Results
repositories = "Linköping University Electronic Press"
> : "Physics"
(x)
Microwave Power Devices and Amplifiers for Radars and Communication Systems
Author(s) :
Azam, Sher
Description :
SiC MESFETs and GaN HEMTs posses an enormous potential in power amplifiers at microwave frequencies due to their wide bandgap features of high electric field strength, high electron saturation velocity and high operating temperature. The high power density combined with the comparably high impedance...
Repository :
Linköping University Electronic Press
Language(s) :
English
Instability and dynamics of two nonlinearly coupled laser beams in a plasma
Author(s) :
Shukla, Padma K
,
Eliasson, Bengt
,
Marklund, Mattias
,
Stenflo, Lennart
,
Kourakis, Ioannis
,
Parviainen, Madelene
Description :
The nonlinear interaction between two laser beams in a plasma is investigated in the weakly nonlinear and relativistic regime. The evolution of the laser beams is governed by two nonlinear Schrödinger equations that are coupled with the slow plasma density response. A nonlinear dispersion relation i...
Repository :
Linköping University Electronic Press
Language(s) :
English
Dominant recombination centers in Ga(In)NAs alloys: Ga interstitials
Author(s) :
Wang, Xingjun
,
Puttisong, Yuttapoom
,
Tu, C. W.
,
Ptak, Aaron J.
,
Kalevich, V. K.
,
Egorov, A. Yu.
,
Geelhaar, L.
,
Riechert, H.
Description :
Opticallydetected magnetic resonance measurements are carried out to study formationof Ga interstitial-related defects in Ga(In)NAs alloys. The defects, whichare among dominant nonradiative recombination centers that control carrier lifetimein Ga(In)NAs, are unambiguously proven to be common grown-i...
Repository :
Linköping University Electronic Press
Language(s) :
English
How large can the electron to proton mass ratio be in particle-in-cell simulations of unstable systems?
Description :
Particle-in-cell simulations are widely used as a tool to investigate instabilities that develop between a collisionless plasma and beams of charged particles. However, even on contemporary supercomputers, it is not always possible to resolve the ion dynamics in more than one spatial dimension with ...
Repository :
Linköping University Electronic Press
Language(s) :
English
Evidence for a phosphorus-related interfacial defect complex at a GaP/GaNP heterojunction
Author(s) :
Dagnelund, Daniel
,
Vorona, I. P
,
Vlasenko, L. S.
,
Wang, X. J.
,
Utsumi, A.
,
Furukawa, Y.
,
Wakahara, A.
,
Yonezu, H.
,
Buyanova, I. A.
Description :
Optically detected magnetic resonance (ODMR) studies of molecular beam epitaxial GaNP/GaP structures reveal presence of a P-related complex defect, evident from its resolved hyperfine interaction between an unpaired electronic spin (S=1/2) and a nuclear spin (I = ½) of a 31P atom. The principal axis...
Repository :
Linköping University Electronic Press
Language(s) :
English
Quantitative Magnetic Resonance in Diffuse Neurological and Liver Disease
Author(s) :
Dahlqvist Leinhard, Olof
Description :
Introduction: Magnetic resonance (MR) imaging is one of the most important diagnostic tools in modern medicine. Compared to other imaging modalities, it provides superior soft tissue contrast of all parts of the body and it is considered to be safe for patients. Today almost all MR is performed in a...
Repository :
Linköping University Electronic Press
Language(s) :
English
A Monte Carlo-based model for simulation of digital chest tomosynthesis
Author(s) :
Ullman, Gustaf
,
Dance, David R.
,
Sandborg, Michael
,
Alm Carlsson, Gudrun
,
Svalkvist, Angelica
,
Båth, Magnus
Description :
The aim of this work was to calculate synthetic digital chest tomosynthesis projections using a computer simulation model based on the Monte Carlo method. An anthropomorphic chest phantom was scanned in a computed tomography scanner, segmented and included in the computer model to allow for simulati...
Repository :
Linköping University Electronic Press
Language(s) :
English
Kärnfysikaliska grunder för radioaktiva nuklider
Author(s) :
Alm Carlsson, Gudrun
Description :
Förståelsen av den joniserande strålningen och dess växelverkan med materia förutsätter kännedom om atomens natur. Atomen (grekiska "atomos" = odelbar) är den minsta del av ett grundämne, som bibehåller ämnets identitet, dvs. uppvisar dess karakteristiska kemiska egenskaper. Individuella atomer är f...
Repository :
Linköping University Electronic Press
Language(s) :
Swedish
Strålningsdosimetri med radioaktiva nuklider i människa
Author(s) :
Carlsson, Carl
Description :
Strålningsdosimetri motiveras i denna kurs främst därför att den absorberade strålningsenergin förorsakar biologiska effekter i kroppens vävnader. Risken för ogynnsamma biologiska effekter hos patienter och personal begränsar radionuklidernas användning inom medicinen. Eftersom alla strålningsdetekt...
Repository :
Linköping University Electronic Press
Language(s) :
Swedish
Statistisk precision vid radioaktivitetsmätning och Aktivitetsbestämning ur uppmätt räknehastighet
Description :
Radioaktiva sönderfall sker slumpmässigt och det är omöjligt att i förväg veta exakt när en viss atom sönderfaller. Allt man kan säga är att under en halveringstid är sannolikheten 0.5 att en atom sönderfaller och 0.5 att den förblir i sitt ursprungliga radioaktiva tillstånd. Detta gäller en enstaka...
Repository :
Linköping University Electronic Press
Language(s) :
Swedish