Hamilton dos Prazeres Tavares

• José Eduardo dos Santos University - Angola

To characterise patients with abortion in Huambo, Angola, we have undertaken a descriptive, longitudinal, prospective survey. A structured questionnaire was applied to 715 patients. The study variables were grouped in socio-demographic and clinical-epidemiological variables. There were 29.8% women were aged 20–24, 45.6% had primary education, 41.1%...

This study aims to establish a profile of teenage pregnancy (<20 years) at a hospital in Huambo, Angola. Subjects were categorized into two age groups, 10-16 and 17-19 years. We interviewed 381 mothers in the postpartum maternity ward of the Central Hospital of Huambo. Statistical analysis then followed two stages, a descriptive analysis of the stu...

Background: Metabolic syndrome (MetS) is a cluster of risk factors for type 2 diabetes (Type2 DM) and cardiovascular diseases (CVD), and its prevalence varies based on region, population, and sex. Newborns of women with MetS have a greater risk of adverse perinatal outcomes. This study explores the prevalence of metabolic syndrome in non-diabetic,...

Sexual education is a social responsibility and is a part of the coherent strategy referred to the introduction in schools in Angola. It was made of a prospective, descriptive and longitudinal study that has been characterized the knowledge of sexual education of students in general education in three schools and the Council of Christian Churches i...

This work aims to understand the knowledge and perceptions of women aged over 40 years with breast cancer seen in mastology outpatients at the Maternity Hospital of Huambo, central Angola, from February to August 2010. It also examines the clinical practice of prevention and detection of breast cancer. The research consisted of a collection of desc...

Metabolic syndrome is an epidemic that affects more and more people, increasing the probability of suffering metabolic and cardiovascular diseases in the short, medium or long term depending on the severity. The purpose of this article is to review the metabolic syndrome, assessing consensus , controversy and prevalence. The methodology was the pre...

Background: The metabolic syndrome affects more and more global people. Although it shows in- creasing prevalence in general population, the syndrome affects more women than men, what makes its risk of being developed during pregnancy period. Also, possible perinatal adverse ef- fects are always lurking. Objective: the objective was demonstrated wh...

This paper is concerned with optimal midterm scheduling of large scale hydroelectric power systems. A suitable model for this problem with a minimum number of variables is developed, what leads to a problem of minimizing a particular nonlinear piecewise differentiable function of flows in a network. An algorithm tailored to deal efficiently with th...

A concise mathematical model and nonlinear minimization algorithm were presented as a joint approach to set optimal midterm production targets for power systems with predominance of hydroelectric power generation. The algorithm uses the network structure of the problem and takes into account nondifferentiable points. The approach was successfully a...

Este artigo apresenta uma metodologia para o planejamento da expansão de redes telefônicas urbanas d,entro de um horizonte de longo prazo ( 10 a 20 anos). O problema de expansão de rede é dividido em subproblemas interliga dos cujas resoluções uma ordem hierárquica. Os subproblemas são los de programação matemática solucionados por técnicas de otim...

An approach is proposed to optimize the operation of energy production systems over middle term planning periods. Randomness of primary load is explicitly considered. A precise model is used to represent the hydraulic system (with individualized reservoir in cascade, water transportation delays, nonlinear generation, ...) as well as the non-hydraul...

An approach is proposed to optimize the operation of energy production systems over middle term planning periods. Randomness of primary load is explicitly considered. A precise model is used to represent the hydraulic system (with individualized reservoir in cascade, water transportation delays, nonlinear generation, ...) as well as the non-hydraul...

The problem of locating telephone exchanges in urban area is a basic problem in the telecommunication system planning. Usually, the mathematical models applied fail in representing the realistic aspects of such problem and heuristic techniques should be used to solve it. The classical representation of the urban telephone network is done by dividin...

In this paper an approach is proposed to optimize the operation of large energy production systems, over periods where the independent water inflows can be well known. A precise model is considered to represent the hydraulic system (with individualized reservoir in cascade, water transportation delays, nonlinear generation, ...) as well as the non...

In this paper an approach is proposed to rationalize the operation of large energy production systems, over periods where the independent water inflows and load demands can be well known. A precise model is considered to represent the hydraulic system:individua1ised reservoirs in cascade, water transportation delays, non1inear generations, etc… The...

In this paper decomposition and coordination techniques are applied to minimize the operational cost of hydrothermal power systems. Through this formulation large systems are dealt with by a more general and precise model that includes thermal operation costs and hydroelectric power generation as nonlinear functions, water head variations, stochast...