SABIIA - Sistema Aberto e Integrado de Informação em Agricultura (Sabiia)

A Conservative Model for Nonlinear Dynamics in a Stratified, Rotating Fluid

GORGATTI NETTO, A..

Tipo: Folhetos

Palavras-chave: Agroindustria; Brasil; Fonte alternativa; Agroindustrial sector; Alternative sources; Energia; Pesquisa; Energy; Research.

Ano: 1980

URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/83423

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

A importância da energia para o setor agropecuário: uma abordagem do modelo VECM

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

A mezőgazdasági épületek és háztartások energiaköltségének csökkentése fontos a versenyképességben és a megélhetésben

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

A Study Evaluation Model and Index System of Industrial Resource and Energy Consumption in Small Towns

A time-energy analysis of daytime surface activity in degus, Octodon degus

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

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

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)...

AGRICULTURAL PRICE VOLATILITY UNDER CLIMATE CHANGE: The Impact of Multiple Objectives on Commodity Prices

Palavras-chave: Energy; Excel; Mathematical modeling; Nutrition; Response surface.

Ano: 2015

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2015000200173

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

ALTERNATIVAS PARA A GERAÇÃO DE ENERGIA RENOVÁVEL NO BRASIL: A OPÇÃO PELA BIOMASSA

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

An Analysis of the Link between Ethanol, Energy, and Crop Markets

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

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...

Application of PFC3D to simulate a planetary ball mill

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

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...

Avaliação da viabilidade técnica e econômica da utilização de biomassas como fonte energética alternativa em fornos industriais

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

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

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...

BIO-ENERGY FROM WINERY BY-PRODUCTS: A NEW MULTIFUNCTIONAL TOOL FOR THE ITALIAN WINE DISTRICTS

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

Begalli, Diego; Codurri, Stefano; Gaeta, Davide.

This paper aims to investigate if the legislation will allow the production of energy from winery by-products and how this can contribute to multifunctionality of the wine makers’ income. A medium size winery was selected and an anaerobic digestor process was simulated using the company’s data. The main methods of financial evaluation were studied to create information to see if the project concepts were valid. The results highlight the positive level of earnings that the project will generate due to the high level of methane included in the pressings that could be transformed in energy, the short period needed for obtaining methane and the recent substantial level of government support both in Green Certificates and financing of the initial cost of the...

Tipo: Conference Paper or Presentation

Palavras-chave: Biomass; Winery by-products; Multifunctionality; Energy; Wine district; Agribusiness; Community/Rural/Urban Development; Resource /Energy Economics and Policy.

Ano: 2009

URL: http://purl.umn.edu/57492

Biogás: independencia energetica do Pantanal Mato-Grossense.

Biogás: na sua fazenda a baixo custo.

COMASTRI FILHO, J. A..

A crise de energia, provocada pelos sucessivos aumentos nos precos do petroleo, fez com que o Governo Brasileiro desse maior atencao a producao de biogas, que nas areas rurais podera rapidamente permitir a auto-suficiencia energetica, devido a existencia de grande quantidade de residuos organicos, para a utilizacao em biodigestores. A regiao do Pantanal Mato-Grossense oferece condicoes excepcionais para um arrojado plano de utilizacao de energia proveniente da fermentacao de biomassa. A utilizacao de energia do biogas, nesta regiao, e muito favorecida em virtude das condicoes climaticas e da abundancia de excrementos bovinos, abrindo uma perspectiva favoravel a sua aplicacao no sentido de se obter energia a custo relativamente baixos, atraves de unidades...

Tipo: Livros

Palavras-chave: Construcao; Instalacao; Methane digesters; Production; Biodigestor; Biogás; Energia; Pantanal; Energy.

Ano: 1981

URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/787706

Biogás: uma alternativa de energia no meio rural.

ALENCAR, J. de.

Tipo: Artigo na mídia

Palavras-chave: Meio rural; Farm; Biogás; Energia; Energy.

Ano: 1981

URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/589871

ALVES, S. de M.; MELO, C. F. M. de; WISNIEWSKI, A..

Tipo: Folhetos

Palavras-chave: Construção; Biodigester; Biofertilizer; Construction; Biofertilizante; Biodigestor; Biogás; Energia; Pesquisa; Energy; Research.

Ano: 1980

URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/378021

Body composition and energy and protein requirements of grazing Nelore steers

R. Bras. Zootec.

Almeida,Vitor Visintin Silva de; Queiroz,Augusto César de; Silva,Fabiano Ferreira da; Silva,Robério Rodrigues; Oliveira,Aline Cardoso; Souza,Danilo Ribeiro de.

This experimentwas carried out with the objective of determining the energy and protein requirements of grazing Nellore steers. Twenty four Nellore steers (average 371 ± 14 kg of BW and 26 months old) were used. Four steers were slaughtered at the beginning of the experiment (reference group), serving as a reference for the subsequent study. The remaining 20 animals were weighed and distributed in a randomized complete block design with four levels of supplementation offers: 0.0 (mineral mixture - control), 0.3, 0.6 and 0.9% BW, with five replications. The supplements, based on ground corn, soybean meal and/or urea, were previously balanced to achieve an average daily gain of 350, 650 and 850g, respectively, for the different levels of supplementation...

Bringing pumps to people: giving the poor better access to groundwater irrigation: sustainable approaches and options for eastern India

Palavras-chave: Energy; Protein; Requirements; Zebu cattle.

Ano: 2009

URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009000700026