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Producing High Energy ns Pump Beams for Raman Amplification of Short Pulses using SBS Beam Combination
None
Date:
July 4, 2013
Creator:
Kirkwood, R K; London, R A; Michel, P; Turnbull, D; Moody, J; Divol, L et al.
System:
The UNT Digital Library
Photoreduction of {sup 99}Tc Pertechnetate by Nanometer-Sized Metal Oxides: New Strategies for Formation and Sequestration of Low-Valent Technetium
Technetium-99 ({sup 99}Tc) ({beta}{sup -}{sub max}: 293.7 keV; t{sub 1/2}: 2.1 x 10{sup 5} years) is a byproduct of uranium-235 fission and comprises a large component of radioactive waste. Under aerobic conditions and in a neutral- basic environment, the pertechnetate anion (TcO{sub 4}{sup -}) is stable. TcO{sub 4}{sup -} is very soluble, migrates easily through the environment and does not sorb well onto mineral surfaces, soils or sediments. This study moves forward a new strategy for the reduction of TcO4- and chemical incorporation of the reduced Tc into a metal oxide material. This strategy employs a single material, a polyoxometalate (POM), {alpha}{sub 2}-[P{sub 2}W{sub 17}O{sub 61}]{sup 10-}, that can be photoactivated in the presence of 2-propanol to transfer electrons to TcO{sub 4}{sup -}, and incorporate the reduced Tc covalently into the {alpha}2- framework to form the Tc{sup V}O species, Tc{sup V}O({alpha}{sub 2}-P{sub 2}W{sub 17}O{sub 61}){sup 7-}. This occurs via the formation of an intermediate species that slowly converts to Tc{sup V}O({alpha}{sub 2}-P{sub 2}W{sub 17}O{sub 61}){sup 7-}. EXAFS and XANES analysis and preliminary EPR analysis, suggests that the intermediate consists of a Tc(IV) {alpha}2- species where the Tc is likely bound to only 2 of the 4 W-O oxygen atoms in …
Date:
July 4, 2011
Creator:
Burton-Pye, Benjamin P.; Radivojevic, Ivana; McGregor, Donna; Mbomekalle, Israel M.; Lukens, Jr., Wayne W. & Francesconi, Lynn C.
System:
The UNT Digital Library
Toward an Empirically-based Parametric Explosion Spectral Model
None
Date:
July 4, 2010
Creator:
Ford, S R; Walter, W R; Ruppert, S; Matzel, E; Hauk, T & Gok, R
System:
The UNT Digital Library
Reinforcement of Polylactic Acid for Fused Deposition Modeling Process with Nano Particles Treated Bamboo Powder
This article looks at the tensile properties and dynamic mechanical properties of bamboo powder (BP) reinforced polylactic acid (PLA) composite filaments which were treated with nano calcium carbonate (CaCO3), cellulose nanofibers (CNF), and micro-crystalline cellulose (MCC) using impregnation modification technology.
Date:
July 4, 2019
Creator:
Wang, Cuicui; Smith, Lee M.; Zhang, Wenfu; Li, Mingpeng; Wang, Ge; Shi, Sheldon et al.
System:
The UNT Digital Library
Estimating Individual Tree Height and Diameter at Breast Height (DBH) from Terrestrial Laser Scanning (TLS) Data at Plot Level
This article explores the methods of using terrestrial laser scanning (TLS) technology to obtain point cloud data and estimate individual tree height and diameter at breast height (DBH) at plot level in regions with complex terrain.
Date:
July 4, 2018
Creator:
Liu, Guangjie; Wang, Jinliang; Dong, Pinliang; Chen, Yun & Liu, Zhiyuan
System:
The UNT Digital Library
Heart Performance Determination by Visualization in Larval Fishes: Influence of Alternative Models for Heart Shape and Volume
This article assesses the validity of three different heart models applied to digital images of complete cardiac cycles in larval mahi-mahi and red drum.
Date:
July 4, 2017
Creator:
Perrichon, Prescilla; Grosell, Martin & Burggren, Warren W.
System:
The UNT Digital Library
Assessing Statistical Anxiety Among Online and Traditional Students
Article describes study which sought to determine whether scores on the Statistical Anxiety Scale (SAS) manifest in the same way for students in online and traditional statistics courses.
Date:
July 4, 2019
Creator:
Frey-Clark, Marta; Natesan, Prathiba & O’Bryant, Monique
System:
The UNT Digital Library
New molecular architectures containing low-valent cluster centres with di- and trimetalated 2-vinylpyrazine ligands: synthesis and molecular structures of Ru5(CO)15(μ5-C4H2N2CH[double bond, length as m-dash]CH)(μ-H)2 and Ru8(CO)24(μ7-C4H2N2CH[double bond, length as m-dash]C)(μ-H)3
Article details the reaction of Ru3(CO)12 with 2-vinylpyrazine, the aim of which was to synthesize clusters in which all of the donor atoms of the 2-vinylpyrazine ligand participate in bonding to the cluster core.
Date:
July 4, 2019
Creator:
Hossain, Md. Monir; Akter, Nahid; Ghosh, Shishir; Nesterov, Vladimir N.; Richmond, Michael G.; Hogarth, Graeme et al.
System:
The UNT Digital Library