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- 저자 : Huadong Tang (검색결과 3 건)
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Design of the State Monitoring System of Power Cable Outer Sheath Based on the DigiMeshi Network
Huadong Peng,Chao Tang,Qian Wang,Yan Yang 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.5
With the development of power grid intellectualization, real-time state monitoring of power cable outer sheath is becoming more and more important. Monitoring and test of the cable outer sheath currently being used are time consuming and inflexible. To this point, a DigiMesh network based wireless monitoring solution is proposed in this article. The sensor node is mainly composed of main control chip Msp430F169 and XTend module based on DigiMesh network. It is being used to receive, store and transmit the collected data and information, and pass back the outer sheath state monitoring data through multiple hop transmission. During this process, the multi-channel and multi-data source parallel transmission mechanism is applied to reduce the route hop number and lower the network load. The proposed solution was experimental simulated, which proved to be practical and had a good real-time performance. This solution is also applicable to state monitoring of cable outer sheath in areas which are not covered by telecom signals, and it is helpful to discover and handle the cable line fault and reduce safety hazards.
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Polymerization of Vinyl Acetate Initiated by Hydrosilane in the Presence of Platinum Complex
Ming Yuan,Wenxian Zhu,Jiaxing Lv,Panpan Zhang,Huadong Tang 한국고분자학회 2021 폴리머 Vol.45 No.3
In this work, a series of hydrosilanes including phenylsilane, diphenylsilane, triethylsilane (TES), and tris(trimethylsilyl)silane combined with catalytical amount of platinum complex such as dichloro(1,5-cyclooctadiene) platinum (COD) and dichloro(dicyclopentadienyl)platinum have been used to initiate the polymerization of vinyl acetate (VAc) at 70-95 ℃. An ultrahigh molecular weight PVAc with number-average molecular weight (Mn) up to 1.17×10<SUP>6</SUP> Da and polydispersity index (PDI) of 2.59 has been synthesized using TES as an initiator in the presence of 9.7 ppm of COD. A kinetic study indicates that the polymerization at VAc/TES/COD molar ratio = 3.0×10<SUP>5</SUP> : 60 : 1 smoothly reached 81.0% conversion in 28.0 h at 85 ℃, producing PVAc with Mn increasing linearly from 1.41×105 to 6.01×10<SUP>5</SUP> Da with the increase of monomer conversion. A mechanistic investigation revealed that COD was firstly reduced by reductive TES, producing Pt nanoparticles and corresponding silane radicals to initiate the polymerization of VAc.
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Shuai Ye,Shuyang Dong,Jun Tan,Le Chen,Hai Yang,Yang Chen,Zeyan Peng,Yingchao Huo,Juan Liu,Mingshan Tang,Yafei Li,Huadong Zhou,Yong Tao 대한신경과학회 2019 Journal of Clinical Neurology Vol.15 No.1
Background and Purpose This study investigated the contribution of white-matter hyperintensities (WMH) and lacunar infarcts (LI) to the risk of Alzheimer’s disease (AD) in an elderly cohort in China. Methods Older adults who were initially cognitively normal were examined with MRI at baseline, and followed for 5 years. WMH were classified as mild, moderate, or severe, and LI were classified into a few LI (1 to 3) or many LI (≥4). Cognitive function was assessed using the Mini Mental State Examination and the Activities of Daily Living scale. Results Among the 2,626 subjects, 357 developed AD by the end of the 5-year follow-up period. After adjusting for age and other potential confounders, having only WMH, having only LI, and having both WMH and LI were associated with an increased risk of developing AD compared with having neither WMH nor LI. Moderate and severe WMH were associated with an increased risk of developing AD compared with no WMH. Furthermore, patients with many LI had an increased risk of developing AD compared with no LI. Conclusions Having moderate or severe WMH and many LI were associated with an increased risk of developing AD, with this being particularly striking when both WMH and LI were present.
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