MapReduce Integrated Multi-algorithm for HPC Running State Analysis

High-performance computer clusters are major seismic processing platforms in the oil industry and have a frequent occurrence of failures. In this study, K-means and the Naive Bayes algorithm were programmed into MapReduce and run on Hadoop. The accumulated high-performance computer cluster running status data were first clustered by K-means, and then the results were used for Naive Bayes training. Finally, the test data were discriminated for the knowledge base and equipment failure. Experiments indicate that K-means returned good results, the Naive Bayes algorithm had a high rate of discrimination, and the multi-algorithm used in MapReduce achieved an intelligent prediction mechanism

Benefits of International Education Cooperation: Perspectives from China-Cameroon Education Cooperation

This study analyses the benefits of international education cooperation with spotlight on the educational cooperation between China and Cameroon. The paper discussed the theoretical framework of the benefits of international education cooperation, it explores the nature and structure of international education cooperation with focus on the China-Cameroon cooperation and concludes with the benefits to both partners in this type of cooperation. Keywords: International Education, Cooperation, China, Cameroon DOI: 10.7176/JEP/10-29-03 Publication date:October 31st 201

System-level coupled modeling of piezoelectric vibration energy harvesting systems by joint finite element and circuit analysis

A practical piezoelectric vibration energy harvesting (PVEH) system is usually composed of two coupled parts: a harvesting structure and an interface circuit. Thus, it is much necessary to build system-level coupled models for analyzing PVEH systems, so that the whole PVEH system can be optimized to obtain a high overall efficiency. In this paper, two classes of coupled models are proposed by joint finite element and circuit analysis. The first one is to integrate the equivalent circuit model of the harvesting structure with the interface circuit and the second one is to integrate the equivalent electrical impedance of the interface circuit into the finite element model of the harvesting structure. Then equivalent circuit model parameters of the harvesting structure are estimated by finite element analysis and the equivalent electrical impedance of the interface circuit is derived by circuit analysis. In the end, simulations are done to validate and compare the proposed two classes of system-level coupled models. The results demonstrate that harvested powers from the two classes of coupled models approximate to theoretic values. Thus, the proposed coupled models can be used for system-level optimizations in engineering applications

Micro-patterned TiO2 films for photocatalysis

Titanium dioxide film as a stable material plays an important role in photocatalytic degradation of pollutants. One of the ways to improve photocatalytic efficiency is to increase the active sites on the semiconductor surface. Photolithography is a manufacturing technique for controlling precisely micrographics on surface. Here grating-structured, square-structured and hexagon-structured TiO2 films were prepared by photolithography and the effects of various surface structures on photocatalysis were studied. It was demonstrated that the photocatalytic activity of TiO2 film was not always improved as the surface area increased. The micro-patterned surface would also impede the mass transfer in the process of photocatalysis. (C) 2019 Elsevier B.V. All rights reserved

2-[(4-Chloro­phen­yl)(hy­droxy)meth­yl]-5,5-dimethyl-1,3,2-dioxaphosphinan-2-one

In the title compound, C12H16ClO4P, the phospho­nate ring adopts a chair conformation. In the crystal, intermolecular O—H⋯O hydrogen bonds link the molecules into chains propagating along the b axis

(S)-2-[1-(4-Bromo­phen­yl)-1-hy­droxy­ethyl]-5,5-dimethyl-1,3,2-dioxaphos­phinane 2-oxide

In the crystal structure of the title mol­ecule, C13H18BrO4P, the phospho­nate ring adopts a chair conformation. Mol­ecules are linked by an O—H⋯O hydrogen bond [O⋯O = 2.780 (3) Å] to form chains parallel to the c axis. Two C—H⋯O inter­actions help to stabilize the crystal structure