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  • 1
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    Calibration and validation of reservoir models: the importance of high resolution, quantitative outcrop analogues (2010)
    The Geological Society of London
    Details
    Publication Date: 2021-11-09
    Description: Rapidly developing methods of digital acquisition, visualization and analysis allow highly detailed outcrop models to be constructed, and used as analogues to provide quantitative information about sedimentological and structural architectures from reservoir to subseismic scales of observation. Terrestrial laser-scanning (lidar) and high precision Real-Time Kinematic GPS are key survey technologies for data acquisition. 3D visualization facilities are used when analysing the outcrop data. Analysis of laser-scan data involves picking of the point-cloud to derive interpolated stratigraphic and structural surfaces. The resultant data can be used as input for object-based models, or can be cellularized and upscaled for use in grid-based reservoir modelling. Outcrop data can also be used to calibrate numerical models of geological processes such as the development and growth of folds, and the initiation and propagation of fractures.
    Description: Published
    Description: 87–98
    Description: 3.3. Geodinamica e struttura dell'interno della Terra
    Description: N/A or not JCR
    Description: reserved
    Keywords: Laser-Scanning ; Outcrop analogues ; Reservoirs ; 04. Solid Earth::04.04. Geology::04.04.09. Structural geology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
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    Quantification of fold curvature and fracturing using terrestrial laser scanning (2012)
    Details
    Publication Date: 2021-11-09
    Description: Terrestrial laser scanning is used to capture the geometry of three single folded bedding surfaces. The resulting light detection and ranging (LIDAR) point clouds are filtered and smoothed to enable meshing and calculation of principal curvatures. Fracture traces, picked from the LIDAR data, are used to calculate fracture densities. The rich data sets produced by this method provide statistically robust estimates of spatial variations in fracture density across the fold surface. The digital nature of the data also allows resampling to derive fracture parameters that are more traditionally measured manually from outcrops (e.g., one-dimensional line transects of fracture spacing). The fracture statistics derived from the LIDAR data are compared with the calculated principal and Gaussian curvatures of the surface to assess whether areas of extreme curvature correlate with high-fracture density. For the folds studied, all the fracture spacing distributions showed an exponential distribution, and no significant correlation between fracture density and surface curvature was observed. This questions the validity of using curvature as a proxy for high brittle strains and highlights the need for a complete understanding of fold and fracture mechanics that include considerations of other factors including lithology, strain rate, and confining pressure, not just finite strain. The three case studies also illustrate how terrestrial laser scanning can be used to gather detailed quantitative data sets on fracture and fold distributions from outcrop analogs.
    Description: Published
    Description: 771-794
    Description: JCR Journal
    Description: restricted
    Keywords: laser scanning tecnique ; 04. Solid Earth::04.03. Geodesy::04.03.09. Instruments and techniques
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 3
    Electronic Resource
    Electronic Resource
    Interferometric characterization of 160 fs far-infrared light pulses (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 893-895 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the first interferometric characterization of freely propagating, subpicosecond, far-infrared (FIR) light pulses. FIR light was generated via short pulse photoexcitation of a semi-insulating InP wafer. The half width of the intensity interferogram was 230 fs. The FIR light contained frequency components from 3 to 150 cm−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105268
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    The Effect of pH on Sanguinarine Iminium Ion Form (1986)
    s.l. : American Chemical Society
    Journal of natural products 49 (1986), S. 1109-1111 
    Details
    ISSN: 1520-6025
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/np50048a025
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Alteration of the lifetimes of autoionizing Rydberg states by a circularly polarized microwave field (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 3578-3581 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Autoionizing Rydberg states in zero field exhibit lifetimes scaling as the cube of the principal quantum number, n3, but in a linearly polarized static or microwave field the lifetimes scale as n4 due to l mixing. To mimic the effects of collisions with charged particles we have examined the effect of a circularly polarized field on the decay rate and find longer lifetimes than in a linearly polarized field, but not an n5 dependence. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.473453
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    Paper (German National Licenses)
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  • 6
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    Atrazine in public water supplies and risk of ovarian cancer among postmenopausal women in the Iowa Women's Health Study (2016)
    BMJ Publishing Group
    Details
    Publication Date: 2016-08-17
    Description: Background Few studies have evaluated environmental chemical exposures in relation to ovarian cancer. We previously found an increased risk of ovarian cancer among postmenopausal women in Iowa associated with higher nitrate levels in public water supplies (PWS). However, elevated nitrate levels may reflect the presence of other agricultural chemicals, such as atrazine, one of the most commonly detected pesticides in Iowa PWS. Methods We evaluated the association between atrazine in drinking water and incident ovarian cancer (N=145, 1986–2010) among 13 041 postmenopausal women in the Iowa Women's Health Study who used their PWS for ≥11 years as reported in 1989. Average levels of atrazine (1986–1987), nitrate-nitrogen (NO 3 -N, 1955–1988) and estimated levels of total trihalomethanes (TTHM, 1955–1988) from PWS monitoring data were linked to the participants' cities of residence. We computed HRs and 95% CIs by categories of the average atrazine level (not detected, ≤ or 〉0.37 parts per billion=median) using Cox proportional hazards regression adjusting for ovarian cancer risk factors. Results Atrazine was detected in water samples from 69 cities where 4155 women (32%) lived and levels were moderately correlated with NO 3 -N (=0.35) and TTHM (=0.24). Atrazine levels were not associated with ovarian cancer risk with or without adjusting for NO 3 -N and TTHM levels (p-trend=0.50 and 0.81, respectively). Further, there was no evidence for effect modification of the atrazine association by NO 3 -N or TTHM levels. Conclusions In our study with low atrazine detection rates, we found no association between atrazine in PWS and postmenopausal ovarian cancer risk.
    Print ISSN: 1351-0711
    Electronic ISSN: 1470-7926
    Topics: Medicine
    Published by BMJ Publishing Group
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  • 7
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    RPE65 gene therapy slows cone loss in Rpe65-deficient dogs (2013)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2013-05-10
    Description: RPE65 gene therapy slows cone loss in Rpe65-deficient dogs Gene Therapy 20, 545 (May 2013). doi:10.1038/gt.2012.63 Authors: F M Mowat, A R Breuwer, J T Bartoe, M J Annear, Z Zhang, A J Smith, J W B Bainbridge, S M Petersen-Jones & R R Ali
    Keywords: rAAV2leber congenital amaurosisRPE65canine modelcone photoreceptors
    Print ISSN: 0969-7128
    Electronic ISSN: 1476-5462
    Topics: Biology , Medicine
    Published by Nature Publishing Group (NPG)
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  • 8
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    Dynamic modelling of a UK North Sea saline formation for CO2 sequestration (2014)
    Geological Society of London
    Details
    Publication Date: 2014-04-26
    Description: Preliminary dynamic modelling, using TOUGH2/ECO2N, has been carried out to assess the suitability of a site in the UK North Sea for sequestering CO 2 . The potential storage site is a previously unused saline formation within the Permian Rotliegend sandstone. Data regarding the site are limited. Therefore, additional input parameters for the model have been taken from the literature and nearby analogues. The sensitivity of the model to a range of parameters has been tested. Results indicate that the site can sustain an injection rate of around 2.5 Mt a –1 of CO 2 for 20 years. The main control on pressure build-up in the model is the permeability of the unit directly beneath the Rotliegend in the location of the proposed storage site. The plume diameter is primarily controlled by the porosity and permeability of the site. A comparison between static, analytical and dynamic modelling highlights the advantages of dynamic modelling for a study such as this. Further data collection and modelling are required to improve predictions of pressure build-up and CO 2 migration. Despite uncertainties in the input data, the use of a full three-dimensional (3D) numerical simulation has been extremely useful for identifying and prioritizing factors that need further investigation.
    Print ISSN: 1354-0793
    Topics: Chemistry and Pharmacology , Geosciences
    Published by Geological Society of London
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  • 9
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    Incidence of solid tumours among pesticide applicators exposed to the organophosphate insecticide diazinon in the Agricultural Health Study: an updated analysis (2015)
    BMJ Publishing Group
    Details
    Publication Date: 2015-06-17
    Description: Objective Diazinon, a common organophosphate insecticide with genotoxic properties, was previously associated with lung cancer in the Agricultural Health Study (AHS) cohort, but few other epidemiological studies have examined diazinon-associated cancer risk. We used updated diazinon exposure and cancer incidence information to evaluate solid tumour risk in the AHS. Methods Male pesticide applicators in Iowa and North Carolina reported lifetime diazinon use at enrolment (1993–1997) and follow-up (1998–2005); cancer incidence was assessed through 2010(North Carolina)/2011(Iowa). Among applicators with usage information sufficient to evaluate exposure-response patterns, we used Poisson regression to estimate adjusted rate ratios (RRs) and 95% CI for cancer sites with ≥10 exposed cases for both lifetime (LT) exposure days and intensity-weighted (IW) lifetime exposure days (accounting for factors impacting exposure). Results We observed elevated lung cancer risks (N=283) among applicators with the greatest number of LT (RR=1.60; 95% CI 1.11 to 2.31; P trend =0.02) and IW days of diazinon use (RR=1.41; 95% CI 0.98 to 2.04; P trend =0.08). Kidney cancer (N=94) risks were non-significantly elevated (RR LT days =1.77; 95% CI 0.90 to 3.51; P trend =0.09; RR IW days 1.37; 95% CI 0.64 to 2.92; P trend =0.50), as were risks for aggressive prostate cancer (N=656). Conclusions Our updated evaluation of diazinon provides additional evidence of an association with lung cancer risk. Newly identified links to kidney cancer and associations with aggressive prostate cancer require further evaluation.
    Print ISSN: 1351-0711
    Electronic ISSN: 1470-7926
    Topics: Medicine
    Published by BMJ Publishing Group
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  • 10
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    Robust best-fit planes from geospatial data (2016)
    Geological Society of America (GSA)
    In: Geosphere
    Details
    Publication Date: 2016-01-28
    Description: Total least squares regression is a reliable and efficient way to analyze the geometry of a best-fit plane through georeferenced data points. The suitability of the input data, and the goodness of fit of the data points to the best-fit plane are considered in terms of their dimensionality, and they are quantified using two parameters involving the minimum and intermediate eigenvalues from the regression, as well as the spatial precision of the data.
    Electronic ISSN: 1553-040X
    Topics: Geosciences
    Published by Geological Society of America (GSA)
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