Korea University

About: Korea University is a education organization based out in Seoul, South Korea. It is known for research contribution in the topics: Population & Catalysis. The organization has 39756 authors who have published 82424 publications receiving 1860927 citations. The organization is also known as: Bosung College & Bosung Professional College.

Nuclear modification of electron spectra and implications for heavy quark energy loss in Au+Au collisions at sNN=200GeV

Abstract: The PHENIX experiment has measured midrapidity ([FORMULA: SEE TEXT]) transverse momentum spectra ([FORMULA: SEE TEXT]) of electrons as a function of centrality in Au+Au collisions at [FORMULA: SEE TEXT]. Contributions from photon conversions and from light hadron decays, mainly Dalitz decays of pi0 and eta mesons, were removed. The resulting nonphotonic electron spectra are primarily due to the semileptonic decays of hadrons carrying heavy quarks. Nuclear modification factors were determined by comparison to nonphotonic electrons in p+p collisions. A significant suppression of electrons at high pT is observed in central Au+Au collisions, indicating substantial energy loss of heavy quarks.

Electrical characteristics of molybdenum disulfide flakes produced by liquid exfoliation.

Abstract: Graphene has become one of the most interesting nanomaterials in the past 7 years because of its unique physical properties, which originate from low dimensionality. [ 1 , 2 ] From the point of 2D conductors, other layered nanomaterials including transition metal dichalcogenides (TMDs) are also expected to have great potential in nanoelectronics, sensing, and energy harvesting. When compared with the poor mobility of organic semiconductors, semiconducting TMD compounds were reported to have higher mobilities, [ 3 ] enlightening the wide area of the applications of organic semiconductors. As the layered TMDs can be made into ultrathin fi lms with structural fl exibility, thin-fi lm devices such as thin-fi lm transistors (TFTs), sensors, and diodes can be envisaged. Furthermore, the layered structures allow ionic or molecular intercalation, suggesting possible applications in ion batteries, [ 4 ] hydrogen storage, [ 5 ]

Heavy-quark production in p + p and energy loss and flow of heavy quarks in Au + Au collisions at √sNN=200 GeV

Abstract: Transverse momentum spectra of electrons (p(T)(e)) from semileptonic weak decays of heavy-flavor mesons in the range of 0.3 < p(T)(e) < 9.0 GeV/c have been measured at midrapidity (|y| < 0.35) by the PHENIX experiment at the Relativistic Heavy Ion Collider in p + p and Au + Au collisions at root s(NN) = 200 GeV. In addition, the azimuthal anisotropy parameter v(2) has been measured for 0.3 < p(T)(e) < 5.0 GeV/c in Au + Au collisions. The substantial modification in the p(T)(e) spectra in Au + Au compared with p + p collisions as well as the nonzero v(2) indicate substantial interactions and flow of heavy quarks in traversing the produced medium. Comparisons of these observables with detailed theoretical calculations can be used to identify the nature of these interactions and to quantify their extent.

Growth model of bamboo-shaped carbon nanotubes by thermal chemical vapor deposition

Abstract: Vertically aligned carbon nanotubes were grown on iron-deposited silicon oxide substrate by thermal chemical vapor deposition of acetylene The carbon nanotubes have no encapsulated iron particles at the closed tip and a bamboo structure in which the curvature of compartment layers is directed to the tip A base growth model is suggested for the bamboo-shaped carbon nanotubes grown under our experimental conditions