Sökning: "resonance states"

Visar resultat 16 - 20 av 159 avhandlingar innehållade orden resonance states.

  1. 16. Theoretical and Numerical Studies of Efimov States

    Författare :Kajsa-My Blomdahl; Svante Jonsell; Michael Odelius; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; teoretisk fysik; Theoretical Physics;

    Sammanfattning : In contrast to the classical case, the quantum three-body problem is amenable to qualitative analysis and, in some cases, even to analytic solutions. In 1970, Vitaly Efimov predicted that resonant two-body forces could give rise to a series of bound energy levels in three-particle systems. LÄS MER

  3. 17. Deep Regression and Segmentation for Medical Inference from Large-Scale Magnetic Resonance Imaging

    Författare :Taro Langner; Joel Kullberg; Anders Eklund; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Magnetic resonance imaging; medical image analysis; neural networks; machine learning; semantic segmentation; deep regression; saliency analysis; uncertainty quantification; UK Biobank; Medical Informatics; Medicinsk informatik;

    Sammanfattning : Large-scale studies, such as UK Biobank, acquire medical imaging data for thousands of participants. With magnetic resonance imaging (MRI), comprehensive representations of human anatomy can be provided for non-invasive assessments of health-related conditions, body composition, organ volumes, and more. LÄS MER

  4. 18. Photodetachment of Negative Ions. Experimental Investigations of Threshold and Continuum Structures

    Författare :Joakim Sandström; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; electron correlation; resonance ionization spectroscopy; doubly excited states; electron affinity; accelerator mass spectrometry; photodetachment;

    Sammanfattning : In this thesis photodetachment studies of atomic negative ions where one or several electrons are detached from a negative ion are presented. Negative ions are unique objects since their formation and destruction mechanisms strongly depend on the correlated motion of the valence electrons. LÄS MER

  5. 19. The Effect of Steroid Hormones in the Female Brain During Different Reproductive States

    Författare :Elin Bannbers; Inger Sundström-Poromaa; Johan Wikström; Kristiina Kask; Eriksson Elias; Uppsala universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Premenstrual dysphoric disorder; Postpartum; Estradiol; Progesterone; Menstrual cycle; Functional magnetic resonance imaging; Response inhibition; Prepulse inhibition; Startle response; Medicinsk vetenskap; Medical Science;

    Sammanfattning : Women are twice as likely as men to suffer from depression and anxiety disorders and have an increased risk of onset during periods associated with hormonal changes, such as the postpartum period and the menopausal transition. Furthermore, some women seem more sensitive to normal hormone fluctuations across the menstrual cycle, since approximately 3-5% suffers from premenstrual dysphoric disorder (PMDD). LÄS MER

  7. 20. Analysis and development of strategies for magnetic resonance functional neuroimaging

    Författare :Peter Fransson; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :neuroimaging; human brain; functional activation; magnetic resonance imaging; cerebral blood oxygenation;

    Sammanfattning : This thesis focuses on strategies for oxygenation-sensitive MRI that are designed to measure alterations in brain physiology induced by changes in neuronal activity. In a first study, it was shown that the temporal evolution of BOLD MRI signal changes in response to both brief and sustained visual activation are equally well visible in FLASH and EPI recordings. LÄS MER