This present issue is an extension of the work of Y. Xiao-Zhong et al. who investigated the influence of constant external magnetic field on the decoherence of a central electron spin of atom coupled to an anti-ferrom...This present issue is an extension of the work of Y. Xiao-Zhong et al. who investigated the influence of constant external magnetic field on the decoherence of a central electron spin of atom coupled to an anti-ferromagnetic environment. We have shown in this work that the character variability of the field induces oscillations amongst the eigen modes of the environment. This observation is made via the derivation of the transition probability density of state, a manner by which critical parameters (parameters where transition occur) of the system could be obtained as it shows resonance peak. We equally observed that the two different magnons modes resulting from the frequency splitting via the application of the time-varying external B-Field, exhibit each a resonant peak of similar amplitude at different temperature ranges. This additional information shows that the probability for the central spin system to remain in its initially prepared diabatic state is enhanced for some temperature ranges for the corresponding two magnon modes. Hence, these temperature ranges where the probability density is maximum could save as decoherence free environment;an important requirement for the implementation of quantum computation and information processing in solid state circuitry. The theoretical and numerical results presented for the decoherence time and the probability density are that of a decohered central electron spin coupled to an anti-ferromagnetic spin bath. The theory is based on a spin wave approximation and on the density matrix using both transformations of Bloch, Primakov and Bogoliobuv in the adiabatic limit.展开更多
The paper describes experiments on formation of a plasma channel with imbedded B-field for transporting high power ion beam. The plasma was generated with a 5-turn loop inductive antenna driven by an H-bridge type RF ...The paper describes experiments on formation of a plasma channel with imbedded B-field for transporting high power ion beam. The plasma was generated with a 5-turn loop inductive antenna driven by an H-bridge type RF generator. The azimuthal B-field in the channel of 0.5-1.5 kG was formed by a pulsed current from external capacitor bank. Control of the hydrogen gas pressure was provided by an electromagnetic puffvalve. The paper describes experimental devices and results on the generated plasma parameters as function of RF frequency, antenna voltage, pulse duration and puffgas pressure. When operating at-1 kG B-field, ambient gas pressure in the range of few -10 mTorr, and 5 kV antenna voltage at resonant frequency of 150 kHz, the plasma density range was （3-7）×10^12 cm3 with a temperature of a few eV.展开更多
海洋标量场可视化对于科研人员分析海洋极端天气、划定船只航线以及预测鱼群数量具有重要作用。本文以海洋环境再分析产品为基础,构建了网格海洋环境数据的文本格式转化方法,并借助ArcGISAPIforJa⁃vaScript完成可视化,实现了海洋标量场...海洋标量场可视化对于科研人员分析海洋极端天气、划定船只航线以及预测鱼群数量具有重要作用。本文以海洋环境再分析产品为基础,构建了网格海洋环境数据的文本格式转化方法,并借助ArcGISAPIforJa⁃vaScript完成可视化,实现了海洋标量场的轻量级架构展示,解决了以往服务器资源占用多、系统响应速度慢等问题。本文提出的可视化架构支撑了海水温度、盐度、海面高等各类海洋环境标量数据在西太海洋数据和信息网络(Ocean Data and Information Network for the WESTPAC,ODINWESTPAC)系统中的有效展示,可为海洋管理者及科研人员提供信息服务。展开更多
Influences of enhanced ultraviolet radiation (UV B,280-315nm) on accumulation and cycling of Mg and Zn of wheat field ecosystem were investigated under field conditions.UV B radiation increased concentrations of Mg an...Influences of enhanced ultraviolet radiation (UV B,280-315nm) on accumulation and cycling of Mg and Zn of wheat field ecosystem were investigated under field conditions.UV B radiation increased concentrations of Mg and Zn in leaves and stems,and affected concentrations of Mg and Zn in roots and spikes at various developmental stages significantly.The responses of accumulation of Mg and Zn in leaves to UV B radiation were different among developmental stages.Accumulation of Zn in stems were higher than control under 2.54 and 4.25 kJ.m -2 UV B radiation,and lower than control under 5.31 kJ.m -2 UV B radiation.At various developmental stages,UV B radiation significantly reduced accumulation of Mg in stems,roots and spikes,and accumulation of Zn in roots and spikes.UV B radiation significantly decreased accumulation of Mg and Zn in whole plants at various developmental stages.The contribution of biomass to the accumulation of Mg and Zn might be more than that of the concentrations of Mg and Zn.UV B radiation reduced output of Mg and Zn of spring wheat colonies.This might indicate decreases in output input ratio and cycling function of Mg and Zn in wheat field ecosystem.Increases in concentrations of exchangeable Mg and available Zn in soil were the results of decreases in output of Mg and Zn of spring wheat colonies. It might lead to the occurrence of higher storage of Mg and Zn in soil.展开更多
文摘This present issue is an extension of the work of Y. Xiao-Zhong et al. who investigated the influence of constant external magnetic field on the decoherence of a central electron spin of atom coupled to an anti-ferromagnetic environment. We have shown in this work that the character variability of the field induces oscillations amongst the eigen modes of the environment. This observation is made via the derivation of the transition probability density of state, a manner by which critical parameters (parameters where transition occur) of the system could be obtained as it shows resonance peak. We equally observed that the two different magnons modes resulting from the frequency splitting via the application of the time-varying external B-Field, exhibit each a resonant peak of similar amplitude at different temperature ranges. This additional information shows that the probability for the central spin system to remain in its initially prepared diabatic state is enhanced for some temperature ranges for the corresponding two magnon modes. Hence, these temperature ranges where the probability density is maximum could save as decoherence free environment;an important requirement for the implementation of quantum computation and information processing in solid state circuitry. The theoretical and numerical results presented for the decoherence time and the probability density are that of a decohered central electron spin coupled to an anti-ferromagnetic spin bath. The theory is based on a spin wave approximation and on the density matrix using both transformations of Bloch, Primakov and Bogoliobuv in the adiabatic limit.
文摘The paper describes experiments on formation of a plasma channel with imbedded B-field for transporting high power ion beam. The plasma was generated with a 5-turn loop inductive antenna driven by an H-bridge type RF generator. The azimuthal B-field in the channel of 0.5-1.5 kG was formed by a pulsed current from external capacitor bank. Control of the hydrogen gas pressure was provided by an electromagnetic puffvalve. The paper describes experimental devices and results on the generated plasma parameters as function of RF frequency, antenna voltage, pulse duration and puffgas pressure. When operating at-1 kG B-field, ambient gas pressure in the range of few -10 mTorr, and 5 kV antenna voltage at resonant frequency of 150 kHz, the plasma density range was （3-7）×10^12 cm3 with a temperature of a few eV.
文摘海洋标量场可视化对于科研人员分析海洋极端天气、划定船只航线以及预测鱼群数量具有重要作用。本文以海洋环境再分析产品为基础,构建了网格海洋环境数据的文本格式转化方法,并借助ArcGISAPIforJa⁃vaScript完成可视化,实现了海洋标量场的轻量级架构展示,解决了以往服务器资源占用多、系统响应速度慢等问题。本文提出的可视化架构支撑了海水温度、盐度、海面高等各类海洋环境标量数据在西太海洋数据和信息网络(Ocean Data and Information Network for the WESTPAC,ODINWESTPAC)系统中的有效展示,可为海洋管理者及科研人员提供信息服务。
文摘Influences of enhanced ultraviolet radiation (UV B,280-315nm) on accumulation and cycling of Mg and Zn of wheat field ecosystem were investigated under field conditions.UV B radiation increased concentrations of Mg and Zn in leaves and stems,and affected concentrations of Mg and Zn in roots and spikes at various developmental stages significantly.The responses of accumulation of Mg and Zn in leaves to UV B radiation were different among developmental stages.Accumulation of Zn in stems were higher than control under 2.54 and 4.25 kJ.m -2 UV B radiation,and lower than control under 5.31 kJ.m -2 UV B radiation.At various developmental stages,UV B radiation significantly reduced accumulation of Mg in stems,roots and spikes,and accumulation of Zn in roots and spikes.UV B radiation significantly decreased accumulation of Mg and Zn in whole plants at various developmental stages.The contribution of biomass to the accumulation of Mg and Zn might be more than that of the concentrations of Mg and Zn.UV B radiation reduced output of Mg and Zn of spring wheat colonies.This might indicate decreases in output input ratio and cycling function of Mg and Zn in wheat field ecosystem.Increases in concentrations of exchangeable Mg and available Zn in soil were the results of decreases in output of Mg and Zn of spring wheat colonies. It might lead to the occurrence of higher storage of Mg and Zn in soil.
