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Search Results: 1 - 10 of 489379 matches for " M. V.;Morita "
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The Extragalactic Ionizing Background at Low Redshift
J. Scott,J. Bechtold,M. Morita,A. Dobrzycki,V. Kulkarni
Physics , 2001,
Abstract: We present a measurement of the mean intensity of the hydrogen-ionizing background radiation field at low redshift using 906 Ly-alpha absorption lines in 151 quasar spectra from the archives of the Faint Object Spectrograph on the Hubble Space Telescope. Using a maximum likelihood technique and the best estimates possible for each QSO's Lyman limit flux and systemic redshift, we find J(\nu_{0})= 7.6^{+9.4}_{-3.0} x 10^{-23} ergs s^{-1} cm^{-2} Hz^{-1} sr^{-1} at 0.03 < z < 1.67. This is in good agreement with the mean intensity expected from models of the background which incorporate only the known quasar population. When the sample is divided into two subsamples, consisting of lines with z < 1 and z > 1, the values of J(\nu_{0}) found are 6.5^{+38.}_{-1.6} x 10^{-23} ergs s^{-1} cm^{-2} Hz^{-1} sr^{-1}, and 1.0^{+3.8}_{-0.2} x 10^{-22} ergs s^{-1} cm^{-2} Hz^{-1} sr^{-1}, respectively, indicating that the mean intensity of the background is evolving over the redshift range of this data set. Relaxing the assumption that the spectral shapes of the sample spectra and the background are identical, the best fit HI photoionization rates are found to be 6.7 x 10^{-13} s^{-1} for all redshifts, and 1.9 x 10^{-13} s^{-1} and 1.3 x 10^{-12} s^{-1} for z < 1 and z > 1, respectively.
Oxygen Stoichiometry in Co-1212, Co-1222 and Co-1232 of Homologous Series Co-12s2 of Category-B Layered Copper Oxides
Y. Morita,V. P. S. Awana,H. Yamauchi,M. Karppinen
Physics , 2002,
Abstract: Here results of a systematic study on oxygen stoichiometry are reported for the first three members of the novel CoSr2(Y,Ce)sCu2O5+2s or Co-12s2 homologous series, i.e. Co-1212, Co-1222 and Co-1232 phases with a SrO-CoO1-SrO-CuO2-(Y,Ce)-[O2-(Y,Ce)]s-1-CuO2 layered structure. The oxygen content was precisely determined by two independent chemical techniques: coulometric Cu+/Cu2+ titration and iodometric titration. Furthermore, oxygen stability/tunability was investigated by means of oxygenative and reductive an-nealings carried out in a thermobalance. It was revealed that all the three phases are rather stoichiometric in oxygen content and stable against both oxygenative and reductive an-nealings. The present results for the Co-12s2 homologous series suggest that not only the CoO1 charge reservoir but also the nominally oxygen-stoichiometric B-[O2-B]s-1 fluo-rite block, that is the characteristic structural element for the Co-12s2 (s > 1) phases and all other layered copper oxides of category-B [H. Yamauchi and M. Karppinen, Superlatt. Microstructr. 21A (1997) 128] is non-tunable in terms of the oxygen content.
Biological nitrogen removal over nitritation/denitritation using phenol as carbon source
Queiroz, L. M.;Aun, M. V.;Morita, D. M.;Alem Sobrinho, P.;
Brazilian Journal of Chemical Engineering , 2011, DOI: 10.1590/S0104-66322011000200004
Abstract: a laboratory scale activated sludge sequencing batch reactor was operated in order to obtain total removal of influent ammonia (200; 300 and 500 mg nh3-n.l-1) with sustained nitrite accumulation at the end of the aerobic stages with phenol (1,000 mg c6h5oh.l-1) as the carbon source for denitrifying microorganisms during the anoxic stages. ammonia removal above 95% and ratios of (no2--n / (no2--n + no3--n)) ranging from 89 to 99% were obtained by controlling the dissolved oxygen concentration (1.0 mg o2.l-1) and the ph value of 8.3 during the aerobic stages. phenol proved to be an adequate source of carbon for nitrogen removal via nitrite with continuous feeding throughout part of the anoxic stage. nitrite concentrations greater than 70.0 mg no2--n.l-1 inhibited the biological denitritation process.
Effects of correlations on the total neutron-Nucleus cross section at high energies
M. Alvioli,C. Ciofi degli Atti,I. Marchino,H. Morita,V. Palli
Physics , 2007,
Abstract: The total neutron-Nucleus cross section has been calculated within an approach which takes into account nucleon-nucleon correlations, Glauber multiple scattering and inelastic shadowing corrections. Nuclear targets ranging from 4He to 208Pb and neutron incident momentum ranging from 3 to 300 GeV/c, have been considered. Correlations have been introduced by two different approaches leading to the same results. The commonly used approximation, consisting in treating nuclear effects only by a product of one-body densities, is carefully analyzed and it is shown that the effects of realistic correlations resulting from modern nucleon-nucleon interactions and realistic correlations resulting from realistic nucleon-nucleon interactions and microscopic ground state calculation of nuclear properties cannot be disregarded.
Effects of Ground-State Correlations on High Energy Scattering off Nuclei: the Case of the Total Neutron-Nucleus Cross Section
M. Alvioli,C. Ciofi degli Atti,I. Marchino,V. Palli,H. Morita
Physics , 2008, DOI: 10.1103/PhysRevC.78.031601
Abstract: With the aim at quantitatively investigating the longstanding problem concerning the effect of short range nucleon-nucleon correlations on scattering processes at high energies, the total neutron-nucleus cross section is calculated within a parameter-free approach which, for the first time, takes into account, simultaneously, central, spin, isospin and tensor nucleon-nucleon (NN) correlations, and Glauber elastic and Gribov inelastic shadowing corrections. Nuclei ranging from 4He to 208Pb and incident neutron momenta in the range 3 GeV/c - 300 GeV/c are considered; the commonly used approach which approximates the square of the nuclear wave function by a product of one-body densities is carefully analyzed, showing that NN correlations can play a non-negligible role in high energy scattering off nuclei.
Tunable high-energy ion source via oblique laser pulse incidence on a double-layer target
T. Morita,T. Zh. Esirkepov,S. V. Bulanov,J. Koga,M. Yamagiwa
Physics , 2007, DOI: 10.1103/PhysRevLett.100.145001
Abstract: The laser-driven acceleration of high quality proton beams from a double-layer target, comprised of a high-Z ion layer and a thin disk of hydrogen, is investigated with three-dimensional particle-in-cell simulations in the case of oblique incidence of a laser pulse. It is shown that the proton beam energy reaches its maximum at a certain incidence angle of the laser pulse, where it can be much greater than the energy at normal incidence. The proton beam propagates at some angle with respect to the target surface normal, as determined by the proton energy and the incidence angle.
Development of a micro-heat exchanger with stacked plates using LTCC technology
Vásquez-Alvarez, E.;Degasperi, F. T.;Morita, L. G.;Gongora-Rubio, M. R.;Giudici, R.;
Brazilian Journal of Chemical Engineering , 2010, DOI: 10.1590/S0104-66322010000300012
Abstract: a green ceramic tape micro-heat exchanger was developed using low temperature co-fired ceramics technology (ltcc). the device was designed by using computational aided design software and simulations were made using a computational fluid dynamics package (comsol multiphysics) to evaluate the homogeneity of fluid distribution in the microchannels. four geometries were proposed and simulated in two and three dimensions to show that geometric details directly affect the distribution of velocity in the micro-heat exchanger channels. the simulation results were quite useful for the design of the microfluidic device. the micro-heat exchanger was then constructed using the ltcc technology and is composed of five thermal exchange plates in cross-flow arrangement and two connecting plates, with all plates stacked to form a device with external dimensions of 26 x 26 x 6 mm3.
Short Range Correlations in Medium- and High-Energy Scattering off Nuclei
M. Alvioli,C. Ciofi degli Atti,C. B. Mezzetti,V. Palli,S. Scopetta,L. P. Kaptari,H. Morita
Physics , 2008, DOI: 10.1063/1.3013057
Abstract: The effects of short range correlations in lepton and hadron scattering off nuclei at medium and high energies are discussed.
A Locus Identified on Chromosome18P11.31 is Associated with Hippocampal Abnormalities in a Family with Mesial Temporal Lobe Epilepsy
Cláudia V. Maurer-Morelli,Rodrigo Secolin,Márcia E. Morita,Rafael B. Marchesini,Fernando Cendes,Iscia Lopes-Cendes
Frontiers in Neurology , 2012, DOI: 10.3389/fneur.2012.00124
Abstract: We aimed to identify the region harboring a putative candidate gene associated with hippocampal abnormalities (HAb) in a family with mesial temporal lobe epilepsy (MTLE). Genome-wide scan was performed in one large kindred with MTLE using a total of 332 microsatellite markers at ~12 cM intervals. An additional 13 markers were genotyped in the candidate region. Phenotypic classes were defined according to the presence of hippocampal atrophy and/or hyperintense hippocampal T2 signal detected on magnetic resonance imaging. We identified a significant positive LOD score on chromosome 18p11.31 with a Zmax of 3.12 at D18S452. Multipoint LOD scores and haplotype analyses localized the candidate locus within a 6-cM interval flanked by D18S976 and D18S967. We present here evidence that HAb, which were previously related mainly to environmental risk factors, may be influenced by genetic predisposition. This finding may have major impact in the study of the mechanisms underlying abnormalities in mesial temporal lobe structures and their relationship with MTLE.
The Relationship among Cost-Reducing R&D Investment, Occupational Choice, and Trade  [PDF]
Tadashi Morita
Theoretical Economics Letters (TEL) , 2014, DOI: 10.4236/tel.2014.49111
Abstract: In this paper, I construct a two-country model in which oligopolistic firms export goods and undertake cost-reducing R&D investment. In this model, abilities of individual to become skilled worker are heterogeneous and they choose to become skilled worker or unskilled worker. Individuals have to incur the cost of education in order to become skilled workers. Each country imposes tariffs. When the cost of education is sufficiently high, a decrease in the tariff rate decreases the level of R&D investment. However, when the cost of education is sufficiently small, a decrease in the tariff rate increases the level of R&D investment.
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