用四单元电容传感器测量绝缘纸板微水分分布

由于变压器绝缘纸板中的微水分影响其介电特性,用介电方法可以测量绝缘纸板微水分分布.测量系统采用一种有4个感应深度不等的测量单元的电容式传感器,轮流使用各测量单元可获得绝缘纸板的对应导纳,再利用绝缘纸板截面上分布测点的等效导纳,推导出绝缘纸板不同深度层上的介电特性,通过适当标定后,该测量系统可以用于估算被测绝缘纸板某深度的含水质量分数.试验证明了其使用效果.介绍了传感器的原理、结构及测量系统的构成.     

π网络法石英晶片电参数计算机测量系统

分析了基于ISA总线接口的π网络法石英晶片电参数测量原理、石英晶片的等效电路和使用π网络法测量石英晶片电参数的基本原理,提出了一种使用直接数字频率合成器(DDS)作为激励信号源的方法和以此为基础实现石英晶片电参数计算机测量系统结构的途径;使用Visual C 6.0多线程、动态贴图、实时数据库等技术设计了测量系统计算机应用软件,设计了用多线程进行数据采集的实现思路和关键程序,用动态贴图技术实现.通过分析石英晶片频率特性,获得其谐振频率、寄生频率、相对活力、杂波数等多种电参数.研究结果表明,用π网络法设计的石英晶体电参数计算机测量系统,测量精度高,系统性能稳定、可靠.     

正弦扫频电激励法测量与识别地震检波器特性参数

依据动圈式地震检波器的互易性质,将检波器的电特性与力学特性相结合,提出了用正弦扫频电激励测量动圈式检波器特性参数的新方法,建立了这一方法的数学模型;以此为目标函数,对实测频率响应函数进行了曲线拟合并确定了检波器的特性参数;分析了影响测量精度的各种因素.理论分析、实验结果和与振动台激励方法的比较结果均表明,此方法稳定性好,精度高,测试系统简单,适合于检波器生产、维修和施工检测使用.研究结果为便携式检波器特性参数测试仪的研制提供了新的依据.     

石油原油含水率测试仪的设计

采用具有高性能、低功耗特点的MSP430单片机作为主控芯片,结合物质的介电系数与电容器电容量成正比特性,用双线绕电容传感器测量,设计出智能化的低功耗石油原油含水率测试仪.使用数字拟合的方法对测量数据的非线性和温度漂移特性进行了修正和补偿,将测试结果在液晶显示屏上显示.本系统的最大特点是使用的双线绕电容传感器进行数据采集,能够测量多种物质的含水率.     

微机在微波测量中的应用(相对介电常数的自动测量)

本文论述了微机在微波测量中的实践。利用有效的方法和显示程序编写了测量相对分电常数的控制程序。并将程序固化于EPROM中。利用其附属设备实现了介质相对介电常数的自动测量。用一块EPROM软件可测介电常数范围1～8或8～17等。     

用双脉冲测量铁电薄膜的开关特性与电滞回线

分析测量了铁电薄膜的开关特性.介绍了测量铁电薄膜开关特性的重要仪器——双极性双脉冲发生器,以及利用双极性双脉冲测试铁电薄膜电滞回线的原理.这种电滞回线比用常规测量方式所测出的电滞回线更能真实地反映出铁电薄膜的特性,同时还能反映出铁电薄膜的极化转向过程.     

天线罩测量和修磨机床软限位系统设计

以天线罩壁各处电厚度一致为目标对硬脆材料复杂形面天线罩进行精密测量和修磨,属于自由曲面的精密加工范畴,其测量和加工要使用专用数控机床。在天线罩测量和加工过程中,为保护机床和天线罩,需加入测量和加工软限位程序。即首先根据天线罩的外轮廓母线方程求出内轮廓母线上对应的点,然后把求出的点作为节点求出内轮廓母线的三次B-样条曲线方程,并把此曲线作为控制线,设计出测量和加工软限位程序。把该程序应用于测量和修磨加工过程,取得了良好效果。     

精矿粉电特性与含水量的关系

对精矿粉的电阻、电容、品质因数及综合电特性与含水量的关系进行了系统的研究,得到了精矿粉的各种电特性随含水量变化的对应关系以及测量间距对其的影响,为利用精矿粉的电特性测量其含水量提供了理论基础.     

园直径的电测方法

本文叙述了非完全透光的园直径的电测方法,并推导出了计算公式,设计出了实际的测量电路及有关程序。     

用双脉冲测量铁电薄膜的开关特征与电滞回线

分析测量了铁电薄膜的开关特性，介绍了测量铁电薄膜开关特性的重要仪器－双极性双脉冲发生器，以及利用双极性双脉冲测试铁电薄膜电回线的原理，这种电滞回线比用常规测量方式所的电滞回线更能真实地反映出铁电薄膜的特性，同时还能反映出铁电薄膜的极化转向过程。     

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-