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Articles 185551 - 185580 of 196864

Full-Text Articles in Engineering

Geomechanics Of Reservoir Induced Seismicity, Thomas Vladut Apr 1981

Geomechanics Of Reservoir Induced Seismicity, Thomas Vladut

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

Although induced seismicity associated with the impounding of reservoirs is a relatively rare phenomenon, it should nevertheless be taken into account, particularly in the design of dams located in aseismic zones. The operation of dams is not significantly affected by induced activities: the main concern arises in situations where unexpected events might affect the behavior of the construction due to soil liquefaction or might affect slope stability. This paper reviews the principal elements which are considered to affect the occurrence of the phenomenon: the weight of the water storage, and the development of pore pressure under the storage. Both elements …

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Planning Instrumentation Monitoring In Dams, S. N. Guru Rau, R. K. Varma Apr 1981

Planning Instrumentation Monitoring In Dams, S. N. Guru Rau, R. K. Varma

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

This paper outlines the seismic instrumentation being adopted for river valley projects in India, More than 60% of Indian sub-continent lies in an active seismic belt. Of this the middle and lower Himalayas constitute a major area wherein lies a huge untapped hydro-power potential, Being primarily constituted of younger rock formations, frequented by faults, thursts and shear zones and lying in a high seismic risk zone, observations through instruments play a significant role in perspective planning of projects in this area. Setting up of seismological observatories in advance of construction of dam projects, forms a part of investigative planning to …

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Dynamic Consolidation Of Liquefiable Sands, R. K. M. Bhandari Apr 1981

Dynamic Consolidation Of Liquefiable Sands, R. K. M. Bhandari

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

The Subsoils underneath a tank were improved by dynamic consolidation to density levels required to resist earthquake induced liquefaction. The paper presents seismic analysis of the refinery region, simple liquefaction potential analysis using modified depth reduction factors and performance of the tank resting on the densified ground. The degree of uniformity of compaction achieved by the dynamic consolidation has been discussed.

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Local Soil Effects And Liquefaction In The 1978 Thessaloniki Earthquakes, George Gazetas, John Botsis Apr 1981

Local Soil Effects And Liquefaction In The 1978 Thessaloniki Earthquakes, George Gazetas, John Botsis

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

The geotechnical aspects of three earthquakes that struck the city of Thessaloniki, Greece, on May 25, June 20 and July 4, 1978 are presented. General background information on the observed damage, seismic history and geology of the area is followed by detailed description of soil profiles, structural characteristics and accelerograms of ground motions recorded at three sites. Acceleration spectra are then examined and compared in order to assess the degree to which local and regional geology and soil-structure interaction affected the recorded motion. Finally, the possibility of liquefaction having taken place in a 6 m-thick saturated loose layer of silty …

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Engineering Seismology Aspects Of The M-6.5, Southern Italy Earthquake Of Nov. 23, 1980: A Preliminary Review, E. Faccioli Apr 1981

Engineering Seismology Aspects Of The M-6.5, Southern Italy Earthquake Of Nov. 23, 1980: A Preliminary Review, E. Faccioli

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

The paper provides an overview of salient engineering seismology features of the earthquake, which was one of the major seismic catastrophes occurring in Italy in this century. After a short description of the characteristics of the earthquake source and of the historical seismicity of the region, preliminary strong-motion and intensity data are presented. Aspects of geotechnical engineering interest include some large landslides in inhabited areas, and notable cases of correlation between severity of damage and local soil conditions and topography.

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Attenuation Of Ground Vibration Induced By Dynamical Machinery, S. J. Yang Apr 1981

Attenuation Of Ground Vibration Induced By Dynamical Machinery, S. J. Yang

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

Attenuation of ground vibration induced by dynamic machinery is investigated with fundamental theory established for both Rayleigh and body waves. Therefore, for determining such attenuation is established, in which the effects of both of them and a coefficient of attenuation of soil that makes the practical calculation easier are involved. A lot of data in relation to the surface vibration measured at some production shops and construction sites has proved that the developed formula more satisfactory than Bornitz's.

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Considerations About Some Aspects Of The 23rd November 1980 Earthquake, Filippo Ciuffi, Giuseppe Samela Apr 1981

Considerations About Some Aspects Of The 23rd November 1980 Earthquake, Filippo Ciuffi, Giuseppe Samela

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

The macroscopic effects of the earthquake of the 23rd of November 1980 in southern Italy are well-known. The purpose of this short paper is to present after about five months, some more exact testimonies with some considerations about numerous questions connected to the geotechnical and geological problems in seismic areas. We have to be precise that we, in this paper, contemplate the MURO LUCANO and CASTELGRANDE areas (in Basilicata) (fig. 1)

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Session 8: Discussions, Multiple Authors Apr 1981

Session 8: Discussions, Multiple Authors

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

No abstract provided.

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Discussion On Moderator's Report, Peter M. Byrne Apr 1981

Discussion On Moderator's Report, Peter M. Byrne

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

No abstract provided.

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Discussion On "Improvement Of Characteristics Of A Liquefiable Soil Deposit By Pile Driving Operations", By M. Iyengar, Miguel P. Romo Apr 1981

Discussion On "Improvement Of Characteristics Of A Liquefiable Soil Deposit By Pile Driving Operations", By M. Iyengar, Miguel P. Romo

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

No abstract provided.

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Discussion On "Dynamic Consolidation Of Liqufiable Sands", By R.K.M. Bhandari, Miguel P. Romo Apr 1981

Discussion On "Dynamic Consolidation Of Liqufiable Sands", By R.K.M. Bhandari, Miguel P. Romo

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

No abstract provided.

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Author's Replies, Multiple Authors Apr 1981

Author's Replies, Multiple Authors

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

No abstract provided.

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On Surface Waves In A Gibson Half-Space, I. Vardoulakis, V. Dougalis Apr 1981

On Surface Waves In A Gibson Half-Space, I. Vardoulakis, V. Dougalis

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

Harmonic Rayleigh-type and transverse surface waves in a half-space of incompressible material with constant density and with shear modulus linearly increasing with depth (Gibson half-space) are discussed. Under certain hypotheses a discrete spectrum yielding polynomial Eigen functions is obtained, a fact which makes the eigenvalue problem more tractable. The dispersion laws are presented and evaluated numerically.

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Discussions, Dinesh C. Gupta, G. L. Hempen Apr 1981

Discussions, Dinesh C. Gupta, G. L. Hempen

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

No abstract provided.

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Author's Replies, Multiple Authors Apr 1981

Author's Replies, Multiple Authors

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

No abstract provided.

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Computerized Twist Drill Selection For Cast Iron And Steel, Clinton K. Orth Apr 1981

Computerized Twist Drill Selection For Cast Iron And Steel, Clinton K. Orth

Graduate Research Papers

The science of hole making can hardly be considered new to modern day industry. Evidence of drilling dates back as early as 4000 B.C. However, computers are considered relatively new to industry and their use is growing rapidly. One of the major concerns of industry is to identify a consistent method of selecting the proper drill when given a set of variables. The problem is to identify the sets of variables and select a drill that will give consistent results.

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Web Crippling And Combined Web Crippling And Bending Of Steel Decks, Wei-Wen Yu Apr 1981

Web Crippling And Combined Web Crippling And Bending Of Steel Decks, Wei-Wen Yu

CCFSS Library (1939 - present)

INTRODUCTION A. General During the period of October 1968 through September 1980, the 1968 Edition of the AISI Specification was used for the design of steel deck webs that could withstand web crippling and combined web crippling and bending. (1) The design formulas used to prevent web crippling were developed primarily on the basis of tests conducted in the 1940's and 1950's at Cornell University. (2-4) Recently, new types of cold-formed steel sections have been developed and used in building construction. The use of unusual geometric configurations has complicated the design of such members. In order to develop new design …

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Analysis Of A Solar Collector In An Absorption Cycle Including A Pump Operated By Thermoelectric Cells, Stuart Jee-Fong Chen Apr 1981

Analysis Of A Solar Collector In An Absorption Cycle Including A Pump Operated By Thermoelectric Cells, Stuart Jee-Fong Chen

Retrospective Theses and Dissertations

A mathematical computer model has been developed for the prediction of the thermal performance of a flat-plate solar collector used as the generator for an absorption cycle cooling system. The system employs thermoelectric cells to power its pump. The exponential relationship between the auxiliary energy and the collector area is used to optimize the system. It is predicted that the system will become feasible when the fuel price is raised to four times the current value.

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Ground Access To The Orlando International Airport: Design And Evaluation Of Various Mass Transportation Alternatives, George S. Fan Apr 1981

Ground Access To The Orlando International Airport: Design And Evaluation Of Various Mass Transportation Alternatives, George S. Fan

Retrospective Theses and Dissertations

This research presents designs and evaluations of various mass transportation alternatives for reducing the problem of the ground access congestion in the Orlando International Airport. The alternatives considered in this research are conventional bus service, minibus service, express bus service, light rail transit service, rail rapid transit service, and monorail service. Details of the origin-destination studies for the present traffic are given. A discussion of the various mass transportation alternatives is provided, with provisions for future systems expansion. Three economic evaluation methods were used in this research for evaluation of various alternatives. According to the results of the economic analysis, …

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Project Network Scheduling With Limited Resources Using Heuristic Solution Techniques, Enrique J. Daboin Rojas Apr 1981

Project Network Scheduling With Limited Resources Using Heuristic Solution Techniques, Enrique J. Daboin Rojas

Retrospective Theses and Dissertations

Traditional critical path methods imply the assumption of unlimited availability of resources. Mathematical models and heuristic techniques are two alternatives that consider resource limitation to sequence the activities of a project. This research explores the consideration of project scheduling under resource constraints for the specific case of single resource, single project scheduling. A computer model called GENRES-II search model is developed using a modification of Brooks' algorithm to develop project schedules. The criteria used are various weighted combinations of ACTIM, ACTRES and ACTFOL. An improvement of GENRES-II solutions is obtained when the best set of GEN-II values is input to …

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Testing The Radio Shack Random Number Generator To Produce Uniform And Non-Uniform Random Numbers, Enrique Menendez Apr 1981

Testing The Radio Shack Random Number Generator To Produce Uniform And Non-Uniform Random Numbers, Enrique Menendez

Retrospective Theses and Dissertations

Random numbers are a basic part in a Simulation Model, and they are also used in random sampling. These techniques are employed by quality engineers in the successful execution of their jobs. The every-day use of random numbers, however, often leads to a sense of complacency in he mind of engineers toward the exacting requirements that should be satisfied by the random number process to generate a genuine random number. Microcomputers have become a common and powerful tool that helps managers and engineers in their simulation experiments by providing sequences of random numbers. This research presents a sequence of eight …

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Economics Of Residential Heat Recovery Units, Muhammad N. Redhwi Apr 1981

Economics Of Residential Heat Recovery Units, Muhammad N. Redhwi

Retrospective Theses and Dissertations

Determining residential airconditioning waste heat recovery system costs and savings is achieved using a computer program. A worksheet is designed to accept consumer data as an input to the program. The program features load and waste heat recovery calculations on a monthly basis. Economic criteria, including rate of return, present worth, and payback period are computed. Sensitivity of these criteria to fuel escalation and consumer discount rate is demonstrated. the program provides the user with both thermal analysis and economic analysis summary reports.

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An Experimental Comparison Of Cross Correlator Performances Based Upon Signal-To-Noise Ratios, Sunder G. Gopani Apr 1981

An Experimental Comparison Of Cross Correlator Performances Based Upon Signal-To-Noise Ratios, Sunder G. Gopani

Retrospective Theses and Dissertations

Three commonly employed types of cross correlators were designed using standardized components which closely simulate idealized elements in an effort to experimentally verify the theoretical analysis. These cross correlators are (1) the standard analog cross correlator which consists of bandpass filters, a multiplier and a postmultiplier lowpass filter, (2) the polarity coincidence correlator (PCC) which utilizes a hard clipper in each input channel, and (3) a modified type of PCC which features a hard clipper in only one of the input channels. Two different types of filters viz. (1) the seventh-order Butterworth lowpass filter, and (2) the five-pole Chebyshev lowpass …

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Digital Acoustic Tracking Analysis Program, George H. Ford Apr 1981

Digital Acoustic Tracking Analysis Program, George H. Ford

Retrospective Theses and Dissertations

The purpose of this report is to investigate the processing of tracking data for acoustic targets. The programs developed for two- and three- dimensional space calculate the target's position via "hyperbolic-fix" navigation (geometric) considerations using the Newton-Raphson algorithm. The computer programs and the tracking solution approach contained herein is based on knowledge of only the sensors' locations and the relative time-difference at which a target's referenced, singular, acoustic pressure wavefronts are received at the sensors. Omnidirectional sensors are found to be sufficient for the two-dimensional space tracking problem. However, it is found that the three-space problem required usage of directional …

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Application Of Generalized Geometric Programming In Preliminary Plant Design, Dennis R. Hoerner, Orrin K. Crosser Apr 1981

Application Of Generalized Geometric Programming In Preliminary Plant Design, Dennis R. Hoerner, Orrin K. Crosser

Chemical and Biochemical Engineering Faculty Research & Creative Works

This study utilizes a primal based generalized geometric programming algorithm for the optimal design of a model absorber-stripper process. The GGP algorithm reduces the generalized geometric program to a convex, linear program by two sequential condensation procedures and a logarithmic transformation. Although inactive Inequality constraints and arbitrary variable bounds were easily accommodated by the algorithm, considerable effort was required to activate the inequality constraints which required an equality condition. The GGP algorithm converged to a local minimum from arbitrary starting points for approximately 60% of the trials. © 1981, American Chemical Society. All rights reserved.

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Survey Of Lane Delineation Methods, Kenneth R. Agent Apr 1981

Survey Of Lane Delineation Methods, Kenneth R. Agent

Kentucky Transportation Center Research Report

The objective of this study was to summarize the nationwide experience pertaining to various lane delineation methods. The usage, cost, and problems associated with each alternative could then be analyzed for the purpose of determining an optimum marking program. A survey of the methods of lane delineation used across the United States was done by means of a questionnaire sent to each state. Responses were received from 46 states. Most of the information dealt with the following lane delineation methods: raised pavement markers, pavement tape, thermoplastic markings, and paint and beads.

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Sprinkle-Treated Asphaltic Concrete Surface Course, Donald C. Newberry Jr. Apr 1981

Sprinkle-Treated Asphaltic Concrete Surface Course, Donald C. Newberry Jr.

Kentucky Transportation Center Research Report

This report gives details of construction and some skid resistance data from experimental sprinkle-treatment placed in Nelson County, Kentucky, north of Bardstown, US 31-E. The various types of aggregate, application rates, and precoating processes are reported.

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Retrieval Guide: Kentucky Soils Data System, William J. Pfalzer, Louise B. Hensley Apr 1981

Retrieval Guide: Kentucky Soils Data System, William J. Pfalzer, Louise B. Hensley

Kentucky Transportation Center Research Report

The Kentucky Soils Data System is an extensive data file of the physical properties and characteristics of soils as determined by field and laboratory testing. Site locations are available for most samples. Since Kentucky has been mapped geologically (scale 1:24,000), the bedrock at each of these sample locations can be determined, providing better opportunities for studying soil-bedrock (parent material) relationships. A complimentary report covers data input. This report is divided into two sections: data availability and data retrieval. The first section is designed to show the quantity and types of data available and how the data are distributed geographically. The …

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Survey Of Effectiveness Of Transportation Services, Jerry G. Pigman, Kenneth R. Agent, Joseph D. Crabtree Apr 1981

Survey Of Effectiveness Of Transportation Services, Jerry G. Pigman, Kenneth R. Agent, Joseph D. Crabtree

Kentucky Transportation Center Research Report

With increased emphasis on public accountability and program evaluation, the need for effectiveness measures to indicate the extent to which an agency's goals and objectives are being met is increasingly apparent. A research study was undertaken to establish and implement a procedure for monitoring the effectiveness of transportation services in Kentucky. Quantitative data for many of the effectiveness measures were obtainable only through responses from the public. Surveys of licensed drivers and bus riders were selected as data sources. This report addresses the procedures and results of the two surveys. Responses were received from 35.5 percent of the 10,000 licensed …

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Multiple Scattering Of Protons And Deuterons By Thick Foils, D. R. Dixon, G. L. Jensen, S. M. Morrill, C. J. Connors, R. L. Walter, C. R. Gould, P. M. Thambiduria Apr 1981

Multiple Scattering Of Protons And Deuterons By Thick Foils, D. R. Dixon, G. L. Jensen, S. M. Morrill, C. J. Connors, R. L. Walter, C. R. Gould, P. M. Thambiduria

Faculty Publications

Protons and deuterons from the Triangle Universities Nuclear Laboratory (TUNL) tandem Van de Graaff of energies 3.0, 4.0, and 5.0 MeV were scattered from foils of Al, Ni, Mo, and Ta having thicknesses of 6.14 to 47 mg/cm2. Multiple scattering angular distributions were measured using a position-sensitive detector to collect data at nine different angles simultaneously. Gaussian curves were fitted to the central points of the distributions and the Θ1/e angles thus derived are presented graphically. The data points are compared with calculations using a common method of determining multiple scattering angles. An empirical correction for extending this method into …

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