查询词典 grain

These alloys will maintain an extremely fine grain size at temperatures well beyond their recrystallization temperature, up to the temperature where the second phase finally dissolves or coarsens, which allows grain growth to proceed.

这些合金将维护极端微粒的大小在温度充分超过他们的再结晶温度，由温度决定，第二个阶段最后溶化或变粗，允许晶粒生长进行通常，二种锻炼的脾气是可利用的：光锻炼，轻微地执行在温度在再结晶温度之上和软绵绵地锻炼，执行几百程度更高，在温度在迅速晶粒生长开始的点之下。

The result shows that B combines with N prior to Al at high temperature and brings about coarse particles of BN (about 900 nm), which effectively reduces the amount of fine and dispersive AlN particles, and BN precipitate clinging to MnS precipitation coarsens MnS particles, the pinning of austenite grain boundary is alleviated and the grain growth of ferrite is suppressed.

结果表明高温时B优先于Al与N结合生成粗大的BN粒子(约900 nm)，有效降低了热轧过程细小而弥散的AlN析出量，同时BN依附MnS析出而粗化MnS粒子，减弱了细小弥散析出粒子对奥氏体晶界钉扎以及相变后铁素体晶粒长大的抑制作用。

The experimental results show that microwave sintering promotes the densification of green compacts with higher heating rate and reduced sintering cycle. The sintered relative density of 99.8% can be achieved during microwave processing under appropriate conditions. In addition, microwave sintering improves the uniformity and homogenization of W grain size, and yet leads to growth of W grain. Fe sintering aid degrades the microstructure uniformity and further coarsens W grains. The present investigation demonstrates the feasibility of applying microwave sintering technique to consolidate W-Cu composites and its promising outlook in reducing production cycle and cost.

结果表明：微波烧结升温速度快，周期短，能促进W-Cu材料的致密化；在适当条件下，微波烧结能获得相对密度达99.8%的W-Cu样品；微波烧结能改善W-Cu样品中两相分布的均匀性和W晶粒尺寸的一致性，但引起W晶粒的快速长大；Fe烧结助剂导致W-Cu材料显微组织均匀性变差，并引起晶粒进一步粗化；微波烧结技术能够应用于W-Cu材料的制备，在缩短生产周期、降低生产成本方面具有潜在优势。

The author made clear the population of first generation of army migration in Yunnan is about 800000 who were main component of Han migration. Most of them entered into Yunnan in early days of Ming. They resided and distributed by garrison troops opening up wasteland and growing food grain. The second kind of migration was exiled in Yunnan. They had many populations in Ming. The author also considering there weren't that the businessman conscribed cosmically farmers and moved to Yunnan opening up wasteland and growing food grain.

特别是对军事移民的时间、方式、组织形式、军籍制度及其人口的发展等作了细致考察，基本弄清汉族军事移民第一代人口数约八十余万，是汉族移民的主流，他们主要在明代初期进入，明代中后期三征麓川和反对缅甸洞吾王朝侵扰时应有部分军队留屯云南；第二大类移民是罪徙移民，即贬谪安置或充军人口，终明一代都有大量的这类移民进入云南，只是没有确切的史料依据，对其数量难以考说。

The microstructure, grain orientation and grain boundary in electroformed copper prepared under specific conditions were studied using SEM, TEM and EBSD.

采用SEM，TEM和EBSD研究了电铸Cu的微观组织形貌、晶粒取向和晶界特征。

Now, the problem of grain of China has already been solved basically, but we must not relax vigilance , have correct understanding to the possibility that our country will be embargoed by the America in the future, find the correct way to realize Chinese grain security.

美国的粮食武器对中国也有所运用，目前中国的粮食问题虽然已经有所改善，但是今后我国还有遭到粮食禁运的可能性，应当通过正确的途径实现中国粮食安全。

And when the grain was flailed they winnowed it, casting it up from great flat bamboo baskets into the wind and catching the good grain as it fell, and the chaff blew away in a cloud with the wind.

扬场的时候，用大大的扁平竹簸箕把谷物在风中扬起来，谷物落下时，接住谷粒，团团的谷皮则随风吹走了。

After tempering at 700℃, bainitic ferrite laths started to coarsen. The grain boundary characteristics and effective grain size of ULCB steels can be measured by EBSD technique.

晶界特征结果显示，轧态和回火态组织均存在大量低能量小角度晶界和低Σ值重位点阵晶界。

Due to many of atom diffusion channels during secondary heating, the heating temperature required for liquidizing of grain boundaries and spheroidizing of grain surfaces is low and the holding time becomes short.

在二次加热过程中，原子扩散通道多，晶界液化及颗粒球化所需的加热温度低，等温时间短。

Seen from the present grain production and economic development, national grain is structurally overabounded and at the low security level, with regional security and insecurity in coexistence. Besides, cultivated land resources , water resources and farmers' economic income are all not optimized.

从我国粮食生产状况与经济发展水平看，全国粮食生产处于结构性过剩与低水平安全中，区域性粮食安全与不安全并存；耕地资源、水资源以及农民的经济收入状况等均不容乐观，加之自然灾害加重，粮食生产的环境成本将随之增加，这将影响我国未来粮食安全。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。