A series of isovalently A-site substituted relaxor dielectric tetragonal tungsten bronzes of general formula Ba(6-x-y)Sr(x)Ca(y)GaNb(9)O(30) were investigated. The long-range (average) crystal structure as determined by conventional diffraction techniques varies monotonically according to Vegard's law. The dielectric properties, however, do not display a similar, simple "average size" dependenc...

BACKGROUND Current surgical outcomes of congenital heart surgery for patients with Down syndrome are unclear.Methods and Results:Of 29,087 operations between 2008 and 2012 registered in the Japan Congenital Cardiovascular Surgery Database (JCCVSD), 2,651 were carried out for patients with Down syndrome (9%). Of those, 5 major biventricular repair procedures [ventricular septal defect repair (n=...

Every level of analysis of biological factors from molecular genetics, to brain structure and function, to neuropsychological performance has found links between biology and antisocial behavior. Likewise, a number of social or environmental factors maltreatment, socioeconomic status, education, and so on are believed to contribute to crime and aggression. Over the past two decades, increasing i...

C. Buttersack and K. Buchholz Institut für landwirtschaftliche Technologie und Zuckerindustrie an der TU Braunschweig, TU Braunschweig, Langer Kamp 5, D-38106 Braunschweig, Bundesrepublik Deutschland Z. Naturforsch. 49c, 258-264 (1994); received December 2,1993 Diffusion, Sucrose, Water, Aqueous Solution The self diffusion coefficients D of the water molecules and of sucrose have been deter­ mi...

An exact solution of a Landau model of an order-disorder transition with activated critical dynamics is presented. The model describes a funnel-shaped topology of the order parameter space in which the number of energy lowering trajectories rapidly diminishes as the ordered ground state is approached. This leads to an asymmetry in the effective transition rates which results in a nonexponential...

Formative assessment was first used by Scriven (1967), but studies focused on formative assessment in ESL and EFL classes started in 2000. Formative assessment is integrated in learning and teaching, so a great part of classroom assessment is formative. However, classroom assessment has been not defined clearly, as most of the texts about this type of assessment define it in terms of its format...

We obtain exact results for the effective diffusion constant of a two dimensional Langevin tracer particle in the force field generated by charged point scatterers with quenched positions. We show that if the point scatterers have a screened Coulomb (Yukawa) potential and are uniformly and independently distributed then the effective diffusion constant obeys the Volgel-Fulcher-Tammann law where...