251,244 research outputs found
Using C-Tool to simulate soil carbon and radiocarbon development
No full textTho model framework C-TOOL was used to simulate soil carbon and radiocarbon development. A simple three-compartment model was sufficient for describing the data
Olhos, mãos e rostos: a produção pictórica de Eduardo Dias na Florianópolis de 1890 a 1940
Get PDFDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Filosofia e Ciências HumanasEste escrito é um estudo pelas evidências deixadas através das imagens em telas pelo pintor Eduardo Dias em uma Florianópolis correspondente ao período entre os anos de 1890 a 1940. Essas pinturas tornaram-se indícios de uma arte permanecida pelos olhos e mãos de um pintor preocupado em registrar a sua cidade e os rostos de seus habitantes. A iniciativa do artista abriu mais uma fresta de observação do passado através da sensibilidade peculiar de seus traços, cores e formas
Completely Positive Maps on Some C*-Algebras
Get PDFCompletely positive maps on the C*-algebra of the canonical anticommutation relations induced by contractions on the underlying Hilbert space are investigated and a Stinespring decomposition exhibited. These maps are used to construct examples of dynamical semi-groups; their explicit Stinespring decompositions yield unitary dilations. The relation of this work with earlier results on the C*-algebra of the canonical commutation relations is discussed
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
The Extension Of Chiral Gravity To SL(2, C)
Get PDFThe canonical transformation of the phase space of general relativity introduced by Ashtekar is extended from an su(2) gauge field to sl(2, C). The momenta conjugate to the chiral spin connection become complex, holomorphic variables. It is shown how the symplectic structure of Ashtekar’s variables is preserved under Lorentz boosts
Mitomycin C in highly myopic eyes - Author reply
No full textOphthalmology. 2005 Feb;112(2):208-18; discussion 219.
Mitomycin C modulation of corneal wound healing after photorefractive keratectomy in highly myopic eyes.
Gambato C, Ghirlando A, Moretto E, Busato F, Midena E.
SourceRefractive Surgery Service and Antimetabolite Therapy Research Unit, Department of Ophthalmology, University of Padova, Padova, Italy.
Abstract
PURPOSE: To evaluate the role of topical mitomycin C in corneal wound healing (CWH) after photorefractive keratectomy (PRK) in highly myopic eyes.
DESIGN: Prospective, double-masked, randomized clinical trial.
PARTICIPANTS: Seventy-two eyes of 36 patients affected by high (>7 diopters) myopia.
METHODS: In each patient, one eye was randomly assigned to PRK with intraoperative topical 0.02% mitomycin C application, and the fellow eye was treated with a placebo. Postoperatively, mitomycin C-treated eyes received artificial tears (3 times daily, tapered in 3 months), whereas the fellow eye was treated with fluorometholone sodium 2% and artificial tears (3 times daily, tapered in 3 months).
MAIN OUTCOME MEASURES: Uncorrected visual acuity (UCVA) and best-corrected visual acuity (BCVA), contrast sensitivity, manifest refraction, and biomicroscopy. Contrast sensitivity was determined using the Pelli-Robson chart. Corneal confocal microscopy documented CWH.
RESULTS: Mean follow-up was 18 months (range, 12-36). No side effects or toxic effects were documented. At 12-month follow-up examination, UCVAs (logarithm of the minimum angle of resolution) were 0.4+/-0.48 and 0.5+/-0.53 (P = .03) in mitomycin C-treated eyes and corticosteroid-treated eyes, respectively. At 1 year, corneal haze developed in 20% of corticosteroid-treated eyes, versus 0% of mitomycin C-treated eyes. At 12, 24, and 36 months, corneal confocal microscopy showed activated keratocytes and extracellular matrix significantly more evident in untreated eyes (Ps = 0.004, 0.024, and 0.046, respectively).
CONCLUSION: Topical intraoperative application of 0.02% mitomycin C can reduce haze formation in highly myopic eyes undergoing PRK.
Comment in
Ophthalmology. 2006 Feb;113(2):357; author reply 357-8
Mean-Field Dynamical Semigroups on C*-Algebras
Get PDFWe study a notion of the mean-field limit of a sequence of dynamical semigroups on the n-fold tensor products of a C*-algebra A with itself. In analogy with the theory of semigroups on Banach spaces we give abstract conditions for the existence of these limits. These conditions are verified in the case of semigroups whose generators are determined by the successive resymmetrizations of a fixed operator, as well as generators which can be approximated by generators of this type. This includes the time evolutions of the mean-field versions of quantum lattice systems. In these cases the limiting dynamical semigroup is given by a continuous flow on the state space of A. For a class of such flows we show stability by constructing a Liapunov function. We also give examples where the limiting evolution is given by a diffusion, rather than a flow on the state space of A
Cymodusa ypy Onody & Penteado-Dias 2019, sp. nov.
No full textCymodusa ypy Onody & Penteado-Dias, sp. nov. (Figures 1–9) Material examined. Holotype: BRAZIL. São Paulo: 1 ♀ (# DCBU 28233), São Carlos, Fazenda Jacutinga, 21 o 50’S 47 o 53’W, Armadilha Malaise, 17.ii.2008, A. M. Penteado-Dias col. Paratypes: BRAZIL. Goiás: 2 ♀ (# MZSP 21105, 21106), Uruaçu, Serra da Mesa Survey, 14°16.9’S 48°55.7’W, along permanente stream, N. F. Johnson col., YPT, 26.v.1996 and 31.v.1996.; Mato Grosso do Sul: 1 ♀ (# MZSP 52514), Bodoquena, Fazenda Califórnia, 20°41’55.9’’S 56°52’49.4’’W, Malaise 6, 6-22.xii.2011, C. Lamas, S. Nihei, eq. col.; 7 ♀, 9 ♂ (# DCBU 83948, 83958, 83959, 83963, 83992, 83993, 83995, 83998, 83969, 84011, 84037- 84039, 84042, 85543, 85553), Campo Grande, Fazenda Escola UCDB, Pasto, 20 o 24’13.16’’S 54 o 36’45.69’’W, Armadilha Malaise 1, 01-30.iv.2010, J. B. B. Oliveira col.; 1 ♀, 5 ♂ (# DCBU 84663, 84666, 84670, 84676; # MZSP 57565, 57566) same data except 20 o 24’9.60’’S 54 o 36’47.32’’W, Armadilha Malaise 2; Minas Gerais: 1 ♀ (# DCBU 151327), Santana do Riacho, PARNA da Serra do Cipó, 19 o 21’10.2’’S 43 o 36’24.5’’W, 786 m, Armadilha Malaise, 20.iii.2009, M. O. Gonzaga col.; 1 ♀ (# DCBU 143384), Timóteo, Parque Estadual do Rio Doce, 19 o 39’30.7’’S 42 o 34’32.2’’W, 266 m, Armadilha Malaise, 19.iv.2011, A. J. Santos col.; SÃO PAULO: 1 ♀ (# DCBU 121748), Luiz Antônio, ESEC de Jataí, 21 o 36.58’S 47 o 48.24’W, Armadilha Malaise 0 1, 538 m, 15.ii.2014, A. S. Soares col; 1 ♀ (# DCBU 121766), same data except 20.vi.2014; 2 ♀ (# DCBU 224704, 224706), same data except 11.ix.2014; 1 ♀ (# MZSP 57567), same data except 05.ii.2015; 0 1 ♀ (# DCBU 17996), Jaboticabal, UNESP, Horto Florestal, Mata Ciliar, 21 o 14’8.7’’S 48 o 17’4.8’’W, Armadilha Malaise, 11.xii.2008, C. Araújo col.; 4 ♀ (# DCBU 106706-106709), Matão, Fazenda Cambuhy, 21 o 37’43.6’’S 48 o 32’43.6’’W, Armadilha Malaise 0 5, 542 m, 04.i.2010, A. M. Penteado-Dias col.; 1 ♀ (# DCBU 62285), Pontal, Usina Bela Vista, 20 o 54’48’’S 48 o 08’0.3’’W, Armadilha Malaise, 11.xi.2010, I. F. Melo col.; 1 ♀ (# DCBU 17967), Rio Claro, Usina Pq. Do Corumbataí, 20 o 27’06’’S 47 o 35’32’’W, Armadilha Malaise, 22.xi.2009, A. M. Penteado Dias col.; 23 ♀, 22 ♂ (# DCBU 28234-28260, 28332-28348), São Carlos, Fazenda Jacutinga, 21 o 50’S 47 o 53’W, Armadilha Malaise, 17.ii.2008, A. M. Penteado-Dias col.; 10 ♀, 6 ♂ (# DCBU 17957-17961, 17970-17973, 17975-17979; # MZSP 57569, 57570), same data except Fazenda Vale do Quilombo, Mata, 21 o 50’50’’S 47 o 47’12’’W, 18.ii.2009, E.M. Shimbori col.; 1 ♀ (# DCBU 178037), same data except Fazenda Canchim, EMBRAPA, 21 o 57.78’S 47 o 51’W, Armadilha Malaise 0 2, 876 m, 01.viii.2011, C. S. Souza e eq. col; 1 ♀ (# MZSP 57568), same data except Mata Sede, Armadilha Moericke, 1-5.viii.2013, A. S. Soares & L. A. M. cols.; 1 ♀ (# DCBU 139393), same data except sentido reflorestamento, Armadilha Moericke 0 2, 870 m, 26-29.v.2014, A. S. Soares e eq. cols. Description. Female (Fig. 1). Fore wing length 3.7–5.0 mm. Head. Head mostly coriaceous, punctate, frons coriaceous to rugose; antenna with 34–36 flagellomeres, first flagellomere 5.0 × as long as width and 1.5 × as long as the second flagellomere; occipital carina complete, meeting hypostomal carina before mandible base and distant from lateral ocelli 1.5 × their diameter; eyes hairy and strongly convergent ventrad (Fig. 3); lateral ocellus separated from eye and distance between lateral ocelli by 1.0 × their diameter; tentorial pit touching inner margin of eye; malar space short, base of mandible nearly touching lower eye margin; mandibles short, upper tooth as long as the lower tooth; apical margin of clypeus rounded and weakly convex; gena narrow. Mesosoma. Mesosoma mostly coriaceous, punctate, except lower part of pronotum and upper part of mesopleuron striate and propodeum rugose; epomia present; mesoscutum without notaulus (Fig. 5); scutellum without lateral carina; epicnemial carina present, reaching 0.5 posterior margin of pronotum; sternaulus distinct anteriorly (Fig. 6); mesopleural fovea strong; propodeum long, with apex projecting between bases of hind coxae less 0.5 × the length of hind coxa, basal area and areola separated by anterior transverse carina, petiolar and superomedia areas not separated and elongate (Fig. 7), spiracle small, round and distant from pleural carina by 1.0 × its own diameter; fore wing without areolet, vein cu-a slightly distad Rs&M, vein 2m-cu with one bulla; hind wing with Cu1 and distal abscissa of 1A absent, first abscissa of Rs as long as 1rs-m, four distal hamuli; legs with tarsal claws pectinate only at the base. Metasoma. Metasoma mostly coriaceous; first tergite smooth at its base and apex, 5.0 × as long as posteriorly broad; second tergite 4.0 × as long as wide, tyridium separated from the base of the second tergite by 4.3 × its length (Fig. 8); sixth and seventh tergites deeply emarginate apically; ovipositor 1.3 × as long as the hind tibia. Coloration. Predominantly black. Mandibles (except their apex), palpi and tegulae yellowish white. Anterior and mid legs with coxa, trochanter and trochantellus yellowish white, last tarsomere brown and remaining segments orange. Posterior legs with coxa and trochanter (except their yellowish white apex) black, trochantellus and tibial spurs yellowish white, femur and tibia orange brown, tarsus brown. Tergites I-III black, tergites II and III apically and laterally orange, and the remaining tergites orange brown to brown. Ovipositor sheaths dark brown. Wings hyaline, pterostigma brown. Male (Fig. 2). Similar to female in structure and color except: eyes not strongly convergent, sometimes not so hairy, and tentorial pit distant from the inner margin of eye (Fig. 4); first flagellomere 3-4 × as long as width; darker abdomen, but tergites II and III orange to orange brown at least laterally. Distribution. BRAZIL: Goiás, Mato Grosso do Sul, Minas Gerais and São Paulo States (Fig. 9). Host. Unknown. Etymology. The specific name derives from Tupy language (y py = the first) in reference to the fact that this is the first species of the genus to be formally described for Brazil. Comments. The new species fits well within the diagnosis of the Cymodusa genus (see Introduction) and seems to belong to the “ melanocera ” group proposed by Sanborne (1986) with females having eyes very strongly converging ventrad, tentorial pit touching inner margin of eye, and antennal flagellum uniformly black. Cymodusa ypy sp nov. differs from the similar species, C. nicolei, and from the other two Neotropical species, C. melanocera and C. montana, by the following combination of characters: first flagellomere 5.0 × as long as wide; areolet absent in fore wing; propodeal carination well developed, areola and basal area of propodeum not confluent; tergite II 4.0 × as long as wide and tergites VI and VII deeply emarginate in dorsal view; antenna uniformly black; fore and mid coxae and trochanters light yellow; tergites II and III orange to orange brown, at least laterally. The record of this new species extends significantly the distribution range for the genus in South America, where it was previously only known from Ecuador. In Brazil, Cymodusa ypy sp nov. occurs in the central and southeastern regions of the country, including areas of Atlantic Forest, Brazilian Savanna (Cerrado) and Pantanal biomes, and is also found in agroecosystems.Published as part of Onody, Helena C. & Penteado-Dias, Angélica Maria, 2019, Description of the first species of Cymodusa Holmgren from Brazil (Hymenoptera, Ichneumonidae, Campopleginae), pp. 434-440 in Zootaxa 4545 (3) on pages 435-437, DOI: 10.11646/zootaxa.4545.3.7, http://zenodo.org/record/261899
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Flat Partial Connections end Holomorphic Structures in C^∞ Introduction Vector Bundles
Get PDFThe notion of a flat partial connection D in a C^∞ vector bundle E, defined on an integrable sub-bundle F of the complexified tangent bundle of a manifold X is defined. It is shown that E can be trivialized by local sections s satisfying Ds = 0. The sheaf of germs of sections s of E satisfying Ds = 0 has a natural fine resolution, giving the de Rham and Dolbeault resolutions as special cases. If X is a complex manifold and F the tangents of type (0,1), the flat partial connections in a C^∞ vector bundle E are put in correspondence with the holomorphic structures in E. If X, E are homogeneous and F invariant, then invariant flat connections in E can be characterised as extensions of the representation of the isomorphic subgroup to which E is associated, extending results of Tirao and Wolf in the holomorphic case
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