On post-glacial sea level – II. Numerical formulation and comparative results on spherically symmetric models     

Roblyn A. Kendall  Jerry X. Mitrovica  Glenn A. Milne 《Geophysical Journal International》2005,161(3):679-706

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Upper-mantle seismic structure in a region of incipient continental breakup: northern Ethiopian rift   总被引：4，自引：0，他引：4  

Ian D. Bastow  Graham W. Stuart  J-Michael Kendall  Cynthia J. Ebinger 《Geophysical Journal International》2005,162(2):479-493

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The measurement of minor stratospheric constituent concentrations by far infra‐red emission spectroscopy     

T.A. Clark  D.J.W. Kendall 《大气与海洋》2013,51(3):155-165

Far infra‐red stratospheric emission spectra recorded with a Michelson interferometer on board the AES balloon gondola during the 22–23 July 1974 flight from Churchill, Manitoba, are discussed and integrated column densities of H₂O and O₃ derived for an altitude of 22 km. The possibility of detection of other constituents by present and future instrumentation is assessed.  相似文献   

Active galactic nuclei and the minor merger hypothesis     

Philip Kendall  John Magorrian  J. E. Pringle 《Monthly notices of the Royal Astronomical Society》2003,346(4):1078-1088

We have investigated the dynamics of the merging process in the minor merger hypothesis for active galactic nuclei. We find that for a satellite galaxy to be able to merge directly with the nucleus of the host galaxy (for example, to give rise to the compact dust discs which are seen in early-type active galaxies), the initial orbit of the satellite is required to be well aimed. For the case of the host galaxy being a disc galaxy, if the initial orbits of the satellites are randomly oriented with respect to the host galaxy, then the orbits of those which reach the host nuclear regions in a reasonable time are also fairly randomly oriented once they reach the nucleus. We note that this result might be able to provide an explanation of why the jet directions in the nuclei of Seyfert galaxies are apparently unrelated to the plane of the galaxy discs.  相似文献   

Computation of the Solution of Geomagnetic Induction Problems: a General Method, with Applications     

V. C. L. Hutson  P. C. Kendall  S. R. C. Malin 《Geophysical Journal International》1972,28(5):489-498

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Indoor Air Background Levels of Volatile Organic Compounds and Air-Phase Petroleum Hydrocarbons in Office Buildings and Schools     

Richard Rago BS  Andy Rezendes BS  Jay Peters MS  Kelly Chatterton BS  Arun Kammari MS 《Ground Water Monitoring & Remediation》2021,41(2):27-47

A background indoor air study has been completed which includes the collection of indoor air samples from office buildings and schools. The anonymous study was designed with input from the U.S. Environmental Protection Agency and the Massachusetts Department of Environmental Protection. The sampling was implemented in 2013, 2014, and 2015 and included the collection of 25 school building samples and 61 office building samples. The study generated 14,668 new indoor air background data points, with samples collected from buildings located in 26 cities in 18 states, including Arizona, California, Connecticut, Indiana, Kansas, Maine, Massachusetts, Minnesota, Montana, New Hampshire, New Jersey, New York, Nevada, North Carolina, Ohio, Texas, Utah, and Washington. Indoor air background concentrations of target compound volatile organic compounds (VOCs) ranged from less than the laboratory method reporting limit of 0.044 μg/m³ to concentrations up to 1190 μg/m³, with hydrocarbon ranges from less than the reporting method limit of 10 μg/m³ to concentrations up to 3000 μg/m³. Some VOCs were identified ubiquitously in indoor air background, and some were identified at concentrations which exceeded risk-based regulatory screening levels. These study results provide useful and updated information on indoor air background and air quality in offices and schools and can be used in future regulatory guidance update considerations, for further examination of relationships between these data and residential study data, in human health risk assessments and risk communication, and in planning future studies.  相似文献   

Tracing spiral density waves in M81     

S. Kendall  R. C. Kennicutt  C. Clarke  M. D. Thornley 《Monthly notices of the Royal Astronomical Society》2008,387(3):1007-1020

We use Spitzer IRAC 3.6 and 4.5 μm near-infrared data from the Spitzer Infrared Nearby Galaxies Survey (SINGS), optical B, V and I and Two-Micron All-Sky Survey K _s-band data to produce mass surface density maps of M81. The IRAC 3.6- and 4.5-μm data, whilst dominated by emission from old stellar populations, are corrected for small-scale contamination by young stars and polycyclic aromatic hydrocarbon emission. The I -band data are used to produce a mass surface density map by a   B − V   colour correction, following the method of Bell and de Jong. We fit a bulge and exponential disc to each mass map, and subtract these components to reveal the non-axisymmetric mass surface density. From the residual mass maps, we are able to extract the amplitude and phase of the density wave, using azimuthal profiles. The response of the gas is observed via dust emission in the 8-μm IRAC band, allowing a comparison between the phase of the stellar density wave and gas shock. The relationship between this angular offset and radius suggests that the spiral structure is reasonably long-lived and allows the position of corotation to be determined.  相似文献   

Integrated Reservoir Management for the Long Term-The Carpinteria Offshore Field     

E. M. Whitney  R. P. Kendall  M. R. Brickey  S. E. Coombs  C. A. Duda  V. K. Duda 《Marine Georesources & Geotechnology》2013,31(2-3):103-116

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Incidence of marine debris and its relationships with benthic features in Gray's Reef National Marine Sanctuary, Southeast USA     

Bauer LJ  Kendall MS  Jeffrey CF 《Marine pollution bulletin》2008,56(3):402-413

Gray's Reef National Marine Sanctuary (GRNMS) is an increasingly popular site for recreational fishing and diving in the South Atlantic Bight (SAB). As a result, there has been heightened concern about potential accumulation of marine debris and its consequent effects on sanctuary resources. Field surveys were conducted at GRNMS in 2004 and 2005 to provide a spatially comprehensive characterization of benthic communities and to quantify the distribution and abundance of marine debris in relation to bottom features. The spatial distribution of debris was concentrated in the center of the sanctuary and was most frequently associated with ledges rather than other bottom types. On ledges, the presence and abundance of debris was significantly related to observed boating activity and physiographic features including ledge height, ledge area, and percent cover of benthic organisms. The results from this study will aid managers in optimizing cleanup efforts and long-term monitoring of debris accumulation patterns at GRNMS and other hard bottom areas in the SAB.  相似文献   

Reef margin collapse, gully formation and filling within the Permian Capitan Reef: Carlsbad Caverns, New Mexico, USA     

Gill M. Harwood  & Alan C. Kendall 《Sedimentology》1999,46(3):443-461

An area of reef margin collapse, gully formation and gully fill sedimentation has been identified and mapped within Left Hand Tunnel, Carlsbad Caverns. It demonstrates that the Capitan Reef did not, at all times, form an unbroken border to the Delaware Basin. Geopetally arranged sediments within cavities from sponge–algal framestones of the reef show that the in situ reef today has a 10° basinwards structural dip. Similar dips in adjacent back-reef sediments, previously considered depositional, probably also have a structural origin. Reoriented geopetal structures have also allowed the identification of a 200-m-wide, 25-m-deep gully within the reef, which has been filled by large (some  >15 m), randomly orientated and, in places, overturned blocks and boulders, surrounded by finer reef rubble, breccias and grainstones. Block supply continued throughout gully filling, implying that spalling of reef blocks was a longer term process and was not a by-product of the formation of the gully. Gully initiation was probably the result of a reef front collapse, with a continued instability of the gully bordering reef facies demonstrated by their incipient brecciation and by faults containing synsedimentary fills. Gully filling probably occurred during reef growth, and younger reef has prograded over the gully fill. Blocks contain truncated former aragonite botryoidal cements, indicating early aragonite growth within the in situ reef. In contrast, former high-magnesian calcite rind cements post-date sedimentation within the gully. The morphology of cavern passages is controlled by reef facies variation, with narrower passages cut into the in situ reef and wider passages within the gully fill. Gully fills may also constitute more permeable zones in the subsurface.  相似文献