The impact of the load on the shearer is mainly transmitted through cutting part.In this paper,in order to get the vertical steering vibration characteristics of the cutting part of the drum shearer,the working condit...The impact of the load on the shearer is mainly transmitted through cutting part.In this paper,in order to get the vertical steering vibration characteristics of the cutting part of the drum shearer,the working condition of coal mining machine is simplified.A simplified vertical steering model and the simplified vibration model of the whole cutting part of shearer are established.The vertical steering vibration process of the cutting unit is simplified into a single freedom and one forced vibration system under harmonic excitation.The dynamic response of the cutting part under sine excitation is obtained by using Matlab/Simulink for modeling and simulation.The influence of the support rigidity and damping of the high oil cylinder on the vertical steering vibration characteristics of the cutting part is analyzed.The results show that the damping of the cylinder can reduce the vibration of the system and the stability of the swing process of cutting the part is improved.展开更多
目的探讨维持性血液透析(maintenance hemodialysis,MHD)患者Nod样受体蛋白3/白细胞介素-1β(Nod-like receptor protein 3/interleukin 1β,NLRP3/IL-1β)信号通路活化与高密度脂蛋白胆固醇(high density lipoprotein cholesterol,HDL...目的探讨维持性血液透析(maintenance hemodialysis,MHD)患者Nod样受体蛋白3/白细胞介素-1β(Nod-like receptor protein 3/interleukin 1β,NLRP3/IL-1β)信号通路活化与高密度脂蛋白胆固醇(high density lipoprotein cholesterol,HDL-C)水平及动脉粥样硬化(atherosclerosis,AS)发生的关系。方法行MHD治疗的患者83例为研究组,20例健康人为对照组,检测生化指标、HDL-C、血白细胞介素(IL)-1β、IL-18及外周血单核细胞NLRP3mRNA;测定颈动脉内膜中层厚度(intimamedia thickness,IMT)。比较2组间上述指标的差异;分析HDL-C及颈动脉IMT与NLRP3mRNA、IL-1β及IL-18的相关性;明确影响MHD患者HDL-C水平及颈动脉IMT的危险因素。结果研究组MHD患者HDL-C低于对照组(t=-7.048,P<0.001),颈动脉IMT值大于对照组(t=2.634,P<0.001);血HDL-C与NLRP3mRNA(r=-0.682,P<0.001)、IL-1β(r=-0.537,P<0.001)及IL-18(r=-0.426,P<0.001)呈负相关;颈动脉IMT与NLRP3mRNA(r=0.521,P<0.001)、IL-1β(r=0.569,P<0.001)及IL-18(r=0.674,P<0.001)成正相关;NLRP3mRNA活化是HDL-C降低的危险因素(B=-0.390,p<0.001),而NLRP3mRNA、IL-18活化(B=0.069、0.002,均P<0.001)及HDL-C降低(B=-0.106,P<0.001)是MHD患者颈动脉IMT增厚的危险因素。结论NLRP3/IL-1β信号通路参与了MHD患者血HDL-C水平降低及颈动脉IMT增厚。展开更多
基金Project (BK20160250) supported by the Natural Science Foundation of Jiangsu Province,ChinaProject (17XLR028) supported by the Natural Science Foundation of Jiangsu Normal University,China
文摘The impact of the load on the shearer is mainly transmitted through cutting part.In this paper,in order to get the vertical steering vibration characteristics of the cutting part of the drum shearer,the working condition of coal mining machine is simplified.A simplified vertical steering model and the simplified vibration model of the whole cutting part of shearer are established.The vertical steering vibration process of the cutting unit is simplified into a single freedom and one forced vibration system under harmonic excitation.The dynamic response of the cutting part under sine excitation is obtained by using Matlab/Simulink for modeling and simulation.The influence of the support rigidity and damping of the high oil cylinder on the vertical steering vibration characteristics of the cutting part is analyzed.The results show that the damping of the cylinder can reduce the vibration of the system and the stability of the swing process of cutting the part is improved.
文摘目的探讨维持性血液透析(maintenance hemodialysis,MHD)患者Nod样受体蛋白3/白细胞介素-1β(Nod-like receptor protein 3/interleukin 1β,NLRP3/IL-1β)信号通路活化与高密度脂蛋白胆固醇(high density lipoprotein cholesterol,HDL-C)水平及动脉粥样硬化(atherosclerosis,AS)发生的关系。方法行MHD治疗的患者83例为研究组,20例健康人为对照组,检测生化指标、HDL-C、血白细胞介素(IL)-1β、IL-18及外周血单核细胞NLRP3mRNA;测定颈动脉内膜中层厚度(intimamedia thickness,IMT)。比较2组间上述指标的差异;分析HDL-C及颈动脉IMT与NLRP3mRNA、IL-1β及IL-18的相关性;明确影响MHD患者HDL-C水平及颈动脉IMT的危险因素。结果研究组MHD患者HDL-C低于对照组(t=-7.048,P<0.001),颈动脉IMT值大于对照组(t=2.634,P<0.001);血HDL-C与NLRP3mRNA(r=-0.682,P<0.001)、IL-1β(r=-0.537,P<0.001)及IL-18(r=-0.426,P<0.001)呈负相关;颈动脉IMT与NLRP3mRNA(r=0.521,P<0.001)、IL-1β(r=0.569,P<0.001)及IL-18(r=0.674,P<0.001)成正相关;NLRP3mRNA活化是HDL-C降低的危险因素(B=-0.390,p<0.001),而NLRP3mRNA、IL-18活化(B=0.069、0.002,均P<0.001)及HDL-C降低(B=-0.106,P<0.001)是MHD患者颈动脉IMT增厚的危险因素。结论NLRP3/IL-1β信号通路参与了MHD患者血HDL-C水平降低及颈动脉IMT增厚。
基金Jiangxi Provincial Natural Science Foundation of China(20161BAB206131)Science and Technology Research Project of Jiangxi Provincial Education Department of China(GJJ180896,GJJ150928)