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Visar resultat 1 - 5 av 15 avhandlingar som matchar ovanstående sökkriterier.

1. 1. Direct and Inverse Scattering of Electromagnetic Waves in Nonlinear Media

   Författare :Daniel Sjöberg; Institutionen för elektro- och informationsteknik; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Sammanfattning : Models for materials with nonlinear electromagnetic response are examined. Three simple physical causes for nonlinear behavior are presented: electronic polarization, molecular direction and electrostriction. LÄS MER

3. 2. Transient Electromagnetic Waves in Nonlinear Media

   Författare :Daniel Sjöberg; Institutionen för elektro- och informationsteknik; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Signal processing; nonlinear materials; Electromagnetic waves; instantaneous response; waveguides; shock waves; entropy condition; Elektronik och elektroteknik; Electronics and Electrical technology; Signalbehandling; Electromagnetism; optics; acoustics; Elektromagnetism; optik; akustik;

   Sammanfattning : This thesis is concerned with the propagation of transient electromagnetic waves in nonlinear media. It consists of a General Introduction and five scientific papers. The General Introduction gives a broad overview of nonlinear electromagnetic phenomena. LÄS MER

4. 3. The Inflammatory Bowel Disease Cohort of the Uppsala Region (ICURE) : Epidemiology and Complications

   Författare :Daniel Sjöberg; Anders Rönnblom; Olof Grip; Uppsala universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; inflammatory bowel disease; ulcerative colitis; Crohn s disease; epidemiology; incidence; colectomy; anaemia; complications; surgery; classification;

   Sammanfattning : The overall aims of this thesis were to investigate the incidence of inflammatory bowel disease in the Uppsala Region of Sweden, to study the clinical course and the impact of the disease with regards to complications.Patients in Uppsala County were included in the study from the 1st of January 2005 and patients in Falun, Eskilstuna and Åland counties from the 1st of January 2007. LÄS MER

5. 4. Managing and Exploring Large Data Sets Generated by Liquid Separation - Mass Spectrometry

   Författare :Daniel Bäckström; Per Sjöberg; Rolf Danielsson; Thomas Moritz; Uppsala universitet; []
   Nyckelord :Analytical chemistry; liquid chromatography; capillary electrophoresis; capillary electrochromatography; mass spectrometry; electro spray ionization; chemometrics; multivariate data analysis; peptide; biomarkers; fingerprints; PCA; alignment; data compression; ANOVA; target correlation; data management; Analytisk kemi;

   Sammanfattning : A trend in natural science and especially in analytical chemistry is the increasing need for analysis of a large number of complex samples with low analyte concentrations. Biological samples (urine, blood, plasma, cerebral spinal fluid, tissue etc. LÄS MER

7. 5. The evolution of ribonucleotide reductases

   Författare :Daniel Lundin; Anthony Poole; Britt-Marie Sjöberg; Christos Ouzounis; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Evolution; ribonucleotide reductase; horizontal gene transfer; phylogeny; protein classification; Molecular biology; Molekylärbiologi; Molecular Biology; molekylärbiologi;

   Sammanfattning : Ribonucleotide reductase (RNR) catalyses the transformation of RNA building blocks, ribonucleotides, to DNA building blocks, deoxyribonucleotides. This is the only extant reaction pathway for de novo synthesis of DNA building blocks and the enzyme is thus necessary for life. RNR is found in all but a few organisms. LÄS MER