1,291 research outputs found
sj-docx-2-cpc-10.1177_10556656241227032 - Supplemental material for Hospital Variation and Resource Use for Infants with Craniosynostosis Undergoing Open, Endoscopic, and Distraction Osteogenesis Surgical Techniques
No full textSupplemental material, sj-docx-2-cpc-10.1177_10556656241227032 for Hospital Variation and Resource Use for Infants with Craniosynostosis Undergoing Open, Endoscopic, and Distraction Osteogenesis Surgical Techniques by Melissa D. Kanack, Mark R. Proctor, John G. Meara, Daniel M. Balkin, Jonathan Rodean, Isabel C. Stringfellow and Jay G. Berry in The Cleft Palate Craniofacial Journal</p
sj-docx-1-cpc-10.1177_10556656241227032 - Supplemental material for Hospital Variation and Resource Use for Infants with Craniosynostosis Undergoing Open, Endoscopic, and Distraction Osteogenesis Surgical Techniques
No full textSupplemental material, sj-docx-1-cpc-10.1177_10556656241227032 for Hospital Variation and Resource Use for Infants with Craniosynostosis Undergoing Open, Endoscopic, and Distraction Osteogenesis Surgical Techniques by Melissa D. Kanack, Mark R. Proctor, John G. Meara, Daniel M. Balkin, Jonathan Rodean, Isabel C. Stringfellow and Jay G. Berry in The Cleft Palate Craniofacial Journal</p
Allen C. Jones Camp of the United Confederate Veterans in Greensboro, Alabama.
No full textFirst row, left to right (numbers 1 through 11): T. J. Kinnaird; William N. Knight; W. C. Tunstall; R. B. Waller; H. T. Waller; Charles E. Waller; George Nabors; N. B. Jones; R. H. Jackson; A. J. Moore; and S. M. Hosmer. Second row, left to right (numbers 12 through 21): John H. Turpin; H. T. Stringfellow; W. G. Britton; T. J. Crawford; Cud Jones; J. A. Ellerbe; Bell [?] Singley; J. Huggins; W. C. Christian; and John G. Apsey
Infrared emission of young HII regions: a Herschel/Hi-GAL study
No full textContext. Investigating the relationship between radio and infrared emission of HII regions may help shed light on the nature of the ionizing stars and the formation mechanism of early-type stars in general.
Aims. We have taken advantage of recent unbiased surveys of the Galactic plane such as Herschel/Hi-GAL and VLA/CORNISH to study a bona fide sample of young HII regions located in the Galactic longitude range 10°–65° by comparing the mid- and far-IR continuum emission to the radio free-free emission at 5 GHz.
Methods. We have identified the Hi-GAL counterparts of 230 CORNISH HII regions and reconstructed the spectral energy distributions of 204 of these by complementing the Hi-GAL fluxes with ancillary data at longer and shorter wavelengths. Using literature data, we obtained a kinematical distance estimate for 200 HII regions with Hi-GAL counterparts and determined their luminosities by integrating the emission of the corresponding spectral energy distributions. We have also estimated the mass of the associated molecular clumps from the (sub)millimeter flux densities.
Results. Our main finding is that for ~1/3 of the HII regions the Lyman continuum luminosity appears to be greater than the value expected for a zero-age main-sequence star with the same bolometric luminosity. This result indicates that a considerable fraction of young, embedded early-type stars presents a “Lyman excess” possibly due to UV photons emitted from shocked material infalling onto the star itself and/or a circumstellar disk. Finally, by comparing the bolometric and Lyman continuum luminosities with the mass of the associated clump, we derive a star formation efficiency of 5%.
Conclusions. The results obtained suggest that accretion may still be present during the early stages of the evolution of HII regions, with important effects on the production of ionizing photons and thus on the circumstellar environment. More reliable numerical models describing the accretion process onto massive stars are required to shed light on the origin of the observed Lyman excess
Assessing the long-term performance of cross-sectoral strategies for national infrastructure
No full textNational infrastructure systems (energy, transport, digital communications, water, and waste) provide essential services to society. Although for the most part these systems developed in a piecemeal way, they are now an integrated and highly interdependent “system of systems.” However, understanding the long-term performance trajectory of national infrastructure has proved to be very difficult because of the complexity of these systems (in physical and institutional terms) and because there is little tradition of thinking cross-sectorally about infrastructure system performance. Here, a methodology is proposed for analyzing national multisectoral infrastructure systems performance in the context of uncertain futures, incorporating interdependencies in demand across sectors. Three contrasting strategies are considered for infrastructure provision (capacity intensive, capacity constrained, and decentralized) and multiattribute performance metrics are analyzed in the context of low, medium, and high demographic and economic growth scenarios. The approach is illustrated using Great Britain and provides the basis for the development and testing of long-term strategies for national infrastructure provision. It is especially applicable to mature industrial economics with a large stock of existing infrastructure and challenges of future infrastructure provision.<br/
Frictional Effects in the Buckling Delamination of a Compressed Thin Film and Implications for Interfacial Fracture
No full textABSTRACTAs a film in residual compression delaminates from a substrate, the post-buckling response of the film tends to drive it into the substrate in the region directly behind the delamination front. We consider the process of frictional interaction between the film and the substrate during the delamination process in order to assess the effect of Coulomb friction on the energy release rate, G, driving the delamination. For the case in which the film and the substrate have identical elastic properties, we derive a singular integral equation to determine the relative sliding displacement of the opposing faces of the interface. Using an analytical model, we find that G decreases by about 35% when the coefficient of interfacial friction is equal to one. Using finite element methods, we then investigate the effects of compliance differences between the film and the substrate. We find that, when the film is more compliant than the substrate, frictional interaction is enhanced and the calculated energy release rate decreases substantially. We conclude that frictional effects can account for a significant portion of the energy dissipation during the delamination process, and thus can play an important role in the observed arrest of spreading delaminations.</jats:p
Screen Printed PZT Composite Thick Films
No full textComposite film (ComFi) technology has been developed as an alternative technique to achieve thick (5–100 ?m) films at temperatures compatible with silicon processing. The technique entails producing a composite slurry consisting of PZT powder and a PZT producing sol. The slurry is then deposited onto the substrate, dried and fired at 710°C. Intermediate sol infiltration and pyrolysis can be used to increase the density and improve the functional properties of the films. A slurry suitable for screen printing has been developed and used to print PZT thick films. The dielectric and piezoelectric properties of the screen printed material are presented. Material properties of the screen printed ComFi material were found to be comparable to, or exceeded, those observed in traditional screen printed materials
Carbon- and Oxygen-rich stars in MaStar: identification and classification
No full textCarbon- and Oxygen-rich stars populating the Thermally-Pulsing Asymptotic
Giant Branch (TP-AGB) phase of stellar evolution are relevant contributors to
the spectra of ~1 Gyr old populations. Atmosphere models for these types are
uncertain, due to complex molecules and mass-loss effects. Empirical spectra
are then crucial, but samples are small due to the short (~3 Myr) TP-AGB
lifetime. Here we exploit the vastness of the MaNGA Stellar library MaStar
(~60,000 spectra) to identify C,O-rich type stars. We define an optical colour
selection with cuts of (g-r)>2 and (g-i)<1.55(g-r)-0.07, calibrated with known
C- and O- rich spectra. This identifies C-,O-rich stars along clean, separated
sequences. An analogue selection is found in V,R,I bands. Our equation
identifies C- and O-rich spectra with predictive performance metric F1-scores
of 0.72 and 0.74 (over 1), respectively. We finally identify 41 C- and 87
O-rich type AGB stars in MaStar, 5 and 49 of which do not have a SIMBAD
counterpart. We also detect a sample of non-AGB, dwarf C-stars. We further
design a fitting procedure to classify the spectra into broad spectral types,
by using as fitting templates empirical C and O-rich spectra. We find
remarkably good fits for the majority of candidates and categorise them into C-
and O-rich bins following existing classifications, which correlate to
effective temperature. Our selection models can be applied to large photometric
surveys (e.g. Euclid, Rubin). The classified spectra will facilitate future
evolutionary population synthesis models.Comment: 16 pages, 13 figures, MNRAS in pres
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