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RISS 인기검색어
- 검색키워드
- 저자 : Yubin He (검색결과 5 건)
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Viscoelastic analysis of a sleeve based on the BP neural network
Yubin Gao,Haibin Li,Guangmei Wei,Yun He 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.11
Viscoelastic materials are widely used in aviation, underground engineering, chemical engineering, light textile, construction, machineryand shock-absorbing. The properties of viscoelastic materials present strong non-linear characteristics in the time, temperature andfrequency domains. The objective is to explore the possibility of having a rational understanding of the complex response. The neuralnetwork technique is thus implemented for this purpose. This study presents the differential constitutive equations of viscoelastic materialsbased on the generalized Kelvin model. The viscoelastic response Laplace transform equations of the sleeve structure are derivedunder the condition of plane strain according to the boundary conditions of the viscoelastic sleeve. The orthogonal design test results ofviscoelastic numerical calculations are normalized and trained using a three-layer BP neural network. The trained network can easilyrealize the mapping of the viscoelastic material test set. Simulation results show that the neural network test and numerical solution resultsare close to each other, and the maximum error of all variables is less than 2.8 percent. The results obtained in this research revealthat the neural network technique has a suitable capability in establishing correlations among different loads and corresponding viscoelasticresponses. The developed neural network model can effectively solve the non-linear problems of viscoelastic structures.
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Investigation on a W Band Ridge-Loaded Folded Waveguide TWT
Jun He,Yanyu Wei,Yubin Gong,Wenxiang Wang,Gun-Sik Park IEEE 2011 IEEE transactions on plasma science Vol.39 No.8
<P>A W-band ridge-loaded folded waveguide traveling-wave tube (FWTWT) is modeled, and the nonlinear interaction between the electron beam and the electromagnetic field is investigated by utilizing a 3-D particle-in-cell (PIC) code, MAGIC. The process of beam-wave interaction for millimeter wave TWT is presented, including the longitudinal momentum of the electron, the averaged radiation power, and the influence of input power on output power. Compared with the conventional FWTWT at 95 GHz, the ridge-loaded FWTWT obtains a 29.3% higher output power and shortens 31.7% interaction distance. The radiation power and the gain of TWT are raised up in most of the working band covering from 85 to 97 GHz, indicating effectual enhancement of beam-wave interaction by loading ridge. Furthermore, the novel FWTWT works in 7-GHz bandwidth with output power varying only 1 dB throughout the band.</P>
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magnetostratigraphy, 26Al-10Be, Yx02 borehole, tectonic evolution, Daxing Uplift, Beijing Sub-plain
Fubing He,Xiwei Xu,Fang Tian,Zhenhua Liu,Yueze Zhang,Lingyan Bai,Yubin Cui,Kai Wang,Wenzhi Niu,Jingbo Ni,Xiaoyong Liu,Mengmeng Cao 한국지질과학협의회 2024 Geosciences Journal Vol.28 No.2
The buried Daxing Uplift connects the Beijing Sag and Dachang Sag, which is the critical tectonic unit for understanding the structural evolution of the Beijing Sub-plain and its linkages to regional tectonics. This study combines paleomagnetic, 26Al-10Be isochron dates and sedimentary analyses from a new borehole (Yx02) in the northeastern Beijing Sub-plain to shed fresh light on regional tectonic processes and the sedimentary history since the Pliocene. The main findings are as follows: (1) the Daxing Uplift had formed three depositional episodes: alluvial-fan, lacustrine-delta, and alluvial-fan sedimentation since the Cenozoic; (2) The borehole records the Brunhes, Gauss normal chron, and the Matuyama, Gilbert reversed chron in the Daxing Uplift, the corresponding depths are 0–148.9 m, 148.9–315.0 m, 315.0–520.5 m and 520.5–650 m; (3) An important tectonic event started in ~4.3 Ma, disintegrated NE-trending basin and range terrain, reactivated the NW-trending Nankou-Sunhe fault, and formed Shunyi fault in Beijing Sub-plain. Sedimentation occurs exclusively in the Beijing Sag and the northeastern Daxing Uplift during ~4.3–1.77 Ma; (4) During ~1.77–1.07 Ma, a transition from an extension to a strike-slip occurred, and is described not only in a progressively higher increase of the overall deposition rate, but also in a decrease of the relative deposition disparity between sags and uplifts. Since then, the Beijing Sub-plain has been shaped, associated with an overall subsidence depression in the Bohai Bay Basin. This work enhances our understanding of the formation and evolution of the Beijing Sub-plain, the division of tectonic episodes, and the initiation time of the latest tectonic movement in the break-up region, North China Craton, since the Neogene.
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A Rectangular Groove-Loaded Folded Waveguide for Millimeter-Wave Traveling-Wave Tubes
Mingliang Liao,Yanyu Wei,Yubin Gong,Jun He,Wenxiang Wang,Gun-Sik Park IEEE 2010 IEEE transactions on plasma science Vol.38 No.7
<P>A folded waveguide (FW) is a promising slow-wave structure (SWS) for millimeter-wave traveling-wave tubes (TWTs) with the advantages of high power and considerable bandwidth. A novel rectangular groove-loaded FW SWS is analyzed for the purpose of gaining higher power with a smaller size compared with the normal circuit. The high-frequency characteristics, including dispersion properties and interaction impedance, are investigated by numerical simulation, and the nonlinear large-signal performance of such a TWT is also analyzed by a 3-D particle-in-cell code MAGIC3D. Compared with a normal circuit, larger gain and electronic efficiency together with notably higher output power at a Ka-band are predicted by the simulation. Meanwhile, the novel circuit is also much shorter than the normal circuit with good performance at the working frequencies. It, therefore, will favor the miniaturized design of a high-power millimeter-wave TWT.</P>
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Anti-Inflammatory Activity of Phenylethanoids from Acanthus ilicifolius var. xiamenensis
Yifan Zhang,Jinhuang Shen,Xinhua Ma,Yubin He,Yonghong Zhang,Dairong Cao 한국식품영양과학회 2023 Journal of medicinal food Vol.26 No.2
Acanthus ilicifolius var. xiamenensis is a traditional herbal medicine in China. In this study, the anti-inflammatory activities of active ingredients of A. ilicifolius var. xiamenensis were investigated in RAW 264.7 cells and Freund's complete adjuvant-induced arthritic rats. Results showed that n-butanol extract exerted antiarthritic potential by reducing paw edema, arthritis score, and altered hematological and biochemical parameters in experimental rats. Phytochemical studies on n-butanol extract resulted in the isolation of five alkaloids (1–5) and five phenylethanoids (6–10). The anti-inflammatory assay of compounds 1–10 on lipopolysaccharide (LPS)-treated RAW 264.7 cells indicated that phenylethanoids 9 and 10 exhibited notable inhibitory activities. The result indicated that compounds 9 and 10 attenuated inflammation by decreasing the production of nuclear factor kappa-B (NF-κB) p65, inhibitory subunit of NF kappa B alpha, Janus kinase 2 (JAK2), signal transducer and activator of transcription 3 (STAT3), and inducible nitric oxide synthase in LPS-mediated RAW 264.7 macrophages. Phenylethanoids 9 and 10 increased the expression of interleukin-10 and endothelial nitric oxide synthase. Therefore, compounds 9 and 10 showed anti-inflammatory activity by regulation of NF-κB and JAK/STAT signaling pathways.
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