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Engineering

Selected Works

Selected Works

1993

Articles 1 - 11 of 11

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Comparison Of Suppression Across Frequencies, Linda M. Thibodeau, Marc A. Fagelson Nov 1993

Comparison Of Suppression Across Frequencies, Linda M. Thibodeau, Marc A. Fagelson

Marc A. Fagelson

Although much research has focused on the temporal, spectral, and intensity relationships between a masker and a suppressor, there has been little attention directed towards relative amounts of suppression in different frequency regions. The purpose of this experiment was to compare the magnitude of suppression at 500 and 2000 Hz in two forward‐masking experiments with seven normal‐hearing persons. In the first experiment, the threshold for a 10‐ms probe was determined as the bandwidth of a 400‐ms masker increased from 0.05 to 1.6 times the probe frequency. Suppression was determined by observing a decrease in threshold when the masker bandwidth exceeded …

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Strength Of Bentonite Water-Well Annulus Seals In Confined Aquifers, Fred Ogden Feb 1993

Strength Of Bentonite Water-Well Annulus Seals In Confined Aquifers, Fred Ogden

Fred L. Ogden

The advantages of bentonite clay for sealing applications are well known. Bentonites have extremely low permeability, do not affect formation water chemistry, and have the ability to swell and deform in response to subsurface changes. The major limitation on the applicability of bentonite for water well annulus sealing is strength. Strength tests conducted in a physical model of a water well identified the expected magnitude of shear strength for several commercially available bentonite well-sealing products. The dependence of bentonite strength in the annulus of a water well on both setting time and borehole geometry is discussed. Force balance calculations for …

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Burnham, Colton, And Pollock Reply, Nancy Burnham, Rj Colton, Hm Pollock Jan 1993

Burnham, Colton, And Pollock Reply, Nancy Burnham, Rj Colton, Hm Pollock

Nancy A. Burnham

It is not necessary to obtain permission to reuse this article or its components as it is available under the terms of the Creative Commons Attribution 3.0 License. This license permits unrestricted use, distribution, and reproduction in any medium, provided attribution to the author (s) and the published article's title, journal citation, and DOI are maintained. Please note that some figures may have been included with permission from other third parties. It is your responsibility to obtain the proper permission from the rights holder

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Intramolecular Interactions In Poly(Styrene-Co-Acrylonitrile)/Poly(Epsilon-Caprolactone) Blends.Pdf, William Macknight, V. Janarthanan, J. Kressler, F. E. Karasz Dec 1992

Intramolecular Interactions In Poly(Styrene-Co-Acrylonitrile)/Poly(Epsilon-Caprolactone) Blends.Pdf, William Macknight, V. Janarthanan, J. Kressler, F. E. Karasz

William MacKnight

No abstract provided.

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Amorphous-Crystalline Block Copolymer And Amorphous Homopolymer Blends. 1. A Preliminary Report, William Macknight, Kazuo Sakurai, David J. Lohse, Donald N. Schulz, J.A. Sissano Dec 1992

Amorphous-Crystalline Block Copolymer And Amorphous Homopolymer Blends. 1. A Preliminary Report, William Macknight, Kazuo Sakurai, David J. Lohse, Donald N. Schulz, J.A. Sissano

William MacKnight

No abstract provided.

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Dynamics Of The Junction Point In Model Network Polymers By (31)P Nuclear Magnetic Relaxation, William Macknight, Jie-Feng Shi, L. Charles Dickinson, James C. W. Chien Dec 1992

Dynamics Of The Junction Point In Model Network Polymers By (31)P Nuclear Magnetic Relaxation, William Macknight, Jie-Feng Shi, L. Charles Dickinson, James C. W. Chien

William MacKnight

Solid-state 3lP NMR spin-lattice relaxation times (2'1~) have been measured over a wide range
of temperatures for a series of network polymers with molecular weights between cross-links (M,r)an ging
from 250 to 2900. The networks were formed from poly(tetrahydr0furan) and tris(4-isocyanatophenyl)
thiophosphate. The chain length dependence of the glass transition temperature obeys the Fox-Loshaek
relation. The dominant mechanism for 3lP spin-lattice relaxation was found to be chemical shift anisotropy.
The data fitted equally well to the ColeCole or the Williams-Watts relaxation functions. The apparent and
microscopic activation energies for the motion of junction points are 44-73 and 23-30 kJjmo1, respectively, …

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Thermodynamic Aging Of Immiscible Polymer Blends, William Macknight, Ronald Koningsveld, Karel Sole Dec 1992

Thermodynamic Aging Of Immiscible Polymer Blends, William Macknight, Ronald Koningsveld, Karel Sole

William MacKnight

No abstract provided.

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Structure In Mesogenic Diol-Containing Polyesters, William Macknight, Hartmut Fischer, F. E. Karasz Dec 1992

Structure In Mesogenic Diol-Containing Polyesters, William Macknight, Hartmut Fischer, F. E. Karasz

William MacKnight

No abstract provided.

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Small-Angle X-Ray Scattering (Saxs) Studies Of Sulfonated Polystyrene Ionomers. 1. Anomalous Saxs, William Macknight, Benjamin Chu, Dan Q. Wu, Robert D. Lundberg Dec 1992

Small-Angle X-Ray Scattering (Saxs) Studies Of Sulfonated Polystyrene Ionomers. 1. Anomalous Saxs, William Macknight, Benjamin Chu, Dan Q. Wu, Robert D. Lundberg

William MacKnight

Morphological studies of sulfonated polystyrenes by using small-angle X-ray scattering (SAXS)
and anomalous SAXS (ASAXS) are presented. ASAXS was used to study a model ionomer system: zinc
salts of sulfonated polystyrene (SPS). The results showed the presence of local clustering, as well as longrange
inhomogeneities of ions. The observed morphology could be attributed only to themetal ionicstructures,
as can be proven by means of ASAXS. However, with the SAXS patterns by SPS being much stronger than
those of polystyrene or SPS in acid form, the excess SAXS patterns of the metal ions can be measured with
greater precision by SAXS …

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Dynamic Modelling Of Industrial So2 Oxidation Reactors Part Ii. Model Of A Reverse-Flow Reactor, Krzysztof J. Gosiewski Dec 1992

Dynamic Modelling Of Industrial So2 Oxidation Reactors Part Ii. Model Of A Reverse-Flow Reactor, Krzysztof J. Gosiewski

Krzysztof Gosiewski

The results are presented of a computer simulation of a reverse-flow reactor. The results are compared with experimental data quoted by other workers. The necessity to take into account gas-to-catalyst heat transfer is stressed, so that quantitatively correct predictions may be obtained using the model. A brief description is given of the way flow reversal has been incorporated in the model, and the possibility of the accumulation of errors occurring during the calculations is mentioned. It is shown that the one-dimensional heterogeneous model of the bed makes it possible to analyze the process with an accuracy sufficient for the preliminary …

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Sliding Mode Control Of The Systems With Uncertain Direction Of Control Vector, Sergey V. Drakunov Dec 1992

Sliding Mode Control Of The Systems With Uncertain Direction Of Control Vector, Sergey V. Drakunov

Sergey V. Drakunov

No abstract provided.

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