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Wyświetlanie 1-15 z 26
Tytuł:
Relative tangent cone of analytic curves
Autorzy:
Ciesielska, Danuta
Powiązania:
https://bibliotekanauki.pl/articles/1293937.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
intersection multiplicity
analytic curve
tangent cone
relative tangent cone
Opis:
The purpose of this paper is to give a characterization of the relative tangent cone of two analytic curves in $ℂ^m$ with an isolated intersection.
Źródło:
Annales Polonici Mathematici; 1999, 72, 2; 191-195
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
How do mathematics textbooks address students misconceptions? The case of the tangent line
Autorzy:
Pieronkiewicz, Barbara
Powiązania:
https://bibliotekanauki.pl/articles/748928.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
tangent line, common points of a tangent and a curve, misconceptions, textbook analysis.
Opis:
The study presented in this paper is a part of a substantive analysis of different didactical phenomena in relation to several mathematical concepts, conducted at the preparatory stage of a project aimed at investigating substantive and didactical competencies of pre-service teachers of mathematics. What I report here, relates to the exploration of didactical phenomena in relation to the tangent concept. Since school textbooks are the most common resource referred to by students and teachers, they deserve particular attention as one of the potential sources of concept images and mathematics-related beliefs of learners. In this article I present results from the analysis of ve, currently most popular, series of Polish secondary school mathematics textbooks. I attempt to answer the question of how the authors of these textbooks address a misconception known to be held by many students, namely that a line tangent to a curve has only one common point with that curve.
Źródło:
Didactica Mathematicae; 2019, 41
2353-0960
Pojawia się w:
Didactica Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical implementation of finite strain elasto-plasticity without yield surface
Autorzy:
Suchocki, C.
Powiązania:
https://bibliotekanauki.pl/articles/949335.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
constitutive equation
tangent moduli
UMAT
plasticity
Opis:
In the present study, the finite element (FE) implementation of elasto-plasticity without a yield surface is discussed. For that purpose, the method of perturbing the deformation gradient tensor is employed to calculate approximate tangent moduli. The development of a user subroutine that enables one to use the proposed model within the FE program ABAQUS is covered. A number of exemplary numerical simulations is conducted in order to check the performance of this subroutine. Material parameter values determined for different materials are utilized. Finally, the presented constitutive equation is examined upon its ability to capture the shear-softening process.
Źródło:
Journal of Theoretical and Applied Mechanics; 2017, 55, 4; 1113-1126
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The modified procedures in coercivity scaling
Autorzy:
Najgebauer, M.
Sokalski, K.
Szczygłowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/141511.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
coercivity
hyperbolic tangent transformation
scaling procedure
Opis:
The paper presents a scaling approach to the analysis of coercivity. The Widom-based procedure of coercivity scaling has been tested for non-oriented electrical steel. Due to insufficient results, the scaling procedure was improved relating to the method proposed by Van den Bossche. The modified procedure of coercivity scaling gave better results, in comparison to the original approach. The influence of particular parameters and a range of measurement data used in the estimations on the final effect of the coercivity scaling were discussed.
Źródło:
Archives of Electrical Engineering; 2015, 64, 3; 351-359
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Second-order necessary conditions for discrete inclusions with end point constraints
Autorzy:
Cernea, Aurelian
Powiązania:
https://bibliotekanauki.pl/articles/729636.pdf
Data publikacji:
2005
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
tangent cone
discrete inclusion
necessary optimality conditions
Opis:
We study an optimization problem given by a discrete inclusion with end point constraints. An approach concerning second-order optimality conditions is proposed.
Źródło:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2005, 25, 1; 47-58
1509-9407
Pojawia się w:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Okręgi styczne do dwóch prostych przecinających się i okręgu
Circles tangential to two straight linew crossing each other and a circle
Autorzy:
Kalinowska, E.
Tejszerska, A.
Terczyńska, E.
Powiązania:
https://bibliotekanauki.pl/articles/119021.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Geometrii i Grafiki Inżynierskiej
Tematy:
okręg styczny
prosta
planimetria
tangent circle
straight
planimetry
Opis:
This article presents seemingly short, nevertheless, interesting task frora piane geometry. It consists in determining circles tangential to two intersecting lines and a circle included between them. It seems to be a very interesting fact in exact sciences that many different ways of reasoning can lead to one aim and this is what appears to be the most interesting issue in the presented solution. Three ways of solving the problem have been presented.
Źródło:
Journal Biuletyn of Polish Society for Geometry and Engineering Graphics; 2001, 11; 39-42
1644-9363
Pojawia się w:
Journal Biuletyn of Polish Society for Geometry and Engineering Graphics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geogebra and problems of tangent circles
Autorzy:
Billich, M.
Powiązania:
https://bibliotekanauki.pl/articles/121755.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane
Tematy:
GeoGebra
kręgi styczne
oprogramowanie geometrii
tangent circles
geometry software
Opis:
There are many mathematical programmes for teaching and learning geometry from middle school to the university level. Dynamic software package Geogebra can help students to explore and understand more concepts in geometry on their own. In this paper we are concentrating in one of the most interesting and less known two-dimensional transformations like inversion with respect to a circle supported by GeoGebra. The use of this transformation through GeoGebra makes possible a number of elegant solutions to classical construction problems in geometry. Contribution of this paper is presentation of some problems which require the construction of the circle tangent to given circles.
Źródło:
Scientific Issues of Jan Długosz University in Częstochowa. Mathematics; 2017, 22; 23-29
2450-9302
Pojawia się w:
Scientific Issues of Jan Długosz University in Częstochowa. Mathematics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variational approach to some optimization control problems
Autorzy:
Bianchini, R.
Powiązania:
https://bibliotekanauki.pl/articles/1359657.pdf
Data publikacji:
1995
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
tangent vectors
variational cone
local controllability
Mayer's optimization problem
Opis:
This paper presents the variational approach to some optimization problems: Mayer's problem with or without constraints on the final point, local controllability of a trajectory, time-optimal problems.
Źródło:
Banach Center Publications; 1995, 32, 1; 83-94
0137-6934
Pojawia się w:
Banach Center Publications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Whispering gallery resonator method for permittivity measurements
Autorzy:
Derzakowski, K.
Abramowicz, A.
Krupka, J.
Powiązania:
https://bibliotekanauki.pl/articles/308148.pdf
Data publikacji:
2002
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
dielectric resonator
permittivity
loss tangent
measurement method
whispering gallery modes
Opis:
The new method of measuring permittivity is described. The measurements are performed using whispering gallery mode open dielectric resonators. The accuracy is assured by applications of the mode matching method. Three resonant modes (HE511, HE611 and HE711) are used in measurement procedure. Accuracy of the method is much better than 0.3% for the relative permittivity having values from 20 to 50.
Źródło:
Journal of Telecommunications and Information Technology; 2002, 1; 43-47
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical study of ferroelectric triglycine sulphate (TGS) crystal in external electric fields
Autorzy:
Upadhyay, T. Ch.
Nautiyal, A.
Powiązania:
https://bibliotekanauki.pl/articles/412113.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
ferroelectric
Green's functions
anharmonic
dielectric constant
loss tangent
coustic attenuation
Opis:
A modified two sub-lattice pseudospin-lattice coupled mode model of Mitsui et al [Phys. Rev., 111 (1958) 1259] by adding third, fourth order phonon anharmonic interaction and external electric field terms has been applied to ferroelectric triglycine sulphate crystal. Electric field dependence of ferroelectric, dielectric and acoustical properties has been studied. With the help of double time temperature dependent Green’s function method, expressions for shift, width, soft mode frequency, dielectric constant, loss tangent and acoustic attenuation have been derived. Numerically calculations have been made and results have been compared with experimental data reported by Bye et al [Ferroelectrics 4 (1974) 243] and Shreekumar et al [Ferroelectrics 160 (1994) 23] for TGS crystal and a good agreement has been observed.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 6; 54-65
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A second-order sufficient condition for a weak local minimum in an optimal control problem with an inequality control constraint
Autorzy:
Osmolovskii, Nikolai P.
Powiązania:
https://bibliotekanauki.pl/articles/2183496.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
critical cone
quadratic form
first order tangent
second order tangent
second order optimality conditions
weak local minimum
inequality control constraint
Pontryagin’s maximum principle
Opis:
This paper is devoted to a sufficient second-order condition for a weak local minimum in a simple optimal control problem with one control constraint G(u) ≤ 0, given by a C2-function. A similar second-order condition was obtained earlier by the author for a strong minimum in a much more general problem. In the present paper, we would like to take a narrower perspective than before and thus provide shorter and simpler proofs. In addition, the paper uses the first and second order tangents to the set U, defined by the inequality G(u) ≤ 0. The main difficulty of the proof, clearly shown in the paper, refers to the set, where the gradient Hu of the Hamiltonian is small, but the condition of quadratic growth of the Hamiltonian is satisfied. The paper can be valuable for self-explanation and provides a basis for extensions.
Źródło:
Control and Cybernetics; 2022, 51, 2; 151--169
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical simulation of the saprapel grinding by means of the shock loads
Autorzy:
Didukh, V.
Polishuuk, M.
Turchyn, I.
Powiązania:
https://bibliotekanauki.pl/articles/411385.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
theory of grinding
dynamic problem
shock load
integral transformations
main tangent stress
Opis:
The article discusses the process of grinding of the solid aggregates of the lacustrine sapropel based on the model of mechanics of deformed solid body. As the result of simulation the initially-final problem on theory of elasticity is solved by the method of integral transformations. The research presents a numerical description of the tensed and deformed states of the solid aggregates of sapropel in dependence with the rates of loadings and geometric parameters. It discovered space and time distribution of the main tangent stresses influencing sufficiently the process of destruc-tion and degree of the given material grinding.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2014, 3, 4; 3-9
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hardware implementation of hyperbolic tangent and sigmoid activation functions
Autorzy:
Hajduk, Z.
Powiązania:
https://bibliotekanauki.pl/articles/200063.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
FPGA
hyperbolic tangent
sigmoid
floating point arithmetic
tangens hiperboliczny
arytmetyka zmiennoprzecinkowa
funkcja sigmoidalna
Opis:
This paper presents the high accuracy hardware implementation of the hyperbolic tangent and sigmoid activation functions for artificial neural networks. A kind of a direct implementation of the functions in a few different versions is proposed and investigated both by software and hardware modeling. A single precision floating point arithmetic is applied. Apart from conventional design style with hardware description language coding, high level synthesis design techniques with the Matlab HDL coder and Xilinx Vivado HLS have also been investigated.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 5; 563-577
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adptive heading control of underactuated unmanned surface vehicle based on improved backpropagation neural network
Autorzy:
Dong, Zaopeng
Li, Jiakang
Liu, Wei
Zhang, Haisheng
Qi, Shijie
Zhang, Zhengqi
Powiązania:
https://bibliotekanauki.pl/articles/32917278.pdf
Data publikacji:
2023
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
underactuated unmanned surface vehicle
backpropagation neural network controller
heading control
hyperbolic tangent function
Opis:
Aiming at the challenges to the accurate and stable heading control of underactuated unmanned surface vehicles arising from the nonlinear interference caused by the overlay and the interaction of multi interference, and also the uncertainties of model parameters, a heading control algorithm for an underactuated unmanned surface vehicle based on an improved backpropagation neural network is proposed. Based on applying optimization theory to realize that the underactuated unmanned surface vehicle tracks the desired yaw angle and maintains it, the improved momentum of weight is combined with an improved tracking differentiator to improve the robustness of the system and the dynamic property of the control. A hyperbolic tangent function is used to establish the nonlinear mappings an approximate method is adopted to summarize the general mathematical expressions, and the gradient descent method is applied to ensure the convergence. The simulation results show that the proposed algorithm has the advantages of strong robustness, strong anti-interference and high control accuracy. Compared with two commonly used heading control algorithms, the accuracy of the heading control in the complex environment of the proposed algorithm is improved by more than 50%.
Źródło:
Polish Maritime Research; 2023, 1; 54-64
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Teoria obrótu noża styczno-obrotowego
Rotating tangent cutters
Autorzy:
Rożenek, Z.
Powiązania:
https://bibliotekanauki.pl/articles/167734.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Górnictwa
Tematy:
nóż styczno-obrotowy
obrót
samoostrzenie
teoria obrotu
rotating tangent cutters
rotation
self-sharpening
rotation the
Opis:
Szerokie zastosowanie noża styczno-obrotowego w technologii pozyskiwania kopalin jest efektem jego podstawowej cechy – obrotu w uchwycie nożowym, co prowadzi do jego tzw. samoostrzenia. Cecha ta w sposób zasadniczy wpływa na ekonomikę procesu produkcyjnego, jego energochłonność, jakość produktu wyjściowego, a w efekcie końcowym na koszt pozyskania kopalin. Obrót noża styczno-obrotowego był i nadal jest tematem doświadczeń oraz rozważań teoretycznych, które wykazały, że jest to zjawisko dość złożone, zależne od wielu czynników. Jednak obecna wiedza, a przede wszystkim efekty pracy tego narzędzia sprawiają, że jest stosowany na szeroką skalę, nie tylko w przemyśle wydobywczym, ale także np. w budownictwie czy drogownictwie.
The wide use of rotating tangent cutter in the technology of minerals’ excavation is the result of its basic feature: capability of rotation in the cutter grip, which leads to its so-called self-sharpening. This feature has a fundamental impact on the economics of the production process, its energy consumption, the quality of the output product and, consequently, on the cost of minerals’ excavation. Rotation of rotating tangent cutters was and still is the subject of experiments, theoretical considerations, which showed that this phenomenon is quite complex, depending on many factors. However, current knowledge and, above all, the effects of the work of this tool, makes it useful on a larger scale, not only in the mining industry but also, for example, in construction or road engineering.
Źródło:
Przegląd Górniczy; 2018, 74, 7; 7-12
0033-216X
Pojawia się w:
Przegląd Górniczy
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 26

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