169,861 research outputs found
Heliangelus regalis subsp. johnsoni Graves, Lane, O'Neill & Valqui, 2011, new subspecies
No full textHeliangelus regalis johnsoni new subspecies Holotype. Museo de Historia Natural de la Universidad Nacional Mayor de San Marcos (MUSM), No. 22613. Adult male from about 86 km SE of Juanjuí (7 o 34 ’S; 75 o 55 ’ W; ca 1400 m above sea level) on the east bank of the Río Pauya, Department of Loreto, Peru. Collected and prepared by Manuel Sánchez S. (field number 3647) on 22 July 2000. Diagnosis. Males of johnsoni differ from those of nominate regalis in exhibiting intense indigo iridescence, particularly on the crown, throat, and upper breast. These parts are bluish-black to violet-black with only slight iridescence in nominate regalis. Rectrices of both sexes of johnsoni are metallic indigo rather than metallic violetpurple as in nominate regalis. Description of holotype. Body plumage is bluish-black, displaying strong indigo iridescence on the crown, throat, and upper breast, especially when viewed head-on (Fig. 2). Rectrices are metallic indigo on ventral and dorsal surfaces, bluer distally. Inner vanes of rectrices are flushed with violet-purple. Primaries and outer secondaries are brownish-black showing faint violet iridescence. Inner secondaries exhibit violet-purple iridescence. Scattered feathers on carpal edge of wing are tipped with rufous. Downy feathers on lower flanks and around vent are tipped white. Bill and feet are black. Measurements (mm) of holotype. See Table 1. Weight: 3.7 g. Testes: 3 x 4 mm. Maxillary ramphotheca smooth. Paratypes. (a) LSUMZ 170735, subadult male. PERU: Department of Loreto; ca 85 km SE of Juanjuí on E bank upper Río Pauya, 7 ° 34 ’ S, 75 ° 54 ’ W, ca 1700 m. Collected and prepared by Daniel F. Lane (field number 1291) on 27 June 2000. Iridescence of breast, flanks, and belly plumage is a slightly deeper shade of indigo than in the holotype. Feathers of the back, scapulars, and upper rump are narrowly edged with green. Weight 3.4 g. FIGURE 3. Distribution of the Royal Sunangel (Heliangelus regalis) in the Andes Mountains of Peru and Ecuador: H. regalis regalis (yellow circles); H. regalis johnsoni (green circle); published sight records, subspecies unknown (blue circles). Symbols may cover two or more closely spaced localities: (1) Yankuam Lodge, Prov. Zamora-Chinchipe (4 o 15 ' S; 78 o 37 ' W) (Freile, et al., 2011; Krabbe & Ahlman, 2009); (2) San Jose de Lourdes, Dpt. Cajamarca (5 o 02' S; 78 o 51 ' W) (Fitzpatrick, et al., 1979); (3) Duran, Dpt. Amazonas (5 o 16 ' S; 78 o 20 ' W) (Dauphiné, et al., 2008); (4) San Cristobal, Dpt. Amazonas (5 o 50 ' S; 78 o 13 ' W) (Seddon, et al., 1996); (5) Garcia, Dpt. San Martín (5 o 40 ’S; 77 o 46 ’W) (Hornbuckle, 1999); (6) NE Jirillo, Dpt. San Martín (6 o 03' S; 76 o 44 ' W) (Davis, 1986); (7) Sianbal, Dpt. San Martín (6 o 43 ' S; 76 o 06' W) (Merkord, et al., 2009); (8) Pauya, Dpt. Loreto (7 o 34 ' S; 75 o 54 ' W) (Schulenberg, et al., 2001). (b) LSUMZ 170736, adult male. PERU: Department of Loreto; ca 80 km SE of Juanjuí on E bank upper Río Pauya, 7 ° 34 ’ S, 75 ° 54 ’ W, ca 1600 m. Collected and prepared by Thomas Valqui (field number 65) on 27 June 2000. Nearly identical to the holotype but indigo iridescence on crown, throat and upper breast is slightly paler. Weight 3.6 g. (c) LSUMZ 170737, adult female. PERU: Department of Loreto; ca 80 km SE of Juanjuí on E bank upper Río Pauya, 7 ° 35 ’ S, 75 ° 53 ’ W, ca 1700 m. Collected and prepared by J. W. Armacost (field number 109) on 13 July 2000. Weight 4.4 g. Females exhibit considerable individual variation, some of which may be related to age. Sample sizes were insufficient to characterize possible body plumage color differences between female H. r. regalis and H. r. johnsoni. (d) LSUMZ 170738, adult female. PERU: Department of Loreto; ca 86 km SE of Juanjuí on E bank upper Río Pauya, 7 ° 33 ’ S, 75 ° 55 ’ W, ca 1400 m. Collected and prepared by Daniel F. Lane (field number 1386) on 19 July 2000. Weight 3.8 g. (e) MUSM 22615, adult male. PERU: Department of Loreto; ca 80 km SE of Juanjuí on E bank upper Río Pauya, 7 ° 34 ’ S, 75 ° 54 ’ W, ca 1700 m. Collected by Abraham Urbay T. and prepared by Daniel F. Lane (field number 1350) on 11 July 2000. Nearly identical to holotype but indigo iridescence on crown, throat and upper breast is slightly paler. Weight 3.6 g. (f) MUSM 22611, adult female. PERU: Department of Loreto; ca 80 km SE of Juanjuí on E bank upper Río Pauya, 7 ° 34 ’ S, 75 ° 55 ’ W, ca 1740 m. Collected and prepared by Thomas Valqui (field number 76) on 30 June 2000. Weight 3.4 g. Table 1. Selected measurements (lengths) of specimens of Heliangelus regalis regalis and Heliangelus r. johnsoni. Localities: (1) Peru: Department of Cajamarca; E side of ridge ENE above San José de Lourdes, 1950-2200 m; (2) Peru: Department of San Martín: ca 20 km by trail Jirillo on trail towards Balsapuerto, 1450 m; (3) Peru: Department of Loreto; ca 80-86 km SE Juanjuí on E bank of upper Río Pauya, 1400– 1740 m. a Traces of subadult plumage. AMNH = American Museum of Natural History; LSUMZ = Louisiana State University Museum of Zoology Other specimens examined. Heliangelus r. regalis: PERU: Department of Cajamarca; E side of ridge ENE above San José de Lourdes, 5 o 02' S, 78 o 51 ' W, 1950–2200 m (AMNH 823987 [holotype], male; AMNH 823988, male; AMNH 823989, female; LSUMZ 81848, female; LSUMZ 81849, male; LSUMZ 81850, male; LSUMZ 81851, male; LSUMZ 81852, female; LSUMZ 81853, female; USNM 81847, male); Department of San Martín: ca 20 km by trail NE Jirillo on trail towards Balsapuerto, 6 o 03' S, 76 o 44 ' W, 1450 m (LSUMZ 116681, male; LSUMZ 116682, male). Etymology. We take pleasure in naming this beautiful new taxon for the late Ned K. Johnson (University of California, Berkeley) in recognition of his many contributions to avian systematics and biogeography. Distribution. Recent fieldwork in southern Ecuador (Krabbe & Ahlman, 2009; Freile, et al., 2011) and Peru (Schulenberg, et al., 2001; Dauphiné, et al., 2008; Merkord, et al., 2009) brings to eight the number of known populations of Heliangelus regalis (Fig. 3). Five of the eight localities are represented only by sight records or photographs. So far as is known, Heliangelus r. johnsoni is restricted to the Cordillera Azul; however, the geographic range of this well-differentiated subspecies likely extends north and well south of the type locality. H. regalis has a relatively wide altitudinal range (1250–2200 m) compared to other species of hummingbirds with restricted geographic ranges in the Peruvian Andes (Graves, 1985). Reports at lower altitudes (550–700 m) in the Cordillara Colán (Dauphiné, et al., 2008) are well outside the documented altitudinal range of Heliangelus regalis and should be regarded as questionable until specimens or diagnostic photographs are obtained. The species reaches its greatest abundance in habitat variously described as brushy slopes bordered by cloud forest (Fitzpatrick, et al., 1979), elfin scrub (Seddon, et al., 1996), stunted forest (Hornbuckle, 1999; Schulenberg, et al., 2001), stunted shrubland (Freile, et al., 2011), and mossy stunted forest (Davis, 1986).Published as part of Graves, Gary R., Lane, Daniel F., O'Neill, John P. & Valqui, Thomas, 2011, A distinctive new subspecies of the Royal Sunangel (Aves: Trochiliformes; Heliangelus regalis) from the Cordillera Azul, northern Peru, pp. 52-58 in Zootaxa 3002 on pages 53-57, DOI: 10.5281/zenodo.20679
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
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
The Dixmier conjecture and the shape of possible counterexamples
No full textWe establish a lower bound for the size of possible counterexamples of the Dixmier Conjecture. We prove that B > 15, where B is the minimum of the greatest common divisor of the total degrees of P and Q , where ( P , Q ) runs over the counterexamples of the Dixmier Conjecture.Fil: Guccione, Juan Jose. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Matemática; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Investigaciones Matemáticas "Luis A. Santaló"; ArgentinaFil: Guccione, Juan Jose. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Matemática; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Saavedra 15. Instituto Argentino de Matemática; ArgentinaFil: Valqui, Christian. Pontificia Universidad Católica del Perú; Perú. Instituto de Matemática y Ciencias Afines; Per
Dispelling the Myths Behind First-author Citation Counts
No full textWe 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
A Multi-Language Comparison of Influences on Author Verification using Character N-Grams
No full textWe create a new multi-language corpus for author verification based on Wikipedia talkpages, and evaluate the influence that differences in topic and time have on character n-gram author profiles. Topic alignment between two texts is found to increase author verification precision, and an authors writing style is found to change over time, but not more significantly after 3 years than after 1 year.Information ArchitectureWISElectrical Engineering, Mathematics and Computer Scienc
A 0.12mm<sup>2</sup> Wien-Bridge Temperature Sensor with 0.1°C (3σ) Inaccuracy from -40°C to 180°C
No full text Resistor-based temperature sensors can achieve much higher resolution and energy efficiency than conventional BJT-based sensors [1], but they typically occupy more area (> 0.25 mm 2 ) and have lower operating temperatures (le 125 {circ} {C}) [2]-[4]. This work describes a 0.12mm 2 resistor-based sensor that uses a Wien-bridge (WB) filter to achieve 0.1 {circ} {C} (3 sigma) inaccuracy from - 40 {circ} {C} to 180 {circ} {C}. Compared to a state-of-the-art WB sensor [4], it occupies 6 × less area and achieves comparable relative accuracy over a 76% wider operating range. Session 10.3 Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic InstrumentationMicroelectronic
A ±25A Versatile Shunt-Based Current Sensor with 10kHz Bandwidth and ±0.25% Gain Error from -40°C to 85°C Using 2-Current Calibration
No full textAccurate current sensing is critical in many industrial applications, such as battery management and motor control. Precise shunt-based current sensors have been reported with gain errors of less than 1% over the industrial temperature range (-40°C to 85°C) [1]–[4]. However, since they are intended for coulomb counting, their bandwidth is limited to a few tens of Hz, making them unsuitable for battery impedance or motor-current sensing. This paper presents a current sensor with a wide (10kHz) bandwidth and a tunable temperature compensation scheme (TCS), which allows it to be flexibly used with different types of shunts while maintaining high accuracy. A low-cost room-temperature calibration scheme is proposed to optimize gain flatness over temperature by exploiting the shunt's self-heating at large currents. Over the industrial temperature range and a ±25A current range, it achieves state-of-the-art gain error (±0.25%) with both low-cost PCB and stable metal-alloy shunts.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic InstrumentationMicroelectronic
An Article About Albertus C. Van Raalte, Author Unknown, Except for Parts Taken from an Article by Anna C. Post
No full textAn article about Albertus C. Van Raalte, author unknown, except for parts taken from an article by Anna C. Post. The author knew first generation persons in the Holland settlement and therefore, the article has some value.https://digitalcommons.hope.edu/vrp_1890s/1012/thumbnail.jp
Archivist, Archaeologist, Author and the Tactile Window
No full textThe idea that the predominant way of engaging with architecture is through vision is not uncommon but also not always the most appropriate given that buildings are also experienced through tactile interventions. This consequence that emphasises visual aesthetics in order to appreciate and understand architecture probably has much to do with the assumed but rather vaguely defined role of the architect as designer in the practice of architectural design. A resulting misapprehension is that architects designing for visual appreciation think that they are actually designing physical space for embodied tactile engagement.
This prioritisation of vision in the way architects think about and approach design is questioned through the design project of the Tactile Window in which the position of the architect is redefined through inhabiting the roles of archivist, archaeologist and author during the design process.
A 16th century portrait of Queen Elizabeth I known as the Ditchley portrait, currently on display at the National Portrait Gallery is used as the source from which the design of the Tactile Window is derived from and refers back to. Questioning the validity of vision as the sole means of engaging with the work, information about the portrait and working methods gathered from the three carefully chosen positions mentioned above are drawn on and applied to the making of this Tactile Window that becomes an alternative Ditchley portrait. Through exploring the hidden historical and current narratives of and in the existing portrait, the presence of the portrait is alluded to on an alternative physical site. Key to this are the working methods of an invented archival system of design reasoning, the unearthing of archaeological texts and assuming of authorship within the individual frameworks of the roles of archivist, archaeologist and author.
The redefined role of the architect as archaeologist takes onboard the unearthing of associated drawings and writings as well as the methods of organising and applying the recovered information to the system set up by the archivist. This analysis of the graphic and text based information is used to formulate historical narratives that are woven into the design project. Whereas traditional archaeology stresses on the study of a site from a site with quantifiable limits to the physical context, the notion of archaeological sites in this instance refers to the places where the stored information is unearthed. Through the careful process of archiving and analysing this information, a new site that is located within both the physical and historical contexts of interest is discovered. The author then draws upon the elements in the archival system that includes the findings of the archaeologist to construct the alternative Ditchley portrait in this new site of the Echoing Cedar, the result of which bears no visual resemblance to the existing work.
The Tactile Window is a reading of the Ditchley portrait in which information about and in the painting is transformed into a design proposal for an inhabited structure. The intended method of interaction with this alternative portrait is not merely restricted to vision but relies on engagement with the other senses. This experience is enhanced by the interplay with certain site conditions such as wind and rain in order to allude to specific aspects of the Ditchley portrait that are not visually apparent in the existing work.
In the processes of excavating, finding and revealing the hidden information to create this alternative portrait, the effects of the visuals afforded by the existing portrait inadvertently begin to fade as the validity of a single means of visual expression is questioned
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