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  Partner: UNT College of Arts and Sciences
 Decade: 1990-1999
 Collection: UNT Scholarly Works
Small Molecule Elimination from Group IVB (Ti, Zr, Hf) Amido Complexes
This article discusses small molecule elimination from group IVB (Ti, Zr, Hf) amido complexes. An ab initio quantum chemical analysis of HX (X = H, CH₃, Cl, NH₂, SiH₃) elimination by group IVB (Ti, Zr, Hf) amidos (H₂(X)M - NH₂ → H₂M = NH + HX), of interest in the context of CVD precursor design, is reported.
Simultaneous measurement of the average ion-induced electron emission yield and the mean charge for isotachic ions in carbon foils
This article discusses simultaneous measurement of the average ion-induced electron emission yield and the mean charge for isotachic ions in carbon foils. Knowledge of the incident ion's atomic number (Z₁) dependence of ion-induced electron emission yields can be the basis for a general understanding of ion-atom interaction phenomena and, in particular, for the design of Z₁-sensitive detectors that could be useful, for example, in the separation of isobars in accelerator mass spectrometry.
Dynamical approach to Lévy processes
This article discusses a dynamical approach to Lévy processes, which makes it possible to derive all statistical properties of the diffusion process from the correlation function of the dichotomous fluctuating variable Φy(t).
Fractional Brownian motion as a nonstationary process: An alternative paradigm for DNA sequences
This article discusses fractional Brownian motion as a nonstationary process. The model adopted is compatible with the known biological and physical constraints, namely, it is shown to be consistent with the information of current biological literature on folding as well as with the statistical analyses of DNA sequences.
Toxicological Case Study of Dallas' Central Wastewater Treatment Plant Effluent and Ambient Trinity River Samples: 1989, 1990, 1991
"This study was implemented voluntarily by personnel at Dallas Water Utilities in response to concerns that the Dallas Central Wastewater Treatment Plant was adversely affecting downstream water quality." The treatment plant was studied to determine whether it was "discharging toxic materials in toxic amounts to the Trinity River" (p. 1).
An Effective Core Potential Study of Transition-Metal Chalcogenides. 1. Molecular Structure
This article discusses an effective core potential study of transition-metal chalcogenides O, S, Se, and Te.
High-Valent Transition-Metal Alkylidene Complexes: Effect of Ligand and Substituent Modification
This article discusses the effects of ligand and substituent modification on the metal-carbon double bond. The main conclusion drawn from this work is that the intrinsic nature of the metal-carbon double bond can typically be changed only within certain limits by modification of the electronegativity of the ligands (L) and substituents (Z).
[Review] Chemistry of Advanced Materials: An Overview
This book review discusses 'Chemistry of Advanced Materials: An Overview', edited by Leonard V. Interrante from Renssalaer Polytechnic Institute, and Mark J. Hampden-Smith from the University of New Mexico.
[Review] Deciphering the Chemical Code: Bonding Across the Periodic Table
This book review discusses 'Deciphering the Chemical Code: Bonding Across the Periodic Table' by Nicolaos D. Epiotis from the University of Washington. The reviewer describes the work as a new theoretical framework for describing chemical bonding and gives specific information on what's covered in the book, the themes, and ideal audiences.
On the Constructibility with Ruler and Compass of a Minimum Chord in a Parabola
Article on the constructibility with ruler and compass of a minimum chord in a parabola. Abstract: In this note we give a constructive description of all the points inside a parabola admitting a minimum chord of fixed direction.
Bianucci, Mannella, and Grigolini Reply
This article is a reply to a comment by Massimo Falcioni and Angelo Vulpiani. In a previous letter, the authors have discussed the linear response theory (LRT) and shown that the breakdown of this theory occurring at intermediate times, observed in an earlier paper [2] as well as in [1], disappears upon an increase of the number of degrees of freedom. In a comment to [1] Falcioni and Vulpiani [3] claim that this breakdown is rather a consequence of the lack of mixing: according to them, regardless of the number of degrees of freedom, mixing is the key ingredient behind the LRT.
K-shell x-ray-production cross sections in 6C, 8O, 9F, 11Na, 12Mg, and 13Al, by 0.75- to 4.5-MeV protons
This article discusses K-shell x-ray-production cross sections. Abstract: K-shell x-ray-production cross sections are reported for elements with K-shell x-ray energies between 277 eV (C) and 1487 eV (Al). The x-ray measurements were made with a windowless Si(Li) detector that was calibrated for efficiency by comparing bremsstrahlung spectra from electron bombardment of thin foils of aluminum, silver, and gold with theoretically determined bremsstrahlung spectral distributions. The x-ray-production cross-section measurements are compared to first-order Born and perturbed-stationary-state with energy-loss, Coulomb deflection, and relativistic corrections (ECPSSR) ionization theories using single-hole fluorescence yields. The ECPSSR and first-order Born theoretical predictions are, in general, in close agreement with each other and both generally fit the data quite well.
Historic Archaeology of the Johnson and Jones Farmsteads in the Ray Roberts Lake Area: 1850-1950
This study represents the findings of research done on the Jones and Johnson farms, "situated in Johnson Branch Park in the north-central portion of the Ray Roberts Lake area." The purpose of the study was to offset future disturbances and damages to these farmsteads, and it includes "archival investigations, architectural documentation, oral-history interviews of long-time area residents and family members, farm equipment and artifact analyses, archaeological excavations, stabilization measures, and the development of interpretative exhibits for area schools, museums, and the general public" (p. i).
Fabrication of silicon-based optical components for an ultraclean accelerator mass spectronomy negative ion source
This article discusses an ultraclean accelerator mass spectronomy negative ion source for semiconductor material mass analysis that was built and is in operation at the University of North Texas' Ion Beam Modification and Analysis Laboratory (IBMAL).
SL₂-Polynomial Invariance
Article on SL₂-polynomial invariance. The purpose of this article is to describe completely, in a constructive way, the structure of these invariant polynomials in the particular case n = 2, for an arbitrary field k.
Modeling Nonlinear Optical Properties of Transition Metal Complexes. Basis Set, Effective Core Potential, and Geometry Effects
This article discusses modeling nonlinear optical properties of transition metal complexes.
Calculation of a Methane C-H Oxidative Addition Trajectory: Comparison to Experiment and Methane Activation by High-Valent Complexes
This article discusses the calculation of a methane C-H oxidative addition trajectory.
Principal Resonance Contributors to High-Valent, Transition-Metal Alkylidene Complexes
This article discusses principal resonance contributors to high-valent, transition-metal alkylidene complexes. Stationary points on each potential energy surface are characterized and compared to experimental information where available; as long as a suitably flexible valence basis set is used, good agreement between theoretically calculated and experimentally determined geometries is obtained.
Transition Metal Imido Complexes
This articles discusses transition metal imido complexes. A wide range of transition metal imido (TMI) complexes is studied using ab initio molecular orbital (MO) calculations. The main computational point of interest is the further testing of effective core potentials (ECPs) and valence basis sets to allow for the accurate calculation of properties for reasonably sized transition metal complexes.
Methane Activation by Group IVB Imido Complexes
This article discusses a study of methane activation by group IVB imido complexes, when coupled with available experimental data, reveals an interesting picture of this important reaction.
Dynamical model for DNA sequences
This article discusses a dynamical model for DNA sequences based on the assumption that the statistical properties of DNA paths are determined by the joint action of two processes, one deterministic with long-range correlations and the other random and δ-function correlated.
The Markov approximation revisited: inconsistency of the standard quantum Brownian motion model
Article discussing the Markov approximation. Abstract: We revisit the Markov approximation necessary to derive ordinary Brownian motion from a model widely adopted in literature for this specific purpose. We show that this leads to internal inconsistencies, thereby implying that further search for a more satisfactory model is required.
Quantum Irreversibility and Chaos [Phys. Rev. Lett. 67, 2593 (1991)]
Corrections to an equation printed with a typographical error in Quantum Irreversibility and Chaos, Physical Review Letters 67, 2593 (1991).
Utilization of Cyanide as a Nitrogenous Substrate by Pseudomonas fluorescens NCIMB 11764: Evidence for Multiple Pathways of Metabolic Conversion
Article on the utilization of cyanide as a nitrogenous substrate by Pseudomonas fluorescens NCIMB 11764 and evidence for multiple pathways of metabolic conversion.
Nucleotide Sequence of xylE from the TOL pDK1 Plasmid and Structural Comparison with Isofunctional Catechol-2,3-Dioxygenase Genes from TOL pWW0 and NAH7
Article on the nucleotide sequence of xylE from the TOL pDK1 plasmid and structural comparison with isofunctional catechol-2,3-dioxygenase genes from TOL pWW0 and NAH7.
Degradation of the Metal-Cyano Complex Tetracyanonickelate(II) by Cyanide-Utilizing Bacterial Isolates
Article on the degradation of the metal-cyano complex tetracyanonickelate(II) by cyanide-utilizing bacterial isolates.
Accumulation of α-Keto Acids as Essential Components in Cyanide Assimilation by Pseudomonas fluorescens NCIMB 11764
Article on the accumulation of α-Keto acids as essential components in cyanide assimilation by Pseudomonas fluorescens NCIMB 11764.
N-Acylethanolamines in Signal Transduction of Elicitor Perception. Attenuation of Alkalinization Response and Activation of Defense Gene Expression
Article on N-acylethanolamines in signal transduction of elicitor perception and the attenuation of alkalinization response and activation of defense gene expression.
N-Acylphosphatidylethanolamine in Dry and Imbibing Cottonseeds. Amounts, Molecular Species, and Enzymatic Synthesis
Article on N-acylphosphatidylethanolamine in dry and imbibing cottonseeds.
N-Acylethanolamines in Seeds. Quantification of Molecular Species and their Degradation upon Imbibition
Article on N-acylethanolamines in seeds and the quantification of molecular species and their degradation upon imbibition.
N-Acylethanolamines: Formation and Molecular Composition of a New Class of Plant Lipids
Article on N-acylethanolamines and the formation and molecular composition of a new class of plant lipids.
Comment on "Margules Equations Applied to PAH Solubilities in Alcohol-Water Mixtures"
This article provides comments on "Margules Equations Applied to PAH Solubilities in Alcohol-Water Mixtures," published in 'Environmental Science & Technology," 1997.
Estimating Solid-Liquid Phase Change Enthalpies and Entropies
This article discusses estimating solid-liquid phase change enthalpies and entropies.
Solubility of Anthracene in Ternary Dibutyl Ether + Alcohol + 2,2,4-Trimethylpentane Solvent Mixtures
Article on the solubility of anthracene in ternary dibutyl ether + alcohol + 2,2,4-trimethylpentane solvent mixtures.
An Abstract Index Theorem on Non-Compact Riemannian Manifolds
This article discusses an abstract index theorem on non-compact Riemannian manifolds.
Ad-dimers on Strained Carbon Nanotubes: A New Route for Quantum Dot Formation?
Article on ad-dimers on strained carbon nano-tubes.
Charge-state dependence of K-shell x-ray production in aluminum by 2-12-MeV carbon ions
This article discusses charge-state dependence of K-shell x-ray production in aluminum by 2-12-MeV carbon ions.
Chaos and thermal conductivity
This article discusses chaos and thermal conductivity.
Charge-state dependence of M-shell x-ray production in 67Ho by 2-12-MeV carbon ions
This article discusses charge-state dependence of M-shell x-ray production in 67Ho by 2-12-MeV carbon ions.
Design of highly specific cytotoxins by using trans-splicing ribozymes
This article discusses the design of highly specific cytotoxins by using trans-splicing ribozymes.
Direct evidence for the amorphous silicon phase in visible photoluminescent porous silicon
This article discusses direct evidence for the amorphous silicon phase in visible photoluminescent porous silicon.
Dynamic Approach to the Thermodynamics of Superdiffusion
This article discusses dynamic approach to the thermodynamics of superdiffusion.
Electronic transport in extended systems: Application to carbon nanotubes
Article on electronic transport in extended systems and the application to carbon nanotubes.
Experimental evidence for a discrete transition to channeling for 1.0-MeV protons in Si〈100〉
This article discusses experimental evidence for a discrete transition to channeling for 1.0-MeV protons in Si〈100〉.
Anomalous diffusion and ballistic peaks: A quantum perspective
This article discusses anomalous diffusion and ballistic peaks.
Anomalous diffusion and environment-induced quantum decoherence
This article discusses anomalous diffusion and environment-induced quantum decoherence.
Are Net Discount Ratios Stationary?: The Implications For Present Value Calculations
This article analyzes the relationship between real interest rates and real growth rates in wages.
Are Net Discount Rates Stationary?: Some Further Evidence
This article discusses net discount rates.
Brittle and Ductile Behavior in Carbon Nanotubes
Article on brittle and ductile behavior in carbon nanotubes.
Control of chaos in a CO2 laser
This article discusses the control of chaos in a CO2 laser.