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| Registros recuperados: 45 | |
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| Araújo, Cláudio Vieira de; UFMT; Resende, Gisele Socorro Amaral; Araújo, Sinome Inoe; Ufra; Rennó, Francisco Palma; USP; Tomazini, Ana Paula Inoe; Unipar-Umuarama; Marques, José Ribamar Felipe; EMBRAPA-AO. |
| Informações de 2.981 lactações referentes às primeiras lactações de vacas da raça Pardo-Suíça, filhas de 151 reprodutores, distribuídas em 62 rebanhos, com parições entre 1980 a 2002, foram utilizadas para se verificar a existência da heterogeneidade de variância entre rebanhos e o seu impacto na classificação de reprodutores. As produções de leite foram utilizadas para se classificar os rebanhos em níveis de alta e baixa produção. Utilizou-se um modelo animal que incluiu os efeitos fixos de rebanho-ano e estação de parto, efeito linear do período de lactação, linear e quadrático da idade da vaca ao parto, como covariáveis, além dos efeitos aleatórios de animal e ambiente temporário. Estimaram-se componentes de variância, considerando-se os rebanhos como... |
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Palavras-chave: 5.04.02.00-5 avaliação genética; Heterogeneidade; Bovinos leiteiros; Parâmetros genéticos genetic evaluation; Heterogeneity; Dairy cattle; Genetic parameters. |
| Ano: 2009 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/5197 |
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| Fuentealba,Claudia; Pedreschi,Romina; Hernández,Ignacia; Saavedra,Jorge. |
| C. Fuentealba, R. Pedreschi, I. Hernández, and J. Saavedra. 2016. A statistical approach for assessing the heterogeneity of Hass avocados subjected to different postharvest abiotic stresses. Cien. Inv. Agr. 43(3):356-365. Hass avocado (Persea americana Mill.) is marketed worldwide. Due to its complex physiology, a wide variability in postharvest ripening can be observed, i.e., heterogeneity in the number of days to reach edible ripeness. There is a need for a simple and objective method for evaluating the efficacy of postharvest treatments in the reduction of this postharvest ripening heterogeneity given the high demand of import countries for consistent quality and product homogeneity. Therefore, the aim of this study was to compare the appropriateness of... |
| Tipo: Journal article |
Palavras-chave: Avocados; Heterogeneity; Multiple comparison; Ripening; Standard deviation. |
| Ano: 2016 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202016000300002 |
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| Peña-Gómez,Francisco T; Bustamante,Ramiro O. |
| In this study, we compared demographic responses of Eschscholzia californica populations located at different altitude, under the basic assumption that altitudinal gradients impose environmental limitation to the spread at the upper edge of the gradient. We detected significant differences among populations either in terms of life history attributes and the finite rate of increase. In general, coastal population expressed higher finite population rates than mountain populations, although these differences were not statistically significant. Mountain populations (Corral Quemado and Farellones) expressed a finite population rate not significant different of 1. These result suggest that at the upper front of invasion the species is in a demographic... |
| Tipo: Journal article |
Palavras-chave: Populations; Invasions; Heterogeneity; Demographic matrix. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000100011 |
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| Benhaim, David; Pean, Samuel; Brisset, Blandine; Leguay, Didier; Begout, Marie-laure; Chatain, Beatrice. |
| This study aims to test the influence of size grading on self-feeding behaviour, social structure (measured by the percentage of triggering acts per individual), growth performances, and blood physiological variables of individually passive integrated transponder (PIT)-tagged sea bass juveniles, using a computerized on-demand feeding system coupled with a PIT tag monitoring device. Three consecutive periods of 27 days each were compared: a first period (P1) before grading (6 tanks of 100 fish; 40.2 +/- 8.9 g) followed by a second period (P2) after grading. The protocol applied aimed to create two groups of fish of similar mean weight but with either a low or a high coefficient of variation of weight (CV(w)) corresponding to an imposed difference in social... |
| Tipo: Text |
Palavras-chave: Feeding behaviour; Self feeder; Triggering activity; Heterogeneity; Growth; Grading. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00057/16858/14340.pdf |
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| Raimonet, Melanie; Ragueneau, Olivier; Andrieux Loyer, Francoise; Philippon, Xavier; Kerouel, Roger; Le Goff, Manon; Memery, Laurent. |
| The high heterogeneity of silica cycling in coastal margins and the lack of silica data (compared to nitrogen and phosphorus) prevent the estimation of global silica retention in estuaries. In this study, the spatial and temporal variability of porewater silicic acid (Si(OH)4) profiles e that integrate benthic transport and reaction processes e was investigated at different spatial (metre, longitudinal and crosssection, intra-estuary) and temporal (tidal, seasonal) scales in two macrotidal estuaries, very close geographically but essentially differing in their shape. Studying the spatial and temporal variability of Si(OH)4 concentrations in porewaters provided evidence for the importance of transport processes, e.g. bio-irrigation, tidal pumping,... |
| Tipo: Text |
Palavras-chave: Heterogeneity; Season; Silicate; Sediment; Land-sea interface; Upscaling. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00124/23529/22370.pdf |
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| Siddiqui, Numair A.; Ramkumar, Mu.; Rahman, Abdul Hadi A.; Mathew, Manoj J.; Santosh, M.; Sum, Chow W.; Menier, David. |
| Advances in photogrammetry have eased the acquisition of high-resolution digital information from outcrops, enabling faster, non-destructive data capturing and improved reservoir modeling. Geocellularmodels for flow dynamics with in the virtual outcrop in siliciclastic deposits at different sets of sandstone facies architecture remain, however, a challenge. Digital maps of bedding, lithological contrast, spatial-temporal variations of bedding and permeability characteristics make it more easy to understand flow tortuosity in a particular architecture. An ability to precisely model these properties can improve reservoir characterization and flow modeling at different scales. Here we demonstrate the construction of realistic 2D sandstone facies based models... |
| Tipo: Text |
Palavras-chave: Siliciclastic sandstone facies; Connectivity; Heterogeneity; Digital outcrop model; Flow dynamics. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00637/74937/76048.pdf |
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| Ule, Aljaz; Goeree, Jacob K.; Riedl, Arno. |
| This paper reports results from a laboratory experiment on network formation among heterogeneous agents. The experimental design extends the Bala-Goyal (2000) model of network formation with decay and two-way flow of benefits by allowing for agents with lower linking costs or higher benefits to others. Furthermore, agents' types may be common knowledge or private information. In all treatments, the (efficient) equilibrium network has a "star" structure. With homogeneous agents, equilibrium predictions fail completely. In contrast, with heterogeneous agents stars frequently occur, often with the high-value or low-cost agent in the center. Stars are not born but rather develop: with a high-value agent, the network's centrality, stability, and efficiency all... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Network Formation; Experiment; Heterogeneity; Private Information; Institutional and Behavioral Economics; C72; C92; D82; D85. |
| Ano: 2007 |
URL: http://purl.umn.edu/9099 |
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| Pennings, Joost M.E.; Garcia, Philip; Irwin, Scott H.. |
| Heterogeneity, i.e., the notion that individuals respond differently to economic stimuli, can have profound consequences for the interpretation of behavior and the formulation of agricultural policy. This paper compares and evaluates three grouping techniques that can be used to account for heterogeneity in financial behavior. Two are well established: company-type grouping and cluster analysis. A third, the generalized mixture regression model, has recently been developed and is worth considering as market participants are grouped such that their response to the determinants of economic behavior is similar. We evaluate the grouping methods in a hedging framework by assessing their ability to reflect relationships consistent with theory. The empirical... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Economic behavior; Heterogeneity; Hedging; Methods; Risk and Uncertainty; A10; B40; C1; D0; G0; L2; Q13. |
| Ano: 2011 |
URL: http://purl.umn.edu/114787 |
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| Dillen, Koen; Demont, Matty; Tollens, Eric. |
| After more than a decade of GM crops, literature reports farmers and consumers can gain significantly from the technology, despite the intellectual property rights assigned to the innovator. In this paper we assess the effect of heterogeneity on this distribution of benefits. A two dimensional framework is created to assess the ex ante benefits of an innovation. Given this setting and the scarce data often available, a parametric modelling approach is taken. The two dimensions of heterogeneity, spatial and temporal, are explicitly modelled as they have a different importance for different technologies. Using this framework we can simulate different corporate pricing strategies and evaluate the benefits generated under changing heterogeneity. The framework... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Heterogeneity; Parametric modelling; Ex ante; Research and Development/Tech Change/Emerging Technologies. |
| Ano: 2008 |
URL: http://purl.umn.edu/43945 |
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| Horne, Paula. |
| Finland has launched a new policy programme to encourage conservation of forest biodiversity, based on economic incentives and voluntarism on the part of non-industrial private forest owners. This study examined the factors that affect the acceptability of biodiversity conservation contracts and the amount of compensation needed in private forests, using the choice experiment method. Data were collected by surveying 3000 Finnish private forest owners. Analysing separately those respondents who were willing to enter into a conservation contract allowed an assessment of the impact of forest owners' heterogeneity on compensation amount. |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Forest owners; Heterogeneity; Compensation; Land Economics/Use; Resource /Energy Economics and Policy. |
| Ano: 2004 |
URL: http://purl.umn.edu/59365 |
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| Registros recuperados: 45 | |
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