OBJECTIVE: To explore the blood flow differences in cun-kou(radial) artery and anterior tibial artery between normal people and patients with chronic gastritis METHODS: Using doppler ultrasonography, blood flow charts...OBJECTIVE: To explore the blood flow differences in cun-kou(radial) artery and anterior tibial artery between normal people and patients with chronic gastritis METHODS: Using doppler ultrasonography, blood flow charts [peak systolic velocity(VP), maximum blood flow velocity in diastole(VD), mean blood flow velocity(VM), pulse index(PI), resistance index(RI), blood vessel diameter(D), vessel volume(SV),circulation blood flow periodic time(ET)] measured by at cun-kou(radial) artery and anterior tibial artery in normal group(n = 30) and chronic gastritis group(n = 30) in department of ultrasound, Beijing Anzhen hospital, capital medical university.RESULTS: In the doppler flow charts of the normal group, there were statistically significant differences in VD, VM, D, RI, SV, ET between cun-kou artery and anterior tibial artery(P < 0.05), and there were more statistically significant differences in PI between cun-kou artery and anterior tibial artery(P <0.01). In the comparison of doppler flow charts in the chronic gastritis group, there were statistically significant differences in VD, VM, D, RI, SV, ET between cun-kou artery and anterior tibial artery(P <0.05), and there were more statistically significant differences in PI between cun-kou artery and anterior tibial artery(P < 0.01). In the comparison of doppler flow charts between normal group and chronic gastritis group, there were statistically significant differences in SV, ET between normal group and chronic gastritis group(P < 0.05), and there were more statistically significant differences in PI between normal group and chronic gastritis group(P < 0.01).CONCLUSION: Based on the differences in doppler flow charts between the normal group and the chronic gastritis group, the doppler flow charts of cun-kou artery and anterior tibial artery were not only proved to be significantly different, but also provided quantitative objective indexes for the study of cun-kou artery and anterior tibial artery doppler flow charts of normal people and chronic gastritis patients. This study also proves that the doppler flow chart of the anterior tibial pulse is of great significance for the diagnosis of chronic gastritis.展开更多
In order to get the 3-D fine velocity structure in the Capital-circle area of China, 6 explosions, ranging from 1800 to 2500 kg, were conducted and recorded by an array of 240 seismographs. A reflection/refraction su...In order to get the 3-D fine velocity structure in the Capital-circle area of China, 6 explosions, ranging from 1800 to 2500 kg, were conducted and recorded by an array of 240 seismographs. A reflection/refraction survey was carried out along the profile extending from Anxin county, Hebei Province northeastward to Yanshan Mountains, crossing the Zhangjiakou-Bohai tectonic zone. The 2-D velocity structure of P wave was imaging along the profile. The results show that abnormality exists in the deep structure of the Zhangjiakou-Bohai tectonic zone: The base- ment is significantly depressed, the interfaces and Moho are uplifted, and a strong velocity gradient layer is existed above the Moho that may be dislocated by deep fault. The crust of Huabei basin is thin and low velocity body ex- ists in the crust. The Yanshan Mountains′ crust is thick, the layers in the crust are quite clear and the velocity in the layer is homogeneous. Huabei basin differs from Yanshan Mountains in structure.展开更多
The present work applied the HydroGeoSphere (HGS) model in humid tropical area to Koué watershed scale to simulate flows in porous and fractured area of crystalline aquifers. It integrates rainfall, physiographic...The present work applied the HydroGeoSphere (HGS) model in humid tropical area to Koué watershed scale to simulate flows in porous and fractured area of crystalline aquifers. It integrates rainfall, physiographic, fractures, hydraulic drilling and hydrodynamic data. The simulation of flows in porous area concerned 5 test zones. The input database of the model is implemented on a triangular grid in porous area using Gridbuilder software and interactive block grid in fractured area. In order to use the model in these two environments, boundary condition was set. The infiltrations rate of the earth layers is estimated in the order to 10-5 ms-1. The model simulates the pumping with a good reproductivity of the drawdown profiles of groundwater at the drillings. The storage coefficients vary between 9.9 × 10-4 and 2 × 10-3. The hydraulic conductivities vary from 8.5 × 10-6 to 2 × 10-5. 73.9% of the drillings studied has a high hydraulic conductivity and shows a strong drawdown of the groundwater table. The study of the static levels of the ground water allowed indicating the distribution of the water resources in the drillings: 57% are deep in the first 10 meters, 36% between 10 and 20 m, and 7% in the higher level to 20 m deep in the earth.展开更多
目的:探讨脑电地形图在脑瘤疗效判断上的应用价值。方法:通过对30例脑瘤治疗 前后脑电地形图改变进行对比研究。结果:脑电地形图在治疗前后有明显改变。结论:脑电地形图 可以作为脑瘤疗效评价的一个有价值的指标。<正>Objectif: D...目的:探讨脑电地形图在脑瘤疗效判断上的应用价值。方法:通过对30例脑瘤治疗 前后脑电地形图改变进行对比研究。结果:脑电地形图在治疗前后有明显改变。结论:脑电地形图 可以作为脑瘤疗效评价的一个有价值的指标。<正>Objectif: De explorer valeure appliq6e de encephale adas dan evaluation de effet cur atif de tumeur cerebral. Methode: Etude comparative de encephale adas de 30 malades avec tumeur cerebral avant et apr6s traitement est realise. Resultat: Encephale adas est change manifestement avant et apres traitement. Conclusion: Encephale adas est un index valable de jugement de effet curatif dans tumeur cerebral.展开更多
In this paper,we construct and analyze a Crank-Nicolson fitted finite volume scheme for pricing European options under regime-switching Kou’s jumpdiffusion model which is governed by a system of partial integro-diffe...In this paper,we construct and analyze a Crank-Nicolson fitted finite volume scheme for pricing European options under regime-switching Kou’s jumpdiffusion model which is governed by a system of partial integro-differential equations(PIDEs).We show that this scheme is consistent,stable and monotone as the mesh sizes in space and time approach zero,hence it ensures the convergence to the solution of continuous problem.Finally,numerical experiments are performed to demonstrate the efficiency,accuracy and robustness of the proposed method.展开更多
基金Supported by Special funds for basic scientific research of central universities(No.2017-JYB-JS-147)
文摘OBJECTIVE: To explore the blood flow differences in cun-kou(radial) artery and anterior tibial artery between normal people and patients with chronic gastritis METHODS: Using doppler ultrasonography, blood flow charts [peak systolic velocity(VP), maximum blood flow velocity in diastole(VD), mean blood flow velocity(VM), pulse index(PI), resistance index(RI), blood vessel diameter(D), vessel volume(SV),circulation blood flow periodic time(ET)] measured by at cun-kou(radial) artery and anterior tibial artery in normal group(n = 30) and chronic gastritis group(n = 30) in department of ultrasound, Beijing Anzhen hospital, capital medical university.RESULTS: In the doppler flow charts of the normal group, there were statistically significant differences in VD, VM, D, RI, SV, ET between cun-kou artery and anterior tibial artery(P < 0.05), and there were more statistically significant differences in PI between cun-kou artery and anterior tibial artery(P <0.01). In the comparison of doppler flow charts in the chronic gastritis group, there were statistically significant differences in VD, VM, D, RI, SV, ET between cun-kou artery and anterior tibial artery(P <0.05), and there were more statistically significant differences in PI between cun-kou artery and anterior tibial artery(P < 0.01). In the comparison of doppler flow charts between normal group and chronic gastritis group, there were statistically significant differences in SV, ET between normal group and chronic gastritis group(P < 0.05), and there were more statistically significant differences in PI between normal group and chronic gastritis group(P < 0.01).CONCLUSION: Based on the differences in doppler flow charts between the normal group and the chronic gastritis group, the doppler flow charts of cun-kou artery and anterior tibial artery were not only proved to be significantly different, but also provided quantitative objective indexes for the study of cun-kou artery and anterior tibial artery doppler flow charts of normal people and chronic gastritis patients. This study also proves that the doppler flow chart of the anterior tibial pulse is of great significance for the diagnosis of chronic gastritis.
基金Preliminary study of State Key Basic Research Project (2001CCA02100) and National Natural Science Foundation of China (40234038).
文摘In order to get the 3-D fine velocity structure in the Capital-circle area of China, 6 explosions, ranging from 1800 to 2500 kg, were conducted and recorded by an array of 240 seismographs. A reflection/refraction survey was carried out along the profile extending from Anxin county, Hebei Province northeastward to Yanshan Mountains, crossing the Zhangjiakou-Bohai tectonic zone. The 2-D velocity structure of P wave was imaging along the profile. The results show that abnormality exists in the deep structure of the Zhangjiakou-Bohai tectonic zone: The base- ment is significantly depressed, the interfaces and Moho are uplifted, and a strong velocity gradient layer is existed above the Moho that may be dislocated by deep fault. The crust of Huabei basin is thin and low velocity body ex- ists in the crust. The Yanshan Mountains′ crust is thick, the layers in the crust are quite clear and the velocity in the layer is homogeneous. Huabei basin differs from Yanshan Mountains in structure.
文摘The present work applied the HydroGeoSphere (HGS) model in humid tropical area to Koué watershed scale to simulate flows in porous and fractured area of crystalline aquifers. It integrates rainfall, physiographic, fractures, hydraulic drilling and hydrodynamic data. The simulation of flows in porous area concerned 5 test zones. The input database of the model is implemented on a triangular grid in porous area using Gridbuilder software and interactive block grid in fractured area. In order to use the model in these two environments, boundary condition was set. The infiltrations rate of the earth layers is estimated in the order to 10-5 ms-1. The model simulates the pumping with a good reproductivity of the drawdown profiles of groundwater at the drillings. The storage coefficients vary between 9.9 × 10-4 and 2 × 10-3. The hydraulic conductivities vary from 8.5 × 10-6 to 2 × 10-5. 73.9% of the drillings studied has a high hydraulic conductivity and shows a strong drawdown of the groundwater table. The study of the static levels of the ground water allowed indicating the distribution of the water resources in the drillings: 57% are deep in the first 10 meters, 36% between 10 and 20 m, and 7% in the higher level to 20 m deep in the earth.
文摘目的:探讨脑电地形图在脑瘤疗效判断上的应用价值。方法:通过对30例脑瘤治疗 前后脑电地形图改变进行对比研究。结果:脑电地形图在治疗前后有明显改变。结论:脑电地形图 可以作为脑瘤疗效评价的一个有价值的指标。<正>Objectif: De explorer valeure appliq6e de encephale adas dan evaluation de effet cur atif de tumeur cerebral. Methode: Etude comparative de encephale adas de 30 malades avec tumeur cerebral avant et apr6s traitement est realise. Resultat: Encephale adas est change manifestement avant et apres traitement. Conclusion: Encephale adas est un index valable de jugement de effet curatif dans tumeur cerebral.
基金supported by the National Natural Science Foundation of China(Nos.11971354,and 11701221)the Special Basic Cooperative Research Programs of Yunnan Provincial Undergraduate Universities’Association(No.2019FH001-079)the Fundamental Research Funds for the Central Universities(No.22120210555).
文摘In this paper,we construct and analyze a Crank-Nicolson fitted finite volume scheme for pricing European options under regime-switching Kou’s jumpdiffusion model which is governed by a system of partial integro-differential equations(PIDEs).We show that this scheme is consistent,stable and monotone as the mesh sizes in space and time approach zero,hence it ensures the convergence to the solution of continuous problem.Finally,numerical experiments are performed to demonstrate the efficiency,accuracy and robustness of the proposed method.
