氢离子中性载体电极用于环境含氟废水中pH值的检测

设计合成了一种用于环境含氟废水中pH值测定的氢离子中性载体材料,即（o-羟基苄基）二正十二胺（Ⅱ）,其聚氯乙烯膜电极的电位响应pH线性区间为2．0～12．5,能斯特响应斜率为56．9±0．4mV／pH（25℃）．该电极具有内阻低、响应快、电位选择性高、重现性好与稳定性高的优点,且不受氢氟酸侵蚀和不易破碎,能很好地被应用于环境含氟废水样品的pH值测量．     

应用离子选择性电极法测定废水中氨氮

研究应用氨气敏电极对工业废水中氨氮进行测定时,pH值、电极响应时间、氨逃逸时间,以及废水中干扰物对氨气敏电极的电极电位的影响.结果表明,当pH值大于11时,pH值对测定电极电位没有影响;氨浓度越高,电极响应时间越短,氨逃逸时间越迟;氨气敏电极具有很高的选择性,在强碱性条件下,采用EDTA作掩蔽剂,13种干扰物质对测定没有明显干扰.     

金属阳离子选择电极测定弱酸强碱盐水解常数方法研究

对弱酸强碱盐水解平衡体系进行讨论，导出了弱酸强碱盐水解平衡常数、金属离子浓度和溶液pH值之间的相互关系，提出了一种利用金属阳离子选择性电极测定弱酸强碱盐水解平衡常数的方法，并用Ca^2＋选择电极对Na2CO3和Na2C2O4的水解平衡常数进行测定，测定值和文献值相一致．     

入境废纺织品pH值测定方法选用及其影响因子的探讨

为入境废纺织品环境指标之pH检测（表征废物原料的腐蚀性）找到快速有效检测方法．通过比对确定采用平头电极测定废纺织品的表面pH值的方法．经过对各影响因子的讨论，废纺织品表面pH值检测方法具有快速有效准确特点，可以替代水萃取液pH值测定．建议使用表面pH值检测方法作为检验检疫行业标准推荐的测试方法．     

水解反应对国标法测定辣椒碱准确性的影响

对辣椒碱水解反应过程中pH值、NaCl、加热温度及时同对GB10783—1996中辣椒碱含量测定的影响进行了研究。结果表明：（1）pH值对于测定的影响较大。为了得到可靠的测定值,样品pH值须为4～12。（2）当样品中NaCl≤21．8％时,可得到稳定可靠的待测液吸光度值,但当样品中NaCl含量增大,盐析出时,待测液吸光度测定值不稳定。（3）在30℃～90℃下加热1h～2．5h,测定值稳定。     

糠醛在碳纳米管修饰电极上的电化学行为

采用N,N-二甲基甲酰胺分散碳纳米管（CNT）,制备碳纳米管修饰玻碳电极．运用循环伏安法和Tafel曲线法,研究了糠醛在碳纳米管修饰玻碳电极上的电化学行为．实验结果表明：在浓度为0．1mol／L的磷酸盐缓冲溶液（pH6．8）中,碳纳米管修饰电极对糠醛具有良好的催化作用．在扫速为50-1000mV／s的范围内,糠醛的还原峰电流与扫速的平方根成良好的线性关系,表明糠醛在碳纳米管修饰电极上的氧化还原过程是受扩散控制的．在pH值为4-10的范围内,随着pH值的增大,糠醛的还原峰电位逐渐负移．通过Tafel曲线、峰电位与pH值的线性关系,计算得到电化学过程中参加反应的电子数为2,质子数为1,电极反应的电子转移系数为0．644．     

尾式吡啶基锰卟啉修饰电极的作用行为及应用

用电化学法研究了氯化5-[o-(4-(3-吡啶氧基)丁氧基)苯基]-10,15,20-三苯基锰(Ⅲ)卟啉修饰碳糊电极对抗坏血酸催化作用,以及不同pH下抗坏血酸(H_2A)和OH~-在[PyTPP Mn(Ⅲ)]CI的作用机制．pH2．2～5．2范围内,修饰电极对H_2A为一质子参与的电催化机理;随着pH的增加,OH~-和H_2A在电极上形成电催化氧化竞争,pH＞8．2时,由于OH~-逐渐占据了电活性中心,导致OH~-优先于H_2A在电极上电催化氧化,电化学和UV-Vis光谱证明OH~-与卟啉金属中心强烈作用,形成了氢氧根桥联锰卟啉二聚体结构,该修饰电极在酸性条件(pH4．0左右)用于H_2A的测定,在3．992×10~(-6)～4．602×10~(-4)M浓度范围内线性回归方程为Y=0．1449X+0．05894,R=0．9977(n=11);检测限可达7．067×10~(-7)M,并且电极在常温下保存1月,活性仍然稳定。     

光电催化降解双酚A的研究

采用sol—gel法制备TiO2薄膜光电极,以该电极为工作电极,铂丝为对电极,饱和甘汞电极为参比电极,对双酚A的光电催化降解进行了研究,结果表明：该电极具有“型半导体的特征行为．外加偏压为＋0．8V、pH=4,0．88mmol／L的H2O2中,对初始浓度为0．22mmol／L的双酚A溶液光照180min,降解率达70．24％,讨论了氧的存在、外加偏压、双酚A浓度和pH值等因素对光电催化反应的影响。     

氧化钨pH传感器制备及其在F-和胶体溶液中的应用

采用溶胶-凝胶法制备了氧化钨pH电极，在阳极氧化后的Ag丝表面涂敷掺杂了KCl的改性聚乙烯醇和Nation膜，制备了固态Ag／AgCl参比电极，再由氧化钨pH电极与固态Ag／AgCl参比电极制备成氧化钨pH传感器，该传感器不需要参比溶液与陶瓷隔膜．测试结果表明：在pH值为2～11的范围内，该传感器有良好的电位（V）-pH响应线性关系，响应灵敏度为52．6mV（以pH值变化为1来量度），测量精度可达0．1个pH值；氧化钨pH电极具有耐HF腐蚀的能力，在5％～20％（质量分数）的HF溶液中的响应电位具有重现性，可用于HF溶液的浓度测量；氧化钨pH传感器还可以应用于胶体的测量，其响应时间小于1min．     

金属阳离子选择电极测定弱酸强碱盐水解常数方法研究

对弱酸强碱盐水解平衡体系进行讨论 ,导出了弱酸强碱盐水解平衡常数、金属离子浓度和溶液pH值之间的相互关系 ,提出了一种利用金属阳离子选择性电极测定弱酸强碱盐水解平衡常数的方法 ,并用Ca2 + 选择电极对Na2 CO3和Na2 C2 O4 的水解平衡常数进行测定 ,测定值和文献值相一致 .     

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