异构数据库数据迁移研究

数据迁移是指将一种数据环境中的数据根据需要进行某种转换,导入另外一种相异或者相同的数据环境中。异构数据库迁移是指将数据库管理系统中不同的,或者数据结构、数据组成与定义相异的数据之间尽量进行等价、无损的数据转移。通过文献案例和理论研究对异构数据库的迁移技术进行了分析,提出了一种以Java为编程语言和数据库结构JDBC为基础的异构数据库管理系统的迁移方法,并通过实验证实了此方法的有效性。     

图书馆数字资源长期保存迁移技术分析

数字资源长期保存是通过对数字信息生命周期的管理,实现对数字对象的长期可生存能力、可呈现能力和可理解能力的维护,迁移技术已被认为是一种有效的长期保存策略。但由于其涉及诸多方面,除迁移策略选择、迁移实施、迁移途径设计等技术性问题外,还涉及到很多非技术性问题,如费用问题、版权问题、安全性等问题,目前尚无大规模的实施案例。本文在介绍数字资源长期保存迁移概念的基础上,通过对迁移过程的风险和图书馆数字迁移对象模型进行分析,进而提出数字对象迁移模型和迁移流程。最后,对目前主流迁移工具进行分析。相信对于"图书馆数字资源长期保存迁移技术分析"的研究,将对数字图书馆长期保存系统的建设起到抛砖引玉的作用。     

叙述者和穆斯塔法的文化定位——《北迁的季节》后殖民主义解读

《北迁的季节》反映了殖民主义对被殖民地的深刻影响乃至西化,导致被殖民者一直生活在纠结中,他们既无法摆脱西方对其的殖民化,也无法回到自己的故土,从而找不到自己的归属,内心的矛盾使得他们像被抛弃的婴儿。因此,只有死亡才是他们唯一能够解脱自己的方式。穆斯塔法.萨义德和叙述者就是两个典型的殖民化的牺牲者。他们到死都没能摆脱殖民化,也没有准确找到自己在社会中的文化定位。     

Degradation of Emerald green in oil paint and its contribution to the rapid change in colour of the Descente des vaches (1834–1835) painted by Théodore Rousseau

Abstract

Descente des vaches (1836) by Théodore Rousseau in the Mesdag Collection in The Hague is barely readable and its paint layers are in poor condition. The surface of the painting is strongly deformed and cracked, the whole painting has darkened and especially the greens have lost all or most of their colour resulting in brown passages. Large passages of the painting that were painted with multiple thick and medium-rich layers have darkened dramatically. This paper proposes that the degradation of Emerald green (Cu(C₂H₃O₂)₂·3Cu(AsO₂)₂, copperacetoarsenite) – the main green pigment used in this painting – is a significant factor in the cause of the darkening. Electron backscatter images reveal that the Emerald green particles are shown different degrees of degradation: from partially to completely disintegrated. Elemental maps show that arsenic is distributed throughout the paint cross section, with relatively higher concentrations around iron- and aluminium-containing particles, and in the varnish layer. Imaging-Fourier-transform infrared microscopy detects copper soaps in the degraded Emerald green-containing layers. Analytical data from four paint cross sections strongly suggest that Emerald green reacts with free fatty acids derived from the binding medium forming copper soaps and mobile arsenic-based species. Chemical laboratory experiments fully support this hypothesis. Emerald green and palmitic acid in chloroform form copper palmitate and arsenic trioxide (arsenolite, cubic) under room temperature and normal light conditions. The degradation of Emerald green particles in Descente des vaches has resulted in a loss of light-reflecting surfaces and in newly formed compounds in the paint, both contribute to the colour change from green to brown.     

Reading and writing between different worlds: Learning,literacy and power in the lives of two migrant domestic workers

Over the last decades, studies exploring women's literacy have highlighted the way in which literacy practices are embedded within social norms and structures of power. This article draws on research with a group of female migrant domestic workers from Nepal who attended literacy support sessions at the Migrant Resource Centre in London. It explores the way in which their engagement with literacy and learning interacts with the gendered relations of power they experience as they move between different transnational spaces and social fields. It suggests that a consideration of the opportunities and constraints that they experience as migrant domestic workers is critical for understanding their engagement with literacy, and for thinking about possibilities for greater gender justice in the lives of migrant domestic workers like them.     

“Brighter the moon over my home village”: Some patterned ways of speaking about home among rural–urban migrant workers in China

Drawing on a social constructionist approach and Philipsen's theoretical framework of cultural communication, this study examines how rural–urban migrant workers in China construct the meaning of home in their communication about migration. Interviews with migrant workers and participant observation of their everyday conversations reveal that migrant workers frequently evoke a cultural code of home attachment and actively construct a political code of displacement to construe their prolonged liminality between the city and the countryside. Implications for studying the use of culturally specific and politically situated discursive practices to address common challenges of displacement are discussed.     

运动素质的迁移研究与影响因素分析

根据运动技能迁移原理发现在体育运动中运动素质之间也有迁移的现象,本文运用文献资料法、逻辑推理法,提出运动素质迁移的理论依据,从生理与心理的角度阐述了运动素质迁移的若干影响因素,为体育今后科学的训练与教学提供理论参考。     

Literacy as social reproduction and social transformation: The challenge of diasporic communities in the contemporary period

This article reviews literature on social reproduction in education, discusses the decline of the paradigm, and argues for its continuing relevance. It examines reproductive and transformative aspects of cross-linguistic literacy practices involving young people from three diasporic communities in the United States, presenting multi-leveled analyses that investigate what is reproduced or transformed by situated literacy practices and how institution-level processes shape such practices. It argues that such scale-sensitive analysis provides insight into new reproductive processes, involving conflicts over language in education, that are themselves rooted in new forms of class conflict rooted in global system dynamics of social polarization.     

试论古代彝族在黔西北的迁徙发展

彝族在黔西北地区有数千年延续不断的分布历史可追溯,在彝族早期的历史中,各部落氏族为寻找迁移的生存环境,不断的往返迁徙,其延续不断的分布历史证明,黔西北地区既是彝族的居住地之一,更是彝族的发祥地之一。     

1998-2007年国内外大学图书馆岗位变迁对比分析

通过问卷调研,对比分析1998-2007年国内外大学图书馆岗位的变化及新岗位的设置情况,进而总结大学图书馆岗位的变迁规律及演化框架,为我国大学图书馆优化岗位设置提供相关建议。