Forest Sciences Commons^™

An Ecological Study Of The Upland Conifers Of Itasca State Park, Vernance Beste

Journal of the Minnesota Academy of Science

No abstract provided.

Some Observations In Progeny Tests Of Slash Pine In Georgia, John C. Barber

Journal of the Minnesota Academy of Science

No abstract provided.

Photosynthesis In Aspen Bark During Winter Months, L. C. Pearson, Donald B. Lawrence

Journal of the Minnesota Academy of Science

No abstract provided.

Five-Year Results In An Aspen Sucker Density Study, Rudolph O. Strothmann, Miron L. Heinselman

Aspen Bibliography

No abstract provided.

The Growth And Yield Of Aspen [Populus Tremuloides] In Saskatchewan, C. L. Kirby, W. S. Bailey, J. G. Gilmour

Aspen Bibliography

This report is a summary of all studies carried out by the Saskatchewan Forestry Branch in hardwood stands. Aspen, the principal component of the hardwood stands, is the most abundant tree species by both volume and area in Saskatchewan and is most difficult to analyze. This report presents conclusions from which further studies can be conducted. It is hoped that in the future closer correlation with site-types may be made as it is difficult and probably not desirable to make further generalization on a province-wide basis. However, before detailed questions could be studies it was necessary to have a picture …

Aspen Leaf Blight In The Intermountain Region, James L. Mielke

Aspen Bibliography

No abstract provided.

The Growth And Yield Of Aspen In Saskatchewan, C. L. Kirby, W. S. Bailey, J. G. Gilmour

Aspen Bibliography

No abstract provided.

Field Guide To Aid In Recognition Of Natural Triploid Aspen, Philip N. Joranson, Dean W. Einspahr, J P. Van Buijtenen

Aspen Bibliography

Swedish experience with the genetic improvement of the European aspen (Populus tremula L.), a species which is closely kin to our North American quaking aspen (P. tremuloides Michx.), suggests that the rate of volume increment and the length of fiber tracheids might both be increased in North American aspen by finding or producing trees which possess a triple set, rather than the usual double set, of "chromosomes". Chromosomes (Figure 1) are found within and inner region--the nucleus--of each of the millions of cells formed during the growth of a tree.

Range Liverstock Nutrition And Its Importance In The Intermountain Region, C. Wayne Cook

Faculty Honor Lectures

It has been estimated that about 728 million acres or about 76 percent of the entire land area in the West is used for grazing (Stoddard and Smith 1956). In Utah about 93 percent of the land area or 48,900,000 acres is considered range land (Reuss and Blanch 1951). Although some of this range land is forested, a large area of it can be used only for grazing. Therefore, range livestock production is an important segment of western agriculture.

Before 19'00 most of the animals in the West grazed on the range all year. However, irrigation crop production has expanded …

Bulletin No. 9: Six Points Of Especial Botanical Interest In Connecticut, Richard H. Goodwin, Frank E. Egler, William A. Niering, Charles E. Olmsted, David M. Smith, Henry W. Hicock, Herbert I. Winer, Edward C. Childs

Bulletins

The areas described are the Barn Island Marshes, the Connecticut Arboretum, the North Haven Sand Plains, Catlin Wood, Cathedral Pines and the Bigelow Pond Hemlocks. 32 pp.

The Reclamation Of Fibers From Blueprint Stock, Joseph A. Boyle

Paper Engineering Senior Theses

Object

A method of reclaiming the fibers from blueprint paper after it has been used in the photocopying precess and the subsequent bleaching of these fibers is sought.

A Photographic Study Of The Effects Of Beating On Fiber Structure, Gene D. Anderson

Paper Engineering Senior Theses

Because beating is the most fundamental, but highly important, process in the paper industry, some of the changes in fiber structure that occur during beating have been investigated. A literature survey is also presented concerning a number of related investigations of fiber structure.

The experimental results indicate that fibrillation begins very shortly after the beating process is started. As beating progresses, the primary cell wall is removed, and the specific area of the fiber increases greatly when the watery medium encounters the secondary lamella area of the fiber. Continued beating shows that the action is a mechanical one, in that …

An Investigation Of Nylon Fiber As A Papermaking Material, Robert J. Thiessen

Paper Engineering Senior Theses

Investigations were made to determine whether or not a practical method of bonding nylon-wood blend paper could be devised in which advantage is obtained from the strength qualities of the nylon fibers in the finished sheet. Two unsatisfactory methods were tried before a satisfactory method was found. By this method 25-to 50-per cent nylon content sheets were dipped in a five to ten-per cent solids water emulsion of a polyamide resin. The sheets were then dried, free of surface support, and then heat pressed to complete the bonding. Paper of high strength and durability was thus produced.

A Comparison Of Sheffield Instruments For Smoothness And Porosity With Others Now Used, John B. Yonker

Paper Engineering Senior Theses

This report shows that there is a correlation between Bekk and Sheffield smoothness and between Gurley and Sheffield porosity. The correlation is not as good in the upper Bekk smoothness range or in the upper Gurley range.

A Survey Of The Effect Of Mineral Salts On Direct Dyeings, Lawrence R. Bortolotti

Paper Engineering Senior Theses

A study of the effect of various minerals salts on dyeings made with direct dyes. Dyes were chosen for their frequency of usage in the paper industry; the salts were chosen for several reasons, the prime one being that they form a floc at approximately the same pH as that of the stock run over the paper machine, also for its cost and availability. Sheets were made with the various dyes and salts in severals percentages of each dried, out up into test sheets for fading and bleeding. The test sheets were examined visually for evidence of fading and bleeding …

Impartial Evaluations Of The Printing Quality Of Paper, Warren R. Engel

Paper Engineering Senior Theses

Several methods for the evaluation of paper have been investigated for their desirability as means of an impartial evaluation of the printing quality of paper. The halftone plate method showed the most desired results as an impartial evaluation of both coated and uncoated papers. The printing gage was not found to be a satisfactory method of evaluation. The drawdown method is especially significant in evaluating properties which influence the printing quality but lacks a suitable numerical evaluation.

A Basis For Forest Tree Seed Collection Zones In The Lake States, Paul O. Rudolf

Journal of the Minnesota Academy of Science

No abstract provided.

Maine Forester: 1956, University Of Maine. School Of Forestry Resources.

Forester Yearbooks

Page 3, Dedication
Page 5, Staff and Acknowledgments
Page 6, The Editors' Page
Articles
Page 8, The Fisher Comes Back
Page 16, Range Management in the Forestry Curriculum
Page 20, University of Maine and State of Maine Fishery Management
Page 23, Recent Advances in Forest and Wildlife Photogrammetry
Page 28, Let Us Not Forget
Activities
Page 32, Xi Sigma Pi
Page 33, The Clubhouse
Page 34, Woodsman's Weekend 1955
Page 35, Forestry Goes to a Fair
Page 36, Freshman Forestry Camp
Page 38, Ecologically Speaking
Page 41, Tales of Summer Camp 1955
Classes
Page 45, The Faculty
Page 48, Class …

Foliage Symptoms As Indicators Of Potassium-Deficient Soils, Laurence C. Walker

Faculty Publications

No abstract provided.

Some Factors Which Influence The Rigidity And Durability Of Waxed Paperboard Cartons For Packaging Liquid Food Products, R. Nitz

Paper Engineering Senior Theses

Introduction

A. Paperboard

There are many types of heavy papers and paperboards manufactured today from various pulps. The paperboard which has grown the fastest in consumption in the past ten years is that intended for packaging foods. ⁽¹⁾ The most common food board is that manufactured on either a cylinder or fourdrinier machine, is nearly all consumed by manufacturers of varied milk cartons, and fruit juice cartons. These cartons are fabricated from the afore mentioned paperboard for many reasons.

Determination Of Percentage Of Polyethylene In Paper, James Alan Lawson

Paper Engineering Senior Theses

The purpose of this this thesis was the development of a quantitative test for polyethylene in paper. A review of the literature discloses that no published method exists; however valuable information was obtained, which directed the planning of the experimental work. A method was developed for the determination of polyethylene in paper. This method involves the extraction of paper in a Soxhlet extractor with CCl_4. The extract is evaporated to near dryness. The residue, containing polyethylene and waxes, is than extracted with diethyl ether to remove the waxes. The results of this method show that it is accurate on …

Bulletin No. 8: The Mamacoke Acquisition And Our Research Program, Richard H. Goodwin, William A. Niering

Bulletins

No abstract provided.

Measurement Of The Degree Of Cellulose Degradation Caused By Fungi, Ronald C. Morgan

Paper Engineering Senior Theses

The objective of this thesis is to obtain a method for determining the degree of cellulose degradation, caused by fungal attack, using testing methods commen to the paper industry rather than complex biochemical testing procedures.

Supercalender Variables (Iii) The Effects Of Static Pressure And Rolling Pressure On Paper, Donald V. Martin

Paper Engineering Senior Theses

This thesis is the third in a series of fundamental investigations of the variables of supercalendering. The variables studied in this thesis are the internal effects derived from rolling pressure and of static pressure on paper. These variables were investigated by testing four grades of paper after being subjected to supercalendering and comparing them with similar grades pressed by a hydraulic press. The experimental results show that a definite comparative trend in the internal effects of paper were established between the rolling pressure caused by supercalendering and static pressure given by a hydraulic press. The physical properties tested were Mullen, …

The Bonding Of Felted Glass Fibers By The Use Of Ordinary Papermakers' Wet-Strength Resins, Kenneth C. Rasmussen

Paper Engineering Senior Theses

Papermakers' wet-strength resins have been added to felted glass fibers as to increase the strength of the fibers.

On the basis that a stronger sheet of paper made from glass fibers could be put to many uses, experiments were of two types. First, an excess of wet-strength resins were added to the fibers. Second, handsheets made of one hundred per-cent glass fibers were dipped into a two per-cent resin tub-sizing solution.

Favorable results were obtained in both cases.

The Effect Of Various Deinking Solutions And Concentrations Upon The Strength Of Fiber, Leonard J. Timmer

Paper Engineering Senior Theses

Preliminary investigation produced limited information on the effect of various deinking solutions and concentrations upon the strength of fiber. Experimentation indicated that deinking does have a destructive effect upon the strength of fiber. This effect correlates to the temperature and the amount of chemical used. Also indicated is the fact that a mixture of Sodium hydroxide and Sodium carbonate has less of a destructive effect than either of these alone.

Separation Of Carbon From Deinking Waste By Means Of Flotation, Lester R. Beeman

Paper Engineering Senior Theses

The technique of froth flotation, as practiced in the separation of mineral ores, has been applied to the separation of carbon black from the deinking waste of the paper industry.

On the theory that carbon black (from ink) has a positive charge in water, and clay and cellulose fibers have negative charges in water, experiments were of two types. First, it was attempted to float the carbon from the clay and cellulose fibers. Second, it was attempted to float the clay and cellulose fibers from the carbon.

Several possible formulas were found for separating carbon black from deinking waste. Favorable …

Site Identification For Bigtooth Aspen Sucker Stands, S.A. Graham, R.P. Harrison

Aspen Bibliography

Bigtooth aspen (Populus grandidentata) is an upland species that reaches its best development on relatively moist, loamy and sandy soils. Following logging of this tree, reproduction is almost invariably by root suckers which, in clear-cuttings, appear in profusion. Because these suckers are supported by the fully developed root systems of the parent trees, they grow at an almost unbelievably rapid rate on both good and poor sites. As a result it is impossible to recognize site quality from their growth rate alone. For this reason other indicators of site are needed in order to judge the potentialities of …

Seeds In The Forest Floor Of The Ponderosa Pine Type, James T. Krygier

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Regeneration of forest stands is often complicated by the establishment and competition of brush on logged and burned-over areas. The encroachment of brush in the ponderosa pine type of Idaho, particularly Ceanothus velutinus, Dougl. presents a difficult problem to the forest manager. The brush competition severely reduces the growth rate of associated trees, thus extending the period necessary to grow a crop of trees. This situation may seriously limit the economic production of a wood crop of ponderosa pine.

Optimization Of A Kraft Pulp Dioxirane Bleaching Stage, Eric A. Thompson

Paper Engineering Senior Theses

This research characterized and optimized the bleaching potential of dimethyldioxirane (DMD) on an -oxygen-delignified hardwood kraft pulp. The DMD wash produced in-situ using a caroate (2KHSO₅^.KHSO₄^.K₂ SO₄) acetone under controlled conditions. The studied variables included chemical concentration, consistency, temperature, reaction time, and chelation. Statistically designed experiments with response surface, methodology were used - to help locate the optimum conditions with respect to pulp brightness and strength. These conditions were located at 2.8% AO (activated-oxygen charge), 5.5% consistency, and 55^° C.

It was found that over 95% of the total brightness …