钻孔灌注桩注浆群桩的承载力分析

工程中对钻孔灌注桩桩端注浆处理后的桩基承载力的确定往往是做单桩竖向承载力的静载荷实验,得到的实验结果是单桩竖向承载力,但在设计时由于单桩承载力不足而往往是按照注浆群桩进行设计,而注浆群桩和注浆单桩的承载的受力机理是有所不同。本文通过ANSYS有限元软件分析不同桩端土模量、不同桩间距大小和不同浆泡尺寸对注浆群桩的承载力的影响进行分析。     

中国海洋经济绿色全要素生产率测度及影响因素

本文利用熵值法构建了"资源与环境损耗指数",测算了资源环境双重因素下中国及沿海11地区的海洋经济绿色全要素生产率,基于面板数据Tobit模型考察了不同因素对海洋经济绿色全要素生产率的影响。结果表明:技术进步是中国海洋经济绿色全要素生产率增长的主要源泉,而技术效率和规模效率的作用并不明显;沿海地区海洋经济增长对资源依赖和环境污染的程度呈现出较大的差异性;海洋产业结构、专业技术水平、管理制度对经济绿色全要素生产率增长具有显著的正向影响,而工业规模具有显著的负向影响。     

不确定收益下SBOT项目特许期决策模型研究

SBOT(Subsidize in Building-Operate-Transfer)作为一种新的BOT(Build-Operate-Transfer)模式,在城市轨道交通项目建设中被推广采用。特许期是SBOT项目特许权协议中的一个关键决策变量。本文利用实物期权和不对称Nash协商理论,提出了一种新的特许期计算方法并依据此方法构建了轨道交通SBOT项目的特许期决策模型,其决策过程分为两步:首先,利用实物期权理论构建了不确定收益下公共部门和私营部门的投资决策模型,求解出特许期的可行域;在此基础上,以特许期为决策变量,结合双边议价机制发展了实物期权模型,构建了特许期的Nash协商模型,并求解出模型的均衡解。最后,对轨道交通SBOT项目特许期决策模型均衡解的性质进行了讨论。     

从文化-种族到地域主义:对河北胡化论的辨析和检讨

自陈寅恪先生首次从民族和文化角度出发,提出河北的文化与政治双重分立的观点之后,河北胡化说俨然成为研究唐代中期历史转折之一大确论。然而细究其说便会发现,河北胡化说作为一种带有一定主观色彩和人文精神的推论,在逻辑和论证方面都不能满足后续研究的要求。近20年来,学界对河北胡化说进行了以社会生活层面为核心的丰富和发挥,其思想趋势表现为弱化胡-汉二元价值的矛盾,转而以地域化为叙述重点。这就把对文化差异的讨论放到了地域史的范畴中,从而在更加微观的层面上深化了对这一问题的认识。     

课程改革对教师观念与教学行为的影响探析--基于甘肃省普通高中研究性学习实施现状的调查研究

课程改革能否取得效果,取决于教师能否对新课程的理念有深刻的认识,更重要的是教师能否把新课程的理念和目标转化为教师最终的教学行为。对甘肃省普通高中研究性学习课程实施现状的调查研究表明：一方面,随着课程改革的逐步推进,多数教师通过课程培训和自主探索实现了教育观念的转向;另一方面,教育改革的复杂性及其教师的现实处境,使多数教师的教学行为与新课程的要求有一定距离。教师自身的变革动力是推动教师教学行为改善的内在因素,而课程实践问题的解决,为教师教学行为改善提供了外部条件。课程管理者需不断提升对于课程改革的认识,帮助教师解决课程实践问题,使教师真正成为课程变革的动力,促使教师积极主动地改善教学行为,推动课程改革的深入发展。     

Advances in urinary protein biomarkers for urogenital and non-urogenital pathologies

The discovery of protein biomarkers that reflect the biological state of the body is of vital importance to disease management. Urine is an ideal source of biomarkers that provides a non-invasive approach to diagnosis, prognosis and prediction of diseases. Consequently, the study of the human urinary proteome has increased dramatically over the last 10 years, with many studies being published. This review focuses on urinary protein biomarkers that have shown potential, in initial studies, for diseases affecting the urogenital tract, specifically chronic kidney disease and prostate cancer, as well as other non-urogenital pathologies such as breast cancer, diabetes, atherosclerosis and osteoarthritis. PubMed was searched for peer-reviewed literature on the subject, published in the last 10 years. The keywords used were “urine, biomarker, protein, and/or prostate cancer/breast cancer/chronic kidney disease/diabetes/atherosclerosis/osteoarthritis”. Original studies on the subject, as well as a small number of reviews, were analysed including the strengths and weaknesses, and we summarized the performance of biomarkers that demonstrated potential. One of the biggest challenges found is that biomarkers are often shared by several pathologies so are not specific to one disease. Therefore, the trend is shifting towards implementing a panel of biomarkers, which may increase specificity. Although there have been many advances in urinary proteomics, these have not resulted in similar advancements in clinical practice due to high costs and the lack of large data sets. In order to translate these potential biomarkers to clinical practice, vigorous validation is needed, with input from industry or large collaborative studies.Key words: urine, protein, biomarker     

Explaining organizational knowledge creation with a knowledge maturing model

Social media challenge knowledge management because of encouraging conversations, networking and participation in more distributed, diverse and dynamic ways of knowledge development and increasingly important individuals’ interests driving them. Hence, we need to understand the complex relationships between different qualities of knowledge developed in informal and formal processes as well as for overcoming misalignments in routines, tools and infrastructures supporting organizational knowledge creation. This paper contributes a maturation perspective towards explaining organizational knowledge creation and presents a knowledge maturing model, which is grounded in organizational practice and validated with qualitative and quantitative empirical and design studies. The results describe how characteristics of knowledge and support by IT change between phases of knowledge maturing. Our findings confirm theories of organizational knowledge creation with respect to expanding scopes from individuals through communities to organizations moving from interest-driven knowledge exploration in informal contexts to goal-driven knowledge exploitation in formal contexts. The maturation perspective adds to our understanding that organizational knowledge creation is not simply a continuous process. Phases that emphasize changeability alternate with phases concerned with stability. Knowledge develops in contexts that need to switch multiple times between opening up for new knowledge and filtering relevant knowledge and between de- and re-contextualization.     

The relevance of intellectual capital disclosure: empirical evidence from Spanish universities

The reporting of intellectual capital (IC) in higher education institutions is of vital importance, mainly owing to the fact that knowledge is the main output and input in these institutions. Furthermore, the increasing social concern about establishing procedures of accountability and ensuring information transparency in public universities prompted us to consider the need to disclose information on their IC. In this study, we developed a questionnaire that was sent to members of the Social Councils of Spanish public universities in order to identify the intangible elements about which university stakeholders demand most information. It was also used to see which groups of universities have stakeholders who are more proactive to the disclosure of IC. Our results represent a starting point for public universities to identify the most commonly requested information about IC. Universities can then develop an IC report that fits their own characteristics and environment.