奇异Hamilton-Jacobi-Bellman方程粘性解的存在唯一性

研究系数在边界点有奇性的一类Hamilt on- Jacobi- Bellman (HJB)方程的粘性解的存在唯一性问题及解的渐近估计,这类问题包括波动系数振荡或爆破的情况.奇异HJB方程在随机最优控制和金融数学等许多领域都有重要的应用,包括金融数学中的随机利率模型.应用粘性上下解理论建立了一类奇异HJB方程的比较原理,给出了粘性解存在唯一性的条件.     

Numerical simulation of electron cyclotron current drive characteristics on EAST

Electron cyclotron current drive （ECCD） will be applied in the EAST tokamak during its the new campaign. In order to provide theoretical predictions for relevant physical experiments, some numerical simulations of ECCD with the parameters of EAST have been can＇ied out by using TORAY-GA code based on the understanding of ECCD mechanisms. ECCD efficiencies achieved in different plasma and electron cyclotron （EC） wave parameters are given. The dependences of ECCD characteristics on EC wave injection angle, toroidal magnetic field, plasma density, and temperature are presented and discussed.     

直读光谱法分析丝状样品中的元素

应用直读原子光谱法分析直径在3 mm以下的丝状样品,设计了与之匹配的夹具,并对类型标准化样品、光源参数、样品处理条件进行了试验及优化.用该法对φ0.8的1Cr18Ni9Ti丝材样品进行测定,各元素光谱分析值与化学分析值接近,7次测定结果的相对标准偏差为0.30%～12.6%.     

Design of a TE10-TE30 Rectangular Mode Converter for 4.6GHz LHCD Launcher in the Experimental Advanced Superconducting Tokamak

A compact rectangular TE10-TE30 mode converter is developed for the lower hybrid current drive （LHCD） launcher on the Experimental Advanced Superconducting Tokamak （EAST） at 4.6 GHz. The converter with periodic width perturbation aims to divide the microwave power into three sub-waveguides in the poloidal direction. We present the design and numerical calculation of the mode converter. Calculations are performed on the ripple wall converter by codes based on numerical solving the coupled-mode differential equations and on the simulation of the High Frequency Structure Simulator （HFSS） package. The resulting conversion efficiency from TE10 mode to TE30 mode exceeds 95% within the bandwidth from 4.56 GHz to 4.64 GHz, and the return loss of the oversized transducer can be considerably decreased to 0.068% by means of a capacitive button embedded in the E-plane of the waveguide.     

Optimized calculation of the synergy conditions between electron cyclotron current drive and lower hybrid current drive on EAST

The optimized synergy conditions between electron cyclotron current drive(ECCD) and lower hybrid current drive(LHCD) with normal parameters of the EAST tokamak are studied by using the C3PO/LUKE code based on the understanding of the synergy mechanisms so as to obtain a higher synergistic current and provide theoretical reference for the synergistic effect in the EAST experiment. The dependences of the synergistic effect on the parameters of two waves(lower hybrid wave(LHW) and electron cyclotron wave(ECW)), including the radial position of the power deposition, the power value of the LH and EC waves, and the parallel refractive indices of the LHW(N) are presented and discussed.     

氢化物发生-原子荧光光谱法测定豌豆中的硒

以HNO3-HClO4消解样品,用HCl将六价硒还原为四价硒,建立了氢化物发生-原子荧光光谱法测定豌豆中硒的方法.在选定的最佳实验条件下,方法的检出限为0.1 ng/mL,线性范围为0-80 ng/mL.应用于三种豌豆中硒的测定,回收率为90.5%-110.6%,RSD为2.0%-5.7%.     

EAST电子回旋共振加热效果的数值模拟和分析

为了给EAST电子回旋共振加热物理实验提供理论依据和模拟预测,从电子热输运方程出发,运用CRONOS输运程序对不同等离子体和波参数下,电子回旋加热效果进行了数值模拟计算。给出不同电子回旋波功率、入射角、电子密度和纵场等参数对电子回旋加热效果的影响,预测在不同参数下,电子温度、等离子体总内能和能量约束时间的变化,分析了其原因,并与实验结果进行了初步的比较。     

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利用TORAY程序对电子回旋波的传播轨迹、功率沉积和电流驱动等参数与波束发射位置、发射角度的相互关系进行了数值模拟计算,给出了天线的最佳发射位置和天线平面反射镜在极向和环向转动角度的调节范围,分析了不同入射角对微波功率沉积及驱动电流的影响。     

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针对LHCD系统的微波器件测试,建立了一套高功率(100kW级、连续波)的微波测试系统。介绍了这一高功率微波系统的组成以及相关的测量手段。对俄罗斯生产的速调管进行了测试,给出了测试结果。