Materials Literature
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Poly (3-hexylthiophene) (P3HT) synthesized by oxidative polymerization was fractionated by molecular weight by using organic solvents. The fraction of higher average molecular weight gave higher regioregularity and conductivity. Composites of the P3HT fraction having the highest molecular weight were prepared by use o…
The kinetics of hydrogen-induced disproportionation of Zr2Co was studied by the conventional constant volume method in a temperature range of 773 to 873 K. It was found that Zr2Co disproportionated as 2Zr2Co+3H2 → 3ZrH2+ZrCo2 through a two-step mechanism as 1) Zr2Co+H2 → ZrH2+ZrCo and 2) 2ZrCo+H2 → ZrH2+ZrCo2. The fir…
A new version of an energy-loss spectrometer with low-energy electron diffraction (ELS–LEED, Henzler type EELS) has been constructed. Different from the prototype spectrometer, which is equipped with a single-pass 127° cylindrical deflector analyser, the present spectrometer consists of an Ibach-type double-pass monoc…
Cavitation bubbles are formed from small air bubbles, so-called nuclei, with the surrounding pressure reduction caused by the flow, and then, the bubbles shrink and collapse with the surrounding pressure rise. Such volumetric changes of bubbles are calculated in detail and it is found that they are significantly influ…
In order to develop a new type of lactic acid copolymer having pendant reactive groups as a biodegradable biomaterial, the synthesis of an AB-type diblock copolymer of L-lactide (L-LA) and depsipeptide with pendant thiol groups was investigated. Cyclodepsipeptide consisting of glycolic acid (Glc) and β-methoxybenzyl L…
Series of perovskite oxides with the composition LaMn1 − xMxO3 + δ (M = Cr, Co; 0 ≤ x ≤ 1) have been synthesized by thermal treatment of precursors obtained by freeze-drying of acetic acid solutions. The oxides have been characterized by X-ray diffraction, and the Mn4+ content and, thus, the oxygen excess, δ, has been…
A review of various models for predicting the water permeability of fibrous structures is reported. Using the Hagen–Poiseuille formula, a modified form of the Kozeny–Carman equation was derived. An apparatus was constructed that enabled cross-plane and in-plane water permeabilities of various needle-punched nonwoven f…
Polarized Raman spectra of single crystals of barium copper formate [Ba2Cu(HCOO)6] at room temperature were recorded and analysed. The spectra were obtained for geometries allowing the observation of A(TO) and BTO + LO) species. The assignment of the fundamental modes was performed on the basis of formate group vibrat…
The MNDO/PM3 semiempirical method was used for predicting nonplanar distortion modes in highly substituted porphyrins. Octaethyl-tetraphenylporphyrin (MOETPP) and dodecaphenylporphyrin (MDPP) (M = H2, Mg and Zn) were obtained as minimum energy structures and exist in saddle-shape conformations. Optimized meso-substitu…
Synthetic buckhornite, [Pb 2 BiS 3 ][AuTe 2 ], was grown from melts in connection with the search for high-temperature superconductive materials. Chemical analyses were performed by electron-microprobe investigations. The crystal structure was determined from 726 single-crystal X-ray reflections of a twinned crystal.…
The application of optical encoders in Charpy impact energy measurement has improved significantly the accuracy of “dial energy” determination. Instrumented strikers offer an alternative method of energy measurement which is accurate and reproducible for both conventional and miniature specimen testing while providing…
Promoted ignition, and more recently, promoted combustion are terms which have been used to describe a situation where a substance with low oxygen compatibility ignites and promotes the combustion of a more combustion resistant material. The literature in recent years has been enriched by studies of this phenomenon as…
Since the development of Nickel-Metal Hydride (NiMH) batteries in the late eighties of the previous century, these batteries have become widely accepted in our present-day portable society. In the very early days of the current century this battery type has become even more popular in portable electronics than any oth…
The paper describes the compilation and maintenance of a database on nuclear fuel performance for the purpose of code development and validation. This work is carried out in close cooperation and coordination between the OECD/NEA, the IAEA and the IFE/OECD/Halden Reactor Project. The paper outlines the background behi…
This paper reports on the development of an improved pulsed electro-acoustic (PEA) system to measure the space charge characteristics in the bulk of polyethylene insulation subjected to an applied voltage with a range of frequencies from zero to 100 Hz. The system enables multiple measurements to be taken at various p…
The magnetization properties of grain-oriented silicon steel sheets under bending stress are not a simple combination of the properties due to tensile stress on the convex side and compressive stress on the concave side. Domain structures on both sides are different from the structure of independent stress of tension…
Spectral and fluorescent properties of ketocyanine dyes (polyenic bis‐ ω , ω ′ ‐aminoketones) and cation‐anionic polymethine dyes of various structures were studied. The symmetric ketocyanines were shown to have a long‐wavelength absorption band bathochromically shifted in comparison with that of the asymmetric ketocy…
Ionic and non-ionic liquid crystalline polymethacrylates were synthesized, and their thermal and liquid crystalline properties were compared. Both the ionic and non-ionic liquid crystalline polymethacrylates exhibited a thermotropic smectic A phase. An isotropization temperature of the ionic liquid crystalline polymet…
Crystallization of a series of liquid crystalline copolyesters prepared from p-hydroxybenzoic acid (HBA), hydroquinone (HQ), terephthalic acid (TA), and poly(ethylene terephthalate) (PET) was investigated by using differential scanning calorimetry (DSC). It was found that these copolyesters are more crystalline than c…
Solubility proves to be a major hurdle for the successful development and commercialization of new drug products. Since 40% of the active substances being identified through the new paradigm in high – throughput screening are lipophilic. So, its viability as a potential new drug candidate reduces manifold. Becau…