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    Wyświetlanie 1-9 z 9
    Tytuł:
    Displacement monitoring and sensitivity analysis in the observational method
    Autorzy:
    Górska, K.
    Muszyński, Z
    Rybak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/178242.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    monitoring
    metoda obserwacyjna
    analiza wrażliwości
    observation method
    sensitivity analysis
    Opis:
    This work discusses the fundamentals of designing deep excavation support by means of observational method. The effective tools for optimum designing with the use of the observational method are both inclinometric and geodetic monitoring, which provide data for the systematically updated calibration of the numerical computational model. The analysis included methods for selecting data for the design (by choosing the basic random variables), as well as methods for an on-going verification of the results of numeric calculations (e.g., MES) by way of measuring the structure displacement using geodetic and inclinometric techniques. The presented example shows the sensitivity analysis of the calculation model for a cantilever wall in non-cohesive soil; that analysis makes it possible to select the data to be later subject to calibration. The paper presents the results of measurements of a sheet pile wall displacement, carried out by means of inclinometric method and, simultaneously, two geodetic methods, successively with the deepening of the excavation. This work includes also critical comments regarding the usefulness of the obtained data, as well as practical aspects of taking measurement in the conditions of on-going construction works.
    Źródło:
    Studia Geotechnica et Mechanica; 2013, 35, 3; 25-43
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preliminary field tests and long-term monitoring as a method of design risk mitigation: a case study of Gdańsk Deepwater Container Terminal
    Autorzy:
    Miśkiewicz, M.
    Mitrosz, O.
    Brzozowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/258698.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    monitoring
    field test
    Observational Method
    CFA piles
    micropiles
    geotechnics
    Opis:
    Appropriate risk assessment plays a fundamental role in the design. . The authors propose a possible method of design risk mitigation, which follows recommendations included in Eurocode 7. The so-called “Observational Method” (OM) can produce savings in costs and programmes on engineering projects without compromising safety. The case study presented is a complex design solution that deals with the heavy foundations of a gantry crane beam as one of the elements of a Deepwater Container Terminal extension. The paper presents a detailed process of the design of the rear crane beam being a part of the brand new berth, together with its static analysis, as well as the long-term results of observations, which have revealed the real performance of the marine structure. The case presented is based on excessive preliminary field tests and technical monitoring of the structure, and is an example of a successful OM implementation and design risk mitigation.
    Źródło:
    Polish Maritime Research; 2017, 3; 106-114
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical analysis of tailing dam with calibration based on genetic algorithm and geotechnical monitoring data
    Autorzy:
    Grosel, Szczepan
    Powiązania:
    https://bibliotekanauki.pl/articles/1845160.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    soil parameters
    optimization
    slope stability
    genetic algorithm
    observational method
    monitoring
    Opis:
    The article presents a method of calibration of material parameters of a numerical model based on a genetic algorithm, which allows to match the calculation results with measurements from the geotechnical monitoring network. This method can be used for the maintenance of objects managed by the observation method, which requires continuous monitoring and design alterations. The correctness of the calibration method has been verified on the basis of artificially generated data in order to eliminate inaccuracies related to approximations resulting from the numerical model generation. Using the example of the tailing dam model the quality of prediction of the selected measurement points was verified. Moreover, changes of factor of safety values, which is an important indicator for designing this type of construction, were analyzed. It was decided to exploit the case of dam of reservoir, which is under continuous construction, that is dam height is increasing constantly, because in this situation the use of the observation method is relevant.
    Źródło:
    Studia Geotechnica et Mechanica; 2021, 43, 1; 34-47
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metoda obserwacyjna i monitoring geotechniczny w świetle przepisów prawa do oceny zachowania podłoża i konstrukcji inżynierskich
    The observational method and the geotechnical monitoring in law to assess subsoil and construction conditions
    Autorzy:
    Borecka, A.
    Stopkowicz, A.
    Sekuła, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075703.pdf
    Data publikacji:
    2017
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    monitorowanie geotechniczne
    metoda obserwacyjna
    OM
    analiza prawodawstwa
    Eurokod 7
    inżynieria drogowa
    inżynieria autostradowa
    geotechnical monitoring
    observational method
    analysis of legislation
    Eurocode 7
    road engineering
    Opis:
    The observational method is one of the designing methods specified in Eurocode 7. It is recommended when the subsoil behavior prediction is difficult. Geotechnical monitoring is an integral part of the observational method. It can be also used for evaluation of subsoil and/or construction conditions at every investment stage. The article presents compulsory law regulation, standards and literature analysis in terms of using the observational method and geotechnical monitoring.
    Źródło:
    Przegląd Geologiczny; 2017, 65, 10/2; 685--691
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Philosophy of geotechnical design in civil engineering – possibilities and risks
    Autorzy:
    Bogusz, W.
    Godlewski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/201783.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Eurocode 7
    geotechnical engineering
    limit state design
    observational method
    reliability
    risk management
    Eurokod 7
    inżynieria geotechniczna
    metoda obserwacyjna
    niezawodność
    zarządzanie ryzykiem
    Opis:
    The European standards, developed extensively over last 30 years, are driven by the need for continuous evolution and their Authors’ pursuit of better EU-wide quality in civil engineering – combining safety, economy, and sustainable development. The adoption of theory of reliability as the basis for design has played a major role in shaping current geotechnical practice. However, it requires from practitioners a greater understanding of underlying uncertainties. Furthermore, a number of alternative approaches, not generally used in structural design, are also allowed, as some situations in geotechnical engineering require an individual approach. Moreover, the current trends in geoengineering increase the importance of risk assessment and management. The paper presents general philosophy guiding the geotechnical design and pointing to some of the ideas introduced by Eurocode 7 and its requirements, in relation to preexisting practice of geotechnical design in civil engineering.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 2; 289-306
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of the observational tunnels method to select a set of features sufficient to identify a type of coal
    Autorzy:
    Jamroz, D.
    Niedoba, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/109317.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    multidimensional statistical analysis
    observational tunnels method
    coal
    image visualization
    energetic materials
    Opis:
    Coal is a material which has many features deciding about its quality. Among them, the decisive ones are mainly ash contents, sulfur contents and combustion heat. The paper presents the investigation of coal characteristics of three selected coal types in the context of their energetic value. For this purpose samples were collected from three different Polish mines: coal types 31, 34.2 and 35 (Polish classification of coals). Each of these materials was separated into particle size fractions (9 fractions) and then into 8 density fractions by separation in heavy liquids. For each size-density fractions obtained in this way, chemical analyses were performed which allowed for determination of such features as combustion heat, sulfur contents, ash contents, volatile parts contents and analytical moisture. Altogether, seven dimensions of grained material characteristics were obtained. The data prepared in this way was subsequently analyzed for correlation with the purpose of determining significant relations between investigated features. It was stated that the most correlated coal features are density, combustion heat, ash contents and volatile parts contents. For multidimensional analysis and identification of coal type, the modern image visualization technique, the Observational Tunnels Method, was applied. After performing seven-dimensional analysis aimed at the proper recognition of coal type, it was decided to determine the minimum amount of random variables, which describe a particular material in order to identify its type. It was stated that the crucial coal identification parameter is “analytical moisture”. Due to existing correlation between individual features, three of them were selected for testing: analytical moisture, sulfur contents and volatile parts contents. On the basis of the obtained images, it was stated that it was possible to obtain a view with the data concerning each type of coal being located in other part of the space. Subsequently, it was checked if a similar result is possible when the parameter “volatile parts contents” is replaced with highly correlated parameters “combustion heat” and “ash contents”. In both cases the exchange of these variables did not produce good enough results. This can be explained by a different scale of empirical data making it impossible to obtain a clear multidimensional image for which all three types of coal would be located in other parts of space. However, it was proved that the modern graphical and computer methods can be successfully applied to identify the types of particulate materials.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2014, 50, 1; 185-202
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of selected methods of multi-parameter data visualization used for classification of coals
    Autorzy:
    Jamroz, D.
    Niedoba, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/110329.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    multidimensional visualization
    observational tunnels method
    multidimensional scaling
    MDS
    principal component analysis
    PCA
    relevance maps
    autoassociative neural networks
    Kohonen maps
    parallel coordinates method
    grained material
    coal
    Opis:
    Methods of multi-parameter data visualization through the transformation of multidimensional space into two-dimensional one allow to present multidimensional data on computer screen, thus making it possible to conduct a qualitative analysis of this data in the most natural way for human – by a sense of sight. In the paper a comparison was made to show the efficiency of selected seven methods of multidimensional visualization and further, to analyze data describing various coal type samples. Each of the methods was verified by checking how precisely a coal type can be classified when a given method is applied. For this purpose, a special criterion was designed to allow an evaluation of the results obtained by means of each of these methods. Detailed information included presentation of methods, elaborated algorithms, accepted parameters for best results as well the results. The framework for the comparison of the analyzed multi-parameter visualization methods includes: observational tunnels method multidimensional scaling MDS, principal component analysis PCA, relevance maps, autoassociative neural networks, Kohonen maps and parallel coordinates method.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2015, 51, 2; 769-784
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    DEVELOPMENT OF A QUANTITATIVE SCORING METHOD FOR STROBE CHECKLIST
    Autorzy:
    Limaye, Dnyanesh
    Limaye, Vaidehi
    Pitani, Ravi Shankar
    Fortwengel, Gerhard
    Sydymanov, Arlan
    Otzipka, Christian
    Ziesenis, Patrick
    Powiązania:
    https://bibliotekanauki.pl/articles/895270.pdf
    Data publikacji:
    2018-10-31
    Wydawca:
    Polskie Towarzystwo Farmaceutyczne
    Tematy:
    STROBE
    STROBE-M
    observational studies
    publication quality
    scoring method
    Opis:
    Background: Evidence-based medicine (EBM) has brought a substantial change in medical practice. Strengthening the Reporting of Observational Studies in Epidemiology (STORBE) guidelines do not have a method to assign quality score to observational study publications which might lead to differences in assessing quality of publication. A scoring method can provide quantitative estimates that could improve quality of reporting, eventual conduct of observational studies and can lead to more transparent judgements about the quality of evidence. Objectives:To develop a quantitative scoring method for STROBE checklist and to design a rating scale in order to categorize epidemiological study publications into excellent, good, fair, poor quality based on the overall scores. Methods:STROBE-M (STROBE Modified) checklist was developed by dividing composite STROBE items into multiple items for ease of comprehension and scoring. For each item, we decided to have 3 quality scores option i.e. 0 (not fulfilled), 1 (fulfilled) and NA (not applicable). STROBE-M adherence scoring method was developed to assign quality scores to study publications. Results: Cross sectional studies had 40% good and 60% fair; case control studies had 7% good and 93% excellent; cohort studies had 100% study publications with excellent grade as per STROBE-M scoring. Cross sectional studies had overall fair STROBE-M adherence grade while case control studies and cohort studies had excellent grade. Conclusion: This study highlighted deficiencies in the reporting of observational studies. Based on our experience, the STROBE-M checklist seems to be a useful tool for assessing the reporting quality of the observational studies.
    Źródło:
    Acta Poloniae Pharmaceutica - Drug Research; 2018, 75, 5; 1095-1106
    0001-6837
    2353-5288
    Pojawia się w:
    Acta Poloniae Pharmaceutica - Drug Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quantile estimation of probability distributions for maximum daily precipitation and short time series of observational data for engineering design
    Autorzy:
    Kuchar, Leszek
    Broszkiewicz-Suwaj, Ewa
    Powiązania:
    https://bibliotekanauki.pl/articles/2057626.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    stochastic method
    daily precipitation
    Pareto law
    metoda stochastyczna
    opad dobowy
    prawo Pareto
    Opis:
    Knowledge of the distribution quantiles of precipitation maximum amounts is required in many fields concerning engineering design or hydrological risk assessment. When the number of observation years is small, it is not possible to fit the probability distribution function to maximum values and to calculate quantiles. This paper presents a procedure for calculating the quantiles of the probability distribution of daily precipitation maximums over a year using stochastic convergence of distributions. The distribution series of random variables, defined based on the cut-off sample with the elimination of the smallest values, made it possible to determine the quantiles for times series of order α of the distribution. These values were approximated by a function from the exponential class and then extrapolated to obtain quantiles for the distribution of maxima. The resulting quantile estimates, for short time series, were corrected using the kurtosis of the data used for estimation, which leads to a very large error reduction.
    Źródło:
    Environment Protection Engineering; 2022, 48, 1; 35--50
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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