是一个以矿石流为中心的网络流，不仅要考虑网络流费用的最小，还要考虑采场与选厂的匹配，是一个多目标问题。

A mathematic model, which deals with the relationship between maximum temperature of thick plate butt multipass welding and weld heat input, interpass temperature, ambient temperature and the distance of measuring points to heat source center, was founded using multivariant nonlinear regression analysis.

采用多元非线性回归的方法，建立了厚板对接多道焊的最高温度与焊接线能量、层间温度、环境温度以及测点到热源中心的距离之间的数学模型。

Swansea has a strong history of innovative and creative engineering which is epitomised by the cutting edge research conducted within the Multidisciplinary Nanot...

斯旺西有创新和创造性的工程强大的历史是由尖端纳米技术在多学科的研究中心进行的缩影。

Swansea has a strong history of innovative and creative engineering which is epitomised by the cutting edge research conducted within the Multidisciplinary Nanotechnology Centre.

斯旺西有创新和创造性的工程强大的历史是由尖端纳米技术在多学科的研究中心进行的缩影。

The static and dynamic characteristics of the beam of a gantry-type machining center are analyzed by means of ADAMS and ANSYS. Considering effect of gravity and cutting forces, the static deformation of the beam is obtained after calculating the interacting forces between the guide and the slide block by ADAMS. Moreover, the contact parameters of the guide surface are acquired by dynamic tests and parameter identification, then they are applied to the simulation model of the beam-slide box system, whose natural frequencies and modal shapes are achieved by modal analysis. Furthermore, the effect of changes of the contact parameters on the dynamic behavior of the beam-slide box system is also investigated.

对一种国产龙门式加工中心的横梁关键部件，采用机械系统多刚体动力学仿真软件ADAMS和有限元分析软件ANSYS进行了静动态特性分析；在考虑重力和切削力作用下，由ADAMS计算出导轨与滑块间的作用力，从而计算出横梁部件的静态变形；通过动态测试和参数辨识方法获得导轨结合面特性参数并将其应用到横梁滑箱系统整体有限元模型中，经过模态分析得到系统固有频率和各阶振型图，并进一步分析了结合面参数变化对横梁滑箱系统整体动态特性的影响。

At high powers the nonlinear part of the index of refraction becomes important and causes a higher index of refraction in the center of the laser beam where the laser is brighter than at the edges causing a feedback that focuses the laser even more.

在高权力，非线性部分的折射率变得很重要的原因和较高的折射率为中心的激光束，在激光亮度比是在边缘，造成了反馈，重点激光甚至更多。

Xinhua cited officials at the China Earthquake Networks Center as saying at least 18 aftershocks have been reported and that more temblors exceeding magnitude 6 were likely to occur in the coming days.

新华社引用中国地震网中心的官员的话说，至少报道18次余震，在接下来的几天，会有更多次超过6级的余震可能会发生。

The pay-scale in IJN is much better than that in the Health Ministry, but this is not due to supplementary income derived from private practice after office hours but by a better salary structure.

国家心脏中心的薪酬，比起卫生部的要好得多，但这不是因为工作时间以外私人业务的附加收入，而是一个更好的薪金结构。

Horvitz , vertegaal , selker and picard are among a small but growing number of researchers trying to teach computers , phones , cars and other gadgets to behave less like egocentric oafs and more like considerate colleagues

像霍维兹、维提加尔、塞尔克与毕凯这类的研究人员数量并不多，但正在逐渐增加，他们试图教化电脑、电话、汽车与其他数位玩意儿的行为，希望它们从自我中心的蠢蛋变成体贴的同僚。

The work of our Center began some 40 years ago, which accounts for my grey hair.

我们中心的工作是40多年前开始的，我的白发也随着工作的开展不断增多。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。