立体声中的声像位置展开与界外声重发

本文首先从理论上分析了声级差型双通路立体声信号的声像位置扩展和界外重发方法;并且对重发中产生的声像深度增加效应作了解释。文中最后还证明了这种重发方式可以推广应用到AB型和假头型等双通路立体声信号的重发中。     

三维空间环绕声信号的(CD-4)盘式录声

文中提出一种三维空间环绕声信号的盘式录声的方法,并且证明了这种录声唱盘也能应用于四通路全景声、双通路立体声和普通单路声的重发系统中。     

三维空间环绕声的4-4-8重发和棱锥形重发

为了改进三维空间环绕声重发系统中的一些缺点,文中提出一种三维声的4-4-8重发方式,以消除声象在重发中并不完全均称和应用全景声信号重发时产生摺变现象等缺点。此外,文中还简略地描述了三维声的菱体重发和棱锥重发两种方式;这与4-4-8重发方式可以视为分别是方形排列、菱形排列和三角形排列平面声重发体系在三维空间的推广。     

南京市都市区声景观的城乡梯度演变分析

【目的】探讨南京市都市区声景观在城乡梯度变化下的空间特征，为声景观综合利用与科学规划提供参考。【方法】以南京市都市区为研究范围，对其进行城乡梯度的量化并设置研究样带，通过客观声级的测量，利用GIS软件对不同梯度下声景观进行分析评价。【结果】研究范围内声景观呈现明显的都市中心—城乡过渡带—乡村的城乡梯度分异与南北空间分异。声级以新街口为圆心向四周降低，呈先缓慢下降、后快速下降、最后趋于平缓的趋势，从市中心向东声级降幅最大而向西南方向最小。【结论】在城乡梯度视角下对声景观特征及演变分析可为研究区域声景观演变机制及空间规划设计提供参考。     

虚拟声重发系统的声场分析及应用

对虚拟声系统的重发声场进行分析与实验,证明了采用三扬声器5虚拟声重发系统可在一定程度上克服两扬声器系统的缺陷,其听音区域得到扩大,声像稳定性得到提高。并且指出,三扬声器虚拟声重发的方法可用于5．1通路环绕声的侧向声像重发、家庭影院的环绕声重发和室内声场可听化模拟。     

综合污染指数法评价声环境质量研究——以重庆市南岸区为例

噪声污染已成为当今城市重要的环境问题之一,如何准确评价声环境质量是控制、减轻噪声污染的前提之一.本研究构建综合污染指数法,评价2001—2010年重庆市南岸区城市区域环境噪声、道路交通噪声和功能区环境噪声.相比等效声级单因子法,综合污染指数法不但反映了等效声级的大小,还综合考虑了噪声起伏的变化、噪声污染级、受噪声影响的人群数、等效声级超标率、等效声级超标时间、等效声级超标路段长度、功能区的类别及面积等因素,更能反映声环境质量的实际情况,评价结果更合理.     

复杂网型平面控制网平差中的近似坐标推算方法

在简要阐述导线网、测角三角网、三边网、特殊三角形图形结构近似坐标推算的基础上,论述复杂网型平面控制网近似坐标推算,重点论述了复杂网型结构的约束条件、近似坐标推算的顺序等内容,并编写对应的平差程序,经过多个复杂网型的实践检验,结果完全正确,验证了方法的可靠性,解决了复杂网型的近似坐标推算问题。     

电话会议系统的合成立体声和声学回波消除

从理论上分析和比较了不同应用场合的电话会议系统中单通路传输音频信号立体声化的几种方法．利用简化的头相关传输函数对单音频信号进行处理,使之扩展为两路立体声信号,同时指出了这种方法存在的局限性和需改进的方面．另外,在论述自适应的多路回波消除问题和原因后,分析和比较了现有的几种消除结构,指出采用每空间一个滤波器的合成立体声回波消除结构,通过将合成主体声的方式与设置滤波器结合起来是今后发展的一个主要方向．     

非理想注入电子在平面型波荡器中的运动与辐射

对于平面型波荡器取一维近似,忽略光场对于电子运动的影响,给出了非理想注入相对论性电子在平面型波荡器中的运动方程,进而基于电磁辐射的一般理论基于Lénard-Wicherd势,导出了相应的电磁辐射的角度、频谱分布的表达式.     

平面环绕声的多声道扩展与效果分析

对现有的多种家庭三维声系统进行理论分析,提出一种新的五声道平面环绕声的多声道扩展算法.在主观听音实验的基础上,分别对五声道重放模式和多声道重放模式进行沉浸感、临场感、声像准确性、声音层次感以及空间感等5 个参数的主观偏爱度评分,分析两种模式下的听感效果.     

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