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La, H.J.,Seo, S.H.,Lee, J.Y.,Lee, C.S.,Kim, B.H.,Srivastava, A.,Han, M.S.,Oh, H.M. Elsevier B.V 2016 Algal research Vol.17 No.-
<P>Maintaining a homogeneous cell suspension has been identified as a key parameter for higher biomass productivity of microalgae cultivation systems. This study proposes an alternative mixing method where microalgae are co-cultivated with loaches to improve the mixing efficiency and microalgal biomass productivity. The highly settleable microalga, Ettlia sp. showed a stable temporal cell concentration at the specified sampling sites when co-cultivated with 10 loaches, whereas it sank to the bottom of a 20 L rectangular vessel (20 cm deep) within 12 h in a water-pump-assisted mixing system. As a consequence of the better mixing efficiency in the co-cultivation system, biomass and lipid productivities of co-cultivation system were 66.9 +/- 8.3 mg/L/day and 14.7 +/- 1.0 mg/L/day, respectively, and were about 57.6% and 32.4% higher than the results from the water-pump-assisted mixing system. In addition, when the co-cultivation systems were cultured under various depth conditions (10, 16, 20, 40, 60, 80 cm deep) to determine the maximum areal biomass and lipid productivity, the system showed the highest biomass productivity with a depth of around 16-20 cm, while the lipid content and productivity were sharply lowered at this depth. The introduction of loaches also altered the microbial community structure of the co-cultivation systems. Therefore, these results suggest that the co-cultivation of loaches can be used as an efficient mixing method, while also introducing new ecological players, the loaches themselves and associated microorganisms, which can improve the sustainability of microalgae cultivation systems. (C) 2016 Elsevier B.V. All rights reserved.</P>
Optical and electro-catalytic studies of nanostructured thulium oxide for vitamin C detection
Singh, J.,Srivastava, M.,Roychoudhury, A.,Lee, D.W.,Lee, S.H.,Malhotra, B.D. Elsevier Sequoia 2013 Journal of alloys and compounds Vol.578 No.-
In this report, the nanostructured thulium oxide (Tm<SUB>2</SUB>O<SUB>3</SUB>) has been prepared using the hydrothermal process without using any template and further heat treatment. The crystalline structure and morphology of prepared sample have been determined by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM) and Fourier transform infrared (FTIR) spectroscopic techniques. The optical properties of prepared sample have been examined by ultra-violet (UV-Vis), photoluminescence (PL), Raman and X-ray photoelectron spectroscopy (XPS) studies. Furthermore, Tm<SUB>2</SUB>O<SUB>3</SUB> nanoparticles have been electrophoretically deposited (EPD) onto indium-tin-oxide (ITO) glass substrate and utilized for electro-oxidation of ascorbic acid (AA). The electro-catalytic behavior of Tm<SUB>2</SUB>O<SUB>3</SUB>/ITO and bare ITO electrodes for AA electro-oxidation has been studied by cyclic voltammetry. Catalytic oxidation peak current shows a linear dependence on the AA concentration and a linear calibration curve is obtained in the concentration range of 0.2-8mM of AA. The obtained results indicate that the nanostructured Tm<SUB>2</SUB>O<SUB>3</SUB> based electrode offers an efficient strategy and a new promising platform for application of the rare earth metal oxide material in electrochemistry and bioelectronics.
Ningombam, S.S.,Bagare, S.P.,Srivastava, A.K.,Sohn, B.J.,Song, H.J.,Larson, E. Pergamon Press ; Elsevier [distribution] 2014 Atmospheric environment Vol.98 No.-
Advection of anthropogenic aerosols from the Indo-Gangetic Plain (IGP) and dust aerosols from distant deserts towards a high-altitude station Merak, in the trans-Himalayan region are reported during June-July 2011. In order to differentiate the advection event, aerosol optical properties were examined during aged background conditions at the site. During the aged background conditions, aerosol optical depth (AOD at 500 nm) and Angstrom exponent (α) at the station were ~0.06 and 1.36, respectively which were increased to 0.13 and 1.62, respectively during the advection event. Further, a strong signature of fine-mode aerosol volume size distribution, dominated by absorbing aerosols, was observed during the advection event. The average atmospheric forcing during the aged background condition was found to be 0.57 Wm<SUP>-2</SUP> (with corresponding heating rate of 0.05 Kday<SUP>-1</SUP>) and these results were enhanced to 2.58 Wm<SUP>-2</SUP> (with corresponding heating rate of 0.22 Kday<SUP>-1</SUP>) during the advection event. The present study reveals that during the advection event, heating rate in the atmosphere was increased by about four times than the aged background condition. Such atmospheric warming in the region may influence the melting of the Himalayan glaciers and consequently it may effect the local atmospheric circulation.
STRUCTURE OF SOME CLASSES OF SEMISIMPLE GROUP ALGEBRAS OVER FINITE FIELDS
Makhijani, Neha,Sharma, Rajendra Kumar,Srivastava, J.B. Korean Mathematical Society 2014 대한수학회보 Vol.51 No.6
In continuation to the investigation initiated by Ferraz, Goodaire and Milies in [4], we provide an explicit description for the Wedderburn decomposition of finite semisimple group algebras of the class of finite groups G, such that $$G/Z(G){\simeq_-}C_2{\times}C_2$$, where Z(G) denotes the center of G.
Structure of some classes of semisimple group algebras over finite fields
Neha Makhijani,Rajendra Kumar Sharma,J. B. Srivastava 대한수학회 2014 대한수학회보 Vol.51 No.6
In continuation to the investigation initiated by Ferraz, Goo- daire and Milies in [4], we provide an explicit description for the Wed- derburn decomposition of finite semisimple group algebras of the class of finite groups G, such that G/Z(G) = C2 × C2, where Z(G) denotes the center of G.