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- 저자 : Zheng Wenyue (검색결과 4 건)
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Li Weiwei,Zheng Wenyue,Ren Lulu,Li Huan,Zhao Xuetong,Wang Can,Li Jianying 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.1
Medium and high voltage XLPE cables were widely used in urban distribution network. The electric-thermal eff ect of the cable conductor and water in the running environment are two important factors that cause ageing of cable insulating material. In this work, accelerated electrical test (AET) and accelerated water tree test (AWTT) on 10 kV XLPE cable were carried out for 1440 h, 2880 h and 4320 h, respectively. The physicochemical and dielectric properties of both aged and unaged XLPE samples were tested. Physicochemical investigation of Fourier Transform Infrared (FTIR) spectroscopy and X-Ray Diff raction (XRD) show that higher carbonyl groups index, and lower crystallinity of the XLPE insulating materials were generated in AWTT process than that in AET process. The thermal decomposition process of the AWTT XLPE are complicated, presenting a multi-peak phenomenon in the diff erential thermogravimetry (DTG) curve. The insulating strength of the samples after AWTT is monotonically decreased from 23.03 kV to 21.74 kV with ageing time. The dielectric properties show that the permittivity and dielectric loss of AWTT samples increased more severely than that of AET samples, with a new dielectric relaxation peak appearing at around 100 Hz. The combination of physicochemical and dielectric results reveals that AWTT process leads to more serious degradation for XLPE insulating materials. A schematic illustration is given to elucidate the development of micro defects in XLPE during the AET and AWTT processes.
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750 GeV diphoton resonance in a vector-like extension of Hill model at a 100 TeV hadron collider
Liu, Ning,Wang, Wenyu,Zhang, Mengchao,Zheng, Rui World Scientific 2016 International Journal of Modern Physics A Vol.31 No.25
<P> In this paper, we study the recent 750 GeV diphoton excess in the Hill model with vector-like fermions. The singlet-like Hill boson is chosen as the 750 GeV diphoton resonance. Such a scalar is mainly produced by gluon fusion via vector-like top and bottom quark loops and decays to diphoton via the vector-like quark and lepton loops. Under the current experimental and theoretical constraints, we find that the mixing angle of the singlet and doublet Higgs bosons lies within [Formula: see text] and the 750 GeV diphoton cross-section can be maximally enhanced to about 6 fb at 13 TeV LHC. Moreover, we find that the Hill boson pair production in [Formula: see text] channel can be probed at [Formula: see text] significance if [Formula: see text] and [Formula: see text] at a 100 TeV collider with 3000 fb[Formula: see text] luminosity. </P>
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Kaiqiang Yu,Li Peng,Wenyu Liang,Jing Shi,Guoqi Zheng,Hong Wang,Xinhua Liang,Shijie Wu 한국식품과학회 2024 Food Science and Biotechnology Vol.33 No.1
Licorice from Glycyrrhiza uralensis roots is used in foods and medicines. Although we are aware that licorice roots and leaves have distinct material compositions, the specific reasons for these differences remain unknown. Comparison of the metabolomes and transcriptomes between the leaves and roots revealed flavonoids and triterpenoid saponins were significantly different. Isoflavones were enriched in roots because of upregulation of genes encoding chalcone isomerase and flavone synthase, which are involved in isoflavone synthesis. Six triterpenoid saponins were significantly enriched only in the roots. The leaves did not accumulate glycyrrhetinic acid because of low expression levels of genes involved in its synthesis. A gene encoding a UDP glycosyltransferase, which likely catalyzes the key step in the transformation of glycyrrhetinic acid to glycyrrhizin, was screened. Our results provide information about the differences in flavonoid and triterpenoid synthesis between roots and leaves, and highlight targets for genetic engineering.
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Integrated Analysis Method of Thin-Walled Turbine Blade Precise Machining
Hui Wang,Lijiang Huang,Chao Yao,Meng Kou,Wenyu Wang,Bohao Huang,Weizhen Zheng 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.
Conventional turbine blade machining technology has to face some challenges on production efficiency, quality and environmental impact. So a new machining technical solution for thin-walled turbine blade is presented. Technical problems associated with the precise machining of turbine blade are discussed in detail. On the basis of analysis with existing demerits, we propose a new fixture optimization and precise machining schema for turbine blade. In the proposed technical methodology, geometric locating tolerance analysis and FEM based structural deformation prediction methods are integrated into one framework to improve the machining performance of thin-walled turbine blade. An automatic machining station of turbine blade is also developed. Promising technical capability of this system is demonstrated and validated by real machining experiments.
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