177,540 research outputs found
A Langevin simulation of the Gross-Neveu spectrum
No full textLacaze R, Morel A, Petersson B. A Langevin simulation of the Gross-Neveu spectrum. Nucl.Phys.Proc.Suppl. 1990;17:736-739
THE LATTICE GROSS-NEVEU MODEL AND THE LANGEVIN ALGORITHM
No full textAttig N, Lacaze R, Morel A, Petersson B, Wolff M. THE LATTICE GROSS-NEVEU MODEL AND THE LANGEVIN ALGORITHM. 1987
Rolandia coralloides Lacaze-Duthiers 1900
No full textRolandia coralloides Lacaze-Duthiers, 1900 (Figure 19) To check an extensive synonymous list, see Ocaña et al. 2000. Material examined ESFM-CNI/2012-04; 2 October 2012, Sea of Marmara, K18, 40°50 ʹ 26 ʺ N, 29°07 ʹ 33 ʺ E, 25 m, growing on rocky substrate, portion of a colony. Remarks Sclerites of the specimens include crosses, fused quadruplets, shuttles and six radiates. The colony portion shows a ribbon-like stolon morphology (Figure 19 (a), 19(b)) (see Ocaña et al. 2000). Misinterpretations about the taxonomy of Evagora rosea Philippi 1842, Sarcodictyon catenatum Forbes 1847 and Rolandia coralloides de Lacaze Duthiers 1900 have been repeated until recent times, as Weinberg (1978) and Manuel (1981) considered E. rosea and R. coralloides as synonymous species. They also synonymized S. catenatum and R. rosea with Sarcodictyon roseum. Çinar et al. (2014) also included S. roseum into the checklist of Cnidaria and Ctenophora from Turkey based on the report by Ostroumoff (1894). Evagora rosea was originally described from the Mediterranean and possibly belongs to Sarcodictyon or Rolandia, but this remains uncertain due to the inaccurate description by Philippi (1842); it is even possible that it belongs to Scleranthelia Studer, 1878. In fact, after Philippi, species with some resemblance to E. rosea were generally referred to this species. The paper by Ocaña et al. (2000) proved that R. coralloides and S. catenatum are distinct species, while the validity of E. rosea and S. roseum has not been solved yet. Habitat This species was found on a stone in 25 m depth.Published as part of Ocaña, Oscar & Çinar, Melih Ertan, 2018, Descriptions of two new genera, six new species and three new records of Anthozoa (Cnidaria) from the Sea of Marmara, pp. 2243-2282 in Journal of Natural History 52 (35 - 36) on pages 2273-2275, DOI: 10.1080/00222933.2018.1526345, http://zenodo.org/record/474734
Harmonization of GEOV2 fAPAR time series through MODIS data for global drought monitoring
No full textThe temporal consistency of the fAPAR GEOV2 full time series (constituted by data derived from SPOT-VGT1/2 and PROBA-V) is analyzed against the single-sensor MODIS dataset, with a particular focus on the most recent fAPAR anomalies (z-scores) produced from PROBA-V in the period 2014–2017. The intercomparison highlights a systematic overestimation of GEOV2 fAPAR z-scores when compared to MODIS fAPAR, likely related to the observed positive bias (over 90% of the domain) in the PROBA-V vs. SPOT-VGT1/2 relationship. A simple two-step harmonization procedure has been proposed to remove this discrepancy, based on two separate linear corrections of SPOT-VGT1/2 (2001–2013) and PROBA-V (2014–2017) data with respect to MODIS, followed by a time lag correction. The harmonized GEOV2 time series preserves the overall dynamic of fAPAR, while removing the sensor bias and improving the consistency with MODIS data. The fAPAR anomalies from the harmonized GEOV2 time series provide unbiased estimates of z-scores that are overall well correlated (R = 0.55 ± 0.25) with the MODIS fAPAR anomalies
SIMULATING THE GROSS-NEVEU MODEL WITH THE LANGEVIN ALGORITHM - A COMPARISON OF ANALYTICAL AND NUMERICAL RESULTS
No full textBELANGER L, LACAZE R, MOREL A, ATTIG N, Petersson B, WOLFF M. SIMULATING THE GROSS-NEVEU MODEL WITH THE LANGEVIN ALGORITHM - A COMPARISON OF ANALYTICAL AND NUMERICAL RESULTS. NUCLEAR PHYSICS B. 1990;340(1):245-279
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
FINITE-SIZE EFFECTS AT TEMPERATURE-DRIVEN 1ST-ORDER TRANSITIONS - COMMENT
No full textBILLOIRE A, LACAZE R, MOREL A, GUPTA S, IRBACK A, Petersson B. FINITE-SIZE EFFECTS AT TEMPERATURE-DRIVEN 1ST-ORDER TRANSITIONS - COMMENT. PHYSICAL REVIEW B. 1990;42(10):6743-6744
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
A survey of the genera Sarcodictyon Forbes, 1847, and rolandia Lacaze-Duthiers, 1900, (anthozoa: octocorallia) in the North-eastern Atlantic and the Mediterranean
No full textSarcodictyon catenatum Forbes, 1847, is a common species in the Atlantic and the Mediterranean. However, often it has been mistaken for Rolandia coralloides Lacaze-Duthiers, 1900. On the basis of British and Mediterranean material we studied the main characters for distinguishing S. catenatum. We consider Rolandia coralloides Lacaze-Duthiers, 1900, to be a valid species and we assign to it all the material named Rolandia rosea by S. Weinberg (1978). Furthermore, a histological study confirmed that R. coralloides typically forms groups of polyps embedded in a common coenenchyme. Therefore, the possibility of transferring R. coralloides from Stolonifera to Alcyonacea is discussed. Evagorgia rosea Philippi, 1842, is here considered to be a nomen dubium
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
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