迫弹包装的探讨与实践

中小口径迫弹包装的材料和结构形式直接影响产品的战时适应性，使用方便性和长贮可靠性。针对国内外迫弹包装技术的发展状况和我厂多年的探讨和实践，介绍了采用高密度聚乙烯塑料作为主体材料制造迫弹包装筒的设计过程１、加工工艺和应用情况。     

包装木箱防霉浅谈

本文根据经验介绍包装木箱长霉的原因和生霉情况,以及采用BCM混合酒精液喷洒防霉的简便方法, 目前我国军品包装大多仍使用木箱,而木箱在长贮中长霉是一个老问题。特别是南方山区,空气潮湿、气候温和,长霉更是一种普遍现象,往往导致木箱报废或翻箱除霉     

诌议二十一世纪军品包装的发展策略

本文针对军品包装在军事装备,器材和物资保障中的作用和地位,阐述军品包装的发展需要,明确了军品包装的指导原则,提出了全面发展军品包装的有效措施。     

国防和军队现代化建设背景下军品智能包装的理论研究

目的 介绍军品智能包装的发展趋势和类型,为国防和军队现代化建设背景下军品智能包装的发展提出建议。方法 分析军品智能包装的防护多重性、标准统一性和封存长效性的发展趋势;阐述军品智能包装在储存包装和物流包装2种途径上的具体应用。结果 利用活性包装材料和现代信息技术,能够实现军品包装储存的智能化;利用物联网、大数据、人工智能、区块链等核心数字技术,能够实现军品包装物流的智能化。结论 加快了我军军品智能包装建设军民一体化、绿色生态化的发展道路。     

军品包装标准体系构建研究

界定了军品包装标准体系的相关概念,分析了国内外包装标准体系的建设情况,重点从阐述军品包装标准体系的构建原则、构建依据出发,确定了标准体系的框架和主要内容。     

基于现代军事物流的智能军品包装应用分析

目的介绍智能包装的概念、分类以及应用,为智能包装在军事物流中的应用提供参考,为我军加快军品智能包装的应用提出建议。方法分析军品智能包装为军事物流现代化带来的影响,探索分析军品智能包装在军事物流中的应用场景。结果智能包装作为一种新型包装技术,其未来应用领域非常广阔,军品包装应当向智能化方向发展。结论军品智能包装应当加快开发新技术,创新军品智能包装应用模式,制定军品智能包装相关标准,促进军品智能包装军地结合发展。     

军品包装结合式发展的思考

目的 探索军品包装发展方式,推动军品包装高质量快速发展。方法 通过分析军品包装现状和需求,提出促进军品包装建设与发展的思路和建议。结果 军品包装在国防工业中的地位相对于军事装备而言处于弱势,无论是在业务拓展、资金投入,还是在技术创新等诸多方面均不同程度地落后于装备发展。为扭转军品包装发展滞后的局面,认清军品包装特殊地位及功能要求,探索了军品包装结合式发展的路子,为提升军品包装水平提供了支撑。结论 军品包装技术、包装材料军地通用性强,开展军品包装结合式发展,将会有效提升军品包装技术水平。     

新时代军品包装的发展方向

目的 针对现代战争对装备物资器材的保障需要,系统研究论证新时代军品包装发展方向,为下一步军品包装发展提供借鉴参考.方法 通过需求论证和对比分析,厘清装备(器材)物资保障和现代军事物流建设对军品包装的需求,结合现代战争新样式新特点,按照不同需求、不同领域、不同层次,提出未来一段时期内军品包装的关注重点和发展动向.结果 军品包装要适应新时代军事战略方针,聚焦实战要求,坚持创新驱动,向综合防护、现代军事物流包装、智能化、功能性、绿色方向发展.结论 军品包装与装备(器材)物资效能发挥、战斗力提升息息相关,要紧扣需求、紧贴战场、紧盯前沿,大力推动军品包装新质保障力生成.     

试论军品包装材料“以竹代木”

新型包装材料的开发、利用,已成为整个包装行业发展的必然趋势。从世界化工工业发展情况来看,包装材料势必向着高分子合成材料方向发展,但就我国国情和军队的具体情况而言,高分子合成材料广泛应用于各类包装,特别是高强度的军品包装还有一个过程,需要相当长的时间。因此,在研究军品包装材料时,必须考虑到这个现实。军品包装材料“以竹代木”就是在这个前提下提出来的,它具有十分     

新时期军品包装标准化建设的理性思考

论述了军品包装标准化对军品包装建设工作的重要意义,从保障形态、军品防护性要求、信息技术发展等不同角度分析了军品包装标准化建设的需求,提出加强军品包装标准化建设的基本思路.     

On the spectrum of the electric field integral equation and the convergence of the moment method

Existing convergence estimates for numerical scattering methods based on boundary integral equations are asymptotic in the limit of vanishing discretization length, and break down as the electrical size of the problem grows. In order to analyse the efficiency and accuracy of numerical methods for the large scattering problems of interest in computational electromagnetics, we study the spectrum of the electric field integral equation (EFIE) for an infinite, conducting strip for both the TM (weakly singular kernel) and TE polarizations (hypersingular kernel). Due to the self‐coupling of surface wave modes, the condition number of the discretized integral equation increases as the square root of the electrical size of the strip for both polarizations. From the spectrum of the EFIE, the solution error introduced by discretization of the integral equation can also be estimated. Away from the edge singularities of the solution, the error is second order in the discretization length for low‐order bases with exact integration of matrix elements, and is first order if an approximate quadrature rule is employed. Comparison with numerical results demonstrates the validity of these condition number and solution error estimates. The spectral theory offers insights into the behaviour of numerical methods commonly observed in computational electromagnetics. Copyright © 2001 John Wiley & Sons, Ltd.     

Multi-segment FEA of the human lumbar spine including the heterogeneity of the annulus fibrosus

This study pursues the numerical validation of human lumbar spine segments. By means of the finite element (FE) method, computational analyses are carried out of various load cases. In particular Flexion–Extension, Lateral Bending and Axial Torque are considered. By means of a literature review the underlying constitutive data is verified. In this context, the heterogeneity of the annulus fibrosus, the transversely isotropic stress response of the spinal ligaments and aspects of the FE discretization are particularly emphasized. The numerical results show good agreement with experimental investigations for Extension and Axial Torque for a FE model that accounts for intact human lumbar spine response. In Flexion and Lateral Bending, however, the results of the intact FE-model do not properly account for the experimental data. A good correlation for these load cases can be found by taking disc degeneration into account in the FE-model. This fact shows that tissue degeneration plays a key role in the current validation process and must be accounted for if the lumbar spine specimen is employed for spinal implant evaluation. A degenerated FE-model that represents the stage of degeneration of the specimen and fits the experimental data for all load cases could not be found in this study and warrants further work in this area.The authors are deeply indebted to Centerpulse Orthopedics Ltd., Winterthur, Switzerland (www.zimmer.com) for financial aid and support of this research. Additionally, the authors thank Darrell Goertzen for his work involving the experimental testing.     

基于老年人特征的玩具设计方法研究

文章在分析老年人的生理和心理的特征的基础上,提出了老年人玩具设计的基本原则,并分别从功能、造型、色彩、材质、结构等方面,分别论述了老年人玩具的设计方法,对新兴的玩具设计进行了有益的探索.     

唐三彩包装结构探讨

对唐三彩进行缓冲包装,探讨在选定缓冲包装材料以后,如何根据被包物本身的结构特点,设计包装结构,以达到较好的缓冲包装效果。     

On the alternative to the Weibull function

It is pointed out that the distribution introduced by Neville and Kennedy [Neville DJ, Kennedy JB. An alternative to the Weibull function for some cases. J Mech Des 1991;113:195-9] (for modeling fracture toughness and fracture stress) is contained by at least two known families of distributions. Some elementary statistical properties of these families are discussed. Six data sets on fracture roughness are used to demonstrate that these families are much better models for fracture roughness than the one introduced by Neville [Neville DJ, Kennedy JB. An alternative to the Weibull function for some cases. J Mech Des 1991;113:195-9].     

Detecting the Radiative Decay Mode of the Neutron

Beta decay of the neutron into a proton, electron, and electron antineutrino is occasionally accompanied by the emission of a photon. Despite decades of detailed experimental studies of neutron beta-decay, this rare branch of a fundamental weak decay has never been observed. An experiment to study the radiative beta-decay of the neutron is currently being developed for the NG-6 fundamental physics endstation at the National Institute of Standards and Technology (NIST) Center for Neutron Research (NCNR). The experiment will make use of the existing apparatus for the NIST proton-trap lifetime experiment, which can provide substantial background reduction by providing an electron-proton coincidence trigger. Tests and design of a detector for gamma-rays in the 10 keV to 200 keV range are under development. The need for a large solid-angle gamma-ray detector that can operate in a strong magnetic field and at low temperature has led us to consider scintillating crystals in conjunction with avalanche photodiodes. The motivation and experimental technique will be discussed.     

On the asymmetrical dependence of the threshold pressure of infiltration on the wettability of the porous solid by the infiltrating liquid

A general equation has been derived for the threshold pressure of infiltration of liquids into porous solids. From this equation all the known equations for the threshold pressure can be obtained, using different assumptions on the morphology of the porous solid and on the way how the liquid infiltrates the solid. Particularly, the Young-Laplace equation, the Carman-equation, and the modification of the Carman equation, suggested by White and later by Mortensen and Cornie have been reproduced as particular cases of the general equation. A new particular solution of this general equation is also suggested, taking into account that the original solid/gas interface inside the porous body is not fully replaced by the solid/liquid interface during infiltration, especially for the case of non-wetting liquids. The new, general equation consists of three semi-empirical parameters, which should be found experimentally for a given type of morphology of the porous solid and for the given ratio of the surface tension to the density of the infiltrating liquid metal. The new equation provides a value of the threshold contact angle to be between 65.5° and 90°, depending on the morphology of the porous solid. Consequently, the threshold pressure appears to be an asymmetrical function of the contact angle. Based on the new equation, the practical constancy of the threshold pressure is predicted in the interval of the contact angles between 120° and 180°.     

多媒体艺术在城市形象传播中的应用研究

分析了当今多媒体艺术的概念和特点,论述了多媒体艺术对传播城市形象的积极作用,进而分析了以互联网为标志的信息时代技术与艺术的结合对传播城市形象以及城市历史文化的优越性和必要性,提出了应将历史文化、多媒体技术以及视觉传达理论相结合,在实践道路上探索出一条表现城市形象的最佳形式,这必将对城市对外形象宣传起到重要的推动作用。     

On the comparison of the methods used for the solutions of the governing equation for unsteady unidirectional flows of second grade fluids

In order to solve the governing equation for unsteady unidirectional flows of second grade fluids, the use of the Laplace and the Fourier transform methods are discussed. Three characteristic examples which are unsteady flow between two parallel plates, unsteady pipe flow and unsteady flow over a plane wall are considered. It is found that the solution for unsteady flow in bounded regions obtained by the Laplace and the Fourier transform methods are exactly the same as the case of the unsteady flow of a Newtonian fluid. It is shown that the Laplace transform method for small values of time is useful for flows of Newtonian fluids but it is not convenient for flows in unbounded regions of second grade fluids. Furthermore, it is explained that for some unsteady flows of second grade fluids, the solution obtained by using the Laplace transform does not satisfy the initial condition and therefore the Fourier transform method is used.