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Showing 1 to 20 of 155 for “"HCP"”.
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Thermal vacancies in HCP helium-4
… of thermal vacancies have been determined in hcp $\sp4$He as a function of molar volume. A sensitive strain gauge was used to measure the temperature dependence of the pressure in twenty crystals between 18.17 and 20.9 cm$\sp3$/mole. Absolute lattice parameters at low temperatures were …
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Thermal vacancies in hcp helium-4
… of thermal vacancies have been determined in hcp 4He as a function of molar volume. A sensitive strain gauge was used to measure the temperature dependence of the pressure in twenty crystals between 18.17 and 20.9 cm3/mole. Absolute lattice parameters at low temperatures were measured for many …
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Fast impurity diffusion in hcp Zr
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1996.
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Oxygen diffusion through titanium and other HCP metals
… for oxygen in 14 other hexagonal closed-packed (HCP) elements are studied, revealing that in most HCP systems the ground-state for oxygen is not the large octahedral site.
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Vacancies in low-density hcp helium-4 solids
The existence and behavior of ground-state and thermally-activated excitations in helium solids have been extensively examined by a variety of experimental and theoretical studies. Although these excitations are typically identified as vacancies, large discrepancies arise in exactly what their …
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Quasi-four-dimensional characterization of dislocation interactions in FCC and HCP systems
Dislocation/grain boundary and dislocation/dislocation interactions have been investigated in austenitic stainless steel and α-Ti systems using in situ deformation in a transmission electron microscope, diffraction contrast electron tomography for three-dimensional analysis, and electron …
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Momentum density of hcp and liquid helium-4 by inelastic neutron scattering
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-08T16:10:35Z No. of bitstreams: 1 1983_hilleke.pdf: 5067231 bytes, checksum: d2a10e07e8841e9e47edb13560536a33 (MD5)
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Modeling the deformation and failure behavior of FCC and HCP nanocrystalline materials
As foreseen by Richard Feynman in his famous talk titled There's Plenty of Room at the Bottom in 1959, scientists nowadays are miniaturizing structures in materials to achieve better performance as concerned in technical applications. Reducing grain sizes in polycrystalline materials into the range …
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Optical-optical double resonance study of the 3¹ A¹ state of HCP
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1995.
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Modelización microscópica del daño por irradiación en metales hcp (a-Zirconio) : efecto de la anisotropía en la difusión y evolución de defectos
… para el estudio especifico de materiales hcp, así como las modificaciones para incluir diferentes campos de tensión sobre los defectos. La tercera parte de esta tesis, capítulos 6 al 10, describe los principales resultados obtenidos en esta tesis doctoral. Comienza con el cálculo de los …
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Dissecting the puncturing device of the Type VI Secretion System: role of Hcp, VgrG and PAAR proteins in assembly and secretion of effectors
… of a tube formed by hexameric rings of Hcp, topped by a VgrG trimer and further capped by a PAAR-repeat protein. Current models suggest that a variety of effectors can be injected in one single lethal shot, each either non-covalently associated or directly fused with one of the proteins …
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Habitat Conservation Plan Implementation: Keeping Promises for Adaptive Management Within a "No Surprises" Policy
… species covered in Habitat Conservation Plans (HCP). Introduced in 1982 as an amendment to the Endangered Species Act (ESA), Habitat Conservation Plans are negotiated agreements that mitigate the incidental "take" (killing, harming) of endangered and threatened species during a development or …
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Metallic cobalt derived from cobalt nitrides for Fischer-Tropsch Synthesis
… crystalline phases: hexagonal close-packed (hcp) and face-centred cubic (fcc). Both these phases are active under FTS conditions, however, theoretical and reactor testing studies have found the hcp Co phase to be more active as a result of the hcp crystal structure having more favourable …
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First -Principles Prediction of Thermodynamics and Ordering in Metallic Alloys
… a grand-canonical cluster expansion for the hcp Al-Ag and perform ground-state search and Monte Carlo simulations to determine the metastable hcp Ag-Al phase diagram. We predict a new equilibrium hcp AgAl ground state with zero-energy domain boundary defects. From thermodynamic results, we …
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The influence of various factors on the results of carbonation, cover depth, half-cell potential and resistivity tests that are used in the assessment of reinforcement corrosion
… of these tests, namely the half-cell potential (HCP), cover depth, carbonation and resistivity tests was performed on several concrete structures on upper campus at UCT. The half-cell potential and resistivity tests were carried out across a four-month period between August and November 2018 …
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Mechanism for Gamma-Precipitation in Aluminum-Silver Alloys and Self-Assembly of Polyelectrolytes: Modeling of Complex Layered Materials
… fault (SF) formation and dislocation motion. Yet hcp precipitates form rapidly in Al-rich face centered cubic (fcc) Al-Ag, even as the energy difference DeltaEhcp-fcc between hcp and fcc solid solution increases with Ag content. Using ab initio methods, based on electron density functional theory …
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Social media and health communication for seniors
… can connect with their healthcare providers (HCP). Using separate personal and focus group interviews, this qualitative study sought to explore the ways in which seniors and HCP use social media as a means of communicating with each other. Results revealed that seniors perceived social media …
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Desarrollo de la modelización multiescala en agregados policristalinos HCP bajo solicitación mecánica inducida en curso de procesos de conformado : validación experimental en chapas de zinc texturado
Las chapas de zinc se caracterizan por tener muy buena maleabilidad y flexibilidad en combinación con una gran terminación superficial, lo que las hace ser ampliamente utilizadas en la industria arquitectónica en partes como techos, revestimientos, canaletas, entre otras, y además son aptas para …
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A Study of Dilute Aluminum and Vanadium Nmr in Alpha-Titanium and in Hydrogen Doped Alpha-Titanium (Knight Shift, Electron Distribution, Quadrupole Interaction, Anisotropic, Alloy(hcp))
Nuclear magnetic resonance was used to investigate Ti-1 at.% V, Ti-2 at.% V, Ti-1 at.% Al, Ti-2 at.% Al and in addition samples of these alloys containing 1 and 2 at.% H. Computer simulation of the absorption curves incorporates the effects of nuclear quadrupole and anisotropic shift interactions, …
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