<p>The material consumption of the foundation of a WEC is a big part of the totalmaterial consumption of the entire power plant. To reduce these consumption, it isrequired to optimize the foundation. To find out how small the foundation could beconstructed and still be able to cope with the requirements, it is necessary to knowabout the various forces that affects the foundation. The focus in this thesis is on theforces acting on the buoy. The forces are calculated theoretical with experimentsconducted to reach conclusions about the size of the gravity foundation.Experiments will also be conducted to investigate experimentally whether there is anydifference between the suction force of sand and clay soil.Results from experiments with buoys show that the theoretical calculations arereasonably close with results from experiments. Conclusion of the differencesbetween theory and experiment is found that this may be due to the wave tank abilityto reproduce waves, and the angle between the buoy and the wave direction.Results from experiments of the suction force shows that there is no differencebetween sand and clay. The conclusion from this experiment is that the results applyonly to the clay that was investigated in this experiment and cannot be compared withother clay types with different properties.A discussion about the foundations is carried out where the conclusion is drawn thatthe foundations for the minimum mass to maintain equilibrium at 4 m wave height isapproximately 33 ton.</p>

The material consumption of the foundation of a WEC is a big part of the totalmaterial consumption of the entire power plant. To reduce these consumption, it isrequired to optimize the foundation. To find out how small the foundation could beconstructed and still be able to cope with the requirements, it is necessary to knowabout the various forces that affects the foundation. The focus in this thesis is on theforces acting on the buoy. The forces are calculated theoretical with experimentsconducted to reach conclusions about the size of the gravity foundation.Experiments will also be conducted to investigate experimentally whether there is anydifference between the suction force of sand and clay soil.Results from experiments with buoys show that the theoretical calculations arereasonably close with results from experiments. Conclusion of the differencesbetween theory and experiment is found that this may be due to the wave tank abilityto reproduce waves, and the angle between the buoy and the wave direction.Results from experiments of the suction force shows that there is no differencebetween sand and clay. The conclusion from this experiment is that the results applyonly to the clay that was investigated in this experiment and cannot be compared withother clay types with different properties.A discussion about the foundations is carried out where the conclusion is drawn thatthe foundations for the minimum mass to maintain equilibrium at 4 m wave height isapproximately 33 ton.

A two part study of hydrocarbon utilization by microorganisms was undertaken. In the first part it was decided to attempt the genetic transformation of Bacillus subtilis with respect to the ability to grow on hydrocarbon carbon source. One hundred forty-four cultures of Bacillus organisms were isolated on a medium with refined kerosene as the sole carbon source. Most of these cultures were found to be B. cereus (92 isolates), B. lentus or B. firmus (15 isolates) and B. megaterium (8 isolates). Neither of the 2 strains identified as B. subtilis were capable of sufficient growth on kerosene medium, even with complex supplements added, to warrant a transformation experiment. In the second part of this study, a culture which was classified as a member of the genus Arthrobacter was investigated for its ability to grow rapidly on hydrocarbons. Dodecane was shown to be the n-alkane utilized most readily. The acidity produced by this culture was not due to formation of fatty acids, other organic acids or amino acids and was attributed to the acidity generated by utilization of the ammonium nitrogen source. When grown in a fermentor with pH control, the Arthrobacter spp. oxidized ammonia forming nitrate and nitrogen oxide gases when the dodecane carbon source was exhausted. This is the first time ammonia oxidation has been reported in an n-alkane fermentation system. / Land and Food Systems, Faculty of / Graduate

Th.--Sci.--Bordeaux 1, 1980. N°: 655.

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