Materials Literature
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The regularities of the influence of temperature, velocity and degree of deformation, as well as heat treatment modes on the microstructure and properties of the EP741NP nickel alloy made by the hot isostatic pressing method are investigated. It has been shown that the heterogenizing annealing leads to the isolation o…
The present contribution reports on investigations of electrode temperatures for pure Cu electrodes and Cu-Cr electrodes of different diameters exposed to vacuum arcs with sinusoidal currents of 5-15 kA and an axial magnetic field up to 180 mT. It is found that surface temperatures of pure Cu electrodes are significan…
Abstract not provided.
Major incentives on wind and solar power and decreasing consumption have nearly stalled thermal power investments in Europe. While fossil fuels are facing strong political pressures, there seems to be a market for CO2 neutral thermal power and heat production. Today's market situation requires fuel flexible technologi…
The aim of this research is to fabricate functionally graded aluminium composite reinforced with 15 wt% alumina using centrifugal casting technique with dimensions of Øout160 x Øin145 x 150 mm and to investigate its threebody abrasive wear behavior. Hardness tests and microstructural examinations were performed at dis…
長期間にわたり海水作用を受けたコンクリートの表層には、局所的な膨張を伴うひび割れや脆弱化が生じる場合がある（以降海水劣化）。本検討では、海水劣化の原因を推定するため、暴露試験場において海水劣化の進行した試験体および暴露環境における共通要素を整理し、海水劣化が進行する条件について推定を行った。また、それらを基に海水劣化の発生要因を把握するため、熱力学的相平衡計算により水和物の組成変化を推定し、またそれによる体積変化を比較した。その結果、気温や日射に起因する温度変化や乾湿による空隙水の濃縮に伴うエトリンガイトの溶解・析出の繰返しが海水劣化の原因として作用した可能性があることを考察した。
Textiles of today are materials with applications in almost all our activities, we wear clothes all the time and we are surrounded with textiles in almost all our environments. Fibers, yarns, fabric and other structures with added-value functionality have been developed for a range of applications. Textile materials a…
Composites based on natural fibres as organic filler are studied for several years because traditional building materials such as concrete are increasingly being replaced by advanced composite materials (fibre reinforced cement). The current trend in the construction industry is the effort to achieve sustainable devel…
The prediction and manipulation of sessile droplet evaporation is an important problem with applications such as in microfluidics, printing, and microfabrication. The simple vapor diffusion model is frequently used to model droplet evaporation for the prediction of interfacial evaporation rates and evaporative flux, u…
Experimental studies show that Stone-Thrower-Wales STW defects generally exist in graphene sheets GSs and these defects considerably affect the fracture strength of GSs. Thus, prediction of failure modes of GSs with STW defects is useful for design of graphene based nanomaterials. In this paper, effects of multiple ST…
While tribology involves the study of friction, wear, and lubrication of interacting surfaces, the tribosurfaces are the pair of surfaces in sliding contact with a fluid (or particulate) media between them. The ubiquitous nature of tribology is evident from the usage of its principles in all aspects of life, such as t…
Fundamentals of electrospinning and electrospun nanofibers
The coming era of a "Trillion Sensors Universe" or "Nanosensors and the Internet of Nanothings" requires countless tiny sensor devices. Since surface enhanced Raman scattering (SERS) produces strong signals efficiently in such a tiny region of noble metal nanostructures with corresponding localized plasmon resonance,…
Abstract : A method for simulating dielectric breakdown in solid materials is presented that couples electro-quasi-statics, the adiabatic heat equation, and solid mechanics. These equations are coupled in several ways, including a temperature- and electric-field-dependent conductivity model, Joule heating, thermal exp…
Thin film of Cu2ZnSnS4 (CZTS) was deposited on Si(100) substrate by Pulse Laser Deposition (PLD) technique. The deposition was done in vacuum at 450°C. The formation of CZTS kesterite structure was confirmed by using XRD diffraction and Raman spectroscopy. The morphology and the elemental distribution of the obtained…
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Nano-sized Al (nAl) features high reactivity that, while desirable for effective energy conversion during the combustion, yields possible issues related to its storage. This paper investigates the ageing behavior of nAl under different relative humidity conditions (RH, from 80% to 10%) at the temperature of 333 K. Fre…
We proposed a new broadband contradirectional coupler composed by subwavelength grating (SWG) waveguides on silicon-on-insulator wafer. The 3-dB bandwidth can reach up to 29 nm and the length of coupling region is only 50 μm.
The novel terpolymer (1-N-4-SAPPDF-Resin-I) has been synthesized by polycondensation of 1-Naphthol-4sulphonic acid and p-Phenylene diamine with Formaldehyde in an acidic medium with molar proportion of reactants (1: 1: 2). To reveal the structure of the resin, the resin was characterized by elemental analysis and a sp…
Here we analyze the mechanical properties of nano-sized amorphous silica specimens under uniaxial tension at two temperatures (moderate and severe stresses) using the molecular dynamics method with Tersoff and ReaxFF potentials. The simulation results reveal quantitative differences in elastic properties and stress le…