Разработка метода формирования износостойких поверхностных слоев в технически чистом алюминии

Объектом исследования является технически чистый алюминий марки А7, подвергнутый азотированию в плазме несамостоятельного частотно-импульсного тлеющего разряда с полым катодом при низком давлении. Цель работы – разработка метода формирования износостойких поверхностных слоев в технически чистом алюминии. Проведены исследования механических и трибологических свойств материала (микротвердость, коэффициент износа, коэффициент трения). В результате исследования выявлен режим азотирования, позволяющий кратно повысить трибологические и механических характеристики технически чистого алюминия марки А7.The subject of the study is technically pure aluminum of the A7, subjected to nitriding in the plasma of a frequency-pulse non-self-sustained glow discharge with a hollow cathode at low pressure. The aim of the work is to development of a method for the formation of wear-resistant surface layers in technically pure aluminum. Mechanical and tribological properties of the material (microhardness, wear coefficient, coefficient of friction) are studied. As a result of the study, the nitriding mode was revealed, which allows to increase the tribological and mechanical characteristics of technically pure aluminum of the A7

Incidental findings on brain magnetic resonance imaging: systematic review and meta-analysis

Objective To quantify the prevalence of incidental findings on magnetic resonance imaging (MRI) of the brain

Genomic Relationships, Novel Loci, and Pleiotropic Mechanisms across Eight Psychiatric Disorders

Genetic influences on psychiatric disorders transcend diagnostic boundaries, suggesting substantial pleiotropy of contributing loci. However, the nature and mechanisms of these pleiotropic effects remain unclear. We performed analyses of 232,964 cases and 494,162 controls from genome-wide studies of anorexia nervosa, attention-deficit/hyper-activity disorder, autism spectrum disorder, bipolar disorder, major depression, obsessive-compulsive disorder, schizophrenia, and Tourette syndrome. Genetic correlation analyses revealed a meaningful structure within the eight disorders, identifying three groups of inter-related disorders. Meta-analysis across these eight disorders detected 109 loci associated with at least two psychiatric disorders, including 23 loci with pleiotropic effects on four or more disorders and 11 loci with antagonistic effects on multiple disorders. The pleiotropic loci are located within genes that show heightened expression in the brain throughout the lifespan, beginning prenatally in the second trimester, and play prominent roles in neurodevelopmental processes. These findings have important implications for psychiatric nosology, drug development, and risk prediction.Peer reviewe

The Anglo-Saxon migration and the formation of the early English gene pool.

The history of the British Isles and Ireland is characterized by multiple periods of major cultural change, including the influential transformation after the end of Roman rule, which precipitated shifts in language, settlement patterns and material culture1. The extent to which migration from continental Europe mediated these transitions is a matter of long-standing debate2-4. Here we study genome-wide ancient DNA from 460 medieval northwestern Europeans-including 278 individuals from England-alongside archaeological data, to infer contemporary population dynamics. We identify a substantial increase of continental northern European ancestry in early medieval England, which is closely related to the early medieval and present-day inhabitants of Germany and Denmark, implying large-scale substantial migration across the North Sea into Britain during the Early Middle Ages. As a result, the individuals who we analysed from eastern England derived up to 76% of their ancestry from the continental North Sea zone, albeit with substantial regional variation and heterogeneity within sites. We show that women with immigrant ancestry were more often furnished with grave goods than women with local ancestry, whereas men with weapons were as likely not to be of immigrant ancestry. A comparison with present-day Britain indicates that subsequent demographic events reduced the fraction of continental northern European ancestry while introducing further ancestry components into the English gene pool, including substantial southwestern European ancestry most closely related to that seen in Iron Age France5,6

Author Correction: The Anglo-Saxon migration and the formation of the early English gene pool.

See original record