合著者网络中的网络排名算法

为更加全面地评价一个作者在合著者网络中的影响力,借鉴已有的网页网络排名算法,提出了以H-因子为初值的New-LeaderRank算法,并以Paul Erdos合著者网络为例进行实证分析.与网页排名算法PageRank和社会网络排名算法LeaderRank对比分析,结果表明:New-LeaderRank算法能综合考虑某作者与其合著者的合作次数以及这些合著者对该作者的影响,为合理评价某作者在合著者网络中的影响力提供了一种途径.     

基于改进PageRank算法的微博用户影响力排序研究

针对传统的PageRank算法中存在主题漂移和偏重旧网页的弊端,提出了一种基于改进PageRank算法的微博用户影响力排序方法——TSPR算法.该算法将时间因素作为横向标度,采用TF-IDF方法计算网页间的相似度,并具体分析某个时间段用户搜索主题相似度的变化.通过计算网页PR值的大小,从而对微博用户影响力进行排序.仿真实验结果表明,该算法改善了微博用户影响力排序效果,与此同时,提高了搜索质量和准确率.     

基于加权词汇衔接的文档级机器翻译自动评价

在文档词汇衔接评价LC方法的基础上, 提出基于权重的LC, 即WLC, 该方法通过在文档词图上运行PageRank算法获得词汇权重。根据词性信息使得PageRank算法偏向特定的词汇, 并提出PWLC方法。实验表明, 在文档级别上, 所提出的两种方法与人工评价的相关度都优于LC; 融合两种方法后, BLEU和TER在文档级别上的评价性能有显著提高。     

PageRank高阶导向量的数学性质及其算法研究

提出了求解PageRank高阶导向量的两种新算法.讨论了PageRank问题系数矩阵的一些数学性质,并从理论上分析了两个公式求解PageRank高阶导向量的优劣.数值实验表明了新算法的数值性态.     

基于主题相关性和链接权重的PageRank算法

在基于链接分析的排序算法PageRank分析基础上,提出了一种基于主题相关性和链接权重的Page-Rank改进算法.该方法首先随机选取任一链出页面,通过主题相关性评价算法获得改进的PageRank值,并重新排序.实验结果显示该算法提高了查询速度、查询准确率,并且算法具有良好的稳定性和可扩展性.     

民族自治区综合性大学科技期刊高被引论文分析

基于中国知网的引文数据库,运用文献计量学方法,对民族自治区综合性大学科技期刊的高被引论文进行了分析评价.研究结果表明,统计的5种期刊之间的整体引用情况差异明显.高被引论文在各刊的分布并不均匀,所属学科差异较大,具有明显的区域特征.各刊要结合自身的学科、地域优势,有选择地组稿,提升期刊影响力.     

基于PageRank算法的期刊影响因子修正研究

为改善影响因子在期刊评价中的不足,基于PageRank算法给出一种期刊影响因子的修正方法.首先,建立期刊之间的互引网络矩阵计算PageRank值(简称PR值),并在期刊互引网络中利用各期刊载文当年的影响因子对被引次数进行加权以反映期刊质量,然后修正期刊自引数量,在此基础上构建基于PageRank算法的影响因子(简称WIF_PR因子),并以图书情报领域中43种期刊为实证对象,利用WIF_PR因子进行期刊评价.结果发现:WIF_PR因子能科学地考虑期刊自引数量、区分不同期刊被引质量,与影响因子、h指数相比,新评价方法评价效果更可靠.     

2000-2011年《资源科学》载文被引分析

依托中国知网提供的“中国学术文献网络出版总库”和“中国引文数据库”,从五个方面分析了《资源科学》2000-2011年载文的被引情况：被引论文的频次分布、被引论文的年份分布、施引与被引期刊情况、被引论文作者分布、高被引频次论文的主题分布,客观地评价了该刊的学术水平、办刊质量。通过分析可以帮助了解期刊出版的一些特点,分析期刊的优势与不足,提出提高期刊影响力的策略,并有助于分析资源科学学科热点问题以及学科发展的特点。     

PageRank算法的阻尼因子值

针对传统PageRank算法平均分配PageRank值给每个超链接网页这一缺陷,提出了改进的PageRank算法,并证明如果Web网的邻接矩阵P包含至少2个不可约闭子集,则非周期不可约矩阵的次特征值为d且至少2重.为了降低解PageRank近似解的误差和提高幂法的收敛速度,用lingo算得d取0.71,且知若采用改进的...     

农业科学研究影响力扫描

Science Watch对农业科学研究在过去10年间的发展状况作了评价。其中表1以总引文数和影响力(篇均引文数)两个指标对研究机构分别排序;表2列出了1996～2006年间农业科学领域获得最高引用数的前25名科学家;表3是被引用最多的15种农业科学期刊的名单。这些数据源于汤姆森科技公司的基本科学指标库,涵盖了被其收录的118种农业科学期刊上发表的论文(1996～2006年)以及其间被引用数据。     

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.     

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.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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-