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| Registros recuperados: 26 | |
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| ROCHA NETO,ODÍLIO C. DA; TEIXEIRA,ADUNIAS DOS S.; BRAGA,ARTHUR P. DE S.; SANTOS,CLEMILSON C. DOS; LEÃO,RAIMUNDO A. DE O.. |
| Precision irrigation seeks to establish strategies which achieve an efficient ratio between the volume of water used (reduction in input) and the productivity obtained (increase in production). There are several studies in the literature on strategies for achieving this efficiency, such as those dealing with the method of volumetric water balance (VWB). However, it is also of great practical and economic interest to set up versatile implementations of irrigation strategies that: (i) maintain the performance obtained with other implementations, (ii) rely on few computational resources, (iii) adapt well to field conditions, and (iv) allow easy modification of the irrigation strategy. In this study, such characteristics are achieved when using an Artificial... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Precision irrigation; Automation; Neural algorithms. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162015000200266 |
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| Valença,David da Cunha; Carvalho,Daniel Fonseca de; Reinert,Fernanda; Azevedo,Ricardo Antunes; Pinho,Camila Ferreira de; Medici,Leonardo Oliveira. |
| ABSTRACT: Concerns with water crisis involve all sectors of society and irrigated agriculture remains the main water consumer. This study evaluated an agricultural production system for lettuce cultivation in greenhouse, “organic potponics”, to economize water and manure use, using a Simplified Irrigation Controller (SIC), based on soil matric potential monitoring. Five irrigation volumes were evaluated in pots with 4.8 L, fertilized with 200 g of vermicompost. One of the volumes was controlled with the SIC. The other volumes represented 130, 80, 60 and 33 % of that controlled by the SIC and all treatments received water at the same time. Shoot fresh weight, head diameter and stomatal conductance (gs) increased linearly with irrigation volumes. For shoot... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lactuca sativa; Water use efficiency; Production system; Water management; Automation. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000100052 |
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| Silva,Irenilson M. da; Pandorfi,Héliton; Almeida,Gledson L. P.; Guiselini,Cristiane; Henrique,Hugo M.. |
| The aim of this paper was to evaluate the automated acclimatization effects during pre-milking of cows on thermal conditioning, physiology, milk production and cost-benefit of the automated adiabatic evaporative cooling system (AECS). The treatments 20; 30; 40 min and control consisted of exposure time of pre-milking cows to the automated AECS. Sixteen cows were used with an average daily milk yield of 19 kg, distributed in a 4 x 4 Latin square design. The Tukey's test (P<0.05) was used to compare the means. The environmental variables, dry bulb temperature (DBT, ºC) and relative humidity (RH, %), were recorded every minute, which allowed the determination of the system efficiency through the Temperature and Humidity Index (THI). The respiratory rate... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Thermal comfort; Automation; Dairy cattle; Evaporative cooling system. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162011000500002 |
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| Saretta,Ezequiel; Camargo,Antonio P. de; Botrel,Tarlei A.; Pinto,Marinaldo F.; Katsurayama,Geancarlo T.; Frizone,José A.. |
| ABSTRACT Current meters are equipment widely used for estimating flow velocity in rivers and streams. Periodic calibrations of current meters are important to ensure the quality of measurements, but the required testing facilities are complex and only available in a few institutions. However, advances in electronics and automation may contribute to developing simple and reliable calibration systems. Thus, this study aimed to develop an automated system for testing current meters, which consisted of a trapezoidal channel, a step motor, a tow car and a management system, composed of a supervisory application and microprocessed modules to control the motor and the data acquisition. Evaluations of the displacement velocity showed that it matched the reference... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hydrometry; Electronics; Automation; Calibration. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000200181 |
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| Jordão,Marcelo D. L.; Paiva,Kary de; Firmo,Heloisa T.; Inácio,Caio T.; Rotunno Filho,Otto C.; Lima,Tomé de A. e. |
| ABSTRACT Temperature monitoring is an important procedure to control the composting process. Due to cost limitation, temperature monitoring is manual and with daily sampling resolution. The objective of this study was to develop an automatic station with US$ 150 dollars, able to monitor air temperature at two different points in a compost pile, with a 5-min time resolution. In the calibration test, the sensors showed an estimated uncertainty from ± 1 to ± 1.9 ºC. In the field validation test, the station guaranteed secure autonomy for seven days and endured high humidity and extreme temperature (> 70 °C). |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Organic waste; Automation; Social technology; Arduino. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017001100809 |
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| VIVALDI,ENNIO A; BASSI,ALEJANDRO; ESTRADA,JORGE; GARRIDO,IGNACIO; DÍAZ,JAVIER; OCAMPO-GARCÉS,ADRIÁN. |
| A computer-based system that automates sleep studies, including sleep deprivation paradigms, is described. The system allows for total or REM-specific sleep deprivation and is based on a reliable, fast-responding, on-line state detection algorithm linked to a dependable intervention device. Behavioral state detection is achieved by dimensión reduction of short-term EEG power spectrum. Interventions are made by serial outputs to servomotors that move a cage with different patterns and variable intensity. The system can adapt itself to individual characteristics and to changes in recording conditions. Customized protocols can be designed by defining the states or stages to be deprived, including scheduling temporal patterns. A detailed analysis of the... |
| Tipo: Journal article |
Palavras-chave: Sleep; Sleep deprivation; Biosignal analysis; Digital control; Automation. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602008000400009 |
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| Ferrarezi,Rhuanito S; Iersel,Marc W van; Testezlaf,Roberto. |
| ABSTRACT: Subirrigation applies water and nutrients to the bottom of pots without wetting leaves, improving water use and reducing disease spread compared to overhead irrigation systems. However, water levels applied within the benches are often higher than required to promote capillary action, applying more water than needed and wasting pumping energy. The present study was conducted to evaluate the effect of different water levels on plant growth of subirrigated salvia (Salvia splendens) 'Vista Red' in two substrates. Five water levels (0.75, 1.5, 3.0, 4.5, and 6.0 cm) and two substrates {pine bark: sphagnum peat moss and peat: perlite (both 75%: 25% v/v)} were tested, with four replications. Substrate moisture was monitored by capacitance-type sensors... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Salvia splendens; Subirrigation; Automation; Capacitance sensors; Irrigation; Water management.. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362016000200202 |
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| Lepoupon, C; Lin, Rg; Benaim, Jy; Merks, Aga. |
| The accurate classical batch method of Duursma (1961), based on the conversion of Dissolved Organic Nitrogen (DON) into NH3, is used as a basis for a new automatic DON analyser. After testing different possibilities through mechanical automation of the original batch technique, in which the conversion is preceded by the degassing of NH3 and drying of the sample, the procedure of autoanalyses has been selected. This procedure was simplified to the extent that a compact unit could be constructed, which would easily be applicable on board ship. The automatic method has a conversion phase in which in principle only DON is dissociated to NH4+, whereas both NO2- add NO3- are not reduced. This requires selective conditions and particularly high silver purity for... |
| Tipo: Text |
Palavras-chave: Dissolved organic nitrogen; Analysis; Automation; Reduction; Total nitrogen. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00093/20456/18128.pdf |
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| Registros recuperados: 26 | |
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