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- Gustafsson, Fredrik, et al.
(författare)
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Uplink Load and Link Budget with Stochastic Noise Rise Levels in CDMA Cellular Systems
- 2004
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- The limiting factor in the uplink of all CDMA cellular systems is the relation between uplink noise rise and intended coverage. In link budgets, noise rise is usually simply handled as a constant contribution to the background noise in logarithmic scale, often referred to as interference margin. In practice, however, it is not constant. We model the uplink noise rise as a lognormal distribution, and investigate the impact to link budgets. Simulations and numerical calculations show that the uplink noise rise variance does not critically affect the uplink capacity and coverage. System feasibility and its relation to the uplink load is also discussed. It is shown that approximative load expressions provides an upper bound on the uplink load and therefore they can be used to imply system feasibility. Furthermore, the uplink load expressions provide accurate approximations of the load given that the load is within the practical limits given by the link budgets.
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- Kärrman, Erik, et al.
(författare)
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Forskning- och innovationsagenda för återvinning av näringsämnen ur avlopp
- 2020
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Research and Innovation Agenda for Recovery of Nutrients from WastewaterProjects funded on the topic of nutrient recovery and reuse in Sweden over the past years have been scattered, lacking a coherence in direction and coordination between the numerous research funding organizations. This agenda has been developed with the purpose of creating a framework and common understanding of what research and innovation is necessary to move forward in a transition to a circular nutrient economy. The goal was to identify and prioritize the R&I needs in order to enable a productive dialogue between investors, researchers and other crucial societal actors including organizations, the public sector and the industry.The results and conclusions presented in this report are mainly drawn from a workshop in September 2019, with around 40 participants representing the water and wastewater sector, municipalities, academia, the agricultural sector, the industry and Swedish national agencies.In the transition to a more circular management of nutrients including waste streams, several challenges were identified. The identified challenges in a nutshell:- Current system solutions are not optimized, there is a lack of holistic approach- Business models and incentives to choose products based on recovered nutrients on the market are missing- Technology needed for circular management of nutrients are in general on a low technology readiness level- Recovered nutrient products must maintain a uniform and high quality in order to compete on the market and the requirements should be the same for all fertilizers.The agenda concludes that the research and innovation actions to meet the challenges should follow a holistic approach that includes the entire value chain of nutrient management in the food system. All essential nutrients in the food system and other resources in its waste streams should be considered, to maximize efficient and circular nutrient management. Based on this understanding, that a holistic approach is of such importance to target the identified challenges, the research and innovation needs were identified as:- Develop a national plant nutrient management strategy that describes holistically how to manage nutrients overall in a circular economy- Develop goals and targets for nutrient recovery from wastewater based on this nutrient management strategy (the Swedish inquiry on sludge management suggested a requirement of 60 % phosphorus recovery from wastewater treatment plants, this should just be the beginning and goals should also be set for other nutrients)- A larger interdisciplinary R&I effort regarding the recovery goals should be coordinated to analyze how the transition to a circular management of nutrients best can be accomplished on a systems level- Provide support to develop business models for optimal collaboration between different actors in different parts of the value chain and maximized resource efficiency- Technology development and demonstrations aligned with the holistic approach for circular management of nutrients in the suggested national nutrient management strategy
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- Lundberg, Erik, Associate Professor, PhD, 1980-, et al.
(författare)
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Kan deltagande i skolval stärka ungas delaktighet i demokratin?
- 2023
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Rapport (populärvet., debatt m.m.)abstract
- Skolval arrangeras regelbundet på Sveriges gymnasie- och högstadieskolor för att ge elever möjlighet att ta ställning till, och rösta på ett politiskt parti. Syftet är att stärka elevers delaktighet i demokratin till exempel genom att motivera elever att lära sig mer om partier och politik, och att stärka ett aktivt medborgarskap. Men vilken betydelse har deltagande i skolval för elevers delaktighet i demokratin? Den här policy briefen redovisar resultat från en analys av i vilken mån deltagande i skolval bidrar till att främja ungas förutsättningar att delta i demokratin. Policy briefen är skriven av Erik Lundberg, docent i statsvetenskap vid Högskolan Dalarna i samarbete med Hanna Lundin, mastersstudent i internationell och jämförande utbildning vid Stockholms universitet. Resultaten baseras på den utvärdering av Skolval 2022 som har genomförts av Myndigheten för ungdoms- och civilsamhällesfrågor (MUCF).
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| 7. |
- Magnusson, Sven Erik, et al.
(författare)
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Slutredovisning från projekten "Brandteknisk dimensionering baserad på beräkning" (SBUF) och "Funktionsbaserad brandteknisk dimensionering" (Branndforsk)
- 1997
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- This is a summary report of two integrated three year projects "Fire safety design based on calculations" and "Performance based fire safety design". The total project has been subdivided into several part projects: general principles for risk assessment, evacuation safety of public buildings, hotels and health care buildings, calculation of safety factors, calculation of model uncertainties, uncertainties in input data. A kcy concept has been analysis of uncertainty. Two main risk assessment methods have been studied: the reliability index ß method and the event-tree evaluation method. The study has demonstrated and illustrated the practical application of basic risk and assessment methods and provided the foundation for a general design methodology based on performance and the concept of risk.
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