1,628 research outputs found
Temperature dependence of Mott transition in VO_2 and programmable critical temperature sensor
The temperature dependence of the Mott metal-insulator transition (MIT) is
studied with a VO_2-based two-terminal device. When a constant voltage is
applied to the device, an abrupt current jump is observed with temperature.
With increasing applied voltages, the transition temperature of the MIT current
jump decreases. We find a monoclinic and electronically correlated metal (MCM)
phase between the abrupt current jump and the structural phase transition
(SPT). After the transition from insulator to metal, a linear increase in
current (or conductivity) is shown with temperature until the current becomes a
constant maximum value above T_{SPT}=68^oC. The SPT is confirmed by micro-Raman
spectroscopy measurements. Optical microscopy analysis reveals the absence of
the local current path in micro scale in the VO_2 device. The current uniformly
flows throughout the surface of the VO_2 film when the MIT occurs. This device
can be used as a programmable critical temperature sensor.Comment: 4 pages, 3 figure
Eastern Staining: A Simple Recombinant Protein Detection Technology Using a Small Peptide Tag and Its Counter Partner Which is a Fluorescent Compound
Small peptide tags such as c-myc, HA, or FLAG tag have facilitated efficient Westernblotting
of proteins of interest especially when specific antibodies for the proteins are
not available. However, the conventional Western-blotting requires the multi-steps
process taking at least several hours up to two days. With examples of various applications,
here we show a convenient and time-saving method for protein detection which
employs a fluorescent chemical BDED and its binding peptide RC-tag. And we propose
āEstern stainingā, as a standard term for protein detection method using fluorescent
chemicals and their binding small peptide tags. Eastern staining may substitutes for the
time-consuming āimmuno-stainingā in many versatile applications.22Yothe
Fuzzy implicative hyper BCK-ideals of hyper BCK-algebras
We consider the fuzzification of the notion of implicative hyper
BCK-ideals, and then investigate several properties.
Using the concept of level subsets, we give a
characterization of a fuzzy implicative hyper BCK-ideal. We state
a relation between a fuzzy hyper BCK-ideal and a fuzzy implicative
hyper BCK-ideal. We establish a condition for a fuzzy hyper
BCK-ideal to be a fuzzy implicative hyper BCK-ideal. Finally, we
introduce the notion of hyper homomorphisms of hyper
BCK-algebras, and discuss related properties
Monitoring of multi-frequency polarization of gamma-ray bright AGNs
We started two observing programs with the Korean VLBI Network (KVN)
monitoring changes in the flux density and polarization of relativistic jets in
gamma-ray bright AGNs simultaneously at 22, 43, 86, 129 GHz. One is a
single-dish weekly-observing program in dual polarization with KVN 21-m
diameter radio telescopes beginning in 2011 May. The other is a VLBI
monthly-observing program with the three-element VLBI network at an angular
resolution range of 1.0--9.2 mas beginning in 2012 December. The monitoring
observations aim to study correlation of variability in gamma-ray with that in
radio flux density and polarization of relativistic jets when they flare up.
These observations enable us to study the origin of the gamma-ray flares of
AGNs.Comment: 4 pages, 4 figures, Proceedings of the conference "The innermost
regions of relativistic jets and their magnetic fields", Granada, Spai
A new strategy for integrating abundant oxygen functional groups into carbon felt electrode for vanadium redox flow batteries
The effects of surface treatment combining corona discharge and hydrogen peroxide (H2O2) on the electrochemical performance of carbon felt electrodes for vanadium redox flow batteries (VRFBs) have been thoroughly investigated. Ahigh concentration of oxygen functional groups has been successfully introduced onto the surface of the carbon felt electrodes by a specially designed surface treatment, which is mainly responsible for improving the energy efficiency of VRFBs. In addition, the wettability of the carbon felt electrodes also can be significantly improved. The energy efficiency of the VRFB cell employing the surface modified carbon felt electrodes is improved by 7% at high current density (148 mA cm(-2)). Such improvement is attributed to the faster charge transfer and better wettability allowed by surface-active oxygen functional groups. Moreover, this method is much more competitive than other surface treatments in terms of processing time, production costs, and electrochemical performance.
A new strategy for integrating abundant oxygen functional groups into carbon felt electrode for vanadium redox flow batteries
The effects of surface treatment combining corona discharge and hydrogen peroxide (H2O2) on the electrochemical performance of carbon felt electrodes for vanadium redox flow batteries (VRFBs) have been thoroughly investigated. A high concentration of oxygen functional groups has been successfully introduced onto the surface of the carbon felt electrodes by a specially designed surface treatment, which is mainly responsible for improving the energy efficiency of VRFBs. In addition, the wettability of the carbon felt electrodes also can be significantly improved. The energy efficiency of the VRFB cell employing the surface modified carbon felt electrodes is improved by 7% at high current density (148ā
mA cmā2). Such improvement is attributed to the faster charge transfer and better wettability allowed by surface-active oxygen functional groups. Moreover, this method is much more competitive than other surface treatments in terms of processing time, production costs, and electrochemical performance
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