酚醛树脂在异型石材磨具中的应用

利用酚醛树脂作为主粘结剂,丁腈橡胶作为软化剂,制备异型石材磨具,研究和酚醛树脂,丁腈橡胶,气孔填充剂,以及工艺条件对磨具的影响,酚醛树脂,丁腈橡胶,气孔填充剂三者的配比,对提高磨具的磨削比和抛光光泽度极其重要其各种成分和最佳质量分数分别为酚醛树脂０．２５,丁腈橡胶０．２５－０．３５,气孔填充剂０．１０－０．２０。     

正交实验法优选蒜头果油的动态提取工艺条件

采用动态提取法,应用L9(34)正交实验设计优选蒜头果油的最佳提取工艺条件.结果表明,最佳提取工艺条件为以石油醚为提取剂,提取时间为7 h,原料用粉碎机粉碎,提取用的水浴温度为90℃.优选提取工艺稳定可行.     

硅钨酸为催化剂合成硬脂酸乙二醇酯

以硅钨酸为催化剂，苯为带水剂．以乙二醇和硬脂酸为原料合成了硬脂酸乙二醇酯珠光剂。研究了其最佳工艺条件并与对甲苯磺酸作了对比，研究表明其最佳工艺条件为：n(硬脂酸)：n(乙二醇)=2．1：1，反应温度为-140℃，W(催化剂)＝4％。     

鸡爪皮制装饰革工艺的研究

本文根据鸡爪皮纤维编织平顺，紧密角质层厚、皮下油脂过多等特点，经过反复多次工艺摸索，确定以多次分阶段脱脂，缓和深透复灰、适度软化、铬盐鞣制、栲胶复鞣填充、鞣后整理等工艺方案，制得成革手感丰满，天然粒纹清晰。     

猪皮起皱技术的研究（一）

本文主要对猪皮各种起皱过程的技术条件进行研究，通过对起皱剂种类的选择，如丙烯酸树脂、ＨＳ复鞣剂、栲胶以及对温度、ｐＨ值、起皱剂用量的控制，选择了适于起皱的较为理想的条件。     

高分子复合调剖剂的制备及性能

利用水溶液聚合的方法制备高分子复合调剖剂(FRC)。研究聚合条件、材料结构对性能的影响，并优化聚合工艺条件，确定合成工艺。结果证明，高分子复合调剖剂(FRC)的综合性能显著优于均聚物调剖材料，具有显著的调剖应用效果。     

丙烯酸酯改性大豆蛋白制备胶黏剂

为有效提高胶黏剂的胶合强度,用丙烯酸酯接枝大豆蛋白进行乳液聚合反应,得到丙烯酸酯改性大豆蛋白胶黏剂;采用FT-IR表征产物,考察丙烯酸酯接枝大豆蛋白胶黏剂的固含量、黏度;通过正交试验确定胶黏剂制备、胶合板样板压制的最佳工艺条件.结果表明:改性大豆蛋白胶黏剂固含量为24.0%～27.3%,耐水性明显高于普通大豆蛋白胶;改性胶黏剂最佳制备工艺条件为p H在8.0～8.5,m(大豆蛋白)∶m(水)∶m(马来酸酐)∶m(引发剂)为80∶150∶3∶10,在该配比下胶合强度最好,胶合板的耐水性提高,胶合强度在0.70 MPa以上,均符合国家标准GB/T 9846—2004Ⅱ类胶合板要求;压制胶合板样板的最佳工艺条件为温度120℃、压强1 MPa、压板时间10 min,胶合板性能最佳,胶合强度达到1.12 MPa.     

杀螟晶主要成分的气相色谱分析

采用SQ-206型气相色谱仪,对马拉硫磷与三唑磷混剂(杀螟晶)在10%SE-30不锈钢填充柱(2 m×2 mm/6 201红色担体)上的分析进行分析,确定了最佳色谱分析条件,建立了定性定量方法.     

液膜萃取法处理炼油厂含酚废水

对液膜萃取法处理炼油厂含酚废水进行了研究,考察了乳化剂浓度、水相NaOH浓度、油水比、乳水比、废水PH值、搅拌强度、萃取时间等时间等因素对除酚效率的影响,确定了最佳的萃取剂配方和最佳的工艺条件。用液膜萃取法处理炼油厂含酚废水,萃取时间快,除酚效率高(按近90%),能有效地消除含酚废水的污染。     

MAC型离子交换剂的制备及其处理含Zn~(2+)废水的研究

本文利用密县风化煤为原料，制成ＭＡＣ型离子交换剂，对含Ｚｎ２＋废水的处理进行研究，找出了ＭＡＣ型离子交换剂处理含Ｚｎ２＋废水的最佳条件     

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