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Now showing items 2201-2300 of 2360
(Master thesis / Masteroppgave, 2009)
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2009)
It is a challenge to find interesting and realistic projects where numerical methods can be used to enhance student understanding of physical phenomena. We present such a project in which a group of students used numerical ...
(Doctoral thesis / Doktoravhandling, 2009)
The present work was set to study materials, and in particular thermoelectric materials based on first-principle calculations. Density functional theory was used to calculate the electronic structure of skutterudites, Zintl ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2009)
The electronic structure and optical properties of orthorhombic, monoclinic, and rhombohedral (corundum type) modifications of ZnSiO3, and of rhombohedral, tetragonal, and cubic (spinel type) modifications of Zn2SiO4 have ...
(Doctoral thesis / Doktoravhandling, 2009)
Ved behandling av avansert livmorhalskreft spiller stråleterapi en avgjørende rolle og det gis både ekstern og intern behandling (brachyterapi). Stråleterapi er alltid en avveiing mellom dosen som kan gis til maligne områder ...
(Doctoral thesis / Doktoravhandling, 2009)
Nanoscaled electronic devices have attracted much attention due to their optical and electronic properties, especially related to MOS (Metal-Oxide-Semiconductor) devices used for memory storage applications. Improved ...
(Master thesis / Masteroppgave, 2009)
De siste årene har det vært stor fokus på rekruttering til realfag og læreryrket. Et av tiltakene har vært Lektor- og adjunktprogrammet (LAP) ved Universitet i Oslo som gir en faglærerutdanning med mastergrad på fem år og ...
(Master thesis / Masteroppgave, 2009)
Hvis de fornybare og CO2-frie alternativene til fossilt brensel som sol-, vind- og vannkraft skal forsyne verden med energi, må denne konverteres fra elektrisitet til et energimedium. Hydrogen er en lovende kandidat som ...
(Master thesis / Masteroppgave, 2009)
Machs prinsipp angår et bredt spekter av fenomener knyttet til hvordan ting vekselvirker på lange, til og med kosmologiske, avstander. I denne masteroppgaven gir jeg en historisk oversikt over forskning som har foregått ...
(Master thesis / Masteroppgave, 2009)
(Master thesis / Masteroppgave, 2009)
Stråleterapi er en vanlig behandlingsmetode av pasienter med kreft. Behandlingen utføres ved å bestråle områder i pasienten hvor det er kreftsykdom, og på den måten drepe kreftcellene. For at behandlingen skal være vellykket ...
(Master thesis / Masteroppgave, 2009)
Hydrothermal ZnO samples having lithium concentration in the range
of $3 \times 10^{14}$ -- $1 \times 10^{17}$\,Li/cm$^{3}$ were
implanted with nitrogen. The variation of Li concentration was done
by high temperature ...
(Master thesis / Masteroppgave, 2009)
This thesis is a study of coherence theory in light in classical
electromagnetism and quantum optics. %The coherence is quantified
Specifically two quantities are studied: The degree of first-order
temporal coherence, which ...
(Master thesis / Masteroppgave, 2009)
Oppgaven gir en innføring i anyoner, partikler med fraksjonell statistikk som kun finnes i to-dimensjonale systemer. Disse partiklene interpolerer mellom bosoner og fermioner, og derfor behandles også de to-dimensjonale ...
(Master thesis / Masteroppgave, 2009)
(Master thesis / Masteroppgave, 2009)
(Master thesis / Masteroppgave, 2009)
(Master thesis / Masteroppgave, 2009)
Hydrogen storage in a mixed system of lithium and sodium amide : A DFT modeling study Restricted Access
(Master thesis / Masteroppgave, 2009)
Summary
In the development of non-emissive hydrogen cars, an efficient and safe hydrogen storage method is needed. One possibility is reversible storage of hydrogen in solid materials. Throughout the last decade, intense ...
(Master thesis / Masteroppgave, 2009)
Zinc oxide (ZnO) is becoming an attractive semiconductor material
within optoelectronics and solar cell applications. The usage
of ZnO as a transparent conducting oxide (TCO) is interesting both as
electrode in Si-based ...
(Master thesis / Masteroppgave, 2009)
The time-independent Schrödinger equation is solved using the finite element method (FEM) and the finite difference method (FDM). The resulting eigenvalue problems are solved using the ARPACK++ library. Both methods are ...
(Master thesis / Masteroppgave, 2009)
Intelligent and Adaptive Systems in Cancer Biomedicine Restricted Access
(Doctoral thesis / Doktoravhandling, 2009)
Sammen med kirurgi er stråleterapi den behandling som helbreder flest kreftpasienter. Behandlingsresultatet er imidlertid avhengig av tilskrekkelig høye stråledose til kreftsvulsten, uten at omliggende friskt vev og organer ...
(Master thesis / Masteroppgave, 2009)
T-47D cells were gamma-irradiated at acute dose rates by a Co-60 source, and their low-dose response was studied by clonogenic assay. T-47D cells have previously been found to express low-dose hyper-radiosensitivity (HRS) ...
(Master thesis / Masteroppgave, 2009)
In this thesis, we studied numerically systems consisting of several interacting electrons in two-dimensions, confi ned to small regions between layers of semiconductors.
These arti cially fabricated electron systems are ...
(Master thesis / Masteroppgave, 2009)
In this thesis, a numerical study of double layers in plasma is presented. Double layers
are structures consisting of two oppositely charged space charge layers, creating a finite
change in electrostatic potential over the ...
(Master thesis / Masteroppgave, 2009)
Radioimmunterapi (RIT) benytter seg av konjugater av radionuklider og antistoffer for å avsette terapeutisk stråledose til kreftceller som uttrykker de rette antigenene. Hovedmålet med denne oppgaven var å undersøke effekten ...
(Master thesis / Masteroppgave, 2009)
Diffusjonstensor avbildning (DTI) er et relativt anerkjent men nytt verktøy innen MRI. DTI er følsom for strukturelle egenskaper i vev som ikke er målbar med konvensjonelle MR-teknikker. Teknikken gjør det mulig å måle ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2009)
A study of the inclusive charged hadron production in two-photon collisions is described. The data were collected with the DELPHI detector at LEP II. Results on the inclusive single-particle pTpT distribution and the ...
(Master thesis / Masteroppgave, 2009)
Denne oppgaven omhandler prototypeutvikling av et nytt multi-Nål Langmuir Probe system (m-NLP). Systemet har blitt utviklet ved UiO for bruk på sonderaketter og satellitter. Måleprinsipper, design av instrumentet, samt ...
(Master thesis / Masteroppgave, 2009)
This master’s thesis explores how to minimize the long-lived actinide waste that is produced in nuclear power plants by performing simulations of thoriated nuclear fuels in existing reactor designs.
An European pressurized ...
(Doctoral thesis / Doktoravhandling, 2008)
The work presented in this thesis concerns the study of complex nanofluids. The interaction of particles in dispersions under the influence of electric and magnetic fields has been studied. The main focus has been the ...
(Master thesis / Masteroppgave, 2008)
Abstract:
The energy dissipation in an earthquake can be partitioned into three components Wtot = Wradiated +Wexpansion +Wfriction, where Wradiated is the seismic radiated energy, Wexpansion is the energy consumed propogating ...
(Master thesis / Masteroppgave, 2008)
Det har de siste årene blitt påvist stor strålefølsomhet i celler bestrålt med doser under 0.5 Gy i en rekke ulike celletyper. Dette fenomenet kalles hypersensitivitet (HRS). Effektbestrålinger utført i denne oppgaven med ...
(Master thesis / Masteroppgave, 2008)
Formålet med denne oppgaven var å benytte cone beam CT (CBCT)-avbildning til å kvantifisere tumorbevegelse og anatomiske endringer av risikoorgan over en fraksjonert behandling av prostatakreft. Videre skulle biologiske ...
Investigations of dose reduction and diagnostic image quality using bismuth shielding during CT examination of lungs Restricted Access
(Master thesis / Masteroppgave, 2008)
Abstract
The introduction of Computed Tomography (CT) in radiology in the 1970 s was followed by rigorous radiation protection demands due to the higher doses of this modality compared to conventional x-ray based radiography. ...
Tilpasning av et kommersielt tilgjengelig generisk sanntids-signalprosesseringssystem for anvendelse som høyoppløselig radar Restricted Access
(Master thesis / Masteroppgave, 2008)
This thesis for the masters degree at the University of Oslo, department of informatics is describing work done on implementing a high resolution Dopplerradar on commercially available COTS-hardware.
Traditionally, radio ...
(Master thesis / Masteroppgave, 2008)
Reducing the supply voltage of operational amplifers and analog circuitry in general, is
of great importance as it will ensure the future coexistence of analog and digital circuits
on the same silicon die. While digital ...
(Master thesis / Masteroppgave, 2008)
In this work, intramolecular and intermolecular associations under the effect of shear flow of dilute aqueous alkaline solutions of dextan, hydroxyethylcellulose (HEC), and the hydrophobically modified analogue (HM-2-HEC) ...
(Master thesis / Masteroppgave, 2008)
Bakgrunn
Masteroppgaven omfatter modellering, simulering og analysering av kontaktkreftene mellom strømavtager WBL 88 og kontaktledningssystem 20 B. Det er gjort målinger på system 20B mellom Sarpsborg og Kornsjø med ...
(Research report / Forskningsrapport, 2008)
(Utgitt i serien Eureka Digital (ISSN 0809-8360) nr 13/2008)
Satellitter representerer en ny og stadig viktigere metode for forskning og overvåking av jordens miljø og endringer som skyldes menneskelige aktiviteter. Bruk ...
A new dosimetric protocol for high energy photon radiotherapy beams in Norway using radiochromic film Restricted Access
(Master thesis / Masteroppgave, 2008)
The continual development of high energy photon beam radiotherapy in Norway urges for a revision in dosimetric quality controls. It is favorable to use sharply defined fields, but existing routines for quality assurance ...
(Master thesis / Masteroppgave, 2008)
This thesis gives a description of a prototype bioimpedance measurement
system based on the integrated circuit AD5933. The prototype operates
from 5 - 100 kHz and covers the impedance range 0.1k
- 10 M
in six
subranges.
The ...
(Master thesis / Masteroppgave, 2008)
If a magnetic field above a certain critical field (Bc1) is imposed on a type II superconductor, it will start to penetrate in the form of magnetic flux quanta, or vortices, resulting in a meta-stable non-equilibrium critical ...
(Research report / Forskningsrapport, 2008)
(Utgitt i serien Eureka Digital (ISSN 0809-8360) nr 12/2008)
Til alle tider har planter, dyr og mennesker vært utsatt for radioaktiv stråling. Vi lever i et miljø med kosmisk stråling fra verdensrommet og med naturlig ...
(Master thesis / Masteroppgave, 2008)
Strålingsinduserte skader hos levende organismer antas i første rekke å skyldes skader på arvemolekeylet DNA. DNA er under mesteparten av cellesyklus kveilet sammen med histonene i cellekjernen. DNA-histon-kompleksene, ...
(Master thesis / Masteroppgave, 2008)
Denne oppgaven dreier seg om bruk av datalogging i fysikkundervisningen i videregående skoler. Oppgaven tar for seg følgende forskningsspørsmål:
1. Hvilke forutsetninger har fysikklærere for å bruke
datalogging ...
(Master thesis / Masteroppgave, 2008)
The Higgs mechanism is the best candidate theory for explaining how elementary particles obtain masses, but the Higgs boson predicted by this theory is as of today not observed. The Higgs to gamma gamma channel is one of ...
(Master thesis / Masteroppgave, 2008)
Sammendrag
Denne oppgaven er en del av FYS 21-prosjektet og tar for seg utvikling og utprøving av undervisningsopplegg med empirisk-matematisk modellering i fysikk for tredjeklasse på videregående skole.
Hensikten med å ...
(Master thesis / Masteroppgave, 2008)
1.0 Sammendrag
Under arbeid med prosjektet har jeg som innledende delprosjekt arbeidet med analoge kretsløsninger, herunder likeretting og omhylningskurve av ekkosignal. Konklusjon og erfaring fra innledende prosjekt vil ...
(Master thesis / Masteroppgave, 2008)
(Master thesis / Masteroppgave, 2008)
I celler pakkes DNA-molekylet tett sammen rundt flere ulike proteiner, de såkalte histonene. Det er av interesse å kartlegge hvorledes denne nære kontakten mellom DNA og proteiner påvirker strålingsresponsen til DNA. DNA ...
(Master thesis / Masteroppgave, 2008)
The equation of motion for a classical charged point particle in curved space-time is given by the generalized Lorentz-Abraham-Dirac equation. This equation contains a nonlocal term called the tail term, which consists of ...
(Master thesis / Masteroppgave, 2008)
(Master thesis / Masteroppgave, 2008)
Stylolites are features of localized dissolution in sedimentary rocks. They are planes oriented normal to the compaction direction and have a rough and often teeth-like surface structure. The vertical spacing of individual ...
(Master thesis / Masteroppgave, 2008)
LHC akseleratoren (Large Hadron Collider) ved CERN (Organisation euroéenne pour la recherche nucléaire) i Sveits starter opp i disse dager, og med den en ny æra i partikkel-fysikken. Fysikere involvert i ATLAS detektoren ...
(Master thesis / Masteroppgave, 2008)
For å lette arbeidet med å designe og analysere optimale/suboptimale Kalmafiltere kreves det at en gjør en rekke analyser for å verifisere designet. For å gjøre dette ønsker vi å lage et Matlab-program med et grafisk ...
(Master thesis / Masteroppgave, 2008)
Denne oppgaven omhandler bruk av optikk i form av infrarødt lys som
kommunikasjonsbærer i et trådløst sensornettverk over og under vann.
Oppgaven tar for seg hvordan et sensornettverk bestående av Tmote Sky
sensornoder fra ...
(Journal article / Tidsskriftartikkel / PublishedVersion, 2008)
(Master thesis / Masteroppgave, 2008)
The Gaussian sum filter is a track reconstruction algorithm specialized on dealing with the non-Gaussian radiative energy loss of electrons. This thesis deals with invariant mass determination from the non-Gaussian track ...
(Doctoral thesis / Doktoravhandling, 2008)
The dynamics of various fundamental defects in electron-irradiated high-purity silicon detectors (diodes) were investigated by deep-level transient spectroscopy (DLTS). Samples with various oxygen concentrations were used ...
(Doctoral thesis / Doktoravhandling, 2008)
Silicon technology has become a cornerstone for the technological advances in our society for the last five decades. For carrying on with minimization of electronic devices a huge effort has been directed toward the ...
(Doctoral thesis / Doktoravhandling, 2008)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2008)
Conditional sampling methods are generalized by applying a matched-filter on the reference signal. This generalized method is illustrated by data obtained in a magnetized toroidal plasma without rotational transform. By ...
(Doctoral thesis / Doktoravhandling, 2008)
The present work is a study of the relationship between a quantum Hall system and its one-dimensional representation. The standard theory, which is based on general arguments, predicts that the edge of the quantum Hall ...
(Doctoral thesis / Doktoravhandling, 2008)
Like the majority of investigated cell lines, T-47D breast cancer cells display a pronounced low dose hyper-radiosensitivity when irradiated with 60Co ƒ×-rays. The well-known transient abolition of hypersensitivity by a ...
(Master thesis / Masteroppgave, 2008)
Sammendrag
Hovedmålet med denne oppgaven var å undersøke α-emitteren, radium-223s, cellulære effekter. 223Ra er virkestoffet i legemiddelet AlpharadinTM som for tiden utprøves i klinikk under en fase III studie. Legemiddelets ...
(Master thesis / Masteroppgave, 2008)
(Master thesis / Masteroppgave, 2008)
Study of galactic dynamics using models based on general relativity.
(Master thesis / Masteroppgave, 2008)
Oppgaven undersøker om det er mulig å bruke ultralyd som kommunikasjonsbærer i et sensornettverk, og effektforbruket denne
kommunikasjonsmetoden medfører. Oppgaven er en del av et større
prosjekt støttet av Hydro, der ulike ...
(Master thesis / Masteroppgave, 2008)
The nuclei 163,164 Dy were analyzed at the Oslo Cyclotron laboratory (OCL) by use of the so-called Oslo method. This method enables us to extract both the level density and the γ -ray strength function simultaneously from ...
(Master thesis / Masteroppgave, 2008)
MEMS-systemer har gjennom årene blitt et stort forskningfelt, med en rekke kommersielle suksesser.
Siden 1990, har fordelene med MEMS, som alternativ løsning i trådløse systemer, blitt fremhevet som følge av den stadig ...
(Master thesis / Masteroppgave, 2008)
(Master thesis / Masteroppgave, 2008)
I CT (Computed Tomography) bygges bildene opp på grunnlag av en størrelse kalt CT-tall, eller Hounsfield-enheter (HU). CT-tallskalaen er definert ut fra to punkter vann (0 HU) og luft (-1000 HU). CT-tall måles enkelt på ...
(Master thesis / Masteroppgave, 2008)
If a future hydrogen society is to be established, a highly efficient solid-state hydrogen storage material must be found. The metal-N-H system, which is one of the new promising candidates, has been given considerable ...
(Master thesis / Masteroppgave, 2008)
In this thesis we have annealed hydrothermally (HT) grown ZnO samples at temperatures ranging from 600C to 1600C, and examined the effects on the lithium content, the resistivity and the surface topography. Starting with ...
(Master thesis / Masteroppgave, 2008)
The Micro-Electro-Mechanical Systems (MEMS) have found wide application in medicine these days. Lots of them are used in form of implanted devices which usually demand complicated design and fabrication requirements. One ...
(Master thesis / Masteroppgave, 2008)
I denne oppgaven ser jeg på bruken av et Personal Response System (PRS) i mekanikkurset på Universitetet i Oslo. Dette fungerer slik at foreleser stiller flervalgsspørsmål i plenum, og studentene kan svare ved å trykke på ...
(Master thesis / Masteroppgave, 2008)
Standard Modellen (SM) beskriver det meste av det vi har observert i eksperimenter fram til i dag. Allikevel er SM ikke sett på som en komplett teori, men heller en effektiv teori som fungere bra opp til et visst energinivå. ...
(Master thesis / Masteroppgave, 2008)
(Master thesis / Masteroppgave, 2008)
I denne master oppgaven ser jeg på teorien bak en Optisk pinset, og på de forskjellige måtene man kan kalibrere pinsetten på. I tillegg ble Dynamisk lyspredning (DLS) brukt til å måle partikkel størrelsene
(Master thesis / Masteroppgave, 2008)
Calculations of the transition strength of C16 and study the structure of nuclei near C16 in order to understand the degrees of freedom involved in the low-lying states of these nuclei. The main emphasis, in addition to ...
(Master thesis / Masteroppgave, 2008)
In this thesis we studied method of subtractive interference cancellation applied to multiuser systems. We developed algorithms for simulation of a point-to-point communication system that uses the techniques of interference ...
(Master thesis / Masteroppgave, 2008)
(Doctoral thesis / Doktoravhandling, 2008)
Almost a century after the discovery of the atomic nucleus, all of its secrets are still not revealed. This dissertation presents experimental observations on statistical properties of medium-mass nuclei at high temperatures. ...
(Master thesis / Hovedoppgave, 2007)
Sammendrag
Denne oppgaven beskriver arbeidet med å karakterisere høytemperaturegenskapene til Ca12Al14O33, også kalt Mayenitt, 12CaO•7Al2O3 eller bare C12A7. Det er rapportert at Mayenitt inneholder hydridioner etter ...
(Master thesis / Masteroppgave, 2007)
The introduction of turbo codes in 1993 was a breakthrough in constructing error correction codes that were able to approach the theoretical limit of performance. Different implementations of turbo codes have become widely ...
(Master thesis / Masteroppgave, 2007)
Epitaxial p+/n–/n+ silicon diodes have been irradiated with 6 MeV electrons to a dose of 1014 cm−2, and isochronal and isothermal annealings at the temperatures 325 – 360 C has been performed. The reaction kinetics of VO, ...
(Master thesis / Masteroppgave, 2007)
Abstract
The purpose of this thesis is the investigation of the intratumoural network through image analysis of histological sections. Tumour vasculature is characterized by complexity, irregularities and poorly regulated ...
(Master thesis / Masteroppgave, 2007)
Oppgaven tar for seg analyse av data fra et kjernefysisk forsøk utført ved Oslo syklotronlaboratorium våren 2005. En folie med naturlig nikkel ble bestrålet med helium-ioner. Naturlig nikkel består for det meste av isotopet ...
(Master thesis / Masteroppgave, 2007)
Denne oppgaven presenterer en rask måte å invertere komplekse matriser
i en FPGA (Field Programmable Gate Array). Motivasjonen for oppgaver
har vært behov for rask matriseinvertering i forbindelse med kanalutjevning
i ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2007)
(Master thesis / Masteroppgave, 2007)
(Master thesis / Masteroppgave, 2007)
Simultaneous two-phase flow in porous media has been studied
experimentally, in a large quasi two-dimensional laboratory model of
roughly $~214000$ pores. Both the invasion phase and steady-state
have been considered. ...
(Master thesis / Masteroppgave, 2007)
In this study we take advantage of the slow, smooth rotation of the strong magnetic fields in interplanetary
magnetic clouds to identify transitions between particle precipitation/plasma convection
states of the magnetosphere ...
(Master thesis / Masteroppgave, 2007)
En høyytelse fastoksidbrenselcelle (LSCF|YDC|YSZ|NiYSZ) ble karakterisert i en kommersiell målecelle (ProboStat™). Det ble brukt et to-elektrode måleoppsett for elektrokjemisk impedansspektroskopi (EIS) og strøm-speningsmålinger, ...
(Doctoral thesis / Doktoravhandling, 2007)
This works is dedicated to study of magnetic flux properties in thin-film superconductors. At present time superconductors are widely used in various micro- and nanoelectronic devices, for example, extremely sensitive ...
(Doctoral thesis / Doktoravhandling, 2007)
The thesis presents results on two different aspects of flux penetration into superconductors. It is predominantly an experimental study using magneto-optical imaging, a microscopy technique for visualising magnetic ...
(Doctoral thesis / Doktoravhandling, 2007)
The present work is a study of the electronic structure and bonding of the class of materials often called skutterudites. These materials have received much attention during the past decade, largely because their thermoelectric ...
(Doctoral thesis / Doktoravhandling, 2007)
This thesis concerns light and drug dosimetry for photodynamic cancer treatment – a treatment modality where a photosensitizer uses the energy of light to damage biological matter. Porphyrin precursors were used as prodrugs ...