Materials Literature
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Nickel Titanium alloys are a unique class of materials which exhibit shape memory and superelastic properties. The interest in this material for medical applications, such as surgical implants, has been steadily growing in recent years. In the present study, NiTi (55%Ni-45%Ti) SMA were surface alloyed with molybdenum…
The processes of charging of a natural diamond crystal irradiated by an electron beam with primary electron energies in the range 1–30 keV have been experimentally investigated. The charging kinetics has been studied as a function of the irradiation dose and the electron-emission properties of the crystal. The followi…
Effect of deformation temperature on subsequent recrystallization characteristics of commercial purity titanium (CP-Ti) was investigated using EBSD and transmission electron microscopy. CP-Ti plates were rolled to at various temperatures between 25°C and 600°C to achieve 60% reduction, and were subsequently annealed a…
Effects of Yb2O3fine dopant (16 nm) on the acoustic properties of a high-temperature-vulcanization (HTV) silicone rubber have been investigated, in order to develop a new acoustic lens material with a low acoustic attenuation (alpha) for the medical array probe application. The HTV silicone rubber has advantages in th…
The microstructures in 3 mol% Y2O3-stabilized tetragonal zirconia polycrystal (Y-TZP) sintered at 1100°-1650°C were investigated to clarify cubic-formation and grain-growth mechanisms. The cubic phase in Y-TZP appeared at 1300°C and its mass fraction increased with increasing sintering temperature. High-resolution tra…
It is now well-established that processing through the application of severe plastic deformation (SPD) leads to a significant reduction in the grain size of a wide range of metallic materials. This paper examines the fabrication of ultrafine-grained materials using high-pressure torsion (HPT) where this process is att…
The effects of alloying elements and impurities on the microstructure and properties of metals and alloys are important. Understanding of these effects may help to control and produce products with desired properties at lower cost. In the present work the effects of Al, Si and Mn on the recrystallization behavior, har…
Adiabatic calorimetry is used to measure the low-temperature heat capacity of Na2Er(MoO4)(PO4)from 6.41 to 347.87 K. Experimental data are used to calculate the thermodynamic functions of Na2Er(MoO4)(PO4), which at 298.15 K are as follows: C p 0 (298.15 K) = 243,3 ± 0.4 J/(K mol), S 0(298.15 K) = 312.8 ± 0.8 J/(K mol)…
Procedures have been developed for growing TlInSe 2 , TlInTe 2 , and TlGaTe 2 single crystals. Float zoning has been shown to be the most effective process for the crystal growth of these compounds. The grown single crystals exhibit a sizeable acoustophotovoltaic effect.
In order to understand the capability of vanadium panels and membranes for fuel particle pumping at relatively low temperatures, absorption of neutral hydrogen atoms by vanadium sheet was examined at/below 350°C under wide variety of experimental conditions. A niobium sheet kept at high temperature (420 °C) was used a…
The main objective of the study was to find a relationship between the structure and lipophilicity of metalloporphyrins with Zn(II), Cu(II), and Ni(II) cations. Specifically, the studies concern calculation of dipole moments, distribution of excess atomic charge within the molecules, and numerical values of bond lengt…
In view of the high piezoelectric activity found on some cellular polymer electret films, polymeric space-charge electrets were studied more frequently during the last ten years. An alternative concept -between cellular electret materials and devices with non-porous electret films -are layer systems of porous and non-…
Damage to the surface layer of cotton fibers was observed. Cotton fibers were transformed to yarns in the classical and open-end spinning systems. Damage was observed using a scanning electron microscope JSM-5500LV f-my Jeol. The samples were chosen from the initial and final stages of the technological process. Seven…
Mesoporus silica dielectrics, which revealed low refractive index (n~1.27), were introduced together with Si3N4layers to be double-layer-based graded-refractive-index ant-reflectors for silicon solar-cells. Enhanced solar-light transmission increased conversion efficiency of Si solar panels by 2%.
Molecular dynamics simulation was used to analyze changes in the functionally significant structural elements of the crystal lattices of pT160-CDK2/cyclin and A/ATP-Mg 2+ /substrate complexes of the native (CDK2-G16) and mutant (CDK2-S16) active kinases at physiological temperatures (300 K). The structural rearrangeme…
This paper reports on the experimental results of investigations into the influence of the thermal prehistory of the sample on the height of the peak in the light scattering intensity after temperature jumps in the glass transition range of the STK-3 optical silicate glass. It is demonstrated that, as for germanate an…
This paper reports on the results of investigations into the radiation stability of tin charge states in the (As2Se3)1−z (SnSe) z − x (GeSe) x glasses. It is revealed using 119Sn Mössbauer spectroscopy that gamma irradiation of the (As2Se3)1−z (SnSe) z − x (GeSe) x glasses leads to partial oxidation of doubly charged…
The synthesis of a series of low-molecular-weight chitosans and the results of their bioassay against several phytopathogenic fungi are described.
Dye molecules doped polythiophene (PT) films prepared by electrochemical doping were investigated by Fourier transform infrared spectroscopy (FTIR) reflection absorption spectroscopy (RAS) and transmission in order to investigate whether the presence of an electric field could control the ordering of the dye molecule…
The relaxation behavior of the domain structure of a Rochelle salt crystal during its repolarization by a static electric field was studied over a wide temperature range (from −18 to +24°C). The field and temperature dependences of the relaxation time are found. It is shown that the difference between the activation e…