美国武器采购实施军民规范和运作方式并轨的效果

实施军民规范和运作方式并轨,逐步推进军民一体化,是美国武器采办改革的重大举措之一。本文介绍美国防部有关民用运作方式的定义,以及在武器采办试点项目中采用民用规范与运作方式的类型和军民规范与运作方式并轨的效果。     

飞机一体化设计技术

本文论述了飞机一体化设计的技术概念和原理,以及对航空技术和产品发展的影响,介绍了几个航空强国飞机一体化设计的技术发展概况,指出需要重点发展的几项关键技术。     

我国空难赔偿法律制度的若干问题

已推行了70多年的《华沙公约》体系已经不适应时代的要求,需要进行修改。目前,我国只有国际航线按《华沙公约》体系赔偿,国内航线则适用国内相关法律法规。国际公约与国内法的并轨,任重而道远。国内航空运输,按照国内法的相关规定进行赔偿。国内航线的赔付标准需要提高。我国国内航线的中外旅客赔偿标准原则上一致。国际航空运输的赔偿金额应以客票上的“旅客须知”或“运输条件”所援引的法律规定为准。如果涉及侵权,不仅赔偿数额大,理赔过程也相当复杂。对平等生命的赔偿金额的计算结果也有时会有所差异。保险意识显示了一个人的责任心,显示了他对生命的珍视和对家人的关爱。     

军工产品及配套产品计量管理工作探讨

介绍了国防军工计量概况,分析了军工产品及配套产品计量与国防科技工业计量的差异及所面临的形势,提出了新时期加强军工产品及配套产品计量管理的几点建议。     

论中国国际航空集团投资中心功能的建立和完善

组建大型企业集团,是我国经济适应市场经济体制和与国际经济环境并轨而采取的具有战略意义的举措,其发展方向是促进企业尤其是国有大型企业组织结构的调整,使之形成群体优势和综合功能,成为我国参加世界经济领域竞争的主力,最终形成跨行业、跨部门、跨地区多角化经营的现代化国际型企业集团。以中国国际航空公司为核心企业的中国国际航空集团是国家选择为第一批55个试点企     

老龄飞机结构广布疲劳损伤研究的关键问题

老龄飞机的广布疲劳损伤问题已经成为学术界和工业界关注的问题之一。从飞机机身蒙皮连接的细节应力分析、裂纹形成、裂纹扩展、剩余强度等几个方面对广布疲劳损伤进行了研究,并对当前需要研究的问题进行了分析。     

浅谈民用飞机驾驶员座椅的设计

首先对民用飞机驾驶员座椅的构成进行了描述，随后介绍了民机驾驶员座椅设计时，需要重点考虑的几个问题，主要包括座椅适航要求，可靠性、可维护性要求以及座椅舒适性要求等等，并对其中需要注意的事项进存了说明。     

行星齿轮传动动力学特性研究进展

行星齿轮传动由于结构紧凑、承载能力强等优点而广泛应用在各个工业领域。振动和噪声是行星齿轮传动的主要问题。本文从动力学模型、自由振动、响应求解、均载及振动抑制等几个方面对国内外行星齿轮传动系统弹性动力学及相关研究进行了综述。介绍了行星齿轮传动弹性动力学研究中常用的纯扭转振动模型、横向—回转耦合振动模型以及有限元模型,对三种常用的响应求解方法进行了分析和评述。最后指出了需要进一步研究的几个问题。      

反舰导弹的隐身技术

通过对而向新世纪反舰导弹作战需求的分析,介绍了红外隐身技术和雷达隐身技术在反舰导弹中的应用,并指出隐身技术应用于反舰导弹需要解决的几个问题,为其发展提供参考.     

飞标规章管理系统的开发与应用

民航飞行标准规章是民航安全管理的基础之一,具有数量大、种类多的特点,目前共计20多部,这些飞行标准运行规章相互独立却又密切关联,同时还包含相关配套文件,如咨询通告、管理程序、管理文件等。员工需要对规章条款进行准确定位和正确理解,因此飞行标准规章日常管理工作难度较大。     

Future of Venus Research and Exploration

Despite the tremendous progress that has been made since the publication of the Venus II book in 1997, many fundamental questions remain concerning Venus’ history, evolution and current geologic and atmospheric processes. The international science community has taken several approaches to prioritizing these questions, either through formal processes like the Planetary Decadal Survey in the United States and the Cosmic Vision in Europe, or informally through science definition teams utilized by Japan, Russia, and India. These questions are left to future investigators to address through a broad range of research approaches that include Earth-based observations, laboratory and modeling studies that are based on existing data, and new space flight missions. Many of the highest priority questions for Venus can be answered with new measurements acquired by orbiting or in situ missions that use current technologies, and several plausible implementation concepts have been studied and proposed for flight. However, observations needed to address some science questions pose substantial technological challenges, for example, long term survival on the surface of Venus and missions that require surface or controlled aerial mobility. Missions enabled by investments in these technologies will open the door to completely new ways of exploring Venus to provide unique insights into Venus’s past and the processes at work today.     

基于PowerPC处理器的嵌入式系统电源设计与实现

PowerPC处理器以其多样化功能和优异的性能得到各领域广泛应用。基于此类处理器的嵌入式系统设计将会涉及到许多特殊问题,嵌入式处理系统的电源电路设计就是其中之一。以MPC755为例分析了PowerPC处理器的供电要求和单板计算机的整体电路功能,开展了基于多种电源转换芯片的供电设计,解决了PowerPC处理器嵌入式单板计算机的供电问题。     

企业绩效考核中存在的问题与对策

从绩效考核系统的诸要素和环节分析绩效考核中出现各种问题的原因，认为我国企业绩效考核目前存在的问题主要是在理念层面，即在绩效考核指标制订、考核执行及考核结果应用中脱离了绩效考核的根本目的，变成了为了考核而考核；同时，在技术层面，业务素质不高导致绩效考核不能得到落实。无论是理念层面，还是技术层面，都受企业文化的制约，因此企业文化是否健康，对绩效考核能否有效发挥作用至关重要。     

Comparative Study of the Dynamics of the Outer Planets

The two classes of outer planets, Gas Giants and Ice Giants, have distinctly different global circulation patterns and internal structure. Ongoing ground-based observations of the Ice Giants provide clues to better understanding and Galileo and Cassini data will generate constraints for Gas Giant modeling. The composition below the cloud levels, the depths to which the winds penetrate and the processes that sustain the zonal winds and weather systems are not understood. Basic questions concerning the structure, composition and atmospheric dynamics that are sustained on the four giants could be answered by a combination of orbiters and probes. Future missions that could answer these questions are not currently under development.     

拉力试验机数据采集与处理系统

本文提出了如何解决机械式拉力试验机存在的问题的方法，介绍了单片机数据采集，处理系统的软硬件，对一些关键问题给出了比较详细的介绍。     

Certification of production-representative/productionsoftware-intensive systems for dedicated test and evaluation

Fundamental questions that arise in the certification of readiness for dedicated test and evaluation of software-intensive systems are addressed. They concern what comprises production-representative or production software, what are the software impacts on dedicated system operational test readiness, how software impacts should be considered in the certification process, and what are the retest/recertification requirements associated with software changes/modifications. A paradigm is proposed that answers these questions and outlines guidelines for implementing a solution to these issues. The paradigm is based on existing test and evaluation events and uses a combination of defense and commercial standards and definitions to propose criteria for software certification and retest or regression test     

基于语义信息的问题分类

问题分类是问答系统的一个非常基础而重要的子模块。以问题的语义信息为分类依据,建立了一个新的问题分类体系,并提出了一种基于《知网》的自动分类方法。利用该方法对507个问题进行分类实验。实验中问题分类的平均召回率为93.72%,平均正确率为82.23%。实验结果表明,该分类方法是有效的并且以语义信息作为分类依据是可行的。     

正确导入CIS的若干问题探析

文章着重分析了我国企业在导入CIS中容易出现的一些误区，并针对这些问题结合我国的国情和企业的现实情况提出了一些观点和建议。     

监测信号的同步处理

本文通过结合监测应用的实例，讨论了监测信号同步处理的一些问题。并提出采用同步处理的方法，将监测应用有机地结合起来，以建立一个完整的监测系统。     

The Emergence of Life

The Rosetta observations have greatly advanced our knowledge of the cometary nucleus and its immediate environment. However, constraints on the mission (both planned and unplanned), the only partially successful Philae lander, and other instrumental issues have inevitably resulted in open questions. Surprising results from the many successful Rosetta observations have also opened new questions, unimagined when Rosetta was first planned. We discuss these and introduce several mission concepts that might address these issues. It is apparent that a sample return mission as originally conceived in the 1980s during the genesis of Rosetta would provide many answers but it is arguable whether it is technically feasible even with today’s technology and knowledge. Less ambitious mission concepts are described to address the suggested main outstanding scientific goals.