Modeling the Dynamic Deformation and Failure Modes in High Strength and Damage Tolerant Aluminum Alloys.
North Carolina State University Theses Mechanical and Aerospace Engineering.
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Spectrum of the Dirac Hamiltonian with the mass-hedgehog
It is shown that the square of the Dirac Hamiltonian with the isotropic mass-hedgehog potential in d spatial dimensions is the number operator of fictitious bosons and fermions over d quantum states. This result allows one to obtain the complete spectrum and degeneracies of the Dirac Hamiltonian with the hedgehog mass…
Prediction of wear mechanisms in high speed steel hobs using artificial neural network
In this paper back-propagation artificial neural network (BPANN) is employed to predict the wear of the gear hobbing tools. The wear of high speed steel hobs during hobbing has been studied. The wear mechanisms are strongly influenced by the choice of cutting speed. At moderate and high cutting speeds three major wear…
Research about cutting tool blade tribology under thermal conditions influence
The paper contains an appreciation regarding the actual stage of knowledge in metal cutting field from the viewpoint of tribologic aspects and defines main aspects related to cutting factors influencing tools wearing and lastingness. The paper shows a proposal of evaluation under dynamic conditions of thermal status,…
Energy loss of the electron system in individual single-walled carbon nanotubes
We characterize the energy loss of the non-equilibrium electron system in individual metallic single-walled carbon nanotubes at low temperature. Using Johnson noise thermometry, we demonstrate that, for a nanotube with ohmic contacts, the dc resistance at finite bias current directly reflects the average electron temp…
Silicon nanocrystals surface engineering by low-pressure plasmas and atmospheric-pressure microplasmas
We present here two different plasma-based approaches to provide suitable surface characteristics for quantum confined silicon nanocrystals. Silicon nanocrystals are initially synthesized by electrochemical etching and by laser fragmentation in liquid. Subsequently we have used on one instance a microwave low-pressure…
A Study on Applying Short Time Molding Method Using Novolac Benzo-Oxazine Resin
Being environmentally conscious in reducing CO2 output, is driving industries to be more efficient in using resources. Industries are also finding ways to reduce energy consumption for all aspects of manufacturing. The brake lining manufacturing process relies on electric power during the thermoset cure and post-cure…
MICROFLUIDIC SYNTHESIS OF DESIGNED COLLOIDAL PARTICLES USING STRUCTURED ELASTOMERIC MEMBRANES
We report a method for synthesizing various shaped colloidal microparticles using microfluidic devices with structured elastomeric membranes. These elastomeric membranes incorporated between two-layered channels have negative relief structures, and pneumatically actuated membrane leads to confinement of fluid inside s…
Magnetic Spin Diffusion at the Nanoscale in Multiphase Polymers and Molecular Complexes
This chapter contains sections titled: Magnetic Resonance Overview The Spin-Diffusion Problem Interdomain Communication via Magnetic Spin Diffusion: Description of the Modified Goldman–Shen Experiment Materials Magnetic Spin-Diffusion Experiments on Random Copolymers that Contain Disorganized Lamellae Magnetic Spin-Di…
Nonlocal Handbury-Brown Twiss Interferometry & Entanglement Generation from Majorana Bound States
We show that a one dimensional device supporting a pair of Majorana bound states at its ends can produce remarkable Hanbury-Brown Twiss like interference effects between well separated Dirac fermions of pertinent energies. We find that the simultaneous scattering of two incoming electrons or two incoming holes from th…
Preliminary investigation into the growth peformance and fibre characteristics of Calotropis procera Linn.
A study of the growth and fibre characteristics of Calotropis procera was conducted. Seeds, stems and fruits of Calotropis procera were collected from three different Provenances. Seeds from Provenances A (Ogun State) had the highest percentage germination rate (68.50 %) this was followed by Provenances B (Oyo State)…
Erratum:“Photoluminescence induced by thermal annealing in SrTiO3 thin film” [Appl. Phys. Lett. 95, 241906 (2009)]
In Figs. We have corrected the unit conversion error and present the revised Figs. 2 and 3 in this erratum. FIG. 2. Color online PL spectrum of the postannealed SrTiO 3 films taken at room-temperature. PL data of the as-grown film is shown together. The insets in the three panels show the PL images taken with a digita…
Plasma dynamics in graphite and SWNT probed by inelastic electron and X‐ray scattering
Abstract Graphite as well as bundled and freestanding single‐walled carbon nanotubes (SWNTs) are allotropes of sp2 carbon. However their dynamical structure factor S (q, w) differs greatly because of the very different dimensionalities and geometries. Here S (q, w) is experimentally accessed by means of inelastic X‐ra…
Modelagem numérica de alto nível de filtros do tipo Fabry-Pérot e de redes de difração holográficas para o instrumento BTFI
Agradeço também à Pró-Reitoria de Pós-Graduação pelo apoio financeiro na participação da conferência ADASS 2009 em Sapporo -Japão.Esta tese/dissertação foi escrita em L A T E X com a classe IAGTESE, para teses e dissertações do IAG."...And it takes some work to make it work ..." Jason Mraz Resumo O trabalho apresentad…
Homogeneous nucleation and anomalous dendrite growth in undercooled melts
Crystal nucleation in undercooled melts of pure Zr was studied by application of electriomagnetic and electrostatic levitation. Large undercoolings were achieved owing to containerless processing of te liquid sample. In case of eectrostatic levitation, the large undercoolings indicate the onset of homogeneous nucleati…
Measurement of W+charm production cross section at CDF
A measurement of the production cross section of a W boson and a single charm quark, W c , using soft electron tagging is reported. We trigger on high P T leptons (electrons and muons) and reconstruct 'lepton+jets' events offline. Approximately 4.3 fb -1 of data is analyzed. We use soft electron tagging to tag heavy f…
Modeling and Characterization of Near-Crack-Tip Plasticity from Micro- to Nano-Scales
Methodologies for understanding the plastic deformation mechanisms related to crack propagation at the nano-, meso- and micro-length scales are being developed. These efforts include the development and application of several computational methods including atomistic simulation, discrete dislocation plasticity, strain…
Macromolecule–Metal Complexes: Ligand Field Stabilization and Glass Transition Temperature Enhancement
This chapter contains sections titled: Ligand Field Stabilization Overview Methodology of Transition-Metal Coordination in Polymeric Complexes Pseudo-Octahedral d8 Nickel Complexes with Poly(4-vinylpyridine) d6 Molybdenum Carbonyl Complexes with Poly(vinylamine) that Exhibit Reduced Symmetry Above the Glass Transition…
Diffusion in Amorphous Polymers Near the Glass Transition Temperature
This chapter contains sections titled: Diffusion on a Lattice Overview of the Relation Between Fractional Free Volume and Diffusive Motion of Liquids and Gases Through Polymeric Membranes Free Volume Theory of Cohen and Turnbull for Diffusion in Liquids and Glasses Free Volume Theory of Vrentas and Duda for Solvent Di…
Dynamic and thermal aspects of tribologic processes in metal cutting
The mathematic model shown by the specialty literature suits to an uniform stationary thermal status, respective to the same temperature in the entire cutting and tool blade and time constant, quite far from reality even for a qualitative and phenomenological analysis. The hypothesis taken into consideration, accordin…