Search results for "T method"
showing 10 items of 1254 documents
Broglie and Young, visionaries who shed light in the polar topology that grounds our reality: a hypothesis
2020
Una observación matemática que relaciona los patrones fractales y la operación de convolución en el contexto del procesamiento de imágenes digitales interrumpió una investigación que nos lleva a plantear la hipótesis de que el concepto de onda de materia (o dualidad onda-partícula) se encuentra en la dicotomía entre el par débil y un topología fuerte en el ámbito del marco de atractores singulares continuos en ninguna parte diferenciables y el concepto de fotón-solitón de Vigier. Tal inferencia parece ser más evidente en la interpretación de Broglie-Bohm de la mecánica cuántica en el cruce de características locales x globales. De esto se deduce también que la relación de los fenómenos natu…
Flexural Behavior of Steel Fibrous Reinforced Concrete Deep Beams
2012
Experimental research was carried out regarding the flexural behavior of deep beams cast with plain and fibrous concrete with hooked steel fibers, and subjected to monotonic vertical loads. Four deep fiber-reinforced concrete beams were cast. Two of them were made of plain concrete with main and web steel reinforcements (RC), and two were made of hooked steel fiber-reinforced concrete (SFRC) with main steel reinforcements. The experimental results show the brittle behavior of reinforced deep RC members characterized by crushing of concrete struts and fracture of web steel bars. SFRC deep beams exhibit higher strength and, above all, ductility with respect to RC members due to the bridging a…
Influence of the Resin Layer Thickness at the Interface of Hybrid Metal-composite Co-cured Joints
2011
As discussed in literature, the accurate analysis of the modern co-cured joints between composite materials or between a metal and a composite material (hybrid joints) is complicated by the influence of the interface resin layer on the interface singular stress field. In such joints, in fact, there is not a proper adhesive layer and the thickness of the resin layer, that plays the role of the adhesive, is not constant due to the presence of the reinforcing fibers in the composite adherent. For this reason several authors assume that a generic co-cured joint can not be studied as a simple bi-material joint, without considering the particular characteristics of the actual resin layer. This pr…
”Mitä pitäisi kehittää ja miten?” : lukiolaisten kokemuksia arvioinnista ja sen menetelmistä englannin opinnoissa
2020
Opiskelija-arvioinnilla on merkittävä asema kaikkialla koulumaailmassa, niin myös suomalaisessa lukiossa. Vaikutusvaltaisesta roolistaan huolimatta arviointia ja sen käytännön toteutusta lukiossa tai lukion kieltenopetuksessa on tutkittu niukasti. Tämän tutkimuksen tavoitteena oli tutkia kyselylomakkeen avulla, kuinka lukiolaiset (146 lukiolaista yhdestä koulusta) itse kokivat arvioinnin osana englannin opintojaan, millaisia arviointimenetelmiä he olivat kohdanneet ja mitä niistä he pitivät hyödyllisinä. Tämän tutkimuksen perusteella opiskelijat arvostivat arviointia, jonka he kokivat osuvan varsin oikeaan ja olleen melko monipuolista. Arviointi ei kuitenkaan ohjannut heitä eteenpäin kovink…
Suoliston mikrobit ja fyysinen suorituskyky
2021
Suolistoamme asuttava miljardilukuinen mikrobiyhteisö osallistuu fysiologiaamme monin tavoin. Se kykenee esimerkiksi hajottamaan ravinnosta yhdisteitä, joihin omat entsyymimme eivät pure. Poikittaistutkimuksissa on löydetty ihmisen fyysisen suorituskyvyn ja suolistomikrobien välisiä yhteyksiä. Liikunta-aktiivisuus näyttäisi lisäävän tiettyjen terveysvaikutteisten suolistomikrobien määrää. Pitkittäistutkimuksista tekemämme systemoitu katsaus osoittaa, että liikunta vaikuttaa ihmisten suolistomikrobeihin, mutta tulokset ovat ristiriitaisia. Yleisimmin keskikuormittava kestävyysliikunta on aiheuttanut eniten muutoksia suolistossa, mutta tähänastinen tutkimus on painottunut iäkkäisiin, ylipaino…
A Domain Imbedding Method with Distributed Lagrange Multipliers for Acoustic Scattering Problems
2003
The numerical computation of acoustic scattering by bounded twodimensional obstacles is considered. A domain imbedding method with Lagrange multipliers is introduced for the solution of the Helmholtz equation with a second-order absorbing boundary condition. Distributed Lagrange multipliers are used to enforce the Dirichlet boundary condition on the scatterer. The saddle-point problem arising from the conforming finite element discretization is iteratively solved by the GMRES method with a block triangular preconditioner. Numerical experiments are performed with a disc and a semi-open cavity as scatterers.
A Stieltjes Approach to Static Hedges
2014
Static hedging of complicated payoff structures by standard instruments becomes increasingly popular in finance. The classical approach is developed for quite regular functions, while for less regular cases, generalized functions and approximation arguments are used. In this note, we discuss the regularity conditions in the classical decomposition formula due to P. Carr and D. Madan (in Jarrow ed, Volatility, pp. 417–427, Risk Publ., London, 1998) if the integrals in this formula are interpreted as Lebesgue integrals with respect to the Lebesgue measure. Furthermore, we show that if we replace these integrals by Lebesgue–Stieltjes integrals, the family of representable functions can be exte…
Contributions of mean and shape of blood pressure distribution to worldwide trends and variations in raised blood pressure: A pooled analysis of 1018…
2018
Background: Change in the prevalence of raised blood pressure could be due to both shifts in the entire distribution of blood pressure (representing the combined effects of public health interventions and secular trends) and changes in its high-blood-pressure tail (representing successful clinical interventions to control blood pressure in the hypertensive population). Our aim was to quantify the contributions of these two phenomena to the worldwide trends in the prevalence of raised blood pressure. Methods: We pooled 1018 population-based studies with blood pressure measurements on 88.6 million participants from 1985 to 2016. We first calculated mean systolic blood pressure (SBP), mean dia…
Exact extension of the DIRECT algorithm to multiple objectives
2019
The direct algorithm has been recognized as an efficient global optimization method which has few requirements of regularity and has proven to be globally convergent in general cases. direct has been an inspiration or has been used as a component for many multiobjective optimization algorithms. We propose an exact and as genuine as possible extension of the direct method for multiple objectives, providing a proof of global convergence (i.e., a guarantee that in an infinite time the algorithm becomes everywhere dense). We test the efficiency of the algorithm on a nonlinear and nonconvex vector function. peerReviewed
A New Augmented Lagrangian Approach for $L^1$-mean Curvature Image Denoising
2015
Variational methods are commonly used to solve noise removal problems. In this paper, we present an augmented Lagrangian-based approach that uses a discrete form of the L1-norm of the mean curvature of the graph of the image as a regularizer, discretization being achieved via a finite element method. When a particular alternating direction method of multipliers is applied to the solution of the resulting saddle-point problem, this solution reduces to an iterative sequential solution of four subproblems. These subproblems are solved using Newton’s method, the conjugate gradient method, and a partial solution variant of the cyclic reduction method. The approach considered here differs from ex…