Sökning: "Time dependence"

Visar resultat 1 - 5 av 738 avhandlingar innehållade orden Time dependence.

1. 1. Real-Time Time Metrology Using Space Geodetic Methods

   Författare :Carsten Rieck; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; VLBI; Time metrology; UTC; TAI; time link combination; carrier phase; time transfer; real-time filtering; GNSS;

   Sammanfattning : Two main objectives in time and frequency metrology are the realization of the SI unit of time, and the construction and dissemination of atomic time scales based on the SI second. This thesis is mainly concerned with the latter of the two and has investigated the characteristics of space geodetic time and frequency comparison methods. LÄS MER

3. 2. Constructivism, Essentialism, and the Between : Human Being and Vulnerability in Judith Butler, Steven Pinker and Colin Gunton

   Författare :Joseph Sverker; Mattias Martinson; Katarina Westerlund; Stephen R. Holmes; Uppsala universitet; []
   Nyckelord :HUMANIORA; HUMANITIES; HUMANIORA; HUMANITIES; Judith Butler; Steven Pinker; Colin Gunton; theological anthropology; social constructivism; social constructionism; biologism; essentialism; biologist essentialism; evolution; school; differentiation; christology; doctrine of the Trinity; interpellation; evolutionary psychology; nature nurture; vulnerability; body; individual; person; individualism; personalism; kenosis; self-giving; recognition; feminism; relational ontology; weak ontology; relations; relationality; time; freedom; performativity; culture; environment; dependence; independence; Systematisk teologi med livsåskådningsforskning; Systematic Theology and Studies in Worldviews;

   Sammanfattning : This dissertation explores the division between biology and the social by means of Christian theology. The question is approached by reading and interacting critical theorist Judith Butler, psycholinguist Steven Pinker and theologian Colin Gunton.With Gunton the author argues that a relational, but ‘weak’, ontology is needed. LÄS MER

4. 3. Reward-related genes and alcohol dependence

   Författare :Sara Landgren; Göteborgs universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; alcohol; dependence; reward; smoking; body weight; gene; polymorphism; nAChR; ghrelin; GHS-R1A;

   Sammanfattning : Introduction: The rewarding properties of alcohol are mediated by the brain reward systems, specifically by the cholinergic-dopaminergic reward link, involving both nicotinic acetylcholine receptors (nAChRs) as well as the ghrelin signalling system. The susceptibility for developing alcohol dependence is influenced by genetic factors. LÄS MER

5. 4. Gadodiamide injection for Enhancement of MRI in the CNS. Applications, dose, field and time dependence

   Författare :Per Åkeson; Malmö Diagnostisk radiologi; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Clinical physics; Phantom study.; Comparative study; Human; Time dependence; Dosage; Enhancement; Gadolinium; MRI contrast media; Contrast media; Magnetic resonance imaging; Spine; Brain neoplasms; secondary; Brain; radiology; tomography; medical instrumentation; Klinisk fysiologi; radiologi; tomografi; medicinsk instrumentering;

   Sammanfattning : Aims of the study The aims of this study using Gadodiamide injection were to investigate: · Whether Gadodiamide injection was comparable to Gd-DTPA for the enhancement of CNS lesions. · The contrast effect at different field strengths. · The effective time-window for the enhancement of blood-brain barrier damage. LÄS MER

7. 5. Security of Time Synchronization for PMU-based Power System State Estimation: Vulnerabilities and Countermeasures

   Författare :Ezzeldin Shereen; György Dán; Joe H. Chow; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Phasor measurements unit; Time synchronization; Power system state estimation; Network Security; Time synchronization attacks; Precision time protocol; Machine learning; Electrical Engineering; Elektro- och systemteknik;

   Sammanfattning : Phasor Measurement Units (PMUs) constitute an emerging technology that is essential for various smart grid applications such as phase angle monitoring, power oscillation damping, fault localization, and linear state estimation. To obtain precise PMU measurements of voltage and current phasors, time synchronization in the order of 1 microsecond is typically required. LÄS MER