171,065 research outputs found
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
Are postnatal hemangioblasts generated by dedifferentiation from committed hematopoietic stem cells?
No full textCell dedifferentiation occurs in different cell systems. In spite of a relative paucity of data it seems reasonable to assume that cell dedifferentiation exists in reversible equilibrium with differentiation, to which cells resort in response to intercellular signals. The current literature is indeed compatible with the concept that dedifferentiation is guided by structural rearrangements of nuclear chromatin, directed by epigenetic cell memory information available as silenced genes stored on heterochromatin, and that gene transcription exists in reversible "fluctuating continua" during parental cell cycles. Here, we review the molecular mechanisms of cell dedifferentiation and suggest for hematopoietic development that postnatal hemangioblasts are generated by dedifferentiation of committed hematopoietic stem cells. (c) 2007 International Society for Experimental Hematology. Published by Elsevier Inc
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
NROMTM - A new non-volatile memory technology: From device to products
No full textNROMTM — a new NVM technology has recently been introduced, enabling three major improvements relative to the floating gate technology: one technology for all NVM products (Flash, EEPROM, ROM and Embedded), higher density (2.5F2 per bit in flash) and simple process with reduced number of masks without any exotic materials. The NROMTM cell is based on localized charge trapping above the junction edge, enabling physically separated two bits per cell. Performance of new NVM NROMTM based products show endurance up to 100 K with retention of 10 years at 150°C
NROM (TM) - a new technology for non-volatile memory products
No full textNROM(TM)-is a new technology for non-volatile memories (NVMs); it offers three major improvements relative to the Floating Gate technology: one technology for all NVM products (Flash, EEPROM, ROM and Embedded), higher density (2.5F(2)/bit in Flash, where F is the feature size of the process), and simpler process with reduced number of masks without any exotic materials. The NROM(TM) cell is based on localized charge trapping above the junction edge, storing two physically separated bits per cell. Performance of new NVM NROM(TM) based products show endurance up to 100 K with retention of 10 years at 150 degreesC. (C) 2002 Elsevier Science Ltd. All rights reserved
Figure 17 in The Tenuipalpidae (Acari: Trombidiformes) of Israel
No full textFigure 17 Cenopalpus spinosus(Donnadieu) – Female: A – dorsal view; B – opisthogaster; Deutonymph: C – dorsal view.Published as part of Ueckermann, Edward A., Palevsky, Eric, Gerson, Uri, Recht, Eitan & Theron, Pieter D., 2018, The Tenuipalpidae (Acari: Trombidiformes) of Israel, pp. 483-525 in Acarologia 58 (2) on page 507, DOI: 10.24349/acarologia/20184255, http://zenodo.org/record/539953
Figure 2 in The Tenuipalpidae (Acari: Trombidiformes) of Israel
No full textFigure 2 Aegyptobia eremiaSmith Meyer & Gerson – Female: A – dorsal view; B – dorsal setac1; C – opisthogaster.Published as part of Ueckermann, Edward A., Palevsky, Eric, Gerson, Uri, Recht, Eitan & Theron, Pieter D., 2018, The Tenuipalpidae (Acari: Trombidiformes) of Israel, pp. 483-525 in Acarologia 58 (2) on page 486, DOI: 10.24349/acarologia/20184255, http://zenodo.org/record/539953
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
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