Recent breakthroughs of antibacterial and antiviral protective polymeric materials during COVID-19 pandemic and after pandemic: Coating,packaging, and textile applications

The global epidemic owing to COVID-19 has generated awareness to ensuring best practices for avoiding the microorganism spread. Indeed, because of the increase in infections caused by bacteria and viruses such as SARS-CoV-2, the global demand for antimicrobial materials is growing. New technologies by using polymeric systems are of great interest. Virus transmission by contaminated surfaces leads to the spread of infectious diseases, so antimicrobial coatings are significant in this regard. Moreover, antimicrobial food packaging is beneficial to prevent the spread of microorganisms during food processing and transportation. Furthermore, antimicrobial textiles show an effective role. We aim to provide a review of prepared antimicrobial polymeric materials for use in coating, food packaging, and textile during the COVID-19 pandemic and after pandemic.     

合作联盟资源集成计划一种新方法

合作联盟里，资源集成计划往往是联盟成员群体谈判博弈的结果。本以两人博弈为例，对联盟的资源集成计划给出一个谈判博弈模型，能够较好地模仿和反映合作联盟资源整合计划的制订过程。     

企业合作联盟成员位次竞争战略的Shapley值分析

针对Yanowitz和Bruckstein的二值字图像后处理算法存在的问题，提出了一种新的基于灰度期望值的后处理算法。实验结果表明，该算法能自动选取阈值、运算速度快、处理效果好，具有良好的噪声适应性。     

小型企业规模的有效性分析

在当代企业纷纷追求规模的不断扩大的同时，统计数据却显示企业平均规模不断下降的事实趋势。论根据数学、经济学与博弈论的有关理论对企业规模小型化的内在要求进行了探讨，分析的结论一致证明：粘型化规模在当代经济环境中是充分有效的。     

基于BP神经网络的企业未来获利能力智能综合评价

分析了相关分析——多指标综合评价法在确定企业未来获利能力方面的优点和不足 ;并在其基础上提出了基于 BP神经网络的多指标综合评价法 ;仿真试验证明了基于 BP神经网络的多指标综合评价法的有效性     

上市公司高管薪酬和企业业绩关系研究

本运用我国生物医药上市公司的经验数据考察高管薪酬与企业业绩的关系问题。研究的结果表明高管薪酬水平与企业业绩显正相关，高管团队内的薪酬差距也与企业业绩显正相关，而高管持股则与企业业绩负相关，在统计上不显。因此章建议企业应该考虑股权激励的成本和效果，改善股权激励制度。研究还表明企业追求的目标是规模最大化而不是股东净资产收益率最大化。     

共同治理结构下企业所有权配置的进化博弈分析

本文运用进化博弈论的方法,对有限理性的利益相关者在共同治理结构下参与企业所有权配置并达到纳什均衡的进化博弈过程进行分析,并通过算例说明了这是一个各方相互沟通和反复博弈的动态过程,逐步实现一致性的企业所有权配置的纳什均衡.     

气相色谱-质谱法分析土壤中神经性毒剂及糜烂性毒剂

建立了土壤中神经性毒剂及糜烂性毒剂GC—MS-SIM分析法，对土壤中6种毒剂的样品制备和二步萃取方法进行了研究；该法的回收率在80．7％～89．5％，6种毒剂在0．5～10mg/L范围内毒剂质量浓度和峰面积有良好的线性相关，方法检出限为4～20ng／g，该法适用于痕量化学战剂分析。     

从电子工业“脊梁”到全面开花的镓元素

镓是第一个根据化学元素周期律预言并在自然界中证实的元素，是室温下电导率和热导率均为最大的液态物质，镓在电子工业中得到了广泛应用，被誉为电子工业“脊梁”。近十几年来，镓的更多应用潜力被发掘出来，在电子工业、散热、增材制造、柔性机器、生物医学等领域均有重要的应用前景。     

Xylanolytic enzyme production by anAspergillus niger isolate

Production of xylanolytic enzymes by anAspergillus niger CCMI 850 isolate was investigated in batch cultures. The effect of the composition of a fermentation medium that did not include chemical inducers, on β-xylanase, β-xylosidase, α-l-arabinofuranosidase, and total cellulase activity was studied. With 4% xylan as the carbon source, about 65 U/mL of β-xylanase was obtained, whereas the total cellulase activity was undetectable, under the specified conditions. This β-xylanase activity represents the highest reported for a wild-type strain ofA. niger. The effect of pH and temperature on the activity of β-xylanase was studied. Partial characterization of the β-xylanase showed that with insoluble birchwood as substrate theK _m andV _max were 0.3 mM and 19 μmol/min, respectively. Aspects of using the crude β-xylanase preparation for applications in the pulp and paper industry were discussed.