123,661 research outputs found
Oral History Interview with James Atkinson, March 23, 2006
No full textThe National Museum of the Pacific War presents an oral interview with James E. Atkinson. Atkinson was born in Pine Bluff, Arkansas in 1921. His younger brother was killed in Europe during the war. Atkinson attended Vanderbilt University with a football scholarship in 1940. In 1942 he joined the Navy Reserves and entered the V-12 Navy College Training Program. Soon afterwards, he entered Midshipman’s school at Notre Dame. Upon graduating 20 June 1944, he was commissioned an ensign. He then entered submarine school at New London, Connecticut. He describes the characteristics of a fleet submarine. After completing four months of school, he flew to Brisbane, Australia and reported aboard the USS Flasher (SS-249). Atkinson served during the boat’s fourth, fifth and sixth combat patrols. He describes sinking two Japanese destroyers and four tankers. On the sixth combat patrol, they sank two Japanese ships and returned to Pearl Harbor for overhaul in April 1945. Afterwards, the boat was at sea bound for Guam when the atomic bombs were dropped on Japan. Returning to New London, Connecticut, the crew decommissioned the boat
Data for: Venture Capital Restrained After Sarbanes-Oxley
No full textUnderlying data and replication files for Venture Capital Restrained After Sarbanes-Oxley, by Tyler Atkinson and John V. Duca---------------------------------------------------------Data and estimation results for Table 1 can be found in the Eviews work file VentureCapital_and_SOX.wf1Estimation results for Table 2 can be found by running the Stata do filegregory_hansen_test.do. This requires an ssc install of ghansenEstimation results for Table 3 can be found by running the matlab file Kjriwal_Perron_test.m. The additional files necessary to run this code can be found at Pierre Perron's code page: http://people.bu.edu/perron/code.htm
Premnobius perezdelacrucei Petrov & Atkinson
No full textPremnobius perezdelacrucei Petrov & Atkinson Fig. 4 C, D Premnobius perezdelacrucei Petrov & Atkinson, 2018: 42. Gnathotrupes megapunctatus Bright, 2019: 410. New synonymy. Similar species. Among the American species this most closely resembles P. assiduus. Diagnosis. Length 2.45 mm, 4 as long as wide (Petrov & Atkinson 2018: 42). Very slender, with proportionately elongate pronotum. Frons shining, weakly reticulate, with sparse setae. Pronotum elongate, 80% as long as elytra; anterior margin rounded, weakly elevated with small asperities; summit located about 25% of length from anterior margin. Disc smooth, shining, with shallow, sparse punctures; vestiture a mixture of taller and shorter erect setae. Elytral striae not impressed, interstriae 2 width of striae; vestiture of erect setae, length greater than width of interstriae, mostly uniseriate, about twice as long at base of declivity. Declivity occupying posterior 33% of elytral length. A raised posterolateral crest present from interstria 4 to apex, transition gradual above. Declivity with a small, sharp tooth near base on interstria 3, displaced mesally from declivital margin; a laterally flattened, apically rounded projection on crest about 2/3 of the distance to apex, its basal length greater than its height. New Records. Brazil: Bahia, Una, Fazenda Vera Cruz, 1518′24″ S 3909′30″W, 24-II-2013, ethanol-baited, cocoa cabruca agroforestry system, S. Novais (MEFEIS, 1); Minas Gerais, Capinópolis, Fazenda Grama, 1846′7.32″S 4928′38.65″W, 16-III-2020, 30-III-2020, ethanol-baited FIT, Khaya grandifoliola stand planted IX-2015, C.F. Faria (MEFEIS, 2); same general locality, 1846′6.18″S 4928′51.59″W, 10-III-2020, ethanol-baited, Khaya grandifoliola stand planted IX-2014, C.F. Faria (MEFEIS, 1); French Guiana: Paracou (Res. Station?), XI-1996, canopy window trap, P.G. Hammond (NHMUK, 1). Distribution. Widely distributed from southeastern Mexico and the Dominican Republic to southern Brazil (Fig. 12C).Published as part of Atkinson, Thomas H., Flechtmann, Carlos A. H. & Petrov, Alexander V., 2023, Synopsis of the Neotropical Premnobiina (Coleoptera: Curculonidae: Scolytinae Ipini) with descriptions of new species, new synonymy and keys to species, pp. 69-91 in Zootaxa 5249 (1) on page 77, DOI: 10.11646/zootaxa.5249.1.4, http://zenodo.org/record/768531
Oral History Interview with James Atkinson, March 23, 2006
No full textThe National Museum of the Pacific War presents an oral interview with James E. Atkinson. Atkinson was born in Pine Bluff, Arkansas in 1921. His younger brother was killed in Europe during the war. Atkinson attended Vanderbilt University with a football scholarship in 1940. In 1942 he joined the Navy Reserves and entered the V-12 Navy College Training Program. Soon afterwards, he entered Midshipman’s school at Notre Dame. Upon graduating 20 June 1944, he was commissioned an ensign. He then entered submarine school at New London, Connecticut. He describes the characteristics of a fleet submarine. After completing four months of school, he flew to Brisbane, Australia and reported aboard the USS Flasher (SS-249). Atkinson served during the boat’s fourth, fifth and sixth combat patrols. He describes sinking two Japanese destroyers and four tankers. On the sixth combat patrol, they sank two Japanese ships and returned to Pearl Harbor for overhaul in April 1945. Afterwards, the boat was at sea bound for Guam when the atomic bombs were dropped on Japan. Returning to New London, Connecticut, the crew decommissioned the boat
Neural mechanisms of attention become more specialised during infancy: Insights from combined eye tracking and EEG
No full textThe Fixation Shift Paradigm (FSP) measures infants' ability to shift gaze from a central fixation stimulus to a peripheral target (e.g. Hood & Atkinson, 1993: Infant Behavior and Development, 16(4), 405-422). Cortical maturation has been suggested as crucial for the developing ability to shift attention. This study investigated the development of neural mechanisms by combining EEG with simultaneous eye tracking during FSP testing, in typically developing infants aged between 1 and 8 months. The most prominent neural response was a frontal positivity which occurred only in the hemisphere contralateral to the target in the youngest infants but became more ipsilateral with age. This changing lateralisation was associated with improving ability to shift attention (decreasing saccade latencies and fewer 'sticky fixations'-failures to disengage attention from the central target). These findings suggest that the lateralisation of neural responses develops during infancy, possibly due to developing intracortical connections, allowing infants to shift attention more efficiently.DAAD; Leverhulme Trus
Premnobius neoadjunctus Atkinson, Petrov & Flechtmann 2018
No full textPremnobius neoadjunctus (Schedl) Fig. 4 A, B Xyleborus neoadjunctus Schedl, 1967: 13 Coptoborus neoadjunctus (Schedl): Wood & Bright 1992: 663. Gnathotrupes neoadjunctus (Schedl): Wood 2007: 670. Premnobius neoadjunctus (Schedl): Atkinson et al. 2018: 3. Similar species. This species most resembles P. flechtmanni in that both have only a single blunt projection on the declivital crest without additional tubercles. Diagnosis. Length 2.8 mm, 3 as long as wide (Wood 2007: 670). Frons granulate-punctate. Anterior margin of pronotum subtruncate, unarmed. Pronotum with summit at anterior third, disc shining with moderately deep punctures, separated by 3–4 their diameters, vestiture of short, fine, erect setae, longer laterally. Striae on disc not impressed; interstriae 3 as wide of striae. Uniseriate interstrial setae fine, about as long as width of interstriae, becoming much longer posteriorly near declivital crest. Declivity occupying posterior third of elytra, concave, with an elevated crest from interstria 4 to apex, transition gradual at base. Declivital crest irregularly granulate, with a quadrate, blunt, laterally compressed process about 2/3 distance from base to apex. Strial punctures distinct, uniseriate on face of declivity, large than on disc. Long setae on crest also present in anterolateral areas of face, before quadrate processes. Note. Atkinson et al. (2018) mistakenly showed the declivity of P. assiduus in Fig. 4D, not the declivity of this species. Distribution. Known only from two localities in Amazonian and southern Brazil (Fig. 12D).Published as part of Atkinson, Thomas H., Flechtmann, Carlos A. H. & Petrov, Alexander V., 2023, Synopsis of the Neotropical Premnobiina (Coleoptera: Curculonidae: Scolytinae Ipini) with descriptions of new species, new synonymy and keys to species, pp. 69-91 in Zootaxa 5249 (1) on page 77, DOI: 10.11646/zootaxa.5249.1.4, http://zenodo.org/record/768531
Premnobius flechtmanni Atkinson, Petrov & Flechtmann 2018
No full textPremnobius flechtmanni (Wood) Fig. 4 E, F Acanthotomicus flechtmanni Wood, 2007: 337. Premnobius flechtmanni (Wood): Atkinson et al. 2018: 3. Similar species. This species closely resembles P. neoadjunctus. At present very few specimens of either species have been collected. Further collection is needed to determine whether these are distinct species. Diagnosis. Length 2.0 mm, 3.0 as long as wide (Wood 2007: 337). Frons reticulate in center, punctate laterally. Anterior margin of pronotum rounded, with 8–10 small teeth along margin. Pronotal summit about 33% of pronotal length. Disc shining, with shallow, widely spaced punctures and very short, erect setae, their length less than distance between punctures. Striae on disc not impressed, interstriae 3 as wide as striae. Interstrial setae uniseriate, their length slightly longer than interstrial width, longer and stouter on odd-numbered interstriae, becoming longer posteriorly. Declivity occupying 33% of elytral length, shallowly concave. Raised, acute declivital crest extending from interstria 4 to apex. A small, acute denticle present on interstria 2 at base of declivity; a larger one on interstria 4, displaced mesally from crest, and a quadrate, blunt, flattened projection near middle of declivity, also displaced mesally from crest. Punctures on declivital face confused, some long setae present on face extending from crest to mid line anterior to quadrate projections. Distribution. All collection localities are from southern interior Brazil, in forests that are drier than those of the coast and Amazon Basin (Fig. 12D). New Records. Brazil: Mato Grosso, Sorriso, Fazenda Anastácia, 1231′5.43″S 5541′24.15″W, 19-V-2021, ethanol-baited FIT, stand reforested with native trees in Dec2016, with predominance of Parapiptadenia rigida, O.T. Dall’Oglio (MEFEIS, 1).Published as part of Atkinson, Thomas H., Flechtmann, Carlos A. H. & Petrov, Alexander V., 2023, Synopsis of the Neotropical Premnobiina (Coleoptera: Curculonidae: Scolytinae Ipini) with descriptions of new species, new synonymy and keys to species, pp. 69-91 in Zootaxa 5249 (1) on pages 76-77, DOI: 10.11646/zootaxa.5249.1.4, http://zenodo.org/record/768531
Wavelength-dependent spatial variation in the reflectance of 'homogeneous' ground calibration targets (Paper presented at XIX ISPRS Congress, 16-22 July, 2000, Amsterdam, The Netherlands)
No full textRemotely sensed data are most useful if calibrated to spectral reflectance of known features. One simple method of calibration is regression of remote data on the reflectance of several ground targets as measured in the field, the so called empirical line method (ELM). The ideal situation would be one where a range of ground targets representing all the features of interest in the remote image were available for ground measurements (Lawless et al., 1998). The identification of suitable ground targets is constrained by several limitations, such as their size (to minimise edge effects), their absolute reflectance (to represent spectral characteristics of the image) and their effective spatial variability (to extract reflectance characteristics representative of the target). The size of a ground target is dependent on the spatial resolution of the image that must be calibrated (Justice &
Townshend, 1981) and the number of observations needed to represent features in the image has been suggested to depend upon the spatial resolution of the remotely sensed image (Justice & Townshend, 1981) and on the spatial variability of the ground target (Harlan et al., 1979; Curran & Williamson, 1986). Although ground targets used for calibration should be spectrally “bland” and spatially uniform by definition (Clark et al., 1999), it is sometimes very difficult to find such places
available for calibrating remotely sensed images. When surfaces that apparently satisfy these conditions are available in suitable size, their sampling needs to be designed to optimise representation of the whole surface and available resources (e.g., effort and time). Surfaces that look spatially uniform by eye may actually contain spatial variation, and this spatial variation may depends on wavelength (Atkinson & Emery, 1999). Such variability can be detected using geostatistics, which is concerned with issues such as spatial correlation and analyses
of spatial data. Geostatistical tools have been used in a variety of studies and the variogram has been applied in remote sensing and ecology to design optimal sampling strategies for variables sampled in space (Atkinson, 1991; Rossi et al., 1992) and time (Salvatori et al., 1999). This study investigates the spatial variability of potentially suitable ground calibration targets (GCT) using a geostatistical approach, which gives results that can be used to design optimal sampling strategies for such surfaces. The targets were selected from an area where an Itres
Instruments Compact Airborne Spectral Imager (casi) with ground resolution of about 1.5 metres was flown at the same time as ground data were acquired
Cactopinus rhettbutleri Atkinson, sp. n.
No full textCactopinus rhettbutleri Atkinson, sp. n. Male: ( Figs. 1–2). Color black, length 1.87 mm (1.8–2.05), width 0.85 mm (0.8–1.0), length/width 2.19 (1.9–2.4) (n=11). Head: Dense fringe of downwards projecting, fimbriate setae along entire width of epistomal margin, covering base of mandibles; similar, smaller brushes at base of mandibles at genal margin. Epistoma raised for its entire width, with a single, small tubercle at each end, rising gradually in middle to base of horns. Horns joined at base, parallel throughout their length along interior margins, broadened distally; anterior surface shining, deeply, coarsely punctured, with yellowish setae arising from punctures; apex of horns digitate, impunctate; punctures on external margins of horns with raised lateral elevations; the most distal of these with a prominent lateral process, giving the horn a forked appearance; a large brush of yellow setae arising from this cleft, length of setae exceeding the apex, similar in size and color to those of epistomal brush. Frons concave in profile, shallowly concave in medial area between eyes, margins of concavity gradual, not acute; frontal surface above horns coarsely punctured, largely without setae; surface shining. Antennal club approximately twice as long as wide; basal half corneous, 2 straight sutures evident on distal half, lined with yellow setae. Pronotum: Asperities concentrated behind middle; summit acute, slightly projected posteriorly beyond base; asperities on anterior slope sparse, separated, tooth-like. Postero-lateral portions of pronotum smooth, shining, with widely spaced, deep punctures; this area with a clear demarcation from densely placed, confused asperities on summit. Acute setae associated with punctures throughout; those in antero-lateral areas and along lateral margins of raised summit twice as long as others, as long as antennal scape. Elytra: Striae deeply punctured but not impressed, punctures separated by less than their diameter. Interstriae twice as wide as striae with clearly marked, uniseriate punctures that are smaller than those of the striae; surface smooth and shining; vestiture of erect golden interstrial setae, their length less than that of the interstrial width. Declivity steep; striae 1 impressed with sutural interstria elevated, interstria 2 slightly widened with a small number of widely spaced granules; interstria 3 elevated, highest in middle, but not higher than the sutural interstria; all declivital interstriae (reduced in 2) with small uniseriate granules associated with interstrial punctures; strial punctures not granulate. Female: (Fig. 3). Length 1.90 mm (1.8–2.05), width 0.86 mm (0.9–0.95), length/width 2.13 (2.1–2.3) (n=11). Frons weakly concave between eyes; surface densely pubescent with setae uniform in length throughout, about 2/3 length of antennal scape, becoming shorter at vertex; brush of marginal setae along epistoma similar to that of male; epistoma without any trace of lateral elevation. Pronotum and elytra similar to that of male. Type material. Holotype: male. Oaxaca, 7 km S Totolapan, road to Santa María Zoquitlán (16.6231 N; 96.3261 W), 982 m, 24-VII-2014, Polaskia sp., T.H. Atkinson & A. Burgos S., THA-1064 (Deposited in the Coleccion Nacional de Insectos (CNIN), Instituto de Biología, Universidad Nacional Autónoma de México). Allotype: female: same data (CNIN). Paratypes: Oaxaca: 7 km S Totolapan, road to Santa María Zoquitlán (16.6231 N; 96.3261 W), 982 m, 24-VII- 2014, Polaskia sp., T.H. Atkinson & A. Burgos S., THA-1064 (UTIC, 6); 2 km N Totolapan (16.68644 N; 96.32061 W), 1,004 m, 1-VII-2009, Escontria chiotilla, T.H. Atkinson, THA-893 (TAMU, 2; UTIC, 3); 5 km S Totolapan, road to Santa María Zoquitlán (16.6515 N; 96.3156 W), 700 m, 24-VII-2014, Polaskia sp., T.H. Atkinson & A. Burgos S., THA-1060 (TAMU, 2); Santiago Dominguillo (17.6337 N; 96.9141 W), 870 m, 2-VII- 2009, Escontria chiotilla, T.H. Atkinson, THA-896 (UTIC, 3); Nejapa (16.6096 N; 96.0134 W), 659 m, 23-VIII- 2014, T.H. Atkinson & A. Burgos S., THA-1058 (CEAM, 5). Puebla: Coxcatlán (18.2446 N; 97.156 W), 1070 m; 19-I-2012, Escontria chiotilla; T.H. Atkinson, THA-979 (CNIN, 2; CEAM, 2; TAMU, 7; UTIC, 6). Notes. As previously discussed (Atkinson, 2010) the male epistomal horns are not segmented. In most species, especially those with the longest horns, there are deep punctures along most of the length of the horn that appear to confer some flexibility by allowing it to bend. In C. rhettbutleri the margins of the subapical punctures are raised into projections. This may be seen in several punctures but is always most prominent in those closest to the apex of the horns. In some males from the Coxcatlán population the epistomal horns are much reduced in size (Fig. 2 B,C,D). In intermediate cases the distal digitate extension is absent or much reduced but the margins of the subapical punctures are still expanded laterally and the more distal punctures on the lateral margins still have a lateral process arising from them and show the bifid, or forked apex. In other species of Cactopinus for which large numbers of specimens from multiple collections are available, there appears to be considerable variation in the length of male horns. This needs to be studied and possibly descriptions and keys will have to be modified. Biology. This species has been collected in the dried ribs of its hosts, multiply branched arborescent cacti. As is the case with most other cactus-breeding Cactopinus species, successful breeding occurs in portions of stems that have dried out to a hard, leathery consistency without the black discoloration associated with decay. Under these conditions the dried tissue is dark yellowish brown and tacky to the touch. This situation most commonly occurs in erect, dead stems still attached to the host. Galleries are initiated at the areoles (clumps of spines that are found along the ridges of the ribs). Species of Polaskia are restricted to the states of Oaxaca and Puebla, roughly within the area where this species was collected. Escontria chiotilla has a broader distribution which includes the Balsas depression of the states of Guerrero and Michoacán. The majority of the species of Cactopinus that breed in columnar or arborescent cacti use hosts in the subtribe Stenocereinae (Gibson et al. 1986). Other reported hosts in this subtribe include Stenocereus and Myrtillocactus. The Escontria and Polaskia also belong to this group and are most closely related to Myrtillocactus. Etymology. This species is named in honor of Rhett Butler for his work in conservation and environmental education. Diagnosis. This species is most readily distinguished by the unique, laterally expanded epistomal horns in the male that appear to be apically forked. The wide variation in horn length documented here for C. rhettbutleri means that some specimens can not be reliably identified at this point. The subapical branching that is typical of this species is visible even in males with reduced horns (Fig. 2 B,C) but not in extreme cases (Fig. 2 D). Examination of long series of other species has also shown wide intraspecific variation in male horn length (unpublished) that effectively means that single male specimens of other species may also present problems in identification. At this point females cannot be reliably identified although this could be accomplished with further study. Based on the abundance of characters present in the known species it should be possible to write new keys that will accommodate both females and males with reduced horns. This is beyond the scope of the current paper. Cactopinus rhettbutleri will key out to couplet 11 in the latest generic key (Atkinson, 2010). Modified couplets are shown below. 11(8) Frons curved in lateral profile, but flat longitudinally; pronotal asperities blunt, weakly developed; declivity with relatively few, small granules on interstriae. 1.2–1.4 mm. Puebla......................................... cactophthorus Wood - Frons weakly to prominently concave in central area between eyes; pronotal asperities sharply elevated, chisel shaped declivity with prominent granules on interstriae 2 and higher.......................................................... 12 12(11) Horns reaching or exceeding upper level of frons, apical portions digitate; interstria 1 on declivity not impressed, interstriae 3 not prominently elevated............................................................................... 13 - Horns not reaching upper level of frons, apical portion not digitate, interstria 1 on declivity strongly impressed, interstriae 3 prominently elevated................................................................................. 13a 13(12) Male horns not expanded distally, digitate apical portions of horns divaricate; 1.5–1.6 mm. In Neobuxbaumia. Morelos, Puebla.......................................................................................... burjosi Wood - Male horns expanded distally, prominent lateral process below digitate apex giving forked appearance. In Escontria, Polaskia. Oaxaca, Puebla....................................................................... rhettbutleri Atkinson 13(13a)Frons with prominent concavity in middle of frons; outer sides of horns parallel, inner sides angled making obvious “V” shape; antennal sutures straight. 1.6–1.9 mm. In Stenocereus. Oaxaca, Querétaro................................ niger Wood - Frons shallowly concave, concavity not well defined; inner sides of horns not strongly angled; antennal sutures bisinuate. 1.4– 1.7 mm. In Stenocereus spp. Jalisco............................................................. setosus WoodPublished as part of Atkinson, Thomas H., 2016, A new species of Cactopinus Schwarz from central Mexico (Coleoptera: Curculionidae: Scolytinae), pp. 196-200 in Zootaxa 4189 (1) on pages 196-200, DOI: 10.11646/zootaxa.4189.1.13, http://zenodo.org/record/16573
Premnobius brownei Atkinson & Flechtmann 2023, new species
No full textPremnobius brownei Atkinson & Flechtmann, new species Fig. 3 A–D urn:lsid:zoobank.org:act: 5C796C45-7F67-4165-83BD-7EFAE7572484 Diagnosis: Among the American species P. brownei is unique in that the large process on the declivital crest is elongate and digitate, rather than quadrate.. Female. Total length: 1.13 mm, maximum width: 0.35, length of elytra: 0.65 mm, total length / width: 3.23, elytra length / width: 1.86, pronotal length / width: 1.37 (n=1). Color dark reddish brown, darker on posterior half and declivity. Frons smooth, shining, surface shallowly punctured, punctures separated by 3 their diameters, a weak longitudinal carina evident from above the upper level of the eyes to the epistoma. First segment of the anterior face of the antennal club corneous, strongly procurved, extending to middle of club; remainder of anterior face pubescent with two procurved sutures visible. Corneous first segment of club displaced distally on posterior face, extending above middle; distal pubescent area with two sutures visible distally and laterally. Pronotum bluntly rounded anteriorly, with ten slightly raised, uniform asperities along margin. Summit anterior to middle, asperities slightly wider than thick, decreasing in size posteriorly. Disc smooth, shining with sparse, short setae, separated by greater than their length. Elytral disc shining, smooth. Striae not impressed on elytral disc, punctures uniseriate with short, recumbent setae. Interstriae 3 as wide as striae, with slightly confused, erect setae, similar in size to those on pronotal disc, shorter than width of interstriae. Declivity gradual, concave, occupying 35% of elytral length in lateral view. Posterolateral margin raised from apex, nearly to base, widest in middle, narrowed behind. Interstria 1 above base with a row of small uniseriate denticles; most other interstriae with some granules near base of declivity. Interstria 2 with small acute denticles at base of declivity. A larger, digitate tubercle is located on the elevated margin about 1/3 of the distance to the apex. The largest digitate projection on the lateral margin is near the apex and twice as long as the middle projection. Confused strial punctures and setae are visible on the declivital face. Male. Unknown. Type Material. Holotype, female, Brazil: Bahia: Vitória da Conquista, UESB campus, 1452′48″ S, 4047′37″ W, 891 m, 7–VI–2019, ethanol-baited, L.C. Oliveira, disturbed seasonal montane forest fragment (MEFEIS). Distribution. Known only from the type locality in eastern Brazil (Fig. 12D). Etymology. This species is named in honor of F.G. Browne for his work on the Premnobiina.Published as part of Atkinson, Thomas H., Flechtmann, Carlos A. H. & Petrov, Alexander V., 2023, Synopsis of the Neotropical Premnobiina (Coleoptera: Curculonidae: Scolytinae Ipini) with descriptions of new species, new synonymy and keys to species, pp. 69-91 in Zootaxa 5249 (1) on pages 74-76, DOI: 10.11646/zootaxa.5249.1.4, http://zenodo.org/record/768531
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