覆盖薄层介质质平面导体上的表面波

本文根据Ｃｏｌｌｉｎ提出的等效传输线电路法对薄层介质覆盖平面导体的表面阻抗、表面波传输衰减与介质参数的关系进行分析，并提出乘积μｒμｒ可作为薄型吸波材料抑制表面能力的品质因素。     

左手介质中表面波特性

针对电磁波在左手介质中的传播性质,研究了表面波产生的条件,得出了TE、TM偏振表面波波矢方程。利用麦克斯韦方程得出了表面波的色散特性、能流特性。分析表明非互补介质界面不能同时传播TE表面波和TM表面波。在界面两边介质里的能流方向相反。     

液饱和多孔介质中Rayleigh型波的传播

研究了由多孔固体骨架和无粘流体构成的多孔介质的瑞利型表面波的传播 ,获得了联系着复波数对频率的依赖关系的弥散方程 ,结果表明 :其表面波是弥散和非均匀的 ,表面波沿多孔介质表面衰减 ,同时其振幅远离介质表面呈指数衰减     

液饱和多孔介质中瑞利型波的弥散和衰减

研究了由一种多孔固体骨架和一种无粘液体构成的多孔介质的瑞利型表面波的传播,获得了联系着复波数对频率的依赖关系的弥散方程,其结果表明表面波是弥散和非均匀的,表面波沿多孔介质表面衰减,同时其振幅远离介质表面呈指数衰减.     

敷介质导体上空水平磁偶极子的电磁场

以波导口径或喇叭在导波面上激励表面波的问题归结为口径面上的等值面电磁流在导波面上激励表面波的问题。对于垂直极化波,归结为垂直电偶极子和水平磁偶极子在导波面上激励表面波的问题。Lo和Brick等人详细研究了垂直电偶极子在敷介质导体面上激励表面波的问题;讨论了位于介质数层中的水平磁偶极子激励表面波     

矩形晶片的楔形超声换能器瑞利表面波远场声压及指向性图案

在瑞利表面波理论基础上对常用的晶片形状为矩形的楔形超声换能器瑞利表面波的远场做了分析和实验,在理论上给出了半无限大各向同性介质表面的声压及指向性图案。对于钢介质,做了数字计算并进行了相应的实验测量,得到比较好的实验验证。     

微带结构中的表面波分析

由于微带结构复杂化和多样化,表面波对其影响也越来越复杂.分析了表面波的物理性质,从谱域格林函数出发,找出谱域格林函数的极点与表面波的关系,求得其中的表面波成份.为了便于分析,将谱域格林函数表示为TM模式和TE模式,并对TM和TE模式的极点分别进行提取.针对其极点的性质,对极点在上里曼面和下里曼面分别进行围线积分,从而有效地求解极点的留数,进而求出表面波成份.通过分析频率、介电常数和介质厚度对表面波的影响,得出电长度对表面波的重要作用,为改善微带结构的性能提供依据.     

带线法同时测量复介电常数和复磁导率

提出了可以宽频带扫频同时测量电磁介质的复介电常数εｒ和复磁导率μｒ的带线法，推导出了由带线网络的Ｓ１１及Ｓ２１表示εｒ及μｒ的理论公式．对带线夹具进行了设计，给出了铁氧体及吸波材料样品的测试数据．测试表明，带线法具有准确性高、特别适宜大损耗材料的测量和容易操作等优点．     

带线法同时测量复介电常数和复磁导率

提出了可以宽频带扫频同时测量电磁介质的复介电常数εｒ和复磁导率μｒ的带线法，推导出了由带线的Ｓ１１及Ｓ２１表示εｒ及μｒ的理论公式。对带线夹具进行了设计，给出了铁氧体及吸波材料样品的测试数据。测试表明，带线法具有准确性高、特别适宜大损耗材料的测量和容易操作等优点。     

Ni-P化学镀层配方影响抗冲蚀性能的研究

研究了在含ＨＣｌ与不含ＨＣｌ的介质中，三种不同配方的Ｎｉ－Ｐ化学镀层的抗冲蚀行为，并与不锈钢１Ｃｒ１８Ｎｉ９Ｔｉ和２Ｃｒ１３作了对比．试验在自制试验机上进行．结果表明，Ｎｉ－Ｐ镀层的冲蚀机理主要表现为片状剥落和微切削．而在含ＨＣｌ介质的冲蚀浆体中其抗冲蚀腐蚀性能要优于无ＨＣｌ介质的浆体中的情况．在Ｃｌ－与Ｈ＋构成的腐蚀介质中，Ｎｉ－Ｐ化学镀层冲蚀抗力要优于１Ｃｒ１８Ｎｉ９Ｔｉ与２Ｃｒ１３     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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-