设计了一种基于方形多毛细管X射线透镜的X射线探测系统,该系统具有较小的X射线收集角。方形多毛细管X射线透镜是一种基于X射线全反射的X射线调控器件,可将大面积范围内的X射线汇聚至X射线CCD探测器。通过测定X射线在方形多毛细管X射线...设计了一种基于方形多毛细管X射线透镜的X射线探测系统,该系统具有较小的X射线收集角。方形多毛细管X射线透镜是一种基于X射线全反射的X射线调控器件,可将大面积范围内的X射线汇聚至X射线CCD探测器。通过测定X射线在方形多毛细管X射线透镜中的传输特性、建立数据模型,可校正X射线CCD所测数据并还原透镜入口端的入射X射线信息。通过光线轨迹追踪方法模拟了方形多毛细管X射线透镜的传输特性。结果表明,该系统适合探测能量低于21.5 ke V的X射线,用于大面积成像;也适合探测能量低于14.6 ke V的X射线,用于提高探测效率。该系统不仅可用于诸如X射线脉冲星导航等特殊应用,也可用于常规X射线探测。展开更多
This paper presents the setup and performance of a drop tower experiment which investigates the behavior of liquid during self-driven capillary transport between two parallel perforated plates under microgravity. With...This paper presents the setup and performance of a drop tower experiment which investigates the behavior of liquid during self-driven capillary transport between two parallel perforated plates under microgravity. With the onset ofmicrogravity the liquid rises between the two parallel plates as a result of capillary pressure. Eight different sets of plates are tested in this study and the free surface height and the volume of transported liquid is subsequently analyzed. The plate sets differ in geometric properties of their perforations, distance, and width. In each set the perforations of both plates are identical and have a diameter of a few millimeters. The capillary rise velocity is influenced by the perforation diameter and the area porosity of the plates. As could be expected, the capillary transport capability increases with decreasing plate porosity.展开更多
The aim of the research is to determine the capillary conductivity coefficient as a characteristic material moisture parameter of the building materials using a non-destructive method while using microwave radiation. ...The aim of the research is to determine the capillary conductivity coefficient as a characteristic material moisture parameter of the building materials using a non-destructive method while using microwave radiation. Available documents are usually focused on the description of diffusion and similar works are based on the difference of partial pressure [I]. Publication will introduce experimental measurements the transport of humidity in porous material in a non-stationary state. As a result may be obtaining of data for formulation of humidity profiles with the help of experimentally built measuring apparatus without influence of human factor. Aim is verification of mentioned method of measurement for description of moisture parameters building materials applicable for practice. Complication in the determination of moisture parameters is various porous textures and the remains effect of condensation and transport influence of liquid moisture by diffusion in porous material. At the present time does not exist for standard use computational theory to description of transport of dampness in building materials. Moisture in porous medium is transported by the help of the capillary forces. The liquid moisture gradient is an indicator of moving of liquid moisture in a porous material through capillaries. This phenomenon is called capillary conductivity of moisture. Purpose presents measurement of material specimen for formulation of capillary conductivity coefficient and its dependence on moisture. The specimen of porous material is subjected to an isothermal moisture intake process. The transient moisture distribution in the specimen during the process is determined, at different stages of the process. Methodology of data scanning with the help of microwave radiation and data processing is processed for numerical computation on the basis known physics laws. The outputs of measurements can be used for evaluation of physical properties of building materials.展开更多
V3 loop of HIV-1 envelop protein gp120 plays a pivotal role in the entry process of HIV-1 into target cells. R15K, the relatively conserved region of V3 loop, can be used in binding studies instead of recombinant gp12...V3 loop of HIV-1 envelop protein gp120 plays a pivotal role in the entry process of HIV-1 into target cells. R15K, the relatively conserved region of V3 loop, can be used in binding studies instead of recombinant gp120 molecule. Polyanionic compounds, such as carrageenan, possess antiviral activity through disrupting gp120-CD4 interaction, and chemical modifications have been performed to improve such activity. In this work, we, for the first time, analyzed the interactions between carrageenan or its degradation and R15K by affinity capillary electrophoresis （ACE）. Our results revealed that depolymerized carrageenan rather than carrageenan could bind to R15K. The binding constant of depolymerized carrageenan was （2.94±0.57）× 10^6 mol/L. Our finding indicated that the depolymerized carrageenan could be R15K antagonist, and it might inhibit the infection of HIV-1 through the entry process.展开更多
Objective: To investigate and compare the effects of Electrothermal Bian-stone moxibustion and traditional box-moxibustion on capillary blood perfusion in the body surface. Methods: Twenty healthy subjects, 18 females...Objective: To investigate and compare the effects of Electrothermal Bian-stone moxibustion and traditional box-moxibustion on capillary blood perfusion in the body surface. Methods: Twenty healthy subjects, 18 females and 2 males, aged averagely 36 years, were enrolled in this experiment. The traditional box-moxibustion and electrothermal Bian-stone moxibustion were respectively given on the hypogastrium around Guanyuan (CV 4), and the changes of local capillary blood perfusion in the body surface were investigated with Laser Doppler Perfusion Imaging (LDPI). Results:The traditional box-moxibustion was superior to the electrothermal Bian-stone moxibustion in the transient increasing effect in whole body and the long-term increasing effect in the local area of moxibustion on capillary blood perfusion; but for both methods, the increasing effect on the capillary blood perfusion in the local area of moxibustion was same. Conclusion: Electrothermal Bian-stone moxibustion can not completely take the place of the traditional box-moxibustion; but for some disorders with local pain, they possibly have the same effects.展开更多
文摘设计了一种基于方形多毛细管X射线透镜的X射线探测系统,该系统具有较小的X射线收集角。方形多毛细管X射线透镜是一种基于X射线全反射的X射线调控器件,可将大面积范围内的X射线汇聚至X射线CCD探测器。通过测定X射线在方形多毛细管X射线透镜中的传输特性、建立数据模型,可校正X射线CCD所测数据并还原透镜入口端的入射X射线信息。通过光线轨迹追踪方法模拟了方形多毛细管X射线透镜的传输特性。结果表明,该系统适合探测能量低于21.5 ke V的X射线,用于大面积成像;也适合探测能量低于14.6 ke V的X射线,用于提高探测效率。该系统不仅可用于诸如X射线脉冲星导航等特殊应用,也可用于常规X射线探测。
文摘This paper presents the setup and performance of a drop tower experiment which investigates the behavior of liquid during self-driven capillary transport between two parallel perforated plates under microgravity. With the onset ofmicrogravity the liquid rises between the two parallel plates as a result of capillary pressure. Eight different sets of plates are tested in this study and the free surface height and the volume of transported liquid is subsequently analyzed. The plate sets differ in geometric properties of their perforations, distance, and width. In each set the perforations of both plates are identical and have a diameter of a few millimeters. The capillary rise velocity is influenced by the perforation diameter and the area porosity of the plates. As could be expected, the capillary transport capability increases with decreasing plate porosity.
文摘The aim of the research is to determine the capillary conductivity coefficient as a characteristic material moisture parameter of the building materials using a non-destructive method while using microwave radiation. Available documents are usually focused on the description of diffusion and similar works are based on the difference of partial pressure [I]. Publication will introduce experimental measurements the transport of humidity in porous material in a non-stationary state. As a result may be obtaining of data for formulation of humidity profiles with the help of experimentally built measuring apparatus without influence of human factor. Aim is verification of mentioned method of measurement for description of moisture parameters building materials applicable for practice. Complication in the determination of moisture parameters is various porous textures and the remains effect of condensation and transport influence of liquid moisture by diffusion in porous material. At the present time does not exist for standard use computational theory to description of transport of dampness in building materials. Moisture in porous medium is transported by the help of the capillary forces. The liquid moisture gradient is an indicator of moving of liquid moisture in a porous material through capillaries. This phenomenon is called capillary conductivity of moisture. Purpose presents measurement of material specimen for formulation of capillary conductivity coefficient and its dependence on moisture. The specimen of porous material is subjected to an isothermal moisture intake process. The transient moisture distribution in the specimen during the process is determined, at different stages of the process. Methodology of data scanning with the help of microwave radiation and data processing is processed for numerical computation on the basis known physics laws. The outputs of measurements can be used for evaluation of physical properties of building materials.
基金National Natural Science Foundation(Grant No.81373372)Specialized Research Fund for the Doctoral Program of Higher Education of China(Grant No.20110001110021 and 20130001110059)
文摘V3 loop of HIV-1 envelop protein gp120 plays a pivotal role in the entry process of HIV-1 into target cells. R15K, the relatively conserved region of V3 loop, can be used in binding studies instead of recombinant gp120 molecule. Polyanionic compounds, such as carrageenan, possess antiviral activity through disrupting gp120-CD4 interaction, and chemical modifications have been performed to improve such activity. In this work, we, for the first time, analyzed the interactions between carrageenan or its degradation and R15K by affinity capillary electrophoresis （ACE）. Our results revealed that depolymerized carrageenan rather than carrageenan could bind to R15K. The binding constant of depolymerized carrageenan was （2.94±0.57）× 10^6 mol/L. Our finding indicated that the depolymerized carrageenan could be R15K antagonist, and it might inhibit the infection of HIV-1 through the entry process.
基金supported by China Academy of Chinese Medical Sciences
文摘Objective: To investigate and compare the effects of Electrothermal Bian-stone moxibustion and traditional box-moxibustion on capillary blood perfusion in the body surface. Methods: Twenty healthy subjects, 18 females and 2 males, aged averagely 36 years, were enrolled in this experiment. The traditional box-moxibustion and electrothermal Bian-stone moxibustion were respectively given on the hypogastrium around Guanyuan (CV 4), and the changes of local capillary blood perfusion in the body surface were investigated with Laser Doppler Perfusion Imaging (LDPI). Results:The traditional box-moxibustion was superior to the electrothermal Bian-stone moxibustion in the transient increasing effect in whole body and the long-term increasing effect in the local area of moxibustion on capillary blood perfusion; but for both methods, the increasing effect on the capillary blood perfusion in the local area of moxibustion was same. Conclusion: Electrothermal Bian-stone moxibustion can not completely take the place of the traditional box-moxibustion; but for some disorders with local pain, they possibly have the same effects.
