118,412 research outputs found
Silhouettanus alboclavatus Emsley 1969
No full textSilhouettanus alboclavatus Emsley 1969 (Fig. 1, dimensions in Table 1) Gen.? alboclavatus Distant, 1913: 171. Unavailable name (ICZN Art. 11.9.3) Silhouettanus alboclavatus Emsley, 1969: 88. Newly proposed generic combination for “Gen.? alboclavatus ” Distant, 1913. Holotype (male): Seychelles, Silhouette Is., Mare aux Cochons (BMNH). Type material examined. Paratype. ‘Near Mont Pot-á-eau/ 1500 ft. / Silhouette/ Seychelles Isl. / Percy Sladen Trust / expn 1908 –09 // mounted in pva / from dried specimen / M. G. Emsley 1962 / Paratype / male’ in CUMZ. Supplementary description. L 4 relatively short, ratio of lengths of labial segments roughly 2.5: 1.75: 1: 3.5. Fore wing 1.05mm long, with one pale band (clavus and adjoining corium pale), costal lobe wide; divergence of R+M from Sc basal; membrane not emarginate at apex of costal lobe; cell R <discal cell, divergence of M from R distal to basal cell, less than half area of cell R is distal to apex of discal cell; 1 AN joins Cu opposite tornus; vein setae medium; single row of papillae (four times larger than general tubercles of wing surface which are clearly arranged in hexagonal mosaic) along corial vein margins but not giving appearance at lower magnification (x 80) of pale circles. T 8 briefly produced and tapering on right side; left anophoric process is a heavily sclerotised, dark, broad, sinuate, acute process; right anophoric process probably a long strut embracing genital capsule laterally, possibly absent or slender and spinous (lap and rap in Fig. 1 E should be transposed); left paramere with short, bulbous base broadly tapering to short distal lobe; right paramere with bulbous base and elongate, curved distal lobe with bilobate apex; one conjunctival process bearing elongate, heavily sclerotized, dark, process with bifid apex; second conjunctival sclerite bearing short, curved spine; vesica spinous, with one loop. Notes. This species agrees with the generic description above in terms of thoracic structure including wings and legs. The metascutellum is not long unlike that of S. tinnulus.Published as part of Hill, Lionel, 2014, Revision of Silhouettanus with description of nine new species (Hemiptera: Heteroptera: Schizopteridae), pp. 353-385 in Zootaxa 3815 (3) on page 360, DOI: 10.11646/zootaxa.3815.3.3, http://zenodo.org/record/22661
Theory and simulations of homonuclear three-spin systems in rotating solids
No full textThe homonuclear dipolar coupling is the internal spin interaction that contributes the most to the line shapes in magic-angle-spinning (MAS) 1H NMR spectra of solids, and linewidths typically extend over several hundred Hertz, limiting the 1H resolution. Understanding and reducing this contribution could provide rich structural information for organic solids. Here, we use average Hamiltonian theory to study two- and three-spin systems in the fast MAS regime. Specifically, we develop analytical expressions to third order in the case of two and three inequivalent spins (I = 1⁄2). The results show that the full third-order expression of the Hamiltonian, without secular approximations or truncation to second order, is the description that agrees the best, by far, with full numerical calculations. We determine the effect on the NMR spectrum of the different Hamiltonian terms, which are shown to produce both residual shifts and splittings in the three-spin systems. Both the shifts and splittings have a fairly complex dependence on the spinning rate with the eigenstates having a polynomial ωr dependence. The effect on powder line shapes is also shown, and we find that the anisotropic residual shift does not have zero average so that the powder line shape is broadened and shifted from the isotropic position. This suggests that in 1H MAS spectra, even at the fastest MAS rates attainable today, the positions observed are not exactly the isotropic shifts
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
Square Dancing with the Stars to Enhance Dynamic Hirschman Linkages?
No full textIn this Presidential Address, the author takes the reader on a reconnaissance of his life and time as a regional scientist. He points out scenery he found scintillating along the way, hoping that some may pick up the banner and chew on a few of the ideas for a while. He suggests a revisit to Albert O. Hirschman’s notion of key sectors and more empirical analysis related to Marcus Berliant’s and Masahisa Fujita’s notion of knowledge creation and transfer.Presidential Address, San Antonio, Texas, March 29, 2014 (53rd Meetings of the Southern Regional Science Association
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
Letter from unknown writer to Jesse L. Boyce
No full textLetter to Jesse L. Boyce from unknown author (possibly Jack) about the investigation into the powder magazine located in the Grand Canyon. Some personal news is included in the letter such as the writer's marriage to the daughter of C.A. Taylor, former Supervisor of Cochise County
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
Atomic-resolution structural dynamics in crystalline proteins from NMR and molecular simulation
No full textSolid-state NMR can provide atomic-resolution information about protein motions occurring on a vast range of time scales under similar conditions to those of X-ray diffraction studies and therefore offers a highly complementary approach to characterizing the dynamic fluctuations occurring in the crystal. We compare experimentally determined dynamic parameters, spin relaxation, chemical shifts, and dipolar couplings, to values calculated from a 200 ns MD simulation of protein GB1 in its crystalline form, providing insight into the nature of structural dynamics occurring within the crystalline lattice. This simulation allows us to test the accuracy of commonly applied procedures for the interpretation of experimental solid-state relaxation data in terms of dynamic modes and time scales. We discover that the potential complexity of relaxation-active motion can lead to significant under- or overestimation of dynamic amplitudes if different components are not taken into consideration
Sarah L. Blum Author Visit - Warrior Nurse: PTSD and Healing
No full textHear Sarah L. Blum, author of Women Under Fire: Abuse in the Military, discuss her newest book, Warrior Nurse: PTSD and Healing followed by a Q&A and book signing.
Sarah L. Blum is a decorated Vietnam veteran who served as an operating room nurse during the intense fighting of 1967. In recognition of her service, she was awarded the Army Commendation Medal.
Sponsored by CWU Veterans Center and CWU Libraries.https://digitalcommons.cwu.edu/libraryevents/1252/thumbnail.jp
Lillian L. Lambert, Author, Speaker, and Entrepreneur
No full textLillian L. Lambert, Author, Speaker, and Entrepreneu
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