Sökning: "Ants"

Visar resultat 16 - 20 av 30 avhandlingar innehållade ordet Ants.

1. 16. Attract, reward and disrupt: combining habitat manipulation and semiochemicals to enhance pest control in apple orchards

   Författare :Joakim Pålsson; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
   Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

   Sammanfattning : Agricultural intensification entails negative effects on natural enemy populations and the pest regulation services they provide. Habitat manipulation holds potential to control pests with less negative effects on the environment than conventional methods. LÄS MER

3. 17. Attraction Based Models of Collective Motion

   Författare :Daniel Strömbom; David J. T. Sumpter; Andreas Deutsch; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; flocking; swarming; self-propelled particles; alignment-free models; agent-based modelling; leaf-cutting ant traffic; sheep-sheepdog system; the Shepherding problem; Mathematics with specialization in Applied Mathematics; Matematik med inriktning mot tillämpad matematik;

   Sammanfattning : Animal groups often exhibit highly coordinated collective motion in a variety of situations. For example, bird flocks, schools of fish, a flock of sheep being herded by a dog and highly efficient traffic on an ant trail. LÄS MER

4. 18. Legofolk : drängar, pigor och bönder i 1700- och 1800-talens Sverige = Farm servants and peasants in 18th and 19th century Sweden

   Författare :Börje Harnesk; Umeå universitet; []
   Nyckelord :HUMANIORA; HUMANITIES; Farm servants; peasantry; patriarchalism; Sweden; 18th and 19th century;

   Sammanfattning : The institution of farm service was mainly a West-European phenomenon. It was linked to the high age at marriage and it was an important system for the distribution of labour in agriculture.In Sweden, the use of farm servants in peasant agriculture intensified in the 18th century and remained important up till the advent of industrialization. LÄS MER

5. 19. Reinforcement in Biology : Stochastic models of group formation and network construction

   Författare :Qi Ma; David Sumpter; Edward Codling; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; reinforcement in biology; merge and split model; preferential attachment; reinforced random walk; network construction; shortest path problem; transport networks; ant algorithm; slime mould; physarum polycephalum; speed-accuracy tradeoff.; Mathematics with specialization in Applied Mathematics; Matematik med inriktning mot tillämpad matematik;

   Sammanfattning : Empirical studies show that similar patterns emerge from a large number of different biological systems. For example, the group size distributions of several fish species and house sparrows all follow power law distributions with an exponential truncation. LÄS MER

7. 20. Mathematical modelling approach to collective decision-making

   Författare :Natalia Zabzina; Denis Gaidashev; Torbjörn Lundh; Uppsala universitet; []
   Nyckelord :collective behaviour; collective decision-making; communication mechanisms; positive feedback; mathematical modelling; bifurcation phenomena; steady state solutions; symmetry breaking; symmetry restoring; diffusion-limited aggregation; fractal dimension;

   Sammanfattning : In everyday situations individuals make decisions. For example, a tourist usually chooses a crowded or recommended restaurant to have dinner. Perhaps it is an individual decision, but the observed pattern of decision-making is a collective phenomenon. LÄS MER