102,399 research outputs found
Letter, [Author unclear] to Paulina T. Merritt
No full textHandwritten letter to Paulina Merritt from an unknown author, October 1, 1876.
Aubé, 1838 (Coleoptera: Dytiscidae)
No full textMathias, K. T., Barman, E. H., Wall, W. P., Montes De Oca, C. A. (2016): An Analysis of Larval Cranial Architecture and Mandibular Geometry ofDytiscus carolinusAubé, 1838 (Coleoptera: Dytiscidae). The Coleopterists Bulletin 70 (2): 347-354, DOI: 10.1649/0010-065X-70.2.347, URL: http://dx.doi.org/10.1649/0010-065x-70.2.34
Figs. 1–6. 1 in An Analysis of Larval Cranial Architecture and Mandibular Geometry ofDytiscus carolinusAubé, 1838 (Coleoptera: Dytiscidae)
No full textFigs. 1–6. 1) Illustration of the computation of temporal curvature using a dorsal view of a third-instar cranium (Barman et al. 2013) of Platambus stagninus (Say, 1823). Dytiscus carolinus: 2) Lateral view of a third-instar cranium illustrating computation of cranial orientation; 3) Ventral view of a third-instar mandible illustrating the method for estimating angle of attack (Wall et al. 2006; Barman et al. 2014) and medial (MArc) and lateral (LArc) arcs (Feduccia 1993; Wall et al. 2006; Barman et al. 2014); Ventral view of cranium and mandibles of 4) First instar; 5) Second instar; 6) Third instar. Scale bars = 1 mm. CS = coronal suture; OR = occipital region; TR = temporal region.Published as part of <i>Mathias, K. T., Barman, E. H., Wall, W. P. & Montes De Oca, C. A., 2016, The Coleopterists Bulletin 70 (2)</i> on pages 347-354, DOI: 10.1649/0010-065X-70.2.347, <a href="http://zenodo.org/record/10106826">http://zenodo.org/record/10106826</a>
Radiative transfer in circumstellar disks
No full textWe present a new code for the calculation of the 1D
structure and synthetic spectra of accretion disks. The code is an
extension of the general purpose stellar atmosphere code
PHOENIX and is therefore capable of including extensive lists
of atomic and molecular lines as well as dust in the calculations. We
assume that the average viscosity can be represented by a critical
Reynolds number in a geometrically thin disk and solve the structure
and radiative transfer equations for a number of disk rings in the
vertical direction. The combination of these rings provides the total
disk structure and spectrum. Since the warm inner regions of
protoplanetary disks show a rich molecular spectrum, they are well
suited for a spectral analysis with our models. In this paper we test
our code by comparing our models with high-resolution VLT CRIRES
spectra of the T Tauri star GQ Lup
POTHIER, THE STRAYING MULE AND THE UNRULY BARMAN Costa Da Oura Restaurant (Pty) Ltd t/a Umdloti Bush Tavern v Reddy 2003 4 SA 34 (SCA)
No full textOn the evening of 31 October 1997, the respondent and his girlfriend visited the Umdloti Bush Tavern. A person by the name of Goldie was stationed behind the bar serving the customers. It appeared to the respondent that Goldie served everyone but him and his girlfriend. When another barman approached him, the respondent remarked that Goldie could take a few lessons regarding service from the second barman. Goldie heard this remark, became agitated and glared at the respondent. He further beckoned the respondent to come closer. The respondent reacted by saying words to the effect that he “did not come for people like that” (Costa Da Oura Restaurant (Pty) Ltd T/A Umdloti Bush Tavern v Reddy 2003 4 SA 34 (SCA) par 30). This further agitated Goldie and he occasionally stared at the respondent and appeared to be aggressive. When the respondent and his girlfriend were about to leave, the respondent generously tipped the barman who had served them. Goldie saw this and quickly exited the bar. When the respondent reached the corridor in the immediate vicinity of the bar, Goldie assaulted him, causing injuries which were reasonably serious. Immediatelyafter the incident the manager of the Umdloti Bush Tavern summarily dismissed Goldie “because he had broken the rules that regulated how he should perform his basic duties” (par 41). The simple question to be decided was whether the appellant wasvicariously liable under the circumstances. The crux of the respondent’s contentions was that the incident was sufficiently connected with the scope of employment of the appellant’s employee to establish vicarious liability, while the appellant contended that Goldie had acted for personal vengeance, on his own, against instructions and after he had abandoned his duties as a barman. The Durban and Coast Local Division in Reddy v Costa da Oura Restaurant (Pty) Ltd t/a Umdloti Bush Tavern (supra) found the appellant vicariously liable for damages resulting from the incident. On appeal the decision was reversed. The purpose of this discussion is to analyse the finding of the Supreme Court of Appeal and to ascertain whether the employer, in the circumstances of this case, should have been held liable. In the process of doing so, the background to the ruling will be explained and the legal policy implications of the decision assessed
SDSS J212531.92–010745.9 : the first definite PG 1159 close binary system
No full textAims. The archival spectrum of SDSS J212531.92−010745.9 shows not only the typical signature of a PG 1159 star, but also indicates the presence of a companion. Our aim was the proof of the binary nature of this object and the determination of its orbital period.
Methods. We performed time-series photometry of SDSS J212531.92−010745.9. We observed the object during 10 nights, spread over one month, with the Tübingen 80 cm and the Göttingen 50 cm telescopes. We fitted the observed light curve with a sine and simulated the light curve of this system with the nightfall program. Furthermore, we compared the spectrum of SDSS J212531.92−010745.9 with
NLTE models, the results of which also constrain the light curve solution.
Results. An orbital period of 6.95616(33) h with an amplitude of 0.354(3) mag is derived from our observations. A pulsation period could not be detected. For the PG 1159 star we found, as preliminary results from comparison with our NLTE models, T eff ∼ 90 000 K, log g ∼ 7.60, and the abundance ratio C/He ∼ 0.05 by number fraction. For the companion we obtained with a mean radius of 0.4 ± 0.1 R, a mass of 0.4 ± 0.1 M, and a temperature of 8200 K on the irradiated side, good agreement between the observed light curve and the nightfall simulation, but we do not regard those values as final
On exploiting nonparametric kernel-based probabilistic machine learning over the large compositional space of high entropy alloys for optimal nanoscale ballistics
No full textThe large compositional space of high entropy alloys (HEA) often presents significant challenges in comprehensively deducing the critical influence of atomic composition on their mechanical responses. We propose an efficient nonparametric kernel-based probabilistic computational mapping to obtain the optimal composition of HEAs under ballistic conditions by exploiting the emerging capabilities of machine learning (ML) coupled with molecular-level simulations. Compared to conventional ML models, the present Gaussian approach is a Bayesian paradigm that can have several advantages, including small training datasets concerning computationally intensive simulations and the ability to provide uncertainty measurements of molecular dynamics simulations therein. The data-driven analysis reveals that a lower concentration of Ni with a higher concentration of Al leads to higher dissipation of kinetic energy and lower residual velocity, but with higher penetration depth of the projectile. To deal with such conflicting computationally intensive functional objectives, the ML-based simulation framework is further extended in conjunction with multi-objective genetic algorithm for identifying the critical elemental compositions to enhance kinetic energy dissipation with minimal penetration depth and residual velocity of the projectile simultaneously. The computational framework proposed here is generic in nature, and it can be extended to other HEAs with a range of non-aligned multi-physical property demands
Handwritten biographical information on Paulina T. McClung Merritt
No full textA handwritten biography of Paulina T. McClung Merritt by an unknown author, 1892.
Heterogeneous and tissue-specific regulation of effector T cell responses by IFN-gamma during Plasmodium berghei ANKA infection.
No full textIFN-γ and T cells are both required for the development of experimental cerebral malaria during Plasmodium berghei ANKA infection. Surprisingly, however, the role of IFN-γ in shaping the effector CD4(+) and CD8(+) T cell response during this infection has not been examined in detail. To address this, we have compared the effector T cell responses in wild-type and IFN-γ(-/-) mice during P. berghei ANKA infection. The expansion of splenic CD4(+) and CD8(+) T cells during P. berghei ANKA infection was unaffected by the absence of IFN-γ, but the contraction phase of the T cell response was significantly attenuated. Splenic T cell activation and effector function were essentially normal in IFN-γ(-/-) mice; however, the migration to, and accumulation of, effector CD4(+) and CD8(+) T cells in the lung, liver, and brain was altered in IFN-γ(-/-) mice. Interestingly, activation and accumulation of T cells in various nonlymphoid organs was differently affected by lack of IFN-γ, suggesting that IFN-γ influences T cell effector function to varying levels in different anatomical locations. Importantly, control of splenic T cell numbers during P. berghei ANKA infection depended on active IFN-γ-dependent environmental signals--leading to T cell apoptosis--rather than upon intrinsic alterations in T cell programming. To our knowledge, this is the first study to fully investigate the role of IFN-γ in modulating T cell function during P. berghei ANKA infection and reveals that IFN-γ is required for efficient contraction of the pool of activated T cells
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
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