Materials Literature
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The usefulness of in-situ neutron and synchrotron X-ray powder diffraction methods is stressed presenting the current possibilities, limitations and potential of these techniques in the study of chemical processes. The opportunity of following the evolution of a chemical phenomenon as a function of an external or inte…
Low-rate dynamic contact angles on poly(t-butyl methacrylate) (PtBMA) were measured by an automated axisymmetric drop shape analysis profile (ADSA-P). The solid surface tension of PtBMA is calculated to be 18.1 mJ/m2, with a 95% confidence limit of ±0.6 mJ/m2. This value was compared to previous results with different…
This paper examines the design of the horizontal-axis washing machine by means of parametric modelling and the description of the motion of articles, e.g. clothes, in it during the washing process. A series of dimensionless factors is determined that characterise the horizontal-axis washing machine. These parameters c…
The preparation of ultra high purity niobium (“UHP-Nb”) from commercial starting materials (niobium metal or Nb2O5) requires the elimination of all impurities down to the ppm, sub-ppm or even ppb level. This is possible only by application of a complex technology comprising the following essential processing steps:(1)…
We developed the novel positive photosensitive polyimide coatings "PW-1000". The coatings have alkaline developablity as well as fine resolution. The coatings have wide focus margin also. In addition to these photolithographic performances, the "PW-1000" has good heat stability, solution stability, and plasma etching…
Five new megastigmane glucosides and one of their aglycones were isolated, along with (6S,9R)-roseoside, from the polar fraction of the leaves of Asclepias fruticosa, and the structures were determined by spectroscopic methods. Most of them have an epoxy-linkage between C-5 and C-11. The configurations at C-3 and C-9…
A series of polystyrene-based cationic copolymers (PSCC) were synthesized by copolymerization of styrene and the cationic comonomer vinylbenzyl trimethylammonium chloride. These copolymers can be used as internal paper sizing agents in a broad pH range. The effect of the charge density on the PSCC colloid properties w…
Many attempts to upgrade polystyrene have been made in the past. One of the last and most popular examples is the upgrading of polystyrene by stereo-controlled polymerization of styrene monomer, yielding a syndiotactic material. But the property profile of polystyrene can also be improved by stiffening the polymer cha…
Polyimides obtained from dianhydrides and diamines by the polycondensation are classified into four distinct categories according to the chemical structure of the monomers. Aliphatic polyimides derived from aliphatic monomers are soluble in organic solvents and form the colorless and flexible films, whereas most of fu…
To obtain the new idea on the improved optimum composite material structures, the fore-wing structures of Allomyrina dichotoma and Prosopocoilus inclinatus have been investigated using scanning electron microscopy. As a result, the structural characteristics of the fore-wing of beetles are made clear and some new know…
The power loss characteristics of Mn-Zn ferrites were observed up to 1 MHz at 25 mT as a function of temperature. At 100 kHz the temperature at which the power loss minimum occurred was near 70/spl deg/C, at 500 kHz 50/spl deg/C and at 1 MHz even lower. The contribution of eddy current loss to the temperature dependen…
In this paper a study of the temperature-dependent luminescence properties of europium-doped yttria-stabilized zirconia (YSZ: Eu) powder are presented with a view to evaluating the potential of this material and lanthanide-doped YSZ generally for temperature measurement in the thermal barrier coating systems used in g…
The chemical bond in ferroelectric ABO3 perovskites has been considered as a mixed ionic-covalent one. The effect of covalency on the structure has been analyzed using valence bond theory. A particular attention has been paid to the π bond formation and resulting distortion of the lattice. A role of two ferroelectrici…
The feasibility of using sculptured thin film technology to engineer multiphase low-permittivity (also called low-k) materials for microelectronic and electronic packaging applications is established via a numerical study. The chosen films are theoretically modeled as multiphase, uniaxial, dielectric nanocomposite mat…
The crystal properties of α-quartz type GeO2 were studied ia lattice energy minimization calculations using shell model and Buckingham potential.
A Knudsen-cell mass spectrometric technique was used to study a composition of saturated vapour over terbium and thulium trichlorides. For the first time the various neutral (LnCl 3 ) n and charged Cl - (LnCl 3 ) n (Ln = Tb, Tm, n = 1-8) species have been found in the temperature range between 900 and 1100 K. The part…
Polymerization of butene-1 (B-1) was carried out with a PP-TiCl3/Et2AlCl/methyl methacrylate (MMA) catalyst system in n-heptane. The influence of temperature, pressure, time and H2 on molecular weight, isotacticity, and catalytic activity were studied by viscometry, solubility in boiling diethyl ether, and measuring t…
An important parameter for the insulation capability of rigid polyurethane foam is the thermal conductivity of the nonporous polyurethane. This work focuses on ways to produce nonporous polyurethane materials and to determine their thermal conductivity. Additionally, the influence of the dissolved blowing agent, the f…
Nanomedicine is the medical application of nanotechnology. Nanomedicine is defined as the monitoring, repair, construction and control of human biological systems at the molecular level, using engineered nanodevices and nanostructures. Nanomedicine ranges from the medical applications of nanomaterials to nanoelectroni…
Phase stability and mechanical properties of Ti-Zr based alloys containing Nb as β stabilizer were investigated. Phase stability of annealed and quenched alloys with various Nb concentration were examined by optical microscopy and X-ray diffractometry while mechanical properties of the alloys were evaluated by hardnes…