Materials Literature
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The presence of the pollution on the surface of the polluted insulators drive to the reduction of the electric performances of these equipments and lead, in some conditions, to the apparition of the flashover arc, and thus the current breakdowns of electricity. To face these problems, several solutions have been consi…
Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wroclawskiej 41. Monografie 14
In order to understand recession behavior and the amount of recession of Lu2Si2O7 in the combustion gas flow, sintered Lu2Si2O7 specimens were manufactured by hot pressing and exposed under various combustion gas flow conditions (T = 1300–1500 °C, P = 0.3 MPa, V = 150 m/s, PH2O = 27–69 kPa, t = 10h). After the exposur…
The goal of this study is to discern whether the irradiation-assisted stress corrosion cracking (IASCC) susceptibility depends on the source of hardening rather than hardening alone. A set of five hardened conditions of commercial 304SS were studied in which the level of hardening remained fixed while the contribution…
We present first-principles calculations of the solid-state portion of the Cu-Li phase diagram \nbased on the cluster expansion formalism coupled with the use of (i) bond length-dependent \ntransferable force constants and lattice dynamics calculations to model of vibrational disorder \nand (ii) lattice ga…
The Steven Impact Test and associated modeling offer valuable practical predictions for evaluating numerous safety scenarios involving low velocity impact of energetic materials by different projectile geometries. One such scenario is the impact of energetic material by a transportation hook during shipping, which off…
Abstract: The switching of high-voltage capacitor banks for reactive-power or voltage support can produce significant transients. It is well understood that reactors, pre-insertion resistors, pre-insertion inductors, and synchronous switching can mitigate the transients. Circuit inductance can limit peak currents but…
This paper describes the development of an LS-DYNA simulation of a vertical drop test of an ATR42-300 twin-turboprop high-wing commuter-class airplane. A 30-ft/s drop test of this aircraft was performed onto a concrete impact surface at the FAA Technical Center on July 30, 2003. The purpose of the test was to evaluate…
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Optical switches using two electro-optical effects in liquid crystals are proposed and investigated for incorporation in a switch matrix for optical networks. These two devices employ selective reflection in cholesteric layers and total reflection at the border between glass and nematic liquid crystal. Prototypes of t…
Seawater is a complex aqueous solution with large tendency for scale formation, which is usually ascribed to the scaling dissolved salts and suspended particles. Scale formation results in lots of problems in thermal processes like desalination and steam generation plants. In a typical desalination plant, about 40% of…
Mit der Einstellung der Braunkohlenforderung in vielen Tagebauen der ostdeutschen Bundeslander begann ein tiefgreifender Landschafts-und Strukturwandel in den betroffenen Regionen.Uber viele lahrzehnte hinweg harte der Braunkohlenabbau mit den tagebauiibergreifenden Absenkungstrichtem, der Zerstorung oder Beeintrachti…
By means of equal channel angular extrusion (ECAE) test, upsetting test and metalloscope, reheating microstructures of raw casting ingots, materials prepared by SIMA and materials extruded by ECAE in semi-solid state were investigated. The results show that compared with those of raw casting ingots and materials prepa…
Pore size distribution(PSD)and surface area(SA)are important physical characteristics for material application. Several analytical methods can be used to determine PSD and SA of materials by gas adsorption and gas permeametry. In this paper, two methods were used to determine the PSD and SA of several kinds of materia…
In order to discuss quantitatively the effect of functional groups of activated carbon fibers (ACFs) on electric double layer characteristics, ACFs with various amounts of functional groups were prepared from the same ACF by redox methods. The amount of functional groups of ACFs was compared between the method by back…
High-temperature creep resistance in cations co-doped polycrystalline Al2O3 was examined by uniaxial compression creep test at 1250°C. The dopant oxides used in this study were 0.1 mol% of YO1.5, ZrO2, SrO, MgO and TiO2. The creep rate in Al2O3 was significantly changed by cations co-doping. For instance, Zr/Y co-dopi…
The cavitation behavior in room-temperature deformation was investigated for Zn-22 mass%Al alloy by metallographical observations, and compared with that in high-temperature deformation. It was predicted from metallographical observation that the critical cavity radius of transition in growth mechanism from diffusion-…
Microstructural and textural evolution by continuous cyclic bending (CCB) and annealing in a high purity titanium sheet has been investigated. The hardness distribution through thickness in the CCBent sheet exhibits V-shape with marked difference between the surface and the inside. More deformation twins are observed…
Compression tests were performed at different temperatures in an 82.5%Cu-13.5%Al-4.0%Ni (mass %) single crystal, a composition giving the β′ (18R) thermally induced martensitic phase. In all cases, the non-twinned γ′ (2H) martensite was obtained after compression, so, the β′ → γ′ or β → γ′ martensitic transformations…
Abstract This paper is focused on the use of the Polarization‐Modulation Infrared Reflection‐Absorption Spectroscopy (PM‐IRRAS) for studying thin polymer films at interfaces. When forming a polymer film on a metallic substrate, for instance by spin‐coating, the characterization of the polymeric layer becomes very diff…