Materials Literature
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Porous SiC ceramics were fabricated by the carbothermal reduction of polysiloxane-derived SiOC containing hollow microspheres followed by sintering. The effect of the Al2O3–Y2O3–CaO (AYC) content on the microstructure and flexural strength of the porous SiC ceramics were investigated. The growth of large platelet α-Si…
Hyperbranched poly(amidoamine)s with high density tertiary nitrogen (HPAMAMs-OH) were prepared via the two-step reactions. Firstly, hyperbranched poly(amidoamine)s (HPAMAMs) were synthesized by Michael addition of 1-(2-aminoethyl) piperazine (AEPZ) and methyl acrylate (MA) and then alkylation of the residual amino pro…
We present Monte Carlo simulations of liquid-crystalline material confined to a nanoscopic slit-pore. The simulations are carried out under isothermal conditions in a specialized isostress ensemble in which N fluid molecules are exposed to a compressional stress τ‖ acting on the fluid in directions parallel with the s…
Grain boundary engineering (GBE) primarily aims to prevent the initiation and propagation of intergranular degradation along grain boundaries by frequent introduction of coincidence site lattice (CSL) boundaries into the grain boundary networks in materials. It has been reported that GBE is effective to prevent passiv…
Abstract The work shows some results concerning a new cermet material 40 vol.% [(Cu)–Ni]–YSZ processed by mechanical alloying followed by Sintering by Activated Surface method. The projected cermet microstructure for this application is expected to possess microstructural characteristics that lead to better electric a…
The first examples of trinuclear complexes of any dipyridyltriazole, [Fe(II)(3)(Rdpt)(4)(NCS)(6)], are, respectively: [HS-HS-HS] when Rdpt = phdpt and "[LS-HS-LS]" when Rdpt = ibdpt.
Single-Molecule Magnets (SMMs) are much investigated for the development of high-density information storage systems or the implementation of quantum algorithms for computation. For both applications the control of the magnetic state is paramount. So far only partial success at achieving such an aim has been reported.…
Samples of rubber seed shells were carbonized at varying temperatures (100, 200, 300, 400, 500, 600, 700, 800?C) for three hours each and sieved through 150?m screen. The portion of the rubber seed shell carbon that passed through the screen was characterized in terms of loss on ignition, surface area, moisture conten…
By experimentally examining and theoretically analyzing the Raman spectra of Si(x)Ge(1-x) nanocrystal-embedded silica films, we show that the 430 cm(-1) Si-Si optical phonon mode can be used as a fingerprint to identify the existence of local silicon cluster nanostructures inside Si(x)Ge(1-x) nanocrystals with high si…
Vegetable oils are a renewable source for the production of oleochemicals. Oils with high oleic and low saturate content may be an excellent source for producing epoxy resins because of the uniform distribution of cross-linking sites. Bio-based epoxy resins can be used as matrix components for composite materials. Veg…
Samples of Ca1−xSrxHfO3 with x = 0.25, 0.50 and 0.75 have been studied. These oxides were synthesized using the high temperature solid state reaction method that can produce oxygen vacancies. The lattice and the hyperfine interaction parameters were determined. From these data it is possible correlate the behaviour of…
Collagen V, a fibrillar collagen with important functions in tissues, assembles into distinct chain associations. The most abundant and ubiquitous molecular form is the heterotrimer [alpha1(V)](2)alpha2(V). In the attempt to produce high levels of recombinant collagen V heterotrimer for biomedical device uses, and to…
Based on compressing coordinate transformation (CCT) that transforms a region into a smaller region, a rigorous method for designing a cloak with controllable open window is proposed. The open cloak consists of a portion of an ideal closed cloak and an independent system whose position and parameters can be controlled…
(Bi1−xLax)0.5Pb0.5Fe0.5Ti0.5O3 (BF‐PT) ceramics were prepared for x = 0.0, 0.2, 0.3, 0.4 and 0.5 using solid state reaction method. x = 0.0 samples were found to have tetragonal perovskite structure, same as that of PbTiO3 (PT), while in La‐substituted samples tetragonal distortion reduced and system turned cubic at 4…
The preliminary phytochemical screening was carried out on the crude extracts of the leaves of Butea Monosperma Lam along with ash values and extractive values on the powdered drug. The crude extracts were investigated for their anthelmintic activity against earthworms (Pheretima posthuma), roundworms (Ascardia galli.…
The photo-induced insulator-metal transition for silicon-based VO2 nanofilm is studied by THz time-domain spectroscopy (THz-TDS). Obvious variations of THz ray transmittance are observed before and after the CW laser beam exciting, and the conductivity of metallic-phased VO2 film in the THz region is calculated in the…
In this paper the possibility obtaining of upper bainite, lower bainite and martensite or their mixture in nodular cast iron with carbides has been presented. Conditions have been given, when in nodular cast iron with carbides for cooling at first in the form, then air-cooling auste-nite transformation to upper bainit…
The present paper presents an applicative solution of mathematical modeling and simulation for resistive heating elements. A frequently problem, which appears during the use of these ovens, is the rapid aging who leads to the break down of the heating resistors. This model allows the simulation of the transient self-h…
Hydrogen diffusion was studied in API grade X70 pipeline steel, simulated coarse grained heat affected zone (HAZ) and weld metal of type HBQ Coreweld using the electrochemical permeation technique.Hydrogen diffusion measurements were carried out at 25 • C, 50 • C and 70 • C. The results were similar for all three meta…
Biointegration is essential for the successful performance of implanted materials and devices within the human body. With an increasing number and wide range of implant procedures being performed, it is critical that materials scientists and engineers effectively design implant materials which will create a positive b…