Materials Literature
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Abstract Natürliche Eingebung : Amphiphile Polysaccharid‐ block ‐Polypeptid‐Copolymere wurden durch Klick‐Reaktion zwischen Alkin‐funktionalisiertem Dextran und Azid‐funktionalisiertem Poly(γ‐benzyl‐ L ‐glutamat) synthetisiert. Die Copolymere können sich zu kleinen Vesikeln anordnen (siehe Bild), wodurch eine neue Gen…
Shape-memory behaviour in multi-grain material is simulated using a molecular dynamics method. An embedded-atom-method potential for NiAl alloy is applied, and a sequence of conditions including loading, unloading, heating and cooling is imposed. Two types of grain arrangement are used, and the deformation and shape r…
Acid-catalyzed condensations between a dipyrrylmethane and a pyrrole bisacrylaldehyde gave an unusual stretched sapphyrin structure together with a hexaphyrin byproduct. A diazulihexaphyrin was prepared similarly. The highly diatropic sapphyrin analogue was isolated as a dication and was characterized by X-ray crystal…
In large permanent magnet motors, the permanent magnet in the motor is segmented into parts in order to reduce the eddy current loss. It is reported that the insulation between Nd-Fe-B sintered magnets is possible only by contacting the segmented permanent magnets without the insulation. But the mechanism for such a p…
Cobalt hexacyanoferrates, which exhibit thermally induced and photo-induced spin transitions, have been extensively studied as model materials for molecular-based photomagnetic solids. Synchrotron x-ray diffraction (XRD) experiments combined with magnetic measurements were used here to get some new insights in their d…
Anisotropic Ag nanoparticles were grown epitaxially on UV-irradiated rutile TiO 2 (100) and (110) single crystals in an aqueous AgNO 3 solution by photoelectrochemical reduction of Ag + . Under different conditions (0.1−10 mW cm −2 UV irradiation for 1 min−21 h in the presence or absence of ethanol or acetaldehyde or…
Abstract Aufrollbar : Ein Peptid‐Dendron‐Hybrid (PDH) kann selbstorganisiert entweder lösliche Nanoröhren oder amyloidartige Fasernetzwerke bilden. Die Strukturen wandeln sich ineinander um, wenn die Salzkonzentration oder der pH‐Wert verändert wird. An den hydrophoben Grenzflächen lagern sich in Wasser effizient hydr…
This paper describes a new accurate completely digital configurable computer-aided system for the simultaneous measurements of magnetic hysteresis loops and Barkhausen noise in a wide range of excitation frequencies (from 0.01 to 80 Hz) for the purposes of inspection of material properties and microstructure character…
Supported nickel oxide based catalysts of Fe/ Co/ Ni (10: 30: 60)-Al2O3 and Pr/ Co/ Ni (5: 35: 60)-Al2O3 that were prepared by wetness impregnation method showed potential catalysts for the in-situ reactions of H2S desulfurization and CO2 methanation from ambient temperature up to 300 oC. X-ray Photoelectron Spectrosc…
A new method to simulate the steady-state magnetic fields of blocking up for induction motor is proposed. The field-circuit coupled model is combined with time-periodic finite element (FE) method to reduce the CPU time. The inductances and resistances of the stator end windings and the rotor end rings are considered i…
We utilize a multifunctional atomic force microscope (AFM) cantilever applying highly localized temperature and electric fields to interrogate transport in single-wall carbon nanotube field-effect transistors (CNTFETs). The probe can be operated either in contact with the CNT, in intermittent contact, or as a Kelvin p…
Abstract In the paper we present and discuss magnetic properties of the Gd(Ni 1– x Fe x ) 3 crystalline compounds and their ball‐milled powders in a context of the magnetocaloric effect (MCE). Moreover, based on the obtained results, powders and composites with non‐magnetic (Cu) and magnetic (Fe) additions were prepar…
In this work an approach for modeling a transformer core taking into account magnetic hysteresis is presented. For this purpose, the inverse vector Jiles-Atherton hysteresis model is incorporated in a 2D finite element code. This model allows writing naturally the differential reluctivity tensor which can be directly…
The thermodynamic properties of the ferromagnetic perovskite ${\text{YTiO}}_{3}$ are investigated by thermal expansion, magnetostriction, specific-heat, and magnetization measurements. The low-temperature spin-wave contribution to the specific heat, as well as an Arrott plot of the magnetization in the vicinity of the…
Abstract Lithiated 4‐methyl‐2‐[(trimethylsilyl)amino]pyridine (Ap TMS H) undergoes a salt metathesis reaction with [ScCl 3 (thf) 3 ] and FeCl 3 , at low temperature in thf, to yield the homoleptic complexes [Sc(Ap TMS ) 3 ] ( 1 ) and [Fe(Ap TMS ) 3 ] ( 2 ). An analogous reaction with MnCl 2 , CoCl 2 and FeCl 2 using t…
In this paper, the vector magnetic property is explained first. And this paper also presents the magnetic characteristic analysis of the electrical machines by using the vector magnetic hysteretic E&S model. Furthermore, the dynamic E&S model, which can analyze the eddy current effect due to the distorted magnetic flu…
Oxygen diffusion coefficients, D, have been measured in poly(methyl methacrylate) (PMMA) films containing small amounts of a cinnamic acid derived cross-linker. In the technique employed, the time evolution of oxygen sorption into the film was monitored using the phosphorescence of singlet oxygen as a spectroscopic pr…
Vaterite is one of three polymorphs of calcium carbonate (CaCO 3 ) found in nature, the others being calcite and aragonite. Here the formation of vaterite from decomposition of ikaite (CaCO 3 ·6H 2 O) was investigated using synchrotron powder diffraction and scanning electron microscopy. The crystallite sizes of vater…
In this study, MD simulations of some face centred cubic (FCC) metals at nano-scale and under uniaxial tension were carried out. The effects of different loading rates of 5-200 m/s at constant temperature on the tensile behaviour and stress-strain curves were studied. The potential used in these simulations was Sutton…
This paper discusses the numerical implementation of a new vector hysteresis model, called the Della Torre, Pinzaglia and Cardelli (DPC) model, introduced as general hysteresis vector model for both isotropic and anisotropic magnetic materials. The present implementation is a 2-D one that uses any kind of hysteron des…