Spectroscopy of CN Orionis     

K. H. Mantel  H. Barwig  R. Haefner  R. Schoembs 《Astrophysics and Space Science》1987,131(1-2):501-505

Two outbursts and a minimum phase of the dwarf nova CN Orionis have been observed spectroscopically. One outburst was covered almost completely. The outburst spectra show periodic variations of the absorption lines which are interpreted with the formation of an elliptic disc during outburst stage. During decline from outburst a narrow emission line appears in the core of the broad H absorption line. The balmer decrement in the outburst phase is much steeper than in the minimum phase. This implies that during the outburst the emission line region is located more outward in the disk. The semi amplitude of the radial velocity curve was determined to K1=152 km/s±10 km/s. Using the photometric orbital period and an assumption about the inclination angle the approximate system parameters could be derived.Based on observations colleted at the European Southern Observatory, La Silla, Chile and at Mount Stromlo Observatory, Canberra, Australia.Paper presented at the IAU Colloquium No. 93 on Cataclysmic Variables. Recent Multi-Frequency Observations and Theoretical Developments, held at Dr. Remeis-Sternwarte Bamberg, F.R.G., 16–19 June, 1986.  相似文献   

Effects of benzene and dimethylnaphthalene on homeostatic processes in two species of crabs     

Linda H. Mantel  Edward Flynn  Mary Katz  Liza Knapp 《Marine environmental research》1985,17(2-4)

Long-term exposure of animals to sub-lethal doses of toxicants such as benzene (B) and dimethylnaphthalene (DMN) may result in subtle changes in their physiology and biochemistry. In crustaceans such changes include decreased rate of limb regeneration, extended time to molt and decreased growth increment at molt.^1,2 These processes depend upon an adequate supply of stored nutrients in the tissues and appropriate release of neuroendocrine substances from the central nervous system.^3,4 We are examining the effects of sub-lethal doses of B and DMN on osmotic and ionic regulation and on nutrient storage in the blue crab, Callinectes sapidus, and the green crab, Carcinus maenas. Disturbances in these physiological processes may reflect alterations in neuroendocrine functions brought about by the presence of toxicants. We find that exposure of C. maenas to B or DMN, followed by transfer to a dilute medium, results in impaired osmoregulatory capacity, while addition of these compounds to a dilute medium to which the animal is already acclimated does not affect their regulatory ability. Storage of carbohydrate in the midgut gland (hepatopancreas) is decreased by B or DMN, while the accessory storage tissues (gill, muscle) are not significantly affected.  相似文献   

Le Dosage Du Carbone Particulaire Dans L'Eau De Mer Et Son Application Dans Le Golfe Du Lion     

Szekielda  Karl-Heinz 《ICES Journal of Marine Science》1969,32(3):318-343

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Upwelling Studies With Satellites     

Szekielda  Karl-Heinz 《ICES Journal of Marine Science》1972,34(3):379-388

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Pattern recognition of suspended material     

Szekielda  Karl-Heinz; Duvall  James T. 《ICES Journal of Marine Science》1976,36(3):205-216

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Why chromatic imaging matters     

Joel Sanchez-Bermudez  Florentin Millour  Fabien Baron  Roy van Boekel  Laurent Bourgès  Gilles Duvert  Paulo J. V. Garcia  Nuno Gomes  Karl-Heinz Hofmann  Thomas Henning  Jacob W. Isbell  Bruno Lopez  Alexis Matter  J-Uwe Pott  Dieter Schertl  Eric Thiébaut  Gerd Weigelt  John Young 《Experimental Astronomy》2018,46(3):457-473

During the last two decades, the first generation of beam combiners at the Very Large Telescope Interferometer has proved the importance of optical interferometry for high-angular resolution astrophysical studies in the near- and mid-infrared. With the advent of 4-beam combiners at the VLTI, the u ? v coverage per pointing increases significantly, providing an opportunity to use reconstructed images as powerful scientific tools. Therefore, interferometric imaging is already a key feature of the new generation of VLTI instruments, as well as for other interferometric facilities like CHARA and JWST. It is thus imperative to account for the current image reconstruction capabilities and their expected evolutions in the coming years. Here, we present a general overview of the current situation of optical interferometric image reconstruction with a focus on new wavelength-dependent information, highlighting its main advantages and limitations. As an Appendix we include several cookbooks describing the usage and installation of several state-of-the art image reconstruction packages. To illustrate the current capabilities of the software available to the community, we recovered chromatic images, from simulated MATISSE data, using the MCMC software SQUEEZE. With these images, we aim at showing the importance of selecting good regularization functions and their impact on the reconstruction.  相似文献   

Characteristics of a planar rock slide: Hamersley range, Western Australia     

Karl-Heinz Wyrwoll 《Engineering Geology》1986,22(4):335-348

A large planar rock slide in the Hamersley Range, Western Australia, is described and analysed for possible causes of failure. The general characteristics of the slide are determined by the major joint sets. The rock mass consists predominantly of alternating massive chert members and argillaceous horizons—giving the rock mass a distinctive flaggy appearance. The failure plane dips at 17° and is coincident with a shale horizon. Because of the low inclination of the failure plane factors of safety less than one cannot be obtained from limiting-equilibrium hindcast estimates, unless high joint-water pressures and/or seismic loading are invoked. But while the operation of these two factors cannot be totally ruled out, the field evidence suggests that the necessary conditions for failure were due to the weathering out of shale horizons which could have led to “adjustments” of the rock mass, giving rise to dynamic loading conditions along potential failure planes.  相似文献   

The Holocene paleohydrology and climatic history of the northern great sandy desert - fitzroy trough: With special reference to the history of the northwest Australian monsoon     

Karl-Heinz Wyrwoll  Jennifer Hopwood  N. L. McKenzie 《Climatic change》1992,22(1):47-65

The Holocene history of the northwest Australian monsoon is considered in the light of new stratigraphic findings from the southern margin of the monsoon regime. A discussion of the present-day climatology of northwestern Australia and synoptic controls on precipitation in the areas at the southern margin of the monsoon regime is given as background information for the interpretation of stratigraphic findings from swamp and alluvial sequences. The stratigraphic findings point to little change in the intensity of the northwest Australian monsoon since ca. 6.5 ka. A more tentative inference drawn from the field evidence is that the monsoon activity may well have been reduced in this region during the Early Holocene; during this time insolation levels were also reduced. The possible relationship of the northwest Australian monsoon to insolation levels is explored. It is clear that monsoon behavior cannot be accounted for as a simple linear response of monsoon intensity to variations in insolation. Possible controls are discussed with particular emphasis on the plausibility of changes in the damping of convective motions providing the mechanism. Gill's model of heat-induced circulation is used to provide some evidence in favour of this conjecture.  相似文献   

Anticyclonic and cyclonic eddies near the Somali Coast     

Dr. Karl-Heinz Szekielda 《Ocean Dynamics》1971,24(1):26-29

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Modellrechnungen für die freigesetzte Energie bei der Oxydation organischen Materials im Seewasser     

Karl-Heinz Szekielda 《Ocean Dynamics》1967,20(6):265-269

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