125,609 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
Review of the parasitoid wasp genus \u3cem\u3eCratichneumon\u3c/em\u3e Thomson (Hymenoptera: Ichneumonidae) from Arizona\u27s Sky Islands, with descriptions of eleven new species
No full textWe review the parasitoid wasp genus Cratichneumon Thomson (Hymenoptera: Ichneumonidae: Ichneumoninae) from the Madrean Archipelago of southeastern Arizona and describe 11 new species: C. antichromus Claridge & Helcoski sp. nov., C. arussatus Claridge & Helcoski sp. nov., C. elongatus Claridge & Helcoski sp. nov., C. fossorius Claridge & Helcoski sp. nov., C. igniferus Claridge & Helcoski sp. nov., C. luteus Claridge & Helcoski sp. nov., C. permagnus Claridge & Helcoski sp. nov., C. scabriculus Claridge & Helcoski sp. nov., C. symmixtus Claridge & Helcoski sp. nov., C. tetragonops Claridge & Helcoski sp. nov., and C. warneri Claridge & Helcoski sp. nov. Cratichneumon russatus (Cresson, 1877) syn. nov. is proposed as a junior synonym of C. astutus (Holmgren, 1868). New distribution records are presented for C. arizonensis (Viereck, 1905), C. astutus (Holmgren, 1868), and C. flaschkai Heinrich, 1973, extending their range far into the Sierra Madre Occidental in Mexico. Despite the present advances, there are still significant unresolved questions. For instance, the females of 3 species remain unidentified, no biological information is known for any of the species, and our knowledge of the distribution of all species is undoubtedly highly fragmentary. The discovery of so many unknown Cratichneumon species in Arizona highlights the paucity of our knowledge of Ichneumoninae in western North America.Aquí revisamos el género Cratichneumon Thomson (Hymenoptera: Ichneumonidae: Ichneumoninae) del archipiélago Madrense del sureste de Arizona y describen once nuevas especies: C. antichromus Claridge & Helcoski sp. nov., C. arussatus Claridge & Helcoski sp. nov., C. elongatus Claridge & Helcoski sp. nov., C. fossorius Claridge & Helcoski sp. nov., C. igniferus Claridge & Helcoski sp. nov., C. luteus Claridge & Helcoski sp. nov., C. permagnus Claridge & Helcoski sp. nov., C. scabriculus Claridge & Helcoski sp. nov., C. symmixtus Claridge & Helcoski sp. nov., C. tetragonops Claridge & Helcoski sp. nov., y C. warneri Claridge & Helcoski sp. nov. También, C. russatus (Cresson, 1877) se propone como sinónimo junior de C. astutus (Holmgren, 1868). Se presentan nuevos registros de distribución para C. arizonensis (Viereck, 1905), C. astutus (Holmgren, 1868), y C. flaschkai Heinrich, 1973, extendiendo su área de distribución hasta la Sierra Madre Occidental en México. A pesar de los avances actuales, todavía existen importantes preguntas sin resolver. Por ejemplo, las hembras de tres especies siguen sin identificar, no se conoce información biológica de ninguna de las especies y nuestro conocimiento sobre la distribución de todas las espécies es sin duda sumamente fragmentario. El descubrimiento de tantos de especies desconocido de Cratichneumon en Arizona destaca la escasez de nuestro conocimiento de Ichneumoninae en el oeste de América del Norte
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
FIGURE 2 in Revision of the genus Jethsura Cameron, 1902 (Hymenoptera: Ichneumonidae: Ichneumoninae: Phaeogenini)
No full textFIGURE 2. Jethsura euthenia sp. nov. male paratype. A. Habitus. B. Head, frontal view. C. Mandible, ventral view. Scale bars: 5.0 mm (A); 1.0 mm (B–C).Published as part of Claridge, Brandon, 2021, Revision of the genus Jethsura Cameron, 1902 (Hymenoptera: Ichneumonidae: Ichneumoninae: Phaeogenini), pp. 223-241 in Zootaxa 5071 (2) on page 227, DOI: 10.11646/zootaxa.5071.2.3, http://zenodo.org/record/572356
Still counting: new records, nomenclatural notes, and three new species of Phaeogenini (Hymenoptera, Ichneumonidae, Ichneumoninae) from the Afrotropical region
No full textA synthesis of the Phaeogenini occurring in the Afrotropical region is provided. Three species are newly described: Centeterichneumon nambi Dal Pos, Diller & Di Giovanni sp. nov. from Uganda, Chauvinia ganota Claridge sp. nov. from Kenya, and Kibalus nonnaritae Dal Pos & Di Giovanni sp. nov. from Uganda. Heterischnus mfongosi Rousse & van Noort, 2013 is newly recorded for Kenya and Tanzania and the male of the species is diagnosed for the first time. Also, the female of Arearia oxymoron Rousse & van Noort, 2013 is diagnosed for the first time from one of the paratype localities. Lusius tenuissimus (Heinrich, 1938) and Chauvinia nyanga Rousse & van Noort, 2013 are recorded for the first time for Uganda and Kenya, respectively. In addition, new localities are given for Chauvinia nitida (Heinrich, 1938), Heterischnus olsoufieffi (Heinrich, 1938) and Hoplophaeogenes curticornis Heinrich, 1938. A new combination, Nesostenodontus mkomazi (Rousse & van Noort, 2013) comb. nov., is proposed to accommodate Heterischnus mkomazi. An updated key to the Afrotropical genera of Phaeogenini and keys to the Afrotropical species of the genera Arearia Seyrig, Centeterichneumon Heinrich, Chauvinia Heinrich, Heterischnus Heinrich, Hoplophaeogenes Heinrich, Kibalus Rousse, van Noort & Diller, and Lusius Tosquinet are provided. Updated online Lucid keys to genera and species are available from http://www.waspweb.org
Population ecology of Blainville's beaked whales (Mesoplodon densirostris)
No full textQuantifying population demographics is necessary to analyse the status of
wildlife populations and to support effective conservation and management. Such a
need exists for beaked whales which are vulnerable to anthropogenic noise, including
navy sonar. Here, population demographics were estimated for Blainville’s beaked
whales (Mesoplodon densirostris) in The Bahamas and the potential population-level
effects of sonar investigated. Mark-recapture models were fitted to photo-identification
data collected at the US Navy’s Atlantic Test and Evaluation Centre (AUTEC) where
sonars were used regularly and 170 km away at Abaco where sonar use was limited,
with the exception of a navy exercise correlated with a stranding of beaked whales in
2000.
Life history data collected from 1997-2011 revealed that onset of sexual
maturity occurred at age nine for both males and females and minimum longevities
were 23 years. The annual turnover of individuals at Abaco was supported by the
estimation of a larger parent population. However, adult females showed high site
fidelity and survival, while adult males’ occupancy patterns were different, making
survival of males difficult to separate from permanent emigration. Average annual
abundance was lower at AUTEC when compared to a same-sized area at Abaco.
Despite a similar number of adult females at both sites, a higher female:calf ratio was
found at AUTEC, suggesting lower recruitment through births may have contributed to
lower abundance. Population demographics in Abaco changed after the 2000 stranding;
abundance and temporary emigration increased then returned to pre-2000 levels remaining stable thereafter. Two stranded whales re-floated in 2000 were later re-sighted having survived exposure to sonar and the physiological stresses related to stranding. This work provides evidence of a possible population-level effect of sonar use at a navy range and during a multi-ship exercise, emphasising the valuable role that longitudinal studies play in monitoring impacts of anthropogenic activities
Tissue Culture Conference -- 1952 -- Conferences and Special Meetings, NFIP -- letter, 1952-03-19
No full textLetter from Sabin, Albert B. to The Claridge Hotel dated 1952-03-19.Sabin Collection Fair Use Policy</a
Figure 11 from: Claridge B (2021) Revision of Nearctic Heterischnus Wesmael, 1859 (Hymenoptera, Ichneumonidae, Ichneumoninae, Phaeogenini). Journal of Hymenoptera Research 85: 57-79. https://doi.org/10.3897/jhr.85.67792
No full textFigure 11 Heterischnus mexicanus sp. nov., paratype male (Mexico: Saltillo) A habitus B head, frontal view. Scale bars: 5.0 mm (A); 1.0 mm (B)
Nanometric oxides for functional materials
No full textThis thesis describes the synthesis and application of complex metal oxide nanoparticles. The work is focussed on three core areas; the synthesis of CoFe2O4 nanoparticles and their application as CO oxidation catalysts, the controlled assembly of functionalised CoFe2O4 and BaTiO3 nanoparticles and the preparation and characterisation of magnetoelectric composites from chemically-bonded nanoparticle assemblies.
Chapter 1 gives an introduction to the history of nanotechnology, recent
developments in the synthesis of nanoparticles and other areas key to the work
described herein.
In Chapter 2 details the synthetic and analytical techniques employed.
Chapter 3 describes the synthesis and characterisation of CoFe2O4 nanoparticles, and
their application as catalysts in the CO oxidation reaction. Nanoparticles were
prepared with a range of controlled sizes and were found to be active CO oxidation
catalysts. Analysis of their size-dependent activity and stability is performed.
Chapter 4 describes the assembly of CoFe2O4 and BaTiO3 nanoparticles by direct
functionalisation of the nanoparticle surfaces using complementary organic
functional molecules. Characterisation of the functionalised nanoparticles and
assemblies is performed, and the extensibility of the developed functionalisation and
assembly protocol is tested using particles with different sizes and morphologies.
In Chapter 5 the assembled nanoparticles discussed in Chapter 4 are processed into
dense ceramics with a view to preparing magnetoelectric composites. The
magnetoelectric properties are tested, and optimisation of the ceramics is performed
by modification of the starting nanoparticle sizes, composite composition and
processing conditions. The composites are tested against control samples prepared by
traditional grinding and firing, and characterisation of the ceramics using XRD and
electron microscopy provides and insight as to why their magnetoelectric properties
differ to those prepared by the traditional technique.
The work contained in this thesis has been published in the following papers: -
G. Evans, I. V. Kozhevnikov, E. F. Kozhevnikova, J. B. Claridge, R. Vaidhyanathan,
C. Dickinson, C. D. Wood, A. I. Cooper, M. J. Rosseinsky, “Particle-size Activity
Relationship for CoFe2O4 Nanoparticle CO Oxidation Catalysts,” J. Mater. Chem.
2008, 18, 5518.
G. Evans, G. V. Duong, M. J. Ingleson, Z. Xu, J. T. A. Jones, Y. Z. Khimyak, J. B.
Claridge, M. J. Rosseinsky, “Chemical Bonding Assembly of Multifunctional Oxide
Nanocomposites,” Adv. Funct. Mater. 2010, 20, 231
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