Novel Catalyst Boosts Hydrogenation of CO_2 to Methanol:Higher Activity,Selectivity and Stability

正The hydrogenation of carbon dioxide (CO2) to methanol using a renewable energy-based "green hydrogen" source is one of the promising methods to alleviate energy crisis and achieve the goal of carbon neutrality.Recently,a group led by Prof.DENG Dehui from the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences (CAS),     

人工智能行业研发投入、创新策略与企业绩效——基于112家上市企业的实证研究

基于双元理论,以2015-2019年人工智能A股上市公司作为研究样本,研究我国人工智能企业的研发投入、创新策略与企业绩效三者关系.实证结果表明:探索式创新负向调节企业绩效(不显著),利用式创新正向调节企业绩效(不显著);加入调节变量研发投入后,探索式创新显著正向影响企业绩效,利用式创新则显著负向调节企业绩效.稳健性检验...     

盈利结构质量、核心盈利能力与盈利持续性——来自我国A股制造业上市公司的经验证据

盈利持续性是衡量盈利质量的重要手段,对投资者预测公司未来的发展前景具有重要意义.本文在我国新会计准则的财务信息披露模式下,对公司的盈利结构展开全面分析,构建出一套基于核心盈利能力的盈利结构质量评价指标体系,并以制造业A股上市公司2006-2008年的财务数据为基础采用因子分析法对该指标体系的有效性进行了实证检验.研究结果表明:公司的核心盈利能力越强,盈利结构质量越高,盈利的持续性就越好;而核心盈利能力较弱的公司,其盈利结构中非持续性的盈利项目往往占比过大,从而导致盈利的持续性较差.本文得出如下结论:核心盈利能力和盈利结构质量是影响盈利持续性的重要因素,文中提出的盈利结构质量评价指标体系对公司的盈利持续性具有较好的预测能力.     

我国核工业标准化研究的演进、热点与前沿——基于中国知网1980-2021年文献的科学计量分析

通过中国知网期刊数据库,采用CiteSpace可视化软件,运用文献计量、数理统计和文献阅读分析法,从知识图谱的角度对1980—2021年我国核工业标准化研究领域的期刊文献进行可视化研究,分析41年来该领域文献的数量、作者分布、机构分布、期刊分布等现状。研究发现：（1）该领域研究文献呈指数增长的发展趋势,核工业标准化研究所是该领域研究的核心机构;（2）我国核工业标准化研究经历了起步、巩固和拓展三个阶段,研究内容和成果不断丰富,紧贴我国核工业科研生产实际;（3）研究热点主要归为五个领域;（4）后续研究关注重点主要集中在八个方面;（5）该领域研究还存在盲区和薄弱领域。     

Novel antimicrobial activity of a dichloromethane extract obtained from red seaweed Ceramium rubrum (Hudson) (Rhodophyta: Florideophyceae) against Yersinia ruckeri and Saprolegnia parasitica,agents that cause diseases in salmonids

BackgroundEnteric red mouth disease and Saprolegniasis, which are caused by the bacteria Yersinia ruckeri and the oomycete Saprolegnia parasitica, respectively, are important illnesses that affect salmonid farming. Sanitary problems in farms are addressed by the prevention of disease outbreaks or by the treatment of diseases with chemicals. Environmental and governmental restrictions, toxicity and high treatment costs limit the use of drugs. Marine organisms, such as algae, sponges and corals, have developed an antimicrobial defense strategy based on the production of bioactive metabolites. Among these organisms, seaweeds offer a particularly rich source of potential new drugs. Hence, many pharmacologically active substances have been isolated from seaweeds. In the Ceramium genus, Ceramium rubrum has been emphasized by several authors for its antimicrobial properties. Based on this background, the present study focused on the antimicrobial activity of a lipophilic extract of C. rubrum on Y. ruckeri and S. parasitica.ResultsThe alga, collected from the Pacific coast of Chile, underwent an ethanol extraction, and the concentrated extract was partitioned between water and dichloromethane. From the dichloromethane extract, fatty acids, fatty acid esters, one hydrocarbon and phytol were identified by Gas Chromatography–Mass Spectrometry (GC/MS) analysis. The antimicrobial study showed that the whole extract was more active than the individual components, which suggests a strong synergistic effect among the components.ConclusionsThese results may constitute a basis for promising future applied research that could investigate the use of C. rubrum seaweed as a source of antimicrobial compounds against fish pathogens.