目的:探讨医用回旋加速器的粒子产生与运动机制,为实际工作提供技术支持。方法 :结合设备使用说明书Qilin service manual-maintenance part 10:ion source and central region和Qilin service manual-maintenance part13:extraction sy...目的:探讨医用回旋加速器的粒子产生与运动机制,为实际工作提供技术支持。方法 :结合设备使用说明书Qilin service manual-maintenance part 10:ion source and central region和Qilin service manual-maintenance part13:extraction system以及加速器领域相关参考文献,分析离子源、电磁场和束流引出系统的功能及其运行方法。结果:提出回旋加速器完成对粒子加速具备的必要条件:一是离子源内部形成等离子体,二是电磁场作用,三是经过束流引出系统引导束流轰击至指定靶位,四是需要一个真空系统以及一个供电和控制系统。结论:粒子的产生与运动以及保证束流的品质需要在各个子系统紧密配合下完成,准确理解医用回旋加速器的粒子产生与运动机制对于正确使用回旋加速器具有重要作用。展开更多
A model of magnetic stimulation is presented for analysis of the spatial distributions of the electric field induced by magnetic coils.Dimensionless analysis is introduced and makes the factors influencing the magnitu...A model of magnetic stimulation is presented for analysis of the spatial distributions of the electric field induced by magnetic coils.Dimensionless analysis is introduced and makes the factors influencing the magnitude of electric field into two parts:c (represents the stimulation conditions),and E 0 (reflects the geometry of coil).By 3 D simulation of the induced electric field of two kinds of coils,the effect of magnetic stimulation can be demonstrated and the factors influencing stimulating focality and depth are identified.The principles for determining the electric field magnitude,focality and magnetic stimulation depth when designing a reasonable coil and stimulator and achieving ideal stimulating effect are discussed.展开更多
Affinity membranes are fabricated for boric acid removal by the surface functionalization of microporous polypropylene membrane(MPPM)with lactose-based polyols.The affinity is based on specific complexation between bo...Affinity membranes are fabricated for boric acid removal by the surface functionalization of microporous polypropylene membrane(MPPM)with lactose-based polyols.The affinity is based on specific complexation between boric acid and saccharide polyols.A photoinduced grafting-chemical reaction sequence was used to prepare these affinity membranes.Poly(2-aminoethyl methacrylate hydrochloride)[poly(AEMA)]was grafted on the surfaces of MPPM by UV-induced graft polymerization.Grafting in the membrane pores was visualized by dying the cross-section of poly(AEMA)-grafted MPPM with fluorescein disodium and imaging with confocal laser scanning microscopy.It is concluded that lactose ligands can be covalently immobilized on the external surface and in the pores by the subsequent coupling of poly(AEMA)with lactobionic acid(LA).Physical and chemical properties of the affinity membranes were characterized by field emission scanning electron microscopy and Fourier Transform Infrared/Attenuated Total Refraction spectroscopy(FT-IR/ATR).3-Aminophenyl boric acid(3-APBA)was removed from aqueous solution by a single piece of lactose-functionalized MPPM in a dynamic filtration system.The results show that the 3-APBA removal reaches an optimal efficiency(39.5%)under the alkaline condition(pH9.1),which can be improved by increasing the immobilization density of LA.Regeneration of these affinity membranes can be easily realized through acid-base washing because the complexation of boric acid and saccharide polyol is reversible.展开更多
文摘目的:探讨医用回旋加速器的粒子产生与运动机制,为实际工作提供技术支持。方法 :结合设备使用说明书Qilin service manual-maintenance part 10:ion source and central region和Qilin service manual-maintenance part13:extraction system以及加速器领域相关参考文献,分析离子源、电磁场和束流引出系统的功能及其运行方法。结果:提出回旋加速器完成对粒子加速具备的必要条件:一是离子源内部形成等离子体,二是电磁场作用,三是经过束流引出系统引导束流轰击至指定靶位,四是需要一个真空系统以及一个供电和控制系统。结论:粒子的产生与运动以及保证束流的品质需要在各个子系统紧密配合下完成,准确理解医用回旋加速器的粒子产生与运动机制对于正确使用回旋加速器具有重要作用。
文摘A model of magnetic stimulation is presented for analysis of the spatial distributions of the electric field induced by magnetic coils.Dimensionless analysis is introduced and makes the factors influencing the magnitude of electric field into two parts:c (represents the stimulation conditions),and E 0 (reflects the geometry of coil).By 3 D simulation of the induced electric field of two kinds of coils,the effect of magnetic stimulation can be demonstrated and the factors influencing stimulating focality and depth are identified.The principles for determining the electric field magnitude,focality and magnetic stimulation depth when designing a reasonable coil and stimulator and achieving ideal stimulating effect are discussed.
基金Supported by the National Natural Science Foundation of China(50933006)the National Basic Research Program of China(2009CB623401)
文摘Affinity membranes are fabricated for boric acid removal by the surface functionalization of microporous polypropylene membrane(MPPM)with lactose-based polyols.The affinity is based on specific complexation between boric acid and saccharide polyols.A photoinduced grafting-chemical reaction sequence was used to prepare these affinity membranes.Poly(2-aminoethyl methacrylate hydrochloride)[poly(AEMA)]was grafted on the surfaces of MPPM by UV-induced graft polymerization.Grafting in the membrane pores was visualized by dying the cross-section of poly(AEMA)-grafted MPPM with fluorescein disodium and imaging with confocal laser scanning microscopy.It is concluded that lactose ligands can be covalently immobilized on the external surface and in the pores by the subsequent coupling of poly(AEMA)with lactobionic acid(LA).Physical and chemical properties of the affinity membranes were characterized by field emission scanning electron microscopy and Fourier Transform Infrared/Attenuated Total Refraction spectroscopy(FT-IR/ATR).3-Aminophenyl boric acid(3-APBA)was removed from aqueous solution by a single piece of lactose-functionalized MPPM in a dynamic filtration system.The results show that the 3-APBA removal reaches an optimal efficiency(39.5%)under the alkaline condition(pH9.1),which can be improved by increasing the immobilization density of LA.Regeneration of these affinity membranes can be easily realized through acid-base washing because the complexation of boric acid and saccharide polyol is reversible.
