Zoned finite strip method and its applications in geomechanics     

A. M. Oskoorouchi  B. Novrouzian

G. De Roeck  J. Van Den Broeck 《Computers and Geotechnics》1991,11(4):265-294

The technique of Finite Strip method has been extended for zoned strips. One strip can have several different materials in horizontal direction including dummy materials. The new developed zoned Finite Strip (Z.F.S.) method has many engineering applications, particularly in geomechanical problems. The formulation is presented and three different geotechnical problems have been solved using the new Z.F.S. method, which could not be solved by the original Finite Strip method. The results are compared with the solution for the same problems obtained by analytical and/or numerical (Finite Element) methods. The reduced input and output for the Z.F.S. method compared to the Finite Element method makes this method attractive particularly for practising engineers. However the results can be as good as the well known Finite Element method.  相似文献   

Evidence forr-process elements in HR 8911     

Piero Galeotti 《Astrophysics and Space Science》1974,31(1):193-201

The results of a spectral analysis of some high-dispersion plates of the peculiar star HR 8911 ( Piscium) are reported, and the observational evidence for somer-only elements in the atmosphere of this object is discussed.Many uranium lines were observed, so that the presence of this element may be considered certain. The presence of uranium and of some elements with mass number around theA195 peak gives strong evidence for anr-process mechanism which originated the elemental peculiarities in this object. The implications about the origin of peculiar stars are discussed on the ground of an explosive origin of ther-process elements observed in this star. Finally, the uncommon element holmium seems very likely to be present in the atmosphere of this peculiar star.  相似文献   

A NEW SPECIMEN OF THE MOUNT DOOLING IRON METEORITE FROM MOUNT MANNING,WESTERN AUSTRALIA     

J.R. De Laeter 《Meteoritics & planetary science》1980,15(2):149-155

A 701 kg iron meteorite has recently been discovered near the Mount Manning Range in Western Australia. The meteorite has a fan-shaped or delta wing configuration, one side being smooth and slightly concave with a well-defined fusion crust, whilst the other side is rough, convex and possesses numerous regmaglypts. It is probable that the meteorite pentrated much of the earth's atmosphere in an aerodynamically stable orientation, typical of the stalled attitude of delta wing aircraft. The meteorite is a member of Chemical Group 1C. A comparison of the chemical composition, surface features, microstructure and location of this meteorite with the Mount Dooling meteorite confirms that the find is a larger specimen of Mount Dooling. It is possible that other fragments of the Mount Dooling meteorite may be found in the Mount Manning Range region.  相似文献   

Blue straggler production in globular clusters     

Melvyn B. Davies  Giampaolo Piotto  Francesca De Angeli 《Monthly notices of the Royal Astronomical Society》2004,349(1):129-134

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Compact Groups of Galaxies: Evolution of the Stellar Population     

I. García De La Rosa  R. Coziol  R.R. De Carvalho  S. Zepf 《Astrophysics and Space Science》2001,276(2-4):717-723

We present a study focusing on the nature of compact groups (CGs) through the study of their elliptical (E) galaxies. Parameters describing the internal dynamics and the stellar populations of the galaxies are compared with their counterparts in other environments. Our sample has24 bright E galaxies located in the core of Hickson CGs and 11 bright ‘bona fide’ Es, located in the field or very loose groups. Their spectra were obtained with the 2.1 m Telescope at KPNO and have a 4.1 Å resolution over the wavelength range 3500–7000 Å. We have found that, from the dynamical point of view, E galaxies in CGs are essentially similar to those in dense clusters. Moreover, the stellar populations of Es in CGs seem to be older and less metal rich than those in the field, behaviour which has also been observed by Rose et al. (1994).  相似文献   

On the applicability of Goldberg and Unno's method to the determination of microturbulent velocities in an atmosphere with convection     

C. De Jager  L. Neven 《Solar physics》1972,22(1):49-52

The method of Goldberg and Unno for the determination of microturbulent velocities in a stellar atmosphere is only applicable if there are no macroturbulent or convective motions.If such motions occur, as in the solar photosphere, the derived results are false and may lead to misinterpretations such as an increase of the microturbulent velocity with depth or anisotropic microturbulence.  相似文献   

On the evolutionary time scale of the accreting component in massive close binaries     

C. Doom  J. P. De Grève 《Astrophysics and Space Science》1981,80(2):369-395

The remaining core hydrogen burning lifetime after mass exchange is computed for the mass gaining component in massive close binary systems. Results are obtained for various modes of mass accretion, for a wide range of initial masses and mass ratios, and for different values of mass loss from the system. The effect of mass loss by stellar wind is included. By use of general properties of massive close binary evolution, the position in time of four events is determined: the end of core hydrogen burning of the primary and the secondary, and the occurrence of the supernova of the primary and the secondary. It is found that the two supernova event occur rather close in time, compared to the Main Sequence time scales of the components.This research is supported by the National Foundation of Collective Fundamental Research of Belgium (FKFO) under No. 2.9009.79.  相似文献   

Statistics of apparent distances between QSO's and bright galaxies     

R. Kippenhahn  H. L. De Vries 《Astrophysics and Space Science》1974,26(1):131-135

Two experiments with points randomly distributed over the sky were carried out in order to check the significance of the apparent associations between bright galaxies and quasistellar objects found by Burbidgeet al. (1971). The experiments confirm the statistical relevance of these associations.  相似文献   

Solar radio spectra between 160 and 320 MHz     

T. De Groot 《Solar physics》1970,14(1):176-189

Dynamic spectra of incremental solar radio emission reveal that (mostly faint) pulsating and morphologically similar structures, including patterns of bright spots, dominate between ca. 250 and 320 MHz. As individual bursts these bright spots are similar to Type I bursts but they appear in an entirely different environment. This kind of activity is indicative of Type IV emission and seems to favour the generation of Type III bursts. Often its boundary with storm activity at the lower side of the band is rather sharp.  相似文献   

Note on solar hard X-ray bursts     

C. De Jager 《Solar physics》1967,2(3):347-350

Observationally solar X bursts fall into three different categories : soft X bursts (E < 10 keV), deka-keV bursts (10–150 keV), and very hard X bursts or deci-MeV bursts (200–1000 keV). The first kind is quasi-thermal, the last kind is non-thermal. The real existence of the third kind of burst looks probable but has not yet been proved by direct observations. The difference between deci-MeV and deka-keV bursts may mainly be a matter of geometry of the emitting plasma.  相似文献