Sökning: "cold winters"

Visar resultat 1 - 5 av 42 uppsatser innehållade orden cold winters.

1. 1. Trends in mountain birch seed abundance and its relation to temperature and moth abundance: a ten-year study from Swedish Lapland

   Kandidat-uppsats, Göteborgs universitet / Instiutionen för biologi och miljövetenskap

   Författare :Frida Gustafsson; [2023-02-09]
   Nyckelord :Betula pubescens; climate change; seed production; Epirrita autumnata; Operophtera brumata; subarctic ecology; folivory; larval abundance;

   Sammanfattning : Boreal forest is the world’s largest terrestrial biome. Being one of the most ubiquitous and coldtolerant tree species in Sweden, the mountain birch forms a unique deciduous treeline and marks the forest-tundra ecotone. LÄS MER

3. 2. Evaluation of probabilistic forecasts in Uppsala and its potential use in winter road maintenance

   Master-uppsats, Uppsala universitet/Luft-, vatten- och landskapslära

   Författare :Elisabet Johansson; [2023]
   Nyckelord :forecast evaluation; ensemble system; MetCoOp; winter road maintenance; snow removal; utvärdering; ensembelprognos; MetCoOp; snöröjning; vinterväghållning;

   Sammanfattning : Efficient winter road maintenance is crucial for safety and societal function during the winter months in Sweden. This report aims to evaluate the MetCoOp ensemble system CMEPS and investigate its potential use as a basis for formulating criteria for snow removal that accounts for forecasted weather. LÄS MER

4. 3. Utvärdering av lastprognoser : En undersökning om lastprognoserna skapade till flexibilitetsmarknaden CoordiNet i Uppsala

   Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Elektricitetslära

   Författare :Emma Wiss; [2023]
   Nyckelord :Lastprognoser; Flexibilitetsmarknader; Kapacitetsbrist; Uppsala; Felkällor;

   Sammanfattning : The aim of the thesis was to evaluate the load forecasts used in the flexibility market CoordiNet, more specific the load forecasted used for Uppsala during the winters 2020-2021 and 2021-2022. The load forecasts are based on machine learning and to answer the aim of the thesis the following three research questions have been studied: what factors affect the load forecasting errors, which factors are important to increase the reliability of the load forecasts and how can Vattenfall Eldistribution evaluate load forecasts in the future. LÄS MER

5. 4. Korttidsprognoser av Kalixälvens vattenflöde

   Kandidat-uppsats, Lunds universitet/Statistiska institutionen

   Författare :Mathilda Carlsson; [2023]
   Nyckelord :ARIMA; RecursiveAR; forgetting factor; sliding window; Kalman filter; short-term predictions; water flows; Mathematics and Statistics;

   Sammanfattning : The Kalix River, located in the northern part of Sweden, experiences a slowdown in water flow during cold winters. However, in spring, when snow and ice melt in the mountains, the water flow starts to increase. Towards the end of spring, there is usually a rapid and unpredictable surge in water flow known as the spring flood. LÄS MER

7. 5. De krypande fruktträden - en historisk undersökning av odlingsmetoderna för krypande fruktträd under 1940-, 50-, och 60-talet

   Kandidat-uppsats, Göteborgs universitet/Institutionen för kulturvård

   Författare :Emma Grönlund; [2022-05-19]
   Nyckelord :Creeping apples; fruit trees; history of fruit trees;

   Sammanfattning : This bachelor's thesis is a study of the phenomenon “creeping fruit trees” and their methods for cultivation in the North of Sweden during the 1940s and 1950s. The cultivation of these trees were part of state experiments to find hardy fruit trees to replace approximately a quarter of the fruit trees in Sweden which froze to death during the cold winters of 1939-1942. LÄS MER