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Desta Mebratu om vikten av energiforskning – Energi har alltid spelat en central roll i de sociala transformerande förändringarna i mänsklighetens historia. Gästforskaren Desta Mebratu arbetar med temat Energy Justice. Han är ansluten till Stellenbosch unversitetet som Extra Ordinary Associate Professor, Center for Complex Systems in Transition, School of Public Leadership. Innan det var han vice

https://www.pi.lu.se/sites/pi.lu.se/files/tv_energy_justice_desta_mebratu.pdf - 2026-06-28

Solar cells based on conjugated polymer and fullerene blends have been developed as a low-cost alternative to silicon. For efficient solar cells, electron-hole pairs must separate into free mobile charges that can be extracted in high yield. We still lack good understanding of how, why and when carriers separate against the Coulomb attraction. Here we visualize the charge separation process in bul

New data shows that there is genetic continuity between the Scandinavian Mesolithic Ertebølle culture and the Scandinavian Neolithic Pitted Ware culture. To examine whether it is possible to demonstrate the continuity in other aspects than the genetic, this paper examines graves from three Mesolithic grave fields (Skateholm I & II and Vedbæk) and two Neolithic grave fields (Ajvide and Västerbj

This thesis is an explorative note on the non-Gaussian innovations of the volatility process. More specifically, the thesis investigates if the decomposition of the Standard Classical Laplace (SCL) distribution to a difference of two exponential is a valid alternative to modelling the asymmetric volatility processes, taking volatility clustering, the leverage effect and asymmetric response in vola

Since 1999, the World Bank (WB) and the International Monetary Fund (IMF) encourage developing countries to prepare the so called poverty reduction strategies (PRSs), which are national integrated strategies formulated through a participatory process coordinated with donors. This research has aimed to contribute to the development of effective PRS, especially the Sustainable Development and Povert

The purpose of this report was to bring together the subjects of innovation and social media to demonstrate that the potential of an innovation process in social media is huge and possibly underutilized, especially for Swedish small and medium-sized enterprises. The report provides an overview of innovation and social media. A literature review and a case study were conducted to examine how social

Kraven gällande maximalt tillåtna gångavstånd till en utrymningsväg saknar förmodligen en direkt vetenskaplig grund. De är dock resultatet av många års byggande där historien visat vad som fungerat. Exakt vad som givit upphov till gångavstånden är fortsatt okänt och det skulle således kunnat vara en praktisk fråga gällande vad som var möjligt att bygga, lika väl som hur stora avstånd städpersonal The allowed travel distance has probably not been determined scientifically. Yet it indirectly takes a number of factors into account and should therefore not only be seen as a distance that takes a certain time to walk, but also as a certain level of safety. Longer travel distances do extend the walking time but it also makes it possible for a series of factors to increase the risk. The factors t

Gruvdrift i yttre rymden har under de senaste åren vuxit fram som en reell möjlighet. Privata företag ligger i bräschen med att utveckla ny teknik för att uppnå utnyttjandet av resurser i yttre rymden. De rättsliga förutsättningarna är fortfarande ett hinder för sådana aktiviteter då de stora rymdfördragen inte uttryckligen förbjuder eller tillåter det. Problemet kring denna typ av gruvdrift har aMining in outer space has in recent years emerged as a real possibility. Private companies are at the forefront of developing new technology to achieve the exploitation of resources in outer space. The legal conditions are still a barrier because of that the large space treaties do not expressly prohibit or allows such a venture. The problem surrounding this type of mining has materialized even mo

The ultrafast energy transfer among the pigments of the B800-850 membrane antenna pigment-protein complex of the photosynthetic purple bacteria Rhodobacter sphaeroides and Rhodopseudomonas palustris LL has been studied with ≈ 100 fs tunable infrared pulses at room temperature and 77 K. It is shown that the B800→B850 transfer time is similar in both species and occurs with a characteristic time con

This paper is concerned with sigma-point methods for filtering in nonlinear systems, where the process and measurement noise are heavy tailed and enter the system non-additively. The problem is approached within the framework of assumed density filtering and the necessary statistics are approximated using sigma-point methods developed for Student's t-distribution. This leads to UKF/CKF-type of fil

Introduction: This multicenter, prospective observational study aimed to evaluate the performance of the StatStrip® Lactate 2 (Nova Biomedical, Waltham, US) point-of-care device for fetal blood lactate measurement and to determine the corresponding lactate value equivalent to the established intervention cutoff used with the outgoing StatStrip® Lactate device. Material and Methods: The study was c

Inom beredskapen mot radiologiska och nukleära olyckor och katastrofer spelar strålningsmätningar en avgörande roll för att ta reda på vad som har hänt och hur farligt det är för människa, djur och natur och på vilket sätt det påverkar miljö och samhällsfunktioner. I Sverige och många andra länder i världen har allmänheten en rättighet att få reda på vad som hänt och vad de utsätts för i ett eventThis thesis describes investigations made on mobile and stationary gammaspectrometry made both under laboratory conditions and in situ. The objective hasbeen to identify and quantify radionuclides in the form of point sources,contamination and widespread deposition in situations where the measurementgeometry is not known beforehand. Both scintillators and semiconductor detectors ofsimilar size wer

Lead-based perovskite nanocrystals (NCs) have outstanding optical properties and cheap synthesis conferring them a tremendous potential in the field of optoelectronic devices. However, two critical problems are still unresolved and hindering their commercial applications: one is the fact of being lead-based and the other is the poor stability. Lead-free all-inorganic perovskite Cs3Bi2X9 (X=Cl, Br,

Motivation: Multimillion-probe microarrays allow detection of gains and losses of chromosomal material at unprecedented resolution. However, the data generated by these arrays are several-fold larger than data from earlier platforms, creating a need for efficient analysis tools that scale robustly with data size. Results: We developed a new aberration caller, Ultrasome, that delineates genomic cha