Materials Literature
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This study aims to evaluate characteristics of hydrogen embrittlement cracking (HEC) of sensitized duplex stainless steel with simulated heat-affected zone (HAZ). The HEC of the steels, aged for 20hr at 650°C, 750°C and 800°C, were studied using a testing machine which can control the stress intensity factor, K, for t…
Parafusos corticais são submetidos a tensões de torção durante sua inserção e retirada. Portanto, um dos objetivos deste trabalho foi avaliar o comportamento mecânico dos parafusos corticais de aço inoxidável, quando submetidos a dois tipos de ensaios de torção, o manual e o realizado em uma máquina de torção. O outro…
The calculations of boundary problems by different plasticity theories give different results for many applied problems. One of these reasons is complex loading. Because, calculation of structures and installations which operate under plastic strain conditions, have been done on the basis of simplified stress-strain c…
The solution of a boundary-value problem formulated for a modified Kretschmann configuration shows that the phase speed of a surface-plasmon wave guided by the planar interface of a sufficiently thin metal film and a chiral sculptured thin film (STF) depends on the vapor incidence angle used while fabricating the chir…
This paper deals with the transient thermal analysis of carbon nanotube composites via meshless element free Galerkin method. A three-dimensional representative volume element containing single nanotube has been taken as model for these simulations. Essential boundary conditions have been enforced via penalty approach…
Synthesis of n-type Fe0.98Co0.02Si2 thermoelectric materials with dispersion of fine Ag particles was tried by mechanical milling of Fe-Si powder with AgO powder and subsequent hot pressing. The AgO phase was reduced by Si, resulting in precipitation of Ag particles, SiO2 phase and ε-FeSi phase. Most of the Ag particl…
The synergism of hydrogen bond-type ultraviolet absorbers (UVA), such as phenyl salicylate and benzotriazole type UVA, and hindered amine light stabilizers (HALS) was investigated and compared with that of benzophenone type UVA. Phenyl salicylate and benzotriazole type UVA showed a similar synergistic and antagonistic…
The deformation mechanism of the extruded cylinder of AZ31 magunesium alloy depending on a condition of temperature and loading path was studied by a multi-loading test under various temperature conditions and an observation of its microscopic structure after the plastic deformation. From the experimental results, AZ3…
The Smart Joint, developed at Cornell University, is a composite device which functions as both a structural element and shape changing mechanism. Through resistive heating, the device will provide a tip deflection on the order of 5–20% of its undeflected length, with a high specific work capability. The joint possess…
Transparent conducting oxides (TCO) with p-type semiconductivity have recently gained renewed interest for the fabrication of all-oxide transparent junctions, having potential applications in the emerging field of 'Transparent' or 'Invisible Electronics'. This kind of transparent junctions can be used as a "functional…
Calcium lactate was prepared by neutralization of lactic acid and precipitated calcium carbonate (PCC). And, effects of PCC morphology (calcite and aragonite) on calcium lactate by the solution process was investigated experimentally. Despite the slow forming rate at the initial stage, the final yield of calcium lacta…
In this study, Powder X-ray diffraction (XRD)/Rietveld analysis, which has been utilized in recent years as a technique for quantifying the crystal mineral phase of cement and cement paste, was applied to quantify the reaction rate of cement minerals and the proportions of hydration products. Its accuracy and availabi…
Pulse annealing has been the subject of several studies in recent years. In its basic form, it consists of relatively short-time optically stimulated luminescence (OSL) measurements of a given sample after annealing at successively higher temperatures in, say, 10°C increments. The result is a decreasing function with…
In this study the production of Si3N4-B4C composites using spark plasma sintering technique was studied. This technique was preferred in order to minimize the reactions between starting constituents. Fully dense Si3N4 ceramic was obtained by SPS. The bulk densities of all the produced composites was found to be signif…
Self-assembling peptides can serve as building blocks for novel biomaterials. Replica exchange molecular dynamics simulations are a powerful means to probe the conformational space of these peptides. We discuss the theoretical foundations of this enhanced sampling method and its use in biomolecular simulations. We the…
Echinoid fossils are a minor yet widespread component of siliciclastic marine deposits of Paleocene and Eocene age in Texas. Echinoids are found in the marine siliciclastic units of the Wills Point Formation (lower Paleocene); the Sabinetown Formation (lower Eocene); the Reklaw, Weches, and Cook Mountain Formations (m…
In this study, a nanofiber mesh made by co-electrospinning medical grade poly(epsilon-caprolactone) and collagen (mPCL/Col) was fabricated and studied. Its mechanical properties and characteristics were analyzed and compared to mPCL meshes. mPCL/Col meshes showed a reduction in strength but an increase in ductility wh…
A dissolution experiment was carried out to identify the effects of milling condition on dissolution kinetics of silicate rock fertilizers. Initially ground materials (Ø < 250 μm for basalt, dolerite, gneiss, and Ø < 150 μm for K-feldspar) were further milled with a ball mill (Spex 8000) under dry and wet condit…
Self-propagating low temperature combustion method for the synthesis of LiMn 2 O 4 is reported. Synthesis of LiMn 2 O 4 was carried out by thermal decomposition of lithium oxalate and manganese oxalate precursors employing poly(ethylene glycol) (PEG) as a fuel. The prepared LiMn 2 O 4 was then characterized for struct…
PbS hollow spheres were successfully prepared by a sodium citrate-assisted hydrothermal process at 120 degrees C for 12 h, employing lead acetate trihydrate, thiourea and sodium citrate as precursors. The diameter of PbS hollow spheres is 200-400 nm, which is composed of about 50-80 nm nanoparticles. The synthesized p…