Filtyp
The transport of PCBs (Aroclor 1242) in a river system in southern Sweden was governed by outflow from sediment in a 26-ha contaminated lake. Experiments in the lake revealed that 14 g PCBs/d escaped from the sediment, while sedimentation was 3 g PCB/d. Volatilization of PCBs from the lake surface was 0.02 g/d, which was considerably higher than the atmospheric fallout . The majority of the sedime
An inverse source problem associated with a semi-linear transport or one-way wave equation in one spatial dimension is considered. It is shown an analytic solution to the inverse problem can be given and furthermore, that this inverse problem of determination of a source function is ill-posed, and must be regularised. A novel regularisation scheme which combines least squares monotone approximatio
Forskare Kontaktinformation E-post: tomas [dot] naeraa [at] mgeo [dot] lu [dot] seOrganisation Miljö- och geovetenskapliga institutionen (MGeo) Hämtställe: 16 WebbplatsTomas Naeraas profil i Lunds universitets forskningsportalMy research interests focuses on crust forming processes in the Archaean aeon, and on igneous and metamorphic processes in orogens. I work with petrography, geochemistry, iso
https://www.geologi.lu.se/tomas-naeraa - 2026-07-16
Industry involvement in open source software development has become a popular practice among companies which, e.g., share software development costs with other community participants or implement an open source based business model. An increased understanding of the underlying development structure, especially in a case where the community participants are composed of competing industry members, c
The use of laser based plasma x-ray sources (LPXS) has quickly expanded during the past decades due to rapid development of ultrafast laser systems. These sources are used in many research applications such as emission, absorption and particularly time-resolved spectroscopy. From the LPXS x-ray pulses are generated when an intense laser pulse is focused onto a liquid or solid interface in gas or v
Popular Abstract in Swedish I denna avhandling presenteras en ny typ av röntgenkälla baserad på ett laser-producerat plasma. Röntgenstrålning alstras genom att fokusera laserpulser på ett strålmål. Energin i de enskilda laserpulserna blott är cirka 150 mJ, men tack vare den extremt korta pulstiden 100 fs (10E-13 s), blir laserns toppeffekt mer än 1 TW (10E12 W). Den extremt intensiva laserstrålninA laser-produced plasma was generated by focusing 100 fs laser pulses, with an energy of 150 mJ, onto metal targets. The laser intensity was expected to reach 10E17 W/cm2. Radiation was emitted from the created plasma, with photon energies extending up to the MeV regime. The laser-based X-ray source was optimised, with the purpose of making it a realistic source of hard X-rays (>10 keV). Dedicated
The effect of relic gravitational waves on the polarization of the CMB is analytically studied. The equation of radiative transfer for the polarization is transformed into two coupled differential equations by Polnarev's method and an approximate solution is derived.
