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Wyświetlanie 1-15 z 550
Tytuł:
Theoretical study of the motion characteristics of a variable length connecting rod mechanism
Autorzy:
Chen, Jiadui
Liu, Qinghua
Yang, B.
Powiązania:
https://bibliotekanauki.pl/articles/38882766.pdf
Data publikacji:
2022
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
variable length connecting rod engine
variable stroke
variable compression ratio
kinematic model
piston movement process
Opis:
The sustainable development of society calls for automobile engines with high efficiency and very low pollutant emission. The variable compression ratio (VCR) technique is one of the effective methods to deal with this issue. Engines with variable length connecting rod (VLEs) yield higher efficiency than other VCR engines. This paper focuses on a variable length connecting rod mechanism that achieves a VCR by changing the positions of the bottom dead center (BDC) and the top dead center (TDC) (controlled by the rotation of the eccentric sleeve) relative to the crankshaft. A kinematic model is also proposed to calculate and analyze the motion characteristics of the variable length connecting rod mechanism. The effects of eccentric size and eccentric phase on the piston motion, the TDC and BDC positions, the stroke length, the crank angles at TDC and BDC, and the compression ratio are studied in detail. It is found that the piston exhibits good motion characteristics with proper eccentric size and eccentric phase, and the compression ratio can be adjusted by varying the eccentric phase with proper eccentric size. A comparison between the proposed mechanism with another mechanism is also conducted. Therefore, this work can serve as a necessary reference for designing, analyzing, and optimizing VLEs.
Źródło:
Engineering Transactions; 2022, 70, 1; 3-22
0867-888X
Pojawia się w:
Engineering Transactions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Economic statistical design of variable sampling interval X̅ control chart based on surrogate variable using genetic algorithms
Autorzy:
Lee, T.-H.
Hong, S.-H.
Kwon, H.-M.
Lee, M.
Powiązania:
https://bibliotekanauki.pl/articles/406970.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
economic design
surrogate variable
variable sampling interval
TRISO Fuel
genetic algorithms
Opis:
In many cases, a X̅ control chart based on a performance variable is used in industrial fields. Typically, the control chart monitors the measurements of a performance variable itself. However, if the performance variable is too costly or impossible to measure, and a less expensive surrogate variable is available, the process may be more efficiently controlled using surrogate variables. In this paper, we present a model for the economic statistical design of a VSI (Variable Sampling Interval) X̅ control chart using a surrogate variable that is linearly correlated with the performance variable. We derive the total average profit model from an economic viewpoint and apply the model to a Very High Temperature Reactor (VHTR) nuclear fuel measurement system and derive the optimal result using genetic algorithms. Compared with the control chart based on a performance variable, the proposed model gives a larger expected net income per unit of time in the long-run if the correlation between the performance variable and the surrogate variable is relatively high. The proposed model was confined to the sample mean control chart under the assumption that a single assignable cause occurs according to the Poisson process. However, the model may also be extended to other types of control charts using a single or multiple assignable cause assumptions such as VSS (Variable Sample Size) X̅ control chart, EWMA, CUSUM charts and so on.
Źródło:
Management and Production Engineering Review; 2016, 7, 4; 54-64
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Random fuzzy Poisson processes
Autorzy:
Guo, R.
Nyirenda, J.
Guo, D.
Powiązania:
https://bibliotekanauki.pl/articles/2069685.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
credibility measure
credibilistic fuzzy variable
random fuzzy variable
average chance distribution
Opis:
Poisson processes, particularly the time-dependent extension, play important roles in reliability and risk analysis. It should be fully aware that the Poisson modeling in the current reliability engineering and risk analysis literature is merely an ideology under which the random uncertainty governs the phenomena. In other words, current Poisson Models generate meaningful results if randomness assumptions hold. However, the real world phenomena are often facing the co-existence reality and thus the probabilistic Poisson modeling practices may be very doubtful. In this paper, we define the random fuzzy Poisson process, explore the related average chance distributions, and propose a scheme for the parameter estimation and a simulation scheme as well. It is expecting that a foundational work can be established for Poisson random fuzzy reliability and risk analysis.
Źródło:
Journal of Polish Safety and Reliability Association; 2009, 1; 113--122
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental analysis of linear induction motor under variable voltage variable frequency (VVVF) power supply
Autorzy:
Wakode, P. D.
Tariq, M.
Bhattacharya, T. K.
Powiązania:
https://bibliotekanauki.pl/articles/136237.pdf
Data publikacji:
2016
Wydawca:
EEEIC International Barbara Leonowicz Szabłowska
Tematy:
Linear Induction Motor
Variable Voltage Variable Frequency
experimental
air gap flux density
Opis:
This paper presents the complete analysis of Linear Induction Motor (LIM) under VVVF. The complete variation of LIM air gap flux under ‘blocked Linor’ condition and starting force is analyzed and presented when LIM is given VVVF supply. The analysis of this data is important in further understanding of the equivalent circuit parameters of LIM and to study the magnetic circuit of LIM. The variation of these parameters is important to know the LIM response at different frequencies. The simulation and application of different control strategies such as vector control thus becomes quite easy to apply and understand motor’s response under such strategy of control.
Źródło:
Transactions on Environment and Electrical Engineering; 2016, 1, 2; 18-24
2450-5730
Pojawia się w:
Transactions on Environment and Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research of Disturbance in Model of Linear Regression Estimated According to Criteria of Least Squares
Analiza zakłóceń w modelu regresji liniowej w porównaniu do klasycznej metody najmniejszych kwadratów
Autorzy:
Wagner, Wiesław
Budka, Anna
Powiązania:
https://bibliotekanauki.pl/articles/1358350.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
linear regression
method of least squares
disturbance
disturbed dependent variable
disturbed independent variable
Opis:
W pracy przedstawiono wyniki analiz numerycznych związanych z estymacją stopnia zakłócenia współczynników występujących w równaniu prostej regresji.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2003, 164; 39-50
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variable Ratio Sample Rate Conversion Based on Fractional Delay Filter
Autorzy:
Blok, M.
Drózda, P.
Powiązania:
https://bibliotekanauki.pl/articles/177050.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sample rate conversion
offset window method
variable fractional delay filter
variable resampling ratio
Opis:
In this paper a sample rate conversion algorithm which allows for continuously changing resampling ratio has been presented. The proposed implementation is based on a variable fractional delay filter which is implemented by means of a Farrow structure. Coefficients of this structure are computed on the basis of fractional delay filters which are designed using the offset window method. The proposed approach allows us to freely change the instantaneous resampling ratio during processing. Using such an algorithm we can simulate recording of audio on magnetic tape with nonuniform velocity as well as remove such distortions. We have demonstrated capabilities of the proposed approach based on the example of speech signal processing with a resampling ratio which was computed on the basis of estimated fundamental frequency of voiced speech segments.
Źródło:
Archives of Acoustics; 2014, 39, 2; 231-242
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Innovativeness of bioeconomy in Poland in the field of reuse of wastes in 2013 (spatial analysis)
Innowacyjność biogospodarki w Polsce w zakresie wykorzystania odpadów w 2013 roku (studium przestrzenne)
Autorzy:
Kukuła, K.
Powiązania:
https://bibliotekanauki.pl/articles/2051995.pdf
Data publikacji:
2016
Wydawca:
Akademia Bialska Nauk Stosowanych im. Jana Pawła II w Białej Podlaskiej
Tematy:
innovativeness
bioeconomy
Polska
reuse field
waste
spatial analysis
innovation
diagnostic variable
synthetic variable
Opis:
The article presents results of study on innovativeness of bioeconomy in Poland in the field of reuse of wastes. The research was carried out on the basis of a spatial reference system of voivodeships in reference to data from 2013. Innovativeness of bioeconomy in rational reuse of wastes is a complex phenomenon which is described by means of selected diagnostic variables. Subsequently, the method of the scope of multidimensional comparative analysis, that results in formulation of ranking with regard to the level of an examined complex phenomenon was described. Further the method proposed by author was applied and on its basis the objects (voivodeships) were categorized into four groups. The leading positions are occupied by the following voivodeships: Masovian, Silesian, Lower Silesian. Last places in the raking are taken by voivodeships located in the eastern part of the country and include the following voivodeships: Świętokrzyskie, Lubuskie, Opolskie. These voivodeships constitute the forth group, namely the most numerous but, at the same time, the weakest.
Artykuł przedstawia wyniki badań nad innowacyjnością biogospodarki w Polsce w zakresie wykorzystania odpadów. Badania przeprowadzono w układzie przestrzennym województw w oparciu o informacje z 2013 roku. Innowacyjność biogospodarki w racjonalnym wykorzystywaniu odpadów stanowi zjawisko złożone, które opisuje zestaw wybranych zmiennych diagnostycznych. Następnie opisano metodę z zakresu wielowymiarowej analizy porównawczej, która doprowadza do budowy rankingu ze względu na poziom analizowanego zjawiska złożonego. W dalszej kolejności obiekty (województwa) podzielono stosując proponowaną przez autora metodę podziału na 4 grupy. Czołowe lokaty zajmują województwa: mazowieckie, śląskie i dolnośląskie. Ostatnie miejsce w rankingu przypadają na województwa Ściany Wschodniej oraz na województwa: świętokrzyskie, lubuskie i opolskie. Województwa te tworzą najliczniejszą a zarazem najsłabszą grupę czwartą.
Źródło:
Economic and Regional Studies; 2016, 09, 2; 76-86
2083-3725
2451-182X
Pojawia się w:
Economic and Regional Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
INTER-INDUSTRIAL VALUE MIGRATION
Autorzy:
Siudak, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/453146.pdf
Data publikacji:
2014
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki
Tematy:
value migration
synthetic variable
industry
Opis:
In this paper there is discussed value migration from the perspective of all economic sectors. It was introduced the method for measuring the sectorial value migration and the algorithm for classification with respect to three stages value migration model. The value migration measurement was conducted employing multivariate comparative analyses and in particular linear ordering to construct a synthetic variable of development. On the basis of the proposed measure, the ranking of value migration development and classification of sectors to the particular phases of value migration processes were delivered.
Źródło:
Metody Ilościowe w Badaniach Ekonomicznych; 2014, 15, 2; 232-241
2082-792X
Pojawia się w:
Metody Ilościowe w Badaniach Ekonomicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Little pro’s, but how many of them? – On 3SG null pronominals in Hungarian
Autorzy:
Dalmi, Gréte
Powiązania:
https://bibliotekanauki.pl/articles/1040224.pdf
Data publikacji:
2017-12-30
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II
Tematy:
null pronominal
generic
bound variable
Opis:
While Hungarian 3SG individual reference null pronominals are in free variation with their lexical counterparts, 3SG generic reference null pronominals do not show such variation. This follows from the fact that Hungarian 3SG generic null pronominals behave like bound variables, i.e. they always require a 3SG generic lexical antecedent in an adjacent clause. Both the 3SG generic lexical antecedent and the 3SG generic null pronominal must be in the scope of the GN operator, which is seated in SpeechActParticipantPhrase (SAPP), the leftmost functional projection of the left periphery in the sentence (see Alexiadou & D’Alessandro, 2003; Bianchi, 2006). GN binds all occurrences of the generic variable in accessible worlds (see Moltmann 2006 for English one/oneself). These properties distinguish Hungarian from the four major types of Null Subject Languages identified by Roberts & Holmberg (2010).
Źródło:
Linguistics Beyond and Within; 2017, 3; 61-73
2450-5188
Pojawia się w:
Linguistics Beyond and Within
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The problem of the calculation of the frequency of diagnostic examinations based on device’s proper operation time
Autorzy:
Rudnicki, J.
Powiązania:
https://bibliotekanauki.pl/articles/2073666.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
reliability
diagnostic
Gaussian random variable
Opis:
The paper presents the proposal to apply the normal distribution to solve the problemof the frequency of diagnostic tests. Particular emphasis is placed on simplicity of the method. This method may be useful for the average user technical system. The method reduces the number of assumptions to a minimum. The results do not raise of serious doubts but they require verification of course.
Źródło:
Journal of Polish CIMEEAC; 2015, 10, 1; 139--147
1231-3998
Pojawia się w:
Journal of Polish CIMEEAC
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An entropy based non-wrapper approach for choosing variables in cluster analysis
Autorzy:
Korzeniewski, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/657955.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
cluster analysis
entropy
variable choice
Opis:
W artykule badamy sprawność algorytmu wybierania zmiennych w analizie skupień opartego na entropii (por. Dash, Liu, 2000). Ocena oparta jest na eksperymencie, w którym zbiory generowane są w postaci mieszanin rozkładów normalnych. Wyniki wskazują na to. że metoda nie radzi sobie tak dobrze jak to sugerowali Autorzy.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2011, 255
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermodynamical analysis for a variable generalized Chaplygin gas
Autorzy:
Malaver, Manuel
Powiązania:
https://bibliotekanauki.pl/articles/1182756.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Exotic matter
Inversion temperature
Joule-Thomson coefficient
Variable Chaplygin gas
Variable generalized Chaplygin gas
Opis:
Considering the work of Panigrahi (2015) and Panigrahi and Chatterjee (2016), in this paper we study some properties of variable generalized Chaplygin gas (VGCG) model, exotic matter used in some cosmological theories whose equation of state is (..) where (..). We obtain an analytical expression for Joule-Thomson coefficient and we have deduced the inversion temperature for variable and variable generalized Chaplygin gas. We investigate the thermodynamical behavior for VGCG model in different process.
Źródło:
World Scientific News; 2017, 66; 149-162
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of binary data transformation in categorical data clustering
Autorzy:
Cibulková, Jana
Šulc, Zdenek
Sirota, Sergej
Rezanková, Hana
Powiązania:
https://bibliotekanauki.pl/articles/1194463.pdf
Data publikacji:
2019-07-02
Wydawca:
Główny Urząd Statystyczny
Tematy:
hierarchical cluster analysis
nominal variable
binary variable
categorical data
similarity measures
evaluation criteria
generated data
Opis:
This paper focuses on hierarchical clustering of categorical data and compares two approaches which can be used for this task. The first one, an extremely common approach, is to perform a binary transformation of the categorical variables into sets of dummy variables and then use the similarity measures suited for binary data. These similarity measures are well examined, and they occur in both commercial and non-commercial software. However, a binary transformation can possibly cause a loss of information in the data or decrease the speed of the computations. The second approach uses similarity measures developed for the categorical data. But these measures are not so well examined as the binary ones and they are not implemented in commercial software. The comparison of these two approaches is performed on generated data sets with categorical variables and the evaluation is done using both the internal and the external evaluation criteria. The purpose of this paper is to show that the binary transformation is not necessary in the process of clustering categorical data since the second approach leads to at least comparably good clustering results as the first approach.
Źródło:
Statistics in Transition new series; 2019, 20, 2; 33-47
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatial Analysis of Coastal Vulnerability Index to Sea Level Rise in Biak Numfor Regency (Indonesia)
Autorzy:
Rumahorbo, Basa T.
Warpur, Maklon
Tanjung, Rosye H. R.
Hamuna, Baigo
Powiązania:
https://bibliotekanauki.pl/articles/24201621.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
spatial mapping
coastal vulnerability
coastal geologic variable
physical process variable
sea level rise
Biak Island
Opis:
Assessing the vulnerability of coastal areas is important in evaluating impact of sea level rise due to global climate change. This study aimed to spatially analyze and map the vulnerability level of the Biak Numfor Regency’s coastal area on Biak Island to the threat of sea level rise. The study area is limited to 500 m from the coastline and is divided into 383 grid cells. The Coastal Vulnerability Index (CVI) method was used to map the level of vulnerability of coastal areas based on four coastal geological variables (coastal elevation, coastal slope, geomorphology, and shoreline change) and three ocean physical process variables (tidal range, average significant wave height, and relative sea level rise). The results showed that the coastal areas of Biak Numfor Regency, belonging to the low, medium and high-risk vulnerability categories, were 77,685.63 km (32.18%), 159,084.38 km (65.74%), and 5,024.96 km (2.08%), respectively. The variables that contribute significantly to the level of vulnerability are coastal elevation, coastal slope, coastal geomorphology, and shoreline changes due to abrasion compared to tidal range, significant wave heights, and sea level rise rates. Vulnerability studies of other variables that can contribute to the vulnerability of coastal areas are needed, such as socio-economic variables and the impact of human activities on changes in the coastal environment, to obtain a comprehensive CVI value in supporting coastal mitigation planning efforts against sea level rise disasters so that they are more focused.
Źródło:
Journal of Ecological Engineering; 2023, 24, 3; 113--125
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Proces ryzyka z zależnymi okresami między wypłatami - analiza prawdopodobieństwa ruiny
Risk Process with Dependent Interclaim Times - Analysis of Probability of Ruin
Autorzy:
Heilpern, Stanisław
Powiązania:
https://bibliotekanauki.pl/articles/590422.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Ekonomiczny w Katowicach
Tematy:
Ryzyko
Zmienne losowe
Random variable
Risk
Opis:
The paper is devoted to the risk process with dependent interclaim times. The influence of degree of dependence of interclaims on the probability of ruin is investigated. The case of the strict dependence and the case when the dependence structure is described by the Archimedean copula is studied. The localization of the extreme values of the probability of ruin essentially depends on the value of initial capital. The most values of the probability of ruin are attain for the middle values of degree of dependence.
Źródło:
Studia Ekonomiczne; 2013, 133; 7-19
2083-8611
Pojawia się w:
Studia Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 550

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