Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Environmental Sciences (2738)
- Physics (1868)
- Earth Sciences (1340)
- Life Sciences (1119)
- Water Resource Management (753)
-
- Engineering (746)
- Civil and Environmental Engineering (576)
- Chemistry (481)
- Mathematics (480)
- Geology (450)
- Computer Sciences (338)
- Oceanography and Atmospheric Sciences and Meteorology (307)
- Condensed Matter Physics (296)
- Statistics and Probability (288)
- Natural Resources and Conservation (286)
- Soil Science (235)
- Ecology and Evolutionary Biology (168)
- Animal Sciences (163)
- Atmospheric Sciences (159)
- Plant Sciences (136)
- Other Earth Sciences (133)
- Environmental Indicators and Impact Assessment (115)
- Astrophysics and Astronomy (114)
- Applied Statistics (101)
- Biochemistry, Biophysics, and Structural Biology (101)
- Aquaculture and Fisheries (98)
- Climate (94)
- Natural Resources Management and Policy (94)
- Social and Behavioral Sciences (84)
- Keyword
-
- Utah (358)
- Environmental (148)
- Impact (125)
- Management (111)
- Statement (97)
-
- Final (92)
- Physics (87)
- Water (80)
- Idaho (74)
- Ionosphere (65)
- Climate change (63)
- National (61)
- Assessment (60)
- Plan (56)
- Soil (56)
- Equator (51)
- Energy (48)
- Wyoming (46)
- Mesosphere (45)
- Geology (44)
- Study (42)
- Project (41)
- Decision (40)
- Record (39)
- Resource (39)
- Flood insurance study (38)
- Area (36)
- Field (36)
- Plasma (36)
- Analysis (35)
- Publication Year
- Publication
-
- All Graduate Theses and Dissertations, Spring 1920 to Summer 2023 (1427)
- All Physics Faculty Publications (652)
- Reports (558)
- All U.S. Government Documents (Utah Regional Depository) (403)
- Memorandum (316)
-
- All Graduate Plan B and other Reports, Spring 1920 to Spring 2023 (288)
- Chemistry and Biochemistry Faculty Publications (219)
- Presentations (189)
- Wildlife Damage Management Conference (189)
- Watershed Sciences Faculty Publications (146)
- Utah Space Grant Consortium (137)
- Posters (129)
- Physics Capstone Projects (117)
- Progress reports (117)
- Environment and Society Faculty Publications (108)
- Elusive Documents (102)
- Bela G. Fejer (96)
- Mathematics and Statistics Faculty Publications (84)
- Undergraduate Honors Capstone Projects (81)
- Wildland Resources Faculty Publications (78)
- Forestry (75)
- Student Research Symposium (73)
- All Graduate Theses and Dissertations, Fall 2023 to Present (72)
- Browse all Datasets (70)
- Geosciences Faculty Publications (70)
- Plants, Soils, and Climate Faculty Publications (70)
- Publications (61)
- Funded Research Records (54)
- Conference Proceedings (51)
- Journal Articles (43)
- Publication Type
- File Type
Articles 7051 - 7080 of 7332
Full-Text Articles in Physical Sciences and Mathematics
The Influence Of Thermo-Gradients Upon Water Movement And Retention In Unsaturated Soils, Jose V. Salazar
The Influence Of Thermo-Gradients Upon Water Movement And Retention In Unsaturated Soils, Jose V. Salazar
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Temperature differences of about 5, 10, and 15 V, were applied to uniformly packed and insulated horizontal column of Millville silt loam soil using mean temperatures near 13, 14, 15, 16, 17, 18, 19, 20 and 23.5 C. The temperature distribution along the soil column was determined using copper constantan thermocouples. Soil samples were taken to determine volumetric moisture content, and soil water potential, using the vapor pressure psychometer technique. The thermodynamic flow equation of Taylor and Cary, (1964) was used to calculate the hydro-thermal transfer coefficient (ß) as given by:
-ß = d(μw)T / dlnT
where …
Geology Of The West-Central Part Of The Malad Range, Idaho, Phillip H. Wach
Geology Of The West-Central Part Of The Malad Range, Idaho, Phillip H. Wach
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The west-central part of the Malad Range is located in south-eastern Idaho. This area was the site of thick marine deposition in the early Paleozoic period. In the Tertiary and Quaternary periods continental deposition occurred, covering the Paleozoic rocks. Quartzite and shale units of the Brigham Quartzite are found near the base of the Cambrian section. Carbonate with shale interbeds is found in the middle and late Cambrian units. Limestone and silty limestone are found in the early and middle Ordovician time overlain by the middle Ordovician Swan Peak Quartzite. The Laketown Dolomite includes units of late Ordovician and Silurian …
Geology Of The Northern Part Of The Malad Range, Idaho, Drew C. Axtell
Geology Of The Northern Part Of The Malad Range, Idaho, Drew C. Axtell
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Rocks of Paleozoic, Tertiary, and Quaternary age are represented in the northern part of the Malad Range. The Paleozoic rocks are represented by thirteen formations that are characterized lithologically by quartzites, shales, and carbonates. The oldest formation in the mapped area of Paleozoic age is the Brigham Formation, and the youngest formation is the Jefferson Formation of late Devonian age.
The rocks of Tertiary age are conglomerates, shales, and limestones and are represented by the Wasatch Formation, the Salt Lake Formation, and boulders. Quaternary rocks include sediments of the Lake Bonneville Group and alluvium.
The faults in the mapped area …
Design Optimization Using Model Estimation Programming, Richard Kay Brimhall
Design Optimization Using Model Estimation Programming, Richard Kay Brimhall
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Model estimation programming provides a method for obtaining extreme solutions subject to constraints. Functions which are continuous with continuous first and second derivatives in the neighborhood of the solution are approximated using quadratic polynomials (termed estimating functions) derived from computed or experimental data points. Using the estimating functions, an approximation problem is solved by a numerical adaptation of the method of Lagrange. The method is not limited by the concavity of the objective function.
Beginning with an initial array of data observations, an initial approximate solution is obtained. Using this approximate solution as a new datum point, the coefficients for …
Fortran Programs For The Calculation Of Most Of The Commonly Used Experimental Design Models, H. Wain Greenhalgh
Fortran Programs For The Calculation Of Most Of The Commonly Used Experimental Design Models, H. Wain Greenhalgh
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Two computer programs were developed using a CDC 3100. They were written in FORTRAN IV.
One program uses four tape drives, one card reader, and one printer. It will calculate factorial analysis of variance with or without covariance and/or multivariate analysis for one to eight factors and up to twenty-five variables.
The other program is used for completely randomized designs, randomized block designs, and latin square designs. It will handle twenty-five treatments, rows (blocks), and columns. The program can handle fifteen variables using any number of these variables for covariates.
An Exposition On Bayesian Inference, John Laffoon
An Exposition On Bayesian Inference, John Laffoon
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The Bayesian approach to probability and statistics is described, a brief history of Bayesianism is related, differences between Bayesian and Frequentist schools of statistics are defined, protential applications are investigated, and a literature survey is presented in the form of a machine-sort card file.
Bayesian thought is increasing in favor among statisticians because of its ability to attack problems that are unassailable from the Frequentist approach. It should become more popular among practitioners because of the flexibility it allows experimenters and the ease with which prior knowledge can be combined with experimental data.
Rational Arithmetic As A Means Of Matrix Inversion, Jay Roland Peterson
Rational Arithmetic As A Means Of Matrix Inversion, Jay Roland Peterson
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The solution to a set of simultaneous equations is of the form A-1 B = X where A-1 is the inverse of A in the equation AX= B. The purpose of this study is to obtain an exact A-1 through the use of rational arithmetic, and to study the behavior of rational numbers when used in arithmetic calculations.
This study describes a matrix inversion program written in SPS II, utilizing the concept of rational arithmetic. This program, using the Gaussian elimination matrix inversion method, is compared to the same method written in Fortran. Gaussian elimination …
Experiments On The Inactivation Of Zinc By The Mineral Fractions Of The Soil, John J. Hassett
Experiments On The Inactivation Of Zinc By The Mineral Fractions Of The Soil, John J. Hassett
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Zinc deficiency, in many cases, is closely related to organic matter decomposition. DeRemer and Smith (1964) studied the effects of decomposing sugar beet tops on the reactions of Zn65 in a Portneuf soil. They found that with time the Zn65 associated with lime minerals, exchangeable, and water soluble fractions of the soil decreased, while that found with the organic and mineral fractions increased. This increase in the mineral fraction is of particular interest, since the majority of the Zn65 was found to be with this fraction after a period of time. They also showed that the increase …
The Influence Of Irrigating With Saline Water On The Energy Status Of Water In Soil And Plant, Rolando H. Braun
The Influence Of Irrigating With Saline Water On The Energy Status Of Water In Soil And Plant, Rolando H. Braun
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
- Changes in the energy status of water that occurred in Milville silt loam and in bean (Phaseolus vulgaris L.) plants growing on it , during two consecutive 6-day periods while being irrigated with saline solutions, were studied.
- Total soil water potential (Ψ soil) (measured with thermocouple psychrometers), matric-potential (Ψm) (measured with tensiometers) were considered. In leaf samples, the total water potential (leaf) and the osmotic potential (Ψπ)--after freezing-- were determined with thermocouple psychrometers; by difference, the pressure potential (Ψp) was obtained.
- There is no evidence of close relationship between changes taking place in …
Movement Of Atrazine In Soil Under Furrow Irrigation, Jyothi Veerabhadrappa
Movement Of Atrazine In Soil Under Furrow Irrigation, Jyothi Veerabhadrappa
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Movement of atrazine in response to furrow irrigations was studied using the samples of Timpanogos silt loam soil. Distribution in soil profile of surface applied herbicide was determined by drawing samples of water extracts through porous cylinders. Atrazine quantity was determined by spectrophotometer.
It was observed that the herbicide found in the water extracts was an indication of the quantity present in the soil. The herbicide moved readily with the applied water. Irreversible thermodynamic model could not be applied because of the initial and final boundary conditions. The pattern of movement was in conformity with the chromatographic theory.
A Modern Philosopher's Stone, Grant Gill Smith
A Modern Philosopher's Stone, Grant Gill Smith
Faculty Honor Lectures
Alchemists, the forerunners of chemists, for more than a millennium sought the "Philosopher's Stone"-the transmuting agent that could change imperfect base metals such as lead and tin to the noble metals, gold and silver, and also serve as the Elixir of Life to heal the infirmities of man and prolong his existence on earth.
Where alchemy failed, chemistry, in little more than a century, has succeeded in finding the "Philosopher's Stone," for it is now not only possible to transmute one metal into another and heal many of man's infirmities, but scarcely a facet of man's life has not been …
Frequency Analyses And Probable Storage Requirements By Frequency Mass Curve Methods, Roland W. Jeppson
Frequency Analyses And Probable Storage Requirements By Frequency Mass Curve Methods, Roland W. Jeppson
Reports
Background of Program: In devloping a water resources atlas for the State of Utah, numerous stream flow records were analyzed to determine their flow characteristics. The objective was to present the results in a format which is well adapted for use by water resources planners in preliminary designs to obtain optimum benefits from the water resources. The program described in this booklet was written to determine the probable amounds of storage required in order to meet specified levels of sustained demand for water. The method used not only gives information concerning amounts of storage but also information concerning the probably …
The Structure Of Turbulence In An Open Channel With Large Spherical Roughness Elements, Farooq Nazir
The Structure Of Turbulence In An Open Channel With Large Spherical Roughness Elements, Farooq Nazir
Reports
The present status of knowledge of turbulent flow is inadequate, especially in the case of rough open channels, for the formulation of a general theory. It is believed that more experimental data and the subsequent interpretation of these data are necessary before a workable theory can be formulated. Hence, a description of the turbulence present in a rough open channel can be valuable. For this study an artificially roughened bed 48 feet in length was placed in a channel 8 feet wide and 6 feet deep. Measurements were made of the following properties of turbulence at three different slopes: 1. …
Administrative Budget Needs 1967-69, Utah Water Research Laboratory
Administrative Budget Needs 1967-69, Utah Water Research Laboratory
Reports
No abstract provided.
Influences Of Exposure On Pan Evaporation In A Mountainous Area, Eugene L. Peck
Influences Of Exposure On Pan Evaporation In A Mountainous Area, Eugene L. Peck
Reports
The effects of exposure on pan evaporation rates were studied at the Davis County Experimental Watershed near Farmington, Utah, by operating a network of 12 class A evaporation stations on the watershed during the summer months of 1962 through 1966. Standard Weather Bureau observations on a daily basis were obtained from a total of 17 different sites representing widely idverse topography with a vertical range of 4, 630 feet. Deviations from mean relations with elevation on monthly values of observed meteorological factors were found to be related to the type of exposure. Dewpoint observations on different slopes were found to …
Subcritical Flow Over Highway Embankments, Gaylord V. V. Skogerboe, M. Leon Hyatt
Subcritical Flow Over Highway Embankments, Gaylord V. V. Skogerboe, M. Leon Hyatt
Reports
Introduction: At Utah State University, considerable effort has been devoted to the analysis of submerged flow at open channel constrictions. A method of analyzing subcritical (submerged) flow has been developed for flumes. Because of previous findings, it was felt that this method of analyzing submerged flow could be applied to highway embankments. A highway embankment, when overtopped by flood waters, is a form of broad-crested weir. Being a weir, the flood discharge over the embankment is only a function of the upstream depth for free flow conditions. This paper will present a method for determining the discharge under submerged flow …
Reliability Of Can-Type Precipitation Gage Measurements, C Earl Israelsen
Reliability Of Can-Type Precipitation Gage Measurements, C Earl Israelsen
Reports
A comprehensive review of literature was made of studies conducted since 1952 pertaining to the accuracy of can-type precipitation gage measurements. Brief discussions are given of the results of some of them, and conclusions are drawn. Topics discussed include raingage comparisons, accuracy of precipitation measurements, precipitation gage errors, and precipitation measurements in mountains. A bibliography is included
Mathematical Simulation Of Small Watershed Hydrologic Phenomena, V. V. Dhruva Narayana, Jay M. Bagley
Mathematical Simulation Of Small Watershed Hydrologic Phenomena, V. V. Dhruva Narayana, Jay M. Bagley
Reports
In many hydrologic investigations concerning small watersheds, data and observations are totally inadequate to provide a basis for outflow hydrographs. Consequently, a variety of empirical approaches have been developed which have limited rational validity. Hydrograph synthesis offers a reasonable approach to predicting the outflow hydrograph characteristics. In order to synthesize a hydrograph, it is necessary to mathematically describe the physical behavior of the dynamic processes involved in the hydrologic phenomena. Hydrograph synthesis may be considered to comprise (a) hydrographs (actual or simulated) of precipitation, (b) hydrographs of abstractions such as interception, infiltration, and depressional storage, (c) routing or translating the …
Rectangular Cutthroat Flow Measuring Flumes, Gaylord V. V. Skogerboe, M. Leon Hyatt
Rectangular Cutthroat Flow Measuring Flumes, Gaylord V. V. Skogerboe, M. Leon Hyatt
Reports
Introduction: Procedures and methods for more accurate measurement and improved management of water are continually being sought to make better use of our water resources. Of all the devices and structures developed for measuring water, measuring flumes are among the most widely accepted and used. The most common measuring flume is the Parshall flume developed by Ralph Parshall at Colorado State University. Common to most flumes is the basic geometry consisting of a converging inlet section, a throat, and a diverging outlet section. Occasionally, the diverging outlet section is removed under free flow conditions, and the water is allowed to …
Using Remote Infrared Sensors To Detect Changes In Moisture Conditions On Natural Watersheds, Ralph D. Briscoe, Frank W. Haws
Using Remote Infrared Sensors To Detect Changes In Moisture Conditions On Natural Watersheds, Ralph D. Briscoe, Frank W. Haws
Reports
Foreword: This report summarizes the results of laboratory measurements of the infrared reflectance of selected living plants typical of the natural watersheds in northern Utah. Data indicate that the IR reflectance decreases as the moisture content of the soil decreases and the moisture tension in the soil increases. Additional data will be collected in the field to confirm the results and to further tests the feasibility of using IR reflectance of vegetation as an indicator of soil moisture conditions on the watershed. Mr. Briscoe, Research Physicist, has been responsible for the gathering of laboratory data and has written the manuscript …
Finite Difference Solutions To Free-Surface Flow Through Nonhomogeneous Porous Media, Roland W. Jeppson
Finite Difference Solutions To Free-Surface Flow Through Nonhomogeneous Porous Media, Roland W. Jeppson
Reports
No abstract provided.
Consecutive Streamflow Averages For 90 Utah Stations, A. Leon Huber
Consecutive Streamflow Averages For 90 Utah Stations, A. Leon Huber
Reports
No abstract provided.
Application Of An Electronic Analog Computer For The Simulation Of Hydrologic Events On A Southwest Watershed, J. Paul Riley, Duane G. Chadwick
Application Of An Electronic Analog Computer For The Simulation Of Hydrologic Events On A Southwest Watershed, J. Paul Riley, Duane G. Chadwick
Reports
The hydrologic characteristics of watersheds in semiarid regions are dependent upon many variable and often interrelated factors. A quantitative knowledge of these factors and of their relative influence upon the system as a whole is needed in order to improve the efficiency of watershed management in these areas. In an attempt to develop a comprehensive simulation model of a semiarid watershed, research workers in the Agricultural Research Service considered the electronic quently signed with Utah State University. Analog modeling concepts are based upon the development of basic relationships which describe the various processes which occur within the surface hydrologic system …
Analysis Of Submergence In Flow Measuring Flumes, Gaylord V. V. Skogerboe, M. Leon Hyatt
Analysis Of Submergence In Flow Measuring Flumes, Gaylord V. V. Skogerboe, M. Leon Hyatt
Reports
Submerged flow exists in a measuring flume when a change in flow depth downstream from the flume causes a change in flow depth upstream for any particular constant value of discharge. When a change in tailwater depth does not affect the upstream depth, free flow exists. To evaluate the discharge under free-flow conditions, it is necessary to measure only a flow depth upstream from the contracted section (throat) of the flume, whereas two flow depths must be measured to evaluate the discharge under submerged-flow conditions. The two flow depths normally measured when submerged flow exists consist of the same upstream …
Proceedings Of A Symposium: Pollution Control Of Industrial Wastewaters, Calvin K. Sudweeks, Lynn M. Thatcher, Elmo Morgan, Franklin J. Agardy, R. E. Pailthorp, John C. Merrell Jr.
Proceedings Of A Symposium: Pollution Control Of Industrial Wastewaters, Calvin K. Sudweeks, Lynn M. Thatcher, Elmo Morgan, Franklin J. Agardy, R. E. Pailthorp, John C. Merrell Jr.
Reports
No abstract provided.
Frequency And Magnitudes Of Monthly And Annual Flow Rates (As Determined By (A) A Normal Distribution (B) By Ranking (C) A Gamma Distribution And (D) By A Log Normal Distribution), Roland W. Jeppson
Reports
Background of Program: In developing a water resources atlas for the State of Utah it was necessary to determine the characterisitcs of stream flows within the State. The variations of stream flow for any given month from year to year as well as the variations from month to month throughout the year are important characterisitcs which are determined by analyzing the streamflow records to determine their probability distributions. The program which is descirbed in the following pages was written to determine the monthly as well as annual runoff amounts which might be expected for any number of specified levels of …
Design And Calibration Of Submerged Open Channel Flow Measurement Structures: Part 4 - Weirs, Gaylord V. Skogerboe, M. Leon Hyatt, Lloyd H. Austin
Design And Calibration Of Submerged Open Channel Flow Measurement Structures: Part 4 - Weirs, Gaylord V. Skogerboe, M. Leon Hyatt, Lloyd H. Austin
Reports
No abstract provided.
A Procedure For Determining The Feasibility Of Planned Conjunctive Use Of Surface And Ground Water, Barry C. Saunders
A Procedure For Determining The Feasibility Of Planned Conjunctive Use Of Surface And Ground Water, Barry C. Saunders
Reports
Improved management of water resources is one means for alleviating deficiencies in water supply. One promising management technique is integration of ground water and surface water supplies and storage unites, or planned conjunctive use. In order to assess the value of this technique in relations to a particular area or basin, it is necessary to look at the economic, hydrologic, and legal system as a whole. A planning procedure is developed which will enable feasibility to be determined at a minimum cost.
The procedure consists of determining legal constraints, estimating benefits which will accrue to additional water, estimating the quantity …
Brief Abstracts Of Some Papers On Seeding Agents, Jay D. Schiffman, Joel E. Fletcher
Brief Abstracts Of Some Papers On Seeding Agents, Jay D. Schiffman, Joel E. Fletcher
Reports
During the preparation of a work plan for a study of the atmospheric water resources in Utah, a number of publications were studied which presented information pertaining to agents used to modify weather. These publications have been compiled to eliminate repetition of this laborious task. Brief abstracts of these papers were prepared to help investigators determine whether or not they wish to see the original publications.
Estimating Water Yields In Utah By Principal Component Analysis, Leei-Luoh Wang, A. Leon Huber
Estimating Water Yields In Utah By Principal Component Analysis, Leei-Luoh Wang, A. Leon Huber
Reports
The basic hydrologic data required to determine the water yield are usually unavailable for small basins and streams while increasing emphasis is being placed on their development. Therefore, some methods and techniques for estimating the amount of water available for development of these small units is needed. The purpose of this study is to use the concepts and techniques of statistical analysis to develop equations which are useful in estimating the water yield of watersheds for which no stream flow records are available. The approach is an extension of earlier studies at Utah State University (1, 10) in which physiographic …