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Showing 1 to 20 of 166 for “"bcc"”.
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X-ray diffraction study of vacancies in bcc helium-3 and bcc helium-4
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-13T17:02:41Z No. of bitstreams: 1 1982_granfors.pdf: 4976253 bytes, checksum: e552b132221ed1a25b853f6b916a974f (MD5)
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Phase stability in ti/bcc multilayered thin films
… regime by providing a systematic study using Ti/bcc multilayered thin film architectures. The influences of lattice misfit, layer thickness, composition and chemical intermixing on the phase stability are determined. In situ thin film growth stresses of these materials are measured and correlated …
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Deposition and characterization of magnetron sputtered BCC tantalum
… structures: 1) body center cubic (bcc) phase, characterized by high toughness and high ductility and 2) a tetragonal beta phase characterized by brittleness and a tendency to fail under stress. It was found in this work that the bcc Ta coatings on steel can be obtained reliably by …
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First-principles studies on oxide nanoclusters in bcc Fe
… structural models for atomic clusters in bcc Fe which may contain O, Y, Ti, and vacancies (v) are investigated by Density Functional Theory (DFT) calculations. Results for clusters with identical numbers of constituents (O, Y, Ti, and v) are compared. The most important finding consists in …
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Diffusion of Titanium and Niobium in Bcc Titanium - Niobium Alloys
Made available in DSpace on 2015-05-13T15:22:15Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7913578.PDF: 1944553 bytes, checksum: 026e51f1b2f56552f5cbf752d5ed855a (MD5) Previous issue date: 1978
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KMC modeling of helium bubble clustering and evolution in BCC iron
The effect of helium in iron is an important issue in nuclear systems, as iron and iron alloys (steels) are the primary materials used for structural elements. Helium is known to cause embrittlement and decrease fatigue life, as well as aid creep and promote swelling. These effects can …
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Effects of Carbon on Fracture Mechanisms in Nanocrystalline BCC Iron - Atomistic Simulations
Atomistic computer simulations were performed using embedded atom method interatomic potentials in α-Fe with impurities and defects. The effects of intergranular carbon on fracture toughness and the mechanisms of fracture were investigated. It was found that as the average grain size changes …
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Phonon dispersion curves and atomic mean square displacement for several fcc and bcc materials
… face-centred cubic (fcc) and body-centred cubic (bcc) materials have been calclllated from the quasiharmonic (QH) theory, the lowest order (A2 ) perturbation theory (PT) and a recently proposed Green's function (GF) method by Shukla and Hiibschle. The latter method includes certain anharmonic …
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Thermal vacancies and phase separation in bcc mixtures of helium-3 and helium-4
… are reported, along with study of vacancies in bcc 4He . The vacancy concentrations in the 51% and 28% 3He mixed crystals are found to be as large as 5%. Progress is made toward characterization of the detailed temperature dependence of the vacancy concentration in all the crystals. The low …
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Helium behavior at fcc-bcc semicoherent interfaces: trapping, clustering, nucleation, and growth of cavities
… clustering and growth of clusters at fcc-bcc interfaces. Choosing Cu-Nb as a model fcc-bcc interface, a predictive Cu-Nb-He interatomic potential is constructed using density functional theory. These calculations show that two-body radial forces are sucient to describe interactions of He …
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Modeling of twinning as a deformation mechanism in iron (bcc) crystals and iron-based alloys
… expression for twin nucleation stress in bcc metals considering GPFE (generalized planar fault energy) and the dislocations bounding the twin nucleus. We minimize the total energy to predict the twinning stress relying only on parameters that are obtained through atomistic calculations, …
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Molecular Classification of Basal Cell Carcinoma of Skin by Gene Expression Profiling
… cancers (NMSC) including basal cell carcinoma (BCC) and squamous cell carcinoma (SCC) are more common kinds of skin cancer. Although these tumors share common pathological and clinical features, their similarity and heterogeneity at molecular levels are not fully elaborated yet. Here, by …
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Untersuchungen zur Rolle von Wnt5a beim Basalzellkarzinom
Das Basalzellkarzinom (BCC) ist der häufigste Tumor des Menschen. In fast allen bisher untersuchten BCC ist die Hedgehog/Patched (Hh/Ptch)-Signalkasade pathologisch aktiviert, was in der Mehrheit der Fälle auf inaktivierende Mutationen des Tumorsupporessorgens Ptch zurückzuführen ist. Daneben …
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Body coupled communication : the channel and implementation
… wrist or the waist. Body coupled communication (BCC) has been shown to have great potential in forming a BAN. This work expands the potential of BCC BANs by showing that BCC can include implanted nodes. Implants being able to implement BCC is an impactful discovery as previous BCC channel models …
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Fast, efficient generation of high-quality atomic charges
The novel AM1-BCC charge model quickly and efficiently generates high-quality atomic charges for organic molecules suitable for computer simulations in the solution phase. The concept of the AM1-BCC charge model is to produce atomic charges that emulate the HF/6-31G* electrostatic potential (ESP). …
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The potential for superlattice precipitate reinforcement in titanium-iron alloys
… featuring ordered B2 precipitates within a BCC matrix offers a promising possibility due to the potential synergistic benefits of a matrix with superlattice precipitates. The titanium-iron system is selected for this purpose, particularly as both are abundant elements, which should address …
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Basil cell carcinoma: an immunohistochemical assessment of P53, BCL-2 and CD138 in low and high-risk histological subtypes
Basal cell carcinoma (BCC) is the leading cancer in males and the second commonest cancer in females in South Africa. The cost to the health sector is expected to rise given the increasing global incidence rates, particularly of aggressive BCCs. Improved understanding of BCC is paramount to enhance …
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First Principles-Based Interatomic Potentials for Modeling the Body-Centered Cubic Metals V, Nb, Ta, Mo, and W
… potentials for the body-centered cubic (bcc) metals V, Nb, Ta, Mo, and W from data generated by first-principles density-functional theory (DFT) calculations. Comparisons of a wide range of computed materials properties to DFT calculations and experimental data test the quality of the …
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Effect of Nonequilibrium Defects Due to Phase Transformation on Diffusion in Beta Zirconium
The effect of the hcp(--->)bcc phase transformation on the anomalous diffusion characteristics of bcc zirconium has been investigated in this study. ('113)Sn and ('59)Fe tracers were used to typify the diffusing nature of self- and fast-diffusing atoms. A differential measurement of diffusion in …
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