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Water Resources Research Program: Pollution of Coastal Waters Off Chicago by Sinking Plumes From the Indiana Harbor Canal

Description: On March 2, 1977, during sinking-plume conditions, a portion of the water of the Indiana Harbor Canal (IHC) was injected with samarium and rhodamine-dye tags and a section of the IHC's surface was covered with simulated oily waste tagged with dysprosium. Water samples were taken downcurrent, over a 54-hr period, from a vessel and from the raw-water streams from the intakes at Chicago's South Water Filtration Plant (SWFP). Bottom currents and water temperatures were measured almost continuously … more
Date: December 1, 1977
Creator: Harrison, W.; McCown, D. L.; Raphaelian, L. A. & Saunders, K. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Energy transfer mechanisms in photobiological reactions. Final report, 1 April 1960--31 March 1979. [Photodynamic processes in selected biomolecules]

Description: This project was concerned primarily with studies of the mechanisms of the sensitized photooxidation of selected biomolecules using a variety of phtosensitizers. Such reactions are often termed photodynamic processes. In particular we have carried out steady-state kinetic studies, flash photolysis and spectral studies, and product formation studies of the sensitized photooxidation of the five susceptible amino acids (cycteine, histidine, methonine, tryptophan, and tyrosine) and their derivative… more
Date: March 31, 1979
Creator: Spikes, J.D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Laser photochemical reaction dynamics in formaldehyde

Description: Appearance rate constants of molecular photochemical products were measured following laser photolysis of formaldehyde in the near ultraviolet. The pressure dependence of appearance rates was studied for three formaldehyde isotopic species: H/sub 2/CO, HDCO, and D/sub 2/CO. The effect of added foreign gases on those rates in H/sub 2/CO has been determined for He, Ar, Xe, and NO. The energy dependence of photodissociation rates has been examined following laser photolysis at 354.7 and 299.1 nm a… more
Date: August 1, 1978
Creator: Zughul, M.B.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Photochemistry and enzymology of photosynthesis. Progress report, April 1, 1978--August 31, 1978

Description: Progress is reported in the following areas of research: light harvesting and electron transport in C/sub 4/ plants; mass spectrometer studies; measurements in flashing light; spectrophotometric studies; and, redox titration of the plastoquinone pool. (JGB)
Date: August 1, 1978
Creator: Kok, B.; Fowler, C. F.; Golbeck, J.; Radmer, R. J. & Velthuys, B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Durability of adhesive bonds to uranium alloys, tungsten, tantalum, and thorium. [U--Nb; Ta--10 percent W]

Description: Long-term durability of epoxy bonds to alloys of uranium (U-Nb and Mulberry), nickel-plated uranium, thorium, tungsten, tantalum, tantalum--10 percent tungsten, and aluminum was evaluated. Significant strengths remain after ten years of aging; however, there is some evidence of bond deterioration with uranium alloys and thorium stored in ambient laboratory air.
Date: June 14, 1975
Creator: Childress, F. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Hydrolytic stability of Adiprene L-100 and alternate materials. Final report

Description: Adiprene L-100/MOCA (E. I. du Pont de Nemours and Company) and four potential alternate materials were tested after accelerated aging conditions in a steam autoclave. Test methods included: mechanical spectrometry, thermomechanical analysis, infrared analysis, solubility in tetrahydrofuran, and gel permeation chromatography. Conathane EN-7 was the most resistant to accelerated attack by steam hydrolysis and showed little change in properties after 50 hours exposure.
Date: August 1, 1976
Creator: Caruthers, D. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Material and processing comparisons of four conformal coatings. Final report

Description: This evaluation compares the processing and properties of four materials in common use as conformal coatings. The processes were optimized to obtain the highest level of electrical properties and direct comparisons of physical properties at three temperatures are included. A design manual, BDX-613-1216, was developed as part of this effort.
Date: March 1, 1977
Creator: Caruthers, D. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Alternate Materials of Construction for Geothermal Applications. Progress Report No. 12, January--March 1977

Description: A program to determine if concrete polymer materials can be utilized as materials of construction in geothermal processes is in progress. To date, several high temperature polymer concrete systems have been formulated, laboratory and field tests performed in brine, flashing brine, and steam at temperatures up to 260/sup 0/C (500/sup 0/F), and economic studies started. Laboratory data for exposure times up to 2 years are available. Results are also available from field exposures of up to 12 mont… more
Date: January 1, 1977
Creator: Kukacka, L. E.; Sugama, T.; Fontana, J.; Horn, W. & Amaro, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

ESR study of radiation damage in pyrimidines. Progress report, August 1, 1975--April 1, 1976

Description: The primary objective of this project is to develop general mechanisms for radiation damage to biomolecules using substituted pyrimidines as a model system. Results this year include a single crystal ESR study of 5-ethyl-5-isopropylbarbituric acid, development of the k-band microwave bridge, dose response measurements on methylated barbituric acid derivatives, and synthesis of several specifically deuterated uracil derivatives.
Date: April 1, 1976
Creator: Benson, B. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Dielectric analysis of an epoxy preimpregnated materal

Description: The introduction to the principles of dielectric analysis as it relates to the cure mechanism of a preimpregnated material is given. The relationship between dielectric behavior and polymer response is also discussed. Dissipation versus time and temperature curves are presented and their relationship to production cycles and extent of cure analysis is shown. (auth)
Date: January 1, 1976
Creator: Walker, J. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Stemming options and their effect on containment

Description: In more than 17 years of studying underground nuclear explosions, LLL has developed containment procedures that include a stemming plan. Stemming plans can be divided into either layered or continuous forms. There are marked differences between standards for these forms. The materials used in the continuous plan must meet more stringent specifications; as a consequence, they are more expensive. Both plans have been successful since the Baneberry Event. Both plans must meet the following require… more
Date: June 23, 1976
Creator: Day, J. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation of crown compounds in solvent extraction of metals

Description: Unexpectedly low results were obtained for extraction of chlorides, perchlorates, nitrates, and thiocyanates of alkalis, alkaline earths, and actinides from aqueous solutions by water-immiscible solutions of crown ethers. The expected preference for ions matching the crown ether hole-size was not seen here or in solubilizing dry alkali chlorides. Addition of an organic-soluble acid increased alkali extraction, with preference for the ion sized to fit the crown ether. Addition of an organic-solu… more
Date: January 1, 1977
Creator: McDowell, W. J. & Shoun, R. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Glass transition temperatures of epoxy resins by pulsed nuclear magnetic resonance spectroscopy

Description: Pulsed nuclear magnetic resonance spectroscopy has been used to measure the glass transition temperatures of cured epoxy resins. These measurements make it possible to monitor the cure and determine the glass transition temperature as a function of the curing conditions and the concentration of the components. Knowledge of the glass transition temperature of the cured epoxies allows screening of them for a number of uses, including adhesives and coatings operations.
Date: April 21, 1976
Creator: Rutenberg, A. C.; Dorsey, G. F. & Peck, C. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Characterizing cinder rock with the scanning electron microscope. [From in-situ retorting]

Description: Friable cinder rock was examined by scanning electron microscopy and energy dispersive x-ray analysis (SEM/ED). The technique consisted of impregnating the rock with epoxy resin and then locating porosity sites by the presence of epoxy. The resin was identified in the sample by correlating beam damage and elemental analysis by x-ray fluorescence (ED) with a characteristic phase in the SEM image. Analyses of this type should be useful in interpreting experiments designed to simulate in situ reto… more
Date: February 28, 1977
Creator: Casey, A. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Electron Transfer at Sensitized Semiconductor Electrodes

Description: Electron transfer from the excited state of sensitizing dyes to the conduction band of semiconductors has been studied through photoelectrochemical techniques. Two systems were analyzed in detail: rhodamine B on ZnO and rose bengal on TiO/sub 2/. Prior to electrochemical experimentation, the adsorption characteristics of these dyes were investigated using ZnO, ZnS, and TiO/sub 2/ single crystals as substrates. Absorbance measurements of the adsorbed dye were taken as a function of the solution … more
Date: March 1977
Creator: Spitler, Mark Thomas
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
open access

Determination of the kinetics of curing and the heat capacity of an epoxy resin by differential scanning calorimetry

Description: Two techniques were developed for determining the kinetic parameters of chemical reactions from differential scanning calorimeter data. In one technique, variation with time of the heat gain or loss as reactions proceed can be used to determine the order, rate constant, activation energy, and heat of reaction. In the second technique, variation with time of the glass transition temperature of certain materials can be used to determine the order, rate constant, and activation energy. An applicat… more
Date: August 1, 1976
Creator: Basford, J. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Cure analysis of an adhesive primer. [BR-125, a modified nitrile epoxy]

Description: Selection of a cure cycle is generally based on the results of extensive physical properties tests. The advent of dielectric analysis provides the means of accurately predicting cure schedules without this extensive testing. Dielectric analysis is based on the reaction of the dipoles within a polymer to an alternating electric field. As the field alternates the dipoles attempt to swivel in step but are restricted because of their relatively fixed position within the polymeric structure. Capacit… more
Date: August 1, 1976
Creator: Hubach, J. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Radiation stability of a hydrogen getter material (DPPE). [Dimerized phenyl propargyl ether containing Pd on CaCO/sub 3/ catalyst]

Description: An investigation was made on a hydrogen getter material (DPPE) to determine its radiation stability. Such material has potential for nuclear industry applications. The material is composed of 75 percent of an unsaturated organic compound (1,6-diphenoxy-2,4-hexadiyne) and 25 percent catalyst (5 percent palladium on calcium carbonate). The radiation stability of this material and of the hydrogenated product was determined by exposing them to gamma radiation in air and vacuum and analyzing for rad… more
Date: October 18, 1976
Creator: Kazanjian, A. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Temperature dependent properties of potting materials. Final report

Description: The physical properties: mechanical, electrical, and thermal of a general purpose epoxy potting compound, filled with either glass microspheres, aluminum oxide or beta-eucryptite and catalyzed with either an aliphatic amine, a liquid aromatic amine eutectic blend, or a liquid anhydride are discussed. The properties of a CTBN modified epoxy are also included. Twelve formulation-cure cycle combinations were chosen for evaluation. The temperature dependent properties from -65/sup 0/ to 400/sup 0/F… more
Date: April 1, 1976
Creator: Walker, J. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Specifications for several epoxy resins and hardeners used in filament winding

Description: Specifications are reported which were developed for several epoxy resins and hardeners used in filament winding. The specifications are concise, aimed at testing convenience, and contain the minimum number of tests necessary to define the material.
Date: May 3, 1976
Creator: Penn, L. S. & Newey, H. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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