In order to obtain the impact frequency of resonant coal breaking by self-excited oscillation pulsed supercritical carbon dioxide(SC-CO_(2))jet,large eddy simulation was used to analyze the formation and development p...In order to obtain the impact frequency of resonant coal breaking by self-excited oscillation pulsed supercritical carbon dioxide(SC-CO_(2))jet,large eddy simulation was used to analyze the formation and development process of self-excited oscillation pulsed SC-CO_(2)jet,the variation of jet impact frequency in the nozzle and the free flow field,and the variation of jet impact frequency at different positions in the jet axis and under different cavity lengths.The test device of jet impact frequency was developed,and experiments were performed to verify the conclusions of the numerical simulations.The results show that the frequency of the self-excited oscillation pulsed SC-CO_(2)jet is different in the nozzle and the free flow field.In the nozzle,the frequency generated by the fluid disturbance is the same,and the jet frequency at the exit of the nozzle is consistent with that inside the nozzle.In the free flow field,due to the compressibility of CO_(2),the pressure,velocity and other parameters of SC-CO_(2)jets have obvious fluctuation patterns.This feature causes the impact frequency of the self-excited oscillation pulsed SC-CO_(2)jet to decrease gradually in the axis.Changing the cavity length allows the adjustment of the jet impact frequency in the free flow field by affecting the disturbance frequency of the self-excited oscillation pulsed SC-CO_(2)jet inside the nozzle.展开更多
目的探讨非酒精性脂肪肝(NAFLD)患者体内循环脂肪素(adipsin)、内脂素(visfatin)和鸢尾素(irisin)水平及其相关性。方法选取我院2018年1月至2019年12月门诊及住院的NAFLD患者120例和性别、年龄等一般情况相匹配的正常人120例,采集两组...目的探讨非酒精性脂肪肝(NAFLD)患者体内循环脂肪素(adipsin)、内脂素(visfatin)和鸢尾素(irisin)水平及其相关性。方法选取我院2018年1月至2019年12月门诊及住院的NAFLD患者120例和性别、年龄等一般情况相匹配的正常人120例,采集两组受试者血样,记录并分析其一般生化指标、血清adipsin、visfatin和irisin的浓度水平。测量并计算体质量指数(body mass index,BMI)和胰岛素抵抗指数(insulin resistance of homeostasis model assessment,HOMA-IR)。分析血清adipsin、visfatin和irisin水平与NAFLD发病的相关性。结果NAFLD患者BMI、TG、TC、AST、ALT、FBG、HOMR-IR、adipsin水平较对照组高,HDL-C、visfatin和irisin水平较对照组低(P<0.05)。NAFLD患者adipsin水平与BMI、FBG、FINS、HOMA-IR、TG呈正相关(P<0.05);NAFLD患者visfatin及irisin水平均与BMI、FBG、FINS、HOMA-IR、TG呈负相关(P<0.05)。按四分位法、最高四分位数组与最低四分位数组比较,adipsin、visfatin、adipsin与NAFLD患病风险的OR值分别为4.15(95%CI:1.18~14.66)、0.15(95%CI:0.05~0.53)和0.20(95%CI:0.06~0.71)。结论循环中脂肪素水平的升高、内脂素和鸢尾素水平的降低与NAFLD患病风险相关。展开更多
基金Supported by National Natural Science Foundation of China(52174170,51974109)Basic Research Funds of Henan Polytechnic University(NSFRF220205)Strategic Consulting Research Project of Henan Research Institute of China Engineering Science and Technology Development Strategy(2022HENZDB03)。
文摘In order to obtain the impact frequency of resonant coal breaking by self-excited oscillation pulsed supercritical carbon dioxide(SC-CO_(2))jet,large eddy simulation was used to analyze the formation and development process of self-excited oscillation pulsed SC-CO_(2)jet,the variation of jet impact frequency in the nozzle and the free flow field,and the variation of jet impact frequency at different positions in the jet axis and under different cavity lengths.The test device of jet impact frequency was developed,and experiments were performed to verify the conclusions of the numerical simulations.The results show that the frequency of the self-excited oscillation pulsed SC-CO_(2)jet is different in the nozzle and the free flow field.In the nozzle,the frequency generated by the fluid disturbance is the same,and the jet frequency at the exit of the nozzle is consistent with that inside the nozzle.In the free flow field,due to the compressibility of CO_(2),the pressure,velocity and other parameters of SC-CO_(2)jets have obvious fluctuation patterns.This feature causes the impact frequency of the self-excited oscillation pulsed SC-CO_(2)jet to decrease gradually in the axis.Changing the cavity length allows the adjustment of the jet impact frequency in the free flow field by affecting the disturbance frequency of the self-excited oscillation pulsed SC-CO_(2)jet inside the nozzle.
文摘目的探讨非酒精性脂肪肝(NAFLD)患者体内循环脂肪素(adipsin)、内脂素(visfatin)和鸢尾素(irisin)水平及其相关性。方法选取我院2018年1月至2019年12月门诊及住院的NAFLD患者120例和性别、年龄等一般情况相匹配的正常人120例,采集两组受试者血样,记录并分析其一般生化指标、血清adipsin、visfatin和irisin的浓度水平。测量并计算体质量指数(body mass index,BMI)和胰岛素抵抗指数(insulin resistance of homeostasis model assessment,HOMA-IR)。分析血清adipsin、visfatin和irisin水平与NAFLD发病的相关性。结果NAFLD患者BMI、TG、TC、AST、ALT、FBG、HOMR-IR、adipsin水平较对照组高,HDL-C、visfatin和irisin水平较对照组低(P<0.05)。NAFLD患者adipsin水平与BMI、FBG、FINS、HOMA-IR、TG呈正相关(P<0.05);NAFLD患者visfatin及irisin水平均与BMI、FBG、FINS、HOMA-IR、TG呈负相关(P<0.05)。按四分位法、最高四分位数组与最低四分位数组比较,adipsin、visfatin、adipsin与NAFLD患病风险的OR值分别为4.15(95%CI:1.18~14.66)、0.15(95%CI:0.05~0.53)和0.20(95%CI:0.06~0.71)。结论循环中脂肪素水平的升高、内脂素和鸢尾素水平的降低与NAFLD患病风险相关。
