120,626 research outputs found
robitalec/targets-issa: v0.0.0.9000
No full text:hammer_and_wrench: A targets workflow for integrated step selection analyses (iSSA
Bibliothèque d\u27Alexandrie : regards sur le monde, regards sur l\u27Egypte
No full textEnregistrement de la conférence-débat organisée à l\u27enssib dans le cadre du cycle "Bibliothèque & international".
Anis Issa met en lumière la bibliothèque d’Alexandrie, son histoire et sa situation dans le monde ancien, sa renaissance à l\u27ère contemporaine dans un grand élan de coopération internationale, et son rôle actuel non seulement en tant que bibliothèque mais aussi en tant que complexe culturel dynamique.
Anis Issa est titulaire d’un master en art, histoire et archéologie, et travaille comme bibliothécaire à la Bibliotheca Alexandrina, ouverte en 2002. Il a fait partie du groupe initial qui a piloté le projet de pôle francophone
A folkloristic image of homeland in the novel „The Issa valley“ by Czesław Miłosz
No full texte-ISSN 2029-8692The article reveals that the novel The Issa valley by Czesław Miłosz aims to represent the Issa valley as a preserver of an archaic cultural heritage, mainly by using folklore genres which have preserved mythical thinking (mythological songs, belief legends and historical legends). It may be observed that nearly all folklore material at least in some detail is associated with the river Issa – the fulcrum of the represented world. In the novel, folklore material is employed when the author seeks to reveal a junction of paganism and Christianity and the battle between them, which continues both in the collective world outlook of the inhabitants of the Issa valley and in the inner world of a particular person. Orienting himself to folkloristic prototypes, the author in his novel epitomizes individual characters. Moreover, the article discloses that mythological songs about the Sun and the Moon, which in the novel are introduced as registered on the river Issa (Nevėžis is a prototype of Issa), in reality are taken from a song collection by L. Rėza Dainos oder Litthauische Volkslieder (1825), published in Lithuania Minor.Kultūrų studijų katedra / Department of Cultural StudiesHumanitarinių mokslų fakultetas / Faculty of HumanitiesVytauto Didžiojo universitetas / Vytautas Magnus Universit
Phosphorus recovery and leaching of trace elements from incinerated sewage sludge ash (ISSA).
No full textChemical extraction of phosphorus (P) from incinerated sewage sludge ash (ISSA) is adversely influenced by co-dissolution of metals and metalloids. This study investigated P recovery and leaching of Zn, Cu, Pb, As and Ni from ISSA using inorganic acids (sulphuric acid and nitric acid), organic acids (oxalic acid and citric acid), and chelating agents (ethylenediaminetetraacetic acid (EDTA) and ethylene diamine tetramethylene phosphonate (EDTMP)). The aim of this study was to optimize a leaching process to recover P-leachate with high purity for P fertilizer production. The results show that both organic and inorganic acids extract P-containing phases but organic acids leach more trace elements, particularly Cu, Zn, Pb and As. Sulphuric acid was the most efficient for P recovery and achieved 94% of total extraction under the optimal conditions, which were 2-h reaction with 0.2 mol/L H2SO4 at a liquid-to-solid ratio of 20:1. EDTA extracted only 20% of the available P, but the leachates were contaminated with high levels of trace elements under optimum conditions (3-h reaction with EDTA at 0.02 mol/L, pH 2, and liquid-to-solid ratio of 20:1). Therefore, EDTA was considered an appropriate pre-treatment agent for reducing the total metal/metalloid content in ISSA, which produced negligible changes in the structure of ISSA and reduced contamination during subsequent P extraction using sulphuric acid
Fourier decomposition algorithm for leaky modes of fibres with arbitrary geometry
No full textA new algorithm for calculating the confinement loss of leaky modes in arbitrary fibre structures is presented within the scalar wave approximation. The algorithm uses a polar-coordinate Fourier decomposition method with adjustable boundary conditions (ABC-FDM) to model the outward radiating fields. Leaky modes are calculated for different examples of microstructured fibres with various shaped holes
Control of transient power during unintentional islanding of microgrids
No full textIn inverter-based microgrids, the paralleled inverters need to work in grid-connected mode and stand-alone mode and to transfer seamlessly between the two modes. In grid-connected mode, the inverters control the amount of power injected into the grid. In stand-alone mode, however, the inverters control the island voltage while the output power is dictated by the load. This can be achieved using the droop control. Inverters can have different power set-points during grid-connected mode but in stand-alone mode they all need their power set-points to be adjusted according to their power ratings. However, during sudden unintentional islanding (due to loss of mains), transient power can flow from inverters with high power setpoints to inverters with low power set-points, which can raise the DC link voltage of the inverters causing them to shut down. This paper investigates the transient circulating power between paralleled inverters during unintentional islanding and proposes a controller to limit it. The controller monitors the DC link voltage and adjusts the power set-point in proportion to the rise in the voltage. A small signal model of an islanded microgrid is developed and used to design the controller. Simulation and experimental results are presented to validate the design
Data for: A comparative adsorption study of benzophenone-3 onto synthesized lipophilic organosilicate, Laponite and montmorillonite
No full textIn this study, the adsorption of a hydrophobic molecule, benzophenone-3 (BZ-3) was investigated onto three adsorbents: synthesized lipophilic organosilicate (OSL), Laponite (Lap) and montmorillonite (Mt). A comparative study for all adsorbents with batch adsorption experiments was achieved to determine the optimal conditions. The effects of the main experimental parameters were determined such as solvent, pH, temperature, initial concentration of BZ-3 and contact time. The adsorption capacity was evaluated by means of HPLC analysis equipped with UV detection and the adsorbent - BZ-3 complexes were characterized by means of Dynamic Light Scattering (DLS) analysis and Attenuated Total Reflectance - Fourier Transform InfraRed (ATR - FTIR) spectroscopy. Finally, the adsorption isotherm equilibrium was described according to Langmuir, Freundlich and Temkin models. The results showed that optimal value of the adsorbed BZ-3 for all adsorbents was found at pH 10, at 38 °C, with BZ-3 concentration of 2.5 g/L during 24 h of contact time. The results obtained showed a promising capacity of the OSL to adsorb BZ-3 (340 mg of BZ-3/g of adsorbent) compared to Lap (137 mg/g) and Mt (192.3 mg/g). Langmuir model fitted the best with OSL and Mt adsorption while Freundlich model fitted the best with Lap adsorption
Phosphorus recovery and leaching of trace elements from incinerated sewage sludge ash (ISSA)
No full textChemical extraction of phosphorus (P) from incinerated sewage sludge ash (ISSA) is adversely influenced by co-dissolution of metals and metalloids. This study investigated P recovery and leaching of Zn, Cu, Pb, As and Ni from ISSA using inorganic acids (sulphuric acid and nitric acid), organic acids (oxalic acid and citric acid), and chelating agents (ethylenediaminetetraacetic acid (EDTA) and ethylene diamine tetramethylene phosphonate (EDTMP)). The aim of this study was to optimize a leaching process to recover P-leachate with high purity for P fertilizer production. The results show that both organic and inorganic acids extract P-containing phases but organic acids leach more trace elements, particularly Cu, Zn, Pb and As. Sulphuric acid was the most efficient for P recovery and achieved 94% of total extraction under the optimal conditions, which were 2-h reaction with 0.2 mol/L H2SO4 at a liquid-to-solid ratio of 20:1. EDTA extracted only 20% of the available P, but the leachates were contaminated with high levels of trace elements under optimum conditions (3-h reaction with EDTA at 0.02 mol/L, pH 2, and liquid-to-solid ratio of 20:1). Therefore, EDTA was considered an appropriate pre-treatment agent for reducing the total metal/metalloid content in ISSA, which produced negligible changes in the structure of ISSA and reduced contamination during subsequent P extraction using sulphuric acid.</p
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