Semivariance
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. SPATIAL VARIABILITY OF SOIL APPARENT ELECTRICAL CONDUCTIVITY - EFFECT OF THE NUMBER OF SUBSAMPLES
ABSTRACT Soil apparent electrical conductivity (ECa) sensors have been used to detect spatial variability because they correlate with soil attributes. Studies with soil attributes have shown that the number of subsamples and sampling points influences mapping. However, there are no studies that investigated the influence of sampling or subsampling density on
Eng. Agríc.. Publicado em: 2021-05
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2. SPATIAL AUTOCORRELATION OF PHYSICAL ATTRIBUTES OF AN OXISOL
ABSTRACT Studies that seek to identify a smaller number of soil attributes that represent others can generate less expenditure of time and financial resources for monitoring cultivated areas. Thus, this study aimed to analyze the spatial distribution and spatial autocorrelation of physical attributes of an Oxisol (Latossolo Vermelho Amarelo, Brazilian Soil C
Eng. Agríc.. Publicado em: 2021-04
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3. DELINEATION OF HOMOGENEOUS ZONES BASED ON GEOSTATISTICAL MODELS ROBUST TO OUTLIERS
RESUMO Diversas pesquisas utilizam medidas de condutividade elétrica aparente do solo (CEa) como indicador da variabilidade espacial de atributos físico-químicos existentes no campo de produção. Com base nestas medidas, zonas de manejo (ZM) são delineadas para aperfeiçoamento da gestão agrícola. Entretanto, estas amostras têm apresentado presença
Rev. Caatinga. Publicado em: 18/07/2019
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4. Spatial and temporal country-wide survey of temephos resistance in Brazilian populations of Aedes aegypti
The organophosphate temephos has been the main insecticide used against larvae of the dengue and yellow fever mosquito (Aedes aegypti) in Brazil since the mid-1980s. Reports of resistance date back to 1995; however, no systematic reports of widespread temephos resistance have occurred to date. As resistance investigation is paramount for strategic decision-m
Mem. Inst. Oswaldo Cruz. Publicado em: 29/04/2016
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5. Utilização da técnica de co-krigagem com inclinação máxima e altitude do terreno no delineamento de zonas de manejo: granulometria do solo e disponibilidade hídrica / Using the technique of cokriging with maximum slope of the terrain and altitude in the delineation of management zones: grain size and soil water availability
In Brazil, few studied are related about soil sampling strategies in areas with more than one type soil and various features of the landscape, these strategies are important to map the spatial variability of physical attributes: size fractions, as well as the correlation of these with geomorphologic parameters: altitude and maximum slope of the sampled area
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/04/2012
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6. Variables físicas que explican la variabilidad de suelo aluvial y su comportamiento espacial
The objective of this work was to use the principal component and semivariance analyses to select physical variables that could explain the variability of an alluvial soil, in order to establish the spatial behavior of the chosen variables so that the location of experimental plots could be technically defined to study the abrasiveness effect on the wearing
Pesquisa Agropecuária Brasileira. Publicado em: 2011-12
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7. Proposta de um modelo de planejamento agregado da produção numa usina de açúcar e álcool vinculado à flutuação de preços em mercados à vista e no mercado futuro. / A model of aggregate production planning in a sugar mill and alcohol linked the decisions of prices in future markets and present markets.
The objective of study this dissertation is to develop a model of aggregate production planning to support the decisions of management and board level of sugar and alcohol plants in regard to varieties of cane harvested each week, purchasing cane of nonsugar, the type of transport (own or outsourced) to use each week, the total cane processed per week for ta
Publicado em: 2009
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8. Performance das melhores práticas de governança corporativa no Brasil: um estudo de carteiras
The practice of superior principles corporate governance can increase return and decrease share volatility, increase negotiated volume and liquidity, decreasing exposure to external risks, bringing the cost of capital down and enhancing the firms value. This work has the objective to analyzing if companies that adopt superior corporate governance pract
Publicado em: 2007
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9. Variabilidade Espacial do Desenvolvimento e da Produtividade do Trigo â Triticum aestivum
This work had by objective to study and to model the spatial variability of variables relative at the wheat development cultivated in year 2003 in 22,62 ha pertain at Central Co-operative of Agricultural Research (COODETEC). Went used the cultivates Coodetec 101 (3,52 ha) and Coodetec 103 (18,10 ha). The samples went colected in gride of 50 x 50 m, totalized
Publicado em: 2005
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10. ESTUDO COMPARATIVO DA CAPACIDADE PREDITIVA DE MODELOS DE ESTIMAÇÃO DE VOLATILIDADE / A COMPARATIVE STUDY OF THE FORECAST CAPABILITY OF VOLATILITY MODELS
The risk concept is defined as the distribution of the unexpected results from variations in the values of the variables that describe the market. However, the variable risk is not observable and its measurement depends on which model is used in its evaluation. Thus, the application of different models could result in significant different risk forecasts.The
Publicado em: 2001