Fabrication and microstructure of hot pressed laminated Y₂O₃/Nd:Y₂O₃/Y₂O₃ transparent ceramics

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.

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.

Effects of the Zr concentration on transparent Y2O3 ceramics fabricated by vacuum pre-sintering and a subsequent HIP treatment

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>

AN EXPERIMENTAL STUDY ON AXIAL FLOW PUMP OPERATED AS A TURBINE MODEL WITH DRAFT TUBE

AUGUSTO GERARDO L,KIKUYAMA KOJI,LIM LAURENCE A. GAN,HASEGAWA YUTAKA,KALAW MARTIN ERNESTO L 한국수자원학회 2005 한국수자원학회 학술대회 Vol.2005 No.1

Discovery of a Very Large (≈20 kpc) Galaxy at <i>z</i> = 3.72

Lee, Kyoung-Soo,Dey, Arjun,Matheson, Thomas,Shi, Ke,Hung, Chao-Ling,Xue, Rui,Inami, Hanae,Huang, Yun,Lee, Khee-Gan,Ashby, Matthew L. N.,Jannuzi, Buell,Reddy, Naveen,Hong, Sungryong,Mo, Wenli,Malavasi, American Astronomical Society 2018 The Astrophysical journal Vol.862 No.1

<P>We report the discovery and spectroscopic confirmation of a very large star-forming galaxy, G6025, at z(spec) = 3.721 +/- 0.003. In the rest frame approximate to 2100 angstrom, G6025 subtends approximate to 24 kpc in physical extent when measured from the 1.5 sigma isophote, in agreement with the parametric size measurements that yield a half-light radius of 4.9 +/- 0.5 kpc and a semimajor axis of 12.5 +/- 0.1 kpc. It is also very UV-luminous (approximate to 5L(UV,z similar to 4)*) and young (approximate to 140 +/- 60 Myr). Despite its unusual size and luminosity, the stellar population parameters and dust reddening (M-star similar to M-z similar to 4*( )and E(B - V) similar to 0.18 +/- 0.05) estimated from the integrated light are similar to those of smaller galaxies at comparable redshifts. The ground-based morphology and spectroscopy show two dominant components, both located off-center, embedded in more diffuse emission. We speculate that G6025 may be a scaled-up version of chain galaxies seen in deep HST imaging or, alternatively, a nearly equal-mass merger involving two super-L* galaxies in its early stage. It lies close to but not within a known massive protocluster at z = 3.78. We find four companions within 6 Mpc from G6025, two of which lie within 1.6 Mpc. While the limited sensitivity of the existing spectroscopy does not allow us to robustly characterize the local environment of G6025, it likely resides in a locally overdense environment. The luminosity, size, and youth of G6025 make it uniquely suited to study the early formation of massive galaxies in the universe.</P>

IRRADIATION PERFORMANCE OF U-Mo MONOLITHIC FUEL

Meyer, M.K.,Gan, J.,Jue, J.F.,Keiser, D.D.,Perez, E.,Robinson, A.,Wachs, D.M.,Woolstenhulme, N.,Hofman, G.L.,Kim, Y.S. Korean Nuclear Society 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 at relatively low temperatures. Research reactor fuels are designed for efficient heat rejection, and are composed of assemblies of thin-plates clad in aluminum alloy. The development of low-enriched fuels to replace high-enriched fuels for these reactors requires a substantially increased uranium density in the fuel to offset the decrease in enrichment. Very few fuel phases have been identified that have the required combination of very-high uranium density and stable fuel behavior at high burnup. U-Mo alloys represent the best known tradeoff in these properties. Testing of aluminum matrix U-Mo aluminum matrix dispersion fuel revealed a pattern of breakaway swelling behavior at intermediate burnup, related to the formation of a molybdenum stabilized high aluminum intermetallic phase that forms during irradiation. In the case of monolithic fuel, this issue was addressed by eliminating, as much as possible, the interfacial area between U-Mo and aluminum. Based on scoping irradiation test data, a fuel plate system composed of solid U-10Mo fuel meat, a zirconium diffusion barrier, and Al6061 cladding was selected for development. Developmental testing of this fuel system indicates that it meets core criteria for fuel qualification, 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.

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

PRODUCTION OF A LAURIC ACID SUPPLEMENT TO LOWER THE AMOUNT OF LOW-DENSITY LIPOPROTEINS

Patricia Rochelle O. Gan,Louise Joy A. Martin,Paula Nadine L. Sanchez,Ms. Ana Victoria Lloren 국제과학영재학회 2012 APEC Youth Scientist Journal Vol.4 No.-

This project produced a lauric acid mixture consisting of lauric acid and non-fat milk, which contained components that lowered the cholesterol to HDL-LDL ratio in the system. This was done to pinpoint its effects on blood cholesterol levels in the hopes of lowering the amount of plaque found in the blood vessels. In the feasibility study, three out of the prospective twelve mice (4 groups of 3 mice) were given treatments of 2.00 mg lauric acid per 2.00 mL milk. The control mouse was given no lauric acid. After acclimatization, atherosclerosis was induced by feeding all mice 1.00 gram of butter per mice per day for two weeks. Blood was then extracted from the saphenous vein of the control mouse. After a month of treatment, blood was again extracted. The LDL-C (low density lipoprotein-cholesterol) ratios ranged from 1.90 to 18.3 from an initial 37.9 and the HDL-C (high density lipoproteins-cholesterol) ratios ranged from 19.4 to 28.4 from an initial 34.6. The t-tests (α = 0.05) show that there is a significant difference between the initial and final levels, which may then lead to the creation of a supplement that will lessen the susceptibility of atherosclerosis in humans.

Compressibility of Changi sand in K₀ consolidation

Wanatowski, D.,Chu, J.,Gan, C.L. Techno-Press 2009 Geomechanics & engineering Vol.1 No.3

The one-dimensional compressibility of sand is an important property for the estimation of settlement or deformation of sand deposits. The $K_0$ value of sand is also an important design parameter. Experimental results are presented in this paper to study the compressibility of sand in $K_0$ consolidation tests. The $K_0$ consolidation tests were carried out using a triaxial cell and a plane-strain apparatus. Specimens prepared using both the moist tamping and the water sedimentation methods were tested. The testing data demonstrate that the type of testing apparatus does not affect the $K_0$ measurement if proper boundary conditions are imposed in the tests. The data also show that the compressibility and the $K_0$ value of loose sand specimens prepared using the moist tamping method are very sensitive to the variation of void ratio. The $K_0$ values measured from these tests do not agree with the $K_0$ values calculated from Jaky's equation. The compressibility and $K_0$ values of sand obtained from tests on specimens prepared using different preparation methods are different which may reflect the influence of soil fabrics or structures on the one dimensional compression behavior of sand.

Effects of Sown Season and Maturity Stage on In vitro Fermentation and In sacco Degradation Characteristics of New Variety Maize Stover

Tang, S.X.,Li, F.W.,Gan, J.,Wang, M.,Zhou, C.S.,Sun, Z.H.,Han, X.F.,Tan, Z.L. Asian Australasian Association of Animal Productio 2011 Animal Bioscience Vol.24 No.6

The effects of seedtime and maturity stage on nutritive value of five maize stover varieties, including conventional maize (Kexiangyu 11, CM), fodder maize (Huqing 1, FM), high oil maize (Gaoyou 115, HOM), sweet maize (Kexiangtianyu 1, SM) and waxy maize (Kexiangluoyu 1, WM), were examined based on chemical composition, in vitro gas production and in situ incubation techniques. Maize stover was sampled at d 17 and d 30 after tasseling, and designated as maturity stage 1 and stage 2, respectively. The average dry matter (DM) organic matter (OM), crude protein (CP) and fiber contents were the greatest for HOM, SM and FM, respectively. CM had the highest in vitro organic matter disappearance (IVOMD) and volatile fatty acid (VFA) concentration. The highest ammonia nitrogen ($NH_3$-N) concentration in the incubation solution, and effective degradability of DM ($ED_{DM}$) and neutral detergent fiber ($ED_{NDF}$) were observed in SM. Advanced maturity stage increased (p<0.05) DM content, $ED_{DM}$ and $ED_{NDF}$, but decreased (p<0.05) OM and CP contents, and decreased (p<0.05) b and a+b values, IVOMD and molar proportion of valerate in the incubation solution for maize stover. Maize sown in summer had greater (p<0.05) OM content, but lower DM, CP, neutral detergent fiber (NDF) and acid detergent fiber (ADF) content compared with maize sown in spring. Maize sown in summer had greater (p<0.001) IVOMD, $NH_3$-N concentration in the incubation solution and $ED_{NDF}$, but lower (p<0.01) ratio of acetate to propionate compared to maize sown in spring. The interaction effect of variety${\times}$seedtime was observed running through almost all chemical composition, in vitro gas production parameters and in situ DM and NDF degradability. The overall results suggested that SM had the highest nutrient quality, and also indicated the possibility of selecting maize variety and seedtime for the utilization of maize stover in ruminants.