The Effects of Buy-Back Programs in the British Columbia Salmon Fishery

Policymakers have implemented five distinct buybacks of either vessels or salmon licenses over the past three decades in the British Columbia (BC) salmon fishery. The earliest buyback was one of the first of its kind in any fishery and the most recent buyback is one of the largest ever in terms of reducing vessel numbers and the funds used. This paper reviews the circumstances under which these buybacks were conducted with an emphasis on their impact on reducing fishing capacity and effort. The focus is on the two most recent buybacks that took place in 1996 and 1998-2000, what has been learned and what they have achieved.

The effects of buy-back programs in the British Columbia Salmon Fishery

Prepared for the International Workshop on Fishing Vessel and License Buy-Back ProgramsPolicymakers have implemented five distinct buybacks of either vessels or salmon licenses over the past three decades in the British Columbia (BC) salmon fishery. The earliest buyback was one of the first of its kind in any fishery and the most recent buyback is one of the largest ever in terms of reducing vessel numbers and the funds used. This paper reviews the circumstances under which these buybacks were conducted with an emphasis on their impact on reducing fishing capacity and effort. The focus is on the two most recent buybacks that took place in 1996 and 1998-2000, what has been learned and what they have achieved

Direct Experimental Evidence of Metal-Mediated Etching of Suspended Graphene

Atomic resolution high angle annular dark field imaging of suspended, single-layer graphene, onto which the metals Cr, Ti, Pd, Ni, Al and Au atoms had been deposited was carried out in an aberration corrected scanning transmission electron microscope. In combination with electron energy loss spectroscopy, employed to identify individual impurity atoms, it was shown that nano-scale holes were etched into graphene, initiated at sites where single atoms of all the metal species except for gold come into close contact with the graphene. The e-beam scanning process is instrumental in promoting metal atoms from clusters formed during the original metal deposition process onto the clean graphene surface, where they initiate the hole-forming process. Our observations are discussed in the light of calculations in the literature, predicting a much lowered vacancy formation in graphene when metal ad-atoms are present. The requirement and importance of oxygen atoms in this process, although not predicted by such previous calculations, is also discussed, following our observations of hole formation in pristine graphene in the presence of Si-impurity atoms, supported by new calculations which predict a dramatic decrease of the vacancy formation energy, when SiOx molecules are present.Comment: final version accepted in ACS Nano + supplementary info. 22+6 pages, 4+5 figure

Changes in Power Output in NCAA Football Linemen During Competitive Season

Changes in Power Output in NCAA Football Linemen During Competitive Season. Posey, Q., R. Cole, and J. Priest, Tarleton State University, Stephenville, TX 76402 Introduction Measuring power is a practice currently being developed by researchers. An available tool is the TENDO Weightlifting Analyzer (TWA). Although the TWA is a common research tool, there is little published research. The purpose of this study is to analyze OL and DL power output during in-season football. Methods Experimental Approach Seventeen NCAA division II football players in the Lone Start Conference were monitored during organized in-season weight training workouts. TWA measured and recorded their last set of squat. Bio feedback provided by the TWA was used to analyze each group. Subjects Seventeen NCAA division II football players (Age 21.1 ± 4.6 yrs, Ht. 1.6 ± 0.01m, Wt. 123.1 ± 7.4 kg , BMI 35.3 ± 3.2 kg.m-2), volunteered for the study, and had previously trained at least twice per week for 12 weeks. Subjects were familiarized with the TWA and squat protocol during pre-season. Protocol All subjects were required to lift four times a week. On the third workout of every week subjects back-squatted. All subjects completed a standardized warm-up. Subjects determine their own lifting weight. Researchers monitored squats and emphasized bar speed. The TWA was attached to the outside of the bar and measured average power (AP) and peak power (PP) output. Measurements were uploaded from the TWA into TENDO Sports Machine computer program and exported to Microsoft Excel®. Results Repeated measures ANOVA revealed no change in AP (F(3,45)=0.996, p\u3e.05), change in overall PP (F(3,45)=15.3, p\u3c.001) across 4 measures of the competitive season. No group interaction for AP (F(3,45)=.488, p\u3e.05), but PP by group interaction (F(3,45)=6.07, p=.001). AP 1 (W) AP 2 (W) AP 3 (W) AP 4 (W) PP 1 (W) PP 2 (W) PP 3 (W) PP4 (W) OL 911 ± 136 910 ± 124 850 ± 89 893 ± 19 1507 ± 251 1775 ± 258 1207 ± 141 1690 ±142 DL 947 ± 214 905 ± 184 904 ± 184 880 ± 110 1605 ± 343 1728 ± 487 1637 ± 317 1801 ± 215 Table 1. Average (AP) and Peak Power (PP) of Offensive (OL) and Defensive Linesmen (DL) During Competitive Season. Discussion The competitive football season produced normal bumps, bruises, and sprains which impacted the results obtained from bi-weekly measures of AP and PP. The observed changes in PP were attributed to the changes in peak bar velocities for this instantaneous measure, whereas the stability of AP was explained by the less volatile factor of average bar velocities. Conclusion Organized in-season weight training activities are effective at maintaining power output of offensive and defensive linemen

How to resolve the class II common property problem? The case of British Columbia’s multi-species groundfish trawl fishery

It is 20 years since Munro and Scott identified the causes and possible remedies for the dissipation of rents in fisheries. We analyse one of the solutions proposed by Munro and Scott by using insights from the British Columbia multi-species groundfish trawl fishery that has used ITQs since 1997. The history of this fishery shows that even the most difficult management problems including by-catch, equity concerns, concentration of quota holdings and vessel overages can be mitigated with the appropriate mix of incentives, monitoring and enforcement

Flux calibration of the AAO/UKST SuperCOSMOS H-alpha Survey

The AAO/UKST SuperCOSMOS H$\alpha$ Survey (SHS) was, when completed in 2003, a powerful addition to extant wide-field surveys. The combination of areal coverage, spatial resolution and sensitivity in a narrow imaging band, still marks it out today as an excellent resource for the astronomical community. The 233 separate fields are available online in digital form, with each field covering 25 square degrees. The SHS has been the motivation for equivalent surveys in the north, and new digital H$\alpha$ surveys now beginning in the south such as VPHAS+. It has been the foundation of many important discovery projects with the Macquarie/AAO/Strasbourg H$\alpha$ planetary nebula project being a particularly successful example. However, the full potential of the SHS has been hampered by lack of a clear route to acceptable flux calibration from the base photographic data. We have determined the calibration factors for 170 individual SHS fields, and present a direct pathway to the measurement of integrated H$\alpha$ fluxes and surface brightnesses for resolved nebulae detected in the SHS. We also include a catalogue of integrated H$\alpha$ fluxes for $>$100 planetary and other nebulae measured from the SHS, and use these data to show that fluxes, accurate to $\pm$ 0.10 - 0.14 dex ($\sim$25-35 per cent), can be obtained from these fields. For the remaining 63 fields, a mean calibration factor of 12.0 counts pix$^{-1}$ R$^{-1}$ can be used, allowing the determination of reasonable integrated fluxes accurate to better than $\pm$0.2 dex ($\sim$50 per cent). We outline the procedures involved and the caveats that need to be appreciated in achieving such flux measurements. This paper forms a handy reference source that will significantly increase the scientific utility of the SHS.Comment: 14 pages, 12 figures, 2 tables (plus 7 pp. of supplementary online information). Version to appear in MNRA

Time-delay and Doppler tests of the Lorentz symmetry of gravity

Modifications to the classic time-delay effect and Doppler shift in General Relativity (GR) are studied in the context of the Lorentz-violating Standard-Model Extension (SME). We derive the leading Lorentz-violating corrections to the time-delay and Doppler shift signals, for a light ray passing near a massive body. It is demonstrated that anisotropic coefficients for Lorentz violation control a time-dependent behavior of these signals that is qualitatively different from the conventional case in GR. Estimates of sensitivities to gravity-sector coefficients in the SME are given for current and future experiments, including the recent Cassini solar conjunction experiment.Comment: 13 pages, 4 figures, references added, matches PRD versio