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Search Results: 1 - 10 of 372086 matches for " B-C Xu "
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Effects of limited irrigation on yield and water use efficiency of two sequence-replaced winter wheat in Loess Plateau, China
L Liu, B-C Xu, F-M Li
African Journal of Biotechnology , 2007,
Abstract: The effects of irrigation on grain yield and water use efficiency was studied on two sequence replaced dryland winter wheat (Triticum aestivum L.) cultivars, Changwu 135 (CW, a new cultivar) and Pingliang 40 (PL, an old cultivar). Field experiments were carried out on Changwu country on Loess Plateau, China. Whereas the control plots were not irrigated at all, the treatment plots were irrigated three times, the quantity of irrigation being the same (40 mm) each time: at the jointing stage, at booting, and at flowering. Irrigation increased root biomass in each layer of soil in PL. Irrigation made PL produce greater root biomass in deeper soil, enabling the plants to tap larger quantities of water. CW had a harvest index (HI) greater by 0.11 than that of PL under both conditions, and lower shoot and root biomass, which indicates that more dry matter was transported to productive organs, leading to higher yields than PL. CW consumed more water to produce a unit quantity of root biomass and use irrigation less efficiently showing undercompensation, whereas PL showed overcompensation. Higher yield and greater water use efficiency in wheat appear to be associated with smaller root systems and higher harvest index irrespective of irrigation.
Galactic structure studies with BATC star counts
Cuihua Du,Xu Zhou,Jun Ma,Alfred B-C Chen,Yanbin Yang,Jiuli Li,Hong Wu,Zhaoji Jiang,Jiansheng Chen
Physics , 2003, DOI: 10.1051/0004-6361:20030532
Abstract: We report the first results of star counts carried out with the National Astronomical Observatories (NAOC) 60/90 cm Schmidt Telescope in 15 intermediate-band filters from 3000 to 10000 {\AA} in the BATC survey. We analyze a sample of over 1400 main sequence stars ($14\le$V$\le21$), which lie in the field with central coordinates R.A.=$09^h53^m13^s.30$ and DEC=47$^\circ49^{\prime}00^{\prime\prime}.0$ (J2000). The field of view is 0.95 deg$^{2}$, and the spatial scale was $1\arcsec.67$. In our model, the distribution of stars perpendicular to the plane of the Galaxy is given by two exponential disks (thin disk plus thick disk) and a de Vaucouleurs halo. Based on star counts, we derive the scale heights of the thin disk to be $320^{+14}_{-15}$ pc and of the thick disk to be $640^{+30}_{-32}$ pc, respectively, with a local density of $7.0\pm1%$ of the thin disk. We find that the observed counts support an axial ratio of $c/a\le0.6$ for a de Vaucouleurs $r^{1/4}$ law, implying a more flattened halo. We also derive the stellar luminosity function (SLF) for the thin disk, and it partly agrees with the Hipparcos luminosity function.
Study of pharmacokinetics and tissue distribution of liposomal brucine for dermal administration
Yang B-C,Chu Z-F,Zhu S,Wang L-J
International Journal of Nanomedicine , 2011,
Abstract: Bai-Can Yang1, Zhi-Feng Chu1, Sha Zhu1, Li-Jun Wang1, Yu-Hong Feng1, Feng-Hua Li1, Chang-Sheng Liu2, Yuan Yuan21Pharmacy Department of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, People’s Republic of China; 2Key Laboratory for Ultrafine Materials of Ministry of Education, and Engineering Research Center for Biomedical Materials of Ministry of Education, East China University of Science and Technology, Shanghai, People’s Republic of ChinaObjective: To evaluate the pharmacokinetics and tissue distribution of liposomal brucine (LB) for dermal application.Methods: Pharmacokinetics and tissue distribution were studied by in vivo animal testing. High performance liquid chromatography (HPLC) was used to detect the concentration of brucine in rats’ skin, plasma and various tissues.Results: After dermal administration, LB was absorbed rapidly in the skin and could be detected after 0.5 hours. After 36 hours, levels were too low to be detected. In plasma, levels were also too low to be detected after 36 hours. The concentration of LB reached 50% of the maximum in all tissues except the brain, peaking after 1.5 hours but still detectable after 12 hours.Conclusion: The concentration of LB was high in skin at the application site. LB was quickly absorbed into tissues through the blood circulation and widely distributed throughout the whole body. There was no obvious toxicity and LB did not readily accumulate in tissues and organs. It showed local potency but low overall systemic toxicity.Keywords: liposomal brucine, dermal administration, pharmacokinetics, tissue distribution
Study of pharmacokinetics and tissue distribution of liposomal brucine for dermal administration
Yang B-C, Chu Z-F, Zhu S, Wang L-J, Feng Y-H, Li F-H, Liu C-S, Yuan Y
International Journal of Nanomedicine , 2011, DOI: http://dx.doi.org/10.2147/IJN.S17255
Abstract: udy of pharmacokinetics and tissue distribution of liposomal brucine for dermal administration Original Research (4106) Total Article Views Authors: Yang B-C, Chu Z-F, Zhu S, Wang L-J, Feng Y-H, Li F-H, Liu C-S, Yuan Y Published Date May 2011 Volume 2011:6 Pages 1109 - 1116 DOI: http://dx.doi.org/10.2147/IJN.S17255 Bai-Can Yang1, Zhi-Feng Chu1, Sha Zhu1, Li-Jun Wang1, Yu-Hong Feng1, Feng-Hua Li1, Chang-Sheng Liu2, Yuan Yuan2 1Pharmacy Department of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, People’s Republic of China; 2Key Laboratory for Ultrafine Materials of Ministry of Education, and Engineering Research Center for Biomedical Materials of Ministry of Education, East China University of Science and Technology, Shanghai, People’s Republic of China Objective: To evaluate the pharmacokinetics and tissue distribution of liposomal brucine (LB) for dermal application. Methods: Pharmacokinetics and tissue distribution were studied by in vivo animal testing. High performance liquid chromatography (HPLC) was used to detect the concentration of brucine in rats’ skin, plasma and various tissues. Results: After dermal administration, LB was absorbed rapidly in the skin and could be detected after 0.5 hours. After 36 hours, levels were too low to be detected. In plasma, levels were also too low to be detected after 36 hours. The concentration of LB reached 50% of the maximum in all tissues except the brain, peaking after 1.5 hours but still detectable after 12 hours. Conclusion: The concentration of LB was high in skin at the application site. LB was quickly absorbed into tissues through the blood circulation and widely distributed throughout the whole body. There was no obvious toxicity and LB did not readily accumulate in tissues and organs. It showed local potency but low overall systemic toxicity.
GASKAP -- The Galactic ASKAP Survey
J. M. Dickey,N. McClure-Griffiths,S. J. Gibson,J. F. Gomez,H. Imai,P. Jones,S. Stanimirovic,J. Th. van Loon,A. Walsh,A. Alberdi,G. Anglada,L. Uscanga,H. Arce,M. Bailey,A. Begum,B. Wakker,N. Ben Bekhti,P. Kalberla,B. Winkel,K. Bekki,B. -Q. For,L. Staveley-Smith,T. Westmeier,M. Burton,M. Cunningham,J. Dawson,S. Ellingsen,P. Diamond,J. A. Green,A. S. Hill,B. Koribalski,D. McConnell,J. Rathborne,M. Voronkov,K. A. Douglas,J. English,H. A. Ford,T. Foster,Y. Gomez,A. Green,J. Bland-Hawthorn,S. Gulyaev,M. Hoare,G. Joncas,J-H. Kang,C. R. Kerton,B-C. Koo,D. Leahy,N. Lo,F. J. Lockman,V. Migenes,J. Nakashima,Y. Zhang,D. Nidever,J. E. G. Peek,D. Tafoya,W. Tian,D. Wu
Physics , 2012, DOI: 10.1017/pasa.2012.003
Abstract: A survey of the Milky Way disk and the Magellanic System at the wavelengths of the 21-cm atomic hydrogen (HI) line and three 18-cm lines of the OH molecule will be carried out with the Australian Square Kilometre Array Pathfinder telescope. The survey will study the distribution of HI emission and absorption with unprecedented angular and velocity resolution, as well as molecular line thermal emission, absorption, and maser lines. The area to be covered includes the Galactic plane (|b|< 10deg) at all declinations south of delta = +40deg, spanning longitudes 167deg through 360deg to 79deg at b=0deg, plus the entire area of the Magellanic Stream and Clouds, a total of 13,020 square degrees. The brightness temperature sensitivity will be very good, typically sigma_T ~ 1 K at resolution 30arcsec and 1 km/s. The survey has a wide spectrum of scientific goals, from studies of galaxy evolution to star formation, with particular contributions to understanding stellar wind kinematics, the thermal phases of the interstellar medium, the interaction between gas in the disk and halo, and the dynamical and thermal states of gas at various positions along the Magellanic Stream.
The Emergence and Development of Social Assistance in Beijing
Joe C. B. Leung,Yuebin Xu
Provincial China , 2009,
Abstract: As an integral part of the social protection system, the social assistance program in China was fully implemented in all cities in 1999. In recent years, the government has made a further commitment to guide its development, extension, and institutionalization. Accordingly, it has grown dramatically in recent years both in terms of expenditure and number of recipients. It acts as a last resort ‘safety net’ for urban poverty-stricken residents and as a ‘shock absorber’ mitigating social tensions resulting from market-oriented reforms. This paper presents an analysis of the background and development of the social assistance program in Beijing, focusing on issues related to the design and implementation of the program. Relying as it does on a decentralized delivery structure at the neighborhood level, Beijing social assistance programs can have substantial variations in terms of practice and outcomes. This paper proposes that in the long term, China needs to design a more coherent and integrated social protection system.
Adsorption of Hg0 on the Unburned Carbon with HF Acid Leaching  [PDF]
Jinjing Luo, J.Y. Hwang, B. C. Greenlund, Zhiyong Xu
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2004, DOI: 10.4236/jmmce.2004.31005
Abstract: Unburned carbons from fly ash were leached with concentrated HF acid solutions in this study. The mercury adsorption abilities of the treated unburned carbons were examined. Effects of temperature, contact time, preloaded mercury emission and gaseous mercury concentration on adsorption behaviors were investigated. Leached by HF acid solution, unburned carbons were altered both physically and chemically. The influences of structure alteration on adsorption behaviors were also discussed.
Propagating left/right asymmetry in the zebrafish embryo: one-dimensional model
Hanrong Chen,C. L. Henley,B. Xu
Quantitative Biology , 2011,
Abstract: During embryonic development in vertebrates, left-right (L/R) asymmetry is reliably generated by a conserved mechanism: a L/R asymmetric signal is transmitted from the embryonic node to other parts of the embryo by the L/R asymmetric expression and diffusion of the TGF-$\beta$ related proteins Nodal and Lefty via propagating gene expression fronts in the lateral plate mesoderm (LPM) and midline. In zebrafish embryos, Nodal and Lefty expression can only occur along 3 narrow stripes that express the co-receptor \emph{one-eyed pinhead} (oep): Nodal along stripes in the left and right LPM, and Lefty along the midline. In wild-type embryos, Nodal is only expressed in the left LPM but not the right, because of inhibition by Lefty from the midline; however, bilateral Nodal expression occurs in loss-of-handedness mutants. A two-dimensional model of the zebrafish embryo predicts this loss of L/R asymmetry in oep mutants \cite{henley-xu-burdine}. In this paper, we simplify this two-dimensional picture to a one-dimensional model of Nodal and Lefty front propagation along the oep-expressing stripes. We represent Nodal and Lefty production by step functions that turn on when a linear function of Nodal and Lefty densities crosses a threshold. We do a parameter exploration of front propagation behavior, and find the existence of \emph{pinned} intervals, along which the linear function underlying production is pinned to the threshold. Finally, we find parameter regimes for which spatially uniform oscillating solutions are possible.
Accumulation of Mineral Nutrients and Phytochemicals in Lettuce and Tomato Grown in High Tunnel and Open Field  [PDF]
Amanda Woolley, Samuel Sumpter, Myungjin Lee, Jingwen Xu, Shannon Barry, Weiqun Wang, C. B. Rajashekar
American Journal of Plant Sciences (AJPS) , 2019, DOI: 10.4236/ajps.2019.101011
Abstract: High tunnel production of horticultural food crops is becoming increasingly popular and has a significant impact on their growth, productivity and nutritional quality. The present study examines the effect of high tunnel production of lettuce (Lactuca sativa cv. “Two Star” and “New Red Fire”) and tomato (Solanum lycopersicum cv. “Celebrity” and “Mountain Fresh”) on their nutritional quality relating to major nutrients and health-promoting phytochemicals. High tunnel environment increased the concentration of N (protein) in both lettuce and tomato relative to the open field cultivation. The accumulation pattern of mineral nutrients in high tunnel was similar in green-leaf and red-leaf lettuce varieties. Lettuce varieties grown in high tunnel had higher accumulation of C, S and Zn relative to those grown in open field. However, high tunnel environment suppressed the accumulation of many micronutrients such as Mg, Fe, Cu and Mn in both lettuce varieties but not in tomato. For example, accumulation of Fe was reduced by more than 80% in “Two Star and by more than 55% in “New Red Fire” under high tunnel. It also suppressed the levels of many health-promoting phenolic compounds such as chlorogenic acid, chicoric acid, rutin and kaempferol in green-leaf lettuce and gallic acid in red-leaf lettuce. High tunnel environment improved the soil nutrient status but reduced the radiation levels (PAR, UV-A and UV-B) received by the crops. The results show that the high tunnel production has a significant impact on the nutritional quality relating to protein and mineral nutrients in both crops and health-promoting phytochemicals in lettuce.
Investigations on the Plastic Instability in an HCP Mg-Li Alloy
C. Wang,Y. B. Xu,E. H. Han
Journal of Metallurgy , 2012, DOI: 10.1155/2012/674573
Abstract: Plastic instability is reported in hexagonal close-packed (HCP) LA41 magnesium alloy during tensile tests. Serration amplitude associated with plastic instability is measured to increase with increasing strain and decrease with increasing strain rate. The model of dynamic strain aging (DSA) is proposed to be the controlling mechanism. Moreover, it is reported that annealing could reduce the flow instability, which has potential practical applications. 1. Introduction Plastic instability associated with the production of Portevin-Le Chatelier (PLC) bands, which is also know as serrated flow or jerky flow, is a topic of current theoretical and engineering interest. Lots of studies in this area are on aluminum alloys; however, due to soaring research on magnesium alloys, similar results have been reported in Mg-Ag [1], Mg-Gd [2], Mg-Y-Nd [3], Mg-Nd [4], and Mg-Al-Zn [5, 6] alloys, respectively. Microscopically, plastic instability was believed to result from intensive interactions between mobile dislocations and solutes atoms. Cottrell [7] assumed that solute atoms had sufficient mobility to move with mobile dislocations and serrated flow was caused by the drag effect of solute atoms. However, other finding revealed that solute atoms were not expected to have such mobility [8]. Later investigations proposed that the dynamic strain aging (DSA) process during deformation might be the major controlling mechanism [9–14]. Recently, Picu [15] has suggested a new perspective by considering the effect of solute clusters, which are formed on forest dislocations, on the strength of dislocation junctions to shed more light on this long-lasting yet intriguing issue. Macroscopic features, such as spatiotemporal localization of plastic deformation and propagation of deformation bands, were also investigated systematically. Experimentally, Chmelík et al. [16] monitored in situ collective dislocation motion by acoustic emission (AE) and laser extensometry techniques. They concluded that nucleation and propagation of PLC bands were dominated by different dislocation processes. Shabadi et al. [17] and Zhang et al. [18] examined dynamics deformation bands by more sophisticated laser speckle technique. Dablij and Zeghloul [19] characterized the PLC effect by measuring deformation band strains and band propagation velocities. These macroscopic features are also explained theoretically. Particularly, Lebyodkin et al. [20] simulated localized deformation bands patterns by a discrete model based on statistical behavior of stress drops, while Ananthakrishna’s extended model [21]
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