鸡蛋膜负载的银颗粒对盐酸四环素的降解研究

利用鸡蛋膜和银氨溶液制备鸡蛋膜负载的银颗粒(Ag/ESM),并对Ag/ESM的制备条件进行了优化.根据生物模板易于操作的优点和银颗粒催化分解过氧化氢产生活性氧的能力,将Ag/ESM用于降解盐酸四环素,并对其降解盐酸四环素的条件和效果进行了研究.结果表明,利用鸡蛋膜和银氨溶液可成功制备出Ag/ESM,且制备流程简单.Ag/ESM的最佳制备条件为:银氨溶液浓度13.5 mmol·L-1、反应温度50℃、反应时间3 h.当Ag/ESM用量为20片,过氧化氢浓度为0.1 mmol·L-1,盐酸四环素的初始质量浓度为50 mg·L-1时,盐酸四环素的降解率最高,为81.92％,说明以Ag/ESM为活性材料,在过氧化氢的辅助下可实现对盐酸四环素的高效降解.此外,Ag/ESM可被简便地从处置液中分离出来,使降解过程更为简便.简单的制备方法和便捷的分离操作使得鸡蛋膜负载的银颗粒成为一种较理想的降解盐酸四环素的活性材料.     

X80管线钢钝化膜电化学性能的EIS研究

目的 研究成膜电位、温度和氯离子等对X80管线钢在1 mol/L NaHCO3/0.5 mol/L Na2CO3缓冲溶液中所形成的钝化膜的电化学性能的影响.方法 利用电化学阻抗谱技术研究了X80管线钢在1 mol/L NaHCO3/0.5 mol/L Na2CO3缓冲溶液中所形成的钝化膜的电化学性能.结果 随着成膜电位的增加,传递电阻R1减小,而膜电阻R2和扩散阻抗YW增加,表明膜的致密性增加;成膜温度升高,传递电阻R1、膜电容Q2和膜电阻.尺2减小,说明膜的致密性减小;同一温度下增加溶液中的氯离子浓度,传递电阻R1、膜电容Q2和膜电阻R2:均减小;在同一氯离子浓度下升高温度,传递电阻R1、膜电容Q2:和膜电阻R2:均减小.结论 成膜电位、成膜温度和氯离子会对钝化膜的电化学性能产生显著的影响.     

温度、氯离子和铬元素对J55油套管钢钝化膜半导体性能的影响

利用电容测量法及电化学阻抗谱技术研究了温度、氯离子浓度和铬元素对目前广泛使用的J55油套管钢在模拟土壤环境中所成钝化膜半导体性能的影响.结果表明:钝化膜呈现n型半导体特性,随着成膜温度的升高、铬元素的加入和氯离子浓度的增加,Mott-Schottky曲线直线部分的斜率减小,表明膜内杂质密度增加.阻抗谱结果表明:在同一温度下,离子在膜内的传递电阻R1随着氯离子浓度增加而减小,膜内的扩散系数YW增加;同一氯离子浓度下,随着成膜温度的升高,扩散系数YW减小.表明温度升高、溶液中氯离子浓度的增加以及铬元素的加入会使钝化膜对J55油套管钢基体的保护作用减弱.     

膜生物反应器用于居民区生活污水处理与回用

采用缺氧/厌氧-生物膜技术,结合活性炭过滤、紫外线氯消毒的组合工艺深度处理居民区生活污水,分别以冲洗厕所和景观用水为目标,考察再生水的水质状况和主要参数;对比研究以混合生活污水和灰水分别作为中水源的技术和经济适用性.中试研究结果表明,以居住区生活污水(化粪池出水)作为中水源,运行条件停留时间8h、污泥质量浓度3500～7500 mg·L-1、出水无色无味,化学需氧量质量浓度低于30 mg·L-1,五日生化需氧量质量浓度低于3 mg·L-1,氨氮质量浓度低于3.0mg· L-1,可以稳定达到杂用水标准,但总氮、总磷浓度无法满足景观用水要求;模拟原污水(化粪池进水)的污染物浓度比例,运行条件为停留时间10h、污泥龄50 d、回流比为200％、污泥质量浓度5500～6000mg·L-1、外加聚合铝(有效铝)4～5 mg·L-1时,再生水的水质均优于冲厕和景观用水标准.在达到相同的再生水水质条件下,居住区的生活污水混合收集处理比灰水单独收集处理的工艺流程复杂,处理费用比后者高0.32元·m-3.居民区污水资源化采用何种收集和再生方式不仅要考虑技术经济合理性,还需结合居民区再生水的用途和用水量、当地气候条件等因素综合确定.     

过氧化氢对不同光质下盐藻SZ-05生长及代谢产物积累的影响

研究不同浓度的过氧化氢对在不同光质(白、红、黄、蓝光)下生长的杜氏盐藻SZ-05(Dunaliella salina SZ-05)生长与代谢产物积累的影响.结果表明,当过氧化氢浓度从10-6 mol·L-1增至10-4 mol·L-1时,对盐藻的生长有微弱的促进作用,各种光质培养条件下盐藻的细胞密度均逐渐增大至最大值,其中红光下的盐藻细胞密度最大,为6.19×106 ml-1;当过氧化氢的浓度增加到10-3 mol·L-1时,细胞密度减小,表现为抑制作用.在过氧化氢浓度为10-6 mol·L-1时,不同光质培养条件下盐藻的单个细胞内β胡萝卜素的含量均达到最大值,其中红光单个细胞内的β胡萝卜素的含量最大,为0.790 pg.当过氧化氢浓度继续增加时,单个细胞内β胡萝卜素的含量降低,表现为抑制作用.在过氧化氢浓度为10-3 mol·L-1时,红光条件下生长的盐藻胞外多糖含量获得最大值,为5.97 pg.     

商陆根表铁锰氧化胶膜形成的影响因素研究

以锰超积累植物商陆(Phytolacca acinosa Roxb.)为研究对象,采用水培的方法,通过原子吸收光谱仪测定商陆根表铁锰氧化胶膜的含量,探讨Fe2+、Mn2+质量浓度,铁锰氧化菌MN1405接种量,pH等条件对商陆根表铁锰氧化胶膜形成的影响.结果表明,在不同的培养条件下,商陆根表铁锰氧化膜的含量不同.当pH为6,铁锰氧化菌MN1405接种量为10%,培养液的初始Fe2+质量浓度为30mg·L-1,Mn2+质量浓度为700mg·L-1时,最有利于商陆根表铁锰氧化胶膜形成,铁锰氧化胶膜的含量分别达到(835.5±30.0)g·kg-1和(7 752.7±126.7)g·kg-1.     

蜂窝状微生物膜降解氨氮

实验利用新型悬浮载体对氨氮降解进行了研究.在悬浮载体上形成了蜂窝状的微生物薄膜结构,增加了微生物附着的比表面积,薄膜的形成有利于氧气的扩散和基质的转移,为硝化菌提供了有利的生存环境.实验在pH值为7.8～8.2,温度为24～29℃的条件下,当进水的氨氮质量浓度为40～78mg·L-1时,经过3h的反应周期后,氨氮质量浓度下降到2mg·L-1以下,COD从300mg·L-1降低到50mg·L-1以下;在反应周期为4h时,氨氮质量浓度从80～130mg·L-1下降到3.5mg·L-1以下,COD从350mg·L-1降低到46mg·L-1以下.结果表明,该悬浮载体上形成的生物膜结构有利于氨氮降解,反应器内实现了较好的COD和氨氮去除.     

多孔氧化铝模板的快速制备

提出一种快速制备多孔氧化铝(anodic aluminum oxide,AAO)模板的新方法.以0.3 mol·L-1草酸溶液为电解液,利用两阶段升压法,在0 C和120 V条件下制备AAO模板.该方法的成膜速率达到1.1 μm·min-1,比传统低电压(50 V)制备条件下的成膜速率提高近20倍.通过控制AAO模板在0.8 mol·L-1磷酸溶液中的腐蚀时间,可使模板孔径在40～120 nm范围调节.     

三十烷基磷酸酯钾(TPK)对苜蓿幼苗抗旱生理效应的影响

应用不同浓度的TPK(三十烷基磷酸酯钾)溶液在水分胁迫条件下处理苜蓿(Medlicago Sativa L.)幼苗,目的是探讨TPK对苜蓿幼苗的抗旱性生理效应的影响.结果表明,与对照组相比较,三种不同浓度(0.1mg·L-1、0.01mg·L-1、0.001mg·L-1)的TPK对植株的生理指标及形态特征有明显的调节作用,均能不同程度地提高苜蓿的抗旱性.主要表现在脯氨酸含量、SOD活性、POD活性等生理指标以及株高、鲜重等形态指标的提高.其中以0.01mg·L-1的TPK溶液浓度的效果最佳.     

电沉积聚苯胺纳米线及其电化学性质

采用恒电流法在不同浓度的苯胺与1mol·L-1高氯酸的混合溶液中,在氧化铟锡(ITO)导电玻璃基底上制备了聚苯胺纳米线.系统研究了苯胺浓度、合成时间对其形貌及电化学性能的影响.SEM结果显示,在不同条件下制得的聚苯胺为线状,直径大约在100～500nm.采用恒电流充放电、循环伏安和交流阻抗谱对聚苯胺纳米线电极的电化学性能进行了表征.结果表明,其在3mol·L-1NH4Cl和2mol·L-1ZnCl2的混合溶液中恒电流充放电(电压范围-0.2～0.5V)的比容量最高可达746.7F.g-1.     

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.     

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     

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

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