带EBBA液晶的F—P腔的光学双稳态和多级双稳态

应用带EBBA液晶薄膜的F-P腔,激光感应折射率变化所提供二种竞争机制显示出光学双稳态和多级双稳态。从理论上分析了在液晶中由于激光感生热效应所产生的折射率变化。实验时采用了连续A~+激光器和EBBA液晶薄膜。     

一种OLED双稳态驱动电路的设计方案

以光电双基区晶体管为驱动器,设计了一种有机电致发光显示器(OLED)双稳态驱动电路的方案,通过实验得出了输入光功率和输出光功率的光学双稳态的特性曲线,并对该双稳态电路在OLED驱动的应用上进行了分析.     

三角架型四能级相干介质中的光学双稳态

主要研究了共振类系统中的三脚架型四能级原子介质被三个光场所驱动,然后将其放入单向环形腔的双稳态行为。通过研究发现驱动场和控制场的频率,合作参数,以及失谐量都能不同程度的影响光学双稳态的产生,还给出了双稳态的阈值宽度以及可调参数的取值范围,为实验上控制和实现光学双稳态提供了理论依据。     

物理系统的滞后回线与双稳态性质

以铁磁相变、非线性振动、光学器件等物理系统的滞后回线，引出一类物理系统的双稳态性质，讨论了这些物理系统双稳态性质的共性。     

F－P腔中的多种效应光学双稳态

提出一简单的理论模型用以Ｆ－Ｐ腔型的多种效应光学双稳态器件的最优化设计．给出影响光学双稳态的各种参数的最优化选择的理论解析表达式．以液晶为介质，按最优化设计制作的器件在实验上得到低达９０μＷ／ｍｍ￣２的临界入射光强的光学双稳态．理论计算的临界光强与实验值相当一致     

F—P腔中的多种效应光学双稳态

提出一简单的理论模型用以Ｆ－Ｐ腔型的多种效应光学双稳态器件的最优化设计。给出影响光学双稳态的各种参数的最优化选择的理论解析表达式，以液晶为介质按最优化设计制作的器件在实验得到低达９０μＷ／ｍｍ＾２的临界入射光强的光学双稳态，理论计算的临界光强与实验值相当一致。     

热处理SnO2薄膜光学特性的影响

用真空蒸方法在玻璃衬底上沉积ＳｎＯ２薄膜。在氮气,氧气气氛下对薄膜进行不同温度条件热处理,实验表明,热处理后薄膜的结构和光学性能均有了很大的改善。     

热处理对SnO_2薄膜光学特性的影响

用真空蒸发方法在玻璃衬底上沉积ＳｎＯ２薄膜．在氮气、氧气气氛下对薄膜进行不同温度条件的热处理．实验表明，热处理后薄膜的结构和光学性能均有了很大的改善．     

一种非线性光电反馈光学双稳装置的瞬态特性研究

自从Smith等人于1977年提出了“混合型”双稳装置以来,许多文献对此方案进行了改进。文献[8],[9]对线性反馈混合型光学双稳态的特性作了详细分析。此后李淳飞等人报道了一种非线性光电反馈的光学双稳装置的实验结果。随后他们又引入了静态稳定度来分析双稳态的稳定性。本文对文献[10]所提出的非线性反馈双稳态的开关时间     

SnO_2薄膜的制备及其光电特性

以高纯Sn丝为蒸发源,采用真空热蒸发法在石英衬底上沉积了厚度为205nm的金属Sn薄膜.随后,在高纯氧氛围中于200~500℃条件下进行氧化处理.利用X线衍射仪、拉曼光谱仪、分光光度计和数字源表测量了不同氧化温度下样品的结构、光学、电学特性.结构测量表明,不同氧化温度会产生不同结晶状态的氧化产物,提高氧化温度可得到单一、稳定的四方晶系SnO_2.光学测量结果证实,随氧化温度的升高,薄膜样品的光学带隙增大,电流-电压测试表明薄膜电阻率随氧化温度的升高而降低.     

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