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| Registros recuperados: 151 | |
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| Kleemann, Geisa Karine; UNESP; Barros, Margarida Maria; UNESP; Pezzato, Luiz Edivaldo; UNESP. |
| Determinou-se a composição química dos farelos de algodão 28,0; 38,0 e 46,0% de proteína bruta e os coeficientes de digestibilidade aparente (CDA) pela tilápia do Nilo da matéria seca, proteína, aminoácidos, energia, lipídeo e minerais. Os CDA foram determinados, usando-se dieta-referência purificada, contendo 0,1% do indicador óxido de crômio-III. As rações-teste continham 60,0% da dieta-referência e 40,0% dos alimentos em estudo. Os resultados mostraram diferença (p < 0,05) entre os CDA dos nutrientes dos farelos de algodão. Os CDA dos três farelos de algodão foram: matéria seca = 53,45 a 54,32%; proteína = 71,56 a 74,81%; energia = 53,80 a 58,60%; lipídeo = 85,37 a 89,11%; fósforo = 33,75 a 34,50%; cálcio = 41,21 a 43,75%; ferro = 62,02 a 79,85%;... |
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Palavras-chave: 5 5.04.00.00-2 Zootecnia aminoácidos; Digestibilidade; Energia; Peixe; Minerais; Proteína digestível 5 5.04.00.00-2 Zootecnia amino acids; Digestibility; Energy; Fish; Minerals; Protein availability. |
| Ano: 2009 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/505 |
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| Rezende, Pedro Leonardo de Paula; Universidade Federal de Goiás; Restle, João; Universidade Federal do Tocantins; Padua, João Teodoro; Universidade Federal de Goiás; Fernandes, Juliano José de Resende; Universidade Federal de Goiás; Lino, Fabíola Alves; Universidade Federal de Goiás; Guimarães, Tiago Pereira; Universidade Federal de Goiás. |
| The present study aimed to evaluate the effects of different nutritional strategies in growing and finishing phases on the carcass morphometry of 24 crossbred steers, ½ Holstein/Zebu, slaughtered at 15 months of age and 395.0kg live weight. In the growing phase, animals were maintained grazing on Brachiaria brizantha, receiving two levels of energy supplementation in quantities equivalent to 0.5 or 1.0% live weight. Then, animals were finished in feedlot receiving diets composed of 50 or 80% concentrate. The percentage of primary cuts was not influenced by feed levels in the growing and finish phases. The high supplementation level in the growing phase resulted in a higher (p < 0.05) carcass length (134.48 vs. 131.43 cm). The food levels did not... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 5.04.00.00-2 arm perimeter; Conformation; Carcass length; Cushions thickness; Energy; Supplementation. |
| Ano: 2012 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/17904 |
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| 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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| shahgholi, Gholamhossein; Mesri Gundoshmian, Tarhom; Molaie, Faezeh; Eskandari, Orooj. |
| With regard to the limitation of energy resources, especially non-renewable sources and increasing trend of energy consumption in agriculture, energy management in this sector is important. The purpose of this study was assessing energy productivity, input and output energy, energy efficiency and output-input energy ratio of sugar beet production in west Azerbaijan province of Iran. To achieve these objectives, statistical data about cultivation area, sugar beet yield in 2010 were acquired from the agricultural research center of west Azerbaijan province. Also data about cultivation methods, implements and machinery in use were obtained from sugar beet farmers by questionnaire. According to the results, total energy consumption in sugar beet production was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sugar beet; Energy; Direct energy; Energy ratio. |
| Ano: 2018 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4326 |
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| Sven Nimmermark. |
| In regions with a colder climate the use of heat energy for climatization of greenhouses can be significant. Beside outdoor temperatures and climate also transpiration affects the use of heat energy since heating and ventilation or dehumidification may be required in order to keep the humidity in the greenhouse below levels which may lead to plant diseases. A reliable model is a powerful tool to predict energy use for greenhouse cultivation. Thus, a mechanistic model including transpiration and energy use for dehumidification and hourly output data was developed from an older simpler model. To be reliable, modelled data must fit with real data. The aim of the present study is to compare measured and modelled use of heat energy. Thus, energy use for a... |
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Palavras-chave: Greenhouses; Energy; Measurements; Modelling. |
| Ano: 2015 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3100 |
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| Flores, Edgar Dulay; Dela Cruz, Renita S. M.; Antolin, Ma Cecilia R.. |
| Four corn production systems at farmer-level of operation were evaluated. Environmental performance such as energy use, energy efficiency, greenhouse gas emission (GHG) and carbon efficiency were determined. Data were collected from 60 corn producing farmers using survey questionnaires and face to face interview. The input energy to produce an output energy of 69,714.06 and 73,029.60 MJ/ha for sun drying and mechanical drying, respectively, were 22,346.27, 31, 469.75, 22, 399.05 and 31,522.53 MJ/ha for systems 1 (manual harvesting and sun drying), 2 (manual harvesting and mechanical drying), 3 (mechanical harvesting and sun drying) and 4 (mechanical harvesting and mechanical drying), respectively. The highest energy input was observed for system 4... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agricultural and Bioprocess Engineering; Energy and Environmental Engineering corn; Carbon; Energy; Global warming potential; Greenhouse gases. |
| Ano: 2016 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3568 |
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| Ismail, Nahed Khairy. |
| This study was carried out, at Dept. of Agric. Eng., Faculty of Agric., Mansoura Univ., Egypt during 2014 spring season, to design and evaluate a cutting prototype performance and production as a date palm leaves components (fronds, leaflets and spines). The tested treatments include saw speed (167.5, 251.2, 334.9 and 418.7 rad s-1), saw teeth inner spacing (4, 5 and 8 mm) and feeding speed ratio (1:1, 1:1.25, 1:1.67 and 1:2.50). The study concluded that the optimum operation conditions of saw speed of 334.9 rad s-1, saw teeth inner spacing of 8 mm and 1:1.25 feeding speed ratio achieved cut fronds productivity of 1051.5 m h-1, cut leaflets and spines productivity of 183.86 kg h-1, cutting leaflets efficiency of 99.32%, leaflet losses of 0.68 %, frond... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agricultural Engineering-Bio-system Engineering Date palm leaves; Leaflet; Frond; Efficiency; Circle saw; Losses; Energy. |
| Ano: 2017 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4043 |
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| Jokiniemi, Heikki Tapani. |
| Combine harvesting is one of the most energy consuming field operations in arable farming. The power demand of combine harvester depends strongly on the mass flow through the machine, and one approach to reduce the energy consumption is thus increasing the stubble height in harvesting. In this study, the energy saving possibilities by increased stubble height and different straw management in cereal harvesting were examined. In addition to combine harvesting, the mulching of the tall stubble with a tractor powered rotary mower after the harvest was investigated. The results indicated an energy saving of 22%–24% in combine harvesting of spring wheat “Quarna” when the stubble height was increased from 13 cm to 35 cm, and 17% with 13 cm stubble when the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Combine harvesting; Cereal; Stubble height; Energy; Fuel consumption; Stubble mulching. |
| Ano: 2015 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3360 |
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| Voltr, Vaclav. |
| The article deals with the connection between energy and economic indicators of crop production in the Czech Republic. Herein, a procedure for the determination of energy inputs and outputs from production based on soil-climatic conditions is outlined. For basic arable crops, other possibilities using the production in the energy sector as well as in relation to soil-climatic conditions are evaluated. The article reviews the production and economic parameters of crop production for potential energy use, such as natural production, energy production, electricity and operational profit. The maximum production parameters are achieved by sugar beet and, consequently, maize for silage. Other energy-efficient crops are alfalfa and clover, but with technological... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Energy; Crops; Operating margin; Soil-climatic condition; Maise; Alfalfa. |
| Ano: 2020 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5502 |
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| Kic, Pavel. |
| This paper is focused on the Computational fluid dynamics (CFD) modeling of regenerative heat exchanger suitable for animal houses. Buildings used for housing of animals in farms with intensive breeding, like poultry or pig houses, are characterized by high generation of heat inside, partly produced by animals, and in the case of small young animals, supplemented also by heating. On the other side these buildings need intensive ventilation which causes big losses of energy by exhausted air. A good way how to reduce heat losses can be the use of technical systems of heat recovery. There are two principal constructions of heat exchangers for heat recovery. There are either recuperative or regenerative heat exchangers. Industrially produced heat exchangers,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Animal houses; Ventilation; Energy; Parameters; Czech Republic. |
| Ano: 2015 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3137 |
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| Amiri Chayjan, Reza; Fealekari, Mosayeb. |
| Abstract: Optimization of convective drying process of Persian shallot was investigated using dependent variables of effective moisture diffusivity (Deff), specific energy consumption (SEC), shrinkage and color changes. The central composite design (CCD) was selected for design and optimization of the process. The second-order polynomial models with transformed responses were developed from experimental data to generate three dimensional response surfaces and contour plots. Experiments were performed at air temperatures of 40°C, 55°C and 70°C, air velocities of 0.5, 1.5 and 2.5 m/s and slice thicknesses of 2, 4, and 6 mm in triplicate. Based on response surface and desirability functions, the optimum conditions for Persian shallot drying were: air... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Color; Diffusivity; Energy; Central composite design; Shrinkage. |
| Ano: 2014 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2807 |
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| Mutuli, Gibson Peter; Mbuge, Duncan. |
| Thin layer drying of cowpea leaves (Vigna unguiculata) and jute mallow (Corchurus olitorious L) (African leafy vegetables) was studied at different temperatures (40oC -100oC) in a convective laboratory dryer. The study determined the drying characteristics of the vegetables, the maximum drying temperature and the drying energy requirements. Moisture content of the African leafy vegetables was determined on dry basis and the data were used to calculate moisture ratios and drying curves were plotted. The drying occurred in the falling rate period. The experimental data were fitted to fourteen thin layer drying models and the most appropriate drying model determined using correlation coefficient, mean square error and standard error of estimate. The model... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Africa leafy vegetables; Thin layer drying; Moisture content; Energy; Modeling. |
| Ano: 2015 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3368 |
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| Zitnak, Miroslav. |
| Nowadays, straw is increasingly used in the world, not only within animal production but also as a source of energy. The technology of straw collection by baling into big bales has many advantages, the use of which is, however, restricted by an ineffective handling when transporting from fields. Currently used balers enable collecting of all types of stalky materials. Picked-up mass is cut and pressed in the baler as necessary. Balers are able to increase the baling pressure by more than 25 %. It follows that bales are reaching higher weights, i.e. the specific weight of bales and energy contained in them is increasing, too. Baling and transport of straw bales significantly influences the economic efficiency of heat generation from this product.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Transport efficiency; Straw bales; Energy. |
| Ano: 2015 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3128 |
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| Registros recuperados: 151 | |
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