Sökning: "variable"

Visar resultat 11 - 15 av 2267 avhandlingar innehållade ordet variable.

  1. 11. Latent variable models for longitudinal twin data

    Författare :Annica Dominicus; Juni Palmgren; Nancy L. Pedersen; Michael G. Kenward; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Latent variable models; twin models; variance components; change point models; non-ignorable nonresponse; likelihood ratio tests; Mathematical statistics; Matematisk statistik;

    Sammanfattning : Longitudinal twin data provide important information for exploring sources of variation in human traits. In statistical models for twin data, unobserved genetic and environmental factors influencing the trait are represented by latent variables. In this way, trait variation can be decomposed into genetic and environmental components. LÄS MER

  3. 12. Speech coding from a variable rate perspective

    Författare :Thomas Eriksson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; CELP; variable rate coding; speech coding;

    Sammanfattning : .... LÄS MER

  4. 13. Matematisk och pedagogisk kunskap – Lärarstudenters uppfattningar av begreppen funktion och variabel

    Författare :Mikael Borke; Göteborgs universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; function; variable; student teacher; concept definition; concept image; conception; mathematical knowledge for teaching; function;

    Sammanfattning : The concepts of function and variable are important in compulsory and upper secondary schools, and at the university. Teachers' mathematical knowledge, as well as their pedagogical knowledge, have an effect on their teaching. LÄS MER

  5. 14. Stability and boundedness results for variable-step variable-formula methods

    Författare :Jørgen Sand; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : This work constitutes the author's Doctoral thesis, which includes an introduction to and a summary of the following two TRITA-NA-reports: 8112 and 8218.In many practical applications one is interested in step-wise simulation of the behaviour of a dynamic system described by ordinary differential equations. LÄS MER

  7. 15. Análisis dinámico de un eje de ferrocarril con capacidad de cambio de ancho automático

    Författare :Carlos Casanueva; José Germán Giménez; Asier Alonso; Javier Gil Sevillano; Jordi Vinolas; Jesús M. Busturia; Xabier Pérez; Eduardo Gómez; University of Navarra CEIT and Tecnun; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; variable gauge wheelset; railway dynamics; ; eje de ancho variable; dinámica ferroviaria; Järnvägsgruppen - Fordonsteknik; Järnvägsgruppen - Fordonsteknik;

    Sammanfattning : El objetivo de la presente tesis es la mejora de los actuales ejes de ancho variable para su circulación por vías de alta velocidad (AV) a velocidades de hasta 300km/h. En la actualidad los vehículos con ejes de ancho variable no sobrepasan los 250km/h de velocidad de servicio en vías de AV, lo que supone un claro desaprovechamiento de recursos y dificultades de gestión del tráfico para el gestor de la infraestructura a causa de las distintas velocidades punta de los diferentes trenes. LÄS MER