8 research outputs found

    Use of anticoagulants and antiplatelet agents in stable outpatients with coronary artery disease and atrial fibrillation. International CLARIFY registry

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    Картографирование растительного покрова и запасов углерода в почве с использованием ГИС, данных дистанционного зондирования и цифровой модели рельефа

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    This study employed an algorithm of vegetation cover mapping based on a spatial analysis of Landsat OLI satellite imagery, a digital elevation model (DEM) and field data using geographic information systems (GIS) and expert knowledge. Applying this algorithm, maps of vegetation types and vegetation growth conditions were built for the test site in the northern part of near-Yenisei Siberia (Krasnoyarsk region). The spatial analysis of these two maps with field samples were used for the extrapolation and mapping of soil carbon stock volumes (kgC/m2)В статье представлено применение алгоритма картографирования растительного покрова на основе спутниковых данных Landsat OLI, цифровой модели рельефа (ЦМР) SRTM и материалов полевых исследований. С использованием предложенного алгоритма и ГИС-технологий были составлены карты лесорастительных условий и актуальной растительности для тестовой территории в северной части Приенисейской Сибири. На основе пространственного анализа полученных карт и данных полевых измерений были выполнены экстраполяция и картографирование величин запасов углерода в почве (кгС/м2

    Картографирование растительного покрова и запасов углерода в почве с использованием ГИС, данных дистанционного зондирования и цифровой модели рельефа

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    This study employed an algorithm of vegetation cover mapping based on a spatial analysis of Landsat OLI satellite imagery, a digital elevation model (DEM) and field data using geographic information systems (GIS) and expert knowledge. Applying this algorithm, maps of vegetation types and vegetation growth conditions were built for the test site in the northern part of near-Yenisei Siberia (Krasnoyarsk region). The spatial analysis of these two maps with field samples were used for the extrapolation and mapping of soil carbon stock volumes (kgC/m2)В статье представлено применение алгоритма картографирования растительного покрова на основе спутниковых данных Landsat OLI, цифровой модели рельефа (ЦМР) SRTM и материалов полевых исследований. С использованием предложенного алгоритма и ГИС-технологий были составлены карты лесорастительных условий и актуальной растительности для тестовой территории в северной части Приенисейской Сибири. На основе пространственного анализа полученных карт и данных полевых измерений были выполнены экстраполяция и картографирование величин запасов углерода в почве (кгС/м2

    Природа крупных пожаров в подзонах тайги Центральной Сибири

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    The work deals with the nature of large wildfires, conditions of their occurrence and distribution in the taiga of Central Siberia. The large fires in this region occur during periods of prolonged and intense drought, with precipitation deficit more than 60 % of the norm. Vegetation and climate conditions of large fires are identified and map of their distribution is compiled using satellite information. Fire seasons scenarios are examined, and an iterative model for short-term forecasting of extreme fire situations is proposed. Methodology for short-term forecasting of large wildfires risk is offered based on satellite data simultaneously on the whole territory of Central SiberiaВ статье рассматриваются вопросы природы пожаров, условия их возникновения и распространения в подзонах тайги Центральной Сибири. Установлено, что крупные пожары в этом регионе возникают в периоды длительных и интенсивных засух с недобором осадков более 60 % от нормы. Выявлены растительные и климатические условия распространения крупных пожаров и составлена карта их распределения по территории по космической информации. Рассмотрены сценарии развития пожароопасных сезонов, предложены итерационная модель краткосрочного прогнозирования экстремальной пожароопасной обстановки и методика краткосрочного прогноза опасности возникновения ландшафтных пожаров по спутниковым данным одновременно на всей территории Центральной Сибир

    Природа крупных пожаров в подзонах тайги Центральной Сибири

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    The work deals with the nature of large wildfires, conditions of their occurrence and distribution in the taiga of Central Siberia. The large fires in this region occur during periods of prolonged and intense drought, with precipitation deficit more than 60 % of the norm. Vegetation and climate conditions of large fires are identified and map of their distribution is compiled using satellite information. Fire seasons scenarios are examined, and an iterative model for short-term forecasting of extreme fire situations is proposed. Methodology for short-term forecasting of large wildfires risk is offered based on satellite data simultaneously on the whole territory of Central SiberiaВ статье рассматриваются вопросы природы пожаров, условия их возникновения и распространения в подзонах тайги Центральной Сибири. Установлено, что крупные пожары в этом регионе возникают в периоды длительных и интенсивных засух с недобором осадков более 60 % от нормы. Выявлены растительные и климатические условия распространения крупных пожаров и составлена карта их распределения по территории по космической информации. Рассмотрены сценарии развития пожароопасных сезонов, предложены итерационная модель краткосрочного прогнозирования экстремальной пожароопасной обстановки и методика краткосрочного прогноза опасности возникновения ландшафтных пожаров по спутниковым данным одновременно на всей территории Центральной Сибир

    Ecological and conceptual consequences of Arctic pollution

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    Although the effect of pollution on forest health and decline received much attention in the 1980s, it has not been considered to explain the ‘Divergence Problem’ in dendroclimatology; a decoupling of tree growth from rising air temperatures since the 1970s. Here we use physical and biogeochemical measurements of hundreds of living and dead conifers to reconstruct the impact of heavy industrialisation around Norilsk in northern Siberia. Moreover, we develop a forward model with surface irradiance forcing to quantify long‐distance effects of anthropogenic emissions on the functioning and productivity of Siberia’s taiga. Downwind from the world’s most polluted Arctic region, tree mortality rates of up to 100% have destroyed 24,000 km2 boreal forest since the 1960s, coincident with dramatic increases in atmospheric sulphur, copper, and nickel concentrations. In addition to regional ecosystem devastation, we demonstrate how ‘Arctic Dimming’ can explain the circumpolar ‘Divergence Problem’, and discuss implications on the terrestrial carbon cycle.ISSN:1461-023XISSN:1461-024

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    Worldwide Disparities in Recovery of Cardiac Testing 1 Year Into COVID-19

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    BACKGROUND The extent to which health care systems have adapted to the COVID-19 pandemic to provide necessary cardiac diagnostic services is unknown.OBJECTIVES The aim of this study was to determine the impact of the pandemic on cardiac testing practices, volumes and types of diagnostic services, and perceived psychological stress to health care providers worldwide.METHODS The International Atomic Energy Agency conducted a worldwide survey assessing alterations from baseline in cardiovascular diagnostic care at the pandemic's onset and 1 year later. Multivariable regression was used to determine factors associated with procedure volume recovery.RESULTS Surveys were submitted from 669 centers in 107 countries. Worldwide reduction in cardiac procedure volumes of 64% from March 2019 to April 2020 recovered by April 2021 in high- and upper middle-income countries (recovery rates of 108% and 99%) but remained depressed in lower middle- and low-income countries (46% and 30% recovery). Although stress testing was used 12% less frequently in 2021 than in 2019, coronary computed tomographic angiography was used 14% more, a trend also seen for other advanced cardiac imaging modalities (positron emission tomography and magnetic resonance; 22%-25% increases). Pandemic-related psychological stress was estimated to have affected nearly 40% of staff, impacting patient care at 78% of sites. In multivariable regression, only lower-income status and physicians' psychological stress were significant in predicting recovery of cardiac testing.CONCLUSIONS Cardiac diagnostic testing has yet to recover to prepandemic levels in lower-income countries. Worldwide, the decrease in standard stress testing is offset by greater use of advanced cardiac imaging modalities. Pandemic-related psychological stress among providers is widespread and associated with poor recovery of cardiac testing. (C) 2022 The Authors. Published by Elsevier on behalf of the American College of Cardiology Foundation
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