卫星光通信中平台抖动补偿技术研究

以卫星光通信系统为例,对空间光通信系统中光学平台的抖动进行了分析。研究了一种自调节前馈补偿技术,通过自适应信号处理或对前馈控制器进行直接优化,可对光学平台的抖动进行有效抑制。     

空间光通信ATP技术及其进展

对自由空间激光通信光束自动捕获、跟踪、瞄准（ＡＴＰ）系统的结构与系统主要技术指标进行了分析和讨论。通过对其中典型系统的介绍,进一步描述了ＡＴＰ技术的最新进展,论证了空间激光通信的可行性。     

Self‐Construal,Career Decision Self‐Efficacy,and Perceived Barriers Predict Mexican American Women's Life Satisfaction

This study used the social cognitive theory of well‐being (SCTW; Lent, 2004 ) to examine the role of career decision self‐efficacy (CDSE), perceived educational barriers, and independent self‐construal on the life satisfaction of 176 Mexican American college women. A 3‐step hierarchical regression analysis indicated that independent self‐construal, CDSE, and fewer perceived educational barriers significantly predicted greater life satisfaction among Mexican American college women above and beyond the influence of socioeconomic status and generational status. These findings are consistent with SCTW and highlight the need for counselors and researchers to be aware of the role that self‐construal, CDSE, and perceived educational barriers can have on Mexican American women's life satisfaction. Implications for practice at the secondary‐school and university levels are discussed.     

西部民族村寨旅游业发展促进乡村全面振兴的逻辑与路径

旅游业一直是西部少数民族村寨脱贫致富、乡村社会经济发展的重要依托产业,也必将长期伴随着民族村寨乡村振兴发展的整个进程。本文在阐释乡村振兴、乡村全面振兴概念基础上,针对当前西部地区民族村寨发展面临的乡村衰落困境,提出旅游业能够促进乡村实现全面振兴是其最显著的特点,探索分析中国特色的旅游业促进西部民族村寨乡村全面振兴的道路,并按照2017年中央农村工作会议提出的“走中国特色社会主义乡村振兴道路”、2018年中央一号文件关于实施乡村振兴战略分“三步走”目标任务等一系列中央精神指导,尝试性提供旅游业促进西部民族村寨乡村全面振兴的路径选择。     

古希腊智者语言学思想述评

本文以古希腊哲学史为背景,从智者运动入手,截取人类哲学史的一个层面,试图阐释智者的语言学思想及其哲学渊源,从而折射出语言研究与哲学研究的密切关系,为语言学研究和发展提供一点历史借鉴.文章重点评述智者在语言本质、语言研究及语言研究方法几方面的基本思想及观点,以揭示其语言学研究的成果与贡献.     

Using the Shapley Decomposition to Disentangle the Impact of Circumstances and Efforts on Health Inequality

Following previous work on inequality in health opportunity, this paper attempts to determine the contribution of circumstances, efforts and lifestyle, and demographic variables to the overall inequality in health in Luxembourg. Health is measured via the answers given to a question on self-assessed health and is considered as an ordinal variable. The educational level of each parent, the financial situation of the family during childhood, the area of birth of the individual, and of his/her parents, and the year of immigration are considered as circumstances. Effort and lifestyle variables are proxied by information on the educational level of the individual, whether he/she smoked and whether he/she had a physical activity on a regular basis. Sex and age are considered as demographic variables. To solve the issue of correlation between circumstances and effort and lifestyle the estimation is implemented in two stages. In the first stage, each effort and lifestyle variable is regressed in a separate equation against the vector of circumstances and demographic variables and, in a second stage, the individual health status is regressed against the vector of circumstances and demographic variables along with the estimated residuals of the effort equations described previously. The respective impacts of the three categories of explanatory variables (circumstances, effort and lifestyle and demographic variables) on health inequality are derived via a Shapley decomposition of the likelihood ratio of the health ordered logit regression. It appears that differences in circumstances and effort and lifestyle explain each around a quarter of this likelihood ratio.     

EU post-accession Polish migrants trajectories and their settlement practices in Scotland

The presence and the apparent permanence of post-accession EU migrants in the UK is of significant interest to both academics and politicians. Studies have debated whether migration from new accession countries to the UK mark a new type of migration often described as ‘liquid’ and ‘open ended’, or whether these migrants will settle in the new destination countries. Based on a qualitative study of Poles who have lived in Scotland for at least six years, we observed four typologies of what we call migrants’ settling practices: (1) stayers, (2) over-stayers, (3) circular and transnational migrants and (4) economic migrants. The findings from this study demonstrate that Polish migrants do not have fixed ideas about the duration of their migration (in terms of a sense of permanence) but instead focus on diverse links, anchors or attachments in Scotland and Poland in describing their settling practices. Thus, the main contribution the article makes is to present an in-depth understanding of what settlement means from the perspective of migrants themselves. This paper concludes by providing a short comment on implications of the outcome of the Referendum on EU membership ‘Brexit’ in June 2016 on Polish migrants settling practices.     

一种DES数据加密实现方法

本文分析了 DES 算法,设计了一种用 Z-80CPU 芯片实现 DES 数据加密方案,并用单板机 TP-802实现了1200bit/s 的数据加密。文中还提出了对数据加密系统进行动态检测的方法。     

From cultural knowledge to intercultural communicative competence: changing perspectives on the role of culture in foreign language teaching

Approaches to the concept of culture and teaching cultural competence in a foreign language classroom have been changing over the last decades. The paper summarises, compares, contrasts and evaluates four major approaches to teaching cultural competence in foreign language teaching, that is, knowledge-based approach, contrastive approach, Communicative Language Teaching and intercultural communicative competence approach.     

基于O-U过程的配对交易与市场效率研究

套利交易是一种重要的量化交易策略,本文首先提出了基于O-U过程的配对套利策略,实证检验了基于O-U过程的套利策略和基于协整理论的传统套利策略,研究结果表明O-U过程套利策略与传统协整套利策略相比具有成本低、收益高和风险小等优点。另外,本文从价格对信息的灵敏度、价格均衡的内在机制、市场风险和交易成本四个方面,发现O-U过程套利策略更能促使股价快速回归均衡水平,更显著地提高证券市场的运行效率。