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1.
应用一价阳离子选择性电极和氯离子选择性电极组成可逆电池,通过测定电池的电动势,运用扩展的Debye-Hückel公式,计算求得了RbCl在水及(H2O-CH3OH)混合溶剂中的活度系数及其一级、二级和总介质效应,并据电解质溶液的溶剂化理论对RbCl的活度系数某些变化规律进行了讨论.  相似文献   

2.
应用Corning一价阳离子选择性电极和Orion固态氯离子选择性电极组成无液接可逆电池Cl--ISE/RbCl(m),H2O(1-x),DMF(x)/M+-ISE通过测定上述测量电池的标准电动势(Em),根据溶液热力学原理,运用扩展的Debye-Huckel公式,计算求得了RbCl由H2O至(H2O-DMF)混合溶剂的标准迁移吉布斯自由能ΔGt。运用Cox离子溶剂化配位模型,求得了RbCl在混合溶剂化数(n++n-),并对RbCl溶剂化数的某些变化规律进行了初步的讨论。  相似文献   

3.
应用Corning一价阳离子选择电极(M^+ ̄ISE)和Orion氯离子选择性电极(Cl^- ̄ISE)组成可逆电池,即Cl^- ̄ISE/RbCl(m),H2O(1-x),DMF(x)/M^+ ̄ISE 通过测定上述测量电池的标准电动势(Em^0/mV),根据溶液热力学原理,运用扩展的Debye-Hueckel公式,计算求得了RbCl由H2O至(H2O ̄DMF)混合溶剂的标准迁移自由能(ΔGt^0/k  相似文献   

4.
应用Corning一价阳离子选择电极(M+~ISE)和Orion氯离子选择性电极(Cl-~ISE)组成可逆电池,即Cl-~ISE/RbCl(m),H2O(1-x),DMF(x)/M+~ISE通过测定上述测量电池的标准电动势(E0m/mV),根据溶液热力学原理,运用扩展的Debye~Hückel公式,计算求得了RbCl由H2O至(H2O~DMF)混合溶剂的标准迁移自由能(ΔG0t/kJ·mol-1)和RbCl在(H2O~DMF)混合溶剂中的活度系数(γ±),并对上述热力学性质随混合溶剂组成的变化规律进行了初步的讨论.  相似文献   

5.
应用Corinng一阶阳离子选择性电极Orion固态氯离子选择性电电极组成无液接可逆电池Cl^-1-ISE/RbCl(m),H2O(1-x),DMF(x)/M^+-ISE通过测定上述测量电池的标准电动热。  相似文献   

6.
RbCl在含水混合溶剂中热力学性质的测定和研究(298.15K)   总被引:2,自引:0,他引:2  
用一价阳离子选择性电极和氯离子选择性电极组成可逆电池,通过测定电池的电动势(E/mV),据热力学原理,引用扩展的Debye-Hückel公式,求算了RbCl由H2O至(H2O-MeOH)和(H2O-DMF)混合溶剂的标准转移Gibbs自由能(ΔG°t/kJ·mol-1)及其在水和混合溶剂中的活度系数(γ±),并据离子溶剂化理论对RbCl的ΔG°t和γ±某些改变规律进行了讨论.  相似文献   

7.
应用Corning一价阳离子选择性电极(M+-ISE)和固态氯离子选择性电极(Cl--ISE)组成可逆电池,通过测定电池的标准电动势(Eom)求得了RbCl由H2O至(H2O-MeOH)和(H2O-DMF)混合溶剂的标准迁移自由能(ΔGot),并对ΔGot的某些变化规律进行了初步的讨论.  相似文献   

8.
应用Corning一价阳离子选择性电极和Orion氯离子选择性电极组成可逆电池,测定其电动势(E/mV),用扩展的Debye-Hückel公式,求得7个实验温度下(283.15K~318.15K),4个指定组成溶剂和浓度的RbCl的活度系数(γ±)及其温度系数(lnγ±/T)p,mi,计算了RbCl在水及混合溶剂(H2O-DMF)中的相对偏摩尔自由能(GB、R)、焓(HB、R)和熵(SB、R),并对RbCl的相对偏摩尔性质的某些变化规律作了初步讨论.  相似文献   

9.
应用Corning-价阳离子选择性电极和Orion氯离子选择性电极组成可逆电池,测定其电动势(E/mV),用扩展的Debye-Huckel公式,求得7个实验温度下(283.15K ̄318.15K),4个指定组成溶剂和浓度的RbCl的活度系数(γ±)及其温度系数(δlnγ±/δT)p,mi,计算了RbCl在水及混合溶剂(H2O-DMF)中的相对偏摩尔自由能(G↑-B,R)、焓(H↑-B、R)和熵(S  相似文献   

10.
在恒定溶液总离子强度I=1.00mol·kg-1,改变特丁醇在混合溶剂中的质量百分数x=5%、15%和20%的条件下,测定了无液接电池(A)和电池(B)的电动势,确定了混合溶剂中的Ag-AgCl电极的标准电极电势,讨论了HCl的迁移性质;计算了HCl在该体系中的活度系数γA,结果表明,对于所讨论的体系,在溶液中总离子强度保持恒定,HCl的活度系数服从Harned规则.在溶液组成恒定时,lgγA是温度倒数1/T的线性函数,计算了HCl一级,二级和总介质效应  相似文献   

11.
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.  相似文献   

12.
何延凌 《科技信息》2008,(4):258-258
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.  相似文献   

13.
王慧 《科技信息》2008,(10):240-240
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.  相似文献   

14.
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.  相似文献   

15.
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。  相似文献   

16.
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.  相似文献   

17.
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.  相似文献   

18.
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-  相似文献   

19.
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-  相似文献   

20.
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  相似文献   

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