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Speed Sensorless Control of a Bearingless Induction Motor Based on Modified Robust Kalman Filter
Bian Yifan,Yang Zebin,Sun Xiaodong,Wang Xiang 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.3
To enhance the speed identifcation accuracy in speed sensorless control of a bearingless induction motor (BIM), a speed sensorless control strategy based on modifed robust Kalman flter is proposed. Firstly, the suboptimal principle of the H∞ control method is introduced into the extended Kalman flter to construct the robust Kalman flter. Secondly, the rotor fux linkage of the BIM in the α-β coordinate system is discretized, which is used as a reference model and adjustable model in the model reference adaptive system. At the same time, the modifed robust Kalman flter is obtained by combining the robust Kalman flter with the model reference adaptive system. Finally, the simulation and experimental results show that the proposed BIM speed sensorless control system based on modifed robust Kalman flter has higher accuracy of speed identifcation than the extended Kalman flter control under diferent operation conditions of no-load, sudden load, speed change, and motor parameter mismatch. The motor also has a good suspension performance.
Bian, L.,Chung, H.J. IRL Press 2016 Food hydrocolloids Vol.60 No.-
<P>The impact of single and dual hydrothermal treatments on the molecular structure, crystalline structure, in vitro digestibility, and physicochemical properties of starches isolated from hydrothermally treated brown rice flour was investigated. Annealed rice starch (ANN) exhibited no significant change in molecular structure, whereas heat-moisture treated rice starch (HMT) showed decreased apparent amylose content, molecular weight of amylopectin, average chain length of amylopectin, and long amylopectin branch chains (DP >=> 37). The relative crystallinity, intensity ratio of 1045 cm(-1)-1015 cm(-1), and gelatinization enthalpy remained unchanged in ANN, but significantly decreased in HMT. In dually modified starches, the HMT-ANN had higher gelatinization temperatures, gelatinization enthalpy, relative crystallinity and ratio of 1045 cm(-1)-1015 cm(-1) than the ANN-HMT. Hydrothermal treatment substantially increased starch digestibility in the granular state, showing increased rapidly digestible starch (RDS) content and decreased resistant starch (RS) content. However, in the gelatinized starches, ANN and HMT showed decreased RDS level and increased slowly digestible starch (SDS) and RS levels. The changes in amounts of RDS, SDS, and RS in ANN, HMT and dually modified starches could be attributed to the alteration of crystalline and molecular structures. (C) 2016 Elsevier Ltd. All rights reserved.</P>
CP violation effects in the diphoton spectrum of heavy scalars
Bian, Ligong,Chen, Ning,Zhang, Yongchao American Physical Society 2017 Physical Review D Vol.96 No.9
<P>In a class of new physics models, an extended Higgs sector and new CP-violating sources are simultaneously present in order to explain the baryon asymmetry in the Universe. The aim of this work is to study the implications of beyond the Standard Model (SM) CP violation for the searches of heavy scalars at the LHC. In particular, we focus on the diphoton channel searches in the CP-violating two-Higgs-doublet model (CPV 2HDM). To have a sizable CPV in the scalar sector, the two heavy neutral scalars in 2HDM tend to be nearly degenerate. The theoretical constraints of unitarity, perturbativity and vacuum stability are considered, which requires that the heavy scalars M-H less than or similar to 1 TeV in a large region of the parameter space. The experimental limits are also taken into account, including the direct searches for heavy neutral scalars in the final state of the SM h, W and Z bosons; the differential (tt) over bar data; those from the charged scalar sector which is implied by the oblique T parameter; and the precise measurements of the electric dipole moments of electrons and mercury. The quantum interference effects between the resonances and the SM background are crucially important for the diphoton signals, and the CPV mixing of the quasidegenerate heavy scalars could enhance significantly the resonance peak. With an integrated luminosity of 3000 fb(-1) at the LHC, almost the whole parameter space of CPV 2HDM could be probed in the diphoton channel, and the CPV could also be directly detected via the diphoton spectrum.</P>
Anti-dumping Laws and Oligopolistic Trade
Bian, Jiang,Gaudet, Ge´rard 세종대학교 국제경제연구소 1997 Journal of Economic Integration Vol.12 No.1
We study the effect of anti-dumping laws in a differentiated products quantity-setting oligopoly. Dumping may or may not occur in the model and may or may not be reciprocal. We show that the effect of adopting an anti-dumping policy on the welfare of the importing country is ambiguous. It can even lead to an increase in the consumers' surplus in the importing country. Hence the importing country may in some cases find strong reasons for the adoption of an anti-dumping policy. We then study the endogenous determination of the equilibrium anti-dumping policies in a two-stage game with reciprocal dumping in which the two governments simultaneously choose anti-dumping policies in a first stage. We provide a sufficient condition, relating the degree of substitutability in demand between the two goods and transport cost, in order for each country to have an incentive to deviate unilaterally from free trade in the presence of anti-dumping laws. We show that governments acting cooperatively to maximize world welfare should choose to endorse the institution of anti-dumping law.(JEL Classification: F12, F13, L13)
Future prospects of mass-degenerate Higgs bosons in the CP -conserving two-Higgs-doublet model
Bian, Ligong,Chen, Ning,Su, Wei,Wu, Yongcheng,Zhang, Yu American Physical Society 2018 Physical Review D Vol.97 No.11
<P>The scenario of two mass-degenerate Higgs bosons within the general two-Higgs-doublet model (2HDM) is revisited. We focus on the global picture when two CP-even Higgs bosons of h and H are nearly mass-degenerate. A global fit to the signal strength of the 125 GeV Higgs measured at the LHC is performed. Based on the best-fit result of the 2HDM mixing angles (alpha, beta), theoretical constraints, charged and CP-odd Higgs boson direct search constraints and the electroweak precision constraints are imposed to the 2HDM parameter space. We present the signal predictions of the (4b, 2b2 gamma) channels for the benchmark models at the LHC 14 TeV runs. We also study the direct Higgs boson pair productions at the LHC, and the Z-associated Higgs boson pair production search at the ILC 500 GeV runs, as well as the indirect probes at the CEPC 250 GeV run. We find that the massdegenerate Higgs boson scenario in the Type-II 2HDM can be fully probed by these future experimental searches.</P>