Alan Dozier - Profile on Academia.edu (original) (raw)

Papers by Alan Dozier

White lines at K edges of light atoms

Physical review. B, Condensed matter, Jan 15, 1985

Al, Si, and Mg in various solids have broad, prominent peaks at the thresholds of their K-shell i... more Al, Si, and Mg in various solids have broad, prominent peaks at the thresholds of their K-shell ionization spectra. X-ray and electron-energy-loss data are in good agreement. Present theories of atoms and of solids, including some many-electron theories, do not explain these features.

Catalysis Letters, 2009

The mobility of surface-bound metallic nanoparticles (NPs) on catalyst supports results in agglom... more The mobility of surface-bound metallic nanoparticles (NPs) on catalyst supports results in agglomeration leading to a subsequent decrease in effectiveness of the catalytic behavior of the metal NPs over time. We report here the synthesis and characterization of a carbon nanotube (CNT) catalyst support system enhanced with 'docking stations' along the exterior which limit the surface mobility of ultra small iron catalyst particles on CNT surfaces during Fisher-Tropsch synthesis.

Graphitic nano- and micro-fibers, tubes and balloon-like structures grown from sawdust

Carbon, 2003

European Journal of Inorganic Chemistry, 2006

Thermally stable robust mesoporous nanocrystalline mixed cobalt-nickel spinel phases displaying u... more Thermally stable robust mesoporous nanocrystalline mixed cobalt-nickel spinel phases displaying unimodal pores in the 7-12 nm range and relatively high specific surface areas up to 83 m 2 /g were prepared by a novel low temperature synthesis approach in which the desired metal oxide stoichiometries were introduced on a molecular level by reacting heterometallic alkoxide precursors in the presence of supramolecular liquid crystalline phases. The resultant mesophases, composed mainly of ~8-11 nm cobalt-nickel spinel nanoparticles were highly promising as low temperature hydrocarbon combustion catalysts investigated in a model reaction of propane oxidation.

Topics in Catalysis, 2008

In the present study we systematically explored hydrothermal synthesis of bulk mixed metal Mo-V-(... more In the present study we systematically explored hydrothermal synthesis of bulk mixed metal Mo-V-(Te-Nb)-O catalysts and investigated the bulk characteristics of the resulting M1 and M2 phases as well as their roles in the selective ammoxidation of propane. It was found that unlike Mo-V-Te-Nb-O M1 phases, the Mo-V-Te-O M1 phases may be quantitatively transformed into M2 phases of the same chemical composition indicating that Nb stabilizes the M1 structure. The stabilizing role of Nb and Te was further observed in high resolution TEM studies of Mo-V-(Te-Nb)-O catalysts which indicated that structural order and the M1 phase domain size progressively decreased in this order: Mo-V-Te-Nb-O [ Mo-V-Te-O [ Mo-V-O. The cooperation between the M1 and M2 phases in propane ammoxidation to acrylonitrile was observed only at low propane conversions suggesting that the M1 phase is the only crystalline phase required for the activity and selectivity of the Mo-V-Te-Nb-O catalysts in propane ammoxidation to acrylonitrile at practical propane conversions.

Self-Assembly of Mesoporous Nanocrystalline Mixed Metal Oxides from Heterometallic Alkoxide Precursors: Cobalt-Nickel Oxide Spinels

Isothermal aging–microstructure–property relationship of SmCo 2:17 magnets

Materials Science and Technology, 2006

Chemistry-a European Journal, 2004

The time-dependent, local-density-approximation method of computing photoabsorption cross section... more The time-dependent, local-density-approximation method of computing photoabsorption cross sections has been modified to compute finite-wavelength spectra. Electron -energy-loss spectra at a variety of momentum transfers have been obtained in the region of the 4d excitation in tellurium. This region of the spectrum exhibits strong collective effects. Comparison of the results of the calculation with the experimental results reveals a discrepancy in the energy of the 4d excitation at large momentum transfer (short wavelength). Comparison of the results of the calculation with other experimental work on the noble gases reveals other discrepancies and allows the identification of higher order multipole excitations.

Microcirculation, 1999

Objective: Filamentous actin (F-actin) plays a central role in maintaining endothelial barrier fu... more Objective: Filamentous actin (F-actin) plays a central role in maintaining endothelial barrier function. Thrombin and histamine, two inflammatory mediators that increase endothelial permeability, can alter F-actin production and distribution. In this study, we use a newly developed image analysis technique to show that these two inflammatory mediators differentially alter F-actin structure. Methods: Human umbilical vein endothelial cells were grown to confluence and treated with either histamine (1 M), thrombin (1 M) or the agonist's vehicle. The endothelium was stained with BODIPY-phallodin, and digitized images were taken of the treated cells. The digitized images of individual human umbilical vein endothelial cells (HUVEC) were imported into a F-actin image analysis program (FAAP) and converted to layers, each one-pixel thick. The program then determined the mean gray level (which corresponded to the amount of F-actin) in each layer starting from the outside of the cell (layer 1) and progressing in one pixel layer increments towards the center of the cell (layer 32). Results: Both inflammatory mediators increased endothelial F-actin production, however, the distribution of the actin was different. Thrombin increased the presence of stress fibers, while also decreasing peripheral banding actin. In contrast, histamine had no effect on peripheral actin compared to control, but did increase the presence of F-actin stress fibers. Conclusions: These results establish that thrombin and histamine alter endothelial F-actin production in different locations within the cell, which can be quantified using an image analysis program.

Calculation of the elastic scattering of pions from light nuclei at 450 MeV

Physical Review C, 1981

A calculation is made of the elastic scattering of pions from ⁴He and ¹⁶O at an energy of 45... more A calculation is made of the elastic scattering of pions from ⁴He and ¹⁶O at an energy of 450 MeV. A single scattering optical potential is used with nuclear and nucleon form factors as determined elsewhere and the ..pi..N scattering amplitude expressed in terms of phase parameters. It is found that several of the N phase parameter sets can be

Elastic scattering of pions from ⁴He and ¹⁶O near 1 GeV

Physical Review C, 1981

The elastic scattering of pions from ⁴He and ¹⁶O is analyzed with a single-scattering optica... more The elastic scattering of pions from ⁴He and ¹⁶O is analyzed with a single-scattering optical potential, which is used in the solution of a relativistic integral scattering equation. Good agreement is obtained with available data near 1 GeV and choices are made for the nuclear and nucleon charge form factors and among the phase parameter sets at this energy.

“Crack Pattern Formation in Thin Film Lithium-Ion Battery Electrodes”, Juchuan Li, Alan K. Dozier, Yunchao Li, Fuqian Yang, Yang-Tse Cheng, J. Electrochemical Society, 158 (6) A689-A694 (2011).

“Carbon Nanotube Docking Stations: A New Concept in Catalysis”, U.M. Graham, A. Dozier, R.A. Khatri, M.C. Bahome, L.L. Jewell, S.D. Mhlanga, N.J. Coville, B.H. Davis, Catalysis Letters, , 2009, Vol. 129 No. 1-2, p. 39-45.

“The Scanning Electron Microscope as a Tool in Failure Analysis And Accident Reconstruction”, A. Johnson and A. Dozier, Proceedings of the International Centennial Conference on the Electron, University of Cambridge, UK, (1999)

"Angle-Resolved Measurements of an Atomic, Giant-Dipole Resonance", A. K. Dozier, and P. C. Gibbons, Physical Review A, 39, 3336 (1989)

"White Lines at K-Edges of Light Atoms", C. R. Bradley, M. L. Wroge, A. K. Dozier, and P. C. Gibbons, Physical Review B, 31, 5066 (1985)

"Dispersion of an Atomic Giant-Dipole Resonance", A. K. Dozier, and P. C. Gibbons, Physical Review A 32, 1981 (1985)

"Calculation of the Elastic Scattering of Pions from Light Nuclei at 450 MeV", A. K. Dozier, and J. S. Chalmers, Physical Review C, 23, 563 (1981)

White lines at K edges of light atoms

Physical review. B, Condensed matter, Jan 15, 1985

Al, Si, and Mg in various solids have broad, prominent peaks at the thresholds of their K-shell i... more Al, Si, and Mg in various solids have broad, prominent peaks at the thresholds of their K-shell ionization spectra. X-ray and electron-energy-loss data are in good agreement. Present theories of atoms and of solids, including some many-electron theories, do not explain these features.

Catalysis Letters, 2009

The mobility of surface-bound metallic nanoparticles (NPs) on catalyst supports results in agglom... more The mobility of surface-bound metallic nanoparticles (NPs) on catalyst supports results in agglomeration leading to a subsequent decrease in effectiveness of the catalytic behavior of the metal NPs over time. We report here the synthesis and characterization of a carbon nanotube (CNT) catalyst support system enhanced with 'docking stations' along the exterior which limit the surface mobility of ultra small iron catalyst particles on CNT surfaces during Fisher-Tropsch synthesis.

Graphitic nano- and micro-fibers, tubes and balloon-like structures grown from sawdust

Carbon, 2003

European Journal of Inorganic Chemistry, 2006

Thermally stable robust mesoporous nanocrystalline mixed cobalt-nickel spinel phases displaying u... more Thermally stable robust mesoporous nanocrystalline mixed cobalt-nickel spinel phases displaying unimodal pores in the 7-12 nm range and relatively high specific surface areas up to 83 m 2 /g were prepared by a novel low temperature synthesis approach in which the desired metal oxide stoichiometries were introduced on a molecular level by reacting heterometallic alkoxide precursors in the presence of supramolecular liquid crystalline phases. The resultant mesophases, composed mainly of ~8-11 nm cobalt-nickel spinel nanoparticles were highly promising as low temperature hydrocarbon combustion catalysts investigated in a model reaction of propane oxidation.

Topics in Catalysis, 2008

In the present study we systematically explored hydrothermal synthesis of bulk mixed metal Mo-V-(... more In the present study we systematically explored hydrothermal synthesis of bulk mixed metal Mo-V-(Te-Nb)-O catalysts and investigated the bulk characteristics of the resulting M1 and M2 phases as well as their roles in the selective ammoxidation of propane. It was found that unlike Mo-V-Te-Nb-O M1 phases, the Mo-V-Te-O M1 phases may be quantitatively transformed into M2 phases of the same chemical composition indicating that Nb stabilizes the M1 structure. The stabilizing role of Nb and Te was further observed in high resolution TEM studies of Mo-V-(Te-Nb)-O catalysts which indicated that structural order and the M1 phase domain size progressively decreased in this order: Mo-V-Te-Nb-O [ Mo-V-Te-O [ Mo-V-O. The cooperation between the M1 and M2 phases in propane ammoxidation to acrylonitrile was observed only at low propane conversions suggesting that the M1 phase is the only crystalline phase required for the activity and selectivity of the Mo-V-Te-Nb-O catalysts in propane ammoxidation to acrylonitrile at practical propane conversions.

Self-Assembly of Mesoporous Nanocrystalline Mixed Metal Oxides from Heterometallic Alkoxide Precursors: Cobalt-Nickel Oxide Spinels

Isothermal aging–microstructure–property relationship of SmCo 2:17 magnets

Materials Science and Technology, 2006

Chemistry-a European Journal, 2004

The time-dependent, local-density-approximation method of computing photoabsorption cross section... more The time-dependent, local-density-approximation method of computing photoabsorption cross sections has been modified to compute finite-wavelength spectra. Electron -energy-loss spectra at a variety of momentum transfers have been obtained in the region of the 4d excitation in tellurium. This region of the spectrum exhibits strong collective effects. Comparison of the results of the calculation with the experimental results reveals a discrepancy in the energy of the 4d excitation at large momentum transfer (short wavelength). Comparison of the results of the calculation with other experimental work on the noble gases reveals other discrepancies and allows the identification of higher order multipole excitations.

Microcirculation, 1999

Objective: Filamentous actin (F-actin) plays a central role in maintaining endothelial barrier fu... more Objective: Filamentous actin (F-actin) plays a central role in maintaining endothelial barrier function. Thrombin and histamine, two inflammatory mediators that increase endothelial permeability, can alter F-actin production and distribution. In this study, we use a newly developed image analysis technique to show that these two inflammatory mediators differentially alter F-actin structure. Methods: Human umbilical vein endothelial cells were grown to confluence and treated with either histamine (1 M), thrombin (1 M) or the agonist's vehicle. The endothelium was stained with BODIPY-phallodin, and digitized images were taken of the treated cells. The digitized images of individual human umbilical vein endothelial cells (HUVEC) were imported into a F-actin image analysis program (FAAP) and converted to layers, each one-pixel thick. The program then determined the mean gray level (which corresponded to the amount of F-actin) in each layer starting from the outside of the cell (layer 1) and progressing in one pixel layer increments towards the center of the cell (layer 32). Results: Both inflammatory mediators increased endothelial F-actin production, however, the distribution of the actin was different. Thrombin increased the presence of stress fibers, while also decreasing peripheral banding actin. In contrast, histamine had no effect on peripheral actin compared to control, but did increase the presence of F-actin stress fibers. Conclusions: These results establish that thrombin and histamine alter endothelial F-actin production in different locations within the cell, which can be quantified using an image analysis program.

Calculation of the elastic scattering of pions from light nuclei at 450 MeV

Physical Review C, 1981

A calculation is made of the elastic scattering of pions from ⁴He and ¹⁶O at an energy of 45... more A calculation is made of the elastic scattering of pions from ⁴He and ¹⁶O at an energy of 450 MeV. A single scattering optical potential is used with nuclear and nucleon form factors as determined elsewhere and the ..pi..N scattering amplitude expressed in terms of phase parameters. It is found that several of the N phase parameter sets can be

Elastic scattering of pions from ⁴He and ¹⁶O near 1 GeV

Physical Review C, 1981

The elastic scattering of pions from ⁴He and ¹⁶O is analyzed with a single-scattering optica... more The elastic scattering of pions from ⁴He and ¹⁶O is analyzed with a single-scattering optical potential, which is used in the solution of a relativistic integral scattering equation. Good agreement is obtained with available data near 1 GeV and choices are made for the nuclear and nucleon charge form factors and among the phase parameter sets at this energy.

“Crack Pattern Formation in Thin Film Lithium-Ion Battery Electrodes”, Juchuan Li, Alan K. Dozier, Yunchao Li, Fuqian Yang, Yang-Tse Cheng, J. Electrochemical Society, 158 (6) A689-A694 (2011).

“Carbon Nanotube Docking Stations: A New Concept in Catalysis”, U.M. Graham, A. Dozier, R.A. Khatri, M.C. Bahome, L.L. Jewell, S.D. Mhlanga, N.J. Coville, B.H. Davis, Catalysis Letters, , 2009, Vol. 129 No. 1-2, p. 39-45.

“The Scanning Electron Microscope as a Tool in Failure Analysis And Accident Reconstruction”, A. Johnson and A. Dozier, Proceedings of the International Centennial Conference on the Electron, University of Cambridge, UK, (1999)

"Angle-Resolved Measurements of an Atomic, Giant-Dipole Resonance", A. K. Dozier, and P. C. Gibbons, Physical Review A, 39, 3336 (1989)

"White Lines at K-Edges of Light Atoms", C. R. Bradley, M. L. Wroge, A. K. Dozier, and P. C. Gibbons, Physical Review B, 31, 5066 (1985)

"Dispersion of an Atomic Giant-Dipole Resonance", A. K. Dozier, and P. C. Gibbons, Physical Review A 32, 1981 (1985)

"Calculation of the Elastic Scattering of Pions from Light Nuclei at 450 MeV", A. K. Dozier, and J. S. Chalmers, Physical Review C, 23, 563 (1981)