Digital Commons Network^™

Evaluating Water Reuse Alternatives In Water Resources Planning, A. Bruce Bishop, William J. Grenney, Rengasan Narayanan, Stanley L. Klemetson

Reports

Water reuse is a recognized option for augmenting water supplies to provide for expanded water needs. A methodology is developed for examining optimal strategies for water reuse within the context of the total water resources system, including both the provision of water supplies for various uses and management of wastewaters. A model of the water resources system is formulated as a “transportation “ or “transshipment” problem in linear programming depicting the possible sources of supply, including effluent sources available for reuse, which can be used to satisfy the requirements of various water users. The optimizing objective in the model is …

Modeling The Total Hydrologic-Sociologic Flow System Of Urban Areas - Phase Ii, Wade H. Andrews, J. Paul Riley, George B. Shih, Malcolm B. Masteller

Reports

Introduction and Overview: This is an interim report on Phase II of the three phase study. The objectives covered in this phase were: 1. To gather social and hydrologic data needed to calibrate and test the model. 2. The expand the physical model to include the rural part of the watersheds. 3. To test and improve techniques of the logical linking of the hydrologic and sociologic systems. 4. To begin adapting the model to the computer. During the second phase for the hydrologic component of the model major emphasis was placed on the expansion of the hydrologic area and the …

Effect Of Temperature On Algal Removal By Alum Coagulation, Muhammad Anis H. Al-Layla, E. Joe Middlebrooks, Donald B. Porcella

Reports

Questions about the effect of temperature on algal cell coagulation and the relationships between algae removal and temperature, alum dosage, paddle speed, flocculation time, and settling time are answered. The investigations consisted of two series of tests: Studies on algae cultured under laboratory control, and algae in wastewater stabilization ponds. The jar-test technique was used for the coagulation of algal suspensions by alum. Coagulation of algae is caused mainly by the insoluble flocs of aluminum hydroxide. Other aluminum species also have coagulative properties but are far less effective. The destabilization of algal colloids results from enmeshment within the hydroxide precipitates, …

Upgrading Wastewater Stabilization Ponds To Meet New Discharge Standards, Donna H. Falkdenborg, Ronald F. Lewis, Donald J. Ehreth

Reports

No abstract provided.

The Density Determination Of Rf Plasma Polymers, W. W. Knickmeyer, B. W. Peace, Kenneth G. Mayhan

Chemical and Biochemical Engineering Faculty Research & Creative Works

No abstract provided.

Intrinsic Viscosity Studies Of Linear Polyethylene Fractions In Good And Poor Solvents, J. S. Chiang, J. L. Zakin, Kenneth G. Mayhan

Chemical and Biochemical Engineering Faculty Research & Creative Works

No abstract provided.

Modified One‐At‐A‐Time Optimization, Marshall E. Findley

Chemical and Biochemical Engineering Faculty Research & Creative Works

An optimization method has been developed that searches one variable at a time under the conditions that previously searched variables are at their approximate optimum and variables to be searched later are constant. This method provides the optimum and also information on the effects of the variables. The method is based on the Partan and Powell methods and on assuming linear partial derivatives of the objective function with respect to any given variable. The procedure involves searching each variable separately with other variables either constant or varied so that they remain at their estimated optimum for the given conditions. This …

The Anodic Dissolution Of Tin In Acidic Chloride Solutions, James W. Johnson, E. C. Liu

Chemical and Biochemical Engineering Faculty Research & Creative Works

The anodic dissolution of Sn in acidic chloride solutions (pH = -2.0 to 2.9) was studied at 25 °C. The apparent valence of the dissolving ions varied from about 0.4 to 2.4, and was a function of both electrolyte and c.d. The complexing of Sn2+ by Cl- had an important influence, with SnCl-3 apparently being the dominant product. A reaction sequence is proposed involving the stepwise oxidation of Sn, accompanied by reaction with Cl-. © 1974.

Structure Of High-Internal-Phase-Ratio Emulsions, K. J. Lissant, B. W. Peace, S. H. Wu, K. (Kenneth) G. Mayhan

Chemical and Biochemical Engineering Faculty Research & Creative Works

No abstract provided.

Phase Equilibria And Transformations In Potassium Sulfate, Chromate, Molybdate, And Tungstate, Roy Richard Ramey

Doctoral Dissertations

"Thermal expansion and transformations of K₂SO₄, K₂CrO₄, K₂MoO₄, and K₂WO₄ were studied by high temperature diffractometry, differential thermal analysis, and dilatometry. K₂SO₄ and K₂CrO₄ transform from an orthorhombic to a hexagonal structure at 580°C and 670°C respectively, with initiation of the transformation probably related to increased amplitude of S-O tetrahedral vibrations. K₂MoO₄ and K₂WO₄ transform from a monoclinic to an orthorhombic structure at 300° and 370°C respectively. A minor K₂MoO_{4 …}

State-Space Analysis And Synthesis Of Active Rlc Networks, Wen-Pao Lee

Doctoral Dissertations

"This dissertation provides theoretical foundations for the state-space analysis and synthesis of linear active RLC networks containing all four types of controlled sources. The analysis portion is concerned with an explicit representation of the state model and the order of complexity of a general linear active RLC network. The problem considered in the synthesis portion is the realization of a given A-matrix with an active nondegenerate RLC-ladder network or an active RLC network without any particular structure.

The general active RLC network state model representations are explicitly expressed in terms of the fundamental circuit submatrices, the network element submatrices, and …

Comparative Cost Analysis Of Implementing Computer Assisted Instruction On General Purpose Computers, Minicomputers, Or Time-Shared Systems, William Henderson Trueheart Junior

College of Graduate Studies: Theses & Dissertations (1964–2006)

No abstract provided.

On Finding A Minimal Multiple Fault Test Set In Combinational Networks., Dang Quang Tam

Masters Theses

"A simple and systematic approach which generates exactly a minimal multiple fault test set T mm in irredundant combinational networks is presented. It is shown that the Equivalent Sum of Product of a given network contains all the information necessary to determine this minimal test set. The failures which may occur are limited to permanent stuck at O (or 1) faults"-- Abstract, p. ii

The Control Of Noise In Urban Areas., Edwin Eugene Frye Jr.

Masters Theses

"Noise has recently been labeled the 'fourth pollutant' and defined by some as the 'unwanted sound' that pervades our work environments and the privacy of our homes. This concern for noise and its effects has resulted from our nation's increasing population density, the increasing use of mechanized conveniences, the influx and growing use of mass transportation systems, and the public's awareness that noise not only 'annoys' and can increase everyday tensions and anxieties, but at certain levels can cause permanent hearing loss.

In order to curb the 'noise problem' legislators and municipal representatives began applying legal controls to noisy activities …

Minorities Are Not Prepared For Accepting Jobs In The Petroleum And Petrochemical Industries., Freddie Lorace Thompson

Masters Theses

"A survey has been made from nine petroleum and petrochemical companies in the Houston area to get recommendations on the training required for minorities to secure jobs and advance in these industries. Information gathered through this survey consist of the following; (1) recommendations on careers minorities should concentrate their training to secure jobs in these industries; (2) the demand for qualified technical minority graduates far exceeds the supply; (3) a vehicle whereby minorities can be trained and inducted into the petroleum and petrochemical industries; and (4) the companies surveyed are putting forth an honest effort to increase their job mix …

Regional Geological Engineering Mapping By Erts-1 Imagery A Case Study On Taiwan., Shih-Tsu Chen

Masters Theses

"Three types of maps of Taiwan were made by using color composites of ERTS-1 images. The three types of maps, consisting of a regional land use map, an offshore sediment distribution map, and a tectonic map, were made from a color composite imagery utilizing Diazo chrome and Esco chrome films with a planimetrically accuracy sufficient for a 1:1,000,000 scale map.

Color enhanced imagery was found to increase the accuracy level of the land use interpretation. Three color enhancement techniques were used to increase the color contrast between the scenes of different land use. Particular land use scenes required a special …

Esca Characterization Of Flotation Products From A Lead-Zinc-Copper Concentrator On The New Lead Belt Of Southeast Missouri., Kevin Leroy Purdy

Masters Theses

"Electron spectroscopy for chemical analysis (ESCA) was used to determine the surface characteristics of products from an operating Pb-Zn-Cu concentrator on the New Lead Belt of southeast Missouri and pure galena and sphalerite samples treated with flotation reagents in concentrations similar to those used in the mills. The emphasis was on the action of surface modifiers such as Na₂Cr₂O7, starch, SO₂, CuSO₄ and NaCN in sphalerite flotation and in the galena-chalcopyrite separation. The objective of the investigation was to monitor the relative oxidation states of the mineral and reagent constituents and correlate these …

Bidding And Negotiation Of Government Funded Contracts With Inflationary Considerations., David Thurman Hearst

Masters Theses

"The traditional government contract type has played an important role in the economy of the United States. In its most used type, that of fixed price, it represents a stabilizing factor in the cycles of the business world. However, recently this type of contract has been affected by the nation's most recent plague, double-digit inflation.

Inflation attacks almost all phases of stability in the economy and in contract negotiations and bidding techniques. It erodes the monetary unit of the economy, distorts forecasting models, and creates potential ruin for contractors due to uncertainty in costs.

Research pertaining to government funded contracts …

A Multiple-Plan Evaluation Model For Small Ungauged Watersheds, James R. Dexter

Masters Theses

A computer solution model is proposed for simulation of the effect of alternative measures for flood damage reduction. The goal of the model is to optimize the value of an objective function which will maximize the amount of net benefits returned by the project. The evaluation includes unit hydrograph synthesis, direct runoff construction, computation of average annual damages, and optimization of an objective function. A test application of the model is made on a small community affected by floods from a small ungauged stream"--Abstract, page iii.

A Discrete Approach To Surface Interpolation, Jerry Lee Albert Sandvos

Masters Theses

"An equidistant spacing of two dimensional data points is a requirement of most automated analysis routines. In this thesis, a method of generating such equispaced data from randomly spaced data is developed and implemented by a set of computer routines. The method represents the study area as a two dimensional spatial array, in which each array cell represents the data value of a subarea of the study area. A routine sorts and places the data in the array. Missing values in the array are interpolated from nearest neighbors. Filtering is used to smooth errors and a contouring routine is used …

A Digital Simulation Of The Statistical Properties Of Ionospheric Scintillation, William Frederick Deckelman

Masters Theses

"This thesis shows that a bandlimited bivariate-normal time series is a useful model for the envelope of scintillating radio signals traversing the ionosphere. A software computer model is designed and its parameters varied to obtain good fits of the fade duration distribution of the time series generated by the model with that of an actual block of ionospheric scintillation data. The power spectrum of the actual time series corresponding to the in-phase and phase quadrature components of ionospheric scintillation is shown to lie between that of a first- and second-order Butterworth filter through comparison with model generated data"--Abstract, page ii.

An Analysis Of The (N-1,N) Pad ̌Approximant To The Ideal Delay Operator In Terms Of Bessell Functions., Carl Richard Erdmann

Masters Theses

"A realizable, lowpass, non-minimum phase approximation to the ideal distortion less delay operator e^-st₀ is analyzed in terms of the Bessel functions. The characteristics of the first ten members of the approximation are explicitly considered in this paper. The approximation is demonstrated to be realizable for all orders. Amplitude and phase characteristics are described in relation to the ideal delay operator in compact form and in terms of existing ii tabulated functions. Both amplitude and delay bandwidths are characterized by simple and accurate approximations. The maximally flat properties of both amplitude and delay responses are demonstrated. The transient …

On The Extension Of The Output Capabilities Of Flowware, A Graphical Interactive Digital System Simulator., R. Dean Delker

Masters Theses

"A research effort which addresses the problem of providing output from a register transfer level digital simulator which allows the user to better understand how his simulated system functions are described. A review of the output capabilities of existing register transfer level systems indicates that a strictly textual output leaves much to be desired, and for that reason, this work concentrates on developing forms of meaningful graphical output displays. This criterion of "meaningfulness" can be considered as a twofold objective to be reached in that the output must both reflect the functioning of the system and be presented in a …

Design Of A Medium Pressure Hydraulic Coal Mining Machine Power Unit System., William Rudolph Heincker

Masters Theses

"In this thesis the design of the major components of a medium pressure hydraulic coal mining machine is presented. The machine is to produce water jets operating at a continuous pressure of 10,000 psi with a total flow rate of 47.8 gpm. This machine is being used to mine coal from an underground longwall coal face, with an expected output of 7 tons per minute.

The primary elements of the hydraulic coal mining machine are the power source, the pump, the cutting head, and the secondary plow supporting structures. The power source will be a British Jefferey-Diamond (BJD) Supermatic electric …

Effect Of Nodule Count And Cooling Rate On The Matrix Of Nodular Iron., Subrata Sen Gupta

Masters Theses

"The objective of this investigation was to establish the relationship between the nodule count, the matrix structure, and the cooling rate through the eutectoid in nodular iron. The chemical composition of the nodular iron was held constant while various inoculation methods, inoculants, and mold designs, including chills, were used to vary the solidification time and cooling rate through the eutectoid range. This produced variations in both the matrix structure and the nodule count.

The nodule count has a power relationship with the percent pearlite in the matrix at fixed cooling rates: Percent pearlite = K (Nodule count)^-n where the …

High Density Serial Encoded Tape Systems., Billy J. Romine

Masters Theses

"A digital approach to phase lock loop design is presented. Two separate circuits are developed and analyzed. The circuits developed have certain characteristics which can be applied to serial data encoded tape systems. One of the circuits can be expanded into a multiple track configuration with a minimum amount of hardware. The second circuit features a fast initial synchronization method over a wide input frequency range.

The application 0£ the phase lock loops to the retrieval 0£ serial encoded data is investigated. Three representative data encoding methods are considered. The approximate bit density obtainable with each encoding method is calculated …

Liquid Metal Heat Transfer In Longitudinal Flow Along A Cylinder And Flat Plate., Marvin Eugene Lohmann

Masters Theses

"In this investigation an analytical study is performed to determine the effect of axial heat conduction on laminar forced convection for longitudinal flow of liquid metals along a horizontal cylinder and a flat plate. ii

The flow and thermal boundary layers for the problems under consideration do not admit similarity solutions, the non-similarity arising from the transverse curvature; ε = (4/R) (vx/u _∞) ^½ of the cylindrical surface and from co the effect of the axial heat conduction expressible as Ω = 1/Pe_x , where Pe_x is the local Peclet number. The governing conservation equations along with …

Two-Dimensional Radiant Interchange In A Non-Isothermal Cavity Formed By Two Semi-Infinite Parallel Plates., Robert David Allen

Masters Theses

"Two-dimensional radiant interchange between non-isothermal, gray diffuse surfaces with non-uniform radiosity have been investigated for a cavity formed by two semi-infinite parallel plates. The problem is solved for two specific emissive power distribution models. Both emissive power distributions decay exponentially with depth into the cavity. The first emissive power distribution varies in a cosine manner across the front of the plates and the second has a step variation across the front of the plates.

For the cosine varying model, separation of variables and Ambarzumian's method are applied to obtain an integro-differential equation for the radiosity inside the cavity, an integral …

Feasibility Study Of An Electromagnetic Trap Fusion Reactor., Dennis Gilbert Blondin

Masters Theses

"Through the use of detailed particle and energy balances, electromagnetic traps with magnetic cusps are found to be unsatisfactory for continuous operation when using only neutral particle beams to sustain a thermonuclear plasma. Low power multiplication characteristics inherent in this CTR design probably preclude supplemental plasma heating methods. However, by using an alternate Yin-Yang magnetic system, continuous CTR operating regimes are found at an ion temperature of 20 keV while assuming only neutral particle beam heating. Although these regimes require applied electrostatic potentials approaching a half-million volts, this device demonstrates a capability for efficient power production"-- Abstract, p. ii

Application Of An Inverse Heat Conduction Technique To A Simulated Injection Mold., Noel Joy Rytter

Masters Theses

"An analytical model was constructed to investigate the heat transfer in an injection mold for which the temperature was controlled by a special mold heating-cooling process. Several techniques were used to test the validity and accuracy of the analytical model of the mold and to explain some singularities that occurred. It was determined that the thickness of the plastic part being molded is the primary factor affecting the minimum cycle time for the molding operation. Also, abrupt changes in temperature on the molding surfaces are very difficult to obtain because this requires drastic temperature changes for the working fluid that …