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Wyświetlanie 1-15 z 16
Tytuł:
Bulbospinal catecholamine neurones and sympathetic pattern generation
Autorzy:
Coote, J H
Lewis, D.I.
Powiązania:
https://bibliotekanauki.pl/articles/70075.pdf
Data publikacji:
1995
Wydawca:
Polskie Towarzystwo Fizjologiczne
Tematy:
catecholamine neuron
sympathetic pattern generation
brain tissue
preganglionic neuron
dopamine
noradrenaline
cardiovascular system
rat
Źródło:
Journal of Physiology and Pharmacology; 1995, 46, 3
0867-5910
Pojawia się w:
Journal of Physiology and Pharmacology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laser Metal Deposition and Wire Arc Additive Manufacturing of Materials: An Overview
Autorzy:
Rumman, R.
Lewis, D. A.
Hascoet, J. Y.
Quinton, J. S.
Powiązania:
https://bibliotekanauki.pl/articles/352724.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
additive manufacturing
laser metal deposition
wire arc
microstructure
Opis:
Additive manufacturing (AM) is a process that joins similar or dissimilar materials into application-oriented objects in a wide range of sizes and shapes. This article presents an overview of two additive manufacturing techniques; namely Laser metal deposition (LMD) and Wire arc additive manufacturing (WAAM). In LMD, metallic powders are contained in one or more chambers, which are then channelled through deposition nozzles. A laser heats the particles to produce metallic beads, which are deposited in layers with the aid of an in-built motion system. In WAAM, a high voltage electric arc functions as the heat source, which helps with ensuring deposition of materials, while materials in wire form are used for the feedstock. This article highlights some of the strengths and challenges that are offered by both processes. As part of the authors’ original research work, Ti-6Al-4V, Stainless steel 316L and Al-12Si were prepared using LMD, while the WAAM technique was used to prepare two Al alloys; Al-5356 and CuAl8Ni2. Microstructural analysis will focus on similarity and differences in grains that are formed in layers. This article will also offer an overall comparison on how these samples compare with other materials that have been prepared using LMD and WAAM.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 467-473
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Graded hyponymy for compositional distributional semantics
Autorzy:
Bankova, D.
Coecke, B.
Lewis, M.
Marsden, D.
Powiązania:
https://bibliotekanauki.pl/articles/103883.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Podstaw Informatyki PAN
Tematy:
categorical semantics
compositional semantics
distributional semantics
computational linguistics
entailment
density operator
Opis:
The categorical compositional distributional model of natural language provides a conceptually motivated procedure to compute the meaning of a sentence, given its grammatical structure and the meanings of its words. This approach has outperformed other models in mainstream empirical language processing tasks, but lacks an effective model of lexical entailment. We address this shortcoming by exploiting the freedom in our abstract categorical framework to change our choice of semantic model. This allows us to describe hyponymy as a graded order on meanings, using models of partial information used in quantum computation. Quantum logic embeds in this graded order.
Źródło:
Journal of Language Modelling; 2018, 6, 2; 225-260
2299-856X
2299-8470
Pojawia się w:
Journal of Language Modelling
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Choice of Subspace for Iterative Methods for Linear Discrete Ill-Posed Problems
Autorzy:
Calvetti, D.
Lewis, B.
Reichel, L.
Powiązania:
https://bibliotekanauki.pl/articles/908057.pdf
Data publikacji:
2001
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
metoda sprzężonych gradientów
problem niewłaściwie postawiony
minimal residual method
conjugate gradient method
ill-posed problems
Opis:
Many iterative methods for the solution of linear discrete ill-posed problems with a large matrix require the computed approximate solutions to be orthogonal to the null space of the matrix. We show that when the desired solution is not smooth, it may be possible to determine meaningful approximate solutions with less computational work by not imposing this orthogonality condition.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2001, 11, 5; 1069-1092
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Online learning algorithm for zero-sum games with integral reinforcement learning
Autorzy:
Vamvoudakis, K. G.
Vrabie, D.
Lewis, F. L.
Powiązania:
https://bibliotekanauki.pl/articles/91780.pdf
Data publikacji:
2011
Wydawca:
Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:
learning
online algorithm
zero-sum game
game
infinite horizon
Hamilton-Jacobi-Isaacs equation
approximation network
optimal value function
adaptive control tuning algorithm
Nash solution
Opis:
In this paper we introduce an online algorithm that uses integral reinforcement knowledge for learning the continuous-time zero sum game solution for nonlinear systems with infinite horizon costs and partial knowledge of the system dynamics. This algorithm is a data based approach to the solution of the Hamilton-Jacobi-Isaacs equation and it does not require explicit knowledge on the system’s drift dynamics. A novel adaptive control algorithm is given that is based on policy iteration and implemented using an actor/ disturbance/critic structure having three adaptive approximator structures. All three approximation networks are adapted simultaneously. A persistence of excitation condition is required to guarantee convergence of the critic to the actual optimal value function. Novel adaptive control tuning algorithms are given for critic, disturbance and actor networks. The convergence to the Nash solution of the game is proven, and stability of the system is also guaranteed. Simulation examples support the theoretical result.
Źródło:
Journal of Artificial Intelligence and Soft Computing Research; 2011, 1, 4; 315-332
2083-2567
2449-6499
Pojawia się w:
Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 16

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