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Search Results: 1 - 10 of 694666 matches for " S.F.M.;Castilhos "
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Residual feed intake and relationships with performance of Nellore cattle selected for post weaning weight
Lucila Sobrinho, T.;Branco, R.H.;Bonilha, S.F.M.;Castilhos, A.M.;Figueiredo, L.A.;Razook, A.G.;Mercadante, M.E.Z.;
Revista Brasileira de Zootecnia , 2011, DOI: 10.1590/S1516-35982011000400030
Abstract: the objective of this work was to evaluate performance, efficiency parameters and phenotypic correlations among measurements of energy efficiency of nellore cattle selected for post weaning weight and classified according to residual feed intake, calculated by the difference between observed and predicted intake, based on average metabolic body weight and average daily gain. thus, animals were classified within three groups: high (> mean + 0.5 standard deviation, less efficient); medium (±0.5 standard deviation of the mean); and low (< mean - 0.5 standard deviation, more efficient) residual feed intake. no differences were observed at initial and final body weights, average daily gain and dry matter intake among groups. animals with low residual feed intake also had greater feed efficiency, feed conversion and partial efficiency of growth and did not differ from the other animals regarding to relative growth rate and kleiber ratio. residual feed intake was significantly correlated to feed efficiency (-0.25), feed conversion (0.25), partial efficiency of growth (-0.37) and dry matter intake (0.16) but it did not present significant correlation with body weight (0.04), average daily gain (-0.02), relative growth rate (-0.03) and kleiber ratio (-0.05). significant correlations were found between feed conversion and initial body weight (0.34) and average daily gain (-0.46). partial efficiency of growth presented significant correlation with all other efficiency parameters analyzed. residual feed intake has high potential in productive efficiency, when compared to the other energy efficiency measurements, being independent of growth and size of the animals.
Información Bibliográfica
S.F.M., J.F.B, J.I.U., A.J.V.V., A.M.C., M.T.D., A.G.C.
Revista de Metalurgia , 1996,
Abstract:
Linear Absorption Mechanisms in Laser Plasma Interactions
M. Mahdavi,S.F. Ghazizadeh
Journal of Applied Sciences , 2012,
Abstract: In this study, we investigated some effective parameters related to the plasma and the laser characteristics on linear absorption mechanisms such as; plasma scale length, plasma density profile, laser intensity and laser pulse duration. We classify different approaches which lead to different solutions for the wave equation in plasma medium. We showed that, there are some restrictions with applying the linear theory in absorption. Finally we pointed out that there are some restrictions to apply linear theory in absorption. We will see in which regimes collisional or resonance absorption is dominant.
Self Generated Fields Effects of Fast Electrons Beam on Plasma and Beam Characteristics
M. Mahdavi,S.F. Ghazizadeh
Journal of Applied Sciences , 2012,
Abstract: In this study, we investigate the self-generated the electric and magnetic fields effects of fast electrons beam on plasma and beam characteristics. The fields effect as; columbic transverse electric field, radial space charge potential, longitudinal plasma wakefield and transverse self magnetic field on beam propagational characteristics as; a collimated or focused and filamented beam and the plasma density perturbation are investigated. Also the hollowing effect due to self magnetic field which can generate an annular pattern in electrons beam is investigated.
Drainage-Water Quality Variations of Main Drains Discharged into the Zayandehrood and Their Effects on the River Over a One-Year Period
M. Kalbasi,S.F. Mousavi
Journal of Science and Technology of Agriculture and Natural Resources , 2000,
Abstract: Life in central Iran depends on the Zayandehrood river, making the preservation of its quality important. Salinization and pollution of the flow as a result of different organic and inorganic pollutants create serious threats to the environment and to the agricultural activities in the region. Although the role of the main drains discharged into the Zayandehrood in changing its quality is well known, little information is available on the volume and quality of the discharged drains. The purpose of this research was to study the quantity and quality of three main drains (Zoab-Ahan, Rudasht and Segzi) discharging into the Zayandehrood, Monthly samples were taken from each drain and their chemical properties were measured in 1998. The discharge rates were also measured simultaneously at sections near the discharge points. The results showed that all three drains were alkaline and, therefore, had no negative effects on the pH of the river flow. Mean annual EC of Zoab-Ahan, Rudasht and Segzi drains were 5.56, 27.18 and 42.41 dS/m, respectively, and the salt loads discharged into the river by these drains were 39258.4, 37672.9 and 259781.2 ton/year, respectively. Annual mean N concentrations were 4.49, 3.92 and 4.18 mg/L and annual mean P concentrations were 0.26, 0.16 and 0.12 mg/L in the drains, respectively. The most important effect of the drains on the Zayandehrood was salinization, especially in the lower parts of the river. The increase in soluble salt contents of the river after Segzi drain discharge was so high that it made the water thereafter unusable for any purpose.
Monitoramento da composi??o específica da comunidade de macrófitas aquáticas no reservatório Luis Eduardo Magalh?es
Lolis, S.F.;Thomaz, S.M.;
Planta Daninha , 2011, DOI: 10.1590/S0100-83582011000200002
Abstract: this study aimed to evaluate the composition and spatial and temporal distribution of a community of macrophytes in response to abiotic factors in luis eduardo magalh?es reservoir, in the tocantins river. samplings were collected every two months, from march 2005 to january 2006 in five regions of the reservoir. in each region, 15 collection sites were selected. the abiotic variables measured were the secchi disk depth, electrical conductivity, air temperature, and rain and water levels. a standardized sampling effort was applied to assess macrophyte species distribution and community composition. in each site, a distance of 100 m from the shore was covered with a boat maintaining low and constant velocity, for approximately 10 minutes. the submerged species were inventoried with a rake attached to a 4m pipe. incidence data were analyzed using dca. one-way anova was applied to evaluate the effects of the periods and regions on the abiotic and biotic variables. the tukey test a posteriori was applied when significant differences (p<0.05) checar se seria p maiusculo between the variables were found. a total of 50 species was recorded. the most frequent species were salvinia auriculata, oxycaryum cubense and najas microcarpa (submerged). the highest species richness was observed in the riverine regions of the reservoir (areias and tocantins). our results also showed that the spatial variation in community composition was more accentuated than temporal variation.
Relationship Between Value Added and Electricity Consumption in the Iranian Industries
S.F. Ghaderi,M.A. Azadeh,S. Mohammadzadeh
Journal of Applied Sciences , 2006,
Abstract: Energy is a vital resource for economic development in each country; therefore, the determination of relationship between energy consumption and economic growth is one of the factors that decides the supportive energy policies, and is used to optimize allocation of available energy resources. One of the most important segments as economical point and view are industrial sectors. Electricity holds a large percentage of industrial energy consumption, in this study the relationship between value added (economics growth) and electricity consumption was studied. According to the results of casual test, electricity consumption does not add any value to most industries in Iran; hence, supportive policies to increase electricity consumption are inefficient in economic growth.
The Effects of Water Stress and Planting Date on Yield and Yield Components of Pinto Bean (Phaseolus vulgaris)
M. Mahlooji,S.F. Mousavi,M. Karimi
Journal of Science and Technology of Agriculture and Natural Resources , 2000,
Abstract: A study was conducted to determine irrigation scheduling of pinto bean and to evaluate the effect of its planting date. A split-plot with complete randomized block design with four replications was used at Isfahan University of Technology Research Station in Shervedan-Falavarjan, The main plots were three irrigation regimes of T1 to T3 (irrigation after 50±3, 70±3 and 90±3 mm evaporation from class A pan, respectively) and the sub-plots were two planting dates of May 28 and June 28. The results showed that delayed planting from May to June caused earlier flowering, physiological maturity and reduction of 29.6% in grain yield. Grain yield in T1 to T3 treatments were 3585.1, 3510.5 and 1925.8 kg/ha, respectively. The difference between grain yields of T1 and T2 with T3 treatments were significant at 1% probability level. Biological yields at May 28 and June 28 planting dates were 8257.1 and 5535 kg/ha, respectively, which were significantly different. There was no significant difference between biological yields of T1 and T2 treatments. Number of pods per square meter was the most important component of grain yield and 85% of grain yield difference was due to this part. Harvest index was affected by irrigation treatment and planting date. Mean harvest indices for T1 to T3 treatments were 45.5, 46.1 and 37%, respectively, and 42.8% and 44.9% for the two planting dates. Water use efficiencies for grain yield in T1 to T3 treatments were 0.557, 0.556 and 0.329 kg/m3, respectively. Generally, treatment T2 was shown to be the best irrigation regime.
Application of SWAT2000 Model for Estimating Runoff and Sediment in Beheshtabad Watershed, a Sub-basin of Northern Karun
R Rostamian,S.F Mousavi,M Heidarpour,M Afyuni
Journal of Science and Technology of Agriculture and Natural Resources , 2009,
Abstract: Soil erosion is an important economical, social and environmental problem requiring intensive watershed management for its control. In recent years, modeling has become a useful approach for assessing the impact of various erosion-reduction approaches. Due to limited hydrologic data in mountainous watersheds, watershed modeling is, however, subject to large uncertainties. In this study, SWAT2000 was applied to simulate runoff and sediment discharge in Beheshtabad watershed, a sub-basin of Northern Karun catchment in central Iran, with an area of 3860 km2. Model calibration and uncertainty analysis were performed with SUFI-2. Four indices were used to assess the goodness of calibration, viz., P-factor, d-factor, R2 and Nash-Sutcliffe (NS). Runoff data (1996-2004) of six hydrometery stations were used for calibration and validation of this watershed. The results of monthly calibration p-factor, d-factor, R2 and NS values for runoff at the watershed outlet were 0.61, 0.48, 0.85 and 0.75, respectively, and for the validation, these statistics were 0.53, 0.38, 0.85 and 0.57, respectively. The values for calibration of sediment concentration at the watershed outlet were 0.55, 0.41, 0.55 and 0.52, respectively, and for the validation, these statistics were 0.69, 0.29, 0.60 and 0.27, respectively. In general, SWAT simulated runoff much better than sediment. Weak simulation of runoff at some months of the year might be due to under-prediction of snowmelt in this mountainous watershed, model’s assumptions in frozen and saturated soil layers, and lack of sufficient data. Improper simulation of sediment load could be attributed to weak simulation of runoff, insufficient data and periodicity of sediment data.
Antioxidant properties of natural compounds used in popular medicine for gastric ulcers
Repetto, M.G.;Llesuy, S.F.;
Brazilian Journal of Medical and Biological Research , 2002, DOI: 10.1590/S0100-879X2002000500003
Abstract: there is evidence concerning the participation of reactive oxygen species in the etiology and physiopathology of human diseases, such as neurodegenerative disorders, inflammation, viral infections, autoimmune pathologies, and digestive system disorders such as gastrointestinal inflammation and gastric ulcer. the role of these reactive oxygen species in several diseases and the potential antioxidant protective effect of natural compounds on affected tissues are topics of high current interest. to consider a natural compound or a drug as an antioxidant substance it is necessary to investigate its antioxidant properties in vitro and then to evaluate its antioxidant functions in biological systems. in this review article, we shall consider the role of natural antioxidants derived from popular plants to reduce or prevent the oxidative stress in gastric ulcer induced by ethanol.
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