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Arunkumar, S.,Hou, Tianfeng,Kim, Young-Bae,Choi, Byungchul,Park, Su Han,Jung, Seunghun,Lee, Dong-Weon Elsevier 2017 Sensors and actuators. B Chemical Vol.243 No.-
<P><B>Abstract</B></P> <P>A highly selective and sensitive gas sensing material was prepared by decorating gold (Au) nanoparticles on zinc oxide <I>(ZnO)</I> nanostructure. First, zinc oxide architectures were synthesised through facile one-pot hydrothermal synthesis route by using zinc acetate as the metal precursors, ethanolamine as the organic Lewis base and water as the reaction medium. The versatile zinc oxide architectures such as (i) nanostars <I>(ZNS)</I>, (ii) marigold flower <I>(ZMF)</I>, (iii) nanorods assembled flower <I>(ZNF)</I> and (iv) nanorods <I>(ZNR)</I> were successfully synthesised by the controlled variation of the reaction medium mole ratio. The crystal structure and morphological evaluation of the as prepared material were investigated in detail by several analytical techniques, and the findings are consistent with each other. The carbon monoxide (CO) sensing ability of the as prepared materials was carried out at different sensing temperature (Ts≤300°C) and at different gas concentration (5–1000 <I>ppm</I>). Gas sensing study clearly shows that the sensor responses are found to be morphology and surface area dependent. Among all the zinc oxide nanostructures, nanostars exhibits excellent sensitivity (S<SUB>R</SUB> ∼31 toward 5 <I>ppm</I>) at the optimized sensing temperature of 275°C. Further, to improve the sensing characteristics and to reduce the operating temperature, different wt% of gold nanopartilces were decorated on the surface of zinc oxide nano-stars by solution impregnation technique. Surface decoration of only 3wt% gold nanoparticles incorporated zinc oxide nanostars exhibits enhanced sensing response (S<SUB>R</SUB> ∼15 toward 50 <I>ppm</I>) at 35°C with an excellent response (Γ<I> <SUB>RES</SUB> </I> ∼8s) and recovery (Γ<I> <SUB>REC</SUB> </I> ∼15s) time. Sensor also posses excellent selectivity toward CO compare to other interfering gases such as methanol, ethanol, acetone and hydrogen.</P>
Asymmetric Synthesis of (−)-6′-β-Fluoro-aristeromycin via Stereoselective Electrophilic Fluorination
Kim, Gyudong,Yoon, Ji-seong,Jarhad, Dnyandev B.,Shin, Young Sup,Majik, Mahesh S.,Mulamoottil, Varughese A.,Hou, Xiyan,Qu, Shuhao,Park, Jiyong,Baik, Mu-Hyun,Jeong, Lak Shin THE AMERICAN CHEMICAL SOCIETY 2017 ORGANIC LETTERS Vol.19 No.21
<P>(-)-6 '-beta-Fluoro-aristeromycin (2), a potent inhibitor of S-adenosylhomocysteine (AdoHcy) hydrolase, has been synthesized via stereoselective electrophilic fluorination followed by a purine base build-up approach. Interestingly, purine base condensation using a cyclic sulfate resulted in a synthesis of (+)-5 '-beta-fluoro-isoaristeromycin (2a). Computational analysis indicates that the fluorine atom controlled the regioselectivity of the purine base substitution.</P>
Lee, Y.W.,Kim, B.S.,Hong, J.,Choi, H.,Jang, H.S.,Hou, B.,Pak, S.,Lee, J.,Lee, S.H.,Morris, S.M.,Whang, D.,Hong, J.P.,Shin, H.S.,Cha, S.,Sohn, J.I.,Kim, J.M. Elsevier 2017 Nano energy Vol.37 No.-
<P>Pseudo-capacitive transition metal chalcogenides have recently received considerable attention as a promising class of materials for high performance supercapacitors (SCs) due to their superior intrinsic conductivity to circumvent the limitations of corresponding transition metal oxides with relatively poor conductivity. However, the important challenge associated with the utilization of such high-capacitive electrode materials is the development of desirably structured electrode materials, enabling efficient and rapid Faradaic redox reactions and ultra long-term cycling. Here, we propose a hierarchically integrated hybrid transition metal (Cu-Ni) chalcogenide shell-core-shell (HTMC-SCS) tubular heterostructure using a facile bottom-up synthetic approach. The resultant HTMC-SCS electrode exhibits a high volumetric capacitance of 25.9 F cm(-3) at a current density of 2 mA cm(-2). Furthermore, asymmetric SCs based on an HTMC-SCS heterostructured electrode demonstrate a high power density (770 mW cm(-3)) and an energy density (2.63 mW h cm(-3)) as well as an ultrahigh reversible capacity with a capacitance retention of 84% and a long-term cycling stability of over 10,000 cycles. Based on experimental results and density functional theory calculations, these remarkably improved electrochemical features are discussed and explained in terms of the unique combination of the conductive CuS core and active NiS shell materials, hierarchical tubular open geometry with nanoscale inner/outer shell structure, and mechanical stress-mitigating interlayer on shell-core-shell interface, allowing highly reversible and efficient electrochemical redox processes coupled with fast charge transfer kinetics and an electrochemically stable structure.</P>
Hou, W.X.,Cheng, S.Y.,Liu, S.T.,Shi, B.M.,Shan, A.S. Asian Australasian Association of Animal Productio 2014 Animal Bioscience Vol.27 No.10
This experiment was conducted to investigate the effects of dietary supplementation of magnesium sulfate ($MgSO_4$) during late gestation and lactation on sow and litter performance, fecal moisture, blood biochemistry parameters, immunoglobulin levels and milk composition in sows. Forty-eight sows ($Yorkshire{\times}Landrace$, 4th to 5th parity) were randomly allocated to 1 of 4 dietary treatments supplemented with 0, 200, 400, or 600 mg/kg $MgSO_4$ (n = 12). The experiment started on day 90 of gestation and continued through day 21 of lactation. Blood samples were collected on day 107 of gestation, day 0 (farrowing) and 21 (weaning) of lactation for the analyses of the blood biochemistry parameters and immunoglobulin levels. The colostrum and milk samples were obtained on day 0 and 14 of lactation, respectively. Fecal samples were collected from the sows on day 107 of gestation as well as day 7 and 20 of lactation to determine fecal moisture content. The results showed that the survival percentage of piglets and the litter weight at weaning were decreased linearly (p<0.05) and other parameters of the sow or litter performance were not influenced (p>0.05) by $MgSO_4$ supplementation. The fecal moisture content of the sows were increased (p<0.05) linearly as dietary $MgSO_4$ increased on day 7 and 20 of lactation. Supplementation with $MgSO_4$ increased the plasma magnesium (Mg) level linearly (p<0.05) and had a trend to increase total protein level (p>0.05 and p<0.10). However, an increase in the dietary $MgSO_4$ level resulted in a linear decrease in the colostrum fat content (p<0.05). Dietary $MgSO_4$ supplementation enhanced the immunoglobulin G (IgG) level (linear, p<0.05) in plasma on day of farrowing and immunoglobulin A (IgA) level in colostrum (quadratic, p<0.05) and milk (linear, p<0.05) of the sows. These results indicated that supplementation with $MgSO_4$ during late gestation and lactation may have the potential to prevent sow constipation, but may also result in some negative effects.
PacCAF: a Grid Portal in Pacific Asia for the CDF Experiment
S. Hou,T. L. Hsieh,P. K. Teng 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.5
We present the PacCAF (Pacific CDF Analysis Farm) computing model for the CDF (Collider Detector at Fermilab) experiment. The PacCAF is a portal for job submission to a pool of computing nodes collected from the LCG (LHC Computing Grid) and the OSG (Open Science Grid) sites in the Pacific Asia region. It has a suit of services for user authentication, software distribution, and network connection to worker nodes. It also provides a web-based online monitoring system for the status of batch jobs and the processes running on worker nodes. The PacCAF architecture is modular and is easy to modify. We discuss the upgrade from being a dedicated local cluster to joining shared resources in a Grid computing environment. We present the PacCAF (Pacific CDF Analysis Farm) computing model for the CDF (Collider Detector at Fermilab) experiment. The PacCAF is a portal for job submission to a pool of computing nodes collected from the LCG (LHC Computing Grid) and the OSG (Open Science Grid) sites in the Pacific Asia region. It has a suit of services for user authentication, software distribution, and network connection to worker nodes. It also provides a web-based online monitoring system for the status of batch jobs and the processes running on worker nodes. The PacCAF architecture is modular and is easy to modify. We discuss the upgrade from being a dedicated local cluster to joining shared resources in a Grid computing environment.
S.M. Pawar,B.S. Pawar,Bo Hou,A.T.A. Ahmed,H.S. Chavan,조용철,조상근,김종민,서지우,차승남,A. I. Inamdar,김형상,임현식 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.69 No.-
High-density CuCo2O4 nanosheets are grown on Ni foam using electrodeposition followed by airannealing for a Li-ion battery anode. The anode exhibits a high discharge capacity of 1244 mAh/g at 0.1 A/g (82% coulombic efficiency) and excellent high-rate performance with 95% capacity retention(1100 mAh/g after 200 cycles at 1 A/g). The outstanding battery performance of the CuCo2O4 anode isattributed to its binder-free direct contact to the current collector and high-density nanosheetmorphology. The present experimentalfindings demonstrate that the electrodeposited binder-freeCuCo2O4 material may serve as a safe, low-cost, long-cycle life anode for Li-ion batteries.
Pawar, S.M.,Pawar, B.S.,Hou, Bo,Ahmed, A.T.A.,Chavan, H.S.,Jo, Yongcheol,Cho, Sangeun,Kim, Jongmin,Seo, Jiwoo,Cha, SeungNam,Inamdar, A.I.,Kim, Hyungsang,Im, Hyunsik Elsevier 2019 Journal of industrial and engineering chemistry Vol.69 No.-
<P><B>Abstract</B></P> <P>High-density CuCo<SUB>2</SUB>O<SUB>4</SUB> nanosheets are grown on Ni foam using electrodeposition followed by air annealing for a Li-ion battery anode. The anode exhibits a high discharge capacity of 1244mAh/g at 0.1A/g (82% coulombic efficiency) and excellent high-rate performance with 95% capacity retention (1100mAh/g after 200 cycles at 1A/g). The outstanding battery performance of the CuCo<SUB>2</SUB>O<SUB>4</SUB> anode is attributed to its binder-free direct contact to the current collector and high-density nanosheet morphology. The present experimental findings demonstrate that the electrodeposited binder-free CuCo<SUB>2</SUB>O<SUB>4</SUB> material may serve as a safe, low-cost, long-cycle life anode for Li-ion batteries.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Synthesis of high-density CuCo<SUB>2</SUB>O<SUB>4</SUB> nanosheets via electrodeposition method. </LI> <LI> CuCo<SUB>2</SUB>O<SUB>4</SUB> nanosheet electrode exhibits a high discharge capacity of 1244mAh/g at 0.1A/g. </LI> <LI> Excellent rate capability and stability with 95% capacity retention after 200 cycles. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>