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Selected Works

1991

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Articles 1 - 9 of 9

Full-Text Articles in Engineering

Modeling Electroplating Rinse Systems Using Equation-Solving Software, Andrew C. Hillier, Clifford W. Walton Oct 1991

Modeling Electroplating Rinse Systems Using Equation-Solving Software, Andrew C. Hillier, Clifford W. Walton

Andrew C. Hillier

Microcomputers are finding application in a vast array of academic and industrial settings, but are under-utilized in the electroplating industries. An often overlooked tool for computer simulation, for example, is equationsolving software. Such programs can predict the performance of a process system from basic mathematical relations without requiring the operator to have extensive knowledge of sophisticated programming and numerical solution techniques. A model of a multi-tank counter-current rinse system is described, then simulated with this software, and the results compared to actual plating facility rinse data, showing the excellent predictive qualities of this approach.

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Detection Of Unresolved Target Tracks In Infrared Imagery, Sarah A. Rajala, Loren W. Nolte, James V. Aanstoos Oct 1991

Detection Of Unresolved Target Tracks In Infrared Imagery, Sarah A. Rajala, Loren W. Nolte, James V. Aanstoos

James Aanstoos

Two methods for detecting dim, unresolved target tracks in infrared imagery are presented. Detecting such targets in a sequence of noisy images is very challenging from the standpoint of algorithm design as well as detection performance evaluation. Since the signal-to-noise ratio per pixel is very low (a dim target) and the target is unresolved (of spatial extent less than a pixel), one must rely on integration over target tracks which span over many image frames. In addition, since there is a large amount of uncertainty as to the pattern and location of target tracks, good algorithms must consider a large …

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Optimizing Food And Pharmaceutical Process Design With Relational Databases, Elizabeth C. Scheyder Sep 1991

Optimizing Food And Pharmaceutical Process Design With Relational Databases, Elizabeth C. Scheyder

Elizabeth C Scheyder

When designing a new food or pharmaceutical facility, a relational database is an effective tool for engineers. A centralized database on personal computers inexpensively provides the structure and accessibility for a great quantity of detailed information about equipment, instrumentation, and process parameters, as well as the ability to share this information between engineers and between disciplines. Benefits of such a system include improved quality through streamlined data checking, project-wide access to the latest data, automation of calculations, and the ability to substitute clerical time for professional time in compiling reports.

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Setting Time Effects On Bentonite Water-Well Annulus Seals, Fred L. Ogden Jun 1991

Setting Time Effects On Bentonite Water-Well Annulus Seals, Fred L. Ogden

Fred L. Ogden

Shear strength tests are conducted in a model of a water well on four, commercially available, granular bentonite well sealing products. The time dependency of annulus seal shear strength and resistance to piping is examined. Dry bentonite samples are placed through water in the annular space between the casing and borehole and allowed to set for a specified time. Pressure is applied at a constant rate to one end of the clay seal until shear or piping failure occurs. Pressure and seal displacement data are recorded on a digital data acquisition system. Annulus seal strength and resistance to piping increase …

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Emp Protection Validation Testing Approaches, George H. Baker Jan 1991

Emp Protection Validation Testing Approaches, George H. Baker

George H Baker

Integrated, operational system-level testing is required for confidence in any system's EMP hardness. Validation is not possible by analysis or inspection. Test capabilities exist to validate the EMP protection of properly designed systems. High-level free field simulators are the means of choice for testing aircraft and ground mobile systems. A combination of low level continuous wave and pulsed current injection testing are preferred for testing fixed facilities and systems connected to long line networks.

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Fluorescent Molecular Probe Technique For Assessing The Interaction Between Sulfonated Polystyrene And Poly(Ethyl Acrylate-Co-4-Vinylpyridine) Ionomers In Tetrahydrofuran, William Macknight, Kirill N. Bakeev Dec 1990

Fluorescent Molecular Probe Technique For Assessing The Interaction Between Sulfonated Polystyrene And Poly(Ethyl Acrylate-Co-4-Vinylpyridine) Ionomers In Tetrahydrofuran, William Macknight, Kirill N. Bakeev

William MacKnight

The interaction between sulfonated polystyrene (SPS) and poly(ethy1 acrylate-eo-4-vinylpyridine)
(EtAc4VP) ionomers was investigated over a wide range of concentrations in the nonpolar solvent,
tetrahydrofuran (THF), using a fluorescent molecular probe technique. The acid-base interaction between
the sulfonate groups of SPS and the pyridine groups of EtAcVP and the miscibility of these ionomers are
evident for pyridine contents of 7.8 and 4.5 mol 5% in EtAc4VP and are not detectable for EtAc4VP with
1.7 mol % pyridine groups. Concentration-dependent excimer fluorescence from SPS and EtAc4VP mixtures
indicates the occurrence of polar interactions as a result of proton transfer from the styrenesulfonic …

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Mechanism Of The Dicyandiamide/Epoxide Reaction, William Macknight, Michael D. Gilbert, Nathan S. Schneider Dec 1990

Mechanism Of The Dicyandiamide/Epoxide Reaction, William Macknight, Michael D. Gilbert, Nathan S. Schneider

William MacKnight

A mechanism is proposed for the dicyandiamide (dicy) cure of epoxy resins based on the
analysis of products formed by the reaction of a monofunctional epoxide with dicy and with cyanamide.
Products were isolated from the uncatalyzed reaction mixtures using preparatory liquid chromatography and
were characterized by FTIR, NMR, mass spectrometry, and elemental analysis. Both linear dicy/epoxide
adducts and cyclical species were identified and the mechanism of the cyclization reaction was delineated.
A mechanism for carbonyl generation during the later stages of cure was also found.

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Thermal, Dielectric, And Mechanical Relaxation In Poly(Benzimidazole)/Poly(Etherimide) Blends, William Macknight, Kuiming Liang, Gyorgy Banhegyi, F. E. Karasz Dec 1990

Thermal, Dielectric, And Mechanical Relaxation In Poly(Benzimidazole)/Poly(Etherimide) Blends, William Macknight, Kuiming Liang, Gyorgy Banhegyi, F. E. Karasz

William MacKnight

Thermal, dielectric, and mechanical relaxation measurements on miscible blends of poly-
benzimidazole(PBI)and a polyetherimide (PEI, Ultem 1000)prepared by solution casting
from dimethylacetamide (DMAc) reveal a number of structurally related features. Annealing
below the glass transition temperature induces an enthalpy relaxation process typical of
single-phase glasses of nonequilibrium structure. Dielectric relaxation experiments on
samples annealed at ambient conditions reveal two relaxation processes below 400°C.At
lower temperatures (50-2OO0C), the desorption of water is observed. Above 200°C in the
first run, a composition-dependent relaxation is seen at the highest frequencies ( 100 kHz)
while a relaxation approximately independent of composition appears in the …

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A Method Of Validating Mw Mvar Values, Venkateswar P. Oruganti Fiete Fie Pmp Dec 1990

A Method Of Validating Mw Mvar Values, Venkateswar P. Oruganti Fiete Fie Pmp

Venkateswar P Oruganti FIETE FIE PMP

A way of quickly validating MW MVAR values. This method helps in reducing number of combinations while trying to ascertain the right connections at the transducers in SCADA systems.

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