查询词典 bore-hole

The dynamic medel and the differential equations of an unsymmetrical projectile traveling in a flexible, increasing twist rifled bore gun tube are developed in this paper. The equations can be used for the study of any case of a projectile traveling in the bore, i.

建立了非对称弹丸在挠性渐速膛线身管内的弹丸动力学模型和运动微分方程组，该方程组可用于对弹丸在渐速膛线身管内的任何情况(定心部不与膛壁接触、弹膛碰撞、贴膛)的运动进行求解。

The research contents of this subject are mainly: Proposing the overall scheme of the soft firing technology, than confirm the best scheme; On the basis of best scheme , set up the mathematical model of soft firing system, and set up the interior ballistic trajectory calculating model among MATLAB/Simulink, set up soft the three-dimensional dynamics model of firing system among ADAMS; Go on joint simulation, simulating the characteristic curve of bore pressure and the sport law of piston and shot; Through adjusting the parameters such as piston quality、the diameter of unilateral valve、 charge weight、charge form coefficient and the delay time of lighting fire etc to make the soft firing system reach the best state of dropping the composition of forces of gun bore and increasing initial velocity of pill.

论文的研究内容主要是：提出软发射技术总体方案，确定最佳方案；在最佳方案的基础上，建立起软发射系统的数学模型，并在MATLAB/Simulink中建立内弹道计算仿真模型，在ADAMS中建立软发射系统的三维动力学模型；进行联合仿真，模拟膛压特征曲线及活塞和弹丸运动规律；通过对活塞质量、单向阀直径、装药量、药形系数、点火延迟时间等参数进行调整，使软发射系统达到炮膛合力下降、弹丸初速提高的最佳状态。

Its high-pressure cylinder has a 3-inch bore and a 3-inch stroke; its low-pressure cylinder has 5 and a quarter inch bore and a 3-inch stroke.

其高压缸有一个3英寸口径和3英寸脑卒中；低中压缸有5个和1季度英寸口径和3英寸的中风。

Upgrading the VIP, water disposal, small bore effluent pipes, large bore pipes, oxidation ponds, ecological principles, problems which arise from communal facilities, breaks and spillages.

升级通气式公共厕所、水处理、小孔流出管，大孔管、氧化槽、生态学原理、公共设施所引起的问题，破裂与溢出。

Upgrading the VIP, water disposal, small bore effluent pipes, large bore pipes, oxidation ponds, ecological principles, problems which arise from communal facilities, breaks and spillages.

升级通气式坑式公共厕所、水处理、小孔流出管、大孔管、氧化槽、生态学原理、公共设施所引起的问题，破裂与溢出。

In order to solve this kind of machining problems,bore reaming process with stepped reaming cutter is applied.Through modification of common reamers and proper machining process applied,combined bore quality can be effectively ensured and machining productivity is satisfied.

为解决此类工件的加工难题，采用阶梯铰刀铰削孔的加工工艺方法，通过对普通铰刀进行改制，并采取适当的加工工艺，可有效确保上述复合孔的加工质量，并满足加工效率的要求。

The predic- tion of A5 explosive in-bore ignition probability was given. Accordingly. the in-bore safety of explosive charge of fuze explosive train componentsi was evaluated.

利用有限元计算结果，给出了引信传爆管和导引传爆管中A5炸药在膛内发射时的起爆概率，从而评价了引信火工品装药的膛内安全性。

The cylinder bore was divided into sections according to different loads when applying thermal loads on to the inside surface of the cyl inder bore. Finally the regulation of temperature distribution is obtained.

计算缸内传热情况时，只考虑了对流传热；对缸内施加边界载荷时，采取分段加载的方式，最终得到其温度分布规律。

In astrophysics, a white hole is a postulated celestial body that spews out matter, in other words an anti-black hole, or the time reversal of a black hole.

在天体物理学中，白洞是一个假定向外喷吐物质的天体，换句话说就是一个反黑洞，或时间逆向流动的洞。

Parikh and Wilczek further refined and extended the thought of Keski-Vakkuri and Kraus, the radiation was explained as a tunneling process crossing the barrier of horizon, and in literatures the method is called Parikh-Wilczek tunneling method. In our paper, we further studied the effect of Hawking radiation of the apparent horizon of the dynamical spacetime, the FRW universe, and the thermodynamics of the apparent horizon of the dynamical black hole modes, the Vaidya black hole and the McVittie black hole.

更为重要的是，近年来联系于视界热力学一些新的性质被发现：Einstein方程在视界上可以作为热力学第一定律的形式出现；在Friedmann-Robertson-Walker宇宙表观视界上，时空动力学方程(Friedmann方程)也可以写成一个所谓的统一热力学第一定律的形式；局域定义的FRW宇宙表观视界，也存在着在Kodama矢量观测者看来的Hawking辐射效应。

It is possible that houses were outrageously priced one year ago and that they are still priced much higher than the national average.

情况有可能是，这里的房价曾贵得离谱，现在的房价仍然远高于全国的平均指数。

This is a mother's love for her child.

这是母亲对孩子的关爱。