Sökning: "pollen"

Visar resultat 1 - 5 av 174 uppsatser innehållade ordet pollen.

  1. 1. Insect pollination of faba beans, Vicia faba : the abundance and foraging behaviour of different pollinators and their effect on crop yield

    Kandidat-uppsats, SLU/Dept. of Ecology

    Författare :Ylva Johansson; [2020]
    Nyckelord :honeybee; Apis mellifera; bumblebees; B. pascuorum; B. hortorum; B. lucorum; B. terrestris; B. ruderatus; B. cryptarum; B. distinguendus; B. lapidarius;

    Sammanfattning : Faba beans, Vicia faba is known as a self-pollinating crop, however significant yield increases have been found in plants visited by honeybees and bumblebees. The bees either make positive visits, entering the flower and transferring pollen between different flowers resulting in cross-pollination, or negative visits, piercing the flower to “steal” nectar or collect nectar from extrafloral nectaries. LÄS MER

  2. 2. Secondary aerosol formation from dimethyl sulfide - Smog chamber experiments and detailed process modelling

    Kandidat-uppsats, Lunds universitet/Kärnfysik; Lunds universitet/Fysiska institutionen

    Författare :Dana Lüdemann; [2020]
    Nyckelord :aerosol modelling; atmospheric physics and chemistry; marine aerosols; ADCHAM; aerosol; dimethyl sulfide; Physics and Astronomy;

    Sammanfattning : The aim of this thesis was to investigate the secondary aerosol formation from dimethylsulfide (DMS) using the aerosol dynamics, gas- and particle-phase chemistry kinetic multi-layer model, ADCHAM. The first simulations, concerning the butanol oxidation via hydroxyl radicals (OH), were performed to characterize the UV-light source of the AURA smog chamber (Aarhus university, Denmark), later used for the DMS experiments. LÄS MER

  3. 3. Gestaltningsförslag av utemiljö vid Villa Roos Park : med stöd av evidensbaserad design i vårdsammanhang

    Kandidat-uppsats, SLU/Department of Work Science, Business Economics, and Environmental Psychology

    Författare :Åsa Nilsson; [2020]
    Nyckelord :bekväm design; evidensbaserad design; hälsoträdgård; salutogens; sinnesträdgård; stimulerande design; terapeutisk trädgård; trädgård i vård;

    Sammanfattning : I det här examensarbetet undersöks hur en avgränsad del av utemiljön vid Vardaga Villa Roos Park (i regi av omsorgsföretaget Vardaga, fortsättnings vis benämnt Villa Roos Park), ett särskilt boende för personer med demenssjukdom, kan utvecklas med stöd av EBD, evidensbaserad design av utemiljöer i vårdsammanhang (Bengtsson et al., 2018). LÄS MER

  4. 4. Competition between wild bees and manged honeybees : a review of floral preferences

    Kandidat-uppsats, SLU/Dept. of Animal Environment and Health

    Författare :Charlotte Hansson; [2020]
    Nyckelord :honeybees; competition; solitary bees; displacement;

    Sammanfattning : The decline of wild pollinators has given ground for a debate on the effects of managed honeybees to wild populations. Even though honeybees are native to some areas, management and domestication has had an indisputable effect on their foraging behaviour and thus the potential effect on surrounding taxa. LÄS MER

  5. 5. Self-adaptive random walk with pesudo-gradients for genetic evolution of an artificial neural network

    Master-uppsats, Lunds universitet/Beräkningsbiologi och biologisk fysik

    Författare :Robin Emanuelsson; [2020]
    Nyckelord :Physics and Astronomy;

    Sammanfattning : To optimize the weights in an artificial neural network most methods rely gradients, which are not always obtainable or desirable. Evolutionary algorithms are instead based on Darwinian evolution where no derivative is needed. LÄS MER