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Wyszukujesz frazę "linear index" wg kryterium: Temat


Tytuł:
Wskaźnik liniowy alternatywą dla masowego wskaźnika przy ocenie zużycia lemieszy płużnych
The linear index as alternative of the mass index for evaluation of wear of ploughshares
Autorzy:
Kostenecki, P.
Powiązania:
https://bibliotekanauki.pl/articles/334325.pdf
Data publikacji:
2008
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych
Tematy:
wskaźnik liniowy
zużycie
lemiesz płużny
linear index
ploughshares
wear
Opis:
Wyniki porównywania intensywności zużycia takich samych lemieszy płużnych pracujących w różnych warunkach glebowych, przy zastosowaniu do oceny zużycia lemieszy metody wagowej, mogą być obarczone znacznym błędem. Podobnie jest w przypadku porównywania zużycia nienapawanych i napawanych lemieszy pracujących w takich samych warunkach. Wartość stosownych w metodzie wagowej wskaźników w dużym stopniu zależy od czynników, które nie są związane ze stanem granicznego zużycia elementów. Metoda wagowa staje się nieprzydatną, gdy w badaniach oceniane są lemiesze różniące się kształtem. Istnieje więc potrzeba opracowania wiarygodnych wskaźników oceny intensywności zużycia lemieszy. Do oceny zaproponowano wskaźnik, w którym kluczowe znaczenie ma zmiana obrysu lemieszy.
The results of comparing of the wear of the same ploughshares working in different soil conditions, when the weight method to evaluation of their wear is used, may be burdened with considerable error. It is alike in the case of comparing of wear of unpadded and padded shares of the same shape and working in the same conditions. The values of indexes used in the weight method significantly depend on factors which are not connected with the state of limitary wear of elements. Weight method becomes useless when the shares differing with shape are estimated in investigations. Then there exists the need to elaborate credible assessment coefficients of wear intensity of shares. The coefficient, in which key meaning has the change of contour of shares, was proposed in the paper.
Źródło:
Journal of Research and Applications in Agricultural Engineering; 2008, 53, 1; 35-39
1642-686X
2719-423X
Pojawia się w:
Journal of Research and Applications in Agricultural Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Broadband fluorescence emission and laser demonstration in large mode waveguide structure in Yb3+ doped germanate glass
Autorzy:
Khalid, Mamoona
Powiązania:
https://bibliotekanauki.pl/articles/1835769.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
germanate glass
ultrafast waveguide writing
near-infrared laser operation
high linear refractive index
nonlinear refractive index
Opis:
A stable composition (against crystallization) of germanate glass doped with Yb3+ for mid-infrared laser applications is presented. Broad emission spectrum of Yb3+ was obtained for the fabricated glass. Laser operation was demonstrated in 13 mm long waveguide written in the glass using a femtosecond laser operating at 524 nm center wavelength sending 250 fs ultrashort pulses. The resulting CW laser operated at 1.04 μm in the fundamental mode of the waveguide. The propagation loss through the waveguide was 0.6 dB/cm at 1550 nm for 45 μm diameter of the modified structure. The mode analysis of the developed waveguide structure is also presented in COMSOL Multiphysics to study the electric field distribution through different modes of propagation in the waveguide and the confinement loss associated to them.
Źródło:
Optica Applicata; 2021, 51, 1; 75-85
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fixed final time and free final state optimal control problem for fractional dynamic systems – linear quadratic discrete-time case
Autorzy:
Dzieliński, A.
Czyronis, P. M.
Powiązania:
https://bibliotekanauki.pl/articles/201358.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fractional order systems
discrete-time systems
optimal control
linear quadratic performance index
Opis:
The optimization problem for fractional discrete-time systems with a quadratic performance index has been formulated and solved. The case of fixed final time and a free final state has been considered. A method for numerical computation of optimization problems has been presented. The presented method is a generalization of the well-known method for discrete-time systems of integer order. The efficiency of the method has been demonstrated on numerical examples and illustrated by graphs. Graphs also show the differences between the fractional and classical (standard) systems theory. Results for other cases of the fractional system order (coefficient ) and not illustrated with numerical examples have been obtained through a computer algorithm written for this purpose.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 3; 681-690
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An algorithm for the solution of the traveling salesman problem via disjunctive graphs
Autorzy:
Grabowski, Józef
Powiązania:
https://bibliotekanauki.pl/articles/748529.pdf
Data publikacji:
1978
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Directed graphs (digraphs), tournaments
Scheduling theory, deterministic
Special problems of linear programming(transportation, multi-index, etc.)
Opis:
.
From the introduction: "The traveling salesman problem is a problem of combinatorial type. Although problems of this type sometimes have a relatively simple formulation, there are many difficulties associated with their solution even when the most up-to-date computers are used. In the 1970s many papers have been devoted to this problem. The purpose of the vast majority of them has been to find more effective solution algorithms. "In this paper we give the solution of the traveling salesman problem via disjunctive graphs. Up to now the elements of disjunctive graphs have been used to solve problems connected with the determination of an optimal task completion sequence.''
Źródło:
Mathematica Applicanda; 1978, 6, 13
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Connective Eccentric Index of an infinite family of linear polycene parallelogram benzenoid
Autorzy:
Farahani, M. R.
Powiązania:
https://bibliotekanauki.pl/articles/411891.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
molecular graphs
linear polycene parallelogram
benzenoid
eccentric connectivity index
connective eccentric index
Opis:
Let G=(V, E) be a graph, where V(G) is a non-empty set of vertices and E(G) is a set of edges. We defined dv denote the degree of vertex v∈V(G). The Eccentric Connectivity index ξ(G) and the Connective Eccentric index Cξ(G) of graph G are defined as ξ(G)= [wzór] and Cξ(G)=[wzór] where ε(v) is defined as the length of a maximal path connecting a vertex v to another vertex of G. In this present paper, we compute these Eccentric indices for an infinite family of linear polycene parallelogram benzenod by a new method.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 18; 57-62
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wielowymiarowa analiza atrakcyjności inwestycyjnej spółek sektora spożywczego notowanych na Giełdzie Papierów Wartościowych w Warszawie
Multivariate investment attractiveness analysis of food sector companies of Warsaw Stock Exchange
Autorzy:
Kijek, Arkadiusz
Powiązania:
https://bibliotekanauki.pl/articles/425056.pdf
Data publikacji:
2014
Wydawca:
Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:
investment attractiveness index
linear ordering
portfolio analysis
optimization
Opis:
The article presents the results of study of investment attractiveness of food sector companies listed at the Warsaw Stock Exchange. The multivariate statistical methods are applied to evaluate the financial standing of companies. The author constructs the investment attractiveness index that is used to order companies by their economic and financial standing. Based on the values of investment attractiveness index the structure of optimal portfolios are determined according to Markowitz portfolio theory. The results of survey indicate directions of investment portfolio diversification.
Źródło:
Econometrics. Ekonometria. Advances in Applied Data Analytics; 2014, 4(46); 175-188
1507-3866
Pojawia się w:
Econometrics. Ekonometria. Advances in Applied Data Analytics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermally treated clay as a stabilizing agent for expansive clayey soil: some engineering properties
Autorzy:
Al-Swaidani, A. M.
Hamood, I.
Meziab, A.
Powiązania:
https://bibliotekanauki.pl/articles/178836.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
thermally treated clay
soil improvement
plasticity index
linear shrinkage
Opis:
The objective of this research was to investigate the effect of adding thermally treated clay on some engineering properties of the untreated expansive clayey soil. Three expansive clayey soil samples obtained from three different sites in the south of Syria have been investigated. They were thermally treated up to three different levels (450°C, 650°C and 850°C) for 3 hours. Three replacement levels of thermally treated clay were used, i.e. 0%, 10% and 20%. The X-ray diffractometer (XRD) technique has been used to detect the crystalline and glassy phase in the clayey samples before and after the thermal treatment. Pozzolanic activity of the thermally treated clayey soil has been studied using the modified Chapelle test and the mechanical strength test at each of the temperature levels. Atterberg limits, compaction, free swell, swelling pressure and linear shrinkage have particularly been investigated. Test results revealed the positive effect of thermally treated clay when added to the natural soil. Plasticity index (PI) was reduced by about 60% when 20% thermally treated clay was added to the natural soil. In addition, 6% lime was added to further investigate the combined effect of lime and calcined clay on the properties of the clayey expansive soil. All investigated properties were significantly improved when 20% thermally treated soil and 6% lime were added together. For instance, swelling pressure and linear shrinkage values were reduced to less than 15% or even much less when compared with those of the natural soil. Scanning electron microscopy (SEM) and energydispersive X-ray (EDX) analysis were employed as well.
Źródło:
Studia Geotechnica et Mechanica; 2018, 40, 3; 220-232
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The evaluation of competitive position of EU-28 economies with using global multi-criteria indices
Autorzy:
Kiseľáková, Dana
Šofranková, Beáta
Onuferová, Erika
Čabinová, Veronika
Powiązania:
https://bibliotekanauki.pl/articles/22446406.pdf
Data publikacji:
2019
Wydawca:
Instytut Badań Gospodarczych
Tematy:
Global Competitiveness Index
multi-criteria indices
EU-28 economies
multiple linear regression analyses
Opis:
Research background: Under the current conditions of increasing competitiveness and interdependence, national economies are more influenced by the global business environment and its development. Constantly changing economic, social, political aspects, and many other factors, cause the differences in the global competitiveness of economies, so the economies are forced to analyze their competitive level more complexly. Despite that, there is a lack of research studies analyzing the international competitiveness of EU-28 economies from the point of view various multi-criteria indices. Purpose of the article: The paper investigates the relations between the Global Competitiveness Index (GCI) and other selected multi-criteria indices, namely the Global Innovation Index (GII), the Doing Business Index (DBI), the Economic Freedom Index (EFI) and the Corruption Perceptions Index (CPI) in the case of EU?28 economies. Methods: In order to investigate the relations between the global competitiveness and selected multi-criteria indices affecting the EU?28 economies, the multiple linear regression analyses were applied. The multiple regression model was quantified for every single year, as well as, the regression model using the average score of all analyzed indices. The secondary data concerning the scores of individual indices were collected based on annually published online reports over the period of 2014?2018. Findings & Value added: The research confirmed that there is a statistically significant dependence between the global competitiveness, corruption and the level of innovation potential within the EU?28 economies. Besides, we identified the worst results in the context of competitiveness evaluation especially in the area of corruption and innovation activities. In this regard, the issue of insufficient innovation development and inappropriate corruption perception is considered to be key determinants influencing the assessment of the global competitiveness of the EU?28 member states. In our opinion, to improve the competitiveness of these countries, targeted activities should be implemented in the frame of national competitive strategies, programs, and policies.
Źródło:
Equilibrium. Quarterly Journal of Economics and Economic Policy; 2019, 14, 3; 441-462
1689-765X
2353-3293
Pojawia się w:
Equilibrium. Quarterly Journal of Economics and Economic Policy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of entire solutions of some linear PDEs
Autorzy:
Bandura, A,
Skaskiv, O.
Filevych, P.
Powiązania:
https://bibliotekanauki.pl/articles/122451.pdf
Data publikacji:
2017
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
linear partial differential equation
entire function
bounded L-index in direction
bounded l-index
homogeneous linear differential equation
growth of solutions
liniowe równanie różniczkowe cząstkowe
funkcja całkowita
równanie różniczkowe cząstkowe
Opis:
In this paper, there are improved sufficient conditions of boundedness of the L-index in a direction for entire solutions of some linear partial differential equations. They are new even for the one-dimensional case and L≡1. Also, we found a positive continuous function l such that entire solutions of the homogeneous linear differential equation with arbitrary fast growth have a bounded l -index and estimated its growth.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2017, 16, 2; 17-28
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Short term prediction of stock index changes based on linear classification
Krótkoterminowe prognozowanie indeksów giełdowych w oparciu o klasyfikator liniowy
Autorzy:
Krawczuk, J.
Bobrowski, L.
Powiązania:
https://bibliotekanauki.pl/articles/404168.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Symulacji Komputerowej
Tematy:
prognozowanie krótkoterminowe
zmiany indeksu giełdowego
klasyfikator liniowy
short term prediction
stock index changes
linear classifier
Opis:
This article describe the linear classifier based on convex and piecewise-linear function (CPL) and it application to market prediction. In an experiment we use CPL linear classifier to predict direction of one day change in stock index price. We use classification approach to predict only direction of change (grow or decline) of the index, not it quantity as in regression approach. Total number of instruments used in experiment including currencies is 42. Prediction of one index is based on historical prices of all 42 indexes. Using 7 historical values for each index it produce 294 attributes. Such high dimensional feature space was reduced by feature selection method - relaxed linear separability (RLS). Details of this methodology are also presented. Features was selected and model was build on training data. Test data (holdout data) was used for checking model accuracy. Model in average correctly classify (predict) 51.9 per cent direction of daily index changes.
W artykule opisano klasyfikator liniowy oparty o wypukłe i odcinkowo-liniowe funkcje kary (CPL) i jego zastosowanie w prognozowaniu giełdy. W przeprowadzonym eksperymencie klasyfikator liniowy CPL został użyty do prognozy kierunku jednodniowej zmiany indeksów giełdowych. W zastosowanym podejściu klasyfikacyjnym prognozowano jedynie kierunek zmian (wzrost lub spadek), a nie dokładną wartość indeksu (podejście regresyjne). W eksperymencie użyto 42 instrumentów finansowych, w tym m.in. kursów walut. Jednodniowa prognoza wybranego instrumentu budowana jest w oparciu o wartości historyczne wszystkich 42 instrumentów. Używając 7 danych historycznych dla każdego instrumentu, uzyskano w sumie 294 atrybuty. Tak wielowymiarowa przestrzeń została zredukowana metodą selekcji cech opartą o relaksację liniowej separowalności. Metoda ta została opisana szczegółowo. Selekcja cech i budowa modelu w wybranej podprzestrzeni została przeprowadzona na zbiorze uczącym (treningowym). Natomiast ocena modelu została przeprowadzona na zbiorze testowym. Otrzymany wynik to średnio 51.9 procent prawidłowo sklasyfikowanych (prognozowanych) dziennych zmian indeksów giełdowych.
Źródło:
Symulacja w Badaniach i Rozwoju; 2010, 1, 4; 363-373
2081-6154
Pojawia się w:
Symulacja w Badaniach i Rozwoju
Dostawca treści:
Biblioteka Nauki
Artykuł

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