Temat: numerical differentiation - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Zastosowanie różniczkowania numerycznego z jednoczesnym wygładzaniem w obliczeniach strumienia permeatu podczas mikrofiltracji
Application of the special numerical differentiation method with simultaneous smoothing for calculation of permeate flux in membrane separation processes
Autorzy:: Wołkowiak, J.
Zander, L.
Dajnowiec, F.
Powiązania:: https://bibliotekanauki.pl/articles/2070081.pdf
Data publikacji:: 2009
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: mikrofiltracja
różniczkowanie numeryczne
microfiltration
numerical differentiation
Opis:: Przedstawiono sposób obliczania strumienia permeatu w badaniach kinetyki inikrofiltriicji z zastosowaniem metody Wiechowskiego do różniczkowania numerycznego z jednoczesnym wygładzaniem. Otrzymane wyniki porównano z rezultatami uzyskanymi z wykorzystaniem wzorów interpolacyjnych Lagrange'a oraz metody Savitzky'ego-Golay 'a.
Calculations of permeate flux during investigations of microfiltration kinetics by applying Wieckowski's method of numerical differentiation with simultaneous, smoothing is presented in the paper. The results obtained were compared with those calculated using the Lagrange interpolation formula and Savitzky-Golay method.
Źródło:: Inżynieria i Aparatura Chemiczna; 2009, 1; 74-75
0368-0827
Pojawia się w:: Inżynieria i Aparatura Chemiczna
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Object library of algorithms for dynamic optimization problems; Benchmarking SQP and nonlinear interior point methods
Autorzy:: Błaszczyk, J.
Karbowski, A.
Malinowski, K.
Powiązania:: https://bibliotekanauki.pl/articles/929795.pdf
Data publikacji:: 2007
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: optymalizacja dynamiczna
programowanie kwadratowe sekwencyjne
różniczkowanie automatyczne
obliczenia numeryczne
analiza danych
dynamic optimization
large-scale optimization
sequential quadratic programming
nonlinear interior-point methods
object-oriented numerical computations
automatic differentiation
performance data analysis
Opis:: The main purpose of this paper is to describe the design, implementation and possibilities of our object-oriented library of algorithms for dynamic optimization problems. We briefly present library classes for the formulation and manipulation of dynamic optimization problems, and give a general survey of solver classes for unconstrained and constrained optimization. We also demonstrate methods of derivative evaluation that we used, in particular automatic differentiation. Further, we briefly formulate and characterize the class of problems solved by our optimization classes. The solution of dynamic optimization problems with general constraints is performed by transformation into structured large-scale nonlinear programming problems and applying methods for nonlinear optimization. Two main algorithms of solvers for constrained dynamic optimization are presented in detail: the sequential quadratic programming (SQP) exploring the multistage structure of the dynamic optimization problem during the solution of a sequence of quadratic subproblems, and the nonlinear interior-point method implemented in a general-purpose large-scale optimizer IPOPT. At the end, we include a typical numerical example of the application of the constrained solvers to a large-scale discrete-time optimal control problem and we use the performance profiles methodology to compare the efficiency and robustness of different solvers or different options of the same solver. In conclusions, we summarize our experience gathered during the library development.
Źródło:: International Journal of Applied Mathematics and Computer Science; 2007, 17, 4; 515-537
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Low level of inter-populational differentiation in Juniperus excelsa M. Bieb. (Cupressaceae)
Autorzy:: Mazur, M
Boratynska, K.
Marcysiak, K.
Didukh, Y.
Romo, A.
Kosinski, P.
Boratynski, A.
Powiązania:: https://bibliotekanauki.pl/articles/41190.pdf
Data publikacji:: 2004
Wydawca:: Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:: interpopulational differentiation
low level
plant variation
plant cultivar zob.tez plant variation
plant variation zob.tez plant cultivar
plant taxonomy
juniper
Juniperus excelsa
numerical taxonomy
biometry
Cupressaceae
Opis:: The intra- and inter-population variation in three populations of Juniperus excelsa, two from Crimea and one from the Balkan Peninsula, were analyzed biometrically. Fourteen morphological characters of cones, seeds, shoots and leaves were used. The number of seeds per cone appears to be the most variable character. The others were more stable. Differences among particular individuals within the samples were slight, as well as between populations compared. The Crimean samples were very close to each other, while the more geographically distant sample from the Balkan Peninsula appears also to be morphologically more separate. This suggests that the Balkan populations originated from another Pleistocene refugium. The Crimean populations did not show the reduction of variability, which could have resulted from their geographical isolation and their considerably restricted numbers of individuals.
Źródło:: Dendrobiology; 2004, 52; 39-46
1641-1307
Pojawia się w:: Dendrobiology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Detection of human fall episodes based on coordinates of body tags and numerical differentiation
Autorzy:: Momot, M.
Momot, A.
Nowak, G.
Seredynski, R.
Jezewski, J.
Kupka, T.
Powiązania:: https://bibliotekanauki.pl/articles/333630.pdf
Data publikacji:: 2012
Wydawca:: Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:: otoczenie
wspieranie życia
dane nieregularne objęte próbą
zróżniczkowanie numeryczne
ambient
assisted living
fall detection
irregular sampled data
numerical differentiation
Opis:: This paper presents a new method for detection of changes in alignment of the human body, particularly the fall, on the basis of signals acquired from the position sensors placed on the body of the monitored person. The sensors are located on the cuffs, waist and chest. Transformation of data sequence collected from sensors is proposed in order to best distinguish between the collapse from the normal movement. It is based on nonlinear combination of the first two derivatives of the signals being read. Because data from the sensors is sent asynchronously, a numerical algorithm for unevenly sampled data differentiation is proposed. Derivative values are calculated in equidistant nodes through differentiation of a polynomial, which is adjusted by minimizing the mean square error. The developed method can be used in home care telemedicine systems, where it is necessary to long term monitor of multiple vital parameters of people under care.
Źródło:: Journal of Medical Informatics & Technologies; 2012, 21; 11-17
1642-6037
Pojawia się w:: Journal of Medical Informatics & Technologies
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Application of the maxima in the teaching of science subjects at different levels of knowledge
Autorzy:: Makarewicz, A.
Powiązania:: https://bibliotekanauki.pl/articles/102132.pdf
Data publikacji:: 2014
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: computer program
numerical computation
symbolic computation
symbolic differentiation
symbolic integration
graph
graph three-dimensional
function
Opis:: In this paper I present a program Maxima, which is one of the best computer algebra system (CAS). The program is easy to use and offers many possibilities. In the text the interface, basic commands, and various examples to facilitate complex calculations in almost every field of mathematics are preented. I prove that the program can be used in secondary schools, upper secondary schools and college. Program’s capabilities are presented, including, among others, differentiation and symbolic integration, symbolic solving equations (including differential), simplifying algebraic expressions, matrix operations, the possibility of drawing graphs of 2D / 3D and others.
Źródło:: Advances in Science and Technology. Research Journal; 2014, 8, 24; 44-50
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: A Numerical Algorithm for Filtering and State Observation
Autorzy:: Ibrir, S.
Powiązania:: https://bibliotekanauki.pl/articles/908263.pdf
Data publikacji:: 1999
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: krzywa składana
różniczkowanie numeryczne
obserwator
spline functions
numerical differentiation
observers
smooth filters
Opis:: This paper deals with a numerical method for data fitting and estimation of continuous higher-order derivatives of a given signal from its non-exactsampled data. The proposed algorithm is a generalization of the algorithm proposed by Reinsch (1967). This algorithm is conceived as a key element in the structure of the numerical observer discussed in our recent papers. Satisfactory results are obtained which prove the efficiency of the proposed approach.
Źródło:: International Journal of Applied Mathematics and Computer Science; 1999, 9, 4; 855-869
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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