查询词典 three-four time

The explosively formed projectile with fins for a cover charge structure by LS-DYNA software which four covers were conglutinated on the liner was studied by three-dimensional numerical simulation. The mechanism of forming EFP with fins was discussed based on the curves of velocity and pressure vs time of the liners. A contrastive analysis was carried out on the three kinds of liners which include big-cone shaped liner, imperfect-sphere shaped liner and arc-cone shaped liner.

采用LS-DYNA对在药型罩上粘附隔板结构形成带尾翼型爆炸成型弹丸(explosively formed projectile，EFP)进行三维数值模拟，从药型罩微元压跨速度和压力的角度初步探讨了形成尾翼型EFP的机理，对同一直径的大锥角型、球缺型和弧锥结合型药型罩形成的尾翼型EFP进行了对比分析，三种结构药型罩均能形成较为明显的尾翼，其中大锥角型药型罩得到的EFP速度最高。

Upon this Occasion of removing my Ammunition, I took occasion to open the Barrel of Powder which I took up out of the Sea, and which had been wet; and I found that the Water had penetrated about three or four Inches into the Powder, on every Side, which caking and growing hard, had preserv'd the inside like a Kernel in a Shell; so that I had near sixty Pound of very good Powder in the Center of the Cask, and this was an agreeable Discovery to me at that Time; so I carry'd all away thither, never keeping above two or three Pound of Powder with me in my Castle, for fear of a Surprize of any kind: I also carry'd thither all the Lead I had Belt for Bullets.

烧木炭的事顺便就谈到这里。再说有一天，我正在那里砍柴，忽然发现，在一片浓密的矮丛林后面，好像有一个深坑。我怀着好奇心想进去看看。我费力地走进洞口，发现里面相当大。我在里面站直了还绰绰有余，甚至还能再站一个人。可是说实在的，我一进去就赶快逃出来，因为我朝地穴深处一看，只见里面一片漆黑，在黑暗中，忽然看见有两只发亮的大眼睛，也不知道是魔鬼的眼睛，还是人的眼睛，在洞口射进去的微弱光线的反射下，那对眼睛像两颗星星闪闪发光。

Upon this Occasion of removing my Ammunition, I took occasion to open the Barrel of Powder which I took up out of the Sea, and which had been wet; and I found that the Water had penetrated about three or four Inches into the Powder, on every Side, which caking and growing hard, had preserv'd the inside like a Kernel in a Shell; so that I had near sixty Pound of very good Powder in the Center of the Cask, and this was an agreeable Discovery to me at that Time; so I carry'd all away thither, never keeping above two or three Pound of Powder with me in my Castle, for fear of a Surprize of any kind: I also carry'd thither all the Lead I had Belt for Bullets.

在这次转移军火时，我也顺便打开了我从海上捞起来的那桶受潮的火药。结果发现，火药四周进了三四寸水，结成了一层坚固的硬壳，可里面部分却完好无损，仿佛壳里的果仁保存得很好。我从桶里弄到了差不多六十磅好火药，这真是一个可喜的收获。不用说，我把全部火药都搬了过去。从此以后，我在城堡里最多只放三磅火药，唯恐发生任何意外。另外，我又把做子弹的铅也全部搬了过去。

For example, zero-dimensional, one-dimensional line, the two-dimensional surface, three-dimensional three-dimensional, and even four-dimensional space-time.

比如，零维的点、一维的线、二维的面、三维的立体、乃至四维的时空。

For example, the zero-dimensional, one-dimensional line, the two-dimensional surface, the three-dimensional to three-dimensional, as well as four-dimensional space-time.

比如，零维的点、一维的线、二维的面、三维的立体、乃至四维的时空。

It was composed of 75% silver and 25% copper, had a six-pointed star on one side, a Roman numeral III on the other, and — weighing in at four-fifths of a gram — was the lightest coin ever produced by the US Mint. The silver three cent piece was discontinued by the Coinage Act of 1873; at that time, a three cent nickel coin was issued, made up of copper and nickel and slightly larger than the silver version.

改硬币是由75%的银和25%的铜铸造，图案的一面有一个六角星，另一面是罗马数字III，重量只有1克的5分之4 -这枚硬币是美国造币厂有史以来发行的最轻的硬币。1873年通过的《硬币法案》，停用了这种硬币；与此同时发行了由铜和镍铸造的3美分镍币，这种硬币比银版硬币略大一些。

But from the point of view of the relativity theory, time as well as space is changed by passing from one c.s. to another, and the Lorentz transformation considers the transformation properties of the four-dimensional time-space continuum of our four-dimensional world of events.

但是从相对论的观点看来，时间和空间从一个坐标系过渡到另一个坐标系时都是要改变的，而洛伦兹转换就是考察事件的四维世界的四维时空连续区的转换性质的。

ResultsThe optimized extraction technology for Huang-lian-xiao-ke Granule was as follows: Copis chinensis Franch. and the other four kinds of raw materials in the origin prescription were decocted separately; after soaked for 30min, the coarse powder of Copis chinensis Franch was decocted with 12,10 times water each time and both for 1.5h; after soaked for 30min, the four kinds of raw materials were decocted together for 1.5h just one time with 10 times water.

结果优选出的提取工艺为：黄连与原方中其余四味药分开提取；黄连粗粉浸泡30 min后，用12，10倍量水提取2次，提取时间均为1.5 h；其余4味药一起提取，浸泡30 min，加10倍量水提取1次，提取时间为1.5 h。

In this scheme, four PLLs are set in the condition of relay for frequency output.The frequency transform time is greatly compressed by the alternate work of four PLLs in comparison with the hop time for frequency transformation of a single PPL.

在本方案中，运用了四个锁相环进行接力式的频率输出，通过四个锁相环的交替工作，使得频率输出改变的时间较之通过单个锁相环改变锁相频率的跳频时间获得了大幅度的压缩。

Have been selected as statistical index, realizing for the first time the quantitative analysis of the high speed railway capacity with mixed high and medium speed train operations, and the huge amount of plannings of would be unimageable under the condition of manual drawing In the analysis four prime factors--the fleeting interval of high and medium speed trains, the matching of speed for high and medium speed trains, the number of inter-mediate stoppings and the train performance approach, have been given special analysis And a quantitative analysis has been made for the first time with regard to the impact of the variation of above four factors on the demand for the high speed train sets, and concerning conclusions have been drawn from the quantitative analysis.

其中着重分析了高中速列车追踪间隔、高中速列车速度匹配关系、中间站设置数量、组织方式等四个影响通过能力的主要因素。同时，首次定量分析了上述因素的变动与高速动车组需求数量间的关系。此外，从上述量化研究中得出了有关结论。

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。