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.     

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.     

Information for Contributors

<正>Journal of China Ordnance A comprehensive academic journal sponsored by China Ordnance Society,ispublished quarterly.This journal is a representative of publications of the academic circles specializing chiefly inthe field of ordnance science and technology.Contributions within the above scope all over the world are welcome.     

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...     

现代国防科技英汉字典(27)

STAR Strategic Technologies for the Army of the 21st Century21世纪陆军战略技术STARLITE surveillance targeting and reconnaissance satellite目标监视和侦察卫星TARLOS SAR Target Recognition and Location System目标识别与定位系统STARS software technology for adaptable,reliable systems     

An impact sensitivity assessment method of spacecraft based on virtual exterior wall

The impact sensitivity assessment of spacecraft is to obtain the probability of spacecraft encountering the OD/M(orbital debris or meteoroid), which is a prerequisite for survivability assessment of on-orbit spacecraft. An impact sensitivity assessment method of spacecraft based on virtual exterior wall was proposed to improve the computational efficiency. This method eliminates determination of the outermost surface elements of the spacecraft before generating the debris rays, which are assumed...     

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.     

Optimization of friction stir welding parameters for improved corrosion resistance of AA2219 aluminum alloy joints

The aluminium alloy AA2219(Al—Cu—Mg alloy) is widely used in the fabrication of lightweight structures with high strength-to-weight ratio and good corrosion resistance.Welding is main fabrication method of AA2219 alloy for manufacturing various engineering components.Friction stir welding(FSW) is a recently developed solid state welding process to overcome the problems encountered in fusion welding.This process uses a non-consumable tool to generate frictional heat on the abutting surfaces.The welding parameters,such as tool pin profile,rotational speed,welding speed and axial force,play major role in determining the microstructure and corrosion resistance of welded joint.The main objective of this work is to develop a mathematical model to predict the corrosion resistance of friction stir welded AA2219 aluminium alloy by incorporating FSW process parameters.In this work a central composite design with four factors and five levels has been used to minimize the experimental conditions.Dynamic polarization testing was carried out to determine critical pitting potential in millivolt,which is a criteria for measuring corrosion resistance and the data was used in model.Further the response surface method(RSM) was used to develop the model.The developed mathematical model was optimized using the simulated annealing algorithm optimizing technique to maximize the corrosion resistance of the friction stir welded AA2219 aluminium alloy joints.     

Effects Of Subjective Factors On Second Language Learnig(L2L)

<正>In order to promote the activeness and initiative of learners and allow them to take theirlearning advantages,a teacher should be fully aware of the psychological process and models ofL2L．For no matter how well learners can command a language,their subjective incentives play adecisive role,that is the case particularly for non—Eniglish majors,who are always exposed tocrowded,serious and teacher—centred learning contexts.     

Model Versions and Fast Algorithms for Network Epidemiology

Network epidemiology has become a core framework for investigating the role of human contact patterns in the spreadingof infectious diseases. In network epidemiology, one represents the contact structure as a network of nodes（individuals） connected bylinks（sometimes as a temporal network where the links are not continuously active） and the disease as a compartmental model（whereindividuals are assigned states with respect to the disease and follow certain transition rules between the states）. In this paper, we discussfast algorithms for such simulations and also compare two commonly used versions,one where there is a constant recovery rate（the numberof individuals that stop being infectious per time is proportional to the number of such people）;the other where the duration of the diseaseis constant. The results show that, for most practical purposes, these versions are qualitatively the same.     

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...     

Adaptive Robust Servo Control for Vertical Electric Stabilization System of Tank and Experimental Validation

A tracking stability control problem for the vertical electric stabilization system of moving tank based on adaptive robust servo control is addressed. This paper mainly focuses on two types of possibly fast timevarying but bounded uncertainty within the vertical electric stabilization system: model parameter uncertainty and uncertain nonlinearity. First, the vertical electric stabilization system is constructed as an uncertain nonlinear dynamic system that can reflect the practical mechanics tr...     

The Two Techniques of O. Henry''''s

O.Henry is the founder of American modern short story, What makes his stories enjoy most popularity is his own styles——(1)Reasonable artistic exaggreration. (2)Unexpected ending. In this article I emphatically comment its value in the two stories: The Romance of a Busy Broker and The Last Leaf. Up to Now there is still much in Henry's method that we can make use of beneficially.     

O.Henry and The Gift of The Magi

<正>O.Henry is the pseudonym of william Sydney Porter,a most popular American Short-story writer at the turn of the century.He Was born in Greenboro,North Carolina,in 1862,went to school there and wotked for five years in his uncle's drugstore.At twenty he movedto Texas,where he founded a shoft-lived humorous weekly named the Rolling Stone andwrote for a Houston newspaper.He also worked as a teller in a bank.Unfortunately accused     

Defence Technology Aims and Scope

<正>Defence Technology(ISSN:2214-9147).sponsored by China Ordnance Society,is published quarterly and aims to become one of the well-known comprehensive journals in the world,which reports on the breakthroughs in defence technology by building up an international academic exchange platform for the defence technology related research.It publishes original research papers having direct bearing on defence,with a balanced coverage on analytical,experimental,numerical simulation and applied investigations.It covers various disciplines of science,technology and engineering.     

Aims and Scope

<正>Defence Technology(ISSN:2214-9147),sponsored by China Ordnance Society,is published quarterly and aims to become one of the well-known comprehensive journals in the world,which reports on the breakthroughs in defence technology by building up an international academic exchange platform for the defence technology related research.It publishes original research papers having direct bearing on defence,with a balanced coverage on analytical,experimental,numerical simulation and applied investigations.It covers various disciplines of science,technology and engineering.     

Nano-silica modified lightweight and high-toughness carbon fiber/phenolic ablator with excellent thermal insulation and ablation performance

Lightweight and high-toughness carbon fiber/phenolic ablator(CFPA) is required as the Thermal Protection System(TPS) material of aerospace vehicles for next-generation space missions. To improve the ablative properties, silica sol with good particle size distribution prepared using tetramethoxysilane(TMOS) was blended with natural rubber latex and deposited onto carbon fiber felt, which was then integrated with phenolic aerogel matrix, introducing nano-silica into the framework of CFPA. The modi...     

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     

Machine learning for predicting the outcome of terminal ballistics events

Machine learning(ML) is well suited for the prediction of high-complexity, high-dimensional problems such as those encountered in terminal ballistics. We evaluate the performance of four popular ML-based regression models, extreme gradient boosting(XGBoost), artificial neural network(ANN), support vector regression(SVR), and Gaussian process regression(GP), on two common terminal ballistics’ problems:(a)predicting the V50ballistic limit of monolithic metallic armour impacted by small and medium ...     

Interfacial reinforcement of core-shell HMX@energetic polymer composites featuring enhanced thermal and safety performance

The weak interface interaction and solid-solid phase transition have long been a conundrum for 1,3,5,7-tetranitro-1,3,5,7-tetraazacyclooctane(HMX)-based polymer-bonded explosives(PBX). A two-step strategy that involves the pretreatment of HMX to endow —OH groups on the surface via polyalcohol bonding agent modification and in situ coating with nitrate ester-containing polymer, was proposed to address the problem. Two types of energetic polyether—glycidyl azide polymer(GAP) and nitrate modified G...