Materials Literature
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The present study deals with the determination of the activation energy of animal fat and crude glycerol from a biodiesel production plant. The activation energies were investigated by thermogravimetric analysis in the temperature range ofT = 25-600 °C. The transient experiments were run for every sample (10 mg) at fi…
The electronic band structure and density of states of (8,8) armchair and (14,0) zigzag single walled carbon nanotubes (SWCNT) are investigated using densityfunctional calculations. The band structure of the pure (14,0) zigzag nanotube indicates that it is a semiconductor where as the band structure of pure (8,8) armc…
Carbon nanotubes (CNTs) were serendipitously discovered as a byproduct of fullerenes by direct current (DC) arc discharge; and today this is the most-wanted material in the nanotechnology research. In this brief review, I begin with the history of the discovery of CNTs and focus on CNTs produced by arc discharge in hy…
Undoped and Co doped ZnO samples with two different percentage of Co content (1 %, 3 % ) were prepared by a chemical spray deposition technique. The effect of doping with cobalt on the absorption spectra of ZnO thin films has been studied. The optical transmission (T %) in the wavelength range (300-1100) nm of films d…
Abstract A novel visible-light-activated La
Effect of Free-Edges On Melt Pool Geometry and Solidification Microstructure in Beam-Based Fabrication Methods.Laser and electron beam-based additive manufacturing of Ti-6Al-4V are under consideration for application to aerospace components.A critical concern for these processes is the ability to obtain a consistent a…
Accelerator Driven Subcritical Reactors require a high currents of energetic protons. We compute the limits imposed by space charge, and explore what can be achieved using various proposed FFAG lattices. Limitations due to beam losses and reliability are also discussed
A material model to describe large de- formation of pressure sensitive adhesive (PSA) is pre- sented. A relationship between stress and strain of PSA includes viscoelasticity and rubber-elasticity. Therefore, we propose the material model for describ- ing viscoelasticity and rubber-elasticity and formulate rate form o…
An alloy of PbS has been prepared in an evacuated quartz tube (Pb: S = 50:50). The structure of the ingot examined by X-ray diffraction and found to be polycrystalline of cubic phase structure with dominate orientation at (200) plane. The PbS thin films have been deposited by thermal evaporation technique under pressu…
Octupole magnets can be used as a passive cure against transverse collective instabilities. The octupole field creates a betatron frequency spread due to amplitude-dependent tune shift and thus enhances Landau damping. The drawback is the reduction of the dynamic aperture (DA). Ultimately, a balance between collective…
This research which is based on the analysis of Multi-Wire Saw Cutting principle relates to slurry flow and temperature control in Multi-Wire Saw Cutting technology. Several relevant experiments were carried out to verify the feasibility of slurry flow control system's application in silicon cutting. According to the…
Digital based HVDC control and protection system are a common place reality. Experience since the initial installations of these digital control systems indicate clearly that at least one control system replacement can be expected in any system prior to the retirement of the entire system. Control systems have typical…
Numerous studies conducted in the past broadly assume that normally distributed parameters of a power system, load parameter values in particular, within a given range would lead to normally distributed critical eigenvalues of the system, i.e., electromechanical modes. Normal distribution of input parameters however d…
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We have performed a systematic first-principles investigation to calculate the electronic structures, mechanical properties, and phonon-dispersion curves of NpO2. The local-density approximation+U and the generalized gradient approximation+U formalisms have been used to account for the strong on-site Coulomb repulsion…
Here we report a prism made of stacked quasi-self-complementary extraordinary transmission surfaces which allows simultaneously left- and right-handed propagation within the V-band for vertical and horizontal polarizations, respectively and right-handed propagation within the W-band for both polarizations. The numeric…
Lanthanum-gallate powders (LSGM), with composition La1-xSrxGa1-yMgyO3-δ (0 ≤ x, y ≤ 0.2), were prepared using citrate solgel method. As-synthesized powders were calcined at 900°C, uniaxially pressed and sintered in air at different temperatures (up to 1450°C). Sintered samples contained cubic perovskite phase, while o…
Microstructure and creep strength at 650°C of two high-Cr ferritic heat resisting steels were investigated. 11Cr steel containing relatively high carbon, aluminum and nickel showed a significant drop in creep strength after 1000 h while 9Cr steel containing relatively low carbon, aluminum and nickel showed a recovery…
Polycrystalline Sr0.6K0.4Fe2As2 samples with various Pb additions (0-20 wt%) were prepared using a one-step solid state reaction. X-ray diffraction analysis shows no evidence for a chemical reaction between the Pb and the FeAs-based superconductor. However, the presence of Pb can affect the microstructure and supercon…
Dissolved hydrogen and nitrogen in steel can result in significant damage to the structural integrity of steel product. Evraz Regina Steel has developed a model for providing advance warning of hydrogen/nitrogen-related breakouts during continuous casting.