In this study, the effects of aging times and temperatures on microstructure, hardness compression strength Al0.7CoCrFeNi high entropy alloy have been investigated. The was cast in a vacuum induction melting furnace, homogenized at 1250 ˚C for 6 h; then aged 700 to 1000˚C 2-8 h. as-cast structure is dendritic includes FCC(A1) BCC(A2, B2) phases with 497 HV. During ageing, B2 precipitates grain ...

this study aims to evaluate effects of two downscaling methods; change-factor and statistical downscaling on therunoff of the azam-harat river located at yazd province (with an arid climate) of iran, under the a2 emission scenariofor the period of 2010-2039. for this purpose, cgcm3-ar4 model; a rainfall-runoff conceptual model, ihacres; twodownscaling models, change factor and lars-wg were appl...

Bleomycins, a group of glycopeptide antibiotics differ from one another in their terminal amine moieties. 14C-Methyl-labeled 3-aminopropyl-dimethylsulfonium was confirmed to be incorporated into the amine moiety of bleomycin A2. Addition of amines of bleomycin A2, A2'-a, A2'-b, A2'-c, A5, B2 and B4 to fermentation media increased the rate of production of the bleomycin which contained the added...

Let X be an n–element finite set, 0 < k ≤ n/2 an integer. Suppose that {A1, A2} and {B1, B2} are pairs of disjoint k-element subsets of X (that is, |A1| = |B1| = |A2| = |B2| = k,A1 ∩ A2 = ∅, B1 ∩ B2 = ∅). Define the distance of these pairs by d({A1, A2}, {B1, B2}) = min{|A1 − B1| + |A2 − B2|, |A1 −B2|+ |A2 −B1|}. Let C(n, k, d) be the maximum size of a family of pairs of disjoint subsets, such ...

Suppose a, b, c, and d are rational numbers such that a2, b2, c2, and d2 form an arithmetic progression: the differences b2−a2, c2−b2, and d2−c2 are equal. One possibility is that the arithmetic progression is constant: a2, a2, a2, a2. Are there arithmetic progressions of four rational squares which are not constant? This question was first raised by Fermat in 1640. There are no such progressio...

En este trabajo se presentan los resultados del análisis de un corpus compuesto 30 producciones escritas realizadas por aprendices adultos hispanohablantes ruso como LE. El objetivo es identificar errores ortográficos y sus causas en el nivel B2, así comparar número total que comenten dos grupos diferentes niveles – A2 B2. ha reflejado más frecuentes son sustitución las consonantes б-в [b]-[v],...

The enzyme, esterase B2, involved in insecticide resistance has been purified and characterized from the mosquito Culex quinquefasciatus. The monomeric enzyme has an M(r) of 62000 and a pI of 5.0. This enzyme is compared with the esterase A2 previously characterized [Ketterman, Jayawardena and Hemingway (1992) Biochem. J. 287, 355-360]. The kinetic constants for interaction with several insecti...

The time-temperature transformation behavior of a rapidly solidified (RS) Ti-24Al-11Nb alloy has been studied between 450 and 850 “C using X-ray diffraction, electron diffraction, transmission electron microscopy and microindentation methods. A revised isothermal transformation path from the initial B2 to the final cz? structure has been proposed: B2 (Pmjm)B19 (Pmma)-0’ (Cmcm) 0’ (Cmcm) a2 (P6,...