拦截高速机动目标的捕获区及微分对策导引律

针对高速机动目标拦截场景,研究末制导段捕获区存在条件及微分对策导引律问题.建立弹目相对运动模型并引入控制动力学模型,采用终端投影方法对相对运动模型进行降阶处理;基于微分对策理论推导一种解析形式捕获区,并具体到直/气复合控制导弹对机动目标的拦截中,该捕获区的存在能够保证对任意机动目标进行准确捕获;重新选取性能指标,将目标...     

BRAZIL AND MEXICO IN THE NONPROLIFERATION REGIME

Latin American countries have historically followed different paths and logics toward the nonproliferation regime. Some states have unconditionally advocated for global and nonproliferation efforts, while others have vehemently opposed such measures or remained ambivalent toward the regime itself. By historically comparing two of Latin America's most influential countries—Brazil and Mexico—this study identifies the underlying domestic conditions and external influences that explain their differences in behavior and policy toward the nonproliferation regime. Because little is known about the reasons why different Latin American countries adopt these different approaches, the purpose of this article is to resolve this problem, primarily by focusing on the ways in which evolving civil-military relations and US influence have shaped nonproliferation policy preferences in Latin America. It concludes with a discussion of how these historical cases might shed light on current nonproliferation policies in Latin America.     

When to commit in a serial supply chain with forecast updating

Negotiations between an end product manufacturer and a parts supplier often revolve around two main issues: the supplier's price and the length of time the manufacturer is contractually held to its order quantity, commonly termed the “commitment time frame.” Because actual demand is unknown, the specification of the commitment time frame determines how the demand risk is shared among the members of the supply chain. Casual observation indicates that most manufacturers prefer to delay commitments as long as possible while suppliers prefer early commitments. In this paper, we investigate whether these goals are always in the firm's best interest. In particular, we find that the manufacturer may sometimes be better off with a contract that requires an early commitment to its order quantity, before the supplier commits resources and the supplier may sometimes be better off with a delayed commitment. We also find that the preferred commitment time frame depends upon which member of the supply chain has the power to set their exchange price. © 2003 Wiley Periodicals, Inc. Naval Research Logistics, 2003     

经济技术开发区建审工作的新特点及应对策略

分析了经济技术开发区建筑审核工作的现状和存在的问题,并有针对性地提出了加强经济技术开发区建审工作的对策。     

舰艇机动穿越深海会聚区对潜艇探测研究

深海会聚区效应是深海水声传播显著的特征,并为远距离潜艇探测提供了有效途径。首先分析了深海会聚区形成的原因和条件,然后根据海区会聚区的预报距离和宽度,构建了舰艇采用两次机动穿越会聚区测算被探测潜艇的位置和运动要素模型,最后通过算例分析舰艇两次穿越会聚区的方法和求解潜艇运动要素和位置的过程,分析结果验证了舰艇穿越会聚区对潜艇定位方法的可行性。     

西部大开发 城市要先行——北疆铁路沿线城镇带发展战略

以北疆铁路沿线城市发展作为先导,带动全疆经济和社会的全面发展,是新疆大开发的重要战略.从区域经济发展的角度,提出了优化区域城镇带的具体方案和完善城镇带空间布局的设想和建议.     

多年冻土区管道的设计技术研究

在多年冻土地带铺设油气管道,是国际能源战略发展的必然,但由于冻土具有冻胀和融沉特性,因此,选用合适的管道设计方法保证管道安全运行一直是一大研究热点。通过对多年冻土区管道所承受载荷类型的分析,论证了采用基于应变的管道设计方法的合理性,并着重对拉伸应变极限和压缩应变极限的确定方法进行了探讨,指出在实际设计中,应该选用相对宽松的压缩应变极限值和严格的拉伸应变极限值。     

MONGOLIA

Formed according to broad principles laid out by the United Nations, nuclear-weapon-free zones (NWFZs) play an important role in promoting nuclear nonproliferation, paralleling and complementing the Treaty on the Non-Proliferation of Nuclear Weapons. But the traditional regional treaty-based path to establishing NWFZs is not open to all states. Owing to various factors, some countries cannot realistically follow the path of states that have established traditional NWFZs. Mongolia, having declared itself a single-state NWFZ in 1992 and gained UN General Assembly recognition of this status in 1998, may provide an example for other countries to follow. This viewpoint presents Mongolia's case as a state seeking to acquire a nontraditional nuclear-weapon-free status despite unfavorable geopolitical circumstances. The case of Mongolia clearly demonstrates that the creation of a credible, single-state NWFZ status is possible, but demands the support and flexibility of both neighboring states and the nuclear weapon states.