美国是“负责任”的实力下降霸权吗?——兼论中国必须掌握国际关系理论研究的话语权

随着美国的可持续发展能力和经济总量的相对下降,巨大的军费开支、难以缩小的财政赤字、自我变革能力的弱化阻碍着其重新振兴,其政府的国内治理能力下降。相应地,美国的软实力不断下降和所主张的发展模式对其他国家的吸引力也在减弱。从中长期来看,美国实力的相对下降已是一个客观趋势。作为世界唯一霸权,处在实力下行过程中的美国是否是一个负责任的国家,这是一个关系到全局的问题。更重要的是,在西方国际关系理论的主导下,理论框架和议题设置完全由西方决定,这类问题往往被遮蔽掉了。处在国力上升中的中国,在国际关系理论中如不能设置自己的议题,而只顺着西方设置的议题研究,将无法有效维护自己的国家利益,也难以争取国际秩序变革中的主动权。     

逆合成孔径雷达图象的旁瓣清除技术

<正> 随着改革开放的扩大和深入,我国以吸收利用外资为重点的三资企业发展迅速。到1992年一季度,共批准外商投资企业32000多家,吸收外资230亿美元,年递增率达30％以上。1992年,全国合资企业出口创汇可望达到100亿美元。三资企业不仅发展速度比较快,而且走势也在发生新的变化。总结分析外商投资走势,引导三资企业向高新层次递进,对于加大我国开放力度,促进外向型经济的良性发展,是十分必要的。     

美国是东亚区域合作的推动者还是阻碍者?

冷战结束至今,东亚区域合作得到了很大发展。地区多边组织、论坛、会议、自由贸易区等区域合作形式在本地区的政治、安全和经济等诸多领域中扮演着日益重要的角色,包括中国在内的东亚国家都已经在不同程度上介入区域多边合作进程之中。东亚区域合作的进程可能对未来美国与东亚的关系产生意义深远的影响。美国主要根据其自身利益的判断来应对东亚区域合作,对于把美国排除在外的区域合作形式可能采取不欢迎的态度,对于把美国包括在内的区域合作形式则可能采取积极推动的立场。     

以非线性理论阐述反馈振荡器的频率与幅度的稳定性

本文首先对线性的频率稳定理论用于近似正弦反馈振荡器的线性频率稳定理论,进行了评论性的回顾。在这方面,解释所谓的线性振荡器是清楚的。其后,是应用描述函数法和判决方程法所得到新的表达式,去阐述反馈振荡器考虑成一个非线性网络时的振荡频率和振荡幅度的稳定性。     

Program Evaluation and Review Technique (PERT) in Construction Schedule Risk Assessment

Construction project scheduling is one of the most critical factors for project success measurement.Not only for the project planning but for construction process management,the scheduling is the basic tool for communication between the owner and the project manager.By developing the schedule before the project starts,the owner knows in advance that the expected timeline of the project.By preparing construction process scheduling,the owner and general contractor can better manage the subcontractors,sub-trades progress,materials storage and deliveries,labors schedule and equipment set up which will eventually save time,money and hassle.Basically,Critical Path Method(CPM) is commonly used in the construction industry.CPM is a deterministic method that assumes that through the network,there is at least one path that determines the project duration and that the path is the critical path.CPM does not consider the uncertainty in the activities;rather it assumes that each activity can be finished in the given situation.Program Evaluation and Review Technique(PERT) is a stochastic technique which is based on the assumption that the duration of a single activity can be described by a probability density function.PERT takes into account the uncertainty during the construction process and has been created out of the need to plan,schedule and control complex projects with many uncertainties.The PERT approach is stated in some books and papers,but there is no deep investigation on the application in the schedule risk assessment.This paper investigates the PERT work process and takes a valuable try on the construction schedule risk assessment by using case studies.The utilization in the estimate the construction liquidated damage with the uncertainties is performed,which also can be used in the insurance company to calculate the insurance premium.     

Terrorism and tourism as logical companions

The symbiotic relationship between terrorism and tourism needs to be understood and acted on, not just in terms of security and marketing, but in terms of such factors as planning, site development, employment policies, political risk analysis and emergency management. This article looks at the relationship between tourism and terrorism from several perspectives. The political and economic impact of terrorism on tourism is assessed, including the sensitivity of the tourism industry to general political strife and the vulnerability of travellers and tourist facilities to terroristic activity. The nature of terroristic violence and the objectives of terrorist groups are evaluated to determine why and how attacks on tourists and facilities may fit the organizational and political objectives of terrorist groups. Finally, the article suggests how the industry and policy makers must proceed to reduce the vulnerability for tourists and the travel sector.     

Computerized management of tourism marketing information

This article discusses the benefits of applying computers to the management of marketing Information by the tourism industry. It looks at the role of regional tourism associations, and the monitoring of promotional programmes and details how such a system operates and draws together its potential applications.     

Book reviews

Abstract

This article examines the cultural field of fitness as a network of producers, consumers, products and practices that has developed around the care of the body through physical exercise. Drawing on a thematic text analysis of US exercise manuals, the paper focuses on how the commercial fitness field naturalizes associations between physical exercise and leisure, and between leisure and self‐work. In particular, the analysis examines three themes and their relevance to our broader understanding of leisure in contemporary consumer society: the management of leisure time; the use of leisure for self‐investment strategies; and the promotion of consumption as the framework for leisure and an accompanying notion of pleasure. The fitness field casts light on how leisure more generally is constructed as a sphere of obligations to make productive use of one’s time, to improve one’s body and self, and to do so through the wares of the consumer marketplace. The cultural imaginary of leisure as a time of freedom from work and responsibility is thus recast, in an age of individualization, as a time of freedom to accomplish the work of self‐production.