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Chia, Elbert E. M.,Talbayev, D.,Zhu, Jian-Xin,Yuan, H. Q.,Park, T.,Thompson, J. D.,Panagopoulos, C.,Chen, G. F.,Luo, J. L.,Wang, N. L.,Taylor, A. J. American Physical Society 2010 Physical Review Letters Vol.104 No.2
<P>We report measurements of quasiparticle relaxation dynamics in the high-temperature superconductor (Ba,K)Fe2As2 in optimally doped, underdoped, and undoped regimes. In the underdoped sample, spin-density wave (SDW) order forms at approximately 85 K, followed by superconductivity at approximately 28 K. We find the emergence of a normal-state order that suppresses SDW at a temperature T{*} approximately 60 K and argue that this normal-state order is a precursor to superconductivity.</P>
Lee, E.J.,Lee, H.J.,Kamli, M.R.,Pokharel, S.,Bhat, A.R.,Lee, Y.H.,Choi, B.H.,Chun, T.,Kang, S.W.,Lee, Y.S.,Kim, J.W.,Schnabel, R.D.,Taylor, J.F.,Choi, I. Academic Press 2012 Genomics Vol.100 No.3
We report a systematic study of gene expression during myogenesis and transdifferentiation in four bovine muscle tissues and of adipogenesis in three bovine fat tissues using DNA microarray analysis. One hundred hybridizations were performed and 7245 genes of known and unknown function were identified as being differentially expressed. Supervised hierarchical cluster analysis of gene expression patterns revealed the tissue specificity of genes. A close relationship in global gene expression observed for adipocyte-like cells derived from muscle and adipocytes derived from intramuscular fat suggests a common origin for these cells. The role of transthyretin in myogenesis is a novel finding. Different genes were highly induced during the transdifferentiation of myogenic satellite cells and in the adipogenesis of preadipocytes, indicating the involvement of different molecular mechanisms in these processes. Induction of CD36 and FABP4 expression in adipocyte-like cells and adipocytes may share a common pathway.
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.
[ ] 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.
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
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.
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>
B. W. Metcalfe,T. N. Nielsen,N. de N. Donaldson,A. J. Hunter,J. T. Taylor 대한의용생체공학회 2018 Biomedical Engineering Letters (BMEL) Vol.8 No.1
Neural interfaces have great potential to treat disease and disability by modulating the electrical signals within the nervoussystem. However, whilst neural stimulation is a well-established technique, current neural interfaces are limited by poorrecording ability. Low signal amplitudes necessitate the use of highly invasive techniques that divide or penetrate thenerve, and as such are unsuitable for chronic implantation. In this paper, we present the first application of the velocityselective recording technique to the detection of respiration activity in the vagus nerve, which is involved with treatmentsfor epilepsy, depression, and rheumatoid arthritis. Further, we show this using a chronically implantable interface that doesnot divide the nerve. We also validate our recording setup using electrical stimulation and we present an analysis of therecorded signal amplitudes. The recording interface was formed from a cuff containing ten electrodes implanted around theintact right vagus nerve of a Danish Landrace pig. Nine differential amplifiers were connected to adjacent electrodes, andthe resulting signals were processed to discriminate neural activity based on conduction velocity. Despite the averagesingle channel signal-to-noise ratio of - 5.8 dB, it was possible to observe distinct action potentials travelling in bothdirections along the nerve. Further, contrary to expectation given the low signal-to-noise ratio, we have shown that it waspossible to identify afferent neural activity that encoded respiration. The significance of this is the demonstration of achronically implantable method for neural recording, a result that will transform the capabilities of future neuroprostheses.
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>