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Articles 61 - 72 of 72
Full-Text Articles in Physical Sciences and Mathematics
Aims & Scope
Journal of Mathematics and Science: Collaborative Explorations
No abstract provided.
Journal Of Mathematics And Science: Collaborative Explorations
Journal Of Mathematics And Science: Collaborative Explorations
Journal of Mathematics and Science: Collaborative Explorations
No abstract provided.
Connecting Mathematics And The Applied Science Of Energy Conservation, R. E. Carbone, J. M. Pearce
Connecting Mathematics And The Applied Science Of Energy Conservation, R. E. Carbone, J. M. Pearce
Journal of Mathematics and Science: Collaborative Explorations
To effectively teach science in the elementary classroom, pre-service K-8 teachers need a basic understanding of the underlying concepts of physics, which demand a strong foundation in mathematics. Unfortunately, the depth of mathematics understanding of prospective elementary teachers has been a growing and serious concern for several decades. To overcome this challenge, a two-pronged attack was used in this study. First. students in mathematics courses were coupled with physical science courses by linking registration to ensure co-requisites were taken. This alone improved passing rates. Secondly, an energy conservation project was introduced in both classes that intimately tied the theoretical mathematics …
Magnetism In Assembled And Supported Silicon Endohedral Cages: First-Principles Electronic Structure Calculations, R. Robles, Shiv N. Khanna
Magnetism In Assembled And Supported Silicon Endohedral Cages: First-Principles Electronic Structure Calculations, R. Robles, Shiv N. Khanna
Physics Publications
First principles electronic structure calculations on a free CrSi12cluster, a (CrSi12)2 dimer, and CrSi12 clusters supported on Si(111) surfaces have been carried out within a gradient corrected density functional formalism using a supercell approach. The ground state of CrSi12 is a Cr centered hexagonal biprism of Si atoms in which the Cr spin moment is completely quenched. As two CrSi12 motifs are brought together, they form different composite units depending on initial direction of approach and, in most cases, the composite cluster is found to have a net spin moment. Cluster assemblies obtained by depositing CrSi12 motifs on a Si(111) …
Al13h−: Hydrogen Atom Site Selectivity And The Shell Model, A. Grubisic, X. Li, S. T. Stokes, K. Vetter, G. F. Ganteför, K. H. Bowen, P. Jena, B. Kiran, R. Burgert, H. Schnöckel
Al13h−: Hydrogen Atom Site Selectivity And The Shell Model, A. Grubisic, X. Li, S. T. Stokes, K. Vetter, G. F. Ganteför, K. H. Bowen, P. Jena, B. Kiran, R. Burgert, H. Schnöckel
Physics Publications
Using a combination of anion photoelectron spectroscopy and density functional theory calculations, we explored the influence of the shell model on H atom site selectivity in Al13H−. Photoelectron spectra revealed that Al13H− has two anionic isomers and for both of them provided vertical detachment energies (VDEs). Theoretical calculations found that the structures of these anionic isomers differ by the position of the hydrogen atom. In one, the hydrogen atom is radially bonded, while in the other, hydrogen caps a triangular face. VDEs for both anionic isomers as well as other energetic relationships were also calculated. Comparison of the measured versus …
Stable T2sin (T=Fe,Co,Ni,1≤N≤8) Cluster Motifs, R. Robles, S. N. Khanna
Stable T2sin (T=Fe,Co,Ni,1≤N≤8) Cluster Motifs, R. Robles, S. N. Khanna
Physics Publications
First principles studies on the geometry, electronic structure, and magnetic properties of neutral and anionic Fe2Sin, Co2Sin, and Ni2Sin (1≤n≤8) clusters have been carried out within a gradient corrected density functional framework. It is shown that these clusters display a variety of magnetic species with varying magnetic moment and different magnetic coupling between the two transition metal atoms. While Fe2Sin clusters are mostly ferromagnetic with large moments, Ni2Sin clusters are mostly nonmagnetic. Our studies of the variation of the binding energy upon addition of successive Si atoms and the gap between the highest occupied molecular orbital and the lowest unoccupied …
One Parameter Control Of The Size Of Iron Oxide Nanoparticles Synthesized In Reverse Micelles, M. D. Shultz, W. Braxton, C. Taylor, E. E. Carpenter
One Parameter Control Of The Size Of Iron Oxide Nanoparticles Synthesized In Reverse Micelles, M. D. Shultz, W. Braxton, C. Taylor, E. E. Carpenter
Chemistry Publications
Iron oxide nanoparticles were synthesized via reverse micelle methods. The initial iron concentration was varied, while maintaining all other parameters constant, in order to investigate the effect of the iron concentration on the resultant iron oxide nanoparticle size. Increasing the iron concentration from 0.125M to 0.5M yielded an increase in average nanoparticle diameter from 4.71 to 7.95 nm, as measured by transmission electron microscopy. Three other concentrations between 0.125M and 0.5M showed corresponding size variations, all with statistical significance. Magnetic characterization by vibrating sample magnetometry and powder x-ray diffraction was performed to verify proper phase and material. Further insight into …
Location, Location, Location: A Transaction Comparison Of Catalog Searches Originating From The Library Homepage And Aleph, Jimmy Ghaphery, Thomas Mcnulty, Susan Teague Rector
Location, Location, Location: A Transaction Comparison Of Catalog Searches Originating From The Library Homepage And Aleph, Jimmy Ghaphery, Thomas Mcnulty, Susan Teague Rector
VCU Libraries Faculty and Staff Presentations
Jimmy Ghaphery, Head, Library Information Systems, Virginia Commonwealth University (VCU); Thomas McNulty, Integrated Library Systems Librarian, VCU; Susan Teague-Rector, Web Applications Manager, VCU. We will analyze several weeks of search terms from February 2009 in order to determine how different points of entry impact user searches. Specifically we will compare user searches originating from a search tool on the library homepage and searches originating directly from Aleph. This session should be of interest to those who are involved with usability and OPAC design as well as system administrators tasked with measuring OPAC activity.
Tailoring Local Conductivity By The Formation Of Ag Nanoclusters In Sio2 Xerogel Films, Ricky Caperton
Tailoring Local Conductivity By The Formation Of Ag Nanoclusters In Sio2 Xerogel Films, Ricky Caperton
Theses and Dissertations
Porous silicon dioxide thin films were produced via dip-coating and doped with Ag+ by adding AgNO3 to the dipping solution. Nanoparticles were formed within the pores of these films by UV exposure. Nanoparticle formation was confirmed by UV-visible spectroscopy and Transmission Electron Microscopy (TEM). Conductive Atomic Force Microscopy (CAFM) showed that the conductivity of the films decreased upon exposure to UV. This decrease in the conductivity is most likely due to the clustering of charge carriers. Initially, Ag+ ions are attached to negatively charged pore walls in a dense packing network. Upon UV exposure (125 mW @ 266 nm), the …
Exploring Impact Of Educational And Economic Factors On National Intellectual Productivity Using Machine Learning Methods, Canon Fazenbaker
Exploring Impact Of Educational And Economic Factors On National Intellectual Productivity Using Machine Learning Methods, Canon Fazenbaker
Theses and Dissertations
The patent process is representative of a nationwide means for innovations and new ideas to be recognized. The U.S. Patents Office, since its inception in 1790, has issued nearly five million patents. These patents span from the U.S. Patent #1, which was for an improvement "in the making of Pot ash and Pearl ash by a new Apparatus and Process" to today's patents which deal with technologies and mediums that were unimaginable at the Patent Offices' inception. The purpose of this study is to determine what social and economic factors at the federal level have the highest impact on national …
Noncovalent Interaction Of Platinum Planar Amine Compounds With Tryptophan: A Strategy To Interfere With P53-Mdm2 Interactions And Targeting Retroviral Zn Finger-Dna Interaction (Hiv Ncp7), Aaron Bate
Theses and Dissertations
Non-covalent interactions involving π-π stacking play an essential role in self-assembly and molecular recognition processes such as protein folding and DNA/RNA-protein selective recognition. The knowledge gained from these studies could provide insight into possible site recognition complexes, inhibiting or mimicking protein-protein or protein-DNA interactions. Based on molecular modeling as well as HOMO and LUMO energies, several chromophores were selected with a variety of ∆ε values (∆ε= |εHOMO,NAcTrp – εLUMO,chromophores|), high and low, to establish a correlating trend with the modeling and experimental data. The corresponding Pt(dien) compounds were synthesized and their ability to stack to N-acetyl tryptophan was evaluated by …
Superhalogen Properties Of Cufn Clusters, Q. Wang, Q. Sun, P. Jena
Superhalogen Properties Of Cufn Clusters, Q. Wang, Q. Sun, P. Jena
Physics Publications
A first-principles calculation based on gradient corrected density functional theory reveals unusual properties of a Cu atom interacting with F. Up to six F atoms are bound to a single Cu atom with electron affinities steadily rising as successive F atoms are attached, reaching a peak value of 7.2 eV in CuF5. The large energy gaps between the highest occupied and lowest unoccupied molecular orbitals, both in neutral and anionic form, provide further evidence of their stability. These unusual properties brought about by involvement of inner shell 3d-electrons not only allow CuFn to belong to the class of superhalogens but …