180,081 research outputs found
Ricker, Richard R.
No full textCarte de Visite of Assistant Surgeon Richard R. Ricker, 31st Maine Infantry, also 23rd Maine Infantry; From the MacDonald Collectionhttps://digitalmaine.com/arc_civilwarportraits/2654/thumbnail.jp
Ricker, Richard R.
No full textCarte de Visite of Assistant Surgeon Richard R. Ricker, 31st Maine Infantry, also 23rd Maine Infantry; From the MacDonald Collectionhttps://digitalmaine.com/arc_civilwarportraits/2654/thumbnail.jp
Zealeuctra RICKER 1952
No full textEmended key to Zealeuctra males. The following couplets from the key to Zealeuctra males are from Grubbs et al. (2013). New couplets are proposed to include the new species. 9 Epiproct comprised of two prominent spines, a large posterior spine plus an accessory anterior spine (fig. 10B, Grubbs et al. 2013) ……………………...… Z. warreni Ricker & Ross 9’ Epiproct bearing only a small, subterminal cusp posterior to the main spine (Figs. 10–12 & 20, figs. 1B, 4C, Grubbs et al. 2013) ………… 10 10 Cleft narrowly U-shaped anteriorly and divergent posteriorly with the inner margins sinuate (Figs. 7–9); currently known only from North Carolina …………………..… Z. uwharrie Verdone, Beaty, Holland & Kondratieff 10’ Cleft broadly U-shaped (Fig. 21, figs. 1A, 4 A, Grubbs et al. 2013); known only from Texas or widely distributed …………………………… 11 11 Epiproct base bearing a conspicuous, slightly concave cusp anteriorly (figs. 1B–C, Grubbs et al. 2013); known only from Texas (fig. 12, Grubbs et al. 2013)..… Z. arnoldi Ricker & Ross 11’ Epiproct base simple (Fig. 20) and lacking a prominent cusp, at most, only a very small rounded projection anteriorly (Fig. 20, fig. 4C, Grubbs et al. 2013); sporadically distributed across the central and eastern USA (fig. 11, Grubbs et al. 2013)..… Z. fraxina Ricker & RossPublished as part of Verdone, Chris J., Beaty, Steven R., Holland, Victor B. & Kondratieff, Boris C., 2019, A New Species Of Zealeuctra Ricker, 1952 (Plecoptera: Leuctridae) From North Carolina, U. S. A., pp. 65-78 in Illiesia 15 (3) on page 74, DOI: 10.5281/zenodo.475810
Bolshecapnia Ricker 1965
No full text<i>Bolshecapnia</i> Ricker, 1965 <p>(Figs. 17–18, 29, 33)</p> <p> <i>Capnia (Bolschecapnia)</i> Ricker, 1965 — Ricker 1965: 478. (misspelling in the stating of the name, used as <i>Bolshecapnia</i> elsewhere in the original description).</p> <p> <i>Capnia (Bolshecapnia)</i> Ricker, 1965 — Ricker 1965: 478. (original description, type species <i>Capnia (Bolshecapnia) gregsoni</i> Ricker, 1965).</p> <p> <i>Capnia</i> Pictet, 1841 — Zwick 1973: 370. (synonymy of <i>Capnia (Bolschecapnia)</i> Ricker, 1965 with <i>Capnia</i> Pictet, 1841).</p> <p> <i>Bolshecapnia</i> Ricker, 1965 — Ricker & Scudder 1975: 333. (first use as a generic name, without formal designation and removed from synonymy).</p> <p> <b>Diagnosis.</b> Male epiproct: B-scl large, divided from Ep-scl; Lb-scl small, divided from Ep-scl; Ep-scl laterally divided in the apical part or the whole length with membranous connecting tissue, ventrally divided in the basal and apical or only in the apical section, caudal setae absent; I-scl long, divided hook or tube; Ec present. Male Pp: apical part long and narrow; Fp long and narrow, divided from Rp. Male Sg: divided from St 9 and Tg 9, vesicle present. Female Sg: pointed or rounded, narrower than St 8 but usually overhanging; lateral sclerites present. Male tergites: Tg 9 with process or process lacking. Ventral thoracic sclerites: MPrs and MeFs triangular, MeFsp separated from MePfs. Macropterous wings: forewing A1 beyond a straight or gently curved, R1 before r curved; crossveins between C and Sc one to eight, R veins three to six.</p> <p> <b>Species included.</b> 7 valid species from the West Nearctic (DeWalt <i>et al.</i> 2014); 6 of these examined (see Appendix 1).</p> <p> <b>Remarks.</b> Despite the seemingly obvious differences among the males of the species, males share similar developed epiproct structures. An exception is <i>B. milami</i> (Nebeker & Gaufin, 1967) that has much more divided Ep-scl than other members of the genus. Nevertheless, its epiproct and the entire terminalia share the other features distinctive for the genus. Lacking process on Tg 9 of the type species <i>B. gregsoni</i> (Ricker, 1965) can be regarded as a secondary loss, because of the presence of a setose hump instead of a process.</p>Published as part of <i>Murányi, Dávid, Gamboa, Maribet & Orci, Kirill Márk, 2014, Zwicknia gen. n., a new genus for the Capnia bifrons species group, with descriptions of three new species based on morphology, drumming signals and molecular genetics, and a synopsis of the West Palaearctic and Nearctic genera of Capniidae (Plecoptera), pp. 1-82 in Zootaxa 3812 (1)</i> on page 15, DOI: 10.11646/zootaxa.3812.1.1, <a href="http://zenodo.org/record/4919079">http://zenodo.org/record/4919079</a>
Allocapnia indianae Ricker 1952
No full textAllocapnia indianae Ricker (Figs. 49-54) Allocapnia indianae Ricker 1952:162. Holotype ♀ (Illinois Natural History Survey), creek northwest of Medora, [Jackson Co.], Indiana Allocapnia indianae: Ross & Ricker, 1971:47. Material examined. Kentucky: Carter Co., Grassy Creek, Hwy AA9, 3 March 2001, B.C. Kondratieff, R.F. Kirchner, R. E. Zuellig, 152♂, 19♀ (CSUC). Lewis Co., Kinniconick Creek, SE Vanceburg, 3 March 2001, B.C. Kondratieff, R.F. Kirchner, R. E. Zuellig, 11♂ (CSUC). Lincoln Co., Green River, Hwy 698, Jumbo, 3 March 2001, B.C. Kondratieff, R.F. Kirchner, R.E. Zuellig, 3♂ (CSUC). Male epiproct. Apical segment of upper limb ca. 265- 277 μm long, armed on apical ca. 152-172 μm with dense patch of wave-like spikes (Figs. 49-52); apical segment ca. 100-106 μm wide at base, tapered to a narrow rounded tip. Basal segment of upper limb ca. 257 μm long and ca. 65-67 μm wide at midlength; basal segment with a broad, shallow, median groove. Greatest width of lower limb ca. 176-187 μm; lower limb bears a sparse, marginal row of long setae in apical third (Fig. 49). Male tergal process. Prominent raised structures on abdominal terga 7 and 8 (Figs. 53-54). Trilobed process of tergum 8 ca. 140-146 μm wide and bearing a broad, shallow median notch, interrupted by median projection. Lobes of process covered with scale-like structures; anterior face of process bears a deep transverse groove (Fig. 53). In lateral aspect, lobes extend vertically as thin discs set on narrow bases. Process of tergum 7 ca. 100 μm wide; similar in structure to 8 th tergal process.Published as part of Stark, Bill P. & Kondratieff, Boris C., 2012, Epiproct And Dorsal Process Structure In The Allocapnia Forbesi Frison, A. Pygmaea (Burmeister), And A. Rickeri Frison Species Groups (Plecoptera: Capniidae), And Inclusion Of A. Minima (Newport) In A New Species Group, pp. 45-77 in Illiesia 8 (5) on page 60, DOI: 10.5281/zenodo.476072
Erratum to: Dynamics and spectrum of the Cesàro operator on C_infty(R+)
No full textAlbanese, A.; Bonet Solves, JA.; Ricker, WJ. (2016). Erratum to: Dynamics and spectrum of the Cesàro operator on C_infty(R+). Monatshefte für Mathematik. 181(4):991-993. https://doi.org/10.1007/s00605-016-0975-0S9919931814Domański, P., Langenbruch, M.: Surjectivity of Euler type differential operators on spaces of smooth functions. Poznań (2016, Preprint
Strophopteryx appalachia Ross & Ricker 1975
No full textStrophopteryx appalachia Ross & Ricker, 1975 was originally described from Virginia and has been reported from adjacent states of North Carolina (Kondratieff et al. 1995), Tennessee, and South Carolina (Unzicker & McCaskill 1982 Stark et al. 1986, Stewart & Stark 1988, Kondratieff et al. 1995,). This species of Brachypterainae was collected from a 2 nd order stream in the Piedmont Plateau Physiographic Province, 51.5 km northwest of Atlanta, Georgia and the Chattooga River at the South Carolina border. Material examined. Georgia, Paulding Co., Bluffy Creek, Hulsey Town Rd., N 33.8926, W 84.92486, 8 February 2017, C. Verdone, B. Kondratieff, ♂, 1N (CSUC). Rabun Co., Chattooga River, Hwy 76 Fishing Access, N 34.81404, W 83.30647, 10 February 2017, C. Verdone, B. Kondratieff, ♀ (CSUC).Published as part of Verdone, Chris J., Kondratieff, Boris C., DeWalt, R. Edward & South, Eric J., 2017, Studies On The Stoneflies Of Georgia With The Description Of A New Species Of Soyedina Ricker, New State Records And An Annotated Checklist, pp. 30-49 in Illiesia 13 (3) on page 39, DOI: 10.5281/zenodo.476106
Modeled dynamic and thermodynamic sea ice growth in the Arctic 1980-2019 from NAOSIM
No full textThis data set is related to the paper "Evidence for an Increasing Role of Ocean Heat in Arctic Winter Sea Ice Growth" by Ricker et al. (2021). Please refer to this study for further details.
Ricker, R., Kauker, F., Schweiger, A., Hendricks, S., Zhang, J., & Paul, S. (2021). Evidence for an Increasing Role of Ocean Heat in Arctic Winter Sea Ice Growth, Journal of Climate, 34(13), 5215-5227. Retrieved Nov 24, 2022, from https://journals.ametsoc.org/view/journals/clim/34/13/JCLI-D-20-0848.1.xm
On the quasi-stationary distribution of a stochastic Ricker model
No full textWe model the evolution of a single-species population by a size-dependent branching process Zt in discrete time. Given that Zt = n the expected value of Zt+1 may be written nexp(r - [gamma]n) where r > 0 is a growth parameter and [gamma] > 0 is an (inhibitive) environmental parameter. For small values of [gamma] the short-term evolution of the normed process [gamma]Zt follows the deterministic Ricker model closely. As long as the parameter r remains in a region where the number of periodic points is finite and the only bifurcations are the period-doubling ones (r in the beginning of the bifurcation sequence), the quasi-stationary distribution of [gamma]Zt is shown to converge weakly to the uniform distribution on the unique attracting or weakly attracting periodic orbit. The long-term behavior of [gamma]Zt differs from that of the Ricker model, however: [gamma]Zt has a finite lifetime a.s. The methods used rely on the central limit theorem and Markov's inequality as well as dynamical systems theory.Size-dependent branching process Quasi-stationary distribution Invariant measure Weak convergence Ricker model Stable period Markov's inequality Entropy function
Velocity Profiles in Annular Passages
No full textTitle: Velocity Profiles of Annular Passages, Author: Thomas W. Ricker, Location: ThodeAn experimental study of turbulent velocity profiles of water flowing in a vertical annular passage is reported in this thesis. Presented are profiles for eccentricities ranging from 0% to 80% and Reynolds numbers from 40,000 to 104,000 in an annulus having a 0.286 radius ratio. Velocities were measured along five radii for all but the concentric configuration and the two arbitrarily chosen configurations are represented in the form of cross-sectional maps of the isovels. A method for deriving the powers N1 and N2 as defined by the equations u/um = [(r2-r)/(r2-rm)]^N2 and u/um = [(r-r1)/(rm-r1)]^N1 is suggested, and these powers were found for the two configurations investigated.ThesisMaster of Engineering (ME
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