Ultrasonic velocity measurement, a non-destructive and easy method to apply in both field and laboratory conditions, has increasingly been conducted to determine the physical properties of rock materials. This paper p...Ultrasonic velocity measurement, a non-destructive and easy method to apply in both field and laboratory conditions, has increasingly been conducted to determine the physical properties of rock materials. This paper presents an experimental study of the measurement of P-wave velocity, thermal conductivity and porosity of several types of sedimentary, metamorphic, and magmatic rocks. The aim of this study is to predict the rocks properties including their thermal conductivity and porosity using P-wave velocity. For this purpose, the physical properties are determined in the laboratory to obtain correlations between P-wave velocity and physical properties. Consequently, good linear relationships are found between all the determined physical properties and the P-wave velocity measurements.展开更多
Objective:To explore the association between lipoprotein and arteriosclerosis in hospitalized and outpatient populations in western Beijing.Methods:Patients enrolled in the outpatient department and hospitalization fr...Objective:To explore the association between lipoprotein and arteriosclerosis in hospitalized and outpatient populations in western Beijing.Methods:Patients enrolled in the outpatient department and hospitalization from January 2013 to December 2017 were selected and eventually 258 cases were included in the study according to strict enrollment and exclusion criteria. The data were true and reliable. Statistically, an independent sample t-test and correlation analysis method were used, and the receiver operating characteristic curve was plotted using the predicted values of apolipoprotein A1 and apolipoprotein B for arteriosclerosis by controlling confounding factors.Results: Correlation analysis showed that there was a significant correlation between apolipoprotein B (P=0.007, correlation coefficient: -0.203) and carotid-femoral pulse wave velocity. Apolipoprotein A1 and apolipoprotein B had a strong diagnostic value for arteriosclerosis in patients without coronary heart disease. Conclusions: There is a significant negative correlation between apolipoprotein B and carotid-pulse wave velocity in the unconflicted patients in this study. Apolipoprotein A1 and apolipoprotein B have diagnostic value for arteriosclerosis.展开更多
Results of P-wave velocity (vP) and electrical conductivity measurements on anorthosite are presented from room temperature to 880 C at 1.0 GPa using ultrasonic transmission technique and impedance spectra technique r...Results of P-wave velocity (vP) and electrical conductivity measurements on anorthosite are presented from room temperature to 880 C at 1.0 GPa using ultrasonic transmission technique and impedance spectra technique respec-tively. The experiments show that the P-wave velocities in anorthosite decrease markedly above 680 C following the dehydration of hydrous minerals in the rock, and the complex impedances collected from 12 Hz to 105 Hz only indicate the grain interior conduction mechanism at 1.0 GPa, from 410 C to 750 C. Because the fluids in the rock have not formed an interconnected network, the dehydration will not pronouncedly enhance the electrical conduc-tivity and change the electrical conduction mechanism. It is concluded that the formation and evolution of the low-velocity zones and high-conductivity layers in the crust may have no correlations, and the dehydration can result in the formation of the low-velocity zones, but cannot simultaneously result in the high-conductivity layers.展开更多
目的探讨陈氏挑针与牵旋法对腰椎间盘突出症(prolapse of lumbar intervertebral disc,LIDP)患者血液流变指标及疗效的影响。方法将218例LIDP患者按数字表法随机分为观察组各109例,最终观察组脱落4例,对照组脱落8例;分别为观察组105例,...目的探讨陈氏挑针与牵旋法对腰椎间盘突出症(prolapse of lumbar intervertebral disc,LIDP)患者血液流变指标及疗效的影响。方法将218例LIDP患者按数字表法随机分为观察组各109例,最终观察组脱落4例,对照组脱落8例;分别为观察组105例,对照组101例。其中观察组挑针与牵旋法治疗腰椎间盘突出相应节段椎旁神经根;对照组单纯牵旋治疗,每个疗程10次,两组均治疗2个疗程后,对比两组治疗前后血液黏稠度改变、胫腓神经F波传导速度和JOA评分,并观察针挑对患者神经根、症状缓解和疗效情况。结果与治疗前比较,观察组治疗后的胫腓神经F波传导速度、JOA评分均明显高于治疗前(P<0.01),且观察组高于对照组(P<0.01或P<0.05)。观察组治疗后全血表观黏度及血浆度值均明显下降(P<0.05);观察组总有效率明显优于对照组(P<0.05)。结论陈氏挑针与牵旋法可明显改善LIDP患者临床症状,调节血液流变学指数。同时,可提升由于LIDP神经根病损所致患肢胫、腓神经F波传导速度,缓解下肢症状群。展开更多
The P-wave velocities and electrical conductivities of gabbro were measured using ultrasonic transmission method and impedance spectroscopy from room temperature to 1100°C at 1–2 GPa, and the factors controlling...The P-wave velocities and electrical conductivities of gabbro were measured using ultrasonic transmission method and impedance spectroscopy from room temperature to 1100°C at 1–2 GPa, and the factors controlling the P-wave velocity and the microscopic conductance mechanisms of the rock were analyzed. The experimental results show that the P-wave velocities of gabbro drop abruptly at temperatures of 800-850°C and under pressures of 1–2 GPa due to the occurrence of grain boundary phases and dehydration melting; however, the electrical conductivities and electronic conduction mechanisms have not changed obviously at temperatures of 800–850°C. At temperatures Below 680°C, only one impedance arc (I) corresponding to grain interior conduction occurs at frequencies between 12 Hz and 105 Hz, the second arc (II) corresponding to grain boundary conduction occurs at temperatures above 680°C. The total conductivity of this rock is dominated by the grain interior conductivity as the occurrence of grain boundary conduction has a small effect on the total conductivity. The laboratory-measured velocities are consistent with the average P-wave velocity observations of lower crust and upper mantle. The conductivity values correspond well with the gabbroite composition of the lower crust and upper mantle; however, they are about 1-2 orders of magnitude lower than MT data from the high conductive layers. The experiments confirm that the dehydration of hydrous minerals can induce the partial melting, and the low seismic velocity zones might be correlated with the high conductive layers if partial melting occurs.展开更多
目的探讨原发性高血压(essential hypertension,EH)患者臂踝脉搏波传导速度(brachial and ankle pulse wave conduction velocity,baPWV)与血浆肾素浓度(plasmaren in concentration,PRC)、血浆醛固酮浓度(plasma aldosterone concentra...目的探讨原发性高血压(essential hypertension,EH)患者臂踝脉搏波传导速度(brachial and ankle pulse wave conduction velocity,baPWV)与血浆肾素浓度(plasmaren in concentration,PRC)、血浆醛固酮浓度(plasma aldosterone concentration,PAC)及醛固酮/肾素(aldosterone to renin ratio,ARR)的相关性。方法随机收集2021年3~4月参与云南省安宁市“中国居民心血管病及其危险因素监测”项目的研究对象208例,根据有无EH将研究对象分为非EH组和EH组,分别采集两组的基本资料、血生化、PRC、PAC、ARR及baPWV等指标。采用Spearman相关性分析评价EH患者baPWV与PRC、PAC、ARR的相关性。结果两组体重指数(bogymass index,BMI)、甘油三酯(triglyceride,TG)、高密度脂蛋白胆固醇(high density lipoprotein-cholesterol,HDL-C)、PRC、ARR、baPWV比较,差异均有统计学意义。Spearman相关性分析结果显示,baPWV与PRC(r=-0.148,P=0.131)、PAC(r=0.095,P=0.333)均无相关性,而baPWV与ARR(r=0.095,P=0.027)呈正相关。结论EH患者baPWV与PRC、PAC无显著相关性,与ARR呈正相关,ARR可作为动脉粥样硬化的预测指标和影响因素。展开更多
文摘Ultrasonic velocity measurement, a non-destructive and easy method to apply in both field and laboratory conditions, has increasingly been conducted to determine the physical properties of rock materials. This paper presents an experimental study of the measurement of P-wave velocity, thermal conductivity and porosity of several types of sedimentary, metamorphic, and magmatic rocks. The aim of this study is to predict the rocks properties including their thermal conductivity and porosity using P-wave velocity. For this purpose, the physical properties are determined in the laboratory to obtain correlations between P-wave velocity and physical properties. Consequently, good linear relationships are found between all the determined physical properties and the P-wave velocity measurements.
文摘Objective:To explore the association between lipoprotein and arteriosclerosis in hospitalized and outpatient populations in western Beijing.Methods:Patients enrolled in the outpatient department and hospitalization from January 2013 to December 2017 were selected and eventually 258 cases were included in the study according to strict enrollment and exclusion criteria. The data were true and reliable. Statistically, an independent sample t-test and correlation analysis method were used, and the receiver operating characteristic curve was plotted using the predicted values of apolipoprotein A1 and apolipoprotein B for arteriosclerosis by controlling confounding factors.Results: Correlation analysis showed that there was a significant correlation between apolipoprotein B (P=0.007, correlation coefficient: -0.203) and carotid-femoral pulse wave velocity. Apolipoprotein A1 and apolipoprotein B had a strong diagnostic value for arteriosclerosis in patients without coronary heart disease. Conclusions: There is a significant negative correlation between apolipoprotein B and carotid-pulse wave velocity in the unconflicted patients in this study. Apolipoprotein A1 and apolipoprotein B have diagnostic value for arteriosclerosis.
基金National Science Foundation of China (No. 10032040 and No. 49874013) and Joint Earthquake Science Foundation of China (No. 101119).
文摘Results of P-wave velocity (vP) and electrical conductivity measurements on anorthosite are presented from room temperature to 880 C at 1.0 GPa using ultrasonic transmission technique and impedance spectra technique respec-tively. The experiments show that the P-wave velocities in anorthosite decrease markedly above 680 C following the dehydration of hydrous minerals in the rock, and the complex impedances collected from 12 Hz to 105 Hz only indicate the grain interior conduction mechanism at 1.0 GPa, from 410 C to 750 C. Because the fluids in the rock have not formed an interconnected network, the dehydration will not pronouncedly enhance the electrical conduc-tivity and change the electrical conduction mechanism. It is concluded that the formation and evolution of the low-velocity zones and high-conductivity layers in the crust may have no correlations, and the dehydration can result in the formation of the low-velocity zones, but cannot simultaneously result in the high-conductivity layers.
文摘目的探讨陈氏挑针与牵旋法对腰椎间盘突出症(prolapse of lumbar intervertebral disc,LIDP)患者血液流变指标及疗效的影响。方法将218例LIDP患者按数字表法随机分为观察组各109例,最终观察组脱落4例,对照组脱落8例;分别为观察组105例,对照组101例。其中观察组挑针与牵旋法治疗腰椎间盘突出相应节段椎旁神经根;对照组单纯牵旋治疗,每个疗程10次,两组均治疗2个疗程后,对比两组治疗前后血液黏稠度改变、胫腓神经F波传导速度和JOA评分,并观察针挑对患者神经根、症状缓解和疗效情况。结果与治疗前比较,观察组治疗后的胫腓神经F波传导速度、JOA评分均明显高于治疗前(P<0.01),且观察组高于对照组(P<0.01或P<0.05)。观察组治疗后全血表观黏度及血浆度值均明显下降(P<0.05);观察组总有效率明显优于对照组(P<0.05)。结论陈氏挑针与牵旋法可明显改善LIDP患者临床症状,调节血液流变学指数。同时,可提升由于LIDP神经根病损所致患肢胫、腓神经F波传导速度,缓解下肢症状群。
基金the National Natural Science Foundation of China(Grant Nos.10032040 ,49874013)the Earthquake United Foundation of China(Grant No.101119).
文摘The P-wave velocities and electrical conductivities of gabbro were measured using ultrasonic transmission method and impedance spectroscopy from room temperature to 1100°C at 1–2 GPa, and the factors controlling the P-wave velocity and the microscopic conductance mechanisms of the rock were analyzed. The experimental results show that the P-wave velocities of gabbro drop abruptly at temperatures of 800-850°C and under pressures of 1–2 GPa due to the occurrence of grain boundary phases and dehydration melting; however, the electrical conductivities and electronic conduction mechanisms have not changed obviously at temperatures of 800–850°C. At temperatures Below 680°C, only one impedance arc (I) corresponding to grain interior conduction occurs at frequencies between 12 Hz and 105 Hz, the second arc (II) corresponding to grain boundary conduction occurs at temperatures above 680°C. The total conductivity of this rock is dominated by the grain interior conductivity as the occurrence of grain boundary conduction has a small effect on the total conductivity. The laboratory-measured velocities are consistent with the average P-wave velocity observations of lower crust and upper mantle. The conductivity values correspond well with the gabbroite composition of the lower crust and upper mantle; however, they are about 1-2 orders of magnitude lower than MT data from the high conductive layers. The experiments confirm that the dehydration of hydrous minerals can induce the partial melting, and the low seismic velocity zones might be correlated with the high conductive layers if partial melting occurs.
文摘目的探讨原发性高血压(essential hypertension,EH)患者臂踝脉搏波传导速度(brachial and ankle pulse wave conduction velocity,baPWV)与血浆肾素浓度(plasmaren in concentration,PRC)、血浆醛固酮浓度(plasma aldosterone concentration,PAC)及醛固酮/肾素(aldosterone to renin ratio,ARR)的相关性。方法随机收集2021年3~4月参与云南省安宁市“中国居民心血管病及其危险因素监测”项目的研究对象208例,根据有无EH将研究对象分为非EH组和EH组,分别采集两组的基本资料、血生化、PRC、PAC、ARR及baPWV等指标。采用Spearman相关性分析评价EH患者baPWV与PRC、PAC、ARR的相关性。结果两组体重指数(bogymass index,BMI)、甘油三酯(triglyceride,TG)、高密度脂蛋白胆固醇(high density lipoprotein-cholesterol,HDL-C)、PRC、ARR、baPWV比较,差异均有统计学意义。Spearman相关性分析结果显示,baPWV与PRC(r=-0.148,P=0.131)、PAC(r=0.095,P=0.333)均无相关性,而baPWV与ARR(r=0.095,P=0.027)呈正相关。结论EH患者baPWV与PRC、PAC无显著相关性,与ARR呈正相关,ARR可作为动脉粥样硬化的预测指标和影响因素。
