170,410 research outputs found
Nearly conservative multivalue methods for separable Hamiltonian problems
No full textThis talk investigates the canonical properties of general linear methods for long time integration of Hamiltonian problems. It is known that
the classical symplecticity property is important for the accurate numerical solution of Hamiltonian problems and this is only possible for "canonical"
Runge-Kutta methods. Even if general linear methods cannot be symplectic (see [3]), it is possible to lead them inherit a nearly canonical behavior
from their nonlinear stability properties. This is done by imposing a further algebraic constraint on their coecient matrices, known as G-symplecticity
[1], which is a rst requirement to obtain an accurate conservation of the invariants of an Hamiltonian problem. Special attention will be given to the
numerical treatment of separable Hamiltonian problems: to this purpose, the family of G-symplectic partitioned general linear methods is introduced [2]. Due to their multivalue nature, partitioned general linear methods generate parasitic components of the numerical solution which needs to be properly removed: we discuss how G-symplectic partitioned general linear methods free from parasitism can be constructed. We also consider the eects of G-symplecticity on the order of convergence of the derived methods, by exploiting the theory of B-series. Numerical experiments on a selection of separable Hamiltonian problems are discussed. This is a joint work with J. C. Butcher from the University of Auckland
(New Zealand). [1] J. C. Butcher 2008 Numerical methods for Ordinary Dierential Equations, Second Edition, Wiley. [2] J. C. Butcher, R. D'Ambrosio, Partitioned general linear methods for separable Hamiltonian problems, in preparation. [3] J. C. Butcher and L. L. Hewitt 2009 The existence of symplectic general linear methods, Numer. Algor. 51, 77-84
Aleiodes spurivena Quicke & Butcher 2011
No full text<i>Aleiodes spurivena</i> Quicke & Butcher, 2011 <p>(Fig. 165A,B)</p> <p>Material examined. 2 paratype females, Thailand, Ranong Province, 7 km N of Ranong, Ch 9 TV relay station, 25–29.xi.1991, 350– 500m, I. J. Kitching & A. M. Cotton (BMNH).</p> <p>Notes. Apparently widely distributed from India and Nepal to Vietnam and Thailand.</p>Published as part of <i>Butcher, Buntika Areekul, Smith, M. Alex, Sharkey, Mike J. & Quicke, Donald L. J., 2012, A turbo-taxonomic study of Thai Aleiodes (Aleiodes) and Aleiodes (Arcaleiodes) (Hymenoptera: Braconidae: Rogadinae) based largely on COI barcoded specimens, with rapid descriptions of 179 new species, pp. 1-232 in Zootaxa 3457</i> on page 199, DOI: 10.11646/ZOOTAXA.3457.1.1, <a href="http://zenodo.org/record/10832362">http://zenodo.org/record/10832362</a>
Deane-Butcher, J H, 1730803
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/381300Surname: DEANE-BUTCHER. Given Name(s) or Initials: J H. Military Service Number or Last Known Location: 1730803. Missing, Wounded and Prisoner of War Enquiry Card Index Number: SEA-1931.197321
Item: [2016.0049.13593] "Deane-Butcher, J H, 1730803
Aleiodes (Hemigyroneuron) roberti Areekul-Butcher & Quicke 2011
No full text<i>Aleiodes</i> (<i>Hemigyroneuron</i>) <i>roberti</i> Areekul-Butcher & Quicke, 2011 <p>(Fig. 165C–E)</p> <p>Material examined. Holotype ♂, Thailand, Srinakarin Dam, 15–17.v.2009, B. Butcher (voucher CNIN229) (CUMZ).</p>Published as part of <i>Butcher, Buntika Areekul, Smith, M. Alex, Sharkey, Mike J. & Quicke, Donald L. J., 2012, A turbo-taxonomic study of Thai Aleiodes (Aleiodes) and Aleiodes (Arcaleiodes) (Hymenoptera: Braconidae: Rogadinae) based largely on COI barcoded specimens, with rapid descriptions of 179 new species, pp. 1-232 in Zootaxa 3457</i> on page 189, DOI: 10.11646/ZOOTAXA.3457.1.1, <a href="http://zenodo.org/record/10832362">http://zenodo.org/record/10832362</a>
Butcher, W H J, 432749
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/375132Surname: BUTCHER
Given Name(s) or Initials: W H J
Military Service Number or Last Known Location: 432749
Missing, Wounded and Prisoner of War Enquiry Card Index Number: 56139187443
Item: [2016.0049.07440] "Butcher, W H J, 432749
Gondwanocentrus Quicke & Butcher, gen. nov.
No full textGondwanocentrus Quicke & Butcher gen. nov. Figs 1–8. Antennae with fewer than 20 flagellomeres. Terminal flagellomere pointed but not acuminate, wider than basal flagellomeres. Basal flagellomeres elongate and narrower than distal ones. Pedicellus large, approximately half length of scapus. Head coarsely sculptured. Eyes completely glabrous. Face transversely striate, roundly bulging. Hypoclypeal depression dorsally rounded. Malar suture absent. Maxillary and labial palps with 6 and 4 segments, respectively. Frons not depressed behind antennal sockets, flat. Ocelli small. Occipital carina complete, ventrally joining hypostomal carina far from base of mandible. Pronotum formed into a short ‘neck’. Mesosoma largely coarsely sculptured. Propleuron with posterior flange. Notauli narrow, distinctly impressed at anterior. Scutoscutellar suture complete. Scutellar sulcus wide with string medial carina. Scutellum with lateral carinae. Epicnemial carina complete. Precoxal sulcus deep, oblong, coarsely foveate. Metanotum with complete midlongitudinal carina; posterior margin not protruding. Propodeum sharply angled in lateral view, with short midanterior carina that divides to form pair of curved carinae and these are met by a pair of submedial carinae making a hard-to-discern areola; sublateral carinae short, forming a weak apophysis; lateral carinae distinct. Fore wing: pterostigma large; vein r-rs issuing from distinctly beyond the middle, perpendicular; 2 nd submarginal cell long, distinctly narrowing distally; vein 1 RS well developed; vein (RS+M) a sinuate, particularly strongly curved distally; vein 1 rs-m not tubular or pigmented; m-cu antefurcal; M+CU completely tubular and weakly sinuate; 1 cu- a postfurcal; 2 cu-a present. Hind wing: vein M+CU slightly longer than 1 -M. Coxae coarsely sculptured. Tarsi not shortened. Hind tibia without striate sculpture medio-laterally; apico-medially with moderately developed comb of setae but these not adpressed. Claws with small rounded basal lobes and with pecten. Hind coxa coarsely sculptured. Tergites 1–3 sculptured, largely concealing more posterior tergites; with complete lateral crease. Tergite 3 curved in dorsal profile with narrow lamelliform posterior margin. Ovipositor moderately exserted, needle-like. Type species. Gondwanocentrus humphriesi Butcher & Quicke sp. nov. Etymology. Name derived from ‘Gondwana’ and ‘ Mesocentrus’ in reference to the distribution and affinity between the genera. Gender: masculine.Published as part of Quicke, Donald L. J. & Butcher, Buntika A., 2015, Description of a new Betylobraconini-like parasitoid wasp genus and species (Hymenoptera: Braconidae: Rogadinae) from Chile, pp. 459-466 in Zootaxa 4021 (3) on pages 460-461, DOI: 10.11646/zootaxa.4021.3.5, http://zenodo.org/record/24092
Gondwanocentrus humphriesi Butcher & Quicke, sp. nov.
No full textGondwanocentrus humphriesi Butcher & Quicke sp. nov. Material examined. 1 Female, CHILE, Region ×, Parc Nacional Puyehue Anticura Sendero Repucura, sweeping in Nothofagus /Cusqueira forest, 447m, 17.ii.2005, 40º 39 ’ 53 ”S 70 º 10 ’ 02”W. Description. Body length 2.8 mm, fore wing 2.6 mm and exserted part of ovipositor 0.5 mm. Flagellum with 14 segments. Terminal flagellomere 1.5 × wider than 1 st. Apical three flagellar segments distinctly swollen and wider than rest of flagellum. First flagellomere 1.1 × longer than both the 2 nd and 3 rd separately; 3.6 × longer than wide. Face without midlongitudinal ridge, strongly transversely striate. Frons, occiput and temples coarsely rugose. Distance between posterior ocelli: transverse diameter of posterior ocellus: shortest distance between posterior ocellus and eye = 3: 1: 3. Temples wide and rounded. Pronotum forming a short but distinct neck. Mesosoma 1.7 × longer than high, largely setose (Fig. 6). Forewing: pterostigma 4 × longer than maximally wide; lengths of r-rs: 3 RSa: 3 RSb = 1.0: 2.7: 3.7; vein 1 CUa: 1 Cub = 1.0: 2.1 (Fig. 5). Hind wing: vein M+CU 1.25 × longer than 1 -M; vein m-cu slightly postfurcal. Fore femur with fine transverse sculpture, 4.5 × longer than maximally deep. Fore tibia 1.1 × longer than fore tarsus. Fore basitarsus 5 × longer than deep, 0.33 × length of whole tarsus. Hind coxa coarsely sculptured, transversely striate posterodorsally. Hind femur: tibia: tarsus: basitarsus = 0.85: 1.0: 0.85: 0.3. Hind basitarsus 0.25 × length of whole tarsus. First metasomal tergite longitudinally striate, basally with curved carinae that do not meet medially. 2 nd and 3 rd tergites largely coriaceous but with sculpture tending to form longitudinal parallel lines. 2 nd tergite with a very small mid-basal triangular area that is produced medially into a weak but distinct mid-longitudinal carina. Colour. Largely black; face, top of head, mesoscutum largely (except margins) red-brown; legs and palps yellowish; wings clear with pale brown venation. Male. Unknown. Biology. Unknown. Etymology. Named in honour of the delightfully inquisitorial Mr John Humphries, who during an interview with the junior author for the BBC Radio 4 Today Programme suggested it might be nice to have a species named after himself.Published as part of Quicke, Donald L. J. & Butcher, Buntika A., 2015, Description of a new Betylobraconini-like parasitoid wasp genus and species (Hymenoptera: Braconidae: Rogadinae) from Chile, pp. 459-466 in Zootaxa 4021 (3) on pages 462-463, DOI: 10.11646/zootaxa.4021.3.5, http://zenodo.org/record/24092
Cyranorogas depardieui Quicke and Butcher 2015, sp. nov.
No full textC. depardieui Quicke and Butcher sp. nov. (Figures 1–3) Holotype ♀, Papua-New-Guinea, Province Madang, Mt Wilhelm 1700 m (−5.759269,145.2356), 28–29/10/2012, leg Valeba, Tulei, Novotny, Leponce, Plot 4, understorey; Malaise – MAL-MW1700D-04/16-d04. Length of body 3 mm. Antenna with 25 flagellomeres. Median flagellomeres approximately 1.9× longer than wide. Length of fore wing 3 mm. Precoxal sulcus, deep, rather short, crenulate, located rather low down side of mesopleuron. Scutellar sulcus wide, deep, curved, with six strong carinae between outer ones. Mesopleuron largely smooth and shiny. Propodeum with midlongitudinal carina on anterior 0.7, where it divides to form a weak transverse carina, and posteror to this propodeum irregularly rugose. Body largely honey-yellow, posterior of propodeum, base of hind coxa narrowly, metasomal tergites 1 and 2 and basal part of tergum 3 white. Wings hyaline with brown venation. Etymology. Named in honour of the actor Gérard Depardieu who played Cyrano de Bergerac in the 1990 film adaptation.Published as part of Butcher, Buntika A. & Quicke, Donald L. J., 2015, A remarkable new genus and species of Rogadinae (Hymenoptera: Braconidae) of uncertain tribal placement, from Papua New Guinea, resembling Betylobraconini stat. nov., pp. 2045-2054 in Journal of Natural History 49 (33) on page 2047, DOI: 10.1080/00222933.2015.1009405, http://zenodo.org/record/399800
Aleiodes probuzurae Butcher, Smith, Sharkey & Quicke, 2012, sp. nov.
No full text<i>Aleiodes probuzurae</i> sp. nov. <p>(Fig. 138)</p> <p>Holotype ♂, Thailand, Chonburi Province, Khao Kaew open zoo, 28–29.vi.2008, R. & B. Butcher (voucher BCLDQ01202, Genbank HM435162) (CUMZ).</p> <p>Paratypes: 1 ♂, Thailand, Chonburi, Si Chang, 29.vi.08, B. Butcher (voucher BB0011, Genbank HQ551249) (CUMZ).</p> <p>Body length 4.2 mm, fore wing length 3.7 mm and antenna length 4.6 mm.</p> <p> Antenna with 38 flagellomeres. Terminal flagellomere elongate and acuminate. Occiput aciculate with distinct transverse striation. Occipital carina broadly absent mediodorsally, ventrally joining hypostomal carina. Mesopleuron largely aciculate, anteriorly and dorsally rugose, precoxal sulcus weakly impressed, strongly rugose, specular area aciculate. Midlongitudinal carina of propodeum complete. Fore wing vein 2-CU1 1.5 x 1-CU1. Apex of fore wing subbasal cell evenly setose. Fore wing vein 3-SR 2.05 x vein r. Fore wing vein 2-SR+M 0.8 x vein r. Fore wing vein SR1 2.2 x vein 3-SR. Hind wing vein M+CU 1.65 x 1-M. Hind wing subbasal cell evenly setose. Hind wing vein m-cu present, tubular basally, antefurcal, reclivous. Hind coxa with a trace of oblique ridges on basal half dorsally and medially. Apex of hind tibia without comb of modified adpressed setae. Claws without conspicuous pecten. Basal lobes of 1 st tergite moderately produced, angular, steeply concave posteriorly. Midlongitudinal carina of 3 rd tergite complete.</p> <p> Etymology. From ‘pro’ and buzurae in reference to it not being quite so morphologically derived as <i>A. buzurae</i>.</p> <p>Note. In addition to the type specimens, a third individual from Chiang Rai, Mae Fah Luang University Campus, grassy area near secondary woodland, 20-Jul-09, Quicke, Butcher & Butcher (voucher BCLDQ01301, Genbank HM435219) with identical DNA sequence can not be located.</p>Published as part of <i>Butcher, Buntika Areekul, Smith, M. Alex, Sharkey, Mike J. & Quicke, Donald L. J., 2012, A turbo-taxonomic study of Thai Aleiodes (Aleiodes) and Aleiodes (Arcaleiodes) (Hymenoptera: Braconidae: Rogadinae) based largely on COI barcoded specimens, with rapid descriptions of 179 new species, pp. 1-232 in Zootaxa 3457</i> on pages 170-171, DOI: 10.11646/ZOOTAXA.3457.1.1, <a href="http://zenodo.org/record/10832362">http://zenodo.org/record/10832362</a>
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