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Your search keyword '"Chen, B.Q."' showing total 30 results
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30 results on '"Chen, B.Q."'

19. Analysis of a selected sample of RR Lyrae stars in the LMC from OGLE-III

Author

Chen, B.Q., Jiang, R.W., Yang, M., Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213) (UTINAM), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), and Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)

Subjects
galaxies: individual (LMC), stars: variables: other, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Astrophysics::Galaxy Astrophysics
Abstract

International audience; A systematic study of RR Lyrae stars is performed using a selected sample of 655 objects in the Large Magellanic Cloud (LMC) with long-term observations and numerous measurements from the Optical Gravitational Lensing Experiment III project. The phase dispersion method and linear superposition of the harmonic oscillations are used to derive the pulsation frequency and properties of light variation. It is found that a dichotomy exists in Oosterhoff Type I and Oosterhoff Type II for RR Lyrae stars in the LMC. Due to our strict criteria for identifying a frequency, a lower limit for the incidence rate of Blazhko modulation in the LMC is estimated in various subclasses of RR Lyrae stars. For fundamental-mode RR Lyrae stars, the rate of 7.5% is smaller than the previous result. In the case of the first-overtone RR Lyrae variables, the rate of 9.1% is relatively high. In addition to the Blazhko variables, 15 objects are identified to pulsate in the fundamental/first-overtone double mode. Furthermore, four objects show a period ratio around 0.6, which makes them very likely to be rare pulsators in the fundamental/second-overtone double mode.

Published
2013

20. Kinematics and experiments of a life-sized masticatory robot for characterizing food texture

Author

Xu, W.L., Torrance, J.D., Chen, B.Q., Potgieter, J., Bronlund, J.E., Pap, J.-S., and Publica

Abstract

A life-sized masticatory robot, which is intended to chew foods in a human way while the food properties are evaluated, of a 6RSS parallel mechanism is discussed in this paper. A robotic mechanism is proposed, and its kinematic parameters are defined according to the biomechanical findings and measurements of the human masticatory system. For a given mandibular trajectory to be tracked, the closed-form solution to inverse kinematics of the robot is found for joint actuations, whereas differential kinematics is derived in Jacobian matrices. Major features of the robot, including the motion control system, are presented. Experimental results for free chewing, soft-food chewing, and hard-food chewing are given where the foods are simulated by foam and hard objects, and crank actuations and driving torques (an indication of muscular activities) required are compared for the chewing of different foods.

Published
2008

26. Microscopic approach to collective motion

Author

Bonche, P., primary, Chabanat, E., additional, Chen, B.Q., additional, Dobaczewski, J., additional, Flocard, H., additional, Gall, B., additional, Heenen, P.H., additional, Meyer, J., additional, Tajima, N., additional, and Weiss, M.S., additional

Published
1994
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30. Mechanochemical synthesis of ultrafine Ti(C,N)–Al2O3 composite powders and phase transformation

Author

Xiang, D.P., Liu, Y., Tu, M.J., Li, Y.Y., Xia, S., and Chen, B.Q.

Subjects
*MECHANICAL chemistry, *COMPOSITE materials, *PHASE transitions, *NITRIDES, *ALUMINUM oxide, *X-ray diffraction, *THERMAL analysis
Abstract

Abstract: Titanium carbonitride–alumina (Ti(C,N)–Al2O3) composite powders with ultrafine-sized particles below 0.5μm were successfully synthesized by mechanochemical method. That is to say, mixed powders of anatase/aluminum/carbon black were mechanically milled for 40h under N2/Ar atmosphere and were subsequently vacuum heat treated for 1h at 800–1100°C. From X-ray diffraction (XRD) and thermogravimetry–differential scanning calorimetry (TGA–DSC) results of milled powders, Ti(C,N)–Al2O3 phases were formed during mechanical milling and the remained powders completely reacted at lower heat treatment temperature. However, even if starting powders have been heat treated for 1h at 1100°C under N2 atmosphere, one of target products (Ti(C,N)) was not found in heat treatment products. Thus, high-energy mechanical milling has prominent advantages in preparing Ti(C,N)–Al2O3 composite powders through solid–gas reaction between TiO2/Al/C and N2. In addition, phase transformation during mechanochemical synthesis was also analyzed based on experimental results. The processes are as follows: TiO2/Al/C/N2 →Ti n O2n−1(n >3)–Al2O3 →Ti3O5–Al2O3 →Ti(N,O)–Al2O3 →TiN–Al2O3 →Ti(C,N)–Al2O3. [Copyright &y& Elsevier]

Published
2009
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