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Engineering

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Selected Works

1976

Articles 1 - 6 of 6

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Strain Dependence Of Electromagnetic Generation Of Ultrasonic Surface Waves In Ferrous Metals, R. Bruce Thompson May 1976

Strain Dependence Of Electromagnetic Generation Of Ultrasonic Surface Waves In Ferrous Metals, R. Bruce Thompson

R. Bruce Thompson

It is demonstrated that the efficiency of the electromagnetic generation of ultrasonic surface waves in ferrous metals is strongly influenced by superimposed elastic strains. A graph of efficiency versus applied magnetic field has many features, and the changes of these in Armco iron and 1018 Steel are reported for the strain range −3×10−3 <Δl/l <3×10−3 (‖calculated stress‖<620 MN/m2 or 90 KSI). Striking changes are observed, particularly for fields below 200 Oe. The results are interpreted in terms of the strain dependence of the magnetostrictive properties of the material. Possible applications of the effect to nondestructively measure residual stress are considered.

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Studies On Disinfection And Chemical Oxidation With Ozone And Chlorine In Water Reclamation, W. R. Ross, Johannes Van Leeuwen, W. O. K. Grabow Jan 1976

Studies On Disinfection And Chemical Oxidation With Ozone And Chlorine In Water Reclamation, W. R. Ross, Johannes Van Leeuwen, W. O. K. Grabow

Johannes van Leeuwen

Laboratory studies showed that Pseudomonas aeruginosa, Aeromonas hydrophila and Acinetobacter anitratum are more resistant to chlorine and ozone than Escherichia coli. Pseudomonas aeruginosa was the most resistant of all strains tested and was selected as test organism for pilot plant studies on the efficiencies of chlorine and ozone disinfection. The disinfectants proved equally efficient for the disinfection of chlorine demand-free water but ozone was much more efficient in the case of water with a chlorine demand. This difference was confirmed to be due to the property of chlorine to react with nitrogenous substances to form chloramines which are less efficient …

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Morphological Studies Of Semicrystalline Poly(2, 6-Dimethylphenylene Oxide), William Macknight, W. Wenig, R. Hammel, F. E. Karasz Dec 1975

Morphological Studies Of Semicrystalline Poly(2, 6-Dimethylphenylene Oxide), William Macknight, W. Wenig, R. Hammel, F. E. Karasz

William MacKnight

A sample of poly(2,6-dimethylphenylene oxide) (PPO) has been crystallized by exposure to 2-buta­none (MEK) vapor. This sample has been investigated by wide and small angle x-ray scattering (WAXS and SAXS), differential scanning calorimetry (DSC), and light-scattering techniques. The WAXS and DSC experi­ments reveal a maximum crystallinity of about 30%. The SAXS, analyzed according to the linear paracrystal model of Hosemann, indicates a high degree of order in the superlattice with an average crystal lamellar thickness of 38 A. Extensive peak broadening occurs in the W AXS curve arising from crystal lattice distortions or defects. These dis­tortions or defects most probably …

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Thermally Stimulated Discharge In Polymer Electrets: Compatibility And Impurity Effects, William Macknight, P. Alexandrovich, F. E. Karasz Dec 1975

Thermally Stimulated Discharge In Polymer Electrets: Compatibility And Impurity Effects, William Macknight, P. Alexandrovich, F. E. Karasz

William MacKnight

Polymer electrets have been prepared and studied by measuring thermally stimulated discharge currents, Two current maxima have been observed for samples of polystyrene, poly(p-chlorostyrene), and a random copolymer of styrene and p-chlorostyrene, These maxima are attributed to dipole reorientation· accompanying the glass transition and to real charge drifts. Poly(2,6 dimethyl-1,4-phenylene oxide) and blends of this polymer with the three aforementioned polymers were also studied. In these systems unresolved and nonreproducible peaks were obtained, and these difficulties have been attributed to impurities present. 

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Rheological Properties Of Partially Hydrolyzed Ethylene-Vinyl Acetate Copolymers, William Macknight, Mihailo Jacovic, Muneki Yamada, Roger S. Porter Dec 1975

Rheological Properties Of Partially Hydrolyzed Ethylene-Vinyl Acetate Copolymers, William Macknight, Mihailo Jacovic, Muneki Yamada, Roger S. Porter

William MacKnight

No abstract provided.

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Dynamic Mechanical Properties Of Polypentenamers With Pendant Ionic Groups And Their Hydrogenated Derivatives, William Macknight, K. Sanui Dec 1975

Dynamic Mechanical Properties Of Polypentenamers With Pendant Ionic Groups And Their Hydrogenated Derivatives, William Macknight, K. Sanui

William MacKnight

No abstract provided.

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