Life Sciences Commons^™

The Effect Of Anthraquinone In The Kraft Pulping Process, Carl W. Stoll

Paper Engineering Senior Theses

Due to current attitudes arid regulations concerning the odorous emission of mercaptans from the Kraft pulping process, new technology must be developed to enable the process to be run at lower sulfide levels. The use of cyclic-keto compounds, as pulping catalyst, could be a major step in the reduction of sulfide levels in Kraft pulping, while acting to increase the pulping yield through a mechanism that stabilizes the carbohydrates during the process and catalyzes delignification.

The objective of this research project is to evaluate the performance of one cyclic keto compound that has recently received the attention of many researchers …

The Association Of Seed And Cone Predator Populations And Cone Crop Production In Engelmann Spruce, Dawn E. Cameron

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Engelmann spruce (Picea engelmannii Parry ex Engelm.) exhibits cone crop periodicity, producing seed in a cyclic pattern. Variation in seed production has been noted between individuals of a population, but synchronization on a large scale is common. The theory that ultimately these periodic large cone crops have resulted from the selective pressures of seed and cone predators, referred to as the predator satiation hypothesis, is considered. Assuming predator pressures have operated over evolutionary time to select for periodic synchrony, associations between seed and cone predators and cone crop production levels were anticipated. These potential consequences of predator satiation were …

The Application Of Chitosan To Composite Boxboard For Plybond Development, Tracy O. Drier

Paper Engineering Senior Theses

The area of study during this research was the effect of the marine polymer chitosan addition rate on strength properties, and retention characteristics. Two machine trials were run on the WMU twin ply former using old corrugated container (O.C.C.).

Machine run # 1 consisted of running a 1% chitosan solution at 0, 6, 16, 18#/ton. Run # 2 also used a 1% chitosan solution but lower addition rates of 0, 2, 5#/ton. The chitosan was added to the thick stock prior to the fan pump for both runs. No comparisons between the runs were made.

Conclusions from both runs include: …

The Effect Of Film Forming Agents In A Size Solution On Silicone Holdout, Michael D. Stang

Paper Engineering Senior Theses

In the production c>f base papers for silicone coating, one of the most important variables is the holdout capability of the ' base sheet. The holdout is primarily affected by the surface characteristics of the sheet relating to the smoothness and surface structure.

An experiment was designed to look at the effects of several different commercial film forming agents in a standard size solution on the holdout properties of the sheet. A laboratory size press coater was assembled and used for application of the size solutions. After supercalendering, the sheets were silicone coated with an aqueous silicone solution and …

A Woody Understory Survey Of Baber Woods, Edgar County, Illinois, Jacqueline M. Spencer

Masters Theses

The understory of Baber Woods, located in Edgar County, Illinois, was surveyed to see if sugar maple had increased enough in importance to consider implementing some type of forest management technique. Five 100 meter transects were randomly located in closed canopy areas throughout the woods. Specimens were removed from continuous 1 meter quadrats located along each line. Specimens were also removed from twenty 25 meter transects located in the open canopy areas. Species, age, height, diameter, and quadrat number were recorded for each specimen. The data was analyzed for age-height and age-diameter relationships, plus individuals per hectare, density, frequency, relative …