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Molecular Simulation Strategies for Understanding the Degradation Mechanisms of Acrylic Polymers

Description: Article describes how acrylic polymers, commonly used in paints, can degrade over time by several different chemical and physical mechanisms, depending on structure and exposure conditions. In this work, the authors studied the effects of different degradation mechanisms and agents on properties of acrylic polymers found in artists’ acrylic paints for the first time using atomistic molecular dynamics simulations.
Date: April 19, 2023
Creator: Iscen, Aysenur; Forero-Martinez, Nancy C.; Valsson, Omar & Kremer, Kurt
Item Type: Refine your search to only Article
Partner: UNT College of Science
open access

Augmenting Sulfur Metabolism and Herbivore Defense in Arabidopsis by Bacterial Volatile Signaling

Description: Article reports on a previously unidentified mechanism by which the growth-promoting rhizobacterium Bacillus amyloliquefaciens (GB03) transcriptionally activates genes responsible for sulfur assimilation, increasing sulfur uptake and accumulation in Arabidopsis.
Date: April 8, 2016
Creator: Aziz, Mina; Nadipalli, Ranjith K.; Xie, Xitao; Sun, Yan; Surowiec, Kazimierz; Zhang, Jin-Lin et al.
Item Type: Refine your search to only Article
Partner: University of North Texas
open access

Gold and Other Minor Elements Associated with the Hot Springs and Geysers of Yellowstone National Park, Wyoming, Supplemented with Data from Steamboat Springs, Nevada

Description: Report providing information from 125 samples of rock studies, analyzed by using a emission-spectographic method. The studies take place in Yellowstone National Park and Steamboat Springs, Nevada.
Date: 1992
Creator: White, Donald E.; Heropoulos, Chris & Fournier, R. O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Bioaccumulation Potential Of Air Contaminants: Combining Biological Allometry, Chemical Equilibrium And Mass-Balances To Predict Accumulation Of Air Pollutants In Various Mammals

Description: In the present study we develop and test a uniform model intended for single compartment analysis in the context of human and environmental risk assessment of airborne contaminants. The new aspects of the model are the integration of biological allometry with fugacity-based mass-balance theory to describe exchange of contaminants with air. The developed model is applicable to various mammalian species and a range of chemicals, while requiring few and typically well-known input parameters, such … more
Date: March 1, 2009
Creator: Veltman, Karin; McKone, Thomas E.; Huijbregts, Mark A.J. & Hendriks, A. Jan
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Sample extraction and injection with a microscale preconcentrator.

Description: This report details the development of a microfabricated preconcentrator that functions as a fully integrated chemical extractor-injector for a microscale gas chromatograph (GC). The device enables parts-per-billion detection and quantitative analysis of volatile organic compounds (VOCs) in indoor air with size and power advantages over macro-scale systems. The 44 mm{sup 3} preconcentrator extracts VOCs using highly adsorptive, granular forms of graphitized carbon black and carbon molecular sie… more
Date: September 1, 2007
Creator: Robinson, Alex Lockwood (Advanced Sensor Technologies, Albuquerque, NM) & Chan, Helena Kai Lun
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Performance Demonstration Program Plan for Analysis of Simulated Headspace Gases

Description: The Performance Demonstration Program (PDP) for headspace gases distributes blind audit samples in a gas matrix for analysis of volatile organic compounds (VOCs). Participating measurement facilities (i.e., fixed laboratories, mobile analysis systems, and on-line analytical systems) are located across the United States. Each sample distribution is termed a PDP cycle. These evaluation cycles provide an objective measure of the reliability of measurements performed for transuranic (TRU) waste cha… more
Date: November 13, 2007
Creator: Office, Carlsbad Field
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Remaining Sites Verification Package for the 100-D-9 Boiler Fuel Oil Tank Site, Waste Site Reclassification Form 2006-030

Description: The 100-D-9 site is the former location of an underground storage tank used for holding fuel for the 184-DA Boiler House. Results of soil-gas samples taken from six soil-gas probes in a rectangle around the site the tank had been removed from concluded that there were no volatile organic compounds at detectable levels in the area. The 100-D-9 Boiler Fuel Oil Tank Site meets the remedial action objectives specified in the Remaining Sites ROD. The results demonstrated that residual contaminant co… more
Date: August 10, 2006
Creator: Dittmer, L. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Performance Demonstration Program Plan for Analysis of Simulated Headspace Gases

Description: The Performance Demonstration Program (PDP) for headspace gases distributes sample gases of volatile organic compounds (VOCs) for analysis. Participating measurement facilities (i.e., fixed laboratories, mobile analysis systems, and on-line analytical systems) are located across the United States. Each sample distribution is termed a PDP cycle. These evaluation cycles provide an objective measure of the reliability of measurements performed for transuranic (TRU) waste characterization. The prim… more
Date: April 1, 2006
Creator: Office, Carlsbad Field
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Volatile Organic Compound Investigation Results, 300 Area, Hanford Site, Washington

Description: Unexpectedly high concentrations of volatile organic compounds (VOC) were discovered while drilling in the unconfined aquifer beneath the Hanford Site’s 300 Area during 2006. The discovery involved an interval of relatively finer-grained sediment within the unconfined aquifer, an interval that is not sampled by routine groundwater monitoring. Although VOC contamination in the unconfined aquifer has been identified and monitored, the concentrations of newly discovered contamination are much high… more
Date: July 7, 2008
Creator: Peterson, Robert E.; Williams, Bruce A. & Smith, Ronald M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Office of FreedomCAR and Vehicle Technologies Health Impacts Program (Poster)

Description: We evaluated day-of-week differences in mean concentrations of ozone precursors [nitric oxide (NO), nitrogen oxides (NOx), volatile organic compounds (VOC) and carbon monoxide (CO)] at monitoring sites in 23 states comprising seven geographic focus areas for the years 1998-2003. We used Wednesdays to represent weekdays and Sundays to represent weekends; we also analyzed Saturdays. Statistical t-tests applied to every monitor showed substantial and statistically significant differences between W… more
Date: August 1, 2006
Creator: Lawson, D. R. & Eberhardt, J. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Expanding the Allowable TRUPACT-II Payload

Description: The partnership between the Carlsbad Field Office (CBFO) and the TRU and Mixed Waste Focus Area (TMFA) was rewarded when several long-term projects came to fruition. The Nuclear Regulatory Commission (NRC) removed some of the conservatism in the TRUPACT-II Safety Analysis Report for Packaging (SARP) with their approval of Revision 19. The SARP strictly limits the payload constituents to ensure that hydrogen gas and other flammable volatile organic compounds (VOCs) don't build up to flammable/ex… more
Date: August 1, 2002
Creator: St Michel, Whitney Dorothea & Lott, Sheila
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Chemiresistor microsensors for in-situ monitoring of volatile organic compounds : final LDRD report.

Description: This report provides a summary of the three-year LDRD (Laboratory Directed Research and Development) project aimed at developing microchemical sensors for continuous, in-situ monitoring of volatile organic compounds. A chemiresistor sensor array was integrated with a unique, waterproof housing that allows the sensors to be operated in a variety of media including air, soil, and water. Numerous tests were performed to evaluate and improve the sensitivity, stability, and discriminatory capabiliti… more
Date: September 1, 2003
Creator: Thomas, Michael Loren; Hughes, Robert Clark; Kooser, Ara S.; McGrath, Lucas K.; Ho, Clifford Kuofei; Wright, Jerome L. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Preliminary Environmental Flow and Transport Modeling at the INEEL

Description: The Idaho National Engineering and Environmental Laboratory (INEEL) is located in southeastern Idaho in the USA. The primary mission since the laboratory was founded in 1949 has been nuclear reactor research. Fifty-two reactors have been built and operated on the INEEL. Other principal activities at the laboratory have been reprocessing of spent nuclear fuel. Low-level radioactive waste generated on site and mixed and transuranic waste from the Rocky Flats plutonium processing facility in Color… more
Date: September 1, 1999
Creator: Magnuson, Swen O; Mccarthy, James Michael & Navratil, James Dale
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A low-power pressure-and temperature-programmed separation system for a micro gas chromatograph.

Description: This thesis presents the theory, design, fabrication and testing of the microvalves and columns necessary in a pressure- and temperature-programmed micro gas chromatograph ({micro}GC). Two microcolumn designs are investigated: a bonded Si-glass column having a rectangular cross section and a vapor-deposited silicon oxynitride (Sion) column having a roughly circular cross section. Both microcolumns contain integrated heaters and sensors for rapid, controlled heating. The 3.2 cm x 3.2 cm, 3 m-lon… more
Date: October 1, 2006
Creator: Sacks, Richard D. (University of Michigan, Ann Arbor, MI); Robinson, Alex Lockwood (Advanced Sensor Technologies, Albuquerque, NM); Lambertus, Gordon R. (University of Michigan, Ann Arbor, MI); Potkay, Joseph A. (University of Michigan, Ann Arbor, MI) & Wise, Kensall D. (University of Michigan, Ann Arbor, MI)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Extended Research on Detection of Deception Using Volatile Organic Compound (VOC) Emissions

Description: A system that captures and analyzes volatile organic compound (VOC) emissions from skin surfaces may offer a viable alternative method to the polygraph instrument currently in use for detecting deception in U.S. government settings. Like the involuntary autonomic central nervous system response data gathered during polygraph testing, VOC emissions from the skin may provide data that can be used to detect stress caused by deception. Detecting VOCs, then, may present a noninvasive, non-intrusive … more
Date: June 1, 2006
Creator: Studies, Center for Human Reliability
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A study of the impact of unconventional sources within a large urban area: evidence from spatio-temporal assessment of volatile organic compounds.

Description: Conventional sources of emissions have been a prime target for policymakers in designing pollution control strategies. However, the evolution of shale gas activities is a growing concern over the impact of unconventional sources on urban and regional air quality. Owing to the development of Barnett Shale production, the fast-growing Dallas-Fort Worth (DFW) metroplex has encountered both types of these emissions. Oil and gas activities result in emissions of ozone precursors, notably volatile or… more
Date: May 2016
Creator: Matin, Maleeha
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Energy Efficient Removal of Volatile Organic Compounds (VOCs) and Organic Hazardous Air Pollutants (o-HAPs) from Industrial Waste Streams by Direct Electron Oxidation

Description: This research program investigated and quantified the capability of direct electron beam destruction of volatile organic compounds and organic hazardous air pollutants in model industrial waste streams and calculated the energy savings that would be realized by the widespread adoption of the technology over traditional pollution control methods. Specifically, this research determined the quantity of electron beam dose required to remove 19 of the most important non-halogenated air pollutants fr… more
Date: October 19, 2011
Creator: Testoni, A. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Using Downhole Probes to Locate and Characterize Buried Transuranic and Mixed Low Level Waste

Description: Borehole logging probes were developed and tested to locate and quantify transuranic elements in subsurface disposal areas and in contaminated sites at USDOE Weapons Complex sites. A new method of measuring very high levels of chlroine in the subsurface was developed using pulsed neutron technology from oilfield applications. The probes were demonstrated at the Hanford site in wells containing plutonium and other contaminants.
Date: June 25, 2012
Creator: Steinman, Donald K; Bramblett, Richard L & Hertzog, Russel C
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Modeling the reversible sink effect in response to transient contaminant sources

Description: A physically based diffusion model is used to evaluate the sink effect of diffusion-controlled indoor materials and to predict the transient contaminant concentration in indoor air in response to several time-varying contaminant sources. For simplicity, it is assumed the predominant indoor material is a homogeneous slab, initially free of contaminant, and the air within the room is well mixed. The model enables transient volatile organic compound (VOC) concentrations to be predicted based on th… more
Date: February 1, 2001
Creator: Zhao, Dongye; Little, John C. & Hodgson, Alfred T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Reducing VOC Press Emission from OSB Manufacturing

Description: Current regulations require industry to meet air emission standards with regard to particulates, volatile organic compounds (VOCs), hazardous air pollutants (HAPs) and other gases. One of many industries that will be affected by the new regulations is the wood composites industry. This industry generates VOCs, HAPs, and particulates mainly during the drying and pressing of wood. Current air treatment technologies for the industry are expensive to install and operate. As regulations become more … more
Date: December 31, 2001
Creator: McGinnis, Gary D.; WIlliams, Laura S.; Monte, Amy E.; Niemi, Brett A. & Flicker, Thomas M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Expanding the Allowable TRUPACT-II Payload

Description: The partnership between the Carlsbad Field Office (CBFO) and the TRU and Mixed Waste Focus Area (TMFA) was rewarded when several long-term projects came to fruition. The Nuclear Regulatory Commission (NRC) removed some of the conservatism in the TRUPACT-II Safety Analysis Report for Packaging (SARP) with their approval of Revision 19. The SARP strictly limits the payload constituents to ensure that hydrogen gas and other flammable volatile organic compounds (VOCs) don't build up to flammable/ex… more
Date: May 16, 2002
Creator: St. Michel, W. (INEEL) & Lott, S. (LANL-Carlsbad Operations)
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Corrective Action Investigation Plan for Corrective Action Unit 410: Waste Disposal Trenches, Tonopah Test Range, Nevada, Revision 0 (includes ROTCs 1, 2, and 3)

Description: This Corrective Action Investigation Plan contains the U.S. Department of Energy, National Nuclear Security Administration Nevada Operations Office's approach to collect the data necessary to evaluate corrective action alternatives appropriate for the closure of Corrective Action Unit (CAU) 410 under the Federal Facility Agreement and Consent Order. Corrective Action Unit 410 is located on the Tonopah Test Range (TTR), which is included in the Nevada Test and Training Range (formerly the Nellis… more
Date: July 16, 2002
Creator: United States. National Nuclear Security Administration. Nevada Operations Office.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Corrective Action Investigation Plan for Corrective Action Unit 127: Areas 25 and 26 Storage Tanks, Nevada Test Site, Nevada (Rev. No.: 0, August 2002)

Description: This Corrective Action Investigation Plan (CAIP) contains the U.S. Department of Energy, National Nuclear Security Administration Nevada Operations Offices's approach to collect the data necessary to evaluate corrective action alternatives appropriate for the closure of Corrective Action Unit (CAU) 127 under the Federal Facility Agreement and Consent Order. Corrective Action Unit 127 is located on the Nevada Test Site approximately 65 miles northwest of Las Vegas, Nevada. This CAU is comprised … more
Date: August 27, 2002
Creator: United States. National Nuclear Security Administration. Nevada Operations Office.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Predicted concentrations in new relocatable classrooms of volatile organic compounds emitted from standard and alternate interior finish materials

Description: Relocatable classrooms (RCs) are widely employed by California school districts to satisfy rapidly expanding space requirements due to population growth and class size reduction policies. There is public concern regarding indoor environmental quality (IEQ) in schools, particularly in RCs, but very little data to support or dispel these concerns. Several studies are investigating various aspects of IEQ in California schools. This laboratory-based study focused on evaluating the emissions of toxi… more
Date: July 1, 2001
Creator: Hodgson, Alfred T.; Fisk, William J.; Shendell, Derek G. & Apte, Michael G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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