The Age Difference Between Spouses: Variations among Developing Countries

Sub-national and cross-national variations in the age difference between spouses are investigated with data from the World Fertility Survey relating to 29 developing countries. Substantial variation within and between countries is evident. Analysis suggests that the relative age of prospective spouses is a factor taken into account in the marriage market. Observed variation in the age difference, within and between countries, cannot be explained as the simple by-product of the random matching of independently determined distributions of men's and women's ages at marriage. Certain age differences are avoided, others chosen more frequently. Preferred age differences appear to differ in the societies studied, however, and this variation can be directly interpreted in terms of two sets of factors: kinship structure and women's roles. The analysis also suggests that demographic determinants of the age difference, in particular age constraints on the pool of possible matches, are of less importance in explaining societal variations than are social structural factors.     

稠油油藏注蒸汽储层热伤害规律实验研究

针对稠油油藏注蒸汽过程中储层的热伤害问题，研究了稠油油藏热采过程注入的高温、高pH 热流体对储层 渗透率的影响，研究中利用正反向流动实验方法，研究了高温冷凝液注入疏松砂岩后引起的微粒运移作用及储层渗透 率的变化特征；并利用储层矿物的水热反应实验，分析了疏松砂岩油藏注蒸汽开发过程中的微粒运移机理。实验结果 表明，注蒸汽过程中，稠油油藏储层渗透率随温度及pH 值的升高而降低。高速流动的蒸汽及冷凝液造成储层内固相 微粒的运移及滞留，使储层非均质性进一步加剧；同时，高温、高pH 的蒸汽冷凝液既促使黏土矿物发生膨胀又造成储 层矿物发生溶解与转化，从而进一步加剧了稠油油藏疏松砂岩储层的储层热伤害。     

The impact of migration on the well-being of transnational families: new data from sending communities in Mexico

We present results from a new study of the effects of migration to the USA on the well-being of transnational families in high emigration communities within Mexico. Our survey measured the well-being of family members in a variety of domains: economic, health, education, and child development for a representative sample drawn from high migration municipalities. Compared to those with no recent emigrants to the USA, Mexican households sending non-caregivers to the USA appear to gain economically without contributing to problems faced by children. However, when family caregivers migrate to the USA, the remaining members in Mexico struggle to meet the family's needs and children are more vulnerable to educational, emotional, and health problems. Children in households where a caregiver migrated were more likely to have frequent illnesses (10% vs. 3%, p<0.0001), chronic illness (7% vs. 3%, p=0.011), emotional problems (10% vs. 4%, p=0.006), and behavioral problems (17% vs. 10%, p=0.018) compared with children in households where the migrant was not a caregiver. Research, policy, and program implications of these findings are discussed.     

劳动力外出务工对农户农业商品化率的影响——基于江西省四个县农户调研的实证分析

农村劳动力向非农产业和城镇转移是提高农业商品化水平的必然要求。本文使用近期的农户调研数据考察了家庭成员外出务工对农户农业商品化率的影响。计量分析表明，从整体上看，务工户与非务工户之间的农业商品率不存在显著差异。我们将农业生产按要素密集程度进行划分后，才发现成员外出务工所带来的潜在影响，务工户粮食生产的商品化率有了提高，而其它农业生产的商品化率则显著下降了。此外，我们还发现，农地市场及农村信贷市场发育对农户农业商品化发展具有重要作用。     

Ambivalences of the emotional logics of migration and family reunification: emotions,experiences and aspirations of Bangladeshi husbands and wives in Italy

This article analyses the relational and emotional logics of migration, separation and reunification of Bangladeshi families in Italy. Migrant husbands are separated from their wives, with whom they have had little family life due to their migration, and seek family reunification. Wives’ migration due to family reunification, however, means separating them from their familiar environments and social networks. For this reason, some wives press for onward migration to the UK, where they hope that a larger Bangladeshi community and more social and cultural opportunities may provide a more fulfilling life compared to what they experienced in Italy. However, this means uprooting their husbands once again. The article observes the emotionally divergent dimensions among men and women as an element that can transform and redefine biographical projects and the migration trajectories in Europe of Bangladeshi families in Italy.     

Towards the elsewhere: discourses on migration and mobility practices between Morocco and Italy

The objective of this article is to analyse the preparation process of young Moroccan migrants intended to migrate to Italy. My focus is on the personal and collective formulation of their desire to leave and on concomitant action taken to bring about these aspirations; highlighting the complexity of the imagination, which migration – and expected return – entails. A second point of interest is the agency exerted by such youth, as they prepare for departure; even when they have not yet physically left the country. In addition, my observation is focussed on networks emerging as a result of having to deal with state-imposed, migration restrictions, as well as with the politics of humanitarian agencies and NGOs. I argue that these aspiring migrants project themselves into the future and act in accordance with what they long to become. They shape themselves as mobile subjects through a process of self-making to overcome the above-mentioned constraints.     

Flows and Cohesion: Balancing Capabilities Across an Expanded Union1

Until recently the flow of skilled workers to established centres from more peripheral regions was seen as a ‘brain drain’, implying a one‐way and permanent loss of skilled labour. However, increasing mobility and connectivity permits more complex traffic between more and less advanced locations. With the emergence of a global economy dependent on flows of material and intellectual capital, the notion of ‘brain circulation’ has gained prominence. Understanding the potential benefits of migration to both donor and recipient economies must move beyond financial remittance to social remittance. As connectivity increases, both become capacity‐building resources. This article discusses the impact of a combination of greater physical mobility and electronic connectivity on the dual objectives of social cohesion and technical leadership being pursued through the policies of the European Commission.     

回族流迁人口城市适应过程研究的理论探讨

民族迁移者在城市接受城市化和现代化“洗礼”的过程比较一般农民工的适应。由于加入了民族文化、民族侍统与民族意识的变量。显得更复杂、更丰富。成为当前城市面临的焦点问题。由于回族是我国城市化程度最高的少数民族。且其有着极强经商观念、民族意识。独特的民族宗教文化与饮食、婚丧、居住习俗，因此关注回族迁移人口的城市适应无疑具典型性和突出的现实意义。从回族迁移人口的城市适应的重要性出发。通过国内外研究进展的分析和述评，提出新时期城市化背景下回族流迁人口城市适应过程研究的思路：探讨研究的技术路线、研究方法与研究内容，包括提取城市适应的关键阻碍因素分析，进行城市适应的多维层面和时序过程分析。建立评价指标体系，定量评判城市适应的水平。并籍此提出针对性的城市适应调控策略。从而为促进城市民族工作、建立城市和谐民族关系与和谐城市社会提供理论与实践指导。     

Immigration: Not a Solution to Problems of Population Decline and Aging

Population and Environment - This article is a synopsis of a UN study, with emphasis on Italy and the United States. In March, 2000, the United Nations Population Division published a 143-page...     

开发性移民方针的提出与移民经济的发展

移民经济是在 2 0世纪 80年代中期 ,中国提出“开发性移民方针” ,并开始在三峡库区移民实践中逐渐形成、发展起来的一种经济现象或经济模式。移民经济是以“开发性移民方针”为指导的经济 ,是与社会主义市场经济相吻合的经济。三峡库区移民迁建的实践证明 ,移民经济有利于市场对移民资源进行重新配置和优化 ,有利于库区经济结构调整 ,是确保移民能够“搬得出 ,稳得住 ,逐渐能致富”的好形式 ,为最终解决三峡库区百万大移民这一世界性难题奠定了基础。展望移民经济的发展 ,可以预见 ,移民经济将逐渐成熟和规范 ,成为移民迁建的基本经济模式