1,721,015 research outputs found
Problematica
Full text linkThe taxonomy of Oligocene planktonic foraminifera
of uncertain affinity are discussed and reviewed
in this chapter. The following taxa are considered
Problematica: Acarinina inaequiconica Subbotina, Globigerina brevis Jenkins, Globigerina? grata
Todd, Globigerina khadumica Bykova, Globigerina
postcretacea Myatliuk, Globigerina pseudoedita Subbotina, Globigerina spirata Bornemann, Globigerina
stainforthi Hofker, Globigerinella evoluta Subbotina,
Globigerinella liverovskae Bykova, Globigerinella praemicra Subbotina, Globigerinella subangulata Ivanova, Globigerinoides inusitatus Jenkins, Globorotalia
denseconnexa Subbotina, Globorotalia hexacamerata
Subbotina, Globorotalia tetracamerata Subbotina,
Guembelina plana Ivanova, Guembelina pseudostriata
Ivanova, Subbotina droogeri Myatliuk, Subbotina
vialovi Myatliuk, Turborotalia bannerblowi Blaicher,
and Turborotalia czeczvaensis Myatliuk. Our understanding of each of these taxa, along with many new
SEMs of the holotypes, are presented
Taxonomy, biostratigraphy, and phylogeny of Oligocene Acarinina
Full text linkThe taxonomy, phylogeny and biostratigraphic
ranges of three Oligocene species of Acarinina are
discussed together with their synonymies. Acarinina
diversified in the Paleocene and Eocene and only a few species remain in the Oligocene. The following
taxa are recognized as valid species: Acarinina
collactea (Finlay), Acarinina echinata (Bolli),
and Acarinina medizzai (Toumarkine and Bolli)
Taxonomy, biostratigraphy, and phylogeny of Oligocene and lower Miocene Globoturborotalita
Full text linkThe taxonomy, phylogeny and biostratigraphy of
Oligocene and lower Miocene Globoturborotalita is
reviewed. Globoturborotalita is a long-ranging genus appearing in the basal Eocene and still present
in modern oceans with one living representative G.
rubescens. Species attributed to this genus are generally common and cosmopolitan. The following
species are recognized as valid: Globoturborotalita
barbula Pearson and Wade, Globoturborotalita bassriverensis Olsson and Hemleben, Globoturborotalita brazieri (Jenkins), Globoturborotalita cancellata
(Pessagno), Globoturborotalita connecta (Jenkins), Globoturborotalita eolabiacrassata Spezzaferri and
Coxall n. sp., Globoturborotalita euapertura (Jenkins), Globoturborotalita gnaucki (Blow and Banner), Globoturborotalita labiacrassata (Jenkins),
Globoturborotalita martini (Blow and Banner),
Globoturborotalita occlusa (Blow and Banner), Globoturborotalita ouachitaensis (Howe and Wallace),
Globoturborotalita paracancellata Olsson and Hemleben n. sp., Globoturborotalita pseudopraebulloides
Olsson and Hemleben n. sp., and Globoturborotalita
woodi (Jenkins)
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Taxonomy, biostratigraphy, and phylogeny of Oligocene and lower Miocene Dentoglobigerina and Globoquadrina
Full text linkThe taxonomy, phylogeny, and biostratigraphy of
Oligocene and lower Miocene Dentoglobigerina
and Globoquadrina are reviewed. Because of the
discovery of spine holes in various species assigned
to these genera, the entire group is now considered to
have been fully or sparsely spinose in life and hence
part of Family Globigerinidae. One new species,
Dentoglobigerina eotripartita Pearson, Wade, and
Olsson n. sp., is named. Dentoglobigerina includes
forms with and without umbilical teeth and species
for which the presence or absence of a tooth is a
variable feature. A significant finding has been the
triple synonymy of Globigerina tripartita Koch,
Globigerina rohri Bolli, and Globoquadrina dehiscens
praedehiscens Blow, which greatly simplifies part of
the taxonomy. The genus Globoquadrina is restricted
to its type species, Globigerina dehiscens Chapman and
others. The following species from the time interval
of interest are regarded as valid: Dentoglobigerina altispira (Cushman and Jarvis), Dentoglobigerina
baroemoenensis (LeRoy), Dentoglobigerina
binaiensis (Koch), Dentoglobigerina eotripartita
Pearson, Wade, and Olsson n. sp., Dentoglobigerina
galavisi (Bermúdez), Dentoglobigerina
globosa (Bolli), Dentoglobigerina globularis
(Bermúdez), Dentoglobigerina juxtabinaiensis
Fox and Wade, Dentoglobigerina larmeui (Akers),
Dentoglobigerina prasaepis (Blow), Dentoglobigerina
pseudovenezuelana (Blow and Banner),
Dentoglobigerina sellii (Borsetti), Dentoglobigerina
taci Pearson and Wade, Dentoglobigerina tapuriensis
(Blow and Banner), Dentoglobigerina tripartita
(Koch), Dentoglobigerina venezuelana (Hedberg),
and Globoquadrina dehiscens (Chapman, Parr,
and Collins). The genus Dentoglobigerina also
comprises other Neogene/Quaternary species not
listed, including the living species Dentoglobigerina
cf. conglomerata (Schwager)
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe 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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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
- …
