Search for dissertations about: "PAR"

Showing result 1 - 5 of 411 swedish dissertations containing the word PAR.

2. 1. Mapping Primary Production for the West African Sahel with Satellite Data

   Author : Jonathan Seaquist; Institutionen för naturgeografi och ekosystemvetenskap; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Physical geography; Sahel; CENTURY; Monte Carlo; GPP; transpiration; LUE; CLAVR; PAR; compositing; MVC; geostatistics; noise; NDVI; NOAA AVHRR; geomorphology; pedology; cartography; climatology; Fysisk geografi; geomorfologi; marklära; kartografi; klimatologi;

   Abstract : A light Use Efficiency (LUE) model is developed that allows the mapping of total growing season Gross Primary Production (GPP) for the West African Sahel, using the Normalized Difference Vegetation Index (NDVI) together with other data. Image quality may be poor in monthly NDVI maximum value composites as shown by an improved geostatistical noise estimation technique. READ MORE

4. 2. Peak and Power Reduction in Multicarrier Communication Systems

   Author : Niklas Andgart; Institutionen för elektro- och informationsteknik; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Telekommunikationsteknik; line driver; Signal processing; Signalbehandling; Telecommunication engineering; power reduction; DSL; DMT; tone reservation; PAR; Peak to average ratio;

   Abstract : Broadband multicarrier communication suffers from a large signal span, causing problems in both wireless and wireline systems. This is commonly referred to as a high peak to average ratio (PAR), and leads to a high power consumption, which is an important limitation in many communication systems. READ MORE

5. 3. Designing Community Economies : Exploring Alternatives for Infrastructuring Food Waste Activism

   Author : Katie Berns; Chiara Rossitto; Jakob Tholander; Danielle Wilde; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Digital Civics; Food-Sharing; Activism; Food Waste; Community Economies; PAR; informationssamhället; Information Society;

   Abstract : By drawing on past CSCW and SHCI scholarship engaged with how technology can support the collaborative work of organising activism and empowering people to respond to diverse sustainability challenges– my research contributes to the emerging field of digital civics by introducing the human geography concept ‘community economies’ as a new way to frame and determine the scope of the design of digital technologies for infrastructuring food waste activism. Using a combination of ethnographic research and participatory action research (PAR), the empirical data were collected through two long-term collaborations with food-sharing communities in Denmark and Sweden and through a collaboration with researchers on a related project that focused on a food-sharing community in Germany. READ MORE

6. 4. A green future with thawing permafrost mires? : a study of climate-vegetation interactions in European subarctic peatlands

   Author : Julia Bosiö; Institutionen för naturgeografi och ekosystemvetenskap; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Fennoscandia; carbon; greenhouse gas; photosynthesis; PAR; snow; climate change; permafrost; peatland; subarctic;

   Abstract : Climate projections indicate that Arctic and sub-Arctic regions are facing a significant change in climate during the 21st century. With warmer temperatures precipitation is also expected to increase, and in particular winter precipitation. READ MORE

7. 5. Vegetation and climate during Weichselian ice free intervals in northern Sweden : Interpretations from fossil and modern pollen records

   Author : Martina Hättestrand; Ann-Marie Robertsson; Donatella Magri; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Weichselian; interstadial; stadial; glacial history; northern Sweden; Tärendö; Riipiharju; Rissejauratj; Veiki moraine; pollen analysis; pollen deposition; pollen trap; PAR; Quaternary geology; Kvartärgeologi;

   Abstract : In this thesis the Weichselian history of northern Sweden is investigated, with emphasis on vegetation and climate during ice-free intervals. The main method used has been pollen analysis of sediments from pre-Late Weichselian landforms. To interpret fossil pollen assemblages, comparisons with modern pollen spectra were made. READ MORE