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Tytuł:
An assembly line balancing problem automotive cables
Autorzy:
Triki, H.
Hachicha, W.
Mellouli, A.
Masmoudi, F.
Powiązania:
https://bibliotekanauki.pl/articles/407258.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
assembly line balancing problem
genetic algorithm
cycle time
precedence constrains
zoning constrains
Opis:
In this paper, an Assembly Line Balancing Problem (ALBP) is presented in a real-world automotive cables manufacturer company. This company found it necessary to balance its line, since it needs to increase the production rate. In this ALBP, the number of stations is known and the objective is to minimize cycle time where both precedence and zoning constrains must be satisfied. This problem is formulated as a binary linear program (BLP). Since this problem is NP-hard, an innovative Genetic Algorithm (GA) is implemented. The full factorial design is used to obtain the better combination GA parameters and a simple convergence experimental study is performed on the stopping criteria to reduce computational time. Comparison of the proposed GA results with CPLEX software shows that, in a reasonable time, the GA generates consistent solutions that are very close to their optimal ones. Therefore, the proposed GA approach is very effective and competitive.
Źródło:
Management and Production Engineering Review; 2015, 6, 1; 59-66
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An optimization study on an eco-friendly engine cycle named as Dual-Miller cycle (DMC) for marine vehicles
Autorzy:
Gonca, G.
Powiązania:
https://bibliotekanauki.pl/articles/259357.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
Dual-Miller cycle engine
engine performance
power density
finite-time thermodynamics
Opis:
The diesel engine is an indispensable part of technology and it is commonly used in land and marine vehicles. However, diesel engines release NOx emissions due to high combustion temperatures. They have harmful effects on the environment such as sources of photo-chemical fog and climate changes. Therefore, they must be reduced and limited. The Miller cycle application is a NOx control method and it is popular in the recent years to abate NOx produced from the internal combustion engines (ICEs). A performance investigation of a Dual-Miller cycle (DMC) engine in terms of power (PO), power density (PD) and effective efficiency (EE) has been performed using a new finite-time thermodynamics modeling (FTTM) in this study. The effects of engine design and operating parameters on the engine performance (EPER) have been examined. Additionally, the energy losses have been determined resulting from incomplete combustion (IC), friction (FR), heat transfer (HT) and exhaust output (EO). The results presented could be an essential tool for DMC marine engine designers.
Źródło:
Polish Maritime Research; 2017, 3; 86-98
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bayesian Inference for a Deterministic Cycle with Time-Varying Amplitude: The Case of the Growth Cycle in European Countries
Autorzy:
Lenart, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/2076240.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
deterministic cycle with time-varying amplitude
Bayesian inference
almost periodic function
growth cycle
industrial production
Opis:
The main goal of this paper is to propose the probabilistic description of cyclical (business) fluctuations. We generalize a fixed deterministic cycle model by incorporating the time-varying amplitude. More specifically, we assume that the mean function of cyclical fluctuations depends on unknown frequencies (related to the lengths of the cyclical fluctuations) in a similar way to the almost periodic mean function in a fixed deterministic cycle, while the assumption concerning constant amplitude is relaxed. We assume that the amplitude associated with a given frequency is time-varying and is a spline function. Finally, using a Bayesian approach and under standard prior assumptions, we obtain the explicit marginal posterior distribution for the vector of frequency parameters. In our empirical analysis, we consider the monthly industrial production in most European countries. Based on the highest marginal data density value, we choose the best model to describe the considered growth cycle. In most cases, data support the model with a time-varying amplitude. In addition, the expectation of the posterior distribution of the deterministic cycle for the considered growth cycles has similar dynamics to cycles extracted by standard bandpass filtration methods.
Źródło:
Central European Journal of Economic Modelling and Econometrics; 2018, 3; 233-262
2080-0886
2080-119X
Pojawia się w:
Central European Journal of Economic Modelling and Econometrics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charakterystyka gęstości czasowej jako podstawowy cykl obciążeń w badaniach ciągników rolniczych
Time density characteristic as a simple load cycle for research agricultural tractors
Autorzy:
Koniuszy, A.
Powiązania:
https://bibliotekanauki.pl/articles/290268.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
ciągnik rolniczy
silnik spalinowy
gęstość czasowa
uproszczony cykl obciążeń
tractor
tractor engine
time density
simple load cycle
Opis:
W artykule opisano metodę tworzenia charakterystyki gęstości czasowej pracy silnika, m.in. dla potrzeb oceny emisji spalin z ciągników rolniczych. Opracowano i przedstawiono wyniki badań ciągnika U 912 zebrane i uśrednione w dwumiesięcznym okresie eksploatacji, w jednym z gospodarstw Pomorza Zachodniego. Przedstawiono zakresy najczęściej występujących obciążeń badanego silnika ciągnikowego wykazując, że nie był on optymalnie eksploatowany. Stwierdzono, że na podstawie charakterystyki gęstości czasowej można tworzyć uproszczone cykle obciążeń do oceny właściwości użytkowych badanej grupy pojazdów.
The article describes a method of creating time density characteristic of an engine for example of evaluation of average emission of exhausts from agricultural tractors. The data being the effect of two month exploitation research of agricultural tractor U 912 on an agricultural farm in Pomorze Zachodnie, were collected, handled, averaged and presented. Range of the most frequent loads occurring in the agricultural tractor's engine under research shows, that it was not optimally exploited. It was ascertained that on the grounds of time density characteristics simplified cycles of loads can be made for the purpose of evaluation of exploitation properties of the group of vehicles under research.
Źródło:
Inżynieria Rolnicza; 2008, R. 12, nr 1(99), 1(99); 181-188
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Czasoprzestrzenny wymiar logistyki miasta
Space-time dimension of city logistics
Autorzy:
Gulczyński, W.
Powiązania:
https://bibliotekanauki.pl/articles/1383661.pdf
Data publikacji:
2018
Wydawca:
Polskie Wydawnictwo Ekonomiczne
Tematy:
logistyka miasta
model czasoprzestrzenny
czasowe rytmy miejskie
miasto
city logistics
time-space model
urban cycle
city
Opis:
W artykule przybliżono jeden z kluczowych problemów logistyki miasta, którym jest wymiar czasowy i przestrzenny miasta. Celem artykułu jest ukazanie możliwości wykorzystania modelu czasoprzestrzeni w logistyce miasta. W dalszej części przedstawiono i opisano dzienne, tygodniowe, miesięczne i roczne rytmy miasta. Następnie scharakteryzowano model czasoprzestrzenny Hagerstranda, jego założenia istotę i własności oraz wskazano możliwości jego wykorzystania w badaniach i praktyce logistyki miasta.
This article analyses one of city logistics’ key issues. It concerns time and space dimension of cities . The aim of this study is to point out the possibilities of using time-space model in the city logistic. This paper describes daily, weekly, monthly and annual cycles in cities functioning of town and cities. Then there is a presentation of the Hagerstrand’s time-space model. The explains the essence, attributes, meaning and e general characteristic of the time-space model, which can be used for research and practical application in city logistics.
Źródło:
Gospodarka Materiałowa i Logistyka; 2018, 7; 24-29
1231-2037
Pojawia się w:
Gospodarka Materiałowa i Logistyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of regulatory skills in younger school pupils
Autorzy:
Maksatovna Knissarina, Malika
Aganina, K.Zh.
Abdykarimovna Bashbayeva, Muslima
Zame, Yuliya
Shaikhimov, Yerksh
Powiązania:
https://bibliotekanauki.pl/articles/2004968.pdf
Data publikacji:
2016-06-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
learning skills
development
educational and cognitive competence
regulatory skills
level of regulatory skills in younger school pupils
self-management
regulatory cycle
educational management
interschool management
game-technical management
younger school pupils time management
Opis:
The article presents a solution for one of the significant tasks in pedagogical science and practice, namely the development of regulatory skills in younger school pupils as a significant factor of their educational and cognitive competence development. The aim of our study was to conduct practical evaluation of the proposed program of the development of regulatory skills in younger school pupils. Scientific novelty consists in the created program of the development of regulatory skills in younger school pupils, which generally allow for increasing education and cognitive competence, which is the basis for pupils’ functional expertise, in accordance with the aims and tasks of the state-significance documentation. The study used logical and historical analysis of scientific literature on the topic, pedagogical observation, a survey, questionnaires, testing and a pedagogical experiment. Based on the obtained results, we developed educational and methodological recommendations for teachers on the topic of developing regulatory skills in young school pupils, as an elective class program for 2nd-grade pupils.
Źródło:
The New Educational Review; 2016, 44; 165-175
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficiency optimization of a closed indirectly fired gas turbine cycle working under two variable-temperature heat reservoirs
Autorzy:
Ma, Z.
Wu, J.
Powiązania:
https://bibliotekanauki.pl/articles/240010.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
obieg
technologie bioenergetyczne
termodynamika
turbina gazowa
wymiennik ciepła
Bioenergy technology
Cycle performance
finite time thermodynamics
High temperature heat exchanger
Indirectly fired gas turbine
Opis:
Indirectly or externally fired gas turbines (IFGT or EFGT) are interesting technologies under development for small and medium scale combined heat and power (CHP) supplies in combination with micro gas turbine technologies. The emphasis is primarily on the utilization of the waste heat from the turbine in a recuperative process and the possibility of burning biomass even "dirty" fuel by employing a high temperature heat exchanger (HTHE) to avoid the combustion gases passing through the turbine. In this paper, finite time thermodynamics is employed in the performance analysis of a class of irreversible closed IFGT cycles coupled to variable temperature heat reservoirs. Based on the derived analytical formulae for the dimensionless power output and efficiency, the efficiency optimization is performed in two aspects. The first is to search the optimum heat conductance distribution corresponding to the efficiency optimization among the hot- and cold-side of the heat reservoirs and the high temperature heat exchangers for a fixed total heat exchanger inventory. The second is to search the optimum thermal capacitance rate matching corresponding to the maximum efficiency between the working fluid and the high-temperature heat reservoir for a fixed ratio of the thermal capacitance rates of the two heat reservoirs. The influences of some design parameters on the optimum heat conductance distribution, the optimum thermal capacitance rate matching and the maximum power output, which include the inlet temperature ratio of the two heat reservoirs, the efficiencies of the compressor and the gas turbine, and the total pressure recovery coefficient, are provided by numerical examples. The power plant configuration under optimized operation condition leads to a smaller size, including the compressor, turbine, two heat reservoirs and the HTHE.
Źródło:
Archives of Thermodynamics; 2011, 32, 2; 3-20
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extraction of Tannic Acid from Kenaf Bast Fibre using Ultrasonic Assisted Extraction
Autorzy:
Mohamad, Mardawani
Ibrahim, H. A.
Nasir, M. F. M.
Mohidem, Nur Atikah
Shoparwe, N. F.
Teo, Pao Ter
Masri, Mohamad Najmi
Irfan, Abd Rahim
Powiązania:
https://bibliotekanauki.pl/articles/2134102.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ultrasonic assisted extraction
UAE
sonication time
duty cycle
extraction process
kenaf bast fibre
Opis:
Tannic acid or tannin, type of phenolic compound contains in kenaf bast fibre. Conventional extraction has certain limitations in terms of time, energy, and solvent consumption. Ultrasound assisted extraction (UAE) can extract bioactive components in shorter time, low temperature, with lesser energy and solvent requirement. UAE as alternative extraction technique is better equipped to retain the functionality of the bioactive compounds. In this study, the conditions for ultrasound assisted extraction (UAE) of tannic acid from kenaf bast fibre by assessing the effect of sonication time and different duty cycles were optimized. The use of ultrasound to extract tannic acid from kenaf bast fiber was evaluated. Ultrasound-assisted extraction (UAE) was carried out using ethanol as solvent to intensify the extraction efficacy. Phytochemical screening was conducted to identify the presence of tannic acid in extracts. The extracts then were analyzed using High-Performance Liquid Chromatography (HPLC) and Scanning Electron Microscopy (SEM). It was found that 0.2429 mg/mL of tannic acid was obtained under the extraction conditions of extraction temperature of 40℃, sonication time of 20 minutes and duty cycle of 50%. From SEM analysis, it was found that the raw sample demonstrated rough surface and no porous but kenaf bast fibre display smoother surface with less impurities and few pores appeared after the extraction process using UAE. These results indicate that ultrasound-assisted extraction is an efficient method for extracting tannic acid from kenaf bast fibre with the advantages of lower extraction time and higher extraction yield.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 3; 1061--1066
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Godzinki o Niepokalanym Poczęciu Najświętszej Maryi Panny. Glosy, hipotezy, interpretacje
Godzinki o Niepokalanym Poczęciu Najświętszej Maryi Panny [Officium parvum Conceptionis Immaculatae]. Statements, Hypotheses, Interpretations
Autorzy:
Sulikowski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/451095.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
The Little Office of the Immaculate Conception of the Holy Mary in the Polish tradition
Blessed Virgin in the European culture
language forms of sacrum presence
genres within a poetic cycle Biblical languages in the Little Office (Latin, Greek, Hebrew) mosaistic and Christian motifs stylistic tropes in the prayer within the Little Office
Biblical allusions and motifs prayer prosody and performing problems of the prayer
problem of archaisms preserved within the text performed nowadays
role of the Little Office in the spiritual life in Poland
changes in space and time concerning performing the prayer
Godzinki o Niepokalanym Poczęciu Najświętszej Maryi Panny w polskiej tradycji Najświętsza Maryja Panna w kulturze europejskiej
językowe formy obecności sacrum
gatunki w obrębie cyklu poetyckiego
języki biblijne w godzinkach (łacina, greka, hebrajski)
motywy mojżeszowe i chrześcijańskie
stylistyczne tropy w modlitwie godzinek
biblijne aluzje i motywy
prozodia modlitwy i problemy z jej odmawianiem
problem archaizmów zachowanych we współcześnie wykonywanym tekście
rola godzinek w duchowym życiu Polski
zmiany w czasie i przestrzeni dotyczące wykonywania modlitwy
Opis:
The article concerns an Old Polish matins to the Holy Mary from the 17th century, which were created as a sung prayer, especially for laics. Its composition is similar to the breviary office of the Catholic Church, whereas the versification is based on prominent poetry examples from the Polish Renaissance (Jan Kochanowski, Mikołaj Sęp Szarzyński et al.). The author states that this form of prayer was attacked or even ridiculed in the times of reformation and counter-reformation by Protestant writers. Thanks to philological analysis of every distich – with consideration of the European background – the author shows intense and direct relations of the text to the Bible in Renaissance translations (priest Jakub Wujek, the Gdańsk Bible) and sometimes also to Marian apocryphic texts. A crucial role is played here by the symbolism of numbers (especially 7, 3, 1) and the semantic differences in many lexemes and language forms of the virtually 16th century Polish, if compared with contemporary Polish. A full concretization of this poetic cycle becomes visible when the text is sung first – hence the musical and prosodic aspects of the Little Office: its melodic line, physiological effects as the deepening and regularity of the breath have been considered. This is the way the prayer influences the human body, it opens and purifies the spiritual space for the influence of God’s grace. The author localized the prayer within the daily cycle of Old Polish and contemporary civilization, he pointed out the radical changes in life habits within the last century and an evolution of folk spirituality. The Little Office also has its place in the weekly cycle whereby every part is assigned to one specific day of the week. During the philological and prosodic analysis potential performers of the Little Office in Old Poland from the circles of peasants and craftsmen were named. The text has been well acquired in the community for twenty generations – the Little Office is often sung from memory exclusively. Because of the sociological changes it pervaded, thanks to the Roman-Catholic liturgy, into the contemporary urban ceremonial. 1
Źródło:
Tematy i Konteksty; 2016, 6(11); 254-301
2299-8365
Pojawia się w:
Tematy i Konteksty
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Infrastructure for multi-floor virtual enterprises system
Infrastruktura multi-floor w systemach wirtualnych przedsiębiorstw
Autorzy:
Dzhuguryan, T.
Jóźwiak, Z.
Powiązania:
https://bibliotekanauki.pl/articles/113498.pdf
Data publikacji:
2016
Wydawca:
STE GROUP
Tematy:
system of multi-floor
flexible manufacturing
time of cycle
elevator
performance
system multi-floor
elastyczna produkcja
czas cyklu
transport pionowy
osiągi
Opis:
The multi-floor manufacturing is widely used in the megacities with high-density population due to the limited areas for industrial development and also the necessity of unloading transport streams. The article gives the analysis of an infrastructure for the multi-floor virtual enterprises system that allows allocating the components and studying their role in maintaining the main production. The conditions for the harmonization of the vertical transport carrying capacity and of the performance of a multi-floor assembly manufacturing are determined. The morphological analysis of ownership patterns of the fixed assets for the multi-floor virtual enterprises is defined. The article offers to define the enterprises-homes as system of multi-floor virtual workhouses.
Wytwarzanie multi-floor jest szeroko stosowane w wielkich miastach o dużej gęstości populacji z powodu ograniczonych obszarów dla rozwoju przemysłu, a także konieczności usprawnienia strumieni transportowych. Artykuł zawiera analizę infrastruktury, dla wielokondygnacyjnego systemu wirtualnych przedsiębiorstw. Analiza ta umożliwia przydzielanie komponentów i badanie ich roli w utrzymaniu produkcji głównej. W artykule ustalono warunki dotyczące harmonizacji pionowego transportu, ładowności oraz wykonania produkcji montażowej multifloor. Ponadto przeprowadzono morfologiczną analizę wzorców własności środków trwałych dla wielokondygnacyjnych wirtualnych przedsiębiorstw. W artykule proponuje się zdefiniowanie przedsiębiorstwa - domu, jako systemu multi-floor wirtualnych przedsiębiorstw.
Źródło:
Systemy Wspomagania w Inżynierii Produkcji; 2016, 3 (15); 70-78
2391-9361
Pojawia się w:
Systemy Wspomagania w Inżynierii Produkcji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Markov Model of Cyber Attack Life Cycle Triggered by Software Vulnerability
Autorzy:
Hoffmann, Romuald
Powiązania:
https://bibliotekanauki.pl/articles/1844613.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Markov model
cyber-attack
vulnerability
life cycle
homogenous Markov process
continuous time Markov chain
Opis:
Software vulnerability life cycles illustrate changes in detection processes of software vulnerabilities during using computer systems. Unfortunately, the detection can be made by cyber-adversaries and a discovered software vulnerability may be consequently exploited for their own purpose. The vulnerability may be exploited by cyber-criminals at any time while it is not patched. Cyber-attacks on organizations by exploring vulnerabilities are usually conducted through the processes divided into many stages. These cyber-attack processes in literature are called cyber-attack live cycles or cyber kill chains. The both type of cycles have their research reflection in literature but so far, they have been separately considered and modeled. This work addresses this deficiency by proposing a Markov model which combine a cyber-attack life cycle with an idea of software vulnerability life cycles. For modeling is applied homogeneous continuous time Markov chain theory.
Źródło:
International Journal of Electronics and Telecommunications; 2021, 67, 1; 35-41
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modern Technology Revolution For Security
Autorzy:
Necas, P.
Kelemen, M.
Powiązania:
https://bibliotekanauki.pl/articles/328986.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
bezpieczeństwo
terroryzm
zagrożenie
bezpieczeństwo energetyczne
innowacje
nowe technologie
strategia międzynarodowa
Afganistan
technology transformation
military transformation
security technology
risk-threat-vulnerability
life-time cycle
Afghanistan
national strategies
emerging technology
energy security
innovative approach
Opis:
The global dimension of future security threats is of paramount importance. Whilst technological advancements will continue to be the basis of wealth for many nations, terrorism is likely to continue to be the harbinger of a pervasive sense of insecurity amongst populations. Increasingly, energy security will be the driver of many key strategic decisions, creating dynamic and unstable inter-state interactions in the process. With the international system itself experiencing a period of profound flux, some of the institutions that are charged with managing global problems may be overwhelmed. The likelihood of great power conflict escalating into total war is lower than at any time in the past century but weak governments, lagging economies, mass migration, WMD proliferation, religious extremism, and youth bulges, will align to generate the conditions for internal regional conflicts with global impact, backed by the Revolution in Military Affairs.
Źródło:
Diagnostyka; 2010, 1(53); 13-18
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monetary determinants of output dynamics in the light of the structural vector-autoregressive SVAR model: a Keynesian approach
Autorzy:
Kołbyko, Patryk Norbert
Powiązania:
https://bibliotekanauki.pl/articles/20312085.pdf
Data publikacji:
2024
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
endogenous money creation
macroeconometrics
monetary theory of the business cycle
time series decomposition
structural vector-autoregressive model
Opis:
PURPOSE: The purpose of the following paper is to analyze and empirically verify the monetary theory of business cycles as a mechanism for the interaction of the dynamics of production and money supply based on the example of the Polish economy. In order to identify and mitigate the risk of economic fluctuations as a function of the response of the central bank, it is necessary to conduct an extensive analysis of the indirect mechanism of transmission of monetary impulses on production in the economy. DESIGN/METHOD: Empirical analysis was carried out by estimating a macroeconometric time series model taking into account the inductive information based on the Keynesian theory the structural vector-autoregressive SVAR model. The stochastic process included in the study was based on statistical data of Poland, which were obtained from the cyclical reports: ‘Preliminary estimate of gross domestic product’ and ‘Quarterly accounts of gross domestic product in 2017-2021’, Poland’s Central Statistical Office and the National Bank of Poland's databases for the time interval of 2007.Q1-2022.Q2. RESULTS/FINDINGS: The applied empirical analysis positively verified the existence of an indirect monetary impulse transmission mechanism in Poland’s economy. The obtained research has positively verified the compatibility of the monetary theory of the business cycle in terms of the Keynesian theory with the macroeconomic reality in Poland. The results of the research justify the measures to mitigate the risk of economic instability and impose a requirement for discretionary policy by the National Bank of Poland. ORIGINALITY/VALUE: The following work addresses an important element of the macroeconomic analysis, specifically the monetary theory of the business cycle. The originality of the work stems from the empirical attempt to verify the monetary theory of the business cycle taking into account the indirect mechanism of transmission of monetary impulses on the grounds of the statistical data from the Polish economy.
Źródło:
Studies in Risk and Sustainable Development; 2024, 398; 1-19
2720-6300
Pojawia się w:
Studies in Risk and Sustainable Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mutual relationships between the unemployment rate and the unemployment duration in the Visegrad Group countries in years 2001?2017
Autorzy:
Dmytrów, Krzysztof
Bieszk-Stolorz, Beata
Powiązania:
https://bibliotekanauki.pl/articles/22446437.pdf
Data publikacji:
2019
Wydawca:
Instytut Badań Gospodarczych
Tematy:
registered unemployment rate
unemployment duration
business cycle clock
Dynamic Time Warping
Visegrad Group countries
Opis:
Research background: The most important indicators that describe the situation on the labour market are the unemployment rate and the unemployment duration. If both these indicators are high, then the human capital deteriorates. Therefore, it seems justified to analyse the mutual relationships between them. Purpose of the article: The article aims at finding the relationships between the unemployment rate and the unemployment duration, and checking if the mutual courses of these two indicators in the Visegrad Group countries are connected with each other. Methods: The business cycle clock methodology will be used to analyse the relationship between the unemployment rate and the median unemployment duration. Next, the similarity of the course of these two indicators will be analysed by means of the Pearson product-moment correlation coefficient and the Dynamic Time Warping (DTW) technique. Findings & Value added: Amongst the analysed countries, Czechia, Poland and Slovakia were, to a certain degree, similar with respect to the mutual course of the unemployment rate and the unemployment duration. Until the peak of the financial crisis in 2009, the unemployment rate and the unemployment duration decreased. During the next years, the unemployment rate was increasing and after 2-3 years it was followed by the increase of the unemployment duration. The situation improved after the year 2013 ? both indicators were decreasing. In Hungary, on the contrary, the unemployment rate was increasing or steady until 2012, and during the following years it started to decrease. However, the course of the unemployment duration was completely different than in remaining countries. The value added of the article is application of the business clock cycle and the Dynamic Time Warping technique in finding the relationships and similarity of courses between the unemployment rate and the unemployment duration.
Źródło:
Equilibrium. Quarterly Journal of Economics and Economic Policy; 2019, 14, 1; 129-148
1689-765X
2353-3293
Pojawia się w:
Equilibrium. Quarterly Journal of Economics and Economic Policy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance Analysis of an Atkinson Cycle Engine under Effective Power and Effective Power Density Conditions
Autorzy:
Gonca, G.
Powiązania:
https://bibliotekanauki.pl/articles/1033412.pdf
Data publikacji:
2017-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
gasoline engine
Atkinson cycle
engine performance
power density
finite-time thermodynamics
Opis:
This study presents performance optimization of an Atkinson cycle engine using criteria named as effective power and effective power density conditions. The effects of design and operating parameters such as compression ratio, cycle pressure ratio, cycle temperature ratio, equivalence ratio, bore/stroke ratio, inlet temperature, inlet pressure, engine speed, friction coefficient, mean piston speed and stroke length, on the performance characteristics have been examined. Moreover, the energy losses have been determined as fuel energy and they have been classified as incomplete combustion losses, friction losses, heat transfer losses, and exhaust output losses. Realistic values of specific heats have been used depending on temperature of working fluid. The results of the study can be assessed as an engineering tool by the Atkinson cycle engine designers.
Źródło:
Acta Physica Polonica A; 2017, 132, 4; 1306-1313
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł

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