http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Jianyong Yao,Zongxia Jiao,Bin Yao 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.4
High performance robust force control of hydraulic load simulator with constant but unknown hydraulic parameters is considered. Incontrast to the linear control based on hydraulic linearization equations, hydraulic inherent nonlinear properties and uncertainties makethe conventional feedback proportional-integral-derivative (PID) control not yield to high performance requirements. Furthermore, thehydraulic system may be subjected to non-smooth and discontinuous nonlinearities due to the directional change of valve opening. In thispaper, based on a nonlinear system model of hydraulic load simulator, a discontinuous projection-based nonlinear adaptive robust backsteppingcontroller is developed with servo valve dynamics. The proposed controller constructs a novel stable adaptive controller andadaptation laws with additional pressure dynamic related unknown parameters, which can compensate for the system nonlinearities anduncertain parameters, meanwhile a well-designed robust controller is also synthesized to dominate the model uncertainties coming fromboth parametric uncertainties and uncertain nonlinearities including unmodeled and ignored system dynamics. The controller theoreticallyguarantee a prescribed transient performance and final tracking accuracy in presence of both parametric uncertainties and uncertainnonlinearities; while achieving asymptotic output tracking in the absence of unstructured uncertainties. The implementation issues arealso discussed for controller simplification. Some comparative results are obtained to verify the high-performance nature of the proposedcontroller.
Jianyong Zhao,Jian Li,Heng Nian,Lei Yang,Bao Gai,Zaiping Pan,Yourui Xu 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
Due to the unmatched feeder impedance, the conventional voltage and frequency droop control method is unable to accurately allocate the output reactive power of DG units in proportion to their power ratings. To solve this issue, this paper has proposed a feeder impedance identification based droop control method. Firstly, the relationship among the reactive power sharing, reactive power droop slope and feeder impedance in islanded microgrids is illustrated. An online feeder impedance identification method is subsequently adopted to modify the reactive power droop slope of DG unit. In this way, the effect of unmatched feeder impedance on reactive power sharing is eliminated without communication among DG units. Experimental results implemented on an islanded microgrid apparatus have validated the feasibility of the proposed droop control method.
Passivation Layer of CdZnTe as Studied by Spectroscopic Ellipsometry
Jianyong Teng,Wenbin Sang,Yue Lu,Yanyan Lou,Jiahua Min,Xiaoyan Liang,Kaifeng Qin,Yongbiao Qian 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
An oxidized layer was obtained on a cadmium zinc telluride (CZT) wafer by using chemical etching first in a KOH-KCl solution and then in an NH4F/H2O2 solution. The oxidized layer on the CZT obtained by using this method was analyzed by using ex-situ spectroscopic ellipsometry (SE) for the first time. In particular, the optical constants and the thickness of the chemical oxidized layer were obtained as functions of the oxidizing time.
Jianyong Zheng,Yi Pan,Fei Mei,Huiyu Miao,Kedong Zhu,Haoyuan Sha 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.1
Traditional fault diagnosis for a high-voltage circuit breaker (HVCB) encounters the following problems: the fault features extracted by traditional shallow models is of weak expression ability, and the accuracy of fault identification can be affected by the lack of labeled training samples. To overcome these problems, we present a new approach for HVCB mechanical fault diagnosis based on a deep belief network (DBN) and a transfer learning strategy. This approach uses a DBN to achieve the deep mining and adaptive extraction of the inherent features of sample data, and combines the transfer learning method to improve the accuracy of the fault diagnosis model, which uses a large amount of selective auxiliary data to augment the tiny amount of target data learning by adjusting the weight of training samples. The target sample data are obtained by collecting the coil current signal of the HVCB from fault simulation experiments, and the auxiliary sample data are obtained through simulation based on the electromagnetic system mathematical model of the HVCB spring mechanism. The experimental results show that compared with the traditional feature extraction and fault diagnosis method, the DBN approach combined with transfer learning can achieve stronger feature learning and generalization ability
In uence of In dopant on PL Spectra of CdZnTe Crystals
Jianyong Teng,Wenbin Sang,Gang Li,Zhubin Shi,Jiahua Min,Dongni Hu,Yongbiao Qian 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.1
Photoluminescence (PL) spectra are used to characterize the high resistivity of an In-doped CdZnTe (CZT) crystal. The features of the PL spectra vary with changing In-dopant concentration, indicating that the In-dopant concentration has a great impact on the defect type and density and on the extent of compensation in the In-doped CZT crystal. With the addition of In donors, a new sharp neutral donor bound exciton [D0, X] peak at 1.65 eV, corresponding to In substituting defect (In+ Cd) and a new defect complex band centered at 1.505 eV, related to the singly negative complex (VCd-InCd)- are observed. Meanwhile, the intensity and position of the feature peaks in PL spectra vary with the change of the In dopant concentration, representing the changes of the defect type and density and the extent of compensation in the crystal. It conrms that the Cd vacancy or residual impurity acceptors are dominantly compensated by In donors. The measured conduction type and carrier densities are the results of compensation between Cd vacancies and In donors and Te antisites, which are related to the In-dopant concentration and the stoichiometry for the CZT crystal. Photoluminescence (PL) spectra are used to characterize the high resistivity of an In-doped CdZnTe (CZT) crystal. The features of the PL spectra vary with changing In-dopant concentration, indicating that the In-dopant concentration has a great impact on the defect type and density and on the extent of compensation in the In-doped CZT crystal. With the addition of In donors, a new sharp neutral donor bound exciton [D0, X] peak at 1.65 eV, corresponding to In substituting defect (In+ Cd) and a new defect complex band centered at 1.505 eV, related to the singly negative complex (VCd-InCd)- are observed. Meanwhile, the intensity and position of the feature peaks in PL spectra vary with the change of the In dopant concentration, representing the changes of the defect type and density and the extent of compensation in the crystal. It conrms that the Cd vacancy or residual impurity acceptors are dominantly compensated by In donors. The measured conduction type and carrier densities are the results of compensation between Cd vacancies and In donors and Te antisites, which are related to the In-dopant concentration and the stoichiometry for the CZT crystal.
Multi-scale Nano/Micro Fiber Scaffolds with Different Topological Morphologies
Jianyong Feng,Ruixiang Xu,Jiaming Zhao,Lingxiao Zhang 한국섬유공학회 2022 Fibers and polymers Vol.23 No.4
The multi-scale fiber and topological morphologies had been shown to influence cell mitogenesis and chemotaxis,direct cell differentiation, and induce constructive host tissue remodeling responses. To simulate multi-layer meshworkarchitecture of extracellular matrix and regulate cell behavior, we prepared different topological scaffolds, such as 3Dprinting fiber scaffolds, poly(lactic acid) (PLA) electrospun fiber scaffolds, 3D printing/knitted fabric composite scaffolds,and PLA electrospinning/knitted fabric composite scaffolds. The surface morphology, pore diameter, thickness, stress-straincurve, electrical current, and other properties were studied. The aim is to prepare multi-scale nano/micro fiber scaffolds withdifferent topological morphologies and properties that can provide structural and mechanical support for potential tissueengineering applications.
Li, Jianyong,Kakemoto, Hirofumi,Wada, Satoshi,Tsurumi, Takaaki Trans Tech Publications, Ltd. 2006 Key Engineering Materials Vol.301 No.-
<P>A new measuring method and analyzing procedure were proposed to determine the complex dielectric permittivity of materials with relatively high permittivity using an RF-impedance analyzer. Samples used for the measurement were (Ba0.6Sr0.4)TiO3 and Ba(Zr0.25Ti0.75)O3 ceramics. Micro planar electrodes were used for the measurement of complex admittance of these samples. Electromagnetic simulations were carried out for determining the relative dielectric permittivity and dielectric loss. The complex dielectric permittivity vs. frequency curves of Ba(Zr0.25Ti0.75)O3 showed a broad dielectric relaxation, while that of (Ba0.6Sr0.4)TiO3 was almost flat up to 3 GHz.</P>