两种不同银源的光敏热成像材料感光性能对比

本文考察了以苯并三氮唑银为银源与以硬脂酸银为银源的水基型PTG材料感光性能的差异,采用了原位法和异位法两种方法来制备不同的PTG材料,并采用了加热显影与湿法显影两种方法显影,结果显示以AgBTA为银源的PTG材料的感光度都比以AgSt为银源的PTG材料的感光度高.通过对乳液pH值和pAg值以及Dember光电压的测定,发现显影过程中以AgSt为银源的PTG材料显影程度要比以AgBTA为银源的PTG材料显影程度高,潜影形成过程中AgBTA体系的潜影形成效率比AgSt体系的潜影形成效率高,导致最终实验结果是以AgBTA为银源的PTG材料的感光度比以AgSt为银源的PTG材料的感光度高.     

Density Prediction for Aqueous Multicomponent Solutions Obeying Isopiestic Relation and Isopycnotic Mixing Rule

The density predictive method based on isopiestic relation has been revised. The accuracy of density prediction based on the isopiestic mixing rule has been compared with that based on the isopycnotic mixing rule on ten aqueous ternary electrolyte systems, one quaternary electrolyte system, and one aqueous ternary nonelectrolyte system at 25°C. Of the ten ternary electrolyte systems, five systems show better predictive accuracy by the isopycnotic method, two by isopiestic relation, and three systems show comparable results. For the aqueous quaternary electrolyte and ternary nonelectrolyte systems, the isopycnotic method gives better predictive accuracy. The overall average error of density prediction based on isopiestic mixing rule is 0.00031, while that based on isopycnotic mixing rule is 0.00017.     

基于环糊精模板法的有机合成

利用"模板"理念综述了基于环糊精模板法的有机合成反应,并将基于环糊精模板法的有机合成反应分为两大类.第一类是基于环糊精"静态模板法"的有机合成,主要是指以环糊精刚性结构主、次面和空腔为模板进行的有机反应.其中,基于环糊精主次面的有机反应主要是体现了模板效应对空间结构的限定.而基于环糊精空腔的有机反应,重点是介绍那些利用环糊精空腔的手性和空间限定性等特点进行化学选择、区域选择和立体选择的反应,这体现了模板效应中的"信息"传递性.第二类有机反应则是基于"动态模板法",该模板自身是可调控的.其中,既可以具有可变空间构象的桥连环糊精二聚体为模板,也可以环糊精衍生物以及环糊精主客体包合物的自组装体系为模板.     

电极扩散层内物质浓度及分布研究方法进展

评述了测试电极扩散层内物质浓度及分布的各种方法,分别从方法原理、实验装置、影响因素及其应用等方面加以论述,评价了各种方法的特点,并对发展方向进行了展望。共引用文献５２篇。     

观念建构为本的化学教学设计研究

以提高学生的科学素养为核心的新课程向以事实为本的课堂教学设计提出了挑战,也为观念建构为本的教学设计提供了展现的平台。在王磊和范晓琼2005年"观念建构为本教学的理论研究"的基础上,提出了观念建构为本的教学设计模型。结合具体教学案例"电离平衡",对如何进行观念建构为本教学设计进行了详细阐述,并提供了电离平衡一节的教学设计。     

A receptor model for urban aerosols based on oblique factor analysis

A procedure is outlined for the construction of receptor models of urban aerosols, based on factor analysis. The advantage of the procedure is that the covariation of source impacts is included in the construction of the models. The results are compared with results obtained by other receptor-modelling procedures. It was found that procedures based on correlating sources were physically sound as well as in mutual agreement. Procedures based on non-correlating sources were found to generate physically obscure models.     

A family of intracules, a conjecture and the electron correlation problem

We present a radical approach to the calculation of electron correlation energies. Unlike conventional methods based on Hartree-Fock or density functional theory, it is based on the two-electron phase-space information in the Omega intracule, a three-dimensional function derived from the Wigner distribution. Our formula for the correlation energy is isomorphic to the Hartree-Fock energy expression but requires a new type of four-index integral. Preliminary results, obtained using a model that is based on the known correlation energies of small atoms, are encouraging.     

Sensitive determination of buspirone in serum by solid-phase extraction and two-dimensional high-performance liquid chromatography

A selective and sensitive determination of buspirone in serum by high-performance liquid chromatography is described. The procedure is based on separation on a C18 column. A solid-phase extraction procedure is used for sample clean-up. The retention on the first column is based on the hydrophobic interaction of buspirone with the stationary phase, and the retention on the second column is based on ionic interactions due to the presence of sodium lauryl sulphate in the mobile phase as well as hydrophobic interaction. This allows for good separation of buspirone from impurities and consequently allows lower detection limits than previously reported for liquid chromatographic methods. Detection by ultraviolet absorbance gives a detection limit of 0.2 ng/ml.     

A New Quaternary Ammonium Heteropolyoxotungstate Catalyst for Propylene Epoxidation to Propylene Oxide

A new quaternary ammonium heteropolyoxotungstant (cat.C) is prepared and characterized. And the cat.C also is an reaction-controlled phase-transfer catalyst. The catalytic system of O2/EAHQ (2-ethylanthrahydroquinone)/cat.c is used for the epoxidation of propylene. Under the optimal conditions, the yield of propylene oxide based on EAHQ is 84.1%, theselectivity for propylene oxide based on propylene is 99.8% and the conversion of propylene based on EAHQ is 84.3%. The cat.c precipitates after the epoxidation reaction for easy separation. The cat. C is stable enough to be recycled three times without any loss in selectivity.     

Optical biosensors based on Prussian Blue films

Optical biosensing schemes based on enzymatically modified inorganic/organic transparent films predominately composed of Prussian Blue are demonstrated. The composite film, which is non-electrochemically deposited on a non-conducting support. is used as an optical transducer for flow-through biosensors based on hydrolases and oxidases. Urease and glucose oxidase are utilized as model enzymes. Action of the urea biosensor is based on optical pH sensitivity of Prussian Blue indicator. The glucose biosensor is acting as first-generation optical biosensor based on in situ generated Prussian White transducer for hydrogen peroxide. These simple, single-pass transmission optical biosensors exhibit sensitivity in the millimolar range of concentration. The biosensors are very stable owing to presence of a poly(pyrrolylbenzoic acid) network in the composite material. This organic polymer plays a dual role as a binding agent for inorganic material and as a functionalized support for strong covalent immobilization of enzyme molecules.     

氧氟沙星选择性电极的改进研究及应用

分别以氧氟沙星-磷钼酸与氧氟沙星-四苯硼钠离子缔合物作为电活性物质制备氧氟沙星选择性电极,并系统研究和比较了这两种电极的响应性能。实验表明以磷钼酸-氧氟沙星离子对作为电活性物质,以四苯硼钠作添加剂所制备的氧氟沙星电极呈现了良好的Nernst响应,且其选择性明显提高。用该电极测定了药物中的氧氟沙星。     

石墨烯复合材料电化学免疫传感器在肿瘤标志物检测中的应用

监测肿瘤标志物水平变化是评估肿瘤治疗效果的重要方法.基于石墨烯复合材料构建的电化学免疫传感器可实现对肿瘤标志物的检测,检测灵敏度高、特异性好,是快速、准确分析肿瘤标志物含量的理想检测工具.本文重点阐述了石墨烯复合材料的电化学免疫传感器在肿瘤标志物检测中的应用进展.总结了其在肿瘤标志物检测中应用的优势和不足,最后对基于石...     

Determination of organic substances by kinetic-catalytic methods of analysis

A review on the determination of organic substances by kinetic-catalytic methods of analysis is given.Methods based on homogeneous catalyzed solution reactions as well as those based on heterogeneous catalyzed electrode reactions are discussed.     

Enumeration of digraphs with a given automorphism group

Four methods are described for enumerating digraphs with a given automorphism group: (1) a generating-function method based on subduced cycle indices, (2) a generating-function method based on partial cycle indices, (3) a method based on the elementary superposition theorem, and (4) a method based on the partial superposition theorem. All of these methods are based on the concept of unit subduced cycle indices and construct a set of versatile tools for combinatorial enumeration. They are applied to the enumeration of five-vertex digraphs with a given automorphism group. The table of marks and its inverse for the symmetric group of degree 5 are recalled. The table of USCIs of this roup is obtained.Dedicated to Professor Frank Harary.     

Design,synthesis, and characterization of main‐chain,aromatic polyesters based on 3,4‐ethylenedioxythiophene

A series of new thermoplastic polyesters based on 3,4‐ethylenedioxythiophene (EDOT) with flexible aliphatic spacers have been synthesized and characterized for the first time. The thermal properties of these polyesters based on EDOT are comparable to those of conventional polyesters based on the 1,4‐phenyl unit, indicating that EDOT is a viable replacement for the phenyl units. The glass‐transition and melting‐transition temperatures decrease monotonically with an increase in the spacer length. Theoretical calculations have revealed that the core angle for EDOT is comparable to that of unsubstituted thiophene and hence should be compatible with the formation of the mesophase. This has been confirmed experimentally by the synthesis of a main‐chain, thermotropic, liquid‐crystalline polyester based on EDOT that exhibits fluid birefringence. In fact, this is the first report in which a main‐chain, liquid‐crystalline polymer based on 3,4‐disubstituted thiophene has been successfully designed and synthesized. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 3479–3486, 2006     

过渡金属氧化物氧还原催化剂的研究进展

过渡金属氧化物（TMOs）是阴离子交换膜燃料电池最有前途的氧还原催化剂之一. 目前,TMOs的氧还原活性同铂基催化剂相比仍然有一定的差距,研究如何合成具有高催化活性的TMOs催化剂非常重要. 导电性和本征活性一直被认为是开发高性能TMOs催化剂的两个关键因素,本文着重总结与评述了近年来有关TMOs氧还原催化剂在导电性和本征活性方面的研究进展,尝试提出了未来提高TMOs氧还原催化活性的努力方向.     

Flow-Through Conductometric Analysis for Microconcentrations of Ammonia in Natural Water with Chromatomembrane Separation into Deionized Water

A new scheme is considered of flow-through conductometric analysis for ammonium ions in natural water, based on chromatomembrane separation of ammonia into deionized water. The proposed scheme is compared in efficiency with that based on dialytic separation of ammonia.