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1979

Selected Works

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Articles 1 - 16 of 16

Full-Text Articles in Engineering

Centers Of Polymer Research; Polymer Science And Technology In The Ddr, Otto Vogl Dec 1979

Centers Of Polymer Research; Polymer Science And Technology In The Ddr, Otto Vogl

Otto Vogl

No abstract provided.

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Proliferation Resistant Reprocessing Methods, Guna S. Selvaduray, L. Heising Nov 1979

Proliferation Resistant Reprocessing Methods, Guna S. Selvaduray, L. Heising

Guna S. Selvaduray

No abstract provided.

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Finding A Site To Store Spent Fuel In The Pacific Basin, Guna S. Selvaduray, M. Goldstein, R. N. Anderson Sep 1979

Finding A Site To Store Spent Fuel In The Pacific Basin, Guna S. Selvaduray, M. Goldstein, R. N. Anderson

Guna S. Selvaduray

No abstract provided.

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Adaptive Nonlinear Image Restoration By A Modified Kalman Filtering Approach, Sarah A. Rajala Jun 1979

Adaptive Nonlinear Image Restoration By A Modified Kalman Filtering Approach, Sarah A. Rajala

Sarah A. Rajala

An adaptive nonlinear Kalman-type filter is presented in this dissertation for the restoration of two-dimensional images degraded by general image formation system degradations and additive white noise. A vector difference evaluation model is used to model the degradation process. The object plane distribution function is partitioned into disjoint regions based on the amount of spatial activity in the image, and difference evaluation models are used to characterize the object plane distribution function.

It is shown that each of the regions can be uniquely characterized by their second order statistics. The autocorrelation function for each region is then used to determine …

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Infiltration Of Liquid Dairy Manure Into Soil, William R. Detar Jan 1979

Infiltration Of Liquid Dairy Manure Into Soil, William R. Detar

William R DeTar

BASIN infiltrometers and double-ring infiltrometers were used on the subsoil of four different soils to determine the infiltration rate of various concentrations of liquid dairy manure. Raw manure was diluted with water by ratios varying from 3:1 to 50:1. The liquid used for most of the tests did not contain the heavy fibers that tend to settle out immediately after mixing. Total solids, St, was the primary measure of concentration, and steady-state infiltration with water, Iw, was the indicator used for the type of soil. It was found that the infiltration rate was proportional to Iw^0.11st^-.67 at one week. All …

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Hidrometalurjide Yeni, Fathi Habashi Jan 1979

Hidrometalurjide Yeni, Fathi Habashi

Fathi Habashi

Turkish translation of F. Habashi, “Recent Advances in Hydrometallurgy,” Proceedings International Mineral Processing Congress, Warsaw, 1979, edited by J. Laskowski, published by Elsevier, pp. 902–935

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Generation Of Horizontally Polarized Shear Waves In Ferromagnetic Materials Using Magnetostrictively Coupled Meander‐Coil Electromagnetic Transducers, R. Bruce Thompson Jan 1979

Generation Of Horizontally Polarized Shear Waves In Ferromagnetic Materials Using Magnetostrictively Coupled Meander‐Coil Electromagnetic Transducers, R. Bruce Thompson

R. Bruce Thompson

A new electromagnetic transducer configuration is described for generating horizontally polarized shear (SH) waves in ferromagnetic materials. The transducer consists of a meander coil and static bias magnetic field parallel to the coil elements. This configuration generates no ultrasonic waves in a nonmagnetic metal since the induced eddy currents are parallel to the bias field and the driving Lorentz forces vanish. However, the configuration provides coupling to SH waves in ferromagnetic materials through magnetostrictive effects. Experimental measurements of the variation of transduction efficiency with bias field in nickel and 4130 steel plate are presented and compared to the efficiency obtained …

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An Elastic‐Wave Ellipsometer For Measurement Of Material Property Variations, R. Bruce Thompson Jan 1979

An Elastic‐Wave Ellipsometer For Measurement Of Material Property Variations, R. Bruce Thompson

R. Bruce Thompson

Electromagnetic‐acoustic transducers (EMAT’s) can excite and detect elastic shear waves with electronically controlled elliptical polarizations. These can be used to construct an ellipsometer for precise measurement of mechanical properties of solids, in analogy to devices presently used in optical studies. The elastic‐wave case differs from the optical case in two important ways. Longitudinal as well as transverse waves will, in general, exist, and the propagation medium, as well as the surfaces, play an important role in determining the system response. A device is described which is designed to avoid the former mode conversion effects on thin plates. The results of …

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Modeling Of Tensile Properties Of Polymer Blends: Ppo/Poly(Styrene-Co-P­ Chlorostyrene), William Macknight, J. R. Fried Dec 1978

Modeling Of Tensile Properties Of Polymer Blends: Ppo/Poly(Styrene-Co-P­ Chlorostyrene), William Macknight, J. R. Fried

William MacKnight

No abstract provided.

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Carboxylation Of A Polypentenamer And Preparation Of Its Hydrogenated Derivatives, William Macknight, H. Tanaka Dec 1978

Carboxylation Of A Polypentenamer And Preparation Of Its Hydrogenated Derivatives, William Macknight, H. Tanaka

William MacKnight

No abstract provided.

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A Dynamic Mechanical Study Of Phase Segregation In Toluene Diisocyanate, Block Polyurethanes, William Macknight, G. A. Senich Dec 1978

A Dynamic Mechanical Study Of Phase Segregation In Toluene Diisocyanate, Block Polyurethanes, William Macknight, G. A. Senich

William MacKnight

No abstract provided.

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A Dynamic Mechanical Study Of The Curing Reaction Of Two Epoxy Resins, William Macknight, G. A. Senich, N. S. Schneider Dec 1978

A Dynamic Mechanical Study Of The Curing Reaction Of Two Epoxy Resins, William Macknight, G. A. Senich, N. S. Schneider

William MacKnight

No abstract provided.

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Poly(Alkylene Oxide) Ionomers Ii: Solution Co- And Terpolymerization Of Trioxane For The Preparation Of Polyoxymethylene Ionomers, William Macknight, L. Demejo, Otto Vogl Dec 1978

Poly(Alkylene Oxide) Ionomers Ii: Solution Co- And Terpolymerization Of Trioxane For The Preparation Of Polyoxymethylene Ionomers, William Macknight, L. Demejo, Otto Vogl

William MacKnight

Solution polymerization of trioxane (TO) with l,3-dioxolane {DO) gave copolymers of various comonomer compositions. TO was also copolymerized with ethyl glycidate (EG) and terpolymerized with DO and EG to polymers of low EG content. The copolymers were acetate endcapped or base treated to give stable co- and terpolymers. The treatment of EG containing polyoxymethylene (POM) copolymers with sodium hydroxide in methanol at elevated temperatures gave POM ionomers. The polymers were characterized by their infrared and PMR spec­tra for their general structure and co-and terpolymer composition. POM co­polymers with only EG as comonomer showed low base stability but those which contained …

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Compatible Glassy Polyblends Based Upon Poly(2,6-Dimethyl-1, 4-Phenylene Oxide): Tensile Modulus Studies, William Macknight, Lothar W. Kleiner, F. E. Karasz Dec 1978

Compatible Glassy Polyblends Based Upon Poly(2,6-Dimethyl-1, 4-Phenylene Oxide): Tensile Modulus Studies, William Macknight, Lothar W. Kleiner, F. E. Karasz

William MacKnight

The mechanical behavior of compatible glassy polyblends based upon poly(2,6-dimethyl-l,4-phenylene oxide) (PPO) was investigated. In particular, the influence of composition, molecular weight, and molecular weight distribution upon the tensile modulus of the blend was assessed. Various possible correlations between the experimentally determined moduli and theory are considered. Included are correlations with den­sity, packing density, composite theory, and lattice fluid theory. The modeling of the properties of mixtures via Simplex lattice design is also presented. Finally, attention is given to the development of compatibility criteria based upon tensile modulus and density measurements. 

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Sulfonation Of A Polypentenamer And Preparation Of Its Hydrogenated Derivatives, William Macknight, D. Rahrig, R. W. Lenz Dec 1978

Sulfonation Of A Polypentenamer And Preparation Of Its Hydrogenated Derivatives, William Macknight, D. Rahrig, R. W. Lenz

William MacKnight

Polypentenamer has been sulfonated using a 1:1 complex of sulfur trioxide and triethyl phosphate in chloroform. A range of polymers containing from 1.9 to 19. l mo! % sulfonate groups was prepared by this reagent and isolated in the form of sodium salts. These materials are initially free from covalent cross-links but cross-linking occurs with aging unless the polymers are stabilized with a free-radical scavenger such as hydroquinone. The unsaturated bonds in these materials can be removed by hydrogenation with p­toluenesulfonyl hydrazide. The hydrogenated derivatives are crystalline and no longer require a stabilizer to inhibit cross-linking. Both the unsaturated and …

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Present Understanding Of The Viscoelastic And Mechanical Properties Of Stereoregular Polymers, William Macknight Dec 1978

Present Understanding Of The Viscoelastic And Mechanical Properties Of Stereoregular Polymers, William Macknight

William MacKnight

No abstract provided.

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