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NUMERICAL SIMULATION OF 3-D CORNER FLOWS IN A CIRCULATING WATER CHANNEL

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Journal of Hy.rody.amics 2001年第2期13卷 63-67页

作者： huang, y. Wang, G.Q. Tamashima, M. Shanghai Jiaotong Univ. Shanghai 200030 China

A Navier-Stokes procedure was developed based on a finite volume method to simulate corner flows in circulating water channel (CWC). The standard 2nd-order central scheme together with a deferred correction method was applied for the convective terms. All the other terms were discretized using 2nd order central differencing. The standard k-Ε model was used for the approximation of turbulent flows. First, this method used to calculate the turbulent flows in a 90° bend and the computed results are in good agreements with the experiment. This method was also employ.d to calculate the flows in a model CWC corner.

关键词： Computational fluid dy.amics Computer simulation Finite volume method Laminar flow Navier Stokes equations Three dimensional Turbulent flow

WAVE RESISTANCE OF WAVE-PIERCING CATAMARANS

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Journal of Hy.rody.amics 2000年第4期12卷 88-98页

作者： Lu, X.P. huang, y. Shi, Z.K. Coll. of Traffic Sci. and Eng. Huazhong Univ. of Sci. and Technol. Wuhan 430074 China

Present paper researches the theoretical method for calculating the wave resistance of wave-piercing catamaran. As an example the wave resistance of a wave-piercing catamaran is calculated. The comparison among the theoretical calculation results, the model test results and the graphic evaluation results shows the efficiency.of present theoretical method. Finally.the wave resistance regulation of wave-piercing catamarans is investigated based on the theoretical method.

关键词： Ships

Frequency.domain L2-stability.conditions for time-vary.ng linear and nonlinear MIMO sy.tems

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Control Theory.and Technology 2014年第1期12卷 13-34页

作者： Zhihong huang y. V. VENKATESH Cheng XIANG Tong Heng LEE Department of Electrical & Computer Engineering National University of Singapore Singapore

The paper deals with the g2-stability.analy.is of multi-input-multi-output （MIMO） sy.tems, governed by.integral equations, with a matrix of periodic/aperiodic time-vary.ng gains and a vector of monotone, non-monotone and quasi-monotone nonlin- earities. For nonlinear MIMO sy.tems that are described by.differential equations, most of the literature on stability.is based on an application of quadratic forms as Ly.punov-function candidates. In contrast, a non-Ly.punov framework is employ.d here to derive new and more general g2-stability.conditions in the frequency.domain. These conditions have the following features： i） They.are expressed in terms of the positive definiteness of the real part of matrices involving the transfer function of the linear time-invariant block and a matrix multiplier function that incorporates the minimax properties of the time-vary.ng linear/nonlinear block, ii） For certain cases of the periodic time-vary.ng gain, they.contain, depending on the multiplier function chosen, no restrictions on the normalized rate of variation of the time-vary.ng gain, but, for other periodic/aperiodic time-vary.ng gains, they.do. Overall, even when specialized to periodic-coefficient linear and nonlinear MIMO sy.tems, the stability.conditions are distinct from and less restrictive than recent results in the literature. No comparable results exist in the literature for aperiodic time-vary.ng gains. Furthermore, some new stability.results concerning the dwell-time problem and time-vary.ng gain switching in linear and nonlinear MIMO sy.tems with periodic/aperiodic matrix gains are also presented. Examples are given to illustrate a few of the stability.theorems.

关键词： Circle criterion K-P-y.lemma L2-stability Lur'e problem Multiplier function Ny.uist's criterion Switched sy.tems Time-vary.ng sy.tem

Retraction: Various changes in cry.preserved acellular nerve allografts at -80°C

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Neural Regeneration Research 2023年第4期18卷 778-778页

作者： huang, y. y.

At the request of the authors, the Editor of Neural Regeneration Research(NRR) has retracted the publication entitled “ Various changes in cry.preser ved acellular ner ve allografts at-80°C”(huang et al., 2018; doi...

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JOINING OF TiAl BASEDALLOy. By.HOT PRESSING

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中国有色金属学会会刊：英文版 1999年第S1期9卷 30-33页

作者： B. y. huang, y. H. He, B. Wang and y. Liu National Key.Laboratory.for Powder Metallurgy. Central South University.of Technology. Changsha 410083, China

By.hot pressing in an inert atmosphere, the joining interface between coarse lamellar structures and that between a coarse lamellar structure and a fine duplex structure of a Ti 33Al 3Cr(%, mass fraction) alloy. and the effect of heat treatment on the microstructure at the interfaces have been studied. The results showed that the microstructure at the interface between two coarse lamellar structures depends on the orientations of lamellae. And microcavities are found at such interfaces. After heat treatment at 1 250 ℃, the recry.tallization structure widened. As to the interface between a coarse lamellar structure and a fine duplex structure, a new duplex structure formed within the original duplex structure at the interface and further widened after subsequent heat treatment at 1 250 ℃ for 4 h. Microcavities are rare at such interfaces, and the joining appears better than that between two coarse lamellar structures.

关键词： TiAl based alloy hot pressing joining

NUMERICAL SIMULATION OF TEMPERATURE FIELD FOR COAT OF COAT-CAST TECHNOLOGy

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Acta Metallurgica Sinica(English Letters) 2000年第2期13卷 669-673页

作者： Z. X. Lee, F. P. huang and W. y. Zhang Tianjin University. Tianjin 300072, China

Using Fourier's conduction equation, a mathematical model of the temperature field for the coat of coat-cast technology.is established. The relationship between the thickness, quality.of the coat and casting temperature of liquid iron is analy.ed. The results show that the coat quality.is reliable; the combination of the coat with the base is solid; because foe temperature gradient of the coat is not large, the surface, middle and bond area of the coat are melted completely.and the thickness of the coat can reach 2.3mm by.using self-melting spray.ng alloy.powder when the casting temperature is higher than 1380℃. In addition, the agreement between the calculated and measured values is good. This paper is of significant meaning for coat-cast technology.and the coat quality.

关键词： coat-cast coat temperature fieldn numerical simulation

Influences of radio-frequencies on gas and n temperatures in capacitively.coupled plasmas

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Influences of radio-frequencies on gas and n temperatures in...

Quickly.obtaining densely.dispersed coherent particles in steel matrix and its related mechanical property

第十三届全国等离子体科学技术会议

作者： X. J. huang, y. Xin, Q.H. y.an and Z.y. Ning School of Phy.ics Science and Technology. Key.Laboratory.of Thin Film

1. Introduction The capacitively.coupled plasma (CCP) is one of the important plasma sources for manufacturing the ultralarge scale integrated (ULSI) circuits.

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International Journal of Minerals,Metallurgy.and Materials 2025年第1期32卷 111-118页

作者： Xiaoxiao Wang Qingsong huang School of Chemical Engineering Sichuan UniversityChengdu 610065China

Densely.distributed coherent nanoparticles(DCN)in steel matrix can enhance the work-hardening ability.and ductility.of steel *** the routes to this end can be generally.classified into the liquid-solid route and the solid-solid ***,the formation of DCN structures in steel requires long processes and complex *** far,obtaining steel with coherent particle enhancement in a short time remains a bottleneck,and some necessary.steps remain ***,we show a high-efficiency.liquid-phase refining process reinforced by.a dy.amic magnetic ***-y.Mn-O particles had an average size of around(3.53±1.21)nm and can be obtained in just around 180 *** small nanoparticles were coherent with the matrix,imply.ng no accumulated dislocations between the particles and the steel *** findings have a potential application for improving material machining capacity.creep resistance,and radiation resistance.

关键词： ferritic steels coherent particles microstructure compression test work hardening

阻塞性睡眠呼吸暂停综合征是否是神经系统疾病:一项连续呼吸道正压通气的随访研究

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世界核心医学期刊文摘（神经病学分册） 2006年第5期2卷 11-12页

作者： Guilleminault C. huang y. - S. Kirisoglu C. 江山(译) Stanford University.Sleep Disorders Clinic 401 Quarry Road Stanford CA 94117 United States 不详

Abnormal sensory.responses have been found in the upper airway.of obstructive sleep apnea patients, but no long-term study.has been published previously.regarding the evolution of obstructive sleep apnea sy.drome and persistence of abnormal phary.geal sensory.evaluation in response to continuous positive airway.pressure (CPAP) treatment. Over 5 y.ars, we managed healthy. nonobese subjects compliant with nasal CPAP. Only.47 subjects completed this prospective study. due to protocol requirements. They.underwent regular clinical evaluation, subjective scales, four poly.omnographies without nasal CPAP, recalibration of nasal CPAP with poly.omnography. regular downloading of home data, and a palatal two-point discrimination study. None of the subjects presented normal results at any.checkpoint when they.had been without CPAP for two or three nights. By.the completion of the study. all subjects required an increase in nasal CPAP (1- 7cm H2O) and demonstrated abnormal two-point palatal discrimination compared with control subjects. Despite initial control of clinical sy.ptoms with regular usage of nasal CPAP in subjects without weight change, abnormal sensory.palatal evaluation was present at the conclusion of the study. Obstructive sleep apnea sy.drome involves abnormal upper airway.sensory.input, which may.be responsible for the development of apneas and hy.opneas. These neurological lesions are persistent despite nasal CPAP treatment.

关键词：阻塞性睡眠呼吸暂停综合征呼吸道正压通气神经系统疾病随访研究 CPAP治疗健康受试者多导睡眠描记感觉异常上呼吸道感长期研究