1,365 research outputs found

    Numerical model for investigation of characteristics of high-intensity light energy reflected from wavy surface

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    Для численного исследования эффекта аномального обратного рассеяния предложена оптическая модель среды, состоящая из плоских частиц. Представлены результаты численного исследования, иллюстрирующие ярко выраженную спектральную зависимость эхо-сигнала от оптических и микрофизических параметров среды. Показана возможность оценки оптических и микрофизических свойств среды по данным аномального обратного рассеяния. Комплекс программ, реализующий оптическую модель среды для расчета характеристик коэффициента обратного рассеяния для плоских и сферических частиц был разработан на кроссплатформенной среде Qt

    Загрязнение поверхностных вод в пределах г. Уфы

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    В статье рассматривается состояние поверхностных вод водных объектов в пределах г. Уфы. Сравнение концентраций загрязняющих веществ в створах различных частей города позволяет определить особенности влияния источников на загрязнение водной среды в пределах г. Уфы.The article considers the surface waters state of water bodies within the Ufa city. Comparison of pollutants concentrations of in cross-sections different parts of the city allows to deterстворmine the peculiarities of the sources influence on the aquatic environment pollution within the city of Ufa

    Estimating rainfall erosivity from daily precipitation records: a comparison among methods using data from the Ebro Basin (NE Spain)

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    Among the major factors controlling soil erosion, as vegetation cover or soil erodibility, rainfall erosivity has a paramount importance since it is difficult to predict and control by humans. Accurate estimation of rainfall erosivity requires continuous rainfall data; however, such data rarely demonstrate good spatial and temporal coverage. Daily weather records are now commonly available, providing good coverage that better represents rainfall intensity behavior than do more aggregated rainfall data. In the present study annual rainfall erosivity was estimated from daily rainfall records, and compared to data obtained employing the RUSLE R factor procedure. A spatially-dense precipitation database of high temporal resolution (15 min) was used. Two methodologies were applied: (i) daily rainfall erosivity estimated using several parametric models, and, (ii) annual rainfall erosivity estimated by regression-based techniques employing several intensity precipitation indices and the modified Fournier index. To determine the accuracy of estimates, several goodness-of-fit and error statistics were computed in addition to a spatial distribution comparison. The daily rainfall erosivity models accurately predicted annual rainfall erosivity. Parametric models with few combined parameters and a periodic function simulating intra-annual rainfall behavior provided the best results. Where daily rainfall records were not available, good estimates of annual rainfall erosivity were also obtained using regression-based techniques based on 5-day maximum precipitation events, the maximum wet spell duration, and the ratio between the lengths of average wet and dry spells. Inherent limitations remain in the use of daily weather records for estimating rainfall erosivity. Future research should focus on incorporating measures of natural rainfall properties of the particular region, including kinetic energy and intensity, and their effects on the soil.We thank the Ebro River Hydrographical Confederation (Confederación Hidrográfica del Ebro; CHE) for providing the data used in this study. The research of M.A. was supported by a JAE-Predoc Research Grant from the Spanish National Research Council (Consejo Superior de Investigaciones Científicas; CSIC).Peer reviewe

    Grounding systems for power supply facilities

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    This study aims to define some recommendations for choice of grounding system type for power supply facility. Operating modes of 0.4 kV networks approved by International Electrotechnical Commission (IEC) were considered and their advantages and disadvantages were identified. The comparison criteria were based on the conditions of human safety from electric shock in the breakdown of insulation on the body of electrical equipment, possibilities of expanding the network and uninterruptible power supply. The real application of the neutral modes and the possibility of installing protective devices were also taken into account. All the recommendations made is planned to apply for the modernization of the urban networks and the calculation of the earthing arrangement by using special software

    Методы борьбы и защиты промысловых трубопроводов от внутренней коррозии на Советско-Соснинском нефтяном месторождении (Томская область)

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    Анализ экономической эффективности методов повышения эксплуатационной надежности промысловых трубопроводов, борьбы с коррозией.Analysis of the economic efficiency of methods to improve the operational reliability of field pipelines, corrosion control

    Обеспечение безопасности и разработка мероприятий по предупреждению и ликвидации аварийного разлива нефти и нефтепродуктов на нефтеперерабатывающем предприятии

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    Провести анализ готовности предприятия к предупреждению аварийного розлива и нефтепродуктов. Сделать анализ сценариев возможных аварий, связанных с розливом нефтепродуктов. Выполнить необходимые расчеты сил и средств по предложенным сценариям. Разработать план действий при ЧС связанный с розливом нефтепродуктов на примере термического цеха № 17.Analyze the company's readiness to prevent emergency filling and oil products. Analyze scenarios of possible accidents related to the filling of petroleum products. Perform the necessary calculations of forces and means according to the proposed scenarios.Develop an emergency action plan related to the bottling of petroleum products on the example of thermal shop No. 17

    Diplomalı kız

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    Ahmet Mithat'ın Tercüman-ı Hakikat'te tefrika edilen Diplomalı Kız adlı roman
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