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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.
한안진,김한호 仁川敎育大學校 科學敎育硏究所 1997 과학교육논총 Vol.9 No.-
The children's interests about the science classroom management Hann, Ann-chin and Kim, Han-Ho* Inchon National University of Education, *Jungkyo Elementary School The purpose of this study was to investigate children's interests about the science classroom managements. One class in 4th grade and one science teacher were sampled. Data were collected by a clinical interview, class observation and questionaries, and analysed by quantative and qualitative methods. Major findings of this study were as follows 1. Children showed their interests about using new tools and abundant materials, new contents, hand-on activities and topics that included cognitive conflict 2 Children showed their interests and demand on field trips
Design Theory, Visual Perception, Illusion and Expectation
Hann, Michael A. 한양대학교 2010 韓國 生活 科學 硏究 Vol.30 No.1
In the visual arts and design the organization of various elements is of importance. The intention may be to organize these elements in order to solve a particular problem. The outcome (eg. a designed product) may fulfil certain functional or aesthetic requirements (frequently both). In order to arrive at this anticipated outcome it is necessary therefore to utilize certain design elements and to combine these with reference to various design principles. The intention of this special paper is to review the nature of these elements and principles and principles of Gestalt psychology. The study of visual perception suggests that images are not given situations, but are constructed by our expectations and experiences. In the western world of the early twenty-first century, primacy is given to visual phenomena as the principal means of determining meaning. From the times of Plato and Aristotle, vision and reason have been intertwined. Thinking is associated with visual metaphors, typified by terms such as insight, illuminate, shedding light, enlighten, vision, reflection, clarity, survey, perspective, point of view, overview, farsighted etc.
Muts Homolog Sliding Clamps Shield the DNA from Binding Proteins
Hanne, Jeungphill,Britton, Brooke M.,Park, Jonghyun,Liu, Jiaquan,Martin-Lopez, Juana,Jones, Nathan,Schoffner, Matthew,Klajner, Piotr,Bundschuh, Ralf,Lee, Jong-Bong,Fishel, Richard Published for the Biophysical Society by the Rocke 2019 Biophysical journal Vol.116 No.3
Hann, Sarah D.,Niepa, Tagbo H. R.,Stebe, Kathleen J.,Lee, Daeyeon American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.38
<P>Diverse fields including drug and gene delivery and live cell encapsulation require biologically compatible encapsulation systems. One widely adopted means of forming capsules exploits cargo-filled microdroplets in an external, immiscible liquid phase that are encapsulated by a membrane that forms by trapping of molecules or particles at the drop surface, facilitated by the interfacial tension. To eliminate the potentially deleterious oil phase often present in such processes, we exploit the aqueous two phase system of poly(ethylene glycol) (PEG) and dextran. We form capsules by placing dextran-rich microdroplets in an external PEG-rich phase. Strong polyelectrolytes present in either phase form complexes at the drop interface, thereby forming a membrane encapsulating the fluid interior. This process requires considerable finesse as both polyelectrolytes are soluble in either the drop or external phase, and the extremely low interfacial tension is too weak to provide a strong adsorption site for these molecules. The key to obtaining microcapsules is to tune the relative fluxes of the two polyelectrolytes so that they meet and complex at the interface. We identify conditions for which complexation can occur inside or outside of the drop phase, resulting in microparticles or poor encapsulation, respectively, or when properly balanced, at the interface, resulting in microcapsules. The resulting microcapsules respond to the stimuli of added salts or changes in osmotic pressure, allowing perturbation of capsule permeability or triggered release of capsule contents. We demonstrate that living cells can be sequestered and interrogated by encapsulating <I>Pseudomonas aeruginosa</I> PAO1 and using a Live/Dead assay to assess their viability. This method paves the way to the formation of a broad variety of versatile functional membranes around all aqueous capsules; by tuning the fluxes of complexing species to interact at the interface, membranes comprising other complexing functional moieties can be formed.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2016/aamick.2016.8.issue-38/acsami.6b07939/production/images/medium/am-2016-079398_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am6b07939'>ACS Electronic Supporting Info</A></P>