Digital Commons Network^™

การผลิตบล็อกปูถนนราคาถูกโดยใช้ขี้เถ้าลอยแม่เมาะ, บุรฉัตร ฉัตรวีระ, พิชัย นิมิตยงสกุล, สุกัญญา นุตาลัย

Applied Environmental Research

No abstract provided.

การคัดเลือกพันธุ์สาหร่ายมาตรฐานเพื่อการทดสอบความทนทานของสี สารเคลือบผิว และวัสดุที่เกี่ยวข้อง, นิชนันท์ ทัดแก้ว, อาภารัตน์ มหาขันธ์, พวงเพ็ญ สูยะนันทน์, ณัฐพร พันธุมนาวิน

Applied Environmental Research

No abstract provided.

Mechanical And Chemical Weathering Of Periglacial And Non-Periglacial Forms On The Eastern Fosheim Peninsula, Ellesmere Island (Northwest Territories), Cameron Lawrence Chadwick

Theses and Dissertations (Comprehensive)

The purpose of this study is to examine the differences in the mechanical and chemical weathering of different periglacial and non-periglacial forms on the eastern Fosheim Peninsula. Forms studied include: solifluction lobes, non-sorted stripes, polygons, mudboils, wetted sloped, dry ridge and wet meadow. Most sites including the periglacial forms of solifluction lobes, non-sorted stripes, and polygons show signs of chemical and mechanical weathering. The weathering found at all sites was minute but may be significant given the slow rates of weathering in this environment. The individual environmental variables of moisture and temperature levels do not appear to have a direct …

Socio-Economic Factors And The Journey To Work: A Case Study Of At&T Gis Employees, Thomas A. Hammers

Theses and Dissertations (Comprehensive)

Individuals who must commute to work are often concerned with the spatial separation of their home and job site. In many of these cases the socio-economic characteristics of these individual's lives play an important part in deciding how long this commute is, in terms of both time and distance. The following study seeks to identify the relationships between several selected socio-economic characteristics and the journey to work distances for employees at AT&T GIS. The factors being examined in this study are age, education level, number of dependents, income, length of service to the company, occupation type and gender. Significant differences …

Relative Rates Of Sand Transport Through An Incipient Parabolic Dune At Pinery Provincial Park, Ontario (Ammophila Breviligulata, Calamovilfa Longifolia, Cakile Edentula, Juniperus Virginiana, Populus Deltoides), Sheri A. Longboat

Theses and Dissertations (Comprehensive)

Factors controlling the development, migration, and stability of an incipient parabolic dune in Pinery Provincial Park, Ontario were investigated in terms of grain size characteristics, rates of sediment transport, and local and regional winds. The parabolic dune, situated approximately 60 meters inland of Lake Huron, is dominated by sparsely scattered dune grass species of marram grass (Ammophila breviligulata), sand reed (Calamovilfa longifolia), and sea rocket (Cakile edentula). Small tree species of red cedar (Juniperus virginiana) and eastern cottonwood (Populus deltoides) emerge and increase in number beyond the parabolic dune. Mean grain sizes along a profile were coarsest on the beach …

Using Digital Elevation Models To Measure The Surface And Volumetric Change Of Athabasca Glacier, Alberta, Canada, 1919-1979, James Robb Reynolds

Theses and Dissertations (Comprehensive)

The Athabasca Glacier (52˚12'N, 117˚14'W) located at the Alberta-British Columbia border was studied to quantify its volumetric, area and elevation changes below 2400 m between 1919 and 1979. The data sources consist of maps produced using aerial and terrestrial photogrammetry in the years between 1919 and 1979. The maps were digitized and converted into raster digital elevation models (DEMs), the manipulation of which allowed values of surface and volumetric change to be calculated. These DEMs showed that between 1919 and 1979 the glacier lost 2.344 x 108m3 of volume and receded more than 1 km. Each of the source maps …

Higher-Order, Multiplicatively Weighted Voronoi Diagrams: A New Approach To Trade Area Analysis, Robert William South

Theses and Dissertations (Comprehensive)

Trade area models have traditionally been classified into one of two groups: spatial monopoly models or market penetration approaches. Spatial monopoly models define trade areas in a deterministic manner, while market penetration models construct market areas that are probabilistic. Past research has grouped Voronoi diagram models exclusively with the spatial monopoly approach. However, the research contained within this thesis demonstrates that Voronoi diagrams can be used to generate trade areas that are consistent with market penetration models. This thesis introduces two new Voronoi diagrams: the order-k, multiplicatively weighted Voronoi diagram (OKMWVD) and the ordered order-k, multiplicatively weighted Voronoi diagram (OOKMWVD). …

Energy And Deforestation In Ghana: A Study Of Woodfuel-Deforestation Links In Rural Ghana, Iddrisu Adam

Theses and Dissertations (Comprehensive)

Forests are one of the most valuable natural resources of many countries, including Ghana. Timber and other forest products have contributed immensely to the development of the country. These same forests have been a source of sustenance to the Ghanian people. Most particularly, forests have been the principal source of domestic energy by way of providing woodfuels. The heavy reliance on forest resources is taking its toll on the health of Ghanaian forests. In recent years, there has been increased awareness of the depletion of trees—a problem that many researchers have attributed to the over-exploitation of forests especially for domestic …

Obstetrical Care In The Baffin Region, Northwest Territories: Geographical, Medical And Cultural Perspectives, Christine Clara Earnshaw

Theses and Dissertations (Comprehensive)

In the Baffin Region, and other regions of the Canadian Arctic, geographic impediments and the history of southern-based health care delivery have influenced the present health care delivery and service. This is especially the case for obstetrical care since the whole process of childbirth has been transformed into a medical issue administered mainly by southern, non-Inuit health care workers and policy makers. Using 350 maternal and infant health records from the Baffin Regional Hospitals from September 1993 to September 1994, variables such as maternal age, fertility rates and low birth weight rates were calculated for communities in the region to …

Managing External Threats To National Parks In Canada's Western Mountains (Alberta), George Yap

Theses and Dissertations (Comprehensive)

External threats to protected areas exist because the area encompassed by the legal boundaries of many protected areas is less than what is needed to maintain a minimum viable population of various animal species and some types of plant associations. While external stresses to parks are the result of a wide range of human activities, they threaten ecological integrity in two general ways: by contributing to habitat fragmentation, alienation and loss (HFAL), and/or undermining the long-term viability of transboundary animal populations. However, in comparison to internal threats, addressing external threats is considerably more complex since park managers have no legal …

An Evaluation Of Pump-Level Service As A Locational Variable Within Canada's Retail Gasoline Industry, Ian W.R. Gilbart

Theses and Dissertations (Comprehensive)

Marketers who are searching for prime retail locations for gasoline outlets, and other automobile-oriented activities, in today’s market are faced with an increasingly complex process. As land and development costs escalate, competition increases and margins are tightened, there is a greater need for marketers within the retail gasoline industry to pinpoint sites that offer the best profit potential (Gilbart, 1994). In turn, large gasoline chains attempt to develop networks of stations that optimize market coverage and consumer convenience while minimizing costs. In response to the evolution of an increasingly dynamic marketplace, experts within the retail gasoline industry have invested a …

Mechanisms Of Pentachlorophenol Induced Charge Transport In Lipid Membranes, William Charles Brown

Dissertations and Theses

Pentachlorophenol (PCP) is one of the prominent environmental pollutant that has penetrated into food chain and is present in humans. Health concerns have been raised since daily intake of PCP by the US population is estimated to be 16-19 µg. PCP facilitates dissipation of electrochemical potential gradients of hydrogen ions across energy transducing membranes, which are the energy sources for the conversion of adenosine diphosphate into adenosine triphosphate. Closely linked to these dissipative effects is the development of electrical conductivity in lipid membranes, induced by the presence of PCP. Three modes of PCP - induced membrane electrical conductivity were theoretically …

Synthesis Of Polyphosphate Esters From Pentaerythritol Ester Of Phosphorochloridic Acid And Diols, Guoping. Deng

Electronic Theses and Dissertations 1990 - 1999

Polyphosphate esters have been synthesized from reaction of the pentaerythritol ester of phosphorochloridic acid with different diols--bisphenol A, 1,6-hexanediol, 1,3-bis(4-hydroxybutyl)-tetramethyldisiloxane and 5-iodo-2'-deoxyuridine. All products are medium to high molecular weight. The product from bisphenol A gives fibers from concentrated solution. The product from 1,3-bis(4-hydroxybutyl)-tetramethyldisiloxane acts as an adhesive. The products were made for potential flame retardant applications in the electronics industry. The characterizations by MS, NMR and FT-IR are in agreement with the proposed structures.

Transactions Of The Nebraska Academy Of Sciences Table Of Contents: Volume 23 (1996)

Transactions of the Nebraska Academy of Sciences and Affiliated Societies

Editorial Contents

Nebraska Academy of Sciences Officers, Policy Committee .................... ii

Editorial Board .................... iv

Membership Objectives and Friends of the Academy .................... v

Nebraska Association of Teachers of Science .................... vi

Preparation of manuscripts .................... inside back cover

Papers

Environmental impacts in the vicinity of Spencer Hydropower Dam during sluicing activities in the Niobrara River, Nebraska (Michael P. Gutzmer, Justin W. King, and David P. Overhue) .................... 1

Inventory and floristics of Sandhills fens in Cherry county, Nebraska (Gerald Steinauer, Steven Rolfsmeier, and Joyce Phillips Hardy) .................... 9

Xylem pressure potential of two perennial grasses, Bromus inermis and Andropogon …

Hi-O-Hi 1996, Oberlin College

Hi-O-Hi Yearbooks

No abstract provided.

A Study To Determine The Need To Include Technology Education As A Required Part Of General Education And Its Effectiveness In Preparing Students For Trade And Industrial Courses, Shon M. Walter

OTS Master's Level Projects & Papers

The following questions were considered for this study: 1. Does technology education offer applicable skills need by all students? 2 Are the technology courses in high school primarily preparing students who are continuing to technical education? 3. Do technology classes help non-college bound students prepare for the work place?