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China Spallation Neutron Source: Accelerator Design Iterations and R&D Status
J. Wei,C.-D. Deng,C.-H. Wang,C.-T. Shi,H. Sun,H.-F. Ouyang,H.-M. Qu,H.-Y. Dong,J. Li,J. Zhang,J.-S. Cao,J.-Y. Tang,L. Dong,L.-L. Wang,Q. Qin,Q.-B. Wang,S. Wang,S.-N. Fu,S.-X Fang,T. -G. Xu,W. Kang,Y.- 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.I
The China Spallation Neutron Source (CSNS) is a high-power, accelerator-based project currently under preparation. The accelerator complex consists of an H$^-$ ion source, an H$^-$ linac, a rapid-cycling proton synchrotron, and the transport lines. During the past year, the design of most accelerator systems went through major iterations, and initial research and developments was started on the prototyping of several key components.
Dependence of infrared radiation on microstructure of polymer derived ceramic coating on steel
H. Tian,Y.M. Wang,Y. Liu,L.X. Guo,J.H. Ouyang,Y. Zhou,D.C. Jia 한국물리학회 2013 Current Applied Physics Vol.13 No.1
High infrared emissivity ceramic coatings were prepared on 304 steel by pyrolyzing reactions with poly(hydridomethylsiloxane) (PHMS) and Al/Cr2O3 based mixing powders. The effects of pyrolysis temperature, testing temperature and surface roughness on infrared radiation of polymer derived ceramic coating were systematically investigated. The results indicated that the coating pyrolyzed at 800 C exhibited a slightly higher infrared emissivity value than that of the coating pyrolyzed at 600 C, which was attributed to the enhancing photon emission caused by the complete conversion of Al to Al2O3 and PHMS pyrolysis into SiO2, together with the introduction of Cr2O3 based mixing powders. The emissivity value in 3e8 mm waveband of the coating was lower about 0.03 at 600 C compared with 800 C testing temperature, while the emissivity value was almost the same in 8e20 mm waveband. The high surface roughness of the coating led to a slightly increasing emissivity due to the enhancing infrared absorbance.
MODEL-BASED DESIGN OF A VARIABLE NOZZLE TURBOCHARGER CONTROLLER
H. G. ZHANG,E. H. WANG,B. Y. FAN,M. G. OUYANG,S. Z. XIA 한국자동차공학회 2011 International journal of automotive technology Vol.12 No.2
Variable Nozzle Turbocharger (VNT) was invented to solve the problem of matching an ordinary turbocharger with an engine. VNT can harness exhaust energy more efficiently, enhance intake airflow response and reduce engine emissions, especially during transient operating conditions. The difficulty of VNT control lies in how to regulate the position of the nozzle at different engine working conditions. The control strategy designed in this study is a combination of a closedloop feedback controller and an open-loop feed-forward controller. The gain-scheduled proportional-integral-derivative (PID)controller was implemented as the feedback controller to overcome the nonlinear characteristic. As it is difficult to tune the parameters of the gain-scheduled PID controller on an engine test bench, system identification was used to identify the plant model properties at different working points for a WP10 diesel engine on the test bench. The PID controller parameters were calculated based on the identified first-order-plus–dead-time (FOPDT) plant model. The joint simulation of the controller and the plant model was performed in Matlab/Simulink. The time-domain and frequency-domain performances of the entire system were evaluated. The designed VNT control system was verified with engine tests. The results indicated that the real boosting pressure traced the target boosting pressure well at different working conditions.
Improved Enzymatic Synthesis of N-carbamoyl-D-phenylalanine with In situ Product Recovery
Z. Zhou,Z. Yao,H. Q. Wang,H. Xu,P. Wei,P. K. Ouyang 한국생물공학회 2011 Biotechnology and Bioprocess Engineering Vol.16 No.3
D-hydantoinase from Burkholderia cepacia was purified and immobilized onto EAH Sepharose 4B using the carbodiimide method. The enzymatic process for the production of N-carbamoyl-D-phenylalanine via the hydantoinase method was conducted using a special packedbed reactor connected to a DEAE Sepharose FF column for in situ product recovery. This novel apparatus was shown to be effective for pH control, thereby improving the conversion rate. At 40℃, 1.0 g/L substrate concentration,and 10/100 mL adsorbent concentration, the conversion rate of D,L-benzyl hydantoin was 62.7% after the reaction for 14 h, representing an 89.4% increase when compared with that obtained using a packed-bed reactor.
Role of alloying elements in vanadium-based binary alloy membranes for hydrogen separation
Lee, Y.S.,Ouyang, C.,Suh, J.Y.,Fleury, E.,Cho, Y.W.,Shim, J.H. Elsevier Scientific Pub. Co 2012 Journal of membrane science Vol.423 No.-
We investigate the metal-hydrogen interaction in vanadium alloyed with X=Fe, Ni, Al, Ti, and Nb using first-principles calculations. The site energy of interstitial hydrogen depends on both the volume and the presence of a nearby alloying element; the two effects are analyzed separately. The effective volume of the alloying element follows the sequence Nb>Ti>Al>V>Ni>Fe, and a larger volume lowers the site energy on average. Locally, Al appears to be the strongest hydrogen repellent, and Ti exhibits the strongest affinity for hydrogen. The original tetrahedral coordination by the metal atoms is also affected and the effect is the most pronounced in Ni, where the hydrogen atom in the octahedral interstitial site is strongly stabilized. A 16-atom body centered cubic special quasi-random structure is utilized to obtain the statistical distribution of site energies in V<SUB>12</SUB>X<SUB>4</SUB>. The obtained site energies at 673K have the following sequence: Ti<Nb<Al<Ni<Fe. This result indicates that the strongest local repulsion brought by Al is not necessarily correlated to the largest drop in solubility due to the compensation by the elastic effect. The strong repulsion, however, would cause a pronounced decrease in the configurational entropy.
Densification, microstructure and hardness of Sm2Zr2O7/SmAlO3 ceramic composites
Z.-G. Liu,R.-X. Zhu,J.H. Ouyang,Y. Zhou 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.4
The densification behaviour of Sm2Zr2O7/SmAlO3 ceramic composites was studied by pressureless sintering at temperatures of 1500-1700 ℃ for 10 h in air. The microstructure and hardness of Sm2Zr2O7/SmAlO3 ceramic composites were investigated by the X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy and Vickers hardness tester. The Sm2Zr2O7/SmAlO3 ceramic composites are composed of pyrochlore-type Sm2Zr2O7 and perovskite-like SmAlO3 structure. The relative density of Sm2Zr2O7/SmAlO3 ceramic composites increases with increasing sintering temperature. Vickers hardness of Sm2Zr2O7/SmAlO3 ceramic composites slightly increases with increasing SmAlO3 content.