170,068 research outputs found
Megaselia praeacuta Schmitz 1919
No full textMegaselia praeacuta (Schmitz, 1919) Aphiochaeta praeacuta Schmitz, 1919: 115 (male). Megaselia arietina Disney in Cakar & Disney, 1991: 21 (both sexes). Disney & Campadelli, 1997: 63. This species is widely distributed in Europe, but seemingly not recorded from Switzerland before. Amale was trapped at Rochefort Chateau, 780 m(CH, NE), Malaise lumineuse, 14–16 July 1982, C. Dufour (CUMZ, 19-176).Published as part of R. Henry L. Disney & Sabine Prescher, 2015, Three new species of Megaselia Rondani, 1856 (Diptera, Phoridae) from Switzerland, pp. 295-306 in Mitteilungen der Schweizerischen Entomologischen Gesellschaft 88 on page 301, DOI: 10.5281/zenodo.3399
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
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
High-pressure structural studies of eskolaite by means of single-crystal X-ray diffraction
No full textThe structural behavior of Cr2O3 was investigated up to ~70 GPa using single-crystal X-ray diffraction under a quasi-hydrostatic pressure (neon pressure medium) at room temperature. The crystal structure remains rhombohedral with the space group R3̄c (No. 167) and upon compression the oxygen atoms approach an ideal hexagonal close-packing arrangement. An isothermal bulk modulus of Cr2O3 and its pressure derivative were found to be 245(4) GPa and 3.6(2), respectively, based on a third-order Birch-Murnaghan equation of state and V0 = 288.73 A^3. An analysis of the crystal strains suggest that the non-hydrostatic stresses can be considered as negligible even at the highest pressure reached
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
Johannes KENTMANN magyarországi ásványai 1565-ben = Johannes KENTMANN's minerals from Hungary in 1565
No full textArchival and printed documents (letters, diaries, books, maps, etc.) are the usual sources of research in the history of science. Non-written sources (collections, models, instruments) and their catalogues might have significant role in revealing contemporary scientific thinking. Johannes KENTMANN (1518–1574) was the first to publish a catalogue of a mineral collection: Nomenclatura rerum fossilium (Zürich, 1565). His minerals from the Carpathian region, collected during his trip to Hungary in 1550, are discussed here. Although the minerals did not persist, the catalogue faithfully recorded their characters, localities, and their classification.
KENTMANN was a medical doctor, who studied in Padova, and was a friend of Conrad GESNER. KENTMANN developed wide interests in botany and zoology while in Italy, and assembled a mineral collection during his later career. Requested to join the embassy of Josef STRAMBURGER to Hungary, sent by the elector Maurice of Saxony, in 1550 he paid a visit to the Hungarian mining centres and
collected minerals there. There were 1608 mineral specimens derived from 135 localities, about three-fourths of them from Saxony. Thirty specimens came from the Carpathian region. What can we understand from this seemingly minor, but theoretically significant collection? We suggest that KENTMANN went himself to the field and collected – at least some of – the minerals by his own hands, as indicated by Nos. 17–19 (see Table 1), found at the same locality.
He had a plan to assemble certain minerals in his collection. This plan is based mostly on those Carpathian minerals which have been discussed in AGRICOLA's De natura fossilium (1546): salt, bitumen, vitriol, copper, Bleiglanz, chrysocolla, and quicksilver. KENTMANN supplemented them by gold, bolus, enosteos (possibly fossil bones), antimon, and Bergblau. All these minerals had useful
purposes, either for metallurgy, or for medicine. He collected no minerals just for their beauty or decorative character, therefore pyrites and quartz are missing from the collection.
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Johannes KENTMANN (1518–1574) szászországi orvos 1550-ben részt vett a Josef STRAMBURGER vezette magyarországi követjáráson. Az útja során általa gyûjtött, ill. más úton megszerzett ásványok leírása megtalálható a „Nomenclatura rerum fossilium” címû, 1565-ben Zürichben megjelent
munkájában, mely a világ elsõ, nyomtatásban megjelent ásványkatalógusa. A 11 magyarországi, ill. összesen 30 kárpáti ásvány ismertetése a régió addigi legteljesebb ásványkatalógusa. KENTMANN gyûjtése a (kohászati vagy orvosi célra) hasznosítható ásványi nyersanyagokra szorítkozott
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
Structurally hidden magnetic transitions in Fe3C at high pressures
No full textWe report a Mossbauer spectroscopic study of cementite (Fe3C) in a diamond anvil cell up to 88 GPa. The hyperfine parameters reveal a two-stage loss of magnetism in Fe3C: a ferro-to-paramagnetic transition around 8-10 GPa and a spin transition at about 22 GPa. Full structural refinement based on single-crystal x-ray diffraction data collected at pressures up to similar to 50 GPa reveals that there are no structural changes associated with the electronic transitions in Fe3C. Our Rapid Communication resolves the long-standing controversy regarding the nature of phase transitions in Fe3C at high pressures
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
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