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Infrared photoluminescence from lead sulfide quantum dots in glasses enriched in sulfur
Han, N.,Liu, C.,Zhang, J.,Zhao, X.,Heo, J.,Jiang, Y. North-Holland 2014 Journal of non-crystalline solids Vol.391 No.-
Formation of PbS QDs in the glasses containing a small amount of lead oxide was examined. Oversaturation of sulfur only was sufficient to promote the formation of PbS QDs in the glasses. Upon thermal treatment, absorption of PbS QDs was tuned from 824nm to 2213nm. Infrared photoluminescence, especially, mid-infrared photoluminescence from PbS QDs was observed in the range of 1008nm to 2182nm. Ostwald ripening of PbS QDs occurred when the heat-treatment temperature was 530<SUP>o</SUP>C or 540<SUP>o</SUP>C, and led to the decrease in the absorption coefficients and splitting of the photoluminescence bands.
Han, N.,Mizan, Md.F.R.,Jahid, I.K.,Ha, S.D. Butterworths ; Taylor Francis ; Elsevier Science 2016 FOOD CONTROL Vol.70 No.-
<P>Vibrio parahaemolyticus is recognized as a human foodborne pathogen that is mostly associated with seafood. This pathogen can form a mature biofilm on food and food contact surfaces during food processing. The present study investigated V. parahaemolyticus biofilm formation at various temperatures on shrimp, crab, and stainless steel coupons, using the biofilm formation index (BFI) method on microtiter plates. The results were also confirmed by field emission scanning electron microscopy. Both the BFI values and cultural counts revealed that V. parahaemolyticus biofilm formation was stronger at higher temperatures than at lower temperatures. Biofilm formation differed according to the growth surface type and growth temperature. It was found that higher temperatures (15-37 degrees C) induced stronger biofilm formation whereas 4 and 10 degrees C resulted in attachment of the bacterial cells as monolayers. It could be concluded that temperatures of 25-37 degrees C result in significantly stronger biofilm formation as well as exoprotease and AI-2 production on food and food contact surfaces, indicating that these temperatures might be threatening conditions for food safety. (C) 2016 Published by Elsevier Ltd.</P>
Han, N.,Park, Y. J.,Han, M.,Ryu, B. D.,Ko, K. B.,Chandramohan, S.,Choi, C. J.,Cuong, T. V.,Hong, C. H. Elsevier Science B.V., Amsterdam. 2014 Materials letters Vol.123 No.-
dramatic reduction in threading dislocation density and stress-relaxation was simultaneously achieved in GaN epilayer using a silica nanosphere embedded structure on V-groove patterned sapphire substrate by metal-organic chemical vapor deposition. By depositing silica nanospheres at two different instances during a growth process, a two-step growth that included selective area growth and lateral overgrowth was initiated. This approach led to GaN template of high crystal quality, which was confirmed from x-ray diffraction rocking curve and micro-Raman measurements and further corroborated by transmission electron microscopy. GaN light-emitting diode fabricated by this strategy showed a significant enhancement in the light output power. (C) 2014 Elsevier B.V. All rights reserved.
Cultural Diffusion, Adoption and Adaptation - Motifs and Patterns in Indonesian Textiles -
Hann, Michael A. The Costume Culture Association 2009 Fashion, industry and education Vol.12 No.1
The objectives of the research are to explain the nature of cultural diffusion and its associated theoretical concepts, to review the nature of traditional Indonesian textiles and to focus particular attention on the origin, evolution and diffusion of motifs and patterns associated with the decoration of two important categories of Indonesian textiles: batiks and ikats. Cultural diffusion refers to the process by which cultural traits, material objects, ideas, inventions, innovations or patterns of behaviour are spread from one social or geographical context to another. Examining the decoration on traditional textiles produced across the Indonesian archipelago, certain motifs and patterns are shown to have been retained from ancient times, and others have been adopted from elsewhere. There is great cultural diversity across the archipelago and ample evidence of cultural diffusion.
제올라이트 분리막: 조성 변경을 통한 분리막 성질의 조절
Hannes Richter,Marcus Weyd,Adrian Simon,Jan-Thomas Kühnert,Christiane Günther,Ingolf Voigt,Alexander Michaelis 한국막학회 2017 멤브레인 Vol.27 No.6
분리막을 이용한 분리 기술은 에너지 소요가 적다. 제올라이트를 기반으로 제작한 분리막의 경우, 결정 구조 내에 작은 분자 크기의 기공을 갖고 있어 이를 이용하여 가혹한 조건에서도 분리가 가능하기 때문에, 그 관심도가 높다. NaA (LTA 유형의 제올라이트) 제올라이트의 경우, 산업적으로 유기 용매에서 수분을 제거하는 데 많이 사용되는 데, 해당 기공 크기나 열적/수열안정성은 제올라이트 내부나 외부의 원소를 바꿔줌으로써 조절할 수 있다. 더 작은 0.28 nm 크기를 지닌 SOD 유형의 제올라이트의 경우, 수소나 물 분리에 적합하여 그 관심도가 높아지고 있으며, 이 제올라이트 유형 또한, 이온 교환과 같은 방법으로 성질을 변경할 수 있다. 제올라이트는 주변 기술 및 공정 조건에 맞게 작은 분자들을 적절하게 분리할 수 있는 분리막을 창출할 수 있다는 장점을 지닌 소재이다. Membrane separation is a technology of low energy consumption. Membranes made of zeolites are of great interest because their fixed and open pores in the size of small molecules inside crystalline structures allow separation processes under harsh conditions. While zeolite NaA (LTA-type) is industrially used for dewatering of organic solvents, its pore size and thermal and hydrothermal stability can be tuned by exchange of framework and extra-framework elements. SOD with pores of only 0.28 nm is of great interest for H2- und H2O-separation and also can be tuned by ion exchange. Zeolites open the opportunity to create membranes of adapted separation behavior for small molecules in conditions of surrounding technical processes.
Modern Design Education of Geometrical Patterns
Hann, Michael A.;Park, Myung-Ja 한양대학교 2007 韓國 生活 科學 硏究 Vol.27 No.2
The objective of this paper is to present an outline of subject matter of importance to design teachers and instructors who wish to develop the curriculum presented to design students. The intention is to rekindle an awareness of fundamental geometric concepts and principles, regarded as essential components of the design curriculum one hundred years ago, but gradually eased out during the past three or four decades. Geometric concepts and principles are of importance to all two- and three-dimensional design. The reticence of instructors and teachers to address this issue is understandable, for often the knowledge and understanding required to develop appropriate theoretical curricula is hidden in relatively obscure literature, and wrapped in unfamiliar symbols and terminology. The topics covered include: point, line, structure and form; tiling the plane; regular and semi-regular periodic tilings; motifs, patterns and symmetry; Penrose-type aperiodic tilings; the principles of modularity (minimum inventory and maximum diversity); the Fibonacci series and the golden section; polyhedra; scale similarity and fractals. These topics are covered in lectures courses being delivered currently at Hanyang University.
The Internationalisation of Fashion Consumption. Challenges for the Twenty-first Century
Hann, M. A.,MacGillivray, M. S. The Costume Culture Association Department of Clot 2000 Fashion, industry and education Vol.3 No.3
The nature of internationalisation is explored and the historical stages in the process described. A series of profiles of fashion companies, which have pursued policies of internationalisation, is presented. The challenges faced by fashion producers and retailers, as they enter the twenty-first century, are identified and the changing context of fashion consumption if recognised.