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  • Articles  (554)
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  • Articles  (554)
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  • 1
    facet.materialart.
    Unknown
    Crystal structure of the charge-transfer complex 2-(1,2,3,4-tetrahydronaphthalen-1-ylidene)hydrazinecarbothioamide–pyrazine-2,3,5,6-tetracarbonitrile (2/1) (2014)
    International Union of Crystallography (IUC)
    Details
    Publication Date: 2014-09-07
    Description: The reaction of 2-(1,2,3,4-tetrahydronapthalen-1-ylidene)hydrazinecarbothioamide (TTSC) with pyrazine-2,3,5,6-tetracarbonitrile (tetracyanopyrazine, TCNP) yields the title 2:1 charge-transfer adduct, 2C11H12N3S·C6N8. The complete TCNP molecule is generated by a crystallographic inversion centre and the non-aromatic ring in the TTSC molecule adopts an envelope conformation with a methylene C atom as the flap. In the crystal, the thiosemicarbazone molecules are connected through inversion-related pairs of N—H...S interactions, building a polymeric chain along the b-axis direction. The TCNP molecules are embedded in the structure, forming TTSC–TCNP–TTSC stacks with the aromatic rings of TTSC and the molecular plane of TCNP in a parallel arrangement [centroid–centroid distance = 3.5558 (14) Å]. Charge-transfer (CT) via π-stacking is indicated by a CT band around 550 cm−1 in the single-crystal absorption spectrum.
    Keywords: charge-transfer composite compoundtetracyanopyrazinethiosemicarbazonecrystal structure
    Electronic ISSN: 1600-5368
    Topics: Chemistry and Pharmacology , Geosciences
    Published by International Union of Crystallography (IUC)
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  • 2
    facet.materialart.
    Unknown
    Crystal structure of the charge-transfer complex 2-(1,2,3,4-tetrahydronaphthalen-1-ylidene)hydrazinecarbothioamide–pyrazine-2,3,5,6-tetracarbonitrile (2/1) (2014)
    International Union of Crystallography
    Details
    Publication Date: 2014-09-06
    Description: The reaction of 2-(1,2,3,4-tetrahydronapthalen-1-ylidene)hydrazinecarbothioamide (TTSC) with pyrazine-2,3,5,6-tetracarbonitrile (tetracyanopyrazine, TCNP) yields the title 2:1 charge-transfer adduct, 2C11H12N3S·C6N8. The complete TCNP molecule is generated by a crystallographic inversion centre and the non-aromatic ring in the TTSC molecule adopts an envelope conformation with a methylene C atom as the flap. In the crystal, the thiosemicarbazone molecules are connected through inversion-related pairs of N—H...S interactions, building a polymeric chain along theb-axis direction. The TCNP molecules are embedded in the structure, forming TTSC–TCNP–TTSC stacks with the aromatic rings of TTSC and the molecular plane of TCNP in a parallel arrangement [centroid–centroid distance = 3.5558 (14) Å]. Charge-transfer (CT)viaπ-stacking is indicated by a CT band around 550 cm−1in the single-crystal absorption spectrum.
    Electronic ISSN: 1600-5368
    Topics: Chemistry and Pharmacology , Geosciences
    Published by International Union of Crystallography
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  • 3
    Electronic Resource
    Electronic Resource
    Relationship of Geology, Physiography, Agricultural Land Use, and Ground-Water Quality in Southwest Georgia (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 23 (1985), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Water samples were collected from 34 wells in the Claiborne aquifer in southwest Georgia. Land use/cover is principally forest, wetland, or agriculture. The aquifer is exposed surficially to the northwest but dips beneath confining beds to the southeast. The Claiborne aquifer is generally a fine- to medium-grained quartz sand becoming more calcareous downdip and to the east. Well water was analyzed in the field for pH, electrical conductivity, alkalinity, hardness, and temperature, and in the laboratory for Cl, NH4, NO3, total N, total P, ortho-P, SO4, K, Na, Ca, Mg, and Fe. Hardness gradually increases from 5 mg/1 updip to 162 mg/1 downdip and bicarbonate alkalinity follows the same trend reflecting variations in the aquifer lithology. Higher than normal nitrate concentrations (4-6 mg/1) are found in ground water in the exposed updip portion of the aquifer in areas where agricultural land use for cropland is high. However, in forest-covered areas, ground water in the exposed portion of the aquifer contains nitrate concentrations similar to the confined areas of the aquifer: less than 1 mg/1. Other chemical constituents measured do not show a discernible pattern of variation. One well near a fertilizer storage facility contains nitrate concentrations exceeding the Safe Drinking Water Standards, and other wells in the agricultural portion of the outcrop belt may seasonally exceed these limits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1985.tb01511.x
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  • 4
    Electronic Resource
    Electronic Resource
    Location and Characterization of Subsurface Anomalies Using a Soil Conductivity Probe (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water monitoring & remediation 20 (2000), S. 0 
    Details
    ISSN: 1745-6592
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: An electrical conductivity probe, designed for use with “direct push” technology, has been successfully used to locate buried drums, contaminant plumes, and to precisely locate and characterize a previously installed permeable reactive iron wall. The conductivity probe was designed to characterize various soil and sediment types as it was driven through the dry and saturated soil matrix; however, its ability to locate and characterize subsurface anomalies may also prove to be a valuable asset. The probe uses an electrical field that works like and mimics the results from an oilfield engineering tool called the Wenner array. This electrical field array penetrates into the soil matrix to measure the electrical conductivity of the soil matrix surrounding the probe to a radius of about two to four inches. This tool has allowed operating personnel to verify the location of manmade or natural subsurface anomalies with precision.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6592.2000.tb00265.x
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  • 5
    Electronic Resource
    Electronic Resource
    Flood and earthquake disturbance of 210Pb geochronology (Lake Anterne, NW Alps) (2002)
    Oxford UK : Blackwell Science Ltd
    Terra nova 14 (2002), S. 0 
    Details
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Dating recent lake sediment records yielding disturbed 210Pb profiles has been a problem of wide interest in palaeoclimatic and palaeoseismic studies over the last few centuries. When applied to an alpine lake sedimentary record, a high-resolution sedimentological study reveals that the 210Pb profile is disturbed by the occurrence of single-event deposits triggered by two different mechanisms: flood events deposits and gravity reworking. Removing disturbed layers from the 210Pb profile yields a logarithmic depth–activity relationship. Using a simple 210Pb decay model (CFCS) provides an assessment of mean accumulation rate of `continuous sedimentation', as opposed to `event-linked sedimentation'. The correlation of the thickest four gravity-reworked deposits with historically known earthquakes permits both validation and refinement of the age–depth relationship. This refinement highlights variations in accumulation rate consistent with post-Little Ice Age climatic variations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3121.2002.00413.x
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  • 6
    Electronic Resource
    Electronic Resource
    An inverse approach to heat flow study in hydrologically active areas (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 98 (1989), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Heat transport by large-scale groundwater movement, reported for a number of sedimentary basins, may cause sufficiently severe perturbations to the thermal regime that the patterns of near surface heat-flow density (HFD) may be very different from that of the desired deep-seated conductive HFD. However, a good interpretation of the HFD data from perturbed areas is possible when knowledge of both the thermal and hydrological regimes is available, but there are three major difficulties. First, the thermal and hydrological data are often noisy; second, the two regimes are closely coupled; third, the deep-seated, or basal HFD is a very uncertain boundary condition. In this paper, we present a method, currently in 2-D, that inverts the noisy thermal and hydrological data simultaneously, and is able to resolve uncertain boundary conditions. The temperature and hydraulic head and the thermal conductivities and intrinsic permeabilities of the subsurface materials are first parameterized with an isoparametric finite element model. The parameters are then estimated using a Bayesian type non-linear inverse method. In the finite element formulation, the boundary heat and water fluxes are linearly transformed into an equivalent nodal flow (ENF) vector, which is updated together with the estimated parameters. Another (linear) inversion of the updated ENF components gives the updated boundary fluxes, with variances. The applications of the boundary flux updating technique to the determination of the background HFD in hydrologically active areas are illustrated with numerical examples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1989.tb05514.x
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  • 7
    Electronic Resource
    Electronic Resource
    Direct Push Methods for Locating and Collecting Cores of Aquifer Sediment and Zero-Valent Iron from a Permeable Reactive Barrier (2002)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water monitoring & remediation 22 (2002), S. 0 
    Details
    ISSN: 1745-6592
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: It is often necessary to collect core samples that are not accommodated by standard sampling protocols, This paper describes innovative techniques using existing technology that enables researchers to collect samples at upgradient and downgradient interfaces from a zero-valent iron wall so that the most active zone of chromium remediation and biologic activity can be studied. It describes the methodology used and how the direct-push technology was adapted so that the desired samples could be collected. It also explains why new methods were needed and demonstrates the results of these efforts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6592.2002.tb00765.x
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  • 8
    Electronic Resource
    Electronic Resource
    Implications of Subsurface Heterogeneity at a Potential Monitored Natural Attenuation Site (2001)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water monitoring & remediation 21 (2001), S. 0 
    Details
    ISSN: 1745-6592
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Direct-push sampling was conducted at a site previously characterized with conventional monitoring wells. Hydrogeological and chemical heterogeneities not represented in the original site conceptual model were detected by direct-push sampling. These heterogeneities were important in terms of their impact on the assessment of monitored natural attenuation at the site. This research suggests that additional sampling efforts could be attempted at some sites to test the accuracy of site conceptual models. The leading edge of a contaminant plume must be examined closely, because conceptual errors in this area could easily allow impacts to receptors to remain undetected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6592.2001.tb00746.x
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  • 9
    Electronic Resource
    Electronic Resource
    Fluid-escape features as a precursor of a large sublacustrine sediment slide in Lake Le Bourget, NW Alps, France (2004)
    Oxford, UK : Blackwell Science Ltd
    Terra nova 16 (2004), S. 0 
    Details
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The north-western corner of Lake Le Bourget is situated along an active fault zone and accommodated a large sediment supply from the Rhone River until the end of the Late Glacial period. On the delta slope, the Holocene sheet drape that covers the largest buried mass wasting deposit (the HDU) shows undulations, small fractures and discontinuities that are attributed to downslope creep. Evidence for episodes of vigorous fluid expulsion is found in association with these discontinuities. All these features are rooted at the top of the HDU and occur along two specific isobaths. These observations indicate a close link between fractures and focused fluid flow. We suggest that focused fluid flow triggered by earthquakes facilitates the formation of small-scale faults that accommodate part of the downslope movement and eventually link up to form a head-scarp of a large slide (c. 107 m3).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3121.2004.00566.x
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  • 10
    Electronic Resource
    Electronic Resource
    Struktur von bis[di(1,5-di-p-tolyl-1,4-pentazadienido)nickel(II)] (1987)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 43 (1987), S. 1293-1295 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270187092126
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