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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>
An Approach to Transit Path Design Using GIS
S.V.C. Sekhar, Wen Long Yue, M.A.P.Taylor 서울시립대학교 도시과학연구원 2004 International journal of urban sciences (IJUS) Vol. No.
The design of public transportation networks is complex and can include conflicting objectives. Networks designed to minimise travel time may not fulfil the requirement of maximum coverage and accessibility. In this context, a multi-criteria approach for transit alignment design has been developed to maximise a range of objectives using census data. Whenever a subdivision is developed in a suburban region of a medium sized city, transit operators often receive requests to link the city centre with the new locality via new routes. Traditionally, implementation of routing a new bus service is based on a ‘common sense’approach. This can lead to the development of an irrational network of public transport routes. This research offers an alternative approach, which essentially optimises ulticriteria for planning transit routes. This research has proved that it is worth considering such options for connecting origin-destination zones with a new bus service.
Low gain threshold density of a single InGaP quantum well sandwiched by digital alloy
Kim, B.,Kyhm, K.,Je, K.C.,Song, J.D.,Kim, S.Y.,Le, E.H.,Taylor, R.A. Elsevier 2014 CURRENT APPLIED PHYSICS Vol.14 No.9
A single In<SUB>0.49</SUB>Ga<SUB>0.51</SUB>P quantum well sandwiched by In<SUB>0.49</SUB>Ga<SUB>0.51</SUB>P/In<SUB>0.49</SUB>(Ga<SUB>0.6</SUB>Al<SUB>0.4</SUB>)<SUB>0.51</SUB>P digital alloy structures was investigated in terms of optical modal gain, where gain saturation effects were also considered for both changes in wavelength and stripe length by using a modal gain contour map analysis. We found the gain threshold density is considerably lower by an order of magnitude when compared to the Mott density (~2 x 10<SUP>12</SUP> cm<SUP>-2</SUP>), which can be attributed to a carrier-harvesting effect through the mini-band of the digital alloy.
Low gain threshold density of a single InGaP quantum well sandwiched by digital alloy
B. Kim,김광석,K.C. Je,J.D.Song,S.Y. Kim,E.H. Lee,R.A.Taylor 한국물리학회 2014 Current Applied Physics Vol.14 No.9
A single In0.49Ga0.51P quantum well sandwiched by In0.49Ga0.51P/In0.49(Ga0.6Al0.4)0.51P digital alloy structures was investigated in terms of optical modal gain, where gain saturation effects were also considered for both changes inwavelength and stripe length by using a modal gain contour map analysis. We found the gain threshold density is considerably lower by an order of magnitude when compared to the Mott density (~2 1012 cm2), which can be attributed to a carrier-harvesting effect through the mini-band of the digital alloy.
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.
[ ] 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.
Computational Methods for Patient-Specific Perfusion Simulations of Coronary Arteries
Hyun Jin Kim(김현진),L. Papamanolis,C. Jaquet,M. Sinclair,M. Schaap,I. Danad,P. van Diemen,P. Knaapen,L. Najman,H. Talbot,C. A. Taylor,I. E. Vignon-Clementel 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
Patient-specific computational simulations of blood flow are utilized to diagnose and predict treatment outcomes of coronary artery disease. The computational simulations, however, are limited when estimating perfusion in the myocardium as multiscale vessels from arteries to capillaries need to be developed. We propose a multiscale patient-specific computational model framework to simulate blood flow from large coronary arteries to myocardial tissues. Patient vasculatures were segmented from coronary computed tomography angiography data and then extended from the image-based model down to the arteriole level using a space-filling synthetic forest of arterial trees. Blood flow is modelled by coupling a 1-D model of the coronary arteries to a single-compartment Darcy myocardium model. Simulated results for 5 patients with non-obstructive coronary artery disease are compared to [<sup>15</sup>O]H<sub>2</sub>O PET exam data for both resting and hyperemic conditions. Results on a patient with a severe disease demonstrate coronary artery disease can predict myocardial regions with perfusion deficit. This multiscale computational model of simulating blood flow from the epicardial coronary arteries to the left ventricle myocardium will be further validated and applied to human data.
NMR and X-ray Study Revealing the Rigidity of Zeolitic Imidazolate Frameworks
Morris, William,Stevens, Caitlin J.,Taylor, R. E.,Dybowski, C.,Yaghi, Omar M.,Garcia-Garibay, Miguel A. American Chemical Society 2012 The Journal of Physical Chemistry Part C Vol.116 No.24
<P>NMR relaxation studies and spectroscopic measurements of zeolitic imidazolate framework-8 (ZIF-8) are reported. The dominant nuclear spin–lattice relaxation (<I>T</I><SUB>1</SUB>) mechanism for ZIF-8 in air arises from atmospheric paramagnetic molecular oxygen. The <SUP>13</SUP>C <I>T</I><SUB>1</SUB> measurements indicate that the oxygen interacts primarily with the imidazolate ring rather than the methyl substituent. Similar relaxation behavior was also observed in a ZIF with an unsubstituted ring, ZIF-4. Single-crystal X-ray diffraction was used to provide data for the study of the thermal ellipsoids of ZIF-8 at variable temperatures from 100 to 298 K, which further confirmed the rigid nature of this ZIF framework. These results highlight a rigid ZIF framework and are in contrast with dynamic metal–organic frameworks based on benzenedicarboxylate linking groups, for which the relaxation reflects the dynamics of the benzenedicarboxylate moiety.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2012/jpccck.2012.116.issue-24/jp303907p/production/images/medium/jp-2012-03907p_0003.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp303907p'>ACS Electronic Supporting Info</A></P>
Surface-Effect-Induced Optical Bandgap Shrinkage in GaN Nanotubes
Park, Young S.,Lee, Geunsik,Holmes, Mark J.,Chan, Christopher C. S.,Reid, Benjamin P. L.,Alexander-Webber, Jack A.,Nicholas, Robin J.,Taylor, Robert A.,Kim, Kwang S.,Han, Sang W.,Yang, Woochul,Jo, Y. American Chemical Society 2015 NANO LETTERS Vol.15 No.7
<P>We investigate nontrivial surface effects on the optical properties of self-assembled crystalline GaN nanotubes grown on Si substrates. The excitonic emission is observed to redshift by ∼100 meV with respect to that of bulk GaN. We find that the conduction band edge is mainly dominated by surface atoms, and that a larger number of surface atoms for the tube is likely to increase the bandwidth, thus reducing the optical bandgap. The experimental findings can have important impacts in the understanding of the role of surfaces in nanostructured semiconductors with an enhanced surface/volume ratio.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2015/nalefd.2015.15.issue-7/acs.nanolett.5b00924/production/images/medium/nl-2015-00924p_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl5b00924'>ACS Electronic Supporting Info</A></P>
Pathogenesis, evaluation, and management of osteolysis after total shoulder arthroplasty
Kyle N. Kunze,Laura M. Krivicich,Christopher Brusalis,Samuel A. Taylor,Lawrence V. Gulotta,Joshua S. Dines,Michael C. Fu 대한견주관절의학회 2022 대한견주관절의학회지 Vol.25 No.3
Radiographic osteolysis after total shoulder arthroplasty (TSA) remains a challenging clinical entity, as it may not initially manifest clinically apparent symptoms but can lead to clinically important complications, such as aseptic loosening. A thorough consideration of medical history and physical examination is essential to rule out other causes of symptomatic TSA—namely, periprosthetic joint infection—as symptoms often progress to vague pain or discomfort due to subtle component loosening. Once confirmed, nonoperative treatment of osteolysis should first be pursued given the potential to avoid surgery-associated risks. If needed, the current surgical options include glenoid polyethylene revision and conversion to reverse shoulder arthroplasty. The current article provides a comprehensive review of the evaluation and management of osteolysis after TSA through an evidence-based discussion of current concepts.