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Search Results: 1 - 10 of 37602 matches for " Douglas dos Santos;Chizzotti "
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A meta-analysis of dry matter intake in Nellore and Zebu-crosses cattle
Azevêdo, José Augusto Gomes;Valadares Filho, Sebasti?o de Campos;Pina, Douglas dos Santos;Chizzotti, Mario Luiz;Valadares, Rilene Ferreira Diniz;
Revista Brasileira de Zootecnia , 2010, DOI: 10.1590/S1516-35982010000800024
Abstract: the study was carried out to develop and to evaluate new equations to predict dry matter intake (dmi) of nellore and zebu-crosses cattle using meta-analysis procedure. the data used to estimate the parameters were collected from independent performance experiments using growing and fattening nellore and zebu-crosses cattle, and they were compiled from 561 experimental units. before proposing an equation to predict dmi, it was observed that the genetic group was a source of statisticaly significant variation. therefore, equations to predict dry matter intake in the zebu-crosses and nellore cattle were independently developed. the regression equations for zebu-crosses cattle were: dmi = -2.6098 + 0.08844bw0.75 + 4.4672adg - 1.3579adg2 and dmi = -1.0094 + 0.01608bw + 4.4363adg -1.2548adg2. the regression equations for nellore cattle were: dmi = -2.7878 + 0.08789bw0.75 + 5.0487adg - 1.6835adg2 and dmi = -1.3559 + 0.0159bw + 5.6397adg - 1.8494adg2. in order to evaluate fitted equations, it was utilized data from independent experiments published from 2005 to 2008 in the revista brasileira de zootecnia. the equations (dmi) for nellore overpredicted dry matter intake for estimates lower than 7 and higher than 10 kg·d-1. for zebu-crosses cattle, dispersions of 3 kg d-1 were observed when extreme intakes were evaluated, however, when the equation included bw 0.75, the intercept did not differ from zero and the slope did not differ from 1. it is not possible to fit only one equation for preditcting dmi for beef cattle in tropical conditions, because there are differences between zebu and zebu-crosses. fitted equations that include adg and bw 0.75 should be used as an alternative method to predict dry matter intake of zebu-crosses and nellore beef cattle in tropical conditions.
Estima??o da digestibilidade dos carboidratos n?o-fibrosos em bovinos utilizando-se o conceito de entidade nutricional em condi??es brasileiras
Detmann, Edenio;Valadares Filho, Sebasti?o de Campos;Henriques, Lara Toledo;Pina, Douglas dos Santos;Paulino, Mário Fonseca;Valadares, Rilene Ferreira Diniz;Chizzotti, Mário Luiz;Magalh?es, Karla Alves;
Revista Brasileira de Zootecnia , 2006, DOI: 10.1590/S1516-35982006000500030
Abstract: the objective of this study was to estimate the dietary apparent digestible fraction of nonfiber carbohydrates (nfc) using the lucas test concept. the dataset contained a total of 167 observations with 57 originated from two trials conducted with lactating cows and 110 from three experiments with growing and finishing cattle. the dataset was randomly divided in two subsets. the first subset was used to estimate the model parameters while the second for model validation. tests for checking equality of models were conducted using a dummy variable for comparing animal categories. the true digestibility coefficient did not differ between animal categories, and the estimated value was 0.9705. it was observed greater metabolic fecal nfc for lactating cows than for growing and finishing cattle. the metabolic fecal nfc expressed as a percentile of dietary nfc levels (nfc%) did not change in this study. thus, the dietary apparent digestible nfc (nfcad%) can be estimated by the following equations: nfcad% = 0.9507nfc% - 5.72 for lactating cows and nfcad% = 0.9507nfc% - 5.11 for growing and finishing cattle. the model validation procedure indicated that observed and estimated values of nfcad% were not different. it can be concluded that the lucas test yields reliable estimates of nfcad%.
Reparametriza??o do modelo baseado na lei de superfície para predi??o da fra??o digestível da fibra em detergente neutro em condi??es brasileiras
Detmann, Edenio;Valadares Filho, Sebasti?o de Campos;Henriques, Lara Toledo;Pina, Douglas dos Santos;Paulino, Mário Fonseca;Magalh?es, André Luiz Rodrigues;Figueiredo, Darcilene Maria de;Porto, Marlos de Oliveira;Chizzotti, Mário Luiz;
Revista Brasileira de Zootecnia , 2007, DOI: 10.1590/S1516-35982007000100019
Abstract: the objective of this study was to evaluate the estimates of the digestible fraction of neutral detergent fiber (ndf) in cattle using the surface law approach. the prediction model used in this study was similar to that proposed by the nrc (2001). the following model parameters were used: lignin protection factor on cell wall carbohydrates (lpf) and digestibility coefficient of potentially digestible ndf (dcpndf). two estimate sets of these parameters were evaluated. the first set was called weiss model (wm) and the estimates were 0.75 and 0.667 for dcpndf and lpf, respectively. the second set was called corrected model (cm) and the estimate of lpf was 0.85. for the cm the estimates of dcpndf were obtained by meta-analysis of two trials with lactating cows and four trials with growing and finishing cattle (0.67 and 0.835, respectively). models were compared by using two experiments of each animal category. both models predicted similar digestible ndf for lactating cows. the mean prediction errors (mpe) were +1.07 and +1.05 percentile points of digestible ndf for wm and cm, respectively. the mpe was lower in cm (+0.42 percentile points) than in wm (-6.64 percentile points) for growing and finishing cattle. the random fluctuation pattern of the prediction errors was the main limitation of the cm, which might be explained by environmental effects on the interaction between carbohydrates and lignin in the plant cell wall. although the cm resulted in better estimates than the wm, inclusion of biological methods to estimate potentially digestible ndf may improve the prediction accuracy.
Produ??o de proteína microbiana, concentra??o plasmática de uréia e excre??es de uréia em novilhos alimentados com diferentes níveis de uréia ou casca de algod?o
Magalh?es, Karla Alves;Valadares Filho, Sebasti?o de Campos;Valadares, Rilene Ferreira Diniz;Paix?o, M?nica Lopes;Pina, Douglas dos Santos;Paulino, Pedro Veiga Rodrigues;Chizzotti, Mário Luiz;Marcondes, Marcos Inácio;Araújo, Alexandre Magno;Porto, Marlos Oliveira;
Revista Brasileira de Zootecnia , 2005, DOI: 10.1590/S1516-35982005000400038
Abstract: two trials were conducted to study the effects of different levels of urea or cottonseed hulls on yield of microbial protein, estimated by the urinary excretion of purine derivatives, concentration of plasma urea, and excretion of urea in steers. in the first trial, 24 crossbred castrated steers averaging 300 kg of initial live weight (lw) were uniformly assigned to four treatments in a complete randomized design as follows: 0, 0.65, 1.30, or 1.95% of urea (% of dry matter) that replaced soybean meal in the diet. in the second study, 16 crossbred steers averaging 230 kg of initial lw were uniformly assigned to four treatments in a complete randomized design as follows: 0, 10, 20, or 30% of cottonseed hulls (% of dry matter) that replaced elephant grass silage in the diet. spot urine samples were obtained and the concentration of purine derivatives (allantoin plus uric acid) determined. concentrations of creatinine and urea were analyzed in both blood plasma and urine. no significant differences in the urinary concentration of purine derivatives and in the estimation of microbial protein yield were observed by feeding different levels of urea or cottonseed hulls to steers. similarly, no significant differences in the concentration of plasma urea and in the urinary excretion of urea were found by increasing the proportions of urea in the diet. however, concentration of plasma urea decreased linearly by replacing elephantgrass silage with cottonseed hulls in the second trial. it can be concluded that urea as well as cottonseed hulls can be included up to 1.95 and 30% of the diet dry matter, respectively, with no significant change in the efficiency of microbial protein synthesis.
Igor dos Santos Fischer,Romualdo Douglas Colauto
Revista Universo Contábil , 2009,
Abstract: A company that transfers products among units of the same business group uses Transfer Price to make these operations. When a unit of the business group is located in a foreign country, the prices usually are agreed upon foreign currency and, thus, are vulnerable to oscillations in the exchange rate. In 2005, the Brazilian national currency had a significant appraisal compared to Dollar and Euro. As a consequence, the exportation revenues of companies with branches in foreign countries that use Transfer Price were affected by the behavior of the Brazilians exchange rate. Thus, this research objective is to show the impact of the appraisal of Real in the accounting result comparing to Dollar and Euro on an automotive industry that uses Transfer Price to measure its exportations' revenues. Therefore, an exploratory study with logical deductive approach was performed through a case study focused on FIAT Automoveis S/A. The company's empirical analyzed data were extracted from published accounting statements, from the enterprise's records and from non structured interviews with the Brazilian branch's controlling sector. The result shows that the appraisal of Brazilian's currency wasn't favorable to the company's accounting results, reducing its sales gross revenues and, consequently, its profits. As companhias que transferem produtos entre unidades do mesmo grupo empresarial utilizam-se do Pre o de Transferência para operacionalizar tais transa es. Quando uma unidade do grupo empresarial está situada no exterior, os pre os s o, na maioria das vezes, acordados em moedas estrangeiras e, por isso, est o vulneráveis às oscila es das taxas cambiais. No ano de 2005, a moeda nacional brasileira apresentou valoriza o significativa comparada ao Dólar e ao Euro. Conseqüentemente, as receitas de exporta o de companhias com subsidiárias no mercado externo que utilizam Pre o de Transferência foram impactadas pelo comportamento do cambio do Brasil. Assim, o objetivo do trabalho é mostrar o impacto da valoriza o do Real no resultado contábil do período comparado ao Dólar e ao Euro em uma empresa automobilística que utiliza o Pre o de Transferência para mensura o das receitas de exporta o. Para tanto, realizou-se um estudo exploratório com abordagem lógica dedutiva, por meio de um estudo de caso centrado na Fiat Automóveis S/A. Os dados empíricos referentes à empresa pesquisada foram extraídos das demonstra es contábeis publicadas, dos registros existentes na organiza o e de entrevistas n o estruturadas no setor de controladoria da subsidiária brasileira. Os resul
Intake and total apparent digestibility in lambs fed six maize varieties in the Brazilian Semiarid
Santos, Rafael Dantas dos;Pereira, Luiz Gustavo Ribeiro;Neves, André Luis Alves;Araújo, Gherman Garcia Leal de;Arag?o, Alex Santos Lustosa de;Chizzotti, Mário Luiz;
Revista Brasileira de Zootecnia , 2011, DOI: 10.1590/S1516-35982011001200040
Abstract: the objective of this study was to evaluate the daily intake and total apparent digestibility of dry matter, organic matter, crude protein, gross energy, ether extract, neutral detergent fiber, acid detergent fiber, total and non-fibrous carbohydrates, total digestible nutrients, energy intake and nitrogen balance of silages of six maize varieties with early or super early cycles recommended to northeast brazil. twenty-four male castrated lambs were lodged in metabolic cages. a completely randomized design with six treatments and four replications was used, with means compared by tukey test at 5%. there were no differences among varieties for any of the evaluated variables regarding intake and apparent digestibility. concerning the intake of digestible energy, metabolizable energy and the ratio content of digestible and metabolizable energy, significant differences were observed between varieties and brs assum preto showed highest values of metabolizable energy (2.650,8 kcal/day). all of the treatments presented positive nitrogen balance and did not differ among themselves. the varieties asessed can be an additional option to the semiarid regions in brazil.
Bond Strength of Brackets Bonded with Chemically and Light Activated Materials after Thermal Cycling  [PDF]
Rafael Menezes-Silva, Leonardo Amaral dos Reis, Bhenya Otonni Tostes, Dhelfeson Willyan Douglas de Oliveira, Maria Helena Santos
Advances in Materials Physics and Chemistry (AMPC) , 2015, DOI: 10.4236/ampc.2015.59035
Abstract: The aim of this study was to evaluate the bond strength of orthodontic brackets bonded to tooth enamel with different polymer composites after simulated clinical aging, and analyze the enamel/ bond system fracture interface. 80 human premolars, were randomly divided into five groups (n = 16). G1: CO (Concise Ortodontica—3M ESPE), G2: SB (SuperBond—Ortho Source), G3: FMO (Fill Magic OrtodonticoVigodent), G4: TXT (Transbond XT—3M ESPE) and G5: TP (Transbond Plus Self Etching Primer + Transbond Plus Color Change—3M ESPE). In all groups, the metal orthodontic bracket was bonded to the tooth enamel surface. The specimens were submitted to 3000 thermal cycling baths for 30 s, at temperatures of 5°C, 37°C and 55°C (±1°C). Afterwards they were subjected to shear testing and the results were analyzed by the Student’s-t test (p < 0.05). G1 presented the highest bond strength value, followed by G4 > G5 > G2 > G3. In all groups the majority of the fractures at the interface of the specimens were cohesive, except in G3, which presented the largest number of adhesive fractures. After clinical aging, the chemically activated material (CO) showed higher bond strength than the light activated types (FMO, TXT and TP). The self-etching adhesive system (TP) showed similar bond strength to that of conventional systems (FMO and TXT).
Volatility Estimation and Forecasting During Crisis Periods: A Study Comparing GARCH Models with Semiparametric Additive Models
Douglas Gomes dos Santos,Flávio Augusto Ziegelmann
Revista Brasileira de Finan?as , 2012,
Abstract: In this paper, we compare semiparametric additive models with GARCH models in terms of their capability to estimate and forecast volatility during crisis periods. Our Monte Carlo studies indicate a better performance for GARCH models when their functional forms do not differ from that of the specified Data Generating Process (DGP). However, if they differ from the DGP, the results suggest the superiority of additive models. Additionally, we perform an empirical application in three selected periods of high volatility of IBOVESPA returns series, in which both families of models obtain similar results.
Magnetic Properties of the Metamagnet Ising Model in a three-dimensional Lattice in a Random and Uniform Field
J. B. dos Santos-Filho,Douglas F. de Albuquerque
Physics , 2010, DOI: 10.1088/1742-6596/249/1/012039
Abstract: By employing the Monte Carlo technique we study the behavior of Metamagnet Ising Model in a random field. The phase diagram is obtained by using the algorithm of Glaubr in a cubic lattice of linear size $L$ with values ranging from 16 to 42 and with periodic boundary conditions.
Diogo Henrique Constantino Coledam,Douglas dos Santos,Júlio Wilson dos-Santos
Brazilian Journal of Biomotricity , 2010,
Abstract: COLEDAM, D. H. C.; SANTOS, D.; DOS-SANTOS, J. W. Change on vertical jump after competitive period in professionals soccer players. Brazilian Journal of Biomotricity, v. 4, n. 2, p. 140-147, 2010. Soccer is a sport that demands different intensities of run, with decisive actions of a match being held in maximum intensity. Vertical jump test is widely used in soccer players due to the strong relationship with speed and agility. Futhermore, there are little information about change on vertical jump after the competitive season in soccer players. The aim of this study was to analyze change on vertical jump after the competitive season in professional soccer players. Took part in this study 21 male athletes (20.82 ± 3.16 years, 72.28 ± 8.74 kg and 179.91 ± 6.14 cm) subscribers to the 4th division of the Paulista championship of 2009. The competitive season had a duration of 20 weeks, with a total of 20 official matchs done. The test used was the counter-movement vertical jump (VJ), that was performed in the first (PRE) and last (POS) training session of the competitive period. After confirmation of data normality by Kolmogorov-Smirnov, the inferential analysis of the results of VJ between PRE and POS was performed using the paired t-test, considering the significance level of 5%. There was a significant increase (p<0,05) on VJ after the competitive period (PRE=54,19±4,46 and POS=57,94±5,23). According to the results of this study, it is possible to increase the performance of VJ in professional soccer players after the competitive period of 20 weeks duration.
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