Seismic static stress triggering model is tested using Harvard centroid moment tensor (CMT) solution catalogue of 1976~2000 and concept of earthquake doublet. Result shows that seismic static stress triggering effect ...Seismic static stress triggering model is tested using Harvard centroid moment tensor (CMT) solution catalogue of 1976~2000 and concept of earthquake doublet. Result shows that seismic static stress triggering effect does exist in the view of global earthquakes, but the effect is very weak. Dividing the earthquakes into thrust focal mechanism, normal focal mechanism, strike-slip focal mechanism, we find that non-strike-slip focal mechanism earthquakes have significant triggering effect, whereas, the triggering effect in strike-slip focal mechanism earthquakes is not obvious. Divided the subsequent events delay time of earthquake doublet into 5 classes of t1, t<1, t10, t<10, 1t10 (t is in unit of d), then seismic static stress triggering effect does not change with delay time in short time period after earthquakes. The research on seismic static stress triggering in different regions of the world indicates that triggering effect is significant in subduction belts. Seismic static stress triggering model is tested by using earthquake doublets in China and its adjacent region. The result indicates that seismic static stress triggering effect cannot be observed easily in China and its adjacent region due to the seismic focal mechanism type (most of the earthquakes are strike-slip earthquakes).展开更多
A crowbar impulse current circuit for testing the switch-type surge protective device （SPD） is presented. The crowbar circuit consists of a computer control circuit, a trigger voltage pulse generator, a main dischar...A crowbar impulse current circuit for testing the switch-type surge protective device （SPD） is presented. The crowbar circuit consists of a computer control circuit, a trigger voltage pulse generator, a main discharging switch, and a crowbar pseudospark switch. The active trigger technology was studied in the crowbar impulse current circuit. The circuit monitors the main discharging current and generates a trigger signal at a proper time for the crowbar pseudospark switch operation. The trigger characteristics of the main discharge switch and the crowbar pseu- dospark switch were investigated. By monitoring the preset applied capacitor voltage, the gap distance of the main discharging switch could be adjusted to ensure a discharging delay time less than 2 μs. Equipped with a surface ttashover trigger device made of high relative perimittivity dielectric material BaTiO3 （εr = 3460）, the discharge delay time of the crowbar pseudospark switch is less than 85 ns, and the minimum operating voltage is less than 1% of its self-breakdown voltage. With a storage capacitor of 9 μF , an inductor of 18 μH and a crowbar pseudospark switch, a load of 30 mΩ and an applied capacitor voltage of 40 kV, an impulse current waveform of maximum 25 kA was generated with a rise time and time to half peak value of 17.2 μs and 336μs respectively.展开更多
目的分析血清可溶性髓样细胞触发受体2(sTREM2)、胰岛素样生长因子1(IGF-1)与2型糖尿病(T2DM)患者认知功能障碍的相关性及诊断价值。方法选取2022年1月至2024年10月武汉市红十字会医院126例T2DM患者纳入糖尿病组,另选取同期健康体检者6...目的分析血清可溶性髓样细胞触发受体2(sTREM2)、胰岛素样生长因子1(IGF-1)与2型糖尿病(T2DM)患者认知功能障碍的相关性及诊断价值。方法选取2022年1月至2024年10月武汉市红十字会医院126例T2DM患者纳入糖尿病组,另选取同期健康体检者60例纳入健康组。比较两组一般资料及血清sTREM2、IGF-1水平。根据蒙特利尔认知评估量表(MoCA)评分将126例T2DM患者分为正常组(65例)和障碍组(61例)。Logistic回归分析T2DM患者认知功能障碍的影响因素;Spearman分析血清sTREM2、IGF-1水平与MoCA评分的相关性;受试者工作特征(ROC)曲线分析sTREM2、IGF-1对T2DM患者认知功能障碍的诊断价值。结果糖尿病组血清sTREM2水平高于健康组(P<0.05),IGF-1水平低于健康组(P<0.05)。障碍组病程长于正常组(P<0.05),空腹血糖(FPG)、心率、糖化血红蛋白(HbA_(1)c)、低密度脂蛋白胆固醇(LDL-C)、空腹胰岛素(FINS)、C反应蛋白(CRP)、sTREM2高于正常组(P<0.05),高密度脂蛋白胆固醇(HDL-C)、IGF-1、MoCA评分低于正常组(P<0.05)。病程、HbA_(1)c、FINS、CRP、sTREM2升高是T2DM患者认知功能障碍的危险因素(P<0.05),IGF-1升高是保护因素(P<0.05)。血清sTREM2水平与MoCA评分呈负相关(r=-0.447,P<0.001),血清IGF-1水平与MoCA评分呈正相关(r=0.413,P<0.001)。血清sTREM2、IGF-1联合检测诊断T2DM患者认知功能障碍的曲线下面积(AUC)(0.938 vs 0.808,0.938 vs 0.794)高于单独检测(P<0.05)。结论T2DM患者血清sTREM2水平升高、IGF-1水平降低,与无认知功能障碍的患者相比,有认知功能障碍的患者血清sTREM2水平更高、IGF-1水平更低,血清sTREM2、IGF-1联合检测对T2DM认知功能障碍的诊断价值更高。展开更多
1引言可视化重用构件是可视化程序设计的基础,目前主流的可重用构件模型(CORBA,OLE/Ac-tsvex,Java玫ans[2〕等)都不太适合可视化重用构件模型〔,1,作者在完成IBM visualAge for smalltalk[3](以下简称VA Smalltalk)环境下的可重用中文...1引言可视化重用构件是可视化程序设计的基础,目前主流的可重用构件模型(CORBA,OLE/Ac-tsvex,Java玫ans[2〕等)都不太适合可视化重用构件模型〔,1,作者在完成IBM visualAge for smalltalk[3](以下简称VA Smalltalk)环境下的可重用中文报表构件时建造的可视化重用构件模型具有以下特点: ·展开更多
基金Joint Seismological Science Foundation of China (602005).
文摘Seismic static stress triggering model is tested using Harvard centroid moment tensor (CMT) solution catalogue of 1976~2000 and concept of earthquake doublet. Result shows that seismic static stress triggering effect does exist in the view of global earthquakes, but the effect is very weak. Dividing the earthquakes into thrust focal mechanism, normal focal mechanism, strike-slip focal mechanism, we find that non-strike-slip focal mechanism earthquakes have significant triggering effect, whereas, the triggering effect in strike-slip focal mechanism earthquakes is not obvious. Divided the subsequent events delay time of earthquake doublet into 5 classes of t1, t<1, t10, t<10, 1t10 (t is in unit of d), then seismic static stress triggering effect does not change with delay time in short time period after earthquakes. The research on seismic static stress triggering in different regions of the world indicates that triggering effect is significant in subduction belts. Seismic static stress triggering model is tested by using earthquake doublets in China and its adjacent region. The result indicates that seismic static stress triggering effect cannot be observed easily in China and its adjacent region due to the seismic focal mechanism type (most of the earthquakes are strike-slip earthquakes).
文摘A crowbar impulse current circuit for testing the switch-type surge protective device （SPD） is presented. The crowbar circuit consists of a computer control circuit, a trigger voltage pulse generator, a main discharging switch, and a crowbar pseudospark switch. The active trigger technology was studied in the crowbar impulse current circuit. The circuit monitors the main discharging current and generates a trigger signal at a proper time for the crowbar pseudospark switch operation. The trigger characteristics of the main discharge switch and the crowbar pseu- dospark switch were investigated. By monitoring the preset applied capacitor voltage, the gap distance of the main discharging switch could be adjusted to ensure a discharging delay time less than 2 μs. Equipped with a surface ttashover trigger device made of high relative perimittivity dielectric material BaTiO3 （εr = 3460）, the discharge delay time of the crowbar pseudospark switch is less than 85 ns, and the minimum operating voltage is less than 1% of its self-breakdown voltage. With a storage capacitor of 9 μF , an inductor of 18 μH and a crowbar pseudospark switch, a load of 30 mΩ and an applied capacitor voltage of 40 kV, an impulse current waveform of maximum 25 kA was generated with a rise time and time to half peak value of 17.2 μs and 336μs respectively.
文摘目的分析血清可溶性髓样细胞触发受体2(sTREM2)、胰岛素样生长因子1(IGF-1)与2型糖尿病(T2DM)患者认知功能障碍的相关性及诊断价值。方法选取2022年1月至2024年10月武汉市红十字会医院126例T2DM患者纳入糖尿病组,另选取同期健康体检者60例纳入健康组。比较两组一般资料及血清sTREM2、IGF-1水平。根据蒙特利尔认知评估量表(MoCA)评分将126例T2DM患者分为正常组(65例)和障碍组(61例)。Logistic回归分析T2DM患者认知功能障碍的影响因素;Spearman分析血清sTREM2、IGF-1水平与MoCA评分的相关性;受试者工作特征(ROC)曲线分析sTREM2、IGF-1对T2DM患者认知功能障碍的诊断价值。结果糖尿病组血清sTREM2水平高于健康组(P<0.05),IGF-1水平低于健康组(P<0.05)。障碍组病程长于正常组(P<0.05),空腹血糖(FPG)、心率、糖化血红蛋白(HbA_(1)c)、低密度脂蛋白胆固醇(LDL-C)、空腹胰岛素(FINS)、C反应蛋白(CRP)、sTREM2高于正常组(P<0.05),高密度脂蛋白胆固醇(HDL-C)、IGF-1、MoCA评分低于正常组(P<0.05)。病程、HbA_(1)c、FINS、CRP、sTREM2升高是T2DM患者认知功能障碍的危险因素(P<0.05),IGF-1升高是保护因素(P<0.05)。血清sTREM2水平与MoCA评分呈负相关(r=-0.447,P<0.001),血清IGF-1水平与MoCA评分呈正相关(r=0.413,P<0.001)。血清sTREM2、IGF-1联合检测诊断T2DM患者认知功能障碍的曲线下面积(AUC)(0.938 vs 0.808,0.938 vs 0.794)高于单独检测(P<0.05)。结论T2DM患者血清sTREM2水平升高、IGF-1水平降低,与无认知功能障碍的患者相比,有认知功能障碍的患者血清sTREM2水平更高、IGF-1水平更低,血清sTREM2、IGF-1联合检测对T2DM认知功能障碍的诊断价值更高。
