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Tytuł:
Wykorzystanie narzędzia zarządzania jakością jakim jest Diagram Ishikawy na przykładzie małego przedsiębiorstwa kaletniczego
Use the quality management tool, which is the Ishikawa Diagram on the example of a small leather business
Autorzy:
Chądzyńska, M.
Klimecka-Tatar, D.
Powiązania:
https://bibliotekanauki.pl/articles/108979.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
diagram Ishikavy
metody zarządzania jakością
metoda 5M
jakość
Diagram Ishikavy
quality management methods
method 5M
quality
Opis:
Wykorzystanie narzędzia zarządzania jakością jakim jest Diagram Ishikavy w małej firmie kaletniczej pozwala na przeprowadzenie dokładnej analizy. Dotyczy ona uszeregowania występujących przyczyn niezgodności oraz tego jakie powiązania panują między nimi. Problemy występujące w firmie pogrupowane zostały w oparciu o zasadę 5M. Zastosowanie Diagramu Ishikavy znacząco ułatwia przedsiębiorstwu znalezienie przyczyn występujących niezgodności oraz tego w jaki sposób są one ze sobą powiązane. Dzięki temu jest ono w stanie zapobiegać występującym problemom.
Using a quality management tool such as Ishikavy Diagram in a small leather company allows to carry out a preliminary quality analysis. It concerns on the ranking of the nonconformity causes and the relationships between them. The problems in the company have been grouped on the basis of the 5M rule. The use of the Ishikavy Diagram significantly facilitates the company's understanding of the nonconformities causes and help to prevent problems.
Źródło:
Archiwum Wiedzy Inżynierskiej; 2017, 2, 1; 20-22
2544-2449
Pojawia się w:
Archiwum Wiedzy Inżynierskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie transopcji szczelinowej w testowaniu parametrow pracy pulsatorow
Autorzy:
Lipinski, M
Powiązania:
https://bibliotekanauki.pl/articles/797734.pdf
Data publikacji:
1994
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
Pulsotron 5M
pulsatory
dojarki mechaniczne
transopcja szczelinowa
przyrzady pomiarowe
diagnostyka
Opis:
A new way of testing and a sensor for measuring parameters of pulsators’ performance were invented at Poznań Agricultural University. The prototype of the device works very well, and its precision is comparable with a Swiss Milko Test 2000 apparatus.
W poznańskiej Akademii Rolniczej dokonano wynalazku, którego istota polega na wykorzystaniu w pomiarach podciśnienia dwóch transoptorów szczelinowych, transformujących pneumatyczne impulsy pulsatora na sygnały elektryczne, przetwarzane dalej przez układ mikroprocesorowy, wyświetlający obliczone parametry pracy pulsatora, przewidziane przez normy ISO.
Źródło:
Zeszyty Problemowe Postępów Nauk Rolniczych; 1994, 416; 217-222
0084-5477
Pojawia się w:
Zeszyty Problemowe Postępów Nauk Rolniczych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implementation of Fishbone Diagram by cause & effect analysis for construction projects
Wdrożenie diagramu rybiej ości poprzez analizę przyczynowo-skutkową dla projektów budowlanych
Autorzy:
Kaya, Burak Ozan
Powiązania:
https://bibliotekanauki.pl/articles/24085329.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
Fishbone Diagram
construction
construction project management
quality management
Ishikawa diagram
5M’s
diagram rybiej ości
konstrukcja
zarządzanie projektem budowlanym
zarządzanie jakością
diagram Ishikawy
5M
Opis:
This study aims to practice the implementation of the Fishbone Diagram for Cause & Effect Analysis and prove the validity of the technique’s usability in any construction project to increase productivity for both construction managers and engineers. In every sub-branch of the given Fishbone Diagram, possible failures might be expected to occur unless necessary precautions are taken. The failures, emerge as significant problems and range from possible delays to product quality deficiencies which would affect the acceptance of the project from customers. During the creation of the Fishbone Diagram, the obtained results show us that possible delays are co-existing among each of the 5 M's. Fishbone Diagram in the study also points out there are common issues and similarities between Men and Machine since both 2 M’s lead to progress in a construction project and are interdependent. As a result of this study, usage of Fishbone Diagram Technique demonstrated the possible connections between M’s and determination of the Cause & Effect relations in a construction project. Findings of this study proved that usage of Cause & Effect Analysis in construction projects is also practical to determine the key points of a construction and interdependent factors.
Źródło:
Archiwum Wiedzy Inżynierskiej; 2023, 8, 1; 6--8
2544-2449
Pojawia się w:
Archiwum Wiedzy Inżynierskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Typical Quality Defects of the „Alphin” Inserts in Engine Pistons
Autorzy:
Piątkowski, J.
Kamiński, P.
Powiązania:
https://bibliotekanauki.pl/articles/380070.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-Si cast alloy
alphin inserts
engine piston
5M why method
5 Why Method
quality defect
stop odlewniczy Al-Si
tłok silnikowy
metoda 5M why
metoda 5 why
wada jakości
Opis:
In the dissertation, the 5M Method, is being presented, of typical causes and consequences of quality defects of cast-iron inserts „alphin” embedded in aluminum cast. The diffusive connection of those rings, with pistons casts is being used, because of the extreme conditions in which they need to operate in, which are of high temperature and variable thermo-mechanical burden, which are in the working chamber of combustion engine.
Źródło:
Archives of Foundry Engineering; 2015, 15, 2 spec.; 65-68
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Skutki stosowania normy, 5 gFe/m3 w wodzie uzdatnionej na przykładzie wybranego wodociągu komunalnego
On the inadequacy of the iron concentration standard for potable water included in the ministry of health and social care directive
Autorzy:
Bonetyński, K.
Kowalski, D.
Stelmach, K.
Powiązania:
https://bibliotekanauki.pl/articles/236957.pdf
Data publikacji:
1999
Wydawca:
Polskie Zrzeszenie Inżynierów i Techników Sanitarnych
Tematy:
norma O,5 gFe/m3
woda uzdatniona
wodociągi
Opis:
In Poland, the quality parameters of potable and municipal water must comply with the Directive of May 4, 1990 issued by the Ministry of Health and Social Care. Although relevant regulations are met, analysis of tap water quality at draw-off points often reveals episodes of considerably exceeded admissible concentration values, especially those of iron compounds. This phenomenon should be attributed to the corrosive power of the material of which the pipes have been made, as well as to the high admissible concentration value for iron content in treated water. The objective of the study reported in this paper was to examine the contribution of fittings, pipes and pipelines to the recontamination of the tap water by iron compounds on the example of a municipal pipeline of choice. The authors estimated the quantity of iron compounds coming from the corrosion of fittings, pipes and water network, as well as analyzed the hydraulic loading of the housing-estate and transit pipelines. Consideration was also given to the problem of non-uniform distribution of iron compound concentrations at the chosen points of the water-pipe network under study. Determined were the factors contributing to the occurrence of exceeded iron compound concentrations at the draw-off points. The authors suggested a number of preventive measures.
Źródło:
Ochrona Środowiska; 1999, 4; 9-11
1230-6169
Pojawia się w:
Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction of scour depth around bridge piers in tandem arrangement using M5 and ANN regression models
Autorzy:
Rahul, M.
Baldev, S.
Powiązania:
https://bibliotekanauki.pl/articles/1818520.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
tandem arrangement
scour depth
sediment
pier
ANN
M5 model
układ tandemowy
głębokość wymycia
osad
pomost
model M5
Opis:
Purpose: Due to an increase in a number of bridges being constructed, scour depth around bridge piers is gradually being recognized as one of the possible reasons for bridge failure. According to [1] about 53% of bridge failures in the US were caused due to floods and corresponding scour in the rivers. Lots of work has been carried out around the single pier but in the case of group piers, the work is very less. Hence, it becomes necessary to calculate the actual scour depth around the bridge piers considering the close location of bridges as well. Design/methodology/approach: Recognizing the need for research in this direction, an experimental study was planned and conducted in the Hydraulics Laboratory of Civil Engineering Department of National Institute of Technology Kurukshetra, India. Experiments were conducted in a standard recirculating tilting bed water flume 15 m long, 0.4 m wide, and 0.60 m deep. The orientation of more than one pier, namely Tandem pattern was employed for the work. Two pier models, 62 mm and 42 mm diameter were used for the experimental study. The mobile bed used in the experiments had an average mean size, d50 = 0.23 mm, 0.30 mm and 0.50 mm. Findings: The outcomes of the ANN function and M5 model analysis have been used to compare with experimental results. From the earlier studies, it was concluded that, when the clear spacing between the pier models was greater than 0D the scour depth around the piers increase with a rapid rate. However, in the case of modelling techniques, M5 models show higher predictive accuracy than ANN models. Research limitations/implications: It is a significant area of research. However, the present study has been a time and facility- constrained study. Therefore, there is a large scope to conduct further studies on the subject, Different pattern i.e. Side by Side; Staggered and Group of piers can be adopted for further investigations. Originality/value: Sufficient work has been done by number of researchers around the single bridge pier. But due to rapid urbanization a number of bridges constructed in close proximity to each other which affects the scour depth of each other. Modelling techniques used in hydraulic engineering are not always effective in practice. The present study discusses the effect of spacing on scouring around piers in a tandem arrangement using experimental as well as modelling techniques. To predict the scour depth of the Tandem arrangement 89 laboratory data sets have been used.
Źródło:
Archives of Materials Science and Engineering; 2020, 102, 2; 49--58
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ZMIANY SZYBKOŚCI LOKOMOCYJNEJ 11-12 LETNICH CHŁOPCÓW TRENUJĄCYCH PIŁKĘ NOŻNĄ W KS SEMP URSYNÓW
Autorzy:
Tyc, Zbigniew
Śledziewski, Dariusz
Gryko, Karol
Powiązania:
https://bibliotekanauki.pl/articles/450672.pdf
Data publikacji:
2016
Wydawca:
Wyższa Szkoła Wychowania Fizycznego i Turystyki w Białymstoku
Tematy:
Piłka nożna
Chłopcy
Szybkość lokomocyjna
Dystans 5, 15 i 30 m
Football
Boys
Speed locomotion
Distance 5, 15 i 30 m
Opis:
Cel pracy. Celem badań była ocena zmian poziomu szybkości lokomocyjnej chłopców trenujących piłkę nożną w KS SEMP Ursynów w Warszawie. Diagnozowano statystyczną istotność wyników (wartości średnie) w trzech terminach badań, z uwzględnieniem cech budowy somatycznej badanych chłopców (wysokość i masa ciała). Materiał i metody. W badaniach brała udział grupa 28 zawodników z rocznika 2001 (n=12) oraz 2002 (n=16) trenujących w KS SEMP Ursynów w Warszawie. Przeprowadzono próby biegowe na dystansie 5, 15 oraz 30 m. Badania przeprowadzono trzykrotnie: w grudniu 2013, w czerwcu 2014 oraz w grudniu 2014. Rejestracji czasów dokonywano przy pomocy fotokomórek na boisku ze sztuczną nawierzchnią. Wyniki. Stwierdzono, że zmiany poziomu szybkości lokomocyjnej na wszystkich dystansach pomiędzy pierwszym a drugim i pierwszym a trzecim terminem badań były istotne statystycznie. Pomiędzy drugim a trzecim terminem badań istotny progres zanotowano jedynie dla próby biegu na odcinku 30 m. W wartościach względnych poprawa szybkości lokomocyjnej mieściła się w zakresie 4-6% w stosunku do poziomu wyjściowego. Wyniki na dystansach 5 i 15 m były skorelowane z warunkami somatycznymi badanych, przede wszystkim ich masą ciała. Wnioski. Uzyskane dane dowodzą, że trening szybkości lokomocyjnej piłkarzy w wieku przedpubertalnym daje znaczne efekty. Wraz z wydłużaniem się długości biegu zmniejsza się wpływ masy ciała badanych na wynik biegu, a wzrasta – jak się wydaje – rola techniki biegu oraz koordynacyjnych zdolności motorycznych (rytm, różnicowanie i dostosowanie napięć mięśniowych do potrzeb wysiłku szybkościowego).
Goal: The aim of the study was evaluation of changes in the level of the speed locomotion boys playing football in the FC SEMP Ursynów in Warsaw. Diagnosed statistical significance of the results (mean values) in three terms of research, taking into account the characteristics of the somatic build surveyed boys (body height and weight). Material and methods: The study involved group of 28 football players in 2001 (n=12) and 2002 (n=16) year of birth playing football in FC SEMP Ursynów in Warsaw. Tests were carried out on a speed distance of 5, 15 and 30 m. The study was conducted three times: in December 2013, in June 2014 and December 2014. Registration times were made using system of photocells on the football court with artificial turf. Results: There were observed statistical significant changes in the locomotion speed at all distances between the first and second and first and third term study. Between the second and the third term research significant progression was only recorded for the test run on the distance of 30 m. In relative speed improvement in the range of 4-6% compared to baseline. Results at distances of 5 and 15 m were correlated with somatic factors, especially with body weight. Conclusions: The data obtained show that the speed training football players in prepubertal aged gives significant results. The longer run distance reduces the effect of body weight in results of the race, and growing - as it seems - the role of run technic and coordination motor abilities (rhythm, differentiation and adaptation of muscle tension to the needs of a high-speed effort).
Źródło:
Roczniki Naukowe Wyższej Szkoły Wychowania Fizycznego i Turystyki w Białymstoku; 2016, 1(15); 57-67 s.
2081-1063
Pojawia się w:
Roczniki Naukowe Wyższej Szkoły Wychowania Fizycznego i Turystyki w Białymstoku
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Soft computing based prediction of friction angle of clay
Autorzy:
Dutta, R. K.
Gnananandarao, T.
Ladol, S.
Powiązania:
https://bibliotekanauki.pl/articles/1818506.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
artificial neural network
sensitivity analysis
M5P model tree
multiregression analysis
friction angle of clay
sztuczna sieć neuronowa
analiza wrażliwości
drzewo modelu M5P
analiza wielokrotnej regresji
Opis:
Purpose: This article uses soft computing-based techniques to elaborate a study on the prediction of the friction angle of clay. Design/methodology/approach: A total of 30 data points were collected from the literature to predict the friction angle of the clay. To achieve the friction angle, the independent parameters sand content, silt content, plastic limit and liquid limit were used in the soft computing techniques such as artificial neural networks, M5P model tree and multi regression analysis. Findings: The major findings from this study are that the artificial neural networks are predicting the friction angle of the clay accurately than the M5P model and multi regression analysis. The sensitivity analysis reveals that the clay content is the major influencing independent parameter to predict the friction angle of the clay followed by sand content, liquid limit and plastic limit. Research limitations/implications: The proposed expressions can used to predict the friction angle of the clay accurately but can be further improved using large data for a wider range of applications. Practical implications: The proposed equations can be used to calculate the friction angle of the clay based on sand content, silt content, plastic limit and liquid limit. Originality/value: There is no such expression available in the literature based on soft computing techniques to calculate the friction angle of the clay.
Źródło:
Archives of Materials Science and Engineering; 2020, 104, 2; 58--68
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nowe spojrzenie na tolerancje geometryczno-wymiarowe
New Approach to Dimensional and Geometrical Tolerancing
Autorzy:
Humienny, Z.
Powiązania:
https://bibliotekanauki.pl/articles/152999.pdf
Data publikacji:
2007
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
tolerowanie geometryczne
ISO 1110
ASME Y14.5M
GDT
tolerancje kształtu
tolerancje kierunku
tolerancje położenia i bicia
geometrical tolerancing
location and run-out
Opis:
Przedstawiono trzy główne normy dotyczące tolerancji geometrycznych stosowane w przemyśle w Polsce. Podkreślono, iż te same symbole graficzne mogą mieć różną interpretację w zależności od tego, jaką normę przywołuje konstruktor lub metrolog. Podano szereg przykładów tolerancji, które przy tej samej symbolice rysunkowej mają różną interpretację.
Three main standards dedicated to geometrical tolerancing used in industry in Poland are presented. It is pointed that exactly the same graphical symbols may have different definition and explanation depending on particular standard that is referred by designer or quality engineer. A few examples of specifications that with the same symbols have pretty different explanations are given.
Źródło:
Pomiary Automatyka Kontrola; 2007, R. 53, nr 1, 1; 27-30
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
How machine learning algorithms are used in meteorological data classification: a comparative approach between DT, LMT, M5-MT, gradient boosting and GWLM-NARX models
Autorzy:
Fayaz, Sheikh Amir
Zaman, Majid
Butt, Muheet Ahmed
Kaul, Sameer
Powiązania:
https://bibliotekanauki.pl/articles/38433812.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
meteorological data
M5 model tree
linear model functions
gradient boosting
logistic model tree
Opis:
Rainfall prediction is one of the most challenging task faced by researchers over the years. Many machine learning and AI based algorithms have been implemented on different datasets for better prediction purposes, but there is not a single solution which perfectly predicts the rainfall. Accurate prediction still remains a question to researchers. We offer a machine learning-based comparison evaluation of rainfall models for Kashmir province. Both local geographic features and the time horizon has influence on weather forecasting. Decision trees, Logistic Model Trees (LMT), and M5 model trees are examples of predictive models based on algorithms. GWLM-NARX, Gradient Boosting, and other techniques were investigated. Weather predictors measured from three major meteorological stations in the Kashmir area of the UT of J&K, India, were utilized in the models. We compared the proposed models based on their accuracy, kappa, interpretability, and other statistics, as well as the significance of the predictors utilized. On the original dataset, the DT model delivers an accuracy of 80.12 percent, followed by the LMT and Gradient boosting models, which produce accuracy of 87.23 percent and 87.51 percent, respectively. Furthermore, when continuous data was used in the M5-MT and GWLM-NARX models, the NARX model performed better, with mean squared error (MSE) and regression value (R) predictions of 3.12 percent and 0.9899 percent in training, 0.144 percent and 0.9936 percent in validation, and 0.311 percent and 0.9988 percent in testing.
Źródło:
Applied Computer Science; 2022, 18, 4; 16-27
1895-3735
2353-6977
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction of bearing capacity of H shaped skirted footings on sand using soft computing techniques
Autorzy:
Gnananandarao, -
Khatri, V. N.
Dutta, R. K.
Powiązania:
https://bibliotekanauki.pl/articles/1818514.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
bearing capacity ratio
sand
artificial neural networks
M5P model tree
regular plan shaped skirted footings
H plan shaped skirted footings
współczynnik nośności
piasek
sztuczne sieci neuronowe
drzewo modelu M5P
Opis:
Purpose: The present study aims to apply soft computing techniques, Artificial Neural Network (ANN) and M5P model tree, to predict the ultimate bearing capacity of the H plan shaped skirted footing on the sand Design/methodology/approach: A total of 162 laboratory test data for the regular plan shaped (square, circular, rectangular, and strip (up to L/B = 2.5) skirted footing were collected from the literature to develop the soft computing-based models. These models were later modified for the H Plan shaped skirted footing with the introduction of the multiplication factor. The input variables chosen for the regular plan shaped footings were skirt depth to width of the footing ratio (Ds/B), friction angle of the sand (o), the ratio of the interface friction angle-to-friction angle of sand (5/o), and length-to-width (L/B) ratio of the footing. The output is the bearing capacity ratio (BCR, a ratio of the bearing capacity of the skirted footing to the bearing capacity of un-skirted footing). Findings: Sensitivity analysis was carried out to see the impact of the individual variable on the BCR). The sensitivity results reveal that the skirt depth to width of the footing ratio is the primary variable affecting the BCR. Finally, the performance of the developed soft computing models was assessed using six statistical parameters. The results from the statistical parameters reveal that model developed using ANN was performing superior to the one prepared using M5P model tree technique for the prediction of the ultimate bearing capacity of H plan shaped skirted footing on sand. Research limitations/implications: The model equations are developed with experimental laboratory data. Hence, these equations need further improvement by using field data. However, until now there no field data have been available to include in the present data set. Practical implications: These proposed model equations can be used to predict the bearing capacity of the H-shaped footing with the help of Ds/B, o, S/o and L/B without performing the laboratory experiments. Originality/value: There is no such model equation that was developed so far for the H-shaped skirted footings. Hence, an attempt was made in this article to predict the bearing capacity of the H-shaped footing by using available experimental data with the help of soft computing techniques.
Źródło:
Archives of Materials Science and Engineering; 2020, 103, 2; 62--74
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Direct regeneration of Withania somnifera (L.) Dunal – A medicinal plant
Autorzy:
Kannan, T. M. Sathees
Anbazhakan, S.
Powiązania:
https://bibliotekanauki.pl/articles/1186751.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
M.S–B5 medium
ithania somnifera
medicinal plant
meristematic explants
Opis:
Plants have been an important source of medicine for thousands of years. Medicinal plants are the most important source of life saving drugs. Even today, the WHO estimates that up to 80 per cent of people still rely mainly on traditional remedies such as herbs for their medicines. Medicinal plants are resources of new drugs. Approximately one quarter of prescribed drugs contain plant extracts or active ingredients obtained from plant substances. Medicinal plants are the most important source of life saving drugs for the majority of the world’s population. The biotechnological tools are important to select, multiply and conserve the critical genotypes of medicinal plants. In-vitro regeneration holds tremendous potential for the production of high-quality plant-based medicine. An efficient protocol was developed for high frequency and rapid regeneration was achieved in Withania somnifera (L.) Dunal. Invitro cultures were initiated by meristematic explants on M.S–B5 medium with various growth hormones individually as well as combinations. Highest shoot multiplication rates were observed when explants grown in the medium supplemented with 2.0 mg/l of BAP. M.S–B5 medium fortified with 1.0 mg/l BAP was found suitable for optimum growth and elongation of shoots. The best rooting response were observed when the medium containing 1.0 mg/l of IBA. The rooted plantlets were successfully established in soil.
Źródło:
World Scientific News; 2016, 32; 60-70
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Underwater wet repair welding of API 5L X65M pipeline steel
Autorzy:
Rogalski, G.
Fydrych, D.
Łabanowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/258860.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
underwater welding
wet welding
underwater pipeline
API 5L X65M steel
Opis:
This paper presents results of the research of effect of polymer insulation of pipeline made of API 5L X65M steel as well as underwater wet welding parameters on properties of joints made by covered electrodes. Effect of heat input on structure and hardness of joints during repair of underwater pipeline was analyzed. Welding defects like microcracks, micro-lacks of fusion, slag inclusions, as well as HAZ hardness increase over an assumed acceptance criterion for welded joints in pipes without anticorrosion polymer insulation, were identified. A significant effect of polimer insulation on structure and properties of welded joints, was found.
Źródło:
Polish Maritime Research; 2017, S 1; Bibliogr. 27 poz., rys., tab.
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction of flexural strength of FRC pavements by soft computing techniques
Autorzy:
Kimteta, A.
Thakur, M.S.
Sihag, P.
Upadhya, A.
Sharma, N.
Powiązania:
https://bibliotekanauki.pl/articles/24200582.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
flexural strength
fibre reinforced concrete
artificial neural network
random forest
random tree
M5P based model
wytrzymałość na zginanie
beton zbrojony włóknami
sztuczna sieć neuronowa
las losowy
drzewo losowe
model oparty na M5P
Opis:
Purpose: The mechanical characteristics of concrete used in rigid pavements can be improved by using fibre-reinforced concrete. The purpose of the study was to predict the flexural strength of the fibre-reinforced concrete for ten input variables i.e., cement, fine aggregate, coarse aggregate, water, superplasticizer/high range water reducer, glass fibre, polypropylene fibre, steel fibres, length and diameter of fibre and further to perform the sensitivity analysis to determine the most sensitive input variable which affects the flexural strength of the said fibre-reinforced concrete. Design/methodology/approach: The data used in the study was acquired from the published literature to create the soft computing modes. Four soft computing techniques i.e., Artificial neural networks (ANN), Random forests (RF), Random trees RT), and M5P, were applied to predict the flexural strength of fibre-reinforced concrete for rigid pavement using ten significant input variables as stated in the ‘purpose’. The most performing algorithm was determined after evaluating the applied models on the threshold of five statistical indices, i.e., the coefficient of correlation, mean absolute error, root mean square error, relative absolute error, and root relative squared error. The sensitivity analysis for most sensitive input variable was performed with out-performing model, i.e., ANN. Findings: The testing stage findings show that the Artificial neural networks model outperformed other applicable models, having the highest coefficient of correlation (0.9408), the lowest mean absolute error (0.8292), and the lowest root mean squared error (1.1285). Furthermore, the sensitivity analysis was performed using the artificial neural networks model. The results demonstrate that polypropylene fibre-reinforced concrete significantly influences the prediction of the flexural strength of fibre-reinforced concrete. Research limitations/implications: Large datasets may enhance machine learning technique performance. Originality/value: The article's novelty is that the most suitable model amongst the four applied techniques has been identified, which gives far better accuracy in predicting flexural strength.
Źródło:
Archives of Materials Science and Engineering; 2022, 117, 1; 13--24
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative study for deriving stagedischarge – sediment concentration relationships using soft computing techniques
Autorzy:
Sihag, P.
Sadikhani, M. R.
Vambol, V.
Vambol, S.
Prabhakar, A. K.
Sharma, N.
Powiązania:
https://bibliotekanauki.pl/articles/1818806.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
sediment load concentration
Baitarani river
M5P
random forest
ładunek osadu
stężenie
rzeka Baitarani
las losowy
Opis:
Purpose: Knowledge of sediment load carried by any river is essential for designing and planning of hydro power and irrigation projects. So the aim of this study is to develop and evaluating the best soft-computing-based model with M5P and Random Forest regressionbased techniques for computation of sediment using datasets of daily discharge, daily gauge and sediment load at the Champua gauging site of the Upper Baitarani river basin of India. Design/methodology/approach: Last few decades, the soft computing techniques based models have been successfully used in water resources modelling and estimation. In this study, the potential of tree based models are examined by developing and comparing sediment load prediction models, based on M5P tree and Random forest regression (RF). Several M5P and RF based models have been applied to a gauging site of the Baitarani River at Odisha, India. To evaluate the performance of the selected M5P and RF-based models, three most popular statistical parameters are selected such as coefficient of correlation, root mean square error and mean absolute error. Findings: A comparison of the results suggested that RF-based model could be applied successfully for the prediction of sediment load concentration with a relatively higher magnitude of prediction accuracy. In RF-based models Qt, Q(t-1), Q(t-2), S(t-1), S(t-2), Ht and H(t-1) combination based M10 model work superior than other combination based models. Another major outcome of this investigation is Qt, Q(t-1) and S(t-1) based model M4 works better than other input combination based models using M5P technique. The optimum input combination is Qt, Q(t-1) and S(t-1) for the prediction of sediment load concentration of the Baitarani River at Odisha, India. Research limitations/implications: The developed models were tested for Baitarani River at Odisha, India.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2021, 104, 2; 57--76
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 23

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