初速度

Gas flow from borehole directly relates to the gas emission from drill drainage coal bed and judging the initial velocity of gas emission from the borehole. Therefore the study on the change and trend of gas flow has significant practical value.

钻孔瓦斯流量直接关系着钻孔抽放煤层瓦斯涌出量及钻孔瓦斯涌出初速度的判定，因此研究钻孔瓦斯流量的变化及发展趋势具有较大实用价值。

Gas flow from borehole directly relates to the gas emission from drill drainage coal bed and judging the initial velocity of gas emission from the borehole .

钻孔瓦斯流量直接关系着钻孔抽放煤层瓦斯涌出量及钻孔瓦斯涌出初速度的判定，因此研究钻孔瓦斯流量的变化及发展趋势具有较大实用价值。

The main contents are as follows:(1) Configuration design and Experiment research The projectile configuration of penetration weapon is designed according to the technical and tactics target, including the structure design of the projectile , the structure design of the empennage and the structure design of the concrete target. The simulation experiments studying the relation between velocity and concrete intensity and penetration depth have been carried out.

主要内容如下：(1)结构设计和试验研究根据技术指标完成了子母弹侵彻战斗部模拟弹体的尺寸和结构设计，尾翼的尺寸和设计结构、靶体尺寸和结构设计，完成了模拟弹丸混凝土的模拟试验，研究靶体强度和初速度对侵彻深度的影响；通过对结构设计的研究和弹丸侵彻混凝土的试验研究，完善钻地弹设计方案。

The purpose of this laboratory activity is to determine whether the time of flight of a ball launched horizontally off a table on level ground changes as the initial speed changes.

本实验的目的是测定从水平面上的工作台水平射出的小球的飞行时间是否随着初速度的变化而变化。

Torpedos are like missiles that don't chase their target; they're launched in a direction from the MTB weapon and continue on their initial velocity. Like missiles, they activate on contact or a small range.

鱼雷，鱼雷有点像导弹，只是鱼雷也无法追击目标，当MTB发射鱼雷后，鱼雷只能依靠只身的初速度向前运动，直到距目标一定距离或受到撞击时才引爆。

The simulation results of the model are consistent with the results of wind tunnel experiments. It shows macroscopically the rationality of the distribution function of lift-off velocity of saltating sand grain.

数值计算结果显示，风沙流垂向质量百分浓度与风洞实验结果符合得较好，这在宏观上说明沙粒起跳初速度分布函数的合理性。

The vertical distribution of Aeolian sand current Based on the distribution function of lift-off velocity of saltating sand grain, this thesis develops a vertical distribution model of Aeolian flow linking with the number of lift-off sand grains percent time percent sand area. The thesis realizes the combination of microcosmic researches and macroscopical researches of Aeolian wind sand and solves primarily the isjunction of microcosmic researches and macroscopical researches.

4风沙流的垂向分布以本文获得的沙粒起跳初速度分布函数为纽带，结合本文获得的单位时间单位面积沙床起跳沙粒数，建立风沙流的垂向分布模型，实现风沙运动宏观研究和微观研究相结合，初步解决长期以来宏观与微观研究相脱节问题。

The number of lift-off sand grains percent time percent sand bed area Based on the lift-off velocity distribution function of saltating sand grain, this thesis gains the number of lift-off sand grains percent time percent sand bed area which ranges from 6796 to 8846900 number/(s·m2) by combination motion model of single saltating sand grain and some motion parameters of saltating sand grains and the flux of wind sand current from wind tunnel experiment.

单位时间单位面积沙床起跳沙粒数利用本文获得的沙粒起跳初速度分布函数，结合沙粒跃移运动学模型以及风洞实验中获得的沙粒跃移运动参数以及输沙量，反演出一定风场条件下单位时间单位面积沙床起跳沙粒数，变化范围6796-8846900个/(s·m2)，并满足。

Also, the smaller turrets (armed with TMG's) were the same. At first the T-28 was armed with a 76.2 mm short-barreled tank gun: KT-28. Later versions received a more powerful tank gun L-10 with a barrel length of 26 calibers and muzzle velocity of

此外，安装机枪的小炮塔也一样，最初T-28装备的是一门KT-28型短管76.2 mm坦克炮，后来的改进型号采用的是一门威力更大的L-10坦克炮，炮口初速度达到了555米/秒。

Under above mentioned conditions, the initial reaction rate and enantiomeric ratio of the reaction are 5.88 mmolL^(-1)h^(-1) and 83. After reaction time of 6h, the yield and the product e.e.

在上述条件下，反应初速度和对映体选择比分别为5.88mmolL^(-1)h^(-1)和83，反应6h，产率为47.6%，产物e.e。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。