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RISS 인기검색어
- 검색키워드
- 저자 : Sada, Koichi (검색결과 28 건)
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Sada, Koichi,Michioka, Takenobu,Ichikawa, Yoichi Korean Society for Atmospheric Environment 2008 Asian Journal of Atmospheric Environment (AJAE) Vol.2 No.1
A numerical simulation method has been developed to predict atmospheric flow and stack gas diffusion using a calculation domain of several km around a stack under complex terrain conditions containing buildings. The turbulence closure technique using a modified k-$\varepsilon$-type model under a non hydrostatic assumption was used for the flow calculation, and some of the calculation grids near the ground were treated as buildings using a terrain-following coordinate system. Stack gas diffusion was predicted using the Lagrangian particle model, that is, the stack gas was represented by the trajectories of released particles. The numerical model was applied separately to the flow and stack gas diffusion around a cubical building and to a two-dimensional ridge in this study, before being applied to an actual terrain containing buildings in our next study. The calculated flow and stack gas diffusion results were compared with those obtained by wind tunnel experiments, and the features of flow and stack gas diffusion, such as the increase in turbulent kinetic energy and the plume spreads of the stack gas behind the building and ridge, were reproduced by both calculations and wind tunnel experiments. Furthermore, the calculated profiles of the mean velocity, turbulent kinetic energy and concentration of the stack gas around the cubical building and the ridge showed good agreement with those of wind tunnel experiments.
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Sada Venkateswarlu,Manthrapudi Venu,Yenegu Veera Manohara Reddy,Bathinapatla Sravani,코두루말리카주나,윤민영,G. Madhavi 대한화학회 2019 Bulletin of the Korean Chemical Society Vol.40 No.6
A carbon paste electrode (CPE)/Cu nanowire (Cu NW)/poly(1-ethyl-3-methylimidazolium methyl sulfate) based sensor was successfully fabricated by the electro-polymerization of 1-ethyl-3-methylimidazolium methyl sulfate (EMIMS) onto the surface of Cu nanowires-modified carbon paste electrode. The morphology and chemical nature of Cu NWs were characterized by FTIR, FE-SEM, TEM, XRD techniques. The CPE/CuNWs/poly(EMIMS) showed an electrocatalytic activity toward the determination of etilefrine hydrochloride (ET-HCl) in the 0.11?M buffer solution of phosphate at pH 7.0. The CPE/CuNWs/poly(EMIMS) showed an excellent limit of detection (LOD) 2.3 ?M over the linear dynamic range of 0.1 to 1.3 ?M. The prepared CPE/CuNWs/poly(EMIMS) has exhibited high stability, good sensitivity, and low detection limit for the determination of ET-HCl. The validity of this advanced method was checked by applying in the blood plasma samples, with satisfactory results. This novel CPE/CuNWs/poly(EMIMS) can be an attractive material for the applications in biomedical and sensor fields.
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Ando, Sada,Ishida, M.,Oshio, S.,Tanaka, O. Asian Australasian Association of Animal Productio 2006 Animal Bioscience Vol.19 No.3
Silage is a major component of cattle rations, so the improvement of silage quality by the inoculation of lactic acid bacteria is of great interest. In this study, commercially distributed Lactobacillus plantram and Lactobacillus rhamnousas NGRI 0110 were used for ensilaging of guinea grass. The four treatments used were a control silage, a silage with cellulase addition, a silage with cellulose+L. plantram addition, and a silage with cellulose + NGRI 0110 addition. Silage quality, voluntary intake, nutrient digestibility, and the characteristics of ruminal fluid of wethers were investigated. Silage to which lactic acid bacteria were added showed low pH and acetic acid concentration and the highest lactic acid content. Dry matter and organic matter digestibility were significantly (p<0.05) increased by cellulase addition and significantly (p<0.05) higher values were observed in L. plantram- and NGRI 0110-added silage. Voluntary intake of NGRI 0110-added silage was the highest and that of control silage was the lowest. We concluded that the observed ability of NGRI 0110 to tolerate low pH and to continue lactic acid fermentation in high lactic acid concentration had also occurred in actual ensilaging. The results indicate that the addition of lactic acid bacteria might improve silage quality and increase digestibility and voluntary intake. The potential for improvement by NGRI 0110 was higher than that to be gained by the use of commercially available lactic acid bacteria.
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Venkateswarlu, Sada,Yoon, Minyoung American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.45
<P>Heavy metal ion removal from wastewater constitutes an important issue in the water treatment industry. Although a variety of nanomaterials have been developed for heavy metal removal via adsorption, the adsorption capacity, removal efficiency, and material recyclability still remain a challenge. Here, we present novel Fe<SUB>3</SUB>O<SUB>4</SUB>@DAPF core–shell ferromagnetic nanorods (CSFMNRs) for the removal of Pb(II) from aqueous solutions; they were prepared by the facile surface modification of twin-like ferromagnetic Fe<SUB>3</SUB>O<SUB>4</SUB> nanorods using a 2,3-diaminophenol and formaldehyde (DAPF)-based polymer. The crystallinity and structure of the Fe<SUB>3</SUB>O<SUB>4</SUB> nanorods were confirmed via X-ray diffraction (XRD). Transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) revealed the core–shell morphology and composition of the materials. Pb(II) removal using the prepared Fe<SUB>3</SUB>O<SUB>4</SUB>@DAPF CSFMNRs was assessed, and comparable adsorption capacities (83.3 mg g<SUP>–1</SUP>) to the largest value were demonstrated. A thermodynamic study of the adsorption clearly indicated that the adsorption was exothermic and spontaneous. Due to the ferromagnetic properties with a high saturation magnetization value (56.1 emu g<SUP>–1</SUP>) of the nanorods, the nanorods exhibited excellent reusability with one of the fastest recovery times (25 s) among reported materials. Therefore, the Fe<SUB>3</SUB>O<SUB>4</SUB>@DAPF CSFMNRs can serve as recyclable adsorbent materials and as an alternative to commonly used sorbent materials for the rapid removal of heavy metals from aqueous solutions.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2015/aamick.2015.7.issue-45/acsami.5b07723/production/images/medium/am-2015-07723v_0016.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5b07723'>ACS Electronic Supporting Info</A></P>
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Venkateswarlu, Sada,Yoon, Minyoung The Royal Society of Chemistry 2015 Dalton Transactions Vol.44 No.42
<P>Mercury is considered one of the most notorious global pollutants due to its high toxicity and widespread use in industry. Although many materials have been developed for the removal of mercury for water purification, most of these materials are difficult to reuse, which may lead to an increase in the mercury handling expense. Therefore, new sustainable materials that can be easily recycled and are highly efficient for the removal of mercury are required. Herein, we report the surfactant-free green synthesis of Fe<SUB>3</SUB>O<SUB>4</SUB> magnetic nanoparticles (MNPs) using a watermelon (<I>Citrullus lanatus</I>) rind extract. The Fe<SUB>3</SUB>O<SUB>4</SUB> MNPs were further functionalized with 3,4-dihydroxyphenethylcarbamodithioate (DHPCT) and applied to the removal of Hg(<SMALL>II</SMALL>). Evaluation of the mercury removal efficiency and the amount adsorbed by DHPCT@Fe<SUB>3</SUB>O<SUB>4</SUB> MNPs demonstrated a high Hg(<SMALL>II</SMALL>) removal efficiency (98%) with a maximum Hg(<SMALL>II</SMALL>) adsorption capacity of 52.1 mg g<SUP>−1</SUP>. Systematic studies of the adsorption mechanism and selectivity suggest that the soft ligand (DHPCT) can preferentially coordinate with the soft metal ion (Hg(<SMALL>II</SMALL>)) resulting in selective mercury removal. The developed DHPCT@Fe<SUB>3</SUB>O<SUB>4</SUB> MNPs were readily recycled several times using an external magnet by exploiting their ferromagnetic character, without a significant decline in the Hg(<SMALL>II</SMALL>) removal efficiency. This study provides a new insight into the preparation of a highly efficient adsorbent for Hg(<SMALL>II</SMALL>) removal by an eco-friendly method.</P> <P>Graphic Abstract</P><P>A 3,4-dihydroxyphenethylcarbamodithioate capped biogenic Fe<SUB>3</SUB>O<SUB>4</SUB> magnetic nanocomposite has been synthesized using a watermelon rind extract for the removal of Hg(<SMALL>II</SMALL>) ions with a facile recyclability. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c5dt03155a'> </P>
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Venkateswarlu, Sada,Viswanath, Buddolla,Reddy, Ankireddy Seshadri,Yoon, Minyoung Elsevier 2018 Sensors and actuators. B, Chemical Vol.258 No.-
<P><B>Abstract</B></P> <P>Herein, we present a sustainable solvent-free synthetic procedure to produce carbon nanodots from common edible mushrooms (<I>Pleurotus</I> spp.). The resulting mushroom carbon nanodots (MCDs) exhibit stable blue fluorescence with high quantum yield (25%). The MCDs are highly dispersible in water because of the enormous number of oxygen- and nitrogen-containing functional groups on the surface. The MCDs can be used as an effective fluorescent probe for label-free detection of Hg<SUP>2+</SUP> ions (detection limit: 4.13nM). To improve the sensitivity, dihydrolipoic acid was attached to the surface of MCDs, resulting in ultra-sensitivity in Hg<SUP>2+</SUP> ion sensing, with a detection limit as low as 17.4 pM. In addition, the MCDs can be used for the labeling of bacteria and as a photoinduced bactericidal agent. Light irradiation of <I>E. coli</I> treated with MCDs showed excellent bactericidal activity relative to the control. These sustainable and affordable carbon materials are potentially compatible for monitoring toxic metals and as a potent visible-light-responsive bactericidal probe.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A facile chemical free synthesis of carbon nanodots using mushrooms </LI> <LI> Temperature dependent synthesis study for high yield of carbon nanodots </LI> <LI> Very stable MCDs with easy functionalization with DHLA under benign conditions </LI> <LI> Ultrahigh sensitive detection of Hg<SUP>2+</SUP> ions with a detection limit as low as 17.4 pM </LI> <LI> Excellent photo-induced reactive oxygen species generation and bactericidal activity </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Ando, Sada,Nishiguchi, Y.,Hayasaka, K.,Iefuji, H.,Takahashi, J. Asian Australasian Association of Animal Productio 2006 Animal Bioscience Vol.19 No.6
Candida utilis can assimilate fatty acids, so it was hypothesized that the treatment of rice by Candida utilis would improve feed quality by reducing fat content and adding the yeast function that would stimulate rumen microbes. In this study, the oil assimilation ability of Candida utilis IFO1086, 0988, 0626 and the effect of treatment of Candida utilis IFO1086, IFO0626 on the nutrient contents of rice bran were examined. The effect of Candida utilis addition on the in vitro degradability of forage was also investigated. It was found that the oil assimilating ability of IFO1086 and IFO0626 was significantly (p<0.01) higher than that of IFO0988. Candida utilis treatment reduced the EE content and increased the CP, ADF and NDF percentage. The absolute amount of ether extract was decreased by 35.9% in IFO1086 and IFO0626 treatment. The absolute amount of crude protein was not changed by yeast treatment. The ADF and NDF amounts were increased. The addition of Candida utilis increased in vitro forage degradability significantly (p<0.05). Based on these results it can be postulated that treatment of rice bran by Candida utilis may improve feed quality by reducing fat content, increasing the CP content and adding the function of yeast for stimulating rumen microbes.
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Nabil B. Sada,Mohammed A. Al Nawafleh 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.8
Round bars of 13.6 mm diameter made from low alloy steel were sprayed by hard-coating Lubrotec 19985 under the following spraying parameters: the rotation speed varied from 500 to 900 rpm, the feeding speed from 0.1 to 1.0 mm/rev, and the nozzle tip distance from 100 to 200 mm; the sprayed bars were then subjected to bending test. Depending on the thickness of the produced coating, the modulus of elasticity and yield bending stress of the coating were calculated by applying the bending deflection formula and an equivalent cross-sectional area technique, respectively. The results obtained indicated that the thickness, hardness, yield bending stress, and modulus of the elasticity of coating were varied with the variation in spraying parameters. The optimum spraying parameter was a rotation speed of 700 r.p.m, a nozzle tip distance of 200 mm, and a feed rate of 0.1 mm/rev. This optimum parameter produced an acceptable thickness of 1.14 mm, a hardness of 148 HV, a bending stress of 404.9 MPa, and a modulus of elasticity of 91.47 GPa. The results obtained can also help determine the modulus of elasticity and yield bending stress of the various coating materials when a coated round bar is subjected to the bending test.
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