6篇
您的检索式：作者名="David FREDRIKSSON"
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| 1 | Experimental Study of An Aquaculture Net Cage in Waves and Current显示文摘Model experiments of a floating fish cage subjected to waves and current have been performed. The objective was to study the dynamic behaviour of the fish cage model in waves and current. The fish cage model was composed of a model net, a flexible floating collar of the circular plastic type and a weight system. It was found that there are many wave periods in which cancellation of the wave-induced forces on the model occur. These cancellation wave periods are within the range of dimensioning wave periods commonly used for testing of fish farm structures and hence are important to be aware of. Large deformations of the net under realistic wave and current conditions were observed, where contact between the net and other parts of the structure were identified. This may cause damages to the net due to abrasion. | David KRISTIANSEN Pal LADER Фsten JENSEN David FREDRIKSSON | 2015 | China Ocean Engineering2015，29，3： | 2 |
| 2 | Drag on Hydroid-Fouled Nets – An Experimental Approach显示文摘The present study investigated the drag increase on aquaculture nets due to biofouling of the colonial hydroid Ectopleura larynx. It had two main parts: firstly the growth characteristics of E. larynx were investigated by use of field tests at a Norwegian aquaculture site; secondly the hydrodynamic drag on the fouled twines was studied in a towing tank by using fabricated models of net twines with artificial hydroid fouling. In the field tests, the growth of the hydroids was first measured after three weeks of immersion and then again after six weeks. During this interval, the density of hydroids and the thickness of the hydroid stem were almost constant(1.4 hydroids/mm and 0.29 mm, respectively), while the average length of the hydroids increased from 6.4 to 11.2 mm. The hydroid length followed a Rayleigh distribution, while the thickness was normal(Gaussian) distributed. Replicas of twines with three different levels of hydroid growth were made(1.5 hydroids/mm twine, hydroid length 9 mm, 16 mm and 20 mm), and the drag on these twines was measured at different towing velocities(0.1 to 1.4 m/s) and with different twine configurations. For the twine with the shortest hydroids(9 mm), the drag was from 1.5 times(Re=4000) to 2.2 times(Re=1000) the drag on a clean twine. For the longest hydroids(21 mm), the drag was 2 times and 3.8 times, respectively. | Pl LADER David W. FREDRIKSSON Jana GUENTHER Zsolt VOLENT Nina BLOCHER David KRISTIANSEN Lars GANSEL Jud DECEW | 2015 | China Ocean Engineering2015，29，3： | 1 |
| 3 | Finite element modeling of net panels using a consistent net element显示文摘 | IGOR Tsukrov OLEG Eroshkin DAVID Fredriksson | 2003 | Ocean Engineering2003，，30： | 1 |
| 4 | Development of structural modeling techniques for evaluating HDPE plastic net pens used in marine aquaculture显示文摘 | David W. Fredriksson Judson C. DeCew Igor Tsukrov | 2007 | Ocean Engineering2007，，16： | 1 |
| 5 | There exist at least 30 human G-protein-coupled receptors with long Ser/Thr-rich N-termini显示文摘 | Robert Fredriksson David E.I. Gloriam P?r J. H?glund Malin C. Lagerstr?m Helgi B. Schi?th | 2003 | Biochemical and Biophysical Research Communications2003，，3： | 1 |
| 6 | Seven evolutionarily conserved human rhodopsin G protein-coupled receptors lacking close relatives显示文摘 | Robert Fredriksson David E I Gloriam | 2003 | FEBS Letters2003，554，： | 1 |
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