Materials Literature
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Abstract Tool steels are an important class of steels due to their distinct applications and their specific heat treating issues. This article provides an overview of the classification and production of tool steels, and discusses the procedures and process control requirements for heat treating principal types of too…
Single crystals of the ErFe3(BO3)4 borate were synthesized and their structure was studied. Absorption spectra of the Er3+ ion in σ- and π-polarizations of f-f transitions 4 I 15/2 → 4 I 13/2, 4 I 11/2, 4 I 9/2, 4 F 9/2, 4 S 3/2, 2 H 11/2, and 4 F 7/2 were measured. The refractive index and birefringence were measured…
This paper deals with the idea of manufacturing and testing heating textile structures aiming to be integrated within wearable human clothes. The main idea was to design the electrical resistance of the embedded yarn in such a way that it can be operated with a low voltage battery in order to obtain a wearable system.…
Single phase LiTa1-xNbxO3 solid solution with 0.00 ≤ x ≤ 1.00 was successfully synthesised via conventional solid-state method at 950°C for 24 h. These materials were refined and fully indexed with hexagonal crystal system, space group of R3c; lattice parameters, a ranging from 5.1410(6) Ǻ to 5.1471(3) Ǻ and c ranging…
Starting from the discovery of graphene and its unique properties, there has been enormous progress in the production of atomic crystals that are strictly two dimensional (2D) and can be viewed as individual planes of atomic-scale thickness pulled out of bulk crystals like graphite, h-BN, several transition metal dich…
We have synthesized a novel type of donor–acceptor liquid crystalline material, phthalocyanine-fullerene ( Pc - C 60) dyad, [m,p,m′-( C 14 O )3 PhO ]6 PcCu - C 60 (7), and the Pc precursors, [m,p,m′-( C 14 O )3 PhO ]6 PcCu - OFBA (6) and [m,p,m′-( C 14 O )3 PhO ]6 PcCu - OH (5), and established their mesomorphism by u…
Highly disordered insulating materials exposed to high electric fields will, over time, degrade and fail, potentially causing catastrophic damage to devices. Step-up electrostatic discharge (ESD) tests were performed for two common polymer dielectrics, low density polyethylene and polyimide. Pre-breakdown transient cu…
In this paper the combined electro-thermal life model for the insulation of power cables is extended in order to include the volume enlargement law, whereby the statistical breakdown behavior with the increase of insulation volume is accounted for. In this way, a new comprehensive model is obtained, whose usefulness l…
The pollution flashover characteristics of insulators are tightly related to the salt dissolving out of pollution layer which makes contribution to surface conductivity of insulators in wetting process. For hydrophobic pollution layer on silicone rubber (SR) insulator, both the process of salt dissolving out and the p…
The site preference, the electronic structure and the magnetic properties of Co2ZrGe have been studied by using first-principles calculations, and the stabilities of the Cu2MnAl-type and the Hg2CuTi-type structures have been tested in this respect. The Cu2MnAltype structure is more favorable than the Hg2CuTitype struc…
We study the ab-plane resistivity and Hall eect in the single crystals of , where M = Co or Ni (0 y 0.21). In case of each dopant two types of crystals, with dierent crystalline quality, are prepared by Bridgman's method using dierent cooling rates, fast or slow. The impurities suppress the superconducting transition…
Titanium alloys have a number of features which make them attractive for use in aerospace, marine and chemical engineering, biological engineering, etc., due to their advantage of low density, high strength, and excellent corrosion resistance and biocompatibility. In this paper, Ti-6Al-4V (Ti-64) rods were prepared by…
The study presents results of experiments and numerical analyses concerning thin-walled shells used as components of aircraft structures. The solution, which is proposed here, consists in stiffening such elements by means of integral ribs. A comparative analysis has been carried out between the suggested design soluti…
International audience
Poly(methyl methacrylate)/montmorillonite nanocomposites were prepared by in situ solution polymerization of methyl methacrylate monomer (MMA) in the presence of the organic modified MMT-clay (OMMT). The results showed that, the basal space of the silicate layer increased, as determined by XRD, from 13.81 to 20.48 Å.…
This paper presents the results of the experimental and simulation investigation concerning the influence of remanence in the core of a single-phase transformer at the no-load transient state. Experimental studies consisted of the discharge of the capacitor through the primary winding at several different values of th…
Three specimens of galkhaite from the Getchell mine (G), Nevada, USA; the Gal-Khaya As-Hg-Sb deposit (Gk), Yakutia, Russia; and Signols (S), Piedmont, Italy, have been fully characterized through single-crystal X-ray diffraction and electronmicroprobe analyses. Chemical data indicate the formulae [(Hg4.61Zn0.38Fe0.04)…
Objective: To investigate the bio-fabrication of silver nanoparticles (AgNPs) using aqueous leaf extract of Melia dubia (ALM) and test the antifungal activity of AgNPs against pathogenic fungi Aspergillus niger and Candida tropicalis. Methods: 10 ml of aqueous leaf extract of Melia dubia was added to 90 ml of 1 mM sil…
A new hybrid system is established to utilize the waste heat generated in a DCFC (direct carbon fuel cell). The hybrid system mainly consists of a DCFC with molten carbonate as electrolyte, a regenerator and a Carnot heat engine, where the Carnot heat engine is driven by the high-quality waste heat generated in the DC…
This work presents a study of the fatigue properties in the example of Swedish steel Hardox 400. Fatigue tests were carried out in the area of high and ultra-high cycle region. From the practical point of view the durability of some components in the automotive industry and similar technical applications such as speci…