نتایج جستجو برای: boat

تعداد نتایج: 9115  

2008
LAIRD A. HENKEL

We compared density estimates for marine birds off central California from simultaneous aerial and boat-based surveys, with a special emphasis on Marbled Murrelets Brachyramphus marmoratus. We surveyed 44 eight-kilometer transects in nearshore waters of Monterey Bay, California, from December 2005 through March 2006. We found that density estimates of all birds combined and of Western Aechmopho...

Journal: :Int. J. Comp. Sci. Sport 2015
Franz Gravenhorst Amir Muaremi Conny Draper Margy Galloway Gerhard Tröster

Finding the best fit of rowers for a crew boat is a challenging task. Each rower has a unique technique and the ability to adapt this to a crew varies from person to person. Currently, subjective evaluations and qualitative measures are the main methods used to try to put the fastest crew together. To make the process more accurate and objective we introduce 177 performance metrics to quantify ...

Journal: :Biology letters 2010
Alvin Aaden Yim-Hol Chan Paulina Giraldo-Perez Sonja Smith Daniel T Blumstein

Many studies have focused on the effects of anthropogenic noise on animal communication, but only a few have looked at its effect on other behavioural systems. We designed a playback experiment to test the effect of noise on predation risk assessment. We found that in response to boat motor playback, Caribbean hermit crabs (Coenobita clypeatus) allowed a simulated predator to approach closer be...

2013
Lori A. Lester Harold W. Avery Andrew S. Harrison Edward A. Standora

Recreational boats are a dominant feature of estuarine waters in the United States. Boat strike injury and mortality may have a detrimental effect on populations of diamondback terrapins (Malaclemys terrapin), a keystone species in estuarine ecosystems. In Barnegat Bay, New Jersey, 11% of terrapins (n = 2,644) have scars consistent with injuries from boats. Conservative estimates of injury rate...

2008
Nicholas Caplan Trevor Gardner

Caplan and Gardner (2007: Journal of Sports Sciences, 25, 1025-1034) presented a rowing simulation which assumed that each rower moved as a single mass. Although validated against mean onwater shell velocity, instantaneous velocity was not modeled well. As any changes to rowing technique inherently influence the fluctuations in boat velocity throughout each stroke, the previous model was unable...

2013
Helen Sian Armstrong

Rowing is an intensive, all-body sport, where bad technique can lead to injury. Crew cohesion, particularly timing, is vital to the performance of the boat. The coaching process, and injury prevention, could be enhanced if data relating to the movement of the oarsmen could be collected, without hindrance to the oarsmen, during on-water training. Literature until recently has concentrated upon b...

Journal: :Organic & biomolecular chemistry 2009
Jun Cheng Tsutomu Hoshino

The enzymatic cyclization reaction of polyprenoid C(33) by squalene-hopene cyclase (SHC) was investigated with the intention of creating an unnatural hexacyclic compound. The enzymatic products consisted of mono-, bi-, tri-, tetra- and pentacyclic skeletons; however, hexacyclic products were not generated, contrary to our expectations. The absence of a hexacyclic skeleton indicated that the ent...

2016
Ahmed Benzalim Aziz Auhmani Abdoullah Bimoussa My Youssef Ait Itto Jean-Claude Daran Abdelwahed Auhmani

The title compound, C16H24Cl2O, was synthesized by treating (1S,3R,8S,9R,10S)-2,2-di-chloro-3,7,7,10-tetra-methyl-9,10-ep-oxy-tri-cyclo-[6.4.0.0(1,3)]dodecane with a concentrated solution of hydro-bromic acid. It is built up from three fused rings: a cyclo-heptane ring, a cyclo-hexyl ring bearing alkene and hy-droxy substituents, and a cyclo-propane ring bearing two chlorine atoms. The asymmetr...

Journal: :Operations Research 2012
Michael R. Wagner Zinovy Radovilsky

The United States Coast Guard (USCG), a part of the U.S. Department of Homeland Security, is the nation’s leading agency in maritime security, safety, and stewardship. One of the primary USCG resources is a fleet of boats (maritime vessels less than 65 feet in length) of various types that must be allocated to USCG stations nationwide. This paper describes the academic-industry collaboration be...

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