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Choice of dispersants for the nano-apatite filler of polylactide-matrix composite biomaterial
C. Deng,J. Weng,Q.Y. Cheng,S.B. Zhou,X. Lu,J.X. Wan,S.X. Qu,B. Feng,X.H. Li 한국물리학회 2007 Current Applied Physics Vol.7 No.6
The aim of this study is to compare de-aggregative ability of common organic dispersants for the acicular nano-apatite crystallite withmain composition of calcium hydroxyapatite (HA) as a ller of composite containing polylactide (PLA) matrix. Firstly, the acicularnano-apatite powders with an average length of 70120 nm were synthesized based on traditional chemical co-precipitation andfreeze-drying techniques. Common organic dispersants including tetrahydrofuran, acetone, chloroform,N,N-dimethyl formamideiments showed that nano-apatite suspension dispersed by DMF and ethanol presented homogeneous and stable colloid after vigorly stir-red for 24 h and then kept still for same time, respectively. Results of particle measurements and viscosity measurement illuminated that alarge number of the nano-apatite particles with an average dimension of 297.86 nm and viscosity of 0.8872 cP in DMF suspension couldbe dispersed up to 91.28 nm by the DMF dispersant and the DMF dispersant could minimize agglomeration between the apatite ultra-furan, acetone and ethanol, when the nano-apatite/PLA composite biomaterials were prepared.
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.
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.
Microstructure and Tensile Properties of Tungsten Heavy Alloys
Islam S.H.,Qu X.H.,Akhtar F.,Feng P.Z.,Hea X.B. 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
The main object of this research was to examine the effect of sintering conditions on the microstructure of tungsten heavy alloys and how the resulting modification of the microstructure can be used to optimize their mechanical properties. Alloys composed of 88%, 93% and 95% wt. of tungsten and the balance is Ni: Fe in the ratio of 7:3 were sintered at different temperatures for different sintering holding times in hydrogen atmosphere. It was shown that the mechanical properties of the alloys, and especially their ductility, are harmed when tungsten grains are contiguous.
Effects of azide on electron transport of exoelectrogens in air-cathode microbial fuel cells
Zhou, X.,Qu, Y.,Kim, B.H.,Choo, P.Y.,Liu, J.,Du, Y.,He, W.,Chang, I.S.,Ren, N.,Feng, Y. Elsevier Applied Science 2014 Bioresource technology Vol.169 No.-
The effects of azide on electron transport of exoelectrogens were investigated using air-cathode MFCs. These MFCs enriched with azide at the concentration higher than 0.5mM generated lower current and coulomb efficiency (CE) than the control reactors, but at the concentration lower than 0.2mM MFCs generated higher current and CE. Power density curves showed overshoot at higher azide concentrations, with power and current density decreasing simultaneously. Electrochemical impedance spectroscopy (EIS) showed that azide at high concentration increased the charge transfer resistance. These analyses might reflect that a part of electrons were consumed by the anode microbial population rather than transferred to the anode. Bacterial population analyses showed azide-enriched anodes were dominated by Deltaproteobacteria compared with the controls. Based on these results it is hypothesized that azide can eliminate the growth of aerobic respiratory bacteria, and at the same time is used as an electron acceptor/sink.
Hwang, Y.S.,Qu, X.,Li, Q. Pergamon Press ; Elsevier Science Ltd 2013 Carbon Vol.55 No.-
The photochemical transformation of carboxylated multiwall carbon nanotubes (COOH-MWCNTs) in water and the subsequent impact on their aggregation and deposition behaviors were examined. The photochemical transformation of COOH-MWCNTs was investigated under UVA (300-400nm) irradiation, the main component of UV light in solar irradiation. Time-resolved dynamic light scattering measurement and quartz crystal microbalance with dissipation monitoring were used to study the initial aggregation and deposition kinetics. Characterization of the physicochemical properties of the COOH-MWCNTs before and after irradiation revealed a loss in surface oxygen after UV irradiation, most likely a result of decarboxylation of the nanotube surface. These changes in surface chemistry greatly reduced the colloidal stability of COOH-MWCNTs in NaCl solutions. No noticeable changes in particle surface zeta potential and stability were observed in CaCl<SUB>2</SUB> solutions after irradiation. Consistent with the decreased colloidal stability in NaCl solutions, the irradiated COOH-MWCNTs had a notably higher deposition than the initial COOH-MWCNTs in NaCl solutions when aggregation did not occur. Our results suggest that the photochemical transformation plays an important role in the transport of carbon nanotubes in natural aquatic systems.
Optical Nanostructures Fabricated by SU-8 based Nanoimprint Lithography
R. Liu,B.-R. Lu,S.-Q. Xie,J. Wan,Z. Shu,X.-P. Qu,Y. Chen 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.3
The high resolution low-cost and high-volume nano-pattering capability of the nanoimprint lithography (NIL) and the high optical transmittance of SU-8 in the infrared, the visible and the near-UV light ranges have enabled us to apply the SU-8 based NIL to produce various optical nanostructures. We fabricated dielectric and metallic gratings of various groove density (1000 – 5000 lines/mm) in a relatively large area (10 mm × 10 mm) and planar chiral photonic meta-material structure in SU-8 with periods of both 600 nm and 4 μm. We also designed and successfully fabricated distributed Bragg reflectors (DBRs) with Si/SiO2/SU8/air structures Optical measurements of the SU-8 based nanostructures showed good optical performance and interesting properties, and the experimental data agree reasonably well with simulation results. The high resolution low-cost and high-volume nano-pattering capability of the nanoimprint lithography (NIL) and the high optical transmittance of SU-8 in the infrared, the visible and the near-UV light ranges have enabled us to apply the SU-8 based NIL to produce various optical nanostructures. We fabricated dielectric and metallic gratings of various groove density (1000 – 5000 lines/mm) in a relatively large area (10 mm × 10 mm) and planar chiral photonic meta-material structure in SU-8 with periods of both 600 nm and 4 μm. We also designed and successfully fabricated distributed Bragg reflectors (DBRs) with Si/SiO2/SU8/air structures Optical measurements of the SU-8 based nanostructures showed good optical performance and interesting properties, and the experimental data agree reasonably well with simulation results.