证券市场的泛信息不对称状态及其优化--基于信息传递流程的分析

证券市场是一个对信息高度依赖的市场，也是一个“泛信息不对称”的市场，“提高信息透明度”已经成为各国证券监管机构的重要监管目标。泛信息不对称状态产生于信息传递的各个环节，并在不同的环节受到不同因素的影响和制约。本文将信息的传递分成四个阶段，分析了在不同的传递阶段信息不对称产生的诱因，并针对这些诱因提出了相应的优化措施。通过这种信息传递流程的分析方法，不仅可以深化对证券市场信息不对称状态的认识，还可以为“泛信息不对称状态”的优化提供新的策略。     

共词分析聚合研究领域的表面效度研究:基于自然语言处理

为考察共词分析在研究领域聚合中的有效性,本研究以1988年～2017年三十年间发表且收录于WoS(Web of Science)数据库的计算机科学、地理学、数学、应用化学和应用物理学等五个学科的标题、摘要和关键词为分析对象,对不同分析单元下所聚合的研究领域的表面效度进行了检验。研究发现,关键词在研究领域聚合中具有相对最高的表面效度,摘要和题名的效度则相对较低。然而,本研究也发现,科学计量领域现有聚类指标和工具所聚合的研究领域缺乏区分能力且各种指标均存在着一定的效度风险。本研究的发现对于丰富科学计量领域关于研究领域聚合有效性的认识具有重要理论意义。     

中文科技期刊应加强服务性建设

针对中文期刊高水平稿源外流的现状,提出了可以通过加强服务性建设来增强期刊的吸引力。从稿件处理流程入手,提出了加强前期、中期和后期服务的策略建议,以提高期刊稿源的吸引。通过有效的服务性建设,将有助于我国的中文科技期刊提高对优质稿源的吸引。     

科学过程技能的性别差异

本研究运用表现性评价方式评价科学过程技能,结果发现男女学生的总体科学过程技能不存在差异,但除找出变量之外,其他各过程技能均存在差异。最后,针对这种性别差异讨论了相应的教学和评价建议。     

Development of a chemically defined medium for Planctopirus limnophila to increase biomass production

BackgroundPlanctomycetes is a phylum of biofilm-forming bacteria with numerous biosynthetic gene clusters, offering a promising source of new bioactive secondary metabolites. However, the current generation of chemically defined media achieves only low biomass yields, hindering research on these species. We therefore developed a chemically defined medium for the model organism Planctopirus limnophila to increase biomass production.ResultsWe found that P. limnophila grows best with a 10 mM sodium phosphate buffer. The replacement of complex nitrogen sources with defined amino acid solutions did not inhibit growth. Screening for vitamin requirements revealed that only cyanocobalamin (B12) is needed for growth. We used response surface methodology to optimize the medium, resulting in concentrations of 10 g/L glucose, 34 mL/L Hutner’s basal salts, 23.18 mM KNO₃, 2.318 mM NH₄Cl and 0.02 mg/L cyanocobalamin. The analysis of amino acid consumption allowed us to develop a customized amino acid solution lacking six of the amino acids present in Aminoplasmal 10%. Fed-batch cultivation in a bioreactor using the optimized medium achieved a final ΔOD₆₀₀ of 46.8 ± 0.5 after 108 h, corresponding to a cell dry weight of 13.6 ± 0.7 g/L.ConclusionsThe optimized chemically defined medium allowed us to produce larger amounts of biomass more quickly than reported in earlier studies. Further research should focus on triggering P. limnophila biofilm formation to activate the gene clusters responsible for secondary metabolism.How to cite: Kruppa OC, Gerlach D, Fan R, et al. Development of a chemically defined medium for Planctopirus limnophila to increase biomass production. Electron J Biotechnol 2021;54. https://doi.org/10.1016/j.ejbt.2021.09.002.     

谈高职院校计算机专业毕业论文（设计）的改革

当前,我国高校毕业论文（设计）存在抄袭、拼凑成风的不良现象,结合高职院校计算机专业毕业论文指导工作的现实情况,有针对性地提出了基于工作过程的改革方法,在实践中让学生自主选题,形式上不拘一格,并且规范写作与指导流程,使得毕业论文（设计）真正地为学生服务。     

教师职业研究的新视角——情绪工作研究探析

首先从情绪工作的定义、特征出发分析教师是属于高情绪工作者,之后阐述情绪工作的调节策略以及影响调节策略的相关因素,以期为研究教师职业提供一个新视角。     

A multi-criteria approach for the group assessment of an academic course: A case study

The present paper aims at proposing a structured methodology to evaluate the results of an academic training course addressed to postgraduate students. The evaluation process intends to identify the efficacy of an education course by means of a comparison between the general objectives and the results expected by the students. Since the evaluated aspects by the students, detected by means of questionnaires, are both quantitative and qualitative, the proposed methodology is based on the analytic hierarchy process (AHP). In order to facilitate the evaluation process, answers have been modelled by means of linguistic variables. In particular, different evaluation scales have been used and each one is characterized by different levels associated to different fuzzy numbers.     

皖南二县五村农民收入与土地关系调查

利用皖南两县五村社会调查资料,分析各类农民家庭的经济状况及其在收入和生活水准上的差别;考察农民对土地承包权的态度及其影响因素。结果表明,官方有关农民收入的数据,存在着低估的可能;农户不愿意放弃土地承包权的占大多数,但是如果国家征收土地时满足农民的一定要求,他们仍愿意放弃或出让。