247,901 research outputs found
Synthesis of Co(3)O(4) nanowire arrays supported on Ni foam for removal of volatile organic compounds
No full textCrystalline Co3O4 nanowire arrays freely supported on Ni foam are successfully synthesized using a template-free method. The effects of reaction time, concentration of reactants, and temperature on the morphology of the nanowires are studied. The results indicate that uniform Co3O4 nanowires could be synthesized at 90 degrees C, and a transformation of the samples' morphology from nanoparticles to nanowires to microrods is observed by controlling the concentration of the reactants. The well-ordered nanowires synthesized under the selected reaction conditions are composed of spinel Co3O4 with diameters of 500-580 nm and lengths of 6-8 microm. These nanowires show good catalytic activity for the ozone catalytic oxidation of toluene.Hui, K. N.; Yin, Cui-Lei; Hui, K. S.; Lee, J. Y.; Li, M.; Lee, S. K.; Tsui, K. L.; Chao, Christopher Y H; Kwong, C. W
Net Nitrogen Mineralization and Nitrification of Different Landscape Positions in a Lowland Subtropical Rain Forest of Taiwan
No full text
Delocalization by disorder in GaAs/AlGaAs heterostructures
No full textAn experimental study of quasiparticle and quasi-one dimensional properties of strongly correlated two-dimensional (2D) electron systems has been carried out. The samples were low disordered
GaAs/AlGaAs heterostructures. Measurements were performed at low temperatures, down to 24 mK, in a dilution refrigerator (MCK 50-100 TOF) equipped with a superconducting magnet.
The goal of our work was to study quasiparticle properties of 2DEG and to investigate the effect of local disorder on the conductance of the sample.
We have performed independent measurements of effective electron mass m*, transport and quantum scattering time at three different temperatures and effective g-factor. We used Shubnokov de Haas
effect , the oscillations in the longitudinal resistance in Hall effect to study the effective mass, scattering lifetimes and effective g factor. We found out that effective mass is unaffected and agrees well with
the typical value of GaAs/AlGaAs system i.e. 0.067 me, where me is the electron mass. The quantum scattering time was studied at three different temperatures, base temperature (24mK), 200 mK and
400 mK as function of electron density. We found out that the quantum scattering time at 24 mK is independent of electron density while at higher temperatures it decreases with decrease in density.
The ratio of two lifetimes τ_t and τ_q is more than 10 for all temperatures. It means that remote Coulomb centres play a dominating role in the scattering mechanisms of our sample.
More insight is needed to study the quantum scattering time at higher temperatures. The effective g-factor experiments were done with and without in-plane magnetic field. In both cases, the g-factor shows
dependence on the magnetic field.
The main purpose of this thesis work is to investigate possible breakdown of the Anderson localization in presence of local disorder. To implement the local disorder and create delocalization
we have used fine surface gates which tuned the potential barriers in the 2DEG. This was done in two different types of samples. In one sample the finger gates and top surface gate are isolated by
an insulating layer of SiO2 and in the other sample, the two gates are intercalated. The spacing in between the finger gates is determined by the mean free path of the system. The experiments are done in
absence of magnetic field. We found out that the sample with SiO2shows the effect of disorder with decrease in the resistance. But due to charge trapped in the SiO2layer, the effect was not repeated.
In the intercalated samples with two different finger gate spacings, the effect was not visible. The delocalization was not set in these sample even at high temperatures. More study is needed to prove this
effect in GaAs/AlGaAs heterostructures. A low mobility wafer can be considered as the future candidate for this experiment
Supplemental Material - Tailoring Strength Training Prescriptions for People with Rheumatoid Arthritis: A Scoping Review
No full textSupplemental Material for Tailoring Strength Training Prescriptions for People with Rheumatoid Arthritis: A Scoping Review by Michael L. Wu, B.Kin, Jasmin K. Ma, PhD, B.Kin, Karen Tsui, BSc(PT), Alison M. Hoens, MSc, BSc(PT), and Linda C. Li, PhD, BSc(PT) in American Journal of Lifestyle Medicine</p
Underground pedestrian network for urban commercial development in Tsim Sha Tsui of Hong Kong
No full textTsim Sha Tsui is one of the most important CBD areas in Hong Kong. From early 2000s, a new underground pedestrian network was being developed to extend the original Tsim Sha Tsui Metro Station to access a broader scope. This paper introduces statistical analyzes on land use, pedestrian flows, pedestrian trajectories as well as qualitative investigation on planning strategies, urban renewal and real estate development to answer the following research questions: How people use this underground space network as a second level of regional pedestrian system parallel to the surface street network? How this underground pedestrian system distributes people to improve accessibility of commercial land use? How newly-developed large-scale shopping malls directly connected to the underground space distribute pedestrians to the community more efficiently as well as benefit to their own profits? (C) 2016 Published by Elsevier Ltd.CPCI-S(ISTP)[email protected]
Supplemental Material - Tailoring Strength Training Prescriptions for People with Rheumatoid Arthritis: A Scoping Review
No full textSupplemental Material for Tailoring Strength Training Prescriptions for People with Rheumatoid Arthritis: A Scoping Review by Michael L. Wu, B.Kin, Jasmin K. Ma, PhD, B.Kin, Karen Tsui, BSc(PT), Alison M. Hoens, MSc, BSc(PT), and Linda C. Li, PhD, BSc(PT) in American Journal of Lifestyle Medicine</p
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