一种基于联二萘酚的缩氨基硫脲化合物的合成及其对锌离子的荧光识别

合成了一种以联二萘酚为荧光团的缩氨基硫脲类荧光探针BSB1，并表征了其结构．在DMSO-HEPES缓冲液（1：1，v/v， HEPES 1．0×10^-2 mol/L，pH ＝7．4）中，BSB1对Zn2＋具有选择性识别作用，在572 nm处呈现较强的荧光发射．BSB1与Zn2＋以1：2的方式结合，对Zn2＋的结合常数为3．7×10^9 L2/mol2．     

碱渣对重金属的竞争吸附实验研究

本研究从竞争吸附系数的角度探讨了三种重金属共存时碱渣表面的吸附规律。研究显示,随着体系pH和初始浓度的升高,Cu2＋的竞争吸附系数呈下降趋势,Zn2＋、Cd2＋呈上升趋势;但是随着温度的升高Cu2＋竞争吸附系数呈现升高的趋势,Zn2＋、Cd2＋的竞争吸附系数则呈现减小的趋势。Zn2＋、Cd2＋呈现明显的协同吸附作用,而Zn2＋、Cd2＋与Cu2＋则呈现拮抗作用。     

方程sum from k =0 to n的根与系数的关系

在高等代数中o）,一元n决方程。。x。＊。;x”－‘＊…牛。n;x＋。n。则。。一o）的根与系数的关系是当n＝2时,就是中学数学中的韦达定理。在实际问题中,我们常遇到无理方程：等的根与系数的关系问题。怎样有效简便地解决此类问题非常重要。经研究,得如下结论。（）当q是偶数且方程10y”－oly”－‘＋…＋。n＿ly＋。。二0有r个非负根yi,yZ,…,y,时,方程（）有Zx个根xl,。2,…,22r,满足（h）当q是奇数时,方程（）有Zn个根xl,1。,…,1。n,满足rl,rZ,…,yn是方程。。／＋。l／‘＋…＋。。lr＋。n＝0的n个根。特别,…     

水合锌（Ⅱ）离子团簇的量子化学研究

应用高水平的量子化学方法MP2/6-311＋＋G（2d,2p）//B3LYP/6-31＋＋G（d,p）,对气相中的[Zn（H2O）n]2＋（n=1-9）团簇进行研究,优化几何构型,计算了其最稳定构象的结合能及振动频率.结果表明,当n=1-6时,离子与第一水合层中氧原子的平均距离RZn-O逐渐变长;而当n=6-9时,RZn-O却逐渐变小.同时,随着配位水分子数的增加,连续结合能逐渐减小,Zn2＋及第一水合层中氢原子上的正电荷逐渐减小,而第一水合层氧原子上的负电荷变化不大,表明水合分子的电荷极化主要表现为从Zn2＋到H原子的电荷转移.     

纤锌矿Zn1-xMgxO合金相结构稳定性的第一性原理研究

采用基于密度泛函理论中局域密度近似下的VASP程序包,在考虑所有掺杂构型前提下,对Zn1-xMgxO合金的晶格参数、禁带宽度以及形成焓随Mg含量的变化进行了系统地计算.计算结果表明：随着Mg含量的不断增加,纤锌矿Zn1xMgxO合金的平均晶格常数变化不遵循Vergard定律;合金的禁带宽度随着Mg含量增加满足二次函数关系Eg=3.43＋2.24x＋0.68x2,与实验结果一致,不同掺杂原子构型禁带宽度的差异是纤锌矿Zn1-xMgxO合金中发光光谱宽化的重要原因;对比分析纤锌矿、闪锌矿和熔岩矿三种相结构的Zn1-xMgxO合金形成焓的计算结果发现,当Mg掺杂比例为37.5%时,Zn1-xMgxO合金由纤锌矿向熔岩矿结构转变;闪锌矿Zn1-xMgxO合金形成焓始终低于纤锌矿,在特殊的条件下,可以形成闪锌矿Zn1-xMgxO合金相.     

Cu~(2 )、Zn~(2 )对老年低额溞的联合毒性试验

在研究了 Cu2＋和 Zn2＋分别对老年低额溞Simocephalus vetulus Straus 96 h急性毒性反应的基础上,采用相加指数法进行了联合毒性试验。结果表明： Cu2＋对老 年低额溞24、 48、 72、 96 h LC50分别为 0.83、 0.71、 0.61、 0.55 mg/L; Zn2＋对 老年低额溞24、 48、 72、 96 h LC50分别为 0.89、 0.54、 0.42、 0.30 mg/L。 Cu2 ＋和 Zn2＋对老年低额溞的安全浓度（ Sc）分别是 0.0055 mg/L和 0.0030 mg／ L。当 C u 2＋与 Zn2＋共存时其联合毒性发生拮抗作用。     

基本不等式及其推广的一个共同证法

基本不等式及其推广的（1）n（a1m＋a2m＋…＋anm）≥（a1k＋a2k＋…＋ank）（a1(m-5)＋a2(m-k)＋…＋an(m-k)）（2）（a12＋a22＋…＋an2）（b12＋b22＋…＋bn2）≥（a1b1＋a2b2＋…＋anbn）2等的共同证法。     

不动点集为RP(2)×HP(2n)及RP(2)×CP(2n)(n=1,2,3)的对合流形

对合的不动点集是微分周期映射的一类重要课题,这方面已有很多结果,但大多数结果是考虑不动点集为射影空间及其并集的情形．对于射影空间乘积的结果很少．设（Mn,T）是带有光滑对合（Involution）的”维光滑闭流形．7”在Mn上的不动点集为F．本文中,笔者讨论了F—RP（2）XHP（Zn）和F—RP（2）XCP（Zn）（n—1,2,3）的可能的协边分类情形．定理1设（MS””‘”‘,7”）是sn＋2＋h维带有光滑对合7”的闭流形（h＞0）．它的不动点集为RP（2）XHP（Zn）（n为全体自然数）．于是,有且仅有下列情况：（l）h—2＋sn,（M’”…     

便携式重金属测定仪在环境应急监测中的应用

建立了用便携式重金属测定仪同时测定地下水中Cu2＋/Zn2＋/Pb2＋/Cd2＋重金属离子的方法。采用澳大利亚Cogent公司生产的PDV6000plus重金属测定仪,三电极系统,工作电极为玻碳电极,参考电极为银-氯化银电极,内部充满KCI溶液为流动相、对电极为Pt电极,仪器在4min内完成Cu2＋/Zn2＋/Pb2＋/Cd2＋重金属离子的的测定。Cu2＋/Zn2＋/Pb2＋/Cd2＋浓度在10-8000ppb范围内与响应信号线性关系良好,方法检出限为5ppb,加标回收率为98.1%～100.1%,方法简便...     

三维网状冠醚配合物的合成与晶体结构

研究了二苯并18-冠-6、KSCN与ZnCl2在1,2-二氯乙烷中的反应,得到标题配合物：[K（18-C-6）（CH3CN）]2[Zn（NCS）4]。通过元素分析、红外光谱、单晶X-射线衍射对进行了表征。配合物由两个[K（DB18-C-6）（CH3CN）]^＋配阳离子,一个[Zn（Ncs）4]^2-配阴离子组成。处于冠醚中心的K^＋除了与[Zn（NCS）4]^2-中NCS基团的S原子成键外,还与另一个[K（18-C-6）（CH3CN）]2[Zn（NCS）4]离子对的硫原子存在弱相互作用。相邻配合物离子对通过K…S和S…S弱相互作用形成三维网状结构。     

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     

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