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    Wyświetlanie 1-18 z 18
    Tytuł:
    Impact of T-Splitter on the Laminar Flow Field around Cylinder Pier
    Autorzy:
    Qasim, Rafi Mohammed
    Faisal, Safaa Hameed
    Jabbar, Tahseen Ali
    Powiązania:
    https://bibliotekanauki.pl/articles/2204700.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    bridge pier
    hydraulic field
    laminar flow
    T-splitter
    Opis:
    The hydrodynamic pattern, which surrounds the pier near a splitter that has T-shape, is investigated by adopting a numerical method and using ANSYS Fluent Software to achieve computation. The essential objective of this paper refers to revealing the behavior of the hydrodynamic field around the pier due to the existence of the upstream splitter plate. The T-splitter plate has not been used in previous works for controlling the flow field around the cylinder body. The main assumptions adopted in solving the hydrodynamic problem are incompressible, steady, and laminar flow. Reynolds number values are taken from 40 to 200 to guarantee laminar flow with laminar vortex street. The numerical investigation focuses on two main variables. These variables are the horizontal distance between the rear portion of a splitter and the pier center and bubble length. The numerical study comprises pressure contours, water velocity contours, and streamlines. Results reveal that bubbles are generated and developed due to the existence of the splitter. Four bubbles are generated, two of them are formed in the region between the splitter rear portion and pier leading portion and the other two bubbles are formed at the cylindrical pier wake region. The size and length of these four bubbles are dominated by the Reynolds number, these bubbles are non-symmetrical. It is revealed from the solution that with the rise in Reynolds number values then the disturbance will be increased simultaneously. The horizontal distance dominates the hydraulic response, which is described by the streamlines, pressure contours, and water flow contours. Furthermore, the Reynolds number has a significant influence on the pressure contours, water flow contours, and streamlines. Finally, a correlation equation is derived relying on bubble length, horizontal distance, and Reynolds number.
    Źródło:
    Advances in Science and Technology. Research Journal; 2022, 16, 5; 202--215
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Failure risk analysis of water distributions systems using hydraulic models on real field data
    Autorzy:
    Studziński, Andrzej
    Pietrucha-Urbanik, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/95758.pdf
    Data publikacji:
    2019
    Wydawca:
    Fundacja Ekonomistów Środowiska i Zasobów Naturalnych
    Tematy:
    zaopatrzenie w wodę
    awaria
    model hydrauliczny
    wskaźnik ryzyka
    analiza niezawodności
    water supply
    failure
    hydraulic model
    risk indicator
    reliability analysis
    Opis:
    At this paper the analysis of failure risk in the two water supply systems in the south-eastern Poland is presented. For this purpose the hydraulic models of the water networks created in the EPANET 2 on the basis of data obtained from the water networks operation were used. The consequences of failure of individual pipelines were determined. The areas that are most vulnerable to pressure fluctuations in the water supply system resulting from the failure of these pipelines, were located.
    Źródło:
    Ekonomia i Środowisko; 2019, 1; 152-165
    0867-8898
    Pojawia się w:
    Ekonomia i Środowisko
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Outline of the method for prediction of lifetime achieved by ayionic hydraulic drives operated under real field conditions
    Autorzy:
    Ułanowicz, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/242145.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    lifetime
    probability density function
    hydraulic drive
    pump delivery
    structural parameter
    deterioration rate
    wear and tear
    Opis:
    The presented approach to predict lifetime of avionic hydraulic drives belongs to a priori (accelerated) methods as by its nature it does not reeuire to continue tests until a hydraulic subassembly or drive reaches its boundary value of a structural parameter. The method uses distributions of a random variable with time-dependent variance as models for lifetime prediction. Variations of structural parameters over a discretional period of time are described with use of the Gaussian distribution with the assumption that the course of the process when the structural parameters are subject to deterioration comprises the entire probabilistic characteristic that defines resistance of the hydraulic drive to a wear and tear process. In that context distributions of characteristics for variations of structural parameters were determined for a selected period of time and it served as a basis to find out parameters for the distribution of the defect-free operation time. The completed functional and design decomposition of an example avionic hydraulic drive made it possible to obtain a hierarchical description of the hydraulic drive, to identify its structural parameters that are available during the drive operation as well as to define a set of measurable out put parameters of a system, a module (a hydraulic system) and a block (a hydraulic subassembly). The set of measurable output parameters attributable to the hydraulic system in question is described with use of mathematic equations that result from fundamental equations for hydraulic systems dynamics, i.e. the mass conservation law, the principle of momentum and angular momentum conservation as well as the energy conservation law.
    Źródło:
    Journal of KONES; 2009, 16, 2; 473-484
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metody polowe oznaczania współczynnika filtracji utworów przypowierzchniowych z uwzględnieniem poprawek metodycznych na tle wstępnych wyników pomiarów stacjonarnych we Wrocławiu
    Field methods of evaluation of saturated hydraulic conductivity of near-surface soils, including correction formulas, on the background of preliminary results of stationary measurements in Wrocław
    Autorzy:
    Błachowicz, Marek
    Trałka, Marta
    Powiązania:
    https://bibliotekanauki.pl/articles/2061460.pdf
    Data publikacji:
    2019
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    współczynnik filtracji
    metoda Porcheta
    infiltrometr dwupierścieniowy
    model infiltracji
    infiltracja inicjalna
    field hydraulic conductivity
    Porchet method
    inversed auger-hole method
    double-ring infiltrometer
    infiltration model
    initial infiltration
    Opis:
    Głównym celem przedstawionej pracy jest porównanie metod polowych oznaczania współczynnika filtracji w świetle potencjalnych błędów związanych z przeszacowaniem wartości współczynnika filtracji utworów przypowierzchniowych w strefie saturacji. Są one głównie wynikiem błędnych założeń o przeprowadzeniu pomiarów w warunkach pełnego nasycenia (strefie saturacji). Przedstawiono wyniki oznaczeń zrealizowanych w serii stacjonarnych oznaczeń współczynnika filtracji metodą Porcheta oraz infiltrometru dwupierścieniowego w dłuższym horyzoncie czasowym w wybranych miejscach na obszarze Wrocławia, uwzględniających zmienność sumy opadów, ale i wykształcenie litologiczne gruntów. Wykorzystując powszechnie stosowane metody oraz narzędzia analizy i interpretacji danych, przetestowano schematy postępowania pozwalające ograniczyć błędy estymacji współczynnika filtracji.
    The main purpose of the article is to compare the field method of the estimation of hydraulic conductivity of near-surface soils on the background of potential errors related to the determination of field-saturated hydraulic conductivity (Kfs). The overestimation of Kfs value is mainly a result of wrong assumptions about measurements under full-saturation conditions (saturation zone). The article presents results of experiment carried out in a series of stationary measurements of hydraulic conductivity using selected field methods in a longer time period in selected places in the city of Wrocław, taking into account variability of precipitation and lithology of soils. Using commonly applied methods and tools of data analysis and interpretation, the schemes of procedure were tested to reduce errors of fieldsaturated hydraulic conductivity estimation.
    Źródło:
    Biuletyn Państwowego Instytutu Geologicznego; 2019, 476, Hydrogeologia z. 17; 9--15
    0867-6143
    Pojawia się w:
    Biuletyn Państwowego Instytutu Geologicznego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using 1D and 2D computer models when predicting hydrodynamic and morphological parameters of a boulder block ramp: Poniczanka stream, Carpathians
    Autorzy:
    Plesiński, Karol K.
    Radecki-Pawlik, Artur
    Rivera-Trejo, Fabian
    Powiązania:
    https://bibliotekanauki.pl/articles/2203562.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    boulder blocks ramps
    low head hydraulic structures
    field measurement
    hydraulics
    riverbed morphology
    HEC-RAS model
    CCHE2D model
    Opis:
    When modelling flow and/or sediment transport in streams and rivers, one must frequently use the computer software of differing levels of complexity. The level of sophistication, accuracy, and quality of results are the parameters by which models can be classified as being 1D, 2D, or 3D; it seems certain that in the future, there will also be 4D and 5D models. However, the results obtained from very sophisticated models are frequently questionable, and designers in the field of hydraulic structures must have considerable experience distinguishing important information from irrelevant information. Thus, this paper aims to investigate the effect of the selected boulder block ramp hydraulic structure at Poniczanka stream on the bed-load transport. We evaluated sediment transport using the CCHE2D numerical model. We analysed several scenarios depending on the river bed type (erodible, non-erodible, rocky) and examined the rock blocks used for hydraulic structure construction. The obtained results were compared with the Hjulström and the Shields graph, which are a classic approach for identifying fluvial processes in river channels. In addition to these two methods, numerical modelling using the 1D HEC-RAS (Hydrologic Engineering Center’s River Analysis System) modelling were conducted, which included the determination of horizontal and vertical changes to the river bed morphology of the examined section of river reach as well as providing the basic hydrodynamics parameters which, from the practical point of view, designers involved in the process of designing ramps could use.
    Źródło:
    Journal of Water and Land Development; 2022, Special Issue; 34--48
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geomechanical aspects of hydraulic fracture propagation in the Lublin shale gas field in Poland
    Autorzy:
    Dhital, Ch.
    Knez, D.
    Śliwa, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/299235.pdf
    Data publikacji:
    2015
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    shale gas
    hydraulic fracture simulation
    Opis:
    The recent boom in shale gas exploration around the world has sparked a paradigm shift in energy security in many countries in the world. With the successful exploration of shale gas production in the United State’s, many operators are trying to replicate the success in other parts of the world specifically in European countries where the presence of organic rich shale deposits have signaled a promising investment for the recovery of shale gas. Perspective studies for the Polish shale gas field in Poland have been ongoing. One part of this project is the comparison of hydraulic fracture thickness between the U.S shale gas field and Polish for better and effective design and modeling of reservoirs for the optimal exploration and recovery of shale gas. Successful production of natural gas from Polish basins requires a hydraulic fracture stimulation to unlock the gas trapped in the shales coupled with a geologic analysis of the shale rocks.
    Źródło:
    AGH Drilling, Oil, Gas; 2015, 32, 4; 703-711
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal-hydraulic analysis of LTS cables for the DEMO TF coil using simplifi ed models
    Autorzy:
    Lewandowska, M.
    Dembkowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/146243.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    DEMO
    tokamak
    low Tc superconductors
    toroidal field coil
    thermal-hydraulic analysis
    Opis:
    The conceptual design activities for the DEMOnstration reactor (DEMO) – the prototype fusion power plant – are conducted in Europe by the EUROfusion Consortium. In 2015, three design concepts of the DEMO toroidal field (TF) coil were proposed by Swiss Plasma Center (EPFL-SPC, PSI Villigen), Italian National Agency for New Technologies (ENEA Frascati), and Atomic Energy and Alternative Energies Commission (CEA Cadarache). The proposed conductor designs were subjected to complete mechanical, electromagnetic, and thermal-hydraulic analyses. The present study is focused on the thermal-hydraulic analysis of the candidate conductor designs using simplifi ed models. It includes (a) hydraulic analysis, (b) heat removal analysis, and (c) assessment of the maximum temperature and the maximum pressure in each conductor during quench. The performed analysis, aimed at verification whether the proposed design concepts fulfil the established acceptance criteria, provides the information for further improvements of the coil and conductors design.
    Źródło:
    Nukleonika; 2017, 62, 1; 23-28
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The operating field of a hydrostatic drive system parameters of the energy efficiency investigations of pumps and hydraulic motors
    Autorzy:
    Paszota, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/259125.pdf
    Data publikacji:
    2009
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    hydrostatic drive and control
    pumps
    hydraulic motors
    Sankey diagram
    energy efficiency
    laboratory and simulation investigations
    Opis:
    The operating field of hydrostatic drive system is presented. Subdivision of the hydraulic motor and pump work parameters into parameters independent of and dependent on the operation of displacement machines and the system is justified. A research project is proposed aimed at development of methods determining the energy characteristics of pumps and rotational hydraulic motors as well as modified methods of determining the energy characteristics of hydrostatic drive systems with selected structures of hydraulic motor speed control. The paper is an extended version of reference [11].
    Źródło:
    Polish Maritime Research; 2009, 4; 16-21
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of field tension infiltrometer data by parameter estimation
    Autorzy:
    Simunek, J.
    Wang, Dong
    Shouse, P.J.
    Van Genuchten, M.T.
    Powiązania:
    https://bibliotekanauki.pl/articles/26040.pdf
    Data publikacji:
    1998
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    field tension
    Wooding's analysis
    tension disc infiltrometer
    hydraulic property
    soil property
    parameter estimation
    Źródło:
    International Agrophysics; 1998, 12, 3
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recent tectonic stress field investigations in Poland : a state of the art
    Autorzy:
    Jarosiński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059238.pdf
    Data publikacji:
    2006
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Polska
    recent geodynamics
    tectonic stress
    borehole breakouts
    hydraulic fracturing
    modelling
    Opis:
    The paper summarizes up-to-date knowledge of the contemporary tectonic stress field in Poland and compares the results of geophysical measurements with mathematical models. The extensive set of data provided by borehole breakout analyses is supplemented by hydraulic fracturing tests, earthquake focal mechanism solutions and preliminary resolution of regional intraplate motions from GPS measurements. Frequent breakout presence shows that tectonically driven anisotropy of horizontal stress is a common feature in the study area. Roughly N-S direction of maximum horizontal stress (SHmaxx) in Eastern Poland differs significantly from Western European stress domain. This difference is produced by tectonic push of Alcapa, which is successively compensated within the Teisseyre-Tornquist Zone (TTZ) and in the Upper Silesian segment of the Outer Carpathians. In the western part of Poland stress directions are ambiguous due to interplay of several additional tectonic factors. Most of hydraulic fracturing data and earthquake focal mechanism solutions indicate strike-slip stress regime in Eastern Poland where stresses are in equilibrium with preferentially oriented faults of Iow friction (0.16). Limited data from Western Poland suggest normal fault stress regime. Good conformity between directions of 5Hm", and intraplate motions occurs from comparison of breakout and GPS data. Finite element modelling shows that the most important factor shaping the stress field in Eastern and Central Poland is the Adria push transmitted through the Pannonian region. Secondary, but still notable factors are differentiation of loads along the Mediterranean collision zone and changes in magnitude of the ridge push force along the NW Continental passive margin of Europe. Results of rheological modelling indicate that the crust is entirely decoupled from the mantle in the Fore-Sudetic Platform, partial uncoupling in the base or the upper crust is possible in the TTZ while in the East European Craton (EEC) the whole lithosphere is coupled. The comparison of different set of data and models presented here provides a comprehensive geodynamic scenario for Poland, however, a number of unresolved questions still remains to be addressed.
    Źródło:
    Geological Quarterly; 2006, 50, 3; 303-321
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of marble powder amendment on hydraulic properties of a sandy soil
    Autorzy:
    Farhadi-Machekposhti, M.
    Valdes-Abellan, J.
    Pla, C.
    Benavente, D.
    Pachepsky, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082885.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    saturated hydraulic conductivity
    soil water
    retention curve
    field capacity
    plant available water
    pore size
    distribution
    Opis:
    Marble powder is one of carbonate rock amendments that is used to improve soil reaction. We hypothesized that the powdered marble addition can cause favorable changes in hydraulic properties of sandy soils. Six levels of marble powder addition to an aridisol soil (0%; M0; 5%; M5; 10%; M10; 15%; M15; 20%; M20 and 25%, M25; by bulk volume) were analyzed in triplicate. The saturated hydraulic conductivity and soil water retention curves were obtained. Pore space properties were investigated using soil water retention curves, mercury intrusion porosimetry and scanning electron microscopy. The saturated hydraulic conductivity significantly decreased (between 83 and 97% for M5 and M25 respectively) and parameters α and n of the van Genuchten model significantly decreased in marble-amended soils. Both field capacity and permanent wilting point increased with the addition of marble powder. Plant-available water, increased significantly until 10% of marble powder application; higher percentages of application did not provide additional significant changes in the plant-available water. Pore space distributions from soil water retention curves parameters showed an increase in the pore size range and a decrease in the average pore size; pore space distribution from the scanning electron microscopy also showed the presence of a new family of dominant pore sizes which was not detected by the soil water retention curves parameters approach. It was concluded that the addition of marble powder can improve the ability of soil to store water providing an advantage for irrigation water management in water scarce environments. Further research will have to address the impact of marble powder amendment under field semi-arid conditions.
    Źródło:
    International Agrophysics; 2020, 34, 2; 223-232
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flow roughness evaluation of mobile-bed streams
    Autorzy:
    Matousek, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/62556.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
    Tematy:
    Czech Republic
    bed load
    sediment transport
    flood flow
    slurry pipe
    upper plane bed
    stream
    field measurement
    bed roughness
    flood condition
    hydraulic roughness
    Opis:
    Recent field measurements of mobile-bed roughness in selected streams in Czech Republic are described. The results are collected in a database organized to a www catalogue. The field results of the bed roughness in two gravel-bed streams under flash flood conditions are discussed. A methodology is suggested for evaluation of the bed roughness of straight channels transporting sediments. A prediction of the bed roughness under the condition of intense sediment transport in the upper plane bed regime is demonstrated on the results of laboratory pressurized-pipe tests. An application to flood conditions in a steep mountain creek is shown in a case study.
    Źródło:
    Infrastruktura i Ekologia Terenów Wiejskich; 2010, 11
    1732-5587
    Pojawia się w:
    Infrastruktura i Ekologia Terenów Wiejskich
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prace rozpoznawcze dotyczące gazu z łupków : wyniki terenowych badań środowiskowych
    Shale gas exploration : the results of environmental field studies
    Autorzy:
    Kantor, M.
    Konieczyńska, M.
    Lipińska, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075339.pdf
    Data publikacji:
    2015
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    badania terenowe
    gaz łupkowy
    wpływ środowiska
    szczelinowanie
    studnia głębinowa
    badania kompleksowe
    field studies
    shale gas
    environmental impact
    hydraulic fracturing
    well pad
    comprehensive research
    Opis:
    At the beginning of 2015 a research study, which covered the main unconventional hydrocarbon (shale gas) basins in Poland, was completed. The study was coordinated by the General Directorate for Environmental Protection. Field studies and analysis were carried out by the consortium led by Polish Geological Institute – National Research Institute, in collaboration with University of Science and Technology AGH in Cracow and Gdañsk University of Technology. Seismometric monitoring was conducted by the Central Mining Institute. The involvement of more than 60 specialists with interdisciplinary knowledge and international experience has provided high-quality results. The aim of the study was to analyze environmental impact of shale gas exploration, taking into account differentiated geological, geoenvironmental, land use, and technological data. The scope of the study included, among others: the groundwater and surface water, landscape, nature conservation forms, soil, noise and ambient air. The study was performed in 7 exploration areas around 7 different wells and included environment baseline study. The results show that there is no long-lasting, significant impact of shale gas exploration on the environment.
    Źródło:
    Przegląd Geologiczny; 2015, 63, 7; 404--409
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Field scale heterogeneity of soil structural properties in a moraine landscape of north-eastern Germany
    Autorzy:
    Koszinski, S.
    Wendroth, O.
    Lehfeldt, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/25422.pdf
    Data publikacji:
    1995
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    hydraulic conductivity
    macropore determination
    soil structure
    physical property
    crop growth
    spatial variability
    physical parameter
    morphological parameter
    Germany
    heterogeneity
    Źródło:
    International Agrophysics; 1995, 09, 3
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Possibilities of Using Hec-Ras Software For Modelling Hydraulic Conditions of Water Flow in the Fish Pass Exampled by the Pomiłowo Barrage on The Wieprza River
    Autorzy:
    Hammerling, M.
    Walczak, N.
    Walczak, Z.
    Zawadzki, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/952477.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    field measurements
    fish pass
    water table topology
    HEC-RAS
    Opis:
    The aim of the article is to analyse hydraulic conditions of water flow in a fish pass. The test facility is part of the Pomiłowo barrage in the commune of Sławno, Poland. The authors applied HEC-RAS software for modelling hydraulic parameters of the water flow in the fish pass. The data from field measurements was implemented in the software and calculations of changes in the water table in the fish pass were made. The results confirmed the usefulness of HEC-RAS software for estimating hydraulic parameters of water flow in a fish pass. HEC-RAS software enables to take into account the parameters responsible for the phenomena accompanying the flow through a fish pass. Selecting mathematical model parameters (coefficients) should be preceded by a multidimensional analysis of the facility. More precise information on hydraulics, hydrology and biology of the test fish pass are also required.
    Źródło:
    Journal of Ecological Engineering; 2016, 17, 2; 81-89
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza procesu napełniania georur na podstawie polowych i laboratoryjnych badań geotechnicznych
    Analysis of the geotubes filling process based on the field and laboratory geotechnical tests
    Autorzy:
    Smolinski, B.
    Kaczynski, L.
    Godlewski, T.
    Popielski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/40762.pdf
    Data publikacji:
    2017
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    hydrotechnika
    geosyntetyki
    georury
    napelnianie
    geotechnika
    badania geotechniczne
    hydraulic engineering
    geosynthetic
    geotube
    filling
    geotechnics
    geotechnical research
    Źródło:
    Acta Scientiarum Polonorum. Architectura; 2017, 16, 3
    1644-0633
    Pojawia się w:
    Acta Scientiarum Polonorum. Architectura
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Field experiment of destress hydraulic fracturing for controlling the large deformation of the dynamic pressure entry heading adjacent to the advancing longwall face
    Badania terenowe nad procesem odprężania przy szczelinowaniu hydraulicznym w celu zapobiegania powstawaniu odkształceń pod wpływem ciśnienia eksploatacyjnego w chodnikach sąsiadujących z wyrobiskiem ścianowym
    Autorzy:
    Huang, Bingxiang
    Zhao, Xinglong
    Ma, Jian
    Sun, Tianyuan
    Powiązania:
    https://bibliotekanauki.pl/articles/218762.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    chodnik sąsiadujący bezpośrednio z eksploatowanym wyrobiskiem ścianowym
    ciśnienie dynamiczne w chodniku
    odkształcenia
    szczelinowanie kierunkowe
    przemieszczenie oddziaływania naprężeń
    entry heading adjacent advancing coal face
    dynamic pressure entry
    large deformation
    directional hydraulic fracturing
    stress transfer
    Opis:
    Influenced by the dynamic pressure of the front abutment pressure and the lateral abutment pressure, large deformation of surrounding rock occurs advancing working face in the entry heading adjacent to the active longwall mining face. Based on the cause analysis of entry large deformation, a new technology was put forward to solve the problem, and the designing method of drilling hole parameters for directional hydraulic fracturing was formed. Holes are drilled in the entry or in the high drainage entry to a certain rock layer over the adjacent working face, hydraulic cutting or slotting at the bottom of a borehole were also applied in advance to guide the hydraulic fractures extend in expected direction, through which the hard roof above the coal pillar can be cut off directionally. As a result, the stress concentration around the entry was transferred, and the entry was located in a destressing area. The field test at Majialiang coal mine indicates that the propagation length of cracks in single borehole is more than 15 m. After hydraulic fracturing, the large deformation range of the entry is reduced by 45 m, the average floor heave is reduced by 70%, and the average convergence of the entry’s two sides is reduced by 65%. Directional hydraulic fracturing has a better performance to control the large deformation of the dynamic pressure of the entry heading adjacent to the advancing coal face. Besides, it can improve the performance of the safety production.
    Gwałtowne zmiany ciśnienia eksploatacyjnego prowadzić mogą do znacznych odkształceń skał otaczających ścianę wydobywczą oraz pobliskich odcinków chodników. W oparciu o analizę przyczyn powstawania tego typu odkształceń, opracowano nową technologię w celu rozwiązania problemu i zaproponowano metodę odpowiedniego projektowania otworów wiertniczych dla kierunkowego prowadzenia operacji szczelinowania hydraulicznego. Otwory wiercone są w chodniku głównym i w chodniku odprowadzającym docierając na głębokość aż do warstwy skalnej bezpośrednio sąsiadującej z eksploatowanym wyrobiskiem. Proponuje się również wykonanie nacięć lub żłobień w dolnej części otworu tak, by skutecznie kontrolować proces powstawania i propagacji szczelin i nadać im pożądany przebieg, w ten sposób umożliwiając kierunkowe wrębienie stropu. W rezultacie punkt koncentracji naprężeń wokół chodnika zostaje przemieszczony, zaś sam chodnik znajdzie się w strefie odprężania. Badania terenowe prowadzone w kopalni węgla Majialiang wykazały, że długość propagujących szczelin w pojedynczym otworze wyniosła 15 m. Po zakończeniu szczelinowania hydraulicznego, zakres odkształceń chodnika zredukowano o 45 m, zaś średnie pęcznienie spągu zmniejszyło się o 70%; średnia konwergencja warstw skalnych z dwóch stron chodnika zmniejszyła się o 65%. Szczelinowanie kierunkowe umożliwia skuteczniejsze zapobieganie powstawaniu odkształceń pod wpływem ciśnienia dynamicznego w chodniku sąsiadującym bezpośrednio z eksploatowanym wyrobiskiem ścianowym . Ponadto, metoda ta przyczynia się do poprawy bezpieczeństwa pracy.
    Źródło:
    Archives of Mining Sciences; 2019, 64, 4; 829-848
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Krzyżacki przekop w rejonie rzek Wel i Wkra pod Lidzbarkiem. Konfrontacja dawnej i nowej historiografii z badaniami terenowymi
    Teutonic ditch in the area of the Wel and Wkra rivers near Lidzbark. Confrontation of old and new historiography with field research
    Autorzy:
    Główczyński, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/27316308.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
    Tematy:
    Wel river
    Wkra river
    border of Masovia
    Teutonic Knights
    hydraulic engineering
    Welski Landscape Park
    Wel
    Wkra
    granica Mazowsza
    Krzyżacy
    prace hydrotechniczne
    Welski Park Krajobrazowy
    Opis:
    Every so often we witness a return of a hitherto unresolved topic about the hydraulic engineering works conducted by the Teutonic Knights in the vicinity of Lidzbark. There are several opinions concerning the location of and reasons for their endeavor. There is original documentation in Latin from the mid-14th century with a reference to the approximate location of the works. Subsequent information on this subject appeared at the end of the 19th century. On the basis of contemporary geological studies, the author tries to refute the thesis that the Teutonic Knights dug a trench from Cibórz to Lidzbark, thus connecting two rivers called Wel and Wkra. The presumed 14th-century construction is a watercourse from the Wel River in Bełk (below Cibórz) to Turza Mała and the Płośniczanka River. The Wel river was called Vcra (1260); Wykara (1303), Welle (1600), or Wkra (1945), while on the Henneberger map from 1600, the Płośniczanka river was called Wellefl uss, and the changes in its course are most visible in the vicinity of the Koty village. Presumably there was a translation error: the Teutonic Knights made a ditch in the vicinity of Cibórz and released water to Lidzbark, which was interpreted as: ‘The Teutonic Knights made a ditch from Cibórz to Lidzbark’. Contemporary geological studies and maps exclude the possibility of connecting the Wel and Wkra rivers in the Middle Ages, while in the Holocene, there was a natural connection, the trace of which is the old riverbed called Martwica. The article describes the present physical state of the area in the Lubawa region.
    Źródło:
    Kwartalnik Historii Nauki i Techniki; 2022, 67, 3; 25--42
    0023-589X
    2657-4020
    Pojawia się w:
    Kwartalnik Historii Nauki i Techniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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