Embroidered Coils for Magnetic Resonance Sensors

Magnetic resonance imaging is a widely used technique for medical and materials imaging. Even though the objects being imaged are often irregularly shaped, suitable coils permitting the measurement of the radio-frequency signal in these systems are usually made of solid copper. One problem often encountered is how to ensure the coils are both in close proximity and conformal to the object being imaged. Whilst embroidered conductive threads have previously been used as antennae in mobile telecommunications applications, they have not previously been reported for use within magnetic resonance. In this paper we show that an embroidered single loop coil can be used in a commercial unilateral nuclear magnetic resonance system as an alternative to a solid copper. Data is presented showing the determination of both longitudinal (T1) and effective transverse (T2eff) relaxation times for a flat fabric coil and the same coil conformed to an 8 cm diameter cylinder. We thereby demonstrate the principles required for the wider use of fabric based conformal coils within nuclear magnetic resonance and magnetic resonance imaging

Исследование алгоритмов логического вывода

Decision support systems give an opportunity to «ascertained« information outputappropriate of user needs.SemanticV1.5beta package meant for representation and visualization knowledge by way of semantic network, as well as access to knowledge base on the graphical interface and query language.This article gives information about test and performance of indexing approach facts, realizedin SemanticV1.5beta

Продовольственная безопасность - обязательное условие устойчивого развития страны

В работе дается краткое описание проблеме продовольственной безопасности. Предлагается механизм, позволяющий на практике улучшить структуру питания населения, при этом увеличить производство отечественных продуктов функционального и специализированного назначения.The paper gives a brief description of the problem of food security. A mechanism is proposed that allows in practice to improve the structure of the population's nutrition, while increasing the production of domestic functional and specialized products

Влияние модулированного питающего напряжения на межвитковую изоляцию

Описание научно-квалификационной работы. В работе исследованы особенности электротеплового старения изоляции низковольтных обмоток электрических двигателей в составе частотно-регулируемого привода и предложены рекомендации по повышению надежности.Description of scientific qualification work. The features of an electrothermal aging of electric motors low-voltage windings insulation in variable frequency drive are studied and recommendations on reliability improving are proposed in this work