Characteristics Analysis of Vertical Double Gate Strained Channel Heterostructure Metal-Oxide-Semiconductor-Field-Effect-Transistor

Since device feature size shrinks continuously, there appears various short-channel effects on the fabrication and performance of devices and integrated circuits. We present a vertical double gate （VDG） strained channel heterostrueture metal-oxide-semiconduetor-field-effect-transistor （MOSFET）. The electrical characteristics of the device with the effective gate length scaled down to 60nm are simulated. The results show that the drive current and transconductance are improved by 57.92% and 54.53% respectively, and grid swing is decreased by 36.83% over their unstrained counterparts. VDG MOSFETs exhibit a stronger capability to restrict short-channel-effects over traditional MOSFETs.     

Efficiency at Maximum Power Output of a Quantum-Mechanical Brayton Cycle

The performance in finite time of a quantum-mechanical Brayton engine cycle is discussed, without intro- duction of temperature. The engine model consists of two quantum isoenergetic and two quantum isobaric processes, and works with a single particle in a harmonic trap. Directly employing the finite-time thermodynamics, the efficiency at maximum power output is determined. Extending the harmonic trap to a power-law trap, we find that the efficiency at max/mum power is independent of any parameter involved in the model, but depends on the confinement of the trapping potential.     

集值上鞅的收敛定理及 Riesz 分解

本文给出了集值鞅的进一步性质;建立了集值上鞅外穿不等式;证明了一个集值上鞅收敛定理;研究了集值上鞅的 Riesz 分解.     

带随机过程的随机规划问题最优解集的过程特性与稳定性

本文证明了带随机过程的随机规划问题最优解集做为集值随机过程的可测性、可测最优解选择过程的存在性。研究了最优解集过程的平稳性、马氏性以及最优值过程的鞅性和最优解集过程的集值鞅性。最后，讨论了在有限维分布意义下最优解集过程对所含随机过程参数的连续性以及最优值过程的稳定性。     

2，5-二(2′-苯并咪唑)吡啶及其锌配合物的合成、结构与性能

本文利用微波法合成了2,5-二(2′-苯并咪唑)吡啶,采用水热合成技术得到了它的单晶(1)及其锌的配合物[Zn(C19H12N5)2(H2O)2].5H2O(2)。IR和X-射线单晶衍射实验测定和结构解析结果表明,化合物1由2,5-二(2′-苯并咪唑)吡啶和晶格水组成,化合物2中Zn2+离子与2,5-二(2′-苯并咪唑)吡啶的N原子配位,通过氢键作用形成1D链状结构,再通过配体间π-π作用形成三维结构。此外,TG和荧光测定分析表明化合物2具有良好的热稳定性和荧光性能。     

沟槽型发射极SiGe异质结双极晶体管新结构研究

提出了一种沟槽型发射极SiGe异质结双极晶体管新结构.详细分析了新结构中沟槽型发射极的引入对器件性能的影响,并对其机理进行研究.新型发射极结构通过改变发射极电流路径使电阻分区并联,在不增大结电容的前提下,有效减小发射极电阻,提高器件的频率特性.结果表明,新结构器件的截止频率和最大振荡频率分别增加至100.2 GHz和134.4 GHz,更重要的是沟槽型发射极结构的引入,在提高器件频率特性的同时,不会降低器件的电流增益,也不会增加结电容,很好实现了频率特性、电流增益和结电容之间的折中.对沟槽型发射极进行优化设计,改变侧墙高度和侧墙宽度.沟槽型发射极电阻不受侧墙高度改变的影响,频率性能不变;侧墙宽度增加,频率性能降低.     

石英微米晶粒电泳微柱的制备及其电泳分离

研究了内径2 mm石英管填充均匀石英微米晶粒的电泳微柱制备及其电泳分离的可行性.石英微米晶粒用水热法合成.含30%甲醇的1.5 mmol/L Na2HPO4为电泳缓冲液(pH 11.5),对无需衍生的色氨酸、苯丙氨酸和酪氨酸进行了微柱电泳分离和紫外吸收检测.检出限分别为0.038、 0.21和0.20 μmol/L; 色氨酸的分离效率为4.4 × 104塔板数/m,电泳微柱的样品容量达到35 μL, 且有较好的分离重现性.对未填充石英微粒, 填充平均粒度360 μm石英砂和长9 μm石英微米晶粒的电泳微柱的热效应进行了讨论.实验结果表明,在电泳微柱中填充石英微米晶粒可抑制大柱径电泳的热效应,增大样品容量,提高检测灵敏度.此微柱电泳技术可作为现场、实时和便携式电动流动全分析系统的高效分离手段,适合大体积和低浓度样品分析.     

烷基聚葡糖苷C9.6G1.3/n-C4H9OH/n-C6H14/H2O微乳液体系的介电弛豫谱研究

The pseudotertiary phase diagram of the microemulsion system alkyl polyglucoside/n-butanol/n-hexane/water was plotted at （30.0±0.1） ℃. The dielectric measurements, including permittivity, conductivity, relaxation strength, characteristic relaxation time, etc,, were applied to investigate the microstructure of the system. Unique dielectric relaxations were observed over the frequency range of 5-10^7 Hz, taking place possibly through an interracial polarization mechanism. According to the results obtained from dielectric spectroscopy, the structures of the microemulsion O/W, BC and W/O were determined, and some dielectric and phase parameters were calculated.     

丙烯酸酯单体修饰二氧化硅纳米粒子的制备

采用两步法将可聚合的乙烯基单体键接到S iO2纳米粒子表面合成了大分子单体.首先利用过量的甲苯-2,4-二异氰酸酯(TD I)对S iO2粒子表面进行化学修饰合成出表面带有高反应活性-NCO基团的功能化S iO2粒子(S iO2-TD I),再利用S iO2-TD I与丙烯酸羟丙酯(HPA)反应将碳-碳双键引入到S iO2粒子表面.系统考察了反应条件对TD I与S iO2反应的影响.此外,利用红外光谱和透射电镜对大分子单体进行表征,结果表明S iO2大分子单体能均匀地分散在甲苯中,没有发生明显团聚.