Materials Literature
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4Gas-generating solid compositions usually include a compound that decomposes at high temperatures and an energetic additive that provides heat for self-sustained combustion. The present paper investigates the feasibility of using nanocomposite reactive materials produced by arrested reactive milling as energetic addi…
The effect of such factors as design of friction bearings, operational misalignments of shaft system supports, and degraded stiffness of the support system on the vibration reliability of steam turbine support elements is analyzed. The analysis is carried out using the data obtained from investigations of full-scale f…
The main interest of this research is to contribute to the development and understanding of supramolecular chemistry and molecular architectures, which are c...
AIMS: The detection of trace concentrations of biogenic sulfides can be carried out through radiorespirometric assays. The objective of this work was to improve the methodology for detection of H2 S in trace concentrations, to correlate with sulfate-reducing bacterial activity. METHODS AND RESULTS: Serial dilutions of…
Fully conjugated dendrimers are interesting materials as active chromophores for a range of optoelectronic applications. The rigid and well-defined framework of these materials enables structure-property relationships to be more easily understood. In this paper, we summarize the main strategies for the synthesis of po…
A kind of BN/SiC open-cell ceramic foams were fabricated from complex co-polymeric precursors of polycarbosilane and tris(methylamino)borane [B(NHCH3)(3)] using a high-pressure pyrolysis foaming technique. The obtained foams exhibited cell sizes ranging from 1 mm to 5 mm with bulk densities varying from 0.44 g/cm(3) t…
It remains unclear, even for idealized systems, how the microstructure of porous solid explosives (e.g., particle size, shape, and packing) affects dissipative heating within compaction waves that is important for the weak initiation of detonation. In this study, we perform meso-scale simulations to computationally ex…
Catalytic efficiencies of atomic oxygen on several TPS surfaces are evaluated by actinometry. In this experiment, microwave discharged plasma of oxygen with argon is generated at the 18 Pa ambient pressure and microwave power of 1.3kW. In the actinometry, the spatial distributions of emission intensities of OI 844.6nm…
Cooling of Insulated Gate Bipolar Transistors (IGBT) is a huge problem to improve the energy efficiency. To improve the cooling efficiency, a material that has the high thermal conductivity is expected to be employed for the cooling system of IGBT. The authors have fabricated an aluminum based composite material conta…
Recycling human metabolic and plastic wastes minimizes cost and increases efficiency by reducing the need to transport consumables and return trash, respectively, from orbit to support a space station crew. If the much larger costs of transporting consumables to the Moon and beyond are taken into account, developing w…
Electrical properties of metal-oxide-semiconductor capacitors based on TiTaO thin films deposited by reactive magnetron sputtering on silicon substrates are investigated. Electrical and optical parameters of TiTaO films have been extracted. The formation of a silicon dioxide interfacial layer during the first stage of…
CeO2/TiO2 nano powders for the low-temperature selective catalytic reduction (SCR) of NOx prepared by the sol-gel method were characterized by structural, morphological, and physico-chemical techniques. The catalysts based on 10 wt%-CeO2/TiO2 were synthesized using a sol-gel method and their characteristics were compa…
A reduced state-to-state model is to be applied to the problem of internal energy exchange and molecular dissociation in nitrogen gas. The aim is to implement this model within the framework of the direct simulation Monte Carlo (DSMC) method. In order to simulate inelastic collision processes within DSMC, a detailed k…
Abstract In this study, the polysulfone (PSF) capsules containing graphite nanosheets (GNS) were successfully prepared by a phase inversion precipitation method. Scanning electron microscopy and thermogravimetry were employed in the characterization of the as‐prepared PSF/GNS composites capsules. Meanwhile, the adsorp…
A sample with a composition of 80 wt% Mg-14 wt% Ni-6 wt% TaF5 was prepared by reactive mechanical grinding. Its hydriding and dehydriding properties were then examined. The hydriding rate in the beginning was very high from the first cycle, even at a relatively low temperature of 553 K. At n = 1, the sample absorbed 4…
Different computational techniques have been used to study phenolic resins with the objective of developing methods for predicting the high temperature physics and chemistry of resins with sufficient accuracy to produce data for the engineering modelling codes used to design thermal protection systems. The building of…
Shape memory alloys have in recent years been shown to be an attractive lightweight alternative to traditional actuators due to their unique ability to recover high levels of plastic strain. Practical implementation of shape memory alloys, however, is often com-plicated by their hysteretic, non-linear, thermo-mechanic…
numbers of ODEs with comparable solution accuracy. The GPU implementation of the DVODE solver achieved a maximum speed-up of 7.7x over the baseline CPU run-time. The performance impact of mapping one thread to each ODE was compared to mapping an entire CUDA thread-block per ODE (i.e., multiple threads per ODE). The on…
The modern state of technology for making gas turbines around the world and heat-recovery combined-cycle units constructed on their basis are considered. The progress achieved in this field by Siemens, Mitsubishi, General Electric, and Alstom is analyzed, and the objectives these companies set forth for themselves for…
A coupled simulation method is developed by using a Multi-Phase-Field (MPF) method that is recognized as a powerful numerical method for simulating microstructure formation in material and ElastoPlastic Finite Element Analysis (EP-FEA) based on a homogenization method. We apply the developed simulation method to inves…