Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: 

RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 1.391
Primeira ... 123456789 ... Última
Imagem não selecionada

Imprime registro no formato completo
A Review of Fixed Bed Gasification Systems for Biomass CIGR Journal
Sangeeta Chopra; Anil K Jain.
The gasification of biomass into useful fuel enhances its potential as a renewable energy resource. The fixed bed gasification systems are classified as updraft, Imbert downdraft, throatless downdraft, crossdraft and two stage gasifiers. Updraft gasifiers are suitable for gasification of biomass containing high ash (up to 15 %) and high moisture content (up to 50 %) and generate producer gas having high tar content (50–100 g/Nm3). The high temperature (830 oC) air gasification of biomass in updraft gasifiers increase the lower calorific value of producer gas and reduce the tar content. The updraft gasifiers have been used for gasification of bark, wood blocks, chips and pellets, straw, maize cobs, refuse derived fuel (RDF), and waste pellets with air and...
Ano: 1969 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/960
Imagem não selecionada

Imprime registro no formato completo
A Review of Oil Palm Fruit Plantation and Production under the Contract- Growers Scheme in Andhra Pradesh and Tamil Nadu States of India CIGR Journal
O. K Owolarafe; C. Arumughan.
An assessment of the oil palm plantation management and fruit supply, under the Indian contract-growers scheme was conducted in this study. Data was collected from about 96 plantations on the age of plantation, size of plantation, cost of establishment, maintenance practices and cost , yield of fresh fruit bunches, profitability of the scheme for the farmers and so on. It was observed that most of the plantations (69.8%) are in the range of 6-10 years of age while the size of 1-5 ha dominates the sample (76%). Farmers are able to procure land and source fund for the establishment of plantations. Farmers also perform maintenance activities (irrigation, weeding and fertilizer application) satisfactorily, though incure considerable cost on the activities....
Ano: 1969 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/959
Imagem não selecionada

Imprime registro no formato completo
A review on applications of greenhouse drying and its performance CIGR Journal
Sahdev, Ravinder Kumar; Kumar, Mahesh; Dhingra, Ashwani Kumar.
Limited sources and rising cost of fossil fuels has instigated researchers to look towards renewable energy resources.  Among renewable energy resources, solar energy is required to become indispensable in the future, as it is inexpensive, abundant, inexhaustible, environmental friendly and non-pollutant.  Most of the people living in developing countries are dependent on agriculture.  Agricultural products are dried to increase the storage life, minimize the packaging requirement and reduce the transportation weight.  Solar drying for drying agricultural products is being practiced since long back throughout the world.  Because of its drawbacks, advance technique, i.e. greenhouse drying, is being adopted for drying crops to reduce the drying time and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Greenhouse drying; Agricultural products; Convective heat transfer coefficient; Energy and exergy analysis; Economical aspects; Drying performance.
Ano: 2016 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3530
Imagem não selecionada

Imprime registro no formato completo
A SCHEDULING-BASED ALGORITHM FOR LOW ENERGY CONSUMPTION IN SMART AGRICULTURE PRECISION MONITORING SYSTEM CIGR Journal
Ajao, Lukman Adewale.
The worldwide connectivity design of embedded wireless sensor-based Internet of Things (IoT) using 6LoWPAN platform has significantly increases in industry. However, the development of smart technology in agriculture precision for remote control, monitoring and sensing usually encounter some challenges in the IoT architecture, these include: high power consumption, interoperability, security, and end-to-end communication. In this paper, the authors developed a smart agriculture precision monitoring system using scheduling-based algorithm techniques to accomplished low energy consumption during the system operations. The IEEE 802.11 b/g/n technology (ESP 8266) was used as IoT gateway, ATmega 2560 development chip, with other wireless sensor nodes (such as...
Tipo: Info:eu-repo/semantics/article
Ano: 2020 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5929
Imagem não selecionada

Imprime registro no formato completo
A Serial Domain Decomposition Method for Discrete Element Method Simulation of Soil–Wheel Interactions CIGR Journal
Hiroshi Nakashima; Kyoto University.
We applied a serial domain decomposition method (DDM) to our two-dimensional discrete element method (DEM) program and investigated the effectiveness of DDM in terms of computer hardware. The developed program could obtain sufficiently accurate results for wheel slip, traction, and gross traction, comparable to DEM without serial DDM. We also confirmed that the soil deformation field under the wheel for DEM with serial DDM was similar to that for DEM without DDM. Moreover, the increased sub-domain loop was effective in reducing computational time in the case of serial DDM. Since each sub-domain loop contains the time integration and coordinate update routine, further optimization of memory usage in our serial DDM may be possible, which would allow...
Ano: 1969 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/1239
Imagem não selecionada

Imprime registro no formato completo
A strategy for workplace health promotion on German dairy farms CIGR Journal
Jakob, Martina Carola; Thinius, Maxi.
Studies across the globe have shown that at least 3 out of 5 milkers experience pain in the musculoskeletal system (MSS), mostly in the upper extremities (DOUPHRATE et al., 2014, JAKOB, 2011, KOLSTRUP, 2012, PINZKE, 2003, TUURE & ALASUUTARI, 2009, KAUKE et al., 2010, THINIUS, 2012). The World Health Organisation (WHO) defines health as a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity. It is well known that dairy farming, and milking in particular is coupled with several risk factors for developing musculoskeletal disorders (KOLSTRUP, 2012). Technical measures seem to be insufficient to avoid physical overload. Therefore a more comprehensive approach seems to be necessary. In this study, four...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ergonomics; Health; Safety workplace health promotion dairy farms ergonomics TOP principle participatory approach.
Ano: 2015 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3183
Imagem não selecionada

Imprime registro no formato completo
A study of a shock-absorber for a front-end loader modified for agricultural purposes with an electrohydraulic directional valve CIGR Journal
Kim, Hak-Jin.
A front-end loader for agricultural purposes is the most commonly used implement for agri-tractors in Korea. As it is operated to raise, lower and carry various objects in a farming field, it introduces a large amount of stress to a tractor, causing vibrations and often lead to a mechanical breakdown. These high stresses are observed at the starting and ending points of operation, that is, the points at which the highest acceleration and deceleration occur. To reduce the sudden change of the speed, soft-start & end operation were tested with an electrohydraulic directional valve, which has a built-in ramp time spool control function. This valve was controlled by SAE-J1939 associated messages via CANBUS. This shock-absorbing system contains three ECUs...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Front-end loader; Shock absorbing; Electrohydraulic directional valve; J1939; ECU..
Ano: 2015 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3136
Imagem não selecionada

Imprime registro no formato completo
A STUDY OF SOME HYDRO-THERMAL PROPERTIES OF SANDBOX (HURA CREPITANS) SEED CIGR Journal
IDOWU, David Oluwafemi; Abegunrin, Peter Toyin.
ABSTRACT Thermal properties of crops are very important in the design of drying, processing and storage equipment. The availability of thermal properties data on Hura creptance seed will assist in machine design, equipment manufacturing and the seed processing where they required heat treatment. The specific heat, thermal conductivity and thermal diffusivity of Hura creptance seed were determined as a function of moisture content which varies from 6 to 20% (d.b). The results of the experiment on the moisture content-related thermal properties were analyzed using regression analysis. The specific heat capacity of the seed was found to be in the range 0.0681- 0.2949J/Kg oC with temperature range of 40 to 80oC, while the thermal conductivity was found to be...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Post harvesting Processing:Engineering properties; Design of machines.
Ano: 2014 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2806
Imagem não selecionada

Imprime registro no formato completo
A study the effect of two machine types in some technical indicators CIGR Journal
Alwan, salih kadhim.
The experiment has been conducted to evaluate the effect in some technical indicators of  husking and whitening machines for cultivar rice (DM), in the labrotaries of the Tehran University in 2015. This research includes the using of two types of  machines (Satake and Yanmar),),under three clearance between cylinders levels  0.4 , 0.6 and 0.8  mm  and three grain moisture levels  10-12% , 12- 14% and 14-16%. The results showed that the Satake type machine is significantly better than the Yanmar type machine in all studies properties  .While clearance o.8 significant superiorly on two  0.4,0.6 mm levels as well as moisture cotent of grain 10-12%  is superior significantly on two 12-14%,14-16% levels in  all studied properties . The best results have come...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Agriculture engineering Husking; Grain moisture content; Machine; Clearance; Rice; Technical indicators.
Ano: 2016 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3840
Imagem não selecionada

Imprime registro no formato completo
A Survey on some date palm orchards parameters applicable in date palm mechanization CIGR Journal
NOURANI, Ahmed; KADRI, Ahmed; MEHENNI, Mokhtar; SALEM, Ahmed.
The aim of this work is determination a several date palm related-information to be utilized in designing of date palm service machines. Different parameters were collected from 37 farms in Biskra province, due its importance in Algerian dates production, such as: height of trees (to crown), circumferences of trees and position of the dates bunch in the tree, number of tractor, irrigation mode. According to the results of this survey, several points were defined applicable in date palm mechanization, such as the machine work height must reach up 8 m higher, in minimum and the irrigation channels and the intercropping are, generally, along the rows which facility the displacement of wheeled machine.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Date palm – mechanization – height of tree – irrigation mode – service machine.
Ano: 2015 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2943
Imagem não selecionada

Imprime registro no formato completo
A Table Mounted Device for Cracking Dika Nut (Irvingia gabonensis) CIGR Journal
B. S. Ogusina; Obafemi Awolowo University,; O. A. Koya; Obafemi Awolowo University,; O. O. Adeosun; Obafemi Awolowo University.
A simply designed machine for cracking dika nut was fabricated. The nut is fed by hand inbetween a toggle mechanism comprising of the slider and a fixed block. Fracture mechanism was based on the deformation characteristics of dried dika nut under uni-axial compression. When actuated, the slider compresses the nutshell to failure along its line of symmetry. The experimental machine gave 100% cracking efficiency but with 24% kernel breakage in cracking sun-dried dika nut at 6.6% moisture content (w.b). The machine provides a viable and effective technique for safe dika kernel extraction.
Ano: 1969 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/1096
Imagem não selecionada

Imprime registro no formato completo
A Theoretical Approach for Determining Irregularities of the Bottom of the Tillage Layer Caused by Horizontal Axis Rotary Tillers CIGR Journal
Ahmed Celik; Ismail Ozturk; Thomas R. Way.
Horizontal axis rotary tillers produce irregularities in the tillage depth when they are inappropriately operated and constructed. In such cases, mixing and breaking of soil throughout the tillage layer is not uniform and some untilled ridges will remain at the bottom determining the effect of design and operational characteristics on the height of the resultant ridges at the bottom of the tillage layer. In this study, a method based on the derived geometrical relationships between the rotary tiller operational parameters was developed to determine heights of ridges occurring at the bottom of the tillage layer. The ridge heights can be calculated for various combinations of blade peripheral speed, forward travel speed, rotor radius, and the number of...
Ano: 1969 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/1168
Imagem não selecionada

Imprime registro no formato completo
A Two Degree of Freedom Damped Fruit Tree Model CIGR Journal
Láng, Zoltán; Csorba, Lászó.
A simple two degree of freedom fruit tree model was built and some of its behaviour was compared with real cherry trees. The model represented from one hand the rooting system with a certain amount of soil and of the trunk, from the other hand the main branches and limb.  The calculated results for the model have shown good accordance with the test results of the measured real tree: in both cases two peaks in the amplitude and acceleration vs.  frequency diagrams were clearly recognizable. Using the equation of the model the effect of shaker parameters and shaking frequency can be studied, which enables more accurate design of the shaker machine.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Agricultural engineering fruit tree modelling; Mechanical shaking; Shaker machine.
Ano: 2015 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3298
Imagem não selecionada

Imprime registro no formato completo
A wireless sensor network for vineyard management in Sicily (Italy) CIGR Journal
Catania, Pietro; Vallone, Mariangela; Lo Re, Giuseppe; Ortolani, Marco.
Wine quality depends on many factors, such as the choice of variety, stock, training system, pruning as well as environmental parameters and cultivation techniques performed in the vineyard.  Monitoring the micro-climate of grapevine allows to conveniently perform the most important cultivation techniques (soil management, pesticide treatments, green pruning, harvest) thus reducing the operating costs of the vineyard, and increasing the overall quality of the grapes.  The aim of the present study is to monitor the micro-climate of grapevine in order to control spring period hazards, to reduce the operating costs of the vineyard and to increase the quality of grapes.  For this purpose a Wireless Sensor Network was used, and a comparison was performed...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Agricultural mechanization; Management vineyard temperature relative humidity Wireless Sensor Network (WSN).
Ano: 2013 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2615
Imagem não selecionada

Imprime registro no formato completo
Ability of some woody trees for growth under the stress of irrigation with wastewater CIGR Journal
Mazher, Azza.
This experiment was carried out during two successive seasons of 2014 and 2015 at the National Research Centre, Dokki, Giza, Egypt, to investigate the effect of irrigation with two types of water (Tap water and Waste water) on growth, and chemical composition of some seedlings of woody trees (Terminalia angustifolia, Rademachera ignea  and Ficus mango). Growth parameter (plant hight(cm), No. of leaves/plant, length of root (cm) and stem dimeter (cm) increased significantly in all seedlings by using waste                              water than tap water, except in Rademachera ignea  seedlings irrigated with tap water significantly increased number of leaves compared with wastewater. Irrigation with wastewater significantly increased fresh and dry weight of...
Tipo: Info:eu-repo/semantics/article
Ano: 2018 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4537
Imagem não selecionada

Imprime registro no formato completo
Accident at work with fertilizer distributors in Austrian agriculture CIGR Journal
Kogler, Robert; Quendler, Elisabeth; Boxberger, Josef.
Accidents with fertilizer distributors at work happen in the Austrian agriculture every year.  In accordance with Machinery Directive 2006/42/EC and the standards ISO 4254-1 and DIN EN 14017, fertilizer distributors undergo a risk assessment before construction and market entry to ensure their complying with these legal recommendations and to eliminate largely the risk of injury for the operators.  To determine the accident scenarios, causes, and technical solutions, a narrative analysis of 14 reports of accidents that led to moderate and serious injuries from 2008 to 2010 was done, eight victims interviewed, and seven accident machines and eight new ones, which were sold in 2013, evaluated according to applicable regulations.  Mostly farm managers were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Work safety; Ergonomics Agricultural machinery; Fertilizer distributors; Accident analysis; Statistical analysis.
Ano: 2014 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2941
Imagem não selecionada

Imprime registro no formato completo
Accuracy and precision of phytonematode sampling plans CIGR Journal
Abd-Elgawad, Mahfouz Mohamed Mostafa.
Sampling accuracy and precision are basic to nematode research and rational management decision. Taylor's Power Law is used to determine sample size. The published power law parameters are used here differently to define levels of reliability associated with a fixed, cost-determined, sample size. Such levels may provide the decision-maker with more informative data on sampling methods and their reliabilities. Instead of solving for unknown sample number, the rearranged equation to solve for sampling accuracy permitted the use of exact Student’s t-values. The t-values for confidence limits and standard normal variate were used. Both statistical techniques resulted in identical confidence band, in terms of being below, at, or above the economic threshold...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Action thresholds; Berseem clover; Citrus; Economics; Nematode distribution; Rice.
Ano: 2018 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4371
Imagem não selecionada

Imprime registro no formato completo
Acoustic impulse response of young coconut (Cocos nucifera L.) fruits in relation to maturity CIGR Journal
Suministrado, Delfin C..
Acoustic impulse responses of young coconut fruits were analyzed using Fourier analysis and the correlation of signal characteristics with the mucous-like stage, cooked rice-like stage and leather-like stage maturity levels was determined. Analyses of sound signals of unshaved and shaved fruit samples were performed to determine if the difference in acoustic response could help enhance the differentiation of the fruits at different maturity levels. Results of statistical analysis showed that the frequency of the impulse response of the unshaved fruits increases with maturity levels and are significantly different from each other, while those of the shaved fruits are not. Also, results of regression analysis showed that as the fruits mature and the meat or...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Young coconut fruit; Acoustic impulse response; Frequency analysis.
Ano: 2021 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/6309
Imagem não selecionada

Imprime registro no formato completo
Actual and Predicted Evapotranspiration Along with Groundwater Contribution for Wheat Crop CIGR Journal
Dahri, Shahzad Hussain; Mangrio, Munir Ahmed; Shaikh, Irfan Ahmed; Dahri, Zakir Hussain; Syed, Ain-ul-Abad; Jakhrani, Jazib Hussain; Syed, Taimoor Ali.
This experiment aimed to determine the crop evapotranspiration (ETc), groundwater input in total water used by wheat crop, and to simulate the CROPWAT model to envisage the crop evapotranspiration rate. To estimate on-field ETc and groundwater contribution the combining lysimeter technique was used. The water levels below the soil surface were kept at 1.60, 2.20, and 2.80 m and each water table depth was replicated three times. The experiment was conducted under silt loam (SL) and silty-clay loam (SCL) soil conditions. The climatic parameters and water balance components were recorded accordingly. The on-field ETc was compared with the predicted ETc by CROPWAT model. Under SL soil, the observed ETc was 442, 427, and 401 mm at the water table depth of 1.60,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Water conservation; Irrigation amount; Groundwater; And Crop evapotranspiration.
Ano: 2021 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/6605
Imagem não selecionada

Imprime registro no formato completo
Adaptation of a Brush Cutter for Kenaf (Hibiscus cannabinus) Harvesting CIGR Journal
Falana, Olumide Babatope; Aluko, Olabanjo Bankole; Adetan, Dare A; Osunbitan, Jimmy Akinfemi.
The adaptation of some existing technologies such as sugarcane-type harvester, jute/reed-type harvesters and forage harvesters for kenaf harvesting has not been successful. These machines apart from being expensive cut kenaf stems into too short fragments. Information regarding machines for kenaf harvesting is rarely found in the literature. In this work, an existing 1.65 kW brush cutter was modified and adapted for kenaf harvesting with the view to developing a low-cost machine for kenaf harvesting. The modifications made include incorporating a suitable metal guard based on the physical properties of kenaf stem and selection of an appropriate serrated blade cutting mechanism. The machine was tested on an experimental field of 3 and 4 months old kenaf...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Kenaf harvesting; Modified brush cutter; Performance evaluation..
Ano: 2020 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5567
Registros recuperados: 1.391
Primeira ... 123456789 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional