Consulta: creatorFacets:"Antuniassi,Ulisses R."
Registros recuperados: 13
Data/hora: 09/06/2024 06:34:51

Air flow humidification for air-assisted boom sprayer
Provedor de dados: 70
Autores: Stanislavski,Wilson M.; Antuniassi,Ulisses R.; Chechetto,Rodolfo G.
The air-assisted ground spray is fairly widespread. However, due to the unpredictable weather conditions, the operational efficiency is impaired by stops on grounds of low humidity and high temperatures. The aim of this work was to assess an air humidification method and evaluate its impact on temperature and air humidity for the air curtain of the air-assisted sprayer. With respect to relative air humidity, it has increased in 6.59%, being the maximum change when inserting 1.92 L min-1. So, it is concluded that the pipeline humidification might significantly reduce temperature and enhance air humidity. The treatments performed in this study consisted of a varied flow of a humidity device, related to weather conditions. Temperature and relative air...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Weather Conditions; Air-assisted Boom; Application Technology.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000100006

Modelo de programação linear para seleção de pulverizadores agrícolas de barras
Provedor de dados: 70
Autores: Baio,Fábio H. R.; Antuniassi,Ulisses R.; Balastreire,Luiz A.; Caixeta Filho,José V.
A seleção de pulverizadores agrícolas que se adaptem às necessidades da propriedade, é um processo trabalhoso, sendo uma das etapas mais importantes dentro do processo produtivo. O objetivo do presente trabalho foi o de desenvolver e utilizar um modelo de programação linear para auxiliar na seleção de pulverizadores agrícolas de barras, baseado no menor custo horário do equipamento. Foram utilizadas as informações técnicas referentes a 20 modelos de pulverizadores disponíveis no mercado, sendo quatro autopropelidos, oito de arrasto e oito do tipo montado. A análise de sensibilidade dos componentes dos custos operacionais mostrou que as taxas de reparo e depreciação foram os fatores que mais interferiram na variação do custo horário do conjunto...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Programação linear; Tratamento fitossanitário; Máquinas agrícolas.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162004000200014

SPECTRUM, VELOCITY AND DRIFT OF DROPLETS SPRAYED BY NOZZLES WITH AND WITHOUT AIR INDUCTION AND MINERAL OIL
Provedor de dados: 70
Autores: França,Jorge A. L.; Cunha,João P. A. R. da; Antuniassi,Ulisses R.
ABSTRACT The aim of this study was to evaluate the spectrum, the velocity and the potential drift risk of droplets sprayed by nozzles with and without air induction, with the addition of mineral oil to the spray solution. The experiment was conducted in a completely randomized design with five replications; in a factorial model 2 × 2 (two spray nozzles and spray solution with and without mineral oil Assist®). Spray nozzles with and without air induction were evaluated, with nominal flow rate of 1.14 L min−1 and pressure of 300 kPa. The spectrum and the velocity of droplets were evaluated directly, using a droplet analyzer (VisiSize D30) in real time based on the analysis of high-resolution images. The drift potential was evaluated in an open circuit wind...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adjuvants; Droplet size; Application technology.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000300502

Potential of adjuvants to reduce drift in agricultural spraying
Provedor de dados: 70
Autores: Oliveira,Rone B. de; Antuniassi,Ulisses R.; Mota,Alisson A. B.; Chechetto,Rodolfo G.
The reduction of pesticide spraying drift is still one of the major challenges in Brazilian agriculture. The aim of this study was to evaluate the potential of different adjuvant products, such as surfactants, drift retardants, mineral oil and vegetable oil for reducing drift in agricultural spraying. The experiment consisted of quantifying drift of sprayings of 18 adjuvants dissolved in water under controlled conditions in a wind tunnel. Tests were performed in triplicates with spraying nozzles type Teejet XR8003 VK, pressure of 200kPa and medium drops. Solutions sprayed were marked with Brilliant Blue dye at 0.6% (m v-1). The drift was collected using polyethylene strips transversally fixed along the tunnel at different distances from the nozzle and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wind tunnel; Drift retardant; Mineral oil; Vegetable oil; Surfactant.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000500010

SPRAY DRIFT AND PEST CONTROL FROM AERIAL APPLICATIONS ON SOYBEANS
Provedor de dados: 70
Autores: Cunha,João P. A. R. da; Barizon,Robson R. M.; Ferracini,Vera L.; Assalin,Marcia R.; Antuniassi,Ulisses R.
ABSTRACT Pesticide drift is an issue in modern farming, mainly for crops under constant spraying as soybeans. This study aimed at assessing drift and pest control for aerial applications in soybean crops. Hydraulic nozzles and rotary atomizers, regulated to a wide spectrum of droplet sizes, sprayed thiamethoxam plus lambda-cyhalothrin using an agricultural aircraft Ipanema 202A at volume rate of 20 L ha−1. Treatments consisted of testing two devices: a rotary cage atomizer (Micronair AU 5000) with blade angles of 65° for larger droplets, and with angle of 55° for smaller ones; and a set of adjustable nozzles (Stol model) with deflector angle of 90° for smaller droplets, and with angle of 30° for larger ones. Drift was evaluated through quantification of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agricultural aviation; Crop protection; Exodrift; Glycine max.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000300493

Effect of adjuvants on the amount of air included in droplets generated by spray nozzles
Provedor de dados: 70
Autores: Mota,Alisson A. B.; Antuniassi,Ulisses R.; Chechetto,Rodolfo G.; Oliveira,Rone B. de; Silva,Anne C. A. e.
The air included in droplets generated by spray nozzles directly int0erferes in transport, deposition and retention of the droplets after its impact on the target. The objective of this study was to analyze the interference of adjuvants in the amount of air included in droplets generated by spray nozzles. The treatments were composed by four spray solutions containing mineral oil, vegetable oil, surfactant and water, and three spray nozzles, two air induction type and one pre-orifice. The air included was calculated by the difference between the volume of spray mix (air plus liquid) and only the liquid, which was made by means of sprayed samples captured in a funnel and collected in a graduated cylinder. The surface tension was estimated by the gravimetric...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Application technology; Air induction; Pre-orifice; Surface tension.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000600020

Systems of aerial spraying for soybean rust control
Provedor de dados: 70
Autores: Antuniassi,Ulisses R.; Velini,Edivaldo D.; Oliveira,Rone B. de; Peres-Oliveira,Maria A.; Figueiredo,Zulema N.
The soybean rust caused by Phakopsora pachyrhizi is considered the main soybean disease and consequently the appropriate selection and the use of spraying equipment are vital for its control. The aim of this study was to evaluate the performance of aerial application equipment for soybean rust control. It was used: Micronair AU 5000 at 10 L ha-1 (with oil) and at 20 L ha-1 (without oil); Stol ARD atomizer at 10 and 20 L ha-1 (both with oil) and Spectrum (electrostatic) at 10 L ha-1 (without oil). The adjuvant was cotton oil (1.0 L ha-1) with emulsifier (BR 455) at 0.025 L ha-1. The field trial was set up at the 3rd fungicide application, when f four replications of each treatment. There were no statistical differences among treatments related to fungicide...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Application equipments; Agricultural aviation; Fungicides deposits; Phakopsora pachyrhizi.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162011000400008

BLADE ANGLE EFFECT ON DROPLET SIZE SPECTRUM OF ROTARY ATOMIZERS USED IN BRAZIL
Provedor de dados: 70
Autores: Carvalho,Fernando K.; Antuniassi,Ulisses R.; Chechetto,Rodolfo G.; Mota,Alisson A. B.; Kruger,Greg R.
ABSTRACT The effect of blade angle on droplet size spectrum of five rotary cage atomizers and one rotary disc atomizer used in Brazil was evaluated in a high speed wind tunnel, with an air speed of 180 km h−1. This study included the characterization of the droplet size spectrum, via laser diffraction instrument, generated by three blades angles, of 45, 60 and 75 degrees. The spray solution was composed of Picoxystrobin+ Cyproconazole fungicide (SC), at 20 mL c.p. L−1, and at a flow rate of 6 L min−1. As the angle decreased from 75 to 45 degrees, the rotational speed of the atomizers increased and the volume median diameter (VMD) decreased. However, increasing the rotational speed also increased the percentage of droplets smaller than 100 µm (% &lt; 100...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Application technology; Atomization; Spray drift; Pesticides.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000601118

SPECTRUM AND VELOCITY OF DROPLETS OF SPRAY NOZZLES WITH AND WITHOUT AIR INDUCTION
Provedor de dados: 70
Autores: França,Jorge A. L.; Cunha,João P. A. R. da; Antuniassi,Ulisses R.
ABSTRACT The aim of this study was to evaluate the spectrum and the velocity of droplets produced by nozzles with and without air induction, under different pressures and flow rates. The experiment was conducted in a completely randomized design with five replications, in a factorial 2 x 3 x 3 (two spray nozzles, three flow rates and three operating pressures). The spray nozzles with and without air induction of the Hypro manufacturer (GA and VP) were evaluated, with nominal flow rates of 0.76; 1.14 and 1.51 L min-1 and pressures of 200, 300 and 400 kPa. The spectrum and velocity of the droplets were determined directly, using a Visisize Portable P15 (Oxford Lasers, Imaging Division). The pressure increases further reduction of the VMD and the relative...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spray drift; Droplet size; Application technology of pesticides.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000200232

PERFORMANCE OF AIR INDUCTION SPRAY NOZZLE MODELS UNDER DIFFERENT OPERATING CONDITIONS
Provedor de dados: 70
Autores: Cunha,João P. A. R. da; França,Jorge A. L.; Alvarenga,Cleyton B. de; Alves,Guilherme S.; Antuniassi,Ulisses R.
ABSTRACT For the successful application of phytosanitary products, it is essential to understand the spraying process well. The present work aims to evaluate the spectrum and speed of the droplets produced by different spray nozzle models with air induction, working under different operating conditions. The experiment was conducted using an entirely randomized design with five repetitions in a 3 × 3 × 3 factor scheme that incorporates three nozzle models (ADIA, AIXR, and GA), three nominal flows (0.76, 1.14, and 1.51 L min−1), and three operating pressures (200, 300, and 400 kPa). The spectrum and speed of the droplets were determined directly using a real-time droplet analyzer based on high-resolution image analysis. The spray nozzle model interfered with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spray tip; Droplet spectrum; Sprayer; Application technology.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000600711

Periodic inspection of sprayers: diagnostic to the northern of Paraná
Provedor de dados: 70
Autores: Gandolfo,Marco A.; Antuniassi,Ulisses R.; Gandolfo,Ulisses D.; Moraes,Eder D. de; Rodrigues,Eurípedes B.; Adegas,Fernando S.
To optimize the use of pesticides, several countries have carried out periodic inspections in agricultural sprayers. In Brazil, knowing the conditions of this machinery canguide researches and investments in guidelines for its use and maintenance. The objective of this study was to verify the state of sprayer maintenance used in the North of the state of Paraná, in Brazil. Several sprayer items were evaluated, such as: presence, status and scale of the manometer, status of the hose, status of the anti-drip component, presence of leaks, status of the bar, status of the filters, state of the spraying nozzles and errors in the targeted flow rate. Machines were named as approved when there was no failure in any item evaluated. The factor that caused the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Periodic inspection; Sprayer; Quality of application.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000200019

Viabilidade econômica dos sistemas manual e mecanizado de aplicação de herbicidas em ferrovias
Provedor de dados: 87
Autores: Antuniassi,Ulisses R.; Velini,Edivaldo D.; Camposilvan,Daniel.
A aplicação mecanizada de herbicidas em ferrovias tem como principal vantagem a grande capacidade operacional, cobrindo trechos extensos em curtos espaços de tempo. Entretanto em função das características dos equipamentos utilizados, quase sempre ocorre grande desperdício de herbicida. A aplicação manual, através de pulverizadores costais, tem como principal vantagem a possibilidade da pulverização dirigida às áreas infestadas, diminuindo a quantidade de herbicida aplicado. Por outro lado, sua reduzida capacidade operacional faz com que a aplicação de longos trechos seja demorada, tornando-a, assim, mais dependente dos problemas climáticos e operacionais da ferrovia. O objetivo do trabalho foi realizar uma análise comparativa das características...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pulverização; Custos; Área não agrícola.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83581996000100002

Performance evaluation of injection metering systems
Provedor de dados: 91
Autores: Antuniassi,Ulisses R.; Miller,Paul; Paice,Mark.
A method for measuring the performance of agricultural injection metering systems was developed and used to assess the characteristics of three commercial system designs. Steady-state characteristics were measured using both colored dyes and salt as tracers. Dynamic response characteristics were determined by measuring salt concentration downstream of the injection point by monitoring electrical conductivity of the spray solution. Salt added to a viscous test liquid changed viscosity slightly only at low shear rates and it is concluded that this liquid is appropriate for use in evaluation tests with injection systems. Results from tests with 2 systems specifically designed for operation with agricultural sprayers gave a linear response with both water and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Precision agriculture; Sprayers; Pesticides.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662002000100028