A Field Evaluation of In-Situ Biodegradation of Chlorinated Ethenes: Part 2, Results of Biostimulation and Biotransformation Experiments   总被引：2，自引：0，他引：2  

Lewis Semprini  Paul V. Roberts  Gary D. Hopkins  Perry L. McCarty 《Ground water》1990,28(5):715-727

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The treatment of atmospheric dispersion data in the presence of noise and baseline drift     

D. M. Lewis  P. C. Chatwin 《Boundary-Layer Meteorology》1995,72(1-2):53-85

Recently large quantities of data from many different field experiments have become available to facilitate the examination of various proposed models of atmospheric dispersion. However, these data sets are invariably corrupted by some form of random noise and, also, significant baseline drift is often recorded. Consequently, these problems require careful consideration and treatment before the data can be used in model testing. In many papers, the noise is simply treated by thresholding but this is unacceptable since many valid readings are discarded. This paper examines the performance of two different noise removal methods that are more soundly based, both physically and mathematically. The first is a Wiener filter with certain modifications, and the second is a maximum entropy inversion technique. A comparison of the results of applying these methods is presented, with the emphasis on the practical treatment of the numerical and computational problems that arise. The problem of baseline drift is treated initially by applying a number of subjective fits. Subsequently the noise removal methods are applied. In general, it is found that the maximum entropy method performs better than the Wiener filter for the data sets examined here.  相似文献   

Ageing research in Australia: reflecting on Graeme Hugo’s four decades of contribution     

Debbie Faulkner  Helen Barrie Feist  Judith Lewis 《The Australian geographer》2016,47(4):399-415

ABSTRACT

Globally, population ageing is one of the most pressing social and policy issues faced today. Over the next two decades, Australian society will face dramatic increases in the proportion of the population aged 65 years and over, as the baby boomers move into older age and fertility levels remain low. Yet population ageing is not a surprising or new trend—demographic changes in the age profile of a population tend to occur incrementally rather than suddenly. As a demographer and geographer, Graeme Hugo drew attention to this trend in Australia’s population more than three decades ago. Throughout Graeme Hugo’s vast breadth of work over the past 40 years, there has been a consistent thread of demographic analysis and academic thought associated with the ageing of Australia’s population. This paper focuses on Hugo’s contributions to academic thought and policy on Australia’s ageing population and the challenges associated with this for both service delivery and health policy as Australian society moves into an unprecedented era of population ageing.  相似文献   

An efficient artificial intelligence model for prediction of tropical storm surge   总被引：1，自引：0，他引：1  

M. Reza Hashemi  Malcolm L. Spaulding  Alex Shaw  Hamed Farhadi  Matt Lewis 《Natural Hazards》2016,80(1):471-486

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Rapid,high-resolution detection of environmental change over continental scales from satellite data – the Earth Observation Data Cube     

Adam Lewis  Leo Lymburner  Matthew B. J. Purss  Brendan Brooke  Ben Evans  Alex Ip 《International Journal of Digital Earth》2016,9(1):106-111

The effort and cost required to convert satellite Earth Observation (EO) data into meaningful geophysical variables has prevented the systematic analysis of all available observations. To overcome these problems, we utilise an integrated High Performance Computing and Data environment to rapidly process, restructure and analyse the Australian Landsat data archive. In this approach, the EO data are assigned to a common grid framework that spans the full geospatial and temporal extent of the observations – the EO Data Cube. This approach is pixel-based and incorporates geometric and spectral calibration and quality assurance of each Earth surface reflectance measurement. We demonstrate the utility of the approach with rapid time-series mapping of surface water across the entire Australian continent using 27 years of continuous, 25?m resolution observations. Our preliminary analysis of the Landsat archive shows how the EO Data Cube can effectively liberate high-resolution EO data from their complex sensor-specific data structures and revolutionise our ability to measure environmental change.  相似文献   

The shape of impacts to come: lessons and opportunities for adaptation from uneven increases in global and regional temperatures     

Kristie L. Ebi  Lewis H. Ziska  Gary W. Yohe 《Climatic change》2016,139(3-4):341-349

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The continental terrace     

K.B. Lewis 《Earth》1974,10(1):37-71

The continental terrace, defined as the sediment and rock underlying the coastal plain, the continental shelf and continental slope, has been extensively explored during the last decade using seismic techniques. Some facts and theories about its structure and formation are reviewed.The development of the continental terrace is considered in three main stages: first, the formation of the major discontinuity between continent and ocean basin; second, the deposition of sedimentary strata; and third, the Quaternary modification of the continental terrace to form the present topography.The major discontinuity may be formed either by rifting of a continent or by accretion of a large mass of contorted continental terrace and continental rise sediments to a pre-existing edge of a continent. Both types of discontinuity may be either ancient or presently forming in an orogenic area. Sedimentary strata are built generally upwards and outwards but at most places development is modified either by basement structure, by current and slump erosion or by growth of organic and diapiric structures.During the Quaternary Era the terrace has been extensively modified as a result of large fluctuations of sea level. The present wide continental shelf and deep shelf break are at most places the result of wave planation and offshore deposition during the last low sea level and during the subsequent rise of sea level. The final process at many places has been formation of a Holocene coastal plain and deposition of a prism of sediment on the inner continental shelf.Most continental terraces show evidence of continental flexure, which is the seaward tilting of land and seabed with a zero isobase, a line of no vertical movement, close to the shore. The reasons for continental flexure are discussed. The relative positions of the shore line, the zero isobase and the boundary between erosion and deposition are controlled by rates of tilting, by rates of sedimentary processes and by eustatic movements of sea level.From an assessment of the general processes operating today, some conclusions are reached about the changes in form and topography of continental terraces of the past.  相似文献   

Vector magnetic fields in sunspots     

Joseph B. Gurman  Lewis L. House 《Solar physics》1981,71(1):5-20

Observations of a round, unipolar sunspot in the Zeeman triplet Fe i 6302.5 with the High Altitude Observatory Stokes Polarimeter are used to derive the vector magnetic field in the spot. The behavior of the magnitude, inclination, and azimuth of the field vector B across the spot is discussed. A linear relation is found between the continuum intensity I _c and the field magnitude B. Time series obtained in the umbra show significant power in the magnitude of the field at a period of t 180 s but the other components of the field vector do not display this behavior.The National Center for Atmospheric Research is sponsored by the National Science Foundation.  相似文献   

Excursion to St. Leonards: Saturday,May 21st, 1921     

W.J. Lewis Abbott 《Proceedings of the Geologists' Association. Geologists' Association》1921,32(4):226-IN3

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Notes on some pleistocene sections in and near London     

W.J. Lewis Abbott 《Proceedings of the Geologists' Association. Geologists' Association》1890,11(8):473-480

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