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Articles 1801 - 1830 of 2079

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An Adaptive Differencing Scheme For Elliptic Flows., Therese Estelle Rhodes Jan 1991

An Adaptive Differencing Scheme For Elliptic Flows., Therese Estelle Rhodes

LSU Historical Dissertations and Theses

This thesis deals with the formulation of a computationally efficient multiple-grid adaptive differencing (MAD) scheme for two-dimensional elliptic flow and heat transfer problems. This algorithm equidistributes a measure of the error by using higher order differencing schemes locally in adaptively determined high error-estimate regions. The third-order accurate QUICK scheme is used in regions of high error estimate which are dynamically flagged on the basis of a preliminary first order upwind solution. Boundary conditions for the flagged regions are taken from the preliminary upwind solution. Multigrid type calculations are performed. Three multiple-grid schemes are developed. In the first scheme, MAD1-WFDS, the …

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Linear Programming By G.V. Shenoy, New Delhi: Wiley Eastern Limited, 1989., A K Rao Dec 1990

Linear Programming By G.V. Shenoy, New Delhi: Wiley Eastern Limited, 1989., A K Rao

IIMB Management Review

No abstract provided.

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Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, November 1990, College Of Engineering And Computer Science, Wright State University Nov 1990

Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, November 1990, College Of Engineering And Computer Science, Wright State University

BITs and PCs Newsletter

A ten page newsletter created by the Wright State University College of Engineering and Computer Science that addresses the current affairs of the college.

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Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, October 1990, College Of Engineering And Computer Science, Wright State University Oct 1990

Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, October 1990, College Of Engineering And Computer Science, Wright State University

BITs and PCs Newsletter

An eight page newsletter created by the Wright State University College of Engineering and Computer Science that addresses the current affairs of the college.

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Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, September 1990, College Of Engineering And Computer Science, Wright State University Sep 1990

Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, September 1990, College Of Engineering And Computer Science, Wright State University

BITs and PCs Newsletter

An eight page newsletter created by the Wright State University College of Engineering and Computer Science that addresses the current affairs of the college.

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Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, May 1990, College Of Engineering And Computer Science, Wright State University May 1990

Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, May 1990, College Of Engineering And Computer Science, Wright State University

BITs and PCs Newsletter

A four page newsletter created by the Wright State University College of Engineering and Computer Science that addresses the current affairs of the college.

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Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, April 1990, College Of Engineering And Computer Science, Wright State University Apr 1990

Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, April 1990, College Of Engineering And Computer Science, Wright State University

BITs and PCs Newsletter

An eight page newsletter created by the Wright State University College of Engineering and Computer Science that addresses the current affairs of the college.

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Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, March 1990, College Of Engineering And Computer Science, Wright State University Mar 1990

Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, March 1990, College Of Engineering And Computer Science, Wright State University

BITs and PCs Newsletter

A sixteen page newsletter created by the Wright State University College of Engineering and Computer Science that addresses the current affairs of the college.

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Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, February 1990, College Of Engineering And Computer Science, Wright State University Feb 1990

Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, February 1990, College Of Engineering And Computer Science, Wright State University

BITs and PCs Newsletter

An eight page newsletter created by the Wright State University College of Engineering and Computer Science that addresses the current affairs of the college.

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Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, January 1990, College Of Engineering And Computer Science, Wright State University Jan 1990

Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, January 1990, College Of Engineering And Computer Science, Wright State University

BITs and PCs Newsletter

A fourteen page newsletter created by the Wright State University College of Engineering and Computer Science that addresses the current affairs of the college.

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Determination Of Diffusion And Adsorption Coefficients For Some Contaminants In Clayey Soil And Rock: Laboratory Determination And Field Evaluation, Frank S. Barone Jan 1990

Determination Of Diffusion And Adsorption Coefficients For Some Contaminants In Clayey Soil And Rock: Laboratory Determination And Field Evaluation, Frank S. Barone

Digitized Theses

A laboratory diffusion test determination of diffusion coefficient (D) and adsorption coefficient (K{dollar}\sb{lcub}\rm d{rcub}{dollar}) for various inorganic and organic species in a saturated, undisturbed, clayey soil is presented. Diffusion tests conducted for inorganic species (Cl{dollar}\sp-{dollar}, Na{dollar}\sp+{dollar}, K{dollar}\sp+{dollar}, Mg{dollar}\sp{lcub}2+{rcub}{dollar}, and Ca{dollar}\sp{lcub}2+{rcub}{dollar}), involved placing domestic landfill leachate on top of a layer of clay and allowing the chemical constituents to diffuse into the soil. The mathematical model "POLLUTE" was then used to back-figure (D) and (K{dollar}\sb{lcub}\rm d{rcub}{dollar}) for each species by fitting: (1) the variation in species concentration with time in the source leachate, and (2) the variation in pore water concentration …

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The Transport And Fate Of Chromium(Vi) In Deep Well Disposal Zone., Jaehyuk Hyun Jan 1990

The Transport And Fate Of Chromium(Vi) In Deep Well Disposal Zone., Jaehyuk Hyun

LSU Historical Dissertations and Theses

Several parameters affecting the behavior of Chromium(+VI) in deep well injection zones were studied. Temperature, pH, concentration of inorganic salt in wastewater, and organic chemicals co-injected with wastewater were considered as they affect the adsorption and reduction rates of Cr(VI). Water content, bulk density of shale and sand, and temperature were examined for their effect on the diffusion rate of Cr(VI) in porous media. Adsorption and reduction of Cr(VI) were investigated using three clays, Na-Montmorillonite, Illite, and Kaolinite, and sand from an injection well formation in southern Louisiana, and a confining layer shale obtained from a second Louisiana injection well. …

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Diffusivity Estimation For Counterdiffusing Reactants In Catalytic Solids., Chauchyun Chang Jan 1990

Diffusivity Estimation For Counterdiffusing Reactants In Catalytic Solids., Chauchyun Chang

LSU Historical Dissertations and Theses

The diffusivities of molecules whose sizes approach the intracrystalline pore sizes of zeolites have been studied at and near conditions prevailing during catalysis, by both desorption and kinetics techniques. For the desorption approach, a series of unary isothermal desorption experiments (following an almost instantaneous initial temperature rise) were conducted for toluene or benzene with five different zeolites. Diffusion and readsorption are shown to control the process. The intracrystalline diffusivities (D$\sb{\rm e}$) were derived by fitting the desorption curves with four models of varying complexity; only models which take into account readsorption (either at equilibrium or not) can both fit the …

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University Of Texas At Tyler Catalog, 1990-1992, University Of Texas At Tyler Jan 1990

University Of Texas At Tyler Catalog, 1990-1992, University Of Texas At Tyler

Catalogs

This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. In addition, no permission is required from the rights-holder(s) for educational uses. For other uses, you need to obtain permission from the rights-holder(s).

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Analysis For Creep, Shrinkage And Temperature Effects On Expansion Joint Movements In Composite Prestressed Concrete Bridges., Keith Joseph Rebello Jan 1990

Analysis For Creep, Shrinkage And Temperature Effects On Expansion Joint Movements In Composite Prestressed Concrete Bridges., Keith Joseph Rebello

LSU Historical Dissertations and Theses

A rigorous and efficient analytical model to predict the long-term deformation behavior of bridges with multiple, precast, pretensioned, prestressed concrete girders supporting cast-in-place-concrete deck slabs, was developed. The analytical procedure uses the finite element method with three-dimensional 20-node isoparametric elements to realistically model bridge geometry. Time dependent effects due to load and temperature history, creep, shrinkage and aging of concrete are included in the analysis. Creep and shrinkage strains are evaluated at different times using the more commonly used procedures, namely, the ACI-209, Bazant-Panula II and CEB-FIP procedures. Temperature strains are calculated from an assumed typical bridge temperature distribution based …

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An Adaptive Control System For Biological And Robotic Simulations., Sunggyu Kwon Jan 1990

An Adaptive Control System For Biological And Robotic Simulations., Sunggyu Kwon

LSU Historical Dissertations and Theses

An adaptive control algorithm based on Albus' CMAC (Cerebellar Model Articulation Controller) was studied with emphasis on how to build a Multilayered CMAC Control System. This concept has been devised to circumvent the excessive memory requirements of CMAC controllers for complex control systems with many inputs. The Neighborhood Sequential Training technique was devised as a general CMAC training technique. This training technique is straightforward to implement and well matched to CMAC's memory generalization. A two-layered CMAC control module was simulated for a six dimensional CMAC problem of trajectory control for a six degree of freedom manipulator. Layering was accomplished by …

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A Rock-Plant Filter Bench-Scale Study And Computer Model., Donna Gail Skipper Jan 1990

A Rock-Plant Filter Bench-Scale Study And Computer Model., Donna Gail Skipper

LSU Historical Dissertations and Theses

In Part One, three bench-scale rock filters containing 2 feet of gravel were investigated. Two of the filters were planted with Sagittaria lancifolia and Scirpus validus, while the third filter was an unvegetated control filter. During a preliminary portion of this study, the BOD$\sb5$ surface loading was held constant at 4.96 g/day/m$\sp2$. The BOD$\sb5$ mass removal percentages at this time averaged 75%, 60%, and 44% for the Scirpus, Sagittaria, and control systems, respectively. Following this constant loading rate, an 80-day experiment was run on the filters using eight combinations of two flow rates and four influent BOD$\sb5$ concentrations, each combination …

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The Combustion Of Linear Droplet Arrays In A Coaxial Convective Flow., Jeng-Syan Tsai Jan 1990

The Combustion Of Linear Droplet Arrays In A Coaxial Convective Flow., Jeng-Syan Tsai

LSU Historical Dissertations and Theses

As approximations for spray-combustion processes, a series of increasingly sophisticated numerical models has been developed to simulate the combustion of linear droplet arrays in a co-axial, convective flow. Common to all of the models is an embedded grid, developed to increase computational accuracy. The first and simplest model is potential flow model (for Re $\to$ $\infty$). The flow is assumed to be ideal and infinitely-fast kinetics (flame sheet assumption) represent the combustion. The results show that the instantaneous droplet burning rates are increased as the droplet spacing is increased, and the burning rates of droplets tend asymptotically to smaller values …

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Probabilistic Analysis Of Bridge Scour Using The Principle Of Maximum Entropy., Donald Edward Barbe' Jan 1990

Probabilistic Analysis Of Bridge Scour Using The Principle Of Maximum Entropy., Donald Edward Barbe'

LSU Historical Dissertations and Theses

The probability distribution function for floods and velocity profile in open channel flow are combined with scour theory to present a procedure for determining the risk of bridge failure due to scour. This is accomplished by deriving a probability distribution function for scour at a bridge pier. The theory of entropy and the principle of maximum entropy are used to determine the velocity profile. The constraints used in the entropy maximization are derived from the physical laws of conservation of mass, momentum, and energy. A procedure to approximate the solution to the resulting equations is shown. The vertical velocity is …

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A New Approach To Analyzing High-Resolution Aerial Photographs Of Urban Areas., Timothy Dwayne Phillips Jan 1990

A New Approach To Analyzing High-Resolution Aerial Photographs Of Urban Areas., Timothy Dwayne Phillips

LSU Historical Dissertations and Theses

This dissertation proposes a new approach for analyzing high resolution aerial photographs of urban areas. Analyzing aerial photographs is the process of constructing an overall description of a scene. It involves knowledge of visual sensors, computing systems, artificial intelligence, software engineering, and perceptual psychology. Researchers have had only limited success in this area. This dissertation considers a high level analysis approach. Most aerial photograph interpretation systems concentrate on analyzing an airport, roadway, or urban scene. Those systems, however, do not explain how they know they were examining such a scene. This dissertation concentrates on how to reach that point. It …

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Decontamination Of Soil Using Electro-Osmosis., Jihad Tawfiq Hamed Jan 1990

Decontamination Of Soil Using Electro-Osmosis., Jihad Tawfiq Hamed

LSU Historical Dissertations and Theses

Electrokinetic soil processing is an innovative insitu technique to remove contaminants from soils and groundwater. The process is an alternative to conventional processes, with significant economic and technical advantages. A theory is presented for pH gradient development by diffusion and convection in electrokinetic processing of soils. The premises and consequences of the theory are discussed. Based upon this theory, a mathematical model is developed to predict the pH gradient development in electro-osmosis. Electro-osmosis tests are conducted on saturated kaolinite specimens loaded with Pb(II), Cd(II), and Cr(III) to investigate the feasibility, efficiency, and energy requirements of the process in removal of …

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Effects Of Rock/Cutter Friction On Pdc Bit Drilling Performance: An Experimental And Theoretical Study., Ergun Kuru Jan 1990

Effects Of Rock/Cutter Friction On Pdc Bit Drilling Performance: An Experimental And Theoretical Study., Ergun Kuru

LSU Historical Dissertations and Theses

A new mechanistic drilling model for PDC bits was derived from the balance of forces acting at the PDC cutter. The model combined the torque and the drilling rate equations, cutter's geometry and rock properties. A new understanding of frictionally generated heat between rock and PDC cutter is introduced. The numerical analysis revealed that neglecting the heat generated at the cutting surface area results in underestimation of the actual wearflat temperature by 10% to 530%, depending upon bit dull and downhole hydraulics. The example bit performance comparison made by calculating the MBP curves showed 18% reduction of drilling rate when …

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Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, November 1989, College Of Engineering And Computer Science, Wright State University Nov 1989

Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, November 1989, College Of Engineering And Computer Science, Wright State University

BITs and PCs Newsletter

A sixteen page newsletter created by the Wright State University College of Engineering and Computer Science that addresses the current affairs of the college.

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Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, October 1989, College Of Engineering And Computer Science, Wright State University Oct 1989

Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, October 1989, College Of Engineering And Computer Science, Wright State University

BITs and PCs Newsletter

A fourteen page newsletter created by the Wright State University College of Engineering and Computer Science that addresses the current affairs of the college.

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Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, September 1989, College Of Engineering And Computer Science, Wright State University Sep 1989

Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, September 1989, College Of Engineering And Computer Science, Wright State University

BITs and PCs Newsletter

A twelve page newsletter created by the Wright State University College of Engineering and Computer Science that addresses the current affairs of the college.

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On-Farm Reservoir Construction In The Grand Prairie Region Of Arkansas: An Engineering Economic Analysis, Jayson K. Harper, Richard C. Peralta, Robert N. Shulstad Jun 1989

On-Farm Reservoir Construction In The Grand Prairie Region Of Arkansas: An Engineering Economic Analysis, Jayson K. Harper, Richard C. Peralta, Robert N. Shulstad

Civil and Environmental Engineering Faculty Publications

No abstract provided.

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Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, May 1989, College Of Engineering And Computer Science, Wright State University May 1989

Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, May 1989, College Of Engineering And Computer Science, Wright State University

BITs and PCs Newsletter

A ten page newsletter created by the Wright State University College of Engineering and Computer Science that addresses the current affairs of the college.

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Applications Of The Calculus For Factorial Arrangements And Allied Topics., Mausumi Bose Dr. Mar 1989

Applications Of The Calculus For Factorial Arrangements And Allied Topics., Mausumi Bose Dr.

Doctoral Theses

This thesis deals primarily with the application of the calculus for factorial ar- rangements (Kurkjian and Zelen (1962, 1963)) to various designs. The thesis has been divided into six chapters. We have made extensive use of Kronecker products and various other results from matrix theory. The results in the first two chapters involve the use of projection operators.In the first four chapters, different classes of factorial experiments have been studied by applying the calculus. Chapter 5 deals with another class of designs called repeated measurements designs (RMD's). It has been shown that the calculus for factorial arrangements serves as a …

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Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, March 1989, College Of Engineering And Computer Science, Wright State University Mar 1989

Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, March 1989, College Of Engineering And Computer Science, Wright State University

BITs and PCs Newsletter

A ten page newsletter created by the Wright State University College of Engineering and Computer Science that addresses the current affairs of the college.

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Connections On Small Vertex Model., R. Srinivasan Dr. Feb 1989

Connections On Small Vertex Model., R. Srinivasan Dr.

Doctoral Theses

This thesis is devoted to the classification of a special class of commuting squares called vertex models.The first chapter is indroductory in nature and is included for the sake of completeness and convenience of reference. It starts with the description of the basic construction and the invariants called the principal and dual graph for an inclusion of II1, factors. After defining a commuting square we describe the special class of commuting squares called vertex model given by an Mn, O Mk, biunitary matrix . Finally we state some results, without proof, about vertex nodels from (KSC).The second chapter in the …

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