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Tytuł:
Uncertainty analysis of operational conditions in selective artificial ground freezing applications
Autorzy:
Zueter, Ahmad
Akhtar, Saad
Sasmito, Agus
Powiązania:
https://bibliotekanauki.pl/articles/2201410.pdf
Data publikacji:
2022
Wydawca:
Główny Instytut Górnictwa
Tematy:
selective artificial ground freezing
Monte Carlo
pipes eccentricity
uncertainty analysis
reduced-order modelling
selektywne sztuczne zamarzanie gruntu
analiza niepewności
modelowanie zredukowanego rzędu
Opis:
Artificial ground freezing (AGF) systems are susceptible to uncertain parameters highly affecting their performance. Particularly, selective artificial ground freezing (S-AGF) systems involve several uncertain operational conditions. In this study, uncertainty analysis is conducted to investigate four operational parameters: 1) coolant inlet temperature, 2) coolant flow rate, 3) pipes emissivity, and 4) pipes eccentricity. A reduced-order model developed and validated in our previous work for field-scale applications is exploited to simulate a total of 5,000 cases. The uncertain operational parameters are set according to Monte Carlo analysis based on field observations of a field-scale freeze-pipe in the mining industry extending to 460 m below the ground surface. The results indicate that the freezing time can range between 270 and 350 days with an average of 310 days, whereas the cooling load per one freeze-pipe ranges from 90 to 160 MWh, with an average of 129 MWh. Furthermore, it is observed that the freezing time and energy consumed are mostly dominated by the coolant inlet temperature, while energy dissipated in the passive zone (where ground freezing is not needed) is mostly affected by pipes emissivity. Overall, the conclusions of this study provide useful estimations for engineers and practitioners in the AGF industry.
Źródło:
Journal of Sustainable Mining; 2022, 21, 3; 169--179
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wizje porządku społecznego i ich determinanty. Analiza opinii społeczności warszawskiej
THE VISIONS OF SOCIAL ORDER AND THEIR DETERMINANTS. THE ANALYSIS OF WARSAW COMMUNITYS OPINIONS
Autorzy:
Zaborowski, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/427857.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ATTITUDES
MULTIVARIATE ANALYSIS
POSITION IN SOCIAL STRUCTURE
SOCIAL ORDER
Opis:
The article presents the analysis of research on the visions of the existing social order that were forming among the citizens of Warsaw in the period preceding the outburst of open social conflict in the 1980s. The author distinguishes five types of these visions: 'optimistic', 'permissive', 'indifferent', 'reformist' and 'radical'. The differentiation of these visions depending on different position in social structure of the individuals who voice them (such as their professional occupation, level of education, place of work, economic standing, social background, belonging to social organizations, membership in political organizations and attitudes to religion) forms the central analytical problem of the article. The analysis aims at finding out, which features of social position favor particular types of visions of existing social order. The patterns of dependencies derived from multivariate analysis are far from being clear-cut, however, which leads the author to suggesting that position in social structure cannot be sole predictor of attitudes to existing social order and perhaps other factors (i.e. cultural ones) have to be included in the analysis.
Źródło:
Studia Socjologiczne; 2011, 1(200); 407-434
0039-3371
Pojawia się w:
Studia Socjologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vibration control and performance analysis of full car active suspension system using fractional order terminal sliding mode controller
Autorzy:
Yuvapriya, T.
Lakshami, P.
Rajendiran, S.
Powiązania:
https://bibliotekanauki.pl/articles/230099.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
active suspension system
fractional order terminal sliding mode controller
ISO8608
ISO2631
stability analysis
vibration dose value
Opis:
The main goal of introducing Active Suspension System in vehicles is to reduce the vehicle body motion under road obstacles which improves the ride comfort of the passenger. In this paper, the Full Car Model (FCM) with seven Degrees of Freedom is considered and simulated by MATLAB/Simulink. The Terminal Sliding Mode Controller (TSMC) and Fractional Order Terminal Sliding Mode Controller (FOTSMC) are designed to enhance the ride quality, stability and passenger comfort for FCM. The designed FOTSMC has the ability to provide higher control accuracy in a finite time. The performances of the designed controllers are evaluated by measuring the vehicle body vibration in both angular and vertical direction under bump input and ISO-8608 random input against passive suspension system. The Frequency Weighted Root Mean Square (FWRMS) and Vibration dose value of Body Acceleration as per ISO-2631 are evaluated for FOTSMC, TSMC and PSS. The stability of the FCM is proved by Lyapunouv theory. Further analysis with sprung mass and speed variation of FCM demonstrate the robustness of proposed controller. To investigate the performances of designed controllers, comparison is made with existing Sliding Mode Controller (SMC) which proves that the designed FOTSMC performs better than existing SMC.
Źródło:
Archives of Control Sciences; 2020, 30, 2; 295-324
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Case study about economic order quantities and comparison of results from conventional EOQ model and response surface-based approach
Autorzy:
Yıldız, R.
Yaman, R.
Powiązania:
https://bibliotekanauki.pl/articles/406756.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
economic order quantity
Pareto analysis
response surface
demand forecasting
Opis:
This study involves the implementation of an economic order quantity (EOQ) model which is an inventory control method in a ceramic factory. Two different methods were applied for the calculation of EOQs. The first method is to determine EOQ values using a response surface method-based approach (RSM). The second method uses conventional EOQ calculations. To produce a ceramic product, 281 different and additive materials may be used. First, Pareto (ABC) analysis was performed to determine which of the materials have higher priority. Because of this analysis, the value of 21 items among 281 different materials and additives were compared to the ratio of the total product. The ratio was found to be 70.4% so calculations were made for 21 items. Usage value for every single item for the years 2011, 2012, 2013 and 2014, respectively, were obtained from the company records. Eight different demand forecasting methods were applied to find the amount of the demand in EOQ. As a result of forecasting, the EOQ of the items were calculated by establishing a model. Also, EOQ and RSM calculations for the items were made and both calculation results were compared to each other. Considering the obtained results, it is understood that RSM can be used in EOQ calculations rather than the conventional EOQ model. Also, there are big differences between the EOQ values which were implemented by the company and the values calculated. Because of this work, the RSM-based EOQ approach can be used to decide on the EOQ calculations as a way of improving the system performance.
Źródło:
Management and Production Engineering Review; 2018, 9, 3; 23-32
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exploratory data analysis of environmental governance at local level in the south-west region of Poland
Autorzy:
Wiatkowska, Barbara
Powiązania:
https://bibliotekanauki.pl/articles/434785.pdf
Data publikacji:
2018
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
environmental order
sustainable development
exploratory data analysis
spatial analysis
GIS
Opis:
Conducting integrated measures within the framework of sustainable development requires an objective identification of the needs for their implementation based on the results of multifaceted analyses of many complex, interrelated factors reflecting the state of the natural environment and the economic and demographic situation. The increasing functionality of Geographic Information Systems (GIS), has made GIS databases a tool supporting the implementation of sustainable development activities. The aim of the study was to recognise the spatial variability of the level of environmental governance in the south-west region of Poland. Methods of research on multidimensional data mining techniques and geo-spatial analyses were applied, resulting in a theoretical model describing the regularities in the relationships between the analysed indicators of environmental governance. The level of environmental governance was most strongly determined by indicators concerning climate change and biodiversity.
Źródło:
Biblioteka Regionalisty; 2018, 18; 62-78
2081-4461
Pojawia się w:
Biblioteka Regionalisty
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
„Społeczeństwo Otwarte” – czasopismo wspierające nauczycieli w wychowaniu uczniów do demokracji i obywatelskości
Społeczeństwo Otwarte [The Open Society] – a magazine offering support for teachers in educating the students towards democracy and citizenship
Autorzy:
Wereszczyńska, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/428600.pdf
Data publikacji:
2019
Wydawca:
Wydawnictwo Naukowe Chrześcijańskiej Akademii Teologicznej w Warszawie
Tematy:
civic education
social studies
democracy
social order
self-governance
Społeczeństwo Otwarte [The Open Society] – the magazine analysis
edukacja obywatelska
wiedza o społeczeństwie
demokracja
ład społeczny
samorządność
„Społeczeństwo Otwarte” – analiza czasopisma
Opis:
The article outlines the activity of the publisher of Społeczeństwo Otwarte magazine which was issued from 1990 to 1998. At that time, it was the only national magazine which dealt with the range of meanings which in the Polish schools and education realized by teachers should have been combined with democracy, forming of the citizens as well as social science. On the basis of the conducted analysis of the aforementioned monthly, selected issues are presented devoted to the area of civic education, democracy, social order and self-governance published by its editors in order to support the teachers in their self-education and competence enhancement which is necessary in educating the students towards life in a democratic society.
W artykule przedstawiono zarys działalności redakcji czasopisma „Społeczeństwo Otwarte”, wydawanego w latach 1990-1998. Jedynego w owym czasie w kraju, starającego się zagospodarować ten obszar znaczeń, który w polskiej szkole i edukacji realizowanej przez nauczycieli należało łączyć z demokracją, formacją obywatela i nauką o społeczeństwie. Na podstawie przeprowadzonej analizy miesięcznika przybliżono wybrane treści wiążące się z problematyką wychowania obywatelskiego, demokracją, ładem społecznym i samorządnością. Były publikowane przez redakcję w celu wspierania nauczycieli w samokształceniu i uzupełnianiu kompetencji, koniecznych w edukacji uczniów do życia w społeczeństwie demokratycznym.
Źródło:
Studia z Teorii Wychowania; 2019, 4 (29); 107-133
2083-0998
2719-4078
Pojawia się w:
Studia z Teorii Wychowania
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza zapisów dotyczących kształtowania ładu przestrzennego w miejscowych planach zagospodarowania przestrzennego gminy Siechnice
Analysis of the Records of the Creation of Spatial Order in the Local Spatial Management Plans of Community Siechnice
Autorzy:
Warczewska, B.
Powiązania:
https://bibliotekanauki.pl/articles/1188464.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Przyrodniczy we Wrocławiu
Tematy:
analiza
kształtowanie
przestrzeń
miejscowy plan zagospodarowania przestrzennego
analysis
spatial order
local management plans
Opis:
The article brought closer to the concept of the spatial order, drew attention to the relationship between the space harmony and the ordering of relationships arising from the functional, socio-economic, environmental, cultural and compositional - aesthetic conditions and requirements. There were described the selected research and evaluation methods of the spatial order. The many-sidedness of the spatial order hinders its measurableness. The presented methods capture the issue in a fragmentary way. Tool for shaping of the spatial order at the local level is the local land management plan. The article presents an analysis of the records of the spatial order in the selected local land management plans of community Siechnice. In conclusions there was drew attention to the under-utilization of regulatory possibilities of the local plans. The used records enable flexibility in shaping of the building development, they do not include the landscape values and the need to protect them, the determinations contained therein are too vague and restrictive. With these records the creation of the spatial order seems to be impossible.
Źródło:
Architektura Krajobrazu; 2012, 4; 72-79
1641-5159
Pojawia się w:
Architektura Krajobrazu
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wielokryterialna ocena procesu kompletacji towarów w magazynie
Multi-Criteria Evaluation of the Order-Picking Process in the Warehouse
Autorzy:
Tarczyński, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/586698.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
Analiza wielokryterialna
Gospodarka magazynowa
Realizacja zamówień
Inventory management
Multicriteria analysis
Order processing
Opis:
This paper presents the order-picking problem as a multicriteria task. Using simulation tool 360 variants of solution were generated. The different combinations of the picking zone's shape, the number of forklift trucks and the picker-routing methods were considered. The variants were evaluated by seven criteria and the dominated solutions were removed. Then, using the Electre I method, the number of solutions was even more limited. The paper discusses and presents conclusions how to optimize the order-picking process.
Źródło:
Studia Ekonomiczne; 2013, 163; 221-238
2083-8611
Pojawia się w:
Studia Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An accuracy analysis of the cascaded lattice Boltzmann method for the 1D advection-diffusion equation
Autorzy:
Straka, Robert
Sharma, Keerti V.
Powiązania:
https://bibliotekanauki.pl/articles/29520238.pdf
Data publikacji:
2020
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
cascaded thermal lattice Boltzmann method
high order analysis
advection-diffusion equation
equivalent finite difference equation
Opis:
We analyze higher order error terms in a modified partial differential equation of a cascaded lattice Boltzmann method (CLBM) for one conservation law – the advection-diffusion equation. To inspect the behavior of the error terms we derived an equivalent finite difference equation (EFDE), this approach is different from other techniques like the Chapman-Engskog expansion, equivalent partial differential equations or the Maxwell iteration used in the literature. The resulting EFDE is obtained from the recurrence formulas of the lattice Boltzmann equations for the CLBM and is subsequently analyzed by standard analytical techniques. We have found relations of the LBM parameters which could cancel some of the higher order terms, making the method more accurate. The detailed derivation of the EFDE and higher order terms’ pre-factors is the main result of this paper. The resulting explicit form of the error terms are derived and presented.
Źródło:
Computer Methods in Materials Science; 2020, 20, 4; 173-184
2720-4081
2720-3948
Pojawia się w:
Computer Methods in Materials Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detectability of gear damage in combustion engines through a vibroacoustic method
Wykrywalność uszkodzeń przekładni zębatej silników spalinowych metodami wibroakustycznymi
Autorzy:
Stelmasiak, Z.
Rudnicki, M.
Powiązania:
https://bibliotekanauki.pl/articles/133712.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
vibroacoustics
cold test
gears
order analysis
wibroakustyka
test zimny
koła zębate
analiza rzędów
składowe harmoniczne
Opis:
The paper presents a new methodology in vibroacoustic diagnostics of internal combustion engines during a cold test on the production line. This method utilizes order analysis of harmonic components of vibroacoustic signals taken from a combustion engine driven with an electric motor to identify the source of noise and vibration amplitude. The presented analysis of the harmonic orders was used to diagnose the damage of the gear teeth.
W artykule przedstawiono nową metodykę wibroakustycznej diagnostyki silnika spalinowego podczas testu zimnego na linii produkcyjnej. Wykorzystuje ona analizę rzędową składowych harmonicznych sygnału wibroakustycznego silnika spalinowego napędzanego silnikiem elektrycznym do identyfikacji źródła hałasu i amplitudy drgań. Zaprezentowaną analizę rzędów harmonicznych stosowano do diagnostyki uszkodzeń zębów koła zębatego przekładni silnika spalinowego.
Źródło:
Combustion Engines; 2014, 53, 3; 12-22
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of external interferences on vibroacoustic signals coming from combustion engine during cold test
Wpływ zakłóceń zewnętrznych na sygnały wibroakustyczne silnika spalinowego podczas testu zimnego
Autorzy:
Stelmasiak, Z.
Rudnicki, M.
Powiązania:
https://bibliotekanauki.pl/articles/133499.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
vibroacoustics
cold test
order tracking analysis
wibroakustyka
test zimny
analiza rzędowa
Opis:
In the paper is presented impact of external interferences on vibroacoustic signals coming from a spark ignition engine’s vibrations in cold test performed on engine assembly line. As the basis to the analysis were used signals of piezoelectric sensor mounted on cylinder block of the engine driven by electric motor. In course of the testing it has been used the order tracking analysis of the vibrations during the cold test, while experimental results were used to statistic analysis of significance of influence with use of the MiniTab computer program. The main objective of the investigations was to verify actually obtained vibroacoustic signals and to minimize interferences coming from the measuring system. It should contribute to reduction of tolerance limits and improved detection of faulty engines with use of vibroacoustic methods. The investigations have shown significant impact of contact surface of the cylinder block with the sensor and impact of deformations of compression spring on results of recorded vibroacoustic signal. Such impact should be taken into considerations in numerical analysis of the signal. It has been proposed to perform activities to reduce influence of the interferences on recorded signals. Results of the investigations have been already utilized in production cold tests of spark ignition engines.
W artykule przedstawiono wpływ zakłóceń zewnętrznych na sygnały wibroakustyczne drgań silnika o zapłonie iskrowym podczas testu zimnego na linii produkcyjnej. Podstawą analiz były sygnały czujnika piezokwarcowego pochodzące z korpusu silnika spalinowego napędzanego silnikiem elektrycznym. W badaniach wykorzystano analizę rzędową drgań podczas testu zimnego, a wyniki doświadczalne poddano analizie statystycznej istotności oddziaływania z wykorzystaniem programu MiniTab. Podstawowym celem badań była weryfikacja aktualnie uzyskiwanych sygnałów wibroakustycznych i minimalizacja zakłóceń pochodzących od układu pomiarowego. Powinno to prowadzić do zmniejszenia limitów tolerancji i poprawy wykrywalności silników wadliwych metodami wibroakustycznymi. Badania wykazały istotny wpływ stanu powierzchni styku czujnika z kadłubem i odkształcenia sprężyny dociskowej na wyniki rejestrowanego sygnału wibroakustycznego. Wpływ ten należy uwzględniać w numerycznych analizach sygnału. Zaproponowano zabiegi zmniejszające oddziaływanie zakłóceń na rejestrowany sygnał. Wyniki badań mogą być już obecnie wykorzystane w produkcyjnych testach zimnych silników o zapłonie iskrowym.
Źródło:
Combustion Engines; 2015, 54, 1; 26-35
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrostatic microactuators for precise positioning and comparison of their parameters
Autorzy:
Štarman, V.
Kacerovský, J.
Jansa, J.
Karban, P.
Doležel, I.
Powiązania:
https://bibliotekanauki.pl/articles/97343.pdf
Data publikacji:
2013
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
electrostatic microactuators
force effects
fully adaptive higher-order finite element method
numerical analysis
efficiency
Opis:
Comparison of several types of electrostatic microactuators is carried out, particularly with respect to their resultant force effects. The continuous mathematical model of such actuators is mostly described by the Laplace equation. In this paper, its numerical solution is performed by a fully adaptive higher-order finite element method, using a code developed by the authors. The methodology is illustrated with typical examples whose results are discussed.
Źródło:
Computer Applications in Electrical Engineering; 2013, 11; 122-127
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some efficient seventh-order derivative-free families in root-finding
Autorzy:
Soleymani, F.
Powiązania:
https://bibliotekanauki.pl/articles/254710.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
numerical analysis
derivative-free families
order
iterative methods
Opis:
The interest in efficient root-finding iterations is nowadays growing and influenced by the widespread use of high-speed computers. On the other hand, the calculation of derivatives is often hard, when the problems are formulated in terms of nonlinear equations and as a result, the importance of derivative-free methods emerges. For these reasons, some efficient three-step families of iterations for solving nonlinear equations are suggested, where the analytical proofs show their seventh-order error equations consuming only four function evaluations per iteration. We employ hard numerical test problems to illustrate the accuracy of the new methods from the families.
Źródło:
Opuscula Mathematica; 2013, 33, 1; 163-173
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Funkcjonalna interpretacja tekstów historycznych. Dwa typy tekstów prolepsy w języku greckim na przykładzie Medei Eurypidesa (248-249) i Ewangelii wg św. Jana (12, 12-13)
Functional Interpretation of Ancient Texts. Two Types of Greek Prolepsis in Medea by Eurypides (248-249) and in the Gospel of St. John (12, 12-13)
Autorzy:
Sobotka, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/567884.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Mikołaja Kopernika w Toruniu. Wydawnictwo UMK
Tematy:
functional analysis
theme
rheme
word order
Greek
Latin
particle
conjunction
gár
dé
prolepsis
Medea
the Gospel of St. John
báion ‘palm branch’
foĩniks I ‘palm tree, palm branch’
foĩniks II ‘phoenix’
Opis:
The two parts of the article analyse the possibilities of a functional interpretation, in terms of the theme-rheme devision, of ancient texts. The author discusses examples from Classical Greek and Latin as well as New Testament Greek, especially their word order, grammatical and lexical features. On this basis he proposes an analytical approach to the description of the linguistic values connected on some degree with the communicative structure of these examples. The contextual procedures of indicating markers of thematic or rhematic elements of the sentences in question should be compared with conclusions drawing on the grammatical and semantic observations on the sentence constituents. The determination of theme and rheme exponents must be made - depending on the language - by verifying the means of coding information structure, relevant to the given language, text type, and time of its composition. A complete description of these means should be proceeded by detailed investigation of, for example, in the case of Ancient Greek: standard and contrastive word order, initial positions of utterances (including semantic descriptions of items involved in these positions), functions of the particles, conjunctions, articles, adverbs, personal pronouns, anaphors et al., syntactic and semantic roles of the constituents, etc. The second part of this article considers information status and value of Greek prolepsis. The author distinguishes morphological, syntactic and lexical prolepsis. The las two types are discussed using examples from Medea by Eurypides and the Gospel of St. John. The first example represents syntactic prolepsis, the second one - lexical. Neither the pronoun ἡμᾶς 'we' from Medea, nor the noun φοινίκων 'palm branches' from St. John's Gospel are thematic as claimed by some researches. Both syntactic and lexical prolepsis are components of a different level of utterances than the material one. The author postulates to consider them as rhematic rather than thematic. Prolepsis functions like quotation which comments on the whole utterance.
Źródło:
Linguistica Copernicana; 2012, 1(7); 53-85
2080-1068
2391-7768
Pojawia się w:
Linguistica Copernicana
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Order of Emergence of the Morphological Markers of Temporal Expression in the Croatian EFL Learners’ Longitudinal Speech Production Data
Autorzy:
Semren, Mirjana
Powiązania:
https://bibliotekanauki.pl/articles/555461.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Warszawski. Wydział Lingwistyki Stosowanej
Tematy:
morphological markers
order of emergence
grammatical morphemes
verb tenses
obligatory occasion analysis
Opis:
This study addresses the acquisition of the morphological markers of temporal expression in the interlanguage of Croatian primary school learners of English as a foreign language (EFL). The acquisition of morphological markers was documented regarding the order of emergence of nine grammatical morphemes. The emergence of these morphemes was examined following the obligatory occasion analysis (R. Brown 1973) which identified the obligatory contexts for each morpheme and the number of their correct suppliance. The order of emergence was obtained by the group score method (H.C. Dulay/ M.K. Burt 1974) according to which the morphemes were ranked in decreasing order of accuracy. Additionally, the study documented the order of emergence of four verb tenses. The data collection period comprised three generations of Grade 8 learners thus yielding a total of 56 transcribed recordings. The learners’ language samples were gathered via task-based activities. Although the findings displayed discrepancies in the ranking orders obtained for different generations of Grade 8 learners, the Spearman rank order correlations suggest that there seems to be a homogeneous order of emergence across three generations of the eighth graders. The results revealed not only that Present Continuous emerged after Simple Present but also showed that Present Perfect emerged after Simple Past.
Źródło:
Applied Linguistics Papers; 2018, 25/2; 89-106
2544-9354
Pojawia się w:
Applied Linguistics Papers
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 66

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