Resultados de búsqueda - "mathematics"

Multi-spectral kernel sorting to reduce aflatoxins and fumonisins in Kenyan maize por Stasiewicz, Matthew, Falade, Titilayo D.O., Mutuma, M., Mutiga, Samuel K., Harvey, Jagger J.W., Fox, Glen P., Pearson, T.C., Muthomi, J.W., Nelson, Rebecca

“…The machine was calibrated by building a mathematical model relating reflectance at nine distinct wavelengths (470–1550 nm) to mycotoxin levels of single kernels collected from small-scale maize traders in open-air markets and from inoculated maize field trials in Eastern Kenya. …”
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Sustainability effects of introducing legumes in traditional cropping systems : an experimental case study in Swedish context por Rönnholm Håkansson, Jakob, Bergsland, Ulrik

“…From the two case farms, a mathematical optimization model is developed from which the indicators are calculated. …”

Root-Induced Solubilization of Phosphate in the Rhizosphere of Lowland Rice por Saleque, M.A., Kirk, G.J.D.

“…Independent, in vitro measurements confirmed that acid addition increased the P concentration in the soil solution and the quantity of P that could be desorbed per gram of soil. A mathematical model of the diffusion of acid away from the roots, acid reaction with the soil in solubilizing P, and the diffusion of P back to the absorbing roots showed that, under the conditions of the root‐plane experiments, solubilization by acidification accounted for at least 80% of the P taken up in both P‐fertilized and unfertilized soil, but that less than 50% of the P solubilized could be taken up by the roots.…”
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Impacts of urbanization on land use change and its incidences on the climate: case of Bingerville City (Ivory Coast, West Africa) por Traore, K. S., Obahoundje, Salomon, Hauhouot, A. C., Diedhiou, A.

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Prediction of the in vitro gas production dynamics of kikuyu grass by near-infrared reflectance spectroscopy using spectrally-structured sample populations por Herrero, Mario, Jessop, N.S., Fawcett, R.H., Murray, I., Dent, J.B.

“…Spectra were transformed with 1st, 2nd or 3rd derivative mathematical treatments. NIRS calibration equations were derived for in vitro gas production, with or without scatter correction for particle size using modified partial least squares. …”
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Predicting the effect of vaccination on the transmission dynamics of heartwater (Cowdria ruminantium infection) por O'Callaghan, C.J., Medley, G.F., Peter, T.F., Mahan, S.M., Perry, Brian D.

“…A mathematical description of the transmission dynamics of the tick-borne infection Cowdria ruminantium in commercial beef enterprises in Zimbabwe was used to consider the potential impact of a candidate vaccine to prevent heartwater. …”
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Area Yield Crop Insurance and Diversification in Ghana: An Agricultural Household Programming Model por Nyamekye I

“…Given increasing climate variability and the risks it poses to rain-fed agriculture, this study uses the Expected Utility Framework to develop two non-separable household mathematical programming and simulation models to examine the relationship between crop-diversification and index-based (area-yield) insurance for a representative agricultural household. …”
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Aprovechamiento de pasturas en primavera por Scheneiter, Jorge Omar, Velazco, Julio Gabriel, Acuña, Mariela Luciana, Lavandera, Javier Eduardo, Pacente, Ezequiel Martin, Mattera, Juan

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Un modelo de descomposición hidrológica de un acuífero con fines de manejo por Rodríguez A., Carlos, Morel Seytoux, Hubert J.

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Potential of light and temperature exploitation for Accelerated Shelf Life Studies (ASLT) for sauces por Elmlund, Emelie

“…This is done by converting the accelerated storage results mathematically to represent normal storage conditions, often using different kinetic models. …”

Agricultural loess soils along a climosequence evidenced different susceptibility to acidification by simulated N-fertilization por Iturri, Laura Antonela, Buschiazzo, Daniel Eduardo

“…From these results, the development and validation of mathematical models were assessed in order to predict the soil buffer capacity and the future pH of the soils. …”
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Non-destructive assessment of chloride in persimmon leaves using a miniature visible near-infrared spectrometer por Visconti, Fernando, De-Paz, José M.

“…Next, both the Cl− and spectral data were analyzed using descriptive statistics, mathematical data transformations, principal components analysis (PCA) and partial least squares regression (PLSR). …”
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Ekonomiska konsekvenser av etanolproduktion i östra Sverige por Flensén, Andreas

“…The analyses assume that all members act jointly with the objective of maximizing joint profits at the farm level as well as at the cooperative firm. A mathematical model is created to calculate the optimal use of arable land. …”
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Profitability and competitiveness of grain handling at farm level por Lundberg, Axel, Magnusson, Ludvig

“…The strategy varies based on the possibility to segregate the quality of crops. The study uses mathematical programming, empirical data from statistics and interviews of knowledgeable people within the sector. …”
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Multicriteria assessment of alternative cropping systems at farm level. A case with maize on family farms of South East Asia por Lairez, Juliette, Jourdain, Damien, López Ridaura, Santiago, Syfongxay, Chanthaly, Affholder, François

“…The farm model was based on mathematical programming maximizing income under constraints related to i) household composition, initial cash and rice stocks and land type, and ii) seasonal balances of cash, labour and food. …”
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High value crop products and rural prosperity: The role of operations research and analytics por Cock, James H, Jimenez, Daniel R

“…Operations Research, which looks at an organization’s operations and uses mathematical or computer models, or other analytical approaches, to find better ways of doing things, overcomes many of the limitations of the traditional research methods. …”
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Epidemiology and control of cattle trypanosomosis in villages under risk of trypanocide resistance in West Africa. por Grace, Delia

“…Three strategies were evaluated for trypanosomosis management: participatory vector control in eight villages, keeping trypanotolerant cattle in 65 villages and rational drug use (RDU); the latter by informing farmers in 46 villages, establishing/evaluating primary health services in 18 villages and training service providers who covered 235 villages. A dynamic mathematical model was developed to elucidate development and reversal of trypanocide resistance. …”
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Using fuzzy logic models to reveal farmers motives to integrate livestock, fish, and crops. por Bosma, R.H.

“…Rural extension services have changed paradigm and shifted to more participatory approaches, whereas in common mathematical models of farming systems, farmers’ motivation is solely represented by ‘utility maximisation’. …”
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Värdet av bin för svensk växtodling por Andersson, Torgil, Jankulovski, Filip

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Tropical forest tree mortality, recruitment and turnover rates: calculation, interpretation and comparison when census intervals vary por Lewis, S.L., Phillips, Oliver L., Sheil, Douglas, Vinceti, B., Baker, T.R., Brown, S., Graham, A.W., Higuchi, N., Hilbert, D.W., Laurance, W.F., Lejoly, J., Malhi, Y., Monteagudo, A., Núñez Vargas, P., Sonke, B., Terborgh, J.W., Martínez, R.V.

“…Mathematical proofs show that rate estimates, for example of mortality and recruitment, will decrease with increasing census interval when obtained from censuses of non-homogeneous populations. …”
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