CO-OFDM系统中基于线性预处理的新相位噪声抑制算法

针对相干光正交频分复用（coherent optical orthogonal frequency division multiplexing,CO-OFDM）系统中相位噪声引起的载波间干扰（inter-carrier interference,ICI）问题,提出了一种基于线性预处理的新判决反馈相位噪声抑制算法。该新算法改进了线性预处理部分,利用循环前缀与OFDM符号固有的相关性,在时域进行简单的线性组合运算,充分利用了OFDM符号中冗余信息。仿真分析表明,在激光器线宽为200 kHz且误码率（bit error rate, BER）为10－4时,与判决反馈相位噪声抑制算法和一次迭代的判决反馈相位噪声抑制算法相比,该新算法BER曲线的信噪比（signal to noise ratio,SNR）分别改善了3 dB和1 dB,有效地降低由ICI引起的错误平层。     

The Progression of Sexual Relationships

The authors examine factors associated with the advancement or dissolution of newly formed sexual relationships. Data from the 2006–2010 National Survey of Family Growth (NSFG) was used to examine women and men aged 18–39 (n = 2,774) whose most recent sexual relationship began within the 12 months before their interview. Results indicate that newly formed sexual relationships are often transitory. By 12 months, only 23% of respondents remained in nonresidential sexual relationships, another 27% were cohabiting with that partner, and half had ended their relationships. Sexual relationships formed before age 25 are significantly more likely to break up than to transition into cohabitation. Indicators of social class disadvantage, such as living with a stepparent, expedited cohabitation, whereas measures of advantage, such as having a college‐educated mother, deterred transitions into shared living. Racial differences also emerge: Blacks were less likely than Whites to transition rapidly into shared living.     

Managers in the Global Economy: A Multilevel Analysis

We examine individual‐ and country‐level determinants of managerial employment, using data from the 1989 to 2009 waves of the World Values and European Values Surveys (n = 89,336 employed adults in 59 countries). Reflecting the rise of the transnational capitalist class, we find that factors related to globalization and international political institutions are most strongly associated with opportunities to join the managerial class relative to factors related to the business‐cycle or development. Additionally, in a subset of countries with detailed occupational information, we find that global trade has a particularly strong, positive association with the odds of being a corporate manager in a large firm.     

Fair and efficient division through unanimity bargaining when claims are subjective

In a subjective claims problem several partners have conflicting perceptions on how a jointly produced surplus should be divided fairly amongst them. In a large-scale experiment, we compare the fairness and efficiency of three unanimity bargaining procedures used to reach a consensus in a three-partner subjective claims problem. Under each procedure partners move sequentially, making alternating proposals. The procedures differ in whether they ask for a complete division proposal (Offer and Exit rule) or only for a proposal regarding the partner’s own fair share (Demand rule); and in whether partners have to accept the entire division proposal (Offer and Demand rule) or only their own share (Exit rule). For the fairness assessment partial and impartial fairness views are used and we find that the Offer rule performs best in terms of allocative fairness and no worse in terms of efficiency.     

Palestinian-Israeli single mothers accord motherhood a new meaning ‘I would like to teach my children a new way of life … I'm responsible for them now’

Over the last three decades, Palestinian society in Israel has undergone numerous changes, reflected in the rising numbers of families headed by single mothers. This article is based on a study conducted between 2007 and 2011 among 24 divorced, separated, and widowed Palestinian single mothers in Israel. I analyze this emerging family configuration, focusing on these women’s experiences as mothers and on how they accord new meaning to motherhood. My analysis will deal with the diverse ways these women ‘do motherhood’ and negotiate with different familial players. It will extend beyond the discourse on motherhood to shed light on the current changes in power and gender relations taking place in Palestinian-Israeli society.     

Kindergartners’ Development of Privileged Subjectivities within an Elite School

This case study investigates how kindergarten children thought and talked about their school in three socially stratified school settings: public, charter and private, and the extent to which they grasped sociocultural understandings related to social class. Data included field notes, interviews with the children and teachers, and parent surveys. A Bourdieuian lens illuminated emergent themes. Results indicate that children in the elite setting had developed sophisticated understandings of their privileged social locations and understood their position as distinct from other children.     

都市类报纸与"公共新闻"实践探索——以《楚天都市报》、《武汉晚报》为分析对象

“公共新闻”运动是20世纪90年代美国新闻界发起的一场声势浩大的新闻改革运动。“公共新闻”倡导媒体关注公共领域建设,鼓励民众参与公共事务,积极寻求与公众、政府间的沟通与交流,以探寻公共问题的解决之道。近两年国内也掀起了一股“公共新闻”热潮,其中都市类报纸的“公共新闻”实践具有一定的代表性,不仅秉承了“公共新闻”的核心理念和基本原理,同时也具有自身特色,对新闻媒体探索如何在当前新的社会形势下发挥信息沟通和舆论导向作用具有积极的示范效应。     

基于系统学理论的大学生班集体建设规律探析

加强班集体建设,尤其是一年级的班风、学风建设非常重要,是使大学生更好的成长、成才的一项重要的基础性工作。为此,在长期工作实践的基础上,从理论上探讨大学班集体建设的规律,将班集体作为一个系统来研究,提出一套行之有效的办法来加强班集体建设。对班集体建设由浅入深地研究的过程,也是对大学生思想政治教育工作由浅入深理解和实践的过程,是由感性到理性,由实践到理论,再由理论指导实践的过程,是不懈追求、不断创新的过程。     

科举制度对中国传统礼俗的影响及启示

科举制度作为古代一项重要的选官制度,不仅对帝制中国隋唐以后的政治制度、士习民风、文化教育产生了广泛影响,而且还对在人们社会生活中发挥着极其重要功能的社会礼俗产生了深刻影响。其影响体现在：礼俗内容纳入科考范围,使得社会礼俗得到广泛宣传与普及;遵循能力本位,促使礼制下移;造就数目庞大的士绅阶层,担当传统礼俗的实践者与传播者;衍生出了众多富有科举色彩的传统礼俗。     

Occupational mobility and cognitive ability: A commentary on Betthäuser,Bourne and Bukodi

This commentary critiques Betthäuser, Bourne and Bukodi's (2020) paper which finds that cognitive ability does not substantially mediate class of origin effects on educational and occupational outcomes. From these results, they conclude that cognitive ability is only of minor importance for social stratification, reasserting their view of the primacy of class origins for social stratification. The central issue surrounding cognitive ability in social stratification is its effects on socioeconomic attainments vis-à-vis socioeconomic origins, not the extent that cognitive ability mediates classorigin effects. Their analytical strategy of estimating the extent that cognitive ability mediates class origineffects is misleading because: it ignores the only moderate associations of socioeconomic origins with educational and occupational outcomes; the stronger direct effects of cognitive ability; the associations of parents’ ability with their own socioeconomic attainments; and the genetic transmission of cognitive ability and other traits relevant to social stratification from parents to their children.