Recent developments and goals in texture research of geological materials     

B. Leiss  K. Ullemeyer  K. Weber  H. G. Brokmeier  H. -J. Bunge  M. Drury  U. Faul  F. Fueten  A. Frischbutter  H. Klein  W. Kuhs  P. Launeau  G. E. Lloyd  D. J. Prior  Ch. Scheffzük  T. Weiss  K. Walther  H. -R. Wenk 《Journal of Structural Geology》2000,22(11-12)

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IRAS 12311−3509: a carbon star with SiC₂ emission     

T. Lloyd Evans  M. E. Hurst  P. J. Sarre 《Monthly notices of the Royal Astronomical Society》2000,319(1):111-120

The optical spectrum of the carbon star IRAS 12311−3509 is dominated by the Merrill–Sanford emission bands of SiC₂, by absorption and emission in the Swan system of C₂, and by resonance emission lines of neutral metals. The infrared energy distribution is flat from 1 to 60 μm. These observations are interpreted as arising from a star with a cool dusty disc which is edge-on to the observer and obscures direct starlight. The infrared continuum is caused predominantly by absorption of stellar light by dust in the disc and re-emission at longer wavelengths. The optical stellar spectrum is seen by reflection off dusty material which lies out of the plane of the disc, and the molecular and atomic emission arises in the same geometry through resonance fluorescence. The object has similarities to the J-silicate stars, but may have a carbon-rich rather than oxygen-rich disc. A full spectroscopic assignment and discussion of the SiC₂ bands and their intensities are given. Modelling of the rotational contours of the     band yields a rotational temperature of 250 K, indicating very cool gas.  相似文献   

ArcGIS to Unity: a design pipeline for creation of 3D terrain in serious egames for geology          下载免费PDF全文

Annabeth Robinson  Clare E. Gordon  Jacqueline Houghton  Geoffrey E. Lloyd  Daniel J. Morgan 《Geology Today》2015,31(6):237-240

One of the key challenges during the development of the Virtual World Project ‘egame environment’ discussed in this issue was the creation of the digital virtual landscape from an original 2002 base map of a field area. In this [online] paper we will walk through the design pipeline that was developed by the virtual worlds project team, and discuss some of the issues that were discovered when translating from a 2D map to a 3D environment using available software, for others interested in replicating this work.  相似文献   

Erratum to: Sediment identification using free fall penetrometer acceleration-time histories     

Gopal K. Mulukutla  Lloyd C. Huff  Jeffrey S. Melton  Kenneth C. Baldwin  Robert A. McConnaughey  Larry A. Mayer 《Marine Geophysical Researches》2011,32(3):413-413

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GESE: a small UV space telescope to conduct a large spectroscopic survey of z∼1 Galaxies     

Sara R. Heap  Qian Gong  Tony Hull  Jeffrey Kruk  Lloyd Purves 《Astrophysics and Space Science》2014,354(1):211-214

One of the key goals of NASA’s astrophysics program is to answer the question: How did galaxies evolve into the spirals and elliptical galaxies that we see today? We describe a space mission concept called Galaxy Evolution Spectroscopic Explorer (GESE) to address this question by making a large spectroscopic survey of galaxies at a redshift, z～1 (look-back time of ～8 billion years). GESE is a 1.5-m space telescope with an ultraviolet (UV) multi-object slit spectrograph that can obtain spectra of hundreds of galaxies per exposure. The spectrograph covers the spectral range, 0.2–0.4 μm at a spectral resolving power, R～500. This observed spectral range corresponds to 0.1–0.2 μm as emitted by a galaxy at a redshift, z=1. The mission concept takes advantage of two new technological advances: (1) light-weighted, wide-field telescope mirrors, and (2) the Next-Generation MicroShutter Array (NG-MSA) to be used as a slit generator in the multi-object slit spectrograph.  相似文献   

The eccentric double-lined binary BD — 1° 1004     

N. Kameswara Rao  B. N. Ashoka  C. Lloyd  C. D. Pike  D. J. Stickland 《Journal of Astrophysics and Astronomy》1990,11(4):445-460

A new radial velocity study has been made of the highly eccentric, early-type binary BD -1° 1004 using spectra from the Kavalur Observatory. All available archival material has also been reexamined. An attempt has been made to correct for line ‘dragging’ by the secondary spectrum to improve the fit of the observed data to the orbital solutions. It is found that an earlier suggestion of apsidal regression is still possible although ω is probably constant within the errors. There remain problems and inconsistencies with other orbital elements, in particular K₁ and γ  相似文献   

The high-energy polarization-limiting radius of neutron star magnetospheres – I. Slowly rotating neutron stars     

Jeremy S. Heyl †  Nir J. Shaviv ‡  Don Lloyd 《Monthly notices of the Royal Astronomical Society》2003,342(1):134-144

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A Balloon Experiment to detect Microorganisms in the Outer Space     

J.V. Narlikar  D. Lloyd  N.C. Wickramasinghe  M.J. Harris  M.P. Turner  S. Al-Mufti  M.K. Wallis  M. Wainwright  P. Rajaratnam  S. Shivaji  G.S.N. Reddy  S. Ramadurai  F. Hoyle 《Astrophysics and Space Science》2003,285(2):555-562

The results of biological studies of a cryosampler flown with a balloon, in which air samples were collected at altitudes ranging from 20 to 41 km, well above the Tropopause over Hyderabad, are described. In the analysis carried out in Cardiff, voltage-sensitive dyes that could detect the presence of viable cells were used on these air-samples. Clumps of viable cells were found to be present in samples collected at all the altitudes. The images obtained from electron microscopy are consistent with the above finding. Reference is also made to another paper presented at this conference describing the identification of bacterial species in the sample carried out in Sheffield. Counter arguments are discussed against the criticism that the detected cells and microorganisms (in the samples collected above the local tropopause at 16 km) are due to terrestrial contamination. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献   

Estimation of areal specific yield in sands using the central limit theorem     

Stephen B. K. Tan  E. B. Shuy  Lloyd H. C. Chua  Ngonidzashe Mzila 《水文研究》2006,20(18):3975-3987

A new approach is demonstrated that permits a reliable estimate of specific yield using published values of the van Genuchten water retention parameters and effective grain sizes and the measured effective grain sizes of soil samples. The specific yield distribution of the soil texture was computed using the published values of the van Genuchten parameters. The specific yield values and the published values of effective grain sizes were then used to construct a specific yield–effective grain size curve, which estimates the ‘point’ specific yield of the soil samples. Applying the central limit theorem, the point specific yields could be transformed into an ‘areal’ specific yield for a study area. Compared with other commonly used approaches, the present procedure requires relatively low computational efforts and readily obtainable data. It is cost effective and does not depend on soil texture classification. More importantly, it incorporates the depth to water table and the variations in grain sizes inherent in natural soil conditions in the estimation. The approach developed was applied for estimating the specific yield of an unconfined sandy aquifer created by land reclamation in the equatorial region. The values obtained were compared with field measurements and the typical ranges of specific yield from the literature. Instead of a single estimate of the specific yield, the method yields a confidence interval with a high confidence level of 95% and with a narrower range than the typical ranges from the literature. In addition, the estimated values are close to the field measurements; hence, the procedure provides a cost‐effective alternative to field measurement. The applicability of the present approach could be extended to sites with heterogeneity in the horizontal direction. Nevertheless, the applicability of the present approach for layered soil profiles requires further evaluations. Copyright © 2006 John Wiley & Sons, Ltd.  相似文献   

The calibrating stars of the Mira P–L relation     

I. S. Glass  T. Lloyd Evans 《Monthly notices of the Royal Astronomical Society》2003,343(1):67-74

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