新时期高校学生社团活动的特点和作用

高校学生社团活动在校园内蓬勃兴起,根据学生社团活动在新时期的新特点和对学生工作及跨世纪教育工程的特殊影响和作用,相关部门应给予积极的扶持,实施有效的管理,进行正面的引导,为最终实现高校教育目标将起到正面的。积极的作用     

相继增压柴油机推进装置增压系统特性研究

针对船舶推进装置中柴油主机相继增压特性的优化问题,在理论分析的基础上,建立了基于准稳态假设的增压系统能量平衡模型.对相继增压系统的稳、动态特性进行了分析,讨论了相继增压系统的特性优化问题,为主机采用相继增压技术的柴油机推进装置的性能优化、控制策略的制订提供了理论依据.     

Better is the Neighbor?

Abstract

This study applies the Sequential Panel Selection Method (SPSM), to investigate the convergence properties of the military expenditure of the North Atlantic Treaty Organization (NATO) during the period of 1990–2015. Compared to the traditional methods, SPSM considers fundamentally general spatial homogeneous and heterogeneous relationships with countries and examines the evolution of military expenditure. We find that four-fifths of NATO member countries have been convergent with the UK, but no country’s military expenditure is convergent with the US. This means that there is no significant linkage effect in the US for NATO military expenditure. While they are allies of the US, the majority of NATO member countries’ military expenditures are consistent with UK military expenditure. The main reasons are due to the geographical space layout and the international relationship convergence. The results indicate that more than four-fifths of NATO member countries have been coordinated with convergence theory and spillover effect.     

金字塔渐进融合低照度图像增强网络

针对现有低照度图像增强网络对不同尺度特征信息存在感知与表达能力不足的问题,提出金字塔渐进融合低照度图像增强网络模型。网络对图像进行多次下采样操作以组成特征金字塔,通过在特征金字塔的三个不同分支上加入跳跃连接,将不同尺度的特征图进行相互融合。通过精细恢复模块进一步提取精炼信息,将特征图恢复到正常的光照图像。结果表明,该网络模型不但能有效地提升低照度图像的整体亮度,而且能很好地保持图像中的细节信息和清晰的物体边缘轮廓,同时能够有效地抑制图像中的暗部噪声,使增强后的图像整体画面真实自然。     

序列近似优化方法及其在火箭外形快速设计中的应用

针对序列近似优化方法在代理模型构造与采样策略等方面的不足,基于采样点局部密度,引入与局部密度成反比的样本点影响体积概念,通过优化总影响体积确定径向基函数最优核宽度,满足序列近似优化过程不同规模、非均匀样本条件下的函数近似需要;建立潜在可行域最大距离加点准则,并与潜在最优加点准则结合平衡算法的探索能力与开发能力;建立三步收敛判定准则;构建改进序列近似优化的算法流程。对于Golinski减速器的优化设计问题,算法在目标函数调用42次后便搜索到全局最优解,体现了其良好的全局寻优能力与搜索效率。以"天航二号"火箭为例,建立其外形优化问题数学模型,所提优化方法在调用原始计算模型165次之后便搜索到全局最优解,大大提高了设计效率,同时飞行试验也表明设计结果满足要求。     

SAR图像目标分割与方位角估计

图像分割和目标方位角估计是进行SAR (SyntheticApertureRadar)图像自动目标识别的重要步骤。文章提出了一种基于MRF (MarkovRandomfield)模型的SAR图像分割算法 ,利用ICM (IterativeConditionalMode)局部优化方法 ,获得MAP (maximumaposteriori)准则下的图像分割结果 ,将图像分割为目标、阴影、背景三部分。然后确定目标离雷达最近的点 ,从而得到目标的主导边界 ,并估计出目标的方位角。用MSTAR (MovingandStationaryTargetAcquisitionandRecognition)数据进行实验 ,估计方位角的准确性与现有算法的结果相比 ,具有明显提高     

娱乐场所简易自动喷水灭火系统设计

歌舞娱乐放映游艺场所多设置在已建建筑内,往往不具备设置自动喷水灭火系统的条件。为此,笔者提出在这类建筑中设置简易自动喷水灭火系统的设想,给出了简易自动喷水灭火系统的组成、工作原理及特点,探讨了设计简易自动喷水灭火系统应注意的问题。     

Fully sequential procedures for comparing constrained systems via simulation

We consider the problem of finding the system with the best primary performance measure among a finite number of simulated systems in the presence of a stochastic constraint on a single real‐valued secondary performance measure. Solving this problem requires the identification and removal from consideration of infeasible systems (Phase I) and of systems whose primary performance measure is dominated by that of other feasible systems (Phase II). We use indifference zones in both phases and consider two approaches, namely, carrying out Phases I and II sequentially and carrying out Phases I and II simultaneously, and we provide specific example procedures of each type. We present theoretical results guaranteeing that our approaches (general and specific, sequential and simultaneous) yield the best system with at least a prespecified probability, and we provide a portion of an extensive numerical study aimed at evaluating and comparing the performance of our approaches. The experimental results show that both new procedures are useful for constrained ranking and selection, with neither procedure showing uniform superiority over the other.© 2010 Wiley Periodicals, Inc. Naval Research Logistics, 2010     

谈习语的翻译技巧

习语形象生动,言简意赅,是语言发展的结晶。因其内涵丰富,故在翻译上难度极大,如何传神翻译实为一大难题。习语的特征、中英习语文化特色比较、习语的文化色彩及习语的翻译技巧。     

非会计专业《财务会计》课程的教学特点与教学组织方法研究

《财务会计》是高等院校经济、管理类专业的核心基础课程，在非会计专业学生知识结构中发挥着越来越重要的作用。本文旨在分析非会计专业学生《财务会计》课程的教学特点，探索其教学组织方法，以帮助学生更好地掌握该课程的主要内容，实现教学目标。