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Search Results: 1 - 10 of 323053 matches for " Pedro J. Castro "
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Experimental Study on Split-Ring Resonators with Different Slit Widths  [PDF]
Pedro J. Castro, Joaquim J. Barroso, Joaquim P. Leite Neto
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2013, DOI: 10.4236/jemaa.2013.59058
Abstract:

Metamaterial one-dimensional periodic structures are composed of split-ring resonators, which can display electric permittivity and magnetic permeability simultaneously negative, are studied experimentally. In the present study, each resonator is made up of two concentric circular copper rings patterned on a substrate of kapton, with slits diametrically opposite each other and with the line of the splits along the longitudinal direction of the periodic array containing seven split rings evenly spaced. The experiments consist in inserting the metamaterial slab into a square waveguide of side length 6 mm, corresponding to a cutoff frequency of 25 GHz. Transmission bands due to magnetic and electrical responses are identified for slits with aperture widths of 1 mm and 2 mm, centered at 5.67 and 6.12 GHz frequencies, respectively, values well below the 25 GHz frequency cutoff, so characterizing a medium with negative permeability and

Exploring the effects of depression and treatment of depression in reinforcement learning
Pedro Castro-Rodrigues,Albino J. Oliveira-Maia
Frontiers in Integrative Neuroscience , 2013, DOI: 10.3389/fnint.2013.00072
Abstract:
El caudillismo en América Latina, ayer y hoy
Castro, Pedro;
Política y cultura , 2007,
Abstract: the work approaches the phenomenon of 'caudillismo' (military leadership) like a figure of latin american history still permanent to the present day. bound to the decay of the colonial authority, it is distinctive of several countries in the nineteen century. it is consequence of the collapse of the central government (mexico) and of fractures in the state apparatus and of the ascent of social mass movements with charismatic leaders (argentina and brazil) in the twenties. at the beginning of the present century, hugo chávez has several characteristics that suggest him like a postmodern caudillo: has control of the resources derived from the oil and the handling of mass media, fundamental assets for the movement around its person.
El caudillismo en América Latina, ayer y hoy
Pedro Castro
Política y cultura , 2007,
Abstract: The work approaches the phenomenon of caudillismo (military leadership) like a figure of Latin American history still permanent to the present day. Bound to the decay of the colonial authority, it is distinctive of several countries in the nineteen century. It is consequence of the collapse of the central government (Mexico) and of fractures in the state apparatus and of the ascent of social mass movements with charismatic leaders (Argentina and Brazil) in the twenties. At the beginning of the present century, Hugo Chávez has several characteristics that suggest him like a postmodern caudillo: has control of the resources derived from the oil and the handling of mass media, fundamental assets for the movement around its person.
Qué es el Sindicato de Profesores de la Universidad Autónoma Metropolitana (SPAUAM)?
Pedro Castro
El Cotidiano , 2002,
Abstract: Los fundadores del SPAUAM sabemos que el sindicalismo a la usanza tradicional está en decadencia. La reforma laboral que ahora se discute, así como el desmantelamiento del corporativismo y sus instrumentos, queriéndolo o no plantearán nuevas formas de organización laboral. El SPAUAM reivindica el derecho a la huelga como facultad irrenunciable de quienes trabajan, así como la representación democrática de sus miembros. El reto mayor está en cómo hacerlos de la mayor efectividad en los tiempos que vivimos. Formas inéditas de trabajo serán puestas en práctica, tanto para defender a la Universidad de sus enemigos como para hacer valer los derechos legítimos de los académicos y de los demás miembros de la comunidad.
Armazenamento refrigerado da uva de mesa 'Romana' (A1105) cultivada sob cobertura plástica
Lulu, Jorge;Castro, Josalba V.;Pedro Júnior, Mário J.;
Engenharia Agrícola , 2005, DOI: 10.1590/S0100-69162005000200022
Abstract: the grapevine is one of the most cultivated fruit crop and nowadays the preference for seedless grapes is gradualy increasing in the brazilian internal market. the table grape cultivar 'romana' (a1105) has been showing potential as a new option for the growers from jundiaí - sp, brazil, as a seedless grape. however the bunch quality has been affected by rain at the harvest allowing the incidence of cracking and bunch rot. aiming to solve this problem a field trial was carried out with grapes cultivated under plastic cover and geneva double curtain training system. after harvest, eight samples of six bunches each were taken and stored at 3 oc and evaluated for quality during a period of 36 days. after three weeks of storage, the weight loss was higher than 6%, showing bunch fade and the rot bunch increased significantly. it was concluded that maximum shelf life for the 'romana' (a1105) table grape cultivar was 21 days.
Fenologia e estimativa da dura??o do ciclo da zínia 'Profusion Cherry' cultivada em vasos em ambiente protegido
Gon?alves, Charleston;Pedro Júnior, Mário José;Castro, Carlos Eduardo Ferreira de;
Bragantia , 2008, DOI: 10.1590/S0006-87052008000200030
Abstract: phenology of potted zinnia 'profusion cherry' grown in a greenhouse with plastic cover was evaluated for weekly sowing dates from: 2/4/05 to 6/17/05. the length of plant cycle was influenced by air temperature and photoperiod. the average length of the phase sowing to first open flower varied from 39 days for the sowing dates of 03/11/05 and 03/18/05 to 63 days for 06/10/05. it was also showed that estimates of the length (d) of the period sowing to first open flower could be obtained by the following equation: 1/d = 0.019108 + 0.001968 t - 0.00352 f (r2 = 0.99) where, t is the mean air temperature (oc) and f is the mean photoperiod (hours).
época de florescimento e horas de frio para pessegueiros e nectarineiras
Pedro Júnior, Mario José;Barbosa, Wilson;Rolim, Glauco de Souza;Castro, Jairo Lopes de;
Revista Brasileira de Fruticultura , 2007, DOI: 10.1590/S0100-29452007000300005
Abstract: blossom dates for 41 peaches and nectarines accesses from the active gene bank (bag) of stone fruits were evaluated at cap?o bonito (sp), brazil. observations of flowering date (70% of opened flowers) were taken and compared to the chilling hour's requirement (nhf) considering 7.2 and 13oc. the nhf was estimated using multiple regression equations based on maximum and minimum temperature. the accesses from the bag were separated by cluster analysis into four groups for peaches and three for nectarines by cluster analysis. the following peaches accesses: iac 2485-6, iac 680-13 and régis and for nectarine: iac n 785- 9 showed flowering date before july 10th with nhf less than 40 and 500, below 7.2 and 13oc, respectively. the peach cultivars eldorado, diamante, arlequim, bol?o, and marli showed blossom dates after august 1st, requiring more than 70 and 650 nhf bellow 7.2 and 13oc, respectively. the main peach cultivars for s?o paulo state like: aurora-1, dourad?o and dourado-1, flowered from july 11 to 20 with nhf from 41 to 50 bellow 7.2oc and from 501 to 560 bellow 13oc.
Efeito do microclima na qualidade da uva de mesa 'Romana' (A 1105) cultivada sob cobertura plástica
Lulu, Jorge;Castro, Josalba Vidigal de;Pedro Júnior, Mário José;
Revista Brasileira de Fruticultura , 2005, DOI: 10.1590/S0100-29452005000300020
Abstract: the grapevine is an important crop grown worldwide and nowadays the preference by seedless grapes is increasing in the brazilian market. the cultivar 'romana' (a 1105) is showing great potential as a new seedless table grape for the growing region of jundiaí, s?o paulo, brazil. however, the bunch quality has been influenced by rain during the harvest period, leading to incidence of berry cracking and rot. aiming to verify the possibility of growing this table grape under plastic cover conditions a field trial was done in a vineyard grown in jundiaí, aiming to quantify microclimatic parameters inside and outside of the protected environment; the bunch quality at harvest and the period of cold storage of bunchs (post-harvest time). the average values of solar radiation transmissivity were decreasing as follow: effect of the plastic cover only> effect of the grapevine training system only> and combined effect of the plastic cover and training system. analising the bunch quality parameters at harvest, significantly lower values of bunch rot were found for the plastic cover treatment in relation to the open sky grapevines. also, the bunch weight was higher in the plastic cover treatment. the defects like deep and superficial damage were lower for the bunch harvested in the plastic cover treatment. so, it was concluded that the use of plastic cover for the 'romana' (a 1105) table grape led to a better bunch quality, mainly due to the reduction of rot bunch incidence.
Abstract
Manuel J. M. de Freitas,Paulo M. S. Tavares de Castro,Pedro P. Camanho
Ciência & Tecnologia dos Materiais , 2008,
Abstract:
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