金纳米粒子对降解对硝基苯胺的催化作用研究

对金纳米粒子对硼氢化钠还原降解对硝基苯胺的催化作用进行了研究,建立了催化还原降解硝基苯类污染物的新方法。实验考察了金纳米粒子量、硼氢化钠浓度以及体系pH等因素对降解速率的影响。实验结果表明,在0.6 mL 3.0 nmol/L纳米金,3.0 mg/mL硼氢化钠和BR缓冲溶液(pH=5)的条件下共同作用,0.6 mL 1.0 mg/m L对硝基苯胺的降解率在10 min内可达92.2%。     

重组葡激酶(r-Sak)工程菌发酵工艺的研究

通过对影响重组葡激酶表达的几个主要因素的研究，建立了较为适宜的发酵条件：接种量4%；初始pH7.2；在A600nm=2.5时加20%蔗糖诱导，诱导后4～5h收获，发酵液上清r-Sak含量可达到250mg/L以上，酶活力可达到6500RU/ml以上。     

RuCl3/TPPTS催化CO选择还原间氯硝基苯反应

将水溶性膦／钌配合物用于以CO为还原剂的水／有机两相间氯硝基苯选择还原为间氯苯胺的反应．考察了十六烷基三甲基溴化铵(CTAB)与氢氧化钠(NaOH)浓度、反应温度、CO压力以及膦／钌比例等因素对反应结果的影响．研究结果表明，当反应条件为135℃、CO压力3MPa、NaOH浓度2mol／L时，反应8h，问氯硝基苯的转化率为97％，间氨苯胺的选择性可达到99％以上．通过简单的相分离操作就能将水相中的催化剂循环使用，循环使用3次后，间氯硝基苯的转化率和间氨苯胺的收率仍可达到89％以上．     

废水中硝基苯的分光光度法测定研究

本文提出了分光光度法测定硝基苯的新方法在碱性介质中，二氧化硫脲可将硝基苯还原为苯胺，经重氮化后，与萘乙二胺偶联．生成紫红色偶氮染料，其最大吸收波长为552nm，检测限为4μg·L^-1,硝基苯含量在0～1mg／L范围内符合朗伯-比尔定律，其摩尔吸光系数为3.09×10^4L,mol^-1·cm^-1,操作简便，结果满意。     

微生物异化还原及其对硝基苯的耦合降解

通过静态实验对地下环境中微生物异化还原降解硝基苯作用及其影响因素进行了研究。结果表明,铁还原微生物能以简单有机物为碳源生长并还原针铁矿,硝基苯可以作为唯一碳源被铁还原微生物利用,随着硝基苯浓度的升高,铁还原微生物的生长逐渐受到抑制,硝基苯浓度为600mg/L时,铁还原微生物的生长停滞。针铁矿浓度0.3mg/L、铁还原微生物浓度2?08cells/mL时耦合体系对硝基苯降解效果最好,硝基苯降解率达78.5%以上。腐植酸能作为电子穿梭体促进耦合体系中硝基苯的衰减,硝基苯降解率达88.8%以上,而维生素B2（VB2）抑制了硝基苯的降解。     

内电解-芬顿氧化-絮凝组合工艺处理硝基苯废水

硝基苯作为一种典型硝基芳香族化合物（NACs）,其对人类健康和生态环境具有极大的危害,因此探究硝基苯的高效降解方法具有重要意义。采用内电解-芬顿氧化-絮凝组合工艺处理硝基苯废水,探究镀铜率、反应时间、曝气量、pH及n(H2O2)/n(Fe2+)等参数对该组合工艺处理废水效果的影响,完成相关工艺参数条件优化,并揭示相关耦合机理。实验结果表明：在镀铜率为0.5%、曝气量为0.5 L/h、反应时间为6 h的条件下,初始质量浓度为50 mg/L的硝基苯可被铁铜内电解转化成苯胺,转化率为99.8% (±0.2%);芬顿氧化反应在n(H2O2)∶n(Fe2+)=10∶1、pH=3.0、ρ(Fe2+) = 60 mg/L的条件下,苯胺的去除率达到99.8% (± 0.3%);絮凝沉淀反应中阴离子PAM的絮凝效果更好,当加入2 mL质量浓度为10 mg/L的阴离子PAM时,废水的色度为20倍,达到了国家规定的一级排放标准。综上所述,该组合工艺在处理含硝基苯废水中具有较好的可行性,可为实现大规模化处理含高浓度NACs废水奠定基础。     

2,5—二氨基苯磺酸的合成与研究

采用对苯二胺或２－氨基－５－硝基苯磺酸为原料合成了２，５－二氨基苯磺酸，后者收率可达到９５％，高于前者收率（小于６０％）。对铁屑还原反应的研究表明，铁屑粒度的降低以及采用本文制备的催化剂Ｂ，反应速率明显提高。     

2,5-二氨基苯磺酸的合成与研究

采用对苯二胺或２－氨基－５－硝基苯磺酸为原料合成了２，５－二氨基苯磺酸，后者收率可达到９５％，高于前者收率（小于６０％）．对铁屑还原反应的研究表明，铁屑粒度的降低以及采用本文制备的催化剂Ｂ，反应速率明显提高．     

Pd/C中Pd粒径调控及对多氯硝基苯的催化还原影响

为控制多氯硝基苯加氢制备多氯苯胺的深度脱氯,在Pd/C催化剂制备中,考察了硝酸浓度、催化剂还原温度和时间对催化剂上Pd粒径及催化加氢活性和选择性的影响。结果表明:Pd粒径的增大导致催化剂对多氯硝基苯的催化活性下降,但多氯苯胺的选择性上升;随着硝酸浓度的增加,Pd的分散性和粒径先增大后减少,而还原温度和时间的增加可增大Pd的粒径;采用15%硝酸处理、200~250℃下氢气还原4~5 h可获得较理想的Pd粒径为16~20 nm的Pd/C催化剂;对五氯硝基苯加氢还原呈现较高的加氢活性和选择性,转化率可达99%以上,五氯苯胺选择性可达96%以上。     

快速测定废水中苯胺、硝基苯方法研究

选用分析纯正己烷,对兰州石化公司化肥厂苯胺装置苯胺废水塔(T-601)馏出口废水、硝基苯废水塔(T-401)馏出口废水、污水池废水、污水处理废水中的苯胺、硝基苯进行萃取,采用大口径毛细管柱气相色谱分离技术,对萃取液中苯胺、硝基苯进行分离,用FID检测器进行检测,用标样中苯胺、硝基苯的保留时间与样品中色谱峰保留时间相对照的方法定性,峰面积标准曲线法定量,进行废水中苯胺、硝基苯气相色谱法快速测定的方法研究,方法最低检测下限为:苯胺0.91mg/L、硝基苯0.98mg/L,分析时间为15min,分析结果的相对标准偏差RSD4.0%。     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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