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Wyszukujesz frazę "Observational Method" wg kryterium: Temat


Wyświetlanie 1-7 z 7
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:
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:
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:
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:
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
    Wyświetlanie 1-7 z 7

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