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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.
TUNABLE ELECTRIC CONDUCTIVITIES OF Au-DOPED BORON NITRIDE NANOTUBES
Y. J. CHEN,L. FU,Y. CHEN,J. ZOU,W. H. DUAN,J. LI 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2007 NANO Vol.2 No.6
Tunable electronic properties of nanotubes are an essential requirement for building nanotube circuits and devices. We have produced BN nanotube films with controlled electric conductivities by Au doping. The Au-doped BN nanotube films have been found to exhibit from semiconducting to metallic behavior under different Au contents. Both experimental and computing simulation studies reveal that the conductivities of the doped film are improved by the incorporation of Au atoms into nanotube walls. The doped BN nanotubes and films are expected to have potential applications in catalysts, sensors and nanoelectronics.
Fu, Y.,Jie, J.,Wu, L.,Park, J.,Sun, J.,Kim, J.,Li, T. Elsevier Sequoia 2013 Materials science & engineering. properties, micro Vol.561 No.-
An innovative direct chill casting process to prepare Al-10wt%Si and Al-1wt%Mn alloy circular clad ingots has been developed in the present study. The experimental casting parameters were determined by theoretical analysis, numerical simulation and experimental processes. The interface of clad ingots was investigated by methods of metallographic examination, electron probe microanalysis (EPMA) and transmission electron microscopy (TEM). The results showed that excellent metallurgical bonding of two different aluminum alloys could be achieved by direct chill casting. The Al-1Mn alloy which was poured into the mold earlier served as the substrate for heterogeneous nucleation of Al-10Si alloy. Because of diffusion of Si and Mn elements, a diffusion layer with a thickness of about 40μm on average between the Al-10Si and Al-1Mn alloys could be obtained. The tensile strength of the clad ingot was 106.8MPa and the fractured position was located in the Al-1Mn alloy side, indicating the strength of the interfacial region is higher than that of Al-1Mn alloy.
Wind effects on a large cantilevered flat roof: loading characteristics and strategy of reduction
Fu, J.Y.,Li, Q.S.,Xie, Z.N. Techno-Press 2005 Wind and Structures, An International Journal (WAS Vol.8 No.5
Mean and extreme pressure distributions on a large cantilevered flat roof model are measured in a boundary layer wind tunnel. The largest peak suction values are observed from pressure taps beneath conical "delta-wing type" corner vortices that occur for oblique winds, then the characteristics and causes of the local peak suctions are discussed in detail. Power spectra of fluctuating wind pressures measured from some typical taps located at the roof edges under different wind directions are presented, and coherence functions of fluctuating pressures are also obtained. Based on these results, it is verified that the peak suctions are highly correlated with the conical vortices. Furthermore, according to the characteristics of wind loads on the roof, an aerodynamic solution to minimize the peak suctions by venting the leading edges and the corners of the roof is recommended. The experimental results show that the suggested strategy can effectively control the generation of the conical vortices and make a reduction of 50% in mean pressures and 25% in extreme local pressures at wind sensitive locations on the roof.
Characteristics and Potential Applications of the Proton Beams at the CSNS
J. Y. Tang,S. N. Fu,J. Wei 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.3
The China Spallation Neutron Source (CSNS) is a large scientific research facility mainly serving the multidisciplinary research on material structure by using the neutron scattering technique. The accelerators can provide a proton beam of 120 kW with a repetition rate of 25 Hz, and can be upgraded to 240 kW (CSNS-II) or 500 kW (CSNS-II'). Besides as a driving source for the spallation target, the proton beams can be exploited for various applications both in fundamental research and in applications. The utilization of the CSNS proton beams can be in two different modes: the parasitic mode and the dedicated mode. The former one does not affect the normal operation of the spallation neutron source, and the latter can provide the full potential of the CSNS accelerators. Applications using the CSNS proton beams will be in two separate areas, utilizing the beams from the linac and from the RCS, respectively. Some of the CSNS proton beam applications are space single event effect and space radiology studies, white neutron source, proton therapy on ocular melanomas and low-depth cancers, fast neutron therapy, and borium capture neutron therapy. Other applications, such as testing studies of particle detectors, non-space radio-biological studies, radiation material studies, and nuclear physics, are also under consideration. The China Spallation Neutron Source (CSNS) is a large scientific research facility mainly serving the multidisciplinary research on material structure by using the neutron scattering technique. The accelerators can provide a proton beam of 120 kW with a repetition rate of 25 Hz, and can be upgraded to 240 kW (CSNS-II) or 500 kW (CSNS-II'). Besides as a driving source for the spallation target, the proton beams can be exploited for various applications both in fundamental research and in applications. The utilization of the CSNS proton beams can be in two different modes: the parasitic mode and the dedicated mode. The former one does not affect the normal operation of the spallation neutron source, and the latter can provide the full potential of the CSNS accelerators. Applications using the CSNS proton beams will be in two separate areas, utilizing the beams from the linac and from the RCS, respectively. Some of the CSNS proton beam applications are space single event effect and space radiology studies, white neutron source, proton therapy on ocular melanomas and low-depth cancers, fast neutron therapy, and borium capture neutron therapy. Other applications, such as testing studies of particle detectors, non-space radio-biological studies, radiation material studies, and nuclear physics, are also under consideration.
J.L. Cui,Y.M. Yan,H. Fu,X.J. Zhang,Y.L. Gao,Y. Deng 한국물리학회 2012 Current Applied Physics Vol.12 No.1
We have performed a comparative investigation of the series compounds (InSb)nCum to assess the roles of Cu addition on the thermoelectric properties and nanostructuring in bulk InSb. Detailed temperature dependent transport properties including electrical conductivity, the Seebeck coefficient, and thermal conductivity are presented. The Seebeck coefficients of In20Sb20Cu (m:n ¼ 1:20) are increased by 13percent in magnitude if compared to those of InSb, which is responsible for the 22 percent enhancement in the highest ZT value at 687 K. Although the magnitudes of kL are larger than those of InSb over the entire temperature range, a remarkable reduction in lattice thermal conductivities (kL) was observed with measuring temperature elevation. Such changes are mainly due to the precipitation of a large number of Cu9In4 nanoparticles with the size of smaller than 5 nm, dispersed in the matrix observed using high resolution transmission electron microscopy (HRTEM) images.