Materials Literature
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The effect of palm oil fatty acid (POFA) and stearic acid on dynamic properties, curing characteristics and mechanical properties of natural rubber (SMR L) and epoxidized natural rubber (ENR 50) was investigated in the concentration range of 1 to 7 phr. Results indicate that scorch time, t 2 , cure time, t 90 and maxi…
The properties of a new domain structure, the equilibrium hexagonal lattice of spiral domains in ferrimagnetic films with perpendicular anisotropy were experimentally studied. The intervals of the bias fields and temperatures under which the lattice can be formed are determined. Temperature and field intervals of spir…
A time-dependent gas-phase isovolumetric desorption technique has been used to assess the isotope effects in the diffusive transport parameters of hydrogen in an 8% CrWVTa reduced activation martensitic steel in the temperature range of 423–892 K and driving pressures from 4 × 104–105 Pa. The experiments have been run…
Two new occurrences of anduoite, (Ru,Os)As2, a rare platinum-group mineral (PGM), are reported from chromitites, one from the Kapitanov deposit, Ukrainian Shield, Ukraine, and the other from the Maja e Sukes deposit, Tropoja ophiolitic massif, Albania. At Kapitanov, anduoite occurs as discrete, homogeneous, euhedral c…
Streszcz. ang.
The kinetics of thermal shrinkage of poly(ethylene terephthalate) films have been characterized and related to various parameters of the stretching process. Amorphous orientation functions and levels of crystallinity have been found to be of major importance to the shrinkage process. As film extension ratios increase,…
We present a detailed magnetothermal study of Pr0.7Ca0.3MnO3, a perovskite manganite in which an insulator-metal transition can be driven by magnetic field but also by pressure, visible light, X-rays or high currents. We find that the field-induced transition is associated with a large release of energy which accounts…
The energies of unoccupied and occupied orbitals were used as the correlation parameters between the electronic and adsorptive properties of organic molecules. A model describing the chemisorption of organic compounds on CaCO 3 involving two types of interaction, i.e. two-electron, donor–acceptor interaction HOMO(adso…
Two very useful, versatile reactions applicable to the synthesis of TTF-type electron donors are presented: the one-pot preparation of 1,3-dichalcogenole-2-chalcogenones from readily available terminal alkynes and the ready formation of heterocyclic rings fused on TTF by transalkylation on a chalcogen atom. These reac…
Measurements of elastic waves brought by a pulse of simulated corona discharge in an oil immersed pole transformer and a model tank filled with oil were performed in order to identify the location of insulation deterioration, using an acoustic emission (AE) technique. The detected AE signals were analyzed by means of…
Natural rubber (NR)/Linear low density polyethylene (LLDPE) blends were prepared using an internal mixer at 150°C and a rotor speed of 55 rpm. The tensile strength, tensile modulus and hardness increase with increasing LLDPE content whereas elongation at break and mass swell show decreasing trend. With 30/70 (W/W) NR/…
We study non-equilibrium velocity fluctuations in a model for the sedimentation of non-Brownian particles experiencing long-range hydrodynamic interactions. The complex behavior of these fluctuations, the outcome of the collective dynamics of the particles, exhibits many of the features observed in sedimentation exper…
In this paper we show the possibility of regulating the dose of the anchoring energy under the control of the incident light. Using a dye-doped nematic sample where it was previously demonstrated the effect of light-induced anchoring, we measured the threshold for the Fred-ericksz transition for different irradiation…
Some of the basic mechanical characteristics such as tensile, bending, shear, compression, and surface properties of cotton knitted fabrics after a durable flame‐retardant finishing, were studied by the objective‐evaluation method developed by Kawabata and Niva using the KES‐F system. In addition, properties such as b…
Abstract High‐performance surfactants have been developed for the preparation of water‐in‐oil high internal phase emulsions (HIPE), particularly for the preparation of polymerized HIPE foams. High‐efficiency surfactants with poly(butylene oxide)/poly(ethylene oxide) (BO/EO) block copolymer backbones have been develope…
We have studied interfacial forces in MBBA, 5CB, 8CB and 12CB liquid crystals on DMOAP silanated glass substrates using a temperature controlled AFM in the force spectroscopy mode. In the bulk isotropic phase all these interfaces are clearly divided into two regions. The first molecular layer, which is absorbed to the…
The synthesis of solid solutions of AlN–SiC was investigated through the combustion reaction between Si 3 N 4 , aluminum, and carbon powders and nitrogen gas at pressures ranging from 0.1 to 6.0 MPa. The combustion reaction was initiated locally and then the wave front propagated spontaneously, passing through the cyl…
The deviations of the jet of a shaped charge or of the rod of a KE-round by the flying plates of an Explosive Reactive Armour (ERA) are described by a simple momentum equation. This continuous consideration does not describe the non permanent event at all, as the plates pulsate or act iteratively especially against sh…
Abstract A liquid crystal polymer (LCP) was blended polethylene terephthalate (PET) in different concetrations to improve the barrier properties of PET in injection stretch blow molded bottles. The improvement depends on the microstructure developed at various stages of the process.In this work, the emphasis is on the…
Bei der Umsetzung von CeCl3 mit CeO2, Cer und SiO2 bzw. P2O5 im molaren Verhältnis von 5 : 3 : 1 : 3 bzw. 8 : 3 : 1 : 2 in evakuierten Quarzglasampullen (7 d, 850 °C) fallen Ce3Cl5[SiO4] (orthorhombisch, Pnma; a = 1619,7(2), b = 415,26(4), 1423,6(1) pm; Z = 4) bzw. Ce3Cl6[PO4] (hexagonal, P63/m; a = 1246,36(9), c = 40…