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Inverting The Ratio Of The Complex Parallel And Perpendicular Reflection Coefficients Of An Absorbing Substrate Using A Transparent Thin-Film Coating, Rasheed M.A. Azzam

Electrical Engineering Faculty Publications

An absorbing substrate can be coated with a transparent thin film of refractive index N₁ (within a certain range) and thickness d such that the ratio of complex reflection coefficients for the p_and s polarizations of the film-covered substrate ρ = R_p/R_s is the inverse of that of the film-free substrate ρ¯ = R¯_p/R¯_s at an angle of incidence ø. A method to determine the relationship among ø, N₁, and d that inverts ρ (i.e., makes ρ = 1/ρ¯) for a given substrate at a given wavelength is described and is …

Selection Of Sludge Conditioning Chemicals And Filter Media For Vacuum Filter Dewatering Of Sludge At The Atlantic Wastewater Treatment Plant, Douglas W. Fredericks

Civil & Environmental Engineering Theses & Dissertations

A literature review was conducted to determine the types of vacuum filter systems available for sludge dewatering, the characteristics of wastewater sludge which are important to dewatering, and the methods of sludge conditioning for vacuum filtration which are available. Capillary suction time and Buchner funnel tests were performed to determine the dewatering characteristics of sludge conditioned with ferric chloride and lime, polymer, polymer and lime, and polymer and incinerator ash. Filter leaf tests were performed to determine filter cake release characteristics of various conditioned sludge and the performance characteristics of several filter media. It was determined that ferric chloride and …

The Case For A Legislative Solution To Indian Water Claims, James M. Bush

The Federal Impact on State Water Rights (Summer Conference, June 11-13)

57 pages.

Irish H & V News

Building Services Engineering

No abstract provided.

Mathematical Modeling Of Distillation Operation From Non-Equilibrium Approach, Wen-Dow Pan

Dissertations

A new method for mathematical modeling of a distillation operation from non-equilibrium approach has been studied. The primary purpose of the study was to develop a model to simulate the mechanism of mass transfer between a continuous phase and the bubbles of a dispersed phase in a distillation column. The second major purpose of this work was to utilize and test the model of estimating the tray efficiency.

Distillation was considered to be purely a mass transfer process, where the less volatile component is transferred from vapor to liquid phase, and the more volatile component from liquid to vapor phase. …

Deposition Of Suspension In Inclined Channels Due To The Effects Of Inertia, Gravity And Image Force, I-Hsi Chu

Theses

This investigation was made to determine the effect on the deposition of particle in an inclined parallel-plate channel due to the influences of image charge, viscosity, inertia and gravity. The flow considered was lamina, imcompressible and steady. The flow patterns considered were uniform and fully developed with symmetry about the axis of the channel.

The governing equations derived for a particle were based on Newton's Second Law of motion. Since the resulting governing equations are linear second order differential equations, Runge-Kutta algorithm is used to solve the problem and graphical techniques is used to interpret the results of the numerical …

Intelligent Computer Decision Systems, Robert J. Heath

Theses

This paper demonstrates that the concepts developed through Artificial Intelligence research are applicable to computerized information systems; and that a system of expert problem solvers and natural language interfaces exhibiting characteristics of "intelligent behavior" offer several advantages over present-day, conventional database management designs. Development of the conclusion was accomplished after an analysis and assimilation of the current literature in the field of Artificial Intelligence and participation in university symposia concerning its application to the business environment. It is concluded that incorporating the notions of learning and creativity, common sense(heuristics), and self-awareness, intelligent computer decision systems will provide managers with : …

Deposition Of Particles In Cylindrical Chamber Due To The Effect Of Image, Inertia, Viscous And Gravity Forces, Mehul J. Shah

Theses

This study investigated the behaviour of charged particles in cylindrical chambers under the influence of image, inertia, viscous and gravitational forces. The flow was considered to be laminar, steady state and incompressible. The velocity profiles considered were uniform and parabolic with symmetry about the axis of the cylinder.

The governing equations derived were based on Newton's second law of motion. The equations for the case neglecting gravity are linear second order equations and the Runge-Kutta method was used to find a numerical solution. The data hence obtained is fitted to equations using curve fitting method. These equations and graphical techniques …

Risk Assessment For New Products In Office Automation, Dolores Ann Canale

Theses

As investors survey the industrial growth of technology for the late 1980's one area leading the range for large potential growth is the area of office automation. Though this area has been under heavy speculation by many large firms (such as IBM, AT&T and EXXON) for the pass ten years it still remains an unexplored market for many investors. The objective of this research paper is to study the risks companies. will face developing products for this horizon.

Investors believe that success in this area, as well as, many other areas of engineering rely in large measure on the willingness …

Calibration Of Flame Ionization Detector For Chlorinated Hydrocarbons, Nahid Jabalameli

Theses

Relative Responses and Calibration Factors were developed for several volatile organic (mostly chlorinated) priority pollutant species in order to use one single stable compound (e.g.Benzene) for daily instrument calibration. This would replace the procedure of using a standard mixture of target compounds (25-35). This is of particular advantage because the standard mixture may not have all species stable or may show loss of some components relative to others due to wall adsorption in the standard (compressed gas) stainless steel cylinder.

The use of a single standard species was made possible by developing "accurate" relative response and calibration factors of all …

Time Dependent Limit Stability Of Tunnel And Dam Engineering In Difficult Rocks, Tan Tjong Kie

International Conference on Case Histories in Geotechnical Engineering

Some representative case histories of the damage of tunnels and galleries in weak fissured swelling rock formations with low competency ratios are described; a rheological analysis and suggestions for the design are presented. The basic ideas underlying the design and construction of the Ghe Zou Ba dam, founded on horizontal layers of sand-and mudstones interbedded by thin clay sheets are reported. In all such cases the time factor is important.

Combined Earth And Rock Bearing Foundation - Hospital Humana Mexico City D.F., Michael R. Stomer, Pablo Girault, L. E. Wilson

International Conference on Case Histories in Geotechnical Engineering

This text describes the design and performance of a shallow spread footing foundation system for a large medical care facility in Mexico City. The project is unusual because the spread footings bear on a combination of basaltic lava and coarse sand fill containing angular lava fragments, the latter of which was densified using the dynamic deep compaction process. In the following narrative, the exploratory program is described, the geotechnical design and construction process is explained, and the inspection procedure for footings bearing on rock and soil is discussed. Further, the results of precise settlement monitoring for the structure are presented.

Vibration Studies Of Block Type Machine Foundations, S. K. Guha

International Conference on Case Histories in Geotechnical Engineering

Detailed vibration measurements were undertaken at eight block type machine foundations with different supporting soil conditions. These extensive measurements were supplemented by theoretical vibration calculations using principally Barkan's method but, at times, using methods of Reissner, Pauw, Richart and Ford and Haddow. The results of prototype experiments and theoretical studies on various compressor foundations described above as also on similar foundations in the country justify broadly the validity of various theories, particularly Barkan’s method, though these are based on somewhat different concepts. Design criteria for foundations are generally described in terms of limiting values of amplitudes of displacement at the …

Study Of Vibration In Site Selection For A Precision Instrument Factory, Pan Fulan

International Conference on Case Histories in Geotechnical Engineering

Antivibration is an important consideration in site selection for setting up a precision instrument factory. Any negligence to this could bring to the future production a great deal of trouble, as that the measurement will be inaccurate, the precision of products will not be up to the requirements, the instruments and meters will be damaged. In this paper, case histories in selection of site of the factory are described briefly. Then based on the site tests and wave theory, the formula for calculating the attenuation of amplitude, the principles for selecting the site of a factory and the necessary distances …

Performance Of A Stone Column Supported Embankment, R. R. Goughnour, R. D. Barksdale

International Conference on Case Histories in Geotechnical Engineering

The proposed expansion of ramps connecting Interstate Route 664 with Interstate Route 64 at Hampton, Virginia involved numerous high embankments and bridge structures over marshlands. Potential problems of embankment stability and excessive long term, post construction settlements were further complicated by very strict environmental constraints on acceptable construction methods. The solution chosen was stabilization of the in situ soils by the installation of stone columns. A description is given of stone column design, construction, field embankment instrumentation, and embankment performance for the first two years of operation. Four theories for predicting settlements of stone column reinforced ground are briefly reviewed. …

The Use Of Limited Field Observation In Remedial Design, J. P. Sully, G. I. Mcphail

International Conference on Case Histories in Geotechnical Engineering

As a consequence of a slope failure, an investigation was carried out to determine the present and future stability of a gold tailings dam in the Orange Free State, South Africa. Recommendations were also required concerning the type of remedial measure(s) necessary in order to permit continued deposition of the tailings waste product on the dam. The field and laboratory investigation involved sampling of the tailings and foundation soils and installation of piezometers at various locations around the dam. The paper describes how, using data obtained from a limited monitoring period, evaluation of in-situ parameters enabled prediction of future phreatic …

General Report For Theme Six – Case Histories In Machine Foundations, Richard D. Woods

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Squeezing Problems In Indian Tunnels, J. L. Jethwa, A. K. Dube, B. Singh, Bhawani Singh

International Conference on Case Histories in Geotechnical Engineering

Case histories of three Indian tunnels indicate that squeezing conditions are created due to plastic flow of rock masses under the influence of high cover pressures. These examples emphasize that a tunnel experiencing squeezing conditions must be allowed to deform to optimize support costs and avoid delays. Allowance for desirable tunnel deformations must, therefore, be made while planning the size of excavation.

Field data has shown that a flexible support system of compressible backfill and steel ribs may be used as an alternative to shotcrete support which is unpractical in Indian tunnels excavated largely by conventional methods. Instrumentation indicates that …

Stillwater Tunnel, Central Utah Project, Utah - Case History, R. S. Sinha, K. D. Schoeman

International Conference on Case Histories in Geotechnical Engineering

Described is the case history of Stillwater Tunnel highlighting the aspects of design, construction, instrumentation, and contracting procedures, which on September 14, 1983, culminated in the successful holethrough for this 8.03-mile (12.92-km) long water conveyance tunnel. The case study demonstrates that for a successful project it is essential to carefully select a ·compatible excavation system and a contractor who has the incentive to complete the project within the resources of available time and budget. The study illustrates the weaknesses in the current state of the technology for design and construction of deep and long tunnels and urges an improvement of …

Case Histories For Today's Geotechnique, R. B. Peck

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Welcoming Remarks, Shamsher Prakash, John T. Park, Joseph H. Senne

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Settlement Observations On Two Mat Foundations, E. Winter, P. Chung

International Conference on Case Histories in Geotechnical Engineering

The performance of two mat foundations is examined. The first case history includes a mat founded over generally granular terrace soils, underlain by a deep clay layer of medium compressibility. The second case history includes a mat over stiff preconsolidated clay. The mats are analyzed based on laboratory test and field pressuremeter data using the Winkler method. The particular approach taken in the analysis includes the determination of the modulus of subgrade reaction for the design using Vesic's method. Vesic (1968). This calculation was developed for pavements but is based on the theory of plates on elastic media which applies …

An Embankment On Soft Clays With Sand Drains Numerical Characterization Of The Parameters From In-Situ Measurements, A. Cancelli, A. Cividini

International Conference on Case Histories in Geotechnical Engineering

The deformation parameters of a soft lacustrine deposit, with vertical sand drains, are evaluated by means of field measurements obtained during and after the construction of a railway embankment. The geotechnical system, modelled as linearly elastic and in plane strain, is analyzed by means of the finite element method and the estimation problem is solved adopting a Bayesian approach. The experimental data, the "a priori" estimation of the parameters and their uncertainties are considered in the back-analysis. The results provide the "optimal" values of the parameters, a measure of their uncertainties and, consequently, an index of the effectiveness of the …

Acuta Enews May 1984, Vol. 13, No. 5

ACUTA Newsletters

In This Issue

President's Message

Party Line

BOCs Revamp Centrex Service To Vie With PBXs

Communications Gear Showcased For L.A. Olympics

AT&T: A Period of Adjustment

Lincoln Tel Tackles First Light guide Job

Court: Cops Can Tape Cordless Talk

Spring 1984, Wmpg 90.9 Fm

WMPG Program Guides

WMPG program guide for Spring 1984

Includes notes from Program Director, information on shows and events, and schedule.

Irish H & V News

Building Services Engineering

No abstract provided.

Irish H & V News

Building Services Engineering

No abstract provided.

Irish H & V News

Building Services Engineering

No abstract provided.

Fall 1984, 90.9 Wmpg Fm

WMPG Program Guides

No abstract provided.

Summer 1984, 90.9 Wmpg Fm

WMPG Program Guides

WMPG Program Guide, Summer 1984,