目的研究食品包装领域的主要研究方向、发展态势以及前沿热点。方法利用核心期刊引文索引数据库Web of Science检索主题为“Food Packaging”的文献数据;筛选、剔重后导出文献至CiteSpace引文分析软件,从时间分布、作者分布、地域分布...目的研究食品包装领域的主要研究方向、发展态势以及前沿热点。方法利用核心期刊引文索引数据库Web of Science检索主题为“Food Packaging”的文献数据;筛选、剔重后导出文献至CiteSpace引文分析软件,从时间分布、作者分布、地域分布、期刊分布多个角度对食品包装领域概况进行研究;再利用引文分析、词频探测、突发词检测等方法研究食品包装的重大意义文献、不同时段的研究热点及领域前沿趋势,并通过突发词检测验证前沿热点分析结果的准确性。结果2019年食品包装领域的研究论文预计不低于2000篇;2009—2019年间食品包装领域重要影响文献的研究方向分别为纳米材料、壳聚糖薄膜、香精油、食品包装系统、乳酸、活性包装,中心度较高的重要影响文献有6篇;有食品包装的主要技术、包装材料的主要成分、被包装食品的种类共计22个主要的研究热点种类;近3年,食品包装领域的研究前沿呈现出由单一的包装性能研究(力学性能、抗菌性能)到丰富的包装需求研究(人体健康、灭菌性能),再到创新性的包装材料研究(壳聚糖、纳米材料、可降解材料)的变化趋势。结论基于CiteSpace的科学知识图谱挖掘覆盖了食品包装领域的研究概况、研究热点和前沿发展趋势。展开更多
In order to analyze the lubricating characteristics at different meshing points in the cycloid pin wheel transmission process,the cycloid gear teeth were discretized,combined with the kinematic analysis of the cycloid...In order to analyze the lubricating characteristics at different meshing points in the cycloid pin wheel transmission process,the cycloid gear teeth were discretized,combined with the kinematic analysis of the cycloid pin gear transmission and the contact analysis of the gear teeth.The progressive mesh densification method(PMD)was used to numerically solve the film thickness.The influence of the design parameters and process parameters on the lubrication characteristics was analyzed.The elastohydrodynamic lubrication and mixed lubrication characteristics at different contact points were obtained.The optimal meshing area of the cycloid gear tooth was determined,and the film thickness ratio,contact load ratio,maximum contact pressure at different points,average film thickness and roughness after contact deformation were analyzed.The conclusion of this study provides effective guidance for the research on the modification of cycloid gear teeth.展开更多
文摘目的研究食品包装领域的主要研究方向、发展态势以及前沿热点。方法利用核心期刊引文索引数据库Web of Science检索主题为“Food Packaging”的文献数据;筛选、剔重后导出文献至CiteSpace引文分析软件,从时间分布、作者分布、地域分布、期刊分布多个角度对食品包装领域概况进行研究;再利用引文分析、词频探测、突发词检测等方法研究食品包装的重大意义文献、不同时段的研究热点及领域前沿趋势,并通过突发词检测验证前沿热点分析结果的准确性。结果2019年食品包装领域的研究论文预计不低于2000篇;2009—2019年间食品包装领域重要影响文献的研究方向分别为纳米材料、壳聚糖薄膜、香精油、食品包装系统、乳酸、活性包装,中心度较高的重要影响文献有6篇;有食品包装的主要技术、包装材料的主要成分、被包装食品的种类共计22个主要的研究热点种类;近3年,食品包装领域的研究前沿呈现出由单一的包装性能研究(力学性能、抗菌性能)到丰富的包装需求研究(人体健康、灭菌性能),再到创新性的包装材料研究(壳聚糖、纳米材料、可降解材料)的变化趋势。结论基于CiteSpace的科学知识图谱挖掘覆盖了食品包装领域的研究概况、研究热点和前沿发展趋势。
基金Project(E2019209153)supported by the Natural Science Foundation of Hebei Province,China。
文摘In order to analyze the lubricating characteristics at different meshing points in the cycloid pin wheel transmission process,the cycloid gear teeth were discretized,combined with the kinematic analysis of the cycloid pin gear transmission and the contact analysis of the gear teeth.The progressive mesh densification method(PMD)was used to numerically solve the film thickness.The influence of the design parameters and process parameters on the lubrication characteristics was analyzed.The elastohydrodynamic lubrication and mixed lubrication characteristics at different contact points were obtained.The optimal meshing area of the cycloid gear tooth was determined,and the film thickness ratio,contact load ratio,maximum contact pressure at different points,average film thickness and roughness after contact deformation were analyzed.The conclusion of this study provides effective guidance for the research on the modification of cycloid gear teeth.
