Structural investigation into the non-Arrhenius behavior of fast ion conducting sulfide glasses

The glass forming range of the Ag2S + B 2S3 + GeS2 ternary system was investigated and a wide range of ternary glasses were obtained. The thermal properties of these thioborogermanate glasses were studied by DSC and TMA. The Raman, IR and NMR spectroscopy were used to explore the short-range order structure of the binary (Ag-B) and (Ag-Ge) and ternary (Ag-B-Ge) glasses. The Raman and NMR studies show that Ag2S goes into the GeS2 subnetwork to form pyrothiogermanate groups before going to the B2S3 subnetwork. In doing so, it is suggested that [B10S186- ] superstructure exist in Ag2S + B2S3 and Ag2S + B2S3 + GeS2 glasses. From these observations, a structural model for these glasses has been developed and proposed.;Fast Ion Conducting (FIC) glasses of composition xAg2S + (1-x)[0.5B 2S3 + 0.5GeS2] have been studied using neutron scattering to investigate their short-range order structure and intermediate range order structure. The total correlation functions T(r) were fitted with Gaussian functions and the bond length and coordination numbers of Ge-S, Ag-S and Ag-Ag correlations are determined. It is found that the Ag2S + B2S3 + GeS2 glasses are composed of a B 2S3 network containing [B10S18 6-] superstructure and an over-doped GeS4/2 network. The existence of boron superstructure contributes to the high mobility and conductivity of Ag ions. The temperature and composition dependence of Ag-Ag correlation supports that Ag ion interaction is a factor that cannot be ignored at relatively high temperature and could explain the origin of the non-Arrhenius behavior.;Conductivity measurements of zAgI + (1-z)[xAg2S + (1-x)(0.67B 2S3 + 0.33GeS2)] fast ion conducting glasses were performed to explore the non-Arrhenius behavior above room temperature. A distinct non-Arrhenius deviation is observed that causes the dc conductivity to be lower than the expected values. Ion Trapping Model has been used to describe the non-Arrhenius conductivity and fit the experimental data. It is found that the model is able to accurately reproduce the non-Arrhenius temperature dependence of the conductivity of these optimized fast ion conducting glasses. The model has only one independently adjustable parameter and it provides a physical picture of the cause of non-Arrhenius deviation

Existence and Asymptotic Stability of Periodic Solutions for Impulsive Delay Evolution Equations

In this paper, we are devoted to consider the periodic problem for the impulsive evolution equations with delay in Banach space. By using operator semigroups theory and fixed point theorem, we establish some new existence theorems of periodic mild solutions for the equations. In addition, with the aid of an integral inequality with impulsive and delay, we present essential conditions on the nonlinear and impulse functions to guarantee that the equations have an asymptotically stable $\omega$-periodic mild solution

A Study on the Research Status and Trends of the Connection Between Secondary and Higher Vocational Education Curriculum in China: Based on the Thesis About the Connection Between Secondary and Higher Vocational Education in the CNKI.Net

In the paper, the bibliometrical method has been used to explain the thesis about the connection between secondary and higher vocational education in the CNKI. Net. The research content has those such as the amount of published papers, concept and positioning, theoretical foundation, content of cohesion, cohesion way, problem of attribution and strategy, pilot reform and practice, security system and measures, the international comparison study, etc.. The study wants to find the research focus and development status of the connection between secondary and higher vocational education in china, and to provide research foundation for the future development

International Comparative Study on the Curriculum Connection between Middle and Higher Vocational Education

The modern vocational education system is the premise and logical starting point of the Curriculum Connection between Middle and Higher Vocational Education , which is the foundation of constructing modern vocational education system. The international comparative study method is employed to organize, study and analyze the Curriculum Connection between Middle and Higher Vocational Education in the major developed countries in the world. The thesis is aimed at finding the distinctive development characteristics and common development rules of the Curriculum Connection between Middle and Higher Vocational Education in main developed countries,so as to provide experience reference for the future theoretical research and practical research in China

Research on Risk Assessment Technology of the Major Hazard in Harbor Engineering

AbstractThe increased construction of harbor infrastructure has led to distinct safety problems recently. A lack of an efficient risk assessment method to evaluate the major hazard (procedure) in harbor engineering has become a vital reason for frequent grave accidents in harbor engineering area. This work, taking the features of harbor engineering into account and starting from the basic concept of “risk”, sets a risk level evaluation standard for both accident consequence measure index and accident possibility measure index based on the survey of current situation of construction enterprises, thus realizing the quantitative assessment and classification towards major hazard and providing rules for major hazard risk assessment on harbor engineering project in the future