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    Wyświetlanie 1-6 z 6
    Tytuł:
    Organization activities for protection of the railway from exogenous processes
    Организаци онные мероприятия для защиты железных дорог от экзогенных процессов
    Działania organizacyjne dotyczące ochrony kolei przeciw procesom egzogenicznym
    Autorzy:
    Mirakhmedov, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/375472.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    natural and technical systems
    railway
    exogenous process
    sandy desert
    sand drifts
    kolej
    proces egzogenny
    pustynia piaszczysta
    zaspa piaszczysta
    Opis:
    The paper focuses on the reduction of negative effects on the railway exogenous processes (sand bars, landslides, etc.). Proposed to introduce a system of design, construction and operation of natural and technical objects set of organizational and technical measures, consisting of techniques: the choice of method, to map the distribution of exogenous events, the development of a program of measures for the protection and the optimization of the work program, assess the quality and effectiveness. Methodological elements are developed by the author of the complex method of risk assessment exogenous expression and scale of priorities of road elements of the defense.
    Статья посвяще на вопросам снижения негативного воздействия на железнодорожный путь экзогенных процессов (песчаные заносы, оползни, обвалы и др.). Для этого предлагается ввести в систему проектирования, строительства и эксплуатации природно-технических объектов комплекс организационно-технологических мероприятий, реализуемых в следующей логической последовательности: составление карты распространения экзогенного явления; выбор способов защиты; разработка программы реализации защитных мероприятий, ее оптимизация; оценка качества и результативности работ. Методологическими элементами комплекса являются разработанные автором методики оценки опасности экзогенного проявления и приоритетов элементов дороги на защиту.
    Źródło:
    Transport Problems; 2014, 9, 2; 27-33
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prospects fixation drift sands physicochemical method
    Перспективы закрепления подвижных песков физико-химическим методом
    Autorzy:
    Muzaffarova, M.
    Mirakhmedov, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/374039.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    sandy desert
    railway
    drifts
    physical and chemical methods
    technological gap
    resource
    pustynia piaszczysta
    kolej
    prądy
    metody fizyczne i chemiczne
    luka technologiczna
    źródła
    Opis:
    This article is based on the theoretical foundations of secure mobile sand being considered for reducing the negative impact of one of the manifestations of exogenous plains on such an important natural-technical system as a railroad. It suggests practical measures to build a system of design protection against sand drifts. The article also suggests ways to conserve resources and rational use of machinery and performers as well as the consolidation of mobile sand wet with water soluble waste of local production of waste dextrin. Consolidation is exposed on dry and wet sand.
    В статье, основываясь на теоретических положениях снижения негативного влияния экзогенных проявлений на железную дорогу, в частности, борьбы с песчаными заносами и исходя из практики закрепления подвижных песков, а также в целях экономии ресурсов и рационального использования машин и исполнителей, делается вывод о преимуществе водорастворимых вяжущих веществ из отходов местной промышленности, например, декстрина и применения его и других рекомендованных вяжущих в песках влажного состояния.
    Źródło:
    Transport Problems; 2016, 11, 3; 145-152
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Differences and commonalities impregnation of dry and wet sand
    Pazicia i obsnost processov pronitki cyhogo i blaznogo peska
    Autorzy:
    Мuzaffarova, M
    Mirakhmedov, M
    Powiązania:
    https://bibliotekanauki.pl/articles/374273.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    railway transportation
    sandy desert
    impregnation
    humidity
    plastic durability
    experiment planning
    optimisation
    transport kolejowy
    pustynia piaszczysta
    impregnacja
    wilgotność
    trwałość tworzywa sztucznego
    planowanie eksperymentu
    optymalizacja
    Opis:
    The article is devoted to research new methods of physic-chemical methods of preventing deflation to protect railways and highways from such phenomena as exogenous sand drifts. In particular, first studied the possibility of using binders in sand wet state. Results can significantly extend the scope of the method, and identified with particular impregnation maintaining stability requirements protective cover reduces both the concentration previously recommended binders, and their costs, thereby securing implementation in practice of shifting sands resource-saving technology.
    Статья посвящена новому в исследованиях способов физико-химического метода предупреждения дефляции для защиты железных и автомобильных дорог от такого экзогенного явления как заносы песком. В частности, впервые изучена возможность применения вяжущих веществ в песках влажного состояния. Результаты позволяют существенно расширить область применения метода, а выявленные при этом особенности пропитки сохраняя требования к устойчивости защитной вяжущей песчаной корки приводят к снижению как концентрации рекомендованных ранее вяжущих, так и их расходы, обеспечивая тем самым внедрение в практику закрепления подвижных песков ресурсосберегающей технологии.
    Źródło:
    Transport Problems; 2014, 9, 3; 91-97
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The hydrological role of biological topsoil crusts and water repellency in sandy dry-land areas
    Autorzy:
    Yair, A.
    Almog, R.
    Arbel, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/294458.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Geomorfologów Polskich
    Tematy:
    sandy areas
    rainfall gradient
    water regime
    biological soil crusts
    water repellency
    Negev Desert
    Opis:
    Dryland areas are regarded as highly sensitive to climatic changes. A positive relationship between rainfall and environmental factors is often assumed for areas with an average annual rainfall of 100–300 mm. This assumption disregards the fact that a climate change in arid areas is not limited to climatic factors. It is often accompanied by a pronounced spatial variability in surface characteristics. The present work deals with the complex relationships among average annual rainfall, surface properties and the spatial redistribution of water resources in sandy areas located in the Northern Negev Desert. Two case studies are considered. The first deals with the hydrological effects of biological topsoil crusts on the water regime, along a rainfall gradient (86–170 mm). This study is based on five monitoring sites. Data obtained show a decrease in water availability with increasing annual rainfall. The findings are attributed to the decisive role played by the non-uniform properties of the topsoil crust along the rainfall gradient. The second case refers to the non-uniform development, and survival, of planted trees. Trees planted on steep dunes are well developed, with a high survival rate, whereas trees planted on low angle dunes are small. This study focused on the role of a water repellent layer on the water regime. Data obtained show a striking difference between steep and low dunes in all aspects studied, namely the degree of water repellency, frequency and magnitude of runoff events, infiltration depth and soil moisture. All variables monitored were found higher on steep than on low dunes. The large trees shed a substantial amount of leaves, whose decay developed a water repellent layer. Runoff generation over the repellent layer enhanced deep water penetration, through the process of subsurface flow. The lack of a water repellent layer over the low dunes prevented runoff generation, with its positive effects.
    Źródło:
    Landform Analysis; 2018, 36; 33-44
    1429-799X
    Pojawia się w:
    Landform Analysis
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Processes of running sands decay in the Bledow Desert during the last 30 years [Silesian Upland, South Poland]
    Autorzy:
    Rahmonow, O
    Snieszko, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1450596.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    Silesian Upland
    history
    Polska
    primary succession
    fossil soil
    physical geography
    pine wood
    Bledowska Desert
    secondary succession
    soil
    sandy substratum
    climatic parameter
    terrestrial ecosystem
    Opis:
    The Błędów Desert is situated in the south of Poland. In this area, sand-gravel sediments predominate. The origin of the Błędów Desert is not associated with climatic conditions but with a strong development of excavation industry which started in the region in the Middle Ages. The surrounding forests became the main fuel source for the development of mining and metallurgical industry. Therefore, the area of the Błędów Desert was completely deforested. The paper presents reasons for the acceleration of biocenotical systems in the investigation area. For this purpose, transects representative for the following stages of plants successions: stage of encroachment plants, stage of sodding, stage of bushes (shrubs), stage of biogroup and stage of afforestation were made. Plant succession in the investigated transects developed in a multidirectional way. The ground for plants settling in the Błędów Desert represents fluvoiglacial, fluvial and aeolian sand with various grain sizes. Locally, in the old deflation fields, relict horizons of older podzolic and rust-coloured soil are the ground for the invading plants. The process of plant and soil succession takes place at the same time. Content of the available mineral elements in the initial horizons is different; it depends on the plant species in the places where these horizons developed.
    Źródło:
    Acta Agrophysica; 2001, 50; 197-205
    1234-4125
    Pojawia się w:
    Acta Agrophysica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Osady eoliczne (wydmowe) w suchym i półsuchym regionie płaskowyżu Alashan (MongoliaWewnętrzna, Chiny)
    Aeolian (dune) deposits in arid to semi-arid region of the Alashan Plateau (Inner Mongolia, China)
    Autorzy:
    Kenig, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074941.pdf
    Data publikacji:
    2012
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    osady eoliczne
    megadunes
    obszary pustynne
    regiony źródłowe
    kierunek wiatru
    Pustynia Alashan
    Hunshandake
    Chiny
    aeolian deposits
    megadiunes
    sandy lands
    source regions
    wind directions
    Alashan Desert
    China
    Opis:
    In northern China, sandy and rocky deserts are located in arid regions west of the Helan Mountains (Helan Shan), while the areas of fixed sand dunes stretch in semi-arid regions east of the Helan Mountains. Helan Mountains, trending nearly NS in the northern part of China's Inner Mongolia Autonomous Region, are a natural border between the dry climate to the west and the semi-dry climate to the east. In the Badain Jaran Desert (part of the Alashan Desert), there are the largest dunes in China, and possibly the largest in the world. They attain a height of up to 460 m in the southeastern part of the desert. Due to their size, they are called megadunes by the Chinese researchers. They are accompanied by numerous smaller dunes, developed in various forms, which cover their slopes. As a result, megadune complexes form, reaching 10 km in length. The general direction of the dunes is NE-SW. In their lower parts, they are covered with sparse xerophytic vegetation, mainly Artemisia and Ephedra. In interdunal depressions of the Badain Jaran Desert, there are numerous (140) permanent, relatively shallow and drying-up lakes, overgrowing with vegetation. Their average depths are 2 m, rarely reaching 16 m mainly in the northern part. The water in the lakes is highly alkaline, with pH values of up to 10.5. Sometimes, the accumulation of salt is so substantial that allows it to be extracted. The groundwater in the immediate surroundings of dunes shows a much lower alkalinity and the average pH is 7.8. To the east of the Helan Mountains, there are several deserts of generally smaller areas and specific environmental nature. This is a sandy land of Hunshandake. Dunes and dune fields are lower and less well developed morphologically, reaching an average of 5-10 m in height. They are mostly stabilized completely or partially by vegetation. The main trend of dunes here is WNW-ESE. Locally, shallow lakes occur in interdunal areas. Studies of mineral and chemical composition of silt material are important for the considerations of the source and direction of silt transport in Asia. One of the diagnostic components of detrital minerals is dolomite. The newest studies of silts recently deposited in Beijing provide information about the wind-transportation direction. It appears that there is a fundamental difference in the mineral composition of silts originating from the dust storm (in 2006) and silts from the entire spring period. Such conclusions are also confirmed by the content of rare earths elements in the 2006 dust storm sediments from Beijing and, comparatively, from other deserts as potential source areas of silts (Yang et al., 2007b). Isotopic investigations of Nd and Sr in aeolian sediments of northern China confirm such a possibility. An important problem for the areas located in northern China is the process of desertification. Noticeable differences have occurred already during the last three decades. They consist in changes in the distribution of movable dunes, which is relative to the humidity and temperature. It is believed that the climate may be the main factor causing desertification in Hunsheandake. In other regions of China, there is another significant factor: human activity, especially shepherding that causes the process of desertification and environmental degradation.
    Źródło:
    Przegląd Geologiczny; 2012, 60, 5; 267--272
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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