Sökning: "Modulation Transfer Function"

Visar resultat 16 - 20 av 41 avhandlingar innehållade orden Modulation Transfer Function.

1. 16. Digital intraoral radiography : determination of technical properties and application evaluations

   Författare :Ann-Catherine Mörner-Svalling; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :;

   Sammanfattning : Digital registration of intraoral radiographs was introduced about 1990. One of the first systems on the market was the Sens-A-Ray (Regain Medical Systems AB, Sundsvall, Sweden). At the time of the introduction, it was deemed important to determine basic technical properties for this system. LÄS MER

3. 17. Serotonin in emotional memory processes : neuropharmacological studies with emphasis on depression

   Författare :Therese M Eriksson; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :;

   Sammanfattning : Cognitive dysfunctions are common in neuropsychiatric disorders including Major Depressive Disorder, but are difficult to normalize by antidepressant therapies and contribute to reduced functional improvement. Cognitive impairments include alterations of emotional memory processes that are early targeted by antidepressant therapies, including Selective Serotonin Reuptake Inhibitors (SSRIs). LÄS MER

4. 18. Intrinsic tunneling spectroscopic investigations of Bi2Sr2CaCu2O8+x superconductors : The fluxon lattice, resonant phenomena,flux-flow and current doping

   Författare :Holger Motzkau; Vladimir M. Krasnov; Paul Müller; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : In this thesis, the tunneling between individual atomic layers in structures of Bi2Sr2CaCu2O8+x based high-temperature superconductors are experimentally studied employing the intrinsic Josephson effect. A special attention is paid on the fabrication of small mesa structures using micro and nanofabrication techniques. LÄS MER

5. 19. The role of polysaccharide modifications during Drosophila development

   Författare :Florian Lüders; Institutionen för experimentell medicinsk vetenskap; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; ontogeni; growth animal ; embryologi; Development biology; Decapentaplegic; Hedgehog; Wingless; Sulfation; Pipe; Glycosaminoglycan; Glycosyltransferase; ontogeny; embryology; Utvecklingsbiologi;

   Sammanfattning : Glucosides attached to proteins and lipids have been shown to modulate the activity of signal transduction pathways regulating growth and patterning processes during animal development. In particular, O-linked glycans such as glycosaminoglycans (GAGs) have been implicated in modulation of growth factor signaling pathways. LÄS MER

7. 20. On High-Speed Digital-to-Analog Converters and Semi-Digital FIR Filters

   Författare :Mohammad Reza Sadeghifar; J Jacob Wikner; Robert Hägglund; Linköpings universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; DAC; RFDAC; SDFIR; FIR; semi-digital FIR filter; digital-to-analog converter; D A converter; data converter; mixed-signal integrated circuits; mixer DAC; IQ modulator; transmitter;

   Sammanfattning : High-speed and high-resolution digital-to-analog converters (DACs) are vital components in all telecommunication systems. Radio-frequency digital-to-analog converter (RFDAC) provides high-speed and high-resolution conversion from digital domain to an analog signal. RFDACs can be employed in direct-conversion radio transmitter architectures. LÄS MER