Sökning: "lifetime measurements"

Visar resultat 1 - 5 av 170 avhandlingar innehållade orden lifetime measurements.

  1. 1. Studies of collective phenomena in neutron deficient nuclei : by means of lifetime measurements, angular correlation measurements and the recoil-decay tagging technique

    Författare :Karin Andgren; Bo Cederwall; Paul Nolan; KTH; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; heavy-ion reactions; multi-detector arrays; recoil separator; in-beam gamma-ray spectroscopy; high spin states; lifetime measurements; recoil-decay tagging; nuclear shape; Nuclear physics; Kärnfysik;

    Sammanfattning : The nucleus is a mesoscopic system that retains features from both the quantum and macroscopic worlds. A basic property of a macroscopic body is its shape. Nuclear shapes can be deduced from experimental data as they influence the excitation mode of the nucleus and hence the energies and lifetimes of its excited levels. LÄS MER

  2. 2. Lifetime Measurements of Excited States in the Semi-Magic Nucleus 94Ru

    Författare :Aysegul Ertoprak; Bo Cederwall; Magdalena Zielinska; KTH; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; nuclear structure; lifetime measurements; doppler shift attenuation method; thick target; Physics; Fysik;

    Sammanfattning : Lifetimes of highly excited states in the semi-magic (N=50) nucleus 94Ru were deduced from an analysis of the Doppler broadened transition line shapes. Excited states in 94Ru were populated in the 58Ni(40Ca, 4p)94Ru∗ fusion-evaporation reaction at the Grand Accélérateur National d’Ions Lourds (GANIL) accelerator complex situated in Caen, France. LÄS MER

  3. 3. Lifetime modeling and management of transformers

    Författare :Johanna Rosenlind; Rajeev Thottappillill; Zhong Dong Wang; KTH; []
    Nyckelord :transformers; lifetime modeling; asset management; thermal modeling; lifetime estimation;

    Sammanfattning : This work have studied and developed lifetime estimation methods for the power transformer and how these could be used for asset management purposes. It is researchperformed in the intersection of the fields of reliability theory, statistical analysis, and stochastic process theory applied to lifetime estimations and management of transformers. LÄS MER

  4. 4. Removal of ultrafine particles by intermediate air filters in ventilation systems. Evaluation of performance and analysis of applications

    Författare :Bingbing Shi; Chalmers University of Technology; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; measurements; ultrafine particles; lifetime cost; indoor air quality; health effect; air cleaning; particle source; modelling; intermediate filter; filter standard;

    Sammanfattning : Epidemiological and toxicological studies demonstrate that ultrafine particles (UFPs) are strongly related with respiratory and cardiovascular diseases and syndromes. One common method to reduce human exposure to particulate air pollution is the use of intermediate class filters (F5-F9 class filters according to EN779:2002). LÄS MER

  5. 5. Investigation of Nuclear Materials with Positron Measurements

    Författare :Petty Bernitt Cartemo; Chalmers University of Technology; []
    Nyckelord :depth profiling; positron beam; nuclear materials; radiation damage; positron lifetime measurements;

    Sammanfattning : Positron Annihilation Lifetime Spectroscopy can be used to characterize radia- tion-induced material defects to subsequently optimize nuclear materials with respect to radiation damage. Nuclear Systems of the future such as Generation IV and fusion concepts demand high performance from structural materials, comprising a material's stability in highly-radiative and hot environments. LÄS MER