Blar i Department of Physics and Technology på emneord "VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430"
Viser treff 1-20 av 66
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Acoustic measurement of liquid density with applications for mass measurement of oil
(Doctoral thesis, 2007-11-23) -
Acoustic Methods for Obtaining the Pressure Reflection Coefficient from a Buffer Rod Based Measurement Cell
(Peer reviewed; Journal article, 2008-08-08)The known acoustic methods for obtaining the pressure reflection coefficient from a buffer rod based measurement cell are presented, along with 2 new generic approaches for measuring the pressure reflection coefficient ... -
Adaptive transdure basert på tidsreversering. Målinger på en 5x5 array prototype
(Master thesis, 2009-06-11)Utvikling av adaptiv transduserarray som er ment for tidsreverserende bruk på en olje/gass-separator. Prinsippet består i styring av en transduser oppdelt i små ankeltceller (array). Hver celle styres av sin egen elektronikk, ... -
Aspects of Electron Dynamics in Atoms Exposed to Single Cycle Electromagnetic Pulses
(Doctoral thesis, 2018-06-29)This thesis covers the topic in atomic physics: Interaction of a strong external field with Rydberg hydrogen atom. In three scientific publications, we have targeted physical processes such as the field ionization in the ... -
Automated XY-table for the characterisation of arrays of pixel sensors for photons and charge particles
(Master thesis, 2010-06-01)A variety of arrays of pixels sensors (pixel = picture elements) have been developed during the last 30 years for the detection of photons and charge particles. Pixel based semiconductor detectors are not only used for ... -
Challenges and Strategic Research Plans for Earth and Heliosphere: Research Infrastructures, Projects and Initiatives
(Peer reviewed; Journal article, 2018-07-24)We describe existing research infrastructures relevant for space weather and open issues of space weather research including the need for sustainable observation networks and for high-quality data products as basis for ... -
Challenges related to storage and transfer of solar energy with a case study on long distance power transfer
(Master thesis, 2010-06-21)The challenges that will be discussed in this thesis are two-fold; the problems related to trans- mission of power over long distances, and the need for energy storage, especially at night. Both of the issues are accentuated ... -
Charged Higgs boson searches and SemiConductor Tracker commissioning for the ATLAS experiment
(Doctoral thesis, 2007-06-21)The ATLAS (A Toroidal Lhc ApparatuS) experiment is one of four major experiments presently being installed at the upcoming Large Hadron Collider (LHC) at the European Centre for Nuclear Research (CERN) outside Geneva. In ... -
Classical and quantum-mechanical scaling of ionization from excited hydrogen atoms in single-cycle THz pulses
(Peer reviewed; Journal article, 2017-08-25)Excited atoms, or nanotip surfaces, exposed to strong single-cycle terahertz radiation emit electrons with energies strongly dependent on the characteristics of the initial state. Here we consider scaling properties of the ... -
Comparison of burning velocity differences in a numerical explosion simulator
(Master thesis, 2014-06-02)A verification study of the two flame models in the numerical explosion simulation tool FLACS has been conducted. The beta flame model, and the SIF flame model has been tested in a 1D-channel at different time step sizes. ... -
Design og studier av lydkilde for SOBER-prosjektet
(Master thesis, 2002)An ultrasonic sound source was constructed for the University of Bergen’s participation in the Sonic Boom European Research project. A piezoceramic disc was chosen as the active element and some of its properties were ... -
Development, use, and validation of the CFD tool FLACS for hydrogen safety studies
(Doctoral thesis, 2010-06-18)Computational Fluid Dynamics (CFD) calculations for gas explosion safety have been widely used for doing risk assessments within the oil and gas industry for more than a decade. Based on predicted consequences of a range ... -
The effect of energetic electron precipitation on the nitric oxide density in the lower thermosphere
(Doctoral thesis, 2007-02-09) -
Effects of nonlinear sound propagation in fisheries research
(Doctoral thesis, 2007-03-30) -
Electric spark ignition of sensitive dust clouds in the sub 1 mJ range
(Doctoral thesis, 2006-05-30)This thesis describes a study of the minimum ignition energy (MIE) of easily ignitable dust clouds in air. The MIE is a central parameter when assessing the risk involved when handling combustible dusts. Current standard ... -
Endelig element modellering av Piezoelektriske skiver
(Master thesis, 1996) -
Evaluating tertiary water based EOR methods on the Veslefrikk field, with emphasis on analyzing sodium silicate injection by numerical simulation
(Master thesis, 2009-04-29)The applicability of some water based EOR methods was evaluated for the Veslefrikk field. Diversion of injection water, by injection of sodium silicate, was regarded as having an EOR potential. This was analyzed by numerical ... -
Experimental and theoretical study of the flow, aggregation and deposition of gas hydrate particles
(Doctoral thesis, 2010-06-21)Gas hydrate plugging is considered to be a very problematic topic during petroleum production and transportation. The phenomenon of hydrate plug formation involves inter-related effects related to different disciplines, ... -
Experimental Characterization of High-Pressure Natural Gas Scrubbers
(Doctoral thesis, 2006-10-20)Scrubber design practice today is largely based on experimental data generated at ambient conditions with model fluid system such as air-water. Though good efficiency is often measured in the lab, real natural gas scrubbers ... -
Experimental Investigation of the Impedance Measurement Method for Detecting Dust and Gas Flames in a Flame Acceleration Tube. Development of Experimental Apparatus
(Master thesis, 2009-06-02)This thesis describes an experimental investigation of flame propagation in a 3.6-meter Flame Acceleration Tube (FAT) by the use of optical probes for flame detection and dust concentration measurements. The experiments ...