Sökning: "GIC"

Visar resultat 1 - 5 av 14 avhandlingar innehållade ordet GIC.

1. 1. Model Selection and Sparse Modeling

   Författare :Yngve Selén; Peter Stoica; Jean-Jacques Fuchs; Uppsala universitet; []
   Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; model selection; model order selection; model averaging; nested models; sparse models; Bayesian inference; MMSE estimation; MAP estimation; ML estimation; AIC; BIC; GIC; RAKE receivers; pulse compression; radar; linear models; linear regression models; Signal processing; Signalbehandling;

   Sammanfattning : Parametric signal models are used in a multitude of signal processing applications. This thesis deals with signals for which there are many candidate models, and it is not a priori known which model is the most appropriate one. LÄS MER

3. 2. Electromagnetic Modelling of Power Transformers for Study and Mitigation of Effects of GICs

   Författare :Seyedali Mousavi; Göran Engdahl; Ebrahim Rahimpour; KTH; []
   Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; transformer; hysteresis; DC magnetization; GMD; GICs; FEM; reluctance network method; low frequency transients; core losses; winding losses; eddy current losses; transformator; hysteresis; DC; likströmsmagnetisering; GMD; GIC; FEM; reluktansnätverksmodell; lågfrekventa transienter; kärnförluster; lindningsförluster; virvelströmsförluster; Electrical Engineering; Elektro- och systemteknik;

   Sammanfattning : Geomagnetic disturbances that result from solar activities can affect technological systems such as power networks. They may cause DC currents in power networks and saturation of the core in power transformers that leads to destruction in the transformer performance. LÄS MER

4. 3. Glass Ionomer Cements with Improved Bioactive and Antibacterial Properties

   Författare :Song Chen; Håkan Engqvist; Wei Xia; Jie Zhou; Uppsala universitet; []
   Nyckelord :MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; biomaterial; glass ionomer cement; bioactivity; hydroxyapatite; monetite; calcium silicate;

   Sammanfattning : Dental restorative cements are placed in a harsh oral environment where they are subjected to thermal shock, chemical degradation, and repeating masticatory force. The ideal restorative dental cements should have superior mechanical properties, chemical stability, aesthetic, good handling properties, biocompatibility, antibacterial properties, and preferably bioactivity. LÄS MER

5. 4. The oncogenic role of histone chaperone ASF1 proteins in solid tumors

   Författare :Yujiao Wu; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :;

   Sammanfattning : Chromatin is the essential medium connecting regulatory signals such as transcription factors and signaling pathways to the alteration of gene activity and cellular phenotypes. Aberrant chromatin (epigenetic) environment plays an important role in carcinogenesis. LÄS MER

7. 5. Health, migration and quality of life among Kurdish immigrants in Sweden

   Författare :Marina Taloyan; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :Immigrants; Kurds; ethnicity; self-reported health; psychological distress; psychological well-being; coping strategies; quantitative; qualitative; Sweden;

   Sammanfattning : Background: Although immigrants generally have poorer health and higher psychological distress than the native population, information on health, migration and quality of life among Kurdish immigrants is limited. Aims: Study I, to explore the association between (i) ethnicity and self-reported health (SRH) and (ii) complaints of psychological distress. LÄS MER