Materials Literature
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Electrically driven rapid vaporization of thin metallic foils can generate a high pressure which can be used to launch flyers at high velocities. Recently, vaporizing foil actuators have been applied toward a variety of impulse-based metal working operations. In order to exercise control over this useful tool, it is i…
The objective of this work is to study the influence of pyrolysis temperature on structural, surface morphology and gas sensing properties of the nanostructured SnO2 thin films prepared by spray pyrolysis technique. These films were characterized for the structural, morphological and elemental composition carried by m…
Despite the numerous advantages of planar transmitarray antennas over conventional lens antennas, transmitarrays have a narrow bandwidth. The goal of this paper is to present a design methodology for improving the bandwidth of transmitarray antennas through control of the transmission phase range of the transmitarray…
We consider model problems for the tear film over multiple blink cycles with heat transfer from the posterior side of the tear film. A nonlinear partial differential equation governs the film thickness on a moving domain in one space dimension and time. One end of the tear film moves in order to mimic blinking in the…
The aim of this study was to enhance the production of vitamin K2 by using N-methyl-N-nitro-N-nitroso-guanidine (NTG) and low energy ion beam implantation and optimizing the fermentation medium. Mutation resulted in 1.66-fold higher production of vitamin K2 than that of the parentl strain. The production by the mutant…
In the present paper, through the calculation based on Powers theories and models and the phase analyses by XRD, SEM and EDAX, the phase composition and microstructure of hardened cement asphalt pastes were studied. The results showed that the phase composition and microstructure of hardened cement asphalt pastes are…
Glass delamination has developed as a quality problem for primary packaging containers over the last years. Beside other factors the container production process can contribute to this phenomenon, and it seems mandatory to steer and control the critical parameters. With the Schott Delamination Quicktest, a rapid test…
The ability to evaluate the physic and mechanical characteristics (elastic modulus, hardness, and strength) of isotropic pyrographite by dynamic indentation has been shown. The reliability of the technique was confirmed by independent tests with the use of the ultrasonic method. The correlation between the physic and…
A concept of a solid-state lighting engine for artwork-specific illumination with controlled photochemical safety is introduced. The engine is based on a tetrachromatic cluster of colored light-emitting diodes wirelessly controlled via an external smart device. By using an instantaneous dimming functionality, the driv…
An experiment is described that determines the activation energy ( E a ) of the iodide-catalyzed decomposition reaction of hydrogen peroxide in a much more efficient manner than previously reported in the literature. Hydrogen peroxide, spontaneously or with a catalyst, decomposes to oxygen and water. Because the decom…
From a theoretical standpoint, we propose that the addition of oxygen enhances the luminescence for codoping europium and magnesium in gallium nitride. From the additional oxygen, donor levels are created to an energy range between the europium f*-level and the conduction band, whereas magnesium acceptor levels are be…
In this article we consider some integral means problem for certain classes of univalent analytic functions, in particular for the class of the starlike functions of order and for the class of -spirallike functions of order . Our investigation settles one of the open problems of Gromova and Vasil'ev. In addition, we s…
The purpose of this study was to evaluate the efficacy of silver nano-particles (SNP) and silver thiosulfate (STS) in extending the vase life of cut carnation (Dianthus caryophyllus L. cv. 'Tempo') flowers. Pulse treatments of SNP @ 0, 5, 10 and 15 mg l(-1) and STS @ 0, 0.1, 0.2 and 0.3 mM were administered to carnati…
A noncontact method to evaluate the acoustic nonlinearity of surface waves in a plastically deformed aluminum alloy is proposed. Line-arrayed laser beams modulated with slit masks were used for the generation of narrowband surface waves. A laser-ultrasonic detector using a two-wave mixing (TWM) approach was also emplo…
The traditional influence coefficient dynamic balancing method for multi-rotor series shafting, such as turbine-generator sets, gas turbines, compressor trains, and others, usually needs to startup many times using trial weights along the rotor. Based on finite element model analysis for the multi-rotor series shaftin…
Textile composite are used extensively in aerospace as they offer a 3D reinforcement in a single layer providing better mechanical properties in both in‐plane and transverse directions. This paper reports on the mechanical behavior of a plain weave textile fabric under the compressive loading. Unit cell geometry of th…
Abstract We describe herein how to control the orientation of polymer nanowrinkles and nanofolds with large amplitudes. Nanowrinkles were created by chemically treating thermoplastic polystyrene sheets to form a thin skin layer and then heating the substrate to relieve strain. By manipulating the strain globally and l…
Zn-TiO2 (Zn-Ti) composite films were produced on mild steel substrate by electro-deposition from zinc based chloride solutions. The thin film coating was investigated using scanning electron microscopy coupled with energy dispersive spectroscopy (SEM/EDS), x-ray diffraction and atomic force microscopy (AFM). The anti-…
MgO based magnetic tunnel junctions (MTJs) exhibit high tunneling magnetoresistance (TMR) and have potential applications in magnetic random access memories. This study addresses the role of interface in the Fe/MgO/Fe based MTJs. For present investigation, Fe/MgO/Fe multilayer stack on Si substrates is grown by electr…
Power system owners are facing major challenges, for example with changed electricity consumption and production patterns; more distributed generation and increased demand of cost efficiency while maintaining high reliability. The concept of dynamic rating can act as a part solution and implies that the capacity of a…