神经网络自调节变尺度算法及其用于聚酯生产工况预测

探讨了多层前向神经网络的学习算法，并将该算法用于大型聚酯生产工况预测。结合非线性最优化方法，提出了一种基于拟牛顿法的神经元网络自调节变尺度学习算法，仿真结果表明，该算法有效地改进了神经元网络学习收敛速度和收敛性能。     

不可测过程参数的智能化软计算方法及应用

为解决控制系统中存在的时变过程数学建模困难,有些过程参数难以在线实时检测的问题,研究基于过程神经元网络的不可测过程参数软计算方法。分析正交基函数展开的学习算法收敛速度慢的问题,将BP网络的改进算法引入到过程神经元网络的训练中,增加基函数展开系数的规一化处理、权函数动量项调整项,以及学习率自适应调整方法,改进算法明显消除了误差收敛曲线振荡和网络收敛速度慢的问题。该方法在污水处理过程出水水质BOD预测中网络训练速度快,取得较好的预测结果,是一种不可测过程参数智能化软计算的有效方法。     

一种过程神经元网络在管道土壤腐蚀速率预测中的应用

针对管道材料在土壤环境中的腐蚀速率预测问题,构建了一种基于过程神经元网络的动态预测模型.模型较好地模拟了金属在土壤环境中的腐蚀过程.文中给出了过程神经元网络预测模型和具体实现算法,对Q235钢管道材料在土壤中的腐蚀速率进行预测.结果表明:采用该方法得到的预测数据与实测值非常接近.验证了模型和算法的有效性.     

基于小波神经元网络模型的网损预测方法研究

提出了一种电力系统网损预测的新算法-小波神经元网络预测模型,它以非线性小波基为神经元函数,通过优化伸缩因子和平移因子确定对应务神经元的小波基函数,从而合成小波神经元网络,达到全局最优的拟合效果,克服了普通人工神经元网络学习速度慢、难以确定网络结构、存在局部极小点等方面的缺点,仿真结果表明,该方法准确,并可使学习速度大大提高。     

基于粒子群优化的过程神经网络学习算法

基于粒子群优化为过程神经元网络提出了一种新的学习算法。新算法在对网络输入函数和连接权函数进行正交基函数展开后,将网络中的结构参数和其他参数整合成一个粒子,再用粒子群优化算法进行全局优化。新算法不依赖于函数梯度信息,不需要手动调节网络结构。粒子群优化具有良好的全局优化性能和收敛性能,保证了过程神经元网络的全局学习能力和新学习算法的收敛能力,更好地发挥过程神经网络的逼近性能。两个实际预测问题的实验结果表明,基于粒子群优化的学习算法比现有的基于梯度的基函数展开方法以及误差反传神经网络模型具有更好的预测精度。     

基于复杂系统的短期负荷预测研究及系统设计

运用复杂系统理论分析电力系统.采用聚类方法对用电区域进行子系统划分,并通过改进的神经元网络算法和增加天气因素的预测方法进行短期负荷预测.通过算例和电力系统应用,证实了该算法的可行性,较显著地提高了负荷预测的准确率.     

基于局部权重及阈值调整算法的BP网络预测模型研究

通过对基本BP算法的分析,提出了一种基于局部权重及阈值调整的改进BP算法.结合该改进算法,讨论了在Matlab中创建基于BP网络的交通运输需求预测模型并使用该模型进行预测的过程.同时,将基于局部权重及阈值调整的改进BP算法和加动量项的自适应学习率BP算法的模型的预测效果进行了比较,比较结果表明前者的预测效果优于后者.     

基于隶属度函数的BP人工神经网络改进算法

为了实现基于BP人工神经网络的短期电力负荷预测,提出了一种基于隶属度函数的BP神经网络改进算法.算法是在学习率自适应调节算法的基础上,引入模糊数学中的隶属度函数的概念,根据不同的误差E,来确定不同的改变学习率的α和β,进而使BP神经网络的学习过程具有更好的自适应性,提高网络的学习速度.仿真试验结果表明,在预测精度不变的情况下,收敛性明显加快.由此证明.提出的基于隶属度函数的BP神经网络改进算法是快速和有效的,可用于短期电力负荷预测和各种类似的应用.     

神经元网络智能预测控制

本文基于自学习神经元网络模型，建立了智能预测控制系统，给出了网络系统的算法，阐明了智能控制器的设计以及自学习机理。仿真结果表明，方法具有良好的动态特性和鲁棒性，适用于大滞后系统和非线性系统。     

感知机的反向传播学习算法

本文讨论人工神经元网络的反向传播模型，用对称Ｓｉｇｍｏｉｄ非线性作用函数对感知机的反向传播学习算法进行了探讨。     

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