48,011 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
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
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
sj-docx-1-saj-10.1177_29767342231208936 – Supplemental material for High Seroprevalence of Hepatitis C Virus Among Cisgender Women Who Exchange Sex in the Seattle, Washington Area
No full textSupplemental material, sj-docx-1-saj-10.1177_29767342231208936 for High Seroprevalence of Hepatitis C Virus Among Cisgender Women Who Exchange Sex in the Seattle, Washington Area by Michael P. Barry, Maria A. Corcorran, Judith I. Tsui, Courtney Moreno, Susan E. Buskin, Brandon L. Guthrie and Sara N. Glick in Substance Abuse</p
Erratum to: Effect of moderate red wine intake on cardiac prognosis after recent acute myocardial infarction of subjects with Type 2 diabetes mellitus (Diabetic Medicine, (2006), 23, 9, (974-981), 10.1111/j.1464-5491.2006.01886.x)
No full textIn an article by Marfella et al, the author name C. Saron is incorrect and should be listed as C. Sardu. Therefore the correct author list is: R. Marfella, F. Cacciapuoti, M. Siniscalchi, F. C. Sasso, F. Marchese, F. Cinone, E. Musacchio, M. A. Marfella, L. Ruggiero, G. Chiorazzo, D. Liberti, G. Chiorazzo, G. F. Nicoletti, C. Sardu, F. D'Andrea, C. Ammendola, M. Verza and L. Coppola.In an article by Marfella et al, the author name C. Saron is incorrect and should be listed as C. Sardu. Therefore the correct author list is: R. Marfella, F. Cacciapuoti, M. Siniscalchi, F. C. Sasso, F. Marchese, F. Cinone, E. Musacchio, M. A. Marfella, L. Ruggiero, G. Chiorazzo, D. Liberti, G. Chiorazzo, G. F. Nicoletti, C. Sardu, F. D'Andrea, C. Ammendola, M. Verza and L. Coppola
Volatility Dynamics in Foreign Exchange Rates: Further Evidence from the Malaysian Ringgit and Singapore Dollar
No full textSingapore dollar are analyzed in this paper. Our approach can simultaneously capture the empirical regularities of persistent and asymmetric effects in volatility and timevarying correlations of financial time series. Consistent with the results of Tse and Tsui (1997), there is only some weak support for asymmetric volatility in the case of the Malaysian ringgit when the two currencies are measured against the US dollar. However, there is strong evidence that depreciation shocks have a greater impact on future volatility levels compared with appreciation shocks of the same magnitude when both currencies measured against the yen. Moreover, evidence of time-varying correlation is highly significant when both currencies are measured against the yen. Regardless of the choice of the numeraire currency and the volatility models, shocks to exchange rate volatility are found to be significantly persistent.Constant correlations; Exchange rate volatility; Fractional integration; Long memory; Bivariate asymmetric GARCH; Varying correlations
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
De Maiestate / Praeside M. Jacobo Thomasio, Moralis Philosoph. P. P., publice disputabit Johannes Dunte, R. L. Author & Respon: ad diem 9. Septembr. H L. Q. C.
No full textDE MAIESTATE / PRAESIDE M. JACOBO THOMASIO, MORALIS PHILOSOPH. P. P., PUBLICE DISPUTABIT JOHANNES DUNTE, R. L. AUTHOR & RESPON: AD DIEM 9. SEPTEMBR. H L. Q. C.
De Maiestate / Praeside M. Jacobo Thomasio, Moralis Philosoph. P. P., publice disputabit Johannes Dunte, R. L. Author & Respon: ad diem 9. Septembr. H L. Q. C. (1)
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