表面活性剂对水玻璃砂性能的影响

为比较表面活性剂和化学改性剂对水玻璃的改性效果,使用了表面活性剂十二烷基磺酸钠和化学改性剂聚丙烯酰胺对水玻璃进行改性.实验结果表明,水玻璃的黏度随表面活性剂和化学改性剂的加入量增加而减小.当表面活性剂加入量为0.6%(质量分数)时,水玻璃砂的抗压强度最高,与化学改性剂相比,表面活性剂的改性效果有所提高.当改性水玻璃加入量为4%(质量分数)时,在吹气时间短时十二烷基磺酸钠对水玻璃砂溃散强度的改善效果优于聚丙烯酰胺,而在吹气时间长时,聚丙烯酰胺对水玻璃砂溃散强度的改善效果优于十二烷基磺酸钠.     

表面活性剂对水玻璃砂性能影响研究

为了比较表面活性剂和化学改性剂对水玻璃的改性效果,使用了表面活性剂十二烷基磺酸钠和化学改性剂聚丙烯酰胺对水玻璃进行改性。实验结果表明：水玻璃的粘度随表面活性剂和化学改性剂的加入量而减小。当表面活性剂加入量为0.6%时,水玻璃砂的抗压强度最高,跟化学改性剂相比,表面活性剂的改性效果有所提高。当改性水玻璃加入量为4%时,在低吹气时间时十二烷基磺酸钠对水玻璃砂溃散强度的改善优于聚丙烯酰胺,而在高吹气时间时,聚丙烯酰胺对水玻璃砂溃散强度的改善优于十二烷基磺酸钠。     

改性海泡石填充不饱和聚酯复合材料的热性能研究

采用表面活性剂对海泡石进行改性，用DTA分析研究了改性剂种类及海泡石用量对不饱和聚酯复合材料热性能的影响．试验结果表明，海泡石的加入可显著改善不饱和聚酯复合材料的热性能，且阳离子表面活性剂改性海泡石填充效果较好．海泡石的最佳用量在8％-11％左右．     

改性纳米碳酸钙在硬质PVC中的应用性能

在172 d的贮存期内,对经表面活性剂改性的纳米碳酸钙的粒径变化进行了考察,并对其在硬质PVC中的应用性能进行了测试.结果显示,经合适的表面活性剂改性的纳米碳酸钙具有较好的贮存稳定性.经表面活性剂改性的纳米碳酸钙应用于硬质PVC之后,测试其力学性能,结果显示,添加纳米碳酸钙的PVC,其力学性能优于添加普通活性轻钙的.添加量相同时,添加纳米碳酸钙的PVC的拉伸强度比添加普通活性轻钙的高10%~15%;CaCO3质量分数<30%时,断裂伸长率提高一倍以上;冲击强度最大可提高2倍以上.如以同样的力学性能为指标,则纳米碳酸钙在硬质PVC中的添加量可显著地提高.     

新型钛酸酯偶联剂的应用研究

设计及合成了一类新型的钛酸酯偶联剂AEOT,用于改性超细CaCO3,系统研究了改性CaCO3的表面性能以及改性CaCO3/PVC复合体系的综合力学性能,并用扫描电子显微镜(SEM)对CaCO3/PVC复合材料的微观结构进行了分析,发现以分子量大的AEOT-15为改性剂对CaCO3进行表面活化处理,可显著改善CaCO3/PVC复合材料的综合力学性能.     

改性膨润土对水中敌百虫和敌敌畏的吸附性能研究

研究了用季铵盐阳离子表面活性剂四甲基氯化铵（TMAC）、四乙基氯化铵（TEAC）和十六烷基三甲基溴化铵（CTMAB）改性的膨润土对有机磷农药敌百虫和敌敌畏的吸附性能。结果表明，用阳离子表面活性剂改性的膨润土的层间距和有机碳含量与改性时所用表面活性剂种类有关；改性膨润土对水中敌百虫和敌敌畏的吸附能力优于原土，并且吸附量随阳离子表面活性剂碳链的增长而增大；同一长链阳离子表面活性剂改性的膨润土对敌敌畏的吸附能力大于敌百虫；温度升高不利于敌百虫和敌敌畏在改性膨润土上的吸附。     

碳氟表面活性剂改性活性炭对罗丹明染料的吸附性能

以十六烷基三甲基溴化铵、十二烷基硫酸钠、曲拉通、阴离子碳氟表面活性剂FS-62和非离子碳氟表面活性剂FS-3100为改性剂对颗粒活性炭进行改性,并将改性活性炭用于模拟废水中罗丹明B染料的吸附脱色性能研究。考察了活性炭吸附过程中改性剂种类、改性活性炭用量、吸附时间、体系温度等因素对活性炭吸附性能的影响。正交实验结果表明,碳氟表面活性剂FS-62改性活性炭用量为0.3 g/L、吸附时间为40 min、体系温度为70℃条件下,改性活性炭对罗丹明染料的脱色率较高。利用扫描电子显微镜分析了活性炭改性前后的形貌特征,并初步探究了FS-62改性活性炭对罗丹明染料的脱色吸附反应动力学特性。     

碱式碳酸镁的形貌对软质聚氯乙烯力学性能的影响

为了研究碱式碳酸镁(BMC)的形貌对软质聚氯乙烯(PVC)力学性能的影响,文中以六水氯化镁(MgCl_2·6H_2O)为前驱体分别合成了片状(s-BMC)和花球状(g-BMC)两种不同形貌的BMC,采用自制的聚醚型钛酸酯偶联剂(eTi_(4000))对它们进行了表面改性。并将改性前后的BMC分别加入软质PVC中,通过熔融共混法制备了一系列BMC/PVC复合材料,分析了BMC的形貌和表面改性对BMC/PVC复合材料力学性能影响。结果表明:eTi_(4000)改性可以提高sBMC和g-BMC的疏水性,且能进一步提高复合材料的力学性能。无论改性与否,s-BMC的增强效果均优于g-BMC;当BMC添加量为50份时,eTi_(4000)-s-BMC/PVC复合材料的杨氏模量和屈服强度分别达83. 5 MPa和14. 9 MPa,较基体PVC提高了509. 5%和238. 6%,力学性能得到较大幅度提升。s-BMC和eTi4000-s-BMC对软质PVC的增强效果具有重要实用价值。     

硫酸钙晶须的表面改性研究

采用硼酸酯表面活性剂SBW-181对硫酸钙晶须进行了单因素条件改性试验,分别考察了改性剂用量、改性温度、改性时间和搅拌速率等工艺因素对硫酸钙晶须表面改性的影响.试验结果表明:硼酸酯表面活性剂SBW-181对硫酸钙晶须的改性效果较好,在最佳工艺条件下,改性产品的活化指数为0.996,接触角为103.4°.建立了硼酸酯表面活性剂SBW-181与硫酸钙晶须的作用模型.得出的结论对硫酸钙晶须表面改性的工业化生产具有重要的指导意义,并为硫酸钙晶须的应用研究奠定了理论基础.     

用改性粉煤灰处理表面活性剂废水的研究

研究了处理表面活性剂废水最佳改性剂、改性条件及处理的效果.通过实验方法确定HC l∶H2SO4（2∶1）的混酸为改性剂处理表面活性剂废水效果最佳;最佳改性条件为：改性剂与粉煤灰的用量为20 mL∶10 g,室温下搅拌60 m in;改性粉煤灰处理表面活性剂废水的最佳条件为：灰水比为10∶200（g∶mL）、pH值为7、室温条件下搅拌时间为40 m in;处理表面活性剂废水的去除率为：阴离子表面活性剂、阳离子表面活性剂、非离子表面活性剂的分别达到了95.50%、87.74%、94.20%.     

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

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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