Sökning: "helium measurements"
Visar resultat 1 - 5 av 30 avhandlingar innehållade orden helium measurements.
1. Helium measuring system for on-line fuel and control rod integrity surveillance in BWRs
Sammanfattning : Accurate supervision of fuel and control rod integrity in a nuclear reactor core is very important for maintaining a safe and reliable operation of the reactor. Fuel rod failures can cause increased doses to personnel in the power plant, increased backend costs, limitations of the reactor operation and unplanned shut downs, which can lead to large economic losses. LÄS MER
2. Double Excitations in Helium Atoms and Lithium Compounds
Sammanfattning : This thesis addresses the investigation of doubly excited 2l´nl states in helium atoms and double core excitations in solid lithium compounds.Measurements on He are made in field free environments and under the influence of electric and magnetic fields, using synchrotron based inelastic photon scattering. LÄS MER
3. A Central Rapidity Straw Tracker and Measurements on Cryogenic Components for the Large Hadron Collider
Sammanfattning : This thesis is divided into two parts in which two different aspects of the Large Hadron Collider (LHC) Project are discussed. The first part describes the design of a transition radiation tracker (TRT) for the inner detector in ATLAS. In particular, the barrel part was studied in detail. The barrel TRT consists of 52 544 1. LÄS MER
4. Soft X-ray Scattering Dynamics Close to Core Ionization Thresholds in Atoms and Molecules
Sammanfattning : In this Thesis studies of highly excited states in gas-phase atoms and molecules (He, Ne, N2, O2, N2O and CO2) using a variety of synchrotron-radiation based techniques are presented. The three techniques used most frequently are X-ray-emission-threshold-electron coincidence (XETECO), X-ray emission spectroscopy (XES) and X-ray photoelectron spectroscopy (XPS) and they are all given a brief introduction. LÄS MER
5. Peritoneal fibrinolysis during pneumoperitoneum and laparoscopic surgery
Sammanfattning : BACKGROUND Laparoscopic surgery is believed to induce less postoperative adhesion formation compared with open procedures, but information regarding biological impact of a laparoscopic approach is limited. MATERIAL & METHODS Peritoneal response to laparoscopic surgery was assessed in human peritoneal tissue in two clinical trials (paper I & V). LÄS MER