Al（Ⅲ）—Fe（Ⅲ）共存溶液水解—沉淀过程研究

以连续碱滴定实验为主,结合酸返滴定、ＰＨ驰豫实验和羟基聚合氯化铝铁溶解度测定,研究了Ａｌ（Ⅲ）－Ｆｅ（Ⅲ）共存溶液体系的水解－聚合－沉淀过程的特征化学行为,并解释羟基聚合氯化铝铁溶液的稳定性。     

聚合氯化铝铁的性质与羟铁比的关系及其混凝除藻性能的研究

对聚合氯化铝铁溶液的pH值、可见光OD460、形态分布等性质随羟铁比BFe=[OH-] [Fe3+]的变化规律进行了研究。结果表明,BFe能有效地统一聚合氯化铝铁溶液中的铝铁比和碱化度两参数,且可以表征铝铁共聚物的聚合程度;BFe与铝铁多核羟基络合物的含量Mb呈一定的线性关系,BFe越大,Mb越大,混凝除藻效果亦越好。提出在聚合氯化铝铁的制备过程中BFe是一个至关重要的控制参数。只有当BFe>3时,铝铁体系中才能形成稳定的、高聚合度的铝铁共聚物。     

铝灰渣高效利用的试验研究

以废铝灰渣为原料利用碱酸碱法制备聚合氯化铝,探讨加热温度、混合物配比、保温时间对固相热分解阶段的影响,以铝灰溶出率为指标探索酸溶及碱溶的最佳工艺.对处理后的残渣进行XRD图谱分析,以确定残渣的主要成分.且通过Al-Ferron逐时络合比色法对所制备的聚合氯化铝溶液中铝水解形态进行分析.研究结果表明:经碱酸碱处理后铝灰的溶出率高达95.94%,由此可合成高浓度(0.53 mol/L)高Alb(85%)含量的PAC溶液.且铝灰经此工艺处理后剩余残渣量少,主要成分为α-Al2O3.     

Ferron逐时络合比色法的改进实验研究

改进了经典的Ferron逐时络合比色法，使其能定量测定铝铁共存溶液的形态分布；分析了该实验方法中比色一缓冲溶液的成分和pH值的影响，确定以铝、铁与Ferron反应的等吸收点362nm为测定波长．实验表明，总浓度相同而铝铁比不同的铝铁共存溶液，与Ferron溶液反应后其吸光值都大致相等，且在实验浓度范围内符合朗伯一比尔定律．     

荧光猝灭法测定铁(Ⅲ)-铝试剂络合物稳定常数

首次研究了铁 ( )对铝试剂荧光的猝灭作用 ,用荧光猝灭法测定了铁 ( )铝试剂络合物的稳定常数 .在 p H=4 .7的乙酸缓冲溶液中 ,用 2 97nm紫外光照射铝试剂溶液可以产生很强的荧光 ,最大发射波长为 4 0 9nm.Fe3 +离子可以和铝试剂形成铁 ( )铝试剂络合物 ,使铝试剂的荧光猝灭 .推导了用荧光猝灭法测定络合物稳定常数的计算方法 ,测得铁 ( )铝试剂络合物的条件稳定常数为 lg K′=4 .90± 0 .0 3( n=1 5 ) .     

Sn(IV)Al(Ⅲ)与Fe(Ⅲ)共聚物的化学特征及絮凝效果初探

如何提高絮凝剂的电中和能力，一直是水处理领域探求的热点之一。本文是在铝铁共聚合的基础上引入Ｓｎ４＋，以提高共聚物所带电荷量，并通过水解聚合过程中的电位滴定及试样的扫描电镜像，对其共聚作用的化学特征及晶形貌象做了初步探讨。为深入研究铝铁锡无机高分子絮凝剂提供了必要的实验依据     

聚硅酸硫酸铝铁(PSAFS)的合成

提出了一种新型无机高分子絮凝剂聚合硅酸硫酸铝铁(PSAFS),PSAFS保留了铝铁各自均聚物的优点,克服了聚合氯化铝(PAC)处理后水样中残留铝浓度较高和聚合氯化铁(PFC)稳定性较差的一些缺点,因此,近年来引起国内外的普遍关注.采用水玻璃、硫酸铝和硫酸铁为原料制备聚合硅酸硫酸铝铁,研究了各种因素对该无机高分子絮凝剂絮凝行为的影响,分析了聚硅酸的稳定性、Al/Fe/Si的摩尔比值与絮凝行为的关系,得到了最佳合成条件.     

复合型生物絮凝剂去除低浊水源水中铝的研究

针对传统无机铝盐絮凝剂在处理低温低浊水时残余铝过高的问题,采用中试装置,应用复合型生物絮凝荆(CBF)处理北方地区冬季低温低浊水源水,考察了在不同混凝条件下处理后水中残余铝浓度的变化.结果表明:复合型生物絮凝剂对水中残余铝有很好的效果,在与聚合氯化铝铁复配进行强化混凝的试验当中,混凝效果提高36.1%,总投药量降低了15%,并且消除了聚合氯化铝铁(PAFC)导致的残余铝升高的现象,出水残余铝浓度仅为0.016 mg/L.综合考虑处理效果与投药量,建议复合型微生物絮凝剂与聚合氯化铝铁的最佳复配比为2 mg/L:15 mg/L.     

聚合氯化铝铁在饮用水处理中的生产性实验研究

选择聚合氯化铝铁和硫酸铝在哈尔滨市自来水公司进行了生产规模的对比实验研究.结果表明,聚合氯化铝在控制出水浊度、pH值以及剩余铝方面明显优于传统的硫酸铝.     

掺铝Ni(OH)_2的制备及其电化学性能

利用化学共沉淀方法制备出充放电性能良好的低掺铝量氢氧化镍,并用XRD和IR分析了掺铝氢氧化镍的结构特征.实验结果表明:在氢氧化镍制备过程中适量掺铝可制得比能量较高的α相和β相共存的混合晶型Ni(OH)2,掺铝后α-Ni(OH)2的形成、β-Ni(OH)2相晶粒度的细化及含水量的增加均有利于提高电化学活性.     

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