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  • 1
    Online Resource
    Online Resource
    Vegetation changes as indicators of landfill leachate seepage locations: Case study
    Elsevier BV ; 2022
    In:  Ecological Engineering Vol. 174 ( 2022-01), p. 106448-
    Details
    In: Ecological Engineering, Elsevier BV, Vol. 174 ( 2022-01), p. 106448-
    Type of Medium: Online Resource
    ISSN: 0925-8574
    URL: Article
    DOI: 10.1016/j.ecoleng.2021.106448
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2022
    detail.hit.zdb_id: 1127407-4
    SSG: 12
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  • 2
    Online Resource
    Online Resource
    A Study of Assessment and Prediction of Water Quality Index Using Fuzzy Logic and ANN Models
    MDPI AG ; 2022
    In:  Sustainability Vol. 14, No. 9 ( 2022-05-07), p. 5656-
    Details
    In: Sustainability, MDPI AG, Vol. 14, No. 9 ( 2022-05-07), p. 5656-
    Abstract: Various human activities have been the main causes of surface water pollution. The uneven distribution of industrial enterprises in the territories of the main river basins of Ukraine do not always allow the real state of the water quality to be assessed. This article has three purposes: (1) the modification of the Ukrainian method for assessing the WQI, taking into account the level of negative impact of the most dangerous chemical elements, (2) the modeling of WQI assessment using fuzzy logic and (3) the creation of an artificial neural network model for the prediction of the WQI. The fuzzy logic model used four input variables and calculated one output variable (WQI). In the final stage of the study, six ANN models were analyzed, which differed from each other in various loss function optimizers and activation functions. The optimal results were shown using an ANN with the softmax activation function and Adam’s loss function optimizer (MAPE = 9.6%; R2 = 0.964). A comparison of the MAPE and R2 indicators of the created ANN model with other models for assessing water quality showed that the level of agreement between the forecast and target data is satisfactory. The novelty of this study is in the proposal to modify the WQI assessment methodology which is used in Ukraine. At the same time, the phased and joint use of mathematical tools such as the fuzzy logic method and the ANN allow one to effectively evaluate and predict WQI values, respectively.
    Type of Medium: Online Resource
    ISSN: 2071-1050
    URL: Article
    DOI: 10.3390/su14095656
    Language: English
    Publisher: MDPI AG
    Publication Date: 2022
    detail.hit.zdb_id: 2518383-7
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  • 3
    Online Resource
    Online Resource
    DURABILITY TESTS OF GEOSYNTHETIC MATERIALS USED IN DIFFICULT ENVIRONMENTAL CONDITIONS
    Warsaw University of Life Sciences - SGGW Press ; 2023
    In:  Acta Scientiarum Polonorum. Architectura Vol. 22 ( 2023-07-26), p. 50-57
    Details
    In: Acta Scientiarum Polonorum. Architectura, Warsaw University of Life Sciences - SGGW Press, Vol. 22 ( 2023-07-26), p. 50-57
    Abstract: The article describes the ageing process of high-density polyethylene (HDPE) geogrids under the influence of chemical and environmental factors. Research on accelerated ageing of a uniaxial HDPE geogrid incubated in a water solution for a period of 12 months is presented. Three temperatures (25°, 45° and 75°C) were selected for the accelerated ageing tests in aqueous solutions simulating the conditions at a municipal waste landfill. Changes were observed using differential scanning calorimetry (DSC), and correlations with the mechanical properties of the aged geogrid were checked. No significant effect of the loss of antioxidant in the material on the mechanical properties of the uniaxial geogrid was observed. The tests made it possible to determine the mechanical properties, such as tensile strength and deformability of the geogrid – which are extremely important in the analysis of slope stability.
    Type of Medium: Online Resource
    ISSN: 2544-1760 , 1644-0633
    URL: Article
    DOI: 10.22630/ASPA.2023.22.6
    Language: Unknown
    Publisher: Warsaw University of Life Sciences - SGGW Press
    Publication Date: 2023
    detail.hit.zdb_id: 2912163-2
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  • 4
    Online Resource
    Online Resource
    Badania wpływu przyspieszonego starzenia na parametry mechaniczne georusztu PEHD stosowanego na składowiskach odpadów
    Wydawnictwo SIGMA-NOT, sp. z.o.o. ; 2018
    In:  PRZEMYSŁ CHEMICZNY Vol. 1, No. 8 ( 2018-8-5), p. 155-158
    Details
    In: PRZEMYSŁ CHEMICZNY, Wydawnictwo SIGMA-NOT, sp. z.o.o., Vol. 1, No. 8 ( 2018-8-5), p. 155-158
    Type of Medium: Online Resource
    ISSN: 0033-2496
    URL: Article
    DOI: 10.15199/62.2018.8.21
    Language: English
    Publisher: Wydawnictwo SIGMA-NOT, sp. z.o.o.
    Publication Date: 2018
    detail.hit.zdb_id: 979803-1
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  • 5
    Online Resource
    Online Resource
    Effect of the Impact of Chemical and Environmental Factors on the Durability of the High Density Polyethylene (HDPE) Geogrid in a Sanitary Landfill
    MDPI AG ; 2016
    In:  Applied Sciences Vol. 7, No. 1 ( 2016-12-23), p. 22-
    Details
    In: Applied Sciences, MDPI AG, Vol. 7, No. 1 ( 2016-12-23), p. 22-
    Abstract: A high density polyethylene (HDPE) uniaxial geogrid was exhumed after twenty years of service in a sanitary landfill, and its properties were examined. A geogrid installed in a landfill is exposed to mechanical and chemical factors (e.g., a wide pH range and high temperatures), as well as different weather conditions. This paper presents the results of physical and mechanical analyses of virgin and aged HDPE geogrid samples. Structural changes observed by differential scanning calorimetry and Fourier transform infrared spectroscopy (FT-IR) spectroscopy correlate with the mechanical properties of the aged geogrid. The mechanical properties were found to have changed only slightly. In the FT-IR spectrum of the topmost layer of the aged geogrid samples, no significant changes were observed compared to the spectrum of the top layer of the virgin samples. This indicates the strong chemical resistance of the HDPE material, which is able to withstand environmental conditions for at least 20 years of service in a landfill.
    Type of Medium: Online Resource
    ISSN: 2076-3417
    URL: Article
    DOI: 10.3390/app7010022
    Language: English
    Publisher: MDPI AG
    Publication Date: 2016
    detail.hit.zdb_id: 2704225-X
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  • 6
    Online Resource
    Online Resource
    Landfill Slope Stability Improvement Incorporating Reinforcements in Reclamation Process Applying Observational Method
    MDPI AG ; 2020
    In:  Applied Sciences Vol. 10, No. 5 ( 2020-02-25), p. 1572-
    Details
    In: Applied Sciences, MDPI AG, Vol. 10, No. 5 ( 2020-02-25), p. 1572-
    Abstract: This paper concerns a case study presenting one of the biggest landfills in Poland that required application of complex engineering works to extend the deposing capacity of the structure. The shear strength parameters of the subsoil and waste material used for analyses were based on geotechnical investigation and were then applied in slope stability analyses of the landfill. For the purpose of safety management of the new development and reclamation plan for the landfill, an observational method was applied to increase the geotechnical safety of the structure. The slope reinforcement methods mainly included the geogrid, geocomposite, and berms construction. However, much of the uncertainty associated with the stability of the geogrid-reinforced slope is related to the time-dependent deformation of geosynthetic materials. For the purpose of changes in the geogrid parameters with time, the samples were excavated from the landfill slope after 20 years of exploitation and analyzed in the laboratory. The tests allowed precise determination of the material properties, changing geometry, and mechanical properties like tensile strength and strain. Obtained results were compared to parameters of the brand-new geogrid samples. The tests indicated only insignificant changes in geosynthetics, physical, or mechanical performance properties, and the slope has not been compromised in its stability or performance.
    Type of Medium: Online Resource
    ISSN: 2076-3417
    URL: Article
    DOI: 10.3390/app10051572
    Language: English
    Publisher: MDPI AG
    Publication Date: 2020
    detail.hit.zdb_id: 2704225-X
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  • 7
    Online Resource
    Online Resource
    Predicting the Influence of Ammonium Toxicity Levels in Water Using Fuzzy Logic and ANN Models
    MDPI AG ; 2024
    In:  Sustainability Vol. 16, No. 14 ( 2024-07-09), p. 5835-
    Details
    In: Sustainability, MDPI AG, Vol. 16, No. 14 ( 2024-07-09), p. 5835-
    Abstract: The study aimed to address the complex and critical issue of surface water quality monitoring by proposing a diversified approach that incorporates a range of chemical indicators. (1) Background: the purpose of the study was to address the problem of surface water quality monitoring in relation to the toxic effects of ammonium on aquatic ecosystems by developing predictive models using fuzzy logic and artificial neural networks. (2) Water samples from the Styr River, influenced by the Rivne Nuclear Power Plant, were analyzed using certified standard methods and measured parameters, while fuzzy logic and artificial neural network models, including Mamdani’s algorithm and various configurations of activation functions and optimization algorithms, were employed to assess water quality and predict ammonium toxicity. (3) A fuzzy logic system was developed to classify water quality based on ammonia content and other parameters, and six Artificial Neural Network (ANN) models were tested, with the ANN#2 model (using ReLU activation and ADAM optimizer) showing the best performance. (4) This study emphasizes the critical need for precise monitoring and modeling of total ammonium in surface water, considering its variable toxicity and interactions with environmental factors, to effectively protect aquatic ecosystems, namely ichthyofauna.
    Type of Medium: Online Resource
    ISSN: 2071-1050
    URL: Article
    DOI: 10.3390/su16145835
    Language: English
    Publisher: MDPI AG
    Publication Date: 2024
    detail.hit.zdb_id: 2518383-7
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  • 8
    Online Resource
    Online Resource
    The Influence of the Accelerated Aging Conditions on the Properties of Polyolefin Geogrids Used for Landfill Slope Reinforcement
    MDPI AG ; 2020
    In:  Polymers Vol. 12, No. 9 ( 2020-08-20), p. 1874-
    Details
    In: Polymers, MDPI AG, Vol. 12, No. 9 ( 2020-08-20), p. 1874-
    Abstract: Polyolefin geosynthetics are susceptible to oxidative degradation, which in turn leads to diminished mechanical properties in geotechnical constructions. When using these materials, it is extremely important to determine their durability over time in particularly aggressive conditions. In order to prolong the life of a geosynthetic material, antioxidants are added during the manufacturing process. The function of antioxidants is to prevent polymer oxidation reaction in time. As the antioxidant content is depleted, the polymer becomes less protected towards oxidative attacks. This article describes the aging process of uniaxial (high density polyethylene) HDPE geogrids under the influence of chemical and environmental factors. Evaluations of accelerated aging test of the uniaxial HDPE geogrids were incubated in simulated landfill conditions for a period of 12 months. Three temperatures (25 °C, 45 °C, and 75 °C) were selected for carrying out the aging experiments in aqueous solutions mimicking landfill conditions. The changes observed by differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR) and melt flow index (MFI) correlate with the mechanical properties of the aged geogrid. No significant changes in the FTIR and MFI were observed over the 12 months of accelerated aging tests at none of the three different temperatures. The oxidation induction time (OIT) test showed no antioxidant remaining in the geogrid following eight months of aging test at 75 °C. No significant changes in the influence of accelerated aging tests on the average relative elongation at 25 °C and 45 °C of the tested material were observed. Accelerated aging tests at 75 °C showed that the mean elongation of 12.12% for the sample not subjected to accelerated aging tests (new sample) increased to 19.32% (after 12 months of incubation).
    Type of Medium: Online Resource
    ISSN: 2073-4360
    URL: Article
    DOI: 10.3390/polym12091874
    Language: English
    Publisher: MDPI AG
    Publication Date: 2020
    detail.hit.zdb_id: 2527146-5
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  • 9
    Online Resource
    Online Resource
    The application of hexagonal geogrid as a reinforcement element of the base of a road embankment
    Warsaw University of Life Sciences - SGGW Press ; 2023
    In:  Acta Scientiarum Polonorum. Architectura Vol. 22 ( 2023-11-17), p. 102-109
    Details
    In: Acta Scientiarum Polonorum. Architectura, Warsaw University of Life Sciences - SGGW Press, Vol. 22 ( 2023-11-17), p. 102-109
    Abstract: For stability calculations, one of the most important factors is the strength of the material used in the role of reinforcement. In the case of hexagonal geogrids, strength results can be obtained according to the manufac-turer’s recommendations – radially tensile or in accordance with the standard – using the wide-width strip specimen tensile method. It was decided to compare the strength results obtained using the radial stiffness to those resulting from tests conducted according to the standard. This article presents the utilisation of geosyn-thetic materials, specifically hexagonal geogrids, as reinforcement elements for soil. The article showcases the methodology and results of strength tests conducted on samples of hexagonal geogrids using the wide-width specimen method, as well as stability analysis of a representative road embankment using the afore-mentioned geogrid. The objective of the research was to determine the strength parameters for stability calcu-lations of the embankment. The obtained parameters were compared with the manufacturer’s specifications.
    Type of Medium: Online Resource
    ISSN: 2544-1760 , 1644-0633
    URL: Article
    DOI: 10.22630/ASPA.2023.22.11
    Language: Unknown
    Publisher: Warsaw University of Life Sciences - SGGW Press
    Publication Date: 2023
    detail.hit.zdb_id: 2912163-2
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  • 10
    Online Resource
    Online Resource
    Sustainability of Geosynthetics-Based Solutions
    MDPI AG ; 2023
    In:  Environments Vol. 10, No. 4 ( 2023-04-10), p. 64-
    Details
    In: Environments, MDPI AG, Vol. 10, No. 4 ( 2023-04-10), p. 64-
    Abstract: Sustainability emphasises the importance of increasing the resource efficiency of infrastructure. The usage of geosynthetic materials in civil and environmental engineering can significantly influence sustainability at the planning and design stages of infrastructure construction projects. They are used in many different applications in construction and environmental engineering, as they provide a better and longer performance and less costly solutions than traditional materials (such as sand, gravel, concrete and cement). Additional benefits can be achieved by combining geosynthetics with various recycled materials as substitutes for high-quality natural materials. In this paper, the importance of sustainability in geosynthetics-based solutions is discussed. The possibilities of using geosynthetics in sustainable development have been analysed and the benefits resulting from their application, such as the reduction in carbon footprint and release of greenhouse gases and saving water and other natural resources, have been assessed. Innovative solutions that support mitigation measures, adaptation to climate change and achievement of sustainable development goals have been presented.
    Type of Medium: Online Resource
    ISSN: 2076-3298
    URL: Article
    DOI: 10.3390/environments10040064
    Language: English
    Publisher: MDPI AG
    Publication Date: 2023
    detail.hit.zdb_id: 2777960-9
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