铝合金抽油杆柱深抽的初步研究

机抽井深抽是恢复油井产量行之有效的措施，为解决钢质杆深抽时驴头负荷、曲柄扭矩和杆柱应力过大的问题，我国西部某油田提出了使用铝合金抽油杆的设想。本主根据抽油杆柱设计理论导出了深抽杆柱各级下入深度的公式；对不同工艺参数配合下的计算结果进行了对比分析，对铝合金抽油杆柱用于深抽的可行性进行了初步研究。     

地域文化研究的开拓创新

《阴山文化史》是地域性文化史研究中一部值得关注的开拓创新学术著作。本书在学术界第一次以阴山这一特定地域的文化史作为研究对象,提出了"阴山文化"这一学术范畴并对其进行了全面、系统、深入的论述,构建了阴山文化史研究的崭新体系。     

汽车产业链演化机理及影响因素研究

汽车产业链是汽车产业重要组织模式,其演化与整合升级对汽车产业发展具有重要意义。本文从汽车产业链演化动因出发,重点分析汽车产业链演化过程,分析归纳影响汽车产业链演化影响因素。在此基础上,以东北地区汽车产业为例,运用主成分回归分析方法对汽车产业链演化影响因素进行实证检验,结果表明各影响因素与东北地区汽车产业链演化发展水平存在不同方向和程度的相关关系。     

《朝鲜古写徽州本朱子语类》的传播过程考订

《朝鲜古写徽州本朱子语类》是研究朱子学的一个重要善本,然自1982年出版以来,始终未明其传播过程。本文旨在厘清其传播源流:古写本的底本,即《徽州刊朱子语类》当于成化十七年至十八年(1481-1482)传入朝鲜,于正德十年(1515)刊行于世。在壬辰倭乱或丁酉再乱之时毁损,仅余孤本传入日本,藏于尾张藩文库,于1639前后为红叶山文库珍藏,又于明治维新年间(1867-1889)流入书肆,辗转为楠本正继所得,最后捐献于九州大学图书馆。     

浅析我国数字图书馆的发展

随着经济与科技的迅猛发展，我国图书馆馆藏有了突破性的发展，数字图书馆使图书馆的办馆模式和性质从根本上发生了变化，由独立办馆变成了馆际合作，由藏书借阅变成了为读者服务。同时面临新的形势和瓶颈，为了适应时代发展的需要，我们只有让各个系统条件共同发挥作用，来实现数字环境下的信息资源建设。     

基于最近邻分析的空气质量时空数据异常点识别

空气质量数据具有在时间上连续、空间上相关的特点,这提高了异常点识别的难度.本文提出在时间维度上运用移动平均法,在空间维度上运用反距离加权法对观测值进行预测并求残差的解决思路,从而将时空数据的异常点识别问题转化为二维残差值的异常点检测问题.通过仿真验证表明新方法具有良好的检出力.最后将新方法应用于北京市实际观测数据,取得了满意的识别效果.     

Why is the History of Heterosexuality Essential? Beliefs About the History of Sexuality and Their Relationship to Sexual Prejudice

Heterosexual people with more positive attitudes to lesbians and gay men generally believe that homosexuality is immutable, is not a discrete social category, and that homosexuality exists in all cultures and time periods. Equivalent beliefs about heterosexuality and beliefs about components of sexuality have been less often researched. 136 people with diverse sexualities described heterosexuality as more universal across history and culture than homosexuality (Study 1). 69 heterosexual-identified participants similarly believed that love, identity, behavior, and desire were more historically invariant aspects of heterosexuality than of homosexuality (Study 2). Less prejudiced participants thought all components of homosexuality—except for identity—were more historically invariant. Teasing apart beliefs about the history of components of heterosexuality and homosexuality suggests that there is no “essential” relationship between sexual prejudice and the tension between essentialist and constructivist views about the history of sexual identity.     

The Health Benefits of College Education in Urban China: Selection Bias and Heterogeneity

China has undergone a rapid expansion in higher education since the late 1990s. Drawing on a recently collected nationwide representative data, the current study makes contributions to the understanding of the health benefits of college education in urban China. Using propensity score matching to deal with potential selection bias, the results of the current research suggest that higher education attainment can significantly promote people’s self-rated health status, with the control for a series of demographic and socio-economic characteristics. Moreover, this research also highlights the heterogonous treatment effects: those who are more likely to attend college benefit less from the health returns to higher education than those who are less likely to go to college, lending support to a negative heterogeneous treatment effect pattern. Finally, we also examine the cohort difference in the heterogeneous treatment effect and it turns out that the negative pattern mainly takes place among the cohorts born after 1981, the generations who experienced the expansion of higher education.