Anomalous relaxations and chemical trends at III-V nitride non-polar surfaces

Relaxations at nonpolar surfaces of III-V compounds result from a competition between dehybridization and charge transfer. First principles calculations for the (110) and (10$\bar{1}$0) faces of zincblende and wurtzite AlN, GaN and InN reveal an anomalous behavior as compared with ordinary III-V semiconductors. Additional calculations for GaAs and ZnO suggest close analogies with the latter. We interpret our results in terms of the larger ionicity (charge asymmetry) and bonding strength (cohesive energy) in the nitrides with respect to other III-V compounds, both essentially due to the strong valence potential and absence of $p$ core states in the lighter anion. The same interpretation applies to Zn II-VI compounds.Comment: RevTeX 7 pages, 8 figures included; also available at http://kalix.dsf.unica.it/preprints/; improved after revie

Orbital and millennial-scale environmental and sedimentological changes in the Okhotsk Sea during the last 350 kyr

http://www.godac.jamstec.go.jp/darwin/cruise/mirai/mr06-04_leg1/

ULTRASOUND DIAGNOSIS OF NECROTIZING ENTEROCOLITIS

The necrotizing enterocolitis remains the basic disease leading to a mortality of mainly prematurely born children with low and extremely low body weight. The percent of newborns with a necrotizing enterocolitis in recent years tends to increase that is connected with intensive development of a neonatology and resuscitation. The high prevalence of the necrotizing enterocolitis and the lethality accompanying it among prematurely born children remain at the high level, despite numerous researches on optimization of the principles of nursing and treatment, and in most cases meets at children at a stage of perforation of a wall of a gut and mekonialny peritonitis. Diagnostics at early stages of the begun pathological process in digestive tract at small children is extremely complicated. Recognition of precursory symptoms of a terrible disease is one of the first tasks of children’s surgeons and neonatolog. Radiodiagnosis serves as the most reliable diagnostic method at emergence of a clinical picture of a necrotizing enterocolitis. Definition of the most significant ultrasonic symptoms of a necrotizing enterocolitis remains an important task for ultrasonographers, neonatolog and children’s surgeons

Responses of the Okhotsk Sea environment and sedimentology on global climate changes at the orbital and millennial scale during the last 350 kyr

http://www.godac.jamstec.go.jp/darwin/cruise/mirai/mr06-04_leg1/