硫化钠溶液中羊毛角蛋白溶解条件优化

以羊毛为原料,以硫化钠/尿素/十二烷基硫酸钠(SDS)的混合溶剂体系为溶剂,以硫化钠用量、SDS用量、溶解温度、溶解时间以及反应的浴比为考察因素,以羊毛的溶解率、溶液的浓度和特性黏数为目标函数,采用二次通用旋转组合设计建立了羊毛溶解过程中的数学回归方程。通过对回归方程的参数优化得到了羊毛溶解时的优化参数如下:Na_2S用量1.9%、SDS用量0.8%,浴比22,溶解温度和溶解时间分别为35℃和20 h。以该参数进行羊毛溶解实验得到羊毛溶解率83.6%,溶液浓度4.28×10~(-2)kg/L,特性黏数4.35×10~3L/kg。     

聚合物溶液磁处理参数优化研究

采用系列磁化器研究了磁处理对部分水解聚丙烯酰胺溶液黏度的影响 .以聚合物浓度、磁场强度和峰数 3因素 3水平的正交试验设计方法进行了HPAM溶液磁处理参数的优化研究 .发现磁处理后HPAM溶液的黏度普遍提高 ,而且随聚合物溶液浓度、磁场强度和峰数的增加而增大 .影响HPAM溶液磁增黏效果的因素依次为聚合物浓度、磁场强度和峰数 .试验得到的磁增黏优化参数为聚合物浓度 10 0 0mg/L、磁场强度 5 0 0mT、峰数 4峰 .     

羊毛纬平针织物抗起毛起球整理与性能

选用一种低温环保型水性丙烯酸酯共聚乳液,对羊毛纬平针织物进行了抗起毛起球的整理,研究了整理剂质量浓度、浴比、时间、温度4个因子对羊毛纬平针织物整理效果的影响.根据正交实验得出较优工艺参数为:整理剂质量浓度30g/L、浴比1:35、温度50℃、时间30min.经该工艺整理后可提高羊毛纬平针织物的抗起毛起球性能和织物强力.     

秋葵纤维的化学脱胶工艺

采用化学脱胶处理秋葵纤维,对预酸和碱煮工艺中的参数进行优化设计,提取出可纺纤维,并对处理后纤维的长度、细度及断裂强度进行测试和评价.预酸处理,硫酸溶液质量浓度2 g/L,处理时间120min,处理温度60℃.浴比1:15;碱处理,一煮碱溶液质量浓度7.5 g/L.二煮碱溶液质量浓度9 g/L,一煮处理时间3.5 h.二煮处理时间2 h,处理温度100℃.浴比1:20.其中一煮与二煮中添加2%的硅酸钠、尿索和JFC.纤维性能测试结果表明:残胶率为7.32%,工艺纤维长度为10～30 cm、细度为2.8 tcx,断裂强度为23.8 cN/tcx.     

硫化汞光散射法检测环境水样中痕量汞

建立了一种利用光散射测定水中痕量汞的新方法,在碱性介质中,硫化钠(Na2S)与汞离子生成硫化汞(Hg S)颗粒,在阴离子表面活性剂十二烷基硫酸钠(SDS)的作用下,光散射强度增大.在468 nm波长处,光散射强度最大,并且散射光增强强度(△I)与汞的浓度(2.48×10-10~6.00×10-9mol/L)呈良好的线性关系,线性回归方程为△I=34.05c+14.2,相关系数r为0.9988.据此建立检测环境水样中痕量汞的新方法,该方法检出限为7.44×10-11mol/L;样品加标回收率为98.80%~103.00%.     

中心组合实验设计响应面法优化α淀粉酶抑制剂筛选条件

采用中心组合设计(CCD)响应面法(RSM)优化α淀粉酶抑制剂筛选条件.在单因素试验基础上,对影响α淀粉酶抑制剂活性的4个因素即淀粉溶液浓度、保温温度、DNS用量、沸水时间进行优化,根据回归方程最终确定α淀粉酶溶液质量浓度1mg/mL,淀粉溶液质量浓度17 mg/mL,保温温度46℃,保温时间15 min,DNS用量2mL,沸水时间6min.经试验验证结果稳定可靠,可用于α淀粉酶抑制剂筛选.     

高稳性多硫化钠蒸煮药液的制备

探讨了用溶解单质硫法制备高稳性多硫化钠蒸煮药液的技术,包括多硫化钠蒸煮药液受反应温度、反应时间、搅拌速率、硫化钠浓度和碱液浓度等因素的影响。结果表明,制备高稳性多硫化钠蒸煮药液的优化工艺条件为：反应温度80℃,时间30min,搅拌速率100r／min,以及尽可能高的硫化钠浓度;添加稳定剂A,可减缓碱液对多硫化钠的分解作用。     

相关流量测井用液体示踪剂的优选研究

以改性聚丙烯酰胺(改性PAM)为示踪剂载体,通过吸附放射性同位素碘离子制备了相关流量测井用液体示踪剂,并探讨了相对分子量、溶解时间、溶解温度和溶液浓度等配制条件对碘离子吸附率的影响.结果表明,示踪剂所用改性PAM的相对分子量为100万~300万;随着改性PAM溶液浓度的增大,碘离子吸附率提高,溶液质量浓度为70~300 mg/L较适宜;随着溶解温度的升高,碘离子吸附率先增大后降低,相对分子量高的改性PAM对碘离子吸附率较高;液体示踪剂尽量现用现配.     

马20块复合驱油效果研究

选用大庆炼化相对分子质量为1 900×104,浓度为1 500 mg/L的聚合物溶液,与SS(石油磺酸盐)无碱二元体系;与SS、碳酸钠三元体系。二元体系和三元体系均能达到超低界面张力。对单聚体、二元体和三元体进行了黏弹性、黏度及驱油试验。研究表明,三元体系在表活剂浓度为0.3%、碱浓度为1.2%时,界面张力达到3~10 mN/m,二元体系表活剂浓度为0.3%时也能达到3~10 mN/m;由于没有碱的加入,单聚的黏弹特性要高于复合体系,在复合体系中,二元体系的黏弹特性高于三元体系。人造非均质驱油实验结果得出,SS无碱二元体系的采收率达到了30.1%,比单聚高出6.7%,比三元复合体系高出2.7%。     

微晶纤维素/1-丁基-3-甲基咪唑氯体系流变性能研究

离子液体1-丁基-3-甲基咪唑氯(BmimCl)可用作溶解微晶纤维素(MCC)的优良溶剂。通过稳态剪切和动态扫描测试考察了微晶纤维素离子液体溶液的流变性能。结果表明,所有浓度的MCC/BmimCl溶液在高剪切速率和低剪切速率表现出剪切变稀行为。温度和浓度对MCC/BmimCl溶液的黏弹性质产生重要影响。将复合黏度数据用于Cross模型,并利用Arrhenius公式计算了不同浓度MCC/BmimCl溶液的流动活化能。     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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