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Search Results: 1 - 10 of 68678 matches for " José Frederico; "
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Energy Balance in a Patch of the Atlantic Forest in São Paulo City, Brazil  [PDF]
Frederico Luiz Funari, Augusto José Pereira Filho
Journal of Water Resource and Protection (JWARP) , 2014, DOI: 10.4236/jwarp.2014.69076

The aim of this work was to characterize and to bring into relationship of the net radiation with the latent heat flux equivalent to water (mm) in a patch of Atlantic Forest within the metropolitan area of Sao Paulo (RMSP). The estimation of the latent heat flux (LE) was made by the energy balance equation with the Bowen ratio. Measurements of net radiation and psychometrics gradients were made. Soil heat flux (G) was measured by temperature sensors in two depths. Measurements were made at Park of Science and Technology of Sao Paulo University (CIENTEC), Sao Paulo, Brazil, between 2011 and 2013. Results indicated that evapotranspiration varies seasonally and the amount of water evaporated exceeds 3.0 mm·day-1 in spring/summer and in autumn/winter the amount is approximately 1.0 mm·day-1. The evapotranspiration is increased under RMSP urban climate conditions with higher air temperature and lower moisture especially in summer season.

Availability of Information about Sustainable Bioenergy Technologies: The Agro-Energy Tree of Knowledge  [PDF]
José Gilberto Jardine, Esdras Sundfeld, Frederico Ozanan Machado Dur?es
Journal of Sustainable Bioenergy Systems (JSBS) , 2013, DOI: 10.4236/jsbs.2013.34035

In addition to the efforts undertaken by research institutions to generate new knowledge and technologies, it is also necessary to promote the results of this research. Specifically, there is a need for an information system that aggregates, organizes and systematizes information about agro-energy technology and makes it available on the Internet. Despite the abundance of information circulating on the internet in Brazil, a specific method for sharing valid scientific and technological information of practical interest, such as technical guidance and recommendations for processing various materials and production technologies for various forms of agro-energy, has not yet been established. This article presents the Agro-energy Tree of Knowledge, a tool developed by Embrapa to enable web access to comprehensive information about bioenergy production systems applied in different regions and conditions, in addition to texts, publications, statistical data about production and economic markets and information links related to agro-energy.

Wild boars (Sus scrofa scrofa) seminiferous tubules morphometry
Costa, Deiler Sampaio;Silva, José Frederico Straggiotti;
Brazilian Archives of Biology and Technology , 2006, DOI: 10.1590/S1516-89132006000600008
Abstract: the aim of this data was to analyze morphology and function of the seminiferous tubule in adult wild boars. testes removed by unilateral castration of five animals were used. the testicular parenchyma was composed by 82.1±2.2% of seminiferous tubule and 17.9±2.2% of intertubular tissue. the tubular diameter was 249.2±33.0 μm and the seminiferous tubule lenght per gram of testis was 19.3±4.9m. the spermatogonial mitoses efficiency coefficient, meiotic index and spermatogenesis efficiency were 10.34, 2.71 and 30.5 respectively. each sertoli cell supported about 13 germinatives cells. the hystometric parameters studied were very similar to those related for domestic boars, however, the wild boars intrinsic efficiency of spermatogenesis and sertoli cells indexes were smaller than in domestic boars.
Resistência à penetra??o em latossolos: valor limitante à produtividade de arroz de sequeiro
Beutler, Amauri Nelson;Centurion, José Frederico;
Ciência Rural , 2004, DOI: 10.1590/S0103-84782004000600019
Abstract: the objetive of this work was to evaluate the value of resistance to penetration limit to dry land rice yield (oryza sativa cv. iac 165) grown in soil with water content at tension of 0.05 and 0.01mpa. soil was sampled at 0.00-0.20m depth in haplustox, medium texture (lvd) and eutrustox, clayey (lvef) and compacted in layers of 0.03m in pots of 0.20m height and 0.25m diameter (0.00982m3). the values of resistance to penetration were measured by dinamometric ring penetrometer. the experiment was complete randomized, in a 4 x 2 factorial, with 3 replications. for the water content at tension of 0.01mpa, the value of resistance to penetration limit to dry land rice yield was 2.38 and 2.07mpa, respectively, for lvd and lvef. higher rice yield was obtained in smaller value of resistance to penetration in water content at tension of 0.05mpa. the dry land rice was less productive in soil with water content at tension of 0.05mpa.
Compacta??o do solo no desenvolvimento radicular e na produtividade da soja
Beulter, Amauri Nelson;Centurion, José Frederico;
Pesquisa Agropecuária Brasileira , 2004, DOI: 10.1590/S0100-204X2004000600010
Abstract: in compacted soils, changes in the distribution of plant root system occur in depth. the objective of this study was to evaluate the compaction effect in soybean root development and yield in an oxisol. the treatments were 0, 1, 2, 4 and 6 passed of a 11 mg tractor, side, by side, on soil surface. the experimental design was a completely randomized, with four replications. in december, 2002, soybean (glycine max cv. embrapa 48) was sown, and after that, the samples were collected in layers of 0.02-0.05, 0.07-0.10 and 0.15-0.18 m, for physical determinations. in r6 stadium, samples of 0.10 m in line x 0.20 m between lines, in layers of 0.0-0.05, 0.05-0.10, 0.10-0.15 and 0.15-0.20 m were collected. soybean yield was evaluated in plots of 3.6 m2. the increase in compaction increased the root density and the root dry matter in layer of 0.0-0.05 m and caused linear decrease in the most compacted layers of 0.05-0.10 and 0.10-0.15 m. from the decrease of 18% of root density, in resistance to penetration of 0.85 mpa, in the depth of 0.05-0.15 m, there was reduction in soybean yield. soil compaction promoted modifications in the distribution of the soybean root system.
Efeito do conteúdo de água e da compacta??o do solo na produ??o de soja
Beutler, Amauri Nelson;Centurion, José Frederico;
Pesquisa Agropecuária Brasileira , 2003, DOI: 10.1590/S0100-204X2003000700009
Abstract: soil compaction has been limiting physical factor to plants growth. this work aimed to evaluate the production of soybean (glycine max cv. embrapa 48) as affected by water content and soil compaction. the experimental design was completely randomized, in a factorial scheme 4x2, i.e., four levels of resistance to penetration (between 0.27 and 4.32 mpa) and two levels of soil water retention (0.05 and 0.01 mpa). samples of red latossol medium texture and red latossol clayey were collected in 020 cm depth, sieved in mesh of 0.4 cm and compacted in layers of 3 cm in pots of 20 cm height and 25 cm of diameter (9.82 l). the levels of resistance to penetration were determined with dynamometric ring penetrometer. the critical level of soil resistance to penetration, in relation to grains production, was 1.66 and 2.22 mpa, in red latossol medium texture, and 3.05 and 2.81 mpa, in red latossol clayey, for the water content in tension of 0.05 and 0.01 mpa, respectively. the higher grains production was obtained in tension of 0.01 mpa. soybean production is affected by levels of soil resistance to penetration superior to 2 mpa in latossols under tension of 0.01 mpa.
Altera??es na cor e no grau de flocula??o de um Latossolo Vermelho-Escuro sob cultivo contínuo de cana-de-a?úcar
Prado, Renato de Mello;Centurion, José Frederico;
Pesquisa Agropecuária Brasileira , 2001, DOI: 10.1590/S0100-204X2001000100024
Abstract: the study aimed at assessing the degree of modification of certain physical properties and of the colour of the superficial soil layer of a dark-red latosol of medium texture, subjected to the continuous cultivation of sugar cane during 25 years in jaboticabal, sp, brazil. the treatments consisted of two types of soil use, i.e. absence of cultivation (native vegetation) and intense cultivation with sugar cane, at three depth levels of 0-10, 10-20 and 20-30 cm. the continuous cultivation altered the colour of the level 0-10 cm from 2.5yr2.5/4 (absence of cultivation) to 2.5yr3/4, and impaired the macro structure and lessened the degree of flocculation of the soil's clay.
A planning model for offshore natural gas transmission
Iamashita, Edson K.;Galaxe, Frederico;Arica, José;
Pesquisa Operacional , 2008, DOI: 10.1590/S0101-74382008000100002
Abstract: this paper aims at new approach to solve complex integrated offshore gas planning problems, defining the best transmission strategy for a system with a large number of platforms interconnected between them and with delivery points through a complex gas pipeline network (which can be cycled). the problem is formulated as a large quadratic mixed-integer problem, where non-convexity and non-differentiability is found. because the complexity of the problem, it is proposed a heuristic, in the context of genetic technique, for solving it. several numerical experiments are presented at the end of this work. the results show that the performance of our approach is very good, being its results very close to exact solutions. the algorithm could be used for sizing and optimization designs of gas pipeline networks, as well as for the gas transmission planning of an existing network, seeking for profit maximization.
Soil compaction and fertilization in soybean productivity
Beutler, Amauri Nelson;Centurion, José Frederico;
Scientia Agricola , 2004, DOI: 10.1590/S0103-90162004000600010
Abstract: soil compaction and fertilization affect soybean development. this study evaluated the effects of soil compaction and fertilization on soybean (glycine max cv. embrapa 48) productivity in a typic haplustox under field conditions in jaboticabal, sp, brazil. a completely randomized design with a 5 x 2 factorial layout (compaction vs. fertilization), with four replications in each treatment, was employed. each experimental unit (replicate) consisted of a 3.6 m2 useful area. after the soil was prepared by cultivation, an 11 mg tractor passed over it a variable number of times to create five levels of compaction. treatments were: t0= no compaction, t1= one tractor pass, t2= two, t4= four, and t6= six passes, and no fertilizer and fertilizer to give soybean yields of 2.5 to 2.9 mg ha-1. soil was sampled at depths of 0.02-0.05, 0.07-0.10, and 0.15-0.18 m to determine macro and microporosity, penetration resistance (pr), and bulk density (db). after 120 days growing under these conditions, the plants were analyzed in terms of development (plant height, number of pods, shoot dry matter per plant and weight of 100 seeds) and seed productivity per hectare. soil compaction decreased soybean development and productivity, but this effect was decreased by soil fertilization, showing that such fertilization increased soybean tolerance to soil compaction.
Efeito do conteúdo de água e da compacta o do solo na produ o de soja
Beutler Amauri Nelson,Centurion José Frederico
Pesquisa Agropecuária Brasileira , 2003,
Abstract: A compacta o do solo tem sido fator físico limitante ao crescimento das plantas. Este trabalho objetivou avaliar a produ o de soja (Glycine max cv. EMBRAPA 48) em raz o do conteúdo de água e da compacta o do solo. Usou-se o delineamento inteiramente casualizado, em esquema fatorial 4x2, ou seja, quatro níveis de resistência à penetra o (entre 0,27 e 4,32 MPa) e dois níveis de reten o de água pelo solo (0,05 e 0,01 MPa). Foram utilizadas amostras de Latossolo Vermelho textura média (LVd) e Latossolo Vermelho textura argilosa (LVef), coletadas na profundidade de 020 cm, passadas em peneira de 0,4 cm e compactadas em camadas de 3 cm, em vasos de 20 cm de altura e 25 cm de diametro (9,82 L). Os níveis de resistência à penetra o foram determinados com o penetr metro de anel dinamométrico. O nível crítico de resistência do solo à penetra o, em rela o à produ o de gr os, foi de 1,66 e 2,22 MPa, no LVd, e 3,05 e 2,81 MPa, no LVef, para o conteúdo de água retida na tens o de 0,05 e 0,01 MPa, respectivamente. A maior produ o de gr os foi obtida na tens o de 0,01 MPa. A produ o de gr os de soja é afetada em níveis críticos de resistência do solo à penetra o superiores a 2 MPa em latossolos com conteúdo de água retida na tens o de 0,01 MPa.
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