Определение эксплуатационных параметров ядерных реакторов малой мощности

Цель работы – определение эксплуатационных параметров ядерного реактора малой мощности, работающего в различных ядерных топливных циклах. В процессе исследования проводились расчеты нейтронно-физических характеристик реактора, на основании которых были получены таблицы и построены графики; произведен расчет финансовой составляющей работы, описаны внешние факторы, влиявшие на выполнение работы. В результате исследования были получены нейтронно-физические характеристики реактора заданного материального состава, оценена финансовая составляющая работа и описаны внешние факторы, которые влияли на работу. Основные характеристики: ядерный мощностью 20 МВт с топливом UO2 и обогащением 6 % и с теплоносителем вода, использующего в качестве конструкционных материалов циркалой-2.Objective - definition of operational parameters of low power nuclear reactor operating in various nuclear fuel cycles. The study carried out calculations of neutron-physical characteristics of the reactor, on the basis of which the tables and the graphs were obtained; The calculation of the financial component of the work are described the external factors influencing the performance of the work. The study was prepared by the reactor neutron-physical characteristics of a given material composition, evaluated the financial component of the work and described the external factors that affect the job. Key Features: a nuclear capacity of 20 MW with UO2 fuel and enrichment 6% and a water-cooled, employing as structural materials Zircaloy-2

Susac's syndrome: Leptomeningeal enhancement on 3D FLAIR MRI

BACKGROUND Contrast-enhanced (ce) fluid-attenuated inversion recovery magnetic resonance imaging (FLAIR MRI) has recently been shown to identify leptomeningeal pathology in multiple sclerosis. OBJECTIVE To demonstrate leptomeningeal enhancement on three-dimensional (3D) FLAIR in a case of Susac's syndrome. METHODS Leptomeningeal enhancement was correlated with clinical activity over 20 months and compared to retinal fluorescein angiography. RESULTS The size, number, and location of leptomeningeal enhancement varied over time and generally correlated with symptom severity. The appearance was remarkably similar to that of retinal vasculopathy. CONCLUSION Ce 3D FLAIR may aid in diagnosis and understanding of pathophysiology in Susac's syndrome and may serve as a biomarker for disease activity

Subtle Imaging Findings Aid the Diagnosis of Adolescent Hereditary Spastic Paraplegia and Ataxia.

PURPOSE Hereditary spastic paraplegia (HSP) and hereditary spastic ataxia (HSA) are a heterogeneous group of genetic disorders characterized by progressive lower limb spasticity resulting from pyramidal tract dysfunction. By identifying critical imaging findings within the clinical context of spasticity, radiologists are uniquely positioned to recommend specific genetic testing, and thus facilitate diagnosis. METHODS We present two examples of HSP and HSA that had gone clinically unrecognized for years, and in which magnetic resonance imaging played a critical role in the diagnosis. RESULTS Radiologists' awareness of HSP and HSA, combined with a critical review of the clinical history and characteristic imaging findings led to specific genetic testing and a definitive diagnosis. CONCLUSION Awareness of HSP and HSA among radiologists will expedite more accurate diagnosis, explanation of patient symptoms, recommendation for syndrome-specific treatment, and family planning considerations