Sökning: "transient evolution"

Visar resultat 11 - 15 av 62 avhandlingar innehållade orden transient evolution.

1. 11. Kilonova signatures and observations with Zwicky Transient Facility

   Författare :Ana Sagués Carracedo; Ariel Goobar; Chad Finley; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; kilonovae - neutron stars - gravitational waves; High Energy Physics; högenergifysik; Physics; fysik;

   Sammanfattning : On 17 August 2017, the advanced LIGO and Virgo collaboration detected the first gravitational wave event produced by the merger of a pair of inspiraling binary neutron stars (BNS). This event, named GW170817, was associated with a short gamma-ray burst and the kilonova (KN) AT2017gfo that was followed-up over the following days and weeks over the electromagnetic spectrum from ultraviolet to near infrared frequencies. LÄS MER

3. 12. Stripped-envelope supernovae discovered by the Palomar Transient Factory

   Författare :Christoffer Fremling; Jesper Sollerman; Federica Bianco; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; supernovae; transients; Astronomy; astronomi;

   Sammanfattning : This thesis is based on research made by the intermediate Palomar Transient Factory [(i)PTF]. The focus is on stripped-envelope (SE) supernovae (SNe) discovered by (i)PTF, and it is closely tied to the research on the SE SN iPTF13bvn, that occurred in the nearby galaxy NGC 5806. LÄS MER

4. 13. PTF12os and iPTF13bvn : Two stripped-envelope supernovae discovered by the Palomar Transient Factory

   Författare :Christoffer Fremling; Jesper Sollerman; Ross Church; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; sovernovae;

   Sammanfattning : This thesis is based on research made by the intermediate Palomar Transient Factory [(i)PTF], and it is particularly closely tied to the still ongoing research on the stripped-envelope (SE) supernova (SN), iPTF13bvn (Type Ib), that occurred in the nearby galaxy NGC 5806. This SN was initially thought to have been the explosion of a very massive Wolf-Rayet (WR) star, but I have shown that this is very likely not the case. LÄS MER

5. 14. Studies on Potency and breadth of HIV-1, HIV-2 and SIV neutralizing antibody responses

   Författare :Gülsen Özkaya Sahin; Avdelningen för medicinsk mikrobiologi; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; HIV-1; HIV-2; SIV; envelope; neutralizing antibody; breadth; potency; IgG; IgA; complement; antibody-dependent complement-mediated inactivation; virus evolution; diversity; divergence;

   Sammanfattning : Even though the relative contribution of neutralizing antibodies (Nab) to prevent progression to AIDS during HIV-1 infection is still unclear, the induction of broadly NAb directed against HIV-1 through vaccination is considered to represent an important goal for the development of HIV-1 vaccines. Factors contributing to the induction of NAb may include the strength and duration of antigenic stimulation, the preservation of CD4+ T and B cells, the conformation of the HIV-1 envelope glycoprotein complex (Env), and the evolution of Env during infection. LÄS MER

7. 15. Creep modelling of particle strengthened steels

   Författare :Hans Magnusson; Rolf Sandström; Wolfgang Blum; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; creep rate modelling; particle hardening; microstructure evolution; dislocation climb; ferritic steels; Materials science; Teknisk materialvetenskap;

   Sammanfattning : Materials used in thermal power plants have to resist creep deformation for time periods up to 30 years. Material evaluation is typically based on creep testing with a maximum duration of a few years. This information is used as input when empirically deriving models for creep. LÄS MER