| 21. |
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| 22. |
- Mundy, Lee G., et al.
(författare)
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High-resolution images of the Orion molecular ridge in the CS J = 2-1 transition
- 1988
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Ingår i: Astrophysical Journal. - Philadelphia, PA : Institute of Physics Publishing (IOPP). - 0004-637X .- 1538-4357. ; 325:1, s. 382-388
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Tidskriftsartikel (refereegranskat)abstract
- The authors have constructed 7arcsec.5 resolution images of the CS J = 2-1 emission from a 3arcmin.5 section of the Orion molecular ridge using a maximum entropy algorithm to combine Owens Valley Millimeter-Wave Interferometer and Onsala Space Observatory 20 m data. The resulting images include all of the flux and have positional accuracy of 1arcsec-2arcsec on the small-scale features. The observed section of the ridge includes four condensations. The condensations have dimensions from 0.03 to 0.11 pc and virial massses from 30 to 80 M_sun;. Approximately 70% of the total mass within the 3arcmin region is contained in these condensations.
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| 23. |
- Nottingham, A. T., et al.
(författare)
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Annual to decadal temperature adaptation of the soil bacterial community after translocation across an elevation gradient in the Andes
- 2021
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Ingår i: Soil Biology and Biochemistry. - : Elsevier BV. - 0038-0717. ; 158
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Tidskriftsartikel (refereegranskat)abstract
- The response of soil microbial activity to climate warming has been predicted to have a large destabilising effect on the carbon cycle. However, the nature of this feedback remains poorly understood, especially in tropical ecosystems and across annual to decadal timescales. We studied the response of bacterial community growth to 2 and 11 years of altered temperature regimes, by translocating soil across an elevation gradient in the tropical Andes. Soil cores were reciprocally translocated among five sites across 3 km in elevation, where mean annual temperature (MAT) ranged from 26.4 to 6.5°C. The bacterial community growth response to temperature was estimated using a temperature Sensitivity Index (SI): the log-ratio of growth determined by leucine incorporation at 35°C: 4°C. Bacterial communities from soil translocated to their original site (controls) had a growth response assumed to be ‘adapted’ to the original MAT. Translocating soil downslope (warming) resulted in an increased SI relative to their original growth response, and vice versa under cooling, indicating community-level adaptation over the incubation period to the altered MAT. The average level of adaptation (i.e., the extent to which SI converged on the control values) was 77% after 2 years, and was complete after 11 years. The adaptive response was faster when soil was warmed rather than cooled: instances of complete adaptation of SI occurred in soils after 2 years when warmed, but only after 11 years when they were cooled. Taken together, our results show that the majority of the growth adaptation to warming by the bacterial community occurs rapidly, within 2 years, whilst growth adaptation to cooling occurs within a decade. Our analysis demonstrates rapid warm-adaptation of bacterial community growth, with potential consequences for the temperature sensitivity of soil carbon cycling in response to future climate warming.
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| 24. |
- Okopi, J. E., et al.
(författare)
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Wide field mapping of 5C12
- 1991
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Ingår i: Radio Interferometry. - San Francisco, USA : Astronomical Society of the Pacific. - 0937707384 - 9780937707388 ; , s. 253-256
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Konferensbidrag (refereegranskat)abstract
- A wide-field mapping technique aimed at resolving problems which occur in the radio mapping of very wide fields is described. The technique has been successfully applied to Merlin observations of the 5C12 region covering an area of 1800 arcsec x 180 arcsec.
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| 25. |
- Rantakyrö, Fredrik T., et al.
(författare)
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Multiband VLBI observations of CTA 102
- 1996
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 310:1, s. 66-74
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Tidskriftsartikel (refereegranskat)abstract
- The source CTA102, known to exhibit low frequency variability, has been observed at six epochs (three at λ32cm, two at λ18cm, and one at λ1.3cm) with intercontinental VLBI arrays. On the basis of the changes observed in the structure, we believe that the flux density variations at these wavelengths are due to intrinsic processes and not due to interstellar scintillation. This source exhibits behaviour suggestive of being expanding with a very high apparent transverse velocity.
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| 26. |
- Stannard, D., et al.
(författare)
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VLBI Observations of 3C345 at 1.67 GHz
- 1980
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Ingår i: Monthly notices of the Royal Astronomical Society. - Oxford : Oxford University Press. - 0035-8711 .- 1365-2966. ; 192:4, s. 555-560
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Tidskriftsartikel (refereegranskat)abstract
- VLBI observations of the quasar 3C 345 suggest that the milliarcsec subcomponents in the core have approximately equal intensities at 1.67 GHz. A new compact feature is detected in the inner jet structure at a distance of ∼ 12 m.arcsec from the core. © 1980 Royal Astronomical Society. Provided by the NASA Astrophysics Data System
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| 27. |
- Sving, E., et al.
(författare)
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The experiences of operating room teams working with real-time feedback of interface pressure to prevent pressure injuries : A feasibility study
- 2020
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Ingår i: Perioperative Care and Operating Room Management. - : Elsevier BV. - 2405-6030. ; 20
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Tidskriftsartikel (refereegranskat)abstract
- Background: Surgical patients have an increased risk of sustaining a pressure induced injury. Novel technology has made it possible to objectively measure and visualize the interface pressure between the patient's tissue and the support surface in real time. The aim of this study was to describe operating room team members’ experiences of working with a pressure mapping system as a means to prevent intraoperative and postoperative recovery unit pressure injuries, and to describe the interface pressures and the incidence of observed pressure injuries. Methods: We used a descriptive design with a qualitative approach to investigate the operating room team members’ experiences of working with real-time feedback of interface pressure, and a quantitative approach to investigate the interface pressures and the incidence of observed pressure injuries. The technology was used during 49 surgeries. Results: The system increased clinician awareness and was considered beneficial in pressure injury prevention activities. There were wide variations in the interface pressures that measured from < 50 to 255 mmHg. Eight patients developed blanchable erythema during surgery and five other patients developed category 1 pressure injuries two hours postoperatively. Conclusions: This study shows that the new technology could play an important role in preventing pressure injuries during surgery in the future.
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| 28. |
- Zhang, F. J., et al.
(författare)
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1404+286 : A non-ideal calibrator for VLBI observations
- 1994
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Ingår i: Astronomy and Astrophysics. - Les Ulis : EDP Sciences. - 0004-6361 .- 1432-0746. ; 281:3, s. 649-652
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Tidskriftsartikel (refereegranskat)abstract
- The radio source 1404+286 was observed with global VLBI arrays at 5 and 1.67 GHz in 1990.88 and 1991.45 respectively. High quality maps are presented in this paper, and show the source to be resolved at both frequencies with a core-jet like structure extending approximately 6 mas in position angle approximately -145-degrees. The jet direction is similar in both maps. 1404+286 has often been used in the past as a flux density calibrator or a phase referencing source. Our results show that this source is not an ideal calibrator on VLBI scales.
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| 29. |
- Zhang, F.J., et al.
(författare)
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Are there two engines at the center of 3C 286?
- 1994
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Ingår i: Astronomy and Astrophysics. - Les Ulis : EDP Sciences. - 0004-6361 .- 1432-0746. ; 287:1, s. 32-37
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents images of the compact steep-spectrum quasar 3C 286 obtained with global VLBI arrays at 4.99 and 1.66 GHz. The morphology appears to be intermediate between the core-jet types and grossly distorted objects. The central portion is resolved into two components of almost equal peak brightnesses and spectral indices. On the 1.66 GHz map, the jet extends in position angle approximately -136-degrees, up to a knot (W1) (approximately 75 mas from the component C2) from which it curves rapidly towards the west to form another knot (W2). It is possible that the VLBI jet bends further towards the secondary component separated from the core by approximately 2.6'' in p.a. -115-degrees seen in high dynamic range VLA or Merlin maps. The jet has a sinuous feature shown clearly on the 5 GHz map. There is a low brightness extension at the North (designated N1) shown on both the 1.66 and 5 GHz maps, which is connected to the component C1 and bends towards the east.
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