除盐水加药计量泵后加装排气阀的变更

三门核电一期工程酸碱间和加药间计量泵在维修后重启时，发现泵出口压力、流量不足，该文将对其原因进行分析，并给出解决方案。     

浅析水泵压力表损坏原因的探讨和解决对策

天富电力公司很多设备上都装有压力表，在运行中给运行人员和技术人员提供重要的参数。较为突出的是凝结泵，我厂有凝结泵六台，分别装于2#、4#、5#机，每机两台，一台运行，一台备用。为监视凝结泵的运行情况以及保证凝结水位的平衡，在每台凝结泵的出口都装有一块压力表，以供监视和调整凝结水出口阀门的开度。就这六台凝结泵，每年要打坏压力表近50块，平均每周打坏—块。每块压力表按55元计算，共计近2750元，全厂压力表损耗中，这块占了将近60％。     

石油化工装置安全阀的配管设计

以安全阀进、出口管路设计对安全阀性能的影响为出发点,综合国内外标准对安全阀安装位置和配置的要求,并结合作者多年设计经验,对石油化工装置安全阀的进、出口管道设计进行探讨。     

对电站锅炉安全阀常见故障的分析

文章介绍了电站锅炉安全阀的作用和特点,安全阀故障原因进行分析,并提出安全阀检修就注意的问题。     

液压支架安全阀开启压力值井下安全快速检测

介绍了利用手动油压泵对液压支架安全阀的开启压力值进行检测的方法,及时排出安全阀在生产过程中存在的安全隐患,具有一定的安全使用效果。     

用PLC和变频器实现给水加氨的自动控制

江苏新海发电有限公司2*330 MW机组锅炉给水加氨有3台给水加药泵,二开一备用,原有的控制器为单机控制,备用泵手动切换,设备老化,操作困难,设备故障率高,维护量大,为此,考虑采用变频调速技术进行改造,用PLC实现自动调节和各种控制功能。运行实践证明,该方案稳定可靠,经济效果明显。     

凝结水泵变频改造的方案及节能效果

以阳城国际发电有限责任公司安装的凝汽式汽轮机组为例,详细介绍了凝结水泵电机的变频改造方式及安全措施,对如何改变凝结水系统的运行方式也进行了阐述.     

浅析锅炉安全阀常见故障及解决办法

本文分析了锅炉安全阀阀门漏泄、阀体结合面渗漏、冲量安全阀动作后主安全阀不动作、频跳和颤振等常见的故障原因,并针对故障原因提出了解决方法。     

康索里德1700安全阀常见故障的原因分析

对德莱赛康索里德1700系列中的1749WB安全阀的整体分析,主要是对阀门各个关键部件的材料以及作用进行分析。由于安全阀的工作环境是高温高压,决定了其材料必须要求耐高温高压,有时还需要耐腐蚀。安全阀的密封面采用硬密封,所以要求阀芯和台阶密封面的加工精度要求较高。安全阀在实际运行中会发生许多的故障,这里着重分析安全阀泄露事故中比较严重的安全阀频跳问题。     

凝结泵变频运行分析

热电厂凝结水系统采用变频调节方式,对电厂安全运行与经济运行有很大的影响。本文首先介绍了凝结水系统采用工频节流调节的不利因素,接着介绍了本工程凝结泵所采用的变频调节的工作原理,最后总结了凝结泵采用变频调节的优势以及需要注意的问题。     

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.     

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.     

A computer generator for randomly layered structures

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

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.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

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.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to