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Viscosity Measurements on Powders with a New Viscometer
At a closer look powder is found throughout all kind of industries. Dough and sugar in the food industry, pigments in the paint industry and drugs in the pharmaceutical industry, just to mention a few. Even though powder is obviously a common substance of a product or raw materials and therefore ingredients have to be…
Evaluation of the low corrosion resistant phase formed during the sigma phase precipitation in duplex stainless steels
The duplex stainless steels, having a volumetric fraction of 50% ferrite and 50% austenite, conciliate high corrosion resistance with good mechanical properties. But, in many circumstances different phase transformations may occur, such as that responsible for sigma phase precipitation, which make the steel susceptibl…
Investigation of the chemical interaction in the TiC-Si3N4 system
Chemical interaction in the TiCSi3N4 system was investigated. Thermodynamic calculations and kinetic analysis were carried out for a number of powder mixtures with various TiC:Si3N4 molar ratios in the temperature range 1300-1750 °C. Stability regions of the TiC-Si3N4 composites were defined. It was shown that the mai…
Aluminium mass transfer and diffusion in water at 400–550°C, 2 kbar in the K2O–Al2O3–SiO2–H2O system driven by a thermal gradient or by a variation of temperature with time
Abstract Tube-in-tube experiments involving a time-dependent variation of temperature or a strong thermal gradient were conducted in order to decipher the transport and transfer of Al in a closed medium along with dilute water. Results show that the solubility and the transport of Al are controlled by the alkali avail…
Swelling Behavior and Mechanical Properties of Chemically Cross-Linked Gelatin Gels for Biomedical Use
Cross-linked gelatin gels are used as biomaterials in living tissues, either as bioadhesives or as devices for sustained drug release. As these applications involve surgical insertion of gels, the effect of cross-linking on mechanical properties is relevant. The effect of cross-linking on the gel water uptake is also…
New catalysis for fast bulk ring‐opening polymerization of lactide monomers
Abstract The ring‐opening polymerization of lactides has been studied in bulk using either 2‐ethylhexanoic acid tin(II) salt, Sn(Oct) 2 , or aluminum triisopropoxide, Al(OiPr) 3 , as the initiator over a wide range of temperature and monomer‐to‐initiator molar ratio. A high increase in the bulk polymerization rate has…
An Improved Mathematical Simulation of the Coupled Diffusion of Moisture and Heat in Wool Fabric
An improved mathematical model that takes into account the water vapor sorption mechanisms of wool fiber is developed to describe and predict the coupled heat and moisture transport in wool fabrics. The two-stage moisture sorption of wool is handled by a diffusion equation with two sets of variable water vapor diffusi…
Dielectric Properties of Fine‐Grained Barium Titanate Based X7R Materials
The next generations of multilayer ceramic capacitors are expected to have active ceramic layer thicknesses of 3 μm or less. To retain a reliable ceramic device, it is advantageous to engineer a uniform and fine‐grained microstructure. In this study, a dense ceramic (>96% of theoretical) with fine‐grained size (<…
Cool data: quantity AND quality
The use of cryo-techniques in macromolecular crystallography has increased enormously over the last eight years and has become a vital part of modern X-ray data-collection methods. This paper presents some reasons for the rise in popularity of cryo-techniques and a brief outline of the basic methods, followed by a det…
A Detailed Investigation of the Polarization-Dependent Surface-Relief-Grating Formation Process on Azo Polymer Films
We have carried out two-beam interference experiments to form surface-relief gratings (SRGs) on azo polymer films under different polarization combinations. The mechanism of SRG formation on azobenzene chromophore functionalized polymer films has been shown to depend on both the spatial variation of the intensity as w…
Effects of doping on the transport properties of CoSb3
Effects of doping on the transport properties of CoSb3 have been systematically investigated using Ni, Pd, and Pt as donor impurities. It is shown that the Hall mobility, the Seebeck coefficient, and the electrical conductivity depend strongly not only on the carrier concentration but also on these donor impurities. O…
Layer Charge Influences on the Hydration of Expandable 2:1 Phyllosilicates
Abstract The objective of this study was to investigate the influence of layer charge on the hydration of Mg-saturated expandable 2:1 phyllosilicates. Water retained by 12 Mg-saturated clays at 54% relative humidity was quantified gravimetrically. X-ray diffraction and total chemical analysis were used to determine th…
The Topotactic Transformation of Ti3SiC2 into a Partially Ordered Cubic Ti ( C 0.67Si0.06 ) Phase by the Diffusion of Si into Molten Cryolite
Immersion of samples in molten cryolite at 960°C resulted in the preferential diffusion of Si atoms out of the basal planes to form a partially ordered, cubic phase with approximate chemistry Ti . The latter forms in domains, wherein the (111) planes are related by mirror planes; i.e., the loss of Si results in the de…
Theory of Coherent and Incoherent Nuclear Spin-Dephasing in the Heart
We present an analytical theory of susceptibility induced nuclear spin dephasing in the capillary network of myocardium. Using a strong collision approach, equations are obtained for the relaxation rate of the free induction and the spin echo decay. Simulation and experimental data are well predicted by the theory. Si…
Imaging of Microwave Permittivity, Tunability, and Damage Recovery in (Ba,Sr)TiO3 Thin Films
We describe the use of a near-field scanning microwave microscope to quantitatively image the dielectric permittivity and tunability of thin-film dielectric samples on a length scale of 1 micron. We demonstrate this technique with permittivity images and local hysteresis loops of a 370 nm thick barium strontium titana…
Measurement of the local Jahn-Teller distortion inLaMnO3.006
The atomic pair distribution function (PDF) of stoichiometric ${\mathrm{LaMnO}}_{3}$ has been measured. This has been fit with a structural model to extract the local Jahn-Teller distortion for an ideal ${\mathrm{Mn}}^{3+}{\mathrm{O}}_{6}$ octahedron. These results are compared to Rietveld refinements of the same data…
Phase-field model of dendritic sidebranching with thermal noise
We investigate dendritic sidebranching during crystal growth in an undercooled melt by simulation of a phase-field model which incorporates thermal noise of microscopic origin. As a nontrivial quantitative test of this model, we first show that the simulated fluctuation spectrum of a one-dimensional interface in therm…