Cooling of the quasi-persistent neutron star X-ray transients KS 1731−260 and MXB 1659−29     

Edward M. Cackett  Rudy Wijnands  Manuel Linares  Jon M. Miller  Jeroen Homan  Walter H. G. Lewin 《Monthly notices of the Royal Astronomical Society》2006,372(1):479-488

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The effect of large-scale structure on the SDSS galaxy three-point correlation function     

R. C. Nichol  R. K. Sheth  Y. Suto  A. J. Gray  I. Kayo  R. H. Wechsler †  F. Marin  G. Kulkarni  M. Blanton  A. J. Connolly  J. P. Gardner  B. Jain  C. J. Miller  A. W. Moore  A. Pope  J. Pun  D. Schneider  J. Schneider  A. Szalay  I. Szapudi  I. Zehavi  N. A. Bahcall  I. Csabai  J. Brinkmann 《Monthly notices of the Royal Astronomical Society》2006,368(4):1507-1514

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CILIMUS: A NEW CHONDRITE FALL     

Joy Miller  J. Nelen  K. Fredriksson  S. Darsoprajitno  S. Padmanagara 《Meteoritics & planetary science》1981,16(1):69-76

Cilimus is a new Indonesian chondrite. Its mineralogy and chemistry categorize it as a veined, intermediate-to-white hypersthene or L-5 chondrite. Black veins and impact-produced glasses including maskelynite show evidence that Cilimus has been severely shocked.  相似文献   

Breccias resembling melt bombs from the Roter Kamm Crater     

J. J. Degenhardt  R. McG. Miller  W. U. Reimold  A. M. Reid 《Meteoritics & planetary science》1996,31(3):413-415

Abstract Irregular, dark green to black, glassy-looking boulders are locally common in the northwest portion of the rim of the Roter Kamm impact crater in southern Namibia. Their smooth surfaces, flow-like textures, presence of folds, and their similarity to melt bombs have led to the interpretation that these are molten impact ejecta. However, the samples we have examined are all fine-grained breccias composed of angular fragments that show no evidence of melting. Meltlike surface textures of these rim breccias are largely a consequence of surface wind polishing of fine-grained rocks in a desert environment. These mono-mict breccias were produced by impact-related brecciation of Gariep sediments (carbonaceous, siliceous shales) previously modified by low-grade Damaran metamorphism. Secondary quartz within the breccias is attributed to fluid activity that postdates the impact.  相似文献   

Subsurface flow responses of a small forested catchment in the Ouachita mountains     

Donald J. Turton  Charles T. Haan  Edwin L. Miller 《水文研究》1992,6(1):111-125

Despite considerable research performed on forested catchments in the Ouachita Mountains of Oklahoma and Arkansas, little information on hydrological processes in operation is available. Based on catchment physical characteristics, subsurface flow was thought to be an important hydrological process in the region. Therefore, this study was undertaken to determine the occurrence, rates, timing and volumes of subsurface flow, and to estimate the importance of subsurface flow as a streamflow generating process. Subsurface flow was collected from three hillslope sites on a 7.7 ha forested catchment. Hillslope sites drained through natural seepage faces located near stream channels. Subsurface flow was collected from three depths at each hillslope site, below the litter layer, below the a horizon, and within the B horizon (Bt21). Subsurface flow occurred and was measured during 11 of 31 rainfall events. Subsurface flow responded rapidly to the initiation of and to changes in intensity of rainfall at all depths. the rapid response was indicative of flow through soil macropores. B horizon subsurface flow commenced within 10 to 180 min of the initiation of rainfall. Multiple linear regression showed that the volume of subsurface flow generated during a given storm was directly related to rainfall depth and a 7-day antecedent precipitation index used to represent antecedent water content. About 67 per cent of the total subsurface flow collected during the study was produced in one large storm under wet antecedent conditions. the storm was equal to the 2-year, 24-hour storm for the region. Measured subsurface flow volumes were extended to the watershed scale to provide estimates of catchment-wide contributions to streamflow. It was estimated that subsurface flow contributed from 1 to 48 per cent of total quickflow measured at the catchment outlet. Based on the timing of subsurface flow, it was estimated that subsurface flow May, contribute up to 70 per cent of quickflow before and soon after peak flow.  相似文献   

The 2QZ BL Lac survey     

D. Londish  S. M. Croom  B. J. Boyle  T. Shanks  P. J. Outram  E. M. Sadler  N. S. Loaring  R. J. Smith  L. Miller  P. F. L. Maxted 《Monthly notices of the Royal Astronomical Society》2002,334(4):941-957

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The 2dF QSO Redshift Survey – II. Structure and evolution at high redshift     

Scott M. Croom  T. Shanks  B.J. Boyle  R.J. Smith  L. Miller  N.S. Loaring  F. Hoyle 《Monthly notices of the Royal Astronomical Society》2001,325(2):483-496

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Cumulenic and heterocumulenic anions: potential interstellar species?     

Stephen J. Blanksby  rew M. McAnoy  Suresh Dua  John H. Bowie 《Monthly notices of the Royal Astronomical Society》2001,328(1):89-100

A recent theoretical investigation by Terzieva & Herbst of linear carbon chains, C _n where n  ≥ 6, in the interstellar medium has shown that these species can undergo efficient radiative association to form the corresponding anions. An experimental study by Barckholtz, Snow & Bierbaum of these anions has demonstrated that they do not react efficiently with molecular hydrogen, leading to the possibility of detectable abundances of cumulene-type anions in dense interstellar and circumstellar environments. Here we present a series of electronic structure calculations which examine possible anionic candidates for detection in these media, namely the anion analogues of the previously identified interstellar cumulenes C _n H and C _{n −1}CH₂ and heterocumulenes C _n O (where n  = 2–10). The extraordinary electron affinities calculated for these molecules suggest that efficient radiative electron attachment could occur, and the large dipole moments of these simple (generally) linear molecules point to the possibility of detection by radio astronomy.  相似文献   

Ar-Ar age of mylonites along the Merens Fault, central Pyrenees     

A.M. McCaig  J.A. Miller 《Tectonophysics》1986,129(1-4)

Seven mylonitic samples and two coarse muscovites from the central Pyrenees have been dated by the ⁴⁰Ar-³⁹Ar method. Whole rock specimens of mylonite were cut out of thin-section chips allowing complete characterisation of mineralogy and texture. Several specimens showed rising staircase patterns in the range 50–90 Ma, with much higher ages in the highest temperature steps. This is believed to reflect mixing of argon released from micas with excess argon contained in plagioclase and released mainly at high temperatures. One biotite-quartz mylonite gave a plateau age of 93 ± 2 Ma. Other inferred mica ages are about 60–73 Ma for biotite and 50–60 Ma for muscovite; it is probable that biotite contains excess argon and that 50 Ma approximates to the cooling age in the mylonites. One coarse muscovite collected immediately below the major Mérens shear zone gave a Hercynian plateau age, while another collected within the Mérens zone gave a partially reset Hercynian age.Taken together, the data indicate that the shear zones were active in Alpine times < 100 Ma and probably about 50 Ma ago. They are believed to have formed during the early stages of Eocene compression in the Pyrenees. Deformation and resultant uplift probably terminated an important thermal event in this part of the Pyrenean basement, which may have begun at the time of the mid-Cretaceous North Pyrenean metamorphism (90–100 Ma).  相似文献   

Paleohydrological implications of Holocene peatland development in northern Michigan     

Norton G. Miller  Richard P. Futyma   《Quaternary Research》1987,27(3)

Sediment, pollen, and plant macrofossil stratigraphies from two small oligotrophic Chamaedaphne-Sphagnum peatlands provide data about local hydrologic changes in northern Michigan during the Holocene. Gleason Bog started about 8000 yr B.P. as a shallow pond that supported rich fen vegetation. After it was partly filled with peat and sand (about 4000 yr B.P.), the vegetation changed to oligotrophic bog. At Gates Bog paludification starting about 3800 yr B.P. caused peat accumulation over sand without an initial pond phase. The onset of peat accumulation at both sites is attributed to a rise in the water table resulting from the onset of cool and moist late Holocene climates. The water table of Gleason Bog is linked to the water level of adjacent Douglas Lake, which may have undergone a simultaneous rise. The results emphasize the individuality of hydrological conditions and hydroseral development in northern Michigan peatlands.  相似文献