导数紫外吸收光谱法测定复方新诺明片剂含量

本文探讨了导数紫外吸收光谱法测定复方新诺明片剂中磺胺甲基异恶唑(SMZ)和甲氧苄氨嘧啶(TMP)含量的最佳条件。在0.1N氢氧化钠溶液中,用二阶导数光谱(△λ=2nm)在243.5nm处测定TMP;三阶导数光谱(△λ=4nm)在244.8nm处测定SMZ、各组分互不干扰,测定回收率为99.8～101.8％、变异系数0.19～0.84％。本法不需分离即可同时测定,方法简便,精确度较高。     

导数紫外吸收光谱法测定增效联磺制剂中三组分含量

本文探讨了导数紫外吸收光谱法测定增效联磺制剂中磺胺噻唑(SD),磺胺甲基异哑唑(SXZ)和甲氧苄氨嘧啶(TMP)三组分含量的最佳条件。在0.1N氢氧化钠溶液中,用二阶导数光谱(△λ=2nm)在265.75nm处可测定SD;在243.5nm处测定SD和TMP合量,以求出TMP含量,三阶导数光谱(△λ=4nm)在244.8nm处测定SD和SMZ合量,以求出SMZ含量。测定回收率在98.2～99.6％之间,变异系数为0.26～0.96％之间。本法不需分离即可对复方制剂中的三组分含量进行同时测定,方法简便快速、精确度较高。     

分光光度法测定蒙药材接骨木中盐酸小檗碱的含量

采用回流和超声波两种方法对蒙药材接骨木中盐酸小檗碱进行提取,并用分光光度法测定盐酸小檗碱的含量,检测波长426 nm.回归方程为：Y=0.00393＋1.28929X（mg/10 ml）r=0.99992;盐酸小檗碱浓度在0.099-0.796 mg/10 ml范围内与吸光度呈线性关系,平均回收率分别为：回流法96.19%;超声波法102.69%.实验结果表明,超声波提取法较回流提取法提取率高.分光光度法简便快速,适用于接骨木中盐酸小檗碱的含量测定.     

紫外分光光度法测定盐酸托莫西汀胶囊的含量

用紫外分光光度法测定了胶囊中盐酸托莫西汀的含量,检测波长270nm.盐酸托莫西汀在0.0400g/L～0.2000g/L的范围内,其紫外吸收值与浓度呈线性关系,回归方程为y=0.1901x-0.0027,R=0.9999平均回收率为100.03%,RSD为0.66%(n=9).方法操作简便快速,准确度高,测定结果与HPLC法相符.     

紫外分光光度法测定贵州马兰总蒽醌含量

目的:测定贵州马兰中总蒽醌的含量。方法:将1,8-二羟基蒽醌对照品溶液和马兰样品溶液于200～400 nm波长范围内进行扫描,确定检测波长为223 nm,建立紫外分光光度计测定贵州马兰中总蒽醌含量。结果:1,8-二羟基蒽醌对照品溶液浓度在2.2～6.05μg/m L的范围内,其浓度与吸光度呈良好的线性关系,C=169.43A-0.1899(r=0.9996);样品加样回收率为98.31%,RSD为2.82%(n=6);贵州马兰中总蒽醌含量为3.146mg/g,RSD为1.60%(n=5)。结论:建立的紫外分光光度法操作简便,重复性良好,可用于马兰中总蒽醌的含量测定;该法可为马兰质量控制和制定质量标准提供参考。     

比色法研究铝在盐酸溶液中的腐蚀速度

用比色法研究了25℃—50℃温度范围内纯铝(含量为99.5％)在0.5—3.0N盐酸溶液中的腐蚀速度,推导出在0.5—1.5N盐酸浓度范围内腐蚀铝的动力学方程,同时计算出各种动力学参数,据实验结果讨论了腐蚀反应机理。     

分光光度法对偏最小二乘法和主成分分析计算结果影响的研究

以两组分混合物模型体系为例初步研究了多组分体系光谱重叠程度、校正集样品数、测量波长数、组分浓度之比及随机误差等因素对偏最小二乘法和主成分分析计算结果的影响,还以食用色素二组分体系的光谱数据为例说明如何利用混合物模型体系来选择其测量参数并预报测定误差     

荧光法测定消毒剂中盐酸聚六亚甲基胍

建立了荧光法测定消毒剂中盐酸聚六亚甲基胍（PHMG-HCl）的方法．PHMG-HCl在碱性条件下与茚三酮反应生成荧光产物,测定其荧光光谱,最大激发波长为405nm,最大发射波长为500nm.在有两性表面活性剂存在时,体系的荧光强度大大加强,并与PHMG-HCl的质量浓度在2.010-4～2.510-1g/L范围内呈线性关系.相关系数为0.9993;检出限为 4.010-5g/L．用该方法测定了消毒剂中PHMG-HCl的含量,获得满意结果．该方法操作简便,具有较高的灵敏度和准确度．     

盐酸川芎嗪的光谱性质研究

研究了盐酸川芎嗪的吸收光谱和荧光光谱.在pH<5时,盐酸川芎嗪水溶液的荧光强度随pH的升高而增大;在pH 5～12范围内,荧光强度达到最大且基本稳定,在377 nm处形成一等荧光点.从盐酸川芎嗪的紫外吸收光谱看,随pH的升高吸光度逐渐降低且最大吸收波长发生蓝移,从301 nm蓝移至294 nm,在287 nm处形成一等色点,表明盐酸川芎嗪随pH的变化发生了型体的转化,即发生了质子离解,用紫外分光光度法和荧光法测得其解离常数分别为pKa=3.71和pKa=3.70,两种方法测定的结果基本一致.     

pH渐变光谱秩消失因子分析法测定混合物中的2,4-二硝基苯酚

建立了pH渐变光谱秩消失因子分析法测定混合物中2,4-二硝基苯酚的新方法.在本方法中,以向Britton-Robinson缓冲溶液中滴加氢氧化钠溶液的方式使溶液pH不断变化,通过记录多个pH点溶液的吸收光谱获得酸度-光谱双线性数据矩阵,再应用秩消失因子分析法计算混合物中2,4-二硝基苯酚的浓度.应用本方法对混合物样品中2,4-二硝基苯酚的进行了测定,结果满意.     

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