Calculations of infrared fluxes from galactic sources for a polysaccharide grain model     

F. Hoyle  N. C. Wickramasinghe 《Astrophysics and Space Science》1978,53(2):489-505

Using transmittance data appropriate for grain material which is predominantly comprised of polysaccharides we have computed infrared fluxes from several types of galactic infrared source. The model used in these computations involves polysaccharide condensation in material flowing out from O-type stars. With the exception of rather minor discrepancies we show that it is possible to match the 2.1–13 observations of a wide range of galactic infrared sources.  相似文献   

Infrared spectroscopy over the 2.9–3.9 μm waveband in biochemistry and astronomy     

F. Hoyle  N. C. Wickramasinghe  S. Al-Mufti  A. H. Olavesen  D. T. Wickramasinghe 《Astrophysics and Space Science》1982,83(1-2):405-409

The infrared spectrum of the galactic centre source IRS 7 over the 2.9–3.9 m waveband is interpreted as strong evidence for bacterial grains.  相似文献   

Evidence that polycyclic aromatic hydrocarbons in two carbonaceous chondrites predate parent-body formation     

Fiona L Plows  Richard N Zare  Peter R Buseck 《Geochimica et cosmochimica acta》2003,67(7):1429-1436

Organic material in meteorites provides insight into the cosmochemistry of the early solar system. The distribution of polycyclic aromatic hydrocarbons (PAHs) in the Allende and Murchison carbonaceous chondrites was investigated by use of a technique called microprobe laser-desorption laser-ionization mass spectrometry, which permits spatial resolution with approximately a 40-μm spot size. Sharp chemical gradients of PAHs are associated with specific meteorite features. The ratios of various PAH intensities relative to the smallest PAH, naphthalene, are nearly constant across the sample. These findings suggest a common origin for PAHs dating before or during the formation of the parent body, consistent with proposed interstellar formation mechanisms.  相似文献   

Crustal structure across the Canadian High Arctic region from teleseismic receiver function analysis   总被引：1，自引：0，他引：1  

Fiona A. Darbyshire 《Geophysical Journal International》2003,152(2):372-391

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Community Cohesion: Social and Economic Ties in the Personal Networks of Fisherfolk     

Fiona Nunan  Dražen Cepić  Bwambale Mbilingi  Konstantine Odongkara  Ernest Yongo  Monica Owili 《社会与自然资源》2018,31(3):306-319

Social ties influence access to knowledge and cooperation in natural resource management, with the sharing of certain characteristics thought to be positive for social cohesion and participatory forms of management. In this article, a holistic characterisation of fisherfolk personal networks is developed, disaggregating results by the main occupational groups within the fisheries studied, to provide a more nuanced understanding of the personal networks of types of fisherfolk. Links are then made between the characteristics of personal networks and evidence on how fisherfolk benefit from their networks, interpreted as contributing to social cohesion within the communities. The personal networks of fisherfolk (boat crew, boat owners and traders/processors) of Kenya, Tanzania and Uganda bordering Lake Victoria were investigated using personal network analysis, with fisherfolk asked who they discuss their fisheries activities with. The analysis found that networks based on the same occupation were more characteristic of fish traders/processors networks than those of boat crew and boat owners and that shared ethnicity, gender and location were characteristic of boat owner and boat crew networks, though shared ethnicity may reflect the composition of the communities rather than choice. Social and economic interactions within the networks were based on provision of credit, social support and advice, suggesting that these form the basis of social cohesion and should be taken into consideration in working with fishing communities in both development interventions and designing collaborative management approaches.  相似文献   

Development of the HEFT and NuSTAR focusing telescopes     

Fiona A. Harrison  Finn E. Christensen  William Craig  Charles Hailey  Wayne Baumgartner  C. M. H. Chen  James Chonko  W. Rick Cook  Jason Koglin  Kristin-Kruse Madsen  Michael Pivavoroff  Steven Boggs  David Smith 《Experimental Astronomy》2005,20(1-3):131-137

Hard X-ray/soft gamma-ray astrophysics is on the verge of a major advance with the practical realization of technologies capable of efficiently focusing X-rays above 10 keV. Hard X-ray focusing telescopes can achieve orders of magnitude improvements in sensitivity compared to the instruments based on coded apertures and collimated detectors that have traditionally been employed in this energy band. Compact focal planes enable high-performance detectors with good spectral resolution to be employed in efficient, low-background configurations. We have developed multilayer coated grazing incidence optics and solid state Cadmium Zinc Telluride focal plane systems for the High Energy Focusing Telescope (HEFT) balloon-borne experiment, and for the Nuclear Spectroscopic Telescope Array (NuSTAR) Small Explorer satellite. In this paper we describe the technologies, telescope designs, and performance of both experiments.  相似文献   

High‐energy sedimentation,Creag Aoil,Spean Bridge,Scotland: implications for meltwater movement and storage during Loch Lomond Stadial (Younger Dryas) ice retreat     

Andrew J. Russell  Fiona S. Tweed  Tim Harris 《第四纪科学杂志》2003,18(5):415-430

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Radiocarbon dating of charcoal from tropical sequences: results from the Niah Great Cave,Sarawak, and their broader implications     

Thomas F. G. Higham  Huw Barton  Chris S. M. Turney  Graeme Barker  Christopher Bronk Ramsey  Fiona Brock 《第四纪科学杂志》2009,24(2):189-197

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Present and past bio-available phosphorus budget in the ultra-oligotrophic Lake Brienz     

Beat Müller  David Finger  Michael Sturm  Volker Prasuhn  Thomas Haltmeier  Peter Bossard  Catherine Hoyle  Alfred Wüest 《Aquatic Sciences - Research Across Boundaries》2007,69(2):227-239

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The Durham/UKST Galaxy Redshift Survey – VII. Redshift-space distortions in the power spectrum     

P. J. Outram  Fiona Hoyle  T. Shanks 《Monthly notices of the Royal Astronomical Society》2001,321(3):497-501

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