4,213 research outputs found
Validating the use of unique trait combinations for measuring multivariate functional richness
No full text1. Quantifying functional trait diversity has provided important new insights for understanding ecosystem processes and functioning. Functional diversity is often partitioned into three components richness, evenness and divergence. Currently, a convex hull is used as a measure of multivariate richness, but this approach has some serious limitations. 2. Consequently, we propose using the number of unique trait combinations (UTCs) as an approach to measure the filled trait space (the hypervolume containing all possible trait combinations) and propose a new index, sUTC, as the amount of filled trait space divided by the trait space range. Like convex hull approaches, UTC can be partitioned into alpha and beta components when used across sites, and the beta component can be further partitioned into turnover and nestedness components. Unlike convex hull approaches, UTC can be used more intuitively with existing diversity measures as it can be used in conjunction with abundance information. We present the concepts these indices are based on and give examples of their use. The new index, sUTC, is compared to the existing indices on the basis of criteria specified in the literature and one novel criterion. We test and evaluate the approach using simulated data and field data. 3. We found that the UTC approach provided a more accurate assessment of functional richness than did the existing indices. 4. The UTC approach is a multivariate approach to measuring functional richness that can accommodate continuous and categorical traits and can account for holes in the trait space
SpatialDemography: a spatially explicit, stage‐structured, metacommunity model
No full text1. The responses of species and populations to changes in the environment (e.g., changes in climate and land use) are often complex and difficult to predict.2. We have created the SpatialDemography model (R package: spatialdemography). The model is a spatially explicit, stage-structured, matrix-based metacommunity model, with the potential for modeling species' and populations' potential responses to environmental heterogeneity and change.3. The SpatialDemography model assumes a cellular landscape populated by organisms with four life stages: a mobile dispersing stage, two sessile non-reproductive stages, and a reproductive adult stage. Individuals are assumed to originate at the center of a given cell and disperse according to a specified dispersal kernel (e.g., log-normal). All adult individuals are capable of producing offspring. The model approach and framework are described in the context of a hypothetical example with multiple competing species in a four cell landscape. In this example simulation, both spatial location and species interactions were important for understanding population dynamics.4. SpatialDemography can be applied to questions where an understanding of transient and long-term demographic responses to spatiotemporal changes is desired. It is primarily applicable to metapopulations and metacommunities of organisms with early dispersal and sessile adults (i.e. modular organisms such as plants and some marine organisms). SpatialDemography differs from other population models in that it is spatially explicit, can incorporate biotic interactions, and is implemented in R
Author inscription in William Hazlitt, essayist and critic; selections from his writings, with a memoir, biographical and critical by Alexander Ireland
No full textAuthor's gift inscription, "To W. C. Hazlitt Esq with kind regards, from Alexr Ireland," with tipped-in review of the book.ASU Library edition has inscription from Ireland to Hazlitt [a child of William Hazlitt?].
Hazlitt , William, 1778-1830.
Ireland, Alexander, 1810-1894
Odoardo Fialetti (1573-c.1638): the interrelation of Venetian art and anatomy, and his importance in England
No full textBolognese artist Odoardo Fialetti (1573 – c.1638) is a fascinating figure upon which curiously little work has been done. Though he is a rarely discussed pupil of Tintoretto, Fialetti’s oeuvre is vast (some 55 known paintings and approximately 450 prints) and incredibly diverse. His work encompasses religious subjects, portraits, books on drawing and sport, maps, and illustration for treatises on city defences, literary texts, and anatomy. His work was influential for several hundred years after his death, not only in Venice and northern Italy, but also in France where his designs were used as decoration on faïence produced at Nevers, and England, where his paintings were much admired at court. Fialetti’s close association with Sir Henry Wotton, and the careful copy of his drawing book made by Alexander Browne in the mid-seventeenth century, attest to his impact on the formation of an Italianate sensibility in the appreciation of the visual arts in Early Modern England. In the realm of science, Fialetti’s influence can be deduced from his drawings of curiously animated cadavers in detailed landscapes to those of future generations of anatomists and illustrators throughout Europe. Because of the diverse associations and projects throughout his career, the study of Fialetti is inherently interdisciplinary, encompassing the history of art, history of science and history of the Venetian book trade, as well as crossing geographical boundaries in linking Venetian art and English tastes of the late renaissance and early baroque. Through examination of his extant oeuvre, as well as discussion of lost work, I aim to recognise Fialetti’s status as an artist responding to contemporary artistic debates (disegno versus colorito), a changing cultural climate and the burgeoning importance of the printed medium
books piece profiling Portland author Alexander C. Irvine, and his debut scien
No full textbooks piece profiling Portland author Alexander C. Irvine, and his debut science fiction novel, A Scattering of Jades, published by Tor in 2002. Irvine has signed a deal with Del Ray to publish his next two books, and has been hired to write the next robot book for iBooks, who own the rights to extend Isaac Asimov\u27s legacy of robot future-history
Métricas de autor Alexander Cotte Poveda
No full textInforme de las métricas de autor del Dr. Alexander Cotte Poveda de las publicaciones indexadas en Google Académico cuyo objetivo es entregar un insumo para el fortalecimiento de las capacidades y potencialidades de los autores de la Universidad Santo Tomás en el posicionamiento y visibilidad de sus publicacionesReport of the author metrics Alexander Cotte Poveda of the publications indexed in Google Scholar whose objective is to provide an input for the strengthening of the capacities and potentialities of the authors of the Santo Tomás University in the positioning and visibility of their publications.http://unidadinvestigacion.usta.edu.c
Two equalities on the Alexander polynomial of the pretzel knot of type (-2,3,7)
No full textThe pretzel knot of type (-2,3,7) is very well known as a starting example of the lens surgery(i.e. hyperbolic knots yielding lens spaces by Dehn surgery), and its Alexander polynomial also hasbeen studied well in the theory of algebraic integers. In this paper, the author studies twoequalities concerning the Alexander polynomials of this knot and he also explains his recentresearch concerning this knot.departmental bulletin pape
Two equalities on the Alexander polynomial of the pretzel knot of type (-2,3,7)
No full textThe pretzel knot of type (-2,3,7) is very well known as a starting example of the lens surgery (i.e. hyperbolic knots yielding lens spaces by Dehn surgery), and its Alexander polynomial also has been studied well in the theory of algebraic integers. In this paper, the author studies two equalities concerning the Alexander polynomials of this knot and he also explains his recent research concerning this knot.departmental bulletin pape
The Spectre of Alexander: Cassius Dio and the Alexander-motif
No full textn the opinion of Cassius Dio, Septimius Severus’ capture of Nisibis and annexation of the province of Mesopotamia were not among the emperor’s more worthwhile ventures. The costs were great and the yields slight. Our knowledge of the campaign is sketchy, although we do have a narrative outline supplied by Dio’s eleventh century epitomator, John Xiphilinus. Xiphilinus preserves an anecdote which takes place after Severus and his army had crossed the Euphrates and were starting to feel the effects of thirst and heat. The story, with perhaps one significant difference is a riff on an anecdote told by Arrian, Curtius Rufus, and other authors about Alexander the Great. As with other episodes in the Alexander tradition, the story was something of a ‘floating’ anecdote and appeared in different contexts in different accounts of Alexander’s campaigns. But for the purposes of this article, the story of Severus and his thirsty solders is illustrative of Dio’s allusive employment of what may be termed the ‘Alexander-motif.’ As we shall explore in this article, the figure of Alexander looms large in Dio’s imperial narrative. There are twenty-five direct references to Alexander the Great in the surviving portions of Dio’s history. The number is surprisingly high, especially for a historian not writing about Alexander. For comparison, Tacitus has four, Ammianus fifteen, and the pseudonymous author of the Historia Augusta nineteen references, of which fourteen are in the Life of Severus Alexander. Only Appian has more, yet the bulk of these fall in his Syrian Wars. If we exclude the Syrian Wars and the CaesarAlexander comparison in the second book of the Civil Wars, there are fifteen
Métricas de autor Alexander Sellamén-Garzón
No full textInforme de las métricas de autor del Dr. Alexander Sellamén-Garzón de las publicaciones indexadas en Google Académico cuyo objetivo es entregar un insumo para el fortalecimiento de las capacidades y potencialidades de los autores de la Universidad Santo Tomás en el posicionamiento y visibilidad de sus publicacionesReport of the author metrics Alexander Sellamén-Garzón of the publications indexed in Google Scholar whose objective is to provide an input for the strengthening of the capacities and potentialities of the authors of the Santo Tomás University in the positioning and visibility of their publicationshttp://unidadinvestigacion.usta.edu.c
- …
