基于LabVIEW的电能质量监测实验平台设计

构建了基于NI公司PCI-6024E数据采集卡、BNC-2120接线盒和Lab VIEW软件的电能质量监测实验平台,设计了硬件系统和软件系统,借助于Lab VIEW强大的数据计算能力和图形化显示功能,运用快速傅里叶变换、对称分量法等算法实现了对电能质量各项参数的分析计算。本实验平台既可以加载Lab VIEW软件生成的模拟信号,也可以加载实际电网信号,实验结果表明:该平台测量准确度高、计算速度快、结构可靠、实用性强。     

基于Lab VIEW的简单信号发生器的设计

信号发生器是实验教学、生产实践和科学研究中不可缺少的通用电子测量仪器之一,主要用于产生具有不同频率和幅度的各种波形,为实验研究提供所需要的特定信号。为此设计了基于Lab VIEW控制的信号发生器。通过USB接口连接已有的便携式信号发生器,在上位机上使用Lab VIEW所生成的应用程序,对小型信号源进行控制,实现双通道不同频率和幅度的各种波形,达到便携简单方面的效果。该文主要从Lab VIEW软件设计方面和利用VISA进行软硬件通信方面进行介绍,提出了优化方案,给出了实验结果并对结果进行了分析。     

在LabVIEW下基于调用DLL的压缩机气缸压力信号的采集

为实现活塞往复压缩机气缸内压力信号的采集,研究了Lab VIEW调用外部代码的方法,即库函数节点CLF调用外部的动态链接库和代码接口节点CIN调用C源代码,介绍了在虚拟仪器软件开发平台Lab VIEW上调用动态链接库的技巧及过程,实现了具有DMA直接内存访问功能的数据采集模块USB20D的通信。实践证明,基于动态链接库的Lab VIEW数据采集系统简单易行,运行效率高,使Lab VIEW强大的图形化编程和数据处理功能与非NI公司的数据采集设备结合而进行数据采集。     

基于USB接口的虚拟示波器的设计

在详细地讨论虚拟仪器系统的功能特点的基础上,给出了虚拟仪器系统构建所需要的硬件及软件技术,介绍了一种以USB控制器为接口的实现Lab VIEW虚拟仪器和PC之间的高速USB通信的虚拟示波器设计方法。设计给出了在Lab VIEW环境下测试软件的设计思想,以及利用Lab VIEW软件的模块化编程以及多线程技术框架,实现了多种常见周期信号及任意指定信号的多通道输出。     

基于LabVIEW的数字电路虚拟实验设计

根据数字电路的特点,在实验教学中引入了虚拟仪器平台。以触发器虚拟实验为例,阐述了基于Lab VIEW的数字电路虚拟实验设计的原理及方法。利用Lab VIEW进行数字电路仿真实验,不仅弥补了传统实验的不足,丰富了教学方法与手段,还增强了学生学习兴趣,提高了教学质量。     

虚拟数字存储示波器设计

给出了一种基于Lab VIEW的虚拟数字存储示波器设计方案,硬件部分由衰减和增益控制、A/D转换、采样控制和数据存储4部分构成,软件部分基于Lab VIEW平台搭建。能够实现7档垂直灵敏度、18档扫描速度、7种触发方式自由选择,完成对信号的采集、分析、处理和显示等功能。经过正弦波、方波和三角波3种信号实验测试,结果表明虚拟数字存储示波器运行稳定、性能良好。     

电子信息类专业课程远程虚拟实验平台的构建

利用Lab VIEW软件设计了电子信息类专业课程的虚拟实验平台,虚拟实验平台由电路原理、信号与系统、模拟电子线路、数字电子线路、数字信号处理等课程模块构成。利用Lab VIEW中的Web功能将实验平台通过网络进行发布,学生可以对虚拟实验平台进行远程访问,并进行课堂实验的模拟操作,实验数据存储在Access数据库中,方便学生随时调用。远程虚拟实验平台可以激发学生学习兴趣,有效提高实验教学质量。     

基于LabVIEW的涡轮增压器试验台测控系统的设计

利用NI公司的Lab VIEW开发环境,并结合PCI-6238数据采集卡开发一个数据采集与处理平台,用于实现涡轮增压器试验台的数据采集、处理、显示以及数据保存等功能.该系统具有简洁、友好的人机界面,可成功完成实验过程.     

Lab VIEW教学环境中数字钟的实现

数字逻辑电路中，数字钟的构建具有典型意义。通过利用Lab VIEW提供的布尔逻辑量及运算符来构成数字钟，分析在教学中用Lab VIEW对数字逻辑电路仿真的方法。     

基于声卡的数据采集系统

采用虚拟仪器的思想,设计了一种基于声卡的数据采集系统。该采集系统在Lab VIEW程序开发环境下,能够实现声音信号的采集、播放和识别等功能。实验结果表明:系统能够正确采集声音频率范围内的信号,可用于该范围内的一般数据采集与应用。     

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