Thesis (Ph. D.)--University of Wisconsin--Madison, 1955. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 65-72).

Thesis (Ph. D.)--Oregon State University, 2001. / Typescript (photocopy). Includes bibliographical references. Also available on the World Wide Web.

Thesis (Ph. D.)--West Virginia University, 2010. / Title from document title page. Document formatted into pages; contains viii, 98 p. : ill. (some col.), col. map. Includes abstract. Includes bibliographical references.

Thesis (M.S.)--University of Wisconsin--Madison, 1982. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 133-134).

It has been indicated through a review of the literature that wood by-products have a potential as a dietary source of energy for the ruminant animal. However, lignin constitutes a barrier to the proper utilization of cellulose. Generally, any treatment to remove or alter lignin makes the cellulose within lignocellulose materials more susceptible to the activity of the cellulolytic enzymes. Therefore, an efficient biological treatment would require a system to solubilize or to remove lignin from the lignin-carbohydrate complex. Cellulose within ruminant feeds forms an effective substrate for eventual conversion to body protein. There are several methods available for delignification. This study was carried out using the thermophilic aerobic oxidation method for which swine manure was used both as the source inocula and initial culture media. In the process of degradation, a part of the energy produced was utilized by the bacteria for cell function and multiplication. The remainder of the available energy was released as heat energy. In this method the heat necessary to maintain the temperature in the thermophilic range was derived from both mechanical and from microbial activity. Thermophilic activity is considered to reduce the time required for organic waste digestion over that experienced by mesophilic digestion. The rate of the destruction of pathogenic bacteria, virus and other organisms is increased as a result of the high temperatures fermentation. Batch studies conducted to delignify alder sawdust by the use of the aerobic thermophilic oxidation method demonstrated that the lignin content of sawdust can be reduced by as much as 74%, and crude bacterial protein was generated by approximately 17%. Constant supply of small amounts of swine manure ensures high temperature maintenance. Periodical addition of 2 kg sawdust within thermophilic temperature range results in better delignification. / Land and Food Systems, Faculty of / Graduate

No description available.

An annular control valve was developed for the extrusion of wood slurries and polymers. The objective was to determine the optimal valve geometry: (1) to provide a linear pressure drop across the valve as a function of valve opening and (2) to eliminate the problem of valve plugging caused by the high solid content of the wood slurries. The approach was to model the non-Newtonian flow in a plasticating single-screw extruder. A finite-difference scheme was developed to model the flow through annular surfaces. The two flow equations were solved simultaneously and a parametric study was performed to determine the optimal valve geometry. The valve operability was evaluated for the extrusion of various mixtures of low-density polyethylene, sawdust, wood flour, and vacuum bottom. The experimental results were in good agreement with the model. In general, a linear valve characteristic was observed and the problem of valve plugging was not evident.

No description available.

Thesis (MS)--University of Montana, 2009. / Title from author supplied metadata. Includes bibliographical references.

published_or_final_version / Architecture / Master / Master of Landscape Architecture