利用 TLI 进行无连接方式应用开发

ＴＬＩ是ＩＳＯ－ＯＳＩ模型的传输层的一个编程界面,支持网络中两个用户进程间的数据传送。ＴＬＩ为应用开发提供了两种服务方式：连接方式和无连接方式。前者适宜于要求较大数据量,面向数据流交互的应用程序;后者适合于含有短小快速请求／响应交互的应用程序。本文详细讨论了ＴＬＩ的无连接方式服务和在应用开发过程中必须解决的几个问题。     

潜艇作战系统体系结构与可靠性研究

结合工程实践,对不同连接模式下潜艇作战系统体系结构与可靠性作了较深入的探讨,对高可靠性系统的特征及关键技术作了较全面论述     

利用PB 6.0实现数据库动态查询

在分析关系数据库SQL查询语言原理的基础上,通过一个具体的例子介绍了如何利用PB6.0实现数据库动态查询.     

兵团文化对兵团大学生价值观的影响及对策

兵团文化是兵团精神的集中反映,是兵团在长期历史发展过程中所形成的独特、稳固、持久而强烈的兵团精神的体现。兵团大学生作为兵团年轻一代的建设者和接班人,其价值观受到兵团文化的影响,在一定程度上对兵团文化的继承和创新起着举足轻重的作用。文章旨在调查兵团文化对兵团大学生价值观的影响,并为更好地弘扬兵团文化在大学生价值观教育中的作用提出相应对策。     

Influence of a liquid-filled compartment structure on the incoming shaped charge jet stability

Liquid-filled compartment structure consists of a bulk steel plate with matrix blind holes which are filled with liquid and a steel front plate to seal up the liquid with rings and bolts.The liquid-filled compart-ment structure can resist the shaped charge warhead effectively.This paper presents experimental and theoretical investigations of the penetration ability of the residual shaped charge jet emerging from the liquid-filled compartment structure after the penetration process at different impact angles.On the basis of shock wave propagation theory,the influence of the liquid-filled compartment structure on jet sta-bility is analysed.The interferences of the liquid backflow caused by a reflected shock wave and a back plate on jet stability under different impact angles are also examined.In addition,the range of the disturbed velocity segments of the jet at different impact angles and the penetration ability of the re-sidual jet are obtained.A theoretical model is validated against the experimental penetration depths.     

An experiment evaluating how the tiny mass eccentricities in spin-stabilized projectiles affect the position of impact points

This study investigates and quantifies some possible sources affecting the position of impact points of small caliber spin-stabilized projectiles (such as 12.7 mm bullets). A comparative experiment utilizing the control variable method was designed to figure out the influence of tiny eccentric centroids on the projectiles. The study critically analyzes data obtained from characteristic parameter measurements and precision trials. It also combines Sobol's algorithm with an artificial intelligence algorithm—Adaptive Neuro-Fuzzy Inference Systems (ANFIS)—in order to conduct global sensitivity analysis and determine which parameters were most influential. The results indicate that the impact points of projectiles with an entry angle of 0° deflected to the left to that of projectiles with an entry angle of 90°. The difference of the mean coordinates of impact points was about 12.61 cm at a target range of 200 m. Variance analysis indicated that the entry angle — i.e. the initial position of mass eccentricity — had a notable influence. After global sensitivity analysis, the significance of the effect of mass eccentricity was confirmed again and the most influential factors were determined to be the axial moment and transverse moment of inertia (Izz Iyy), the mass of a projectile (m), the distance between nose and center of mass along the symmetry axis for a projectile (Lm), and the eccentric distance of the centroid (Lr). The results imply that the control scheme by means of modifying mass center (moving mass or mass eccentricity) is promising for designing small-caliber spin-stabilized projectiles.     

Mitigation effects on the reflected overpressure of blast shock with water surrounding an explosive in a confined space

The mitigation of blast shock with water has broad application prospects. Understanding the mitigation effects on the reflected overpressure of the explosion shock with water surrounding an explosive in a confined space is of great significance for military explosives safety applications. To estimate the effects of the parameters on the reflected overpressure of blasted shock wave, a series of experiments were carried out in confined containers with spherical explosives immersed in a certain thickness of water, and numerical simulations were conducted to explore the corresponding mechanisms. The results reveal that the reflected overpressure is abnormally aggravated at a small scaled distance. This aggravation is due to the high impulse of the bulk accelerated water shell converted from the explosion. With increasing scaled distance, the energy will be gradually dissipated. The mitigation effects will appear with the dispersed water phase front impacting at a larger scaled distance, except in the case of a dense water phase state. A critical scaled distance range of 0.7—0.8 m/kg1/3 for effective mitigation was found. It is suggested that the scaled distance of space walls should be larger than the critical value for a certain water-to-explosive weight ratio range (5—20).     

南京政治学院"纪念中国共产党成立80周年理论研讨会"综述

“七一”前夕 ,为庆祝中国共产党八十华诞 ,南京政治学院在中国共产党的诞生地———上海 ,召开纪念中国共产党成立八十周年理论研讨会 ,作为献给党的生日礼物。来自教学、科研战线的 4 0多位与会代表参观了党的“一大”会址 ,回顾了党的光辉历程 ,以江泽民“三个代表”重要思想为指导 ,联系国际、国内形势的变化 ,对新时期党的建设的一系列重大问题进行了广泛的交流与讨论。一、回顾 80年党的光辉历程 ,总结党的建设的历史经验一些代表在回顾党的历史的基础上 ,提出中国共产党自 192 1年成立以来 ,有两次大发展的时期 ,一次是从 1935年遵义…     

陀螺马达驱动信号的数字化测量与失真度分析

简要介绍陀螺马达驱动信号的数字化测量方法及失真度分析的数学原理 ,给出了一个实例 .实践证明 ,该方法电路结构简单、参数测量准确、程序编写方便 ,具有较好的实时性能 .     

On the reduction of total‐cost and average‐cost MDPs to discounted MDPs

This article provides conditions under which total‐cost and average‐cost Markov decision processes (MDPs) can be reduced to discounted ones. Results are given for transient total‐cost MDPs with transition rates whose values may be greater than one, as well as for average‐cost MDPs with transition probabilities satisfying the condition that there is a state such that the expected time to reach it is uniformly bounded for all initial states and stationary policies. In particular, these reductions imply sufficient conditions for the validity of optimality equations and the existence of stationary optimal policies for MDPs with undiscounted total cost and average‐cost criteria. When the state and action sets are finite, these reductions lead to linear programming formulations and complexity estimates for MDPs under the aforementioned criteria.© 2017 Wiley Periodicals, Inc. Naval Research Logistics 66:38–56, 2019