套料钻在大直径深孔加工中的应用

通过实例对套料钻的结构、套料加工工艺进行阐述,并与传统的扁钻对比,说明套料加工对于大直径深孔加工是一种高效率、低成本的加工方法.     

大型公共图书馆与社区图书馆的合作

本文在明确大型公共图书馆与社区图书馆范畴的基础上，针对这两类图书馆合作建设的共赢效果，探讨了两者合作建设的三种形式，并提出合作建设需注意的问题。     

山西省煤炭资源开发与经济发展关系的实证研究

资源开发与经济发展之间的关系存在着不同的争论,传统经济学理论强调丰富的自然资源对区域经济增长的正面作用,而20世纪90年代兴起的资源诅咒论正好相反。本文以煤炭资源丰富的山西省为例,应用面板数据模型对煤炭资源开发与经济发展之间的关系进行了实证研究。结果表明,山西省煤炭资源开发对经济发展具有显著正向影响,其中大型煤炭企业资源开发对于地区经济增长具有促进作用,中小型煤炭企业资源开发对于地区经济增长无显著影响。因此,坚持以煤为基、多元发展,进一步巩固能源基地的战略地位,同时积极开展煤炭资源整合和企业兼并重组对于促进山西经济健康持续发展具有重要意义。     

Survivin在乳腺癌及大肠癌中表达的临床意义

目的：探讨大肠癌、乳腺癌中生存素的临床意义。方法：收集大肠癌68例,乳腺癌69例,利用SABC免疫组织化学方法,检测Survivin表达状况。结果：大肠癌和乳腺癌中Survivin阳性率分别为63.24%和42.03%,Survivin在大肠癌低分化组和深浸润组阳性率明显高于浅浸润和高分化组;在浸润型乳腺癌组和有淋巴结转移组Survivin阳性率明显增高。结论：Survivin表达与癌组织生物学特性有关;检测癌组织中Sur-vivin表达可以提示预后及指导靶向治疗方案的制定。     

Rapid Feedback Assessment Methods: Can We Improve Engagement and Preparation for Exams in Large-enrollment Courses?

Scratch-off immediate feedback assessment technique (IF-AT) forms and classroom response systems (clickers) can increase student engagement and interaction and help students prepare for exams by indicating the type and level of questions they will encounter. We used the IF-AT throughout the semester in three sections of a lower-division biology class; in two, students worked on IF-AT questions in small permanent groups, and in one, students alternated between IF-AT and clickers each week. At the end of the semester, students answered surveys about instant feedback techniques. Students appreciated prompt feedback on their understanding of course material, enjoyed the group interaction and opportunities to learn from each other, and continued to have positive perceptions of instant feedback activities and to take them seriously throughout the semester. While appreciating the versatility of clicker questions, we find that the ease of use, low cost, effectiveness, and improved classroom climate of the IF-AT method are particularly commendable.     

大股东、CEO薪酬激励与企业创新

选取2009—2015年上市公司为研究样本,考查薪酬激励缓解大股东对企业创新的负面影响的中介效应。Logit、Tobit模型与回归模型均发现大股东对企业创新的负面影响,CEO薪酬激励发挥部分中介效应,中介效应占总效应28%。CEO薪酬激励是非国有企业样本的完全中介变量,CEO薪酬是国有企业样本的部分中介变量,其持股未产生中介效应。研究结论表明提升上市公司薪酬激励水平是缓解大股东对企业创新的负面影响的重要途径,为治理"一股独大"提供经验证据与研究思路。     

中国八大经济区工业企业技术创新效率及其影响因素研究

本文以中国八大经济区大中型工业企业的技术创新效率为研究对象,应用SE-DEA视窗分析和计量分析技术展开实证研究。研究结果表明:八大区域大中型工业企业技术创新效率在2001—2011年期间的均值存在区域差异,从高到低依次为南部沿海、东部沿海、北部沿海、西南地区、长江中游地区、东北地区、黄河中游、西北地区;从长期趋势看,效率值变化不稳定,忽高忽低;政府创新资金资助、国有产权比例对企业技术创新效率有负面影响,高技术产业技术溢出、企业规模对企业技术创新效率有显著促进作用。     

Isolation and identification of Sclerotinia stem rot causal pathogen in Arabidopsis thaliana

A new stem rot disease is found to occur naturally on Arabidopsis plants in greenhouses of Fuzhou, China. In order to identify its pathogen, we conducted a series of fimgal isolation and purification, plant reinoculation, and ascus and ascospore induction from the sclerotia. The isolate caused typical water-soaked lesions after reinoeulation and produced sclerotia both on Arabidopsis plants and culture medium plates, and the sclerotia could be induced to produce discal apothecia and 8 binucleate ascospores per ascus. These disease symptom and fungal morphology data revealed that the fungus Sclerotinia sclerotiorum (Lib.) de Bary was the pathogen for Arabidopsis stem rot. To confirm this, we further amplified its large subunit ribosomal DNA (LSU rDNA) by polymerase chain reaction (PCR), and compared the sequence with the known LSU rDNA sequences in GenBank. The results show that the sequence shares the highest identities with the LSU rDNAs of different S. sclerotiorum strains. Taking all these data together, we concluded that the fungus that caused the Arabidopsis stem rot is S. sclerotiorum (Lib.) de Bary. This is the first report that Arabidopsis is naturally infected by S. sclerotiorum.     

Large eddy simulation of the gas-particle turbulent wake flow

To find out the detailed characteristics of the coherent structures and associated particle dispersion in free shear flow, large eddy simulation method was adopted to investigate a two-dimensional particle-laden wake flow. The well-known Sub-grid Scale mode introduced by Smagorinsky was employed to simulate the gas flow field and Lagrangian approach was used to trace the particles. The results showed that the typical large-scale vortex structures exhibit a stable counter rotating arrangement of opposite sign, and alternately form from the near wall region, shed and move towards the downstream positions of the wake with the development of the flow. For particle dispersion, the Stokes number of particles is a key parameter. At the Stokes numbers of 1.4 and 3.8 the particles concentrate highly in the outer boundary regions. While the particles congregate densely in the vortex core regions at the Stokes number of 0.15, and the particles at Stokes number of 15 assemble in the vortex braid regions and the rib regions between the adjoining vortex structures.     

Student evaluation of audience response technology in large lecture classes

In the past few years, audience response technology (ART) has been widely adopted on college campuses, and is especially popular among instructors of large lecture classes. Claims regarding ART’s benefits to students have received only limited empirical evaluation, and prior studies exhibit methodological limitations. The current study provides a multi-dimensional evaluation, utilizing a newly-developed measure, the Audience Response Technology Questionnaire (ART-Q). Data were provided at three points during a semester by undergraduate students (n = 854) who used ART in three large lecture university courses. Results indicate moderately positive evaluations of ART on some dimensions (e.g., ease of use, impact on attendance), with less positive evaluations on others (e.g., influence on preparation for class). These evaluations showed some variability across time of semester and course, but were not substantially affected by gender, ethnicity, or year in school. Findings are discussed with respect to the need for future research on instructors’ techniques for using ART and their influence on student perceptions and outcomes.