Browsing Physics by Title
Now showing items 1425-1444 of 2104
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Packing soft spheres: experimental demonstrations with hydrogels
(2023)We describe a number of different experimental set-ups that use hydrogel spheres to demonstrate dense packings of deformable spheres in various geometries. The arrangements are similar to those of bubbles in foams, ... -
Paramagnetic defects in thin carbon films
(Trinity College (Dublin, Ireland). School of Physics, 2003)This thesis is an investigation into paramagnetic defects in thin carbon films, their nature and the effects of deposition parameters and post deposition treatments. Electron paramagnetic resonance (EPR) is used to examine ... -
Passive thin film circuits of nanomaterials, inkjet printed on flexible temperature sensitive substrates
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018)The objective of my work is threefold, firstly, to prepare functional ink dispersions of nanomaterials at high concentration with a well-defined narrow size distribution; secondly, to pattern low resistance, semiconducting ... -
Patterning metallic electrodeposits with magnet arrays
(2012)The influence of a pattern of a magnetic field on the structure of metal deposits at the cathode of a small electrochemical cell is investigated for cobalt, nickel, copper, and zinc. The different magnetic properties of ... -
Pauli paramagnetism of cubic V3Al, CrVTiAl, and related 18-electron Heusler compounds with a group-13 element
(2021)Calculations suggest that ordered Heusler alloys with 18 valance electrons could exhibit a variety of unusual electronic and magnetic states that are absent in the constituent elements. They include magnetic semiconductors, ... -
Perceptions of light pollution and its impacts: Results of an Irish citizen science survey
(2020)Background: Light pollution is increasingly an area of concern for health and quality of life research. Somewhat surprisingly, there are relatively few descriptions of perceptions of light pollution in the literature. The ... -
Percolation Effects in Electrolytically Gated WS <inf>2</inf> /Graphene Nano:Nano Composites
(2019)Mixed networks of conducting and non-conducting nanoparticles show promise in a range of applications where fast charge transport is important. While the dependence of network conductivity on the conductive mass fraction ... -
Percolation scaling in composites of exfoliated MoS 2 filled with nanotubes and graphene
(2012)Applications of films of exfoliated layered compounds in many areas will be limited by their relatively low electrical conductivity. To address this, we have prepared and characterised composites of a nano-conductor ... -
Percolation-dominated conductivity in a conjugated-polymer-carbon-nanotube composite
(1998)We have made electrical measurements on a system using carbon nanotubes as the dopant material. A semiconjugated, organic polymer was mixed with carbon nanotubes to form a wholly organic composite. Composite formation from ... -
Percolaton effects in nanostructured thin films
(Trinity College (Dublin, Ireland). School of Physics, 2013)Typically, materials with high electrical conductivity such as metals are opaque, and materials with high optical transparency such as glass are insulating. Finding materials that are both transparent to visible light and ... -
Performance and preliminary calibration of the Hopkins ultraviolet telescope on the Astro-2 mission
(American Astronomical Society, 1995)An improved version of the Hopkins Ultraviolet Telescope (HUT) made its second flight on the Astro-2 mission aboard the Space Shuttle Endeavour from 1995 March 2--18. The longer mission duration and greatly improved pointing ... -
Permanent magnet variable flux sources.
(IEEE, 1994)Rotatable transversely-magnetized permanent magnet rods can be used to generate variable, uniform magnetic fields or field gradients. A four-rod device for use at the specimen stage of an optical microscope is described ... -
Perpendicular exchange bias effect in sputter-deposited CoFe/IrMn bilayers
(2014)CoFe/IrMn bilayers with perpendicular magneti zation for various IrMn layer thicknesses exhibit unusual two-step hysteresis loops with both posi tive and negative loop shifts. Observed at room temperature in the as-grown ... -
Perpendicular Magnetic Anisotropy in CoFeB/Pd Bilayers
(2010)Perpendicular magnetic anisotropy is observed in ultrathin (0.6 nm) amorphous Co40Fe40B20 when sputtered on an MgO (001) buffer layer and capped with Pd. The layers are superparamagnetic with a blocking temperature of ... -
Perpendicular magnetic-anisotropy in iron films produced by laser chemical vapor-deposition of FE(CO)5
(IEEE, 1990)Uniform thin films of polyc r y s t a l l i n e a -iron are obtained by decomposing a stream of Fe(C0)s in a flow reactor using 193 nm ArF excimer laser pulses. The films are optically flat and 2.6 pm thick, but have ... -
Persistent current and Drude weight for the one-dimensional Hubbard model from current lattice density functional theory
(2012)The Bethe ansatz local density approximation (LDA) to lattice density functional theory (LDFT) for the one-dimensional repulsive Hubbard model is extended to current-LDFT (CLDFT). The transport properties of mesoscopic ... -
Perspective and Prospects for Rare Earth Permanent Magnets
(2020)Rare earth permanent magnets constitute a mature technology, but the shock of the 2011 rare earth crisis led to the re-evaluation of many ideas from the 1980s and 1990s about possible new hard magnets containing little or ... -
A pertubative approach to the Kondo effect in magnetic atoms on nonmagnetic substrates
(2011)Recent experimental advances in scanning tunneling microscopy make the measurement of the conductance spectra of isolated and magnetically coupled atoms on nonmagnetic substrates possible. Notably these spectra are ... -
Perturbative approach to the Kondo effect in magnetic atoms on nonmagnetic substrates
(2011)Recent experimental advances in scanning tunneling microscopy make the measurement of the conductance spectra of isolated and magnetically coupled atoms on nonmagnetic substrates possible. Notably, these spectra ...
