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1.
This work is an experimental and theoretical study of antimony speciation and the solubility of Sb2O5, Sb2O3 and Sb2(SO4)3 at 298 K in aqueous sulphuric acid solutions (0 to 6 kmol/m3). A thermodynamic model was developed to quantify the solubility products and aqueous metal speciation. Main dissolved species were H3SbO3(aq) and H3SbO4(aq). The solubility of antimony increases with increasing solution acidity and with the presence of hydrogen peroxide in the solution. The following standard equilibrium constants at 298 K were obtained: Log K0(Sb2O5) = 11.7±0.5, Log K0(Sb2O3) = 32±1, and Log K0(Sb2(SO4)3) = 55±2. 相似文献
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Single-fluorophore imaging with an unmodified epifluorescence microscope and conventional video camera 总被引:1,自引:0,他引:1
Single fluorophores in aqueous solution were imaged in real time with a conventional silicon-intensified target video camera connected to an unmodified commercial microscope (IX70, Olympus) with epifluorescence excitation with a high-pressure mercury lamp. Neither a powerful laser nor an extremely sensitive video camera was required. Three experimental systems were used to demonstrate quantitatively that individual, moving or stationary Cy3 fluorophores could be imaged with the microscope: Cy3-gelsolin attached to an actin filament sliding over heavy meromyosin, sliding actin filaments sparsely labelled with Cy3, and heavy meromyosin labelled with one or two Cy3 fluorophores. The results should encourage many laboratories to attempt 'single-molecule physiology' in which the functions and mechanisms of molecular machines are studied at the single-molecule level in an environment where the biological machines are fully active. 相似文献
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In this paper, coupled higher order nonlinear Schrödinger–Maxwell–Bloch equations are studied for the ultrashort pulse propagation in erbium-doped birefringent fiber system. Lax pair is constructed for the CHNLS–MB system. Through the Darboux method and symbolic computation, analytic two-soliton solution is obtained. To analyze the specific problem, we design an optimal system by properly choosing the special form of variable coefficients. Here, using obtained two-soliton solution, tunneling of femtosecond soliton through barrier and well is investigated. While solitons are passing through barrier and well, some unexpected behavior is observed and hidden possibilities in switching action through tunneling is investigated. 相似文献
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对埋栅型SIT,为切断栅极和源极(或阴极)之间在外延过程中形成的连体,打开栅电极区,进行外延后的台面刻蚀,对台面刻蚀的深度和形状进行研究;为消除栅墙外划片边界造成的各种寄生效应,在有源区的外面挖深槽,以保证栅源击穿发生在内部、实现击穿接近理论值。对先刻蚀台面还是先刻蚀槽的问题做了实验对比,结果发现先台后槽更有利于器件特性的改善。 相似文献
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UHF频段高功率SiC SIT 总被引:1,自引:1,他引:0
采用导通SiC衬底上的SiC多层外延材料,成功制作出了国内首个SiC SIT(静电感应晶体管).该器件研制中,采用了自对准工艺、高能离子注入及高温退火工艺、密集栅深凹槽干法刻蚀工艺、PECVD SiO:和SizNy介质钝化工艺,有效抑制了漏电并提高了器件击穿电压,器件功率输出能力由此得到提升.最终28 cm栅宽SiC ... 相似文献
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LabVIEW SIT(simulation interface toolkit)是由NI公司开发的一套仿真接口工具包,它能够实现LabVIEW和Simulink仿真模型的无缝链接。在提出了一种基于LabVIEW SIT的典型快速控制原型开发架构后,分析了LabVIEW SIT环境下PCI板卡驱动程序的实现方法。以PCI-9111HR多功能数据采集卡为例,介绍了驱动程序开发的方法及编程要点,给出了LabVIEW SIT下驱动程序的基本框架,并提供了部分关键代码。在某导弹舵机半实物仿真系统中的运行结果表明该驱动程序运行稳定、可靠。 相似文献
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介绍了非能动安注箱的设计与实验,并用CATHENA程序分析其特性:注入流量的峰值,高注入流量的持续时间,最低注入流量等。计算结果表明非能动安注箱设计满足主要的性能要求,CATHENA程序计算结果与实验数据基本一致,可用于概念设计与事故分析。 相似文献