Recent progress in developing ballistic and anti-impact materials:Nanotechnology and main approaches

With increasing international and civilian conflicts, developing advanced body armor has become an emerging field in academia and industry. Nanotechnology, by means of, incorporating nanomaterials, is considered a highly effective technique to achieve this goal. It has been widely studied in defense applications owing to high strength-to-weight ratios and excellent energy absorption capability of nanomaterials. Hence, this review encompasses the latest application of nanotechnology involving nan...     

Shielding and corrosion properties of the Alloy 709 as canister material for spent nuclear fuel dry casks

The shielding and corrosion properties of the Alloy 709 advanced austenitic stainless steel have been investigated as a candidate canister material in spent fuel dry casks. The results revealed that the experimental and computational data of the linear and mass attenuation coefficients of the alloy are in good agreement, in which the attenuation coefficient values decreased with increasing photon energy.Alloy 709 was shown to exhibit the highest linear attenuation coefficient against gamma rays ...     

Natural vibration of cantilever porous twisted plate with variable thickness in different directions

In this paper, the blade is assumed to be a rotating variable thickness cantilever twisted plate structure,and the natural vibrations of variable thickness cantilever twisted plate made of metal porous material are studied. It is assumed that the thickness of the plate changes along spanwise direction and chordwise direction, respectively, and it changes in both directions. The classical thin shell theory, the first and second fundamental forms of surface and von Karman geometric relationship ar...     

Ballistic impact response of flexible and rigid UHMWPE textile composites: Experiments and simulations

This study elaborates on the effects of matrix rigidity on the high-velocity impact behaviour of UHMWPE textile composites using experimental and numerical methods. Textile composite samples were manufactured of a plain-weave fabric(comprising Spectra? 1000 fibres) and four different matrix materials.High-velocity impact tests were conducted by launching a spherical steel projectile to strike on the prepared samples via a gas gun. The experimental results showed that the textile composites gradu...     

Effect of interactions of two holes on tensile behavior of patch repaired carbon/epoxy woven laminates

The conventional case of patch repair involves bonding a patch over single damage/hole in the laminate.This work investigates the effect of interaction of two holes on the tensile behavior patch repaired carbon epoxy woven laminates. The specimens of [0°/45°/45°/0°] laminates were repaired with adhesively bonded two-ply [45°]2external patches. Three different cases of drilled specimens were produced with different hole arrangements viz. specimens with single central hole(SH), with two holes alig...     

黑海的秘密

42黑海的秘密@贝尔热 @德.杜埃~~     

用于核动力攻击潜艇的全综合容错(FIFT)指挥、控制、通信和测量(C~3I)系统

目前,美国实用的潜艇用电气和电子系统设计实际上是彼此独立的。这样的实践限制了利用过去几十年所获得的技术进步的优点。为了使潜艇平台的能力最大化,必须综合传统的、具有类似处理和通信要求的各个系统。本文研究和分析一种可能的称之为FIFT C~3I系统的实现,该系统综合支援潜艇任务的所有主要的电气和电子系统。这样的系统必须有容错能力,以致于使综合系统的可靠性、可用性和安全性等于或优于要替换的现有系统。这种方法的优点很多且可用现有技术和部件实现。     

中国国防预算评析

长期以来,中国 的国防预算,在一些人心目中,似乎“蒙上 了一层神秘的面纱”,众说纷纭,各执一是。 近几年西方一些学者和官员认为,中国存在 大量“隐形”国防费,国家公布的国防预算只是实际国防费的一部分;特别是一些别有用心的人散布,中国的国防费增长过多、过快,已对东亚和东南亚构成了威胁。国内也有人认为,国防费增长多了一些,影响了中国社会经济的均衡发展,如此等等。在新的年度一开始,中国的国防预算,又一次成为国内外各界人士关心的热门话题之一。中国国防预算的真相如何,本文刊登了中国军事经济研究中心副总干事库桂生教授的评析文章,会给您一个简单明了的答案。     

国防经济应用研究领域的又一部创新力作——读《中国裁军与国防资源配置研究》

《中国裁军与国防资源配置研究》是朱庆林教授主责的1996年度国家社科基金军事学项目的最终成果,也是我国国防经济学科逐步走向成熟并在应用研究领域取得的创新性成果之一。关于裁军的著作已经出版了许多,但将裁军与国防资源配置结     

开拓国防经济研究的新思路——《中国军队福利制度研究》评介

北京大学经济学博士后、后勤指挥学院教授、博士生导师郝万禄同志所著的《中国军队福利制度研究》一书,已于去年底由国防大学出版社出版,这是我国学术界运用现代经济学方法研究国防经济领域现实问题的不可多得的理论专著。作者站在国内外学术研究的