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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

The role of droplet size, concentration, spray volume, and canopy architecture in herbicide application efficiency /

Richardson, Brian. January 1988 (has links)
Thesis (Ph. D.)--Oregon State University, 1989. / Typescript (photocopy). Includes bibliographical references. Also available on the World Wide Web.
2

Inverted spray mixtures, and their development with reference to coddling moth control.

Marshall, James. January 1938 (has links)
No description available.
3

A standard method for testing rotary airborne spray devices /

Heath, Douglas Bradley. January 1985 (has links) (PDF)
Thesis (M. Ag. Sc.)--University of Adelaide, 1985. / Some mounted ill. Includes bibliographical references (leaves 74-75).
4

Spray nozzle distribution analysis with computerized electronic weighing /

Thornton, Eric A. (Eric Allen), January 1986 (has links)
Thesis (M.S.)--Ohio State University, 1986. / Includes bibliographical references (leaf 149). Available online via OhioLINK's ETD Center
5

The effect of certain spray materials on the transpiration of strawberry and apple foliage

Ackley, William Benton. January 1947 (has links)
LD2668 .T4 1947 A2 / Master of Science
6

A comparison of drift from hooded and open-boom agricultural sprayers

Fehringer, Ronald J. 10 September 1990 (has links)
A recent development in drift-control for agricultural ground sprayers is the installation of a hood (or shroud) over the boom. Hoods are designed to provide a protected zone in which droplets can be sprayed and deposited on the target with limited interference from the wind. This study compared chemical drift using hooded and open-boom pesticide sprayers in various configurations. The hooded sprayer included an air-foil mounted on top of the hood, designed to re-direct the airflow and further decrease drift. The principal objective was to test the performance of the hood, the air-foil, and nozzle size in reducing drift. A fluorescent dye and water solution was sprayed adjacent to a series of parallel string collectors. The amount of drifting material was determined by rinsing the string and testing the fluorescence of the rinsewater. Wind speed and direction, temperature, and relative humidity were monitored during each field test so that the influence of weather conditions on drift could be assessed. Statistical and graphical comparisons were based on the development of a regression model to describe downwind drift for each sprayer configuration under a set of variable weather conditions. Only parameters found to be important to drift were included in the final model. These parameters included sprayer configuration, wind speed, temperature, and the interactions of configuration with wind speed and temperature. Results of the comparisons indicated that for a larger droplet spectrum, the hood reduced drift significantly, while for smaller droplets the hood was ineffective. The air-foil was found to have no influence on drift. / Graduation date: 1991
7

When You Buy or Build a Field Sprayer

Akesson, Norman B., Curley, Robert G., Yates, W. E. 02 1900 (has links)
This item was digitized as part of the Million Books Project led by Carnegie Mellon University and supported by grants from the National Science Foundation (NSF). Cornell University coordinated the participation of land-grant and agricultural libraries in providing historical agricultural information for the digitization project; the University of Arizona Libraries, the College of Agriculture and Life Sciences, and the Office of Arid Lands Studies collaborated in the selection and provision of material for the digitization project.
8

'n Ondersoek na die aard, omvang en beheer van voëlskade by druiwe van verskillende wyndruifkultivars in die streek Stellenbosch-Simonsberg

Le Riche, E. 12 1900 (has links)
Thesis (MSc)--Stellenbosch University, 1981. / ENGLISH ABSTRACT: No abstract available / AFRIKAANSE OPSOMMING: Die aard, omvang en beheer van voelskade by wyndruiwe is ondersoek in die streek Stellenbosch - Simonsberg. Die Mossie (Passer melanurus, Willer) en die Europese spreeu (Sturnus vulgaris, Linnaeus) veroorsaak die meeste voelskade aan.wyndruiwe in die streek. Die kultivars gebruik in die ondersoek Was Chenin blanc, Pint noir, Riesling, Cinsaut, Clairette blanche en Cabernet Sauvignon. Die laagste suiker- en tic.ogsbasuurgehaltes waarby voelskade voorgehom het was onderskeidelik 11,2° Balling en 25,9g per l,- terwyl vreetskade by gemiddelde 12,4°. Balling en 19,1 g per l totale suur begin het. Die belangrikste enkele faktor wat t rol gespeel het by beskadiging was die suikerkonsentrasie. Die patroon van vreetskade oor t wingerdry is bepaal en het getoon dat die eerste 30 stokke aan weerskante van die wingerd die meeste beskadig word. 'n Metode is vasgestel cm die hoeveelheid skade aangerig te bepaal met behulp van tellings van beskadigde korrels in verteenwoordigende wingerdrye. Die skade in die streek is op 2,5% van die totale opbrengs per hektaar bepaal. Die bespuiting van wingerdblokke en alternatiewe buffer-kantrye met die afskrikmiddel metiokarb (Mesurol) teen 'n konsentrasie van 0,1% or genoemde kultivars, asook Muskadel, het onvoldoende beheer gebied. Bespuitings teen hoer konsentrasies word aanbeveel.
9

Velocidade das gotas geradas por pontas de jato plano de faixa ampliada em função da tensão superficial e da viscosidade da calda /

Panini, Rafael Luiz. January 2019 (has links)
Orientador: Ulisses Rocha Antuniassi / Banca: Kléber Pereira Lanças / Banca: Rone Batista de Oliveira / Resumo: O objetivo do presente trabalho foi determinar a velocidade das gotas geradas por uma ponta de jato plano de faixa ampliada (XR11003) em função de variações na tensão superficial e da viscosidade de caldas compostas por diluições de um surfactante e um óleo vegetal. Os adjuvantes utilizados foram o surfactante Agral e o óleo vegetal Natur'óleo, além de uma calda padrão (testemunha) composta apenas por água. Os ensaios foram conduzidos em delineamento inteiramente casualizado com 5 repetições. Para isso foram determinadas as viscosidades e tensão superficial para diferentes concentrações dos adjuvantes, bem como velocidade de gotas. As caldas pulverizadas foram amostradas em condições operacionais idênticas de pressão (2,8 bar), buscando a quantificação das velocidades de forma homogênea, em diferentes diâmetros de gota: 50, 100, 150, 200, 250, 300 e 350 µm. Os experimentos foram conduzidos para coleta na altura de pulverização de 30 cm em relação ao analisador de partículas em tempo real VisiSize Portable (Oxford Lasers Ltd / UK). Foram ajustados modelos para os dados de velocidade e tamanho de gotas, viscosidade e tensão superficial, assim como realizou-se a Análise de Variância para significância do modelo e o coeficiente de determinação múltipla. A análise de correlação foi empregada para verificar o efeito da viscosidade e tensão superficial sobre a velocidade de gotas. Os resultados mostraram que os modelos tridimensionais indicam a formação de gradiente ascendente da ve... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: The objective of the present work was to determine the velocity of the droplets generated by a wide band plane jet (XR11003) as a function of variations in surface tension and viscosity of syrups composed of dilutions of a surfactant and vegetable oil. The adjuvants used were the Agral surfactant and the Natur'óleo vegetable oil, besides a standard syringe (control) composed only of water. The trials were conducted in a completely randomized design with 5 replicates. For this, the viscosities and surface tension were determined for different concentrations of the adjuvants, as well as droplet velocity. The pulverized samples were sampled under identical operating pressure conditions (2.8 bar), aiming at the quantification of the homogeneous velocities in different drop diameters: 50, 100, 150, 200, 250, 300 and 350 μm. The experiments were conducted at the 30 cm spray height in relation to the VisiSize Portable (Oxford Lasers Ltd / UK) real-time particle analyzer. Models for the velocity and droplet size, viscosity and surface tension data were adjusted, as well as the Analysis of Variance for model significance and the multiple determination coefficient. Correlation analysis was used to verify the effect of viscosity and surface tension on the droplet velocity. The results showed that the three-dimensional models indicate the formation of an upward velocity gradient as a function of viscosity, that is, a trend of higher velocities was observed for higher viscosity values. The inverse occurred for surface tension (downward velocity gradient as a function of surface tension), that is, a trend of lower velocities was observed for higher values of surface tension. However, no significant correlations were observed between surface tension or viscosity and velocities for each droplet size (p> 0.05). It is concluded, therefore, that for the spray tip XR 11003 at a pressure of 2.8 bar, the droplet ... / Mestre
10

Design and feasibility of a permanent system for pesticide application in orchards /

Wilson, Steven M. January 1983 (has links)
Thesis (M.S.)--Ohio State University. / Includes bibliographical references (leaves 63-65). Available online via OhioLINK's ETD Center

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