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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.
Performance prediction of transonic axial compressor based on streamline curvature method
J. F. Hu,X. CH. Zhu,H. OuYang,X. Q. Qiang,ZH. H. Du 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.12
The streamline curvature (SLC) method is still of great importance for modern compressor performance prediction. The models applied in it, such as minimum incidence, deviation and loss, affect prediction's accuracy directly. An improved SLC approach is introduced in this paper, which is developed based on the analysis and summary of predecessor's works. The improvement is embodied mainly in the incidence and loss, which is the result of a combination of the previous models and models’ revisions in order to consider the main effects for modern compressor cascade. A certain isolated stage axial transonic compressor is calculated by SLC method. The speed lines and span-wise aerodynamic parameters are compared with the experiment data to demonstrate the SLC approach presented in this paper.
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.
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.