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ALPHA SPECTROMETRIC EVALUATION OF SRM-995 AS A POTENTIAL URANIUM/THORIUM DOUBLE TRACER SYSTEM FOR AGE-DATING URANIUM MATERIALS
Uranium-233 (t{sub 1/2} {approx} 1.59E5 years) is an artificial, fissile isotope of uranium that has significant importance in nuclear forensics. The isotope provides a unique signature in determining the origin and provenance of uranium-bearing materials and is valuable as a mass spectrometric tracer. Alpha spectrometry was employed in the critical evaluation of a {sup 233}U standard reference material (SRM-995) as a dual tracer system based on the in-growth of {sup 229}Th (t{sub 1/2} {approx} 7.34E3 years) for {approx}35 years following radiochemical purification. Preliminary investigations focused on the isotopic analysis of standards and unmodified fractions of SRM-995; all samples were separated and purified using a multi-column anion-exchange scheme. The {sup 229}Th/{sup 233}U atom ratio for SRM-995 was found to be 1.598E-4 ({+-} 4.50%) using recovery-corrected radiochemical methods. Using the Bateman equations and relevant half-lives, this ratio reflects a material that was purified {approx} 36.8 years prior to this analysis. The calculated age is discussed in contrast with both the date of certification and the recorded date of last purification.
Date:
December 6, 2011
Creator:
Beals, D.
Object Type:
Article
System:
The UNT Digital Library
The Altus Times (Altus, Okla.), Vol. 112, No. 171, Ed. 1 Tuesday, December 6, 2011
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 6, 2011
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Baytown Sun (Baytown, Tex.), Vol. 91, No. 239, Ed. 1 Tuesday, December 6, 2011
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
December 6, 2011
Creator:
Gray, Janie
Object Type:
Newspaper
System:
The Portal to Texas History
The Boerne Star (Boerne, Tex.), Vol. 105, No. 97, Ed. 1 Tuesday, December 6, 2011
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
December 6, 2011
Creator:
Cartwright, Brian
Object Type:
Newspaper
System:
The Portal to Texas History
Coast Guard: Continued Improvements Needed to Address Potential Barriers to Equal Employment Opportunity
A letter report issued by the Government Accountability Office with an abstract that begins "The USCG is making progress toward becoming a model equal employment opportunity (EEO) program, as defined by EEOC. In fiscal year 2008, the USCG established a cross-functional task force, including many divisions of Coast Guard and co-led by the Civil Rights Director and the Assistant Commandant for Human Resources, to identify EEO problems, review data, as well as develop and implement plans to address barriers to EEO. EEOC officials commended the USCG's cross-functional approach, noting that it could strengthen the USCG's ability to bring together different divisions of the USCG toward a common goal of identifying and eliminating barriers to EEO. According to EEOC, progress has been most noticeable with the commitment of USCG's leadership to equality for all employees and applicants and its focus on resolving complaints in a quick and cost effective manner. However, EEOC noted that USCG could improve the way it conducts analyses of its barriers to equal employment. To attract and retain top talent, EEOC's MD-715 states that federal agencies are to identify barriers to EEO in the workplace, execute plans to eliminate barriers, and report annually to EEOC. USCG has …
Date:
December 6, 2011
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Development and testing of improved statistical wind power forecasting methods.
Wind power forecasting (WPF) provides important inputs to power system operators and electricity market participants. It is therefore not surprising that WPF has attracted increasing interest within the electric power industry. In this report, we document our research on improving statistical WPF algorithms for point, uncertainty, and ramp forecasting. Below, we provide a brief introduction to the research presented in the following chapters. For a detailed overview of the state-of-the-art in wind power forecasting, we refer to [1]. Our related work on the application of WPF in operational decisions is documented in [2]. Point forecasts of wind power are highly dependent on the training criteria used in the statistical algorithms that are used to convert weather forecasts and observational data to a power forecast. In Chapter 2, we explore the application of information theoretic learning (ITL) as opposed to the classical minimum square error (MSE) criterion for point forecasting. In contrast to the MSE criterion, ITL criteria do not assume a Gaussian distribution of the forecasting errors. We investigate to what extent ITL criteria yield better results. In addition, we analyze time-adaptive training algorithms and how they enable WPF algorithms to cope with non-stationary data and, thus, to adapt to …
Date:
December 6, 2011
Creator:
Mendes, J.; Bessa, R.J.; Keko, H.; Sumaili, J.; Miranda, V.; Ferreira, C. et al.
Object Type:
Report
System:
The UNT Digital Library
[Email from Carl Parker to Jack and George, Mike Anglin, Buddy Mullino, Rob Emery, December 6, 2011]
Email from Carl Parker to Jack and George, Mike Anglin, Buddy Mullino, and Rob Emery discussing an upcoming Dallas Way board meeting.
Date:
December 6, 2011
Creator:
Parker, Carl
Object Type:
Letter
System:
The UNT Digital Library
[Email from Rob Emery to Carl Parker, December 6, 2011]
Email from Rob Emery to Carl Parker discussing the future meeting for the Dallas Way.
Date:
December 6, 2011
Creator:
Parker, Carl
Object Type:
Letter
System:
The UNT Digital Library
An explicitly coupled hydro-geomechanical model for simulating hydraulic fracturing in complex discrete fracture networks
None
Date:
December 6, 2011
Creator:
Fu, P.; Johnson, S. M. & Carrigan, C. R.
Object Type:
Article
System:
The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Tuesday, December 6, 2011
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 6, 2011
Creator:
DeSilver, Debi
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Final Report: Development of a Thermal and Water Management System for PEM Fuel Cell
This final program report is prepared to provide the status of program activities performed over the period of 9 years to develop a thermal and water management (TWM) system for an 80-kW PEM fuel cell power system. The technical information and data collected during this period are presented in chronological order by each calendar year. Balance of plant (BOP) components of a PEM fuel cell automotive system represents a significant portion of total cost based on the 2008 study by TIAX LLC, Cambridge, MA. The objectives of this TWM program were two-fold. The first objective was to develop an advanced cooling system (efficient radiator) to meet the fuel cell cooling requirements. The heat generated by the fuel cell stack is a low-quality heat (small difference between fuel cell stack operating temperature and ambient air temperature) that needs to be dissipated to the ambient air. To minimize size, weight, and cost of the radiator, advanced fin configurations were evaluated. The second objective was to evaluate air humidification systems which can meet the fuel cell stack inlet air humidity requirements. The moisture from the fuel cell outlet air is transferred to inlet air, thus eliminating the need for an outside water source. …
Date:
December 6, 2011
Creator:
Zia Mirza, Program Manager
Object Type:
Report
System:
The UNT Digital Library
Final Report for Award DE-FG02-06ER64291
The original goal of this award was to develop a proteoglycan 'chip' containing suitable oligosaccharides that could be used as substrates for glycosyltransferases involved in synthesis or proteoglycans in higher plant cell walls. We had previously developed a suite of cloned enzymes that could be used to cleave most of the relevant glycosidic linkages in plant cell walls. The next step, supported by the previous award and this award, was to produce a series of transgenic plants in which synthetic proteins were introduced that contained each of the known sequence motifs that induce prolyl hydroxylation, and subsequent glycosylation. This work was completed and published in Estevez et al (2006). We then engaged on a series of experiments to define the properties of the prolyl hydroxylases that convert certain prolyl resides to hydroxyproline for subsequent glycosylation. This proved to be a challenging goal that required recruitment of an international team of complementary skills and several additional years of research. However, the effort was successful and has been published in Science recently (Velasquez et al., 2011). In the course of this project, the postdoc supported by the award (Jose Estevez) was asked to provide technical assistance to a colleague at Stanford because …
Date:
December 6, 2011
Creator:
Somerville, Chris
Object Type:
Report
System:
The UNT Digital Library
Fishery, Aquaculture, and Marine Mammal Issues in the 112th Congress
This report provides the information related to the fishery, aquaculture, and marine mammal issues in the 112th Congress
Date:
December 6, 2011
Creator:
Buck, Eugene H. & Upton, Harold F.
Object Type:
Report
System:
The UNT Digital Library
[Funeral Program for Jasper McGruder, December 6, 2011]
Funeral program for Jasper McGruder, born January 2, 1914 and died November 23, 2011. The funeral was held December 6, 2011 at D.W. Brooks Chapel, officiated by Rev. Kevin Nelson. Funeral arrangements were made through D.W. Brooks Funeral Home and he was buried in Fort Sam Houston National Cemetery near San Antonio, Texas.
Date:
December 6, 2011
Creator:
unknown
Object Type:
Pamphlet
System:
The Portal to Texas History
The Greensheet (Houston, Tex.), Vol. 42, No. 529, Ed. 1 Tuesday, December 6, 2011
Free weekly newspaper that includes business and classified advertising.
Date:
December 6, 2011
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Houston, Tex.), Vol. 42, No. 530, Ed. 1 Tuesday, December 6, 2011
Free weekly newspaper that includes business and classified advertising.
Date:
December 6, 2011
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Holidaily 2011
Holiday supplement to the North Texas Daily, a daily student newspaper from the University of North Texas in Denton, Texas that includes local, state and campus news along with advertising.
Date:
December 6, 2011
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Iraq: Politics, Governance, and Human Rights
This Congressional Research Service Report for Congress details political transitions, elections, and related governance issues pertaining to Iraq.
Date:
December 6, 2011
Creator:
Katzman, Kenneth
Object Type:
Report
System:
The UNT Digital Library
Jacksboro Gazette-News (Jacksboro, Tex.), Vol. 132, No. 26, Ed. 1 Tuesday, December 6, 2011
Weekly newspaper from Jacksboro, Texas that includes local, state and national news along with advertising.
Date:
December 6, 2011
Creator:
Hudson, Pam
Object Type:
Newspaper
System:
The Portal to Texas History
Marketing to Your Community: Becoming a Destination
Article on marketing your library collection to your community and becoming a destination for information.
Date:
December 6, 2011
Creator:
Sears, Suzanne
Object Type:
Article
System:
The UNT Digital Library
Numerical Limits on Employment-Based Immigration: Analysis of the Per-Country Ceilings
The report opens with brief explanations of the employment-based preference categories and the per-country ceilings governing annual admissions of LPRs. The focus is on the major employment-based preference categories. The report continues with a statistical analysis of the pending caseload of approved employment-based LPR petitions.
Date:
December 6, 2011
Creator:
Wasem, Ruth Ellen
Object Type:
Report
System:
The UNT Digital Library
The Oklahoma Daily (Norman, Okla.), Vol. 97, No. 75, Ed. 1 Tuesday, December 6, 2011
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
December 6, 2011
Creator:
Lusk, Chris
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Optically Detected Magnetic Resonance Studies on π-conjugated semiconductor systems
Optically Detected Magnetic Resonance (ODMR) techniques were used to investigate the dynamics of excitons and charge carriers in π-conjugated organic semiconductors. Degradation behavior of the negative spin-1/2 electroluminescence-detected magnetic resonance (ELDMR) was observed in Alq3 devices. The increase in the resonance amplitude implies an increasing bipolaron formation during degradation, which might be the result of growth of charge traps in the device. The same behavior of the negative spin-1/2 ELDMR was observed in 2wt% Rubrene doped Tris(8-hydroxyquinolinato)aluminium (Alq3) devices. However, with increasing injection current, a positive spin-1/2 ELDMR, together with positive spin 1 triplet powder patterns at {delta}m{sub S}={+-}1 and {delta}m{sub S}={+-}2, emerges. Due to the similarities in the frequency dependences of single and double modulated ELDMR and the photoluminescence-detected magnetic resonance (PLDMR) results in poly[2-methoxy-5-(2 -ethyl-hexyloxy)-1,4-phenyl ene vinylene] (MEH-PPV) films, the mechanism for this positive spin-1/2 ELDMR was assigned to enhanced triplet-polaron quenching under resonance conditions. The ELDMR in rubrene doped Alq3 devices provides a path to investigate charge distribution in the device under operational conditions. Combining the results of several devices with different carrier blocking properties and the results from transient EL, it was concluded trions not only exist near buffer layer but also exist in the electron …
Date:
December 6, 2011
Creator:
Chen, Ying
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Perry Daily Journal (Perry, Okla.), Vol. 119, No. 238, Ed. 1 Tuesday, December 6, 2011
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 6, 2011
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History