Search results for "Variable"
showing 10 items of 1674 documents
Soft variable structure controller design for singular systems
2015
Abstract A novel soft variable structure control (SVSC) scheme is addressed for a class of singular systems under I-controllable in this paper. The structural features of SVSC with differential equations are investigated. The stability of singular systems based on SVSC scheme is guaranteed by an equivalent characterization theory, and then a soft variable structure controller is designed. The concrete algorithm of SVSC with differential equations is proposed. The developed SVSC law for singular systems is carried out for the purpose of achieving rapid regulative rate, and shortening arrival time. Moreover, system chattering can be attenuated in the process of approaching to the equilibrium …
Integrated thermodynamic and electrical modelling of a variable-speed reversible heat pump: analysis of the cooling mode operation
2022
Variable-speed reversible heat pumps are increasingly adopted for space heating and cooling in residential and tertiary sectors. It is recognized that these systems will play a key role in medium- and small-scale 4th generation district heating and cooling networks. Indeed, with the high penetration of intermittent renewable energy sources, such technology could help reduce issues related to the surplus of electricity from renewable energy sources by converting it into heat or cold. To reliably assess the benefits achievable in these emerging applications, it is necessary to develop models which can simulate not only the steady-state operation but also the dynamic response of the system wit…
PNA
2009
Bernardo.Gomez@uv.es; Mauricio.Contreras@uv.es Este artículo presenta parte de un estudio que persigue analizar el efecto de las variables de problema y las variables de resolución de problemas en las respuestas de estudiantes de segundo ciclo de educación secundaria obligatoria cuando resuelven problemas multiplicativos de división de fracciones. Se recoge aquí un análisis histórico-epistemológico que ha dado cuenta de los valores de dichas variables y, a partir de resultados preliminares, se sugiere la existencia de interrelaciones entre las variables de problema y las variables de resolución. This article presents part of a study aiming to analyze the effect of problem and problem solvin…
Valoración de la aptitud psicomotora y la inteligencia requerida para conducir en los Centros de Reconocimiento de Conductores
2008
Objetivos, análisis de los aspectos considerados en la valoración de las aptitudes perceptivo- motoras y la inteligencia según el Modelo Español de reconocimiento de conductores. Material y Métodos, mediante la observación de variables analizadas en las normativas aplicadas desde que se inicia la locomoción en España y los protocolos actuales de valoración recomendados por la Dirección General de Tráfico y El Ministerio de Sanidad. Conclusiones, las variables consideradas han servido a los modelos preventivos de cada época, actualmente pretenden atender a las necesidades de prevención de los hábitos sociales actuales. Los aspectos valorados, apenas han sufrido variaciones, en los últimos añ…
Macro-elements in the mixed boundary value problems
2000
The symmetric Galerkin boundary element method (SGBEM), applied to elastostatic problems, is employed in defining a model with BE macro-elements. The model is governed by symmetric operators and it is characterized by a small number of independent variables upon the interface between the macro-elements.
The European sovereign debt market: from integration to segmentation
2013
This paper investigates the impact of European Monetary Union (EMU) and of the recent financial and fiscal crisis on the integration of the European sovereign debt market using annual data 1992–2010. The panel regression dependent variable is time-varying market linkages computed from daily realised correlations between sovereign bond returns for 13 European economies and Germany. The results indicate that the elimination of currency risk following the implementation of EMU led to a fundamental and significant one-off increase in integration. The net impact of fiscal fundamentals was negligible up until 2009 as the markets seemed to be pricing in a potential bailout for member states in cri…
Higher education and the development of competencies for innovation in the workplace
2012
PurposeThis paper aims to analyze the production function nexus between higher education practice and the development of innovation‐related competencies by university graduates in Spain. The research hypothesis is the presence of statistically significant relationships between the development of innovational competencies and the modes of teaching and learning used in higher education practice.Design/methodology/approachThe relationships are modeled through a set of stochastic frontier and variance component equations with the development of each competency as the dependent variable. The main explanatory variables capture the prevalence of diverse teaching/learning modes and the behavior of …
Regional gender inequality in the Norwegian culture of equality
2014
Published version of an article in the journal: Gender Issues. Also available from the publisher at: http://dx.doi.org/10.1007/s12147-014-9131-0 This research project has its origin in statistical findings indicating that there has been a long-standing regional variation in the attainment of gender equality in Norway whereby the southern region has been identified as the least gender-equal. This is likely to be caused by an interaction of economic, political and cultural structures. Nevertheless, the understanding of this phenomenon remains incomplete since the cultural dimension too often ends up as a residual category or a dependent variable. The project seeks to explore the cultural dime…
INTER-ORGANIZATIONAL INNOVATION PROMOTERS IN SMALL, KNOWLEDGE-INTENSIVE FIRMS
2009
This paper examines the relationship between external relations and innovation in small, knowledge-intensive Norwegian firms. Our findings indicate that external relations are beneficial for innovation. The analysis shows that it is necessary to treat innovation as more than a concept. Our independent variables related differently to product innovation, process innovation, and market innovation.We found that market participation in product development has a positive impact on product, process and market innovation. We also found that top management interaction with other firms had a positive effect on market innovation and that top management interaction with external R&D had a positive…
Breaking Stereotypes Concerning Remigrated Children - A Multinational Possible Intervention Plan through School
2021
The article is based on a multinational study involving five countries (Romania, Portugal, Italy, North Macedonia, and Iceland) facing the return migration or remigration situation. Pupils (n = 1615), teachers (n = 370), future teachers (n = 166) and youth workers (n = 30) were questioned about various aspects regarding the subject. Among the matters, cultural needs appear to the most important. Based on the statistical analysis, the article describes the dynamics of the dependent variables, with highlighted interest on cultural needs. Psychological and social needs, cultural needs, and educational needs are discussed and link conclusions appear. Following the analysis, an intervention plan…