介质谐振器与悬置微带鳍线的耦合系数

介质谐振器具有体积小、重量轻、Q 值高、价格低廉的优点,特别是随着低损耗、高温度稳定性介质材料的发展,它已在很多场合代替了传统的金属腔.用介质谐振器制作滤波器、鉴频器和振荡器,其谐振频率及与电路的耦合系数是两个最重要的参数.本文采用集总参数耦合电路模型,分析计算了圆柱介质谐振器 TE_(01δ)模与悬置微带及单侧鳍线的耦合系数.1 理论分析介质谐振器与各种集成传输线的耦合,是谐振器中的场与传输线的场相互作用的结果(图1(a)).本文把介质谐振器的 TE_(01δ)模等效为磁耦极子,它与传输线盼耦合也就可以转化     

一种基于介质环谐振器的微波湿度检测模型

介绍了一种介质环谐振器的湿度检测模型.理论分析和仿真结果表明：TE011模并不总是湿度检测的最佳模式,在40%的湿度检测范围内采用TM011模会得到比较高的测量准确值;而在湿度大于100%的范围内,则宜使用覆盖范围广的HE211模测试.     

宽带圆柱形陶瓷介质谐振器天线

提出一种宽带的高介电常数圆柱形介质谐振器天线,并进行了分析与设计.采用在圆柱形陶瓷介质谐振器中穿孔及结合H形缝隙耦合馈电,有效地克服了高介电常数介质情况下工作频带较窄的缺点,获得了12.6%的阻抗带宽,并具有介质谐振器尺寸小的优点和较好的辐射特性.     

纵向填充不同介质的椭圆波导传播特性

在椭圆柱坐标系中，利用单介质椭圆波导电磁场解析解，对纵向填充两种不同介质的理想导体壁椭圆波导连接后的传播特性进行了研究，得到其模式场特征方程．结果表明，纵向填充两种不同介质的圆波导的电磁场模式特征方程是其特例．用数值计算方法研究了填充椭圆波导的介质折射率、波导的偏心率等对奇对称基模传播特性的影响，对波导中电磁波的传播特性及截止条件的讨论以及数值计算表明如此结构的波导有滤波作用．     

用于高温超导单晶微波特性测量的5GHz空腔介质谐振器设计

利用superfish软件设计了一个用于超导单晶微波测量的空腔介质谐振器.该谐振器基模为TE011模,共振频率为5GHz.谐振器中心打孔,单晶样品通过一介质棒伸到孔心.谐振器谐振模式得到了实验上的验证.     

基于AFSLR谐振器的三通带带通滤波器设计

提出了一种采用非对称叉形枝节加载的新型三模谐振器,并对该谐振器结构特性进行具体分析.该谐振器具有3个非谐波模式,可以通过调节非对称叉形枝节的电长度进行单独调节.利用该三模谐振器在0.8 mm厚的介质基板上设计了一种中心频率分别为2.08、2.42和3.04 GHz的紧凑型三通带带通滤波器,并且通过0°抽头馈线引进额外零点提高了滤波器的选择性和阻带抑制效果,测试结果与理论分析相吻合.     

圆柱腔TE011模端盖哑铃状孔—缝特性及其应用

介绍用微波谐振腔测量片状介质材料的电导率、介电常数和半导体非平衡载流子寿命的方法．对圆柱腔ＴＥ０１１模端盖上的哑铃状孔－缝的特性进行了研究，指出单个哑铃状孔－缝与ＴＥ０１１模耦合很弱，两个对称的哑铃状孔－缝与ＴＥ０１１模具有较强的耦合，后者可用于小损耗片状介质材料介电常数、半导体材料非平衡载流子寿命等参数的测量．因为测量是无接触的，所以无需对样品进行特殊加工．ＴＥ０１１模品质因数Ｑ值高，因而测量具有较高的精度．     

采用介质谐振器的高稳定度GaAs FET振荡器

在对介质谐振器特性及其反馈电路特性分析的基础上，采用微波集成电路技术研制出一种新型的用介质谐振器作为反馈电路且具有高频率稳定度的GaAs FET振荡器，并考虑了该振荡器的偏置电路，结果表明，该振荡器具有大于1000的外部品质因素；在振荡频率为11．85GHz，输出功率为70mW时，其效率为20％，大于1000MHz的调谐范围，用同样的微带电路形式，用5种不同的介质谐振器可以得到9－14GHz的振荡频率，在－20℃-60℃温度范围内可以得到低于150kHz/℃的高频率稳定度。     

微机械圆盘谐振器的结构分析

运用ANSYS对圆盘谐振器的结构进行有限元分析,并结合集总参数模型,确定了圆盘谐振器锚点尺寸与位置对圆盘谐振器性能的影响,包括谐振频率,振幅与品质因子(Q).在此基础上,提出了一种在圆盘谐振器高阶模式的节点环处做锚点的方案,不仅可以使圆盘谐振器工作在更高的谐振频率,同时也降低了微加工精度的要求.     

宽带叠层矩形介质谐振器天线的设计与仿真

应用宽带叠层贴片天线的设计原理,设计宽频带叠层矩形介质谐振器天线.在矩形介质谐振器和金属地板之间插入空气缝隙或低介电常数的薄介质片,可有效降低介质谐振器的Q值,展宽介质谐振器天线的带宽.所设计的矩形介质谐振器天线带宽达59.4%,天线带内增益在4.5～6.0dBi之间.仿真和实验结果对比验证了该设计原理的正确性及有效性.     

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.     

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.     

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.     

A computer generator for randomly layered structures

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

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.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

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.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to