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Year
Month
Density of Electronic States in $Alpha$-Phase in Alloys Containing Cd and Sn.
None
Date:
January 1, 1970
Creator:
Phillips, N. E.; Brock, J. C.F.; Lambert, M. H. & Merriam, M. F.
System:
The UNT Digital Library
Deposition of plutonium in the lung of a worker following an accidental inhalation exposure
The deposition of PuO/sub 2/ in the lungs of an occupationally exposed worker is characterized by assay for plutonium in excreta samples and from in vivo measurements of /sup 241/Am in the thoracic region. Chelation therapy by intravenous injection of 1 gm Ca-DTPA was initially performed shortly after the incident and repeated using 0.5 gm of the chelate four additional times in subsequent days post intake. Analysis of the air sampler filter retrieved from the site of the exposure identified the isotopic composition and particle size of the plutonium material inhaled by the worker. Chelation with Ca-DTPA did not significantly reduce the magnitude of the lung or systemic deposition as determined from assay of plutonium in urine samples collected from the worker. In vivo measurements for /sup 241/Am verify the retention of the inhaled material in the lung and also indicate the ingrowth of an amount of /sup 241/Am as a daughter product of the /sup 241/Pu initially inhaled.
Date:
unknown
Creator:
Spitz, H.B. & Robinson, B.
System:
The UNT Digital Library
Descansos (Roadside Crosses): Folk Art and Ritual in Remembrance of the Deceased
Paper discussing the role of descansos (roadside crosses), a form of religious folk art, in the lives of Hispanics in the Southwest. A bibliography is included.
Date:
unknown
Creator:
Graham, Joe Stanley, 1940-1999
System:
The Portal to Texas History
Description of inelastic (p,p') scattering
None
Date:
January 1, 1970
Creator:
Schaeffer, R
System:
The UNT Digital Library
Detergentes y Biodetergentes en la Biorremediación de Suelo: Inconsistencias y Evidencias
This article analyzes the bioremediation of the soil contaminated by hydrocarbons (HYCOS), the importance of biostimulation with a detergent (DEGE) or biodetergent (BIODET) and the inconsistencies generated by their application.
Date:
August 28, 2020
Creator:
Saucedo-Martínez, Blanca Celeste; Márquez-Benavides, Liliana; Santoyo-Pizano, Gustavo & Sánchez-Yáñez, Juan Manuel
System:
The UNT Digital Library
Developing a Theory in Academic Research: A Review of Experts' Advice
This article provides a literature review on definitions and characteristics of theory development.
Date:
September 9, 2015
Creator:
Dankasa, Jacob
System:
The UNT Digital Library
Development of the standard inhalation chamber. [Brief review]
Various designs of inhalation chambers developed since the Manhattan Project are discussed. Essential features of current inhalation chambers are illustrated. It is stated that technology is available to control almost any variable in inhalation studies, although cost factors must be taken into consideration when experiments are designed. (JGB)
Date:
unknown
Creator:
Drew, R T
System:
The UNT Digital Library
DI-TERTIABYBUTYLNITROXIDE, A HILL REAGENT
Di-tertiarybutylnitroxide (DTBN), which they have tried to use as a trapping agent to identify the species giving rise to the photo-induced EPR signals in photosynthetic materials, functions as a Hill reagent with spinach chloroplasts. Evidence is presented which indicates that the reduction of DTBN is affected by photosystem II of the electron transport system of spinach chloroplasts. The reduced form of DTBN, the hydroxylamine, undergoes a photo-oxidation with spinach chloroplasts. Possible explanations of this apparent inconsistency are presented. A product which could be ascribed to a chemical coupling reaction between the nitroxide and the radical species giving rise to the photo-induced EPR signals in spinach chloroplasts was not detected, even using radioactive tracer methods.
Date:
January 1, 1970
Creator:
Corker, Gerald A.; Klein, Melvin P.; La Font, Didier & Calvin,Melvin.
System:
The UNT Digital Library
Direct measurement of the fraction of radon loss in ceramics by gamma-ray spectroscopy
Work is reported which deals with an alternative method of measuring the amount of radon loss in ceramics and clays and results from several types of sherds are presented. The gamma rays emitted by all the radioisotopes naturally present in sherds were measured, the gamma emission rates from radioisotopes preceding and following the radon in the natural series were calculated, and these rates in cases where the escape of radon was (a) prevented and (b) favored were compared. Results indicate that there was no radon loss within the accuracy limits of the experiment for any of the samples during a pumping period of up to 24 days. This rules out the possibility of appreciable radon diffusion with a diffusion mean life less than an order of magnitude greater than the half life of /sup 222/Rn for these sherds. In addition, two samples of powder were specifically included to see if crushed sherds or unfired clay would influence radon loss. There was no observable radon loss with these samples.
Date:
unknown
Creator:
Carriveau, G W & Harbottle, G
System:
The UNT Digital Library
Effect of acute and chronic hypoxia on the swimming performance, metabolic capacity and cardiac function of Atlantic cod (Gadus morhua)
Article exploring the degree to which diminished cardiac function contributes to the reduction in fish swimming performance concomitant with acute exposure to hypoxia and how fish cardiorespiratory physiology is altered by, or adapts to, chronic hypoxia. Results provide important insights into how fish cardiorespiratory physiology is impacted by short-term and prolonged exposure to hypoxia, and highlight the capacity of the fish cardiorespiratory system to deal with environmental challenges.
Date:
November 23, 2009
Creator:
Petersen, L. H. & Gamperl, A.K.
System:
The UNT Digital Library
Efficiency Comparison of Variably-Spaced, Non-Pumped Wells for Filtering Polluted Groundwater
This article investigates the capability of variably-spaced arrays of non-pumped wells, filled with reactive media, to filter a hypothetical contaminant plume.
Date:
2009
Creator:
Hudak, Paul F.
System:
The UNT Digital Library
Electrical and Thermal Conductivity of Polylactic Acid (PLA)-Based Biocomposites by Incorporation of Nano-Graphite Fabricated with Fused Deposition Modeling
This article aims to improve the electrical and thermal conductivity of the polylactic acid/wood flour/ thermoplastic polyurethane composites by Fused Deposition Modeling (FDM).
Date:
March 22, 2019
Creator:
Guo, Rui; Ren, Zechun; Bi, Hongjie; Xu, Min & Cai, Liping
System:
The UNT Digital Library
An electropolymerized molecularly imprinted polymer for selective carnosine sensing with impedimetric capacity
This article describes a chemosensor with a molecularly imprinted polymer (MIP) film as the recognition unit selective to a carnosine biomarker.
Date:
October 29, 2015
Creator:
Wojnarowicz, Agnieszka; Sharma, Piyush S.; Sosnowska, Marta; Lisowski, Wojciech; Huynh, Tan-Phat; Pszona, Maria et al.
System:
The UNT Digital Library
The Empowerment of Women in the Fidencista Movement
Paper discussing the significant roles of women in the Fidencista movement and why they have assumed such important roles in it. Additionally, a brief history of the movement as a whole is provided.
Date:
unknown
Creator:
Graham, Joe Stanley, 1940-1999
System:
The Portal to Texas History
Energetic control of intact chloroplast photosynthesis
The induction phase of photosynthesis was studied in intact chloroplasts isolated from spinach. Within 15 sec of illumination, stromal ADP is phosphorylated to give an ATP/ADP ratio of 1.4. A transthylakoid pH gradient of about 4.1 units developed during the first min, and was associated with a low note of linear electron flow from H/sub 2/O to NADP/sup +/. In the following 2 to 3 min, both the pH gradient and ATP/ADP ratio declined to new steady state levels (3.9 pH units and a ratio of 0.9), whereas O/sub 2/ evolution rose rapidly to 110 ..mu..mol/mg chlorophyll-h. Prolonging the induction phase by omission of catalase or by addition of 2 mM phosphate resulted in a high pH gradient and ATP/ADP ratio. Ribose 5-phosphate is known to reverse partial inhibition resulting from catalase omission or high phosphate, hence its effect on the pH gradient and ATP/ADP ratio was investigated. Ribose 5-phosphate was found to lower both these parameters under conditions chosen to restrict turnover of the carbon cycle. This result with ribose 5-phosphate underscores the importance of its product, ribulose 5-phosphate and the carboxylation product, 3-phosphoglycerate, in serving as sinks for ATP and thereby preventing inhibition of electron flow by an …
Date:
unknown
Creator:
Slovacek, R E & Hind, G
System:
The UNT Digital Library
Enhanced gasification of wood in the presence of mixed catalysts
Experimental results obtained in laboratory investigations of steam gasification of wood in the presence of mixed catalysts are presented. These studies are designed to test the technical feasibility of producing specific gaseous products from wood by enhancing its reactivity and product specificity through the use of combined catalysts. The desired products include substitute natural gas, hydrocarbon synthesis gas and ammonia synthesis gas. The gasification reactions are controlled through the use of specific catalyst combinations and operating parameters. A primary alkali carbonate gasification catalyst impregnated into the wood combined with specific commercially available secondary catalysts produced the desired products. A yield of 50 vol % methane was obtained with a randomly mixed combination of a commercial nickel methanation catalyst and silica-alumina cracking catalyst at a weight ratio of 3:1 respectively. Steam gasification of wood in the presence of a commercial Si-Al cracking catalyst produced the desired hydrocarbon synthesis gas. Hydrogen-to-carbon monoxide ratios needed for Fischer-Tropsch synthesis of hydrocarbons were obtained with this catalyst system. A hydrogen-to-nitrogen ratio of 3:1 for ammonia synthesis gas was achieved with steam-air gasification of wood in the presence of catalysts. The most effective secondary catalyst system employed to produce the ammonia synthesis gas included two commercially …
Date:
unknown
Creator:
Weber, S. L.; Mudge, L. K.; Sealock, L. J. Jr.; Robertus, R. J. & Mitchell, D. E.
System:
The UNT Digital Library
Epidemiological modelling of vaccination and reduced funeral rites interventions on the peproduction number, R₀ of Ebola virus disease in West Africa
This article examines the impacts of control measures on the reproduction number of the Ebola virus using a mathematically-based computational model. Specifically, the authors study the effects of vaccination and reduced funeral rites. This model could be used to forecast the duration of an Ebola epidemic in any country.
Date:
July 25, 2018
Creator:
Akwafuo, Sampson; Guo, Xuan & Mikler, Armin R.
System:
The UNT Digital Library
The Esthetic Value of the Mayan Reliefs of the Old Empire
"The Esthetic Value of the Mayan Reliefs of the Old Empire" by Salvador Toscano. The backside of the article is curriculum for teaching first and secondary art education.
Date:
19XX
Creator:
Toscano, Salvador
System:
The UNT Digital Library
An Examination of the Texas Episodic Model and Its Time-Saving Table Interpolation Scheme
"This paper discusses a model developed by the Texas Air Control Board to expedite the air quality studies required by the state permitting process" (p. 1).
Date:
198X
Creator:
Texas Air Control Board
System:
The Portal to Texas History
Examining the Progression of Mobile Technologies and Their Applications to Learning Environment: Implications for M-Learning in Africa
This article provides a literature review regarding mobile technology used for mobile learning in Africa.
Date:
June 19, 2014
Creator:
Dankasa, Jacob
System:
The UNT Digital Library
Expectations and problems of an on-line mass separator project on a high intensity accelerator (LAMPF)
None
Date:
January 1, 1970
Creator:
Dropesky, B.J. & Erdal, B.R.
System:
The UNT Digital Library
['An eye for art' article in Plano Star Courier]
An article written by Valerie Barna titled 'An eye for art' for the Plano Star Courier. The piece covers art education through Visual Literacy being taught in Kim Gill's Christie Elementary classroom. Gill learned this process while attending a Summer Institute through NTIEVA.
Date:
199X
Creator:
Barna, Valerie
System:
The UNT Digital Library
Facile and Regioselective C H Bond Activation of Aromatic Substrates by an Fe (II) Complex Involving a Spin-Forbidden Pathway
Article discussing facile and regioselective C H bond activation of aromatic substrates by an Fe(II) complex involving a spin-forbidden pathway.
Date:
February 27, 2013
Creator:
Kalman, Steven E.; Petit, Alban; Gunnoe, T. Brent; Ess, Daniel H.; Cundari, Thomas R., 1964- & Sabat, Michal
System:
The UNT Digital Library
Failure analysis of an elbow tube fitting
This article discusses elbow tube fitting. Abstract: Safe operation of machinery depends strongly on the design of the system and the employement of proper components and materials. Unique to fluid powered systems are the proper selection of hydraulic lines, fittings, and control valves. This paper describes the cause of fracture in an elbow tube fittings due to deficiencies in the dimensional design and materials selection. The investigation included metallography, fractography, hardness testing and metrology. The results showed that the material was low carbon steel subjected to cold forming and normalized annealing processes during tube production. There were dimensional variations in the tube and the material strength was low.
Date:
August 24, 2002
Creator:
Mirshams, Reza A. & Sabbaghian, Mehdy
System:
The UNT Digital Library