纳米双栅MOSFETs的量子格林函数模拟

采用一种量子动力学模型研究纳米MOSFET(场效应管)电流特性.该模型基于二维NEGF(非平衡格林函数)方程和Poisson方程自洽全量子数值解.使用该方法研究了纳米双栅MOSFET结构尺寸对电流特性的影响.模拟结果显示:越细长的沟道,器件的短沟效应越弱,器件的亚阈值斜率随栅氧化层增厚而加大.另外,通过分析器件不同区域的散射自能效应,得出减缓纳米双栅MOSFET电流性能下降的途径.所用模型具有概念清晰,求解稳定等特点.作为多体量子模型,本方法可应用于一维量子线及量子点阵列所构成的纳米器件,并有望在纳米MOSFET器件设计中得以应用.     

多值拟线性椭圆型微分方程的近似解

作为非线性多值椭圆型方程的一个模型，讨论了一类多值拟线性椭圆型微分方程边值问题，给出了它的解的定义，证明了它的解及其近似解的存在性，以及近似解的收敛性，在数值实例中，还给出了求解的具体实施步骤，数值计算表明，理论分析与数值结果一致。     

多光束相干合成的研究

从傅里叶光学的基本理论出发，对多光束耦合的机理进行了理论分析，得出了光栅耦合的数学模型，根据模型用研制的优化软件对耦合器件进行了优化设计，并用特定设计的二元位相光栅作为耦合器件，在参与合成的各激光束之间满足一定的位相关系组态时，可实现将多束入射光相干合成一束能量较大的同轴高斯光束，给出了实验结果及有关的结论。     

多光束相干合成的研究

从傅里叶光学的基本理论出发，对多光束耦合的机理进行了理论分析，得出了光栅耦合的数学模型．根据模型用研制的优化软件对耦合器件进行了优化设计，并用特定设计的二元位相光栅作为耦合器件，在参与合成的各激光束之间满足一定的位相关系组态时，可实现将多束入射光相干合成一束能量较大的同轴高斯光束．给出了实验结果及有关的结论     

裂纹发电机转子轴系电磁激发主参数共振

建立了双质量裂纹转子扭振参数激励系统的数学模型。此模型以发电机产生的电磁力矩作为驱动源，应用多尺度法，给出了参数激励下的主参数共振解。通过对定常解平均方程的稳定性分析，得到了系统主参数共振解的幅频响应曲线。     

新型AWG的数值模拟研究

提出了一种新型的用作解复用器的阵列波导光栅(AWG)，采用自聚焦平板波导和普通的透镜作为输入和输出平板波导，用圆柱形阵列波导代替以前的方形波导。对整个器件进行了理论分析和数值仿真，并对器件的结构进行了优化，验证了设计的可行性。     

空穴传输层厚度对双层有机发光二极管性能的影响

建立了双层有机发光二极管中载流子的注入、输运和复合的理论模型。基于ITOlPEDOT／PSS作为空穴注入电极的双层有机发光器件ITOlPEDOT/PSSlTAPBlALq3LMg：Agl，采用较合理的无序跳跃模型来处理界面问题，数值计算并讨论了空穴传输层厚度的变化对器件性能的影响。结果表明：器件结构的变化导致电场强度在器件中的重新分布，从而影响载流子的注入、传输和有效复合，     

MOPSO算法在Boost变换器优化设计中的应用

为了提高Boost变换器的效率,节约系统成本,提出了基于多目标粒子群优化算法(MOPSO)的Boost变换器设计.首先分析了Boost变换器的功率损失,根据Boost变换器的设计要求,选择合适的MOSFET、二极管、电感和电容等器件,建立离散元器件数据库.以此数据库为约束条件,以功率损失、系统成本和体积为目标函数,建立了Boost变换器多目标优化设计模型,用MOPSO算法从几百种组合解集中寻找pareto最优解.基于折中分析,可为变换器做出合理的器件选择,以满足不同的设计要求.以光伏发电系统前级Boost变换器为例进行仿真研究,结果表明MOPSO具有处理离散多目标优化问题的能力,能在短时间内找到折中解,证明了该算法的有效性.     

交流粉末电致发光及其在神经网络中的应用

采用粉末型交流电致发光作为光神经器件构成光电混合型神经网络。测试了这种器件的亮度－电压，发光光谱特性，并给出了作为探测器的光敏电阻的光谱灵敏曲线。并提出了实现以Ｈｏｐｆｉｅｌｄ模型为基础的光电混合型神经网络的具体方案。     

分布式降雨径流模型率定的多目标分析方法

利用多目标方法，对自主研制的具有物理基础的分布式降雨径流模型进行了参数的多目标分析和模型有效性探讨．通过对参数的敏感性分析，确定糙率系数和土壤饱和水力传导率为率定的主要参数，选择效率系数、模拟洪峰的相对误差和洪峰达到时间的绝对误差为目标函数．在模型率定过程中，首先利用多目标最优化方法获得模型参数的非劣解集，然后又利用离散型协调规划从非劣解集中选出满意的模型参数，最后通过对非劣解集模拟的过程线的范围及形状的分析，对模型的有效性进行了评价．研究结果表明，多目标模型率定方法综合考虑了水文过程的各种要素，获得的满意解优于传统的单目标优选结果，非劣解集的聚合程度及模拟的过程线的范围能够反映模型的有效件．     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that