Materials Literature
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Hydrophilic nanoparticulate carriers have important potential applications for the administration of therapeutic molecules. The recently developed hydrophobic-hydrophilic carriers require the use of organic solvents for their preparation and have a limited protein-loading capacity. To address these limitations a new a…
Thermoluminescence (TL) characteristics of BaSO4:Eu Teflon discs (punched out from BaSO4:Eu Teflon sheet received from Nemoto and Co. Ltd., Japan) were compared with CaSO4:Dy Teflon discs (BARC make) of similar dimensions. The TL sensitivity of BaSO4:Eu discs was 5.8 and 11.0 times that of the CaSO4:Dy disc when they…
The equilibrium conditions impose nontrivial geometrical constraints on the configurations that a two-dimensional foam can attain. In the first place, the three centers of the films that converge to a vertex have to be on a line, i.e. all vertices are aligned. Moreover an equilibrated foam must admit a reciprocal figu…
The design of optical coatings is the commonly accepted term which meaning is quite unambiguous. On the contrary the term reverse engineering is often taken variously. The meaning of this term in the following is the determination of optical parameters and thicknesses of layers of manufactured optical coatings from th…
An analytic theory proposed in Ref. 1 [V. S. Sukhomlinov and É. N. Fafurina, Zh. Tekh. Fiz 65 (4), 9 (1995); Tech. Phys. 40 , 295 (1995)] for the backscattering of light ions by a solid surface is developed for the cases of multicomponent materials and materials in which the concentrations of some of its components va…
This paper presents experimental and theoretical results from an investigation of the excitation and propagation of converging pressure waves in cylindrical shells made of polymethyl methacrylate (PMMA) producing spalling phenomena in the inner surface of the shell. It is found that fracture of the inner surface of a…
Although the current workhorse in the area of second-order nonlinear optical (NLO) materials is still the inorganic NLO crystals, organic NLO crystals have their own bright aspects such as the high molecular NLO coefficient and structural diversity and flexibility. In principle, there is no distinct boundary between i…
The dimensionality effect of carbon materials is discussed relating to the topological extension of graphite sp2 network and the resultant π electronic structure. Introducing the polygonal defects into a graphite network, we can construct from zero-dimensional fullerene molecules to three-dimensional spongy structures…
Outdoor air insulated, high voltage transmission and distribution networks are frequently exposed to atmospheric pollution in the form of sand and dust storms which can affect the breakdown and prebreakdown characteristics and insulation performance of air gaps. This paper summarizes the findingks of an extensive stud…
Hanseniella colombiana n.sp.possède, comme H. ivorensis Juberthie-Jupeau et Kehe, 1978, une paire de macrochètes aux tcrgitcs II, III, IV, VI, Vil et IX.Hile diffère de H. ivorensis par les caractères des antennes, des pattes et des Filières, mais présente comme cette dernière des caractères sexuels secon¬ daires port…
In the previous papers it was shown that the mechanical properties of spider threads taken from Nephila clavata called Jorougumo in Japan were excellent and thus the threads were expected to be one of the most useful materials in future, if produced in large quantities. In this paper, the analyses of composition and c…
An analytic solution for the kinetics of nonlinear (upconversion) luminescence quenching in solid- state laser materials and other luminophosphors is obtained under the assumptions of hopping character of migration- assisted energy transfer and finite excitation life-time. It is shown how the observables of the lumine…
The tensile properties of a commercially available, random continuousfiber thermoplastic composite material are investigated at various strain rates and elevated temperatures. The material utilizes polypropylene (PP) for the matrix material, with random continuous E-glass fiber reinforcement. Tensile modulus, tensile…
Currently, long-circulating pharmaceuticals and pharmaceutical carriers represent a huge and still fast growing area of biomedical research. The critical evaluation of the state-of-the art, long-circulating drugs and drug carriers, reviews and discussions on the current approaches and strategies in the design and prac…
Diffusion coefficients (D) of blowing agents and air in cellular plastic insulation are the key parameters in determining the thermal quality and dimensional stability of the foams. Measurement methods available for this purpose are briefly discussed. An apparatus based on the so called diffusion chamber method has be…
The application of sulfur-nitrogen free-radicals as molecular ‘bricks’ for the construction of novel magnetic materials is described and exemplified by the dithiadiazolyl radical, which becomes weakly ferromagnetic at 36K.
Magnetic and mechanical properties have been investigated in Fe-4 to 7.8 wt% Si rapidly quenched and annealed ribbons. The roles played by composition and microstructure on the magnetic energy losses and the tensile stress-strain behavior have been put in evidence, by carrying out the related experiments as a function…
The microstructure of Ni-YSZ anode was investigated in terms of the suppression of Ni sintering. The spray pyrolysis method was applied for synthesis of the NiO-YSZ composite powder. The morphology of obtained powder consisted of die fine YSZ particles dispersed on the surface of NiO particles. It was observed that on…
The reaction mechanism of oxygen electrode has been studied by impedance spectroscopy in order to improve the performance of a solid oxide fuel cell. Reproducible impedance spectra was confirmed by using the improved cell, consisting of a thin YSZ disk and sintered platinum electrodes. The spectra measured for an O 2…
To obtain efficient humidity regulation effects in buildings, development of porous materials impregnated with chlorides was attempted. In a series of experiments, two types of calcium silicate boards and three types of building stones were used as base materials. For impregnated chemicals not only lithium chloride wh…