镧系元素三元协萃规律研究——ABB类(HPMBP-N503-TOPO)三元协萃Tb~(3+)、二元协萃Nd~(3+)机理

本文研究1-苯基3-甲基-4-苯甲酰基吡唑啉酮-5(HPMBP)、N,N-二(1-甲庚基)乙酰胺(N503)、三辛基氧化膦(TOPO)的甲苯溶液,从高氯酸底液中分别萃取Tb~(3+)及 Nd~(3+)机理。实验发现Nd~(3+)只有二元协萃(HPMBP+N503,HPMBP+TOPO),无三元协萃效应,但Tb~(3+)存在三元协萃。根据实验数据得到一元、二元、三元萃取平衡常数分别为logβ_1,T_b=-3.64,logβ_1,Nd=-4.41(HPMBP体系,生成萃合物为Tb(PMBP)_3、Nd(PMBP)_3);logβ_1~*,T_b=-2.64,logβ_1~*,N_d=-3.41(萃合物为Tb(PMBP)_3(HPMBP)、Nd(PMBP)_3(HPMBP)); logβ_(12),T_b=1.45,logβ_(12),N_d=0.959(HPMBP+N503体系);logβ_(13),T_b=6.40,logβ_(13),N_d=5.65(HPMBP+TOPO体系);logβ_(123),T_b=4.01(HPMBP+N503+TOPO三元体系)。     

表面活性剂对稀土荧光反应的影响——Ⅰ 离子型表面活性剂存在下 Ln~(3+)(Ln=Sm,Eu,Tb)-β-二酮、Ln~(3+)-β-二酮-有机碱及水溶性体系的荧光光谱

讨论了阴离子型表面活性剂(SDS)和阳离子型表面活性剂(CTMAB、Zeph 和 CPC)对 Ln~(3+)-β-二酮二元体系、Ln~(3+)-β-二酮-Phen(或 DPG)三元体系及 Tb~(3+)-AA-EDTA、Tb~(3+)-Tiron、Tb~(3+)-H_2Sal-EDTA 水溶性体系荧光光谱的影响,发现不同的表面活性剂对不同的反应体系影响不尽一致.增敏程度与表面活性剂和荧光配位体的结构有关。     

毛细管电泳中使用二元环糊精体系拆分CBI-氨基酸对映体

在毛细管胶束电动色谱中，以β-环糊精(β-CD)和羧甲基-β-环糊精(CM-β-CD)组成的二元体系作为手性选择剂，对两种相对较难手性拆分的萘-2，3-二甲醛氨基酸衍生物(CBI-DL-Ser，CBI-DL-Glu)进行对映体分离．结果表明，该二元环糊精体系在拆分CBI-DL-Ser和CBI-DL-Glu时具有协同效应，在实验选定的条件下，两者均能达到完全手性拆分。     

β-FeOOH/盐酸羟胺/H_2O_2非均相Fenton降解酸性橙Ⅱ

利用水热法合成棒状β-FeOOH,研究了在β-FeOOH/H_2O_2组成的非均相Fenton体系中加入低浓度的盐酸羟胺(HH)对酸性橙Ⅱ(AOⅡ)的去除效果,同时考察了pH值、H_2O_2浓度、HH浓度对其去除率的影响.结果表明:反应体系pH值、H_2O_2浓度、HH浓度对AOⅡ去除效果有较大影响,当反应体系pH值为3.0、c(H_2O_2)和c(HH)分别为2.5,0.5 mmol·L~(-1)时,β-FeOOH对AOⅡ的去除率较高,达到97.82%.该体系由均相和非均相Fenton反应体系共同组成,自由基捕获实验结果表明该体系的活性物为·OH.洗脱实验证明吸附阶段去除的AOII在催化阶段被降解.经4次循环使用之后β-FeOOH仍有较高的催化活性.     

β-环糊精与十二烷基硫酸钠的包结作用

用表面张力法研究了-环糊精(β-CD)与十二烷基硫酸钠(SDS)在水溶液中的包结作用.通过固定SDS的浓度,改变溶液中β-CD的浓度,发现体系的表面张力随β-CD浓度的增加而增加到一稳定值.实验发现溶液中加入β-CD时表面张力比不加入β-CD要大,但在临界胶束浓度以上,各体系的表面张力值均相同.表明水溶液中β-CD及其与SDS形成的包结物都没有表面活性,且临界胶束浓度与β-CD的浓度存在一定的线性关系.用数学方法计算出了β-CD与SDS形成1:1型包结物的包合常数.     

1-溴代萘、2-溴代萘与β-环糊精间包络差异的研究

研究了在含有正丁醇（1—Bu)的β—环糊精(β—cD)溶液中，加入有机小分子苯酚(Phenol)后诱导2—溴代萘(2—BrN)发射强的室温磷光(RTP)的光谱性质，比较了1—BrN／β—cD／1—Bu/Phe—nol与2—BrN／β—cD／1—Bu/Phenol四元体系的RTP光谱，通过测定1—BrN和2—BrN在所研究的各体系中与β—cD的包络常数，分析了1—BrN和2—BrN与β—cD的不同包络方式，并初步揭示了分子结构的空间差异对包络方式和包络作用的影响．     

二硫化钼复合材料的构建与对Aβ的灵敏检测

为解决传统检测阿兹海默症标志物Aβ的荧光方法普遍存在灵敏度低、背景干扰大以及操作过程繁琐的缺点,通过超分子自组装的方法将3种不同波长的荧光探针(白藜芦醇(Res)、硫磺素T(ThT)和4-(二氰基亚甲基)-2-甲基-4H-吡喃衍生物(DCM-OH))与二硫化钼进行复合,通过高分辨质谱和高效液相色谱表征了3种化合物的结构以及纯度,利用扫描电镜和透射电镜研究了复合材料的形貌结构,并对两种不同分子量的肽段片段Aβ(1～40)和Aβ(1～42)进行了检测。结果显示:复合材料结构规整均一,3种体系均能实现对Aβ(1～40)和Aβ(1～42)的灵敏检测;通过合成得到的DCM-OH与MoS_2的复合体系粒径分布均一,生物相容度好,对Aβ(1～42)有更低的检测下限(6.8 nmol/L),具有潜在应用价值。     

Cu(Ⅱ)-正己(辛)烷基亚氨二乙酸-氨基酸体系混配型配合物的研究

用pH电位法研究了Cu(Ⅱ)-正己(辛)烷基亚氨二乙酸(H_2A)-氨基酸(氨基乙酸、DL-α-氨基丙酸、DL-α一氨基丁酸、β一氨基丙酸或DL-β-氨基丁酸,统以HB表示)体系的混配型配合物。导出了第一配体(正己(辛)烷基亚氨二乙酸根离子)与Cu(Ⅱ)(1:1)配合完全的[H]计算式。在25±0.1℃,μ=0.1(KNO_3)的条件下,测定了该体系的混配型配合物的稳定常数。结果表明:IgK_(CuAB)与第一配体的关系不大,而主要与第二配体有关;IgK_(CuAB)与Igβ_(CuB_2)存在线性关系。     

尿素—苯甲酸— —萘酚三元系相图研究

用目视变温法研究了CO(NH_2)_2-C_3h_3COOH-β-C_10H_7OH三元有机体系,结果表明:二元固液同组成化合物CO(NH_2)_2·2β-C_10H_7OH在本三元体系中变成了固液异组成化合物;本三元体系有二个四相平衡不变点,其一是低共熔点:60℃,21.5%CO(NH_2)_247%C_6H_5COOH,其二是一转熔点:70℃,13%CO(NH_2)_2,40%C_(?)H_5COOH(均为重量百分数)。     

环糊精对鹰嘴豆异黄酮的包合作用

用研磨法制备β-环糊精(β-CD)及羟丙基-β-环糊精(HP-β-CD)与鹰嘴豆异黄酮(CAI)的包合物,由红外吸收光谱对包合物进行表征,并运用紫外分光光度法测试包合体系吸光度的变化.根据Benesi-Hildebrand方程确定了包合反应的表观包合稳定常数Kfθ和包合反应的热力学参数ΔGθ,ΔHθ和ΔSθ,并由此得出包合反应主要由焓变控制,推动力为范德华力.     

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.     

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.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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