The measurement of rotational broadening in post-common-envelope binaries     

James N. Bleach  Janet H. Wood  B. Smalley  M. S. Catalán 《Monthly notices of the Royal Astronomical Society》2002,336(2):611-620

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Spectroscopic constraints on outflows from BN-type objects     

Janet E. Drew 《Astrophysics and Space Science》1994,216(1-2):45-54

New high-quality high spectral resolution observations of the HI line emission from massive young stellar objects are described and discussed. It is proposed that two distinct physical components contribute to the observed emission. One of these is an optically-thick high-velocity stellar wind, the other a more slowly moving optically-thin volume of gas that may, in the case of S106IR at least, be caused by mass loading of the stellar wind. This decomposition is shown to resolve a long-standing problem regarding the relative widths of high and low opacity lines.  相似文献   

De Draconis: Spectroscopic orbit,rotation effect and physical model     

Douglas P. Hube  Janet S. Couch 《Astrophysics and Space Science》1982,81(1-2):357-368

New spectroscopic observations are used for the determination of orbital elements and for a study of the rotation effect of DE Draconis. The primary component is found to rotate much faster than the synchronous rate and with its axis of rotation possibly inclined with respect to the perpendicular to the orbital plane. The system is fully detached and the stars are relatively young and unevolved.  相似文献   

Inundation of a low-lying urban atoll island: Majuro,Marshall Islands     

Ford  Murray  Merrifield  Mark A.  Becker  Janet M. 《Natural Hazards》2018,91(3):1273-1297

Natural Hazards - Majuro is a low-lying island perched on a coral atoll in the central Pacific Ocean and is home to nearly 28,000 people. Considered highly vulnerable to the impacts of marine...  相似文献   

The rail-cutter: a simple,cheap and compact system for opening sediment cores in the lab and field     

Graeme N. D. Rogers  Karen I. Bonner  Jamie R. Wood  Janet M. Wilmshurst 《Journal of Paleolimnology》2015,53(4):433-436

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Proposal for applying a component-based mixture approach for ecotoxicological assessment of fracturing fluids   总被引：2，自引：2，他引：0  

Janet Riedl  Stefanie Rotter  Sonja Faetsch  Mechthild Schmitt-Jansen  Rolf Altenburger 《Environmental Earth Sciences》2013,70(8):3907-3920

Hydraulic fracturing is increasingly being used to produce gas from unconventional resource sites for energy supply. Therefore, concerns about risks of this technology related to human health and the environment have to be addressed. Among the major issues is the potential contamination of surrounding water systems by chemical additives used in fracturing fluids. In this study, the ecotoxicological hazards of fracturing fluids, both, their individual components (chemicals) as well as their mixtures (product) were assessed using a component-based mixture approach. For five exemplary fracturing fluids, 40–90 wt% of the contained substances could unambiguously be defined in their chemical identity. The concentrations used in the applied fluid mixture were considered as (maximum) exposure concentrations. For components with mass fractions between 10 and 74 wt%, the effect concentrations for acute and chronic toxicity of fish, daphnia and algae were retrieved from experimental databases and through predictive modeling. The hazard indices calculated from the ratio of exposure to effect concentration were >1 for all fracturing fluids, using different scenarios. This indicated a hazard from the undiluted fracturing fluids. The assessment framework presented in this study allows for dealing with data gaps and uncertainties in a tiered fashion and in particular accommodates for combined effects resulting from chemical mixtures. It might be employed for ecotoxicological risk assessment of products containing chemical mixtures and optimization of their environmental performance.  相似文献   

‘I’ve got my Sat Nav,it’s alright’: Users’ Attitudes towards,and Engagements with,Technologies of Navigation     

Janet Speake 《The Cartographic journal》2013,50(4):345-355

The use of qualitative research techniques in a largely quantitative cartographic domain is opening up myriad ways to explore users’ engagements technologies of navigation. This study draws on young UK-based students’ real words and life experiences as they engage with Satellite Navigation and other wayfinding technologies during first-time visits to new places to reflect on the nature of the changing relationships between self, navigational object, space and place.  相似文献   

Deposition of 1.88-billion-year-old Iron Formations as a Consequence of Rapid Crustal Growth     

Birger Rasmussen  Ian R. Fletcher  Andrey Bekker  Janet R. Muhling  Courtney J. Gregory  Alan M. Thorne 《Journal of the Geological Society of India》2012,80(1):147

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Real-time PCR and NASBA for rapid and sensitive detection of Vibrio cholerae in ballast water   总被引：2，自引：0，他引：2  

Fykse EM  Nilsen T  Nielsen AD  Tryland I  Delacroix S  Blatny JM 《Marine pollution bulletin》2012,64(2):200-206

Transport of ballast water is one major factor in the transmission of aquatic organisms, including pathogenic bacteria. The IMO-guidelines of the Convention for the Control and Management of Ships' Ballast Water and Sediments, states that ships are to discharge <1 CFU per 100 ml ballast water of toxigenic Vibrio cholerae, emphasizing the need to establish test methods. To our knowledge, there are no methods sensitive and rapid enough available for cholera surveillance of ballast water. In this study real-time PCR and NASBA methods have been evaluated to specifically detect 1 CFU/100ml of V. cholerae in ballast water. Ballast water samples spiked with V. cholerae cells were filtered and enriched in alkaline peptone water before PCR or NASBA detection. The entire method, including sample preparation and analysis was performed within 7 h, and has the potential to be used for analysis of ballast water for inspection and enforcement control.  相似文献   

Nyctiphanes australis (Euphausiacea) and an upwelling plume in western Cook Strait,New Zealand   总被引：1，自引：1，他引：0  

Janet M. Bradford  Bruce Chapman 《新西兰海洋与淡水研究杂志》2013,47(2):237-247

Quantitative data are presented on the distribution of adult and larval stages of the euphausiid Nyctiphanes australis G. O. Sars, in western Cook Strait, New Zealand, an area influenced by an upwelling plume. The behaviour of N. australis in the Kahurangi Point region at different stages of its life history appears to ensure its maintenance, in general, over the continental shelf on an upwelling coast. Population structure at the source of the upwelling near Kahurangi Point differed from that in regions “down stream” from the plume. Nyctiphanes australis was most abundant at the “downstream” eastern end of the upwelling plume, and the evidence suggesting that the dense populations there may be resident is discussed. Possible reasons for low densities of furcilia II and III stages in the eastern plume region are considered.  相似文献