基于人工神经网络的实时短期负荷预测系统

应用人工神经网络设计短期电力负荷预测系统,利用广州电网的负荷数据进行仿真,分别作出提前１小时和未来２４小时的整点负荷预测,获得了比较满意的预测精度,显示出人工神经网络应用于短期电力负荷预测的良好前景。由于建立小时模型,改进了训练样本集的选取办法及采用高效率的ＬＭ训练算法,使ＡＮＮ的训练速度大大加快,形成可以实时训练和预测的ＡＮＮ－ＳＴＬＦ系统。     

应用递归人工神经网络预测电力短期负荷

介绍了神经网络的基本原理,使用递归人工神经网络模型对电力短期负荷进行预测,采用了梯度下降法,来提高训练的收敛速度,预测仿真结果表明,使用递归神经网络预测比传统的预测方法更准确.     

基于内置式物理模型的人工神经网络纱线质量预测模型

-Sirolan—Yarnspec是由CSIRO在20世纪90年代研发并作为一个有效的纱线质量衡量工具在工业作用．最初的Sirolan—Yarnspec是一个理念模型，它基于纤维特性和纺纱工艺预测世界最好纱线质量．过去的几年来，工业界提出要求，希望能够建立工厂特殊预测模型．为此，本文使用人工神经网络建立纺纱预测模型。为了克服人工神经网络预测的不准确性，使用了一种新的方法，即在人工神经网络模型中嵌入Yarnspec理论中的物理知识．预测结果表明，经过物理知识优化后的人工神经网络的预测精度有明显的提高．     

A REAL_TIME SHORT_TERM LOAD FORECASTING SYSTEM BY ARTIFICIAL NEURAL NETWORK *

应用人工神经网络（ＡｒｔｉｆｉｃｉａｌＮｅｕｒａｌＮｅｔｗｏｒｋ—ＡＮＮ）设计短期电力负荷预测（Ｓｈｏｒｔ＿ｔｅｒｍＬｏａｄＦｏｒｅｃａｓｔｉｎｇ—ＳＴＬＦ）系统,利用广州电网的负荷数据进行仿真,分别作出提前１小时和未来２４小时的整点负荷预测,获得比较满意的预测精度,显示出人工神经网络应用于短期电力负荷预测的良好前景．由于建立小时模型、改进了训练样本集的选取办法及采用高效率的ＬＭ（Ｌｅｖｅｎｂｅｒ＿Ｍａｒｑｕａｒｄｔ）训练算法,使ＡＮＮ的训练速度大大加快,形成可以实时训练和预测的ＡＮＮ＿ＳＴＬＦ系统．     

局地短期气候预测的关联度方法

针对局地短期气候变化的非线性特征及其难以用模型准确刻画的现状 ,根据预报误差最小原理 ,引入关联度分析 ,提出了一种关于局地短期气候预测的关联度方法 .应用此方法对年际变化剧烈的蒙自 5月雨量进行了预报试验 ,预测结果令人满意 .     

基于神经网络的严寒地区建筑PMV预测研究

为研究严寒地区建筑热环境和人体热舒适,于2004年9月至2005年12月在哈尔滨进行了20次现场研究,测量了室内热舒适参数.利用人工神经网络方法,建立了严寒地区建筑PMV的BP神经网络评判模型,实现了对严寒地区建筑热环境内PMV的智能化预测.现场研究结果验证表明,该模型预测的严寒地区建筑热环境内PMV与实际主观调查吻合.     

基于BP网络的水资源预测方法的研究

对水资源预测的各种方法进行了分析，在本领域内推出一种新的预测方法－人工神经网络，可依据源数据，通过BP算法，自动形成水资源预测模型，从而推算出水资源变化趋势。人工神经网络有较强的学习功能，事先不需建立模型，而是根据预测的精度通过初始数据进行计算。从本文所得结果可以看出，人工神经网络是建立水资源预测模型的一种有效的方法。     

最小二乘支持向量机的短期负荷多尺度预测模型

提出了一种改进的电力负荷短期预测小波网络模型，该模型采用最小二乘支持向量机(LS-SVM)实现了小波分解系数的多尺度组合预测．首先使用多孔算法对短期负荷序列进行小波分解，得到指定尺度下的近似系数和相关尺度下的小波系数，然后利用LS-SVM对预测点的系数进行多尺度组合预测，通过小波重构可以求得相应的预测值．结合某地区短期负荷需求数据进行了仿真试验，研究了预测点与历史记录数据的相关关系．预测结果表明，使用本模型进行短期负荷预测同比传统小波神经网络方法可以获得更好的预测精度，同时LS-SVM的引入大大提高了模型的可计算性．     

多层前馈神经网络在电力系统短期负荷预测中的应用

介绍了多层前馈神经网络在电力系统短期负荷预测中的应用,并对这些方法做了评价.在此基础上,对人工神经网络技术在短期负荷预测中的应用进行了展望.     

安徽省某地区中长期电力负荷预测

以安徽省某地区2007-2014年用电量数据作为训练测试样本,采用灰色预测法、人工神经网络预测法和基于人工神经网络的最小二乘支持向量机（LSSVM）预测法计算其均方误差,结果表明,用基于人工神经网络的LSSVM预测法计算出的均方误差整体上比其他2种预测法要小.选用基于人工神经网络的LSSVM预测法对该地区2015-2017年的用电量进行预测,预测数据与实际数据基本接近.     

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