Patrones de actividad cotidiana en personas mayores: ¿es lo que dicen hacer lo que desearían hacer?

El objetivo del presente artículo es explorar el patrón de actividades cotidianas y deseadas en una muestra de personas mayores, así como algunos factores que las condicionan y sus implicaciones para la satisfacción con la vida. Una muestra de 154 personas jubiladas de más de 60 años y que vivían en un entorno urbano participó en el estudio. Los datos sobre las actividades se recogieron mediante entrevistas individuales, mientras que para la satisfacción con la vida se utilizó la escala LSI. Nuestros resultados muestran que el patrón de actividades manifestadas para el día de ayer es muy similar al que se realizaría en un día ideal, aunque en éste se desearía pasar mucho más tiempo en compañía de otras personas. Factores como el sexo y el nivel educativo y económico afectan a las actividades realizadas, especialmente a las instrumentales y al tiempo dedicado al ocio. La diferencia entre el día de ayer y el día ideal se relacionó negativamente y de manera significativa, aunque modesta, con la satisfacción con la vida

Electron-microscope studies on relapsing fever spirochaetes

In December 1945, Lofgren &amp; Soule described the structure ofSpirochaeta novyi,as revealed by the electron microscope but, owing to the present emergency conditions, this work has only now come to our knowledge.</jats:p

Electrical characterization of CMOS transistors subject to externally applied mechanical stress

Hole and electron mobilities in CMOS structures are significantly influenced by a mechanical strain state. In the present work a new experimental device has been designed, able to apply a uniaxial in-plane strain along different crystallographic orientations. A hole mobility enhancement of +10% and an electron mobility decrease of -5% have been demonstrated with the application of a 0.05% compressive strain; a hole mobility enhancement of +2% and an electron mobility decrease of -3% have been induced into the material with the application of a 0.05% compressive strain

Model-driven performance prediction of HLA-based distributed simulation systems

Performance models offer a convenient tool to assess design alternatives and predict the execution time of distributed simulation (DS) systems at design time, before system implementation. Currently, performance models are to be manually developed and the related extra effort often becomes the limiting factor for their cost- and time-effective use. In this paper, we aim to reduce this extra effort with the introduction of a model-driven method for the automated building of performance models whose evaluation provides a prediction about of the execution time of a distributed simulation system. As such, the method contributes to bring software performance engineering techniques into the distributed simulation system lifecycle. In particular, we show how the SysML-based specification of the system to be simulated and the design documents of the DS system can be used to derive the topology and the parameters of a performance model specified according to the Extended Queueing Network formalism

Temporal capabilities in support of conceptual process modeling using object-role modeling

Conceptual data modeling languages must be provided with temporal capabilities to support the data evolution throughout the execution of a conceptual process model. Asides from supporting the storage of historical data, temporal capabilities must also provide the means for verifying the consistency between the data temporal properties and the data modification resulting from the process execution. The Object-Role Modeling (ORM) language is a conceptual data modeling language that is based on the concepts of Fact (i.e. true statements on the represented world), Fact Type, and Fact Base (i.e. the set of all the Facts). Currently, the ORM language does not address the specification of Facts temporal properties, and therefore does not also support the verification of Facts variations during a process execution. The paper introduces an initial ORM overlay methodology that aims to laying the foundation of the conceptual modeling structures that can support the verification of temporal evolution of conceptual data models (i.e., whether a Fact can be asserted or retracted, depending on its temporal properties). Moreover, the overlay methodology also defines a temporal visual notation and an initial semi-formal temporal verbalization that eases the use of the methodology to the ORM modelers. A simple example illustrates the potential application of the overlay methodology

Temporal capabilities in support of conceptual process modeling using object-role modeling

Conceptual data modeling languages must be provided with temporal capabilities to support the data evolution throughout the execution of a conceptual process model. Asides from supporting the storage of historical data, temporal capabilities must also provide the means for verifying the consistency between the data temporal properties and the data modification resulting from the process execution. The Object-Role Modeling (ORM) language is a conceptual data modeling language that is based on the concepts of Fact (i.e. true statements on the represented world), Fact Type, and Fact Base (i.e. the set of all the Facts). Currently, the ORM language does not address the specification of Facts temporal properties, and therefore does not also support the verification of Facts variations during a process execution. The paper introduces an initial ORM overlay methodology that aims to laying the foundation of the conceptual modeling structures that can support the verification of temporal evolution of conceptual data models (i.e., whether a Fact can be asserted or retracted, depending on its temporal properties). Moreover, the overlay methodology also defines a temporal visual notation and an initial semi-formal temporal verbalization that eases the use of the methodology to the ORM modelers. A simple example illustrates the potential application of the overlay methodology