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Search Results: 1 - 10 of 8579 matches for " Bruno Shigueo Iwamoto "
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Desempenho de bovinos em capim-tanzania adubado com nitrogênio ou consorciado com Estilosantes Performance of beef cattle grazing Tanzania grass fertilized with nitrogen or intercropped with Stylo
Ossival Lolato Ribeiro,Ulysses Cecato,Bruno Shigueo Iwamoto,Alyson Pinheiro
Revista Brasileira de Saúde e Produ??o Animal , 2011,
Abstract: Com este estudo objetivou-se avaliar a massa seca de forragem e laminas foliares, ganho médio diário, taxa de lota o e ganho de peso vivo em capim-tanzania (Panicum maximum Jacq.) no período de novembro de 2008 a julho de 2009 sob lota o contínua. Utilizou-se delineamento experimental em blocos ao acaso em parcela subdivididas, com três repeti es, e como tratamentos: Tanzania + Estilosantes Campo Grande; Tanzania + 75kg/ha de N; Tanzania + 150kg/ha de N e Tanzania + 225kg/ha de N, e nas sub-parcelas os períodos do ano: primavera, ver o e outono. No ver o, a massa seca de forragem e laminas foliares foram superiores à primavera e outono. O tratamento com 225kg de N apresentou maior massa seca de forragem e massa seca de laminas foliares no ver o e outono. Obteve-se maior ganho médio diário no ver o. Na primavera e no ver o n o houve diferen a entre os tratamentos para o ganho médio diário, e no outono o tratamento com 225kg/ha de N foi superior. A taxa de lota o foi semelhante no ver o e outono, e menor na primavera. O tratamento com 225kg de N apresentou maior taxa de lota o na primavera e ver o. O tratamento com 225kg de N apresentou maior ganho de peso vivo no outono, na primavera e ver o o 150 kg de N foi semelhante. A disponibilidade de massa seca de forragem e o desempenho animal proporcionado pelo Estilosantes foram equivalentes à aduba o nitrogenada até a dose de 75kg de N. This study aimed to evaluate the dry mass of forage and leaf blade dry mass, average daily gain, stocking rate and live weight gain in Tanzania grass (Panicum maximum Jacq.) from November/2008 to July/2009, on continuous stocking. The experimental design was a split-plot arrangement in a randomized blocks design, with three replications and four treatments: Tanzania + Campo Grande Stylo; Tanzania + 75kg/ha of N; Tanzania + 150kg/ha of N and Tanzania + 225kg/ha of N, subplots were the seasons of the year: Spring, Summer and Autumn. The forage dry mass and leaf blade dry mass was higher in Summer compared to Spring and Autumn. The treatment with 225kg of N presented higher dry mass of forage and leaf blade dry mass in Summer and Autumn. It was obtained the higher average daily gain in the Summer. In the Spring and Summer no differences were observed for average daily gain, but in the Autumn the treatment with 225kg/ha of N was the best. The stocking rate was similar in Summer and Autumn, but lower in Spring. The treatment with 225kg of N presented the higher stocking rate in Spring and Summer. The treatment with 225kg of N presented the higher live weight gain in Autumn, w
Morphogenetic and tillering dynamics in Tanzania grass fertilized and non-fertilized with nitrogen according to season
Roma, Cláudio Fabrício da Cruz;Cecato, Ulysses;Soares Filho, Cecílio Viega;Santos, Geraldo Tadeu dos;Ribeiro, Ossival Lolato;Iwamoto, Bruno Shigueo;
Revista Brasileira de Zootecnia , 2012, DOI: 10.1590/S1516-35982012000300013
Abstract: the objectives of this study were to evaluate morphogenetic characteristics and tillering dynamics in tanzania grass fertilized and non-fertilized with nitrogen, under intermittent grazing, in the spring and the summer. the main plots were composed of four nitrogen rates (0, 100, 200 and 300 kg/ha) and the subplots were growth seasons: spring (october, november and december) and summer (january, february and march). the experimental design was of randomized block with plots subdivided by time (seasons of the year) and four replications. urea was used as nitrogen supply and was divided into two applications: one in the spring and another in the summer. the experimental units fertilized with n rates of 200 and 300 kg/ha showed six cycles of pasture, with an average of 27 days of pasture interval, while the treatments with no fertilization and 100 kg/ha of n showed only four and five cycles of pasture, respectively. leaf elongation rate (ler) and the leaf appearance rate (lar) increased linearly with increasing of n rates. the greatest population density occurred in summer with the higher nitrogen rates. the treatment without n fertilization showed the lowest growth of tiller population, while the other treatments exhibited growth rates above 50% when compared with non-fertilized samples. nitrogen rates significantly affect the leaf appearance rate and the leaf elongation rate, as well as the number of live leaves in plants of tanzania grass in both spring and summer.
Revision and systematic placement of Prospalaea Aldrich (Diptera, Tachinidae)
Nihei, Silvio Shigueo;
Papéis Avulsos de Zoologia (S?o Paulo) , 2006, DOI: 10.1590/S0031-10492006001600001
Abstract: revision and systematic placement of prospalaea aldrich (diptera, tachinidae). in the present study, the genotype and single species prospalaea insularis (brauer & bergenstamm, 1891) is redescribed and the male terminalia fully illustrated. the species is known only from a single type specimen collected from the caribbean subregion, which was examined for this study. a new systematic placement is proposed, with the genus being transferred from the exoristini to eryciini, both tribes of exoristinae.
Polietina Schnabl & Dziedzicki (Diptera, Muscidae): description of the male of P. major Albuquerque and female of P. wulpi Couri & Carvalho
Nihei, Silvio Shigueo;
Revista Brasileira de Entomologia , 2002, DOI: 10.1590/S0085-56262002000400006
Abstract: polietina schnabl & dziedzicki, 1911 (diptera, muscidae) is a new world genus of muscini, which comprises 18 species. the male of p. major albuquerque, 1956 and the female of p. wulpi couri & carvalho, 1997 are herein described and illustrated for the first time. new geographical localities are recorded for both species.
Review of the type material of three species of Polietina Schnabl & Dziedzicki (Diptera, Muscidae)
Nihei, Silvio Shigueo;
Revista Brasileira de Entomologia , 2004, DOI: 10.1590/S0085-56262004000100003
Abstract: the type material of three species of polietina schnabl & dziedzicki, 1911 was examined. polietina flavidicincta (stein, 1904) is redescribed and a lectotype is designated; p. stellata (couri, 1982) is considered junior synonym of p. flavithorax (stein, 1904), and for the latter a lectotype is designated. the neotype previously designated is considered invalid.
Catálogo do material-tipo de Tachinidae (Diptera) depositado no Museu de Zoologia da Universidade de S?o Paulo
Toma, Ronaldo;Nihei, Silvio Shigueo;
Revista Brasileira de Entomologia , 2006, DOI: 10.1590/S0085-56262006000200006
Abstract: catalogue of the type-material of tachinidae deposited at the museu de zoologia da universidade de s?o paulo. the museu de zoologia da universidade de s?o paulo (brazil) houses the largest and most representative brazilian collection of diptera. the tachinidae collection appears as the second most numerous, with a total of 32554 mounted adult specimens. in the present study, it is presented a catalogue of primary and secondary type-specimens deposited at the museu de zoologia, providing information on collecting data, preserving conditions, as well as the taxonomic status of specific names and its current generic placement, whenever different from the original combination. the catalogue lists a total of 847 type-specimens (99 holotypes, 737 paratypes, 8 syntypes, 1 lectotype, 1 paralectotype and 1 neotype) representing 263 nominal species of tachinidae, mostly from the neotropical region. also, the specimens with dubious status (if type or not) are listed. a short biography of charles henry tyler townsend and josé henrique guimar?es is presented.
One Step Formation of Propene from Ethene or Ethanol through Metathesis on Nickel Ion-loaded Silica
Masakazu Iwamoto
Molecules , 2011, DOI: 10.3390/molecules16097844
Abstract: Increased propene production is presently one of the most significant objectives in petroleum chemistry. Especially the one-step conversion of ethene to propene (ETP reaction, 3C2H4 ? 2C3H6) is the most desired process. In our efforts, nickel ion-loaded mesoporous silica could turn a new type of ETP reaction into reality. The one-step conversion of ethene was 68% and the propene selectivity was 48% in a continuous?gas-flow system at 673 K and atmospheric pressure. The reactivity of lower olefins and the dependences of the ETP reaction on the contact time and the partial pressure of ethene were consistent with a reaction mechanism involving dimerization of ethene to 1-butene, isomerization of 1-butene to 2-butene, and metathesis of 2-butene and ethene to yield propene. The reaction was then expanded to an ethanol-to-propene reaction on the same catalyst, in which two possible reaction routes are suggested to form ethene from ethanol. The catalysts were characterized mainly by EXAFS and TPR techniques. The local structures of the nickel species active for the ETP reaction were very similar to that of layered nickel silicate, while those on the inert catalysts were the same as that of NiO particles.?
LHC SUSY searches after the Higgs discovery: respecting the muon g-2
Iwamoto, Sho
High Energy Physics - Phenomenology , 2013,
Abstract: SUSY searches at the LHC as well as the 126 GeV Higgs boson indicate that superparticles, especially squarks and gluinos, are not so light as we expected. It is important to investigate SUSY searches which do not rely on the colored superparticles. As a clue for the investigation, we focus on the muon g-2 anomaly, which can be explained by the SUSY contributions if some of neutralinos, charginos, and sleptons are as light as of order 100 GeV. We propose the muon-(g-2)-motivated MSSM as a benchmark model, where squarks are decoupled but the superparticles corresponding to the muon g-2 are light enough to explain the anomaly. We also interpret the up-to-date results of LHC SUSY searches, and obtain experimental constraints on the model. We show searches for direct production of charginos and neutralinos work very well against the scenario, but several regions are not only remain uncovered but even found challenging to be searched for at the LHC. It is ascertained that, in order to draw out latent potential of the LHC, strategies to attack these regions should be developed.
On the Radio-to-X-ray light curves of SN 1998bw and GRB 980425
K. Iwamoto
Physics , 1998, DOI: 10.1086/311867
Abstract: We calculate radio-to-X-ray light curves for afterglows caused by non-thermal emission from a highly relativistic blast wave, which is inferred from the gamma-ray flux detected in GRB 980425 and from the very bright radio emission detected in SN 1998bw. We find that the observed gamma-ray and radio light curves are roughly reproduced by the synchrotron emission from a relativistic fireball. The optical flux predicted for the non-thermal emission is well below that of the thermal emission observed for SN 1998bw so that it will not be seen at least for a few years. The model predicts the X-ray flux just above the detection limit of BeppoSAX for the epoch when it was pointed to the field of GRB980425. Therefore, the nondetection of X-ray and optical afterglows is consistent with the model. The models presented here are consistent with the physical association between SN 1998bw and GRB980425, and lend further support to the idea that this object might correspond to an event similar to the ``hypernova'' or ``collapsar'' -- events in which the collapse of a massive star forms a rotating black hole surrounded by a disk of the remnant stellar mantle.
Effects of Relativistic Expansion on the Late-time Supernova Light Curves
Koichi Iwamoto
Physics , 2002, DOI: 10.1093/pasj/54.4.L63
Abstract: The effects of relativistic expansion on the late-time supernova light curves are investigated analytically, and a correction term to the (quasi-)exponential decay is obtained by expanding the observed flux in terms of (\beta), where (\beta) is the maximum velocity of the ejecta divided by the speed of light (c). It is shown that the Doppler effect brightens the light curve owing to the delayed decay of radioactive nuclei as well as to the Lorentz boosting of the photon energies. The leading correction term is quadratic in (\beta), thus being proportional to (E_{\rm k}/(M_{\rm ej} c^2)), where (E_{\rm k}) and (M_{\rm ej}) are the kinetic energy of explosion and the ejecta mass. It is also shown that the correction term evolves as a quadratic function of time since the explosion. The relativistic effect is negligibly small at early phases, but becomes of considerable size at late phases. In particular, for supernove having a very large energy(hypernova) or exploding in a jet-like or whatever non-spherical geometry, (^{56})Ni is likely to be boosted to higher velocities and then we might see an appreciable change in flux. However, the actual size of deviation from the (quasi-)exponential decay will be uncertain, depending on other possible effects such as ionization freeze-out and contributions from other energy sources that power the light curve.
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