产气荚膜梭菌是革兰氏阳性杆菌,通过释放多种毒素和酶引发畜禽严重疾病,降低畜牧业生产。文献分析可把握学科发展方向,明确当前研究现状和发展趋势。然而,缺乏对产气荚膜梭菌文献的系统梳理,基于此,研究旨在利用Web of science核心数据...产气荚膜梭菌是革兰氏阳性杆菌,通过释放多种毒素和酶引发畜禽严重疾病,降低畜牧业生产。文献分析可把握学科发展方向,明确当前研究现状和发展趋势。然而,缺乏对产气荚膜梭菌文献的系统梳理,基于此,研究旨在利用Web of science核心数据库,以产气荚膜梭菌为关键词归纳,总结文献。结果表明:(1)1980-2022年,发表产气荚膜梭菌相关文献共计9093篇,其中“Foodborne Illness Acquired in the United States-Major Pathogens”,被引频次最多(1401次);(2)发文量较多的国家依次为美国(2688)>日本(850)>德国(644)>英国(561)>加拿大(501)>中国(500);(3)产气荚膜梭菌的关键词最大权重为toxin(1980-2022年),且以微生物,农业,食品科学技术,兽医学以及生物工程与应用生物学等学科交叉。产气荚膜梭菌的有效遏制是核心,快速根除是关键,该文分析产气荚膜梭菌的研究趋势,提出噬菌体治疗、疫苗免疫等今后研究新思路,为保障畜牧业生产提供理论支撑。展开更多
Inspired by nature's self-similar designs,novel honeycomb-spiderweb based self-similar hybrid cellular structures are proposed here for efficient energy absorption in impact applications.The energy absorption is e...Inspired by nature's self-similar designs,novel honeycomb-spiderweb based self-similar hybrid cellular structures are proposed here for efficient energy absorption in impact applications.The energy absorption is enhanced by optimizing the geometry and topology for a given mass.The proposed hybrid cellular structure is arrived after a thorough analysis of topologically enhanced self-similar structures.The optimized cell designs are rigorously tested considering dynamic loads involving crush and high-velocity bullet impact.Furthermore,the influence of thickness,radial connectivity,and order of patterning at the unit cell level are also investigated.The maximum crushing efficiency attained is found to be more than 95%,which is significantly higher than most existing traditional designs.Later on,the first and second-order hierarchical self-similar unit cell designs developed during crush analysis are used to prepare the cores for sandwich structures.Impact tests are performed on the developed sandwich structures using the standard 9-mm parabellum.The influence of multistaging on impact resistance is also investigated by maintaining a constant total thickness and mass of the sandwich structure.Moreover,in order to avoid layer-wise weak zones and hence,attain a uniform out-of-plane impact strength,off-setting the designs in each stage is proposed.The sandwich structures with first and second-order self-similar hybrid cores are observed to withstand impact velocities as high as 170 m/s and 270 m/s,respectively.展开更多
为全面了解土壤胶体影响重金属行为方向的研究现状和前沿动态,基于Web of Science(WoS)核心合集数据库,利用WoS自带分析工具、HistCite引文图谱分析软件、VOSviewer和Citespace可视化分析软件对1990—2021年间土壤胶体影响重金属行为的...为全面了解土壤胶体影响重金属行为方向的研究现状和前沿动态,基于Web of Science(WoS)核心合集数据库,利用WoS自带分析工具、HistCite引文图谱分析软件、VOSviewer和Citespace可视化分析软件对1990—2021年间土壤胶体影响重金属行为的文献进行了计量分析。结果表明,在世界范围内该方向的发文量逐年稳步增长,我国相关研究起步较晚,但近些年呈现迅猛发展的势头。目前土壤胶体影响重金属行为研究发文量最多的国家和研究机构分别是美国和中国科学院,发文量最高的期刊为Environmental Science&Technology,主要研究学科为环境科学与生态学的交叉学科。关键词聚类分析显示“土壤胶体颗粒粒径分级与重金属的形态分布”、“土壤胶体的释放、沉积及对重金属的吸附作用”和“土壤胶体颗粒的迁移机制与迁移模型研究”为主要的研究主题,人工纳米颗粒在土壤中的行为、迁移转化以及生物有效性是现阶段的研究热点。利用场流分离技术结合单粒子电感耦合等离子体质谱等技术,探讨土壤胶体与人工纳米颗粒之间发生的复杂相互作用及其对人工纳米颗粒迁移归趋与环境命运的影响,是未来的主要研究方向。展开更多
文摘产气荚膜梭菌是革兰氏阳性杆菌,通过释放多种毒素和酶引发畜禽严重疾病,降低畜牧业生产。文献分析可把握学科发展方向,明确当前研究现状和发展趋势。然而,缺乏对产气荚膜梭菌文献的系统梳理,基于此,研究旨在利用Web of science核心数据库,以产气荚膜梭菌为关键词归纳,总结文献。结果表明:(1)1980-2022年,发表产气荚膜梭菌相关文献共计9093篇,其中“Foodborne Illness Acquired in the United States-Major Pathogens”,被引频次最多(1401次);(2)发文量较多的国家依次为美国(2688)>日本(850)>德国(644)>英国(561)>加拿大(501)>中国(500);(3)产气荚膜梭菌的关键词最大权重为toxin(1980-2022年),且以微生物,农业,食品科学技术,兽医学以及生物工程与应用生物学等学科交叉。产气荚膜梭菌的有效遏制是核心,快速根除是关键,该文分析产气荚膜梭菌的研究趋势,提出噬菌体治疗、疫苗免疫等今后研究新思路,为保障畜牧业生产提供理论支撑。
基金the Science and Engineering Research Board(SERB),Department of Science and Technology,India,for funding this research through grant number SRG/2019/001581。
文摘Inspired by nature's self-similar designs,novel honeycomb-spiderweb based self-similar hybrid cellular structures are proposed here for efficient energy absorption in impact applications.The energy absorption is enhanced by optimizing the geometry and topology for a given mass.The proposed hybrid cellular structure is arrived after a thorough analysis of topologically enhanced self-similar structures.The optimized cell designs are rigorously tested considering dynamic loads involving crush and high-velocity bullet impact.Furthermore,the influence of thickness,radial connectivity,and order of patterning at the unit cell level are also investigated.The maximum crushing efficiency attained is found to be more than 95%,which is significantly higher than most existing traditional designs.Later on,the first and second-order hierarchical self-similar unit cell designs developed during crush analysis are used to prepare the cores for sandwich structures.Impact tests are performed on the developed sandwich structures using the standard 9-mm parabellum.The influence of multistaging on impact resistance is also investigated by maintaining a constant total thickness and mass of the sandwich structure.Moreover,in order to avoid layer-wise weak zones and hence,attain a uniform out-of-plane impact strength,off-setting the designs in each stage is proposed.The sandwich structures with first and second-order self-similar hybrid cores are observed to withstand impact velocities as high as 170 m/s and 270 m/s,respectively.
文摘为全面了解土壤胶体影响重金属行为方向的研究现状和前沿动态,基于Web of Science(WoS)核心合集数据库,利用WoS自带分析工具、HistCite引文图谱分析软件、VOSviewer和Citespace可视化分析软件对1990—2021年间土壤胶体影响重金属行为的文献进行了计量分析。结果表明,在世界范围内该方向的发文量逐年稳步增长,我国相关研究起步较晚,但近些年呈现迅猛发展的势头。目前土壤胶体影响重金属行为研究发文量最多的国家和研究机构分别是美国和中国科学院,发文量最高的期刊为Environmental Science&Technology,主要研究学科为环境科学与生态学的交叉学科。关键词聚类分析显示“土壤胶体颗粒粒径分级与重金属的形态分布”、“土壤胶体的释放、沉积及对重金属的吸附作用”和“土壤胶体颗粒的迁移机制与迁移模型研究”为主要的研究主题,人工纳米颗粒在土壤中的行为、迁移转化以及生物有效性是现阶段的研究热点。利用场流分离技术结合单粒子电感耦合等离子体质谱等技术,探讨土壤胶体与人工纳米颗粒之间发生的复杂相互作用及其对人工纳米颗粒迁移归趋与环境命运的影响,是未来的主要研究方向。
