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排序方式: 共有460条查询结果,搜索用时 15 毫秒
61.
62.
Garra Ricard Leibenger Dominik Miret Josep M. Sebé Francesc 《International Journal of Information Security》2019,18(5):637-646
International Journal of Information Security - Smart meters inform the electricity suppliers about the consumption of their clients in short intervals. Fine-grained electricity consumption... 相似文献
63.
An Unprecedented Stimuli‐Controlled Single‐Crystal Reversible Phase Transition of a Metal–Organic Framework and Its Application to a Novel Method of Guest Encapsulation 下载免费PDF全文
Fangchang Tan Ana López‐Periago Mark E. Light Jordi Cirera Eliseo Ruiz Alejandro Borrás Francesc Teixidor Clara Viñas Concepción Domingo José Giner Planas 《Advanced materials (Deerfield Beach, Fla.)》2018,30(29)
The flexibility and unexpected dynamic behavior of a third‐generation metal–organic framework are described for the first time. The synthetic strategy is based on the flexibility and spherical shape of dipyridyl‐based carborane linkers that act as pillars between rigid Co/BTB (BTB: 1,3,5‐benzenetricarboxylate) layers, providing a 3D porous structure ( 1 ). A phase transition of the solid can be induced to generate a new, nonporous 2D structure ( 2 ) without any loss of the carborane linkers. The structural transformation is visualized by snapshots of the multistep single‐crystal‐to‐single‐crystal transformation by single‐crystal and powder X‐ray diffraction. Poor hydrogen bond acceptors such as MeOH, CHCl3 or supercritical CO2 induce such a 3D to 2D transformation. Remarkably, the transformation is reversible and the 2D phase 2 is further converted back into 1 by heating in dimethylformamide. The energy requirements involved in such processes are investigated using periodic density functional theory calculations. As a proof of concept for potential applications, encapsulation of C60 is achieved by trapping this molecule during the reversible 2D to 3D phase transition, whereas no adsorption is observed by straight solvent diffusion into the pores of the 3D phase. 相似文献
64.
Montserrat Prez Francesc Torrades Xavier Domnech Jos Peral 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2002,77(5):525-532
The degradation of the organic content of a bleaching Kraft mill effluent was carried out using Advanced Oxidation Processes (AOPs). The study was focused on the identification of the AOP, or combination of AOPs, that showed the highest efficiency together with the lowest cost. Direct UV photolysis (UV), TiO2 assisted‐photocatalysis (TiO2/UV), Fenton, Fenton‐like, and photo‐Fenton reactions (Fe(II)/H2O/UV), UV‐assisted ozonation (O3/UV) and addition of Fe2+ and/or H2O2 to the TiO2/UV and the O3/UV systems, were used for the degradation of a conventional cellulose bleaching effluent. The effluent was characterized by the general parameters TOC, COD and color, and analyzed for chlorinated low molecular weight compounds using GC–MS. The costs of the systems per unit of TOC reduction were compared. Fenton, Fenton‐like and photo‐Fenton reactions achieved better levels of TOC degradation than photocatalysis and with lower cost's than photocatalytic treatments. Ozonation is an effective but rather expensive process. The use of UVA light, however, increased the effectiveness of ozonation with a significant decrease (>25%) in the operational cost. © 2002 Society of Chemical Industry 相似文献
65.
Cintia Ocampo Ramon Oliver Elaine Armelin Carlos Alemán Francesc Estrany 《Journal of Polymer Research》2006,13(3):193-200
Electrodeposition of poly(3,4-ethylenedioxythiophene) by electrochemical polymerization of 3,4-ethylenedioxythiophene has
been performed on steel electrodes rather than on the typically used inert electrodes (Pt, Au, graphite carbon). The polymer
was generated by cyclic voltammetry, chronopotentiometry and chronoamperometry from a 10 mM monomer solution in acetonitrile
with 0.1 M LiClO4. Elemental analysis of the generated polymer indicated that the monomeric units support 0.54 positive charges balanced with
CIO4
14− counterions. Electrochemical, electrical and structural properties of the prepared material have been characterized. The
good adherence of films combined with its excellent properties indicate that poly(3,4-ethylenedioxythiophene) can be a suitable
material for anticorrosion applications. 相似文献
66.
Elaine Armelin Ramón Oliver Francisco Liesa José I. Iribarren Francesc Estrany Carlos Alemán 《Progress in Organic Coatings》2007
Within coating technology, there is increasing interest in the development of efficient anticorrosive additives able to replace the conventional inorganic anticorrosive pigments usually added to paints, which may have detrimental effects on both environment and health. A number of recent studies have evidenced that the modification of a paint formulation by the addition of a low concentration of conducting polymer (0.2–0.3%, w/w) increases significantly the protective properties of the coating. Here we focus on the principles of anticorrosive additives based on conducting polymers for marine paints. The article reviews the most important findings achieved in recent studies. The relevant factors that are determinant for the anticorrosive protection imparted by conducting polymers, as the doping level, the miscibility with paint, the electrochemical stability, etc., are discussed in detail. 相似文献
67.
Francesc Valls Ernesto Redondo David Fonseca Ricardo Torres-Kompen Sergi Villagrasa Nuria Martí 《Telematics and Informatics》2018,35(4):1039-1052
The configuration of urban projects using Information and Communication Technologies is an essential aspect in the education of future architects. Students must know the technologies that will facilitate their academic and professional development, as well as anticipating the needs of the citizens and the requirements of their designs. In this paper, a data mining approach was used to outline the strategic requirements for an urban design project in an architecture course using a Project-Based Learning strategy. Informal data related to an award-winning public space (Gillett Square in London, UK) was retrieved from two social networks (Flickr and Twitter), and from its official website. The analysis focused on semantic, temporal and spatial patterns, aspects generally overlooked in traditional approaches. Text-mining techniques were used to relate semantic and temporal data, focusing on seasonal and weekly (work-leisure) cycles, and the geographic patterns were extracted both from geotagged pictures and by geocoding user locations. The results showed that it is possible to obtain and extract valuable data and information in order to determine the different uses and architectural requirements of an urban space, but such data and information can be challenging to retrieve, structure, analyze and visualize. The main goal of the paper is to outline a strategy and present a visualization of the results, in a way designed to be attractive and informative for both students and professionals – even without a technical background – so the conducted analysis may be reproducible in other urban data contexts. 相似文献
68.
Front Cover: Toward Angiogenesis Inhibitors Based on the Conjugation of Organometallic Platinum(II) Complexes to RGD Peptides (ChemMedChem 17/2018) 下载免费PDF全文
69.
Benthic diatom assemblages have been used to evaluate the water quality of two rivers subjected to marked human influences. These rivers, the Llobregat and the Ter, are located in N.E. Spain, and supply water for industrial, agricultural and urban requirements of roughly three million people. The diatom communities in the headwaters are similar in both rivers (Achnanthes minutissima, Cymbella ventricosa, Gomphonema anguslatum). Species of Navicula, Nitzschia and Gomphonema develop in the middle reaches of both rivers when not disrupted by extraneous factors. In the river Ter significant pollution modifies this community and Nitzschia palea, Nitzschia gandersheimiensis and Gomphonema parvulum appear as the most tolerant species. In the Llobregat, the pollution from the salt mine operations also modifies the diatom assemblage and Nitzschia frustulum, Surirella ovata, Navicula atomus are the most abundant species. Reservoirs in the river Ter improve the quality of water and a community of Fragilaria sp. pl. becomes dominant downstream. 相似文献
70.
M. Drif P.J. Prez J. Aguilera G. Almonacid P. Gomez J. de la Casa J.D. Aguilar 《Solar Energy Materials & Solar Cells》2007,91(8):670-683
Nowadays, grid connected photovoltaic (PV) systems are very popular in industrialized countries and can even be considered as the most promising PV application. The integration of these systems into urban buildings offers a large potential for cost reduction and can further increase the overall value of urban architecture. According to available statistics, by the end of 2002, more than 1.3 GWp of PV power was installed in industrialized countries world wide, which represents 70–85% of the total world capacity [J. Ohno, Progress in Photovoltaics: Research and Applications (2001) 471. [1]]. During recent years, a great number of European projects in the PV sector have been carried out in Spain. The Univer Project—UNIversidad VERde—is one of these European projects. It consists of four grid connected PV systems of fully integrated into the Jaén University buildings, in order to provide the University Campus with more than 8% of its electricity needs, i.e. 210 MWh/year.The aim of this paper is to present a general overview of the Univer Project and the performance analysis of its PV systems during their first phase of operation. 相似文献