Harp seal (Phoca groenlandica) invasions in Norwegian coastal waters: age composition and feeding habits     

Haug  Tore; Kroyer  Ari B.; Nilssen  Kjell T.; Ugland  Karl I.; Aspholm  Paul E. 《ICES Journal of Marine Science》1991,48(3):363-371

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Food habits of harp seals (Phoca groenlandica) during lactation and moult in March-May in the southern Barents Sea and White Sea   总被引：1，自引：0，他引：1  

Nilssen  Kjell T.; Haug  Tore; Potelov  Vladimir; Stasenkov  Vladimir A.; Timoshenko  Yuri K. 《ICES Journal of Marine Science》1995,52(1):33-41

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Nonlinear generation of ion loss-cone waves by electrostatic turbulence in the magnetosphere     

Kjell Rönnmark 《Planetary and Space Science》1977,25(2):149-154

Effects of plasma turbulence on the stability of electrostatic ion loss-cone waves are examined. The turbulence is assumed to be electrostatic with frequencies near 1.5 times the electron gyrofrequency and the frequencies of the generated waves are below the ion plasma frequency ω_pi>. A nonlinear growth rate of the order of 10^?2ω_pi may be obtained, when the amplitude of the turbulence is 20 mV/m. This is comparable to previously found growth rates of the linear ion loss-cone instability, in a plasma with large pitch angle anisotropy. Bounce averaged pitch angle diffusion coefficients are also presented for different models of the ion loss-cone wave spectrum.  相似文献   

Feeding habits of harp and hooded seals in drift ice waters along the east coast of Greenland in summer and winter   总被引：2，自引：0，他引：2  

Tore Haug  Kjell T. Nilssen  Lotta Lindblom 《Polar research》2004,23(1):35-42

Results of analyses of stomach and intestinal contents from hooded ( Cystophora cristata ) and harp ( Phoca groenlandica ) seals captured in the pack ice belt of the Greenland Sea in summer (July-August) in 2000 and winter (February-March) in 2001 revealed that the diet of both species were comprised of relatively few prey taxa. Pelagic amphipods of the genus Parathemisto , the squid Gonatus fabricii , polar cod ( Boreogadus saida ) and capelin ( Mallotus villosus ) constituted 63-99% of the observed diet biomass in both seal species, irrespective of sampling period, but their relative contribution to the diet varied both with species and sampling period/area. For hooded seals, G. fabricii and capelin were the dominant food items in winter 2001, but the summer 2000 diet comprised a mixture of this squid and polar cod. Parathemisto was most important for the harp seals during summer 2000; in winter 2001 the contribution from krill and capelin were comparable to that of Parathemisto . Multivariate analyses revealed differences in the intestinal contents of hooded and harp seals in areas where the two species' occurrence spatially overlapped. Different foraging depths of the two species may have contributed to the observed differences in diets.  相似文献   

The control of maturity and kerogen type on quantitative analytical pyrolysis data     

Kjell ygard  Steve Larter  Joe Senftle 《Organic Geochemistry》1988,13(4-6)

Quantitative pyrolysis-gas chromatography has been performed on 96 kerogen samples isolated from 17 wells on the Norwegian Continental shelf. Petrographic and bulk geochemical measurements were also performed on the samples, and a combined data set of 117 variables for each sample was analysed using principal components analysis (PCA). This approach provides an objective and reproducible means of kerogen characterisation, which can be easily automated. In addition to objective kerogen characterisation and facile visualisation of facies and maturity related chemical trends, the method has the potential to allow objective prediction of key geochemical parameters such as maturity level from pyrogram data.  相似文献   

Internationalization — an essential strategy for a Swedish textile firm?     

Kjell Gustafsson PhD 《GeoJournal》1984,9(2):121-131

Corporate strategies and results of three Swedish textile companies are discussed against international trends. The country's high wage level and low import duties have prompted the surviving companies to resort to improved quality and design, sophisticated production technology and, in particular, internationalization. Internationalization is seen as a manifestation of the structural necessity of capitalistic companies to expand, with monopoly as the ultimate goal. Internationalization has implied both the establishment of new product lines abroad and the transfer of existing lines from Sweden. Diversification has also proved successful although the firms have increasingly lost their character as textile companies. Government subsidies have been instrumental for continued domestic textile production but detrimental to corporate growth.  相似文献   

Book reviews     

D. J. M. Hooson  H. Clout  Kjell Stenstadvold  E. Gabriel 《GeoJournal》1977,1(6):94-95

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The excitation of atomic oxygen to the $\text{O(}{}^1\text{S)}$ level by energy transfer from N₂(A³∑_u⁺) molecules in aurora     

Kjell Henriksen 《Planetary and Space Science》1973,21(5):863-871

The part that the energy transfer reaction $\text{N}{}_2\text{(A}{}^3\text{∑}{}_{\mathrm{u}}{}^{\mathrm{+}}\text{) + O(}{}^3\text{P) → N}{}_2\text{(X}{}^1\text{∑}{}_{\mathrm{g}}{}^{\mathrm{+}}\text{) + O(}{}^1\text{S)}$ plays in the excitation of the auroral green line has been investigated. The contribution is estimated to be 40 per cent in this case, containing pulsating aurora in class IBC 1. Due to greater quenching of the A³∑_u⁺ state, the centroid of the VK emission is displaced 10 km upwards of the green line height, which is centred at 110 km.  相似文献   

Is pure groundwater safe to drink?: natural "contamination' of groundwater in Norway   总被引：1，自引：0，他引：1  

David Banks  Aase Kjersti Midtgrd  Geir Morland  Clemens Reimann  Terje Strand  Kjell Bjorvatn  & Ulrich Siewers 《Geology Today》1998,14(3):104-113

The title of this article is designed to provoke. Naturally occurring parameters are, by definition, not contamination. Nevertheless, nature is not necessarily nice, and naturally occurring trace toxins can be every bit as undesirable as their counterparts derived from human pollution.  相似文献   

An in-depth look at the lunar crater Copernicus: Exposed mineralogy by high-resolution near-infrared spectroscopy     

Roberto Bugiolacchi  Urs Mall  Susan McKenna-Lawlor  Kjell Brønstad  Finn Søraas  Rolf B. Pedersen 《Icarus》2011,213(1):43-63

Newly acquired, sequentially spaced, high-resolution near-infrared spectra across the central section of crater Copernicus’ interior have been analyzed using a range of complementary techniques and indexes.We have developed a new interpretative method based on a multiple stage normalization process that appears to both confirm and expand on previous mineralogical estimations and mapping. In broad terms, the interpreted distribution of the principle mafic species suggests an overall composition of surface materials dominated by calcium-poor pyroxenes and minor olivine but with notable exceptions: the southern rim displays strong ca-rich pyroxene absorption features and five other locations, the uppermost northern crater wall, opposite rim sections facing the crater floor, and the central peak Pk1 and at the foot of Pk3, show instead strong olivine signatures.We also propose impact glass an alternative interpretation to the source of the weak but widespread olivine-like spectral signature found in low-reflectance samples, since it probably represents a major regolith constituent and component in large craters such as Copernicus.The high quality and performance of the SIR-2 data allows for the detection of diagnostic key mineral species even when investigating spectral samples with very subdued absorption features, confirming the intrinsic high-quality value of the returned data.  相似文献