特性

In addition, the method of Newmark is used to simulate and numerate the vibration characteristics of the rigid suspension of overhead contact system and to compare the dynamic vibration characteristics at different speeds and different spans.

利用Newmark方法对刚性悬挂的振动特性进行了数值计算和仿真模拟，比较了不同速度，不同吊点间距下接触网刚性悬挂的振动特性。

To investigate the influence of an upstream ramp on film cooling heat transfer coefficient, a numerical simulation method on the distributions of the flow fields and heat transfer coefficient was adopted with different heights of upstream ramp s in several ratios.

为了获得气膜孔上游放置斜坡对气膜孔换热特性的影响规律，采用数值模拟方法研究了斜坡的台阶高度分别为0.3D，0.5D和0.75D时在不同吹风比下的流动过程和换热特性分布情况，并与常规气膜孔冷却结构形式进行了对比。

The main results can beexpressed as follows:(1)Based on πtheory, some affected factors about wave forces are given, and therelation between affected factors and wave forces is analysised by experimentalresults.(2) The distribution of wave press at representative time and reflection nature aregiven and their variety charactes are discussed by experimental results.(3)By comparing the wave forces of quarter-circular breakwater and semi-circularbreakwater under the same wave conditions,some approximately wave forcesexpressions of quarter-circular breakwater are given.(4)Based on VOF method to trace water free surface,solve numerical value ofRANS equation,and get the distributions of flow field and wave press ofquarter-circular breakwater at the same time during one period,the mechanism ofwave force is also discussed elementarily.(5) Based on the result that RANS equation of numerical simulation agree wellwith experimental results,a new approach to study hydraulic natures of quarter-circular breakwater is provided.

其主要结论如下：一、通过π定理，确定影响波浪力的无因次参变量，根据试验结果对其影响因素进行分析；二、基于模型试验，给出典型时刻圆弧面防波堤的同步波压分布和反射特性，讨论它们的变化特点；三、通过相同条件下圆弧面防波堤与半圆型防波堤两种堤型试验波浪力的比较，给出了圆弧面防波堤波浪力的近似方法；四、利用VOF法追踪自由水面，数值求解RANS方程，得到圆弧堤堤体周围的流场和压力场，初步分析了速度涡流与压力场的相互影响；五、对比数值分析与试验结果，探讨数值方法研究圆弧面防波堤水力特性的可行性，提供新的研究途径

Outside the vessel. Firstly, the combustion character of CH.4-Air mixture inside a obturation vessel was analyzed.

首先，分析了甲烷-空气的等容燃烧特性，并且讨论了燃料配比与点火位置因素对等容燃烧产生的影响，同时给出了甲烷-氧气的等容燃烧特性并予以比较。

In this paper,the effects of Exhaust Gas Recirculation and octane number on combustion characteristics of HCCI engine were investigated.

在一台单缸直喷式柴油机上研究了废气再循环对不同辛烷值燃料均质压燃燃烧特性及排放特性的影响。

In recent years, with the development of large capacity and high parameter unit of power station in our country, and the introduction of advanced large boiler manufacture, some new technology of swirling burners are used much more in the power stations.

然而，由于我国电站锅炉燃煤的煤质特性与国外的有一定的差别，因此，尽快掌握这些新型旋流燃烧器的设计思路和运行特性，对我国大型电站锅炉的设计、制造以及运行具有十分急迫与现实的意义。

At present, we offer high quality high proportion fishing fall, high proportion alloy ball, high proportion alloy round stick, high proportion alloy unit, high proportion alloy golf head, high proportion alloy off-centered dipole and other high proportion alloy abnormal units. Production capacity: above 200T/year.

按合金组成特性及用途分为W-Ni-Fe、W-Ni-Cu、W-Co、W-WC-Cu、W-Ag等主要系列，其密度高达16 。5-19.0g/cm3，而被世人称为高比重合金，它还具有一系列优异的特性，比重大：一般比重为16.5-18.75g/cm3，，强度高：抗拉强度为700-1000Mpa，吸收射线能力强：其能力比铅高30-40%，导热系数大：为模具钢的5倍；热膨胀系数小：只有铁或钢的1/2-1/3，良好的可导电性能；具有良好的可焊性和加工性。

Also measured were the change of the characteristics of the ohmic contacts and the schottky contacts.

对器件欧姆接触和肖特基接触在高温退火前后的特性进行了对比分析，确定出了最有利于高电子迁移率晶体管特性提高的退火温度为500℃，退火时间为5min。

In order to study the dynamic characteristic of the oil film pressure sensor, a test using impact excitation method was designed.

为研究油膜压力传感器的动态特性，利用锤击法对该传感器进行了动态特性试验。

Surveying several processes of rainfall, using the automatic hydrocone type ombrometer, analyzing the rainfall character in Dalian, drawing the frequency curve, especially, analyzing the time character of the storm, finding the time character of the storm, moreover, and the rainfall pattern is concerned.

利用安置在大连理工大学校园内的虹吸式自计雨量计，监测了数十场降雨过程，分析了大连市降雨的特点，计算并绘制出频率曲线，尤其对造成危害性较强的暴雨进行了时间特性的分析，结果得出了大连市暴雨的年、月、日以及短历时的时间特性，同时对雨型特点也进行了初步的分析。

They go to town. Would you just ask them?

他们在城里你能问他们吗？

Ossein pretreated for a2 weeks period exhibited the maximum% yield incase of bone gelatin, while the yield from intact skin was higher than that realized incase of de-scaled skin.

预处理时间达2星期的骨胶原表现出最高的骨明胶百分产量，然而从未处理鱼皮中得到的产率比去鳞的鱼皮得到的要高。