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  • Authors: Caron, D.;

    Etude des relations entre la maladie de l'écorce du Hêtre et la pollution atmosphérique en Basse Seine

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  • Authors: Stein Håland; S. Ullaland; Tadayoshi Doke; Geoff Reeves; +3 Authors

    A tailward moving plasmoid (flux rope) was observed by the GEOTAIL spacecraft at [-22, 5, -3 RE GSE] after a period with strong geomagnetic activity on November 27, 1995. The structure exhibited classic plasmoid like signatures; bipolar Bz, a strong core field and tailward streaming ions. Measurements from the solar wind and the ground show that the GEOTAIL-observations were correlated with a change in the IMF and a substorm onset. Together, these observations suggest that the flux rope was launched as a result of magnetic reconnection during substorm onset, and that the reconnection site was located earthward of -22 RE. To our knowledge, observations of similar substorm associated flux rope formation and tailward streaming ions at such distances have not been reported earlier.

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    https://doi.org/10.1007/978-94...
    Part of book or chapter of book . 1998 . Peer-reviewed
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      https://doi.org/10.1007/978-94...
      Part of book or chapter of book . 1998 . Peer-reviewed
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: van Drooge, Barend L.; Sicard, Michaël; Stohl, Andreas; Fontal, Marta; +5 Authors

    The combined use of chemical analysis of organic molecules in atmospheric aerosols (PM1) collected in situ in Barcelona and optical measurements with a light detection and ranging (LIDAR) instrument allowed the characterization of the smoke plume from a wildfire that reached the city in July 2012. Analysis of the chemical composition of the aerosols collected on 23 July 2012 confirmed the large effect of biomass burning on urban air quality during a period of several hours. Typical biomass burning tracers, such as levoglucosan, dehydroabietic acid and polycyclic aromatic hydrocarbons (PAH) were enhanced at the same time as the aerosol concentrations in the boundary layer increased. According to air-mass trajectory modeling, the biomass burning particles originated from a severe wildfire burning 120 km northeast of the city. On the following days, no significant contribution of wildfire smoke was found in the urban air, although the lidar detected particles aloft. A Lagrangian particle dispersion model (FLEXPART) was used to simulate the transport of aerosols (PM2.5) and carbon monoxide (CO), and the simulated concentrations in Barcelona were compared to in-situ measurements. FLEXPART simulated the onset of the wildfire smoke plume event in the urban center in the early morning of 23 July successfully; by contrast, the fast passage of the plume at the surface and the decoupling of the cleaner boundary layer from the persistent smoke plume aloft was not well captured. This was attributed to the fact that the model did not capture the local sea-breeze circulation well enough. Peer Reviewed

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    Recolector de Ciencia Abierta, RECOLECTA
    Other literature type . Article . 2016 . Peer-reviewed
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    Atmospheric Pollution Research
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Recolector de Cienci...arrow_drop_down
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      Recolector de Ciencia Abierta, RECOLECTA
      Other literature type . Article . 2016 . Peer-reviewed
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      Atmospheric Pollution Research
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  • Authors: S. Hargrove; Shamsuddin Ilias;

    ABSTRACT The effect of flow reversal on permeate flux in cross-flow ultrafiltration of bovine serum albumin (BSA) has been investigated experimentally. BSA is a well-studied model solute in membrane filtration known for its fouling and concentration polarization capabilities. Ultrafiltration experiments were performed with BSA feed solutions in a hollow-fiber membrane module. The BSA feed concentrations ranged from 0.01 to 5 wt% and were ultrafiltered at a transmembrane pressure of 20 psia. Permeate flux was determined both with and without the use of flow reversal for each concentration. The experimental results indicate that under flow reversal conditions, the permeate flux is enhanced significantly when compared with runs without flow reversal. The effect of flow reversal on flux enhancement is very pronounced for dilute BSA solutions.

    Separation Science a...arrow_drop_down
    Separation Science and Technology
    Article . 1999 . Peer-reviewed
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    Separation Science and Technology
    Article . 1999 . Peer-reviewed
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      Separation Science a...arrow_drop_down
      Separation Science and Technology
      Article . 1999 . Peer-reviewed
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      Separation Science and Technology
      Article . 1999 . Peer-reviewed
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Sigeo Narita;
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Journal of the Minin...arrow_drop_down
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  • image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    Authors: Wenbin Wang; Alan G. Burns; Michael Wiltberger; Stanley C. Solomon; +1 Authors

    It is generally assumed that viscosity smooths out vertical gradients of the horizontal thermospheric winds in the upper thermosphere, and thus observations of neutral winds at one height can be used at other altitudes in this region. In this paper we present neutral wind simulations of the May 1997 geomagnetic storm using the Coupled Magnetosphere‐Ionosphere‐Thermosphere (CMIT) model. The model results show that during quiet periods, the assumption of a shearless vertical profile of the horizontal winds is generally valid in low and middle latitudes, although vertical shears do occur in wind profiles in the upper thermosphere in some locations at higher latitudes. During disturbed periods, large variations in the vertical profiles of the upper thermospheric winds are seen globally in the model simulations. A diagnostic analysis of the forcing processes in the neutral momentum equations shows that (1) during quiet time, there are shearing forces, most noticeably the pressure gradient and ion drag, in the upper thermosphere that result in a net momentum forcing that changes with height; this induces altitude variations in the wind profiles at high latitudes and sometime even at middle latitudes. (2) During storm time, momentum advection, which is relatively weak during the quiet time, becomes a dominant force globally. Pressure gradient forces are also significantly enhanced. Ion drag, on the other hand, can be enhanced or suppressed, depending on the location of positive or negative effects. All these forces exhibit significant altitude variations that lead to a net force that is greatly enhanced and has large vertical shears. This produces globally enhanced neutral winds that vary with height. (3) Viscosity is less important than other forcing processes during both the quiet and storm periods and thus cannot prevent shears from occurring in the vertical profiles of the horizontal winds. Viscosity has an insignificant effect on vertical shears that change with height linearly. It, however, does restrict vertical shears that vary nonlinearly with height. The effectiveness of the viscosity in restricting such shears depends on its magnitude. In our simulations, viscosity is weaker than other forcing processes and thus is a relatively slow process, so it will take a few hours for viscosity to reduce such shears.

    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Journal of Geophysic...arrow_drop_down
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    Journal of Geophysical Research Atmospheres
    Article . 2008 . Peer-reviewed
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      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Journal of Geophysic...arrow_drop_down
      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
      Journal of Geophysical Research Atmospheres
      Article . 2008 . Peer-reviewed
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    Целью исследования является изучение закономерностей пространственного варьирования гидротермического коэффициента за вегетационный период в условиях Крымского полуострова. Исследования проводились на базе сектора агроэкологии, материалами послужили электронная модель рельефа SRTM-3 территории Крымского полуострова и многолетние данные наблюдений метеостанций. Для оценки условий увлажнения зон выращивания винограда использован гидротермический коэффициент Г.Т.Селянинова (ГТК). Для анализа закономерностей пространственного распределения ГТК использован подход раздельного анализа закономерностей варьирования двух слагающих данный коэффициент факторов - суммы активных температур выше 10 °С и суммы осадков за период со среднесуточной температурой выше 10 °С. Разработанные ранее модели, описывающие распределение суммы активных температур, изучены в большей степени, по сравнению с моделями пространственного распределения количества осадков, по этой причине рассматривался только вопрос разработки последних. За основу работы была взята глобальная климатическая модель WorldClim version 2.0. Используя помесячные данные этой модели, были рассчитаны для каждой из анализируемых опорных точек величины сумм осадков за вегетационный период и произведено сравнение с фактическими величинами. В качестве альтернативы была построена также линейная многофакторная модель, включающая в качестве независимых переменных географическую широту и абсолютную высоту над уровнем моря. В результате проведенного геоинформационного моделирования на основании модели, показавшей наибольшую точность, построена цифровая крупномасштабная карта пространственного распределения величины ГТК на территории Крымского полуострова. The aim of research is to study regularities of spatial variation of the hydrothermal coefficient during the growing season in the conditions of the Crimean Peninsula. The studies were carried out on the basis of Agroecology Sector. Digital elevation model SRTM-3 of the Crimean Peninsula territory and long-term observations of meteorological stations functioned as study materials. To assess the moisture conditions of grape cultivation zones the hydrothermal coefficient of G. T. Selyaninov (HTC) was used. To analyze the regularities of spatial distribution of HTC, we used the approach of separate analysis of variation laws of two composing factors - the sum of active temperatures above 10 ° C and the sum of precipitation for a period with an average daily temperature above 10 ° C. Previously developed models describing the distribution of the sum of active temperatures were studied to a greater extent in comparison with models of dimentional distribution of precipitation. For this reason only the issue of developing the latter was considered. The work was based on the global climate model WorldClim version 2.0. Using the monthly data of the model, for each of the analyzed control points, the amount of precipitation for the growing season was calculated and compared with the actual values. As an alternative, a linear multifactor analog, including latitude and altitude as independent variables, was also constructed. As a result of geographic information modeling carried out on the basis of the model showed the highest accuracy, a digital large-scale map of HTC value distribution on the territory of the Crimean Peninsula was built.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Magarach Vinogradstv...arrow_drop_down
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    Magarach Vinogradstvo i Vinodelie
    Article . 2020 . Peer-reviewed
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      Magarach Vinogradstvo i Vinodelie
      Article . 2020 . Peer-reviewed
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  • image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    Authors: Lufei Jia; Edward J. Anthony; Ivan Lau; Jinsheng Wang;

    Ignition tests were conducted with delayed and fluid petroleum cokes, a high volatile bituminous coal and their blends in bench- and pilot-scale fluidized bed combustors. In the bench-scale FBC tests, a visual inspection ignition criterion was developed based on the ‘CO–CO2’ profiles obtained as a function of time and bed temperature. In the pilot-scale unit, the rapid increase in SO2 levels was used as the indicator of fuel ignition. In addition to the fluidized bed ignition tests, thermogravimetric analysis (TGA) measurements were made on all fuels and their chars. The results showed that, while the fluid coke (which has the lowest volatile content) was the most difficult to ignite, ignition was not a simple function of volatile content. Further, different test methods and ignition criteria demonstrated significantly different ignition temperatures, with the largest variation arising between bench- and pilot-scale equipment. Finally, tests on mixtures of petroleum coke and coal showed that there was no interaction between these two fuels, and that the coke ignited only when it achieved its own ignition temperature.

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    Fuel
    Article . 2006 . Peer-reviewed
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      Fuel
      Article . 2006 . Peer-reviewed
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  • Authors: Enrico Primo Tomasini;
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  • Authors: L.J. Klinkenberg;
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    Authors: Ekaterina Cheremazova; Sergey Skublov; Konstantin Novoselov; Alex Mikhailov; +2 Authors

    The Central Iberian Zone presents an exceptional geological interest for its great exploration potential for a number of elements including gold. Metallogeny within the area is mainly related to regional metamorphism and late magmatic activity during the Variscan orogeny. In 2013-2014 junior company Mineral Exploration Network Ltd. has carried out an extensive prospecting field work with a primarily view to discover Au within the area around Logrosan granitic pluton (Caceres, Spain). The main output of the survey was a localization and presorting of potentially mineralized territory unites at the extensive spatial scale (more than 240 sq. km). The known gold showings in the Central Iberian zone are considered to be synorogenic with a mainly metamorphic fluid source. As arsenic commonly forms widespread geochemical haloes near practically all orogenic gold deposits and appears to be easily and credibly measured by express analytical methods (XRF), it was selected as one of the major pathfinder elements for the initial prospecting. Designed geochemical survey allowed delineating potential target area with contrastive complex As-W-Zn-Pb anomaly in soil sediments and significant quantities of gold particles in heavy mineral concentrates. Placer gold particles analyses and their typomorphic features confirmed nearby primary gold source existence. The suggested scope of work proved to be efficient for assessing mineralization potential and selecting perspective target areas for a detailed drilling.

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    Journal of Iberian Geology
    Article . 2015 . Peer-reviewed
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      Journal of Iberian Geology
      Article . 2015 . Peer-reviewed
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  • Authors: H. Vai Yee; Suzalina Zainal; Jamil Jelani; Ismail Mohd Saaid;

    Bottomhole data availability is important for managing reservoir and well deliverability. Adequate knowledge on key well/reservoir parameters assists in both production planning and reserves recovery. However, continuous data acquisition is often where we stumbled, due to a combination of economic, operational/logistical constraints such as economically unjustifiable downhole monitoring devices, risk of fishing/well downtime via well intervention measurement. An alternative to direct bottomhole data acquisition through well intervention is to employ advanced PVT model where surface data and established correlations are used to estimate these downhole data, with reasonable accuracy. To enable an accurate downhole data determination, understanding of wellbore dynamic behavior is crucial in shut-in well performance modeling. However, the major assumption in current PVT equations is instantaneous transformation of one phase (gas) into another phase (oil). During shut-in, this assumption leads to inaccuracy in gas/liquid distribution in the well and hence, an incorrect prediction of interphase level, in-situ density and pressure distribution in the well. This inaccurate PVT characteristic leads to unreliable estimated downhole data, particularly the reservoir pressure. Our research aims to improve the current estimation method by incorporating the time dimension, mass transfer rate, into well performance modeling. The strategy is to develop a novel PVT incorporating mass transfer rate model by employing the basic model of black oil PVT, EoS and mass transfer rate equations. A mathematical correlation which incorporates the time dimension as inherited in the mass transfer theory is devised. Therefore, the model is able to determine an accurate volume of each fluid phase at any node in the wellbore by incorporating the fluid segregation, mass transfer rate and fluid ingress in the reservoir during shut-in. This better description of wellbore dynamic behavior improves the accuracy of well performance modeling ensuring a reliable downhole data determination.

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  • Authors: F. Van Rickstal;
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    Authors: Rory D. Cottrell; John A. Tarduno; Richard K. Bono; M. S. Dare; +1 Authors

    AbstractWe introduce a new paleomagnetic test, applicable to metamorphosed terrains, that assesses the recording fidelity of a metasediment. Magnetic mineral carriers with unblocking temperatures lower than the peak metamorphic temperature should record a common remagnetization direction, whereas those with higher unblocking temperatures should be randomly distributed if a primary magnetization has been preserved on a sedimentary grain scale. We call this an inverse microconglomerate test. Application to metasediments of the Jack Hills (JH), Western Australia, reveals that the chrome mica fuchsite records a well‐grouped secondary magnetization at unblocking temperatures between ∼270 and 340°C, in contrast to the random distribution of in situ directions held by zircons isolated at unblocking temperatures >550°C. This positive test further supports JH zircons as hosts of primary Hadean magnetizations. More generally, the new test can aid in understanding the timing of peak metamorphism and deformation in complex terrains.

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    Geophysical Research Letters
    Article . 2016 . Peer-reviewed
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      Geophysical Research Letters
      Article . 2016 . Peer-reviewed
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    Authors: F Aumento;
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    Authors: Benjamin Butler; Hilary Kennedy;

    AbstractFrozen seawater is a composite material with a sponge‐like structure. The framework of the structure is composed of pure ice, and within the pores exists a concentrated seawater brine. When the temperature is reduced, the volume of this residual brine decreases, while its salinity increases. As a result of the paired changes to temperature and salinity, the brine eventually becomes supersaturated with respect to a mineral, resulting in the precipitation of microscopic crystals throughout the ice structure. Due to experimental constraints, the current understanding about the formation of these minerals relies on the analysis of the residual brine, rather than the mineral phase. Here synchrotron X‐ray powder diffraction was used to assess the