Range of validity of weakly non-linear theory in Rayleigh-Bénard problem

In this paper we examine the equilibrium states of finite amplitude flow in a horizontal fluid layer with differential heating between the two rigid boundaries. The solutions to the Navier-Stokes equations are obtained by means of a perturbation method for evaluating the Landau constants and through a Newton-Raphson iterative method that results from the Fourier expansion of the solutions that bifurcate above the linear stability threshold of infinitesimal disturbances. The results obtained from these two different methods of evaluating the convective flow are compared in the neighborhood of the critical Rayleigh number. We find that for small Prandtl numbers the discrepancy of the two methods is noticeable. © 2009 The Physical Society of Japan.

Range of validity of weakly non-linear theory in Rayleigh-Bénard convection

In this paper we examine the equilibrium states of periodic finite amplitude flow in a horizontal channel with differential heating between the two rigid boundaries. The solutions to the Navier-Stokes equations are obtained by means of a perturbation method for evaluating the Landau coefficients and through a Newton-Raphson iterative method that results from the Fourier expansion of the solutions that bifurcate above the linear stability threshold of infini- tesimal disturbances. The results obtained from these two different methods of evaluating the convective flow are compared in the neighbourhood of the critical Rayleigh number. We find that for small Prandtl numbers the discrepancy of the two methods is noticeable.

Paleopharmacology and pollen: theory, method, and application

Parasitism was a universal human condition. Because of this, people developed herbal medicines to treat parasites as part of their pharmacopoeias. We propose that it is possible to recover evidence of medicinal plants from archaeological sites and link their use to specific health conditions. This is a multidisciplinary approach that must involve at least paleoethnobotanists, archaeoparasitologists, paleopathologists, and pharmacologists.

Linear scanning method based on the SAFT coarray

This work presents a method to obtain B-scan images based on linear array scanning and 2R-SAFT. Using this technique some advantages are obtained: the ultrasonic system is very simple; it avoids the grating lobes formation, characteristic in conventional SAFT; and subaperture size and focussing lens (to compensate emission-reception) can be adapted dynamically to every image point. The proposed method has been experimentally tested in the inspection of CFRP samples. © 2010 American Institute of Physics.

A novel information theory method for filter feature selection

In this paper, we propose a novel filter for feature selection. Such filter relies on the estimation of the mutual information between features and classes. We bypass the estimation of the probability density function with the aid of the entropic-graphs approximation of Rényi entropy, and the subsequent approximation of the Shannon one. The complexity of such bypassing process does not depend on the number of dimensions but on the number of patterns/samples, and thus the curse of dimensionality is circumvented. We show that it is then possible to outperform a greedy algorithm based on the maximal relevance and minimal redundancy criterion. We successfully test our method both in the contexts of image classification and microarray data classification.

The teacher's encyclopaedia of the theory, method, practice, history and development of education at home and abroad, written by many of the most eminent educational writers, thinkers, professors and teachers of the day,

Some of the plates are printed on both sides.

Accounting in business decisions: theory, method, and use

Includes bibliography.

Linear theory of hydrologic systems /

"...shortened version of lectures given....in August 1967..."

On being thrown into phenomenological research: a book review of J.A. Smith, P. Flowers & M. Larkin (2009) Interpretative Phenomenological Analysis: Theory, method and research. London: Sage.

Book review

Kultúraközi szolgáltatásélmények vizsgálata a megalapozott elmélet módszerével (Examination of the intercultural service experiences with grounded theory method)

A cikk fókuszában az interkulturális szolgáltatással való találkozás áll. A téma jelentősége kétségen kívül áll, hiszen a szolgáltatások egyre növekvő térhódítása, valamint a globalizáció terjedése fontossá teszi annak ismeretét, hogy a különböző nemzeti kultúrából érkező szolgáltató és fogyasztó számára hogyan érhető el a legfőbb cél, az elégedettség. A szerzők jelen kutatásukban annak megértését helyezték a középpontba, hogy melyek azok a tényezők, amelyek befolyásolják a felek erőfeszítéseit a találkozás során fellépő problémák megoldásában. Kutatásuk során mélyinterjúkat folytattak mind a szolgáltatói, mind a fogyasztói oldallal, majd a megalapozott elmélet (grounded theory) konstruktivista irányzatának segítségével elemezték ezen interjúkat, és azonosították azokat a tényezőket, amelyek fontossá válhatnak egy kultúraközi szolgáltatásélmény során. A kutatás eredményei rámutatnak, hogy melyek azok a kommunikációs és kulturális korlátok, amelyek problémát okozhatnak, s hogy az e problémák megoldására tett erőfeszítések visszavezethetők az interakció résztvevőinek személyes jellemzőire, tapasztalataira, kulturális nyitottságára és ismereteire. A kutatás eredményeinek egyik fontos menedzseri következtetése, hogy a szállodákban a probléma jelentősége ellenére nem helyeznek elegendő hangsúlyt a kommunikációs és kulturális korlátok leküzdésére irányuló képzésekre, tréningekre. _____ This paper presents an attempt to analyse the possible solutions to problems that can occur during intercultural service encounters (ICSE). Using grounded theory the authors provide a theoretical framework that identifies the factors that lead to ICSE barriers. Based on in-depth interviews with service providers and clients they have defined the relevant characteristics that influence intercultural competence. Intercultural competence with communication and cultural differences lead to problems during ICSE that can be handled by both parties: the service provider and the client, as well. An important finding is that service companies should provide adequate training that concentrates not only on the cultural knowledge but it should create capability in understanding and adapting to cultural differences.

Kaukolämpöverkoston laskentaohjelmiston uudistaminen

Diplomityön tavoitteena on kehittää Komartek Oyj:n kaukolämpöverkoston laskentaohjelmistoa. Tarkoituksena on kehittää laskentaohjelmiston nykyisiä ominaisuuksia sekä lisätä ohjelmistoon uusia ominaisuuksia. Diplomityön alussa tutustuttiin laskentaohjelmistoon ja sen toiminta raportointiin. Tämän jälkeen aloitettiin uusien ominaisuuksien määrittäminen ja lisääminen ohjelmistoon. Diplomityössä käsitellään kaukolämpöverkoston virtauslaskennan teoriaa yleisesti sekä kaukolämpöverkostossa olevien laskennallisten elementtien huomioiminen verkostolaskennnassa.

Studying nonlinear effects on the early stage of phase ordering using a decomposition method

Nonlinear effects on the early stage of phase ordering are studied using Adomian's decomposition method for the Ginzburg-Landau equation for a nonconserved order parameter. While the long-time regime and the linear behavior at short times of the theory are well understood, the onset of nonlinearities at short times and the breaking of the linear theory at different length scales are less understood. In the Adomians decomposition method, the solution is systematically calculated in the form of a polynomial expansion for the order parameter, with a time dependence given as a series expansion. The method is very accurate for short times, which allows to incorporate the short-time dynamics of the nonlinear terms in a analytical and controllable way. (c) 2005 Elsevier B.V. All rights reserved.

Modelo de tomada de decisão integrando teoria das restrições, programação linear e simulação: estudo de caso numa Indústria Siderúrgica

Pós-graduação em Engenharia Mecânica - FEG