摩擦磨损试验机计算机辅助测试系统的设计与实现

利用VB与Matlab混合编程，开发了一套基于PC机的摩擦磨损试验机计算机辅助测试系统．利用Matlab软件强大的数值计算及图形处理函数，实现了试验数据的滤波与动态显示、试验曲线的输出和图形移植，缩短了开发周期．介绍了测试系统的3大功能模块(数据采集模块、数据处理模块、采集数据的滤波及图形输出模块)的基本功能及实现手段，对测试系统软件设计过程中的难点问题，如采样时间控制、动态实时波形图的显示和数据的滤波等问题的编程思路作了详细的论述，并提供了部分源代码．     

基于VC的数据采集处理系统分析与设计

数据实时采集处理系统在工业现场应用广泛．本文主要介绍了基于VC的数据采集处理系统的设计，该系统主要包括硬件系统和软件系统，经实践检验该系统能较好的实现数据的实时采集、显示、存储及处理．     

用Matlab分析高速数据传输中的时钟抖动

提出了一种分析高速数据传输中时钟抖动的解决方案——Matlab方法．分析了高速数据通讯中时钟抖动产生的原因及对通信系统的影响，介绍了用TDS7000系列数字荧光示波器和Matlab捕获信号数据并随后对不归零制(NRZ)时钟信号进行简单抖动分析的方法，完成了高速数据通信中的时钟信号的采集以及时钟抖动的鉴定和分析．试验验证，本方法大大提高了抖动鉴定工作的精度和效率．     

基于LabVIEW与单片机串口的信号处理的研究

介绍了一种利用单片机采集数据，LabVIEW作为开发平台，二者之间通过串口实现数据通信的数据采集系统，利用LabVIEW的图形环境进行频谱分析。通过对Matlab的功能调用，对信号进行了滤噪处理。     

捷联式定位定向数据采集系统的设计与实现

本文介绍了一个用于侦察车定位定向系统中的多通道、高速、实时数据采集系统．系统采用双端口存储技术，实现了数据的高速采集与传输。文中从硬、软件两个方面讨论了实现的方法，并给出了具体的设计．     

内燃机离心式冷却水泵性能试验台数据采集系统设计

按照《ＧＢ１８８２—８２》的要求，根据水泵试验系统信号的特点，设计了相应的数据采集系统．讨论了频率量的测量方法，确定了频率量的采样周期．本文介绍了采集系统的硬件组成原理和软件设计特点．     

基于AVR单片机的数据采集系统设计

本文介绍了一套基于Matlab环境下的AVR单片机数据采集系统,其特点是成本低,采集数据速度快,实时性好。本采集系统使用了带有10位分辨率AD的微型处理器,接口电路采用USB接口,DA输出电路采用spi接口的DA输出芯片。     

数据采集系统FIR滤波器的MATLAB仿真设计与DSP实现

本文首先对数据采集系统的工作原理和FIR数字滤波器的基本结构进行了介绍,然后简述了Matlab中实现FIR滤波器设计的fir1函数法,最后结合具体实例,完成了FIR滤波器的MATLAB仿真设计与DSP实现并给出了部分实验程序与仿真结果。实验证明,该设计准确度高、灵活性好,具有较强的实用性与稳定性。     

基于PCIe接口的高速ADC采集系统设计

随着现代电子技术的快速发展,数据采集被应用于各行各业,并且在雷达测控以及医疗成像等领域需要采样率达到Gsps级别.为了提高实时信号采集的速度与准确性,在考虑到实时性与通用性情况下,设计一种具有FMC接口、5 Gsps采样率、10位分辨率的数据采集系统.该系统利用Kintex-7系列芯片作为核心芯片,控制E2V公司的高速ADC芯片EV10AQ190,采集的数据经过多相滤波算法,通过PCIe总线传输至上位机.文中对数据采集系统的方案设计进行了阐述,对数据采集系统进行验证,并与Matlab仿真进行对比,结果显示该系统可以达到数据采集系统的设计要求.     

基于CPLD教学CT实验仪数据采集系统的设计与实现

教学CT研制的目的,是为了更直观地演示CT扫描的全过程,其中数据采集系统的设计是整个教学CT系统研制的重点之一．文中主要介绍了CD-50BG教学CT实验仪数据采集系统的设计与实现,利用CPLD器件高集成度等特点,将其应用于数据采集系统的设计中,以达到减小系统体积、提高系统可靠性的目的;并针对CD-50BG教学CT机在采集数据过程中数据易丢失的现象,对数据采集系统进行了改进性的设计,增加了FIFO缓冲电路,在高速的数据采集过程中减少了数据的丢失,提高了数据传输的质量．     

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.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

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-