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Effects of chemical modifications on photophysics and exciton dynamics on {pi}-conjugation attenuated and metal-chelated photoconducting polymers
Effects of two types of chemical modifications on photoconducting polymers consisting of polyphenylenevinylene (PPV) derivatives are studied by static and ultrafast transient optical spectroscopy as well as semi-empirical ZINDO calculations. The first type of modification inserts 2,2{prime}-bipyridyl-5-vinylene units (bpy V) in the PPV backbone, and the second type involves metal-chelation with the bpy sites. Photoluminescence and exciton dynamics of polymers 1 and 2 with PV:bpyV ratios of 1 and 3 were examined in solution, and compared to those of the homopolymer, poly(2,5-bis(2{prime}-ethylhexyloxy)-1,4-phenylenevinylene) (BEH-PPV). Similar studies were carried out for several metal-chelated polymers. These results can be explained by changes in {pi}-conjugation throughout the polymer backbone. The attenuation in {pi}-conjugation by the chemical modifications transforms a conducting polymer from one-dimensional semiconductor to molecular aggregates.
Date:
March 11, 2000
Creator:
Chen, L. X.; Jager, W. J. H.; Gosztola, D. J.; Niemczyk, M. P. & Wasielewski, M. R.
Object Type:
Article
System:
The UNT Digital Library
[Funeral Program for Helen Dilworth Adams, March 11, 2000]
Funeral program for Helen Dilworth Adams, born July 8, 1922 and died March 7, 2000. The funeral was held March 11, 2000 at East St. Paul United Methodist Church, officiated by Rev. Barbara Miller. The funeral arrangements were made through Lewis Funeral Home and she was buried in Southern Memorial Park in San Antonio, Texas.
Date:
March 11, 2000
Creator:
unknown
Object Type:
Pamphlet
System:
The Portal to Texas History
[Funeral Program for Helen Dilworth Adams, March 11, 2000]
Funeral program for Helen Dilworth Adams, born July 8, 1922 and died March 7, 2000. The funeral was held March 11, 2000at East St. Paul United Methodist Church, officiated by Rev Barbara Miller. Funeral arrangements were made through the Lewis Funeral Home and buried in Southern Memorial Park Cemetery.
Date:
March 11, 2000
Creator:
unknown
Object Type:
Pamphlet
System:
The Portal to Texas History
Pawhuska Journal-Capital (Pawhuska, Okla.), Vol. 90, No. 21, Ed. 1 Saturday, March 11, 2000
Semiweekly newspaper from Pawhuska, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 11, 2000
Creator:
Gann, Sherry
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
RARE KAON DECAYS.
None
Date:
March 11, 2000
Creator:
LITTENBERG,L.
Object Type:
Article
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 101, No. 309, Ed. 1 Sunday, March 11, 2001
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 11, 2001
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Alvin Sun-Advertiser (Alvin, Tex.), Vol. 110, No. 20, Ed. 1 Sunday, March 11, 2001
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
March 11, 2001
Creator:
Schwind, Jim & Holton, Kathleen
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 79, No. 105, Ed. 1 Sunday, March 11, 2001
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
March 11, 2001
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Express-Star (Chickasha, Okla.), Ed. 1 Sunday, March 11, 2001
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 11, 2001
Creator:
Bush, Kent
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Levelland and Hockley County News-Press (Levelland, Tex.), Vol. 23, No. 99, Ed. 1 Sunday, March 11, 2001
Semiweekly newspaper from Levelland, Texas that includes local, state, and national news along with advertising.
Date:
March 11, 2001
Creator:
Rigg, John
Object Type:
Newspaper
System:
The Portal to Texas History
[News Clip: Waffle House]
Video footage from the KXAS-TV/NBC 5 television station in Fort Worth, Texas, covering a news story.
Date:
March 11, 2001, 4:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
The Panola Watchman (Carthage, Tex.), Vol. 128, No. 21, Ed. 1 Sunday, March 11, 2001
Semiweekly newspaper from Carthage, Texas that includes local, state, and national news along with advertising.
Date:
March 11, 2001
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Polk County Enterprise (Livingston, Tex.), Vol. 119, No. 20, Ed. 1 Sunday, March 11, 2001
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
March 11, 2001
Creator:
White, Barbara
Object Type:
Newspaper
System:
The Portal to Texas History
Seminole Sentinel (Seminole, Tex.), Vol. 94, No. 42, Ed. 1 Sunday, March 11, 2001
Semiweekly newspaper from Seminole, Texas that includes local, state, and national news along with extensive advertising.
Date:
March 11, 2001
Creator:
Dow, M. Gene & Fisher, David
Object Type:
Newspaper
System:
The Portal to Texas History
[Wheeler Avenue Baptist Church Bulletin: March 11, 2001]
Church bulletin listing the order of worship for the 7:30 and 11:00 Sunday morning services at the Wheeler Avenue Baptist Church, as well as various notes about upcoming events, congregational news, and other information of relevance to church members.
Date:
March 11, 2001
Creator:
Wheeler Avenue Baptist Church (Houston, Tex.)
Object Type:
Pamphlet
System:
The Portal to Texas History
Advanced Reservoir Characterization and Development through High-Resolution 3C3D Seismic and Horizontal Drilling: Eva South Marrow Sand Unit, Texas County, Oklahoma
The Eva South Morrow Sand Unit is located in western Texas County, Oklahoma. The field produces from an upper Morrow sandstone, termed the Eva sandstone, deposited in a transgressive valley-fill sequence. The field is defined as a combination structural stratigraphic trap; the reservoir lies in a convex up -dip bend in the valley and is truncated on the west side by the Teepee Creek fault. Although the field has been a successful waterflood since 1993, reservoir heterogeneity and compartmentalization has impeded overall sweep efficiency. A 4.25 square mile high-resolution, three component three-dimensional (3C3D) seismic survey was acquired in order to improve reservoir characterization and pinpoint the optimal location of a new horizontal producing well, the ESU 13-H.
Date:
March 11, 2002
Creator:
Wheeler,David M.; Miller, William A. & Wilson, Travis C.
Object Type:
Report
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 103, No. 320, Ed. 1 Monday, March 11, 2002
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 11, 2002
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Alvin Sun (Alvin, Tex.), Vol. 111, No. 20, Ed. 1 Monday, March 11, 2002
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
March 11, 2002
Creator:
Schwind, Jim & Holton, Kathleen
Object Type:
Newspaper
System:
The Portal to Texas History
ANALYSIS OF CHP POTENTIAL AT FEDERAL SITES
This document was prepared at the request of the U.S. Department of Energy's (DOE's) Federal Energy Management Program (FEMP) under its Technical Guidance and Assistance and Project Financing Programs. The purpose was to provide an estimate of the national potential for combined heat and power (also known as CHP; cogeneration; or cooling, heating, and power) applications at federal facilities and the associated costs and benefits including energy and emission savings. The report provides a broad overview for the U.S. Department of Energy (DOE) and other agencies on when and where CHP systems are most likely to serve the government's best interest. FEMP's mission is to reduce the cost to and environmental impact of the federal government by advancing energy efficiency and water conservation, promoting the use of renewable energy, and improving utility management decisions at federal sites. FEMP programs are driven by its customers: federal agency sites. FEMP monitors energy efficiency and renewable energy technology developments and mounts ''technology-specific'' programs to make technologies that are in strong demand by agencies more accessible. FEMP's role is often one of helping the federal government ''lead by example'' through the use of advanced energy efficiency/renewable energy (EERE) technologies in its own buildings and …
Date:
March 11, 2002
Creator:
HADLEY, S.W.
Object Type:
Report
System:
The UNT Digital Library
Applications of molecular spectroscopy methods to the study of metal dusting corrosion.
The interrogation of molecular vibrations in crystalline and amorphous solids by Raman and infrared spectroscopy methods can provide a wealth of revealing information concerning the composition, morphology, and spatial distribution of the extant phases. When these measurements are made in situ, such as during processes taking place in extreme environments (e.g., elevated temperature and pressure, oxidizing or reducing), where phases are evolving and/or dissipating, it is also possible to derive kinetic and mechanistic parameters. This paper summarizes the possibilities and limitations involved in using various types of Raman and infrared measurement methods to study metal dusting corrosion. Applications of conventional, microprobe, and imaging molecular spectroscopy approaches are discussed, with examples taken directly from metal dusting investigations. Some perspective is offered concerning the origin of observable condensed matter phonons emanating from the surface films and the carbon particles that accompany carbon dusting on various types of metals and alloys. Concepts for the systematic investigation of carbon dusting chemistry using molecular spectroscopy methods are presented.
Date:
March 11, 2002
Creator:
Maroni, V. A.
Object Type:
Article
System:
The UNT Digital Library
Appropriations for FY2002: Labor, Health and Human Services, and Education
Appropriations are one part of a complex federal budget process that includes budget resolutions, appropriations (regular, supplemental, and continuing) bills, rescissions, and budget reconciliation bills. This report is a guide to one of the 13 regular appropriations bills that Congress passes each year. It is designed to supplement the information provided by the House and Senate Labor, Health and Human Services, and Education Appropriations Subcommittees.
Date:
March 11, 2002
Creator:
Irwin, Paul M.
Object Type:
Report
System:
The UNT Digital Library
Barriers in developing and using simulation-based decision-support software
The need for proper consideration of energy-related performance aspects during building design has been identified since the energy crises of the 1970s. However, energy performance is still considered in a very small fraction of building projects, mainly because proper consideration is very expensive. It requires the use of computational software tools, which are not easy to learn and are time-consuming to use. Several attempts have been made to facilitate the use of energy simulation tools, but none has brought a significant increase in the consideration of energy performance. Energy related performance criteria are still considered only in a small fraction of buildings and, in most cases, after most of the building design is complete. This paper is focused on the main barriers in properly considering energy-related performance aspects in building decisions, which range from sociopolitical, to technical. The paper includes consideration of issues related to the general interest of the building industry in energy performance and environmental impact, current practice trends, modeling capabilities and performance of tools, compatibility of computational models and availability of data. Finally, a strategy for government-industry collaboration towards removing the barriers is presented, along with the main issues that need to be resolved towards potential implementation.
Date:
March 11, 2002
Creator:
Papamichael, Konstantinos & Pal, Vineeta
Object Type:
Article
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 80, No. 105, Ed. 1 Monday, March 11, 2002
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
March 11, 2002
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Brookhaven National Laboratory Perfluorocarbon Tracer Technology: A Proven and Cost Effective Method to Verify Integrity and Monitor Long Term Performance of Walls, Floors, Caps, and Cover Systems.
Currently, containment system failures are detected by monitoring wells downstream of the waste site. Clearly this approach is inefficient, as the contaminants will have migrated from the disposal area before they are detected. Methods that indicate early cover failure (prior to contaminant release) or predict impending cover failure are needed. The Brookhaven National Laboratory (BNL) Perfluorocarbon Tracer (PFT) technology can measure performance changes and integrity losses as the cover ages. This allows early detection of cover failure or pending failure so that repair or replacement can be made before contaminants leave the disposal cell. The PFT technology has been successfully applied to four subsurface barrier problems, one leak detection problem from underground ducts, and one surface cover problem. Testing has demonstrated that the PFTs are capable of accurately detecting and locating leaks down to fractions of an inch. The PFT technology has several advantages over competing approaches. The ability to simultaneously use multiple PFTs separates it from other gas tracer technologies. Using multiple tracers provides independent confirmation of flaw location, helps to clearly define transport pathways, and can be used for confirmatory testing (e.g., repeat the test using a new tracer). The PFT tests provide a direct measure of flaws …
Date:
March 11, 2002
Creator:
Heiser, J. & Sullivan, T.
Object Type:
Report
System:
The UNT Digital Library