130,965 research outputs found
Erläuterungen zu Franz Liszt's Faust-Symphonie : (Auszug aus seinen "Gesammelten Schriften", Leipzig, B. Schlicke.) / von Richard Pohl
No full textERLÄUTERUNGEN ZU FRANZ LISZT'S FAUST-SYMPHONIE : (AUSZUG AUS SEINEN "GESAMMELTEN SCHRIFTEN", LEIPZIG, B. SCHLICKE.) / VON RICHARD POHL
Erläuterungen zu Franz Liszt's Faust-Symphonie : (Auszug aus seinen "Gesammelten Schriften", Leipzig, B. Schlicke.) / von Richard Pohl (1)
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A novel atmospheric pressure glow discharge system for sensitive determination of As, Sb, and Se by optical emission spectrometry following their hydride generation
No full textMetadata and measurement data related to the publication entitled "A novel atmospheric pressure glow discharge system for sensitive determination of As, Sb, and Se by optical emission spectrometry following their hydride generation", which was published by K. Greda, J. Kratzer, N. Vlckova and P. Pohl in Spectrochimica Acta Part B, 2024, volume 213, number 106879</p
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
Luehea microphylla Pohl 1833
No full text<p> <i>Luehea microphylla</i> Pohl (1833: 129).</p> <p> Type:— BRAZIL. Minas Gerais: Minas Novas, “Habitat inter arbores ad margines fluviorum ad Rio S.Francisco, Capitanae Minas Novas. Legi florentem mense Octobri 1819”, <i>Pohl s.n.</i> (lectotype [as ‘holotype’], first-step designated by Cunha (1985: 10); <b>second-step lectotype, designated here</b>, W! [W0071087]). Minas Gerais: Minas Novas, <i>Pohl s.n.</i> (syntype remaining W! [W0071386]). [= <i>Luehea candicans</i> Mart.]</p> <p> Pohl’s original collection is kept in W where he worked and lived (Stafleu & Cowan 1976 –1988: 315), and where we found only two specimens reported by the author to the name <i>L. microphylla</i> and collected by him in Brazil (B. Wallnöfer, pers. comm.). These two specimens are syntypes of <i>L. microphylla</i>, and the previous typification of Cunha (1985) needs to be corrected (Art. 9.2 of the ICN), since it represents the first-step lectotype of <i>L. microphylla</i> and now requires the second-step typification by the way of subsequent lectotypification (Art. 9.17 of the ICN). For this reason, we designated herein the specimen <i>Pohl s.n.</i> (W0071087) the second-step lectotype of <i>L. microphylla</i>, that agree well with the morphological description presented in the protologue. Based on the type materials, the application of the name <i>L. microphylla</i> Pohl is confirmed as a heterotypic synonym of <i>L. candicans,</i> as previously accepted by Cunha (1985).</p>Published as part of <i>Gerace, Samuele, Bovini, Massimo G., Peruzzi, Lorenzo & Baumgratz, José Fernando A., 2022, Typification of names in the neotropical genus Luehea (Malvaceae: Grewioideae), pp. 180-188 in Phytotaxa 542 (2)</i> on pages 183-184, DOI: 10.11646/phytotaxa.542.2.5, <a href="http://zenodo.org/record/6415980">http://zenodo.org/record/6415980</a>
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
Luehea macrophylla Pohl 1833
No full text<p> <i>Luehea macrophylla</i> Pohl (1833: 127).</p> <p> Type:— BRAZIL. Goyas: Corumba, “ Habitat inter arbores ad margines fluviorum, circa Corumba, S. Luzia, Corgo di Jaragua, Capitainae Goyaz. Legi florentem mense Decembri et Januario 1819 et 1820”, <i>Pohl s.n.</i> (<b>lectotype, designated here,</b> W! [W0071385]). Goyas: Corumba, “ In silva Mattogrosso ad Corgo di Jaragua ”, <i>Pohl s.n.</i> (syntype remaining W! [W0071100]). [= <i>Luehea rufescens</i> A.St. -Hil.]</p> <p> In the protologue of <i>L. macrophylla</i> no reference is made to a specific specimen. Pohl’s original collection is kept in W where he worked and lived (Stafleu & Cowan 1976 –1988: 315). We found only two specimens of Pohl’s original collection with the name <i>L. macrophylla</i> preserved in this herbarium. Both specimens were collected by Pohl in Brazil (B. Wallnöfer, pers. comm.), and are syntypes of <i>L. macrophylla</i>. They have labels mentioning the location congruent with the protologue, and Pohl’s handwriting (B. Wallnöfer, pers. comm.), but the page and illustration numbers of the species publication are erroneous and correspond to the description and illustration of <i>L. microphylla</i>. However, these specimens are <i>L. macrophylla</i>, and agree well with the vegetative and reproductive description presented in the protologue. For this reason, in accordance with Arts. 9.3 and 9.4 of the ICN, we have designated herein the specimen <i>Pohl s.n.</i> (W0071385) as the lectotype of <i>L. macrophylla</i>, by choosing the most complete specimen. The name <i>L. macrophylla</i> has been considered a synonym of <i>L. rufescens</i> A.St. - Hil. (Schumann 1886).</p>Published as part of <i>Gerace, Samuele, Bovini, Massimo G., Peruzzi, Lorenzo & Baumgratz, José Fernando A., 2022, Typification of names in the neotropical genus Luehea (Malvaceae: Grewioideae), pp. 180-188 in Phytotaxa 542 (2)</i> on page 183, DOI: 10.11646/phytotaxa.542.2.5, <a href="http://zenodo.org/record/6415980">http://zenodo.org/record/6415980</a>
Parkinsons with Emma Ody Pohl
No full textFrom the Photograph Collection. B. L. and Dera Dry Parkinson with Emma Ody Pohl and another womanhttps://athenacommons.muw.edu/mdl-undated/1084/thumbnail.jp
Lobelia exaltata Pohl 1831
No full text<p> <b>2.</b> <i>Lobelia exaltata</i> Pohl (1831: 101)</p> <p> ≡ <i>Rapuntium exaltatum</i> (Pohl) Presl (1836: 24) ≡ <i>Haynaldia exaltata</i> (Pohl) Kanitz (1878: 141) ≡ <i>Dortmanna exaltata</i> (Pohl) Kuntze (1891: 972).</p> <p> Type:— BRAZIL. Rio de Janeiro: “ In Cap. Minas Geraes & ad Mathias Ramos Cap. Rio de Janeiro ”, s.d., <i>Pohl 5151</i> (holotype: W! [0058412]).</p> <p> = <i>Haynaldia exaltata</i> var. <i>ramosa</i> Kanitz (1878: 141).</p> <p> Type: BRAZIL. São Paulo: loco non addicto, <i>Burchell 4670</i> (holotype: K! [K001047525]).</p> <p> = <i>Lobelia stellfeldii</i> Braga (1956: 52), <b>syn. nov</b>.</p> <p> Type:— BRAZIL. Paraná: Atuba, em campo pouco além do Posto Fiscal, 6 Abril 1955, <i>Stellfeld 4998</i> (holotype: UPCB! [14369]).</p> <p> <b> <i>Notes</i>:</b> <i>— Lobelia exaltata</i> was described by Pohl (1831) based on the material collected during his expeditions in the states of Rio de Janeiro and Minas Gerais. The protologue consists of a diagnosis, locality (“Habitat in uliginosis paludosisque locis Capitaniae Rio de Janeiro ad Fazenda Mathias Ramos, et Capitaniae Minas Geraes”), and detailed description. We found a single collection <i>Pohl 5151</i> housed at W bearing a label perfectly matching the protologue. It is thus interpreted as its holotype.</p> <p> <i>Lobelia stellfeldii</i> was described based on the <i>Stellfeld 4998</i> collection from Paraná. It is morphologically closely related to <i>L</i>. <i>exaltata</i>, sharing with it the characteristic white flowers and glabrous leaves. The difference between these taxa was established mainly on the basis of geographic distribution, since the occurrence of <i>L</i>. <i>exaltata</i> in the south of Brazil was unknown at that time (Braga 1956). The specimen <i>Stellfeld 4998</i> (UPCB) has no flower parts or bracts, and is limited to leaves, fruits and seeds, all remarkably similar to those of <i>L</i>. <i>exaltata</i> specimens. The taxon does not have sufficient characteristics to be maintained as a distinct species, and thus is treated here as a synonym. In her MSc thesis Vieira (1988) synonymizes <i>L. stellfeldii</i> to <i>L. exaltata</i> but, according to Art. 29–32 of the ICN (McNeill 2014), her thesis cannot be considered an effective publication.</p>Published as part of <i>Rollim, Isis De Mello, Coelho, Guilherme Peres, Miotto, Silvia Teresinha Sfoggia, Iganci, João Ricardo Vieira & Oliveira, Marcelo Trovó Lopes De, 2022, Nomenclatural and taxonomic survey of the South American clade of Lobelia section Rhynchopetalum (Campanulaceae), pp. 45-54 in Phytotaxa 539 (1)</i> on page 49, DOI: 10.11646/phytotaxa.539.1.5, <a href="http://zenodo.org/record/6345927">http://zenodo.org/record/6345927</a>
Portable cost modeling for auto-vectorizers
No full textCompiler optimization passes employ cost models to determine if a code transformation will yield performance improvements. When this assessment is inaccurate, compilers apply transformations that are not beneficial, or refrain from applying ones that would have improved the code. We analyze the accuracy of the cost models used in LLVM's and GCC's vectorization passes for two different instruction set architectures. In general, speedup is over-estimated, resulting in mispredictions and a weak to medium correlation between predicted and actual performance gain. We therefore propose a novel cost model that is based on a code's intermediate representation with refined memory access pattern features. Using linear regression techniques, this platform independent model is fitted to an AVX2 and a NEON hardware. Results show that the fitted model significantly improves the correlation between predicted and measured speedup (AVX2: +52% for training data, +13% for validation data), as well as the number of mispredictions (NEON: -15 for training data, -12 for validation data) for more than 80 code patterns
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