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Sea Trials of a Wave Energy Converter in Strangford Lough, Northern Ireland

Journal of Shipping and Ocean Engineering 2013年第1期3卷 11-20页

作者： Vladimir Krivtsov Ian Bryden brian linfoot obin Wallace The University of Edinburgh Kings Buildings Edinburgh EH9 3JN Scotland UK SBE Heriot-Watt University Edinburgh EH14 4AS UK Department of Ecology Kharkov State University 4 Svobody Square Kharkov 310077 USSR Ukraine

This paper describes a campaign of WEC （wave energy converter） testing and presents a selection of the results related to the measured motions and mooring tensions. A 1：20 physical model has been successfully deployed using a three point mooring installed at sea （Strangford Lough, NI） in 10 m depth. In calm weather the overall dynamics of mooring tensions is dominated by the tidal cycle due to the progressive lifting of the heavy chain with the increase in water depth on the flood and gradual lowering on the ebb. In flesh winds the dynamics is very complex, but can be studied with the aid of mathematical modelling. A simulation model was used to assess the dynamics of the mooring lines, and the results of open water tests have been compared with the model＇s performance. The results indicate that, in general, the model shows a reasonable agreement with the observations. The WEC＇s motions and the measured loads on the leading mooring line appear to relate to the concurrent environmental conditions. The data obtained can therefore be used for the model＇s calibration and further improvements, which is valuable for improving the WEC＇s design and operational characteristics. This may be important not only in relation to the issues of reliability and power take off, but also in terms of minimising the adverse effects of mooring lines on bottom sediments, as well as indirect effects of the eroded particles on a wide range of aquatic processes.

关键词： Bottom sediments mooring loads meteorological data model simulations optimisation Orcaflex CRESS wind waves.

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Effects of the shape and size of a mooring line surface buoy on the mooring load of wave energy converters

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Journal of Chongqing University 2012年第1期11卷 1-4页

作者： KRIVTSOV Vladimir linfoot brian HARRIS Robert E. School of Built Environment Heriot-Watt UniversityEdinburgh EH14 4ASUnited Kingdom

This paper describes the physical model testing of a wave energy converter (WEC) undertaken in the Heriot-Watt wave basin during October 2010 as part of the SUPERGEN2 project funded by the British government,and provides a preliminary analysis of the extreme mooring *** were completed at 1/20 scale on a single oscillating water column device deployed with a 3-line taut mooring *** model was fully instrumented with mooring line load cells and an optical motion *** tests were preceded by calibration of instrumentation and the wave test environment,and carried out in long crested waves regimes with 12 combinations of peak period T p and significant wave height H *** main objective for these experiments was to examine the effect of shape and size of the tethered buoy on the leading mooring line on the maximum mooring loads and the excursion of the *** of the loads at different configurations of the tethered buoy suggests that the results are consistent with the hypothesis that the mooring forces should depend on the change in stiffness of the mooring *** particular,the results indicate that with the spectral peak period close to the natural period of the moored device of 8 s,peak loads in a configuration with a smaller buoy may be considerably higher than those with a larger ***,when T p was dissimilar,a harder mooring with a smaller spherical buoy appears to result in lower peak *** exact configuration should,therefore,be chosen according to the prevalent conditions of any particular location,and will also depend on the design and expected maintenance schedule,as well as matters related to the risk to navigation,environmental effects and the conservation status of the area.

关键词： mooring load wave energy converter spherical buoy

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Effect of the Technological Status of Small Cow-Calf Farm Producers on the Induction to Resumption of Ovarian Activity of Dual-Purpose Cattle Raised under Topical Conditions

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Open Journal of Veterinary Medicine 2020年第11期10卷 195-205页

作者： Henry Velázquez Penagos Leticia Galindo Rodríguez Manuel Barrientos Morales Carlos Salvador Galina Hidalgo Martín Guillermo Maquivar linfoot Felipe Montiel Palacios Departamento de Reproducción Facultad de Medicina Veterinaria y Zootecnia UNAM CDMX México Centro de Enseñ anza Investigación y Extensión en Ganadería Tropical Facultad de Medicina Veterinaria y Zootecnia Universidad Nacional Autónoma de México Martínez de la Torre Veracruz México Facultad de Medicina Veterinaria y Zootecnia Universidad Veracruzana Veracruz México Department of Animal Sciences Washington State University Pullman Washington DC USA

The aim of the present study was to evaluate the impact of the technological level in small-scale dual-purpose cow-calf Bos indicus female operations on the resumption of the ovarian activity post-partum. A total of 13 small scale dual-purpose Bos indicus × Bos taurus operations were included in this experiment and they were classified according to their technological status as: high technological status (HT), medium technological status (MT) and low technological status (LT). Ninety-three mature cows were treated with either a CIDR (controlled internal drug release device) with estradiol benzoate (CIDR+EB) or alone (CIDR). At day 9 all animals received intravaginally a CIDR for nine days. At day 0, the CIDR was withdrawn and 24 hours later one dose of estradiol benzoate was administered to 51 cows (17 in HT, 17 in MT and 17 in LT), the remaining animals (n = 42) did not receive the estradiol benzoate administration (14 in HT, 13 in MT and 15 in LT). Comparisons were performed on serum progesterone concentrations after CIDR treatment. By day 7 after implant withdrawal, the proportion of cows that resume ovarian activity detected by progesterone concentration increased in all technological level farms, no statistical main effect was observed within technological level. By day 17 there was a significant main effect of technological level (P = 0.05) on the proportion of animal that resumed the estrous cycles, but neither a main effect of treatment (P = 0.97) nor an interaction between technological level and treatment (P = 0.98). Furthermore, technological level of the farm showed a tendency (P = 0.07) to affect that resume the estrous activity, and a significant effect of treatment was observed (P = 0.005) but no interaction between technological level and treatment. The proportion of cows that showed estrus was different across technological level (P = 0.02), the highest proportion of cows showing estrus regardless of treatment was in the H

关键词： Cattle Ovulation Technological Level Small Cow-Calf Farm Producers

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