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The results show that dynamical ductil-ity dominated final velocity of fragments. During tube expansion, the shear fracture appears preferentially a-long the adiabatic shear bands under positive stress, so the adiabatic shear band determines the size and shapeof fragments. Though the fragmentation behaviour of medium carbon Si - Mn bainific steel is close to that ofsteel 50SiMnVB, medium carbon Si - Mn bainitic steel is an ideal candidate material for the tubular bombs be-cause it is better in dynamical ductility, which can enable the tubes to gain high speeds before fragmentation.

结果表明：材料动态塑性是决定破片最终速度的主要因素；圆管膨胀时外表面形成以剪切为主的裂纹，并向内扩展，接近内表面的绝热剪切带伴随着圆管的膨胀而扩展，并未出现失稳现象，但在正应力的作用下成为优先的断裂通道、决定破片的尺寸和形态；中碳Si-Mn贝氏体钢与50SiMnVB钢的破碎性能相近，但贝氏体钢动态塑性很更好，破碎前的膨胀量较大、更有利于提高破片初速，是弹箭比较理想的候选材料。

This represents a first approximation to inelastic modelling that boasts the advantage of large problem sizes and very fast execution speeds.

这标志着第一近似值弹塑性模型，公司拥有的优势，大问题的大小和执行速度非常快。

One of the cases they looked at was RAF Flight Lieutenant Hubbard who twice claimed to have seen "a flat disc, light pearl grey in colour, about 50 feet in diameter" flying low over Farnborough at speeds to 800 to 1,000 mph.

其中一个案件是他们期待在英国皇家空军飞行中尉哈伯德谁两次声称已经看到"平盘，轻珍珠灰色的颜色，大约50英尺，直径"低空飞行的波音800的速度为1000英里。

They are like streetcars running contentedly on their rails and they despise the sprightly flitter that dashes in and out of the traffic and speeds so jauntily across the open country.

他们就像街上的电车一样，在他们既定的轨道上行驶，而对于那些不时出没于车水马龙间和欢快地奔驰在旷野上的廉价小汽车却不屑一顾。

They are like streetcars running contentedly on their rails and they despise the sprightly flitter that dashes in and out of the traffic and speeds so jauntily across the open country .

他们就像街上的电车一样，在既定的轨道上行驶，而对于那些不时出没于车水马龙间和欢快地奔驰与空旷原野上的廉价小汽车却不屑一顾。

They are like streetcars running contendedly on their rails and they despise the sprightly flitter that dashes in and out of the traffic and speeds so jauntily across the open country .

他们就像街上的电车一样，在他们既定的轨道上行驶，而对于那些不时出没于车水马龙间和欢乐地奔跑在旷野上的便宜小汽车却不屑一顾。

They are like streetcars running contendedly on their rails and they despise the sprightly flitter that dashes in and out of the traffic and speeds so jauntily across thecountry .

他们就像街上的电车一样，在他们既定的轨道上行驶，而对于那些不时出没于车水马龙间和欢快地奔驰在旷野上的廉价小汽车却不屑一顾。

They are like streetcars running contendedly on their rails they despise the sprightly flitter that dashes in out of the traffic speeds so jauntily across the open country .

他们就像街上的电车一样，在他们既定的轨道上行驶，而对于那些不时出没于车水马龙间和欢快地奔驰在旷野上的廉价小汽车却不屑一顾。

They are not like streetcars running contendedly on theirss rails and them despise the sprightly flitter those daITs in and out of the traffic and speeds so jato the time ofy through the open country .

她们就像街上的电车相同，在她们既定的轨道上行驶，而对于那些不时出没于车水马龙间和欢快地奔驰在空旷田野上的廉价小汽车却不屑一顾。

They are like streetcars running contendedly on their rails and they despise the sprightly flitter that dashes in and out of the traffic and speeds so jauntily across the open country .I respct them; they are good citizens,good husbands,and good fathers ,and of course somebody has to pay the taxes; but I do not find them exciting.

他们就像街上的电车一样，在他们既定的轨道上行驶，而对于那些不时出没于车水马龙间和欢快地奔驰在旷野上的廉价小汽车却不屑一顾。

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。