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Lee, W,Kiba, T,Murayama, A,Sartel, C,Sallet, V,Kim, I,Taylor, R A,Jho, Y D,Kyhm, K Optical Society of America 2014 Optics express Vol.22 No.15
<P>The Temperature dependence of the exciton radiative decay time in ZnO nanorods has been investigated, which is associated with the density of states for the intra-relaxation of thermally excited excitons. The photoluminescence decay time was calibrated by using the photoluminescence intensity in order to obtain the radiative decay time. In the absence of an external magnetic field, we have confirmed that the radiative decay time increased with temperature in a similar manner to that seen in bulk material (similar to T-1.5). Under an external magnetic field of 6T parallel to the c-axis, we found that the power coefficient of the radiative decay time with temperature decreased (similar to T-1.3) when compared to that in the absence of a magnetic field. This result can be attributed to an enhancement of the effective mass perpendicular to the magnetic field and a redshift of the center-of-mass exciton as a consequence of perturbation effects in the weak-field regime. (C) 2014 Optical Society of America</P>
Dynamics and gain in highly-excited InGaN MQWs
R.A.Taylor,K.Kyhm,J.D.Smith,J.H.Rice,J.F.Ryan,T.Someya,Y.Arakawa 한국물리학회 2002 Current Applied Physics Vol.2 No.4
The Kerr gate technique is used to time-resolve the gain in an In0:02Ga0:98N/In0:16Ga0:84N multiple quantum well sample. A newwayofanalyzingthe datain suchavariable stripelength methodgainexperiment isusedto analyzeboththetime-integrated andtime-is caused by the change of the chemical potential along the excited stripe due to the interaction of the carrier and photon densities, andthegain thresholddensityisestimated. Atrialfunctionassuming aLorentzian lineshapeforthe stripelengthdependence ofthe gainiscompared with the edge emission intensity. This is found to t very well with our data, even beyond the saturation region. Fur-thermore, we have extended the investigation to examine the dynamics of the emission and gain. These measurements suggest that thephotoexcited carriers must localize (possibly at indium-rich sites) before strong stimulated emission is seen.. 2002 Elsevier Science B.V. All rights reserved.
A novel quantum interference probe of the energy spectrum of coupled nanodevices
T.P. Martin,R.P. Taylor,H. Linke,B. Murray,N. Aoki,D. Oonishi,Y. Iwase,Y. OchiaI 한국물리학회 2006 Current Applied Physics Vol.6 No.3
Quantum transport of an array of quantum billiards is investigated as a function of the coupling strength of the quantum point con-invasive probe of two characteristic energy scales of the energy level spectrumthe average energy level spacing and average energy levelbroadening. This analysis reveals a marked transition in the coherent area of the array as the coupling between the billiards is increasedand the array evolves into a combined quantum system.
MAGNETIC FORCE MICROMANIPULATION SYSTEMS FOR THE BIOLOGICAL SCIENCES
R. SUPERFINE,J. K. FISHER,L. VICCI,J. CRIBB,E. T. O'BRIEN,R. M. TAYLOR II 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2006 NANO Vol.1 No.3
Manipulation systems using magnetic field gradients have the ability to apply a large range of forces noninvasively to a specific target. Depending on the requirements of a given experiment, the systems may be as simple as a single electromagnet for unidirectional manipulation or as complex as a high-frequency three-dimensional manipulator with force feedback. Here, we discuss the motivation for developing such systems, theory and design considerations, and give examples of the broad range of manipulators that has been put to use. In addition, we discuss a variety of applications demonstrating the range of experiments for which such a system is applicable.
Observation of two spin gap energies in the filled skutterudite compoundCeOs4Sb12
Adroja, D. T.,Park, J.-G.,Goremychkin, E. A.,McEwen, K. A.,Takeda, N.,Rainford, B. D.,Knight, K. S.,Taylor, J. W.,Park, Jeongmi,Walker, H. C.,Osborn, R.,Riseborough, Peter S. American Physical Society 2007 Physical review. B, Condensed matter and materials Vol.75 No.1
Molecular Recognition of Methionine-Terminated Peptides by Cucurbit[8]uril
Hirani, Zoheb,Taylor, Hailey F.,Babcock, Emily F.,Bockus, Andrew T.,Varnado, C. Daniel,Bielawski, Christopher W.,Urbach, Adam R. American Chemical Society 2018 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.140 No.38
<P>This Article describes the molecular recognition of peptides containing an N-terminal methionine (Met) by the synthetic receptor cucurbit[8]uril (Q8) in aqueous solution and with submicromolar affinity. Prior work established that Q8 binds with high affinity to peptides containing aromatic amino acids, either by simultaneous binding of two aromatic residues, one from each of two different peptides, or by simultaneous binding of an aromatic residue and its immediate neighbor on the same peptide. The additional binding interface of two neighboring residues suggested the possibility of targeting nonaromatic peptides, which have thus far bound only weakly to synthetic receptors. A peptide library designed to test this hypothesis was synthesized and screened qualitatively for Q8 binding using a fluorescent indicator displacement assay. The large fluorescence response observed for several Met-terminated peptides suggested strong binding, which was confirmed quantitatively by the determination of submicromolar equilibrium dissociation constant values for Q8 binding to MLA, MYA, and MFA using isothermal titration calorimetry (ITC). This discovery of high affinity binding to Met-terminated peptides and, more generally, to nonaromatic peptides prompted a detailed investigation of the determinants of binding in this system using ITC, electrospray ionization mass spectrometry, and <SUP>1</SUP>H NMR spectroscopy for 25 purified peptides. The studies establish the sequence determinants required for high-affinity binding of Met-terminated peptides and demonstrate that cucurbit[<I>n</I>]uril-mediated peptide recognition does not require an aromatic residue for high affinity. These results, combined with the known ability of cucurbit[<I>n</I>]urils to target N-termini and disordered loops in folded proteins, suggest that Q8 could be used to target unmodified, Met-terminated proteins.</P> [FIG OMISSION]</BR>
Quantum conductance fluctuations in semiconductor devices
B.C. Scannell,T.P. Martin,M.S. Fairbanks,H. Linke,C.A. Marlow,T.M. Fromhold,C.V. Brown,K. Ishibashi,R.P. Taylor 한국물리학회 2008 Current Applied Physics Vol.8 No.3,4
Magneto-conductance uctuations serve as the traditional method for investigating the dynamics of electrons as they ow throughsolid-state materials. Generated by electron wave interference, their spectral content is critically sensitive to the precise scattering con-gurations in the material. In this paper, we exploit this sensitivity to study the electron dynamics in the diusive regime of semiconduc-tors where the dynamics are determined by material-induced scattering. We show that the spectral content of the uctuations measuredon diusive n+GaAs wires and quasi-ballistic AlGaAs/GaAs wires follow a fractal scaling behaviour similar to that previously observed.
Riedel, M.,Brent, T.A.,Taylor, G.,Taylor, A.E.,Hong, J.-K.,Jin, Y.-K.,Dallimore, S.R. Elsevier 2017 Marine and petroleum geology Vol.81 No.-
<P><B>Abstract</B></P> <P>The presence of a wedge of offshore permafrost on the shelf of the Canadian Beaufort Sea has been previously recognized and the consequence of a prolonged occurrence of such permafrost is the possibility of an underlying gas hydrate regime. We present the first evidence for wide-spread occurrences of gas hydrates across the shelf in water depths of 60–100 m using 3D and 2D multichannel seismic (MCS) data. A reflection with a polarity opposite to the seafloor was identified ∼1000 m below the seafloor that mimics some of the bottom-simulating reflections (BSRs) in marine gas hydrate regimes. However, the reflection is not truly bottom-simulating, as its depth is controlled by offshore permafrost. The depth of the reflection decreases with increasing water depth, as predicted from thermal modeling of the late Wisconsin transgression. The reflection crosscuts strata and defines a zone of enhanced reflectivity beneath it, which originates from free gas accumulated at the phase boundary over time as permafrost and associated gas hydrate stability zones thin in response to the transgression. The wide-spread gas hydrate occurrence beneath permafrost has implications on the region including drilling hazards associated with the presence of free gas, possible overpressure, lateral migration of fluids and expulsion at the seafloor. In contrast to the permafrost-associated gas hydrates, a deep-water marine BSR was also identified on MCS profiles. The MCS data show a polarity-reversed seismic reflection associated with a low-velocity zone beneath it. The seismic data coverage in the southern Beaufort Sea shows that the deep-water marine BSR is not uniformly present across the entire region. The regional discrepancy of the BSR occurrence between the US Alaska portion and the Mackenzie Delta region may be a result of high sedimentation rates expected for the central Mackenzie delta and high abundance of mass-transport deposits that prohibit gas to accumulate within and beneath the gas hydrate stability zone.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Discovery of permafrost related gas hydrate regime in Beaufort shelf region. </LI> <LI> Base of gas hydrate stability zone follows trend predicted by thermal modelling. </LI> <LI> Permafrost-associated gas hydrate regime poses geo-hazards to drilling. </LI> <LI> Deep-water marine hydrate regime appears irregular across Beaufort margin. </LI> </UL> </P>
The recombination mechanism of Mg-doped GaN nanorods grown by plasma-assisted molecular-beam epitaxy
Park, Y S,Na, J H,Taylor, R A,Park, C M,Lee, K H,Kang, T W IOP Pub 2006 Nanotechnology Vol.17 No.3
<P>Magnesium-doped GaN nanorods were grown on Si(111) substrates by plasma-assisted molecular-beam epitaxy. Time-integrated and time-resolved photoluminescence measurements were carried out to study the optical transitions. Two emission lines corresponding to blue emission at about 3.26 and 3.18?eV, with their corresponding phonon replicas, were observed. These peaks are attributed to conduction band to shallow acceptor transitions and to defects associated with column/substrate interface–shallow Mg acceptor complexes, respectively.</P>
[ ] Prepared by Calciothermic Reduction-Diffusion Using Different Iron Powders
Boareto J.C.,Soyama J.,Felisberto M.D.V.,Hesse R.,Pinto A.V.A.,Taylor T.R.,Wendhausen P.A.P. 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
This paper compares the effect of using different types of iron powders for the preparation of by calciothermic reduction-diffusion (CRD). Three types of iron powder were used: carbonyl, sponge and water atomized. The results show that, when immediately nitrogenated after the CRD process, prepared from sponge and water atomized iron powders yield -magnets with a high degree of texture. However, after a suitable treatment with hydrogen followed by nitrogenation, -powders made from Carbonyl iron produce magnets with the best quality regarding coercivity, remanence and degree of texture.