Materials Literature
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The kinetics of nucleation and crystal growth in a Li 2 B 4 O 7 glass were investigated using differential thermal analysis (DTA) and differential scanning calorimetry (DSC). This melt forms a glass even when it is cooled at a very slow rate (2 K/min). The temperature range of nucleation was determined by comparing th…
This paper describes the development of a novel shape memory alloy (SMA) actuator with high frequency responses. By applying Peltier modules as heat pumps for heating and cooling of SMAs, the actuator is expected to have higher frequency responses comparing with conventional ones. Thermomechanical properties of the ac…
Amphiboles were synthesized at 1.5 kbar P H₂O and 850 °C along the join pargasite-fluoropargasite. Structural variations in the amphibole as a function of F have been characterized by a combination of SEM-EDS, X-ray powder diffraction, and infrared spectroscopy. SEM-EDS analyses show that, for increasing F in the syst…
Abstract The ac magnetic measurements on an organic metal, κ-(BETS)2FeCl4 down to 60 mK revealed successive antiferromagnetic and superconducting phase transitions at about 0.65 K (≈TN) and 0.1 K (≈TC), respectively. These transitions correspond to the similar transitions in the Br-analogue, κ-(BETS)2FeBr4 but the tra…
In magnetic systems, electromagnetic force density distribution may cause mechanical deformation, which results in the mechanical noise and vibration. The electromagnetic force density can be analyzed with several techniques such as stress tensors, equivalent magnetization models and energy approaches and etc. that ma…
The equations of motions for the medium with an icosahedral qusicrystalline symmetry are generalized. It is shown that phonon-phason coupling in an icosahedral quasicrystal leads to the dependence of the acoustic phonons velocity and the attenuation coefficient on the propagation direction in a temperature region clos…
The association of ethionamide with different colloidal systems was evaluated. Nanocapsules (NC), nanospheres (NS), and nanoemulsions (NE) were prepared by interfacial deposition and spontaneous emulsification techniques. Ethionamide was incorporated before (B) and after (A) preparation of nanoparticles. Ethionamide w…
Wavelength normalization is an essential part of processing of Laue X-ray diffraction data and is critically important for deriving accurate structure-factor amplitudes. The results of wavelength normalization for Laue data obtained in nanosecond time-resolved experiments at the ID09 beamline at the European Synchrotr…
The HMQC-TOCSY 3D NMR technique has been used to study the DAB-16 [poly(propyleneimine)] dendrimer (the third generation) on a 750 MHz spectrometer. In the HMQC-TOCSY 3D NMR spectrum, it is possible to disperse 1 H signals based on the well-resolved 13 C chemical shifts and to obtain both one-bond 1 H− 13 C connectivi…
The aim of the present work was to evaluate the disinfectant capacity and the possible fields of application of a combined silver and hydrogen peroxide (HP) water disinfectant. The findings demonstrated the high bactericidal action of silver (on E. coli) and its relatively ineffective virucidal effect (on MS-2 phage).…
Reverse mode operation shutters have been achieved with polymer dispersed liquid crystals by means of polymerization-induced phase separation of nematic mixtures consisting of a low molecular mass liquid crystal and a liquid crystalline monomer. Fluid mixtures were homeotropically aligned by rough surfaces and transpa…
Recently developed dynamic step-scan FT-IR spectroscopy combined with software-based digital signal processing (DSP) was applied for infrared rheo-optical measurements of isotactic polypropylene and regenerated Bombyx mori silk fibroin film undergoing sinusoidal mechanical strain. Comparative measurements of dynamic i…
Green state joining of SiC was investigated using a paste consisting of polycarbosilane polymer and SiC powder. The joining process and densification were described. Initial experiments resulted in the formation of symmetrical black bands and cracks on both sides of the joint. However, with modifications in processing…
A versatile approach to a new family of radially layered copolymeric poly(amidoamine−organosilicon) (PAMAMOS) dendrimers containing hydrophilic polyamidoamine (PAMAM) interiors and hydrophobic organosilicon (OS) exteriors is described. The synthesis involves either Michael addition of organosilicon acrylates or methac…
In this paper the equivalent sources methods, written in terms both of the actual and of the external field, are used for the computation of the total force in two-dimensional axisymmetric problems. A Finite Element modeling of the magnetizing currents as field sources is presented in order to improve the formulations…
Vector hysteresis models are applied to an eddy-current analysis. The vector hysteresis models are composed by play hysterons and stop hysterons. The eddy-current analysis shows that both play and stop hysteron models can effectively describe isotropic vector hysteretic behavior. The stop hysteron model is more effici…
Solution-grown lamellar single crystals of bacterial poly[( R )-3-hydroxyvalerate] (P([ R ]-3HV)) have been prepared in a mixture of chloroform and methanol. P([ R ]-3HV) crystals were square-shaped and gave well-resolved electron diffraction diagrams from which the reciprocal lattice parameters a* = 1.052 nm -1, b* =…
The effects of xylenes/ethanol solvent mixtures on lanthanum‐modified lead zirconate titanate (PLZT) nonaqueous suspensions were investigated by measuring sediment height, viscosity, and adsorption of dispersant. Well‐dispersed colloidal suspensions were obtained in xylene‐rich solvents with a minimum amount of menhad…
The ageing of HDPE/cellulosic fiber composite exposed to drastic weather and the percentages of cellulosic fibers are responsible for some changes in the crystallinity of component matrix (HDPE). Two types of samples have been evaluated during different periods of time (up to 90 days). One in which cellulosic fibers h…
Micromechanical deformation mechanisms of two slightly branched polyethylenes have been studied by transmission electron microscopy and scanning force microscopy. Using an ethylene/hexene copolymer the transformation of the lamellar structure in the oriented structure inside a notch-tip craze and using a binary blend…