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A Conservative Model for Nonlinear Dynamics in a Stratified, Rotating Fluid ArchiMer
Filatoff, Nicolas; Carton, Xavier.
We present a set of equations describing the nonlinear dynamics of flows constrained by environmental rotation and stratification (Rossby numbers Ro∈[0.1,0.5] and Burger numbers of order unity). The fluid is assumed incompressible, adiabatic, inviscid and in hydrostatic balance. This set of equations is derived from the Navier Stokes equations (with the above properties), using a Rossby number expansion with second order truncation. The resulting model has the following properties: 1) it can represent motions with moderate Rossby numbers and a Burger number of order unity; 2) it filters inertia-gravity waves by assuming that the divergence of horizontal velocity remains small; 3) it is written in terms of a single function of space and time (pressure,...
Tipo: Text Palavras-chave: Incompressible and Stratified Fluids; Intermediate Model; Rossby Number; Burger Number; Conservation Properties; Energy; Potential Vorticity.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00600/71195/69561.pdf
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A importância da energia para o setor agropecuário: uma abordagem do modelo VECM AgEcon
Alves, Yony Brugnolo; Costa, Gilberto Fernandes Da; Ribeiro, Joao Gabriel; Parre, Jose Luiz; Alves, Alexandre Florindo.
O presente trabalho investigou, com as metodologias de causalidade segundo Granger e VECM, a relação entre o PIB Agropecuário brasileiro e as variáveis consumo de energia do setor, maquinário agrícola, rebanho bovino e produção de grãos no período de 1970 a 2005. O consumo de energia foi enfatizando devido à agropecuária ser produtora e consumidora desta. Os resultados apontam uma grande relação, no curto prazo, entre o PIB e o consumo de energia. Quando se considera o conjunto das variáveis encontrou-se evidência de causalidade segundo Granger, evidenciando a importância das variáveis selecionadas como variáveis explicativas do PIB agropecuário. --------------This study used Granger causality and VECM methodologies, to investigate the relationship between...
Tipo: Conference Paper or Presentation Palavras-chave: Energia; PIB Agropecuário; VECM; Causalidade segundo Granger; Energy; Agricultural GDP; VECM; Granger Causality; Agribusiness; Resource /Energy Economics and Policy.
Ano: 2008 URL: http://purl.umn.edu/108096
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A methodology to assess the impact of agricultural practices in the Water-Energy-Food Nexus. Repositório Alice
TURETTA, A. P. D..
By 2030, it is estimated that the world population will be 8.3 billion people, increasing the pression in energy, water, food, land use and mineral extraction, especially in the developing world. These estimates indicate the immediate need to adopt interventions that can minimize these impacts. There is a lot of talk about sustainability, but it is still rare to make the results of integrated evaluations available on various topics. When considering the integrated Nexus Food-Water-Energy (F-W-E) assessment, this fact is even more challenging. Considering the importance of the agricultural sector in Brazil and the existence of areas in different stages of degradation, it becomes strategic for interventions that can generate socio-economic and environmental...
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Impacto Ambiental; Agricultura; Energia; Água; Uso da Terra; Alimento; Environmental impact; Agriculture; Energy; Water; Land use; Foods.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1114264
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A mezőgazdasági épületek és háztartások energiaköltségének csökkentése fontos a versenyképességben és a megélhetésben AgEcon
Herczeg, Rahel Sara; Suveges, Peter.
A globális hőmérséklet-növekedés környezeti változásokhoz, a tengerszint emelkedéséhez, a csapadék mennyiségének és térbeli eloszlásának megváltozásához, szélsőséges időjárási viszonyokhoz vezet. Állat- és növényfajok kipusztulásának sebessége jelentősen nő. Bizonyos betegségek könnyebben elterjedhetnek. E fel¬sorolt hatásokból látható, hogy a mezőgazdaságot közvetlenül érinti a klímaváltozás. Fontos tehát, hogy a mezőgazdasági üzemek maguk is tegyenek a káros hatások enyhítéséért. Lehetséges megoldás a biomassza tüzelése, amely a mezőgazdasági rendeltetésű épületek és háztartások energiaköltségeit jelentősen mérsékli. Tanulmányunk olyan megoldást dolgoz ki, melyben a hő előállításához szükséges energia költsége teljes mértékben megszűnik, ami energiaerdő...
Tipo: Journal Article Palavras-chave: Energia; Költség; Megtakarítás; Mezőgazdasági üzem; Háztartás; Energy; Costs; Savings; Agricultural plants; Households; Agribusiness; Community/Rural/Urban Development.
Ano: 2009 URL: http://purl.umn.edu/92418
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A Study Evaluation Model and Index System of Industrial Resource and Energy Consumption in Small Towns AgEcon
Tong-sheng, Zhang.
Based on the principles of hierarchy, representativeness, operability and completeness, 10 indices are selected from 3 aspects of resource consumption, energy consumption and environmental emissions during small town development. Comprehensive evaluation index system for industrial source-energy saving and pollution reducing in small towns in constructed. According to the fuzzy mathematical method, qualitative calculation model of two-level hierarchical structure is constructed. Among them, the first-level model focuses on each specific evaluation index. It calculates the membership degree of region to resource-energy and pollution reducing in evaluation index set, and sorts the calculation results. The second-level model focuses on the first-level...
Tipo: Journal Article Palavras-chave: Small towns; Resource; Energy; Energy saving; Pollution reducing; China; Agribusiness.
Ano: 2010 URL: http://purl.umn.edu/93239
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A time-energy analysis of daytime surface activity in degus, Octodon degus RChHN
Kenagy,G.J.; Vásquez,Rodrigo A.; Nespolo,Roberto F.; Bozinovic,Francisco.
We present an analysis of time and energy allocation in a day-active caviomorph rodent, the degu, Octodon degus, in central Chile. We quantified components of surface activity in the field on a daily basis in individual degus near the time of the summer solstice, when conditions of heat and aridity were also at a seasonal extreme, in order to answer the following questions. Does the absolute time available for surface activity limit performance? Does the allocation of time and energy for locomotion place a functionally significant limitation on overall energy balance and performance? Degus spent about 2/3 of their above-ground time foraging; they remained stationary about 88 % of the time, walked around slowly about 10 %, and were running rapidly from one...
Tipo: Journal article Palavras-chave: Time; Energy; Activity; Central Chile.
Ano: 2002 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000100014
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Accuracy of Nonlinear Formulation of Broiler Diets: Maximizing Profits Rev. Bras. Ciênc. Avic.
Gonçalves,CA; de Almeida,MA; Faria-Júnior,MJA; Pinto,MF; Garcia-Neto,M.
Nutritionists need to make commercial decisions about the optimal nutrient content broiler feeds. In order to demonstrate that broiler prices may influence dietary nutrient density, this study developed quadratic feed intake and weight gain equations, according to broiler sex and feeding phase, to be applied in a nonlinear feed formulation model. Four hundred and eighty Cobb broilers were allotted to a completely randomized experimental with six treatments, each with four replicates of 10 birds each, from 1 to 56 days old. Treatments consisted of diets containing 2800, 2900, 3000, 3100, 3200, or 3300 kcal metabolizable energy (ME)/kg and constant nutrient to ME ratio. A nonlinear version of the PPFR feed formulation software (http://www.fmva.unesp.br/ppfr)...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Energy; Excel; Mathematical modeling; Nutrition; Response surface.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2015000200173
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Agricultural practices and ecosystem services provision to ensure the food, water and energy security. Repositório Alice
TURETTA, A. P. D.; FIDALGO, E. C. C.; PRADO, R. B.; MONTEIRO, J. M. G.; PEDREIRA, B. da C. C. G.; SCHULER, A. E.; DUARTE, G. T..
Considering the importance of the agricultural sector in Brazil and the existence of areas in different stages of degradation, it becomes strategic for interventions that can generate socio-economic and environmental benefits and positive impacts to the tripod F-W-E. Thus, the present study is based on the Ribeirão das Lajes dam (RJ), a core area for the water supply of the second largest city in Brazil - Rio de Janeiro. A methodological approach will be developed that will generate an integrated assessment tool to evaluate the impact of agriculture practices and its potentiality to ecosystem services provision in the Nexus F-W-E approach.
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Serviços ecossistêmicos; Multifuncionalidade da agricultura; Água; Alimento; Segurança Alimentar; Energia; Agricultura; Ecosystem services; Water; Food security; Energy; Agriculture.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1114266
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AGRICULTURAL PRICE VOLATILITY UNDER CLIMATE CHANGE: The Impact of Multiple Objectives on Commodity Prices AgEcon
Fuss, Sabine; Havlik, Petr; Szolgayova, Jana; Obersteiner, Michael; Schmid, Erwin.
Agricultural price volatility has moved to the forefront of research efforts and political discussion, where much work is already being undertaken with respect to the impact of fluctuations in input prices (e.g. fertilizer, feed and energy). In this paper we also want to take into account the impact of climate change on prices via increased volatility in crop yields. In addition, we analyze the impact of having multiple objectives competing for the land on which crops are grown. In particular, we want to address the concerns that have been voiced about biofuel targets and calls for prioritization of food security.
Tipo: Presentation Palavras-chave: Energy; Food security; Food price volatility; Optimization under uncertainty; Risk and Uncertainty; Q12; Q18; Q28; C61; D81.
Ano: 2012 URL: http://purl.umn.edu/122539
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ALTERNATIVAS PARA A GERAÇÃO DE ENERGIA RENOVÁVEL NO BRASIL: A OPÇÃO PELA BIOMASSA AgEcon
Marconato, Mariane Silva; Santini, Giuliana Aparecida.
Durante muito tempo, os recursos fósseis e hídricos foram os grandes propulsores da civilização e da economia. O Brasil também se apoiou nessas fontes energéticas para o desenvolvimento de atividades industriais, agrícolas, de serviços e da própria sociedade. Entretanto, vive-se hoje uma crise no abastecimento energético, em função da problemática geopolítica, econômica e ambiental em torno da extração e comercialização desses recursos, uma vez que possuem ainda, caráter não renovável, portanto, finito na natureza. Os escassos investimentos governamentais e a abertura econômica do setor energético resultou no fim do monopólio energético, o que favoreceu a implantação de sistemas alternativos, na maioria, advindos da biomassa. Dentre esses, destaca-se a...
Tipo: Conference Paper or Presentation Palavras-chave: Energia; Fóssil; Hídrico; Renovável; Biomassa; Energy; Fossil; Water; Renewable; Biomass; Resource /Energy Economics and Policy.
Ano: 2008 URL: http://purl.umn.edu/112629
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An Analysis of the Link between Ethanol, Energy, and Crop Markets AgEcon
Tokgoz, Simla; Elobeid, Amani E..
Replaced with revised version of paper 12/06/06.
Tipo: Working or Discussion Paper Palavras-chave: Agricultural markets; Energy; Ethanol; Renewable fuels; Crop Production/Industries; Resource /Energy Economics and Policy.
Ano: 2006 URL: http://purl.umn.edu/18453
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Análise dinâmica de sistemas de colheita e manuseio de biomassa para utilização como fonte de energia. Repositório Alice
MANTOVANI, B.H.M.; PEART, R.M.; GIBSON, H..
1983
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Simulacao; Modelos matematicos; Colheita; Sistema; Biomassa; Energia; Palhada; Milho; Cavacos; Madeira; Etanol; Producao; Energy; Corn; Residue; Wood chips; Ethanol; Production; Simulation; Harvest; Biomass.
Ano: 1983 URL: http://www.alice.cnptia.embrapa.br/handle/doc/478747
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Anatomia e dendrometria de Mimosa artemisiana e Eucalyptus grandis. Repositório Alice
PAULA, J.E. de.
A madeira torna-se mais pesada a medida que a arvore envelhece, pois a densidade basica da parte mais interna do tronco, que foi formada quando a arvore era mais nova, e mais baixa, quando comparada com a densidade de parte mais externa. Com este trabalho pretendeu-se conferir a densidade e verificar se a madeira apresentava diferencas anatomica com o aumento da idade, bem como gerar conhecimento biotecnologico seguro que sirva de subsidio ao melhor aproveitamento da madeira, especialmente no que concerne a geracao de energia. O estudo baseou-se em quatro areas da secao circular do tronco, obtidas na altura do DAP (a 1,30 m do solo), orientandas do centro para o alburno. As arvores estudadas tinham 24 anos de idade. A densidade basica de Mimosa artemisiana...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Madeira; Arvore; Tronco; Idade; Biotecnologia; Energia; Wood; Tree; Stem; Age; Biotechnology; Energy.
Ano: 1995 URL: http://www.alice.cnptia.embrapa.br/handle/doc/104237
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Apparent metabolizable energy from microalgae spirulina maxima for broiler chickens. Repositório Alice
TAVERNARI, F. de C.; ROZA, L.; SUREK, D.; SILVA, M. L. B. da.
2016
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Energy; Brollers; Microalgae; Spirulina maxima.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1045619
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Application of n-dodecane as an oxygen vector to enhance the activity of fumarase in recombinant Escherichia coli: role of intracellular microenvironment BJM
Zhang,Sen; Song,Ping; Li,Shuang.
Abstract The effect of the intracellular microenvironment in the presence of an oxygen vector during expression of a fusion protein in Escherichia coli was studied. Three organic solutions at different concentration were chosen as oxygen vectors for fumarase expression. The addition of n-dodecane did not induce a significant change in the expression of fumarase, while the activity of fumarase increased significantly to 124% at 2.5% n-dodecane added after 9 h induction. The concentration of ATP increased sharply during the first 6 h of induction, to a value 7600% higher than that in the absence of an oxygen-vector. NAD/NADH and NADP/NADPH ratios were positively correlated with fumarase activity. n-Dodecane can be used to increase the concentration of ATP...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Oxygen vector; Energy; Fusion protein; Expression; Redox metabolism.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822018000300662
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Application of PFC3D to simulate a planetary ball mill CIGR Journal
Chen, Ying; Guzman, Leno; Potter, Simon; Khan, Majibur.
Planetary ball mill is a versatile machine which has been used for grinding different types of materials for size reduction and lately for hemp decortication. PFC3D, software employing the discrete element method (DEM), was used to simulate the power and energy requirement of grinding hemp for fibre using a planetary ball mill. The simulation was facilitated through a series of hemp grinding tests using the planetary ball mill to examine the power draw of the mill. The test results identified that grinding speed had a significant effect on the power draw of the mill. The power draw data were used to calibrate the discrete element parameters for different grinding speeds. Using the calibrated parameters, one was able to predict the kinetic energy and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Agricultural machinery; Bioprocessing PFC3D; Discrete element model (DEM); Hemp; Planetary ball mill; Power; Energy; Kinetic; Friction.
Ano: 2015 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2986
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Avaliação da viabilidade técnica e econômica da utilização de biomassas como fonte energética alternativa em fornos industriais AgEcon
Lima, Lilian Maluf de; Oliveira, Ana Maria Kefalas; Carletti, Paulo de Tarso Filho; Ferrari, Renata Cristina; Caixeta, Jose Vicente Filho.
This study, conducted along the year 2003, was held in the environment of a cement company plant located in the São Paulo State. That industry has used carbon black as predominant energetic source which besides resulting a huge emission of gases (CO and CO2) into the atmosphere, has been more expensive than some other alternatives of biomass sources. Taking into consideration the location of that plant, there was a large supply of available biomass to be used as alternative fuel for industrial ovens. Several biomasses were analyzed and it was concluded that the sugar cane bagasse and residues of wood (sawdust and woodchips) were the most appropriate alternatives to such an industry.
Tipo: Journal Article Palavras-chave: Biomass; Energy; Transport; Optimization; Resource /Energy Economics and Policy.
Ano: 2006 URL: http://purl.umn.edu/55310
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Balanço de energia em amendoim irrigado. Repositório Alice
CARDOZO, N. P.; VOLPE, C. A.; CUNHA, A. R. da; MARIN, F. R..
O presente estudo utilizou o método do balanço de energia através da razão de Bowen para estimar os fluxos de calor latente (LE) e sensível (H) a partir de medidas do saldo de radiação (Rn), fluxo do calor do solo (G) e gradientes psicométricos (com termopares) em dois cultivares amendoim (Arachis hypogaea L.) irrigado. Os resultados indicam que a partição de Rn em fluxos de LE, H e G varia durante o ciclo, principalmente em função do desenvolvimento vegetativo da cultura. O método da razão de Bowen propiciou medidas de consumo hídrico coerentes com a cultura do amendoim (valores médios de 6 mm.dia-1 para ambos os cultivares).
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Energia; Razão de Bowen; Amendoim; Arachis hypogeae L.; Energy.
Ano: 2009 URL: http://www.alice.cnptia.embrapa.br/handle/doc/513483
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Balanco de energia na cultura da videira (Vitis vinifera L.) irrigada por microaspersao. Repositório Alice
TEIXEIRA, A. H. de C.; AZEVEDO, P. V. de; SILVA, B. B. da; SOARES, J. M..
Durante o ano de 1994, um experimento foi conduzido em Petrolina,PE, Brasil latitude 09o09' S, longitute 40o24' W, altitude 365,5 m. Os componentes do balanco de energia foram avaliados na cultura da videira, com dois anos de idade, variedade Italia, conduzida sob um sistema de latada, 4 m x 2 m. A media de todas proporcoes diarias da radiacao solar global para o saldo de radiacao, nos dias irrigados foi 3% maior que para os dias nao irrigados. A media de todas porcoes diarias do saldo de radiacao transformadas em fluxo de calor latente de evaporacao para os dias irrigados foi 7% maior que para os dias nao irrigados, enquanto que a media de todas as porcoes diarias transformadas em fluxo de calor sensivel e fluxo de calor no solo para os dias irrigados...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Microaspersor; Balanco; Variacao; Grape; Balance; Variation; Clima; Energia; Irrigação; Uva Itália; Vitis Vinifera; Climate; Energy; Sprinkler irrigation.
Ano: 1996 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/133581
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Batch anaerobic digestion of banana waste - energy potential and modelling of methane production kinetics CIGR Journal
Khan, Muhammad Tahir; Brulé, Mathieu; Maurer, Claudia; Argyropoulos, Dimitrios; Müller, Joachim; Oechsner, Hans.
Different fractions of banana (stalk, peel, and flesh) as well as the whole unpeeled banana were studied in a laboratory Biochemical Methane Potential (BMP) assay. After completion of 35-day digestion at 37°C in 2L-reactors, specific methane yields reached 0.256, 0.322, 0.367 and 0.349 m³/kg VS (volatile solids) for stalk, peel, flesh, and unpeeled banana respectively. Considering the country of Uganda, East Africa, the collection of peels and stalks from banana production would yield a theoretical potential of about 60 GWh of electrical energy per year in biogas plants. In order to verify the suitability of banana fractions to the biogas process, their chemical composition was analyzed, and their methane production kinetics was estimated with exponential...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Energy biogas; Anaerobic digestion; BMP assay; Model; Energy; Methane; Waste.
Ano: 2016 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3244
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