Воздействие высокоэнергетических пучков быстрых электронов на полимерные радиационно-защитные композиты

Исследовано влияние пучков быстрых электронов на структуру и свойства радиационно-защитных композиционных материалов, капсулированных в полимерные термопластичные оболочки. Представлены результаты теоретических расчетов пробега быстрых электронов в полимерном композите, оценка защитных характеристик и экспериментальные результаты по изменению мощности дозы электронного излучения за слоями полимерного композита с объемным электрическим зарядом. Исследована аморфно-кристаллическая структура, макросвойства и деструкция полимерного композита.Досліджено вплив пучків швидких електронів на структуру і властивості радіаційно-захисних композиційних матеріалів, капсулірованих в полімерні термопластичні оболонки. Представлено результати теоретичних розрахунків пробігу швидких електронів в полімерному композиті, оцінка захисних характеристик і експериментальні результати по зміні потужності дози електронного випромінювання за шарами полімерного композиту з об'ємним електричним зарядом. Досліджена аморфно-кристалічна структура, макровластивості та деструкція полімерного композиту.In work influence of bunches of rapid electrons is explored on a structure and properties of radiation-protective materials of compositions, kapsulirovannykh in polymeric termoplastichnye shells. The results of theoretical calculations of run of rapid electrons are presented in polymeric kompozite, estimation of protective descriptions and experimental results on a change power of dose of electronic radiation after the layers of polymeric kompozita with a by volume electric charge. An amorphously-crystalline structure and destruction of polymeric kompozita, is explored

The Trail, 1963-11-06

https://soundideas.pugetsound.edu/thetrail_all/1878/thumbnail.jp

The Trail, 1964-03-04

https://soundideas.pugetsound.edu/thetrail_all/1883/thumbnail.jp

Vocabulary and grammar development in young learners of English as an additional language

Internationally, an increasing number of children learn English as an additional language (EAL). Children with EAL grow up in an environment where English is the majority language but are exposed to a different, minority language at home. Despite the increase in the number of EAL learners around the world, comparatively little is known about the development of their vocabulary and grammar at preschool age. Furthermore, the use of different methods in EAL studies can make research evidence difficult to summarize. The aim of this chapter is to provide a comprehensive review of EAL learners’ vocabulary and grammar development at preschool, drawing from studies that have used standardized tests, experimental tasks, or both. This review indicates that few studies have focused on preschool children with EAL. These suggest that, at the earliest stages of language learning, EAL learners generally know fewer words and acquire grammatical constructions at a slower pace than their English monolingual peers. These differences often persist throughout development, risking a negative impact on EAL learners’ academic attainment in an English-only school environment. Thus, this chapter also includes some suggestions for practice that could help children with EAL develop their vocabulary and grammar knowledge during and after preschool