磷—钒—钼杂多酸的降解过程及其降解产物的合成

研究了H_mPV_nMo_(12-n)(n=0～2)的降解过程,结果表明:随钒取代数n的增大,其降解产物愈趋稳定。对于钒取代数小的杂多酸。在降解过程中会自动转化成更稳定的钒取代数较大的降解产物。合成了H_5PV_2Mo_(10)O_(40)的降解产物(NH_4)_7H_2PV_2Mo_9O_(39)·15H_2O。利用紫外、红外、热重—差热、x射线粉末衍射等对所合成的产物进行了初步研究。     

稀土—钼—硅三元杂多酸铵盐的合成及其性质

合成了尚未见报导的13种稀土离子和硅、钼组成的三无杂多酸铵盐,产物的组成为(NH_4)_(13)[Ln~r(SiMo_(11)O_(39))_2]·nH_2O和(NH_4)_(12)[CeⅣ(SiMo_(11)O_(39))_2]·nH_2O。用X射线衍射红外、紫外分光、电位滴定、薄板层析、热重—差热分析、静热试验等研究了所得产物。探讨了合成产物阴离子可能的构型及配位情况,考察了整个系列合成产物的稳定性及其变化规律,並作出了可能的解释。对溶液组成的研究表明,溶液里存在着Ln:SiMO_(11)O_(39)~(8-)=1:1和1:2的两种杂多阴离子。     

溶胶—凝胶法合成12—硅钼酸盐及其结构研究

本文报导了用溶胶—凝胶法自生压力下水热合成12—硅钼酸盐,并成功培养出结晶完美的大单晶体。四圆x射线衍射研究结果证明,这种12—硅钼酸盐具有Keggin结构。晶体由SiMo_(12)O_(40)~(4-)杂多阴离子及NH_4~+(C_4H_9)_2N~+H_2和H_2O分子组成,杂多阴离子SiMo_(12)O_(40)~(4-)按晶体所属空间群对称性要求,在三维空间中排列成网状结构,正离子NH_4~+,(C_4H_9)_2N~+H_2及中性水分子则处于网状结构所具有的结构孔道中,以其正电荷及氢键形成能力连接杂多阴离子网状结构,首次将二正丁胺引入杂多酸骨架,且二正丁胺以质子化的形式存在于结构中。     

H_3PW_(12)O_(40)/GO复合材料的制备及光催化性能研究

以磷钨酸(H_3PW_(12)O_(40))和氧化石墨烯(GO)为原料,采用水热方法通过改变反应温度制备H_3PW_(12)O_(40)/GO复合材料。通过傅里叶红外光谱(FT-IR)、X-射线粉末衍射(XRD)、扫描电子显微镜(SEM)和透射电镜(TEM)对合成的材料进行表征及形貌分析,以H_3PW_(12)O_(40)/GO复合材料作为光催化剂催化降解甲基橙、结晶紫、刚果红染料溶液,结果表明:H_3PW_(12)O_(40)/GO复合材料降解甲基橙溶液脱色率达到85.62%,降解结晶紫溶液脱色率达到89.78%,降解刚果红溶液脱色率达到82.62%。     

微波诱导催化降解水中孔雀石绿研究

以纳米级铁酸锌(ZnFe_2O_4)粉体为微波诱导催化剂,构建了微波-ZnFe_2O_4催化反应体系.微波-ZnFe_2O_4反应体系下孔雀石绿(MG)的降解结果表明:20mg·L~(-1)的目标化合物在2 min内基本上被完全去除.利用LC/MS与GC/MS鉴定了孔雀石绿的主要降解产物,并推断其降解途径:逐步脱甲基、共轭生色团的破坏、开环和矿化.对比研究了添加H_2O_2进入微波-ZnFe_2O_4催化反应体系前后降解产物的变化,结果表明:H_2O_2等的加入能大幅提高孔雀石绿降解效率,有助于共轭生色团的破坏,这归因于H_2O_2与催化剂之间发生了Fenton反应.研究为三苯甲烷染料类废水处理提供了新的有效方法.     

Bi_4V_2O_(11)光催化剂的制备及催化性能研究

采用水热法制备光催化剂Bi_4V_2O_(11)并对其光催化降解活性进行研究,通过SEM、XRD、BET等方法来综合分析Bi_4V_2O_(11)的结构、形貌、比表面积.实验结果显示,Bi_4V_2O_(11)在60 min可见光照射下降解Rh B几乎能够降解完全.Bi_4V_2O_(11)较高的光催化活性可能归因于其大的比表面积,窄的带隙和Bi_4V_2O_(11)自身较小的纳米尺寸.还通过捕获实验对Bi_4V_2O_(11)的光催化机理进行研究,并且循环重复使用实验结果说明Bi_4V_2O_(11)降解Rh B具有较强的稳定性.     

新型丁二胺荧光材料的合成、表征及其性能研究

以1,4-丁二胺和硼酸为原料合成了一种有机模板硼酸盐,[C_4H_(12)N_2]∶3B_2O_3∶18H_2O.通过元素分析和化学滴定确定其化学式,通过粉末衍射(XRD)、红外光谱(FT-IR)、热重分析(TGA)等对其进行了表征.此外,利用荧光光谱对不同温度处理后的产物进行性质表征,发现其荧光性质发生明显变化,研究发现在220℃下制备该荧光材料最佳.     

锑离子帽式修饰的α-Keggin结构杂多钼酸盐的合成、结构及性质研究

用钼酸钠、二氧化硅、二氧化锑做原料,在水热条件下合成了2种新的锑离子帽修饰的α-Keggin型多金属氧酸盐(HC_5H_5N)_3SiMo_5~ⅤMo_7~(Ⅵ)Sb_2O_(40) (1)和[Cu(C_(10)H_8N_2)_3](HC_5H_5N)[SiMo_5~ⅤMo_7~(Ⅵ)Sb_2O_(40)]·7H_2O(2)(C_5H_5N=吡啶;C_(10)H_8N_2=2,2′-联吡啶).通过元素分析、红外光谱和X射线衍射方法确定了2种化合物的结构.结果表明:化合物1属于单斜晶系,C2/c空间群,晶胞参数a=4.500 2(3)nm,b=1.401 48(9)nm,c=1.527 17(4)nm,β=103.579 0(10)°,V=9.362 6(10)nm3,Z=8,R_1=0.062 0,wR_2=0.136 2;化合物2属于单斜晶系,P2(1)/n空间群,晶胞参数a=1.572 03(6)nm,b=2.171 07(9)nm,c=2.706 79(11)nm,β=94.659 0°,V=9.207 7(6)nm~3,Z=4,R_1=0.121 9,wR_2=0.163 4.     

Co~(2+)催化超声/H_2O_2降解环丙沙星

论文研究过渡金属离子Co~(2+)对超声/H_2O_2(US/H_2O_2)降解环丙沙星的催化效果,考察了Co~(2+)、H_2O_2添加浓度、反应温度及初始pH值等主要因素的影响。结果表明,Co~(2+)能够有效催化超声/H_2O_2体系降解环丙沙星,降解过程符合假一级反应动力学。H_2O_2浓度在4.0~32.0mmol/L,Co~(2+)浓度在25.8~96.8mmol/L范围,环丙沙星的降解率随H_2O_2和Co~(2+)添加浓度的增加而升高;温度对环丙沙星的降解影响较大,15℃~45℃范围,降解率随温度的升高而升高;初始pH值为3.0时环丙沙星的降解率最高。异丙醇的抑制实验表明,Co~(2+)增强环丙沙星超声降解主要在于·OH的氧化作用。HPLC谱图表明,环丙沙星在Co~(2+)/US/H_2O_2降解体系中主要生成三种产物,推断其通过两种途径进行降解。     

二乙酰丙酮桥联双核镍(Ⅱ)配合物的合成、表征与磁性研究

以高氯酸镍、二苯甲酰甲烷、二乙酰丙酮为原料合成了新型固态三元配合物[Ni_2(C_(10)H_(12)O_4)(C_(15)H_(11)O_2)_2]·3H_2O,并用元素分析、电导率、红外光谱、电子光谱和电喷雾质谱对其进行了表征,确定了配合物的组成,研究了配合物在氮气气氛中的热分解行为.其变温磁化率(2～300K)的测定结果表明桥联双核Ni~(2+)配合物为弱的反铁磁性自旋交换作用,交换参数为J=-1.04cm~(-1),Weiss常数θ=-2.5 K.     

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.     

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