170,384 research outputs found
Author and Narrator in Lyric Poetry
No full textHillebrandt C. Author and Narrator in Lyric Poetry. In: Birke D, Köppe T, eds. Author and Narrator. Transdisciplinary contributions to a narratological debate . Linguae & litterae. Vol 48. Berlin: De Gruyter; 2015: 213-233
Ueber die höchste Benutzung der Birke : Ein Nachtrag zu der von Herrn C. P. Laurop herausgegebenen Schrift über den Anbau der Birke / von C. Adolph Freyherrn v. Seckendorff
No full textUEBER DIE HÖCHSTE BENUTZUNG DER BIRKE : EIN NACHTRAG ZU DER VON HERRN C. P. LAUROP HERAUSGEGEBENEN SCHRIFT ÜBER DEN ANBAU DER BIRKE / VON C. ADOLPH FREYHERRN V. SECKENDORFF
Ueber die höchste Benutzung der Birke : Ein Nachtrag zu der von Herrn C. P. Laurop herausgegebenen Schrift über den Anbau der Birke / von C. Adolph Freyherrn v. Seckendorff (1)
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A Well-Balanced Semi-implicit IMEX Finite Volume Scheme for Ideal Magnetohydrodynamics at All Mach Numbers
No full textWe propose a second-order accurate semi-implicit and well-balanced finite volume scheme for the equations of ideal magnetohydrodynamics including gravitational source terms. The scheme treats all terms associated with the acoustic pressure implicitly while keeping the remaining terms part of the explicit sub-system. This semi-implicit approach makes the method particularly well suited for problems in the low Mach regime. We combine the semi-implicit scheme with the deviation well-balancing technique and prove that it maintains equilibrium solutions for the magnetohydrostatic case up to rounding errors. In order to preserve the divergence-free property of the magnetic field enforced by the solenoidal constraint, we incorporate a constrained transport method in the semi-implicit framework. Second order of accuracy is achieved by means of a standard spatial reconstruction technique with total variation diminishing property, and by an asymptotic preserving time stepping algorithm built upon the implicit-explicit Runge–Kutta time integrators. Numerical tests in the low Mach regime and near magnetohydrostatic equilibria support the low Mach and well-balanced properties of the numerical method
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
Natural radioactive elements U, Th and K in European soil.
No full textThis paper describes and discusses data on baseline levels the concentration of U, Th and K in agricultural and grazing land soils across Europe. In total, 2218 samples of agricultural soil and 2127 samples of grazing land soil were collected with an average sampling density of 1 site per 2500 km2 (a grid of 50 x 50 km) over an area of 5.6 million km2 across Europe. The uranium concentrations over the survey area vary from <0.1 to 23.55 mg/kg in agricultural soil and from <0.1 to 73.32 mg/kg in grazing land soil, with a median value of 0.77 and 0.74, respectively. The median Th content is 2.89 mg/kg in agricultural soil and 2.5 mg/kg in grazing land soil; the range varies from <0.1 to 63.1 mg/kg in agricultural soil and <0.1 to 55.64 mg/kg in grazing land soil. The median potassium content is 16 000 mg/kg in agricultural soil and 14 900 mg/kg in grazing land soil, with a range between 241 mg/kg and 79,200 mg/kg in agricultural soil and between 241 mg/kg and 50000 mg/kg in grazing land soil. The new data define the soil geochemical U, Th and K baseline background for European agricultural and grazing land soil, providing information of crucial importance to increase our knowledge about ’soil quality’ at the European scale. Such data are essential for agriculture, animal and human health, setting of environmental standards, water quality, land use planning and the identification of mineral resource potential
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
Hose rate control for P2P-TV streaming systems
No full textIn this paper we consider mesh based P2P streaming systems focusing on the problem of regulating peer upload rate to match the system demand while not overloading each peer upload link capacity. We propose Hose Rate Control (HRC), a novel scheme to control the speed at which peers offer chunks to other peers, ultimately controlling peer uplink capacity utilization. This is of critical importance for heterogeneous scenarios like the one faced in the Internet, where peer upload capacity is unknown and varies widely. HRC nicely adapts to the actual peer available upload bandwidth and system demand, so that users' Quality of Experience is greatly enhanced. Both simulations and actual experiments involving up to 1000 peers are presented to assess performance in real scenarios. Results show that HRC consistently outperforms the Quality of Experience achieved by non-adaptive schemes
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