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Kim, Kyoung-Min,Shin, Dongwoo,Sasaki, M.,Kim, Heon-Jung,Kim, Jeehoon,Kim, Ki-Seok American Physical Society 2016 Physical Review B Vol.94 No.8
<P>It is at the heart of modern condensed matter physics to investigate the role of a topological structure in anomalous transport phenomena. In particular, chiral anomaly turns out to be the underlying mechanism for the negative longitudinal magnetoresistivity in a Weyl metal phase. The existence of a dissipationless current channel causes enhancement of electric currents along the direction of a pair of Weyl points or applied magnetic fields (B). However, temperature (T) dependence of the negative longitudinal magnetoresistivity has not been understood yet in the presence of disorder scattering since it is not clear at all how to introduce effects of disorder scattering into the topological-in-origin transport coefficient at finite temperatures. The calculation based on the Kubo formula of the current-current correlation function is simply not known for this anomalous transport coefficient. Combining the renormalization group analysis with the Boltzmann transport theory to encode the chiral anomaly, we reveal how disorder scattering renormalizes the distance between a pair of Weyl points and such a renormalization effect modifies the topological-in-origin transport coefficient at finite temperatures. As a result, we find breakdown of B/T scaling, given by B/T1+eta with 0 < eta < 1. This breakdown may be regarded to be a fingerprint of the interplay between disorder scattering and topological structure in a Weyl metal phase.</P>
Kim, Duyeol,Han, Kiwon,Oh, Yeonsu,Kim, Chung Hyun,Kang, Ikjae,Lee, Jeehoon,Gottschalk, Marcelo,Chae, Chanhee Canadian Veterinary Medical Association = Associat 2010 Canadian journal of veterinary research Vol.74 No.4
<P>The objective of this study was to determine the capsular serotypes and potential virulence factors of Streptococcus suis isolated from pigs with polyserositis. Among the 24 isolates evaluated, serotype 3 [7 (29%) of the isolates] and serotype 4 [5 (21%)] were the most common. The isolates were also studied for the presence of the genes mrp, epf, and sly, which encode muramidase-released protein (MRP), extracellular factor (EF), and suilysin (SLY), respectively. Of the 24 isolates, 8 carried mrp: 4 of serotype 3, 2 of serotype 2, and 2 of serotype 4. One mrp(+) isolate (serotype 2) also carried the epf gene. All 24 isolates carried the sly gene. The serotype and genotype distribution greatly differed from that reported for isolates from pigs with other clinical manifestations of S. suis infection in other countries.</P>
Nano-textured surfaces using hybrid micro- and nano-materials for efficient water cooling
Kim, Min-Woo,Kim, Tae Gun,Jo, Hong Seok,Lee, Jong-Gun,James, Scott C.,Choi, Mun Seok,Kim, Woo Yeong,Yang, Jae Sin,Choi, Jeehoon,Yoon, Sam S. Elsevier 2018 INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER - Vol.123 No.-
<P><B>Abstract</B></P> <P>Water cooling heat transfer was enhanced by texturing the heated surface with various micro- and nano-materials. The increased surface area by texturing facilitated not only enhanced convection, but also turbulent mixing, which increased the effective heat-transfer coefficient. A heated copper substrate was textured with electroplated copper oxide, sprayed silver nanowire, or sprayed copper micro-particles. Sprayed micro-particles were subsequently nano-textured by sand blasting with kanthal (Mo<SUB>2</SUB>Si) nanoparticles. Because of the extremely high hardness of kanthal, sand blasting dimpled the surface to increase the total surface area. Optimal texturing was identified for each material. Hybrid cases combining two different texturing materials were also investigated. All cases were quantitatively compared and that with the highest effective heat transfer was identified. Texturing materials were characterized by scanning electron microscopy and X-ray diffraction. The coating methods are simple, rapid, and scalable and may be cost-effective texturing schemes for various electronics cooling applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Water cooling heat transfer was enhanced by texturing the heated surface with various micro- and nano-materials. </LI> <LI> The increased surface area enhanced convection and turbulent mixing. </LI> <LI> A substrate was textured with electroplated copper oxide, sprayed silver nanowire or sprayed copper micro-particles. </LI> <LI> The texturing methods are appropriate for electronics cooling applications because of their simplicity and scalability. </LI> </UL> </P>
Kim, Jeehoon,Haberkorn, N.,Nazaretski, E.,Paula, R. de,Tan, Teng,Xi, X.X.,Tajima, T.,Movshovich, R.,Civale, L. Elsevier 2015 Solid state communications Vol.204 No.-
<P><B>Abstract</B></P> <P>We report the influence of two-band superconductivity on the flux creep and the critical current densities of a MgB<SUB>2</SUB> thin film. The small magnetic penetration depth of <I>λ</I>=50±10nm at <I>T</I>=4K is related to a clean π-band. We find a high self-field critical current density <I>J</I> <SUB> <I>c</I> </SUB>, which is strongly reduced with applied magnetic field, and attribute this to suppression of the superconductivity in the π-band. The temperature dependence of the creep rate <I>S</I> (<I>T</I>) at low magnetic field can be explained by a simple Anderson–Kim mechanism. The system shows high pinning energies at low field that are strongly suppressed by high field.</P>