基于线阵CCD的脱绒棉种色选机光学系统的设计

脱绒棉种色选机的检测系统是整台色选机的核心系统,而光学系统是其中重要的一部分,它关系到棉种能否在CCD光敏元上成清晰的像,从而直接影响色选机的色选精度。本设计主要采用柯拉照明系统以及与之相配合的物方远心光路作为光学成像系统的光路,对整个光学系统进行了理论分析。实验证明:利用此光学系统可以获得清晰的红种和合格棉的模拟电信号。     

基于MATLAB的大米色选处理

色选机是利用光电原理,通过电脑分析物体外表颜色,区分物品优劣的机械,是适应农业工程中的自动化的要求而发展出来的。为了验证色选方法的可行性,采用了MATLAB软件开发平台来构造基于CCD的大米垩白检测算法。在对不同的大米图像处理的基础上,完成了对大米垩白参数垩白度和垩白粒率的测定。实验结果表明,本算法及程序设计是有效可靠的。     

5MZX-96脱绒棉种色选机的设计研究

本文根据新疆棉种生产现状,提出一种新的棉种分选加工方式——色选,介绍了5MZX-96脱绒棉种色选机的结构组成、设计思想、设计原理以及一些主要的工作部件的研制及试验过程。     

一种快速Snort入侵检测系统研究

在高速网络中,提高入侵检测系统检测速率和效率是目前入侵检测系统需要解决的主要问题. 基于Linux平台,采用了零拷贝技术对Snort入侵检测系统的数据包捕获引擎进行了改进;采用改进的BM算法提高了规则匹配的效率,搭建了相应的实验平台并进行了性能测试. 测试表明,本方法可以显著提高Snort系统的性能.     

基于遗传算法的入侵检测系统特征选择方法研究

在入侵检测系统中,分类器所选取的特征对系统的性能有很大的影响,大量冗余和不相关特征的存在会降低系统的正确性和实时性,因此如何选取出最优特征组合成为研究的热点问题。在研究当前各种特征选择方法的基础上,提出了一种基于遗传算法的特征组合选择方法。使用遗传算法搜索特征空间,依据Fisher准则计算各种特征组合的分类能力,根据计算结果对特征组合进行选择、交叉、变异,通过多次反复迭代最终选取出最优的特征组合。在实验中分别使用全部特征和选取出的最优特征组合的进行分类验证,最终证明选取出的最优特征组合能够使入侵检测系统在保持高检测率和低误报率的同时具有较高的检测效率,提高了系统的整体性能。     

基于图像分析的数字图像色偏检测方法

为了克服传统方法在检测图像色偏上的局限性问题，提出了一种基于图像分析的图像色偏检测方法．并且在该方法的基础上，给出了一种基于图像子样的两步判别方法，既有效提高了算法的运行效率，又通过消除图像中主色调对色偏检测的影响，提高了检测的准确率和可靠性．依据所设计的评价试验，对大量不同主题的图像进行了评测．试验表明，文中所提出的方法与主观评测结果具有较好的吻合．在此基础上，成为一个数字成像系统图像品质评价工具，并在工程实际中得到了应用．     

基于硅光电池的大米色选分类方法研究

针对基于硅光电池的色选系统色选大米的快速性和高准确率要求,采用双因素方差分析方法分析了光源类型、大米下落速度、反光板角度等因素时硅光电池接收系统响应的影响.结果表明,光源类型对硅光电池接收系统响应具有显著影响,下落速度和反光板角度影响不显著.根据实验得到了蓝光光源、3m/s速度、3.6°反光板角度的实验参数.运用示波器对波形进行分析,证明了该方法的实用性.     

IBM算法及其在Snort系统下的实现

入侵检测系统匹配算法是影响检测效率的关键,为进一步提高系统性能和检测效率,对Snort系统采用的BM算法进行了改进,提出了IBM算法.该算法以两个字符为单位计算右移量,增大了文本串的滑动距离,有效地减少了匹配次数;将IBM算法应用于Snort,并在Windows平台下实现了基于改进算法的Snort系统.实验结果表明,该系统能够有效地检测各种攻击,与原系统相比检测效率有了明显的提高.     

用加权残值法确定光弹平面复合型应力强度因子

本文采用配线加权方法,选1/N~2r为加权函数,用全场等色条纹边界线确定断裂参量,适当修正麦克劳林-牛顿法来提高计算效率和精度.     

铁尾矿试制微晶玻璃的研究

研究了以选铁尾矿为主要原料，采用淬粒法工艺制作微晶玻璃的配方、熔化温度、晶化温度、保温时间等工艺参数，并对样品的性能进行了检测，分析了影响样品质量的主要因素。     

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.     

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-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that