18 documents found, page 1 of 2
Schreier split extensions of preordered monoids
Martins-Ferreira, N.; Sobral, M.Properties of preordered monoids are investigated and important subclasses of such structures are studied. The corresponding full subcategories are related between them by appropriate functors as well as with the categories of preordered sets and of monoids. Schreier split extensions are described in the full subcategory of preordered monoids whose preorder is determined by the corresponding positive cone.
The network science approach in determining the intellectual structure, emergin...
Pestana, M. H.; Sobral, M.; Wang, W.-C.; Parreira, A.This article focuses on the geriatric market segment which is becoming increasingly important as a result of demographic trends and aging populations. Using network science approach, this study maps the structure of knowledge, its changes over time and research opportunities in Tai-chi. Data collected from Web-of-Science and Scopus between 1996-2019 was used to build a network of 2,202 articles and 6,820 author...
Cancellative conjugation semigroups and monoids
Garrão, A. P.; Martins-Ferreira, Nelson; Raposo, M.; Sobral, M.We show that the category of cancellative conjugation semigroups is weakly Mal’tsev and give a characterization of all admissible diagrams there. In the category of cancellative conjugation monoids we describe, for Schreier split epimorphisms with codomain B and kernel X, all morphisms h: X→ B which induce a reflexive graph, an internal category or an internal groupoid. We describe Schreier split epimorphisms i...
Cognitive reserve and dementia: a scientometric review
Pestana, M. H.; Sobral, M.Research into cognitive reserve (CR) and dementia is advancing rapidly. This paper analyses the intellectual structure, emerging trends and relevant shifts in the development of available knowledge. Data collected from the Web-of-Science produced an expanded network of 564 articles and 12,504 citations in the 1998-2017 period. The co-citation network visualized was characterized by a scientometric review using ...
A new infra-generic classification of the species-rich Neotropical genus Myrcia...
Lucas, E. J.; Amorim, B. S.; Lima, D. F.; Lima-Lourenco, A. R.; Lughadha, E. M. Nic; Proenca, C. E. B.; Rosa, P. O.; Rosario, A. S.; Santos, L. L.Made available in DSpace on 2018-11-26T16:01:10Z (GMT). No. of bitstreams: 0 Previous issue date: 2018-04-01; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); A new classification of the large Neotropical genus Myrcia s.l. is proposed. Nine sections are presented that correspond to recently published clades. Of these nine sections, sects. Myrcia, Aulomyrcia and Sympodiomyrcia are already pu...
The effects of women on corporate boards on firm value, financial performance, ...
Isidro, H.; Sobral, M.The European Commission has recently proposed the introduction of legally binding quotas for women on corporate boards of European companies. This proposal has put the spotlight on the question of whether increasing female representation on the board brings economic benefits to the firm. In order to shed light on the issue, this study investigates the direct and indirect effects of women on the board on firm va...
Cognitive reserve and the severity of Alzheimer’s disease
Sobral, M.; Pestana, M. H.; Paúl, C.Alzheimer's disease (AD) is a clinical syndrome caused by neurodegeneration and characterized by a progressive deterioration in cognitive ability and capacity for independent living. Cognitive reserve (CR) describes the capacity of the adult brain to cope with the effects of the neurodegenerative process and to minimize the clinical manifestation of pathology of dementia. The aim of this study was to evaluate t...
The impact of Cognitive Reserve in neuropsychological and functional abilities ...
Sobral, M.; Pestana, M. H.; Paúl, C.The concept of reserve, according to Stern (2009), has been proposed to account for the disjunction between the degree of brain damage or pathology and its clinical manifestations. There are two kinds of reserve that have been reported to make independent and interactive contributions to preserving function in the face of brain injury: Brain Reserve (passive model of reserve which is based on the quantity of av...
A importância da quantificação da reserva cognitiva
Sobral, M.; Pestana, M. H.; Paúl, C.BACKGROUND: Cognitive Reserve (CR) is a hypothetical construct used to obtain information about cognitive aging, which describes the capacity of the adult brain to cope with the effects of neurodegenerative processes and it is conceived as a dynamic construction. AIMS: Compare the performance of a group of patients with Alzheimer's disease (AD), and a group of healthy elderly people (control) on CR Questionnair...
Measures of cognitive reserve in Alzheimer's disease
Sobral, M.; Pestana, M. H.; Paúl, C.Introduction: Cognitive reserve (CR), a hypothetical construct used to obtain information about cognitive aging, describes the capacity of the adult brain to cope with the effects of neurodegenerative processes. This study evaluated CR using a CR questionnaire (CRQ) and a set of variables (education, leisure activities, lifelong occupation) that inform CR. It also developed a CR index, validated the CRQ, and ex...