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Tytuł:
Evaluation of the Educational and Preventive Programme for Students of the Fourth Year of Primary School and Recommendations for Practice
Autorzy:
Kusztal, Justyna
Piasecka, Małgorzata
Szwejka, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/44454242.pdf
Data publikacji:
2024
Wydawca:
Akademia Ignatianum w Krakowie
Tematy:
process enaluation
outcome evaluation
primary school
preventive programms
students
Opis:
Research objectives (aims) and problem(s): The aim of the article is to present the results of an evaluation study of an educational and preventive programme implemented in eight year 4 groups in six Krakow primary schools. The programme, entitled KOTWICA, ran from December 2021 to June 2022. The evaluation was external and comprehensive. During the programme, the evaluation of the process and of the outcome were carried out in the pre-test–post-test format. The research question is “what are the results of the evaluation of the KOTWICA educational and preventive programme for students of the fourth year of primary school?” Research methods: Eight proprietary tools were used to evaluate the process, and two standardised tools were used to evaluate the result. The collected material was subjected to statistical processing, whilst the qualitative data was encoded, categorised and analysed using tools for qualitative data analysis. Structure of the article: At the beginning, the authors justify the undertaking of the research and introduce the subject of the study on the basis of theoretical findings and the state of research in the field of school prevention. Then the research objectives are described and the research problem is defined. In turn, the research method, the selection criteria for the study group and the principles of data collection and processing are described. The results of the research and the limitations of the research process were also described. Finally, the conclusions of the research and recommendations for the theory and policy of school prevention are described. Research findings and their impact on the development of educational sciences: The results of the evaluation allow us to conclude that the objective of the educational and preventive programme conducted in year 4 was achieved and that it met the needs of the participants. However, they do not allow us to draw clear conclusions as to the effectiveness of the educational activities, due to the limitations of the collected research material. Conclusions and/or recommendations: In the light of the results, the authors drew conclusions regarding the methodology of evaluation studies and recommendations for preventive and educational practice.
Źródło:
Multidisciplinary Journal of School Education; 2024, 13, 1 (25); 191-211
2543-7585
Pojawia się w:
Multidisciplinary Journal of School Education
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of the Applicability of Aluminum Alloy Welding Processes during the Prefabrication of Ship Structures Based on the Multi-Index Method
Autorzy:
Urbański, Tomasz
Taczała, Maciej
Wąs, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/2201867.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
ship structures
prefabrication process
aluminum alloys welding
welding processes
evaluation criteria
multi-index evaluation
Opis:
The purpose of the paper is to evaluate the processes of welding aluminum alloys in terms of their applicability to the process of prefabrication of ship structures. The prefabrication process requires solving a number of problems related to the welding processes used (e.g. the problem of welding incompatibilities, deformations). Therefore, the key issue is to choose the right welding process, which is complex and difficult. It requires analysis of the process considering many points of view (e.g. technological, economic, security) in order to maximize the objectivity of the choice. Therefore, an attempt at a comprehensive view requires the formulation of a set of accurate evaluation criteria. The multi-indicator expert assessment presented in the article makes it possible to make such a choice. Currently used methods of welding aluminum alloys, both those from the group of conventional and innovative methods, were assessed. As a result of the analysis, the so-called technological hierarchy that allows to rank the assessed processes in terms of their suitability in the process of prefabrication of ship structures.
Źródło:
Advances in Science and Technology. Research Journal; 2023, 17, 1; 133--139
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of the modernized production system through selected TPM method indicators
Autorzy:
Michlowicz, Edward
Powiązania:
https://bibliotekanauki.pl/articles/2200930.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
continuous production system
system modernization
post-modernization evaluation
evaluation indices
OEE
MTTR
MTBF
process monitoring
Opis:
The subject of the studies is the evaluation of the operation of a production system after modernization. The analysed case concerns the modernization forced by the end of the product lifetime. The proposed methodology is that of a multicriterial evaluation of the system operation after modernization. The evaluation criteria are selected TPM indices: availability of machinery and equipment, production process capacity, product quality and overall equipment effectiveness (OEE). The additional criteria are reliability indices MTBF and MTTR of studied production lines and the MTTR of the most unreliable equipment in each analysed line. A yearly monitoring of production process was proposed for obtaining the statistical credibility of the evaluation results. Additionally, a fuzzy indicator of acceptability of the modernization assessment was proposed. The paper presents the results of studies of the system for production of zinc concentrate from post-production waste. The obtained values of OEE, MTBF and MTTR indicators for the three tested lines make it possible to state that the modernization carried out is acceptable.
Źródło:
Eksploatacja i Niezawodność; 2022, 24, 4; 677--686
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Concept of Calculating the Water Distribution System as a Repeatable Process with Elements of Diagnostics Using Neural Modeling
Autorzy:
Dawidowicz, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/2174897.pdf
Data publikacji:
2022
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
water distribution system
hydraulic calculation
process diagnostics
evaluation of calculation results
artificial neural network
Opis:
Calculations of water distribution systems are most often performed many times because the correct solution from a technical point of view is rarely obtained after the first calculation run; hence, we can talk about a multistage calculation process. In connection with this, the calculation process of computer water distribution systems can be additionally supplemented with elements of process diagnostics. Diagnostic activities should be carried out using numerical algorithms, which can be a complement to classical hydraulic calculations of water distribution systems. The condition for reliable functioning of the diagnostic system formulated in this way is the efficient detection of computational irregularities. For this purpose, diagnostic problems were defined for the water pipes and the connection nodes in the water distribution system. The proposed diagnostic tests analyze the calculation results and indicate whether the solution is correct or, if irregularities are detected, suggest a way to solve the problem. Diagnostic tests are carried out using artificial neural networks.
Źródło:
Rocznik Ochrona Środowiska; 2022, 24; 493--504
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method for evaluating and upgrading systems with parallel structures with forced redundancy
Autorzy:
Michlowicz, Edward
Wojciechowski, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/2038110.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
evaluation and retrofit method
parallel structure
redundancy
safety
process energy consumption
Opis:
The objects of the study are parallel-structure machine systems with redundancy associated with safety assurance of continuous material flow. The problem concerns systems in which the supply of materials takes place continuously (24 hours a day), and the system of operated machines must ensure the receipt and movement of the material at a strictly defined time and in the desired quantity. It is a system where the presence of a failure poses a threat to human life and environmental degradation. This paper presents a method for system condition assessment and upgrading for maintaining proper operation under conditions of continuous operation. A database of information about the current parameters of the system components (measurements, monitoring) is necessary for condition assessment. The method also uses lean techniques (including TPM). System evaluation and selection criteria for a suitable structure in terms of further operation were proposed. Exemplification was performed for an underground mine drainage system. As a part of the identification, selected parameters of the system components were measured, and their characteristics (motors, pumps, pipelines) were developed. The results of the analysis and the values of the adopted criteria were compared to the indicators for new pump sets. A two-option system upgrade was proposed, in addition to machine operating schedules, maintenance periods, and overhaul cycles.
Źródło:
Eksploatacja i Niezawodność; 2021, 23, 4; 770-776
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development and Performance Evaluation of a Pulverizer for Plantain Flour Process Plant
Autorzy:
Olutomilola, Emmanuel Olatunji
Ayodeji, Sesan Peter
Adeyeri, Michael Kanisuru
Fagbemi, Tayo Nathaniel
Powiązania:
https://bibliotekanauki.pl/articles/23965544.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
cukrzyca COVID 19
rozwój pulweryzatora
ocena wydajności
zakład przetwarzania mąki
diabetes COVID-19
pulverizer development
performance evaluation
plantain
flour process plant
Opis:
Diabetes, adjudged a risk factor for coronavirus infectious disease 2019 (COVID-19), can be managed through consumption of plantain and its associated products. Plantain is usually processed into flour and other storable/value-added products due to its very short shelf-life. To process unripe plantain pulps into flour, there is a need for size reduction after drying. This paper presents the development and performance evaluation of a size reduction unit for pulverizing, sieving and conveying material to the next processing stage in a plantain flour process plant. Its model was developed using solidworks application software. After design analysis, the model was simulated to establish its suitability/adequacy for fabrication. The pulverizer was fabricated using locally available materials. Its performance evaluation gave 400kg/h throughput, 96% crushing efficiency and 96% efficiency based on the required particle size. The average particle size of flour obtained was 236μm using 500μm screen. Effect of cyclone control-valve on the pulverizer’s overall efficiency was also investigated by allowing it to operate when the valve was completely closed, partially closed and fully opened. It was observed that the control-valve’s positions significantly influenced the machine’s performance/efficiency. It can thus be inferred that the position of cyclone control-valve has significant effect on a pulverizer’s efficiency/performance. Hence, leaving control-valve fully opened during operation would help a pulverizer perform with optimum efficiency, as the pulverizer was able to convey material, efficiently in that position, to the next processing stage during performance evaluation.
Źródło:
Production Engineering Archives; 2021, 27, 3; 223--231
2353-5156
2353-7779
Pojawia się w:
Production Engineering Archives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vehicle relocation efficiency - a case study of the parking company in the City of Zagreb
Autorzy:
Šimunović, Ljupko
Protega, Veselko
Ćosić, Mario
Bandov, Davor
Powiązania:
https://bibliotekanauki.pl/articles/2098120.pdf
Data publikacji:
2021
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
transport process efficiency
indicators of transport vehicle utilisation
systematic and integrated evaluation of the productivity
wydajność procesu transportowego
wskaźniki wykorzystania środków transportu
systematyczna ocena produktywności
zintegrowana ocena produktywności
Opis:
There is a need for vehicle relocation, whether for delivering new vehicles to their selling destinations, pulling inoperative or damaged vehicles out of traffiic, or removing illegally parked vehicles from the street. The relocation of illegally parked vehicles in the City of Zagreb is done by constantly monitoring parked vehicles or through citizen telephone alerts. The paper analyses the vehicle relocation service of the Zagrebparking company, which, in addition to overseeing car park management in public car parks and garages, is in charge of removing illegally parked vehicles. Due to the cyclic nature of its operations, a high share of empty rides, high vehicle investment costs, small quantities of cargo transported, high fuel prices, and high fuel consumption in the urban environment, Zagrebparking’s Vehicle Relocation Department operates with unnecessarily high costs. In this paper, vehicle relocation efficiency is analysed by presenting indicators of vehicle utilisation as part of a systematic evaluation of the company. Improvements to the current service are also provided.
Źródło:
Transport Problems; 2021, 16, 1; 39--50
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wykorzystanie oprogramowania wspomagającego analizę sieciową metodą PERT na przykładzie procesu celnego
Using PERT network analysis software on the example of the customs process
Autorzy:
Jasiukiewicz, Julia
Gikiewicz, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/1838254.pdf
Data publikacji:
2021
Wydawca:
Szkoła Główna Służby Pożarniczej
Tematy:
customs process
commodity
security
Program Evaluation and Review Technique
support software
proces celny
towar
bezpieczeństwo
metoda planowania i kontroli
oprogramowanie wspomagające
Opis:
Przepływ towarów jest istotnym elementem funkcjonowania ówczesnego społeczeństwa. W celu zapewnienia bezpieczeństwa tego procesu został on uregulowany prawnie oraz nałożono na towary cła, które pobierane są przez państwa od wywozu i przywozu towarów. Sprawny i bezpieczny przepływ towarów opiera się na odpowiednim procesie celnym. W celu zbadania i ulepszenia tego procesu zastosowano metodę analizy sieciowej. W artykule wykorzystano oprogramowanie wspomagające analizę sieciową metodą PERT, używając dodatkowego pakietu WinQSB 2.0 i określono korzyści oraz wady jego zastosowania. W opracowaniu omówiono pojęcia cło i towar. Opisano podstawy prawa celnego, procedury celne, bezpieczeństwo przepływu towarów, optymalizację decyzji w zagadnieniach bezpieczeństwa oraz metodę programowania sieciowego – PERT. Zapoznano z planem procesu celnego importu między krajem trzecim a krajem znajdującym się w UE, który następnie zbadano metodą PERT i opracowano w module PERT_CPM wspomagającym analizę sieciową. Celem artykułu jest określenie wykorzystania oprogramowania wspomagającego analizę sieciową metodą PERT w przedsięwzięciu dotyczącym bezpieczeństwa. słowa kluczowe proces celny, towar, bezpieczeństwo, metoda planowania i kontroli, oprogramowanie wspomagające
The movement of goods is an essential part of the functioning of a modern society. In order to ensure the safety of this process, it has been regulated by law and customs duties on the export and import of goods have been imposed on goods, which are levied by particular countries. Efficient and safe movement of goods is based on an appropriate customs process. In order to investigate and improve this process, a network analysis method has been used. The paper explores the use of the software supporting network analysis by the PERT method, with the help of the WinQSB 2.0 add-on package, and identifies the advantages and disadvantages of its use. It presents definitions of customs and commodity. The basics of customs law, customs procedures, security of goods movement, decision optimization in issues of the safety and the method of network programming – PERT were described. The customs import process plan between a third country and an EU Member State was examined using the PERT method and then developed in the PERT_CPM module that supports the network analysis. The objective of this paper is to determine the use of software supporting network analysis using the PERT method in a security-related undertaking.
Źródło:
Zeszyty Naukowe SGSP / Szkoła Główna Służby Pożarniczej; 2021, 2, 78; 51-81
0239-5223
Pojawia się w:
Zeszyty Naukowe SGSP / Szkoła Główna Służby Pożarniczej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of titanium alloy thread quality during cutting
Autorzy:
Zawada-Tomkiewicz, Anna
Żurawski, Łukasz
Tomkiewicz, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/1849148.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
process evaluation
thread measurement
titanium and its alloys
liquid nitrogen
Opis:
This article concerns a new method of assessing the thread cutting process and the quality of the formed thread using the method of optical observation of the workpiece during machining. A series of digital images of the thread profile was taken in transmitted light for each tool infeed. Such images, obtained with high resolution for three angular positions, were binarized, with the space between ridges taken in successive infeeds identified as “void”, and its projection was then parameterized. Two of these parameters, area of void and aspect ratio, were used as indicators of the technological quality of the thread. The suitability of the selected parameters for technological description of the thread was verified using the example of titanium alloy thread turning under ambient and cryogenic conditions.
Źródło:
Metrology and Measurement Systems; 2020, 27, 4; 563-574
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phenomenological technique for prediction of cavitation erosion performance
Autorzy:
Gireń, B. G.
Welzant, A.
Baran, P.
Powiązania:
https://bibliotekanauki.pl/articles/1818504.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
cavitation erosion
material performance
performance evaluation
wear
erosion process modelling
International Cavitation Erosion Test
erozja kawitacyjna
wydajność materiału
ocena wydajności
zużycie
modelowanie procesów erozji
Międzynarodowy Kawitacyjny Test Erozyjny
Opis:
Purpose: Major aim of the work was to formulate 2-parameters models of the cavitation erosion process and to bring about the particular methods for prediction of its performance with due calculation formulas. Design/methodology/approach: Phenomenological model of the erosion supplemented with functional relationships between calculation parameters and the strength parameters stand for the foundations of the method. Having assumed the probabilistic nature of the process and fatigue regime of the material destruction, the volume loss in time has been determined as proportional to the integral of the appropriate probability function. Correlations between parameters have been derived by adjusting the computed erosion curves to the experimental ones for the vast diversity of the cases. Findings: Two different formulas for the volume loss of the material in time under cavitation loading have been derived. Research limitations/implications: Results obtained from both the International Cavitation Erosion Test program as well as the own experiments carried out at the rotating disk set-up supplied necessary experimental data. Preliminary verification of the method soundness was completed. Assumption on the independence of the calculation parameters on the loading conditions have been taken. The approach is valid provided the defined relationships are also independent on the type and amplitude of the loading. Practical implications: Achieving the objectives is expected to result in developing a technique for assessment of the material damage under cavitation loadings. Numerical implementation of the model completed with the derived functional relationships stand for a tool, enabling a prospective user to predict the material performance under defined cavitation loading. Originality/value: New formulas for calculating the efficiency of cavitation erosion, inferred from the models of high physical clarity are the original contribution to the methodology and techniques concerned.
Źródło:
Archives of Materials Science and Engineering; 2020, 104, 2; 69--85
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Accelerated degradation analysis based on a random-effect Wiener process with one-order autoregressive errors
Przyspieszona analiza degradacji w oparciu o proces Wienera z efektem losowym z błędami autoregresyjnymi pierwszego rzędu
Autorzy:
Li, Junxing
Wang, Zhihua
Liu, Chengrui
Qiu, Ming
Powiązania:
https://bibliotekanauki.pl/articles/301246.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
reliability evaluation
accelerated degradation modeling
Wiener process
unit-to-unit variability
measurement errors
ocena niezawodności
przyspieszone modelowanie degradacji
proces Wienera
zmienność między jednostkami
błędy pomiaru
Opis:
For highly reliable and long-life products, accelerated degradation test (ADT) is often an effective and attractive way to assess the reliability. To analyze the accelerated degradation data, it has been well recognized that it is necessary to incorporate three sources of variability including the temporal variability, the unit-to-unit variability and measurement errors into the ADT model. The temporal variability can be properly described by the Wiener process. However, the randomness of the initial degradation level, which is an important part of the unit-to-unit variability, has been often neglected. In addition, regarding the measurement errors, current ADT models often assumed them to follow a mutually independent normal distribution and ignored the autocorrelation that may probably exist in them. These problems lead to a poor accuracy for reliability evaluation in some situation. Thus, a random-effect Wiener process-based ADT model considering one-order autoregressive (AR(1)) errors is proposed. Then closed-form expressions for the failure time distribution (FTD) is derived based on the concept of first hitting time (FHT). A statistical inference method is adopted to estimate unknown parameters. Finally, a comprehensive simulation study and a practical application are given to demonstrate the rationality and effectiveness of the proposed model.
W przypadku wysoce niezawodnych produktów o długim cyklu życia, przyspieszone badanie degradacji (ADT) często stanowi skuteczny i atrakcyjny sposób oceny niezawodności. Jak wiadomo, analiza danych z przyspieszonej degradacji wymaga włączenia do modelu ADT trzech źródeł zmienności, w tym zmienności czasowej, zmienności między jednostkami i błędów pomiarowych. Zmienność czasową można odpowiednio opisać za pomocą procesu Wienera. Jednak losowość początkowego poziomu degradacji, który stanowi ważną część zmienności między jednostkami, jest często w badaniach pomijana. Ponadto, w odniesieniu do błędów pomiaru, obecne modele ADT często zakładają, że mają one wzajemnie niezależne rozkłady normalne, ignorując możliwą autokorelację. Problemy te prowadzą w niektórych sytuacjach do niskiej trafności oceny niezawodności. W związku z powyższym, zaproponowano model ADT oparty na procesie Wienera z efektem losowym, w którym uwzględniono błędy autoregresyjne pierwszego rzędu (AR (1)). Następnie, w oparciu o pojęcie pierwszego czasu przejścia, wyprowadzono wyrażenia w postaci zamkniętej dla rozkładu czasu uszkodzenia (FTD). Do oszacowania nieznanych parametrów przyjęto metodę wnioskowania statystycznego. Na koniec przedstawiono kompleksowe studium symulacyjne i wskazano praktyczne zastosowanie modelu w celu wykazania jego racjonalności i skuteczności.
Źródło:
Eksploatacja i Niezawodność; 2019, 21, 2; 246-255
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Challenges of science from the point of view of the National Science Center
Autorzy:
Kossowka, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/703506.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
challenges of science
improvement of the evaluation process
open science
and open access
integrity and ethics in science
Opis:
Scientists around the world agree that nowadays, science is facing severe challenges like poor peer-review system, replicability crisis, or locked science behind paywalls. The National Science Center addresses at least some of them by introducing procedures that promote integrity, ethics, social responsibility, transparency, and openness in science.
Źródło:
Nauka; 2019, 3
1231-8515
Pojawia się w:
Nauka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Operating evaluation of a cooler and a freezer used for freezing of small wheat bakery products
Ocena eksploatacyjna chłodziarki i zamrażarki wykorzystanych do mrożenia drobnego pieczywa pszennego
Autorzy:
Mach, P.
Pałacha, Z.
Powiązania:
https://bibliotekanauki.pl/articles/13925560.pdf
Data publikacji:
2019
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
bakery
wheat bakery product
cooling
freezing process
operating evaluation
Źródło:
Zeszyty Problemowe Postępów Nauk Rolniczych; 2019, 599; 37-52
0084-5477
Pojawia się w:
Zeszyty Problemowe Postępów Nauk Rolniczych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Process Maturity Models – Applicability and Usability Review
Autorzy:
Fryt, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/1075488.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
BPM
Business Process Management
Maturity Assessment
Maturity Model
evaluation of process maturity
Opis:
Maturity models are tools enabling application of structured approach for process improvement and assessment of business process management capabilities (BPM) of the organizations. In fact, the number of maturity models is so large that it is difficult or even impossible to identify leading standard. The aim of this paper is therefore to provide a review of BPM maturity models. Design/methodology/ approach - the article follows research process of literature review. This work focuses in particular on the applicability and usability of process maturity models that were reviewed according to general design principles. Research Limitations/implications - The author is convinced that this review covers the main publicly available BPM maturity models. As the number of models is constantly increasing, paper is not claiming completeness.
Źródło:
World Scientific News; 2019, 129; 51-71
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new approach in separation process evaluation. Efficiency ratio and upgrading curves
Autorzy:
Irannajad, M.
Nuri, O. S.
Allahkarami, E.
Powiązania:
https://bibliotekanauki.pl/articles/110189.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
separation efficiency
mineral processing
selectivity index
process evaluation
efficiency ratio
operation efficiency
Separation Process
Opis:
In mineral processing separation efficiency (SE), operation efficiency (OE), selectivity index (SI) and other indices have been used to evaluate the separation process. Up to now, no study has been conducted on the relationship between the SE, OE and SI indices. In this research, two upgrading curves are proposed based on the above indices for process and selectivity evaluation. The first upgrading curve is based on recovery R, SE, and OE as a function of concentrate grade. This curve has three background lines, including no upgrading line, ideal upgrading line and the ideal mixing line. The proposed upgrading curve is applicable not only for process evaluation by specification of OE and SE, but also for selectivity evaluation with the lowest difference between SE and OE. The curve showed that the recovery value is always greater than the SE and OE values. The parameters of OE, SE and R were used for plotting the upgrading curve as a function of concentrate grade taking into consideration all of them at a time. A new selectivity indicator, namely Efficiency Ratio (ER) as the selectivity parameter, is proposed as the ratio of OE to SE. The ER values fluctuate between 1 and . It can be presented as a function of concentrate and tailing grades (ER = [c(1-t)]/[1(c-t)]). The results showed that ER is insensitive to the feed grade and has the inverse relationship with SI. To measure the separation selectivity, another upgrading curve is proposed based on ER and SI parameters. This curve is divided into seven separation classes for evaluation the class of a separation process from ideal class to no separation one. The results of this research can be useful for separation process evaluation.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 3; 847-857
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
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