Search results for "ATAL"
showing 10 items of 10591 documents
La defensa y los proyectos de fortificación de Vinaròs en los siglos XVI y XVII
2020
Este artículo analiza el sistema defensivo de Vinaròs durante el siglo XVI y los proyectos de ingeniería para la construcción de una fortaleza moderna en esa villa durante la Guerra de Cataluña (1640-52). Pese a que fueron cuatro los ingenieros que propusieron sus respectivos planes, solo dos de ellos pueden analizarse en profundidad gracias a que se conservan los planos e informes de sus autores, don Francisco de Lorenzana y Castro (1648) y Francisco de Isasi (1649).
Prodotti innovativi premiscelati per il rivestimento superficiale di edifici: attività fotocatalitica ed influenza dei pigmenti minerali
2009
Characterizing Cavities in Model Inclusion Fullerenes: A Comparative Study
2001
Abstract: The fullerene-82 cavity is selected as a model system in order to test several methods for characterizing inclusion molecules. The methods are based on different technical foundations such as a square and triangular tessellation of the molecular surface, spherical tessellation of the molecular surface, numerical integration of the atomic volumes and surfaces, triangular tessellation of the molecular surface, and cubic lattice approach to the molecular volume. Accurate measures of the molecular volume and surface area have been performed with the pseudorandom Monte Carlo (MCVS) and uniform Monte Carlo (UMCVS) methods. These calculations serve as a reference for the rest of the meth…
Tuning the Electrochemistry of Free-Base Porphyrins in Acidic Nonaqueous Media: Influence of Solvent, Supporting Electrolyte, and Ring Substituents
2016
International audience; A detailed study of reduction potentials, electroreduction mechanisms and acid-base chemistry was carried out on two series of free-base porphyrins in nonaqueous media. The first series is represented by four-pyrrole substituted tetraphenylporphyrin (TPP) derivatives, two of which are planar and two of which are nonplanar in their non-protonated form. The second comprises porphyrins with 0-4 meso-phenyl groups on the macrocycle. Equilibrium constants for conversion of each neutral porphyrin to its diprotic [H4P] 2+ form were determined and the electrochemistry was then elucidated as a function of: (i) type of nonaqueous solvent, (ii) anion of supporting electrolyte, …
Supported Poly(Ionic Liquid)-Heteropolyacid Based Materials for Heterogeneous Catalytic Fructose Dehydration in Aqueous Medium
2022
Two sets of four different supported catalyst materials were prepared. One set was obtained by polymerization of a bis-vinylimidazolium salt, which formed a poly(ionic liquid) coating on SiO2, TiO2, boron nitride BN, and carbon nitride C3N4. The other set was, instead, obtained by immobilizing Keggin heteropolyacid H3PW12O40 onto poly-imidazolium functionalized materials. All the catalysts, including the bare supports, were subjected to physical and chemical characterization by XRD, SEM, Specific Surface Area and pore size measurements, TGA, FTIR, and acidity-basicity measurements. The catalytic activity of the materials was tested versus the fructose dehydration in water solution at two di…
Productive and vegetative responses of 'Gala' and 'Fuji' apple trees under controlled irrigation strategies
2008
We investigated the productive and vegetative responses of ‘Gala’ and 'Fuji' apple (Malus domestica Borkh.) trees to deficit irrigation and partial rootzone drying under the dry climate of central Sicily. Soil water tension (SWT), stomatal conductance, yield, fruit quality, fruit growth, and shoot extension of conventionally irrigated trees (CI), where drip emitters on both sides of each tree were left open, were compared to that of partial rootzone drying (PRD) trees, where only one side of the rootzone was irrigated for the entire season (receiving 50% of the CI irrigation water), and to that of deficit irrigated (DI) trees, where drip emitters on both sides of the rootzone were deliverin…
Ftalocyjaniny – potęga możliwości
2015
Od momentu odkrycia ftalocyjaniny cieszą się ogromnym zainteresowaniem. Przypadkowe odkrycie w 1928 roku na terenie szkockiej fabryki, wywołało lawinę pytań odnośnie ich struktury i możliwości jej modyfikacji. Jak dotąd otrzymano kilkadziesiąt pochodnych ftalocyjanin, różniących się właściwościami i mogących znaleźć zastosowanie w różnych dziedzinach życia. Właściwości spektralne, które tłumaczą intensywną barwę roztworów ftalocyjanin, decydują o możliwości wykorzystywania tych związków jako barwników. Natomiast interesujące właściwości związane z transferem energii zostały wykorzystane w medycynie do leczenia nowotworów jako fotosensybilizatory w fotodynamicznej terapii – PDT. Rośnie równi…
Electrooxidation of methyl alcohol with Ni-Co catalyst
2018
Due to development of the renewable energy sources, the powering of fuel cells (FCs) with bio-fuels is very important. The one of this fuel is methyl alcohol. The use of fuel cells on a large scale is mainly limited by the high cost of catalysts – mainly platinum. Elimination of Pt as catalyst would allow for wider commercial application of FCs. The paper presents a study of methyl alcohol electrooxidation on electrode with NiCo alloy catalyst. Researches were done by the method of polarizing curves of electrooxidation of methanol in glass vessel. Conducted measurements show that there is a possibility of electrooxidation of methanol with Ni-Co catalyst. In any case, the process of electroo…
Methanol electrooxidation with Cu-B catalyst
2016
In the last few years alternative energy sources have been fast developing. One of these sources is fuel cell. Due to development of the renewable energy sources, the powering of fuel cells with bio-fuels is very important. The one of this fuel is methanol. The use of fuel cells on a large scale is mainly limited by the high cost of catalysts - mainly platinum. Elimination of Pt as catalyst would allow for wider commercial application of fuel cells. The paper presents a study of methanol electrooxidation on electrode with Cu-B alloy catalyst. Researches were done by the method of polarizing curves of electrooxidation of methanol in glass vessel. An aqueous solution of KOH was used as the el…
Possibility of using NiCO2O4 alloy as catalyst for fuel electrode of hydrazine fuel cell
2016
The work presents a possibility of the use of NiCo2O4 alloys as catalysts for electrooxidation of hydrazine. The research was done by the method of polarizing cuvers of electrooxidation of hydrazine in glass vessel in aqueous solution of KOH, on electrode with NiCo2O4 alloy as a catalyst. Conducted measurements show that there is a possibility of electrooxidation of hydrazine on NiCo2O4 electrode. The current density is low, but the price of the catalyst is much lower than platinum.