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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>
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.
Improving Critical Thinking Skills in Online Teaching
Sandra C. Taylor(샌드라 테일러),Rhonda Phillips(론다필립스),Kee, Youngwha(기영화) 충북대학교 국제개발연구소 2020 사회적경제와 정책연구 Vol.10 No.1
본 연구는 온라인 교수과정에서 토론게시판을 통한 학습자들의 비판적 사고능력을 향상 시키는 방법을 탐구하는데 그 목적을 두고 있다. 이를 위해 다양한 선행연구들을 통해 성향과 같은 비판적 사고의 특성과 비판적 사고의 측정 도구들을 분석하여 비판적 사고를 향상시키는 방법을 탐구하였다. 비판적 사고에 영향을 미치는 비동시적 토론 게시판이 비판적 사고에 미치는 영향을 분석하였다. 연구결과 온라인 토론게시판은 학습자들의 비판적 사고에 영향을 미쳤으며 그 요인은 제한된 토론참여자 수, 단순 반응을 넘어선 소크라테스식 방법에 관심갖고 사용하도록 유인하기, 토론 주제를 찬반양론식으로 구분하지 않는 것이었다. 연구결과 교수자들은 비동시적 온라인 토론의 매체가 학습자들의 비판적 사고 능력을 증진하기 사용될 수 있도록 교수활동을 설계하고 비동시적 토론게시판을 사용하여 비판적 사고를 증진 시킬 수 있도록 활용될 것이다. The purpose of this paper is to explore ways of improving critical thinking skills via discussion boards. It reviews various critical thinking characteristics such as predispositions, examines instruments for measuring critical thinking, explores ways critical thinking skills may be improved, and examines various aspects of asynchronous discussion board methodology for its impact on critical thinking. Specific things we found to enhance critical thinking in asynchronous online discussions include limiting discussion size, using the Socratic Method, compelling critical thinking practice rather than allowing research for responses, and not dividing topics for discussion between pro and con. We propose the medium of asynchronous online discussion student critical thinking abilities recommendations to assist educators in designing activities and using asynchronous discussion boards to improve critical thinking in their classrooms.
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.
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>
Genomic and Functional Approaches to Understanding Cancer Aneuploidy
Taylor, Alison M.,Shih, Juliann,Ha, Gavin,Gao, Galen F.,Zhang, Xiaoyang,Berger, Ashton C.,Schumacher, Steven E.,Wang, Chen,Hu, Hai,Liu, Jianfang,Lazar, Alexander J.,Cherniack, Andrew D.,Beroukhim, Ram Elsevier Science B.V., Amsterdam 2018 Cancer cell Vol.33 No.4