球形压痕法测材料力学性能:神经网络模拟

讨论利用球形压痕法对材料的力学性能参数进行估算时外载P和压入深度h的关系．分析了带动量修正的前馈式反向传播型神经网络的特点，通过已知的P—h关系建立神经网络系统，利用球形压痕法得到的计算结果作为训练数据对神经网络进行训练，通过训练好的神经网络模拟了球形压痕法的计算结果．利用训练5000次基础上得到的神经网络对球形压痕法所得结果进行了模拟，分析并比较了利用神经网络方法得到的结果与通过球形压痕法得到的结果．结果表明，神经网络可以很好地模拟利用球形压痕法分析得到的材料局部力学性能参数．     

基于相空间重构和非参数神经网络集成股市预测研究

利用奇异谱分析方法对股市时间序列重构，降低噪声并提取趋势序列，并利用C-C算法确定嵌入为维数和延迟阶数进行相空间重构，生成神经网络的学习矩阵，进一步利用Boosting技术和不同的神经网络模型，生成神经网络集成个体，最后采用非参数回归模型进行集成，建立多元变窗宽高斯核函数的非参数回归的神经网络集成模型，以此建立股市预测...     

DSP在模糊神经网络控制器中的应用

将模糊控制所具备较强的逻辑推理功能和神经网络的学习功能融为一体，组合而成模糊神经网络，通过预测神经网络和模糊神经网络的协调作用，利用梯度法可以实时地调整模糊神经网络每个隶属函数的参数值。     

一类非线性系统反馈线性化的遗传神经网络实现

利用Ｈｏｐｆｉｅｌｄ反馈神经网络对一类仿射非线性系统进行反馈线性化，然后利用常规的ＰＩ控制方法设计控制器，同时指出，利用神经网络不仅可以对系统的状态进行辨识，而且可以辨识其相对阶数，并给出了完整的证明，在训练神经网络时，提出了一直直接基于寻优参数的遗传算法ＤＰＧＡ，仿真结果说明了该线性化方法的有效性。     

一种再增强模糊神经网络控制器的建立

利用模糊控制的推理功能使神经网络得以简化，减少了学习单元的数量，提高了收敛速度．利用神经网络的并行特点使模糊控制表更容易实现，利用ＢＰ算法为自适应模糊控制提供了一种通用的规则再增强自适应算法．仿真验证了这种再增强模糊神经网络控制器的合理性．     

二次最小化问题的有限时间递归神经网络求解

利用一类递归神经网络模型来求解二次最小化问题，在该模型的基础上加入双符号幂激励函数，以加快递归神经网络的收敛速度，甚至达到有限时间收敛.通过调节设计参数λ的取值，递归神经网络的收敛性能可进一步提高.利用MATLAB软件对有限递归神经网络模型进行仿真，数值仿真结果验证了模型求解二次最小化问题的有效性和优越性.     

煤与瓦斯突出灾害的预测——基于遗传和BP算法

分析了煤与瓦斯突出的非线性动力系统行性和因素指标，利用神经网络的BP算法解决突出的主要性能指标和突出灾害等级的非线性网络连接，特别是利用遗算法的全局优化能力，对神经网络的连接权值、拓扑结构等进行进化操作，设计出具有较好性能参数和全局搜索能力的神经网络模型，同时神经网络也可用地遗传算法的进化训练，遗传算法和神经网络的融合优化了煤与瓦斯突出灾害预测模型，并且该方法对其它灾害预测也有借鉴意义。     

基于BP神经网络的数字图像边缘检测算法的研究

指出了传统边缘检测算子算法的不足，提出了一种利用基于BP神经网络的数字图像边缘检测算法，即利用传统边缘检测算子检测出来的图像中像素的灰度的不同比例作为学习训练图像，进行神经网络的学习训练，改变神经网络的结构参数得到神经网络的模型参数，最后给出了BP神经网络实现图像边缘检测的实验研究结果。从实现中可发现，将人们关于边缘特征的先验知识包含在内进行数字图像的边缘检测，能够取得比较好的效果。     

关于时滞细胞神经网络全局稳定性的一些注记

首先证明具有时滞的细胞神经网络平衡点的一个存在性定理．然后，利用这定理分别得到该类神经网络的全局渐进稳定性与全局指数稳定性的判据各一个．最后，给出利用所得的新判据判别时滞细胞神经网络的全局稳定的两个例子。     

一种应用神经网络技术的威胁估计算法

在对现有威胁估计算法分析的基础上，结合神经网络技术，提出了于BP神经网络模型的威胁估计算法，利用神经网络良好的自适应能力和自学习能力，通过样本数据训练，提高威胁估计算法的准确性和适应性。     

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