Sökning: "invariance"

Visar resultat 11 - 15 av 90 avhandlingar innehållade ordet invariance.

  1. 11. Numerical Investigation of Turbulent Fluid Flow and Heat Transfer in Complex Ducts

    Författare :Masoud Rokni; Värmeöverföring; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; SED; WET; GGDH; RNG; RSM; EASM; Low-Reynolds; Non-linear k-e; Heat transfer; Turbulent; Complex ducts; Secondary flows; Temperature invariance; Energy research; Energiforskning;

    Sammanfattning : Th need for a reliable and reasonable accurate turbulence model without specific convergence problem for calculating duct flows in industrial applications has become more evident. In this study a general computational method has been developed for calculating turbulent quantities in any arbitrary three dimensional duct. LÄS MER

  3. 12. Adolescent mental health : time trends and validity of self-report measures

    Författare :Ida Blomqvist; Eva Henje; Inga Dennhag; Anne Hammarström; Lotte Haverman; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Adolescent; classical test theory; computer adaptive testing; cross-sectional; differential item functioning; graded response model; item banks; item response theory; measurement invariance; mental health; Patient-Reported Outcomes Measurement Information System; Reynolds Adolescent Depression Scale second edition; self-report measures; time trends; barn- och ungdomspsykiatri; Child and Youth Psychiatry;

    Sammanfattning : Background: Studies of time trends of adolescent self-reported mental health suggest an increase of mental health symptoms globally. Unfortunately, several studies within the field have methodological problems, such as short time-period between measurements and different mental health measures over time. LÄS MER

  4. 13. Control and Communication-Schedule Co-design For Networked Control Systems

    Författare :Masoud Bahraini; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Model Predictive Control; Networked Control Systems; Robust Invariance; Communication Scheduling;

    Sammanfattning : In a networked control system (NCS), the control loop is closed through a communication medium. This means that sensor measurements and/or control signals can be exchanged through a communication link. LÄS MER

  5. 14. Depression in teenagers and young adults : foundational studies of the new treatment paradigm TARA: Training for Awareness, Resilience, and Action

    Författare :Erik Ekbäck; Eva Henje Blom; Ida Blomqvist; Jenny Molin; Inga Dennhag; Thorbjörn Lundberg; Elizabeth McCauley; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Depression; adolescents; young adults; medical students; mental health; anxiety; psychological stress; qualitative research; randomization; yoga; mindfulness; psychotherapy; antidepressant drugs; biomarkers; clinical trial; feasibility studies; online intervention; reliability; validity; confirmatory factor analysis; measurement invariance; barn- och ungdomspsykiatri; Child and Youth Psychiatry;

    Sammanfattning : Introduction: Depression in adolescents and young adults is an increasing global health concern and available treatments are not convincingly effective. It is therefore important to develop and test novel treatments to improve treatment outcomes. LÄS MER

  7. 15. Towards Fully Automatic Optimal Shape Modeling

    Författare :Johan Karlsson; Matematik LTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Parameterization Invariance; Benchmarking; Interpretation; Segmentation; Alignment; Shape Modeling; MDL;

    Sammanfattning : Shape models and the automatic building of such models have proven over the last decades to be powerful tools in image segmentation and analysis. This thesis makes contributions to this field. The segmentation algorithm typically uses an objective function summing up contributions from each sample point. LÄS MER