Engineering Commons^™

Analysis Of Local Plate Buckling Experimental Data, J. Roorda, K. R. Venkataramaiah

CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)

No abstract provided.

Shear Resistance Of Steel-Stud Wall Panels, Joseph D. Girard, Thomas S. Tarpy Jr.

CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures (1971 - 2018)

No abstract provided.

Approximate Solutions For Distillation Rating And Operating Problems Using The Smoker Equations, Raymond C. Waggoner, Terry L. Tolliver

Chemical and Biochemical Engineering Faculty Research & Creative Works

Algorithms for rapid solution of implicit variables in the Smoker design equations are presented. The accuracy of these solutions in the context of distillation rating and operating problems Is evaluated for distillation systems where more rigorous physical property assumptions are known to apply. Alternative methods of initially fitting the Smoker equations to rigorous tray-by-tray material and energy balance calculations as well as methods extending the procedure to handle multicomponent systems are discussed. These methods are well suited for many optimization, reliability, and control studies as well as for the fast real-time calculations such as interactive computations or on-line control. © …

An Exploratory Study On The Behavior Of Cold-Formed Steel Wall Studs, Yaochun Zhang, Teoman Peköz

CCFSS Library (1939 - present)

No abstract provided.

An Exploratory Study On The Behavior Of Cold-Formed Steel Wall Studs, Yaochun Zhang, Teoman Peköz

CCFSS Library (1939 - present)

GENERAL Cold-formed steel wall studs are widely used in the U. S. and Canada. The 1980 A.I.S.I Specification (Ref. 1) contains provisions for the design of such wall studs based primarily on the research conducted at Cornell University (Refs. 2 and 3). This research involved theoretical and experimental studies on wall studs subjected axial loads only. The Specification provisions on the case of combined axial and lateral loading were derived intuitively and were made intentionally conservative. The excessive conservatism in the provisions for the combined loading case prevents using wall studs as economically as possible. The primary objective of the …

Performance Evaluation Of Brick Veneer With Steel Stud Backup, Joseph O. Arumala, Russell H. Brown

CCFSS Library (1939 - present)

No abstract provided.

Factors Influencing The Production Rate And Quality Of Lead Sinter, John R. Knoepke, Hung Yang Tsai, Arthur E. Morris

Materials Science and Engineering Faculty Research & Creative Works

The sintering characteristics of a typical Missouri lead concentrate were determined for two types of raw sinter mix: conventionally prepared and pelletized. The important sintering characteristics are sulfur elimination, sinter strength, production rate of sinter, permeability of the sinter bed, and bed temperature. These characteristics were analyzed statistically, and are described by an empirical model, in which proportion of returns, moisture content, air flow, bed height, size distribution of returns, and ignition time are the independent variables. The characteristics of a conventionally prepared sinter mix are most strongly affected by the moisture content of the raw mix. The characteristics of …

Seismic Design For Buildings, Department Of The Army, The Navy, And The Air Force

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

This updated manual with revised seismic design provisions governs the design and construction of Army, Navy, and Air Force facilities and supersedes the April 1973 issue. Basic criteria are stated herein with augmentations and clarifications of the criteria. Also, commentary and design examples are included to provide comprehensive applications and guidelines for the seismic-resistant design of facilities. The organization of the manual has been revised to present the topics in a more orderly manner. The dynamic analysis approach for seismic design is not covered but its use is not precluded in this manual.

The basic criteria cited are the "Recommended …

Structural Stability Research Council: Proceedings 1982, Structural Stability Research Council

CCFSS Library (1939 - present)

One of the purposes of the the of Council is to maintain a forum where the the of Council is to maintain a forum where the structural stability aspects of metal andcomposite metal and concrete structures and and their components can be presented for evaluation, and pertinent structural research problems proposed for investigation. The Annual Technical Session provides an opportunity to carry out this function.

Geotechnical Evaluation Of The Support Of Coal Pillars In Underground Coal Mines., John D. Rockaway, Richard W. Stephenson

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The Study Described Was Accomplished through an Investigation of Both the Intact and Insitu Geotechnical Properties of the Sub coal Strata and through the Installation of Floor Movement Monitoring Instrumentation. the Method of Bearing Capacity Analysis Developed by A. S. Vesic Was Used to Define Pillar Stability. This Method Includes Provisions for Taking into Consideration a Two-Layer System Such as Assumed for Mine Conditions Where a Weak Underclay overlies Firmer Strata.

Optical Filtering Element, Gary Edward Mueller, Timothy D. Ziebarth

Nuclear Engineering and Radiation Science Faculty Research & Creative Works

Optical filtering elements having two opposed surfaces and including at least one thin layer of stable non-reflective fluorescent material provide transparent articles which, when exposed to incident electromagnetic radiation at one surface of the fluorescent layer, absorb certain wavelengths within the fluorescent layer and emit other wavelengths at the opposed surface of the fluorescent layer. In preferred embodiments, when radiation (light) in the visible range (about 400 nm to about 700 nm) is incident on the element from one side, certain wavelengths of radiation which transverse the element are absorbed in the fluorescent layer and other radiation of greater, but …

Effects Of Varying Oxygen Partial Pressure On Molten Silicon-Ceramic Substrate Interactions, And Oxygen Partial Pressure Measurements Of Silicon Sheet Production Facilities, P. D. Ownby, Harold V. Romero

Materials Science and Engineering Faculty Research & Creative Works

No abstract provided.

Deposition Of Cdte By Spray Pyrolysis, Jack L. Boone, Thomas P. Van Doren, Alok K. Berry

Electrical and Computer Engineering Faculty Research & Creative Works

We report the spray pyrolysis of thin films of CdTe which show promise as a base material for solar cell applications. The films predominately show a zinc blende structure and appear to be intrinsic. Microprobe analysis indicates an excess of cadmium but this is not detectable by X-ray diffraction or from electrical conduction measurements. Measurements indicate a nominal direct bandgap of 1.47 eV and an absorption coefficient of the order of 104 cm−1. The room temperature electrical resistivity is of the order of 107 Ω cm.

Measurement Of The Wear Properties Of Metallic Solids With A Falex Lubricant Testing Machine, Edward Boyd Hale, Chun-Ping John Meng, Ronald A. Kohser

Physics Faculty Research & Creative Works

A modified Falex Lubricant Testing Machine has been used to determine wear properties of metallic solids. In particular, wear mass loss, wear volume loss, wear rates, and other parameters have been determined for a basic steel, as heat treated and after ion implantation. Wear rate improvements of more than an order of magnitude were found in a nickel-chrome steel (SAE 3135) implanted with 2.5x10¹⁷ N⁺₂/cm². Wear tests were conducted with a cylinder-in-groove geometry in a mild lubricating oil with loads greater than 540 N, which corresponded to pressures which exceeded 10⁸N/m^{2 …}

Vapor Pressures Of Some C4 Hydrocarbons And Their Mixtures, Judith L. Flebbe, David A. Barclay, David B. Manley

Chemical and Biochemical Engineering Faculty Research & Creative Works

New experimental vapor pressures for the six binary systems containing 1,3-butadlene, n-butane, trans -2-butene, and c/s-2-butene at temperatures from 278 to 358 K are reported. Relative volatilities were calculated by using the Isothermal general coexistence equation. © 1982, American Chemical Society. All rights reserved.

The Anodic Dissolution Of Zns Electrodes In Sulfuric Acid Solutions, Ram A. Narasagoudar, James W. Johnson, Thomas J. O'Keefe

Chemical and Biochemical Engineering Faculty Research & Creative Works

The anodic dissolution of reagent grade ZnS and ZnS concentrate has been studied. The majority of the research was conducted in H₂SO₄ although a limited number of tests were made in HCl and KOH. Polarization studies showed that both Zn²⁺ and S were products in the acidic solutions. ZnS passivated in KOH solutions. The electrodes were fabricated by hand pressing mixtures of ZnS + pitch (5-15%) and sintering at 800°C in a N2 atmosphere. The open circuit potentials were considered to be mixed potentials resulting from the anodic dissolution of ZnS and cathodic reduction of S …

Ethanol Densities Between −50 And 20 °C, Mark R. Schroeder, Bruce E. Poling, David B. Manley

Chemical and Biochemical Engineering Faculty Research & Creative Works

The density of ethanol was measured between −50 and 20 °C to ±0.01%. The measurements were made by using a procedure similar to ASTM D1217-54, "Standard Method of Test of Density and Specific Gravity of Liquids by Bingham Pycnometer". The results were correlated by the equation in D = −0.215231 − (1.05037 x 10−3)T − (7.837 x 10−7)T2 − (7.47 x 10−3)T3 (D in g/cm3, T in ° C). © 1982, American Chemical Society. All rights reserved.

Relative Volatilities Of The Ethane-Ethylene System From Total Pressure Measurements, David A. Barclay, Judith L. Fiebbe, David B. Manley

Chemical and Biochemical Engineering Faculty Research & Creative Works

A new apparatus has been developed for making vapor pressure measurements on high-pressure systems. Using this equipment, we have made a large number of new total pressure measurements on the ethane-ethylene binary from 198.15 to 278.15 K. By Integration of the general coexistence equation, relative volatilities have been calculated for ethane-ethylene over the entire temperature range. © 1982, American Chemical Society. All rights reserved.

Inversion To Obtain Aerosol Size Distributions From Measurements With A Differential Mobility Analyzer, Darryl J. Alofs, P. Balakumar

Mechanical and Aerospace Engineering Faculty Research & Creative Works

To Measure Size Distributions of Sub micrometer Aerosols with an Electrical Differential Mobility Analyzer (DMA) Requires an Inversion Procedure. the Knutson (1976) and the Hoppel (1978) Inversion Procedures Were Numerically Investigated for the Case of Log-Normal Aerosol Size Distributions. It Was Found that the Hoppel Procedure Converges to the Same Result as that Given by the Knutson Procedure. the Computational Range for Geometric Mean Diameter (Χ_g) Was 0.025-0.25 Μm, and for Geometric Standard Deviation (Σ_g) Was 1.1-2.4. the Inversion Error Was Found to Be Greater Than 10% in Certain "Forbidden Zones" of Χ_g and Σ …

Phaseautomodulation In Magnesium, Alexander Aning, Tetsuro Suzuki, Manfred Wuttig

Physics Faculty Research & Creative Works

No abstract provided.

Generalized Running Discrete Transforms, John A. Stuller

Electrical and Computer Engineering Faculty Research & Creative Works

This Paper Introduces a Generalized Running Discrete Transform with Respect to Arbitrary Transform Basea, and Relates the Generalized Transform to the Running Discrete Fourier Z and Short-Time Discrete Fourier Transforms. Concepts Associated with the Running and Short-Time Discrete Fourier Transforms Such as 1) Filter Bank Implementation, 2) Synthesis of the Original Sequence by Summation of the Filter Bank Outputs, 3) Frequency Sampling, and 4) Recursive Implementations Are All Extended to the Generalized Transform Case. a Formula is Obtained for Computing the Transform Coefficients of a Segment of Data at Time N Recursively from the Transform Coefficients of the Segment of …

An Optimal Control Law By Eigenvalue Assignment For Improved Dynamic Stability In Power Systems, A. B.R. Kumar, Earl F. Richards

Electrical and Computer Engineering Faculty Research & Creative Works

No abstract provided.

An Analytical Method For Quantifying The Electrical Space Heating Component Of A Cold Load Pick Up, Walter W. Lang, Max Darwin Anderson, David R. Fannin

Electrical and Computer Engineering Faculty Research & Creative Works

After an extended cold weather outage on a distribution circuit supplying a high saturation of electrical space heating, large transient overcurrent's persist for several hours because of the undiversified heating load. In this paper, the electrical space heating component of enduring demand is characterized by a smooth curve. Expressions are derived for the parameters of the curve in terms of the outage conditions and a statistical description of the residences. A method is suggested for using this characterization to determine the effects of a cold load pick up on the distribution circuit components. Copyright © 1982 by The Institute of …

A Control Program And Operating System For A Three Joint Robot Arm On An Apple Microcomputer, Eric Henry Stelzer

Masters Theses

"A Robotics Operating and Control System for a three-joint robot arm model is presented. The general operation of the system in interfacing the robot to the operator is discussed. Kinematic equations for the robot are derived and commands available to the operator are covered in some detail. The operation of the Control System in moving the robot is explained. Finally, suggestions are made for further development of the system"--Abstract, page ii.

Aerodynamics Of Closely Coupled Wings For Varying Chords And Airfoil Planforms, Gary D. Vincent

Masters Theses

"Aerodynamic characteristics of a dual wing aircraft were analyzed with variations in airfoil sections and chord ratios over existing equal chard ratio dual wing and monoplane aircraft designs. Two- and three-dimensional aerodynamic studies were conducted to find the wing geometry which would create the minimum cruise drag. The two-dimensional aerodynamic data was obtained from a multi-element inviscid vortex panel program coupled to a momentum integral boundary layer program to account for the aerodynamic coupling between the wings. With this data, a three-dimensional vortex lattice program calculated the three-dimensional aerodynamic data. compared to an equal chard ratio dual wing aircraft, lower …

The Influence Of Manganese Oxide On Sintering Of A Commercial Natural Magnesite., Alamar Kasan Duarte

Masters Theses

"Sintering studies on a commercial natural magnesite have been done to investigate the influence of MnO doping (MnO concentration from 0.16 to 2.50 wt.%) on the densification process over the temperature range 1520 to 1760°C , over periods of time from 3,600 to 57,600s in both oxidizing and reducing atmospheres (Air and P_O2 = 10^-7 KPa. In an air atmosphere the additions of MnO enhances the densification process. This fact may be associated with an increase in lattice diffusion of Mg ions due to an increase in cation vacancies in the MgO lattice from the presence of …

A Single Cylinder Engine Study Of Lean Supercharged Operation For Spark Ignition Engines, Kenneth Robert Schmid

Masters Theses

"A comprehensive single cylinder engine test program to evaluate Lean Supercharged Operation (LSO) for spark ignition engines was conducted. The evaluation involved an experimental program studying the power, emissions, and efficiency of a single cylinder engine. The relationships between engine power, efficiency, and emissions and the engine operating variables such as absolute intake manifold pressure, Exhaust Gas Recirculation rates, and spark timing were studied"--Abstract, page ii.

Development Of A Friction Element For Metal Forming Analysis, W. D. Webster, Robert L. Davis

Mechanical and Aerospace Engineering Faculty Research & Creative Works

A three-dimensional finite element friction element has been developed. The friction element has been used in the analysis of round-to-square forward extrusion.Comparison with some limited experimental data is presented. © 1982 by ASME.

Sequential Probability Ratio Tests For The Shape Parameter Of A Nonhomogeneous Poisson Process, Lee J. Bain, Max Engelhardt

Mathematics and Statistics Faculty Research & Creative Works

Sequential probability ratio tests for the shape parameter of one or more nonhomogeneous Poisson processes, with power intensity functions, are provided. The tests can be performed when the scale parameter is an unknown nuisance parameter; the effective loss of not knowing the scale parameter is one observation per process. The resulting tests can be expressed in terms of the maximum likelihood estimators of the shape parameters for the usual fixed sample procedure. A further advantage of the present approach is that the scale parameters for different processes, in the multiple sample procedures, need not be equal. Approximations for the operating …

An Optimal Control Law By Eigenvalue Assignment For Improved Dynamic Stability In Power Systems, A. B.R. Kumar, Earl F. Richards

Electrical and Computer Engineering Faculty Research & Creative Works

Whenever control laws are computed on the basis of linear optimal control theory and implemented on non-linear systems, such as power systems, the performance is not as good as expected because of saturation type non-linearities in the system components. The only way to ensure that a control law is adequate, short of actually testing the real system, is to observe the simulated behavior of the system. Departure between a calculated linear control law and the actual response can be minimized by (a) computing a feedback control law with gains of small magnitudes to achieve a pre-assigned set of eigenvalues for …