Sökning: "key ages"

Visar resultat 21 - 25 av 68 avhandlingar innehållade orden key ages.

1. 21. Mark är som barn - Genus, fattigdom, och försörjning i Södra Wollo, Etiopien : [with English summary: Our land is like our children - Gendered livelihood strategies in South Wollo, Ethiopia]

   Författare :Kristina Nässén; Göteborgs universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; anthropology; gender; everyday practice; livelihood; exchange; female-headed households; subsistence farming; rural development; Ethiopian highlands; East Africa;

   Sammanfattning : This anthropological study examines the complexity and importance of gender relations for livelihood activities and it looks at the way in which female- headed agricultural households in the Ethiopian highlands cope in an area renowned for livelihood vulnerability, drought and famine. It is based on ethnographic fieldwork which was carried out in South Wollo for a year. LÄS MER

3. 22. Prodromal Cognitive Signs of Dementia

   Författare :Simona Sacuiu; Göteborgs universitet; []
   Nyckelord :cognitive function; mild cognitive impairment; prediction of dementia; Alzheimer s disease; vascular dementia; population study; birth cohort trends; terminal decline;

   Sammanfattning : The increase in proportion of elderly worldwide, coupled with the fact that increasing age is a primary risk factor for dementia, have fuelled the efforts to unveil the warning signs of dementia. Although important achievements have been made in this field during the last decades, many questions are still to be answered. LÄS MER

4. 23. Quaternary paleoceanography of the Arctic Ocean : A study of sediment stratigraphy and physical properties

   Författare :Emma Sellén; Martin Jakobsson; Jan Backman; Dorthe Klitgaard-Kristensen; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Arctic Ocean; sedimentology; Quaternary; stratigraphy; physical properties; Earth sciences; Geovetenskap; Quaternary geology; Kvartärgeologi; Sedimentology; Sedimentologi; Marine Geoscience; marin geovetenskap;

   Sammanfattning : A Quaternary perspective on the paleoceanographic evolution of the central Arctic Ocean has been obtained in this PhD thesis by studying sediment cores from all of the Arctic’s major submarine ridges and plateaus. The included cores were mainly recovered during the Healy-Oden Trans-Arctic expedition in 2005 and the Lomonosov Ridge off Greenland expedition in 2007. LÄS MER

5. 24. Star clusters as engines of galaxy evolution

   Författare :Mattia Sirressi; Angela Adamo; Matthew Hayes; Paul Crowther; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Extragalactic astronomy; Galaxies; Star formation; Interstellar medium; Stellar feedback; Ultraviolet surveys; Hubble Space Telescope; Spectroscopy; Data analysis; Astronomy; astronomi;

   Sammanfattning : Feedback in star forming galaxies is the key process that regulates how many stars form given the available gas reservoir. The radiation, energy and momentum released by the stellar activity and the active galactic nuclei change the physical properties of the gas in the galaxy such as the ionisation state, the density and the kinematics. LÄS MER

7. 25. Cost optimization of maintenance scheduling for wind turbines with aging components

   Författare :Quanjiang Yu; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Integer linear optimization; Age-based preventive maintenance scheduling; Renewal-reward theorem; Weibull distribution; Combinatorial optimization; Wind turbine maintenance; Virtual replacement; Condition monitoring data; Cox proportional hazards method; Linear programming;

   Sammanfattning : A major part of the wind turbine operation cost is resulted from the maintenance of its components. This thesis deals with the theory, algorithms, and applications concerning minimization of the maintenance cost of wind power turbines, using mathematical modelling to find the optimal schedules of preventive maintenance activities for multi-component systems. LÄS MER