Materials Literature
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Quantitative estimations of the coefficients of electromagnetic-acoustic transformation (EMAT) are presented in ultrasonic transmission and reception modes for different steels in wide ranges of temperatures of the tested object and magnitudes of the magnetic bias field. The contributions of various mechanisms to the…
We investigated the spin wave dynamics of CoFeSiB film, which has a stripe domain structure at a low magnetic field region (<1 kOe). We measured the spin wave excitation spectra by employing Brillouin light scattering. Abnormal field dependence and dispersion relations were observed, and they are similar to spin wave…
Abstract The paper represents a comprehensive although rather brief overview of the scientific activity of the Institute of Physical Metallurgy and Metal Physics (IMM), RWTH Aachen University, in the field of grain boundary physics for the past twenty years under the leadership of Professor Günter Gottstein.
The effect of uniaxial pressures (up to 200 bar) along the main crystallophysical axes on the spectral (300–750 nm) and temperature (77–300 K) dependences of the refractive indices n i (λ, T) of LiKSO4 crystals has been investigated. A baric increase in n i (λ, T) is revealed, which is caused by the increase in the el…
Precipitation hardening, or aging hardening, is one of the most widely adopted techniques for strengthening of aluminium alloys. During the precipitation process, three major mechanisms are involved: i.e. nucleation, growth and coarsening. Kampmann and Wagner have developed a powerful and flexible numerical approach (…
We have carried out delay time analysis for the high-frequency characteristics of AlGaN/GaN heterojunction field-effect transistors (HFETs) on sapphire substrates, focusing on a comparison between the effects of AlN and SiN surface passivation. HFETs with AlN passivation, in comparison with those with SiN passivation,…
The solubility of potassium nitrate in aqueous 2-propanol solution has been determined at the temperatures of (298.15 and 313.15) K and atmospheric pressure. The densities, viscosities, refractive indices, and electrical conductivities of potassium nitrate in water and in the saturated solutions of aqueous 2-propanol…
Major research and development efforts both in CSIRO and elsewhere aim to develop processes for commercial production of low cost titanium powder. These processes could reduce the current cost of titanium, but the major savings are expected to come by enabling powder metallurgical processes which transform these powde…
The phonon lifetime in GaN is known to exhibit a dependence on electron density. Recent noise measurements have also shown the lifetime to be temperature dependent. The source of these dependences is the coupling of the phonon and plasmon populations through the dielectric function. The effect of this anharmonicity is…
Carbon nanotube spun threads are becoming growingly important for various technological and medical applications. Threads can be spun directly from carbon nanotube arrays using age old method of spinning. The process involves two rotations about two mutually perpendicular axes viz. spinning nanotubes into thread from…
A novel approach is presented in this work for predicting the values of freezing point depression and boiling point elevation for electrolyte solutions at different concentrations on the basis of the Pitzer theories. This method treats the enthalpy change of the solution between the normal freezing point or boiling po…
Problem statement: Natural weathering is the most economic method of treatment in order to reduce the release of heavy metals present in the residue.Approach: The aim of the study was to optimize the minimum weathering times that were useful to reduce the lead release to within the Italian limits for landfill disposal…
In this paper, the dielectric constant and loss tangent of two new high-temperature ceramic materials, SiCN and AlPO4, are characterized using a novel measurement technique at microwave frequencies with high accuracy. These ceramic materials exhibit high thermal stabilities and corrosion resistance, enabling their use…
A new kind of thermo-responsive particles were prepared by the self-assembly technique, comprising poly(hydroxyvalerate-co-hydroxybutirate)-b-poly(N-isopropylacrylamide)/ (PHBHV-b-PNIPAAm) block copolymers. The hydrophilic part PNIPAAm was synthesized by Reversible Addition- Fragmentation chain Transfer (RAFT) polymer…
Abstract The effect of heat on the reaction system of glycine/aspartic acid and glycine/valine in the aqueous environment as well as in montmorillonite clay suspension with or without divalent cations (Ca2+, Mg2+ and Ni2+) has been investigated at 85°C±5°C for varying periods under prebiotic drying and wetting conditi…
A relatively simple formula for the mean distance between the ends of a model chain composed of elastic freely joined segments as a function of an extending force applied to its ends was derived. It was assumed that the stiffness coefficient, which characterizes the ability of the segment to extend and contract, is ra…
The mixed-ligand cyclometalated [M(Bt)(μ-Cl)] 2 and [(M(N∧N))(Bt)] + complexes (M = Pd(II), Pt(II); Bt − is the deprotonated form of 2-phenylbenzothiazole; and ( N∧N) is ethylenediamine (En) and orthophenanthroline (Phen)) are studied and described by 1 H NMR spectroscopy, electronic absorption and emission spectrosco…
Abstract Structure/activity relationship methodology has been applied to the problem of the prediction of the energetic molecule's sensitivity. This parameter knowledge is of great importance to increase the safety of operations in the field of synthesis and manipulation of such compounds. It has been shown that descr…
The use of temperature and time dependent material parameters is state-of-the-art in mechanical engineering. An advanced measurement method for the determination of moisture dependent parameters for micro and nano scale samples was developed. In combination with FE-analysis, this tool (involving time, temperature, and…
In this paper a previously proposed configuration of a Jerusalem cross frequency selective surface (JC-FSS) is optimized for operation in the 2.4 GHz ISM band. The new feature introduced in this paper is the addition of superstrate layer on top of the FSS. In practice the added layer accounts for the substrate of an a…