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Articles 20281 - 20310 of 20684
Full-Text Articles in Physical Sciences and Mathematics
Nitrate Pollution Of Ground Water In Glacial Sediments Underlying A Fertigated Site In Kalamazoo County, Michigan, Michael Wireman
Nitrate Pollution Of Ground Water In Glacial Sediments Underlying A Fertigated Site In Kalamazoo County, Michigan, Michael Wireman
Masters Theses
In the central part of Schoolcraft Township high yield corn crops are successfully grown on soils developed on permeable outwash deposits. The high yields are made possible with the utilization of modern irrigation techniques and regular application of nitrogen fertilizer.
Excess nitrogen which moves past the root zone is easily converted to nitrate and leached to the shallow ground water. Water quality data from 103 ground-water samples in the vicinity of a 160-acre corn field in Section 11 clearly indicate that nitrate concentrations in the ground water beneath the field and beneath the area immediately downgradient from the field are …
Possible Role Of Petroliferous Materials In Sulfide Precipitation At The Frank R. Millikan Mine, Southeast Missouri, Clark Alan Niewendorp
Possible Role Of Petroliferous Materials In Sulfide Precipitation At The Frank R. Millikan Mine, Southeast Missouri, Clark Alan Niewendorp
Masters Theses
The Millikan Mine's ore body contains ubiquitous amounts of petroliferous materials occurring as blebs, coal-like pods and veinlets, and seeps coating mine stope walls. Emplacement of hydrocarbons into the ore occurred before the final episode of mineralization ceased, based on growth of dendritic galena in some coal-like bitumen and other paragenetic relationships. Growth of dendritic galena in a hydrocarbon substance suggests that hydrocarbons provided sulfur for galena mineralization by either abiogenetic reduction of sulfate or thermochemical evolution of organic sulfur. Texturally, it also suggests that the presence of hydrocarbons may have been responsible for some zones of rapid precipitate mineralization. …
The Evolution Of Text Formatting Languages, Dirk Herr-Hoyman
The Evolution Of Text Formatting Languages, Dirk Herr-Hoyman
Masters Theses
Text, as seen in books and magazines, can take on three forms: string, graphic (two-dimensional), and image (digitized pictures). Text formatting processes text into a representation suitable for printing. Since a printer is really a computer, this representation is machine code for the printer. ASCII is one such code.
Six historically significant text formatting languages are surveyed: Runoff, Troff, TeX, Bravo, Scribe, and Postscript. The emphasis is on the text types available and the code generated. The main evolutionary forces are the changes in printers. Comparisons are made with programming languages.
Each of the six languages has ASCII as its …
Robust Rank Analysis For Multivariate Linear Models, James Buddy Davis
Robust Rank Analysis For Multivariate Linear Models, James Buddy Davis
Dissertations
Three robust rank procedures are considered to test the multivariate linear hypothesis HBK = 0. In the least squares setting, the Lawley-Hotelling trace criterion provides a UMP when the covariance structure is known. Our work reflects the theoretical structure of the Lawley-Hotelling test with robust rank analogues.
The Lawley-Hotelling test has an asymptotic chi-square distribution when the covariance structure is estimated. The trace criterion can be written in three algebraically equivalent forms: a quadratic test based on full model estimates, a quadratic test based on reduced model residuals and a test based on the drop in the least squares dispersion …
Structural Geology And Geothermal Investigation Of The White Sulphur Springs Area, Montana, William G. Gierke
Structural Geology And Geothermal Investigation Of The White Sulphur Springs Area, Montana, William G. Gierke
Masters Theses
Sevier thrusting in the White Sulphur Springs area was associated with left-lateral movement along the Lewis and Clark line . During Middle Miocene time, the Lewis and Clark line exhibited right-lateral movement, forming extensional features that either truncated Sevier structures or followed preexisting Sevier zones of weakness.
The Smith River Valley is a pull-apart basin that is filled with Tertiary volcanic ash and clay-rich sediments that are thermally nonconductive relative to surrounding rocks.
Hydrothermal activity in the area is associated with a structurally controlled circulation system accompanied by a high thermal gradient. Thermal discharge is constrained along the north-trending White …
The Effect Of Well Efficiency On In-Situ Permeability Test Results, Scott T. Dennis
The Effect Of Well Efficiency On In-Situ Permeability Test Results, Scott T. Dennis
Masters Theses
The purpose of this study was to determine what effect well efficiency has upon the results of in-situ permeability tests.
Several in-situ permeability tests were performed on wells during various stages of their development. The well efficiency was determined each time an in-situ test was performed. An accurate value of permeability was determined by performing local aquifer pumping tests. The accuracy of the results of the in-situ tests with respect to the aquifer pump test results were then compared to the efficiency of the well at the time of the test.
Test results showed that a linear relationship exists between …
Testing Of Beam Line For Charge Exchange Measurements, Mohd. Noor Ali
Testing Of Beam Line For Charge Exchange Measurements, Mohd. Noor Ali
Masters Theses
The atomic physics beam line in the Western Michigan University accelerator laboratory was tested for the first time for making atomic charge-exchange experiments. Cross sections obtained for single electron capture and loss for 25 MeV oxygen ions incident on a helium gas target are in reasonable agreement with previous measurements. These results indicate that the system is operating properly. An attempt to observe a nuclear resonance effect on electron capture and/or loss was not successful. However, it was determined that additional collimation is necessary for such measurements.
A Study Of The Direct Capture Process Of Protons By 27Al, Rozana Hussain
A Study Of The Direct Capture Process Of Protons By 27Al, Rozana Hussain
Masters Theses
An experimental investigation of the 27Al(p,γ)28Si reaction was made for protons in the energy range 550- to 1785-keV and at angles of 0, 20, 55, 90 and 118 degrees. Four angular distributions at Ep = 845-, 1055-, 1135-, and 1618-keV were selected for detailed study. These angular distributions were fit with theoretical calculations employing a directcapture model. These fits permitted the extraction of spectroscopic factors for the population of the first excited-state in 28Si by proton transfer.
The Preparation And Reaction Of Novel Glycosyl Ureas And Thioureas, Robert Scott Johnson
The Preparation And Reaction Of Novel Glycosyl Ureas And Thioureas, Robert Scott Johnson
Masters Theses
No abstract provided.
Geology Newsletter- 1986, Department Of Geology
Geology Newsletter- 1986, Department Of Geology
Geological and Environmental Sciences News
Vol. 1, No. 11
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Design And Analysis Of Efficient Algorithms To Solve The Maximum Concurrent Flow Problem, Farhad Shahrokhi
Design And Analysis Of Efficient Algorithms To Solve The Maximum Concurrent Flow Problem, Farhad Shahrokhi
Dissertations
The maximum concurrent flow (MCFP) is a generalized commodity flow problem, where every pair of entities can send and receive flow Ma85 , BM86 , MS86 . We develop efficient labeling algorithms to solve the MCFP. We explore the combinatorial structure of the MCFP and show that the problem of associating costs (distances) to the edges so as to maximize the minimum cost of routing the concurrent flow is the dual of the MCFP. This duality covers max-flow min-cut theorem as a special case. Applications in packet switched networks At81 and cluster analysis Ma86 are discussed.
High Performance Liquid Chromatographic Determination Of Thromboxane B2 In Human Serum As A Methoxime-Panacyl Ester Derivative, Robert H. Pullen
High Performance Liquid Chromatographic Determination Of Thromboxane B2 In Human Serum As A Methoxime-Panacyl Ester Derivative, Robert H. Pullen
Masters Theses
No abstract provided.
The Design And Analysis Of Drug Combination Experiments, Thomas J. Vidmar
The Design And Analysis Of Drug Combination Experiments, Thomas J. Vidmar
Dissertations
Past literature concerning drug combination studies is reviewed. This literature has both biological and statistical origins. The justification of the logit transformation for dichotomous responses in a linear models framework is made by observing its similarities to models proposed by others. Using the logistic linear model, optimal experimental designs are derived. Methods for obtaining parameter estimates are discussed as are diagnostic techniques for logistic regression. Two new robust techniques for logistic regression are proposed and compared to a robust technique suggested in the literature via Monte Carlo simulation. Finally, estimation of the median effective dose (ED50) and the resulting confidence …
Horizontal Fragmentation And Allocation In A Distributed Database For Cost Minimization With Reliability And Space Constraints, Elmo Loren Ivey
Horizontal Fragmentation And Allocation In A Distributed Database For Cost Minimization With Reliability And Space Constraints, Elmo Loren Ivey
Masters Theses
In this paper a method for horizontal fragmentation of a relational database is presented. A method is given for calculating the benefit or cost savings obtained by allocating a given fragment to a site, independently for each site.
To obtain optimal benefit each fragment is allocated to all sites where there is a positive benefit. This may result in the allocation of some fragments to multiple sites.
Finally a method is given for removing or reallocating certain fragments from sites with insufficient storage. Also, a method is given for allocating fragments to multiple sites to meet constraints on the required …
A Hydrogeologic Investigation Of The Balkema Wetland, Daniel V. Fronczek
A Hydrogeologic Investigation Of The Balkema Wetland, Daniel V. Fronczek
Masters Theses
The Balkema wetland, located In southwestern Kalamazoo County, Michigan, represents complex biological and hydrologic Interaction between surface water and a two-aquifer hydrologic system. Situated on the southeastern flank of the Kalamazoo moraine, the glacial geology of the area plays a key role in the understanding of the hydrogeologic function of the wetland. A two-aquifer system, an upper unconfined, and a lower confined, Interact In the vicin ity of the wetland where the c la y /till aqulclude dividing the two systems 1s absent. Various parameters, both hydrologic and geochemical, were measured In the study area, Including specific conductance values of …
Determination Of Phenomenological Optical Model Parameters For Neutrons On 208Pb From 4 To 150 Mev, Randy L. Schutt
Determination Of Phenomenological Optical Model Parameters For Neutrons On 208Pb From 4 To 150 Mev, Randy L. Schutt
Masters Theses
Phenomenological o p tic a l model parameters for neutrons incident on 208Pb have been determined for neutron energies from 4 to 150 MeV using the code SNOOPY-8. Neutron total cross sections from 4 to 150 MeV and angular distributions for elastic scattering from 13.5 to 40.0 MeV were utilized. Analyses of total and differential cross sections were performed at a number of energies to determine energy dependent expressions for the real strengths of the central potential, imaginary surface potential, and imaginary volume potential. These energy dependent expressions for V, Wd, and WS were found to …
A General Design Tool For Computer Directories, Edward J. Peeler
A General Design Tool For Computer Directories, Edward J. Peeler
Masters Theses
The primary objective of a directory is to organize information for efficient retrieval. There are many techniques that can be applied to the design of a directory. One particularly useful technique employs the use of inverted files on range attributes. The technique provides an effective directory for a variety of applications and for very large databases. This paper examines the technique and describes the implementation of a general design tool based on these principles.
Experiment Module For Microprocessor Based Data Acquisition And Speech Processing, Namazi Bin Azhari
Experiment Module For Microprocessor Based Data Acquisition And Speech Processing, Namazi Bin Azhari
Masters Theses
This project involves microprocessor applications to the acquisition of physical data. The experiment module developed here will help the physics teacher and the scientist demonstrate the uses and advantages of digital techniques to students. Specific examples of data acquisition and processing are illustrated using speech and repetitive waveforms. The project centers on a module that is programmed to perform a number of types of data recordings and processings.
Further Studies On Purification Of A Mannitol Binding Protein: Use Of Ph Gradients For Elution From Cation Exchange Resin, Kristyne Ann Baumgarten
Further Studies On Purification Of A Mannitol Binding Protein: Use Of Ph Gradients For Elution From Cation Exchange Resin, Kristyne Ann Baumgarten
Masters Theses
Studies on the purification of a mannitol binding protein (MBP) from Pseudomonas aeruginosa PAO were performed. Utilizing the alkaline isoelectric point (pi 8.3) of MBP, pH gradients were used to elute MBP from carboxymethylcellulose cation exchange resins. Purification of MBP was monitored by sodium dodecyl sulfate-polyacrylam ide gel electrophoresis (SDS-PAGE). Only one protein band was seen on SDS-PAGE from MBP fractions elutedat pH 7-8 and 8 .2. Although pH gradients appear to give good purification from cation exchange resins, these procedures lead to loss of MBP activity.
Jacobi Moments In Applied Mathematics With Computer Applications, John A. Kapenga
Jacobi Moments In Applied Mathematics With Computer Applications, John A. Kapenga
Dissertations
This work provides solid asymptotic representations, sharp error bounds and stable recurrence methods (both three term and two dimensional) for the Jacobi moments. These moments are currently used in several areas of numerical analysis (numerical integration, integral equations and boundary value problems).
A powerful representation theorem, due to H. Gingold, which uses the Jacobi moments is extended and analyzed. Applications of this theorem to multi-turning point problems and several other areas are given.
For a number of important problems in mathematical physics it is not possible to prove that the currently employed methods of solution converge, or are valid in …
An Investigation Into The Numeric Solution Of Linear Recurrence Relations, Dennis Lee Kapenga
An Investigation Into The Numeric Solution Of Linear Recurrence Relations, Dennis Lee Kapenga
Masters Theses
This is an investigation of the use of some techniques from numerical linear algebra in solving linear recurrence relations.
The classic methods of Oliver and Lozier are compared with several alternatives. These alternatives center on using advances in the theory of numerical linear algebra, computer software, and raw computer performance which have been made in the 15 years since the original research into linear recurrence relations was done.
A set of test examples is presented to provide a basis to compare solution methods. This set of examples was selected to allow experiments associated with the Poincare class of recurrence relations. …
Stratigraphic And Sedimentologic Analysis Of The Middle Devonian Filer Sandstone, John Charles Rodwan
Stratigraphic And Sedimentologic Analysis Of The Middle Devonian Filer Sandstone, John Charles Rodwan
Masters Theses
The Filer Sandstone, a multistory assemblage o£ lenticular sand bodies, is a member of the Middle Devonian Amherstburg Formation of the Detroit River Group in the subsurface of the western and central portion of the Michigan Basin. It is distinguished from the reworked eolian and nearshore marine sand facies of the underlying Sylvania Sandstone by recognition of its barrier island facies relationships and stratigraphic position within enclosing carbonates unique to the Amherstburg Formation. Lithologically, the Filer ranges from a fine-grained, carbonate-cemented, supermature quartzarenite at its upper shoreface facies, to a texturally-inverted sandy carbonate at its lagoonal facies. Facies distribution was …
Generalized Connectivity In Graphs, Ortrud R. Oellermann
Generalized Connectivity In Graphs, Ortrud R. Oellermann
Dissertations
The connectivity of a graph G is the minimum number of vertices in G whose deletion produces a disconnected or trivial graph, while the edge-connectivity of G is the minimum number of edges having this property. In this dissertation several generalizations and variations of these two parameters are introduced and studied.
Chapter I is an overview to the history of connectivity and provides a background for the chapters that follow. In Chapter II major n-connected subgraphs are introduced. Through this concept, the connectivities (of subgraphs) that are most representative in a given graph are studied.
Chapter III is devoted to …
A Study Of Classical Elastic Scattering For Heavy-Ion Nuclear Reactions, John C. Orrison
A Study Of Classical Elastic Scattering For Heavy-Ion Nuclear Reactions, John C. Orrison
Masters Theses
Numerical computer programs were developed to calculate the classical elastic scattering orbits, deflection functions and differential scattering cross-sections for a heavy-ion nuclear reaction model.
Critical points of the deflection functions and differential scattering cross-sections were examined.
Semiclassical modifications were developed for future study to account for the phase relation between independent orbits that lead to the same scattering direction.
Hydrodynamic Character Of The Dundee Limestone In The Central Michigan Basin, Ann Carol Little
Hydrodynamic Character Of The Dundee Limestone In The Central Michigan Basin, Ann Carol Little
Masters Theses
The Middle Devonian Dundee Limestone underlies most of the Lower Peninsula of Michigan. A potentiometric surface constructed of the formation, utilizing pressure data was compared to local and regional structure, permeability trends, specific gravity of the brines, oil accumulations, and surficial topography.
The data were distributed mainly in the central basin area, with information becoming more sparse around the basin margins. This created difficulties in the determination of the extent of control imparted by each of the factors, in flow direction. Surficial topography, on a regional scale, is likely the most influential of the controls, with the Dundee Limestone brines …
A Structural Investigation Of A Basement-Involved Thrust System In Southern Sphinx Mountain Quadrangle (Madison Range) Southwestern Montana, Jeffrey Scott Brown
A Structural Investigation Of A Basement-Involved Thrust System In Southern Sphinx Mountain Quadrangle (Madison Range) Southwestern Montana, Jeffrey Scott Brown
Masters Theses
The Madison Range is the eastern limb of the Laramide Rocky Mountain foreland Madison-Gravelly Arch. The main segment of the Madison thrust system in the map area is the basement-involved Scarface thrust which dips westward, trends north-northwest, and places Archean rocks onto an overturned footwall of Cambrian through Cretaceous rocks. Foliation of Archean rocks in the footwall is folded with overlying sedimentary rocks.
The Shedhorn Mountain thrust splays from the Scarface thrust. It is exposed north and south of the Shedhorn Mountain anticline, but is blind beneath it. The Taylor fault, an east-dipping back thrust, is inferred to be associated …
Reactive Counterion Surfactant Catalysis Of Hydroxamic Acid Hydrolysis With Perfluorooctanoic Acid, Mohamed El-Sayed Ayoub
Reactive Counterion Surfactant Catalysis Of Hydroxamic Acid Hydrolysis With Perfluorooctanoic Acid, Mohamed El-Sayed Ayoub
Masters Theses
A micellar effect upon the rate of hydrolysis of hydroxamic acids in aqueous perfluorooctanoic acid has been demonstrated for hydroxamic acids with chain lengths of six , eight, and ten carbons. In this system the counterion, hydrogenion, is a catalyst. Typical rate constant-surfactant concentration profiles for micellar catalysis were obtained. The results for these hydrolyses are consistent with the pseudo-phase model for micellar effects.
In addition the Arrhenius activation energies were determined for the reaction of octanohydroxamic acid at surfactant concentrations above and below the critical micelle concentration of the surfactant. The activation energy is lower for reaction in the …
An Evaluation Of The Effectiveness Of Bentonite As A Soil Additive For The Cover Material On The Kl Avenue Sanitary Landfill, Kalamazoo, Michigan, Neal J. Carey
Masters Theses
A principle objective of using bentonite as a soil additive is to reduce the permeability of a cover material, thus, inhibiting the infiltration of surface waters at landfill sites.
Twenty-two cores of the KL landfill were taken to obtain in-situ soil columns for testing. Coefficients of permeability were calculated for each soil column using the falling-head permeameter. Mechanical and hydrometer analyses were used for the grain size analysis. The methylene-blue test was employed to determine the actual percentages of bentonite present in each soil column. X-ray diffraction work was done on the clay fraction of each soil column to verify …
Microscopic Optical Potentials, Michael R. Sloothaak
Microscopic Optical Potentials, Michael R. Sloothaak
Masters Theses
No abstract provided.
The Effects Of Acid Precipitation On Two Lakes In Southwestern Michigan, Fardin Olyaei
The Effects Of Acid Precipitation On Two Lakes In Southwestern Michigan, Fardin Olyaei
Dissertations
The purpose of this study was to investigate the extent to which acid precipitation contributes acidity and heavy metals to lake environments. Asylum and Bonnie Castle Lakes, both located in the western portion of Kalamazoo County, served as the study sites. Precipitation samples were also taken at a site close to both lakes. Using the Hach Colorimeter, a preliminary study was undertaken to determine concentrations of the major cations (H('+), NH(,4)('+), K('+) and Ca('2+)), and major anions (NO(,3)('-), SO(,4)('2-), and PO(,4)('3-)). The main study dealt with the metal concentrations (Mn, Fe, Cu, Zn, and Pb) in rain/snow water, lakewaters, sediment, …