In this work, magnesium borate (Mg2B2O5) and aluminum (Al18B4O33) whiskers with a high aspect ratio were successfully synthesized using molten salt method. The phase transformation morphology involution of the studied by XRD, IR-FT, TG-DSC, SEM-EDS different boron/metal ratios reaction temperatures. results show rich boron environment appropriate temperature to be crucial factors respect compos...

Abstract Based on the coprecipitation of FeSO 4 (NH ) 2 SO with CuCl and ZnSO , CuFe O ZnFe nanocrystals were successfully synthesized. The morphology crystal structures nanoparticles studied via SEM, TEM XRD, which showed that MFe samples formed aggregated sizes 16 ? 20 nm a narrow dispersion in size. had typical spinel structures. Magnetic analyses demonstrated sample saturation magnetization...

This paper examines the hypothesis that the persistence of low spatial and marital mobility in rural India, despite increased growth rates and rising inequality in recent years, is due to the existence of sub-caste networks that provide mutual insurance to their members. Unique panel data providing information on caste loans and sub-caste identification are used to show that households that out...

A nowhere-zero 3-flow in a graph G is an assignment of a direction and a value of 1 or 2 to each edge of G such that, for each vertex v in G, the sum of the values of the edges with tail v equals the sum of the values of the edges with head v. Motivated by results about the region coloring of planar graphs, Tutte conjectured in 1966 that every 4-edge-connected graph has a nowhere-zero 3-flow. T...