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1991

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Articles 631 - 660 of 1363

Full-Text Articles in Engineering

An Architecture Level Simulation Methodology, Paul D. Stigall, Ram Huggahalli Apr 1991

An Architecture Level Simulation Methodology, Paul D. Stigall, Ram Huggahalli

Electrical and Computer Engineering Faculty Research & Creative Works

Using the Architecture Design and Assessment System (ADAS), the Processor Level Architecture of an Example Computer System is First Represented as a Directed Graph. Then, a Method of Simulating Instruction Execution as a Sequence of Data Transfers between the Nodes of the Graph is Presented. the Simulation Methodology Provides Flexibility in Observing the Architecture Dynamically at the Processor Level. an Example Application for Functional Verification is Discussed. Development of Techniques to Convert Programs into Node Sequences And, to Assign Appropriate Delays to the Nodes is Necessary to Further Enhance the Applicability of the Methodology. Functional Verification and Performance Estimation through …

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Indiana Model Zoning Ordinance, T. William Patterson Apr 1991

Indiana Model Zoning Ordinance, T. William Patterson

Indiana Local Technical Assistance Program (LTAP) Publications

This HERPICC model is intended as a basis for helping Indiana counties, cities, and towns to write or revise local regulatory ordinances. Having such a model is especially urgent because field trips taken throughout the state have revealed that many jurisdictions are vulnerable to lawsuits because their ordinances are out of date and do not conform to the current provisions of the Indiana Code. This situation is made more serious by the lack of adequate professional planning staff or consultants available to local governments. Many may have received inaccurate advice from their attorneys. Too often, attorneys are not familiar enough …

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Magneto-Optical Kerr Effect And Perpendicular Magnetic Anisotropy Of Evaporated And Sputtered Co/Pt Multilayer Structures, Ping He, William A. Mcgahan, John A. Woollam, F. Sequeda, T. Mcdaniel, H. Do Apr 1991

Magneto-Optical Kerr Effect And Perpendicular Magnetic Anisotropy Of Evaporated And Sputtered Co/Pt Multilayer Structures, Ping He, William A. Mcgahan, John A. Woollam, F. Sequeda, T. Mcdaniel, H. Do

Department of Electrical and Computer Engineering: Faculty Publications

Thin and ultrathin Co/Pt multilayered structures have been prepared on glass substrates by electron-beam evaporation at room temperature and by sputtering at various substrate temperatures and sputtering pressures. Perpendicular magnetic anisotropy was found in samples with Co/Pt bilayer thicknesses near 3 Å/l0 Å and total thicknesses of the layer stack of no greater than 300 Å. X-ray diffraction was performed on the samples to determine layer spacing and integrity, and possible crystallinity of films. Crystalline structures in the interface between the Co and Pt layers were found and identified. The effects of sputtering parameters, such as pressure and substrate temperature, …

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Phase Changes In Plasma‐Sprayed Zinc‐Nickel Ferrite, T. A. Dooling, Desmond C. Cook Apr 1991

Phase Changes In Plasma‐Sprayed Zinc‐Nickel Ferrite, T. A. Dooling, Desmond C. Cook

Physics Faculty Publications

The magnetic and crystalline properties of a plasma‐sprayed coating of the microwave absorbing zinc‐nickel ferrite, (Zn0.41Ni0.59 )Fe2O4 have been studied at 300 K using the Mössbauer effect and x‐ray diffraction (XRD). Both techniques indicate that the plasma‐sprayed material separated into two phases. The first is a nickel‐rich phase with magnetic fields of 47.5 and 44.5 T at the tetrahedral and octahedral sites, respectively. The second is a zinc‐rich phase, zinc meta‐ferrite, having a small magnetic field of 4.2 T. The quadrupole splitting of this second phase is ΔE=0.34 mm s−1, …

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Thermal Compatibility Analysis Of The Passive Damping Treatment Proposed For The Space Shuttle Remote Manipulator System (Srms), Mahesh Chowdhary Apr 1991

Thermal Compatibility Analysis Of The Passive Damping Treatment Proposed For The Space Shuttle Remote Manipulator System (Srms), Mahesh Chowdhary

Mechanical & Aerospace Engineering Theses & Dissertations

The NASA Space Shuttle Remote Manipulator System (SRMS), due to its long reach and light weight construction has significant structural flexibility. Thus any routine use of SRMS often results in large amplitude oscillations with long settling time. A passive damping technique utilizing a constrained viscoelastic layer damping treatment has been proposed to augment the active control of these oscillations in order to enhance the system stability and the end effector positional accuracy. This thesis concerns with the thermal compatibility analysis of the proposed damping treatment. The necessity for thermal compatibility analysis arises from the fact that acceptable damping performance of …

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Monte Carlo Simulation Of Millimeter-Wave Gunn Effect Oscillators, Ramani Vaidyanathan Apr 1991

Monte Carlo Simulation Of Millimeter-Wave Gunn Effect Oscillators, Ramani Vaidyanathan

Electrical & Computer Engineering Theses & Dissertations

Monte Carlo simulations have been carried out to investigate the performance of microwave Gunn oscillators. Three separate aspects of the simulation problem have been comprehensively addressed in this work. First, the presence of an external circuit has been self-consistently incorporated into the calculations. The inclusion of the external circuit facilitates a study of the circuit controlled regime, and correctly models effects arising from the time dependent boundary conditions. Secondly, microscopic details of the electronic relaxation mechanisms which ultimately control the frequency response limits, have been taken into account through an iterative Monte Carlo-Poisson scheme. This procedure overcomes a potential shortcoming …

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Method For Compression Molding Articles From Lignocellulosic Materials, Robert D. Palardy, Bruce A. Haataja, Andrew D. Williams Mar 1991

Method For Compression Molding Articles From Lignocellulosic Materials, Robert D. Palardy, Bruce A. Haataja, Andrew D. Williams

Michigan Tech Patents

Flakeboard or particle board panels and other composite articles made from wood flakes or other particulate lignocellulosic materials having a relatively high internal bond and improved resistance to moisture are made from flakes or particles which have a moisture content of at least 15%. A catalyst capable of accelerating the reaction between the flakes or particles, the binder and water is applied to the flakes or particles prior to the addition of a moisture-tolerant particle board binder, such as an organic polyisocyanate. A mat of the resulting furnish is compression shaped under pressure and at a temperature less than 250° …

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Afit/Afosr Symposium On Applications Of Wavelets To Signal Processing, Volume Ii, Tutorial Notes, Gregory T. Warhola, Mark E. Oxley, Steven K. Rogers, Matthew Kabrisky, Bruce W. Suter Mar 1991

Afit/Afosr Symposium On Applications Of Wavelets To Signal Processing, Volume Ii, Tutorial Notes, Gregory T. Warhola, Mark E. Oxley, Steven K. Rogers, Matthew Kabrisky, Bruce W. Suter

AFIT Documents

The Air Force Institute of Technology (AFIT) hosted the Symposium on Applications of Wavelets to Signal processing during 20-22 March 1991 at the AFIT Science and Research Center, Wright-Patterson AFB, OH. This was the first major academic meeting of its kind held at AFIT. The symposium was sponsored by the Air Force Office of Scientific Research (AFOSR), Bolling AFB, DC. It focused on applications of wavelets to problems in image and speech processing, communications, and graphics and opened with a one-day short course, 'A Tutorial on Wavelets.' The symposium was attended by more than 220 researchers worldwide. They represented 15 …

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Transient Heat Transfer Measurements On A Film Cooled Flat Plate In A Shock Tube, Rakhman Gul Mar 1991

Transient Heat Transfer Measurements On A Film Cooled Flat Plate In A Shock Tube, Rakhman Gul

Theses and Dissertations

During this study a simple model of a flat plate was chosen to determine heat flux from a high speed flow behind a shock wave into the film cooled flat plate. An electrical analog was used to convert the output of the heat flux gages into heat flux. Free stream turbulence within the flow behind the shock wave and that generated by a turbulence generator was determined and its effects on the heat transfer data were then studied for comparison with previous experimental work. The thin-film heat flux gages were calibrated and their calibration constants were then used to determine …

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Computation Of Dynamic Large Displacements In Earth Systems, Mohamed Fadel Succarieh, Jerry I. Lin, Ahmed-Waeil M. Elgamal Mar 1991

Computation Of Dynamic Large Displacements In Earth Systems, Mohamed Fadel Succarieh, Jerry I. Lin, Ahmed-Waeil M. Elgamal

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

A model for the computation of seismically induced permanent displacements is earth structures are proposed. This model allows relative sliding between different zones of the structure under investigation. Large displacements are allowed between these zones. Elasto-plastic constitutive soil behavior is accounted for. An updated Lagrangian Jaumann Finite Element formulation is used. The proposed model is used to predict the observed behavior of LaVillita Dam during the November 15, 1975 earthquake.

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A Variational Formulation For Classical Models Of The Slope Stability With Earthquake Effect, Petr Koudelka, Petr Procházka Mar 1991

A Variational Formulation For Classical Models Of The Slope Stability With Earthquake Effect, Petr Koudelka, Petr Procházka

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The paper deals with an extension of application of the Method of Apriori Integration to a model of a general slope, which is partly homogeneous and which is loaded also by the earthquake effect. The most dangerous direction of the power effect of the vibration is shown and for this direction the change of safety factor is discussed. The effect of reduced shear strength is included.

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Consideration Of Earthquake Damage To Earth Dam For Irrigation In Japan, Shigeru Tani Mar 1991

Consideration Of Earthquake Damage To Earth Dam For Irrigation In Japan, Shigeru Tani

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

There are many small earth dams for irrigation called "TAMEIKE" in Japan, Most of them were constructed before modern soil engineering were established on the basis of empirical techniques. Earthquakes in the past gave much damage to these earth dams. This paper surveys damage of earthquake for those remaining on records again, and as for Nipponkai-Chubu Earthquake, detailed investigations such as in-situ test, laboratory test, analysis were made to clarify causes of the damage to earth dams. From the result of survey, the following matters were found; i.e., large damages occur at a high rate on earth dams whose foundation …

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Displacements Of Slopes Under Earthquake Loading, L. J. L. Lemos, P. A. L. F. Coelho Mar 1991

Displacements Of Slopes Under Earthquake Loading, L. J. L. Lemos, P. A. L. F. Coelho

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The displacements and rates of displacement of slopes post-rupture are influenced by the dynamic response of soils. Pre-existing shear surfaces at or close to residual strength are frequently present in slopes of clay and weak mudstone, due to previous slope movement or tectonic disturbance. Knowledge of the strength of such surfaces under rapid loading is necessary of stability during and after an earthquake is to be examined. To obtain such data, high speed displacement controlled ring shear tests have been performed, on samples after being pre-sheared to residual conditions. With the results from those tests, suitable constitutive laws were derived …

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Dynamic Response Of Earth Dam-Foundation System, Lin Gao, Guan Fei Mar 1991

Dynamic Response Of Earth Dam-Foundation System, Lin Gao, Guan Fei

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

A numerical procedure is proposed to analyze the seismic response of structure resting on layered medium. By this approach the effects of the dynamic soil-structure interaction (DSSI) upon the response of earth dam on multi-layered half space subjected to seismic ground motions are studied. The dynamic responses of earth dams on rigid base are also evaluated to compare with those on a flexible homogenous half space. It is noted that great differences may arise between the results of the two cases. To investigate the influence of the truncated size of foundation in horizontal direction on the dynamic response of the …

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Effects Of Earthquake Induced Liquefaction Of Sediments Stored Behind Concrete Dams, Peter M. Byrne, Li Yan, T. Srithar Mar 1991

Effects Of Earthquake Induced Liquefaction Of Sediments Stored Behind Concrete Dams, Peter M. Byrne, Li Yan, T. Srithar

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Earthquake induced liquefaction of sediment stored behind dams can give rise to high uplift pressures which could endanger their safety. The uplift pressures depend upon the permeability and compressibility of both the sediment and the foundation and are controlled by Biot's equation. Uplift pressures are computed for a single dam and foundation with a range of properties. The results show that for the conditions analyzed, the uplift pressures are largely controlled by the foundation permeability with the largest uplift pressures occurring for the highest foundation permeability. The possibility of liquefied sediment flowing into fissures in the foundation rock is also …

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Inelastic Seismic Response Of San Fernando And Santa Felicia Dams, Elsa Stara-Gazetas, Ricardo Dobry Mar 1991

Inelastic Seismic Response Of San Fernando And Santa Felicia Dams, Elsa Stara-Gazetas, Ricardo Dobry

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

A simplified method of inelastic seismic analysis of earth dams developed by the authors is used to study the response of the San Fernando and Santa Felicia dams to accelerograms recorded in the 1971 San Fernando Earthquake. The method involves two separate stages. In stage I, the dam is discretized into finite elements and is subjected to horizontal static inertia-like forces; its nonlinear deformation is computed using a plane strain code, while the applied horizontal forces are gradually increased until large enough strains develop in most elements of the dam. The results of this analysis are utilized to derive realistic …

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Measured And Calculated Dynamic Response Of Rock-Fill Dam, Lelio H. Mejia, Katherine Fung, David W. Sykora, Joseph P. Koester, Mary E. Hynes Mar 1991

Measured And Calculated Dynamic Response Of Rock-Fill Dam, Lelio H. Mejia, Katherine Fung, David W. Sykora, Joseph P. Koester, Mary E. Hynes

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The U.S. Army Corps of Engineers recently completed a seismic stability assessment of the Ririe Darn and Reservoir Project located near Idaho Falls, Idaho. Ririe Darn is an earth- and rockfill darn with a central impervious core constructed between 1966 and 1975 in a narrow canyon of Willow Creek. A geologic and seismologic study indicated that the controlling maximum credible earthquake (MCE} is a Magnitude 7.5 earthquake at a distance of 8 km from the darn. The seismic stability analysis included a dynamic response analysis of the darn using two-dimensional finite element procedures. Empirical relations derived from the observed response …

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One- And Two-Dimensional Analysis Of Earth Dams, D. J. Elton, C. F. Shie, T. Hadj-Hamou Mar 1991

One- And Two-Dimensional Analysis Of Earth Dams, D. J. Elton, C. F. Shie, T. Hadj-Hamou

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Earth dams may experience reduction in shear strength due to seismically induced pore pressures. Such reduction may be large enough to result in large deformations and eventual loss of the reservoir. While the analysis of embankment dams subject to earthquake loading is a complicated process, it is required for evaluation of seismic stability. In particular, the possibility of liquefaction in older, hydraulically-filled or otherwise poorly compacted dams during earthquakes presents a threat that must be addressed. This paper compares two methods of calculating the peak dynamic shear stress (critical to liquefaction evaluation) that occurs in an embankment during an earthquake. …

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Response Of Earth Dams In Canyons Subjected To Asynchronous Base Excitation, Panos Dakoulas, Humayun Hashmi Mar 1991

Response Of Earth Dams In Canyons Subjected To Asynchronous Base Excitation, Panos Dakoulas, Humayun Hashmi

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

A mathematical solution is presented for steady-state lateral response of earth and rock fill dams in canyons subjected to asynchronous excitation consisting of obliquely incident SH waves. The dam is idealized with a 2-dimensional shear wedge and the canyon is considered rectangular and consisting of flexible rock. A parametric study is undertaken to investigate the influence of (a) the angle of incidence, (b) the impedance ratio and (c) the canyon narrowness on the steady-state response, by considering in a simplifying way the effects of the dam-canyon interaction. The results demonstrate that the above factors may have a significant effect on …

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Seismic Stability Of Hillslopes In Greater Cincinnati Area, M. Zoghi, A. Bodocsi Mar 1991

Seismic Stability Of Hillslopes In Greater Cincinnati Area, M. Zoghi, A. Bodocsi

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Slope stability problems involving colluvia on shale bedrock are common in the Greater Cincinnati Area. The behavior of these hillslopes during earthquakes is, however, not known. This gives cause to speculation whether they are vulnerable to earthquake vibrations. In order to verify the response of these slopes to earthquake induced ground motions, representative composite clay shale samples obtained from a typical colluvial hillside in Cincinnati were tested in a cyclic direct shear apparatus which was attached to a load cell from the MTS piston actuator. The samples were initially consolidated under a selected normal pressure and then sheared until residual …

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Stability Analyses In The Ports Of Long Beach And Los Angeles, Allen M. Yourman Jr., Gerald M. Diaz Mar 1991

Stability Analyses In The Ports Of Long Beach And Los Angeles, Allen M. Yourman Jr., Gerald M. Diaz

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The combined Ports of Los Angeles and Long Beach (Ports) have experienced extensive growth over the last three decades. A main feature of the expansions is the creation of new land by placing hydraulic fill behind rock retention dikes. This paper presents an overview of the recent history and state of practice of slope stability analyses performed for projects related to the expansion of the Ports. The geologic and seismic setting and typical soil conditions are also described. This paper is based on a review of geotechnical reports prepared for projects in both Ports and selected published papers. The various …

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Attenuation Laws Considering M And R Uncertainties, Sun-Rong Huo, Yuxian Hu Mar 1991

Attenuation Laws Considering M And R Uncertainties, Sun-Rong Huo, Yuxian Hu

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Accounting for the measuring errors or uncertainties of magnitude and distance in addition to ground motion, the attenuation laws for peak horizontal ground acceleration (PGA), velocity(PGV). And displacement (PGD) are studied with a weighted consistent least-square regressional method (WCLSRM) proposed by the authors to obtain the functional relation among several random variables (R.V.). The saturation of ground motions near epicenter with respect to both magnitude and distance is also emphasized in the models. The result is that the scaling factors for distance and the linear term of magnitude in the attenuation relations regressed by the suggested method are about 16 …

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Bem-Fem Hybrid Analysis For Topographical Site Response Characteristics, Hirokazu Takemiya, Masaki Ono, Kiyotaka Suda Mar 1991

Bem-Fem Hybrid Analysis For Topographical Site Response Characteristics, Hirokazu Takemiya, Masaki Ono, Kiyotaka Suda

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

This paper concerns an amplification of seismic ground motions by a certainly shaped surface soil deposits in view of its topographical configuration. Different hybrid methods of the boundary element method (BEM) and the finite element method (FEM) are used for the two-dimensional (2- D) analysis. In the analysis, the far field impedance is first evaluated by BEM then it is incorporated into the near field FEM analysis based on the weighted residual method. The steady state responses for different types of harmonic incident waves are investigated. Some useful findings are pointed out in comparison with the one-dimensional (1-D) results.

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Dynamical Behavior Of A Slightly Alluvial Basin Due To Concentrated Turbulence, Takashi Nishigaki, Kensuke Baba Mar 1991

Dynamical Behavior Of A Slightly Alluvial Basin Due To Concentrated Turbulence, Takashi Nishigaki, Kensuke Baba

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

This paper is concerned with theoretical analyses and numerical evaluations based on the wave propagation theory to find dynamic characteristics of an alluvial basin locally situated on a half spatial bedrock due to concentrated loadings on the free surface. The method presented herein is derived from the Aki and Larner's method by releasing the assumption of the repeated irregularities, so that the wave field having localized irregularities can be evaluated. The numerical analyses show that the amplification effects are obvious on the free surface inside the alluvial sediment and the subsurface structure influences the seismic behavior observed on the surface.

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Effect Of Local Soil Stratigraphy On Microtremor Measurements, George Bouckovalas, Ioanna Krikeli Mar 1991

Effect Of Local Soil Stratigraphy On Microtremor Measurements, George Bouckovalas, Ioanna Krikeli

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

The method of microtremors has been recently applied for the microzonation of the town of alamata, in southern Greece. Results from this study are evaluated in comparison with predictions of seismic ground response obtained by 1-D wave propagation analyses. Predominant periods of microtremor are considerably lower than estimated fundamental ground periods. It is shown that a small part of the observed differences in due to soil non-linearity in connection with the small strain amplitudes induced by microtremors. The largest part appears to be due to geologic factors, namely the existence of rigid soil layers within the soft soil above the …

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Effects Of Local Soil Conditions In The 1986 Kalamata Earthquakes, George A. Athanasopoulos Mar 1991

Effects Of Local Soil Conditions In The 1986 Kalamata Earthquakes, George A. Athanasopoulos

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Seismic ground response analyses and simplified determinations of fundamental periods of soil profiles were conducted for nine sites of the Greek coastal city of Kalamata which was struck by two destructive small epicentral distance earthquakes in September of 1986. The response analyses were performed by using the computer program LUSH here as the fundamental periods were determined by applying simplified methods suggested in recent literature. The dynamic soil properties needed in all calculations were obtained by in-situ and laboratory testing. The results of all analyses showed differentiation of response from site to site in terms of both frequency content and …

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Evaluation Of Soil Amplification At Smart1 Array, Taiwan, Mansour Niazi Mar 1991

Evaluation Of Soil Amplification At Smart1 Array, Taiwan, Mansour Niazi

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

In a recent compilation and analysis of nearly 750 accelerograms, we studied six pairs of triaxial accelerograms recorded digitally at two neighboring sites underlain by rock and soil, respectively. The distance between the two sites, both located south of the SMART1 array in northeast Taiwan, is approximately 2 km. The epicentral distances are less than 80 km. For each component, we computed the ratios of peak and spectral amplitudes recorded at the soil site to that of the rock site, for three peak parameters and 23 spectral ordinates. The mean estimates of the soil amplification for the peak parameters range …

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Session 8: Opening Remarks, Ricardo Dobry Mar 1991

Session 8: Opening Remarks, Ricardo Dobry

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.

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Pseudo- Three-Dimensional Analysis Of Cyclic Deformation Of Ground Subject To Seismic Liquefaction, Ikuo Towhata, M. D. Shafiqui Islam Mar 1991

Pseudo- Three-Dimensional Analysis Of Cyclic Deformation Of Ground Subject To Seismic Liquefaction, Ikuo Towhata, M. D. Shafiqui Islam

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

A Numerical tool was developed to evaluate the effects of differential movement which occurs at the ground surface during earthquakes. A special emphasis is placed on liquefaction of subsoils. A complicated three-dimensional analysis was avoided by using a pseudo-three-dimensional method of finite element analysis which runs on an element mesh of the ground surface topography as seen from the sky. The present analysis takes into account the nonlinear stress-strain behavior of soils, the ground softening due to pore pressure development, and the irregularity in the topography. The proposed method was applied to several cases in which buried pipelines were damaged …

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Seismic Response Of Deep Soil Profiles In The New Madrid Seismic Zone, William E. Manrod Iii, James E. Beavers, M. Joe Hunt Mar 1991

Seismic Response Of Deep Soil Profiles In The New Madrid Seismic Zone, William E. Manrod Iii, James E. Beavers, M. Joe Hunt

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Geotechnical and geophysical investigations are being performed at a site which is located within 60 km of the epicenter of the 8.7 magnitude New Madrid February 7, 1812 earthquake. The exploration is being performed to determine the seismic response of the soil profile and to evaluate the liquefaction potential of the site. Permanent downhole instrumentation for seismic monitoring will be installed.

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