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Gan, L.,Park, Y.J.,Kim, H.,Kim, J.M.,Ko, J.W.,Lee, J.W. Elsevier Science Publishers 2016 Journal of the European Ceramic Society Vol.36 No.3
A transparent three-layered composite Y<SUB>2</SUB>O<SUB>3</SUB>/1at% Nd:Y<SUB>2</SUB>O<SUB>3</SUB>/Y<SUB>2</SUB>O<SUB>3</SUB> ceramic was successfully fabricated by a hot-pressing method. After the hot-pressing step, the laminar structure was maintained very well, and no apparent deformation was found. The sample shows a fine microstructure (the average grain size is ~1μm) without an apparent transition layer between a Nd-doped layer and an undoped layer as a result of the relatively low hot-pressing temperature of only 1600<SUP>o</SUP>C. For a 4-mm-thick polished specimen, the in-line transmittance reaches 59.7% at 400nm and 73.0% at 1100nm.
Zhu, L. L.,Park, Y. J.,Gan, L.,Go, S. I.,Kim, H. N.,Kim, J. M.,Ko, J. W. Chapman and Hall 2017 Journal of materials science Materials in electron Vol. No.
<P>Highly transparent Y2O3 ceramics doped with different Zr concentrations were successfully fabricated by vacuum pre-sintering at temperatures ranging from 1600 to 1800 degrees C combined with a subsequent hot-isostatic pressing (HIP) treatment using commercial powders as the starting materials. All of the 1 mol% Zr-doped Y2O3 ceramics exhibit very good optical quality. The sample with the highest transparency level was realized by vacuum sintering at 1650 degrees C for 4 h followed by a post-HIP treatment at 1450 degrees C lasting 5 h. It has a fine microstructure and the grain size is 1.48 mu m. Furthermore, the in-line transmittance reaches 83.3% at 1100 nm (1.2 mm thickness). It was found that a relatively low vacuum sintering temperature (1650 degrees C) and relatively low Zr doping concentration (1 mol%) are more appropriate to achieve optimally transparent Y2O3 ceramics with a subsequent HIP treatment.</P>
Association of SNP Haplotypes at the Myostatin Gene with Muscular Hypertrophy in Sheep
Gan, S.Q.,Du, Z.,Liu, S.R.,Yang, Y.L.,Shen, M.,Wang, X.H.,Yin, J.L.,Hu, X.X.,Fei, J.,Fan, J.J.,Wang, J.H.,He, Q.H.,Zhang, Y.S.,Li, N. Asian Australasian Association of Animal Productio 2008 Animal Bioscience Vol.21 No.7
The myostatin gene of seven important meat (Beltex (Australia), Beltex$\times$Huyang (F1), Meat and Multi-Prolific Chinese Merino Fine Wool, Meat Chinese Merino Fine Wool and Dorper (South Africa)) and non-meat (Huyang and Kazak) sheep breeds was analyzed to study the genetic basis of muscular hypertrophy (double muscling) phenotype in sheep. SNPs, four in regulatory regions and several in the introns in the myostatin gene, were identified, and the former four SNPs were used for further studies. Twelve haplotypes were predicted by PHASE program, of which four main haplotypes (1, 3, 7, 9) were present in 90% of the 364 sheep in the study. Haplotypes 1-4 were mainly present in meat breeds while haplotypes 7 and 9 dominated the non-meat breeds. The association between haplotypes and average daily gain (ADG) was analyzed among 116 sheep with production data, Haplo2 (CGAA) and Haplo8 (TGAA) were identified to have significant (p<0.05) effect on ADG by the model (JMP5.1 software) taking into account the effects of breed, family background, haplotype, birth weight and sex. ADG of these haplotype groups also correlated well (r = 0.82) with hypertrophic phenotype scores. In conclusion, the mutations -956 (T$\rightarrow$C), -41 (C$\rightarrow$A) and 6223 (G$\rightarrow$A) involved in Haplo2 and 8 may be associated with the double-muscling trait by influencing myostatin function and be suitable markers in selecting meat sheep.
A switched-system approach to formation control and heading consensus for multi-robot systems
Jin, J.,Ramirez, J. P.,Wee, S.,Lee, D.,Kim, Y.,Gans, N. SPRINGER SCIENCE + BUSINESS MEDIA 2018 Intelligent service robotics Vol.11 No.2
<P>This paper proposes a novel, hybrid and decentralized, switched-system approach for formation and heading consensus control of mobile robots under switching communication topology, including collision avoidance capability. The set of robots consists of nonholonomic wheeled mobile robots and can include a teleoperated UAV. The key feature of this approach is a virtual graph, which is derived by adding a set of relative translation vectors to the real graph of the multiple robots. Our approach results in the robots in the real graph moving to the desired formation and achieving heading consensus while the virtual robots on the virtual graph reach pose consensus. If any robot detects a nearby obstacle or other robot, the robot will temporarily move along an avoidance vector, which is perpendicular and positively projected onto the attractive vector, such that collision is avoided while minimally deviating from its formation control path. Experimental results are provided by two different research groups to demonstrate the effectiveness of our approach. These experiments extend the theoretical development by introducing a teleoperated quadrotor as a leader robot of the multi-robot systems. The same control law works for the extended system, with no modifications.</P>
Irradiation Performance of U-Mo Monolithic Fuel
M.K. Meyer,J.GAN,D.D. KEISER,E. PEREZ,A. ROBINSON,D.M. WACHS,N. WOOLSTENHULME,G.L. Hofman,Y. S. Kim 한국원자력학회 2014 Nuclear Engineering and Technology Vol.46 No.2
High-performance research reactors require fuel that operates at high specific power to high fission density, but atrelatively low temperatures. Research reactor fuels are designed for efficient heat rejection, and are composed of assemblies ofthin-plates clad in aluminum alloy. The development of low-enriched fuels to replace high-enriched fuels for these reactorsrequires a substantially increased uranium density in the fuel to offset the decrease in enrichment. Very few fuel phases havebeen identified that have the required combination of very-high uranium density and stable fuel behavior at high burnup. UMoalloys represent the best known tradeoff in these properties. Testing of aluminum matrix U-Mo aluminum matrixdispersion fuel revealed a pattern of breakaway swelling behavior at intermediate burnup, related to the formation of amolybdenum stabilized high aluminum intermetallic phase that forms during irradiation. In the case of monolithic fuel, thisissue was addressed by eliminating, as much as possible, the interfacial area between U-Mo and aluminum. Based on scopingirradiation test data, a fuel plate system composed of solid U-10Mo fuel meat, a zirconium diffusion barrier, and Al6061cladding was selected for development. Developmental testing of this fuel system indicates that it meets core criteria for fuelqualification, including stable and predictable swelling behavior, mechanical integrity to high burnup, and geometric stability. In addition, the fuel exhibits robust behavior during power-cooling mismatch events under irradiation at high power
AN INTERPRETATION OF THE POSSIBLE MECHANISMS OF TWO GROUND-LEVEL ENHANCEMENT EVENTS
Firoz, Kazi A.,Gan, W. Q.,Moon, Y.-J.,LI, C. IOP Publishing 2012 The Astrophysical journal Vol.758 No.2
<P>We have carried out this work to clarify the possible mechanisms of two important high-energy particle events (GLE69 2005 January 20, 06: 46 UT and GLE70 2006 December 13, 02: 45 UT). For this purpose, the cosmic-ray intensities registered by neutron monitors at several sites have been analyzed and studied with concurrent solar flares of different energy bands. To determine whether the ground-level enhancement (GLE) might be caused by the energy released from a solar flare or a CME-driven shock, we identify the particle injection time in terms of the lowest value of the spectral indices deduced from proton fluxes. If the GLE is caused by the energy released from particle acceleration in a solar flare, the intensive phase of the flare representing extreme emission should lie within the injection time. While fulfilling this criterion, it is further necessary to understand the possible relativistic energy computed in terms of the possible travel time deduced by employing the observational time lag between the GLE and the concurrent solar flare. Accordingly, we have found that GLE69 is procured with sufficient possible relativistic energy (similar to 1.619 GeV) by the energy released from particle accelerations in the intensive phases of a solar flare components that have been corroborated by the injection time. The intensive phases of the flare components have also been justified with the prominent phases of a solar radio type III burst. For event GLE70, the particle injection time lies within the CME-driven shock justified by a solar radio type II burst which seems to be capable of procuring sufficient possible relativistic energies (similar to 1.231 to similar to 2.017 GeV). It is also noted that any fractional amount of energy (similar to 0.226 to similar to 0.694 GeV) from preceding flare components might be considered as a contribution to the shock acceleration process. Thus, GLE70 is presumably caused by the sum of the energy released mostly from a CME-driven shock and partially from preceding flare components.</P>