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真空吸附铣削夹具的设计及其应用 被引量:17
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作者 沈则亮 《机床与液压》 北大核心 2011年第16期43-44,68,共3页
工件变形是影响薄板零件加工精度的主要问题。采用高速铣削加工可减小切削力、切削热、切削振动等产生的工件变形;利用真空吸附铣削夹具装夹工件,使其受到均匀分布的夹紧力,可大大减小因夹紧力造成的工件变形,提高零件的加工精度和表面... 工件变形是影响薄板零件加工精度的主要问题。采用高速铣削加工可减小切削力、切削热、切削振动等产生的工件变形;利用真空吸附铣削夹具装夹工件,使其受到均匀分布的夹紧力,可大大减小因夹紧力造成的工件变形,提高零件的加工精度和表面粗糙度。在介绍真空吸附夹具结构设计与工作原理的基础上,重点阐述薄板零件高速铣削加工真空吸附夹具的设计要点及其应用。 展开更多
关键词 工件变形 夹具结构 真空发生器系统
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骚扰功率两种测试方法的比较 被引量:8
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作者 邢琳 陈光 《低压电器》 北大核心 2007年第16期43-47,共5页
介绍了适用于小型受试设备的功率吸收钳测量法的原理及试验配置。以吸尘器为试品,根据CISPR16-2-2中规定的两种吸收钳测量法进行测试。并对测试数据进行分析、比较,验证了两种方法的可相互替代性。
关键词 吸收钳测量法 试验场地 受试设备 试验布置 骚扰功率
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Effects of Lizhong Tang on cultured mouse small intestine interstitial cells of Cajal 被引量:2
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作者 Min Woo Hwang Jung Nam Kim +3 位作者 Ho Jun Song Bora Lim Young Kyu Kwon Byung Joo Kim 《World Journal of Gastroenterology》 SCIE CAS 2013年第14期2249-2255,共7页
AIM:To investigate the effects of Lizhong Tang,an herbal product used in traditional Chinese medicine,on mouse small intestine interstitial cells of Cajal(ICCs).METHODS:Enzymatic digestions were used to dissociate ICC... AIM:To investigate the effects of Lizhong Tang,an herbal product used in traditional Chinese medicine,on mouse small intestine interstitial cells of Cajal(ICCs).METHODS:Enzymatic digestions were used to dissociate ICCs from mouse small intestine tissues.The ICCs were morphologically distinct from other cell types in culture and were identified using phase contrast microscopy after verification with anti c-kit antibody.A whole-cell patch-clamp configuration was used to record potentials(current clamp) from cultured ICCs.All of the experiments were performed at 30-32 ℃.RESULTS:ICCs generated pacemaker potentials,and Lizhong Tang produced membrane depolarization in current-clamp mode.The application of flufenamic acid(a nonselective cation channel blocker) abolished the generation of pacemaker potentials by Lizhong Tang.Pretreatment with thapsigargin(a Ca 2+-ATPase inhibi-tor in the endoplasmic reticulum) also abolished the generation of pacemaker potentials by Lizhong Tang.However,pacemaker potentials were completely abolished in the presence of an external Ca 2+-free solution,and under this condition,Lizhong Tang induced membrane depolarizations.Furthermore,When GDPβ-S(1 mmol/L) was in the pipette solution,Lizhong Tang still induced membrane depolarizations.In addition,membrane depolarizations were not inhibited by chelerythrine or calphostin C,which are protein kinase C inhibitors,but were inhibited by U-73122,an active phospholipase C inhibitors.CONCLUSION:These results suggest that Lizhong Tang might affect gastrointestinal motility by modulating pacemaker activity in interstitial cells of Cajal. 展开更多
关键词 INTERSTITIAL cells of CAJAL Lizhong TANG MOTILITY Gastrointestinal TRACT WHOLE-CELL patch clamp configuration
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适用于P型卡箍的线束捆直径计算方法
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作者 闫静 顾嘉炜 裴龙涛 《航空计算技术》 2022年第4期14-18,共5页
在电气线路互联系统(EWIS)的线束通道上,重要的线束捆常用P型金属带垫卡箍固定。线束捆直径是EWIS设计和装配的基础计算参数,不仅决定卡箍的规格,而且影响卡箍与线束捆的装配质量、线束通道横截面和穿过隔板或结构件的开孔大小。目前已... 在电气线路互联系统(EWIS)的线束通道上,重要的线束捆常用P型金属带垫卡箍固定。线束捆直径是EWIS设计和装配的基础计算参数,不仅决定卡箍的规格,而且影响卡箍与线束捆的装配质量、线束通道横截面和穿过隔板或结构件的开孔大小。目前已有直径计算主要是针对单分支最简单的线束捆,且不能给出线束截面几何排布。建立了线束捆直径计算的数学模型,模型求解基于二维不等圆Packing问题的启发式计算方法,不仅可以得到线束捆直径,而且可以计算出线束捆截面分支、分支内线芯的几何格局。在此基础上,提出了线束制造和总装装配工艺应遵循的三个原则,包括降维原则、分层原则和正圆原则。 展开更多
关键词 电气线路互联系统 P型金属带垫卡箍 线束捆 直径计算 线束捆格局
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