Materials Literature
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We design and demonstrate experimentally a plasmonic directional beaming device with an expected beam angle, which consists of a slit-grooves structure in Au/Cr metal layers. The directional beaming phenomenon is achieved by modulating the phases of the radiation light diffracted by grooves from surface plasmon polari…
In this report, synthesis of graphene by oxidation-reduction method and chemical vapor deposition(CVD). The structure of graphene was characterized by TEM and Raman spectrum. A saturable absorber based on graphene which provides excellent optics characteristic is fabricated, and there are no changes in the structure a…
We apply the finite-difference time-domain method to numerically calculate the enhanced optical absorption of three nanostructures (i.e. nanorod, nanocone, and nanolens arrays) that were decorated on the surface of 2 μm thick crystal silicon (Si) thin-films. Compared with the nanorod and nanocone arrays, the nanolens…
In order to develop substrate materials for antenna miniaturization, we have synthesized nickel zinc ferrite nanoparticles and their polymer composites. The synthesized magnetic nanoparticles (MNP) were characterized with a host of methods to determine magnetic and dielectric, structural, and physical properties. The…
Despite impressive advances, precise simulation of fluid-fluid and fluid-solid phase transitions still remains a challenging task. The present work focuses on the determination of the phase diagram of a system of particles that interact through a pair potential, φ(r), which is of the form φ(r) = 4ε[(σ/r)(2n) - (σ/r)(n…
Electropolymerized polytyramine film was proposed for determination of uric acid in the presence of ascorbic acid. The influence of electropolymerization conditions on performance of the polytyramine film was examined to obtain the optimal experimental parameters. The voltammetric results demonstrated that polytyramin…
Grain boundary activity in nanocrystalline Al under an indenter is studied by using a multiscale method. It is found that grain boundaries and twin boundaries can be transformed into each other by emitting and absorbing dislocations. The transition processes might result in grain coarsening and refinement events. Disl…
Improvement of diagnostic methods for both power and Instrument transformer is crucial considering the part they play in electrical networks as well as their cost. Frequency response analysis based testing of transformers is one of the methods that have been introduced recently. This method enables the identification…
Bombardment of poly-para-xylylene films by a beam of potassium ions induces ion transport through the polymer material, which originally is an electrical insulator. The ion transport can easily be detected as neutralization current on an electrode at the back side of the film. The transport is accompanied by the forma…
This paper reports the synthesis of porous titanium with a nominal composition of Ti-6 wt%Al-4wt%V through a press-and-sinter process. Blended elemental (BE) mixtures of Ti and master alloy Al-40V powders were uniaxially pressed and sintered in vacuum. Porosity of the sintered samples was determined in the range of 23…
A dosimeter made with state of art polycrystalline Chemical Vapour Deposited (pCVD) diamond for applications in clinical radiotherapy has been manufactured, based on a large area (2.5 × 2.5 cm 2 ) film equipped with a matrix of contacts. A dose profile under an Intensity Modulated Radiotherapy (IMRT) beam for prostate…
Since few years the authors has focused on the measurement of SE of different materials using “alternative” measurement methods. In a paper recently published they compared two methods of performing Shielding Effectiveness measurements: an apertured TEM cell, used as emitter (“source”) in a GTEM, and the same aperture…
A Monte Carlo based computational model was developed to analyze the electrical transport properties in networks of randomly arranged single wall carbon nanotubes. The CNTs are modeled as stiff sticks with a lognormal distributed length. The average stick length and diameter size are deduced from a CNT film fabricated…
The enthalpies of dissolution of fibroin in imidazole-based ionic liquids were determined, and the contribution of polymer crystal structure decomposition to the enthalpy of dissolution was estimated. The heat of mixing of imidazole ionic liquid with water was described.
Al2O3/AlSi12CuMgNi composites were fabricated using gas-pressure infiltration (T=700°C, p=4 MPa) of an aluminium alloy into alumina performs. Volume fraction of the ceramic phase was up to 30%, while the pore sizes of the ceramic preforms varied from 300 to 1000 µm. Ceramic preforms were formed by method of copying th…
Almost every electrical equipment is provided with insulation. The quality of insulation is very important factor in deciding the life of the equipment. Different methods had been used for assessing the quality of insulation under various conditions. Partial discharge (PD) test is one among the most important tests fo…
Post-weld heat treatments were carried out in Ti-6Al-4V (Ti-6-4) weldments after a gas tungsten arc welding (GTAW) process. The α2-Ti3Al compound formed in the fusion zone (FZ) following the annealing process, whereas the γ-TiAl, α2-Ti3Al compounds formed in the FZ and heat affected zone (HAZ) respectively following a…
A newly designed microwave electron cyclotron resonance (ECR) plasma etching reactor has been developed for 450 mm wafer processing. The etching rates of polycrystalline silicon (poly-Si) and SiO2across the wafer were evaluated as a function of ECR position. Two-dimensional (radial and vertical) distributions of the i…
In this work, we report measured effects on the fluorescent emission spectra of commercially produced core-shell (CdSe/ZnS) quantum dots (QDs). We report the effects on the fluorescent emission spectra of commercially produced CdSe/ZnS QDs of 2.5 nm, 3.3 nm and 6.3 nm size in toluene, following exposure to ~1 MeV gamm…
Abstract The influence of talc and poly (methyl methacrylate) (PMMA)-grafted (g)-talc on the mechanical properties of poly (vinyl chloride) (PVC) was investigated. The graft copolymerization was carried out under nitrogen atmosphere, using the free radical initiation technique. The blend formulations were first dry bl…