橡椀栲胶进行锅炉水质处理

在党的“十大”精神鼓舞下,沈阳铁路局灵山机务段软水化验人员与辽阳栲胶厂的技术人员共同配合,采用橡椀栲胶于机车锅炉内进行了除垢和防垢的试验。经前进型1100号和PL,型66号机车初步实验表明,橡椀栲胶用于机车锅炉内进行除垢和防垢效果较好,方法简单易行,成本低,且对改善蒸气质量、防止锅炉腐蚀、减少水垢的结生是有益的。     

矿井水经电子水处理器处理后回用于锅炉的研究

电子水处理器是一种新型的防垢、除垢设备,等方面的影响,通过将净化后的矿井水经电子水处理器处理后,测定挂片上的结垢量的实验研究,探讨电子水处理器对该水质自理回用于锅炉的可行性。     

南六区三元油井钙垢期防垢剂ST防垢有效浓度研究

井筒化学防垢技术是提高三元复合驱油井检泵周期的有效途径之一,防垢剂的合理用量是有效、经济采取化学防垢的关键。从成垢体系组成角度考察了钙、硅、防垢剂用量对防垢剂ST防垢效果的影响。试验结果表明,随着评价体系中硅、钙含量增加,防垢率有降低趋势;ST防垢剂存在最佳有效防垢剂使用浓度;当硅离子含量≤150mg/L,防垢剂ST防垢效果与硅离子含量无关。南六区钙离子含量在10⁸0mg/L时,防垢剂ST有效加药浓度随体系中钙离子含量的增加而增加,两者存在函数关系Y=2.0695(C/10)2)-6.95(C/10))+40.857,与实验所得有效加药浓度平均偏差1.93mg/L。通过经验公式,单井加药量可降低20%以上,评价节省药剂用量31.05%,能够起到良好的防垢效果且节省了生产成本。     

智能防水垢器的设计及实现

主要介绍利用微电脑控制实现高频电磁场,使水中的水分子以及钙、镁盐晶体的物理性能发生变化,并与该电磁场产生共振,形成电磁场活化水,它具有防垢、除垢、杀菌灭藻、缓蚀的能力,该方法具有可实施性,是实现全自动防垢、除垢的一种较佳方法。     

智能防水垢器的设计及实现

主要介绍利用微电脑控制实现高频电磁场,使水中的水分子以及钙、镁盐晶体的物理性能发生变化,并与该电磁场产生共振,形成电磁场活化水,它具有防垢、除垢、杀菌灭藻、缓蚀的能力,该方法具有可实施性,是实现全自动防垢、除垢的一种较佳方法.     

大庆外围低渗透油田结垢分析及解决措施

分析了大庆外围低渗透油田成垢原因、垢对油田的危害及目前酸处理垢的弊端,提出了新的除垢防垢措施:采用中性络合除垢并与缓释型防垢剂配合使用,从而实现一次清垢、降低结垢速度,大大延长除垢周期,最终有效、经济、科学地解决大庆外围低渗透油田的“垢捆扰”。     

浅谈锅炉内水处理防垢防腐药剂的选择探讨

热水锅炉在我国应用广泛,使用单位对锅炉给水止于软化、除氧处理,不重视锅内水加防垢防腐药剂处理,导致结垢、腐蚀问题未彻底解决,后果严重。本文分类阐述锅内水防垢防腐药剂各自优点与不足,并介绍了相关的操作与注意要点。     

声空化作用下城市污水在碳钢管内结垢的研究

分析管道积垢对换热器的影响,研究换热管道污垢随时间的增长特性,并分析其形成过程;探讨各种因素下声空化技术在管道中的阻垢除垢效果.实验结果表明:换热光管在第5天时结垢量开始明显增大,直到第14天左右达到稳定;相同时间条件下,流速越大结垢率越小;当流速一定,超生作用时间为50 min时,防垢率可达到50%;超生作用时间一定时,防垢率并不是一直随着流速的增大而增大.     

关于帕尔曼声波发生器声波除垢的研究

介绍了帕尔曼声波发生器在声波除垢方面的机理,开展了相关的实验研究。实验研究表明,利用帕尔曼声波发生器产生的声波作用,可以有效地清除垢和防止垢结构的生成。现场应用研究表明,这种声波防垢技术是一种在工业上有效的除垢的方法。     

利用水平直管段静压测定蒸汽干度

在注蒸汽开采稠油时,蒸汽干度的大小不仅影响锅炉的安全运行,而且也直接关系到稠油的开采效果,因而可靠地且连续地测定蒸汽干度显得尤为重要。利用“锅炉机组水力计算”（标准方法）,通过测量水平直管段湿蒸汽的压差,实现了蒸汽干度的连续在线检测。同时分析了影响蒸汽干度的主要参数,提出使用该方法时注蒸汽锅炉蒸汽干度一般应大于０．４。该方法也可用于测定多歧管的蒸汽流量和干度。     

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.     

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.     

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     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

正~~     

Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has