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- Abdelhameed, A. H., et al.
(author)
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Cryogenic characterization of a LiAlO2 crystal and new results on spin-dependent dark matter interactions with ordinary matter: CRESST Collaboration
- 2020
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In: European Physical Journal C. - : Springer Science and Business Media LLC. - 1434-6044 .- 1434-6052. ; 80:9
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Journal article (peer-reviewed)abstract
- In this work, a first cryogenic characterization of a scintillating LiAlO2 single crystal is presented. The results achieved show that this material holds great potential as a target for direct dark matter search experiments. Three different detector modules obtained from one crystal grown at the Leibniz-Institut fur Kristallzuchtung (IKZ) have been tested to study different properties at cryogenic temperatures. Firstly, two 2.8 g twin crystals were used to build different detector modules which were operated in an above-ground laboratory at the Max Planck Institute for Physics (MPP) in Munich, Germany. The first detector module was used to study the scintillation properties of LiAlO2 at cryogenic temperatures. The second achieved an energy threshold of (213.02 +/- 1.48) eV which allows setting a competitive limit on the spin-dependent dark matter particle-proton scattering cross section for dark matter particle masses between 350 MeV/c2 and 1.50 GeV/c2. Secondly, a detector module with a 373 g LiAlO2 crystal as the main absorber was tested in an underground facility at the Laboratori Nazionali del Gran Sasso (LNGS): from this measurement it was possible to determine the radiopurity of the crystal and study the feasibility of using this material as a neutron flux monitor for low-background experiments.
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- Abdelhameed, A. H., et al.
(author)
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First results from the CRESST-III low-mass dark matter program
- 2019
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In: Physical Review D. - 2470-0010 .- 2470-0029. ; 100:10
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Journal article (peer-reviewed)abstract
- The CRESST experiment is a direct dark matter search which aims to measure interactions of potential dark matter particles in an Earth-bound detector. With the current stage, CRESST-III, we focus on a low energy threshold for increased sensitivity towards light dark matter particles. In this paper we describe the analysis of one detector operated in the first run of CRESST-III (05/2016-02/2018) achieving a nuclear recoil threshold of 30.1 eV. This result was obtained with a 23.6 g CaWO4 crystal operated as a cryogenic scintillating calorimeter in the CRESST setup at the Laboratori Nazionali del Gran Sasso (LNGS). Both the primary phonon (heat) signal and the simultaneously emitted scintillation light, which is absorbed in a separate silicon-on-sapphire light absorber, are measured with highly sensitive transition edge sensors operated at similar to 15 mK. The unique combination of these sensors with the light element oxygen present in our target yields sensitivity to dark matter particle masses as low as 160 MeV/c(2).
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- Bertling Tjernberg, Lina, 1973, et al.
(author)
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Panel Session on Smart Grid in Europe
- 2013
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In: IEEE Conference publications on-line.
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Conference paper (other academic/artistic)abstract
- In Europe the climate goals expressed as 20/20/20 give main drivers for sustainable energy development – where smart grid is a facilitator to obtain these goals. Europe has been at the forefront of smart grid deployments especially in the areas of managing large penetration of renewable sources of energy, AMI and on advanced information technology. This panel gives examples from different smart grid deployments projects in Europe and lessons learned that can be applied for future deployments. The panel starts with a talk an advanced information technology and gives the answer to why Facebook has placed their server in Sweden.
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- Klomsri, Tina, et al.
(author)
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Poor Information Literacy Skills and Practices as Barriers to Academic Performance A Mixed Methods Study of the University of Dar es Salaam
- 2016
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In: Reference and user services quarterly. - : American Library Association. - 1094-9054 .- 2163-5242. ; 55:4, s. 293-305
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Journal article (peer-reviewed)abstract
- Information and Communication Technology (ICT) is increasingly used in Tanzanian education. Knowing how to operate ICT alone is incomplete without knowing how to use it as a tool for organization, communication, research, and problem-solving. In recognition of this challenge, information literacy (IL) has been identified as a key attribute to students as they progress through their learning paths. Based on a mixed methods strategy, using questionnaires and focus group discussions, this study measured the level of IL skills among University of Dar es Salaam’s (UDSM) postgraduate students, to gain insights into the students’ perceptions and experiences with information problems. A total of 102 students from four institutions answered the online questionnaire and 22 students participated in six focus group discussions. The questionnaire scores of the students were poor in the majority of IL categories, suggesting ineffectiveness of the current IL training in imparting IL knowledge and skills. The study ends by discussing recommendations to improve current IL practices at the university.
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