Materials Literature
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This paper deals with the computer simulation of the weft insertion process as a possible solution to avoid costly weaving trials when researching this process. A one-dimensional mathematical model of the yarn was developed, in which the behavior of the yarn is described by Newton’s Second Law. For this mathematical m…
The $\[$\varGamma(L^{1}(\varOmega;\mathbb{R}^{d}))$$ -limit of the sequence [Formula: see text] where E ε is the family of anisotropic singular perturbations E ε (u):=∫ Ω f(x,u(x),ε∇u(x)) dx of a non-convex functional of vector-valued functions E(u):=∫ Ω f(x,u(x),∇u(x)) dx is obtained where f is a non-negative energy…
Slow evaporation of a mixture of organic solvents containing meso-tetraphenylporphyrinato-magnesium(II), MgTPP and N -methyl-2-(4'- N -imidazolylphenyl)-fulleropyrrolidine, C 60 Im yielded, air stable, dark purple crystals. Determination of the structure by single crystal X-ray diffraction revealed two forms of slight…
Abst r act The crystal structure of olgite, ideally Ba (Na,Sr)2 Na [PO4]2, hexagonal, sample (I), a 5.5606(2), c 7.0450(6) Å, V 188.65(5) Å3, and sample (III), a 5.5492(2), c 7.0286(5) Å, V 187.44(4) Å3, Z = 1, D (calc.) = 3.904 (I) and 3.930 (III) g.cm–3, were refi ned in space group P3̄m1 to R1 indices of 2.73 and 2…
The point of zero salt effect (PZSE) is the soil pH value at which the magnitude of the variable surface charges is not changed due to variations in the ionic concentration of the soil solution. This property influences not only electrochemical phenomena occurring at the solid-solution interface but also the flocculat…
Effects of Nb addition on Ti-doped Nd-poor and B-rich composition are investigated. It is found that Nb addition improves the glass-forming ability of rapidly solidified Nd-Fe-B-Ti-based alloys, resulting in significant improvements of magnetic properties in a low cooling-rate regime. Moreover, magnetic properties of…
A number of archaeological copper based objects, presenting tin rich layers on the surface, dated to different periods and coming from very different geographical contexts in the Ancient World, are discussed in this paper. The different reasons for the presence of tin rich layers on the surface of ancient items have b…
We present an operability analysis and a design of a microreactor for hydrogen generation via methane partial oxidation used in unidirectional (UD) and reverse-flow (RF) modes of operation. We show that the reverse-flow operation is more robust with respect to a wide range of changes in reaction parameters. Furthermor…
Chrome shavings are the prominent solid wastes in tanning industry. Since chromium is known for its toxicity, the disposal of chrome shavings has been identified as a serious problem from the environmental point of view. At present, the popular utilization mode for chrome shavings is the manufacture of leather boards…
Abstract Grain boundary motion can be affected by a magnetic field if the anisotropy of the magnetic susceptibility generates a gradient of the magnetic free-energy density across the boundary. Due to this magnetic driving force, annealing of locally deformed single crystals in high magnetic fields results in growth s…
The degradation of polycyclic aromatic sulfur hydrocarbons (PASHs) in aqueous solutions due to sonochemical processes was studied. Benzothiophene (BT), and dibenzothiophene (DBT) in addition to two polycyclic aromatic hydrocarbons, namely phenanthrene (Phe) and naphthalene (Nap) were compared. Results showed that all…
The aim of this study was to investigate whether postcuring using electron beam irradiation had an effect on the bond strength of resin-to-base-metal after priming their surfaces using silicoating methods or functional monomers. Composite cylinders were bonded on a restricted area of 5 mm2 to flat rectangular titanium…
This investigation and morphology analysis of porous structure of some kinds of natural materials such as chicken eggshell, partridge eggshell, pig bone, and seeds of mung bean, soja, ginkgo, lotus seed, as well as the epidermis of apples, with SEM (Scanning Electronic Microscope) showed that natural structures’ pores…
Electronic structures of hexagonal ice (ice Ih), high-density amorphous ice (HDA), and very high-density amorphous ice (VHDA) are investigated using ab initio density functional theory (DFT) at 77 K under a pressure of 0.1 MPa, focusing on band structure, density of states (DOS), partial density of states (PDOS), and…
This paper presents an analytical approach to the analysis of a single-phase transformer with a virtual air gap. Four auxiliary windings with dc currents that locally saturate the core are embedded in the transformer core. Due to changes in the magnetic characteristics of the core a virtual air gap is created. The met…
Optical components operating in radiation environments, like nuclear facilities, High Energy Physics and space experiments, are exposed to fluxes of energetic particles, which may deteriorate the image quality. In order to avoid undesired failure of such components that is due to changes produced in the material optic…
Dielectric ceramics with compositions belonging to the Ba(Nd x Ti1−2x Nb x )O 3 with varying concentration of x were prepared through Solid State Sintering route using both conventional and microwave sintering. The phase transformations were studied by dielectric measurements in a wide range of temperature and frequen…
Application of fine-grained doubly oriented electrical steel sheets that have a strong {100}texture to synchronous interior permanent magnet motors has been investigated. The alteration in stator core material from high grade nonoriented electrical steel sheets to the doubly oriented material with a simple change in s…
Electric field‐induced deformations of homeotropic nematic liquid crystal layers were studied numerically. A positive sum of the flexoelectric coefficients and a small negative dielectric anisotropy of the nematic material were adopted. Finite surface anchoring strength was assumed. The flow of ionic current was taken…
Abstract Metal complexes of manganese(II), iron(II), and nickel(II) chlorides with acrylamide, [M( O ‐OC(NH 2 )CH=CH 2 ) 4 Cl 2 ] (M = Mn ( 1 ), Fe ( 2 ) and Ni ( 3 )), have been prepared and characterized by single crystal X‐ray diffraction, IR spectroscopy and elemental analyses. The complexes crystallize in the cub…