Light curves of SN 1998A and comparison with similar unusual SNe     

Simon J. Woodings  rew J. Williams  Ralph Martin  Ronald R. Burman  & David G. Blair 《Monthly notices of the Royal Astronomical Society》1998,301(1):L5-L9

Following the proposal by Damineli that the central object of Eta Carinae may be an early-type binary, we perform numerical simulations of the X-ray emission from colliding stellar winds. A synthetic light curve has been generated which qualitatively agrees with the recent X-ray variability, and provides further support for the binary model. In particular, the model predicts a rise in the observed X-ray emission towards periastron, followed by a sharp drop and subsequent recovery. This is indeed what is seen in the RXTE light curve, although some problems concerning the X-ray spectrum at periastron still need to be explained. The simulations suggest that the width of the periastron dip will provide strong constraints on the binary and stellar wind properties of the components of Eta Car.  相似文献   

Albert Maucher in memoriam     

H.-J. Schneider  D. D. Klemm 《Mineralium Deposita》1981,16(2):191-193

  相似文献   

Compaction of Argillaceous Sediments (Developments in Sedimentology 16): H.H. Rieke III and G.V. Chilingarian. Elsevier, Amsterdam, 1974, 424 pp., Dfl. 85.00     

Ralph E. Grim 《Journal of Geochemical Exploration》1975,4(3):389-390

  相似文献   

The earthquake in the Swabian Jura of 16 November 1911 and present concepts of seismotectonics     

G. Schneider 《Tectonophysics》1979,53(3-4)

Beginning with the Swabian Jura earthquake in 1911 the seismic activity in Central Europe is concentrated to this area. A comparison with other events of the same epicentral region shows that the largest earthquake in Germany has the character of a left-lateral horizontal strike slip striking N — NNE. The focal parameters can be assumed within the following intervalls: Seismic moment M_o = 1…8·10¹⁷ Nm; focal area F_o = 18…53 km²; average dislocation d_o = 20…53 cm and stress drop Δp_o = 13…19 bar.  相似文献   

An aircraft study of turbulence dissipation rate and temperature structure function in the unstable marine atmospheric boundary layer     

C. W. Fairall  Ralph Markson  G. E. Schacher  K. L. Davidson 《Boundary-Layer Meteorology》1980,19(4):453-469

The dissipation rate of turbulent kinetic energy, , and the temperature structure function parameter, C _T ², have been measured over water from the near surface (Z = 3 m) to the top of the boundary layer. The near surface values of and C _T ² were used to calculate the velocity and temperature Monin-Obukhov scaling parameters u _* and T _*. The data collected during unstable lapse rates were used to evaluate the feasibility of extrapolating the values of and C _T ² as a function of height with empirical scaling formulae. The dissipation rate scaling formula of Wyngaard et al. (l971 a) gave a good fit to an average of the data for Z < 0.8 Z _i. In the surface layer the scaling formula of Wyngaard et al. (1971b) disagreed with the C _T ² values by as much as 50%. This disagreement is due to an unexpected reduction in the measured values of C _T ² forZ < 30 m. At this point it is not clear if the discrepancy is a unique property of the marine boundary layer or if it is simply some unknown instrumental or analytical problem. The mixed layer scaling results were similar to the overland results of Kaimal et al. (1976).  相似文献   

Book reviews     

S. I. Rasool  Charles Pereira F.R.S.  Stephen H. Schneider 《Climatic change》1980,3(1):105-110

  相似文献   

Depositional environments of some Pleistocene coastal terrace deposits,southwestern Oregon—case history of a progradational beach and dune sequence     

Ralph E. Hunter 《Sedimentary Geology》1980,27(4):241-262

Pleistocene coastal terrace deposits exposed in sea cliffs near Gold Beach, Oregon can be divided into four stratigraphic units: a basal gravelly unit and three overlying sandy units, each with mud beds, a paleosol, or the modern soil in its uppermost part. The gravelly unit consists of gravel and sand in its lower part, sand, in part pebbly or cobbly, in its middle part, and mud and sand in its upper part. Black sand and transported pieces of wood are common in the middle part of the unit, and wood is common in the mud. This unit is interpreted as a progradational deposit including environments ranging from lower forebeach at the base to backbeach flats and streams at the top.The main sandy parts of the sandy units are made up of a crossbedded sand facies, the dominant structure in which is medium-scale crossbedding, and an irregularly bedded sand facies, which is locally pebbly and is dominated by scour-and-fill structures. Deciding between shallow marine and eolian interpretations of the sandy units proved exceptionally difficult until modern analogues were found in the fine details of the internal structures. Largely on the basis of such structural details, the crossbedded sand facies is interpreted as the product of small eolian dunes, and the irregularly bedded sand facies is interpreted as deposits of interdune ephemeral streams, ephemeral ponds, and wet to dry subaerial flats. The mud beds and paleosols at the tops of the sandy units represent times of temporary stabilization of the dune field.  相似文献   

Letter to the Editor     

Ralph L. Seiler 《Ground water》1998,36(5):710-710

  相似文献   

X-Ray investigations on the deformation of experimentally shock-loaded quartzes     

H. Schneider  U. Hornemann 《Contributions to Mineralogy and Petrology》1976,55(2):205-215

Quartz single crystals submitted to dynamic pressures higher than 200 kbar show intensive anisotropic postshock cell expansions and lattice disordering which gradually increase along with the degree of shock compression. Maximum expansion and lattice distortion occur parallel to [10.0] followed by [21.0] and [20.1], whereas the lowest expansion rates and comparatively little lattice damage can be observed parallel to [10.2] and [00.1]. [10.0], [21.0], and [20.1] represent short Burgers vectors within the quartz lattice. They are probably preferred directions of a structure-controlled deformation.Annealing experiments carried out at 300, 605 and 900 ° C make the expanded cell parameters approach the values of unshocked quartz. Two different types of recrystallization can be observed:

1)	No contraction of the -constant but comparatively strong decrease of the c-parameter in samples shocked up to 260 kbar.
2)	A strong or complete recontraction of both cell parameters and c in highly shocked quartzes (260–300 kbar) if annealing to temperatures > 300 ° C.

  相似文献   

Design of Ground–Water Level Observation–Well Programs     

Ralph C. Heath 《Ground water》1976,14(2):71-77

  相似文献