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The Wynnewood Gazette (Wynnewood, Okla.), Vol. 106, No. 41, Ed. 1 Thursday, March 26, 2009
Weekly newspaper from Wynnewood, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 26, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
X-ray Emission Spectroscopy to Study Ligand Valence Orbitals in Mn Coordination Complexes
We discuss a spectroscopic method to determine the character of chemical bonding and for the identification of metal ligands in coordination and bioinorganic chemistry. It is based on the analysis of satellite lines in X-ray emission spectra that arise from transitions between valence orbitals and the metal ion 1s level (valence-to-core XES). The spectra, in connection with calculations based on density functional theory (DFT), provide information that is complementary to other spectroscopic techniques, in particular X-ray absorption (XANES and EXAFS). The spectral shape is sensitive to protonation of ligands and allows ligands, which differ only slightly in atomic number (e.g., C, N, O...), to be distinguished. A theoretical discussion of the main spectral features is presented in terms of molecular orbitals for a series of Mn model systems: [Mn(H2O)6]2+, [Mn(H2O)5OH]+, [Mn(H2O)5NH2]+, and [Mn(H2O)5NH3]2+. An application of the method, with comparison between theory and experiment, is presented for the solvated Mn2+ ion in water and three Mn coordination complexes, namely [LMn(acac)N3]BPh4, [LMn(B2O3Ph2)(ClO4)], and [LMn(acac)N]BPh4, where L represents 1,4,7-trimethyl-1,4,7-triazacyclononane, acac stands for the 2,4-pentanedionate anion, and B2O3Ph2 represents the 1,3-diphenyl-1,3-dibora-2-oxapropane-1,3-diolato dianion.
Date:
March 2, 2009
Creator:
Smolentsev, Grigory; Soldatov, Alexander V; Messinger, Johannes; Merz, Kathrin; Weyhermuller, Thomas; Bergmann, Uwe et al.
Object Type:
Article
System:
The UNT Digital Library
Year of Birth Determination Using Radiocarbon Dating of Dental Enamel
Radiocarbon dating is typically an archaeological tool rather than a forensic one. Recently however, we have shown that the amount of radiocarbon present in tooth enamel, as a result of nuclear bomb testing during the cold war, is a remarkably accurate indicator of when a person is born. Enamel isolated from human teeth is processed to form graphite and carbon-14 ({sup 14}C) levels are measured using accelerator mass spectrometry. Since there is no turnover of enamel after it is formed, {sup 14}C levels in the enamel represent {sup 14}C levels in the atmosphere at the time of its formation. In this paper we describe the strategy used to determine the date of birth of an individual based on radiocarbon levels in tooth enamel, focusing on the methodology of this strategy. Year of birth information can significantly assist police investigators when the identity of a deceased individual is unknown. In such cases police will try to match particulars of the unidentified individual (which is often only gender and/or an estimate of age), with particulars from missing persons lists.
Date:
March 10, 2009
Creator:
Buchholz, B. A. & Spalding, K. L.
Object Type:
Article
System:
The UNT Digital Library
Yoakum Herald-Times (Yoakum, Tex.), Vol. 117, No. 9, Ed. 1 Wednesday, March 4, 2009
Weekly newspaper from Yoakum, Texas that includes local, state, and national news along with advertising.
Date:
March 4, 2009
Creator:
McCracken, Michael S.
Object Type:
Newspaper
System:
The Portal to Texas History
Yoakum Herald-Times (Yoakum, Tex.), Vol. 117, No. 10, Ed. 1 Wednesday, March 11, 2009
Weekly newspaper from Yoakum, Texas that includes local, state, and national news along with advertising.
Date:
March 11, 2009
Creator:
McCracken, Michael S.
Object Type:
Newspaper
System:
The Portal to Texas History
Yoakum Herald-Times (Yoakum, Tex.), Vol. 117, No. 11, Ed. 1 Wednesday, March 18, 2009
Weekly newspaper from Yoakum, Texas that includes local, state, and national news along with advertising.
Date:
March 18, 2009
Creator:
McCracken, Michael S.
Object Type:
Newspaper
System:
The Portal to Texas History
Yoakum Herald-Times (Yoakum, Tex.), Vol. 117, No. 12, Ed. 1 Wednesday, March 25, 2009
Weekly newspaper from Yoakum, Texas that includes local, state, and national news along with advertising.
Date:
March 25, 2009
Creator:
McCracken, Michael S.
Object Type:
Newspaper
System:
The Portal to Texas History
[Youth orchestra and choir spring concert]
Video recording from The Black Academy of Arts and Letters recorded during the Dallas Independent School Districts Townview high school orchestra and choir concert held at the Academy in March of 2009. The footage shows the audience seated in folding chairs watching the students perform on a low stage at the front of the room.
Date:
March 2009
Creator:
King, Curtis
Object Type:
Video
System:
The UNT Digital Library
Z' Bosons, the NuTeV Anomaly, and the Higgs Boson Mass
Fits to the precision electroweak data that include the NuTeV measurement are considered in family universal, anomaly free U(1) extensions of the Standard Model. In data sets from which the hadronic asymmetries are excluded, some of the Z{prime} models can double the predicted value of the Higgs boson mass, from {approx} 60 to {approx} 120 GeV, removing the tension with the LEP II lower bound, while also modestly improving the {chi}{sup 2} confidence level. The effect of the Z{prime} models on both m{sub H} and the {chi}{sup 2} confidence level is increased when the NuTeV measurement is included in the fit. Both the original NuTeV data and a revised estimate by the PDG are considered.
Date:
March 3, 2009
Creator:
Chanowitz, Michael S
Object Type:
Article
System:
The UNT Digital Library
Zimbabwe: The Power Sharing Agreement and Implications for U.S. Policy
None
Date:
March 25, 2009
Creator:
Ploch, Lauren
Object Type:
Report
System:
The UNT Digital Library