失去润滑条件下弧齿锥齿轮传动系统瞬态温度场Simulink仿真分析

根据传热学理论和热网络法,以某型直升机尾减速器弧齿锥齿轮传动系统为研究对象,建立了其温度场Simulink仿真计算模型。基于该模型,计算获得该传动系统正常润滑条件下的稳态温度场,并以它作为初始条件计算分析该传动系统失去润滑条件下的瞬态温度场,为预测该弧齿锥齿轮传动系统在失去润滑条件下的干运转生存能力提供理论依据。     

航空导航技术的发展方向

针对航空导航的特点,对现有航空导航装备的特点进行了分析,并结合未来作战的需求,给出了航空导航技术的发展方向,主要是组合式导航体制,将卫星导航与惯导的组合进一步与地形辅助导航、地球物理导航、地磁导航等方式结合起来.     

Component importance for linear consecutive‐ k ‐Out‐of‐ n and m ‐Consecutive‐ k ‐Out‐of‐ n systems with exchangeable components

Measuring the relative importance of components in a mechanical system is useful for various purposes. In this article, we study Birnbaum and Barlow‐Proschan importance measures for two frequently studied system designs: linear consecutive k ‐out‐of‐ n and m ‐consecutive‐ k ‐out‐of‐ n systems. We obtain explicit expressions for the component importance measures for systems consisting of exchangeable components. We illustrate the results for a system whose components have a Lomax type lifetime distribution. © 2013 Wiley Periodicals, Inc. Naval Research Logistics, 2013     

When Peacekeepers Fail Thousands are Going to Die. The ETO in Rwanda: a Story of Deception

This study develops the concepts of fourth generation operations and the associated principles. First, the concept of fourth generation operations is introduced and defined. Fourth generation operations are the evolution and extension of third and fourth generation warfare based on a change of tactics, technology, and combatants. These operations are currently ongoing in Afghanistan and Iraq, and with the global war on terrorism. Based on the framework of US joint doctrine, the supporting principles of fourth generation operations are developed. This requires the introduction of the principle of Population Perception.     

The effect of catastrophes on the strategic customer behavior in queueing systems

We consider the single server Markovian queue subject to Poisson generated catastrophes. Whenever a catastrophe occurs, all customers are forced to abandon the system, the server is rendered inoperative and an exponential repair time is set on. During the repair time new arrivals are allowed to join the system. We assume that the arriving customers decide whether to join the system or balk, based on a natural linear reward‐cost structure with two types of rewards: A (usual) service reward for those customers that receive service and a (compensation) failure reward for those customers that are forced to abandon the system due to a catastrophe. We study the strategic behavior of the customers regarding balking and derive the corresponding (Nash) equilibrium strategies for the observable and unobservable cases. We show that both types of strategic behavior may be optimal: to avoid the crowd or to follow it. The crucial factor that determines the type of customer behavior is the relative value of the service reward to the failure compensation. © 2013 Wiley Periodicals, Inc. Naval Research Logistics, 2013     

Putin's Wars: The Rise of Russia's New Imperialism

ABSTRACT

This article discusses the Rhodesian Front regime propaganda warfare strategy during Zimbabwe’s war of liberation. It uses the case of the Chilonga area of Chiredzi located in the south-east of Zimbabwe to demonstrate that propaganda warfare was introduced as a measure to counter guerrilla infiltration and civilian cooperation with them. Drawing on ideas of military anthropology vis-à-vis the importance of cultural awareness in counterinsurgency, the paper argues that the efforts of the Rhodesian Front regime to use propaganda were fruitless. This is because they mostly ignored the culture of the Shangani, local people. Despite that, there were other reasons for the failure of the Rhodesian Front’s propaganda strategy, including the lack of conformity between politics and military action.     

Croatia's bitter harvest: Total National Defence's role in the Croatian War of Independence

Croatia's successful bid for independence was one of the defining moments of the immediate post-Cold War period. Nevertheless, the means that Croatia used to obtain independence remains relatively unexamined by academics. This article focuses on the early period of Croatia's bid for secession, and specifically the role that Yugoslavia's policy of Total National Defence played in facilitating its independence. Unlike in Slovenia, where the legacies of Total National Defence facilitated Slovenia's bid for secession, in Croatia the decision of its political leaders meant that the country largely neglected its positive legacies, resulting in a protracted four-year struggle.     

Unraveling the violence in Kazakhstan

There were several high-profile violent incidents in 2011 in Kazakhstan, including several bombings, shootings that targeted police, and a protest turned clash that resulted in a number of deaths. Some of the perpetrators reportedly had links with radical religious groups. An overlooked aspect of the violence is how it is reported in Kazakhstan. There are active, competent media in Kazakhstan, which are largely unknown in the West. An examination of these incidents using the media in Kazakhstan can provide a unique insight into what took place. While Western sources quickly blamed radical religious groups with international connections, media in Kazakhstan have found that there are other reasons for the violence.     

Army reconstruction in the Democratic Republic of the Congo 2003–2009

Since the peace agreements of 2002–2003 which ended the second war in the Democratic Republic of Congo, reconstruction of the army has been an inherently political process, in common with other attempts to carry out security sector reform (SSR). This article briefly sketches out the Congolese army's history, then attempts to fill a gap in the literature on Congolese SSR by detailing what can be found of the actual structure and shape of the present army. The efforts that have been made to reform the army are then examined, followed by a conclusion which examines the major issues and possible ways forward.     

Baixa do Cassang: Ending the abuse of Portuguese Africans

On 4 January 1961 in Baixa do Cassange, in the north of Angola, the blacks who worked in the cotton fields began a strike. The army with air support was called to quell the rebellion, and the article emphasizes the importance of air support tethered to the ground forces, particularly in a remote and vast area of operations in the tropical rainy season. In this case, the support originally came in the form a squadron of Lockheed PV-2 Harpoons from Luanda, some 300 kilometers away. These open-ocean reconnaissance aircraft and their crews were ill-suited for the task. When this became apparent, four small Auster D5/160s were relocated from Negage to Malange, among the ground forces. The Austers flew reconnaissance missions over the troubled zones, dropped provisions and messages to the advancing ground forces, and served as a backup communications link. When the strike ceased after three weeks, the Austers assumed a humanitarian role in support of the starving population. The conclusion is that air support to ground forces is indispensable, must be properly tailored to the job, and must operate as an integral part of the ground forces.