空气中多种醛酮液相色谱法侧定的研究

本文研究了空气中多种醛酮的测定。目前国内仅对空气中甲醛的测定研究较多,国外报导的方法需用萃取、浓缩等一系列前处理过程,方法麻烦,易引入杂质造成污染。本文报导的方法系采用2.4—二硝基苯肼的甲醇强酸溶液吸收空气中醛酮直接注入液相色谱仪中进行分离测定。研究表明:本法分离效果好,重复性好,方法简便,速度快,测定的精密度和准确度符合微量分析误差的要求。     

高速铁路桩板结构承载板伸缩温度力研究

以某高速铁路桩板结构路基工程为背景，研究了桩板结构路基单联跨数对承载板体伸缩温度应力的影响规律，提出了桩板结构的结构布置原则；并根据桩板结构路基具体结构特征，推导了计算结构整体升降温引起的承载板体伸缩温度应力计算公式，该解析式与空间有限元法计算结果较好吻合，可方便地计算承载板的伸缩温度应力。     

中国基层社会治理政策变迁:演化、特征与经验——基于1978-2019年国务院政策文本分析

基层社会治理是国家治理体系的重要基础,中国基层社会治理政策随着经济社会发展在国家治理体系变迁中逐渐形成了独特的治理方略和中国经验。基层社会治理政策涉及的领域众多,为准确提炼出其核心内容,本文基于文献关键词的主题聚类结果,选取改革开放以来国务院关于基层社会治理的政策文本,通过发文时间、类型分布等计量分析中国基层社会治理政策变迁总体脉络。运用NLPIR汉语分词系统对政策标题进行文本深度挖掘,根据政策热点主题和政策变迁趋势等,将中国基层社会治理政策演化分为恢复重建阶段、宏观调控阶段、重心转移阶段和系统推进阶段。基于多源流理论探析政策变迁中问题源流、政治源流与政策源流的耦合特征,发现中国基层社会治理政策从形式、动力、主体和目标四个层面逐渐形成了突发性变迁与渐进性变迁并存、内生性驱动和外在性拉动结合、党依法执政与政府依法行政共同推进、坚持以人民为中心和问题为导向创新的中国经验,为发挥中国基层社会治理的政策优势提供有益借鉴。     

The disaster relief and social work after the Wenchuan earthquake in Mainland China

ABSTRACT

This paper mainly focuses on the development of disaster social work in Mainland China and the intervention of social work in disaster relief. Before the Wenchuan earthquake and in the initial stage of post-earthquake, disaster social work was mainly based on individual psychotherapy; from the earthquake to the year of 2012 in which post-earthquake recovery and reconstruction was completed, the disaster relief began to emphasise community building and integration, while the basic framework for disaster social work was also established. Social workers begin to explore the new mode of developmental and localised disaster social work. By combining with the practical experiences from disaster social work, this paper tries to highlight the dilemmas confronting disaster relief in Mainland China and put forward some corresponding countermeasures and suggestions, which could improve the future disaster relief system in Mainland China.     

Acceptance of automation manufacturing technology in China: an examination of perceived norm and organizational efficacy

Abstract

With a shift to more automation technology, social acceptance of technology plays an important role in the manufacturing sector. To what extent this occurs, and affects the adoption of technology, has been less researched, but is important in deciding how such technology is introduced, and the nature of the shift from labour-intensive manufacturing to automation. This research applies the revised technology acceptance model (TAM) to examine the impact of social and individual antecedents on the acceptance of automation manufacturing technology. Survey data are collected from 258 Chinese manufacturers. Results suggest that perceived norms significantly affect organizational intention to use automation manufacturing technology both directly and via perceived usefulness; organizational efficacy explains the intention to use via mediating effect of perceived usefulness and perceived ease of use. This research is one of the first extending and applying TAM from individuals to organizations.     

首都第二机场建设与航空人才需求调研

首都第二机场的建设已成定局,由此而引起的大量人才需求是各层次学校所关注的焦点。北京经济管理职业学院是否能抓住这一得天独厚的机遇,将是未来几年对北京经济管理职业学院的考验,因此根据近几年来对首都二机场建设的资料的收集和调研,了解了机场建设对航空人才的需求,为学院的发展提供了建设性的参考性意见。     

Elementary renewal theorems for widely dependent random variables with applications to precise large deviations

Abstract

On the basis of Wang and Cheng (J. Math. Anal. Appl. 384 (2011) 597–606), this paper further investigates elementary renewal theorems for counting processes generated by random walks with widely orthant dependent increments. The obtained results improve the corresponding ones of the above-mentioned paper mainly in the sense of weakening the moment conditions on the positive parts of the increments. Meanwhile, a revised version of strong law of large numbers for random walks with widely orthant dependent increments is established, which improves Theorem 1.4 of Wang and Cheng (2011 Wang, Y., and D. Cheng. 2011. Basic renewal theorems for a random walk with widely dependent increments and their applications. Journal of Mathematical Analysis and Applications 384 (2):597–606. doi:10.1016/j.jmaa.2011.06.010.[Crossref], [Web of Science ®] , [Google Scholar]) by enlarging the regions of dominating coefficients. Finally, by using the above results, some precise large deviation results for a nonstandard renewal risk model are established, in which the innovations are widely orthant dependent random variables with common heavy tails, and the inter-arrival times are also widely orthant dependent.     

我国农业传统文化与后现代农业发展的相关思考

现代农业的发展是以功利性为特征的,受经济目标的逐利影响,正逐渐步入生态困境。后现代农业发展阶段将出现农业生态观的原始回归,这将为我国农业传统文化功能的发挥创造机遇。我国后现代农业发展阶段应重视传统农业文化的诉求,挖掘本土农业文化资源,加强对外引文化的审视,提高农业自我创新能力。     

分段启动压力对宝浪油田驱动压差的影响

摘要：渗透率低于 10 mD 的特低渗储层与平均渗透率大于 20 mD 的低渗储层开发技术政策界限和开发方案制定等有很大的差别，渗透率越低，其启动压力成倍增加，这就影响了开发技术和方案的制定。应用分段启动压力梯度进行分段计算并进行对比，计算结果表明：用同一启动压力梯度计算的结果不符合实际情况，而应用分段启动压力梯度计算的结果更能很好地反映特低渗储层的实际情况；井距对较高渗透率的驱动压力计算影响并不大，但对于特低渗储层的驱动压力计算则影响很大。     

论近年来“长城小说”题材内容的新变

重点关注了《王白的长城》、《湖光山色》等几部"长城反思小说"与"长城乡土小说",通过叙事形态变化和社会价值变化两个层面,论述了近年来"长城小说"题材内容的变化。在叙事形态上近年来有关长城的反思小说和乡土小说引人关注;而在社会价值方面长城小说呼唤"生态意识"、"家园意识"的回归,引发了人们对环境的忧虑以及对古长城开发与保护的深思。