Sökning: "neutrons"

Visar resultat 1 - 5 av 114 avhandlingar innehållade ordet neutrons.

  1. 1. Collective Structure of Neutron-Rich Rare-Earth Nuclei and Development of Instrumentation for Gamma-Ray Spectroscopy

    Författare :Pär-Anders Söderström; Johan Nyberg; Ayşe Ataç; John Simpson; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; nuclear structure; collective models; 150 < A < 189; AGATA; HPGe detectors; gamma-ray tracking; NEDA; pulse-shape discrimination; neutrons; neural network; Nuclear physics; Kärnfysik; Physics with specialization in Nuclear Physics; Fysik med inriktning mot kärnfysik;

    Sammanfattning : Neutron-rich rare-earth nuclei are among the most collective nuclei that can be found in nature. In particular, the doubly mid-shell nucleus 170Dy is expected to be the nucleus where the collective structure is maximized. LÄS MER

  3. 2. Combining low resolution, high resolution, functional, and simulation techniques : In the study of pentameric ligand-gated ion channels

    Författare :Marie Lycksell; Erik Lindahl; Kresten Lindorff-Larsen; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Neutrons; Small-angle scattering; Cryo-EM; Simulations; Ion channels; Biophysics; biofysik;

    Sammanfattning : Combining methods yielding different information is a powerful approach for understanding structural biology in general, and in particular systems such as pentameric ligand-gated ion channels (pLGICs). Pentameric ligand-gated ion channels are membrane proteins that sense chemical signals, which they convert to changes in membrane potential. LÄS MER

  4. 3. Anisotropic Mechanical Behaviours and Thin-wall Effects of Additively Manufactured Austenitic Alloys

    Författare :Cheng-Han Yu; Johan Moverare; Ru Lin Peng; Christian Leinenbach; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Laser powder bed fusion; Slow strain rate tensile testing; Short-term creep; Low cycle fatigue; Neutrons; Anisotropy; Crystallographic texture; Microstruc-ture; Dislocation structure; Lasersmältning i pulverbädd; Provning med långsam töjningshastighet; korttidskryp; Lågcykelutmattning; Neutroner; Anisotropi; Kristallografisk textur; Mikrostruktur; Dislokationsstruktur;

    Sammanfattning : Additive manufacturing (AM), also known as 3D printing, is a general concept of building a three-dimensional object layer-by-layer. AM breaks through the manufacturing limitations in conventionally subtractive manufacturing, leading to a great design freedom of components with complex geometries. LÄS MER

  5. 4. Determination of absorbed dose in fields of fast neutrons

    Författare :Anders Montelius; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Neutron dosimetry; finite volumes; interface effects; marrow dose; chord length distributions;

    Sammanfattning : Analytical models have been developed to solve energy deposition problems in finite detectors and near interfaces in beams of fast neutrons. Dose expressions have been derived, which are suitable for numerical evaluation. The detectors or volumes of interest have been characterized by distributions of chord length along which the particles travel. LÄS MER

  7. 5. Neutron Irradiation Techniques

    Författare :Julius Scherzinger; Kärnfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; actinide Be; fast-neutrons; NE-213 liquid scintillator; He-4 scintillators; pulse-shape discrimination; Cf-252; absolute detection efficiency; neutron irradiation; Fysicumarkivet A:2016:Scherzinger;

    Sammanfattning : The He-3 “crisis” has become a fact in the last decade and large scale neutron detectors based on He-3 technologies have become unaffordable. This new He-3 reality has resulted in a major effort worldwide to develop replacement neutron-detector technologies. LÄS MER