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Dissertations / Theses on the topic 'Agricultural industries Mathematical models'

Author: Grafiati

Published: 10 December 2022

Last updated: 31 July 2025

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1

Guedes, Maria do Carmo Vaz de Miranda. "Mathematical models in capital investment appraisal." Thesis, University of Warwick, 1988. http://wrap.warwick.ac.uk/107492/.

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2

Manning, Charles Roger 1956. "Infiltration parameters for mathematical models of furrow irrigation." Thesis, The University of Arizona, 1993. http://hdl.handle.net/10150/278286.

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The effort to improve furrow irrigation design and management by use of mathematical models is hampered by the difficulty of obtaining infiltration parameters that adequately describe the infiltration process in furrows. This difficulty is related to the effect on infiltration of the variability of wetted width of a furrow with depth. Detailed field measurements of twelve furrow irrigations were used to develop infiltration parameters based on three different assumptions regarding the variation of wetted width with depth. These infiltration parameters were used as input into a mathematical mod

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3

Madramootoo, Chandra Alastair 1954. "An agricultural land drainage simulation model /." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=72017.

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A deterministic computer model was developed to continuously simulate the runoff from surface and subsurface-drained fields in the St. Lawrence lowlands. The model simulates all of the major hydrologic and hydraulic processes occurring both above and below the ground. Input data requirements include hourly rainfall, daily potential evapotranspiration, soil physical properties, field dimensions, open channel geometry and drainage system specifications.<br>Events for the years 1978 to 1982 were simulated, to compare the runoff characteristics between 20 ha, clay loam, surface-drained and subsurf

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4

Perrone, Jim T. "Hydrologic modeling of an agricultural watershed in Quebec using AGNPS." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ29763.pdf.

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5

Patterson, Katherine Liza. "Wealth accounts for agricultural land : a hedonic pricing approach." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape16/PQDD_0007/MQ29762.pdf.

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6

Lloyd, Tim. "Present value models of agricultural land prices in England and Wales." Thesis, University of Nottingham, 1992. http://eprints.nottingham.ac.uk/11753/.

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This study employs recently developed techniques in time series econometrics to estimate linear models of equilibrium price determination in a competitive market for durable assets. Motivating this study is the unstructured approach employed in previous land price research, where the theoretical model of agent behaviour is invariably mis-specified or left undeveloped and the empirical model prone to the problems of spurious regression. The joint issues of theoretical and statistical congruence play important roles here. Specifically, a theoretical model is developed in which market participant

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7

Richard, Paul François. "A computer analysis of the flow of water and nutrients in agricultural soils as affected by subsurface drainage." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/29171.

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A computer model was developed in order to determine the effects of drainage practices on nutrient losses from level agricultural soils. The model performs a daily simulation of the vertical flow of water, nitrogen, phosphorus, and heat, and of the growth of crops. A water flow submodel calculates the depth of the water table based on daily predictions of evaporation, transpiration, flow to drains and ditches, and deep percolation. An original saturated-unsaturated flow algorithm is used to determine moisture infiltration, redistribution, and upward flow in the soil matrix, as well as bypassi

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8

Kaharabata, Samuel K. "Non-disturbing methods of estimating trace gas emissions from agricultural and forest sources." Thesis, McGill University, 1999. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=35903.

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Two approaches, one using an atmospheric diffusion model and the other an atmospheric tracer, were used to predict the source strength of trace gases from observations of the downwind concentration field. Both approaches do not disturb the prevailing environmental and physical conditions nor the existing biogenic processes. An analytical solution to the advection-diffusion equation was used to back-calculate the source strength from the downwind concentration measurements of (i) single and multipoint (4 and 16 points) trace gas (sulphur hexafluoride (SF6) and methane (CH4)) release experiments

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9

Basak, Rishi. "Environmental management systems and the intra-firm risk relationship." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0034/MQ64316.pdf.

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10

Arroyo, Jorge M. "Money and the dispersion of relative prices in the drug and apparel industries." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/28574.

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11

Schmid, Wolfgang. "A farm package for MODFLOW-2000 simulation of irrigation demand and conjunctively managed surface-water and ground-water supply /." Diss., The University of Arizona, 2004. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu_e9791_2004_287_sip1_w.pdf&type=application/pdf.

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12

Maundu, Maingi. "The performance of the Canadian food, beverages and tobacco processing industries : an extension of the profit-cost margin model to a pricing model." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/29576.

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This study was undertaken to achieve three major objectives: 1. to estimate an econometric structure-profitability model for Canadian food, beverages and tobacco processing industries; 2. to estimate a structure-price model of the sector to compare with the profit model; and 3. to make inferences about the performance of the sector, with reference to market power and industry efficiency. The above objectives were accomplished by comparing empirical regression results of the two models by using the following approach. First, the statistical significance of the estimated coefficients was us

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13

Johnson, Terrence G. "A model of nitrate leaching from agricultural systems in the northern neck of Virginia." Diss., Virginia Tech, 1992. http://hdl.handle.net/10919/37887.

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A model (VTCROPS) was developed to simulate the long-term effects of nitrogen (N) leaching to groundwater in the Northern Neck region of Virginia, and ultimately to the Chesapeake Bay. VTCROPS simulates N fate and transport in a soil-plant-atmosphere continuum in a vertical slice between two crop rows, enabling consideration of nonuniform fertilizer placement and root growth patterns. VTCROPS models atmospheric, soil and crop subsystems. Atmospheric conditions (rainfall, temperature, solar radiation) may be directly input by the user or generated using a stochastic climatic generator. The soil

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14

Shen, Yunxiang. "Risk analysis and its application in mining project evaluation." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=64009.

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15

Carpentier, Line Chantal. "Agriculture and the environment : an economic-ecologic input-output model of the Canadian economy." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=55482.

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The current environmental movement calls for a re-evaluation of many economic-ecologic relationships. The objective of this study is to identify industrial sectors and final demands most responsible for particular types of residual discharge and resource use. An economic-ecologic model was constructed for the Canadian economy from the Statistics Canada I-O as modified by Thomassin et al. (1992). This modified version with its 12 agricultural sectors and 16 food processing sectors is best suited for agricultural policy analysis. The model estimates national erosion, pesticide and fertilizer use

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16

Fu, Yan. "Modelling of ducted ventilation system in agricultural structures." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=60519.

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Air distribution ducts are used in the environmental control of livestock and poultry building as well as the conditioning of most agricultural produce.<br>In order to simplify the approach to the design of ventilation ducts, a mathematical equation has been derived to describe the average air velocity of a duct.<br>The primary objective of the research work was to test goodness of fit of an equation describing the average air velocity of perforated ventilation ducts, under balanced as well as unbalanced air distribution: $V = H sb{o}{X over L} + (V sb{L}-H sb{o}) {X sp2 over L sp2}$.<br>This

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17

Banik, Milon Marc. "Performance effects of strategic groups and task environments in food manufacturing industries : augmenting the Bain-Mason paradigm." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=56672.

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The concentration-profits relationship of the Bain-Mason paradigm is tested and an alternative "augmented model" is proposed which includes dimensions of task environments of food industries and industry strategy variables. The environment is characterized in terms of Dess and Beard's (1984) dimensions: munificence, dynamism and complexity.<br>The augmented model was found to be a better descriptor of factors affecting the performance of the food industries than the Bain-Mason model. Profitability was found to be positively related to industrial concentration, and negatively related to munific

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18

Edelstein, Christopher. "Climatic conditions and storm hydrology of a small agricultural watershed." Virtual Press, 2005. http://liblink.bsu.edu/uhtbin/catkey/1314224.

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Climatic conditions (precipitation, evapotranspiration, available soil moisture, and temperature) are important variables when considering cumulative storm streamflow for a watershed. The objective of this study was to determine what climatic conditions, if any, could be used to mathematically model cumulative storm streamflow for an extensively-drained small agricultural watershed in northwest Delaware County, Indiana. A water-level recorder was installed in Killbuck Creek during autumn 2002, spring, summer, and autumn 2003 and 2004. To determine discharge, velocity measurements were collecte

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19

Mok, Pik-yin, and 莫碧賢. "Evolutionary optimisation of production-control systems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B29751020.

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20

Land, Miriam L. "On measuring differential yielding abilities of wheat cultivars over varying environments." Thesis, Kansas State University, 1986. http://hdl.handle.net/2097/9925.

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21

Taillon, Kate. "Modeling surface complexation relationships in forest and agricultural soil." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=82435.

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The adsorption behaviour of trace metals in soil may provide us with a way to more accurately predict and assess the toxicity of metals in the environment. This thesis reports efforts to apply surface complexation modeling to agricultural and forest soil and to relate model parameters to common soil properties. This study considered Ca, Cd, Cu, Pb and Zn but the methods here could be applied to other metals. In Chapter 2, the surface charge and adsorption behaviour of a set of Ap horizons was characterised using back-titration and batch adsorption techniques. With the objective of simpl

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22

Mousavizadeh, Mohammad Hassan. "Integration of a geographic information system and a continuous nonpoint source pollution model to evaluate the hydrologic response of an agricultural watershed." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0015/NQ44524.pdf.

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23

Gollamudi, Apurva. "Hydrological and water quality modeling of agricultural fields in Quebec." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=98710.

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Two tile-drained agricultural fields in the Pike River watershed of Southern Quebec were instrumented in October 2000 to monitor phosphorus and nitrate concentrations in surface runoff and tile drainage. Data collected from these sites were used as the primary input to test a GIS-based hydrological and water quality simulation model (ArcView SWAT2000) at the field scale. Surface runoff, subsurface flow, sediment yield, nitrate loads and phosphorus loads were the principal parameters evaluated by the model. The SWAT model was calibrated using data collected in the year 2002 while 2003 data was

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24

Li, Zhe 1974. "The environmental Kuznets curve reexamined for CO₂ emissions in Canadian manufacturing industries /." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=80319.

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Recent studies of the environmental Kuznets curve raise questions regarding the relationship between environmental indicators and GDP and the fundamental reasons that explain this relationship. In response, this thesis presents one-sector and two-sector models to analyze the alternative causal relationships between an environmental indicator and GDP at different stages of economic development. These models analyze how economic scale, technology, preferences, and economic structure influence the causality and shape of the relationship. These theoretical studies are followed by two empiri

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25

Park, William N. "Analysis of repayment ability for agricultural loans in Virginia using a qualitative choice model." Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/91054.

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Agricultural loans issued to farmers in Virginia from the years 1980-1985 are examined to determine the factors which significantly predict repayment ability. Through a review of literature, extension meetings, conferences and informal conversation with agricultural lenders in the state, a list of financial variables and operation characteristics is compiled and analyzed. Results of the analysis are considered in terms of their immediate and potential assistance to lenders in making loan decisions. Using data from various commercial banks, Production Credit Associations and Farmers Home Admin

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26

Serpa, Fabio Marcelo. "Estimativa de esforços em implementos de preparo de solos e adequação trator- implemento." [s.n.], 1997. http://repositorio.unicamp.br/jspui/handle/REPOSIP/257345.

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Orientador: Paulo S. G. Magalhães<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Agricola<br>Made available in DSpace on 2018-07-22T22:28:40Z (GMT). No. of bitstreams: 1 Serpa_FabioMarcelo_M.pdf: 3262573 bytes, checksum: c7a35a0ab37b487969889f07c0065ea1 (MD5) Previous issue date: 1997<br>Resumo: O objetivo foi desenvolver um aplicativo computacional, capaz de estimar os esforços em implementos agrícolas e avaliar o seu desempenho comparando com resultados de campo de diferentes conjuntos trator-implemento. Estudou-se os modelos para cálculo de esforços

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27

Martello, Charles P. "NATO burden-sharing redefinition for a changing European threat /." Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA242560.

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Thesis (M.S. in Management)--Naval Postgraduate School, December 1990.<br>Thesis Advisor(s): Gates, William. Second Reader: Doyle, Richard. "December 1990." Description based on title screen as viewed on April 2, 2010. DTIC Identifier(s): NATO, Defense Planning, Industrial Production, Economics, Burden Sharing, Defense Industries, Sharing, Costs, Military Forces (Foreign), Military Forces (United States), Military Equipment, Mathematical Models, Military Reserves, Industrial Capacity. Author(s) subject terms: Burden-sharing, NATO. Includes bibliographical references (p. 75-80). Also available

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28

Ghebretsadik, Amanuel Habte. "Farm planning for a typical crop-livestock integrated farm : an application of a mixed integer linear programming model." Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/49965.

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Assignment (MSc) -- University of Stellenbosch, 2004.<br>ENGLISH ABSTRACT: In an integrated crop-livestock production farm, the profitability and sustainability of farm production is dependent on the crop rotation strategy applied. Crop rotations have historically been applied to maintain long-term profitability and sustainabiliry of farming production by exploiting the jointly beneficial interrelationships existing among different crop types and the animal production activity. Monocrop (specifically wheat) growers in the Swartland area of the Western Cape are struggling to maintain lo

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29

Reda, Hussein Murad Ali. "A theory for national industrial development presented in a system dynamics model." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/76481.

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The dissertation presents a system dynamics model for national industrial development in developing economies. A development system is defined by national boundary, components and activities. The system is represented by ten activity sectors grouped into three functional classes: (1) Two driving sectors comprising population and investment capital sectors; (2) Seven industrial sectors: resources, manufacturing, agriculture, physical infrastructure, services, technology, and social infrastructure; and (3) An outlet sector represented by a trade sector. The model's general theory of industrial

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30

Butler, David Geoffrey. "A model of adult moth emergence from overwintering pupae : an application to Heliothis armigera." Thesis, Queensland University of Technology, 2001. https://eprints.qut.edu.au/37096/1/37096_Butler_2001.pdf.

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Heliothis spp. are significant agricultural pests worldwide. Larvae of Heliothis amigera feed on a range of economically important agricultural crops in north eastern Australia, with high value crops such as cotton accounting for much of the economic loss. Winter diapause is a key element in the life cycle of Heliothis spp., allowing populations to survive periods of low temperature and low host availability. Rising spring temperatures initiate diapause termination and normal pupal development resumes so subsequent larval populations can take advantage of spring hosts. The implications for a

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31

Morand, Hugues. "The economic potential of the Quebec cropping sector to sequester carbon in agricultural soils /." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=80335.

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This research simulates the response of the Quebec cropping sector to the introduction of carbon credit revenue which could be made available through the implementation of a greenhouse gas emissions trading and offset system in Canada. Eligible carbon sequestering practices investigated in the simulations include adoption of moderate tillage and no-till as well as the conversion to a permanent cover crop. Monetary demand for greenhouse gas emissions offsets from the cropping sector is endogenized in the objective function of the Canadian Regional Agriculture Model (CRAM) which has been

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32

Granço, Gabriel. "Comércio intra-industrial brasileiro: análise dos determinantes através da equação gravitacional." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/11/11132/tde-28062011-092438/.

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Este trabalho teve por objetivo determinar a influência das características dos países e indústrias no comércio intra-industrial brasileiro de produtos manufaturados, considerando fluxos de quantidades comercializadas ao ano, para o período de 2002 a 2006, através de estimativas de uma equação gravitacional adaptada à análise dessa forma de comércio. As variáveis explicativas são relacionadas ao tamanho de mercado, representado pela proxy LPIBij, diferenças entre as rendas per capita dos países, representadas pela proxy LdPIBpcij, e tarifas aduaneiras aplicadas pelos países importadores, LTari

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33

Johann, André Luiz. "Modelo preditivo fuzzy da mobilização do solo no sistema de plantio direto." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/3/3141/tde-29062016-091351/.

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As culturas do milho e da soja respondem pela maior parte da produção nacional de grãos, predominando o sistema de plantio direto. Para uma semeadura direta de qualidade, o bom aterramento do sulco é indispensável, pois garante um ambiente adequado às sementes. Neste sentido, é importante estimar a mobilização de solo promovida por uma haste sulcadora estreita durante esta operação. O modelo analítico existente visa representar a mobilização do solo no sistema de plantio convencional. Como consequência, há situações em que este não pode se aplicado, como no caso de hastes sulcadoras estreitas

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34

Estep, Judith. "Development of a Technology Transfer Score for Evaluating Research Proposals| Case Study of Demand Response Technologies in the Pacific Northwest." Thesis, Portland State University, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10248715.

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<p> Investment in Research and Development (R&D) is necessary for innovation, allowing an organization to maintain a competitive edge. The U.S. Federal Government invests billions of dollars, primarily in basic research technologies to help fill the pipeline for other organizations to take the technology into commercialization. However, it is not about just investing in innovation, it is about converting that research into application. A cursory review of the research proposal evaluation criteria suggests that there is little to no emphasis placed on the transfer of research results. This

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35

Harper, Sharleen Anne. "Mathematical models for dispersal of aerosol droplets in an agricultural setting : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Mathematics at Massey University, Albany, New Zealand." Massey University, 2008. http://hdl.handle.net/10179/814.

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Agrichemical spray drift is an issue of concern for the orcharding industry. Shelterbelts surrounding orchard blocks can significantly reduce spray drift by intercepting droplets from the airflow. At present, there is little information available with which to predict drift deposits downwind, particularly in the case of a fully-sheltered orchard block. In this thesis, we develop a simple mathematical model for the transport of airborne drifting spray droplets, including the effects of droplet evaporation and interception by a shelterbelt. The object is for the model to capture the major featur

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36

Bramucci, Marcelo. "Determinação e quantificação de fatores de influência sobre a produtividade de "Harvesters" na colheita de madeira." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/11/11150/tde-02052002-083723/.

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Somente o setor de papel e celulose brasileiro teve em 2000 um faturamento de US$ 7,5 bilhões, com o consumo de 14 milhões de m3 de madeira de eucalipto. As operações de colheita e transporte florestal chegam a ser responsáveis por 50% do custo final da madeira posto fábrica. Em diversos sistemas de colheita mecanizada, o "harvester" é a máquina base utilizada na derrubada de árvores e processamento da madeira. Trata-se de um equipamento de custo elevado e de alta tecnologia, justificandose estudos no sentido de possibilitar um planejamento mais preciso das operações e o melhor aproveitamento

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37

Omrane, Fatma. "Human health risk assessment of occupational exposure to trace metallic elements mixtures in metalworking industries in the Sfax metropolis (Tunisia)." Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0097/document.

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Les éléments trace métalliques (ETM) sont des polluants qui sont sources de préoccupations majeures à cause de leurs toxicités et de leurs propriétés cumulatives. Certains d’eux peuvent être cancérogènes. La métropole de Sfax, située au sud de la Tunisie, a été touchée par des rejets et émissions d’ETM depuis des décennies. Plusieurs études ont confirmé que la pollution métallique est principalement d’origine anthropique, liée en particulier aux activités industrielles. Cela présente un risque sur la santé des habitants, particulièrement pour ceux qui sont également exposés par leur métier dan

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38

Turcanu, Catrinel. "Multi-criteria decision aiding model for the evaluation of agricultural countermeasures after an accidental release of radionuclides to the environment." Doctoral thesis, Universite Libre de Bruxelles, 2007. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210642.

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Multi-criteria decision aid has emerged from the operational research field as the answer given to a couple of important questions encountered in complex decisions problems. Firstly, as decision aiding tools, such methods do not replace the decision maker with a mathematical model, but support him to construct his solution by describing and evaluating his options. Secondly, instead of using a unique criterion capturing all aspects of the problem, in the multi-criteria decision aid methods one seeks to build multiple criteria, representing several points of view. <p>This work explores the appli

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39

FARIAS, Lourival Antonio Simões de. "Estudo da viabilidade de agroindustrialização do coco (cocos nucifera L.) em São Gonçalo, Sousa-PB." Universidade Federal de Campina Grande, 2015. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/787.

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Submitted by Deyse Queiroz (deysequeirozz@hotmail.com) on 2018-05-23T14:52:55Z No. of bitstreams: 1 LOURIVAL ANTONIO SIMÕES DE FARIAS - DISSERTAÇÃO PPGSA PROFISSIONAL 2015..pdf: 10079550 bytes, checksum: 58af2a33af68f236c4e05efeb4f7ee04 (MD5)<br>Made available in DSpace on 2018-05-23T14:52:55Z (GMT). No. of bitstreams: 1 LOURIVAL ANTONIO SIMÕES DE FARIAS - DISSERTAÇÃO PPGSA PROFISSIONAL 2015..pdf: 10079550 bytes, checksum: 58af2a33af68f236c4e05efeb4f7ee04 (MD5) Previous issue date: 2015-03<br>O semiárido brasileiro é caracterizado por chuvas irregulares, alta evapotranspiração, elevadas temp

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Kong, Gary S. "Social disclosure by Australian listed mineral mining companies: A stakeholder approach." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 1996. https://ro.ecu.edu.au/theses/971.

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This study examines the incentives of Australian listed mineral mining companies within the stakeholder theoretical framework to disclose socially responsible information in their corporate annual report. The three dimensions of the stakeholder theory were empirically tested to explain the association of a social disclosure model comprising categories of social disclosure for environment, energy, product and services, human resources and community involvement, with nine firm-specific characteristics. The sample of 179 Australian listed mineral mining companies for the financial year ending 199

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41

Franzosi, Lígia de Oliveira. "Modelo de referência para processo de exportação de produtos alimentícios para União Europeia." Universidade Tecnológica Federal do Paraná, 2016. http://repositorio.utfpr.edu.br/jspui/handle/1/2509.

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Muitos estudos ressaltam a importância do crescimento do comércio mundial para incentivo no avanço econômico das nações e como motivador da globalização. A exportação é uma das melhores formas de uma empresa alavancar seu crescimento, sendo que um dos setores que mais se destaca nas exportações é o da agroindústria. Entretanto, as empresas que exportam com mais facilidade são as de grande porte, pois tem suporte e conhecimento dos procedimentos envolvidos. As empresas de pequeno porte apresentam dificuldades em função do alto custo envolvido, da falta de capacitação e domínio dos procedimentos

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Almeida, Paulo Nazareno Alves. "Fontes de crescimento e sistema produtivo da orizicultura no Mato Grosso." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/11/11132/tde-24052004-142414/.

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O presente trabalho tem como objetivo descrever o sistema produtivo e quantificar as fontes de crescimento da orizicultura no Mato Grosso, em competição com a cotonicultura, a milhocultura e a sojicultura, no período de 1980 a 2001. Nota-se grandes avanços tecnológicos empregados na cultura do arroz sob o sistema terras altas, diminuindo a diferença produtiva entre este e o arroz irrigado. Diante destas alterações e da carência de informações no tocante ao cultivo de terras altas, são necessários estudos que demonstrem essas alterações de forma sistematizada. Utilizou-se a metodologia

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Paiva, Yhasmin Gabriel. "Estimativa do índice de área foliar por métodos óticos e sensoriamento remoto para calibrar modelo ecofisiológico em plantios de eucalipto em áreas de relevo ondulado." Universidade Federal de Viçosa, 2009. http://locus.ufv.br/handle/123456789/5282.

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Made available in DSpace on 2015-03-26T13:50:18Z (GMT). No. of bitstreams: 1 texto completo.pdf: 1742312 bytes, checksum: dc42985c8c2356eecb3f0d6b67cfccab (MD5) Previous issue date: 2009-07-24<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>The purpose of this study was to estimate the leaf area index (LAI) in eucalyptus forest plantations, using optical instruments and satellite imagery to evaluate the response to the physical and climatic conditions of the study area, and based on these data, calibrate and simulate yields with an ecophysiological growth model. The study

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Creti, Christian. "Fermentation méthanique et désulfuration de gaz par voie bactérienne : proposition d'un bioréacteur de désulfuration, optimisation des deux opérations du procédé." Paris 6, 1986. http://www.theses.fr/1986PA066309.

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Conception et réalisation d'un pilote de laboratoire de 20 litres, garni de supports bactériens en PVC, en vue de produire du biogaz (avec des teneurs en H2s au moins égales à 0,3%. ) Emploi de déchets agro-alimentaires riches en sulfates. L'automatisation est réalisée en connectant des capteurs et des actionneurs à un ordinateur industriel. Le biogaz produit passe en continu et en ligne dans un bioréacteur de désulfuration en molécules organiques. Proposition d'un modèle intégrant les différentes vitesses de réaction. Perspectives de synthèse de molécules à haute valeur ajoutée.

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Kean, J. M. "Metapopulation theory in practice." Lincoln University, 1999. http://hdl.handle.net/10182/1372.

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A metapopulation is defined as a set of potential local populations among which dispersal may occur. Metapopulation theory has grown rapidly in recent years, but much has focused on the mathematical properties of metapopulations rather than their relevance to real systems. Indeed, barring some notable exceptions, metapopulation theory remains largely untested in the field. This thesis investigates the importance of metapopulation structure in the ‘real world’, firstly by building additional realism into metapopulation models, and secondly through a 3-year field study of a real metapopulation s

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Dissart, Jean-Christophe. "The economics of erosion and sustainable practices : the case of the Saint-Esprit watershed." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0006/MQ44158.pdf.

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Santos, José Altair Ribeiro dos. "Proposta de modelo inteligente de definição de produto para atendimento à diretiva RoHS." Universidade Tecnológica Federal do Paraná, 2015. http://repositorio.utfpr.edu.br/jspui/handle/1/1379.

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As empresas de manufatura necessitam integrar seus processos internos digitalmente para se tornarem mais competitivas e entregarem produtos com maior qualidade ao mercado consumidor. Informações definidas nas primeiras etapas de projeto precisam ser recuperadas em todas as fases do ciclo de vida de um produto. Para alcançar este objetivo são necessários modelos de informação que incorporem inteligência e permitam a representação do mundo real. Por outro lado, fabricantes de produtos eletroeletrônicos precisam cumprir requisitos ambientais presentes em marcos regulatórios, como a Diretiva RoHS,

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Malmgren, Henrik. "Revision of an artificial neural network enabling industrial sorting." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-392690.

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Convolutional artificial neural networks can be applied for image-based object classification to inform automated actions, such as handling of objects on a production line. The present thesis describes theoretical background for creating a classifier and explores the effects of introducing a set of relatively recent techniques to an existing ensemble of classifiers in use for an industrial sorting system.The findings indicate that it's important to use spatial variety dropout regularization for high resolution image inputs, and use an optimizer configuration with good convergence properties. T

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David, Hélène. "Etude de matrices polymères permettant la libération contrôlée d'agents actifs en agriculture : expérimentation et modélisation des transferts de matière." Saint-Etienne, 1989. http://www.theses.fr/1989STET4004.

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L'agent actif considéré a été l'éthoprophos, principe nématicide utilisé en agrochimie, mais dans un premier temps, l'aniline a été utilisé comme agent simulant. Les processus d'absorption et de désorption dans l'eau, ont été modélisés, dans le cas d'un granulé composé d'EVA pur, à l'aide d'une solution analytique de l'équation de Fick. Un modèle mathématique basé sur une méthode numérique a été construit pour décrire les transferts à travers un granulé composé par un noyau et une enveloppe

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O'Mara, Laurence Paul. "Linkages from the farm sector to the Australian macroeconomy : towards a theoretical and empirical analysis." Phd thesis, 1985. http://hdl.handle.net/1885/122769.

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The volatile fortunes of the Australian farm sector in recent years, and particularly the severe drought of 1982-83, has renewed interest, amongst policy makers and policy advisers, in the impact which developments in the farm sector may have on the macroeconomy. However, in the Australian literature, there are few detailed theoretical or empirical analyses of farm/macro linkages. Further, the existing Australian macroeconomic models do not provide a fully suitable framework for undertaking such an analysis. In view of these gaps or inadequacies in the existing literature, the objecti

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