Influence of structural parameters on the immunity of short-channel effects in grooved-gate nMOSFET

This paper presents the influences of structural parameters on the immunity of short-channel effects in grooved-gate n-channel metal－oxide－semiconductor field effect transistor (nMOSFET) using the simulator PISCES-II. The zero or negative groove-junction depth is beneficial to the improvement of the threshold characters, but there exists a limited range. The doping concentration of both substrate and channel has a significant influence on the threshold characters as well as on the device transconductance. Thus, the variation in these adjustable parameters may help to optimize the device design.     

自旋光电流与电流诱导的电子自旋极化——半导体自旋电子学的新进展

文章通过自旋光电流与Kerr效应的实验，介绍在自旋一轨道耦合的体系中，如何通过自旋注入来驱动电子的运动产生电流，又如何反过来通过电子的运动或电流在系统中产生自旋激化．实验结果表明，自旋轨道耦合不但给我们提供了对自旋的操控手段，而且还给我们提供了用非磁性材料且无外加磁场条件下作为自旋源的新途径．     

蔗糖水解反应速率常数的毛细管电泳测定方法研究

利用具有高分辨率和高灵敏度的毛细管电泳-电化学检测方法直接测定蔗糖及其水解产物的浓度随反应时间变化的规律．在HCI催化下，对不同温度时蔗糖的水解反应速率常数进行了测定，并求得反应活化能Ea为109．8kJ／mol．该方法比经典的旋光度测定方法更直观简便，结果令人满意．     

Effect of Enteral Nutrition Formula on Fat Absorption and Serum Free Fatty Acid Profiles in Rat with Short-Bowel Syndrome

The effects of enteral nutrition containing long chain triglycerides(LCT)and medium chain triglycerides(MCT)or L-arginine(Arg)on fat absorbability,serum free fatty acid profiles and intestinal morphology in rats withshort-bowel syndrome(SBS)were studied using gas chromatography.Twenty-eight Sprague-Dawley rats wererandomly assigned to 4 groups:sham operation fed with LCT as control;85% small bowel resection fed with LCT,MCT/LCT,and Arg/LCT,respectively.SBS rats showed a decrease of fat absorptivity.Enteral nutrition supple-mented with MCT could increase fat absorptivity.L-Arginine enhanced enteral nutrition was associated with theelevation of fat absorptivity,possibly due to its enterotrophic effect on remnant small bowel mucosa.LCT groupshowed a significant deficiency of total free fatty acid and the decreased essential fatty acid content,which was im-proved in other two SBS groups.     

Impurity effect on weak antilocalization in the topological insulator Bi2Te3

We study the weak antilocalization (WAL) effect in topological insulator Bi(2)Te(3) thin films at low temperatures. The two-dimensional WAL effect associated with surface carriers is revealed in the tilted magnetic field dependence of magnetoconductance. Our data demonstrate that the observed WAL is robust against deposition of nonmagnetic Au impurities on the surface of the thin films, but it is quenched by the deposition of magnetic Fe impurities which destroy the π Berry phase of the topological surface states. The magnetoconductance data of a 5 nm Bi(2)Te(3) film suggests that a crossover from symplectic to unitary classes is observed with the deposition of Fe impurities.     

新型槽栅nMOSFET凹槽拐角效应的模拟研究

应用二维器件仿真程序PISCES Ⅱ，模拟计算了新型槽栅结构器件中凹槽拐角效应的影响与作用，讨论了槽栅结构MOSFET的沟道电场特征及其对热载流子效应、阈值电压特性等的影响.槽栅结构的凹槽拐角效应对抑制短沟道效应和抗热载流子效应是十分有利的，并且拐角结构在45°左右时拐角效应最大.调节拐角与其他结构参数，器件的热载流子效应、阈值电压特性、亚阈值特性、输出特性等都会有较大的变化. 关键词： 槽栅MOSFET 拐角效应 阈值电压 热载流子退化     

GaAs1-xSbx/GaAs单量子阱的光学特性研究

用选择激发光荧光研究了分子束外延生长的GaAsSb/GaAs单量子阱的光学性质，第一次同时观察到空间直接(Ⅰ类)和间接(Ⅱ类)跃迁.它们表现出不同的特性：Ⅰ类跃迁具有局域化特性，其发光能量不随激发光能量而变；Ⅱ类发光的能量位置随激发功率的增大而蓝移，也随激发光能量的增加而蓝移，复合发光发生在位于异质结GaAs一侧的电子和GaAsSb中的空穴之间，实验结果可以很好地用电荷分离造成的能带弯曲模型来解释，这也是空间间接跃迁的典型特性.还用光荧光的激发强度关系和时间分辨光谱进一步论证了GaAsSb/GaAs能带排 关键词： GaAsSb/GaAs 选择激发 Ⅱ类跃迁     

Simultaneous Determination of Antibiotics in Anti-Acne Cosmetics by Rapid LC with DAD

A suitable method that allows, for the first time, the simultaneous determination of nine antibiotics which may help the therapy of acne vulgaris by rapid liquid chromatography with diode array detection in 7 min is presented in this work. An SB RP18 (50 × 4.6 mm; 1.8 μm particle size) column was used with the mobile phase consisting of a mixture of 0.1 mol L^?1 potassium dihydrogen phosphate (pH 2.5) and acetonitrile at the gradient elution program. The correlation coefficients were all above 0.9999 in the linear range between 4–100 μg mL^?1, the average spiked recoveries (n = 6) were 92.2–103.2% with RSD ranging from 0.04 to 4.5% depending on the target analytes. The method detection limits were in the range of 0.02–0.2 μg mL^?1 in anti-acne cosmetics. The analysis of real cosmetic preparations demonstrated the fitness for the whole analytical procedure. The proposed method appeared therefore as a sound alternative for official testing method, which could overcome the general problems of time consuming, lack of the specificity and precision difficulty.