This paper proposes a type of double-layer charge liner fabricated using chemical vapor deposition(CVD)that has tungsten as its inner liner.The feasibility of this design was evaluated through penetration tests.Double...This paper proposes a type of double-layer charge liner fabricated using chemical vapor deposition(CVD)that has tungsten as its inner liner.The feasibility of this design was evaluated through penetration tests.Double-layer charge liners were fabricated by using CVD to deposit tungsten layers on the inner surfaces of pure T2 copper liners.The microstructures of the tungsten layers were analyzed using a scanning electron microscope(SEM).The feasibility analysis was carried out by pulsed X-rays,slug-retrieval test and static penetration tests.The shaped charge jet forming and penetration law of inner tungsten-coated double-layer liner were studied by numerical simulation method.The results showed that the double-layer liners could form well-shaped jets.The errors between the X-ray test results and the numerical results were within 11.07%.A slug-retrieval test was found that the retrieved slug was similar to a numerically simulated slug.Compared with the traditional pure copper shaped charge jet,the penetration depth of the double-layer shaped charge liner increased by 11.4% and>10.8% respectively.In summary,the test results are good,and the numerical simulation is in good agreement with the test,which verified the feasibility of using the CVD method to fabricate double-layer charge liners with a high-density and high-strength refractory metal as the inner liner.展开更多
为了探讨医疗学术会议的健康传播效能,本研究以2022中国肿瘤学大会(Chinese Congress on Oncology, CCO)为例,以哈罗德·拉斯韦尔5W传播模式为分析框架,对新浪微博平台相关话题下的所有微博进行内容分析和社会语义网络分析。结果显...为了探讨医疗学术会议的健康传播效能,本研究以2022中国肿瘤学大会(Chinese Congress on Oncology, CCO)为例,以哈罗德·拉斯韦尔5W传播模式为分析框架,对新浪微博平台相关话题下的所有微博进行内容分析和社会语义网络分析。结果显示,传播以会议资讯、学术交流和科普宣教3类信息为抓手,以医学专业人士和有健康需求的一般受众为传播目标,通过调动政务微博、主流媒体和医疗健康领域意见领袖的媒介组合,实现了3.5亿人次的微博传播阅读量。本研究认为,可以通过议程设置掌握舆论引导主动权,针对不同受众选择合适的传播组合方式,找准宣传契合点向新闻媒体最大化借力借势,充分重视社群作用激发大众传播潜能,为提升医疗学术会议健康传播效能提供理论指导和实践经验。展开更多
基金funded by the China Postdoctoral Science Foundation(Grant No.2022M721614)the opening project of State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology(Grant No.KFJJ23-07M)。
文摘This paper proposes a type of double-layer charge liner fabricated using chemical vapor deposition(CVD)that has tungsten as its inner liner.The feasibility of this design was evaluated through penetration tests.Double-layer charge liners were fabricated by using CVD to deposit tungsten layers on the inner surfaces of pure T2 copper liners.The microstructures of the tungsten layers were analyzed using a scanning electron microscope(SEM).The feasibility analysis was carried out by pulsed X-rays,slug-retrieval test and static penetration tests.The shaped charge jet forming and penetration law of inner tungsten-coated double-layer liner were studied by numerical simulation method.The results showed that the double-layer liners could form well-shaped jets.The errors between the X-ray test results and the numerical results were within 11.07%.A slug-retrieval test was found that the retrieved slug was similar to a numerically simulated slug.Compared with the traditional pure copper shaped charge jet,the penetration depth of the double-layer shaped charge liner increased by 11.4% and>10.8% respectively.In summary,the test results are good,and the numerical simulation is in good agreement with the test,which verified the feasibility of using the CVD method to fabricate double-layer charge liners with a high-density and high-strength refractory metal as the inner liner.
文摘为了探讨医疗学术会议的健康传播效能,本研究以2022中国肿瘤学大会(Chinese Congress on Oncology, CCO)为例,以哈罗德·拉斯韦尔5W传播模式为分析框架,对新浪微博平台相关话题下的所有微博进行内容分析和社会语义网络分析。结果显示,传播以会议资讯、学术交流和科普宣教3类信息为抓手,以医学专业人士和有健康需求的一般受众为传播目标,通过调动政务微博、主流媒体和医疗健康领域意见领袖的媒介组合,实现了3.5亿人次的微博传播阅读量。本研究认为,可以通过议程设置掌握舆论引导主动权,针对不同受众选择合适的传播组合方式,找准宣传契合点向新闻媒体最大化借力借势,充分重视社群作用激发大众传播潜能,为提升医疗学术会议健康传播效能提供理论指导和实践经验。
