Materials Literature
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Stabförmige Zinn-Template wurden in der Synthese von einkristallinen ZnS-Nanoröhren vom Wurtzit-Typ eingesetzt. Die ZnS-Nanoröhren entstehen als strukturell einheitliche Einkristalle und sind teilweise mit Sn gefüllt (siehe Bild). Die meisten der Nanoröhren sind gerade, haben Längen von einigen Mikrometern, Durchmesse…
Kurzfassung Im vorliegenden Beitrag werden spannungsanalytische und bruchmechanische Untersuchungen zum ICE-Radreifenbruch beschrieben. Das Risswachstum beim ICE-Rad begann am Innenrand des Radreifens. Der Riss wuchs zunächst mehr in die Tiefe des Radreifens, um sich später in halbelliptischer Form auszubreiten. Erst…
The effect of twisting jet pressure, nozzle di stance, deli very speed, yarn linear density and fibre composition on the performance and lowstress characteristics of polyester-cotton Murata vortex spun yarns has been studied. The coarser ya rns produced usi ng the sa me conditions exhibit hi gher abrasion resistance,…
Power transformers can be sources of disturbing and annoying acoustic noise. This paper is a first phase report of a wider framework of study that investigates the noise radiation characteristics of air-cooled power transformers. The dynamics of the transformer core structure plays a significant role in the noise gene…
The aim of this study was to prepare and characterize a controlled-release system (microspheres) loaded with ibuprofen, for intra-articular administration, to extend its anti-inflammatory effect in the knee joint cavity. Among the bioresorbable polymers employed, poly(D,L-lactic-co-glycolic) acid (PLGA) (13137 Da) was…
Both natural graphite (NG) and home-made expandable graphite (EG) were blended with polypropylene (PP) and intumescent flame retardant (IFR) by a melt process. The resulting composites contain filler of 1–5 phr (parts per hundred parts of PP–IFR). The limiting oxygen index (LOI) and thermal gravimetric analysis (TGA)…
A new analytical model of high-speed friction was developed to account for the observed velocity dependence in sliding friction at high speeds and was successfully applied to the analysis of data previously reported by Jones et al. for a number of concrete penetration tests using ogive-nose projectiles of high-strengt…
Addition of Y 2 O 3 as a sintering additive to porous β‐SiAlON (Si 6− z Al z O z N 8− z , z = 0.5) ceramics has been investigated for improved mechanical properties. Porous SiAlON ceramics with 0.05–0.15 wt% (500–1500 wppm) Y 2 O 3 were fabricated by pressureless sintering at temperatures of 1700°, 1800°, and 1850°C.…
This paper represents a continuation of the work published by Boardman et al., who concluded that the mechanisms of lime stabilisation were distinctly different for two clays of different mineralogy: English china clay, for which short-term flocculation is dependent on pH and long-term strength is dominated by the pro…
The effects of a decreasing top electrode size on the electric and piezoelectric properties of tetragonal Pb(ZrX,Ti1−X)O3 thin films are investigated. The effective piezoelectric small-signal coefficient d33,eff and the piezoelectric large signal-strain S are measured using a double-beam laser interferometer. Both pro…
Abstract Electrochemical impedance spectroscopy (EIS) has become an important tool in Solid State Electrochemistry. Simple Kramers-Kronig transform data validation assures selection of high quality data for subsequent CNLS-fit analysis. Optimized starting parameters and probable equivalent circuit can be obtained thro…
The magnetoelectric effect in ferrite-piezoelectric composites is considered. A theory of the magnetoelectric effect in the electromechanical-resonance region for disk-shaped samples is presented. The magnetooptical coefficient is calculated for longitudinal and transverse orientations of electric and magnetic fields.…
In this paper we extend the phase-field model of crystallographic slip of Ortiz (1999 J. Appl. Mech. ASME 66 289–98) and Koslowski et al (2001 J. Mech. Phys. Solids 50 2957–635) to slip processes that require the activation of multiple slip systems, and we apply the resulting model to the investigation of finite twist…
Effective use of surfactants for corrosion inhibition requires appropriate information about the application environment and metal as well as the properties of the surfactant. Surfactant adsorption, which is a prerequisite to corrosion inhibition by surfactant molecules, is dependent on the properties of the surfactan…
The tensile and stress‐rupture behavior of SiC/SiC minicomposite containing a chemically vapor deposited (CVD) ZrO 2 interphase was evaluated. Fractographic analyses showed that in situ fiber strength and minicomposite failure loads were strongly dependent on the phase contents and microstructure of the ZrO 2 interpha…
The interfacial effects are critical to understand the nanocomposite behavior based on polymer matrices. These effects are dependent upon the morphology of carbon nanotubes, the type of used polymer and the processing technique. Indeed, we show that the different parameters, as the eventual surfactant use, the ultraso…
Phosphorus-doped Si 0.8 Ge 0.2 thin films were deposited on the Si 3 N 4 /SiO 2 /Si substrate by the RF sputtering. Thermal annealing was carried out to crystallize as-deposited, amorphous-like SiGe thin films. With increasing annealing temperature and time, the crystallization of the SiGe thin films progressed, resul…
The present paper describes recent developments in the employment of ITO (In2O3:Sn) nanoparticles for the preparation of transparent conducting coatings and discusses capabilities and limits of this approach, especially for applications in display and smart window technology. Meanwhile, redispersible nanoparticles of…
The fundamental mechanism of room-temperature grain growth during self-annealing in electroplated Cu films has been an issue of great interest. We have investigated the microstructure evolutions in a variety of electroplated Cu films prepared with different plating rates and their correlation with the crystalline defe…
With thousands of machines monitored for as long as 25 years with the same method, on-line partial discharge (PD) testing has become a recognized, proven tool to help maintenance engineers identify which stator windings need off-line testing, inspections and/or repairs. With over 63,000 test results acquired with the…