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Zuo, Yi,Wang, Yaonan,Huang, Lihong,Li, Chunsheng Korean Mathematical Society 2009 대한수학회지 Vol.46 No.5
This paper considers the problem of existence and exponential stability of almost periodic solution for shunting inhibitory cellular neural networks with distributed delays and large impulses. Based on the contraction principle and Gronwall-Bellman's inequality, some sufficient conditions are obtained. The results of this paper are new and they complement previously known results.
Re-evaluating Service Trade from the Perspective of Service Intermediates in the Chinese Economy
Zuoyi Ye,이진면 한국경제연구학회 2023 Korea and the World Economy Vol.24 No.2
With rapid economic development and social progress, the service sector now accounts for an increasing proportion of the national economy. However, the available trade statistics appear to underestimate the sector’s contributions. From the perspective of trade in service intermediates, this study examines the export trade of manufactured goods of embodied service intermediates using Chinese input-output tables from 2007 to 2017. The study finds that direct service industry exports are relatively small, and that the contribution of services is principally represented by indirect, implicit exports of the manufacturing sector. While analyzing, it was observed that the scale of intermediate trade in services was significantly larger than that of direct trade. Based on industry, wholesale and retail sales, electric power, transportation, finance, business services, scientific research, and technical services accounted for a large proportion of trade in services as a whole.
Xiao, ZuoYi,Wang, Anjie,Perumal, Jayakumar,Kim, Dong-Pyo WILEY-VCH Verlag 2010 Advanced Functional Materials Vol.20 No.9
<P>Monolithic 3D porous silica structures are fabricated into a multilayer framework with a bimodal pore size distribution in the micrometer and sub-micrometer range. The fabrication – which involves directed assembly of colloidal spheres, transfer printing, and removal of a sacrificial template – yields robust and mechanically stable structures over a large area. The structure becomes monolithic upon pyrolyzing the stacked layers, which induces necking of the particles. The monolithic microstructures can easily be embedded in microchannels with the aid of photolithography, leading to the formation of a microfluidic system with a built-in microstructure in a site- and shape-controlled manner. Utilization of the system results in a fourfold increase in the mixing efficiency in the microchannel.</P> <B>Graphic Abstract</B> <P>Monolithic 3D porous silica microstructures with bimodal pore size distribution are successfully fabricated. Necking the silica beads at the pyrolytic step yields a robust and mechanically stable microstructure over an area of 10 cm<SUP>2</SUP>. This 3D microstructure is easily embedded into microchannels via a photolithographic technique, leading to a good improvement in the mixing performance of the channels. <img src='wiley_img_2010/1616301X-2010-20-9-ADFM200902164-content.gif' alt='wiley_img_2010/1616301X-2010-20-9-ADFM200902164-content'> </P>
3D macroporous SiCN ceramic patterns tailored by thermally-induced deformation of template
Xiao, ZuoYi,Wang, Anjie,Kim, Dong-Pyo Royal Society of Chemistry 2010 Journal of materials chemistry Vol.20 No.14
<P>Three-dimensional (3D) macroporous SiCN ceramic patterns with tailored window size and pore shape were fabricated by thermal deformation of a close-packed polystyrene (PS) sphere template, which was obtained by applying consecutive capillary force and centrifugation in a packing process of a few hours. Subsequent infiltration of a viscous preceramic inorganic polymer under strong centrifugal force was followed by pyrolysis at 800 °C to decompose the sacrificial PS sphere-packed template. In this work, the window sizes among the interconnected macropores were controlled in the range of 258 to 740 nm by tailoring the shape of the packed PS spheres (diameter 1.5 μm) by annealing above the glass transition temperature (<I>T</I><SUB>g</SUB>) of the PS spheres for different periods. The pore shapes changed from circular to hexagonal, and the BET surface area of the samples was reduced from 443 to 337 m<SUP>2</SUP> g<SUP>−1</SUP> with a thinner network skeleton. This approach should be useful in combining a low pressure drop with high external surface area for microfluidic applications with 3D porous structures.</P> <P>Graphic Abstract</P><P>A facile method was developed to fabricate 3D macroporous SiCN ceramic patterns with tailored window size and pore shape, by annealing close-packed PS spheres at 110 °C for 30–120 min to induce shape deformation of the PS spheres, followed by preceramic polymer infiltration and pyrolytic conversion at 800 °C. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b920627b'> </P>
Xiao, ZuoYi,Zhao, Yun,Wang, Anjie,Perumal, Jayakumar,Kim, Dong-Pyo Royal Society of Chemistry 2011 Lab on a chip Vol.11 No.1
<P>We present a low cost and practical approach to integrate 3D ordered macroporous polyfluoropolyether (PFPE) patterns into a microchannel by a series of porous pattern fabrication processes and subsequent photolithography in a site- and shape-selective manner. The 3D ordered macroporous patterns with high-resolution edges were firstly fabricated by microtransfer molding (μ-TM) of the sacrificial polystyrene (PS) template infiltrated with PFPE as a non-adhesive and solvent-resistant skeletal material. The resulting robust PFPE porous structures with high solvent resistance on a silicon wafer can easily be embedded into the microchannel with the aid of conventional photolithography, leading to a microfluidic system with a built-in microstructure. Moreover, catalytic Pd nanoparticles implanted on the surface of the porous structure were obtained by use of Pd nanoparticle deposited PS spheres, the porous structure embedded channel was utilized to perform a Suzuki coupling reaction.</P> <P>Graphic Abstract</P><P>A 3D ordered macroporous pattern embedded microchannel, fabricated by conventional microtransfer molding and photolithography techniques, was used as a catalytic microreactor. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0lc00108b'> </P>
Xun-an Ning,Chongyang Yang,Yujie Wang,Zuoyi Yang,Jingyu Wang,Ruijing Li 한국생물공학회 2014 Biotechnology and Bioprocess Engineering Vol.19 No.4
A strict aerobic Acinetobacter baumanniiYNWH 226, isolated from an activated sludge reactortreating textile wastewater, was able to grow on Congo redas the sole carbon source under aerobic conditions. Thedecolorization and TOC reduction efficiency were 99.1 and93.72%, respectively. The effects of the Congo redconcentration were studied. The environmental factors (i.e.,pH, temperature and agitation speed) on the biodegradationof Congo red in aqueous phase were studied and evaluatedusing response surface methodology. The results indicatedthat when the Congo red concentration was 100 mg/L, theoptimal decolorization conditions were as follows: 37°C,pH 7.0 and 180 rpm. The single A. baumannii YNWH 226was able to form aromatic amines by reductive breakage ofthe azo bond and then oxidize them into non-toxicmetabolites.