Showing papers by "Jenny Karlsson published in 2013"

Measurement of linewidths and permanent electric dipole moment change of the Ce 4f-5d transition in Y2SiO5 for qubit readout scheme in rare-earth ion based quantum computing

Abstract: In this work the inhomogeneous (zero-phonon line) and homogeneous linewidths and the permanent electric dipole moment change (averaged value of all dipole orientations) for the Ce 4f-5d transition in Y2SiO5 were measured in order to investigate the possibility for using Ce as a sensor to detect the hyperfine state of a spatially close-lying Pr or Eu ion. The experiments were carried out on Ce doped or Ce-Pr co-doped single Y2SiO5 crystals. The homogeneous linewidth is essentially limited by the excited state lifetime. Based on the linewidth measurements, the oscillator strength, absorption cross section, and saturation intensity were calculated to be about 6.2(+/- 1.7) x 10(-7), 4.5(+/- 1.3) x 10(-19) m(2), and 1.4(+/- 0.4) x 10(7) W/m(2), respectively. The difference in permanent dipole moment, Delta mu(Ce), between the ground and excited states of the Ce ion was measured as 9.6(+/- 5.3) x 10(-30) C m. These measurements indicate that Ce is a promising readout ion to probe a single-ion qubit state for the quantum computing scheme using rare-earth ions. (Less)

Absence of epstein–barr and cytomegalovirus infection in neuroblastoma cells by standard detection methodologies

Abstract: Indications exist in the scientific literature that infection with human herpes family viruses may contribute to the pathogenesis of neuroblastoma (NB). However, systematic investigations regarding viral presence in NB cells have been scarcely reported. Here, the presence of DNA from Epstein-Barr virus (EBV) and human cytomegalovirus (HCMV) was assessed by PCR in 12 NBs, supplemented with RNA in situ hybridization, immunohistochemical detection, and high-throughput DNA sequencing. These standard methods did not detect infection by EBV or HCMV in NB cells in any tumor, while occasional immune cells were positive for EBV RNA or HCMV protein in four cases.

Sex som självskadebeteende: fenomenet ur terapeuters perspektiv

Abstract: Som ett led i forskningen kring sjalvskadebeteenden har man borjat fokusera pa det fenomen som brukar kallas ”sjalvdestruktivt sex” och ”sex som sjalvskadebeteende”. Detta ar ett daligt definierat och utforskat omrade, dar det saknas systematiserad kunskap och vedertagna begreppskonventioner. Denna uppsats syftar till att undersoka vad som karakteriserar sex som sjalvskadebeteende, och varfor personer agnar sig at detta. Sammantaget 40 informanter med erfarenhet av klient- och patientarbete inom psykisk halsovard har besvarat en natbaserad enkat, med fragor om sexuellt sjalvdestruktiva beteenden samt dessa beteendens funktion. Resultaten indikerade att sex som sjalvskadebeteende forekommer hos olika personer, som sarskilt fokus eller som associerat problemomrade vid psykologisk behandling, och kan patraffas i olika sammanhang. Forekomsten av dessa beteenden uppskattas av informanterna skilja sig signifikant mellan kvinnor och man. Sexuellt sjalvskadebeteende uppfattas vidare fylla samma typ av funktioner som andra sjalvskadebeteenden. En viktig slutsats ar att ytterligare forskning kring fenomenet behovs, exempelvis kring vad som karakteriserar, definierar och avgransar fenomenet, samt vilket bemotande och behandling som behovs for personer med sexuellt sjalvskadebeteende.