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RISS 인기검색어
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- 저자 : Fengzhang Ren (검색결과 4 건)
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Recoating slurry process effects on the SiC-based casting foam filter properties
Fengzhang Ren,Gangjun Zhai,Zhanhong Ma,Alex A. Volinsky,Baohong Tian 한양대학교 세라믹연구소 2014 Journal of Ceramic Processing Research Vol.15 No.2
Polyurethane foam was used as a precursor for fabricating SiC-based ceramic foam filters. Two recoating slurry processes were adopted to enhance the strength of ceramic foam. One was the recoating slurry of stoved green body and another was the recoating slurry of pre-sintered green body. The differences in weight increase and thermal shock resistance of ceramic foams fabricated by the two recoating slurry processes were investigated. The effects of pre-sintering temperature on weight increase and thermal shock resistance are discussed. Thermal shock resistance of ceramic foams fabricated by two recoating slurry processes is lower than that by the single coating slurry process. Compared with recoating slurry of pre-sintered green bodies, with the same slurry, the weight increase of ceramic foams fabricated by recoating slurry of the stoved green bodies is less, but the number of thermal cycles to failure is much higher. For ceramic foams fabricated by recoating slurry of presintered green bodies with the same slurry, the weight increase and the number of thermal cycles to failure decreased with the pre-sintering temperature.
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Microstructure and quality of SiC foam filters for casting
Fengzhang Ren,Gangjun Zhai,Zhanhong Ma,Xiaobo Chen,Alex A. Volinsky 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.6
Maximum compressive strain at high temperature was introduced as a new quality indicator of ceramic foam filters used in metal casting. Maximum compressive strain at high temperature, number of thermal cycles before failure, room temperature compressive strength and bulk density of SiC-based ceramic foam filters with the same pore size produced by four manufacturers were measured. The best quality product exhibited the highest number of thermal cycles before failure and minimum strain at high temperature. Differences in properties were elucidated based on X-ray diffraction and scanning electron microscope microstructural characterization. The best quality filter has less glass phase and more quartz phase, while lower quality filters have more glass and cristobalite phases. The glass phase increases the maximum strain at high temperature, while both glass and cristobalite phases reduce the number of thermal cycles before failure. The maximum compressive strain at high temperature can be utilized as the main indicator for evaluating the quality of ceramic foam filters.
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Fano Interference in a Parallel Double Quantum Dot Interferometer Modified by the Decoherence Effect
Chuan-Jing Yang,Fengzhang Ren,Wei-Jiang Gong 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.6
By introducing floating leads to mimic the decoherence mechanism, we study the influence of thedecoherence effect on the Fano interference in electron transport through a parallel double quantumdot (QD) structure. We find that when the decoherence effect is incorporated in the resonantchannel, the Fano interference can apparently be suppressed, especially in the case of Φ= (Φis the phase due to the presence of a local magnetic flux). On the other hand, if the decoherenceeffect is introduced into the nonresonant channel, the Fano antiresonance is independent of thestrengthening of the decoherence effect. If the magnetic flux is absent, the Fano antiresonancevalley will be widened by the decoherence. When Φ= , the Fano lineshape in the conductancespectrum is robust. By analyzing the electron motion is this system, we clarified all the results. Wehope that these results will be helpful for relevant experiments.
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Feng Zhang,Guang Ren Duan 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.5
This paper tackles the problem of integrated translation and rotation stabilization of the spacecraft in proximity operations by proposing a novel manipulator actuation strategy. To do so, by theoretically integrating the attitude/position motion of the spacecraft and the joint motion of the manipulator, a coupled translational and rotational kinematics of the spacecraft with a single space manipulator mounted is formulated, where system unknown parameters and residual system momentum are taken into account and analyzed. Taking the joint motion as the control input, a projection-based adaptive control scheme is then developed such that the translation and rotation of the spacecraft can be robustly stabilized with the manipulator-based actuation. The closed-loop asymptotic stability is guaranteed within Lyapunov framework. Meanwhile, considering the constrained joint motion of the manipulator, the resulting control constraint issue is handled by developing an optimization based bound analysis method, which also facilitates the determination of control parameters. Two scenario numerical simulations demonstrate the effect of the designed control scheme.
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