Materials Literature
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An analytical electromagnetic model of a novel modular axial-flux switched reluctance machine is presented, providing details for the specific magnetic circuit of this configuration. Magnetic saturation and leakage fluxes are key factors: saturated designs lead to higher power dense switched reluctance machines in gen…
The aim of this paper is first to briefly describes a mathematical approach for the direct coupling of analytical formal solution of Maxwell's equations (AM) and magnetic equivalent circuits (MEC) (reluctance networks or permeance networks) methods for the electromagnetic modeling of electric machines. This coupling c…
The unidirectional carbon pultruded rod running through the tops of the stringers is a key design feature of the Pultruded Rod Efficient Unitized Structure (PRSEUS) concept as applied to aircraft fuselage structure. Reported herein are the test methods and results from a test campaign in which the strength of the rod/…
In the fatigue life assessment of adjustable telescopic steel prop joints subjected to cyclic loading is critical for determining the number of cycles before fatigue failure of 235GT steel materials. The research aims in this reported work were to develop a computational material model and 3D finite-element analysis m…
Results of measuring the thermal conductivity coefficient of silica dioxide Tarkosil T-50 nanopowder by a laser flash technique are reported. Experimental data on thermal conductivity of nanopowder in vacuum, in different gas media, and at different temperatures were obtained. Comparative analysis of thermal conductiv…
The paper is devoted to an analytical prediction of the force production capability of a quasi-Halbach PM excited tubular-linear synchronous machine (T-LSM). To start with, the air gap flux density is derived considering both PMs excitation and armature magnetic reaction. The no-load operation is then characterized wi…
A method is proposed for determining the decrease in the distance between nominally flat rough surfaces with similar hardness in the plastic deformation of the surface microprojections.
We have investigated the electron transport properties of a N24B24 molecule coupled to two metallic contacts with a combination of GW approximation and the non-equilibrium Green's-function technique. The calculations indicate that the four and three resonant tunneling peaks are seen for the density of states (DOS) cur…
A series of photocatalysts of un-doped, single-doped and co-doped nanometer titanium dioxide (TiO2) have been successfully prepared by template method using Fe(NO3)3·9H2O, La(NO3)3·6H2O, and tetrabutyl titanate as precursors and glucan as template. Scanning electron microscopy, X-ray diffraction, and N2 adsorption-des…
The structural and optical properties of Cu 2 ZnSnS 4 thin-film layers formed by reactive pulsed laser deposition in a H 2 S atmosphere at room temperature with the use of a Cu metal target and a Zn–Sn alloy target are studied in relation to the parameters of annealing in a N 2 atmosphere.
The structure and mechanical characteristics of a weld joint of 10Kh9K3V2MFBR steel (0.097 C, 0.17.Si, 0.54 Mn, 8.75 Cr, 0.21 Ni, 0.51 Mo, 0.07 Nb, 0.23 V, 0.004 N, 0.003 B, 1.6 W, 0.15 Cu, and Fe for balance, wt %) have been studied; the joint was produced by hand welding in an argon atmosphere using 03Kh20N45M7G6B w…
The thermodynamic characteristics of complexation between ethylenediamine-N,N'-disuccinic acid (H4Y; EDDA) and Ho3+ ion were determined calorimetrically and potentiometrically at 298.15 K and ionic strengths of 0.1, 0.5, 1.0, and 1.5 (KNO3). The logK, Δr G, Δr H, and Δr S values for the formation of HoY– and HOHY comp…
In this paper, we report our study on both bulk and surface polaritons generated in Multilayer system. The multilayer consists of ferroelectric and multiferroic with canted spins structure. The effective medium approximation is employed to derive the dispersion relation for both bulk and surface modes. Surface and bul…
Increasing customer demands for quality of the resulting metal, and in the first place, the impurities, metallurgists dictate need to develop new and improved technologies. Thus, a significant reduction in metal losses can be achieved by developing new complex alloy steels, special purpose, improving technology of the…
We previously found that the antibacterial activity of silver phosphate crystals on Escherichia coli depends on their structure. We here show that the cubic form of silver phosphate crystal (SPC) can also be applied to inhibit the growth of a plant-pathogenic Pseudomonas syringae bacterium. SPC pretreatment resulted i…
In the current research the maximum deflection of circular plates made of AA5010 and AA1100 alloys under blast load was investigated. Shock waves were produced by exploding a spherical charge in different distances from the center of plates. The ABAQUS software uses conwep equation for blast loading analysis. It was f…
Indoor radon measurements were carried out in dwellings in Erzurum province during the winter months of February 2012 to early April 2012 and the summer months of July 2012 to early September 2012. Nuclear track detector LR-115 was used for the measurements. According to the results of investigations, it was understoo…
This work studies the uncertainties of the adhesive contact problems for reduced size structures, e.g. the stiction failure of microelectromechanical systems (MEMS). In MEMS, because of the large surface to volume ratio, the surfaces forces, such as van der Waals forces and capillary forces, are dominant in comparison…
본 연구에서는 내 오존성을 향상시키기 위해 PFPE-diol을 도입하여 불소계 변성 폴리우레아를 합성하였다. 불소 함량에 따라 변성 폴리 우레아(PFDIA-10C, PFDIA-20C, PFDIA-30C)를 제조하였으며 각각의 폴리우레아는 불소를 10 wt%~30 wt% 포함하였다. 제조된 도막의 오존처리 전 후 질량변화를 조사하였고, 도막의 경도, 내마모성, 인장성능 그리고 신장율 등의 물성을 분석하였다. 또한 내 오존성 테스트(10 ppm, 336 h)후에 광학현미경을 통해 도막표면을 관찰한 결과 PFPE-diol의 함량이 20 wt% 이상 일 때 균열, 탈색 그…
저압터빈 최종 단 블레이드는 응축 증기 내 농축된 불순물에 의해 조성되는 부식환경 하에서, 고속회전에 따른 높은 응력이 부가되어 응력부식 균열에 의한 파손이 빈번히 발생된다. 이러한 가혹 환경 하에서 블레이드의 안정적 사용을 위해서 내식성과 고 강도 특성 등을 갖춘 12% Cr 마르텐사이트계 스테인레스 강을 널리 적용한다. 본 논문은 마르텐사이트계 스테인레스 강으로 제작된 최종 단 블레이드가 정상운전 중 갑작스럽게 파손되어, 원인진단을 위해 파손 및 건전 블레이드를 대상으로 기계적 물성, 파단면 및 미세조직 검사를 수행한 결과를 기술한 내용이다. 파손된 블레이드의…