Sökning: "marine environments"

Visar resultat 16 - 20 av 142 avhandlingar innehållade orden marine environments.

1. 16. Environmental actions on concrete exposed in marine and road environments and its response - Consequences for the initiation of chloride induced reinforcement corrosion

   Författare :Anders Lindvall; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; corrosion; de-icing salt; road conditions; marine conditions; service life predictions; reinforcement; chloride; concrete; moisture conditions; environmental actions;

   Sammanfattning : The object of the study presented here has been to describe, further explain and model the influence of the exposure conditions on reinforced concrete structures and the consequences on their expected service life. The focus has been on investigating and quantifying the exposure conditions for structures in marine and road conditions exposed to chloride ions. LÄS MER

3. 17. Molecular detection of abundance and activity of marine, symbiotic, N2-fixing cyanobacteria

   Författare :Linnéa Ström; Rachel Foster; Daniel Lundin; Katharina Pawlowski; Rehab El-Shehawy; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Diatom Diazotroph Association; Richelia; Iron; Phosphorus; Nitrogen; nifH; pstS; exbB; rnpA; växtfysiologi; Plant Physiology; marinbiologi; Marine Biology;

   Sammanfattning : Marine primary productivity in large parts of the oceans is supported by nitrogen fixers (diazotrophs). Richelia, a genus of multiple closely related species of heterocystous filamentous cyanobacterial diazotrophs, are often found in symbioses with a few genera of diatoms. Several Richelia species: R. euintracellularis, R. LÄS MER

4. 18. Diel vertical migration in marine dinoflagellates

   Författare :Therese Jephson; Enhet akvatisk ekologi; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Key words: diel vertical migration; DVM; dinoflagellates; stratification; halocline; thermocline; behavior diel vertical migration; behavior;

   Sammanfattning : Increasing precipitation and surface water temperature due to global change may strengthen stratification in coastal regions, which could influence the behavior of dinoflagellate diel vertical migration (DVM). DVM is a behavioral mechanism by which dinoflagellates can access photosynthetically active radiation near the surface, and nutrients at depth. LÄS MER

5. 19. The Human Element in Marine Engine Department Operation: Human Factors & Ergonomics Knowledge Mobilization in Ship Design & Construction

   Författare :Steven Mallam; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Naval Architecture; Knowledge Transfer; Participatory Ergonomics; Work Environment; Marine Engineer;

   Sammanfattning : Physical environments influence how individuals perceive, behave and perform within an operational space and system. Marine engine department operations have dramatically developed from the initial introduction of ship mechanization in the nineteenth century, to ever increasing levels of computerized and automated functions today. LÄS MER

7. 20. On Evaluation of Working Conditions aboard High-Performance Marine Craft

   Författare :Pahansen de Alwis; Karl Garme; Anders Rosén; Joakim Dahlman; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; high-speed marine craft; human factors integration; whole-body vibration; epidemiology; musculoskeletal pain; fatigue; höghastighetsfartyg; human factors; HFI; helkroppsvibrationer; epidemiologi; muskuloskeletal smärta; utmattning; Vehicle and Maritime Engineering; Farkostteknik;

   Sammanfattning : High-Performance Marine Craft (HPMC) is a complex system confronted by the stochastic nature of the waves challenging the safety of life at sea. The personnel aboard these craft are vulnerable to detrimental conditions, in fact, limiting the system’s performance evoking the significance of the Human Factors Integration (HFI) in the design and operation of these craft. LÄS MER