|
|
|
| Registros recuperados: 29 | |
|
|
| Talamantes Castorena, Ismael. |
| El estado de Sinaloa es el principal productor de maíz en México bajo riego, aportando el 65% de la producción nacional, sin embargo, la eficiencia de aplicación de riego se mantiene en 45% y escenarios frecuentes de baja disponibilidad hídrica, han puesto en riesgo la estabilidad económica y social del estado. Con el fin de generar alternativas tecnológicas de aplicación inmediata que contribuyan a mejorar la eficiencia en el uso del agua del maíz, en el presente estudio se evaluaron cinco técnicas parcelarias de riego por gravedad de alta eficiencia: 1) surcos alternos, 2) camas, 3) reducción de gasto, 4) riego intermitente y 5) riego deficitario, comparándolas con el sistema tradicional (testigo). El estudio se realizó en el distrito de riego 075 (norte... |
|
Palavras-chave: Diseño; Riego de precisión; Productividad del agua; Rendimiento; Design; Irrigation technique; Water use efficiency; Yield; Hidrociencias; Maestría. |
| Ano: 2013 |
URL: http://hdl.handle.net/10521/2136 |
| |
|
| |
|
| |
|
|
| Campos,Alessandro T.; Castro,Jaqueline de O.; Schiassi,Leonardo; Yanagi Junior,Tadayuki; Pires,Maria de Fátima Á.; Mattioli,Cristiano C.. |
| The goal of this study was to develop a fuzzy model to predict the occupancy rate of free-stalls facilities of dairy cattle, aiding to optimize the design of projects. The following input variables were defined for the development of the fuzzy system: dry bulb temperature (Tdb, °C), wet bulb temperature (Twb, °C) and black globe temperature (Tbg, °C). Based on the input variables, the fuzzy system predicts the occupancy rate (OR, %) of dairy cattle in free-stall barns. For the model validation, data collecting were conducted on the facilities of the Intensive System of Milk Production (SIPL), in the Dairy Cattle National Research Center (CNPGL) of Embrapa. The OR values, estimated by the fuzzy system, presented values of average standard deviation of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Confinement systems; Bovine facilities; Design; Stalls; Dairy cattle. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000600001 |
| |
|
|
| Almeida,Alex N. de; Coelho,Rubens D.; Costa,Jéfferson de O.; Farías,Asdrúbal J.. |
| ABSTRACT: In Brazil, the conventional center pivot is widely used for irrigation of agricultural crops and its use has grown continuously. However, when improperly managed, it facilitates the development of diseases in all parts of the plant, with a direct effect on productivity, besides favoring losses of water by evaporation. The drip may be an alternative, since it minimizes the losses and does not wet the aerial parts of the plants, thereby reducing the incidence of diseases. A new system called localized mobile drip irrigation (IRGMO) is being developed in an attempt to combine the practicality and rusticity of the center pivot with the efficiency and water savings of the dripping irrigation systems. This fusion system is the central pivot with drip... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Design; Drip irrigation; Center pivot. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000400828 |
| |
|
|
| SOARES, J. M.. |
| A irrigação por aspersão e uma maneira prática de aplicação de água no solo para qualquer cultura ou solo. Um sistema de irrigação por aspersão pode aplicar água no solo em intensidades iguais ou menores que a sua velocidade de infiltração, além da possibilidade de ser manejado automática ou manualmente. Em geral, a irrigação por aspersão pode ser empregada em muitas condições de solo e topografia e em áreas onde a irrigação por superfície apresenta-se ineficiente e dispendiosa. O aspersor e a parte mais importante do sistema de irrigação por aspersão. Uma ampla classificação em tipos de aspesores e bocais permite ao projetista selecionar o aspersor apropriado e a pressão de serviço para satisfazer um solo específico e/ou requerimento da cultura. Fatores... |
| Tipo: Circular Técnica (INFOTECA-E) |
Palavras-chave: Dimensionamento.; Irrigação; Aspersão.; Irrigation; Design; Sprinkler irrigation.. |
| Ano: 1986 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/133409 |
| |
|
|
| Michel, J; Duranton, R. |
| Autonomous Underwater Vehicles, also called "free-swimming vehicles" are self propelled bodies, equipped with their own energy package and with no solid communication link with the surface. At the beginning of the 90s, a renewed interest from the Underwater Intervention Community for autonomous vehicles and quite a number of new projects were announced or started. The present paper aims at presenting an updated State of the Art on the development of autonomous vehicles. It addresses the following points: A brief historical review presents some existing systems and uses. The French experience, in particular, allows to position the potential, and complementary contribution of autonomous vehicles, in a range of various operational systems. A short review of... |
| Tipo: Text |
Palavras-chave: Design; Research; Research programmes; Historical account; Marine technology; Free swimming vehicles. |
| Ano: 1990 |
URL: http://archimer.ifremer.fr/doc/1990/acte-1135.pdf |
| |
|
| |
|
| |
|
| |
|
| |
|
|
| Batabyal, Amitrajeet A.. |
| The combination of a general greening of international political debate, and the events of 1992 at the Rio Earth summit have led to great interest in the question of global environmental protection. While it is recognized that international environmental agreements (IEAs) are the means by which the earths fragile environment is most likely to be protected, this recognition has been recent. Hence, there is very little formal research on the design and study of IEAs. As such, in this paper, I propose and describe a research agenda for the design and study of IEAs. Very generally, I propose that we frame the IEA design question as a problem in mechanism design. We will then be able to use, inter alia, the theory of common agency and the theory of hierarchies... |
| Tipo: Working or Discussion Paper |
Palavras-chave: International; Environmental; Agreement; Design; Game; Environmental Economics and Policy; International Relations/Trade; D73; D82; L50. |
| Ano: 1996 |
URL: http://purl.umn.edu/28353 |
| |
|
| |
|
| |
|
|
| Constantino,Rodrigo A.; Lopes Neto,José P.; Nóbrega,Marcilene V. da; Nascimento,José W. B. do; Silva,Jefferson H. G. da. |
| ABSTRACT The use of synthetic fibers as reinforcement for concrete replacing the steel reinforcement has been diffused worldwide in several applications, gaining prominence in the application for industrial floors, tunnel linings, road pavements, etc., i.e., continuous structures in contact with soil that require performance in the elastic medium. The present study investigated the applicability of concrete reinforced with synthetic fibers in the bottom slab of silos supported directly on the ground, being composed of an experimental study and a case study. The experimental study consisted of the analysis of the mechanical behavior of this concrete by testing three concentrations of synthetic fibers (3.0, 4.5 and 6.0 kg m-3) in a conventional simple... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mechanical behavior; Design; Alternative materials. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662020000400274 |
| |
|
|
| Silva,Evandro P. da; Silva,Fábio M. da; Andrade,Ednilton T. de; Magalhães,Ricardo R.. |
| ABSTRACT Coffee harvesters are subject to stresses and vibrations in their structure, originating from engines and harvesting system. These structures must be designed to avoid rupturing of the components due to fragility of the materials, inadequate geometries, or the phenomenon of resonance, which increases the displacements/deformations of the components. In this scenario, the main objective of this study is to analyse the results of stresses and displacements from two static simulations and to present results of natural vibration frequencies from two modal simulations in a self-propelled coffee harvester. For this purpose, 20 modal shapes were generated, considering coffee harvester reservoir as empty and full. The simulations were carried out using... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Design; Vibration; Resonance; Stresses; Displacements. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000700511 |
| |
|
| |
|
| |
|
| |
|
|
| Bakhtiari, Mohammad Reza. |
| Potato is one of the most important agricultural products that has great nutritional and industrial value. Potato seed tubers are usually used for growing this crop, but separating the seed tubers from the edible ones is tedious, time consuming and costly process. Therefore, a rotating potato sorting machine was designed, developed and evaluated in this research. This machine was able to sort potato tubers according to their size. Effects of sieves slope angle and rotational speed on the tubers mechanical damage, sorting accuracy and capacity of designed machine were evaluated. The test was conducted in the factorial experiment format with three replications based on a completely randomized experimental design. Three levels of sieves slope angle (5, 10 and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Design; Development; Edible; Potato; Seed; Sorting. |
| Ano: 2022 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/7299 |
| |
| Registros recuperados: 29 | |
|
|
|
