乙异羟肟酸辐解产生的氢气和一氧化碳的定性定量分析

该文用0.5 nm分子筛填充柱与热导型检测器（TCD）联用的气相色谱法定性定量分析了乙 异羟肟酸水溶液辐解产生的氢气和一氧化碳.结果表明：当乙异羟肟酸浓度为0.1～0.5 mol/L、剂量为10～1 000 kGy时,氢气体积分数与乙异羟肟酸浓度的关系不大.当 剂 量低于500 kGy时,氢气体积分数随剂量增大而增大,但当剂量大于500 kGy时,氢气体积分 数与剂量的关系不明显.一氧化碳只有在较高剂量时才产生,且体积分数很低.     

焦炉煤气组分气相色谱分析法分析条件

通过正交实验设计,结合其他参数的测定,得出气相色谱法分析焦炉煤气详细的实验数据,对分析条件的影响作了讨论.实验结果表明,柱箱温度是影响分析的主要条件,载气的流速、检测器温度和检测器桥电流的影响并不显著.经实验确定的最佳分析条件:载气流速为56 mL/min;柱箱温度为室温;检测器桥电流为120 mA:检测器温度为100℃.     

焦炉煤气组分气相色谱分析法分析条件

通过正交实验设计,结合其他参数的测定,得出气相色谱法分析焦炉煤气详细的实验数据,对分析条件的影响作了讨论。实验结果表明,柱箱温度是影响分析的主要条件,载气的流速、检测器温度和检测器桥电流的影响并不显著。经实验确定的最佳分析条件:载气流速为56 mL/min;柱箱温度为室温;检测器桥电流为120 mA;检测器温度为100℃。     

焦炉煤气组分气相色谱法分析实验研究

为了找到焦炉煤气组分气相色谱法分析最优的分析条件,使用自装柱,通过正交实验设计,研究了分析条件对分析结果的影响。结果表明:最优分析条件为:载气流速:43ML/min;柱箱温度:室温;检测器桥电流:120mA;检测器温度:100℃。通过分析可得出如下结论:柱箱温度是影响分析的主要条件,而载气的流速、检测器温度和检测器桥电流的影响并不显著。     

反相气相色谱法测定聚乙烯醇的玻璃化温度

用改装后的100型气相层析仪,以氢气为载气,热导池为检测器,用反相气相色谱法测定聚乙烯醇(PVA)的玻璃化温度.选用甲醇、正丙醇、乙腈、四氯化碳作探针分子.测得PVA的玻璃化温度分别为85.6℃,85.6℃、85.6℃、83.6℃,与文献值相符.载气氢气的流速在78.4-96.0毫升/分之间变化,惰性气体氮气的进样量在0.2微升-1.0微升之间变化对实验结果无影响.柱中PVA的量在0.5241克-0.8487克之间变化以及无论用Chromosorb w AW-DMCS,60-80目或Chromosorb W-HP,100-120目作担体,在本实验条件下对PVA玻璃化温度的测定也无明显的影响.     

CO_2吸附强化模拟生物油重整制氢的实验研究

选用Ce-Ni/Co作催化剂、由醋酸钙煅烧制得的Ca O作重整催化剂、CO2吸附剂,进行模拟生物油吸附强化蒸汽重整制氢的研究.实验结果表明:在相同温度、M(S)/M(C)(加入水蒸气的摩尔质量与生物油模化物中碳的摩尔质量之比)条件下,吸附剂的加入有利于提高氢气摩尔分数和氢气产率;添加吸附剂后,随着温度的升高,氢气摩尔分数、氢气产率均呈现先增大后减小的趋势,在700℃时达到最大;随着M(S)/M(C)的增加,氢气摩尔分数先增大后减小,在M(S)/M(C)=9时氢气摩尔分数达到最大,而氢气产率则在M(S)/M(C)超过9后变化不大;随着M(Ca O)/M(C)(加入的氧化钙的摩尔质量与生物油模化物中碳的摩尔质量之比)的增加,氢气摩尔分数逐渐增大,达到M(Ca O)/M(C)=3后几乎不变,氢气产率则先增大后减小,在M(Ca O)/M(C)=3时达到最大;温度=700℃,M(S)/M(C)=9,M(Ca O)/M(C)=3为模拟生物油重整制氢的最佳条件,在此条件下氢气摩尔分数、氢气产率分别达到92.2%,84.1%.     

高效液相色谱法-蒸发光散射检测器测定盾叶薯蓣中薯蓣皂苷的含量

建立以蒸发光散射检测器(ELSD)测定盾叶薯蓣中薯蓣皂苷含量的高效液相色谱分析方法,考察了不同产地盾叶薯蓣中薯蓣皂苷的含量.色谱柱为HiQsil C18柱(250 mm×4.6 mm,10μm),流动相为乙腈-水(33∶67),流速为0.8 mL/min,柱温为室温.Alltech蒸发光散射检测器参数:载气为氮气,流速为2.5mL/min,漂移管温度为100℃,压力为0.45 Mpa.结果表明:薯蓣皂苷在0.35~3.48μg范围内有良好线性关系,r=0.9976,平均回收率为103.2%,RSD为1.61%(n=6).该方法快速简便,灵敏度高,结果准确可靠,可用于盾叶薯蓣药材中薯蓣皂苷的分析及质量检测与控制.     

农业生物质在超临界水中气化制氢的实验研究

以农业生物质(包括玉米秸秆、玉米芯、麦秸、稻草、稻壳、花生壳、高粱秆)为原料，羧甲基纤维素钠为添加剂，利用连续管流反应器，在反应器壁温为650℃、压力为25MPa的条件下进行了生物质气化制氢实验研究．讨论了运行时间、生物质类型、颗粒大小、反应器壁面状况等因素对气化结果的影响．实验结果表明：农业生物质在超临界水中气化生成以氢气、二氧化碳、一氧化碳、甲烷以及少量的乙烷和乙烯为主要成分的气体；气化周期内大约经过100min气体产物组成以及产量趋于稳定；在相同的实验条件下不同生物质气化得到了相似的气体组分，气体产物中一氧化碳体积分数大约为1％，甲烷体积分数超过10％，氢气的体积分数最高可以达41．28％；小颗粒的生物质气化能生成更多的氢气；反应器壁面对生物质气化有明显的催化作用．     

有机液态氢化物电催化加氢产物的分析方法

为建立一种对有机液态氢化物电催化加氢产物进行分析的方法 ,对一系列玻璃管填充柱和毛细管柱进行了筛选 ,考察了柱温、载气流速、进样器温度、检测室温度等条件对色谱柱分离效果的影响 ,建立了苯系电催化加氢产物气相色谱分离方法。其优选条件如下 :色谱柱为 5 0m长的毛细管柱 ,其内径为 0 .2 5mm ,固定液为SP2 10 0 ;柱温为 5 0℃ ,进样器温度为 15 0℃ ,检测室温度为 180℃ ,柱前压为 0 .2MPa(载气流速为 2 5 .1mL/min)。该分析方法具有分析时间短、易控制等特点。     

气相色谱法测定正辛醇氧化产物

本文着重讨论气相色谱法测定正辛醇氧化油相产物。实验结果表明,使用102担体涂5%聚乙二醇—12000固定液的色谱柱,SP—2305型气相色谱仪,双柱双气路四臂铼钨丝热导池检测器,氢气做载气,在柱温150℃左右,检测室温度200℃,汽化室温度220℃,载气流速65—75ml/min,桥流150mA,柱前压力1.3公斤/厘米~2的操作条件下,对正辛醇氧化产物(油相)进行分析,采用已知物对照法和保留指数法定性,内标法定量,结果令人满意。     

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