2,359 research outputs found
Reduction of eyes in last-instar beetle larvae: a special observation in Trictenotomidae, based on Trictenotoma formosana Kriesche, 1919
Recently, Lin & Hu (2018, 2019) unraveled the biology of Trictenotoma formosana Kriesche, 1919. For the first time since Gahan (1908) there is fresh immature stages material available for Trictenotomidae.This is the published poster presentation
Phantom Friedmann Cosmologies and Higher-Order Characteristics of Expansion
We discuss a more general class of phantom () cosmologies with
various forms of both phantom () matter. We
show that many types of evolution which include both Big-Bang and Big-Rip
singularities are admitted and give explicit examples. Among some interesting
models, there exist non-singular oscillating (or "bounce") cosmologies, which
appear due to a competition between positive and negative pressure of variety
of matter content. From the point of view of the current observations the most
interesting cosmologies are the ones which start with a Big-Bang and terminate
at a Big-Rip. A related consequence of having a possibility of two types of
singularities is that there exists an unstable static universe approached by
the two asymptotic models - one of them reaches Big-Bang, and another reaches
Big-Rip. We also give explicit relations between density parameters
and the dynamical characteristics for these generalized phantom models,
including higher-order observational characteristics such as jerk and "kerk".
Finally, we discuss the observational quantities such as luminosity distance,
angular diameter, and source counts, both in series expansion and explicitly,
for phantom models. Our series expansion formulas for the luminosity distance
and the apparent magnitude go as far as to the fourth-order in redshift
term, which includes explicitly not only the jerk, but also the "kerk" (or
"snap") which may serve as an indicator of the curvature of the universe.Comment: REVTEX 4, 23 pages, references updated, to appear in Annals of
Physics (N.Y.
Functional characterization of the water-soluble organic carbon of size-fractionated aerosol in the southern Mississippi Valley
The chemical content of water-soluble organic carbon (WSOC) as a function of
particle size was characterized in Little Rock, Arkansas in winter and spring
2013. The objectives of this study were to (i) compare the functional
characteristics of coarse, fine and ultrafine WSOC and (ii) reconcile the
sources of WSOC for periods when carbonaceous aerosol was the most abundant
particulate component. The WSOC accounted for 5% of particle mass for
particles with <i>d</i><sub>p</sub> > 0.96 μm and 10%
of particle mass for particles with
<i>d</i><sub>p</sub> < 0.96 μm. Non-exchangeable aliphatic
(H–C), unsaturated aliphatic (H–C–C=), oxygenated saturated aliphatic
(H–C–O), acetalic (O–CH–O) and aromatic (Ar–H) protons were determined
by proton nuclear magnetic resonance (<sup>1</sup>H-NMR). The total
non-exchangeable organic hydrogen concentrations varied from
4.1 ± 0.1 nmol m<sup>−3</sup> for particles with
1.5 < <i>d</i><sub>p</sub> < 3.0 μm to
73.9 ± 12.3 nmol m<sup>−3</sup> for particles with
<i>d</i><sub>p</sub> < 0.49 μm. The molar H / C ratios varied
from 0.48 ± 0.05 to 0.92 ± 0.09, which were comparable to those
observed for combustion-related organic aerosol. The R–H was the most
abundant group, representing about 45% of measured total
non-exchangeable organic hydrogen concentrations, followed by H–C–O
(27%) and H–C–C= (26%). Levoglucosan, amines, ammonium and
methanesulfonate were identified in NMR fingerprints of fine particles.
Sucrose, fructose, glucose, formate and acetate were associated with coarse
particles. These qualitative differences of <sup>1</sup>H-NMR profiles for
different particle sizes indicated the possible contribution of biological
aerosols and a mixture of aliphatic and oxygenated compounds from biomass
burning and traffic exhausts. The concurrent presence of ammonium and amines
also suggested the presence of ammonium/aminium nitrate and sulfate secondary
aerosol. The size-dependent origin of WSOC was further corroborated by the
increasing δ<sup>13</sup>C abundance from −26.81 ± 0.18‰ for
the smallest particles to −25.93 ± 0.31‰ for the largest
particles and the relative distribution of the functional groups as compared
to those previously observed for marine, biomass burning and secondary
organic aerosol. The latter also allowed for the differentiation of urban
combustion-related aerosol and biological particles. The five types of
organic hydrogen accounted for the majority of WSOC for particles with
<i>d</i><sub>p</sub> > 3.0 μm and
<i>d</i><sub>p</sub> < 0.96 μm
Variational Density Matrix Method for Warm Condensed Matter and Application to Dense Hydrogen
A new variational principle for optimizing thermal density matrices is
introduced. As a first application, the variational many body density matrix is
written as a determinant of one body density matrices, which are approximated
by Gaussians with the mean, width and amplitude as variational parameters. The
method is illustrated for the particle in an external field problem, the
hydrogen molecule and dense hydrogen where the molecular, the dissociated and
the plasma regime are described. Structural and thermodynamic properties
(energy, equation of state and shock Hugoniot) are presented.Comment: 26 pages, 13 figures. submitted to Phys. Rev. E, October 199
The McGill Face Database: Validation and Insights Into the Recognition of Facial Expressions of Complex Mental States
Social Sciences and Humanities Research Council of Canada gran
Electromagnetic performances and main parameter sensitivity effect on unbalance magnetic flux in a New Single‑Phase FEFSM with segmental rotor
Three-phase field excitation flux switching motor (FEFSM) with salient rotor structure has been introduced with their advantages
of rotor easy temperature elimination and controllable FEC magnetic flux. Yet, the salient rotor structure is found to
lead a longer magnetic flux path between stator and rotor parts, producing a weak flux linkage along with low torque performances.
Hence, a new structure of single-phase FEFSM using segmental rotor with non-overlap windings is proposed with
advantages of shorter magnetic flux path, light weight and robust rotor structure. Analysis on fundamental magnetic flux
characteristics, armature and FEC magnetic flux linkages, cogging torque, back-Emf, various torque capabilities, refinement
of unbalance magnetic flux, and torque-power versus speed characteristics are conducted using 2D FEA through JMAG
Designer version 15. The results show that magnetic flux amplitude ratio has been improved by 41.2% while the highest
torque and power achieved are 1.45 Nm and 343.8 W, respectively
Lower survival after coronary artery bypass in patients who had atrial fibrillation missed by widely used definitions
OBJECTIVE: To investigate the impact of limiting the definition of post-coronary artery bypass graft (CABG) atrial fibrillation (AF) to AF/flutter requiring treatment-as in the Society of Thoracic Surgeons\u27 (STS) database- on the association with survival.
PATIENTS AND METHODS: We assessed in-hospital incidence of post-CABG AF in 7110 consecutive isolated patients with CABG without preoperative AF at 4 hospitals (January 1, 2004 to December 31, 2010). Patients with ≥1 episode of post-CABG AF detected via continuous in-hospital electrocardiogram (ECG)/telemetry monitoring documented by physicians were assigned to the following: Group 1, identified as having post-CABG AF in STS data and Group 2, not identified as having post-CABG AF in STS data. Patients without documented post-CABG AF constituted Group 3. Survival was compared via a Cox model, adjusted for STS risk of mortality and accounting for site differences.
RESULTS: Over 7 years\u27 follow-up, 16.0% (295 of 1841) of Group 1, 18.7% (79 of 422) of Group 2, and 7.9% (382 of 4847) of Group 3 died. Group 2 had a significantly greater adjusted risk of death than both Group 1 (hazard ratio [HR]: 1.16; 95% confidence interval [CI], 1.02 to 1.33) and Group 3 (HR: 1.94; 95% CI, 1.69 to 2.22).
CONCLUSIONS: The statistically significant 16% higher risk of death for patients with AF post-CABG missed vs captured in STS data suggests treatment and postdischarge management should be investigated for differences. The historical misclassification of missed patients as experiencing no AF in the STS data weakens the ability to observe differences in risk between patients with and without post-CABG AF. Therefore, STS data should not be used for research examining post-CABG AF
Aid conditionalities, international Good Manufacturing Practice standards and local production rights: a case study of local production in Nepal
© 2015 Brhlikova et al. This is an Open Access article distributed under the terms of the Creative Commons Attribution License
(http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium,
provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://
creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.This work was supported by the Economic and Social Research Council and
the Department for International Development [RES-167-25-0110] through
the collaborative research project
Tracing Pharmaceuticals in South Asia
(2006
–
2009). In addition to the authors of this paper, the project team
included: Soumita Basu, Gitanjali Priti Bhatia, Erin Court, Abhijit Das, Stefan
Ecks, Patricia Jeffery, Roger Jeffery, Rachel Manners, and Liz Richardson.
Martin Chautari (Kathmandu) and the Centre for Health and Social Justice
(New Delhi) provided resources drawn upon in writing this paper but are
not responsible for the views expressed, nor are ESRC or DFID.
Ethical review was provided by the School of Social and Political Science at
the University of Edinburgh, and ethical approval in Nepal for the study
granted by the Nepal Health Research Council (NHRC)
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