Resultados de búsqueda - "mathematics"

Sensitivity analysis in periodic matrix models: A postscript to Caswell and Trevisan por Lesnoff, Matthieu, Ezanno, P., Caswell, H.

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Genomic prediction for broad and specific adaptation in sorghum accommodating differential variances of SNP effects por Velazco, Julio Gabriel, Jordan, David R., Hunt, Colleen H., Mace, Emma S., van Eeuwijk, Fred A.

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Investigating the epidemiology of heartwater (Cowdria ruminantium infection) by means of a transmission dynamics model por O'Callaghan, C.J., Medley, G.F., Peter, T.F., Perry, Brian D.

“…A mathematical model of the transmission dynamics of Cowdria ruminantium by the ixodid tick Amblyomma hebraeum in the bovine host is developed and used to investigate the epidemiology of heartwater across a range of vector challenge. …”
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An Overview of Dairy Cattle Models for Predicting Milk Production: Their Evolution, Evaluation, and Application for the Agricultural Model Intercomparison and Improvement Project (... por Tedeschi, L.O., Herrero, Mario, Thornton, Philip K.

“…Improving the predictability of milk production by mathematical nutrition models is a prerequisite to further development of systems that can effectively and correctly estimate the contribution of ruminants to GHG emissions and their true share of the global warming event…”
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Farm-level bio-economic modeling of water and nitrogen use: calibrating yield response functions with limited data por Humblot, Pierre, Jayet, P., Petsakos, Athanasios

“…In this respect, farm level mathematical programming bio-economic models can provide valuable insights for examining current and future pressures on resource use. …”
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Genetic diversity in wild relatives of cowpea (Vigna unguiculata) as revealed by simple sequence repeats (SSR) markers por Ogunkanmi, L.A., Ogundipe, O.T., Ng, N.Q., Fatokun, C.A.

“…A dendrogram constructed using unweighted pair group using mathematical averages (UPGMA) analysis distinguished forty three accessions out of a total of forty eight accessions used for the study implying that a great diversity in wild cowpea. …”
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Evaluation of different chemical preservatives to control Zygosaccharomyces rouxii growth in high sugar culture media por Rojo, María Cecilia, Arroyo Lopez, Francisco Noe, Lerena, María Cecilia, Mercado, Laura Analia, Torres, Adriana Mabel, Combina, Mariana

“…None of the preservatives assayed were able to completely inhibit the Z. rouxii growth. However, the mathematical models obtained in a high sugar culture media showed that especially four preservatives (potassium sorbate, sodium benzoate, dimethyldicarbonate and vanillin) were the best options to control the growth of this microorganism, obtaining a maximum reduction on yeast growth of approximately 40%. …”
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Probabilistic model for the spoilage wine yeast Dekkera bruxellensis as a function of pH, ethanol and free SO2 using time as a dummy variable por Sturm, Maria Elena, Arroyo López, Francisco Noé, Garrido Fernandez, Antonio, Querol, Amparo, Mercado, Laura Analia, Ramírez, María Laura, Combina, Mariana

“…Other combinations of environmental variables can also be determined using the mathematical model depending on the needs of the industry.…”
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Feed strategies in dairy production : economic implications of using by-products in the feed ration por Johansson, Erik, Persson, Kristoffer

“…The study employs an own developed mathematical model in the empirical work to give an example of an optimal behavior. …”

The Idea of Inclusive Growth and Development Policy por Naqvi, Syed Nawab Haider

“…Yet it remains an unfinished agenda of human existence--- equivalent to the mathematical problem of “squaring the circle”. It is, therefore, apt that the success of a set of development policies is judged by reference to the fulfilment or non-fulfilment of this universally valid amorphous objective---it is universally valid because it is a relevant reckoner regardless of state of development of a society. …”
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Cost of managing with less: cutting water subsidies and supplies in Egypt's agriculture por Lofgren, Hans

“…Using a mathematical-programming agricultural-sector model of Egypt, this paper analyzes mechanisms for allocating scarce water and for charging the farmers the Operation and Management (O&M) costs of irrigation and drainage, currently covered by the government. …”
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The cost of managing with less: cutting water subsidies and supplies in Egypt's agriculture por Lofgren, Hans

“…Using a mathematical-programming agricultural-sector model of Egypt, this paper analyzes mechanisms for allocating scarce water and for charging the farmers the Operation and Management (O&M) costs of irrigation and drainage, currently covered by the government. …”
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Climate risk scenarios of orange rust for the sugarcane-producing regions of Argentina and Brazil por Angelotti, Francislene, Morales, Cristina Del Carmen, Hamada, Emília, Bisonard, Eduardo Matias, Gonçalves, Renata Ribeiro do Valle, Rago, Alejandro Mario

“…The conditions of climatic favorability for the occurrence of the disease were established by means mathematical logic criteria of GIS, based on knowledge of the authors, who incorporated the implicit effects of the interaction of the virulent pathogen, susceptible host, and predisposing environmental characteristics. …”
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Understanding potato with the help of genomics por Gálvez, J.H., Tai, H.H., Barkley, N.A., Gardner, K., Ellis, David, Stromvik, M.V.

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Cafetales agroforestales de la República Dominicana por Somarriba, E., Sánchez, R.O., Peñaló, J.P., Peguero, F., Cerda, R.

“…The farmers' expert knowledge allowed the construction of mathematical functions that describe the relationships between yield and age of coffee, avocado, banana, orange and sour orange, as well as indications of the planting densities of these species in new renovated coffee plantations. …”
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Science Under Scarcity: Principles and Practice for Agricultural Research Evaluation and Priority Setting por Alston, Julian M., Norton, George W., Pardey, Philip G.

“…Addressing that knowledge gap, this book reviews, synthesizes, and extends such methods as economic surplus analysis, econometric techniques, mathematical programming procedures, and scoring models. …”
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Estimating income mobility in Colombia using maximum entropy econometrics por Morley, Samuel, Robinson, Sherman, Harris, Rebecca Lee

“…Direct estimation of transition matrices is difficult, since time series panel data are unavailable and limited data on the distribution of income do not suffice to determine the coefficients mathematically, let alone provide enough degrees of freedom for estimation. …”
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Qualification of a plant disease simulation model: performance of the LATEBLIGHT model across a broad range of environments por Andrade-Piedra, Jorge L., Forbes, Gregory A., Shtienberg, Dani, Grünwald, Niklaus J., Chacón, María G., Taipe, Marco V., Hijmans, Robert J., Fry, William E.

“…The concept of model qualification, i.e., discovering the domain over which a validated model may be properly used, was illustrated with LATEBLIGHT, a mathematical model that simulates the effect of weather, host growth and resistance, and fungicide use on asexual development and growth of Phytophthora infestans on potato foliage. …”
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Bio-economic evaluation of dairy farm management scenarios using integrated simulation and multiple-criteria models por Herrero, Mario, Fawcett, R.H., Dent, J.B.

“…A decision-support system based on simulation and mathematical programming techniques has been built to represent pastoral dairy production systems. …”
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Comparison of models for describing the lactation curve of latxa sheep and an analysis of factors affecting milk yield por Ruíz, R., Oregui, L.M., Herrero, Mario

“…A total of 14,699 records from 2711 ewes, collected during three consecutive years (1995 to 1997) by the milk recording program of the Latxa ewe of the Basque Country (Spain), were used. Six mathematical models and three fitting procedures were compared. …”
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