Life Sciences Commons^™

A Survey Of Management Opinions Of Noise In The Pulp And Paper Industry, Carola Trittin

Masters Theses

Introduction

The pulp and paper industry is the fifth largest in the United States, dollar-wise, and is also the third fastest growing industry in the United States (1). There are between 375,000 and 400,000 people employed directly in the pulp and paper mills in the United States and Canada. A nation-wide survey on the importance of noise in this industry is needed to help clarify the effects, if any, that noise has upon its employees.

By definition, noise is non-harmonious sound. When the subject of noise is mentioned, many suggestions are given on places where such a study should be …

The Effects Of Woodpeckers On Populations Of The Engelmann Spruce Beetle, F B. Knight

The Bark Beetles, Fuels, and Fire Bibliography

Woodpeckers have been recognized for many years as a major factor in the natural reduction of Engelmann spruce beetle populations. A means of assessing their value has been developed. Five classifications of woodpecker feeding based on woodpecker work on 225 trees were studies. An analysis of populations measurements showed a correlation between beetle survival and the woodpecker classification and the intensity of infestation in each tree. A heavy woodpecker classification resulted n very little survival at all intensities of infestation. Survival increased both with an increase in intensity of infestation and a lower woodpecker classification. The average reduction in populations …

Variation In Tracheid Length And Wood Density In Geographic Races Of Scotch Pine, Robert M. Echols

Yale School of the Environment Bulletin Series

No abstract provided.

Silvical Characteristics Of Bigtooth Aspen [Populas Grandidentata], P.E. Slabaugh

Aspen Bibliography

No abstract provided.

Photosynthesis In Aspen Bark, L.C. Pearson, D.B. Lawrence

Aspen Bibliography

No abstract provided.

The Sfa Economist Vol. 2 No. 1, Nelson T. Samson, L. W. Ellerbrook

SFA Economist, 1956-1960

No abstract provided.

The Influence Of Clay Flocculation And Dispersion On The Covering Power Of Clay Coating Colors, Donald G. Pryor

Paper Engineering Senior Theses

Historical Survey

Introduction

A survey of the literature showed that considerable information has been published on the effects of dispersing agents on the viscosity of coating colors and clay slurries. There seemed to be little work done on the effect of the dispersing agent on any other of the properties of the coating.

The Evaluation Of The Printability Of Papers By The I.G.T. Method, Robert W. Shaw

Paper Engineering Senior Theses

Introduction

The purpose of this investigation was to determine to what extent the I.G.T. Tester could be used to determine the printability of paper. The investigation was carried out along two related paths. First to determine if the I.G.T. Tester could be used to give indications of actual press printability and secondly to determine if the results of the I.G.T. Tester were reproducible.

Some Effects In Chlorine Dioxide Purification Of Kraft Softwood Cellulose, Maynard C. Nieboer

Paper Engineering Senior Theses

Introduction

Up until the middle thirties, chlorine dioxide had been considered an expensive bleaching agent and also had been too explosive to ship as a gas, so it had remained a laboratory curiosity since its discovery in the 19th century. In the middle thirties, Mathieson Chemical Corporation found that solid sodium chlorite was a cheap and effective carrier of chlorine dioxide. This discovery opened the door for extensive use of chlorine dioxide and since then it has come into its own as a bleaching agent. This investigation is concerned with the three methods of generation of chlorine dioxide from sodium …

The Influence Of Hexamethylenetetramine And Formaldehyde On The Rheological Behavior Of Casein Base Coating Colors, Chester W. Faram

Paper Engineering Senior Theses

The experimental work presented in this thesis shows the effects of formaldehyde and hexamethylenetetramine on the flow characteristics of coating colors formulated with casein as an adhesive. All experiments were performed at room temperature.

In general, the pH has marked effect upon viscosity of the coating colors: the higher the pH value, the more viscous the coating color. Furthermore, formaldehyde reacted faster with proteinaceous coating colors than hexamine.

Specifically, coating colors containing four per cent hexamine showed little change in viscosity and flow behavior while coating colors at the neutral pH value of seven containing eight per cent hexamine showed …

Synthetic Polymers In Coating Colors: The Adhesive Values Of Lattices And Their Effects On Properties Of Laboratory Coated Papers, Shwang Hsia

Paper Engineering Senior Theses

Five synthetic latices have been evaluated as to their adhesive values and influence on optical properties of the coated papers.

The five synthetic polymers were acrylates, acrylonitrile-buta-diene, polyethylene, polystyrene-butadiene, and vinyl acetate.

The latices were used to substitute, on a pound per pound basis, 25, 50 and 75 percent of the casein used as binder in a standard coating color consisting of 100 parts of coating clay and 16 parts of casein.

Higher adhesive values than that of straight casein were established by acrylates and two butadiene copolymers. Vinyl acetate and polyethylene possessed lower adhesive values than straight casein color. …

The Comparison Of High And Low Shear Viscometers For Determining Rheological Characteristics In Pigmented Coatings, Philip J. Meyer

Paper Engineering Senior Theses

Introduction

The purpose of this investigation was to determine if there was any relationship between the rheograms of the Hercules High Shear Viscometer and the Stormer Low Shear Viscometer when applied to paper pigmented coatings.

Pigmented Coating On Unbleached Paper, Robert I-Ching Yin

Paper Engineering Senior Theses

Much work has been done generally on the coating of paper, but very little literature is available on the coating of unbleached paper or unbleached book stock. Therefore, the covering power of the coating in this study is of the chief interest.

Bleaching Of Kraft Pulp By Means Of Hydrogen Peroxide. The Effect Of Acid Treatment And Calcium Chloride Treatment Before The Last Stage, William J. Haselow

Paper Engineering Senior Theses

From the results of the experimental work conducted, it appears that hydrochloric acid pretreatment of chlorinated and caustic extracted, and, also, chlorinated, caustic extracted, and calcium hypochlorite bleached kraft pulp before last stage hydrogen peroxide bleaching was not beneficial to final brightness.

Calcium chloride pretreatment, on the other hand, was definitely of value to final brightness in three stage bleaching. However, calcium chloride pretreatment of chlorinated, caustic extracted, and calcium hypochlorite bleached kraft pulp did not increase pulp brightness to a significant extent.

It seems, therefore, that there was an optimum concentration of calcium salts which was of maximum benefit …

The Effect Of Galacto-Mannans On Handsheets Made From Softwood, Hardwood Or Rag Pulps, Thomas R. Murwin

Paper Engineering Senior Theses

Some published information reports that galacto-mannans, when used as strength producing beater additives, do not effect significant strength increases in hardwood pulps. In order to investigate this problem further, six pulps covering a wide range of pulping processes and chemical compositions, were evaluated before and after the addition of locust bean gum, a galacto-mannan, to the pulp.

The results obtained indicate that galacto-mannans do favorably affect the strength properties of hardwood pulps. Substantial increases in bursting strength, tensile strength and folding endurance were noted for all the hardwood pulps employed, as well as for a rag pulp. These strength increases …

Forestry Bulletin No. 2: Directory Of Wood-Using And Related Industries In East Texas, N. T. Samson

Forestry Bulletins No. 1-25, 1957-1972

A directory of wood using industries by East Texas Counties.

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

Aspen Bibliography

No abstract provided.

Forestry Bulletin No. 1: Reference Of Values In Studies Affecting The Southern Pines, An Annotated List, R C. Thatcher

Forestry Bulletins No. 1-25, 1957-1972

Annotated bibliography of works coving studies of insects affecting the southern pines.

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.

Some Further Evidence Of Competition Between Loblolly Pine And Associated Hardwoods, C.F. Korstian, M. Victor Bilan

Faculty Publications

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.

Effect Of Environment On The Percentage Of Summerwood And Specific Gravity Of Slash Pine, Philip R. Larson

Yale School of the Environment Bulletin Series

No abstract provided.

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.