桥塞坐封过程仿真模拟研究

桥塞作为井下封层技术的关键设备,由于它施工工序少、周期短、卡封位置准确而得到了广泛应用。针对设计的可钻式非金属桥塞坐封过程开展模拟研究,涉及弹塑性材料接触、超弹性材料接触和非金属材料动态断裂的非线性动力学问题,利用有限元法建立该桥塞全尺寸模型和所有部件之间的广义接触关系,通过有限元模拟动态坐封过程获得桥塞各部件运动变形特性、桥塞与套管之间的密封特性和动态坐封力等数据,该桥塞坐封完成时,坐封机构部件轴向位移110 mm,坐封力约45 kN。模拟坐封也为进一步优化该型桥塞的结构和评估坐封性能提供了理论依据,对该型桥塞的推广应用奠定了基础。     

“宇宙文章”与“妖魔”：明代七子派的污名化

明代七子派的复古曾享有盛誉,“文学革命”兴起后,七子派被视为“妖魔”。陈独秀等人所倡导的“文学革命”是以七子派、桐城派作为“革命”对象,并将七子派符号化为旧文学的负面典型,断开了白话文学与七子派、桐城派的联系,试图建构白话文学的体系。对于“正统”文学,陈独秀、胡适充满焦虑,并努力将七子派打造成“摹拟”“抄袭”的典型,以此获得口诛笔伐的合法性。这种策略性的成功使原来占主导地位的“正统”文学让位于白话文学,七子派在哀怨声中消失在了新文学的大合唱里。     

试论司马光的经济思想

司马光的经济思想是保守的,但他的保守是建立在他对中华帝国深刻理解的基础上的。他主张开源节流,阐扬轻徭薄赋、黜奢崇俭、蓄积与常平的“富民”思想。针对日益严重的财政经济危机,他提出了一整套经济改革的主张。最主要的是他对传统社会经济运行规律和经济管理的深刻体认。     

Continuity and change in work-life balance choices

This paper explores the ways in which the work-life balance choices made by heterosexual couples differ in different generations, how such choices are gendered, and the extent to which 'individualization' provides an adequate conceptualization of the effects of social change on heterosexual couples. It argues that processes of individualization need to be seen in the context of changing social institutions, and that it is the de-institutionalization of 'the family' and the life course that is leading to a de-gendering of work-life balance choices. The paper draws on findings from a restudy of the family and social change and a study of the gender dimensions of job insecurity both of which were carried out in the same geographical location. The studies provide evidence of generational change in work-life balance choices and increasing occupational differentiation between heterosexual partners. This leads to a situation where increasingly choices are made which blur gendered boundaries and which has been made possible by a process of de-institutionalization of the male breadwinner family. Our findings support the contention that processes of individualization are more apparent amongst younger than older generations and that, because of changes external to the family, there is more negotiation and pragmatism amongst younger generations about work-life choices.     

制度文明建设思想对我国和谐社会建设的意义

“]国家是文明社会的概括”,强调国家建设的文明属性,其意义在于强调文明是人类社会要达到的有秩序、公平合理的高级发展阶段。以制度建设为核心,以体制建设为保障的制度文明建设思想对于我国和谐社会的建设具有重要的指导意义。     

存现句There的语义格定位

There-be存现结构深层次的语言特点一直吸引着英语语言学家作深入的研究。近年来,There-be仔现句得到汉语语言学家越来越多的关注。传统的分析认为,there对句子没有任何贡献,许多语言学家把there称为“虚义”(exp letive)成分。虚词there的研究伴随着生成语法理论的发展,不少重要的理论假设都直接涉及there的研究。围绕there解释的各种理论催生了许多新的理论假说。对there进行准确定位有助于正确认识存现句结构的本质,化简某些理论构建的复杂性。     

“一带一路”视阈下巴基斯坦向海湾地区劳务输出的影响与趋势

海湾地区是巴基斯坦最重要的海外劳务输出目的地,这是由特殊的地缘因素与经济互补性所决定的。海湾劳工给巴基斯坦经济社会提供了发展助力,也折射出巴经济社会存在的结构性问题。“一带一路”建设的推进,尤其是“中巴经济走廊”的实施为巴基斯坦提供了造血能力,将有助于巴基斯坦经济成功转型,增加就业机会,提高自身吸纳劳动力的能力,减少向海湾的劳务输出。     

An elastic-net penalized expectile regression with applications

To perform variable selection in expectile regression, we introduce the elastic-net penalty into expectile regression and propose an elastic-net penalized expectile regression (ER-EN) model. We then adopt the semismooth Newton coordinate descent (SNCD) algorithm to solve the proposed ER-EN model in high-dimensional settings. The advantages of ER-EN model are illustrated via extensive Monte Carlo simulations. The numerical results show that the ER-EN model outperforms the elastic-net penalized least squares regression (LSR-EN), the elastic-net penalized Huber regression (HR-EN), the elastic-net penalized quantile regression (QR-EN) and conventional expectile regression (ER) in terms of variable selection and predictive ability, especially for asymmetric distributions. We also apply the ER-EN model to two real-world applications: relative location of CT slices on the axial axis and metabolism of tacrolimus (Tac) drug. Empirical results also demonstrate the superiority of the ER-EN model.     

一个极端的斯拉法主义者——萨缪尔森对劳动价值论批判的反批判

萨缪尔森是西方后凯恩斯主义主流经济学的头面人物,在世界范围的经济学界,他不仅以新古典综合理论而著称,他更以疯狂攻击和诬蔑马克思劳动价值论及其转形问题而扬名。在萨缪尔森发表的几篇攻击马克思劳动价值论和转形问题的文章中,1971年发表的《理解马克思的剥削概念:马克思的价值与竞争价格间所谓转化问题的概述》一文应该说具有一定的代表性。本文试图通过对该文的分析向世人说明,被西方资产阶级经济学界吹捧为学术大师的萨缪尔森,在价值理论上他不仅对马克思主义经济学常识一窍不通,甚至对普通的代数学知识也一无所知,是一个极端的斯拉法主义者。