Neutron diffraction study on the spinel Cu0.72Co2.28O4

A neutron powder diffraction refinement of the positional and thermal structure parameters of Cu_0.72Co_2.28O₄ spinel has been carried out. It has been found that the spinel is inverse, with inversion parameter approximately equal to one half of the copper content value.     

Infrared and permittivity studies on alkali perchlorates

The infrared spectroscopic studies and the dielectric constant measurements during the orthorhombic to cubic transformation of NaClO₄, KClO₄, RbClO₄, and CsClO₄ are reported here to investigate the possibility or not of rotation of ClO₄⁻ in the cubic form. The multiplicity of ν₃, the triply degenerate stretching frequency, change at T_t as it should go from a triplet to a singlet when the crystal structure changes from Cmcm to . The symmetric stretching frequency of ClO₄⁻ is active in Cmcm but symmetry forbidden in . At the respective transition temperature there is a sharp increase in the dielectric constants of these perchlorates proving the transition to be of order-disorder type with the possibility of rotation of ClO₄⁻ at least in NaClO₄ and KClO₄, but involves the discontinuity of properties characteristic of a first-order transition     

各向异性介质中的Green函数解

本文首先指出Ｗａｎｇ与Ａｃｈｅｎｂａｃｈ和Ｈａｎｙｇａ关于任意各向异性，不均匀（但性质渐变）的线弹性介质中的Ｇｒｅｅｎ函数解并非完备解，而是高频条件下的近似解，并以较简洁的步骤及三维Ｒａｄｏｎ变换，得到比文献（１），（２）更合理的Ｇｒｅｅｎ函数在高频近似下显示解。在此基础上具体讨论物均匀，横观各向同性介质中的Ｇｒｅｅｎ函数完备解。     

Bipolar switching properties of amorphous TiO2 thin film grown on TiN/Si substrate

Pt/TiO₂/TiN device with the amorphous TiO₂ film grown at room temperature under an oxygen partial pressure of 1.0 mTorr showed reliable bipolar switching behavior. During the electroforming process, a large number of oxygen vacancies formed in the TiO₂ film and accumulated at the Pt/TiO₂ interface. The barrier height of the Schottky contact of the Pt/TiO₂ interface was reduced owing to the presence of these oxygen vacancies, resulting in the low-resistance state (LRS). Moreover, oxygen ions diffused into the TiN electrode during the electroforming and set processes. On the other hand, the oxygen ions in the TiN electrode diffused out and reacted with oxygen vacancies in the TiO₂ film during the reset process, and the device changed from the LRS to the high-resistance state (HRS). Conduction in the LRS and HRS can be attributed to Ohmic conduction and the trap controlled space charged limited mechanism, respectively.     

所见即所得菜单的设计及应用

针对用菜单命令设计软件不直观，质量低，本文提出了一种所见即所得菜单的设计方法及相应应用。     

关于模糊拓扑环的直积

给出模糊拓扑环族直积的定义,研究它的性质,及任意模糊拓扑环族直积、与其模糊拓扑子环,与其模糊拓扑剩余环之间的同构问题.并对(QU)型模糊拓扑环关于上述问题进行研究.     

相对拓扑的一些性质

讨论了相对超正则的充要条件及相对拓扑空间在映射下的一些性质，并定义了两类新的相对拓扑空间，给出了它们的一些性质．     

X-Ray photoelectron diffraction study of the atomic geometry of the Ge(111)(√3 × √3)R30°-Sn surface

The azimuthal angle dependence of Sn 3d X-ray photoelectron diffraction from the Ge(111)(√3 × √3)R30°-Sn surface has been measured and analyzed kinematically. It has been found that triplets of Sn atoms, the side of the triplet being 3.1 ± 0.1 Å, are formed on the substrate surface although the bonding sites of the triplets to the substrate are yet to be determined.     

Modeling phase equilibria of alkanols with the simplified PC-SAFT equation of state and generalized pure compound parameters

The simplified PC-SAFT equation of state has been applied to liquid–liquid, vapor–liquid and solid–liquid equilibria for mixtures containing 1- or 2-alkanols with alkanes, aromatic hydrocarbons, CO₂ and water. For the alkanols we use generalized pure compound parameters. This means that two of the physical pure compound parameters, m (segment number) and σ (segment diameter), are obtained from linear extrapolations, since m and mσ³, increase linearly with respect to the molar mass, and moreover, the two association parameters (association energy and association volume) were assumed to be constant for all alkanols. Only the dispersion energy is fitted to experimental data. Thus it is possible to estimate parameters for several 1- and 2-alkanols. The final aim is to develop a group contribution approach for PC-SAFT which is suitable for complex compounds, considering that the motivation of this project is to obtain a thermodynamic model which can be used in the development of sophisticated products such as pharmaceuticals, polymers, detergents or food ingredients. One of the severe limitations in applying SAFT-type equations of state to these compounds is that the procedure for obtaining the pure compound parameters is usually based on fitting to saturated vapor pressure and liquid density data over an extended temperature range. However, such data are rarely available for complex compounds. To verify the new pure compound parameters, comparisons to ordinary optimized alkanol parameters, where all five pure compound parameters were fitted to experimental liquid density and vapor pressure data, were made. The results show that the new generalized alkanol parameters from this work perform at least as well as other alkanol parameter sets.     

Information and Self-Organization II: Steady State and Phase Transition

This paper starts from Schrödinger’s famous question “what is life” and elucidates answers that invoke, in particular, Friston’s free energy principle and its relation to the method of Bayesian inference and to Synergetics 2nd foundation that utilizes Jaynes’ maximum entropy principle. Our presentation reflects the shift from the emphasis on physical principles to principles of information theory and Synergetics. In view of the expected general audience of this issue, we have chosen a somewhat tutorial style that does not require special knowledge on physics but familiarizes the reader with concepts rooted in information theory and Synergetics.