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Failure Recovery Dependency Analysis for Web Composition Transactions Based on Extended Petri-Nets
Mei Xiaoyong,Huang Changqin,Tang Yong,Zhao Gansen,Wang Huijin 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.4
For transactional Composition Web Services (CWS), traditional transaction theory in the database is introduced into the Long Running Transactions (LRTs) domain. In practical application, the typical LRTs employ forward or backward rollback. In order to improve the expansibility of LRTs, it is important to accurately specify the dependency between tasks in composition transaction; contemporary technologies usually statically specify dependency point and avoid implicit interaction in LRTs. In this paper, we propose a task dependency modeling method for LRTs, firstly we present formal description of atomic Web Services (WS) and discuss atomic WS such as pivot, compensable, retriable and vital, then execution logs of LRTs data dependency and action dependency rules between tasks in LRTs are analyzed, specify, finally application of TRP shows that it is feasible to ensure consistent execution of reliable LRTs based dependencies.
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Study on the structure of reduced graphene oxide prepared by different reduction methods
Xiang Xu,Zhu Ying,Gao Changqin,Du Han,Guo Chunwen 한국탄소학회 2022 Carbon Letters Vol.32 No.2
The reduced graphene oxide (rGO) has attracted more and more attention in recent years. How to choose a suitable reduction method to prepare rGO is a critical problem in the preparation of graphene composites. In this work, the differences of rGO reduced by thermal, microwave, Ultraviolet (UV) and reducing agent were studied. The reduction degree and functional groups of rGO were compared by SEM, XPS, Raman, FTIR and TGA. Thermal can remove most of the oxygen-containing groups of graphene oxide (GO) and the thermal reduction is the most effective reduction method. UV light can directly act on the unstable oxygen-containing groups, and its reduction efficiency is second only to thermal reduction. The efficiency of chemical reduction is not as good as that of UV reduction, because the reducing agent only act on the surface of GO. Microwave reduction is a mild thermal reduction with the lowest efficiency, but the residual oxygen-containing groups increase the hydrophilicity of rGO. To sum up, this work studies that rGO prepared by different reduction methods has different characteristics, which provides a reference for selecting appropriate reduction methods to prepare graphene composites with better properties.
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Influence of FeSe doping on superconducting properties of MgB2 by hybrid microwave method
Cheng Cheng,Zhenjie Feng,Qing Li,Xu Wang,Chuan Yu,Hao Chu,Ya Yang,Changqin Liu,Yiming Cao,Zhe Li,Jingzhe Chen,Chao Jing,Shixun Cao,Jincang Zhang 한국물리학회 2017 Current Applied Physics Vol.17 No.11
The effect of FeSe doping on the physical properties of MgB2 is studied. Bulk samples of the FeSe doped MgB2 with weight ratio x ðFeSe : MgB2Þ ¼ 0%; 3%; 7% and 10% were prepared by hybrid microwave method. It is proved that FeSe is not stable together with MgB2. Fe2þ enters into MgB2 lattice, some Mg2þ and Se2『 are combined into the new impurity compound MgSe. The superconducting transition temperature (Tc) slightly decreased with increasing doping content of FeSe from R-T and M-T curves, which results from the substitution of Mg2þ by Fe2þ in the MgB2 lattice. The Jc increase slightly with the FeSe doping content increasing from 3 wt % to 10 wt %, which results from the increasing MgSe impurity pinning centers.
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