B2C电子商务网站综合评价

通过分析B2C电子商务网站评价指标设计的原则,制定了B2C电子商务网站评价指标体系,阐述了用神经网络对B2C电子商务网站进行评价的方法,并以一个实例来说明如何用神经网络方法评价电子商务网站.此方法在该应用领域具有一定的先进性.     

基于点击流的频繁模式聚类算法研究

在用户访问网站点击流形成频繁序列的基础上,提出基于距离函数的聚类分析算法.首先对数据流分区做K均值聚类生成中间聚类结果,然后对这些均值参考点进行离线聚类,以获取用户访问模式.理论分析和实验表明,算法具有较好的聚类效果.     

WAP商务网站的设计与实现

分析了WAP商务网站的现状和发展前景,对WAP商务网站的设计开发进行了详尽的模块规划.     

基于Web挖掘的电子商务推荐系统设计

本论述针对协同过滤算法的局限性,为顾客购买频度较高的商品设计一种基于Web挖掘的推荐系统,它综合利用朴素Bayesian分类法,基于点击流分析的偏好Web使用挖掘,商品关联规则等各种Web数据挖掘技术,为顾客购物提供智能商务推荐.在数据挖掘技术的基础上,结合智能Agent技术,对系统进行设计和实现.实验结果表明,该系统...     

经济欠发达地区中小企业商务网站建设对策

本文研究了随着互联网的发展和普及,以及在电子商务迅速发展的形势下,经济欠发达地区中小企业商务网站建设的必要性。通过分析经济欠发达地区中小企业商务网站建设的现状,提出了对经济欠发达地区的中小企业来说,以商务网站为平台,利用网络信息进行各种经济活动,寻求经济增长、建立竞争优势的对策建议。     

基于点击流信息的高校网络教育个性化信息推荐策略研究

高校网络教育个性化信息推荐服务就是要将学员感兴趣的信息主动提交给学员.本文基于点击流信息数据获取的方法和点击流信息的数据处理流程,从语法层次、语义层次和语用层次构建了基于点击流信息的高校网络教育个性化信息推荐策略.     

浅谈商务网站界面设计的交互性

随着科技的进步和商务网站的普遍应用,优秀的网站界面设计成为吸引用户的资本。本文从用户的生理、心理出发,充分挖掘用户浏览商务网站的一些目的和要求,明确用户在商务网站中的重要地位,简单分析了商务网站界面组成元素的交互性,提出了商务网站界面设计的基本原则。为设计更好的网站界面提供了重要参考。     

点击流数据仓库中的ETL技术

ETL是构建数据仓库的核心,点击流数据仓库无论在体系结构上,维表与事实表设计上,还是点击流的抽取、转换和装载机制上,都比传统的数据仓库要复杂的多。本文在总结了传统的数据仓库构建基础上,着重分析了点击流数据仓库的ETL技术,为以后在点击流数据仓库中进行数据挖掘做了准备。     

中小企业商务网站建设过程探析

研究了在网络信息的普及化及电子商务迅速发展的形势下,中小企业网站建设的必要性和可行性,探讨了它对企业信息化建设的积极效应,分析了企业网站建设发展趋势及其与传统营销相比的优势所在.为使企业更好地适应电子商务的发展,讨论了应如何帮助企业建立自己的商务网站,如何通过网站推广来开启电子商务之门,使之成为新时代的先锋者.     

中小型旅行社电子商务网站的设计

随着信息化的发展,旅行社网络化已经成为一种必然趋势。本文分析了中小型旅行社电子商务网站建设的必要性,确定了网站的定位和建设目标,根据旅行社发展的需求,设计了网站的功能和结构,并探讨了中小型旅行社电子商务网站内部网的管理。通过电子商务网站的建设,可以改进旅行社的管理,实现资源优化,从而增强企业的竞争力。     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the