Página 1 dos resultados de 648 itens digitais encontrados em 0.009 segundos

## Trajectória de vida das famílias com filho deficiente

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During the first half of the Master, in the SINV chair, I outlined the objectives of the “Final Draft of Dissertation”, at that time known as pre-project. The title chosen was “The way of life of the families with disabled children and their turning points”. When I started the exercise of social assistance functions in the CED A.A.C.F., I attended an initial training which was dedicated to the supporters of students whose parents would participate in the “XII World Deafblind Conference”, realized in 1999, in Lisbon, and organized by CED António Aurélio da Costa Ferreira, I heard that about 70% of couples with disabled children are separated. When I started the Master, I considered appropriate to renew the look of the pathway of life for the families of CED, the “moments coping, and turning points” and thus was born the theme of the Dissertation. Two specialists had answered to my questions, . Fátima Martinho, Master in Psychology, assessor of the Direction, actually is co-ordinating the Center New Chances and the professor Doctor António Rebelo who exerted the functions of Director of the CED António Aurélio during 12 years. And after seventeen parents. I was worried about couples separated in more than 50% of the situations. Some of the spouses...

## Turning Points in the Life Course: Current Findings and Future Directions in Drug Use Research

Teruya, Cheryl; Hser, Yih-Ing
Tipo: Artigo de Revista Científica
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Turning point, a key concept in the developmental life course approach, is currently understudied in the field of substance abuse, but merits further research. A turning point often involves a particular event, experience, or awareness that results in changes in the direction of a pathway or persistent trajectory over the long-term. This article (1) provides an overview of the relevant literature on the concept of turning points from the life course and developmental criminology perspectives, (2) reviews literature on turning points in substance use, (3) discusses methodological considerations, and (4) suggests areas for future research on turning points in drug use. The influence of life course concepts related to drug use trajectories and turning points (including, for example, timing and sequencing of life events, individual characteristics, human agency, and social and historical context) offers a potentially fruitful area of investigation that may increase our understanding of why and how drug users stop and resume using over the long-term. Further research on turning points may be particularly valuable in unpacking the multifaceted and complex underlying mechanisms and factors involved in lasting changes in drug use.

## Turning points in the evolution of peroxidase–catalase superfamily: molecular phylogeny of hybrid heme peroxidases

Zámocký, Marcel; Gasselhuber, Bernhard; Furtmüller, Paul G.; Obinger, Christian
Fonte: Springer Basel Publicador: Springer Basel
Tipo: Artigo de Revista Científica
EN
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Heme peroxidases and catalases are key enzymes of hydrogen peroxide metabolism and signaling. Here, the reconstruction of the molecular evolution of the peroxidase–catalase superfamily (annotated in pfam as PF00141) based on experimentally verified as well as numerous newly available genomic sequences is presented. The robust phylogenetic tree of this large enzyme superfamily was obtained from 490 full-length protein sequences. Besides already well-known families of heme b peroxidases arranged in three main structural classes, completely new (hybrid type) peroxidase families are described being located at the border of these classes as well as forming (so far missing) links between them. Hybrid-type A peroxidases represent a minor eukaryotic subfamily from Excavates, Stramenopiles and Rhizaria sharing enzymatic and structural features of ascorbate and cytochrome c peroxidases. Hybrid-type B peroxidases are shown to be spread exclusively among various fungi and evolved in parallel with peroxidases in land plants. In some ascomycetous hybrid-type B peroxidases, the peroxidase domain is fused to a carbohydrate binding (WSC) domain. Both here described hybrid-type peroxidase families represent important turning points in the complex evolution of the whole peroxidase–catalase superfamily. We present and discuss their phylogeny...

## Detection of Financial Time Series Turning Points: A New CUSUM Approach Applied to IPO Cycles

Blondell, David; Hoang, Philip; Powell, John G; Shi, Jing
Tipo: Working/Technical Paper Formato: 169552 bytes; application/pdf
EN_AU
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This paper presents a new Cumulative Sum approach for the detection of turning points in financial time series that are subject to cyclical mean level and volatility regime shifts. The new CUSUM approach is applied to the problem of detecting turning points in “hot issue” markets for Initial Public Offerings (IPOs), thus providing a multi-dimensional characterization of states of the IPO cycle.; no

## Learning turning points—in life with long-term illness—visualized with the help of the life-world philosophy

Berglund, Mia M. U.
Fonte: Co-Action Publishing Publicador: Co-Action Publishing
Tipo: Artigo de Revista Científica
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A long-term illness is an occurrence that changes one's life and generates a need to learn how to live with it. This article is based on an empirical study of interviews on people living with different long-term illnesses. The results have shown that the learning process is a complex phenomenon interwoven with life as a whole. The essential meaning of learning to live with long-term illness concerns a movement toward a change of understanding of access to the world. In this movement, in which everyday lives as well as relationships with oneself and others are affected, a continual renegotiation is needed. Texts from existential/lifeworld philosopher, Heidegger and Gadamer, have been used to get a greater understanding of the empirical results. These texts have been analysed with particular focus on learning turning points and the importance of reflection. The results are highlighted under the following themes: Pursuit of balance—the aim of learning, The tense grip—the resistance to learning, To live more really—the possibilities of the learning, Distancing—the how of the learning, and The tense of the learning—the whole of the learning. In those learning turning points are present. Knowledge from this study has been used to make a didactic model designed to give caregivers a tool to support patients’ learning. The didactic model is called: The challenge to take charge of life with a long-term illness.

## Quantum Gravity and Turning Points in the Semiclassical Approximation

Keski-Vakkuri, Esko; Mathur, Samir D.
Tipo: Artigo de Revista Científica
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The wavefunctional in quantum gravity gives an amplitude for 3-geometries and matter fields. The four-space is usually recovered in a semiclassical approximation where the gravity variables are taken to oscillate rapidly compared to matter variables; this recovers the Schrodinger evolution for the matter. We examine turning points in the gravity variables where this approximation appears to be troublesome. We investigate the effect of such a turning point on the matter wavefunction, in simple quantum mechanical models and in a closed minisuperspace cosmology. We find that after evolving sufficiently far from the turning point the matter wavefunction recovers to a form close to that predicted by the semiclassical approximation, and we compute the leading correction (from `backreaction') in a simple model. We also show how turning points can appear in the gravitational sector in dilaton gravity. We give some remarks on the behavior of the wavefunctional in the vicinity of turning points in the context of dilaton gravity black holes.; Comment: 32 pages, 3 Postscript figures, uses epsf.tex and fps.sty, some discussion, references and Acknowledgements added, version to appear in Phys. Rev. D

## Complex classical motion in potentials with poles and turning points

Bender, Carl M.; Hook, Daniel W.
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
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Complex trajectories for Hamiltonians of the form H=p^n+V(x) are studied. For n=2 time-reversal symmetry prevents trajectories from crossing. However, for n>2 trajectories may indeed cross, and as a result, the complex trajectories for such Hamiltonians have a rich and elaborate structure. In past work on complex classical trajectories it has been observed that turning points act as attractors; they pull on complex trajectories and make them veer towards the turning point. In this paper it is shown that the poles of V(x) have the opposite effect --- they deflect and repel trajectories. Moreover, poles shield and screen the effect of turning points.; Comment: 10 pages, 16 figures

## Orbits of turning points for maps of finite graphs and inverse limit spaces

Raines, Brian
Tipo: Artigo de Revista Científica
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In this paper we examine the topology of inverse limit spaces generated by maps of finite graphs. In particular we explore the way in which the structure of the orbits of the turning points affects the inverse limit. We show that if $f$ has finitely many turning points each on a finite orbit then the inverse limit of $f$ is determined by the number of elements in the $\omega$-limit set of each turning point. We go on to identify the local structure of the inverse limit space at the points that correspond to points in the $\omega$-limit set of $f$ when the turning points of $f$ are not necessarily on a finite orbit. This leads to a new result regarding inverse limits of maps of the interval.; Comment: 11 pages

## An algorithm for autonomously plotting solution sets in the presence of turning points

Pollack, Steven; Badali, Daniel; Pollack, Jonathan
Tipo: Artigo de Revista Científica
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Plotting solution sets for particular equations may be complicated by the existence of turning points. Here we describe an algorithm which not only overcomes such problematic points, but does so in the most general of settings. Applications of the algorithm are highlighted through two examples: the first provides verification, while the second demonstrates a non-trivial application. The latter is followed by a thorough run-time analysis. While both examples deal with bivariate equations, it is discussed how the algorithm may be generalized for space curves in $\R^{3}$.; Comment: 9 pages, 4 figures

## Local prediction of turning points of oscillating time series

Kugiumtzis, D.
Tipo: Artigo de Revista Científica
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For oscillating time series, the prediction is often focused on the turning points. In order to predict the turning point magnitudes and times it is proposed to form the state space reconstruction only from the turning points and modify the local (nearest neighbor) model accordingly. The model on turning points gives optimal prediction at a lower dimensional state space than the optimal local model applied directly on the oscillating time series and is thus computationally more efficient. Monte Carlo simulations on different oscillating nonlinear systems showed that it gives better predictions of turning points and this is confirmed also for the time series of annual sunspots and total stress in a plastic deformation experiment.; Comment: 7 pages, 5 figures, 2 tables, submitted to PRE

## On the existence of turning points in D-dimensionsal Schwarzschild-de Sitter and anti-de Sitter spacetimes

Bessa, C. H. G.; Lima, J. A. S.
Tipo: Artigo de Revista Científica
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We investigate the motion of a test particle in a d-dimensional, spherically symmetric and static space-time supported by a mass $M$ plus a $\Lambda$-term. The motion is strongly dependent on the sign of $\Lambda$. In Schwarzschild-de Sitter (SdS) space-time ($\Lambda > 0$), besides the physical singularity at $r=0$ there are cases with two horizons and two turning points, one horizon and one turning point and the complete absence of horizon and turning points. For Schwarzschild-Anti de Sitter (SAdS) space-time ($\Lambda < 0$) the horizon coordinate is associated to a unique turning point.; Comment: 7 pages, no figures, accepted for publication in IJMPD

## Potential turning points in cluster radioactivity

Basu, D. N.
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
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Effects of various nuclear interaction potentials on the decay lifetimes and the turning points of the WKB action integral has been studied. The microscopic nuclear potential obtained by folding in the density distribution functions of the two clusters with a realistic effective interaction has also been used to calculate the turning points. Half lives of alpha and ^{20}O cluster emissions from ^{228}Th have been calculated within the superasymmetric fission model using various phenomenological and the microscopic double folding potentials. Calculations of half lives with the microscopic double folding potentials are found to be in good agreement with the observed experimental data. Present calculations put the superasymmetric fission model on a firm theoretical basis.; Comment: 7 pages, 1 figure

## Virtual turning points and bifurcation of Stokes curves for higher order ordinary differential equations

Aoki, Takashi; Kawai, Takahiro; Sasaki, Shunsuke; Shudo, Akira; Takei, Yoshitsugu
Tipo: Artigo de Revista Científica
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For a higher order linear ordinary differential operator P, its Stokes curve bifurcates in general when it hits another turning point of P. This phenomenon is most neatly understandable by taking into account Stokes curves emanating from virtual turning points, together with those from ordinary turning points. This understanding of the bifurcation of a Stokes curve plays an important role in resolving a paradox recently found in the Noumi-Yamada system, a system of linear differential equations associated with the fourth Painleve equation.; Comment: 7 pages, 4 figures

## Autoregressive short-term prediction of turning points using support vector regression

El-Yaniv, Ran; Faynburd, Alexandra
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
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This work is concerned with autoregressive prediction of turning points in financial price sequences. Such turning points are critical local extrema points along a series, which mark the start of new swings. Predicting the future time of such turning points or even their early or late identification slightly before or after the fact has useful applications in economics and finance. Building on recently proposed neural network model for turning point prediction, we propose and study a new autoregressive model for predicting turning points of small swings. Our method relies on a known turning point indicator, a Fourier enriched representation of price histories, and support vector regression. We empirically examine the performance of the proposed method over a long history of the Dow Jones Industrial average. Our study shows that the proposed method is superior to the previous neural network model, in terms of trading performance of a simple trading application and also exhibits a quantifiable advantage over the buy-and-hold benchmark.

## Commodity Prices Rise Sharply at Turning Points

Li, Bin; Wong, K. Y. Michael; Chan, Amos H. M.; So, Tsz Yan; Heimonen, Hermanni; Saad, David
Tipo: Artigo de Revista Científica
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Commodity prices depend on supply and demand. With an uneven distribution of resources, prices are high at locations starved of commodity and low where it is abundant. We introduce an agent-based model in which agents set their prices to maximize profit. At steady state, the market self-organizes into three groups: excess producers, consumers, and balanced agents. When resources are scarce, prices rise sharply at a turning point due to the disappearance of excess producers. Market data of commodities provide evidence of turning points for essential commodities, as well as a yield point for non-essential ones.; Comment: 7 pages, 7 figures, 1 table, Supporting Information available at http://physics.ust.hk/phkywong/supporting2.pdf

## On non-definite Sturm-Liouville problems with two turning points

Kikonko, Mervis; Mingarelli, Angelo B.
Tipo: Artigo de Revista Científica
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This is an inaugural study of the Dirichlet problem associated with a regular non-definite Sturm-Liouville equation in the case of two turning points. We give a priori lower bounds on the Richardson numbers associated with this problem thereby complementing pioneering results by Atkinson and Jabon (1984) in the one turning point case; Comment: 13 pages, To appear in Applied Math. and Computation

## Turning points and returning points : understanding the role of family ties in the process of desistance

Cid Moliné, Josep; Martí Olivé, Joel
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/acceptedVersion Formato: application/pdf
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The objective of this article is to identify the interpersonal factors that explain narratives of desistance among offenders who have been sentenced to prison. Through narrative interviews, we have studied a purposeful age-graded sample of men convicted of acquisitive crimes. Although the results confirm the leading research of Laub and Sampson (2003) about the importance of social bonds as a change catalyst, they also suggest that changes in narratives may depend not only on participation in new social institutions but also on the new meaning that institutions present during the criminal career of offenders, such as family relationships, may acquire in adulthood.

## A High-Order Method for Stiff Boundary Value Problems with Turning Points

Brown, David L.; Lorenz, Jens
Fonte: Society for Industrial and Applied Mathematics Publicador: Society for Industrial and Applied Mathematics
Tipo: Article; PeerReviewed Formato: application/pdf
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This paper describes some high-order collocation-like methods for the numerical solution of stiff boundary-value problems with turning points. The presentation concentrates on the implementation of these methods in conjunction with the implementation of the a priori mesh construction algorithm introduced by Kreiss, Nichols and Brown [SIAM J. Numer. Anal., 23 (1986), pp. 325–368] for such problems. Numerical examples are given showing the high accuracy which can be obtained in solving the boundary value problem for singularly perturbed ordinary differential equations with turning points.

## Os pontos de virada na formação do professor universitário: um estudo sobre o mecanismo da identificação; The "turning points" in the formation of the university teacher: a study of the mechanism of identification

Riolfi, Claudia Rosa; Alaminos, Cláudia
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; ; ; ; ; Formato: application/pdf