集集地震多维地震动频域非平稳特性分析

基于HHT方法和集集地震实际地震记录,利用可表征地震动频域非平稳特性的瞬时频率时程和瞬时幅值时程,对集集地震多维地震动的频域非平稳分布特性、场地条件及震中距对非平稳特性的影响进行了分析.分析结果表明,瞬时频率方法在地震动频域非平稳特性的定量描述上较穿零率方法更为精确,可较好地反映多维地震动的频域非平稳特性.     

美军装备试验鉴定发展历程分析及启示

美军装备试验经历近百年的发展,已形成较为成熟的试验鉴定模式和管理评价体制,试验鉴定能力也处于世界领先水平。美军在装备发展历程中的经验做法十分值得学习和借鉴。本文分析了美军装备试验鉴定发展历程和特点,研究了其试验组织结构的科学构成和运行机制,归纳总结了美军装备试验发展的客观规律和科学经验。在此基础上,得到了顺应装备发展趋势、赋予作战试验鉴定权威、重视体系试验能力建设三点启示,希翼这些启示可为军队装备试验鉴定工作的发展提供参考。     

关注民生 改善民生——中国共产党一以贯之的执政价值取向

民生问题是人类社会发展的基本问题,在科学社会主义理论体系中具有终极性价值意义。中国共产党自成立以来一直高度关注民生并致力于积极改善民生的各项工作,在此过程中形成了具有中国特色的社会主义民生思想,丰富了中国特色社会主义理论体系,为进一步推进我国民生改善的进程指明了方向。     

基于MIDAS的大跨度斜拉桥行波效应分析

针对宜巴段三塔四跨斜拉桥工程实例,结合MIDAS软件,进行动态时程分析,对比研究了行波效应对桥塔、桥墩各控制点的位移、剪力以及轴力的纵向地震反应的影响。通过施加-EL-Centro纵向地震波作用,模拟出斜拉桥控制点的位移、内力地震反应最大值,得出结论：对于多塔斜拉桥,行波效应对各桥塔塔底、各桥塔塔顶内力、位移响应的影响不同。     

Unnecessary or unsung? The utilisation of airpower in Britain's colonial counterinsurgencies

Making extensive use of primary archival documents, this article seeks to explore whether airpower in three of Britain's most significant post-war colonial counterinsurgency campaigns, Malaya, Kenya and South Arabia, was an unnecessary part of British strategy, offering little useful military force due to the futility and strategic damage rendered by offensive bombardment, or whether airpower was indeed an unsung factor that provided operational flexibility through its effectiveness in a supply context, as well as its intelligence role in providing valuable aerial reconnaissance. In all three case studies the role played by the RAF in medical evacuations, in troop drops, in crop spraying during food-denial initiatives, and in providing ‘Voice Aircraft’ for the propaganda campaign, provide insights into an under-explored component of Britain's politico-military efforts in counterinsurgency in the 1950s and 1960s and suggests that the main strategic value of airpower in counterinsurgency, then and now, lies in its non-kinetic functions.     

Exporting professionalism: US efforts to reform the armed forces in the Dominican Republic and Nicaragua, 1916–1933

Why did the United States, a country notorious for supporting coups and military dictatorships in Latin America during the Cold War, seek to depoliticize security forces in the Caribbean basin during the early twentieth century? Drawing from primary sources, I argue that this emphasis on military non-partisanship abroad stemmed from Progressive Era reforms popular at home. These reforms, which stressed bureaucratic efficiency via nonpartisan expertise, had become institutionalized within the US military and State Department and then channelled into the imperial administration of Nicaragua and the Dominican Republic. The State Department and Marine Corps attempted to replace local partisan armies with the kind of professional, nonpartisan armed forces that the US's own military had come to exemplify. That these civil-military reform efforts ultimately backfired should serve as a reminder of the difficulties inherent in using military interventions to transform coercive apparatuses and their societies.     

Bedeviled by a Paradox: Nitze,Bundy, and an Incipient Nuclear Norm

ABSTRACT

This article explores how two influential American policy makers—Paul Nitze and McGeorge Bundy—wrestled with the idea of a norm against the use of nuclear weapons. Existing scholarship has overlooked how both Bundy and Nitze came to understand the idea of nuclear non-use, especially related to the credibility of threats to use nuclear weapons. Using documentary evidence from their personal papers, this article illuminates the thinking of Bundy and Nitze, finding that both engaged with the idea of a norm of non-use of nuclear weapons in their strategic writing and thought.     

Building the next nuclear community

This viewpoint takes stock of the changes in the strategic nuclear landscape in recent decades and reflects on its consequences on the policy community. It finds that the number and scope of issues have expanded considerably; they have manifested themselves in many more regions of the world; and they have become deeply politicized and polarized. The consequences have been twofold: the nuclear policy field has seen the development of an increasingly diverse expert community composed of highly specialized functionalists and regionalists, and it has become ever more divided into two entirely separate ideological camps—one that believes in deterrence, the other in disarmament. The stove-piping of expertise and the widening gap between deterrence and disarmament ideologies are immensely problematic because, in different ways, they stand in the way of the emergence of a better and safer nuclear future. Looking ahead, it is critical to “bust the silos of expertise” and to build bridges between the deterrence and disarmament ideological camps. Only such a community-building effort will help solve today’s and tomorrow’s nuclear challenges.     

Performance of Greek–Roman Artillery

Abstract

The main throwing machines invented and used by the Greeks and adopted, more widely, by Roman armies are examined. The kinematics and dynamics of both light and heavy Greek–Roman artillery are used in order to accurately assess its performance. Thus, a better understanding is obtained of the tactics and strategies of the legions of the Roman Empire as well as the reasons for some brilliant campaigns. Reconstructions of a repeating catapult, considered to be the ancestor of the modern machine gun, are also presented. The development of the mechanical design of such machines is discussed and pictorial reconstructions proposed.     

高校历史学专业英语教学的实践与思考

为加强高校世界史学科的建设和历史学专业培养目标的实现,历史学专业英语教学的实施己成为大势所趋。本文探讨了历史学专业英语教学中的实践经验,以及在教学中存在的问题和完善方法。