拉美区域民族主义的历史嬗变:民族认同与多元表达

拉美区域民族主义是拉美经济社会发展的重要推动力之一。从独立之初的"美洲人"身份认定,到墨西哥革命后拉美民族认同的最终形成,拉美区域民族主义经历了复杂的历史嬗变。同时,在漫长的历史发展过程中,国有化、地区一体化、反美和对民族文化的坚持,是其多元表现形式中贯穿始终的内容。     

推动上海社会高质量发展的成效、难点和举措

上海在加快城市功能转型、实现经济高质量发展的同时,更要把"扎实推动社会高质量发展"作为社会建设的总体目标,深入践行"人民城市人民建,人民城市为人民"的重要理念,始终坚持发展为了人民、发展依靠人民、发展成果由人民共享,高质量建成"幼有善育、学有优教、劳有厚得、病有良医、老有颐养、住有宜居、弱有众扶"的社会主义现代化国际大都市.     

扁平超宽连续箱梁桥空间受力性能分析与研究

扁平超宽箱梁桥由于具有较大的宽跨比，其受力性能呈现明显的空间效应，通常的单梁模型计算已不能满足设计的精度要求，主要体现在宽箱梁各腹板纵向受力的差异性以及明显的剪力滞效应，同时由于大宽跨比使得横向预应力的作用不仅增加了顶板的压应力，也使得整体箱梁截面下缘出现拉应力，造成边腹板底部纵向裂缝，这些都给宽箱梁的设计带来了不利。因此为研究宽箱梁的空间效应，本文运用ANSYS有限元软件建立了全桥实体模型，计算了各腹板纵向受力差异及剪力滞效应，以及横向预应力对箱梁横向受力的影响，得到了一些有益的结论，为设计人员提供一定的参考。     

血亲网络对近代东北移民经济差异的影响:1845～1934年

文章利用20世纪30年代东北地区农村调查数据,讨论了作为移民网络重要组成部分的血亲网络对移民间经济福利水平差异及社会流动性的影响。通过构建计量模型进行分析,结果显示:血亲网络对移民提高自身经济福利水平具有显著的正向影响,是导致移民间经济福利水平差异的重要因素;移民在血亲网络的作用下可以实现自身的向上社会流动。文章不仅分析了血亲关系在近代东北移民活动中对提升移民经济福利所起到的重要作用,还揭示了血亲网络在移民群体中所体现的经济功能。     

滑动吸附式壁面清洁装置的设计与研究

为实现对高楼玻璃幕墙灵活、高效地清洁作业,设计了一种滑动吸附式壁面清洁装置,分析了清洁装置的转向运动学和动力学模型,阐述了清洁装置各组成部分的设计结构和工作原理.试验表明:该滑动吸附式壁面清洁装置可实现在玻璃幕墙的竖直方向全方位自由移动,控制灵活、操作简单,具有较高的经济性和实用性,有较好的市场应用前景.     

A Security Model and Legal Guarantee for Chinese Maritime Shipping: As Exemplified in the Response to Piracy along the 21st Century Maritime Silk Road

The Belt and Road Initiative is an important decision for the great rejuvenation of the Chinese nation. Maritime security has a significant place in this process. In recent years, there have been frequent violent terrorist incidents at sea, including piracy, armed hijackings and terrorist attacks, posing a dire threat to both international and Chinese maritime transport interests and seriously challenging the fulfillment of the maritime part of the “Belt and Road Initiative.” Five direct measures can be taken to protect ocean shipping from violence at sea. One example is the defensive measures taken against the Somali pirates. The employment of armed guards from professional security companies on board ship is an effective model for guaranteeing maritime security; it not only meets the standards of international law, but is also legally permitted in many developed countries and regions, and is thus strategically significant for overall Chinese maritime security. In the Chinese context, this model carries its own legal risks. We should embrace a new approach to national security law, strengthen legal guarantees and make concerted efforts to provide warship (military aircraft) escorts to jointly build an optimum model of Chinese maritime security in order to ensure the realization of core Chinese maritime interests.     

Intergenerational Mobility Modes and Changes in Social Class in Contemporary China

Using data from three China General Social Surveys, this paper analyzes changes in the basic situation of intergenerational mobility among social classes in China over the past 60 years. General social mobility was found to have increased, but social openness tended to show a wave-like pattern of change. Despite this, intergenerational inheritance was the main form of intergenerational mobility in every period. With the transformation of the socioeconomic system, the main mechanism of social exclusion changed from “systemic exclusion” to “market exclusion,” leading to changes in the structure of social opportunity. As a result, the form taken by intergenerational mobility varied significantly. This is chiefly evident in the gradual decline in the dominance of intergenerational inheritance among particular strata, with cross-class cyclical mobility becoming more difficult. On the one hand, changes in the social exclusion mechanism may increase social openness, making society more dynamic and strengthening social legitimacy. On the other hand, as the dominant class learns how to use market exclusion to achieve class reproduction, class solidification may still be possible in a future Chinese society.     

双线自闭区段客货列车速度比对扣除系数的影响分析

目前扣除系数的计算方法主要为分析法与模拟法，扣除系数的常见影响因素有客货列车速度比、区段均衡度、追踪间隔时分等。通过模拟法进行不同客货列车速度比下的运行图铺画，得出客货列车速度比对扣除系数的影响规律分析。实验表明：随着客货速度比的增加，扣除系数将逐渐变大，据此建议在相关双线客货混跑区段，选取合适的客货速度比，以减小对运行图通过能力的影响     

Construction of Fuzzy Control Charts Based on Weighted Possibilistic Mean

The problem of constructing control charts for fuzzy data has been considered in literature. The proposed transformation approaches and direct fuzzy approaches have their advantages and disadvantages. The representative values charts based on transformation methods are often recommended in practical application. For representing a fuzzy set by a crisp value, the weight of importance of the members assigned with some membership levels in a fuzzy set should be considered, and the possibility theory can be employed to deal with such problem. In this article, we propose to employ the weighted possibilistic mean (WPM), weighted interval valued possibilistic mean (WIVPM) of fuzzy number as a sort of representative values for the fuzzy attribute data, and establish new fuzzy control charts with WPM and WIVPM. The performance of the charts is compared to the existing fuzzy charts with a fuzzy c-chart example via newly defined average number of inspection for variation of control state.     

Resilience,Leadership and Work Engagement: The Mediating Role of Positive Affect

This study examines the influence of resilience and transformational leadership on work engagement, and it investigates the mediating effect of positive affect. A total of 422 employees at a large IT company participated the survey. Participants completed established measures of resilience, transformational leadership, positive affect, and work engagement. The results indicate that resilience and transformational leadership are positively related to work engagement. Structural equation modeling analysis shows that positive affect partially mediates the relationships between resilience, transformational leadership, and work engagement. Theoretical contributions, practical implications, and future research directions are discussed.