The problem of hydrodynamics of the three-leaf dislocated floating-ring bearing was studied by means of boundary element method.The law including the distribution of pressure on boundary surface(axial,bearing and floa...The problem of hydrodynamics of the three-leaf dislocated floating-ring bearing was studied by means of boundary element method.The law including the distribution of pressure on boundary surface(axial,bearing and floating-ring)and its friction loss in different eccentricities was obtained.The results show that the inner friction of three-leaf dislocated bearing increases from 390.875to 1 091.65,and the inner friction of three-leaf dislocated floating-ring bearing increases from 94.2523to 114.5069with eccentricity varying from 0to 0.075in nondimensional.So changing the pressure and flow field of bearing by adding floating-ring is more stability and less wasted work of friction than three-leaf dislocated bearing.展开更多
文摘目的探究凝血指标联合血清单核细胞趋化蛋白-1(monocyte chemotactic protein-1,MCP-1)对慢性肾脏病患者急性肾损伤的预测价值。方法选择2021年1月─2023年6月于联勤保障部队第九〇八医院收治的慢性肾脏病患者155例为研究对象,比较急性肾损伤组(40例)及急性肾损伤未发生组(115例)患者的临床基本资料、凝血指标、MCP-1水平。探究影响慢性肾脏病患者急性肾损伤发生的主要风险因素及凝血指标、MCP-1预测慢性肾脏病患者急性肾损伤的临床价值。结果急性肾损伤组患者的凝血酶时间(TT)、活化部分凝血酶时间(APTT)、凝血酶原时间(PT)、MCP-1水平较未发生组升高(t=20.506、20.551、21.120、16.230;均P<0.001);急性肾损伤组患者纤维蛋白原(FIB)水平较未发生组降低(t=8.441;P<0.001)。慢性肾脏病患者急性肾损伤与年龄、性别、体质量指数(body mass index,BMI)、糖尿病无关(t=0.521、0.760、0.648、2.399;P=0.477、0.383、0.341、0.121),与舒张压、收缩压、血尿酸、空腹血糖、总胆固醇(TC)、血肌酐(Scr)、三酰甘油(TAG)、高脂血症、高血压有关(t=15.681、12.942、11.694、6.914、12.836、8.392、9.724、14.856、11.372;均P<0.001)。以慢性肾脏病患者发生急性肾损伤为因变量,临床资料中P<0.05的变量为自变量行多因素Logistic回归分析,结果显示收缩压、舒张压、空腹血糖、血尿酸、TC、TAG、Scr、高血压、高脂血症、PT、TT、FIB、APTT、MCP-1为慢性肾脏病患者急性肾损伤发生的主要危险因素(OR值分别为:3490、3.357、3.050、2.980、3.264、2.861、3.287、2.939、3.466、9.196、3.350、3.281、2.974、3.404;95%CI分别为:2.210~4.770、1.947~4.767、1.862~4.238、1.838~4.122、2.104~4.424、1.751~3.971、2.065~4.510、1.813~4.065、2.416~4.516、1.982~4.410、2.082~4.618、2.103~4.459、1.780~4.168、2.092~4.716;P值分别为:0.002、0.004、0.005、0.002、<0.001、<0.001、<0.001、0.007、0.002、<0.001、<0.001、<0.001、<0.001、<0.001)。结论TT、APTT、PT、FIB、MCP-1水平与患者急性肾损伤发生有关,对慢性肾脏病患者急性肾损伤有较好的预测价值。
基金National Natural Science Foundation of China(11362015)
文摘The problem of hydrodynamics of the three-leaf dislocated floating-ring bearing was studied by means of boundary element method.The law including the distribution of pressure on boundary surface(axial,bearing and floating-ring)and its friction loss in different eccentricities was obtained.The results show that the inner friction of three-leaf dislocated bearing increases from 390.875to 1 091.65,and the inner friction of three-leaf dislocated floating-ring bearing increases from 94.2523to 114.5069with eccentricity varying from 0to 0.075in nondimensional.So changing the pressure and flow field of bearing by adding floating-ring is more stability and less wasted work of friction than three-leaf dislocated bearing.
