Sökning: "cheng a"
Visar resultat 1 - 5 av 61 avhandlingar innehållade orden cheng a.
1. Factors modifying cellular response to ionizing radiation
Sammanfattning : Many physical factors influence the biological effect of exposure to ionizing radiation, including radiation quality, dose rate and temperature. This thesis focuses on how these factors influence the outcome of exposure and the mechanisms behind the cellular response. LÄS MER
2. Online trajectory planning and observer based control
Sammanfattning : The main body of this thesis consists of four appended papers. The first two consider different aspects of the trajectory planning problem, while the last two deal with observer design for mobile robotic and Euler-Lagrange systems respectively. LÄS MER
3. A Segmented Silicon Strip Detector for Photon-Counting Spectral Computed Tomography
Sammanfattning : Spectral computed tomography with energy-resolving detectors has a potential to improve the detectability of images and correspondingly reduce the radiation dose to patients by extracting and properly using the energy information in the broad x-ray spectrum. A silicon photon-counting detector has been developed for spectral CT and it has successfully solved the problem of high photon flux in clinical CT applications by adopting the segmented detector structure and operating the detector in edge-on geometry. LÄS MER
4. Community involvement & ecomuseums : towards a mutual approach to ecomuseology and landscape studies
Sammanfattning : Ecomuseums are museums for, by, and about people at home in their own environment (Keyes, 1992). Since their establishment in 1971, community involvement has been a defining characteristic of ecomuseums. Such community involvement does not just preserve artefacts, but also protects and creates its own physical environment in the form of landscape. LÄS MER
5. Ultrafast Photoionization Dynamics Studied with Coincidence Momentum Imaging Spectrometers
Sammanfattning : The time scale of the dynamics in atoms and molecules varies from attoseconds (10-18) to picoseconds (10-12) depending on the size of the particles. To study such dynamics, ultrafast light pulses are needed to trigger and capture the reaction. One of the most direct methods consists in ionizing the system and observing the following response. LÄS MER