配网自动化的规划及实施

目前正在进行的城市及农村电网改造,对实施城市配网自动化技术及提高可靠性水平提供了良好的机遇。文章根据对江门市电网现状进行详细分析,提出了配网自动化的总体规划、配网改造及配网自动化实施注意事项。     

论配网自动化系统规划及实施中应注意的问题

在电网建设中配网自动化系统是一项综合性工程,随着城市及农村电网的改造,配网自动化系统为城市配网自动化提供了可靠性的技术水平,为此,本文作者就配网自动化的总体规划、配网改造及配网自动化实施中应注意事项进行了分析。     

对城市配网自动化系统技术特点的探讨

城市规模的不断扩大,要求原有的供配电系统在不断增容和扩容。本文针对目前城市电网现状并结合城市电网建设规划,提出了建设适应现代化需求的城区配网自动化系统的解决方案。     

电网建设中配网自动化规划及改造的问题分析

随着城市及农村电网的改造，配网自动化系统为城市配网自动化提供了可靠性的技术水平，为此，对配网自动化的总体规划和配网改造以及配网自动化实旋中需要注意的一些事项进行详细分析。     

浅析海口配网自动化的现状及发展

经济的发展对配电网提出了更高的要求,配网自动化也成为电力系统智能发展的必然趋势。按照海南建设国际旅游岛的总体要求及海口配网自动化建设的实际需求,结合智能电网建设的契机,对海口配网自动化发展提出个人见解。     

电力系统配网自动化常见问题的探讨

随着电力事业的迅速发展,用户对供电质量和供电可靠性的要求越来越高。电网改造将给配网自动化技术与可靠性水平带来前所未有的发展机遇,电网应在未来的几年内加速配网自动化系统建设,提高供电质量和供电可靠性,以满足现代化建设的供电需求。因此,我们应该及早规划建设适应现代化需求的配网自动化系统。本文针对电力系统配网自动化常见问题进行探讨、分析,并提出个人观点,以供参考。     

新形势下的配网规划与设计

分析了城市配网现状及配网规划中存在的一些问题,结合当前形势,从负荷预测、主配网协调、供电半径、电源点、配网网架和配网自动化等方面提出了城市配网规划与设计的一些思路。     

浅析城市配网自动化管理工作的问题及治理措施

由于配网自动化是电网运行中的一个重要部分,因此配网自动化管理水平对于配电网是否安全稳定运行有着至关重要的作用。当前,电力企业已将先进的自动化技术引入城市配电网的管理当中。对于配网自动化的运行管理工作,一方面要加强对于软件的应用,另一方面要加强配网自动化管理水平。在运行管理中,要积极组织相关人员进行分析与探讨,对相关问题给出有效解决方案,从而保证配网工作顺利进行。该文在分析了当前配网自动化管理中存在的主要问题的基础上,提出了城市配网自动化管理的具体策略。     

城镇电网规划的研究

本文简要介绍了城镇电网规划的任务及其内容、遵循的原则及其实施的步骤,对城市电网规划的方技术要点,包括负荷预测方法、变压器选用原则、配网的一次规划、配网的二次规划等问题进行了详细的论述,同时针对现状提出了城镇电网规划设计应注意的问题.     

对城市配网建设中的若干问题探讨

随着社会的发展,城市配网建设也处在不断的发展之中,随着城市配网建设的不断深入,再加上城市电网本身固有的特点,在城市电网建设施工中,遇到了许多问题.很长一段时间以来,在城市配电的建设中,都存在着这样一些问题,即自动化水平极低、配电变压器容量不足、无功补偿严重不足、绝缘水平低、导线截面太小、供电半径太大、装备陈旧落后以及网络混乱薄弱,这些问题的出现使得我国城市配电网的建设变得十分的脆弱.因此必须对城市配网建设中的重点问题进行探讨,加快城市配网的建设与发展.     

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-