弹道的

In this paper, by developing a transfer method, we study theoretically transport properties of 2DEGs through antiparallel magnetic-electric barrier structures.

本文中，我们发展了转移矩阵方法研究反平行磁电垒结构中二维电子气体的弹道输运特性，得到了弹道隧穿及共振分裂的一般性规律。

Objective:To probe into the application of evidencebased nursing for patients accepting percutaneous nephrolithotomy air pressure ballistic curve lithotripsy in prevention of body position complications.

导读：探讨循证护理在预防经皮肾镜气压弹道碎石术体位并发症中的应用。对80例肾结石病人行经皮肾镜气压弹道碎石术进行预防体位并发症的循证护理。

The first half of the data is used for aerodynamic coefficients modeling, and the second half is used for verification of the resulting model based on pre-estimation of ballistic curve, the results indicate the wavelet network model of aerodynamic coefficients has generalization ability and applicability.

最后，通过建立某导弹飞行器六自由度动力学模型并进行仿真，得到样本数据，将其中一半数据用于小波网络气动力系数建模，模型参数辨识完成后，基于弹道重构原理将模型代入动力学系统进行弹道预测，将预测结果与另一部分样本数据进行比较以检验模型的推广能力，结果表明所建模型具有很好的推广能力和适用性。

Methods: A total of 80 renal calculus patients undergoing percutaneous nephrolithotomy air pressure ballistic curve lithotripsy were carried out evidence-based nursing to prevent postoperative body position complications.

探讨循证护理在预防经皮肾镜气压弹道碎石术体位并发症中的应用。对80例肾结石病人行经皮肾镜气压弹道碎石术进行预防体位并发症的循证护理。

A physical model of the process of two propulsions is proposed, and a mathematical mode of interior ballistics of two propulsions is also established based on a 12.7mm test gun, while general effects of various parameters upon maximum pressure and muzzle velocity are revealed.

提出了二次发射过程的物理模型，并以12.7mm弹道枪为对象建立了膛内二次发射内弹道数学模型，分析了参数变化对膛压和初速的影响规律。

Ballistic performance's simulative emulation and validation test of a certain projectile shows that the structure of projectile is fit for the needs of exterior ballistic stability, the data jumpiness of dispersion is within the range of normal, the resistance curve's rebounding phenomena is independent of the structure of projectile.

文中通过对某型弹丸外弹道特性的相似仿真计算和相似模拟验证试验结果表明，弹丸在结构满足外弹道飞行稳定要求的前提下，最大地面射程密集度数据跳动属正常散布，阻力曲线"反弹"现象与弹丸结构无关。

The principle and trajectory feature of the upper limit control are analyzed,and the rule of upper limit control is presented.Moreover,the depth trajectories for torpedo to enter into the upper limit depth by three control modes during pursuing target are calculated and simulated.

本文分析了上限控制的原理和弹道特点，给出了上限控制基本规律，对鱼雷以跟踪目标进入上限、跟踪保持结束进入上限以及在上限上方跟踪保持结束等3种不同控制方式进入上限的深度弹道进行了数学仿真计算。

TCS provides the ballistic rocket with post-launch trajectory correction via a command signal sent from the launcher or from the Daman radar.

该装置通过来自多管火箭炮或&达曼&雷达的控制信号对弹道火箭弹提供发射后的弹道修正。

The similarity of interior ballistic performance variations of wearing and erosional gun is researched by the similar-analysis based on the zero-dimensional model and two-phase flow model of interior ballistic.

在内弹道零维模型及两相流模型相似分析的基础上，对烧蚀磨损火炮内弹道性能变化的相似性也进行了研究。

The paper points out the way of applying the functions of GPS position and measure and the functions of DSP fast signal process and precise timing in GPS Trajectory Correction Fuze to achieve mechanical and electrical safety system and fuzing control.

提出了在GPS弹道修正引信中应用GPS定位功能和DSP快速信号处理、高精度定时功能等较成熟的机械电子技术来实现GPS弹道修正引信机电安全系统和引信起爆的控制。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。