三元体系Y(NO_3)_3-Cu(NO_3)_2-H_2O(35℃)的研究

本文研究了Y(NO_3)_3-Cu(NO_3)_2-H_2O三元体系在35℃下的相平衡,测定了各饱和液相的折光率。结果指出:该体系中未发现有Y(NO_3)_3与Cu(NO_3)_2的复盐生成。     

三元体系LiNO_3—UO_2(NO_3)_2—H_2O的研究0°,30°,45℃

1、研究了三元体系LiNO_3-UO_2(NO_3)_2-H_2O在0°,30°,45°时的溶度及30°与45°时饱和溶液的折光率。2、在0°时的溶度曲线由两支组成,分别与LiNO_3·3H_2O及UO_2(NO_3)_2·6H_2O相当,共饱和溶液的组成为:UO_2(NO_3)_2 17.51%,LiNO_3 23.33%。在30°与45°时的溶度曲线与折光率曲线均由三支组成,分别与LiNO_3、UO_2(NO_3)_2·3H_2O及UO_2(NO_3)_2·6H_2O相当,与LiNO_3、UO_2(NO_3)_2·3H_2O对应的共饱和溶液的组成在30°时为:LiNO_347.69%,UO_2(NO_3):18.98%,在45°时依次为38.62%,32.32%.与UO_2(NO_3)_2 3H_2O和UO_2(NO_3)_2·6H_2O对应的共饱和溶液的组成在30°时约为LiNO_3 30.0%,UO_2(NO_3)_234.0%,在45°时依次为:13.25%与57.10%。3、在所研究的温度下,并未现LiNO_3·(1/2)H_2O的存在。     

硝酸铒与DL—α—蛋氨酸配合行为研究

测定了三元体系Er(NO_3)_3。—Met—H_2O在25℃时的溶度和饱和溶液的折光率,结果表明该体系可形成两种配合物,即Er(Met)(NO_3)_3·H_2O与E_r(Met).(NO_3)_3·6H_2O。用相平衡方法合成了 1:4型配合物,通过元素分析、IR、UV、X 粉末衍射、TG—DTG与DSC对其进行了物化性质表征,并讨论了配合行为。     

含镍磁黄铁矿硝酸浸出液中硝酸镁与硫酸镁的分离

硝酸催化浸出是处理金属硫化物的有效方法。用这种方法在较低温度和氧压下成功地处理了含镍磁黄铁,但矿石中的氧化镁与硫酸和硝酸反应生成硫酸镁和硝酸镁,后者消耗了大量硝酸;因而需要分离硫酸镁,返回使用硝酸镁才能保证浸出过程经济地进行。本研究测定了Mg(NO_3)_2-MgSO_4-H_2O系在343K,308K,以及Mg(NO_3)_2-MgSO_4-C_2H_5OH-H_2O系在298K的平衡相图。结果表明,蒸发结晶法及乙醇结晶法均能有效地分离出硫酸镁,但后者更为节能。加10％乙醇即可使硫酸镁与硝酸镁较好分离。     

La(NO_3)_3在HZSM-5分子筛表面上的自发单层分散

本文采用La(NO_3)_3·6H_2O与HZSM-5分子筛相混合研磨,并在不同时间,不同温度(低于La(NO_3)_3·6H_2O的分解温度393K)下,加热。用X射线晶体衍射,X射线光电子能谱检测其分散情况。实验证明,La(NO_3)_3能够以单层形式分散在HZSM-5表面上。     

阳离子交换法研究溶液中铈(Ⅲ)——硝酸根配合物的组成和稳定常数的测定

本文用阳离手交换法研究了铈(Ⅲ)——硝酸根配合物的组成,在酸度为7M时,溶液中除了Ce NO_3~(2 )和Ce(NO_3)_2~ 之外,还发现有Ce(NO_3)_3和Ce(NO_3)_4~-两种配合物存在.它们的稳定常数分别为β_1=1.18、β_2=O.55、β_3=0.15和β_4=0.02.Ce~(3 )、CeNO_3~(2 )和Ce(N0_3)_2~ 均能与欧离子交换树脂进行交换,它们的分配系数分别为27.7、15.5和3.37.     

Phase relationship of complex multi-component system in chromate cleaner production

The phase relationships of the complex multi-component systems in the liquid-phase oxidization and separation process related with the chromate cleaner production are investigated theoretically and experimentally.The phase diagram of main system Fe- Cr_2O_4-KOH-O_2 of oxidization process and the relationship of its standard Gibbs free energy change with temperature are calculated.A se- ries of phase diagrams of the separation process at different temperatures,such as K(Na)OH-K(Na)_2CrO_4-H_2O,KOH-KAlO_2-H_2O, K(Na)OH-K(Na)_2CO_3-H_2O,K(Na)OH-K(Na)HCO_3-H_2O and K(Na)HCO_3-K(Na)_2CrO_4-H_2O have also been calculated.Some ex- periments are carried out to verify the calculated results.Our results showed that the sub-molten salt media are suitable for the oxidization and separation processes;FeCr_2O_4 can be oxidized across a wide range of temperature;K(Na)_2CrO_4 can be separated from K(Na)AlO_2 system at appropriate temperature and proper concentration;the crystallization of carbonate is easier than that of K(Na)_2CrO_4.     

六水合硝酸镧和六水合硝酸铈的热分解

本文采用TG、DTA和DSC法研究了La(NO_3)_3·6H_2O和Ce(NO_3)_3·6H_2O的热分解,并通过IR和X—射线法对反应物、中间产物和最后产物进行了鉴别,发现六水合物均经多个步骤脱水生成无水盐。生成的无水硝酸镧又经一系列中间产物的分解过程最后变成La_2O_3;而生成的无水Ce(NO_3)_3则直接分解成最终产物CeO_2。     

羧基桥联的双核Cu（Ⅱ）配合物的合成及性质初步研究

合成了二个新的一个分子中含有二个羧基桥联的双核 Cu(Ⅱ)配合物[Cu(Phen)(HCOO)]_2·(NO_3)_2·3H_2O(1),[Cu(Phen)(CH_3COO)]_2·(NO_3)_2·3H_2O(2)和一个一分子中含有一个羧基桥和一个羟基桥的双核 Cu(Ⅱ)配合物[Cu_2(OH)(C_2H_5COO)(Phen)_2]·(NO_3)_2·H_2O(3)以及单核 Cu(Ⅱ)配合物[Cu(Phen)(CF_3COO)]·(NO_3)·H_2O(4)(其中 Phen 为2,9-=甲基-1,10-啡罗啉).通过元素分析,等离子光谱、红外光谱,TG 及 X-射线粉末衍射分析对四个配合物进行了初步表征,测定了它们的氧化还原电位及电导.通过分析讨论,确定了配合物中羧基的配位方式.     

稀土硝酸盐与L—α亮氨酸固体配合物的合成与表征

在无水乙醇和苯的混合溶剂中,制得了稀土硝酸盐和L—a亮氨酸的6种固体配合物.经化学分析、元素分析和热重分析确定了其组成是RE(Leu)_3(NO_3)_3H_2O(RE=Pr,Nd,Sm,Eu,Gd)和Dy(Leu)_4(NO_3)_3·H_2O(Leu=Leucine亮氨酸);测定了熔点,并通过TG—DTG比较了它们的热稳定性.     

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.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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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