329 research outputs found

    Asymptotic properties of self-similar traffic models based on discrete-time and continuous-time martingales

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    Asymptotic properties of self-similar traffic models based on discrete-time and continuous-time martingales are considered. We discovered that their performance indicators are asymptotically equal at λ → ∞ to indicators for model based on Brownian motion

    Geomagnetic disturbances at high latitudes during very low solar wind density event

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    Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/94969/1/grl13480.pd

    Strong atmospheric disturbances as a possible origin of inner zone particle diffusion

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    A Method and a Device for Diagnostics of the Functional State of Peripheral Vessels of the Upper Limbs

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    The article suggests a method and a device for diagnostics of the functional state of peripheral vessels of the upper limbs, which provide identification of angiospastic disorders with a lower probability of falsenegative result, allowing thereby the quality of diagnostics to be improved. The suggested approach is based on combined application of laser Doppler flowmetry and contact thermometry during an occlusion test. The obtained results can be used in various fields of medicine for the development of multifunctional noninvasive diagnostic systems for the diagnosis and prevention of diseases associated with changes in the functional state of peripheral vessels

    Efficient 1 W continuous-wave diode-pumped Er,Yb:YAl3(BO3)4 laser

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    We report the spectroscopy and high-power continuous-wave (CW) diode-pumped laser operation of Er:Yb:YAl3(BO3)4 crystal. Absorption and stimulated emission spectra, emission lifetimes, and efficiency of energy transfer from Yb3+ to Er3+ ions were determined. A CW Er:Yb:YAB laser emitting at 1602, 1555, and 1531 nm with output power as high as 1 W and slope efficiency up to 35% was demonstrated

    Безопасность и медико-экономическая эффективность превентивного лечения детей с латентной туберкулезной инфекцией

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    The objective: to assess the safety and medical cost effectiveness of different LTBI treatment regimens in children and adolescents.Subjects and methods. 205 children in the age from 6 to 17 years old with latent tuberculosis infection were included in the study: The main (prospective) group included 31 children who were treated with isoniazid and rifapentine (HRpt). The comparison (retrospective) group included 174 pediatric patients: 128 patients received the regimen consisting of isoniazid and pyrazinamide (HZ), 14 patients received isoniazid and rifampicin (HR), and 32 patients received isoniazid and ethambutol (HE).Results. When using the HRpt regimen, the treatment was well tolerated; adverse events (eosinophilia) were documented in 6.5% of children. The medications were taken once a week and it allowed reducing the frequency of treatment interruptions for non-medical reasons. The overall cost per patient was lower with the HRpt regimen than with the other three LTBI treatment regimens. Цель исследования: оценить безопасность и медико-экономическую эффективность различных схем терапии ЛТИ у детей и подростков.Материалы и методы. В исследование включено 205 детей с латентной туберкулезной инфекцией в возрасте от 6 до 17 лет включительно. В основной группе (проспективной) был 31 ребенок со схемой лечения изониазид, рифапентин (HRpt). В группу сравнения (ретроспективной) включено 174 ребенка: 128 ‒ получали схему изониазид, пиразинамид (HZ), 14 ‒ схему изониазид, рифампицин (HR), 32 ‒ схему изониазид, этамбутол (HE).Результаты. При использовании схемы HRpt отмечена удовлетворительная переносимость лечения, нежелательные явления (эозинофилия) зарегистрированы у 6,5% детей. Режим приема препаратов 1 раз в неделю способствует снижению частоты прерывания лечения не по медицинским причинам. Общие экономические затраты на одного пациента при использовании схемы HRpt были ниже, чем при использовании трех иных схем лечения ЛТИ.

    PECULARITIES OF MECHANICAL PROPERTIES OF HIGH-PURITY, IODIDE AND HAFNIUM GFE-1 IN TEMPERATURE RANGE 20-900°C

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    Here is given the results of investigation of mechanical properties of high-purity hafnium, iodide hafnium and hafnium GFE-1 at temperature range 20-900°C. Taken results are testifying about considerable influence of methods of receiving hafnium, its purity and mechanical-thermal processing on mechanical properties. The characteristic abnormalities of mechanical properties in the temperature range 20-900°C for different purity hafnium are discussed

    СИНТЕЗ СИСТЕМЫ ЗАЖИГАНИЯ АВТОМОБИЛЯ, РАБОТАЮЩЕГО НА ОЗОНИРОВАННОМ ТОПЛИВЕ

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    The paper presents a mathematical model for electronic control system of the angular ignition timing (AIT) in the (ICE), which is running on ozonized fuel. An algorithm for  ignition system control of internal combustion engine using ozonized fuel has been developed in the paper. A structure of the dynamic ignition system while using a control unit for supplying  ozone into fuel with a purpose to improve automobile ecological and economical indices adapted to operational conditions. Application of the given system allows to ensure minimum reduction of operational petrol consumption and concentration of incomplete combustion products due to optimum ozone dosage into the fuel.  The paper proposes a controlled automobile ignition system as a sequential scheme which has a great number of discrete inputs and outputs and many discrete internal  states. The scheme establishes a functional dependence between input and output states. The paper provides an assessment of ecological indices according to massive emissions of carbon monoxide СО, hydrocarbon СпНт and nitric oxide NOx .  The analysis of  investigations results has been carried out in the paper.Разработана математическая модель электронной системы управления углом опережения зажигания (УОЗ) в двигателе внутреннего сгорания (ДВС), работающем на озонированном топливе. Разработан алгоритм управления системой зажигания ДВС на озонируемом топливе. Создана структура динамической системы зажигания с использованием блока управления подачи озона в топливо для повышения экологических и экономических показателей автомобиля адаптированных к условиям эксплуатации. Применение данной системы позволяет за счет дозирования оптимального количества озона в топливо обеспечить снижение расхода бензина и концентрации продуктов неполного сгорания с точки зрения минимумов в условиях эксплуатации. Представлена управляемую систему зажигания автомобиля как последовательную схему, которая имеет множество дискретных входов, множество дискретных выходов и множество дискретных внутренних состояний. Схема устанавливает функциональную зависимость между состояниями входа и состояниями выхода. Проведена оценка экологических показателей по массовым выбросам оксида углерода СО углеводородов СпНт, оксидов азота NOx, выполнен анализ результатов исследований
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