现代国防科技英汉字典(22)

O&M operation and maintenance作战与维护O&S operation and support 作战与支持OASA(RDA) Office of the Assistant Sec-retary of the Army (Research, Develop-ment and Acquisition)负责研发与情报的陆军助理部长办公室OBIDS on-board integrated diagnosticsystems在板集成诊断系统     

《孔学堂》杂志、孔学堂书局招聘启事

正Envisage the Dynamics of chinese culture and Welcome the Harmony in Diversified Civillzations.立足当代弘扬中华文化面向世界对话多元文明《孔学堂》杂志(中国思想文化评论)是国家新闻出版广电总局新批准创办的公开发行的期刊(中英文、双月刊,国内统一刊号为CN52-5035/C),宗旨是:立足当代弘扬中华文化,面向世界对话多元文明。孔学堂书局是国家新闻出版广电总局新批准成立的出版单位,主要出版范围是:发掘和阐发中华优秀传统文化的学术著作、大众文化类图书等。因工作和发展需要,面     

Influence of Accelerated Aging on Detonation Performance of Explosives

To understand the aging effects on detonation performances of explosives,an accelerated aging mechanism and effect of explosives were analyzed.Based on the thermo-gravimetric(TG) curves of explosives under the heat rate of 5,10 and 20 K·min-1,the thermal decomposition activation energy,pre-exponential factor,mechanism function and kinetic equation of the explosives were calculated by Ozawa's equation and decomposition extents.Then,according to the derived kinetic equation,the density,composition and heat of formation of GI-1,PBX-1 and PBX-2 explosive in different decomposition extents were calculated at accelerated aging temperatures of 70 ℃ and 75 ℃,respectively.Furthermore,the detonation parameters of GI-1,PBX-1 and PBX-2 explosives were found out by means of VLWR code.The results show that after accelerated aging,the density are decrease,the detonation velocity and pressure are all decreased slightly.     

《孔学堂》杂志、孔学堂书局约稿启事

正Envisage the Dynamics of chinese culture and Welcome the Harmony in Diversified Civillzations.立足当代弘扬中华文化面向世界对话多元文明为落实习近平等中央领导同志弘扬中华优秀传统文化,对中华优秀传统文化进行普适性传播、创造性转化、创新性发展的重要指示精神,最近,国家新闻出版广电总局批准贵州省创办《孔学堂》杂志、设立孔学堂书局。《孔学堂》杂志和孔学堂书局办刊、立社宗旨为"立足当代弘扬中华文化,面向世界对话多元文明",将同时于2014年a月1e在由国家新闻出版广电总局和贵州省人民政府联合主办的第二十四届全国图书交易博览会上正式创刊、挂牌。     

Optimal trajectory and heat load analysis of different shape lifting reentry vehicles for medium range application

The objective of the paper is to compute the optimal burn-out conditions and control requirements that would result in maximum down-range/cross-range performance of a waverider type hypersonic boost-glide(HBG) vehicle within the medium and intermediate ranges,and compare its performance with the performances of wing-body and lifting-body vehicles vis-a-vis the g-load and the integrated heat load experienced by vehicles for the medium-sized launch vehicle under study.Trajectory optimization studies were carried out by considering the heat rate and dynamic pressure constraints.The trajectory optimization problem is modeled as a nonlinear,multiphase,constraint optimal control problem and is solved using a hp-adaptive pseudospectral method.Detail modeling aspects of mass,aerodynamics and aerothermodynamics for the launch and glide vehicles have been discussed.It was found that the optimal burn-out angles for waverider and wing-body configurations are approximately 5° and 14.8°,respectively,for maximum down-range performance under the constraint heat rate environment.The down-range and cross-range performance of HBG waverider configuration is nearly 1.3 and 2 times that of wing-body configuration respectively.The integrated heat load experienced by the HBG waverider was found to be approximately an order of magnitude higher than that of a lifting-body configuration and 5 times that of a wing-body configuration.The footprints and corresponding heat loads and control requirements for the three types of glide vehicles are discussed for the medium range launch vehicle under consideration.     

Study on Aging Precipitation Characteristic of High Strength Al-Zn-Mg-Cu Alloy

The precipitation of MgZn2 phase in aging process of Al-Zn-Mg-Cu alloy forging was characterized qualitatively after transmission electron microscope(TEM)observation,X-ray diffraction phase analysis and the exact measure of lattice parameter.And,the precipitation of the second-phase in aging process was simulated after test the resistivity of the alloy in a continuous heating process and delayed time processing.The results show that when heating in the same rate,the alloy resistivity increases with temperature first,a mutation point appears at 110℃,and the resistivity reaches its peak at 120℃.Then,the resistivity decreases and achieves a minimum at about 170℃.Afterwards,it increases again.The change of resistivity results from a combined effect of the temperature and phase transformation.The volume precipitation of η' phase dominates at about 120℃,and the resistivity of forgings decreases accordingly.When the specimen cools in a furnace at 240℃,the phase transformation finishes basically and the alloy content of Al-matix keeps stable,thus,the alloy resistivity depends on the temperature only.It decreases with temperature and time since the end of precipitation.The higher the temperature is,the bigger it will be.With a big descending rate of the resistivity curve,the time to reach the stable value becomes shorter.     

Tuning the particle size and morphology of high energetic material nanocrystals

Morphology controlled synthesis of nanoparticles of powerful high energetic compounds(HECs) such as l,3,5-trinitro-l,3,5-triazinane(RDX) and 1,3,5,7-tetranitro-l,3,5,7-tetrazocane(HMX) were achieved by a simple solvent—antisolvent interaction(SAI) method at 70 ℃.The effects of different solvents on particle size and morphology of the prepared nano-HECs were studied systematically.Particle size and morphology of the nano-HECs was characterized using field emission scanning electron microscopy(FE-SEM) imaging.X-ray diffraction(XRD) and Fourier transform infrared(FTIR) spectroscopy studies revealed that RDX and HMX were precipitated in their most stable polymorphic forms,i.e.a and P,respectively.Thermogravimetric analysis coupled with differential scanning calorimetry(TGA-DSC) studies showed that the thermal response of the nanoparticles was similar to the respective raw-HECs.HEC nanoparticles with spherical and rod shaped morphology were observed under different solvent conditions.The mean particle size also varied considerably with the use of different solvents.     

The Essay:A Dintinctive Genre of Writing

<正>There are many forms of literature such as fiction,autobiography and biogra-phy ,Poetry,drama and essty.The essay is one of all the best and finest forms of lit-erature.It is a dlstlnctive style of writing.The essay is the name given to a short pro-se work on a limited topic.Essays take many forms,a famillar narraeive account of     

Quaternion-Based Adaptive Trajectory Tracking Control of a Rotor-Missile with Unknown Parameters Identification

This paper investigates the adaptive trajectory tracking control problem and the unknown parameter identification problem of a class of rotor-missiles with parametric system uncertainties. First, considering the uncertainty of structural and aerodynamic parameters, the six-degree-of-freedom(6Do F) nonlinear equations describing the position and attitude dynamics of the rotor-missile are established, respectively,in the inertial and body-fixed reference frames. Next, a hierarchical adaptive traje...     

An Aid to Adults'learning English Words

<正>With the implementation of the policy of oponing to the outside,more and more people inChina have come to realize the importance of learnin and mastering a foreign 1anguage,English in particular,as an instrument of communicating with people from other countriesand.more often,of seeking for information contained in myriads of foreing publications soas to keep themselves posted in and keep up with the latest advences in the world.     

Quantitative Analysis of Components in OC-CS Sprays by High Performance Liquid Chromatography with Double Wavelength UV Detection

The method of reversed-phase high performance liquid chromatography was established for the determination of effective components in OC-CS spray using double wavelength UV detection.The method was utilized under following conditions:a column of Kromasil C18(250 mm × 4.6 mm,5 μm),mobile phase consisting of methanol/water(80 /20) at a flow rate of 0.8 mL/min,column temperature of 25 ℃,and the UV detection at 227 nm and 300 nm.Three key components in OC-CS spray could be distinguished clearly,including o-chlorobenzalmalononitrile(CS),oleoresin capsicum(OC) and dihydrocapsaicin(DC).This method has the advantages of fast,simple and satisfactory linear relationship between UV absorption and concentration.It may be considered to turn into a standard method for detection of related components in the spray.     

Editorial

<正>Joining of materials is indeed an important aspect for both designers and fabricators.The reasons for joining are functional,structural and cost reduction.No other technique is as widely used as welding to join materials efficiently and add value to their products.Joining of materials goes beyond     

The effect of Ti and Zr content on the structure,mechanics and energy-release characteristics of Ti—Zr—Ta alloys

Energetic structural materials(ESMs) are a new type of structural materials with bearing and damage characteristics.In this work the microstructure,mechanical properties and energy release characteristics of multi-element Ti-Zr-Ta alloys with good casting performance were studied.The microstructure of the Ti_xZrTa alloys gradually change from BCC+HCP to single BCC structure with the increase of Ti.While the Ti₂Zr_yTa alloys was still uniform and single BCC structur...     

Al/Hf ratio-dependent mechanisms of microstructure and mechanical property of nearly fully dense Al—Hf reactive material

This study proposed three types of Al—Hf reactive materials with particle size ratios(a), which were almost completely dense(porosity of <5.40%) owing to their preparation using hot-pressing technology.Microstructure characteristics and phase composition were analyzed, and the influence of particle size ratios on dynamic mechanical behavior and damage mechanism were investigated. The prepared sample with a = 0.1 exhibited continuous wrapping of the Hf phase by the Al phase. Hf—Hf contact(cont...     

当代军语快译通

Area search——visual reconnaissance of limited or defined areas.地域侦查在规定或指定地域进行的目视侦查。Armament delivery recording——motion picture,still photography,an video recordings show-ing the delivery and impact of ordnance.This differsfrom reconnaissance imagery in that it records the act of deliv-ery and impact andnormally is done by the weapon sys-tem delivery the ordnance.Armament delivery recording is used primarily for evaluating strike effectiveness and for combat crew trainin…     

Ballistic performances of the hourglass lattice sandwich structures under high-velocity fragments

In this paper, the numerical simulation method is used to study the ballistic performances of hourglass lattice sandwich structures with the same mass under the vertical incidence of fragments. Attention is paid to elucidating the influences of rod cross-section dimensions, structure height, structure layer, and rod inclination angle on the deformation mode, ballistic performances, and ability to change the ballistic direction of fragments. The results show that the ballistic performances of hou...     

Propagation Properties of Shock Waves in Polyurethane Foam based on Atomistic Simulations

Porous materials are widely used in the field of protection because of their excellent energy absorption characteristics. In this work, a series of polyurethane microscopic models are established and the effect of porosity on the shock waves is studied with classical molecular dynamics simulations. Firstly, shock Hugoniot relations for different porosities are obtained, which compare well with the experimental data.The pores collapse and form local stress wave, which results in the complex multi...     

H_∞-Mixed Sensitivity Design of Roll Channel of Bank-to-Turn Autopilot for Small Diameter Bomb

According to requirements of the bank-to-turn (BTT) control for a small diameter bomb (SDB), the robust design problem for the roll autopilot was studied by H∞-mixed sensitivity control method. A roll channel dynamics model was established. Considering the couple between the yaw and roll channel as uncertain disturbance, the roll autopilot was designed using dual-loop scheme which takes a linear quadratic regulator (LQR) as inner-loop, to ensure the control effect of the certain part in model, and an H∞-mixed sensitivity control as outer-loop, to restrain coupling disturbance and strengthen the system's robust performance. The dynamic tracking performance and the robustness for the parameter disturbance of the roll controller were analyzed. The simulated results show that the roll control system functions better and robustly.     

Shock Raman spectra and structural transformation of powdered TKX-50 by the plate impact experiments combined with real-time Raman detection

As an energetic material of great interest, the work capacity of dihydroxylammonium 5,5’-bistetrazole-1,1’-diolate(TKX-50) has been questioned recently. Although some research groups have explored the reasons for the low working ability of TKX-50, the plane impact experiment on powdered TKX-50 is obviously closer to the practical application, and the conclusions based on this are more guiding. Hence,we performed shock Hugoniot measurements of powdered TKX-50 between 5.65 and 16.29 GPa. The plane...     

Information for Contributors

<正>Journal of China Ordnance A comprehensive academic journal sponsored by China Ordnance Society, is published quarterly. This journal is a representative of publications of the academic circles specializing chiefly in the field of ordnance science and technology.