STUDY OF PESO - PHO Y OF PESO - PHOTORESISTIVE CH ORESISTIVE CHARACTERISTICS OF TERISTICS OF TlInSe2 SINGLE CRYSTALS

Objective. The aim of the study is to establish the patterns and mechanisms of the effect of various impurities on the tensoresistive characteristics of TlInSe2 single crystals, as well as in solid solutions based on it. When studying the piezophotoresistive characteristics of TlInSe2 single crystals, it will determine the nature of the effect of uniaxial elastic deformation on the electrical, photoelectric and tensoresistive properties of TlInSe2 crystals. Methods. Crystals synthesized by fusing the components in accordance with stoichiometry in evacuated (~ 10-4 mm Hg) and sealed quartz ampoules were used for the study. Highly pure elements thallium (Tl - 000), indium (In - 000) and selenium (Se - high purity grade - 17 - 4) were used as initial components for the synthesis. Single crystals were grown by the improved Bridgman method, the crystallization front velocity varied from 0.5 to 0.9 mm / h. The samples required for the study were prepared by cleaving the grown single crystals from an ingot by the simplest indentation with a sharp knife, the blade thickness of which is ≤ 0.01 mm, along two mutually perpendicular planes of natural cleavage.

Research on Using AlMg10-SiC Cellular Alloys for Fluids Filtering

The paper presents some aspects of theoretical-experimental researches on the possibility of obtaining filters from a cellular metallic composite, based on theoretical considerations and practical aspects of the fluid environment, filter elements and the specific equipment that can accommodate this kind of filter. Thus, development of such new and performant filtering technologies, based on multifunctional materials, is currently conditioned by the design and development of cellular structures, with properties adapted to the filtering and functioning demands, structures that can reach operating temperatures between 150 and 2000oC. It was examined the possibility of obtaining alloys with cellular structure directly from casting process, alloys with high porosity, adjustable size and distribution of pores and high thermo-mechanical properties, which can be adapted for applications in the field of fluids filtration at temperatures above 100°C, fluids which can be chemically corrosive. The AlMg10-15% SiC cellular composite was obtained by means of melt bubbling method. We chose this type of material due to its achieved overall morphology: pores are uniform distributed throughout the mass of the material and they are connected through communication channels in the entire volume of the metallic composite. Through the conducted filtration tests we obtain the following values: filter fineness 97 μm, filtering capacity β97 = 8 and filtration efficiency E97 = 87.5 %. In accordance with determined filtering characteristics, the cellular metallic composite AlMg10-15% SiC belongs to the filters materials class that ensure a purity of the filtered fluid corresponding to a purity grade 6, in accordance with NAS 1638 and ISO 4406-1999.

ATI 6-4ELI

ATI 6-4 ELI, also known as Grade 23, is a higher purity grade of ATI Ti-6Al-4V for use in surgical and medical applications. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: Ti-159. Producer or source: Allegheny Technologies Inc..

A novel β-galactosidase from Arthrobacter sulfonivorans: purification, characterization and gene cloning

Process schemes yielding β-galactosidase of different purity grade were designed, the enzyme properties were determined. It was the first isolation and investigation of the gene encoding Arthrobacter sulfonivorans extracellular β-galactosidase.

Structural and Thermoelectric Properties of Zn-Doped Cuprous Aluminate Delafossite

The polycrystalline Zn-doped CuAlO2 ceramics were obtained by solid state reaction method. The mixture of high purity grade of CuO, Al2O3 and Zn (CH3COO)22H2O powders was ground and then pressed by using uniaxial pressure. The obtained pellet was sintered in air at 1,150 °C for 24 h. XRD patterns showed the crystal structure of the as-sintered CuAl1-xZnxO2 (0x0.05) belonging to rhombohedral, space groupalong with the CuO and CuAl2O4 phases. From SEM micrographs, the grain size slightly decreases when the amount of Zn in CuAl1-xZnxO2 samples increases. Hall mobility and hole concentration of the as-sintered samples were obtained from Hall effect measurements in van der Pauw configuration at room temperature. The electrical resistivity measurements as a function of temperature were performed. The variation of Seebeck coefficient and power factor as a function of temperature was also investigated. In the present study, the Zn-doped CuAlO2 ceramics probably have advantages for use in high temperature thermoelectric devices.