查询词典 arch

Dynamic model of satellite is built up with astronomic method, and a short-arch forecast arithmetic of satellite orbit in short arch with single site is given, which is of high precision when only angle data is available.

本文使用了天文方法建立了人造卫星运动的数学模型，给出了一种只使用单站短弧段测角数据对人造卫星轨道进行高精度预测的算法。

Based on the equilibrium equation of an arch element the cubic nonlinear dynamic model with second order is established and the nonlinear differential dynamic system without constant term is obtained through a transfer process of T=U+b. Hence three fixed points and the homoclinic orbits are found. The critical condition of the chaotic vibration of the elastic arch is given by using the method of Melnikov function. The numerical results of the stationary and chaotic motion are given and discussed.

首先利用拱的单元平衡方程建立了拱的二阶三次非线性动力学模型；然后通过变换使方程转化为不含常数项的非线性微分动力系统，并由此得到无扰动系统的3个不动点与同宿轨道；再用Melnikov函数法给出了发生混沌的临界条件；最后给出了该系统出现定常运动和混沌运动的数值结果。

The measurement covered the tooth material,premolar diametre,premolar basal arch widthand basal arch length. The ratios of PMD/TM, PMBAW/TM and BAL/TM were calculate.

测量牙量、双尖牙弓宽径、双尖牙根尖基骨宽径、基骨弓长度，并计算PMD/TM、PMBAW/TM、BAL/TM值，对其进行统计学处理与分析。

The fingers are moved by the arm in an arch, and when the tempo increases, the arch becomes flatter; at maximum speed the arch resembles a straight line.

手臂以拱形带动手指移动，当速度增加时，拱形就变得平坦些；当速度最快时，那拱形变得象一条直线。

Vegetarian and famous park are to the Vegetarian Hall, overlooking the rushing river north of Wangjiang Ting, as well as Yu the door arch, Glory shines through the arch, Green went straight step through the arch, hundred steps ladder, Wang Jiangting, great-grandmother mountain, trekking India stone, Puji Bridge, Guiyi pool attractions, is a set of artifacts to view, worship prayer, leisure and health in one place.

园内有以素食而远近闻名的斋堂，眺望滔滔北江水的望江亭，还有禹门牌坊、灵光普照牌坊、青去直步牌坊、百步梯、望江亭、太婆山、仙印石、普济桥、龟蛇池等景点，是一块集文物观赏、祭拜祈愿、休闲养生于一体的好地方。

The calculated results of the arch dam stress by the present method can be used for safety assessment of arch dams according to the national arch dam design code.

表明用本文分析方法得出的应力结果可以按现行的拱坝设计规范规定的应力标准评价拱坝坝体安全度。

This research is very important to improve the safety of high arch dams against strong earthquakes. It provides science references for design of high arch dams and technical guidance for taking steps to reduce hydrodynamic pressures and dynamic responses of high arch dams in earthquakes.

研究了拱坝在强地震中的动水压力和降低动水压力的气幕隔震技术，对提高拱坝的抗震安全性具有重要的科学意义和实际价值，对高拱坝的抗震设计和采取工程措施减小动水压力提供理论依据和技术指导。

Trough the analysis of stabilization safety on Tengzigou arch dam, some conclusions are obtained in the following:(1) Tengzigou arch dam is safe under normal poll level ;(2) stabilization safety factor of Tengzigou arch dam is about 4-5;(3) It is proved that combinatorial reinforcement measures are effective and feasible.

对藤子沟拱坝的数值计算和模型试验分析表明：(1)藤子沟水电站在正常蓄水位作用下，坝体和两岸坝肩是稳定的；(2)藤子沟拱坝的整体安全度大概为4～5左右；(3)东北院提出的对左岸泥岩层挖除处理并用混凝土置换的加固除险措施经研究表明该加固措施是有效、可行的。

A study was performed of the randomness of external loads on high arch dams,including flood,earthquake,landslide of mountains,etc.,the weakening of concrete strength of arch dams and rock strength of dam foundation,and the fuzziness of evaluation criterion.The disadvantages of conventional deterministic assessment methods for the safety of arch dams based on the strength theory and stability theory were analyzed respectively.It is suggested that fuzzy mathematics theory should be introduced to safety evalua...

研究高拱坝洪水、地震、山体滑坡等外载荷，坝身混凝土、坝基岩石材料强度弱化等的随机性，以及评价准则的模糊性；分析了高拱坝分别基于强度理论和稳定理论确定性评价方法的不足，提出应该利用模糊数学方法解决具有随机性、模糊性的高拱坝安全评价问题；建立了基于结构可靠度理论的高拱坝失效概率故障树模型并给出了具体算例。

The arch was used by the early cultures of the Mediterranean area chiefly for underground drains, but it was the Romans who first developed and used the arch extensively in aboveground structures. Roman builders perfected the semicircular arch made of separate blocks of stone.

拱最初在地中海早期文化中用来建设地下水渠，但古罗马人最先开发和广泛的利用它作为地上建筑的结构，他们完善了由分段的石块组成的半圆形拱。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了