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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.
Lower Antibody Response in Chickens Homozygous for the Mx Resistant Allele to Avian Influenza
Qu, L.J.,Li, X.Y.,Xu, G.Y.,Ning, Z.H.,Yang, N. Asian Australasian Association of Animal Productio 2009 Animal Bioscience Vol.22 No.4
The chicken Mx gene has been regarded as a candidate gene for resistance to avian influenza virus (AIV). In this study, three groups of chickens with homozygotes (AA, GG) and heterozygotes (AG) of the resistant (A) and susceptible alleles (G) to AIV of the Mx gene were constructed from a line of dwarf egg-type chickens. These chickens were not examined for their resistant activities to AIV because the differential resistance had only been detected in vitro. The birds of the three groups were vaccinated with inactivated H5N2 AIV vaccine and the level of hemagglutination inhibition (HI) antibody to AIV was detected. The association between disease resistant activity to AIV and antibody response to AIV vaccination in the three groups was analyzed. The chickens with homozygous resistant allele A showed the lowest antibody levels, whereas the heterozygous chickens (AG) presented the highest antibody level after the boosting vaccination, which indicates that the efficiency of artificial selection on the resistant allele of Mx gene will be compromised since the homozygotes of the allele presented the weakest antibody response to the corresponding vaccine.
Genetic Relationships among Different Breeds of Chinese Gamecocks Revealed by mtDNA Variation
Qu, L.J.,Li, X.Y.,Yang, N. Asian Australasian Association of Animal Productio 2009 Animal Bioscience Vol.22 No.8
There are currently five primary breeds of Chinese gamecock, the Henan, Luxi, Tulufan, Xishuangbanna andZhangzhou. Though there is historical evidence of cockfighting in China dating as far back as 2,800 years, the origin and genetic relationships of these breeds are not well understood. We used sequence variation from the mtDNA cytb gene and control region (1,697 bp) to examine the domestication history and genetic relationship of the Chinese gamecock. From 75 samples (14-16 per breed) we found 34 haplotypes, and 45 variable nucleotides. Phylogenetic reconstruction indicated multiple origins of the gamecock breeds. The breeds in the north and center of China, Tulufan, Luxi and Henan, clustered together in a haplogroup and may have the same ancestor. However the southern breeds, Zhangzhou and Xishuangbanna clustered into two isolated haplogroups, suggesting another two origins of Chinese gamecock. Meanwhile, extensive admixture was also found because samples from different breeds, more or less, were always grouped together in the same clades. Based on these results, we discuss the possibilities of multiple origins of gamecock breeds, from both ancestral gamecocks as well as other domestic chickens and red jungle fowl.
Han, J.C.,Wang, Y.L.,Qu, H.X.,Liang, F.,Zhang, J.L.,Shi, C.X.,Zhang, X.L.,Li, L.,Xie, Q.,Wang, C.L.,Yan, Y.Y.,Dong, X.S.,Cheng, Y.H. Asian Australasian Association of Animal Productio 2012 Animal Bioscience Vol.25 No.2
An experiment was conducted to evaluate the effects of one alpha-hydroxycholecalciferol ($1{\alpha}$-OH $D_3$) on growth performance, tibia quality, and skin and meat color in broilers fed calcium (Ca)- and phosphorus (P)-deficient corn-soybean meal diets. A total of 288 male Ross broilers, at 21 days of age, were randomly assigned to three treatments with eight cages per treatment. Three levels of $1{\alpha}$-OH $D_3$ (0, 5, and 10 ${\mu}g$/kg) were added to a basal diet (0.50% Ca, 0.13% non-phytate phosphorus (NPP), and 0.35% total phosphorus (tP)) without vitamin $D_3$. As a result of this study, the addition of $1{\alpha}$-OH $D_3$ increased body weight gain (p<0.001), feed intake (p = 0.007), feed efficiency (p<0.001), tibia weight (p = 0.002), length (p<0.001), breaking-strength (p = 0.012), ash (p<0.001), Ca (p<0.001), and P content (p = 0.004). Dietary $1{\alpha}$-OH $D_3$ enhanced breast meat yellowness (p = 0.015) and the length and weight of the small intestine of the broilers. Moreover, $1{\alpha}$-OH $D_3$ decreased serum Ca concentration (p = 0.074) and breast meat redness (p = 0.010). These results indicate that the $1{\alpha}$-OH $D_3$ improves growth, tibia quality, and meat color in broilers fed Ca- and P-deficient corn-soybean meal diets.
Han, J.C.,Chen, G.H.,Wang, J.G.,Zhang, J.L.,Qu, H.X.,Zhang, C.M.,Yan, Y.F.,Cheng, Y.H. Asian Australasian Association of Animal Productio 2016 Animal Bioscience Vol.29 No.8
This study was conducted to evaluate the relative bioavailability (RBV) of 25-hydroxycholecalciferol (25-OH-$D_3$) to cholecalciferol (vitamin $D_3$) in 1- to 21-d-old broiler chickens fed with calcium (Ca)- and phosphorus (P)-deficient diets. On the day of hatch, 450 female Ross 308 broiler chickens were assigned to nine treatments, with five replicates of ten birds each. The basal diet contained 0.50% Ca and 0.25% non-phytate phosphorus (NPP) and was not supplemented with vitamin D. Vitamin $D_3$ was fed at 0, 2.5, 5.0, 10.0, and $20.0{\mu}g/kg$, and 25-OH-$D_3$ was fed at 1.25, 2.5, 5.0, and $10.0{\mu}g/kg$. The RBV of 25-OH-$D_3$ was determined using vitamin $D_3$ as the standard source by the slope ratio method. Vitamin $D_3$ and 25-OH-$D_3$ intake was used as the independent variable for regression analysis. The linear relationships between the level of vitamin $D_3$ or 25-OH-$D_3$ and body weight gain (BWG) and the weight, length, ash weight, and the percentage of ash, Ca, and P in femur, tibia, and metatarsus of broiler chickens were observed. Using BWG as the criterion, the RBV value of 25-OH-$D_3$ to vitamin $D_3$ was 1.85. Using the mineralization of the femur, tibia, and metatarsus as criteria, the RBV of 25-OH-$D_3$ to vitamin $D_3$ ranged from 1.82 to 2.45, 1.86 to 2.52, and 1.65 to 2.05, respectively. These data indicate that 25-OH-$D_3$ is approximately 2.03 times as active as vitamin $D_3$ in promoting growth performance and bone mineralization in broiler chicken diets.
재태 서,A. Wang,A. Mott,C. Pompey,D. Temple,J. Anderson,J. H. Kim,J. L. Qu,M. Namkung,Q. Yang,Q. Wang,S. Creekmore,S. S. Jung,W. Yu,X. Peng 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
Nonlinear optical properties of cadmium telluride semiconductor nanocrystals were investigated for optical power self-limiting application. The semiconductor nanocrystals were synthesized through colloidal methods. The nonlinear refraction and the nonlinear figure of merit of CdTe nanocrystals in toluene ($\sim$8 $\times$ 10$^{-5}$ mol/L) were estimated to be $\sim$ -1 $\times$ 10$^{-13}$ m$^2$/W and $\sim$200, respectively. The optical power limiting through CdTe nanoscale materials was mainly by the nonlinear refraction because of the high nonlinear FOM.
Qu, L.,Zhang, R.,Shin, H.,Kim, J.,Kim, H. IET 2016 Electronics letters Vol.52 No.22
<P>A ground radiation antenna with tunable metal loads is proposed to improve the performance of a normal antenna at 900 MHz for Z-wave applications. The proposed design is comprised of a 5 mm x 5 mm ground radiation antenna and inductor-connected metal loads in a 30 x 50 mm ground plane. The metal loads can take the form of rims, a frame, strips, or wires at the ends of the ground plane and are connected with lumped elements to allow easy adjustment. The proposed antenna was simulated to tune the metal loads, and was then fabricated and measured to verify its improved performance in the Z-wave band.</P>
J. Zhang,H. Qu,S. Yan,L. R. Yin,D. W. Zhou 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.4
The four hydrogen storage systems including pure MgH2, MgH2-5 wt%NiCl2, MgH2-10 wt%NiCl2 and MgH2-10wt%NiCl2-10 wt%graphene were prepared by ball-milling in this work. Using experimental X-ray diffraction,scanning electron microscopy and differential scanning calorimetry testing methods in combination with firstprinciplecalculations, the dehydrogenation properties and mechanisms of NiCl2 single-doped and NiCl2-grapheneco-doped MgH2 composites were systematically investigated. Experimental results show that the NiCl2 singledopingis conductive to decreasing the size of MgH2 grains and particles. The co-doping of NiCl2 and graphene notonly reduces the size of MgH2 grains and particles, but also contributes to the uniformity of MgH2 particles. Ascompared with milled pure MgH2, the dehydrogenation peak temperatures are decreased by 24 °C and 47 °C forthe 10 wt%NiCl2 single-doped and 10 wt%NiCl2-10 wt%graphene co-doped MgH2 systems, respectively. It isdemonstrated that the co-doping of NiCl2 and graphene exhibits the synergistic effects of confinement and catalysison improving the dehydrogenation properties of MgH2. The first-principle calculations indicate that the codopingof NiCl2 and graphene leads to the distortion of MgH2 atomic-configuration and results in the charge transferbetween the dopants and MgH2, which induce the weakened structural stability and decreased dehydrogenationenthalpy of MgH2.