"Thesis presented to the Cornell University for the degree of master of science." verso of t.p.

Thesis (M.S.)--Wisconsin. / Includes bibliographical references (leaves 86-89).

Thesis (Ph. D.)--University of Wisconsin--Madison, 1963. / Typescript. Includes abstract and vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 435-451).

Thesis (M.S.)--University of Wisconsin--Madison, 1962. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaf 101).

Thesis (Ph. D.)--University of Wisconsin--Madison, 1981. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 199-201).

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

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.

Extensive research efforts are underway to generate composite coatings including carbon nanotubes (CNT) in order to improve the properties of the bulk coat. The present project concentrates on possible methods that would allow the plasma spraying of CNT-based nano-composite coatings. Various methods for producing metal-CNT composite powders for thermal plasma spraying are studied in this project. The first method discussed is based on CNT dispersion followed by an agglomeration procedure using a polymer binder. The second and more promising technique gets around the problems associated with handling, separating, and transporting the nanotubes to the substrate through a direct synthesis of the CNT on the particles to be sprayed. In the present context, this synthesis is made on pretreated stainless steel SS304 powders by chemical vapor deposition (CVD). A parametric study is made for the various steps of the thermal CVD process by varying parameters such as the etching time in the pre-treatment sequence, while the reaction temperature, the annealing temperature, the growth phase duration and the acetylene injection time are varied for the CVD sequence. The composite powders are analyzed using high resolution electron microscopy images (FEGSEM), thermogravimetric analyses (TGA), Raman spectroscopy, and BET surface area analyses. This study provided the parametric optimization of the thermal CVD procedure with respect to CNT production. The composite powders generated show a dense, fully covered, and uniform CNT forest with a purity of CNT to amorphous carbon of 86% based on the micro-Raman spectra obtained.

No description available.

The main scope of this work was to investigate whether it is possible to produce free standing 3D structures by the means of spraying and using MFC as raw material. This was carried out by diluting MFC into a consistency of 2% and spraying it onto a male mould. During the trials, several different devices and procedures were investigated in order to find a possible solution. The results from the laboratory trials showed that it is possible to create trays of MFC that could suitable as a detail for packaging. The important thing was to pre-heat the mould before spraying, build the tray in layers, where spraying should be carried out in a 45° angle, with single sweeps while rotating the mould in the beginning of the process, and to use a drying method, were the drying could be focused on the wet parts at the same time as it could avoid those who already had been dried, to dry the sample between each layer of MFC until the wet surface disappeared. Exactly how many sweeps per layer that should be sprayed after the first drying does not matter much, the important thing was that the layers do not become too thick. Because then, too much moisture was trapped inside the samples which made them burst during the drying.