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    Wyświetlanie 1-58 z 58
    Tytuł:
    Some results on centered triangular sum graphs
    Autorzy:
    Baskar, M.
    Namasivayam, P.
    Syed Ali Nisaya, M. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193374.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Centered triangular numbers
    centered triangular sum graphs
    centered triangular sum labeling
    Opis:
    A centered triangular sum labeling of a graph G is a one-to-one function f : V (G) → N ∪{0} that induces a bijection f *: E(G) →{B_1 〖,B〗_2,…B_q} of the edges of G defined by f * (uv) = f(u) + f(v), for all e = uv ∊ E(G). The graph which admits such labeling is called a centered triangular sum graph.
    Źródło:
    World Scientific News; 2021, 155; 113-128
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Further results on centered triangular sum graphs
    Autorzy:
    Baskar, M.
    Namasivayam, P.
    Syed Ali Nisaya, M. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193390.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Centered triangular numbers
    centered triangular sum graphs
    centered triangular sum labeling
    Opis:
    Let G be a graph with p vertices and q edges. The nth centered triangular number is denoted by M_n, where M_n = 1/2 (3n2 - 3n + 2). A centered triangular sum labeling of a graph G is a one-to-one function : V (G) → N ∪{0} that induces a bijection f *: E(G) →{M_1 〖,M〗_2,…M_q} of the edges of G defined by f * (uv) = f(u) + f(v), for all e = uv ∊ E(G). The graph which admits such labeling is called a centered triangular sum graph. In this article, the centered triangular sum labeling of union of some graphs are studied.
    Źródło:
    World Scientific News; 2021, 156; 13-25
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some results on centered triangular graceful graphs
    Autorzy:
    Baskar, M.
    Namasivayam, P.
    Syed Ali Nisaya, M. P.
    Mahendran, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193414.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Centered triangular numbers
    centered triangular graceful graphs
    centered triangular graceful labeling
    Opis:
    Let G be a graph with p vertices and q edges. The nth centered triangular number is denoted by C_n, where C_n = 1/2 (3n2 - 3n + 2). A centered triangular graceful labeling of a graph G is a one-to-one function f : V (G) → {0,1,…C_q} that induces a bijection f *: E(G) →{C_1 〖,C〗_2,…C_q} of the edges of G defined by f * (e) = │f(u) - f(v)│, for all e = uv ∊ E(G). The graph which admits such labeling is called a centered triangular graceful graph.
    Źródło:
    World Scientific News; 2021, 156; 176-191
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Second order triangular graceful graphs
    Autorzy:
    Sakthi Sankari, R.
    Syed Ali Nisaya, M. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193377.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Second order triangular graceful graph
    Second order triangular graceful labeling
    Second order triangular number
    Opis:
    Let G=(V,E) be a graph with p vertices and q edges. A second order triangular graceful labeling of a graph G is an one to one function φ:V(G)→{0,1,2,…,B_q} where B_q is the qth second order triangular number, ie., B_q=1/6 q(q+1)(2q+1), that induces a bijection φ^*:E(G)→{B_1,B_2,…,B_q} of the edges of G defined by φ^* (uv) =|φ(u)-φ(v)| ∀ e=uv ∈E(G). A graph which admits such labeling is called a second order triangular graceful graph. In this paper, we introduce second order triangular graceful labeling and we prove that star, subdivision of star, nK_1,3, nK_2, bistar, path, comb, coconut tree, shrub and Y-tree are second order triangular graceful graphs.
    Źródło:
    World Scientific News; 2021, 155; 140-154
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Higher order triangular graceful labeling of some graphs
    Autorzy:
    Sakthi Sankari, R.
    Syed Ali Nisaya, M. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193398.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    fifth order
    fifth order triangular graceful graph
    fifth order triangular graceful labeling
    fifth order triangular numbers
    fourth order
    third order
    Opis:
    A (p, q) graph G is said to admit higher order triangular graceful labeling if its vertices can be labeled by the integers from 0 to qth higher order triangular numbers such that the induced edge labels obtained by the absolute difference of the labels of end vertices are the first q higher order triangular numbers. A graph G which admits higher order triangular graceful labeling is called a higher order triangular graceful graph. In this paper, third order, fourth order, fifth order triangular graceful labeling are introduced and third order, fourth order, fifth order triangular graceful labeling of star graph, subdivision of star, nK_2, path, comb, bistar, coconut tree, nK_1,3 are studied.
    Źródło:
    World Scientific News; 2021, 156; 40-61
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An EOQ inventory model for Gompertz deteriorating items with quadratic demand and constant holding cost in a fuzzy environment
    Autorzy:
    Senbagam, K.
    Kokilamani, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1066258.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Deteriorating items
    Gompertz distribution
    Inventory system
    Pascal triangular method
    Quadratic function
    Triangular fuzzy number
    Opis:
    In this paper we discussed an economic order quantity inventory model for deteriorating items with time-dependent demand rate. Here the demand is considered as a quadratic function of time and deteriorating items follow a Gompertz distribution deterioration. Stock out is not permitted and holding cost is constant. The deterioration cost, holding cost and the parameters α, β are assumed as a triangular fuzzy numbers. Our goal is to maximize the total profit of inventory optimization by using Pascal triangular method. A few numerical examples illustrate the implementation of the proposed model. Sensitivity analysis is the study of how to divide and allocate the uncertainty in the output of a mathematical model or system to different sources of input uncertainty.
    Źródło:
    World Scientific News; 2019, 130; 25-41
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A scheme for congruence semidistributivity
    Autorzy:
    Chajda, Ivan
    Horváth, Eszter
    Powiązania:
    https://bibliotekanauki.pl/articles/728970.pdf
    Data publikacji:
    2003
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    ∧ -semidistributivity
    generalized semidistribitive law
    triangular scheme
    Opis:
    A diagrammatic statement is developed for the generalized semidistributive law in case of single algebras assuming that their congruences are permutable. Without permutable congruences, a diagrammatic statement is developed for the ∧-semidistributive law.
    Źródło:
    Discussiones Mathematicae - General Algebra and Applications; 2003, 23, 1; 13-18
    1509-9415
    Pojawia się w:
    Discussiones Mathematicae - General Algebra and Applications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improving of Business Planning Using the Method of Fuzzy Numbers
    Autorzy:
    Kostetska, Iryna
    Powiązania:
    https://bibliotekanauki.pl/articles/465544.pdf
    Data publikacji:
    2016-09-15
    Wydawca:
    Akademia Leona Koźmińskiego w Warszawie
    Tematy:
    business planning
    triangular numbers
    fuzzy sets
    profit
    Opis:
    Purpose: Summarize the experience of using modern methods in the business plan with the application of economic and mathematical modeling. Methodology: Theoretical and methodological basis of the study is the basic principles of economic theory, agricultural economics and scientific research of leading home and foreign scholars on the theory of planning. Originality: This further justifies business planning processes in agriculture from the standpoint of raising economic protection of farmers. The methodology for assessing farm income for planned indicators through the application of fuzzy numbers method in business planning is improved.
    Źródło:
    Journal of Management and Business Administration. Central Europe; 2016, 3; 67-61
    2450-7814
    Pojawia się w:
    Journal of Management and Business Administration. Central Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Agency suspensions of a back idler on angular oscillations of a tractor with the triangular caterpillar contour
    Autorzy:
    Varfolomeyev, V.
    Pobedin, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/246051.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    triangular caterpillar contour
    suspension
    back idler
    modelling
    Opis:
    Main route of development of an agricultural tractor construction is raise of productivity of Caterpillar at the expense of increase in working speeds and tractors and tool width. Such direction of development demands simultaneous development of running systems and suspensions of caterpillars. The analysis of possibility of application of running system with triangular Caterpillar contour in farm tractors is in-process made. The mathematical model of the Caterpillar has been developed for research conducting realised in the environment of SIMULINK. Within the limits of conducting of the analysis of a construction of running system with triangular Caterpillar contour more effective construction of a suspension of a back idler in comparison with existing suspensions has been developed. On a designed construction of a suspension the patent is gained. The spent mathematical simulation of oscillations ofa case of a tractor with various arrangements of running systems and at tractor operation on the most widespread regimes has displayed efficiency as designed circuit design of a tractor with triangular contour, and a designed construction of a suspension of a back idler. Working out of a technique of optimisation of a suspension bracket of the developed running system as a whole under concrete conditions of operation is necessary.
    Źródło:
    Journal of KONES; 2009, 16, 1; 507-511
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Agency of the suspension of the back idler on transport vibration of the tractor with triangular caterpillar contour
    Autorzy:
    Pobedin, A.
    Varfolomeev, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/244487.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    triangular caterpillar contour
    suspension
    back idler
    modelling
    Opis:
    Recently leading producers of farm tractors even more often apply in running systems triangular caterpillar contour (TCC). In such running system one of the most problem knots is the back idler (BI) which is loaded by reaction from a caterpillar track and from weight of the casco having on this support. Thus the vertical component of reaction from a tension of a caterpillar track in addition loads with a tie-rod tangential force suspension bracket BI, thereby disturbing with a casco and reducing smoothness of a course of a tractor. Modelling and the analysis of dependence of affecting of vibration on a seat of the motor-man depending on applied type of a suspension bracket of a back idler are in-process executed. The analysis of parameters of smoothness of a course for the circuit design with triangular caterpillar contour and the offered suspension bracket of a back idler showed that in comparison with base configuration of a tractor of family VT On transport operations, at traffic on the soil road with the lifted tool, affectings on a seat of the operator decrease in 1,1-1,7 times in vertical and in 1.1-1.2 times in horizontal directions, at work with nominal loading, and also with Rkr=50 kN, on an eddish, provides minor alteration of smoothness of a course, the divergence of values of affecting on a seat of the operator, on the average, makes 12–19 %. In comparison with triangular caterpillar contour and "a classical" suspension bracket of a back idler, various displacement-yoke systems of a back idler, at work on transport operations, slightly influence a divergence of parameters of affecting on a seat of the operator which make 2.6 % and 4 % for vertical and horizontal affectings accordingly. At work with nominal loading on an eddish, affectings on a seat of the operator decrease in 1.7–2.7 times in vertical and in 1.4–1.8 times in horizontal directions and at work with draw-bar loading of Rkr=50 kN on an eddish, affectings on a seat of the operator decrease in 1.4–2.1 times in vertical and periodically increase on some speeds no more than by 30 % in a horizontal direction.
    Źródło:
    Journal of KONES; 2011, 18, 1; 447-452
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A method for solving a system of linear equations with a symmetric indefinite coefficient matrix
    Autorzy:
    Czochralska, Izabela
    Powiązania:
    https://bibliotekanauki.pl/articles/748583.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Matematyczne
    Tematy:
    Gaussian elimination, triangular and triangular-diagonal factorization of a matrix, numerically stable diagonalization of a symmetric indefinite matrix.
    Opis:
    The subject of this article is a numerically stable method for solving nonsingular Cramerian systems of linear equations, with a symmetric indefinite coefficient matrix. It consists in adapting the algorithm presented in [1] that can stably and effectively diagonalize any indefinite symmetric matrix. It is in fact some modification of the Gaussian symmetric elimination procedure.
    Źródło:
    Mathematica Applicanda; 2006, 34, 48/07
    1730-2668
    2299-4009
    Pojawia się w:
    Mathematica Applicanda
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elastic buckling of a triangular frame subject to in-plane tension
    Autorzy:
    Magnucki, K.
    Milecki, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/949273.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    triangular frame
    elastic buckling
    critical load
    mathematical model
    Opis:
    The paper is devoted to elastic buckling of a symmetrical triangular frame under tensile in-plane load. Three mathematical models of the triangular frame are formulated. The first model deals with the pre-buckling state, the second one with the in-plane buckling state, and the third one with the lateral buckling state of the frame. The FEM-numerical model of the frame is formulated and the critical loads are calculated. The comparison of the results obtained in the analytical and numerical-FEM analysis is presented in tables and graphs in figures.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2015, 53, 3; 581-591
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quasiperfect domination in triangular lattices
    Autorzy:
    Dejter, Italo
    Powiązania:
    https://bibliotekanauki.pl/articles/743129.pdf
    Data publikacji:
    2009
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    perfect dominating set
    quasiperfect dominating set
    triangular lattice
    Opis:
    A vertex subset S of a graph G is a perfect (resp. quasiperfect) dominating set in G if each vertex v of G∖S is adjacent to only one vertex ($d_v$ ∈ {1,2} vertices) of S. Perfect and quasiperfect dominating sets in the regular tessellation graph of Schläfli symbol {3,6} and in its toroidal quotients are investigated, yielding the classification of their perfect dominating sets and most of their quasiperfect dominating sets S with induced components of the form $K_ν$, where ν ∈ {1,2,3} depends only on S.
    Źródło:
    Discussiones Mathematicae Graph Theory; 2009, 29, 1; 179-198
    2083-5892
    Pojawia się w:
    Discussiones Mathematicae Graph Theory
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Spectral Characterization of the S-Clique Extension of the Triangular Graphs
    Autorzy:
    Tan, Ying-Ying
    Koolen, Jack H.
    Xia, Zheng-Jiang
    Powiązania:
    https://bibliotekanauki.pl/articles/31564711.pdf
    Data publikacji:
    2020-05-01
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    co-edge-regular graph
    triangular graph
    s-clique extension
    Opis:
    A regular graph is co-edge regular if there exists a constant µ such that any two distinct and non-adjacent vertices have exactly µ common neighbors. In this paper, we show that for integers s ≥ 2 and n large enough, any co-edge-regular graph which is cospectral with the s-clique extension of the triangular graph T (n) is exactly the s-clique extension of the triangular graph T (n).
    Źródło:
    Discussiones Mathematicae Graph Theory; 2020, 40, 2; 663-676
    2083-5892
    Pojawia się w:
    Discussiones Mathematicae Graph Theory
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Deviations from Triangular Arbitrage Parity in Foreign Exchange and Bitcoin Markets
    Autorzy:
    Reynolds, Julia
    Sögner, Leopold
    Wagner, Martin
    Powiązania:
    https://bibliotekanauki.pl/articles/2075371.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    triangular arbitrage parity
    foreign exchange markets
    cryptocurrencies
    cointegration
    monitoring
    Opis:
    This paper applies recently developed procedures to monitor and date so-called “financial market dislocations”, defined as periods in which substantial deviations from arbitrage parities take place. In particular, we use a cointegration perspective to focus on deviations from the triangular arbitrage parity for exchange rate triplets. Due to increasing attention on and importance of mispricing in the market for cryptocurrencies, we include the cryptocurrency Bitcoin in addition to fiat currencies in our analysis. We do not find evidence for substantial deviations from the triangular arbitrage parity when only traditional fiat currencies are considered, but document significant deviations from triangular arbitrage parities in the newer market for Bitcoin. We tentatively confirm the importance of our results for portfolio strategies by showing that a currency portfolio that trades based on our detected break-points outperforms a simple buy-and-hold strategy.
    Źródło:
    Central European Journal of Economic Modelling and Econometrics; 2021, 2; 105-146
    2080-0886
    2080-119X
    Pojawia się w:
    Central European Journal of Economic Modelling and Econometrics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectral resolutions for non-self-adjoint block convolution operators
    Autorzy:
    Zalot, Ewelina
    Powiązania:
    https://bibliotekanauki.pl/articles/2216178.pdf
    Data publikacji:
    2022
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    spectral operators
    chains
    triangular decomposition
    Laurent operators
    Jacobi matrices
    Opis:
    The paper concerns the spectral theory for a class of non-self-adjoint block convolution operators. We mainly discuss the spectral representations of such operators. It is considered the general case of operators defined on Banach spaces. The main results are applied to periodic Jacobi matrices.
    Źródło:
    Opuscula Mathematica; 2022, 42, 3; 459-487
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parallel Algorithms for Forward and Back Substitution in Linear Algebraic Equations of Finite Element Method
    Autorzy:
    Fialko, Sergiy
    Powiązania:
    https://bibliotekanauki.pl/articles/308616.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    finite element method
    multithreaded parallelization
    sparse symmetric matrices
    triangular solution
    Opis:
    This paper considers several algorithms for parallelizing the procedure of forward and back substitution for high-order symmetric sparse matrices on multi-core computers with shared memory. It compares the proposed approaches for various finite-element problems of structural mechanics which generate sparse matrices of different structures.
    Źródło:
    Journal of Telecommunications and Information Technology; 2019, 4; 20-29
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A compositional approach to two-stage Data Envelopment Analysis in intuitionistic fuzzy environment
    Autorzy:
    Javaherian, Nafiseh
    Hamzehee, Ali
    Tooranloo, Hossein Sayyadi
    Powiązania:
    https://bibliotekanauki.pl/articles/2099430.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    data envelopment analysis
    intuitionistic fuzzy
    two-stage DEA
    triangular numbers
    Opis:
    Classical methods of data envelopment analysis operate by measuring the efficiency of decision- -making units (DMUs) compared to similar units, without taking their internal structure into account. However, some DMUs consist of two stages, with the first stage producing an intermediate product, which is then consumed in the second stage to produce the final output. The efficiency of this type of DMU is often measured using two-stage network data envelopment analysis. In real world, most data are vague. Therefore, the inputs and outputs of systems with vagueness data create uncertainty challenges for DMUs. As a result, when uncertainty appears, intuitionistic fuzzy sets can show more information than classical fuzzy sets. This paper presents a model of two-stage Network Data Envelopment Analysis based on intuitionistic fuzzy data, which measures the efficiency of the first and second stages of each DMU, and the overall efficiency measures based on the stage efficiencies.
    Źródło:
    Operations Research and Decisions; 2021, 31, 1; 21--39
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    About special properties of the hidden structure of triangular numbers for immediate factorization
    Autorzy:
    Samojluk, Artur
    Powiązania:
    https://bibliotekanauki.pl/articles/2133934.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    factorization algorithm
    RSA
    cryptography
    numerical experiments
    triangular numbers
    number theory
    Opis:
    The factorization problem belongs to a group of problems important in the security of information systems and cryptography. The article describes a new number factorization algorithm designed based on numerical experiments. We present an extension of number factorization using triangular numbers features. The described algorithm can be used to increase the security of key generation for the RSA algorithm.
    Źródło:
    Technical Sciences / University of Warmia and Mazury in Olsztyn; 2022, 25(1); 35--57
    1505-4675
    2083-4527
    Pojawia się w:
    Technical Sciences / University of Warmia and Mazury in Olsztyn
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Endonasal Triangular Technique for nasal valve rhinoplasty: a ten year review
    Autorzy:
    Havea, Ngalufua'atonga
    Tang, Cheryl
    Rockey, Jason
    Lynch, Angelica
    Powiązania:
    https://bibliotekanauki.pl/articles/1398205.pdf
    Data publikacji:
    2018
    Wydawca:
    Index Copernicus International
    Tematy:
    Nasal
    Valve
    Rhinoplasty
    Alar
    Endonasal
    Triangular
    Technique
    Surgery
    Nose
    Obstruction
    Opis:
    Introduction: The nasal valve is the main regulator of airflow in the nose. Consequently, the collapse of the nasal valve has a significant impact on nasal obstruction and hence quality-of-life of patients. Several nasal valve rhinoplasty techniques are being used, from cartilage grafts to endonasal resection of the upper lateral cartilage. We describe a new endonasal approach to nasal valve rhinoplasty, the Triangular Technique, and assess its efficacy and complication rate over ten years. Materials and Methods: A retrospective study of patients who underwent nasal valve rhinoplasty at three regional hospitals from Jan 2004 to May 2014 was conducted. Subjective reports were used to assess the improvement of nasal obstruction. A total of 24 patients were included. Results: Three months postoperatively, 19 patients reported improvement in nasal obstruction. Four patients required revision surgery. Two of these 4 patients had substantial symptom resolution post revision surgery. Ten patients were followed up for more than 5 years (range: 5.8 to 10.3 years), 9 of who reported continued satisfaction and none or minimal nasal obstruction after nasal valve rhinoplasty compared to before surgery. There were no reported complications. Discussion: The Triangular Technique is a straightforward endonasal technique to address collapsed nasal valves with minimal associated co-morbidities.
    Źródło:
    Polish Journal of Otolaryngology; 2018, 72, 5; 45-50
    0030-6657
    2300-8423
    Pojawia się w:
    Polish Journal of Otolaryngology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Periodic orbits around the triangular points with prolate primaries
    Autorzy:
    Abd El Motelp, Nihad
    Radwan, Mohamed
    Powiązania:
    https://bibliotekanauki.pl/articles/2204240.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Centrum Badań Kosmicznych PAN
    Tematy:
    restricted three-body problem
    triangular points
    prolate triaxial
    periodic orbits
    Opis:
    Periodic orbits play a fundamental role in the study and deep understanding of the behavior of dynamical systems. In the current work, we investigated the periodic orbits around the triangular libration points of the restricted three-body problem. The equations of motion of the restricted problem are presented when both primaries are prolate triaxial. Periodic orbits around the triangular points are obtained and then illustrated graphically for some selected initial conditions and for the entire domain of the mass ratio µ, as well. The eccentricities of the periodic orbits are obtained and then represented graphically. It is observed that the periodic orbits about the triangular stationary points are elliptical, and the frequencies of short and long orbits of the periodic motion are influenced by the shape of the primary bodies. Furthermore, we found that the perturbing forces influence the period, the orientation, and the eccentricities of the short and long periodic orbits.
    Źródło:
    Artificial Satellites. Journal of Planetary Geodesy; 2023, 58, 1; 1--13
    2083-6104
    Pojawia się w:
    Artificial Satellites. Journal of Planetary Geodesy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Limit Conjecture on the Number of Hamiltonian Cycles on Thin Triangular Grid Cylinder Graphs
    Autorzy:
    Bodroža-Pantić, Olga
    Kwong, Harris
    Doroslovački, Rade
    Pantić, Milan
    Powiązania:
    https://bibliotekanauki.pl/articles/31342332.pdf
    Data publikacji:
    2018-05-01
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    contractible Hamiltonian cycles
    generating functions
    thin triangular grid cylinder graph
    Opis:
    We continue our research in the enumeration of Hamiltonian cycles (HCs) on thin cylinder grid graphs Cm × Pn+1 by studying a triangular variant of the problem. There are two types of HCs, distinguished by whether they wrap around the cylinder. Using two characterizations of these HCs, we prove that, for fixed m, the number of HCs of both types satisfy some linear recurrence relations. For small m, computational results reveal that the two numbers are asymptotically the same. We conjecture that this is true for all m ≥ 2.
    Źródło:
    Discussiones Mathematicae Graph Theory; 2018, 38, 2; 405-427
    2083-5892
    Pojawia się w:
    Discussiones Mathematicae Graph Theory
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dual-band multi slot patch antenna for wireless applications
    Autorzy:
    Samsuzzaman, M.
    Islam, M.T.
    Faruque, M. R. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/307982.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    Ku/K band
    microstrip patch antenna
    multiband
    satellite
    slotted
    triangular
    Opis:
    In this paper a novel configuration of broadband multi slot antenna for C/X bands is presented and analyzed. By cutting two diamond slots in the middle of the rectangular patch and three triangular slots in the right side of the patch, resonances can be created. Microstrip feed line is used in the down side region of the patch. Antenna characteristics were simulated using a finite element method (HFSS). According to simulations, the proposed multiple slot antennas can provide two separated impedance bandwidths of 970 MHz (about 11.96% centred at 8.11 GHz band) and 890 MHz (about 9.76% centred at 9.42 GHz band) and stable radiation patterns, promising for satellite systems.
    Źródło:
    Journal of Telecommunications and Information Technology; 2013, 2; 19-23
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of demand boosting policy on optimal inventory policy for imperfect lot size with backorder in fuzzy environment
    Autorzy:
    Yadav, D.
    Singh, S. R.
    Kumari, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/206244.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    learning curve
    advertisement
    signed distance
    triangular fuzzy number
    backorder
    inventory model
    Opis:
    This paper investigates an Economic Order Quantity (EOQ) model with backorder by taking imprecise demand rate with dependence upon the frequency of advertisement. The formulated model also incorporates learning effects on percentage of defective items present in each lot. Due to imprecision in demand, the obtained profit function is fuzzy. To determine the optimal values, we determine the equivalent crisp profit function by applying the signed distance method. Optimal order quantity and backorder level are obtained by using algebraic method in place of differential calculus. A numerical example is used to study the behavior of the model with respect to different inventory parameters. All calculations are performed with MATLAB 7.4.
    Źródło:
    Control and Cybernetics; 2012, 41, 1; 191-212
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Another six-node triangular element for structural analysis
    Autorzy:
    Ton-That, Hoang Lan
    Powiązania:
    https://bibliotekanauki.pl/articles/38887867.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    finite element method
    FEM
    double interpolation procedure
    six-node triangular element
    Opis:
    A six-node triangular element is presented in this paper for structural analysis. With this approach, the approximation functions of the interpolation strategy are given by using the double interpolation procedure, which includes nodal values as well as averaged nodal gradients. The numerical results are, therefore, achieved following the proposed element. The efficiency of this element and its comparison is described by some fundamental examples. Better numerical solutions and smoother distributions of stresses not achieved by the standard elements will be provided when using this element. The computational time is also presented to overview the pros and cons of the proposed element. In fact, the new element’s computational time is higher than that based on the standard element because of the double interpolation procedure, but one does not need post-processing of any smoothing operation.
    Źródło:
    Engineering Transactions; 2022, 70, 3; 221-238
    0867-888X
    Pojawia się w:
    Engineering Transactions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The natural convection inside a 3D triangular cross section cavity filled with nanofluid and included cylinder with different arrangements
    Autorzy:
    Ghoben, Zainab Kareem
    Hussein, Ahmed Kadhim
    Powiązania:
    https://bibliotekanauki.pl/articles/2096184.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    natural convection
    triangular cavity
    inner cylinder
    nanofluid
    3D
    konwekcja naturalna
    Opis:
    In this paper the laminar unsteady natural convection heat transfer of (Al2O3-water) nanofluid inside 3D triangular cross section cavity was investigated. The cavity was heated differentially, the vertical walls were kept at different constant temperatures. The left hot and the right cold. The effect of the solid volume fraction was examined for two values and compared with the pure water results. The (Ra) range studied was (103≤Ra≤106). Inserting cylindrical body inside the cavity also investigated in three cases. One concentric cylinder has radius (15%) of the cavity side length. The other cases were of two cylinders having radius (7.5%) of the cavity side length, aligned vertically or nonaligned. The results show that the higher solid volume fraction gives the maximum enhancement of the average (Nu) and this enhancement increases with (Ra) increase. For the cases with inner cylinders, the average (Nu) enhanced for the case of double cylinders over single cylinder. On other hand, the nonaligned position of the cylinders giving more enhancement than other position. As like as, the location of maximum horizontal or vertical velocities were varied with the cylinders position while (Ra) has no effect.
    Źródło:
    Diagnostyka; 2022, 23, 2; no. art. 2022205
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Topological entropy of nonautonomous piecewise monotone dynamical systems on the interval
    Autorzy:
    Kolyada, Sergiĭ
    Misiurewicz, Michał
    Snoha, L’ubomír
    Powiązania:
    https://bibliotekanauki.pl/articles/1205245.pdf
    Data publikacji:
    1999
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    nonautonomous dynamical system
    topological entropy
    triangular maps
    piecewise monotone maps
    $C^∞$ maps
    Opis:
    The topological entropy of a nonautonomous dynamical system given by a sequence of compact metric spaces $(X_i)^∞_{i = 1}$ and a sequence of continuous maps $(f_i)^∞_{i = 1}$, $f_i : X_i → X_{i+1}$, is defined. If all the spaces are compact real intervals and all the maps are piecewise monotone then, under some additional assumptions, a formula for the entropy of the system is obtained in terms of the number of pieces of monotonicity of $f_n ○... ○ f_2 ○ f_1$. As an application we construct a large class of smooth triangular maps of the square of type $2^∞$ and positive topological entropy.
    Źródło:
    Fundamenta Mathematicae; 1999, 160, 2; 161-181
    0016-2736
    Pojawia się w:
    Fundamenta Mathematicae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adults with HF-ASD in Loving Relationships – A Research Report
    Wysoko funkcjonujący dorośli z zaburzeniami ze spektrum autyzmu w związkach miłosnych – doniesienie z badań
    Autorzy:
    Kossewska, Joanna
    Bryniarska, Aneta
    Powiązania:
    https://bibliotekanauki.pl/articles/468060.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie
    Tematy:
    High Functioning Autism Spectrum Disorder
    adulthood
    loving relationship
    Triangular Theory of Love
    Opis:
    Adults with Autism Spectrum Disorder (ASD) experience a need for loving relationships, however they face problems in engagement and family functioning. The presented study was based of Sternberg’s Triangular Theory of Love. 38 adults with high functioning ASD [16 females (42%) and 22 males (58%)] aged 18 to 47, voluntarily and anonymously participated in the study. Two measures were used; the AQ (Autism Spectrum Quotient) and the Test of theTriangular Theory of Love. The results showed that among adults with HF-ASD, the intensity of love components is not correlated with autistic symptoms. On the basis of the presented findings, it might be concluded that the intensity of autistic features was not found as a variable affecting love components. The presented survey strives to fill the gap in this field of autism research. However, this preliminary outcome should be verified in wider research with more controlled variables.
    Dorośli zzaburzeniami ze spektrum autyzmu (ASD) odczuwają potrzebę tworzenia związków, lecz równocześnie doświadczają trudności w angażowaniu się w funkcjonowanie rodziny. Prezentowane w artykule badania, w których uczestniczyło 38 wysoko funkcjonującymdorosłych z ASD [16 kobiet (42%) i 22 mężczyzn (58%) wwieku od 18 do 47 lat, zostały osadzone na gruncie trójczynnikowej teorii miłości opracowanej przez Sternberga. W badaniach wykorzystane zostały dwa narzędzia: Test czynnika autyzmu (Autism SpectrumQuotient) iSkala miłości R. Sternberga. Uzyskane wyniki wskazują, że u wysoko funkcjo-nującym dorosłych zASD intensywność składników miłości nie pozostaje wzwiązku liniowym z objawami autystycznymi, co może sugerować istnienie bardziej złożonych zależnościpomiędzy nasileniem charakterystycznych dla autyzmu objawów, a czynnikami miłości. Prezentowane badania stanowiły próbę uzupełnienia brakujących danych wdziedzinie badań nad autyzmem, lecz ze względu na ich wstępny charakter uzyskane wyniki wymagają dalszej weryfikacji przy użyciu metod jakościowych oraz przy ścisłej kontroli zmiennych pośredniczących.
    Źródło:
    Annales Universitatis Paedagogicae Cracoviensis. Studia Psychologica; 2017, 10; 69-76
    2084-5596
    Pojawia się w:
    Annales Universitatis Paedagogicae Cracoviensis. Studia Psychologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Weak Hölder convergence of processes with application to the perturbed empirical process
    Autorzy:
    Hamadouche, Djamel
    Suquet, Charles
    Powiązania:
    https://bibliotekanauki.pl/articles/1338868.pdf
    Data publikacji:
    1999
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    triangular functions
    Schauder decomposition
    Hölder space
    tightness
    Brownian bridge
    perturbed empirical process
    Opis:
    We consider stochastic processes as random elements in some spaces of Hölder functions vanishing at infinity. The corresponding scale of spaces $C^{α,0}_0$ is shown to be isomorphic to some scale of Banach sequence spaces. This enables us to obtain some tightness criterion in these spaces. As an application, we prove the weak Hölder convergence of the convolution-smoothed empirical process of an i.i.d. sample $(X_1,...,X_n)$ under a natural assumption about the regularity of the marginal distribution function F of the sample. In particular, when F is Lipschitz, the best possible bound α<1/2 for the weak α-Hölder convergence of such processes is achieved.
    Źródło:
    Applicationes Mathematicae; 1999, 26, 1; 63-83
    1233-7234
    Pojawia się w:
    Applicationes Mathematicae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamical properties of a modified chaotic Colpitts oscillator with triangular wave non-linearity
    Autorzy:
    Suresh, Rasappan
    Sathish Kumar, Kumaravel
    Regan, Murugesan
    Niranjan Kumar, K. A.
    Narmada Devi, R.
    Obaid, Ahmed J.
    Powiązania:
    https://bibliotekanauki.pl/articles/27312004.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    chaos
    Colpitts oscillator
    Lyapunov exponent
    diffusion
    stability
    synchronization
    triangular wave non-linearity
    Opis:
    The purpose of this paper is to introduce a new chaotic oscillator. Although different chaotic systems have been formulated by earlier researchers, only a few chaotic systems exhibit chaotic behaviour. In this work, a new chaotic system with chaotic attractor is introduced for triangular wave non-linearity. It is worth noting that this striking phenomenon rarely occurs in respect of chaotic systems. The system proposed in this paper has been realized with numerical simulation. The results emanating from the numerical simulation indicate the feasibility of the proposed chaotic system. More over, chaos control, stability, diffusion and synchronization of such a system have been dealt with.
    Źródło:
    Archives of Control Sciences; 2023, 33, 1; 25--53
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    PZT Asymmetrical Shape Optimization in Active Vibration Reduction of Triangular Plates
    Autorzy:
    Brański, Adam
    Kuras, Romuald
    Powiązania:
    https://bibliotekanauki.pl/articles/31339818.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    triangular plate
    actuator (PZT)
    active vibration reduction
    vibration reduction coefficient
    effectiveness coefficient
    Opis:
    The article presents the new 2D asymmetrical PZT (a-PZT) and its effectiveness in the active reduction of triangular plate vibrations. The isosceles right triangular plate with simply supported edges was chosen as the research object. To determine the a-PZT asymmetry and its distribution on the plate, a maximum bending moment criterion for the beam was used. First of all, this criterion points out exact center location of the a-PZT. It was at the point, at which the plate bending moment has reached its maximum value. Next, at this point, it was assumed that the piezoelectric consists of active fibers located radially from the center. Each fiber acted on the plate as a separate actuator. Next, at each direction, the actuator asymmetry was found mathematically by minimizing the amplitude of the vibrations. By connecting the outer edges of individual fibers, the 2D a-PZT was obtained. It was quantitatively confirmed that the effectiveness of the new a-PZT was the best compared with the effectiveness of the standard square and the circular PZTs, adding the same exciting energy to the PZTs.
    Źródło:
    Archives of Acoustics; 2023, 48, 3; 425-432
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvement of interlaboratory evaluation method of olfactometry in Japan
    Autorzy:
    Higuchi, T.
    Shigeoka, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/204818.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    olfactometry
    interlaboratory evaluation
    odor index
    qualified odor measurement laboratory
    triangular odor bag method
    Opis:
    Odor measurement is a crucial element of odor management and regulation. In Japan, nationwide interlaboratory evaluation of olfactometry using a variety of test odorants started in 2002. In the interlaboratory tests, odor index, a sensory index of odor determined by the triangular odor bag method, is measured. In 2016, interlaboratory evaluation method of olfactometry was improved. Isoamyl acetate with a concentration of 50 ppm was used as a test odor, and a total of 128 olfactometry laboratories participated in the test. In this method, test results of 11 ‘excellent qualified laboratories’ designated by the Japan Association on Odor Environment (JAOE) were used to determine reference value and repeatability and reproducibility standard deviations of odor index. On the bases of these statistical values, measurement results of each laboratory were evaluated, including trueness and precision. Among 127 evaluated laboratories, 87 laboratories (68%) conformed to both trueness and precision criteria. In the case of ‘qualified odor measurement laboratories’ designated by the JAOE, 53 out of 68 laboratories (78%) conformed to both criteria. The qualified odor measurement laboratories registration system of the JAOE contributes to the improvement of the quality of olfactometry laboratories and the reliability of odor measurement in Japan.
    Źródło:
    Archives of Environmental Protection; 2018, 44, 2; 94-99
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Resource Tuned Optimal Random Network Coding for Single Hop Multicast future 5G Networks
    Autorzy:
    Dong, Dhawa Sang
    Pokhrel, Yagnya Murti
    Gachhadar, Anand
    Qamar, Faizan
    Amiri, Iraj Sadegh
    Maharjan, Ram Krishna
    Powiązania:
    https://bibliotekanauki.pl/articles/226605.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    coding coefficients
    computational complexity
    lower triangular matrix
    random network coding
    sparse coding
    coefficients
    Opis:
    Optimal random network coding is reduced complexity in computation of coding coefficients, computation of encoded packets and coefficients are such that minimal transmission bandwidth is enough to transmit coding coefficient to the destinations and decoding process can be carried out as soon as encoded packets are started being received at the destination and decoding process has lower computational complexity. But in traditional random network coding, decoding process is possible only after receiving all encoded packets at receiving nodes. Optimal random network coding also reduces the cost of computation. In this research work, coding coefficient matrix size is determined by the size of layers which defines the number of symbols or packets being involved in coding process. Coding coefficient matrix elements are defined such that it has minimal operations of addition and multiplication during coding and decoding process reducing computational complexity by introducing sparseness in coding coefficients and partial decoding is also possible with the given coding coefficient matrix with systematic sparseness in coding coefficients resulting lower triangular coding coefficients matrix. For the optimal utility of computational resources, depending upon the computational resources unoccupied such as memory available resources budget tuned windowing size is used to define the size of the coefficient matrix.
    Źródło:
    International Journal of Electronics and Telecommunications; 2019, 65, 3; 463-469
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Summary of the port shoreline resource evaluation based on triangular fuzzy analytic hierarchy process
    Autorzy:
    Jiang, L.
    Tao, T.
    Zhang, C.
    Jiang, H.
    Wang, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/259464.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    port shoreline evaluation
    triangular fuzzy AHP
    fuzzy comprehensive evaluation
    shoreline of Nanjing port
    Opis:
    Port shoreline resources are the basis of port and shipping development, and its assessment method has become one of the hot issues in port research. On the basis of constructing a reasonable index evaluation system, this paper constructs the fuzzy evaluation matrix based on the triangular fuzzy analytic hierarchy process and constructs the fuzzy evaluation matrix by using the fuzzy comprehensive evaluation method, and obtains the maximum membership degree of the port shoreline resources. Compared with the traditional port shoreline Resource evaluation methods, the new one got more advantages in objective and quantitative. Finally, Combined with the Nanjing section of the Yangtze River as a case for verification, the results show that the model can accurately solve the problem of resource evaluation of port shoreline.
    Źródło:
    Polish Maritime Research; 2017, S 3; 16-22
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling imperfect time intervals in a two-dimensional space
    Autorzy:
    Qiang, Y.
    Delafontaine, M.
    Asmussen, K.
    Stichelbaut, B.
    De Tre, G.
    De Maeyer, P.
    Van de Weghe, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/970193.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    rough set
    rough time interval
    fuzzy set
    fuzzy time interval
    Triangular Model
    temporal relation
    Opis:
    Every event has an extent in time, which is usually described by crisp time intervals. However, under some circumstances, temporal extents of events are imperfect, and therefore cannot be adequately modelled by crisp time intervals. Rough sets and fuzzy sets are two frequently used tools for representing imperfect temporal information. In this paper, we apply a two-dimensional representation of crisp time intervals, which is called the Triangular Model (TM), to investigate rough time intervals (RTIs) and fuzzy time intervals (FTIs). With this model, RTIs and FTIs, as well as their temporal relations, can be represented as graphics (i.e. discrete geometries or continuous fields) in a two-dimensional time space. Compared to the traditional linear representation of time intervals, we found that TM provides a more compact and clearer representation of imperfect time intervals and relations. Moreover, temporal queries of imperfect intervals can be graphically addressed in TM, which is closer to human intuition than mathematical expressions. As human minds are more efficient in perceiving and processing graphic representations than numerical representations, we believe TM can be applied as a valuable assistant tool for analysing and reasoning about imperfect time intervals.
    Źródło:
    Control and Cybernetics; 2010, 39, 4; 983-1010
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical investigation of channel geometry on the performance of a PEM fuel cell
    Autorzy:
    Khazaee, I.
    Mohammadiun, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/264366.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    ogniwo paliwowe
    modelowanie numeryczne
    wydajność
    PEM fuel cell
    rectangular
    triangular
    elliptical
    numerical modeling
    performance
    Opis:
    A complete three-dimensional and single phase model for proton exchange membrane (PEM) fuel cells was used to investigate the effect of using different channels geometry on the performances, current density and gas concentration. The proposed model was a full cell model, which includes all the parts of the PEM fuel cell, flow channels, gas diffusion electrodes, catalyst layers and the membrane. Coupled transport and electrochemical kinetics equations were solved in a single domain; therefore no interfacial boundary condition was required at the internal boundaries between cell components. This computational fluid dynamics code was employed as the direct problem solver, which was used to simulate the three-dimensional mass, momentum, energy and species transport phenomena as well as the electron- and proton-transfer process taking place in a PEMFC. The results showed that the predicted polarization curves by using this model were in good agreement with the experimental results and a high performance was observed by using circle geometry for the channels of anode and cathode sides. Also, the results showed that the performance of the fuel cell improved when a rectangular channel was used.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2013, 18, 1; 85-98
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficiency assessment of the use of Bloch-Schmigalla triangular method to improve the functioning of commercial industry enterprise
    Autorzy:
    Skotnicka-Zasadzień, Bożena
    Sowiński, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/1931598.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    Bloch-Schmigalla triangular method
    quality
    effectiveness
    enterprise
    metoda trójkątna Blocha-Schmigalli
    jakość
    efektywność
    przedsiębiorczość
    Opis:
    Purpose: In order to maintain the highest possible quality of services, more and more often the enterprises make use of proven optimization methods that allow them to maintain competitiveness on the market. One of these methods is spatial placement of workstations that influences the functioning of enterprises. There are many techniques of placing workstations, depending on the business activity run by the company. Design/methodology/approach: This article presents the use of Bloch-Schmigalla triangular method to improve the placement of office workstations in a commercial industry enterprise. The method used allowed to improve the functioning of the company by shortening the time for forwarding of all documents and information. Findings: The use of Bloch-Schmigalla triangular method allowed for quick placement of workstations, new placement of workstations. As a result, the workstations will not be as loaded and specific tasks will be performed faster. The time saved can be used to complete other tasks. Thanks to Bloch-Schmigalla triangular method, the distances between the workstations are equal. Before, the distances between several of the workstations were greater than in the case of other ones. Research limitations/implications: The major limitation of the paper is that it is based on one case of an. In the future, it will be necessary to conduct studies in more organizations so as to find out if the same result can be achieved. Originality/ value: The article concerned the use of the Bloch-Schmigalli method to improve the positioning of office spaces in a commercial industry company. Until now, this method has not been used to improve the quality of work in office positions.
    Źródło:
    Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2020, 142; 243-262
    1641-3466
    Pojawia się w:
    Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Triangular Core Rotation of a Hybrid Porous Core Terahertz Waveguide
    Autorzy:
    Ali, S.
    Ahmed, N.
    Alwee, S.
    Islam, M.
    Rana, S.
    Bhuiyan, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/227154.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    porous core waveguide
    THz waveguide
    flat EML
    hybrid design
    flat dispersion
    triangular design
    core rotation
    Opis:
    In this paper, we investigate the effects for rotating the triangular core air hole arrangements of a hybrid design porous core fiber. The triangular core has been rotated in anticlockwise direction to evaluate the impact on different waveguide properties. Effective Material Loss (EML), confinement loss, bending loss, dispersion characteristics and fraction of power flow are calculated to determine the impacts for rotating the triangular core. The porous fiber represented here has a hybrid design in the core area which includes circular rings with central triangular air hole arrangement. The cladding of the investigated fiber has a hexagonal array of air hole distribution. For optimum parameters the reported hybrid porous core fiber shows a flat EML of ±0.000416 cm⁻¹ from 1.5 to 5 terahertz (THz) range and a near zero dispersion of 0.4±0.042 ps/THz/cm from 1.25 to 5.0 THz. Negligible confinement and bending losses are reported for this new type of hybrid porous core design. With improved concept of air hole distribution and exceptional waveguide properties, the reported porous core fiber can be considered as a vital forwarding step in this field of research.
    Źródło:
    International Journal of Electronics and Telecommunications; 2017, 63, 1; 25-31
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal performance enhancement of the mixed convection between two parallel plates by using triangular ribs
    Autorzy:
    Jehhef, K. A.
    Badawy, F. A.
    Hussein, A. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1839881.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    badanie numeryczne
    konwekcja mieszana
    równanie Naviera-Stokesa
    numerical study
    mixed convection
    vertical channel
    triangular rib
    Opis:
    This paper aims to investigate the mixed convection between two parallel plates of a vertical channel, in the presence of a triangular rib. The non-stationary Navier-Stokes equations were solved numerically in a two-dimensional formulation for the low Reynolds number for the laminar air flow regime. Six triangular ribs heat-generating elements were located equidistantly on the heated wall. The ratio of the ribs to the channel width is varied (h / H = 0.1, 0.2, 0.3 and 0.4) to study the effect of ribs height effects, the ratio of the channel width to the ribs height is fixed constant at (H / w = 2) and the ratio of the channel height to the ribs pitch is fixed at (W/p=10). The influence of the Reynolds number that ranged from 68 to 340 and the Grashof number that ranged from 6.6 ×103 to 2.6 ×104 as well as the Richardson number chosen (1.4, 0.7, 0.4 and 0.2) is studied. The numerical results are summarized and presented as the profile of the Nusselt number, the coefficient of friction, and the thermal enhancement factor. The contribution of forced and free convection to the total heat transfer is analyzed. Similar and distinctive features of the behavior of the local and averaged heat transfer with the variation of thermal gas dynamic and geometric parameters are investigated in this paper. The results showed that the Nusselt number and friction factor increased by using the attached triangular ribs, especially when using the downstream ribs. Also, the results revealed that the Nusselt number increased by increasing the ratio of the ribs to the channel width.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2021, 26, 2; 11-30
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A novel approach to photonic generation of periodic triangular radio frequency waveforms
    Autorzy:
    Xiang, P.
    Guo, H.
    Chen, D.
    Zhu, H.
    Wu, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/174643.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    microwave photonics
    triangular waveform
    polarization modulator (PolM)
    microwave photonic filter (MPF)
    radio frequency (RF) waveform generation
    Opis:
    A novel approach to photonic generation of triangular radio frequency waveforms with a tunable repetition rate is proposed and analyzed. In the proposed system, a continuous-wave light is modulated by a reference microwave signal through a polarization modulator, and then its output optical sidebands are manipulated by a microwave photonic filter with a negative tap. By properly adjusting the system parameters, full-duty-cycle triangular radio frequency waveforms can be generated after optical-to-electrical conversion, and its repetition rate (frequency) can be tuned in a wide range. A model describing the proposed system is derived, which is verified via computer simulations.
    Źródło:
    Optica Applicata; 2015, 45, 3; 381-391
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Trójkąt Osanna jako forma prezentacji danych statystycznych i legenda map tematycznych
    Osanna Triangle as a form of presentation and legend of thematic maps
    Autorzy:
    Korycka-Skorupa, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/204131.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Geograficzne
    Tematy:
    wykres trójkątny
    trójkąt Osanna
    mapa tematyczna
    kartogram strukturalny
    struktura zbiorowości
    typologia
    triangular diagram
    Osanna triangle
    choropleth presentation
    Opis:
    W artykule przedstawiono różne możliwości zastosowania w kartografii trójkąta Osanna, zwanego również wykresem trójkątnym. Po krótkim zarysowaniu historii tego sposobu prezentacji, szczegółowo omówiono jego właściwości oraz zasady konstrukcji. Pokazano różne sposoby czytania i interpretacji trójkąta, a także kartograficzne przykłady jego zastosowania.
    Osanna Triangle, also known as a triangular diagram, is a specific method of data presentation, used in statistics and socio-economic cartography to present phenomena of three-fold structure. This type of diagram presents which part of the whole is composed by particular elements, what the proportion of those elements is and how similar elements in two or more various entities compare. It is used as an independent presentation form as well as a legend of thematic maps. The term 'Osanna Triangle' comes from a name of a German mineralogist, Alfred Karl Osanna (1859-1923), who analyzed minerals according to their atomic and particle contents. The chemical classification of rocks, which he prepared, was presented on triangular diagrams. Osanna Triagle is a diagram of relations of three variables placed in a system of three coordinates. The location of each point within the triangle is determined by three coordinates, read at its sides, on heights led from its angles or on lines of the grid (fig. 2). Proper interpretation of the diagram bases on the understanding of significance of points' placement within the triangle. Often the triangle is divided into smaller units (triangles, rectangles) in order to establish areas where points with similar features occur (fig. 4). This diagram can be used to present the structure of a given statistical set and also conclusions about the whole set (fig. 5). Also, it can show the dynamics of a phenomenon through changing value of particular elements of the structure in time (fig. 6). Osanna Triangle is frequently used as an explanation, map legend, most often related to a choropleth presentation. Basing on a triangular diagram one can conclude about the distribution of phenomenon's value and determine choropleth classes. Application of an unorthodox triangular set of coordinates, to which we are not used, makes the perception of Osanna Triangle rather difficult. Perhaps this is why this method of data presentation is not commonly used.
    Źródło:
    Polski Przegląd Kartograficzny; 2007, T. 39, nr 4, 4; 340-353
    0324-8321
    Pojawia się w:
    Polski Przegląd Kartograficzny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of an EPQ model in an imprecise environment with defuzzification by the centroid method under inflation
    Autorzy:
    Arora, Ritu
    Chauhan, Anand
    Sharma, Renu
    Singh, Anubhav Pratap
    Powiązania:
    https://bibliotekanauki.pl/articles/2175846.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    fuzzy production inventory model
    selling price dependent demand
    inflation
    triangular fuzzy number
    trapezoidal fuzzy number
    centroid method
    Opis:
    The awareness of making decisions in an imprecise environment has resulted in considering the inventory system under a fuzzy approach. The effects of uncertain demand have been finding increased application in many inventory systems. Uncertainty creates complicated situations for the manufacturer in making decisions. Markets have become more competitive as a result of technological advancements. The effect of inflation on the overall cost of the inventory system is useful in providing a tool for the analysis of inventory decisions. This study intended to estimate the effect of different fuzzy numbers on a manufacturer's annual joint expected total cost. The comparative study of this proposed model has been considered for two different fuzzy numbers with the defuzzification technique as the centroid method. The optimization technique has been used to minimize the producer’s joint expected total cost under the condition mentioned earlier, and the model is validated numerically.
    Źródło:
    Operations Research and Decisions; 2022, 32, 3; 32--48
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Genuinely multi-dimensional non-dissipative finite-volume schemes for transport
    Autorzy:
    Després, B.
    Lagoutiere, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/929681.pdf
    Data publikacji:
    2007
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    transport wielowymiarowy
    schemat objętości skończonych
    siatka trójkątów
    multidimensional transport
    finite-volume schemes
    anti-dissipative schemes
    triangular grids
    Opis:
    We develop a new multidimensional finite-volume algorithm for transport equations. This algorithm is both stable and non-dissipative. It is based on a reconstruction of the discrete solution inside each cell at every time step. The proposed reconstruction, which is genuinely multidimensional, allows recovering sharp profiles in both the direction of the transport velocity and the transverse direction. It constitutes an extension of the one-dimensional reconstructions analyzed in (Lagoutiere, 2005; Lagoutiere, 2006).
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2007, 17, 3; 321-328
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On Edge H-Irregularity Strengths of Some Graphs
    Autorzy:
    Naeem, Muhammad
    Siddiqui, Muhammad Kamran
    Bača, Martin
    Semaničová-Feňovčíková, Andrea
    Ashraf, Faraha
    Powiązania:
    https://bibliotekanauki.pl/articles/32225869.pdf
    Data publikacji:
    2021-11-01
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    prism
    antiprism
    triangular ladder
    diagonal ladder
    wheel
    gear graph
    H-irregular edge labeling
    edge H-irregularity strength
    Opis:
    For a graph G an edge-covering of G is a family of subgraphs H1, H2, . . ., Ht such that each edge of E(G) belongs to at least one of the subgraphs Hi, i = 1, 2, . . ., t. In this case we say that G admits an (H1, H2, . . ., Ht)-(edge) covering. An H-covering of graph G is an (H1, H2, . . ., Ht)-(edge) covering in which every subgraph Hi is isomorphic to a given graph H. Let G be a graph admitting H-covering. An edge k-labeling α : E(G) → {1, 2, . . ., k} is called an H-irregular edge k-labeling of the graph G if for every two different subgraphs H′ and H′′ isomorphic to H their weights wtα(H′) and wtα(H′″) are distinct. The weight of a subgraph H under an edge k-labeling is the sum of labels of edges belonging to H. The edge H-irregularity strength of a graph G, denoted by ehs(G, H), is the smallest integer k such that G has an H-irregular edge k-labeling. In this paper we determine the exact values of ehs(G, H) for prisms, antiprisms, triangular ladders, diagonal ladders, wheels and gear graphs. Moreover the subgraph H is isomorphic to only C4, C3 and K4.
    Źródło:
    Discussiones Mathematicae Graph Theory; 2021, 41, 4; 949-961
    2083-5892
    Pojawia się w:
    Discussiones Mathematicae Graph Theory
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena wyrobów typu islandzkiego w kontekście jakości żywności®
    Assessment of Iceland products in the context of nutritional quality®
    Autorzy:
    Żuchowski, Jerzy
    Kiraga, Aneta
    Kowalska, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/227481.pdf
    Data publikacji:
    2019
    Wydawca:
    Wyższa Szkoła Menedżerska w Warszawie
    Tematy:
    wyrób typu islandzkiego
    jakość żywieniowa
    metoda trójkątowa
    metoda skalowania
    Icelandic type product
    nutritional quality
    triangular method
    scaling method
    Opis:
    W artykule zaprezentowano informacje dotyczące wyrobów typu islandzkiego określanych jako skyr, które stanowią jedną z innowacji w segmencie produktów mlecznych na polskim rynku. Celem pracy była analiza preferencji konsumenckich dotyczących wybranych wyrobów typu islandzkiego z wsadem owocowym oraz próba oceny, czy wyroby tego typu są akceptowane przez konsumentów. Dokonano szczegółowej analizy składu wybranych do badań produktów, pochodzących od trzech różnych producentów. Wykazano różnice między nimi wykorzystując metodę trójkątową oraz zbadano preferencje konsumentów stosując metodę skalowania. Wyniki badań wskazały, że badane produkty różniły się między sobą istotnie, pomimo iż należały do wyrobów tego samego typu. Były one atrakcyjne dla konsumentów pod względem sensorycznym i mogą stanowić wartościowy składnik diety, głównie z uwagi na zawartość białka, witamin oraz minerałów.
    In this work the information regarding Icelandic type products known as skyr, which are one of the innovations in the dairy products segment on the Polish market was presented. The aim of the study was to analyze consumer preferences regarding selected Icelandic type products with fruit input and to try to assess whether products of this type are accepted by consumers. A detailed analysis of the composition of products selected for testing from three different manufacturers was performed. Differences between them were shown using the triangle method and consumer preferences were tested using the scaling method. The results of own research indicate that the tested products may differ significantly, even though they belong to products of the same type. These products are attractive to consumers in sensory terms and can be a valuable component of the diet, mainly due to the content of protein, vitamins and minerals.
    Źródło:
    Postępy Techniki Przetwórstwa Spożywczego; 2019, 2; 17-25
    0867-793X
    2719-3691
    Pojawia się w:
    Postępy Techniki Przetwórstwa Spożywczego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quasi-optimal PZT distribution in active vibration reduction of the triangular plate with P-F-F boundary conditions
    Autorzy:
    Brański, A.
    Szela, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/229810.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    triangular plate
    PZT (piezoelectric zirconate titanate) actuator
    P-F-F (partial-free-free) boundary condition
    active vibration reduction
    Opis:
    An active reduction of transverse vibration of the triangular plate with P-F-F boundary conditions is considered. The cracked plate is idealized research model as partially clamped on one edge with varying clamped length. The active reduction is realised with PZTs. In the paper, assuming the detached base clamped length, the influence of PZTs distribution on the bending moment and the shearing force at the clamped edge is investigated. To realize the purpose two cases are considered. At the former the PZTs are attached at points in which the curvatures of the surface locally take their maximum (MC sub-areas or quasi-optimal ones). At the latter, the PZTs are somewhat shifted. The plate is excited with harmonic plane acoustic wave. The second mode is considered only. The active vibration reduction study with a finite element method (FEM) is carried out. The numerical calculations show that better results are obtained for MC distribution of the PZTs.
    Źródło:
    Archives of Control Sciences; 2010, 20, 2; 209-226
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Triangular fuzzy-rough set based fuzzification of fuzzy rule-based systems
    Autorzy:
    Starczewski, Janusz T.
    Goetzen, Piotr
    Napoli, Christian
    Powiązania:
    https://bibliotekanauki.pl/articles/1837416.pdf
    Data publikacji:
    2020
    Wydawca:
    Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
    Tematy:
    general type-2 fuzzy logic systems
    fuzzy-rough fuzzification
    regular type-2 t-norms
    cropped triangular secondary membership functions
    Opis:
    In real-world approximation problems, precise input data are economically expensive. Therefore, fuzzy methods devoted to uncertain data are in the focus of current research. Consequently, a method based on fuzzy-rough sets for fuzzification of inputs in a rulebased fuzzy system is discussed in this paper. A triangular membership function is applied to describe the nature of imprecision in data. Firstly, triangular fuzzy partitions are introduced to approximate common antecedent fuzzy rule sets. As a consequence of the proposed method, we obtain a structure of a general (non-interval) type-2 fuzzy logic system in which secondary membership functions are cropped triangular. Then, the possibility of applying so-called regular triangular norms is discussed. Finally, an experimental system constructed on precise data, which is then transformed and verified for uncertain data, is provided to demonstrate its basic properties.
    Źródło:
    Journal of Artificial Intelligence and Soft Computing Research; 2020, 10, 4; 271-285
    2083-2567
    2449-6499
    Pojawia się w:
    Journal of Artificial Intelligence and Soft Computing Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Himmelsbeobachtungen und deren Messung, von der Regierungszeit des Gudea von Lagash bis zum Almagest des Claudius Ptolemäus
    Celestial observations and their measurement, from the reign of Gudea of Lagash to the Almagest of Claudius Ptolemaeus
    Autorzy:
    Kleb, Jens
    Powiązania:
    https://bibliotekanauki.pl/articles/36169694.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
    Tematy:
    Units of Length
    Ptolemaeus
    Chaldeans
    angular measurement
    old Babylonian diagonal calculation
    table of chords
    triangular calculation
    apparent diameter Moon
    Opis:
    The present article gives an overview on the development of the measurement and practical acquisition of circle section dimensions since the late 3rd millennium BC. In key points, the prerequisites and practical implementation for celestial observations over approx. 1500 years up to the 8th century BC are collected and analyzed, in terms of their logical requirements and connected archaeological findings. A comprehensible and unambiguous calculation is made for the celestial dimensions in cubits used from the 8th to the 2nd century BC, for which estimated values between 2.5 and 2.1 angular degrees have been determined since Kugler 1900 until to recently researchers. Therefore, for the first time, the exact transformation value is presented here. Not only the connections and the further development of this celestial measurement system are presented, but also its coherent adaptation up to the first definition and use of the angular unit measurement, which is still used today, around 200 BC. In addition, some data and their previous interpretation from various sources are put up for discussion, which even include the table of Chords, presented by Ptolemy in his Almagest and their use.
    Źródło:
    Historia i Świat; 2023, 12; 209-236
    2299-2464
    2956-6436
    Pojawia się w:
    Historia i Świat
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluating organizational antifragility via fuzzy logic : the case of an Iranian company producing banknotes and security paper
    Autorzy:
    Ghasemi, A.
    Alizadeh, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/969063.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    antifragility
    X-events
    triangular fuzzy number
    entropy technique
    linguistic term
    Euclidean distance
    liczba rozmyta trójkątna
    entropia
    termin lingwistyczny
    odległość euklidesowa
    Opis:
    The concept of antifragility has received much attention from researchers in recent years. Contrary to fragile systems which fail when exposed to stressors, antifragile systems prosper and improve in response to unpredictability, volatility, randomness, chaos and disturbance. The implications of antifragility goes beyond resilience or robustness. A resilient system resists stress and remains the same; while an antifragile system improves. Taleb argues that antifragility is required for dealing with events that he called black swans or X-events, which are scarce, unpredictable, and extreme events. Such events come as a surprise and have major consequences. The concept of antifragility was developed by Taleb in a socioeconomic context, not in industrial production. However, the authors think that this concept may have its greatest practical utilization when applied to industrial environments. Thus, they focused on this concept in the article aiming to investigate the level of antifragility in an organization. In order to perform this, the authors used a case study based on an Iranian manufacturer of banknotes and security paper (TAKAB). Firstly, a questionnaire was designed based on 7 criteria related to antifragility using the five-point Likert scale and a triangular fuzzy number for each linguistic term is defined. In the next phase, the weight of each component was obtained using the entropy technique. In the final stage, the Euclidean distance between the aggregated fuzzy antifragility index (FAI) and each linguistic term used during this case study was calculated. Finally, based on these results, the level of the organization’s antifragility was assessed as satisfactorily antifragile, based on the minimum Euclidean distance.
    Źródło:
    Operations Research and Decisions; 2017, 27, 2; 21-43
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heating control of a finite rod with a mobile source
    Autorzy:
    Jilavyan, Samvel H.
    Grigoryan, Edmon R.
    Khurshudyan, Asatur Zh.
    Powiązania:
    https://bibliotekanauki.pl/articles/1409386.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    null-controllability
    mobile control
    nonlinear constraints
    triangular wave
    rectangular wave
    Green’s function approach
    heuristic control
    lack of exact controllability
    Opis:
    The Green’s function approach is applied for studying the exact and approximate null-controllability of a finite rod in finite time by means of a source moving along the rod with controllable trajectory. The intensity of the source remains constant. Applying the recently developed Green’s function approach, the analysis of the exact null-controllability is reduced to an infinite system of nonlinear constraints with respect to the control function. A sufficient condition for the approximate null-controllability of the rod is obtained. Since the exact solution of the system of constraints is a long-standing open problem, some heuristic solutions are used instead. The efficiency of these solutions is shown on particular cases of approximate controllability.
    Źródło:
    Archives of Control Sciences; 2021, 31, 2; 417-430
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of two dimensional photonic band gaps
    Autorzy:
    Dissanayake, S. E.
    Wijewardena Gamalath, K. A. I. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/411904.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Photonic crystal
    square lattice
    triangular lattice
    honeycomb lattice
    plane wave expansion
    mode field distribution
    GaAs
    dielectric kontrast
    filling fraction
    gap maps
    Opis:
    The plane wave expansion method was implemented in modelling and simulating the band structures of two dimensional photonic crystals with square, triangular and honeycomb lattices with circular, square and hexagonal dielectric rods and air holes. Complete band gaps were obtained for square lattice of square GaAs rods and honeycomb lattice of circular and hexagonal GaAs rods as well as triangular lattice of circular and hexagonal air holes in GaAs whereas square lattice of square or circular air holes in a dielectric medium ε = 18 gave complete band gaps. The variation of these band gaps with dielectric contrast and filling factor gave the largest gaps for all configurations for a filling fraction around 0.1.The gap maps presented indicated that TM gaps are more favoured by dielectric rods while TE gaps are favoured by air holes. The geometrical gap maps operating at telecommunication wavelength λ = 1.55 m showed that a complete band gap can be achieved for triangular lattice with circular and hexagonal air holes in GaAs and for honeycomb lattice of circular GaAs rods.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 5; 58-88
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the numerical approximation of first-order Hamilton-Jacobi equations
    Autorzy:
    Abgrall, R.
    Perrier, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/929712.pdf
    Data publikacji:
    2007
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    równanie Hamiltona-Jacobiego
    aproksymacja
    zagadnienie Cauchy'ego-Dirichleta
    siatka trójkątna
    approximation of Hamilton-Jacobi equations
    viscous solution
    Cauchy-Dirichlet problem
    triangular mesh
    Opis:
    Some methods for the numerical approximation of time-dependent and steady first-order Hamilton-Jacobi equations are reviewed. Most of the discussion focuses on conformal triangular-type meshes, but we show how to extend this to the most general meshes. We review some first-order monotone schemes and also high-order ones specially dedicated to steady problems.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2007, 17, 3; 403-412
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Середньовічні щити Європи та Русі (конструкція, військово-символічне значення, розвиток)
    Medieval Shields of Europe and Rus’ (Construction, Military Symbolic Significance, Development)
    Autorzy:
    Козак, М.І.
    Powiązania:
    https://bibliotekanauki.pl/articles/22676837.pdf
    Data publikacji:
    2022-11-08
    Wydawca:
    National Academy of Sciences of Ukraine. Institute of World History
    Tematy:
    комплекс озброєння
    обладунок
    мигдалеподібний щит
    трикутний щит
    павеза
    тарч
    «черлені щити»
    armament complex
    armor
    almond-shaped shield
    triangular shield
    pavise
    tarch
    “cherleni shchyty”
    Opis:
    У статті розглянуто проблему розвитку щитів як головного елементу середньовічного захисного спорядження та важливого військового і геральдичного символу в українській середньовічній державі Русь та в Європі загалом. Автором окреслено стан дослідження теми та її джерельну базу. Простежено головні тенденції розвитку конструкції та символічного значення щитів у Європі періоду середньовіччя. Водночас, здійснено акцент на джерела, що стосуються Русі та суміжних із нею територій. Автор звертає увагу на необхідність зіставлення археологічних, писемних та іконографічних джерел у межах одного дослідження. У контексті цього дослідження звернено увагу на найбільш репрезентативні джерела, особливо на ті, які можна апробувати щодо руського матеріалу. Наголошено на тому, що щит як базовий елемент захисного спорядження впродовж середньовіччя чималим чином розвивався у руслі загальноєвропейських тенденцій. Це, водночас, унеможливлює виокремлення місцевих особливостей десь до початку ХІІІ ст. Саме на зламі ХІІ–ХІІІ ст. в деяких регіонах Східної Європи, а саме у русько-балтійсько-польському пограниччі формувався відносно новий тип щита, так звана «протопавеза». Це, відтак, мало безпосередній вплив на озброєння Русі і Тевтонського ордену у ХІІІ–XIV ст. У статті проаналізовано головні взаємовпливи і запозичення типів щитів поміж різними регіонами Східної Європи за доби середньовіччя. Наголошується, що на теренах української середньовічної держави Русь, яка перебувала на перетині східних та західних воєнних традицій, могли використовуватись щити як загальноєвропейських типів, так і східний «калкан». Проте, з огляду на наявні джерела, можна з упевненістю констатувати саме загальноєвропейську тенденцію розвитку цього захисного спорядження. Автор дійшов висновку, що щити, які використовувались як на Русі, так і в Європі у Х–ХІІ ст. загалом належали до тих самих типів. Зокрема, це круглий, мигдалеподібний та трикутний щити. Складнішим залишається питання щодо щитів ХІІІ–XV ст. У цей період можна спостерігати як впливи Західної Європи на Русь, наприклад, поширення рицарської тарчі, так і тенденції, які розпочались із теренів Східної Європи, а саме поширення павези у XІV–XV ст.
    The article considers the problem of the development of shields, the main element of medieval protective equipment, and an important military and heraldic symbol in Ukrainian medieval state of Rus’ and in Europe in general. The state of the research and the source base are outlined. The main trends in the development of the design and symbolic significance of shields in Europe during the Middle Ages are outlined. At the same time, emphasis was placed on sources concerning Rus’ lands and adjacent territories. The author draws attention to the need to compare archaeological, written and iconographic sources in one study. The study focuses on the most representative sources, especially those that can be to apply on material from the Rus’ lands. It is emphasized that the shield as a basic element of protective equipment during the Middle Ages, іn Rus’ lands largely developed in line with European trends. Which in turn makes it impossible to isolate local features about to beginning of the ХІІІ century. At the turn of the XII–XIII centuries in some regions of Eastern Europe, namely the Rus’-Baltic-Polish border, a relatively new type of shield is being formed, the so-called “protopaveza”. This in turn had a direct impact on the armaments of Rus’ and the Teutonic Order in the ХІІІ–ХІV centuries. The author analyzes the main interactions and borrowings of types of shields between different regions of Eastern Europe during the Middle Ages. It is noted that in the Ukrainian medieval state of Rus’, which was at the intersection of Eastern and Western military traditions, shields of both European types and the eastern “kalkan” could be used. However, given the available sources, it is safe to say that the European trend of development of this protective equipment had an advantage. The author came to the conclusion that the shields used in Rus’ and Europe in the X–XII centuries generally belonged to the same types. In particular, it is round, almond-shaped and triangular shields. The issue of shields of the XIII–XV centuries remains more complicated. During this period can be observed as the influence of Western Europe on Rus’, for example, the spread of the knight's “tarch”. And trends that began in Eastern Europe, namely the spread of pavises in the XIV–XV centuries.
    Źródło:
    Проблеми всесвітньої історії; 2022, 18; 12-40
    2707-6776
    Pojawia się w:
    Проблеми всесвітньої історії
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identyfikacja specyfik statystyki publicznej z zastosowaniem zmodyfikowanej ważonej rozmytej metody delfickiej
    The use of modified and waged delphi fuzzy method in process of identification characteristics of official statistics
    Autorzy:
    Mazur, Z.
    Pec, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/322612.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    zbiory rozmyte
    zmodyfikowana metoda delficka
    specyfika statystyki publicznej
    sztuczna inteligencja
    rozmyte liczby trójkątne
    fuzzy sets
    modified Delphi method
    characteristics of public statistics
    artificial intelligence
    triangular fuzzy numbers
    Opis:
    W artykule wykorzystano zmodyfikowaną ważoną rozmytą metodę delficką, używaną w zastosowaniach informatyki w obszarze sztucznej inteligencji, do rozwiązania problemu statystyki publicznej. Analiza technik stosowanych w Artificial Intelligence wskazuje na możliwość implementacji reprezentacji wiedzy za pomocą teorii zbiorów rozmytych, łącznie z rozmytymi technikami wnioskowania (logika rozmyta) w obszarze identyfikacji specyfik statystyki publicznej. Metoda ta, biorąc pod uwagę realia pracy statystyki publicznej, wydaje się przydatna przy identyfikacji jej specyfik, z którymi mogą się zmagać urzędy statystyczne lub jej pozostałe komórki organizacyjne. Szerzej problemy te opisano w artykułach [5] i [6]. Autorzy niniejszego opracowania zmodyfikowali znaną z literatury ważoną rozmytą metodę delficką do identyfikacji specyfik statystyki publicznej przedstawiając jej działanie na przykładzie.
    The article discusses, the concept of the use of a modified by authors of the well-known heuristic methods of decision making called Delphi method to help solve two basic issues; the identification characteristics of public statistics and objectivity of assessments. In order to obtain objectivity of expert assessments it was proposed by authors appropriate construction of the standardization of weights in weighted method, which takes into account the degree of convergence of the inference rules expert’s group. Identification of characteristics of public statistics can be a difficult even for specialists of statistics. Specialist dealing with various areas of official statistics usually not overwhelms the whole functioning of your organization, and what’s more important any organization may not fully understand the processes inside and discern the effects of such activities (e.g. informal processes-hidden or unconscious). By the way, it is in a certain sense natural and understandable, especially in the absence of the information model. Presented here modified weighted fuzzy inference technique including a new algorithm to assign standardized weights experts can greatly facilitate decision-making not only related to statistics, but also to other related tools – more or less used in an area of artificial intelligence.
    Źródło:
    Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2017, 113; 285-303
    1641-3466
    Pojawia się w:
    Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two-storage inventory model for deteriorating items with price dependent demand and shortages under partial backlogged in fuzzy approach
    Dwumagazynowy rozmyty model zapasów psujących się o zapotrzebowaniu zależnym od ceny oraz uwzględniający braki
    Autorzy:
    Indrajitsingha, Susanta Kumar
    Samanta, Padmanava
    Raju, Lakshmi Kanta
    Misra, Umakanta
    Powiązania:
    https://bibliotekanauki.pl/articles/362134.pdf
    Data publikacji:
    2019
    Wydawca:
    Wyższa Szkoła Logistyki
    Tematy:
    inventory
    two-warehouse system
    deterioration
    shortages
    triangular fuzzy number
    Graded Mean Integration Representation Method
    zapas
    system dwwumagazynowy
    zepsucie
    braki
    trójkątna liczba rozmyta
    metoda Graded Mean Integration Representation
    Opis:
    Background: In this paper we developed a fuzzy two-warehouse (one is OW, the own warehouse and other is RW, the rented warehouse) inventory model of deteriorating items with price dependent demand rate and allowed shortages under partially backlogged conditions. Since the capacity of any warehouse is limited, the supplier has to rent a warehouse for keeping the excess units over the fixed capacity W of the own warehouse in practice. The rented warehouse owed higher holding cost than the own warehouse. In this paper we considered holding cost, deterioration rate, shortages cost and lost sales as triangular fuzzy numbers. Methods: Graded Mean Integration Representation is used to defuzzify the total cost function. The result obtained by this method is compared with crisp model with the help of a numerical example. Sensitivity analysis is accomplished to changing one parameter at a time and keeping others at their archetypal. Results and conclusions: It has been proved that graded mean integration representation method gives more accurate result as compare to crisp model.
    Wstęp: W pracy zaprezentowano rozmyty model układu dwumagazynowego, składającego się z własnego magazynu (OW) oraz magazyny wynajmowanego (RW) dla asortymentów podlegających psuciu oraz o popycie zależnym od ceny przy dopuszczenia częściowych braków. Ze względu na ograniczoną powierzchnię własną magazynu, dostawca był zmuszony wynająć drugi magazyn w celu magazynowania nadwyżki. Koszt magazynu wynajmowanego jest wyższy niż koszt magazynu własnego. W pracy uwzględniono koszt utrzymywania obiektu, współczynnik psucia, koszt ubytków oraz koszt utraty sprzedaży jak liczby rozmyte. Metody: W celu odwrócenia rozmycia funkcji całkowitego kosztu użyto metody Graded Mean Integration Representation. Otrzymane wyniki porównano z modelem Crisp przy pomocy przykładu liczbowego. Następnie wykonano analizę wrażliwości zmieniają jeden z parametrów przy utrzymaniu niezmienionych pozostałych. Wyniki i wnioski: Wykazano, że wyniki uzyskane przy zastosowaniu metody Graded Mean Integration Representation są dokładniejsze aniżeli przy zastosowaniu modelu Crisp.
    Źródło:
    LogForum; 2019, 15, 4; 487-499
    1734-459X
    Pojawia się w:
    LogForum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reliability study on non-contact traction power supplysystem based on fuzzy grey relational FTA
    Autorzy:
    Pei, Yanxia
    Li, Xin
    Powiązania:
    https://bibliotekanauki.pl/articles/1841276.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    FTA
    grey relational degree
    ICPT technology
    reliability research
    trapezoidal fuzzy number
    triangular fuzzy number
    szary stopień relacyjny
    technologia ICPT
    badania wiarygodności
    trapezoidalna liczba rozmyta
    trójkątna liczba rozmyta
    Opis:
    The traction power supply system based on Inductively Coupled Power Transfer (ICPT) technology is one of the new traction power supply technologies that will bedeveloped in the future. As the core part of rail transit energy transfer and conversion, thetraction power supply system is not only the critical system for the safe operation of railtransit, but also the main source of its failures, so it is of great significance to study itsreliability. In this paper, the reliability analysis of the non-contact traction power supplysystem based on mobile ICPT technology is carried out using the method of (Fault Tree Analysis) FTA combined with triangular fuzzy theory and grey relational theory. Firstly,the fault tree of the system is established, and the minimum cut sets and structure functionof the fault tree are obtained. Then the triangular fuzzy numbers are introduced to representthe probability of the bottom events, and the fuzzy probability of the top event and the fuzzyimportance of the bottom events are determined, after that, the maximum probability offailure of the top event is obtained. Finally, the grey relational degrees of each minimum cutset are obtained and ranked. Furthermore, in order to prove the correctness of this method,the trapezoidal fuzzy FTA is introduced and compared with it. Both research results showthat the loosely coupled transformer and Insulated Gate Bipolar Transistor (IGBT) moduleare the weak links of the system. The results obtained are consistent and realistic, whichproves the correctness of the method selected in this article.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 2; 253-270
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the Effects of the Incident Flow Angle on Vibration Behavior in Heat Exchanger Tube Bundle
    Autorzy:
    Usman, Muhammad
    Khushnood, Shahab
    Nizam, Luqman Ahmad
    Tanveer, Waqas
    Shafi, Ahmad
    Ayub, Muhammad
    Khan, Hassan Farid
    Rustam, Behzad
    Powiązania:
    https://bibliotekanauki.pl/articles/102083.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    incident flow angle
    fluid elastic instability
    flow-induced vibration
    parallel triangular array
    cross flow velocity
    flexible tube
    kąt przepływu
    niestabilność sprężysta płynu
    drgania indukowane przepływem
    równoległy układ trójkątny
    prędkość przepływu poprzecznego
    elastyczna rura
    Opis:
    An experimental study on the incident flow angle effects on the vibration behavior was carried out on aluminum tube in parallel triangular tube bundle with P/D ratio of 1.375. Fluid elastic instability is the most fatal mechanism from all the vibration mechanisms and therefore must be dealt with a lot of attention. Experiments were performed on low speed water tunnel with the velocity of water ranges from 0.3 m/s to 0.7 m/s. The experiments were designed in a unique way to study the effects of incident flow angle on the vibration behavior. The monitored tube was mounted flexibly in an array of rigid tubes. The experiments were conducted on a flexible tube for different velocities ranging from 0.3 m/s to 0.7 m/s with different array rotated angles (0 to 90 degrees). It was observed that the vibration level was significantly high at 75 degree configuration as compared to other rotated angle configurations. It was also observed that the damping response is dispersed with all positive values, indicating that there is no instability in the tube.
    Źródło:
    Advances in Science and Technology. Research Journal; 2019, 13, 2; 186-194
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new closed-form formula for calculating a weakly singular static potential integral with linear current source distribution on a triangle
    Autorzy:
    Grytsko, Anna
    Słobodzian, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/2204516.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    static vector potential integral
    linear current source distribution
    analytic integration
    isoparametric transformation
    integration over a triangular domain
    weakly singular integral
    statyczna wektorowa całka potencjalna
    liniowy rozkład źródła prądu
    integracja analityczna
    słabo osobliwe całki
    transformacja izoparametryczna
    integracja w domenie trójkątnej
    Opis:
    The article presents a closed-form formula for solving a weakly singular surface integral with a linear current source distribution associated with the SIE-MoM formulation used for solving electromagnetic (EM) problems. The analytical formula was obtained by transforming the surface integral over a triangular domain into a double integral, and then directly determining formulas for the inner and outer integrals. The solution obtained is marked by high computational efficiency, high accuracy, and very simple implementation. The derived formula, in contrast to the currently available formulas, consists of quantities that have a clear and simple geometric interpretation, related to the geometry of the computational domain.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 1; art. no. e143645
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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