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Search Results: 1 - 10 of 223846 matches for " R. Modolo "
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Influence of the solar EUV flux on the Martian plasma environment
R. Modolo, G. M. Chanteur, E. Dubinin,A. P. Matthews
Annales Geophysicae (ANGEO) , 2005,
Abstract: The interaction of the solar wind with the Martian atmosphere and ionosphere is investigated by using three-dimensional, global and multi-species hybrid simulations. In the present work we focus on the influence of the solar EUV flux on the Martian plasma environment by comparing simulations done for conditions representative of the extrema of the solar cycle. The dynamics of four ionic species (H+, He++, O+, O2+), originating either from the solar wind or from the planetary plasma, is treated fully kinetically in the simulation model in order to characterize the distribution of each component of the plasma, both at solar maximum and at solar minimum. The solar EUV flux controls the ionization frequencies of the exospheric species, atomic hydrogen and oxygen, as well as the density, the temperature, and thus the extension of the exosphere. Ionization by photons and by electron impacts, and the main charge exchange reactions are self-consistently included in the simulation model. Simulation results are in reasonable agreement with the observations made by Phobos-2 and Mars Global Surveyor (MGS) spacecraft: 1) the interaction creates a cavity, void of solar wind ions (H+, He++), which depends weakly upon the phase of the solar cycle, 2) the motional electric field of the solar wind flow creates strong asymmetries in the Martian environment, 3) the spatial distribution of the different components of the planetary plasma depends strongly upon the phase of the solar cycle. The fluxes of the escaping planetary ions are computed from the simulated data and results for solar maximum are compared with estimates based on the measurements made by experiments ASPERA and TAUS on board Phobos-2.
Simulated solar wind plasma interaction with the Martian exosphere: influence of the solar EUV flux on the bow shock and the magnetic pile-up boundary
R. Modolo, G. M. Chanteur, E. Dubinin,A. P. Matthews
Annales Geophysicae (ANGEO) , 2006,
Abstract: The solar wind plasma interaction with the Martian exosphere is investigated by means of 3-D multi-species hybrid simulations. The influence of the solar EUV flux on the bow shock and the magnetic pile-up boundary is examined by comparing two simulations describing the two extreme states of the solar cycle. The hybrid formalism allows a kinetic description of each ions species and a fluid description of electrons. The ionization processes (photoionization, electron impact and charge exchange) are included self-consistently in the model where the production rate is computed locally, separately for each ionization act and for each neutral species. The results of simulations are in a reasonable agreement with the observations made by Phobos 2 and Mars Global Surveyor spacecraft. The position of the bow shock and the magnetic pile-up boundary is weakly dependent of the solar EUV flux. The motional electric field creates strong asymmetries for the two plasma boundaries.
Produ??o de frutos de quiabeiro a partir de mudas produzidas em diferentes tipos de bandejas e substratos
Modolo, Valéria A.;Tessarioli Neto, Jo?o;Ortigozza, Luís Enrique R.;
Horticultura Brasileira , 2001, DOI: 10.1590/S0102-05362001000100008
Abstract: this study proposed to evaluate the production of okra fields established by using seedling transplant. the experiment was carried out in a greenhouse at the escola superior de agricultura "luiz de queiroz" in s?o paulo, brazil. trays with different cell size were used in the okra seedling production. the substrates used were a blend of a commercial mixture (gioplanta). a completely randomized block design, with 3 x 4 factorial arrangement (3 types of trays and 4 different substrates) was used, in a total of 12 treatments. in the field 30 seedlings per each treatment were transplanted using 1,0 m between rows and 0,5 m within each plant in the row. each plot was constituted by 5 rows of 3,0 m and area of 15 m2. commercial fruits size (8 - 10 cm length) were harvested from the 12 central plants 49 days after seedling transplanting. number and fruit weight were evaluated. in the field the plants grown in largest cell volume produced more fruits than plants from small cell volume, regardless of the substrate. the lowest yield was obtained when gii and carbonized rice hulls were mixed (1:1) in the seedling production, independently of the tray type used.
Occurrence of Campylobacter in the genitals of teaser bulls maintained at an embryo transfer center
Modolo, J.R.;Lopes, C.A M.;Genari, T.;
Arquivo Brasileiro de Medicina Veterinária e Zootecnia , 2000, DOI: 10.1590/S0102-09352000000200002
Abstract: em central de transferência de embri?es, após os procedimentos de reconhecimento do cio em 37 vacas receptoras, através de quatro rufi?es vasectomizados, observou-se que 83% delas apresentavam retorno ao cio e algum corrimento serofibrinoso. nos exames bacteriológicos realizados nos lavados prepuciais dos rufi?es foi isolado o campylobacter fetus subsp. venerealis em todos, fato que, analisado associadamente com o retorno ao cio das vacas receptoras, é indicativo da ocorrência de campilobacteriose no plantel. essa ocorrência demonstra a necessidade de medidas eficazes de planejamento de saúde animal, pela utiliza??o de rufi?es com desvio lateral do pênis. uma vez impossibilitado o contato sexual, seria impedida a transmiss?o do agente durante o coito. torna-se imperioso consignar que a prática da preven??o racional de enfermidades continua sendo o procedimento mais econ?mico para uma produtividade animal mais rentável.
Occurrence of Campylobacter in the genitals of teaser bulls maintained at an embryo transfer center
Modolo J.R.,Lopes C.A M.,Genari T.
Arquivo Brasileiro de Medicina Veterinária e Zootecnia , 2000,
Abstract: Em central de transferência de embri es, após os procedimentos de reconhecimento do cio em 37 vacas receptoras, através de quatro rufi es vasectomizados, observou-se que 83% delas apresentavam retorno ao cio e algum corrimento serofibrinoso. Nos exames bacteriológicos realizados nos lavados prepuciais dos rufi es foi isolado o Campylobacter fetus subsp. venerealis em todos, fato que, analisado associadamente com o retorno ao cio das vacas receptoras, é indicativo da ocorrência de campilobacteriose no plantel. Essa ocorrência demonstra a necessidade de medidas eficazes de planejamento de saúde animal, pela utiliza o de rufi es com desvio lateral do pênis. Uma vez impossibilitado o contato sexual, seria impedida a transmiss o do agente durante o coito. Torna-se imperioso consignar que a prática da preven o racional de enfermidades continua sendo o procedimento mais econ mico para uma produtividade animal mais rentável.
Cinética dos anticorpos de origem colostral contra a toxina épsilon de Clostridium perfringens tipo D em cordeiros
Costa, Heni F.;Babboni, Selene D.;Rodrigues, Carlos F.C.;Padovani, Carlos R.;Dutra, Iveraldo S.;Modolo, José R.;
Pesquisa Veterinária Brasileira , 2012, DOI: 10.1590/S0100-736X2012000100004
Abstract: enterotoxemia, a disease that affect small ruminants, is caused mainly by the epsilon toxin from clostridium perfringens type d. this study evaluated the kinetics of epsilon antitoxin colostral antibodies in lambs born to ewes submitted to two different types of health management. a group of pregnant ewes (n=6) was vaccinated with a single dose of commercial vaccine against polyvalent clostridial toxoid containing epsilon in its formulation some 30 days before the expected date of birth. another group of ewes (n=6) of the same gestational age were not vaccinated. immediately after birth, before intake of colostrum, blood samples were collected from their lambs as well as 30 and 60 days of age for serum evaluation by elisa. the results allow to conclude that vaccination of pregnant ewes 30 days before parturition allowed the transfer of colostral antibodies specific enough to guarantee the immunity considered protective (0,5ui/ml) of the newborn lamb against enterotoxemia until its entry into the feedlot, with 60 days of age.
The comparison of the Butzler medium, filtration technique and their association with isolation of Campylobacter ssp
Modolo, José Rafael;
Revista da Sociedade Brasileira de Medicina Tropical , 2000, DOI: 10.1590/S0037-86822000000200011
Abstract: campylobacter was isolated in 178 out of 622 stool samples (200 porcine, 220 bovine, and 202 canine). from these 178 samples, the microorganism was identified in 64 samples (36%) isolated only in butzler selective medium (bsm), 34 samples (19%) using filtration technique (ft), and in 80 samples (45%) using both bsm and ft. comparison of the proportion of positivity using both techniques showed a significant value (c2 = 9,184; p > 0.001); bsm (36%) being more efficient than ft (19%). the use of both techniques yielded the highest isolation positivity (45%).
The comparison of the Butzler medium, filtration technique and their association with isolation of Campylobacter ssp
Modolo José Rafael
Revista da Sociedade Brasileira de Medicina Tropical , 2000,
Abstract: Campylobacter was isolated in 178 out of 622 stool samples (200 porcine, 220 bovine, and 202 canine). From these 178 samples, the microorganism was identified in 64 samples (36%) isolated only in Butzler selective medium (BSM), 34 samples (19%) using filtration technique (FT), and in 80 samples (45%) using both BSM and FT. Comparison of the proportion of positivity using both techniques showed a significant value (c2 = 9,184; p > 0.001); BSM (36%) being more efficient than FT (19%). The use of both techniques yielded the highest isolation positivity (45%).
Plasma boundary variability at Mars as observed by Mars Global Surveyor and Mars Express
N. J. T. Edberg, D. A. Brain, M. Lester, S. W. H. Cowley, R. Modolo, M. Fr nz,S. Barabash
Annales Geophysicae (ANGEO) , 2009,
Abstract: We have used Mars Express (MEX) and Mars Global Surveyor (MGS) simultaneous and non-simultaneous measurements to study the Martian plasma environment. In particular, we have derived quantitative expressions for the altitude of the terminator bow shock (BS) and magnetic pileup boundary (MPB) as functions of solar wind dynamic pressure, crustal magnetic fields and solar EUV flux. We have also studied the influence of the interplanetary magnetic field (IMF) direction. Through simultaneous two-spacecraft case studies we have shown that the dynamic pressure has a strong influence on the location and shape of these boundaries, which is also confirmed through a large statistical study. A higher dynamic pressure pushes the boundaries downward. The IMF direction has a weaker but still significant influence on both boundaries and causes them to move outward in the hemisphere of locally upward electric field. However, the MPB in the Southern Hemisphere is found to actually move inward when the electric field is directed locally upward. The crustal magnetic fields in the Southern Hemisphere have a strong influence on the MPB and cause it to move to higher altitudes over strong crustal magnetic fields. The influence of the crustal magnetic fields on the BS is more ambiguous since there are few crossings over the strongest crustal fields, but there appears to be at least a small trend of a higher BS for stronger crustal fields. An increased solar EUV flux has been found to cause the BS to move outward and the MPB to move inward.
Comportamento de três hortali as de fruto submetidas ao aquecimento intermitente durante a frigoconserva o
KLUGE R.A.,MODOLO V.A.,JACOMINO A.P.,SCARPARE FILHO J.A.
Scientia Agricola , 1998,
Abstract: Efeitos do aquecimento intermitente foram estudados em berinjelas, piment es e quiabos refrigerados. Berinjelas `Piracicaba F-100' foram continuamente refrigeradas por 21 dias ou aquecidas a cada 3, 4, 5 ou 6 dias. Piment es `Maiata' foram continuamente refrigerados por 28 dias ou aquecidos a cada 5, 6, 7 ou 8 dias. Quiabos `Santa Cruz-47' foram continuamente refrigerados por 8 dias, ou aquecidos aos 2, 3, 4 ou 5 dias. O armazenamento foi realizado à 5oC e 90-95% UR. O aquecimento foi realizado por 24 horas à 24-25oC e 70-75% UR (condi es ambientais). O aquecimento intermitente reduziu os sintomas de injúrias pelo frio, mas provocou elevadas perdas de massa em muitos tratamentos, causando murchamento e reduzindo a comerciabilidade dos frutos após a refrigera o, principalmente em quiabos e piment es.
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