2,280 research outputs found
Experimental Data for Research: Selective fish passage: restoring habitat connectivity without facilitating the spread of a non-native species
No full textThis dataset supports the publication: Kerr, J.R. et al (2020). Selective fish passage: Restoring habitat connectivity without facilitating the spread of a non-native species. Journal of Environmental Management
Passage and PIT data from the experimental trials.</span
'If I should die tonight' poem
No full textHumorous poem copied by Harrison Kerr and written by Benjamin Franklin King ca. 1890. The poem, titled "If I should die tonight," jokes about money owed to the author and the shock he would experience at being repaid upon his death. It was written as a parody of a serious contemporary poem of the same title.
Harrison Henry Kerr (1839-1901), born in North Georgetown, Ohio, served along with his brother, Ezra, as a private in Company D of the 58th Ohio Volunteer Infantry. He was taken prisoner at the Battle of Chickasaw Bayou, Mississippi, on December 29, 1862., and held for three months before being exchanged and returning to his regiment. He was discharged on January 14, 1865. Following the war, he was married to Elizabeth (Rettig) Kerr. The two lived in Cleveland and had one son, Harrison McKinley Kerr. In 1888, he joined the Memorial Post No. 141, Grand Army of the Republic. He is buried in North Georgetown Cemetery
Assessing hydrodynamic space use of brown trout, Salmo trutta, in a complex flow environment: a return to first principles
No full textIt is commonly assumed that stream-dwelling fish should select positions where they can reduce energetic costs relative to benefits gained and enhance fitness. However, the selection of appropriate hydrodynamic metrics that predict space use is the subject of recent debate and a cause of controversy. This is for three reasons: 1) flow characteristics are often oversimplified, 2) confounding variables are not always controlled, and 3) there is limited understanding of the explanatory mechanisms that underpin the biophysical interactions between fish and their hydrodynamic environment. This study investigated the space use of brown trout, Salmo trutta, in a complex hydrodynamic flow field created using an array of different sized vertically oriented cylinders in a large open-channel flume in which confounding variables were controlled. A hydrodynamic drag function based on single-point time-averaged velocity statistics that incorporates the influence of turbulent fluctuations (D) was used to infer the energetic cost of steady swimming. Novel hydrodynamic preference curves were developed and used to assess the appropriateness of D as a descriptor of space use compared to other commonly used metrics. Zones in which performance enhancing swimming behaviours (e.g. Kármán gaiting, entraining, and bow riding) that enable fish to hold position while reducing energetic costs (termed ‘specialised behaviours’) were identified and occupancy recorded. We demonstrate that energy conservation strategies play a key role in space use in an energetically taxing environment with the majority of trout groups choosing to frequently occupy areas where specialised behaviours may be adopted or by selecting low drag regions
Modelling fine scale route choice of upstream migrating fish as they approach an instream structure
Get PDFThis study used pattern-oriented modelling (POM) to investigate the space use and behavioural response of upstream migrating European river lamprey (Lampetra fluviatilis) to the two-dimensional hydrodynamic conditions created by an instream structure (triangular profile gauging weir). Passive Integrated Transponder (PIT) and acoustic telemetry were used to map the spatial-temporal distribution patterns of lamprey as they migrated upstream. Acoustic Doppler velocimetry and computer modelling were used to quantify the hydrodynamic environment. In adherence with the POM methodology, multiple movement models, incorporating increasingly complex environmental feedback mechanisms and behavioural rules were created and systematically assessed to identify which factors might reproduce the observed patterns. The best model was a spatially explicit Eulerian-Lagrangian Individual Based Model (IBM) that included two simple behaviours: 1) tortuous non-directed swimming when in low flow velocity (< 0.1 m s−1) and 2) persistent directed (against the flow) swimming in moderate to high flow velocity (≥ 0.1 m s−1). The POM indicated that flow heterogeneity was an important influence of lamprey space use and that simple behavioural rules (i.e. two separate movement behaviours in response to flow velocity) were sufficient to reproduce the main movement pattern observed: avoidance of flow recirculating regions near the banks. The combination of field telemetry, hydrodynamic modelling and POM provided a useful framework for systematically identifying the key factors (hydrodynamic and behavioural) that governed the space use of the target species and would likely work well for investigating similar relationships in other aquatic species
Dataset supporting the publication "Boyle's Law ignores dynamic processes in governing barotrauma in fish"
No full textThis dataset supports the publication by Kerr, J.R., White, P.R., Leighton, T.G., Silva, L.G.M., and Kemp, P.S. "Boyle's Law ignores dynamic processes in governing barotrauma in fish" in JOURNAL: Scientific Reports
The repository includes the three hydropower and one pumping station pressure profiles used in the study: Boyle's Law ignores dynamic processes in governing barotrauma in fish.
The data includes 4 csv files:
Cougar Dam
Ice Harbour Dam
Nam Ngum Dam
Pumping station
This research was funded by 1) an Institutional Links 2017 grant, ID 332396528, under the Newton-Brazil Fund partnership (British Council) (Brazilian funding: FAPEMIG, project ID: CHE-APQ-04822-17, call: CONFAP-British Council) and 2) the Engineering and Physical Sciences Research Council (Reference: EP/N005961/1) through the IDEAS Factory Sandpits programme. </span
Experimental validation of nonlinear Fourier transform-based Kerr-nonlinearity identification over a 1600km SSMF link
No full textRecently, a nonlinear Fourier transform-based Kerr-nonlinearity identification algorithm was demonstrated for a 1000 km NZDSF link with accuracy of 75%. Here, we demonstrate an accuracy of 99% over 1600 km SSMF. Reasons for improved accuracy are discussed.Accepted Author ManuscriptTeam Sander Wahl
International Harmonization and the Gains from Trade
Get PDFInternational harmonization of standards and regulations is often a goal expressed in trade agreements because it is expected to yield gains from trade. Absence of progress toward harmonization is often interpreted as being motivated by protectionism, with differences in standards and regulations seen as non-tariff barriers. While protectionism may well be the source of resistance to harmonization, there may be other reasons it is not pursued. These alternative explanations have not received much attention from economists. In this article some of these alternatives are outlined - demand effects from altering standards, switching costs, proprietary technologies. The article concludes that proposals for international harmonization need to be scrutinized carefully.demand effects, harmonization, regulation, standards, switching costs, TBT, International Relations/Trade,
Magnetised Kerr/CFT correspondence
No full textAbstractThe tools of Kerr/CFT correspondence are applied to the Kerr black hole embedded in an axial external magnetic field. Its extremal near horizon geometry remains a warped and twisted product of AdS2×S2. The central charge of the Virasoro algebra, generating the asymptotic symmetries of the near horizon geometry, is found. It is used to reproduce, via the Cardy formula, the Bekenstein–Hawking entropy of the magnetised Kerr black hole as the statistical microscopic entropy of a dual CFT. The presence of the background magnetic field makes available also a second dual CFT picture, based on the U(1) electromagnetic symmetry, instead of the only rotational one of the standard non-magnetised Kerr spacetime.A Meissner-like effect, where at extremality the external magnetic field is expelled out of the black hole, allows us to infer the value of the mass for these magnetised extremal black holes.The generalisation to the CFT dual for the magnetised extreme Kerr–Newman black hole is also presented
Does the spirit of Charles Dickens live on in his furniture?
No full textA table owned by the author has been export stopped in the UK – a situation that Dickens himself would have relishe
Phthinia neptunei Fitzgerald & Kerr, n. sp.
No full textPhthinia neptunei Fitzgerald & Kerr n. sp. Figs. 30 –38 Type material. Holotype: ♂ (Fig. 30), complete specimen, point-mounted [specimen # 12 K 570; CSCA], USA: CA: Tulare Co.: Whitaker Forest, E. Eshom Crk. Drainage, nr. tree# 142, 36.7062 ºN, - 118.9319 ºW, 1650 masl, YPT, 3.vi– 16.vii. 2010 P. H. Kerr, CSCA 10 L 258. Paratypes: ♂ [SEMC], AK: No. 23, 22 mi. N. Seward, Kenai Peninsula, 1 July 1957, G.W. Byers; ♂ [CNCI], USA: AK: Seward, 26 VI– 18 VII 84, S. & J. Peck, Populus –Picea; ♂ [07Z 135; CSCA], USA: CA: Amador Co.: Indian Grinding Rock St. Pk., dry wash nr. S. Nature trail, MT#2, 38º 25 ’ N, 120 º 38 ’ W’, 715 masl, 10–29.vi. 2007 P. Kerr & M. Hauser, 07LOT 315; 4 ♂♂, ♀ [12 K 573 – 12 K575, 12K581, 12K 583; CSCA], USA: CA: Humboldt Co., Prairie Creek SP, Cal Barrel Rd., appx. 41.3830 ºN, 123.9985 ºW, 275 masl, 2.vi– 25.vii. 2009 P. Kerr & O. Lonsdale, 6m MT, CSCA 09L 521; ♂ [09E043; CASC], ♀ [12 K 569; CSCA], USA: CA: Humboldt Co., Patrick’s Point SP, redwood grove behind visitor center, 41 º08.11’N 124 º09.28’W, ~ 10 masl, 10.iv– 18.viii. 2008, P.Kerr, P.A. Nelson, CSCA 09L 117; ♂ [12 K 572; CSCA], USA: CA: Humboldt Co., Humboldt Bay NWR, Lanphere Dunes, MT# 3 (6m), ~ 6 masl, 40 º 53.421 ’N 124 º08.601’W, 10.iv– 18.viii. 2008 P. H. Kerr, P. Haggard, CSCA 09L 107; ♂ [12 K 712; CSCA], USA: CA: Humboldt Co., Humboldt Bay NWR, Lanphere Dunes, MT# 1 (6m), ~ 6 masl, 40 º 53.488 ’N 124 º08.580’W, 28.ix– 2.xi. 2007 P. H. Kerr, P. Haggard, 07LOT 636; ♂ [12 K 571; CSCA], USA: CA: Tulare Co., same as holotype; ♂, in alcohol [12 J 529; CSCA], USA: CA: Marin: Pt. Reyes NS, Mt Vision Rd, 1.8mi E SF Drake Blvd, 6m MT, 38.1013 ºN, - 122.8878 ºW, 280 masl, P. H. Kerr & C. J. Borkent, 13.iii– 1.v. 2012, CSCA 12 L023; ♂ [14 P027; CSCA] USA: CA: Sonoma Co., Annadel SP, 0.9mi from park lot, ravine near Warren Richardson trail, 38 º 26.11 ’N 122 º 36.67 ’W, 220 masl, 6m MT, 16.iii– 5.v. 2010 P. Kerr, CSCA 10 L011; ♂ [SFC], Benton Co., OR, Mary’s Peak, Hwy 30 @ Hwy 34, picnic area, 27 Sept. 2009, S. & G. Fitzgerald; ♂ [SFC], Benton Co., OR, Sulphur Springs, 6 Oct. 2009, S. &. G. Fitzgerald; ♂, ♀ [SFC], Multnomah Co., OR, 7 Sept. 2012, creek off E. Historic Columbia R. Hwy 1 mi. E. jct. 84 (exit 28), S.J. Fitzgerald; ♂ [SFC], Benton Co., OR, 3 Oct. 2012, Alsea Falls area, Fall Creek jct. trail 6, S. Fitzgerald; ♂ [000015910; OSAC], Seattle, O.B.J.; ♀ [SFC], USA: OR: Benton Co., McDonald –Dunn Forest, Oak Creek bank, sweeping, 44.6041 ºN, - 123.3335 ºW, 1 Oct. 2012, S. Fitzgerald; ♂ [SFC], USA: OR: Benton Co., Corvallis, Lewisburg Saddle, Old Growth trail, sweeping woods and creek, 44.6423 ºN, - 123.2891 ºW, 23 April 2013, S. Fitzgerald; ♂ [SFC], USA: OR: Lane Co., Alderwood State Park off Hwy 36, sweep woods, 44.1541 ºN, - 123.4242 ºW, 18 May 2013, S. Fitzgerald; ♂ [SFC], USA: OR: Benton Co., Mary’s Peak, upper Parker Creek nr. campground, 44.5087 ºN, - 123.5583 ºW, 1 June 2013, S. Fitzgerald; ♂ [ISUI], USA: OR: Clackamas Co., Mt. Hood Nat. For., Sandy R./Ramona Falls trailhead, ~ 45.3844 ºN, - 121.8332 ºW, 15 June 2013, S. Fitzgerald; ♂ [USNM], USA: OR: Benton Co., Corvallis, 1460 SW Allen St., 44.5509 ºN, - 123.2700ºW, 3 March 2013, S. Fitzgerald; ♂ [OSAC #0000770507], same as previous record except 9 April 2013; ♂ [SFC], same as previous record except 6 April 2013, barn window; ♂ [OSAC #0000770506], same as previous record except 29 March 2013, barn window; ♂ [SFC], same as previous record except 1 April 2013, barn window; ♂ [USNM], same as previous record except 31 March, 2013, barn window; ♂ [ISUI], same as previous record except 25 March 2013, barn window; ♂ [SFC], USA: OR: Klamath Co., Deschutes Nat. For., woods N. of Meek Lake, 29–31 Aug. 2013, 43.4652, - 122.0860, sweeping, S. Fitzgerald; ♂ [SFC], USA: WA: Lewis Co., Tatoosh Range, FR 5270 ~mi. 5.6, woods and mossy rocks along Butler Creek, ~ 46.6927 ºN, - 121.7070 ºW, 17 June 2013, S. Fitzgerald; ♂ [CNCI], CANADA: BC: Pt. Grey, Vancouver, 15.8. 1972, J.R. Vockeroth; ♂ [CNCI], CANADA: BC: Pt. Grey, Vancouver, 8 VIII 1972, J.R. Vockeroth; ♂ [CNCI], CANADA: BC: Capilano 300m, N. Vancouver, 17 X 1972, J.R. Vockeroth. Additional material examined: ♂ [UCDC], Sagehen Crk, Nevada Co. CA, VII– 16–80 / R M Bohart Colr; ♂ [SFC], USA: OR: Clackamas Co., Mt. Hood Nat. For., S. side Sandy R. nr. jct. trails 770 & 2000, woods/hillside seeps, ~ 45.3897 ºN, - 121.8141 ºW, 14 June 2013, S. Fitzgerald; ♂ [CASC], CANADA: BC: Upper Carmanah Valley, UTM: 10 U CJ 803006, 12 VIII- 27 VIII 1991, N. Winchester, TZ.MT 3; ♂ [CASC], CANADA: BC: Upper Carmanah Valley, UTM: 10 U CJ 803006, 28 VIII- 9 IX 1991, N. Winchester, TZ.MT 1. FIGURE 31. P. neptunei n. sp., head and thorax [holotype male, # 12 K 570]. Scale bar = 0.1 mm • Etymology. This species is named after the Roman god of the sea, Neptune, as it is found patrolling the western edge of the Pacific states, from California to Washington, bearing a trident-shaped gonostylus. Diagnosis and comments. Phthinia neptunei n. sp. is most similar to P. hyrcanica Zaitzev (described from Azerbaijan), but is easily distinguished by the trifurcate versus bifurcate gonostylus, respectively. In the Nearctic region P. neptunei n. sp. is most similar to P. ramificans, but can be distinguished by the structure of the male terminalia. Both species have the gonostylus trilobate. However, in P. neptunei n. sp. the gonostylus is more compact, with three straight, apically acute, saber-like lobes projecting in roughly the same plane, which gives the impression of a trident or the thumb and two fingers of a hand with the palm facing up (Fig. 36). In contrast, the three lobes in P. ramif icans are quite different from each other; an elongate slightly outwardly-curving saber-like lobe apically, a shorter spatulate lobe basally, and a smaller, rather insignificant lobe, between the two (Figs. 39 –40, 42– 43; see also Zaitzev 1993: 36, Figs. 1–2). Additionally, P. neptunei has the apex of the gonocoxites adorned with numerous, inwardly-directed, strong, spine-like, setae (Fig. 37) whereas P. ramificans lacks such setae, and has the gonocoxites apically tapered and elongated into a spine-like lobe (Figs. 43, 40). In California and Oregon, where only P. neptunei and P. cascadica have been recorded, females of these two species can be distinguished by the different distribution of macrotrichia on the wing, the relative divergence of A 1 from the petiole of the cubital fork, and the presence/absence of posterior setae on the hind tibia (see couplet 1 in key). Description. Male. Body length: 5.4–6.6, 6.1 [6.6] mm (n= 10). Head. First flagellomere longer, about 1.5 times the length of flagellomere 2. Thorax. Laterotergite bare. Scutellum with 4 stronger bristles (although sometimes only 2–3 apparent and sometimes all setae are shorn off). Legs. First tarsomere of foreleg about 2.3 x length of foretibia, first tarsomere of midleg about 1.2 x as long as midtibia, and first tarsomere of hind leg about 0.7 x as long as hind tibia. Hind tibia with 7–10 minute anterior setae and 13–20 minute dorsal setae, and posterior setae absent (n= 4); midtibia also with a small number of minute anterior and dorsal setae. Wings (Fig. 32). Length: 3.7–4.5, 4.2 [4.3] mm (n= 10). Membrane densely covered with macrotrichia and microtrichia. C extending about 2 / 5 of the distance between R 5 and M 1; Rs about 1 / 5 length r-m; petiole of medial fork 2 / 5 – 2 / 3 length of r-m; medial fork complete though basal 2 / 3 of M 1 may be faint; A 1 running quite divergent from stem of CuA (Fig. 32). Abdomen. Terminalia (Figs. 33–37). Terminalia brown, not contrasting color of abdomen. Tergite 9 well developed (Fig. 35), basally narrowly fused with gonocoxites laterally. Cerci slender elongate, apically acute and each with a very strong seta apically (Fig. 35). Hypoproct small, posterior margin medially emarginate, forming a pair of small rounded, setose lobes ventral to cerci (Fig. 35). Gonocoxite developed beyond point of articulation of gonostylus into an apical (posteriorly directed) lobe bearing very strong, spine-like setae on inner (mesal) surface (Figs. 34, 36– 37). Gonostylus (Fig. 36) apically trifurcate; all lobes blade-like, apically acute, with longest blade anteriorly and shortest posteriorly; blade-like lobes dark-brown to black contrasting with lighter brown base of gonostylus. Paramere (Fig. 36) strongly sclerotized with four short, digitate, apically-rounded lobes. Aedegal complex small, apically tapered. Female. Body length: 6.0 mm (n= 1). Similar to male; terminalia as Fig. 38. FIGURS 38. P. neptunei n. sp., wing [paratype female, # 12 K 891]. Scale bar = 0.1 mm. Discussion. A single male specimen in ANSP from Mt. Rainier, Washington labeled as the type of “ Phthinia nanicra Fisher ” was examined and found to be conspecific with P. neptunei n. sp. The male terminalia of this specimen had deteriorated into just fragments found embedded within a black tar-like mass (we were only able to identify a gonostylus and parameres from the fragments). The name “ nanicra ” is apparently a manuscript name used by Fisher though no associated manuscript of Fisher’s was found in the archives of ANSP or USNM. Bionomics. Phthinia neptunei n. sp. is known from western California, Oregon, Washington, British Columbia, and Alaska at elevations from 6m – 1706m. It has been collected from redwood forests in coastal California, from both coniferousconiferousous and mixed woods in Oregon, and from Populus –Picea woods in Alaska. Specimens have been taken on dunes, swept from undercut creek banks, taken in Malaise traps, and found resting on the inside of windows in an old barn. The seasonal distribution is March–November with the greatest number of records June–July.Published as part of Fitzgerald, Scott J. & Kerr, Peter H., 2014, Revision of Nearctic Phthinia Winnertz (Diptera: Mycetophilidae), pp. 301-325 in Zootaxa 3856 (3) on pages 316-320, DOI: 10.11646/zootaxa.3856.3.1, http://zenodo.org/record/25169
- …
