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Ion Uptake Determination of Dendrochronologically-Dated Trees Using Neutron Activation Analysis
Uptake of metal ions by plan roots is a function of the type and concentration of metal in the soil, the nutrient biochemistry of the plant, and the immediate environment of the root. Uptake of gold (Au) is known to be sensitive to soil pH for many species. Soil acidification due to acid precipitation following volcanic eruptions can dramatically increase Au uptake by trees. Identification of high Au content in tree rings in dendrochronologically-dated, overlapping sequences of trees allows the identification of temporally-conscribed, volcanically-influenced periods of environmental change. Ion uptake, specifically determination of trace amounts of gold, was performed for dendrochronologically-dated tree samples utilizing Neutron Activation Analysis (NAA) technique. The concentration of gold was correlated with known enviironmental changes, e.g. volcanic activities, during historic periods.
Date:
March 30, 2009
Creator:
Unlu, Kenan; Kuniholm, P. I.; Schwarz, D. K. H.; Cetiner, N. O. & Chiment, J. J.
Object Type:
Report
System:
The UNT Digital Library
Looking for Darwin's footprints in the microbial world
As we observe the 200th anniversary of Charles Darwin's birthday, microbiologists interested in the application of Darwin's ideas to the microscopic world have a lot to celebrate: an emerging picture of the (mostly microbial) Tree of Life at ever-increasing resolution, an understanding of horizontal gene transfer as a driving force in the evolution of microbes, and thousands of complete genome sequences to help formulate and refine our theories. At the same time, quantitative models of the microevolutionary processes shaping microbial populations remain just out of reach, a point that is perhaps most dramatically illustrated by the lack of consensus on how (or even whether) to define bacterial species. We summarize progress and prospects in bacterial population genetics, with an emphasis on detecting the footprint of positive Darwinian selection in microbial genomes.
Date:
March 30, 2009
Creator:
Shapiro, B. Jesse; David, Lawrence A.; Friedman, Jonathan & Alm, Eric J.
Object Type:
Article
System:
The UNT Digital Library
Low Temperature Combustion with Thermo-Chemical Recuperation to Maximize In-Use Engine Efficiency
The key to overcome Low Temperature Combustion (LTC) load range limitations in reciprocating engines is based on proper control over the thermo-chemical properties of the in-cylinder charge. The studied alternative to achieve the required control of LTC is the use of two separate fuel streams to regulate timing and heat release at specific operational points, where the secondary fuel is a reformed product of the primary fuel in the tank. It is proposed in this report that the secondary fuel can be produced using exhaust heat and Thermo-Chemical Recuperation (TCR). TCR for reciprocating engines is a system that employs high efficiency recovery of sensible heat from engine exhaust gas and uses this energy to transform fuel composition. The recuperated sensible heat is returned to the engine as chemical energy. Chemical conversions are accomplished through catalytic and endothermic reactions in a specially designed reforming reactor. An equilibrium model developed by Gas Technology Institute (GTI) for heptane steam reforming was applied to estimate reformed fuel composition at different reforming temperatures. Laboratory results, at a steam/heptane mole ratio less than 2:1, confirm that low temperature reforming reactions, in the range of 550 K to 650 K, can produce 10-30% hydrogen (by volume, wet) …
Date:
March 30, 2009
Creator:
Clark, Nigel N.; Posada, Francisco; Bedick, Clinton; Pratapas, John; Kozlov, Aleksandr; Linck, Martin et al.
Object Type:
Report
System:
The UNT Digital Library
Master's Recital: 2009-03-30 - Rachel Kjar Brough, oboe
Access:
Use of this item is restricted to the UNT Community
Recital presented at the UNT College of Music Recital Hall in partial fulfillment of the Master of Music (MM) degree.
Date:
March 30, 2009
Creator:
Brough, Rachel Kjar
Object Type:
Sound
System:
The UNT Digital Library
Melt spreading code assessment, modifications, and application to the EPR core catcher design.
The Evolutionary Power Reactor (EPR) is under consideration by various utilities in the United States to provide base load electrical production, and as a result the design is undergoing a certification review by the U.S. Nuclear Regulatory Commission (NRC). The severe accident design philosophy for this reactor is based upon the fact that the projected power rating results in a narrow margin for in-vessel melt retention by external cooling of the reactor vessel. As a result, the design addresses ex-vessel core melt stabilization using a mitigation strategy that includes: (1) an external core melt retention system to temporarily hold core melt released from the vessel; (2) a layer of 'sacrificial' material that is admixed with the melt while in the core melt retention system; (3) a melt plug in the lower part of the retention system that, when failed, provides a pathway for the mixture to spread to a large core spreading chamber; and finally, (4) cooling and stabilization of the spread melt by controlled top and bottom flooding. The overall concept is illustrated in Figure 1.1. The melt spreading process relies heavily on inertial flow of a low-viscosity admixed melt to a segmented spreading chamber, and assumes that the …
Date:
March 30, 2009
Creator:
Farmer, M. T.
Object Type:
Report
System:
The UNT Digital Library
Next-to-Leading Order Calculation of the Single Transverse Spin Asymmetry in the Drell-Yan Process
We calculate the next-to-leading order perturbative QCD corrections to the transverse momentum weighted single transverse spin asymmetry in Drell-Yan lepton pair production in hadronic collisions. We identify the splitting function relevant for the scale evolution of the twist-three quark-gluon correlation function. We comment on the consequences of our results for phenomenology.
Date:
March 30, 2009
Creator:
Vogelsang, Werner & Yuan, Feng
Object Type:
Article
System:
The UNT Digital Library
North Korea's Nuclear Weapons Development and Diplomacy
This report provides background information on the nuclear negotiations over North Korea's nuclear weapons program. Since August 2003, negotiations over North Korea's nuclear weapons programs have involved six governments: the United States, North Korea, China, South Korea, Japan, and Russia.
Date:
March 30, 2009
Creator:
Niksch, Larry A.
Object Type:
Report
System:
The UNT Digital Library
Nuclear Engineering Enrollments and Degrees Survey, 2008 Data
The survey includes degrees granted between September 1, 2007, and August 31, 2008, and fall 2008 enrollments. Thirty-one academic programs reported having nuclear engineering programs during 2008, and data was provided by all thirty-one programs.
Date:
March 30, 2009
Creator:
Analysis and Evaluation, Science Education Programs
Object Type:
Report
System:
The UNT Digital Library
Observations on Faults and Associated Permeability Structures in Hydrogeologic Units at the Nevada Test Site
Observational data on Nevada Test Site (NTS) faults were gathered from a variety of sources, including surface and tunnel exposures, core samples, geophysical logs, and down-hole cameras. These data show that NTS fault characteristics and fault zone permeability structures are similar to those of faults studied in other regions. Faults at the NTS form complex and heterogeneous fault zones with flow properties that vary in both space and time. Flow property variability within fault zones can be broken down into four major components that allow for the development of a simplified, first approximation model of NTS fault zones. This conceptual model can be used as a general guide during development and evaluation of groundwater flow and contaminate transport models at the NTS.
Date:
March 30, 2009
Creator:
Prothro, Lance B.; Drellack, Sigmund L.; Haugstad, Dawn N.; Huckins-Gang, Heather E. & Townsend, Margaret J.
Object Type:
Report
System:
The UNT Digital Library
The Oklahoma Daily (Norman, Okla.), Vol. 94, No. 121, Ed. 1 Monday, March 30, 2009
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
March 30, 2009
Creator:
Simons, Meredith
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Pyramidal and Chiral Groupings of Gold Nanocrystals Assembled Using DNA Scaffolds
Nanostructures constructed from metal and semiconductor nanocrystals conjugated to, and organized by DNA are an emerging class of material with collective optical properties. We created discrete pyramids of DNA with gold nanocrystals at the tips. By taking small angle X-ray scattering (SAXS) measurments from solutions of these pyramids we confirmed that this pyramidal geometry creates structures which are more rigid in solution than linear DNA. We then took advantage of the tetrahedral symmetry to demonstrate construction of chiral nanostructures.
Date:
March 30, 2009
Creator:
Mastroianni, Alexander; Claridge, Shelley & Alivisatos, A. Paul
Object Type:
Article
System:
The UNT Digital Library
Quarkyonic Matter and the Revised Phase Diagram of QCD
At high baryon number density, it has been proposed that a new phase of QCD matter controlsthe physics. This matter is confining but can have densities much larger than 3QCD. Its existenceis argued from large Nc approximations, and model computations. It is approximately chirallysymmetric.
Date:
March 30, 2009
Creator:
McLerran, L.
Object Type:
Article
System:
The UNT Digital Library
Real-Time Gene Expression Profiling of Live Shewanella Oneidensis Cells
The overall objective of this proposal is to make real-time observations of gene expression in live Shewanella oneidensis cells with high sensitivity and high throughput. Gene expression, a central process to all life, is stochastic because most genes often exist in one or two copies per cell. Although the central dogma of molecular biology has been proven beyond doubt, due to insufficient sensitivity, stochastic protein production has not been visualized in real time in an individual cell at the single-molecule level. We report the first direct observation of single protein molecules as they are generated, one at a time in a single live E. coli cell, yielding quantitative information about gene expression [Science 2006; 311: 1600-1603]. We demonstrated a general strategy for live-cell single-molecule measurements: detection by localization. It is difficult to detect single fluorescence protein molecules inside cytoplasm - their fluorescence is spread by fast diffusion to the entire cell and overwhelmed by the strong autofluorescence. We achieved single-molecule sensitivity by immobilizing the fluorescence protein on the cell membrane, where the diffusion is much slowed. We learned that under the repressed condition protein molecules are produced in bursts, with each burst originating from a stochastically-transcribed single messenger RNA molecule, …
Date:
March 30, 2009
Creator:
Xie, Xiaoliang Sunney
Object Type:
Report
System:
The UNT Digital Library
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 94, No. 167, Ed. 1 Monday, March 30, 2009
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 30, 2009
Creator:
Shance, Brenda
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Solving large-scale sparse eigenvalue problems and linear systems of equations for accelerator modeling
The solutions of sparse eigenvalue problems and linear systems constitute one of the key computational kernels in the discretization of partial differential equations for the modeling of linear accelerators. The computational challenges faced by existing techniques for solving those sparse eigenvalue problems and linear systems call for continuing research to improve on the algorithms so that ever increasing problem size as required by the physics application can be tackled. Under the support of this award, the filter algorithm for solving large sparse eigenvalue problems was developed at Stanford to address the computational difficulties in the previous methods with the goal to enable accelerator simulations on then the world largest unclassified supercomputer at NERSC for this class of problems. Specifically, a new method, the Hemitian skew-Hemitian splitting method, was proposed and researched as an improved method for solving linear systems with non-Hermitian positive definite and semidefinite matrices.
Date:
March 30, 2009
Creator:
Golub, Gene & Ko, Kwok
Object Type:
Report
System:
The UNT Digital Library
State, Foreign Operations Appropriations: A Guide to Component Accounts
This report briefly discusses the State, Foreign Operations, and Related Programs appropriations legislation and then provides a short description of the various funding accounts as they appear in the Omnibus Appropriations Act, 2009 (P.L. 111-8).
Date:
March 30, 2009
Creator:
Tarnoff, Curt & Nakamura, Kennon H.
Object Type:
Report
System:
The UNT Digital Library
Stress- and Chemistry-Mediated Permeability Enhancement/Degradation in Stimulated Critically-Stressed Fractures
This work has investigated the interactions between stress and chemistry in controlling the evolution of permeability in stimulated fractured reservoirs through an integrated program of experimentation and modeling. Flow-through experiments on natural and artificial fractures in Coso diorite have examined the evolution of permeability under paths of mean and deviatoric stresses, including the role of dissolution and precipitation. Models accommodating these behaviors have examined the importance of incorporating the complex couplings between stress and chemistry in examining the evolution of permeability in EGS reservoirs. This document reports the findings of experiment [1,2] and analysis [3,4], in four sequential chapters.
Date:
March 30, 2009
Creator:
Elsworth, Derek; Grader, Abraham S.; Marone, Chris; Halleck, Phillip; Rose, Peter; Faoro, Igor et al.
Object Type:
Report
System:
The UNT Digital Library
Subtask 7.1 - Strategic Studies
The Energy & Environmental Research Center (EERC) has recently completed 11 years of research through the Cooperative Agreement with the U.S. Department of Energy (DOE) National Energy Technology Laboratory (NETL) focused on fossil energy technology development and demonstration. To support a significant number of the different activities being considered within all of our research contracts with NETL, a subtask (7.1 Strategic Studies) was created to focus on small research efforts that came up throughout the year which would support an existing EERC-NETL project or would help to develop a new concept for inclusion in future efforts. Typical efforts conducted under this task were usually between $15,000 and $60,000 in scope and had time lines of less than 6 months. A limited number of larger studies were also conducted, generally at the direct request of NETL. Over the life of this task, 46 projects were conducted. These efforts ranged from quick experiments to gain fundamental knowledge to support a current effort, to literature reviews, to a few larger engineering efforts.
Date:
March 30, 2009
Creator:
Erickson, Thomas
Object Type:
Report
System:
The UNT Digital Library
Sweetwater Reporter (Sweetwater, Tex.), Vol. 111, No. 114, Ed. 1 Monday, March 30, 2009
Daily newspaper from Sweetwater, Texas that includes local, state, and national news along with advertising.
Date:
March 30, 2009
Creator:
Rodriguez, Tatiana
Object Type:
Newspaper
System:
The Portal to Texas History
The U.N. Population Fund: Background and the U.S. Funding Debate
None
Date:
March 30, 2009
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Water Quality Trends in the Entiat River Subbasin: Final 2008 Annual Report.
The ISEMP program monitors the status and trend of water quality elements that may affect restoration project effectiveness in the Entiat subbasin. As part of this effort, the PNW Research Station (PNW) measures, analyzes and interprets temporal trends in natural stream water pH, dissolved oxygen, specific conductivity and temperature. The Entiat River is currently on the Clean Water Act 303(d) list for pH exceedence, and there is insufficient information to determine the spatial and temporal extent or potential causes of this exceedence. In the spring 2008, PNW redeployed data-logging, multiparameter probes at four locations in the Entiat subbasin to measure water quality parameters, focusing on pH. This resumed previous data collection that was interrupted by river ice in early December 2007. Instruments were again removed from the river in early December 2008. This annual report covers the period from December 2007 through December 2008. The highest pH values occurred during the low-flow period from midsummer through the following midspring then dropped sharply during the annual snowmelt runoff period from late spring through early summer. Water temperature began rapidly increasing during the receding limb of the annual snowmelt hydrograph. Highest mean monthly temperatures occurred in July and August, while instantaneous maxima …
Date:
March 30, 2009
Creator:
Woodsmith, Richard & Bookter, Andy
Object Type:
Report
System:
The UNT Digital Library
The Altus Times (Altus, Okla.), Vol. 111, No. 188, Ed. 1 Sunday, March 29, 2009
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 29, 2009
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Baytown Sun (Baytown, Tex.), Vol. 89, No. 86, Ed. 1 Sunday, March 29, 2009
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
March 29, 2009
Creator:
Clements, Clifford E.
Object Type:
Newspaper
System:
The Portal to Texas History
Doctoral Recital: 2009-03-29 - Stephen Beall, viola
Recital presented at the UNT College of Music Concert Hall in partial fulfillment of the Doctor of Musical Arts (DMA) degree.
Date:
March 29, 2009
Creator:
Beall, Stephen
Object Type:
Sound
System:
The UNT Digital Library