Search results for "Exchange"
showing 10 items of 2035 documents
Banking in Spain
2016
This chapter aims to explore recent developments in the Spanish banking industry and the measures adopted in recent years to correct the imbalances that built up during the expansion, in order to give an up-to-date picture of the sector in the international context. To this end, the chapter is divided into four sections. The section following the Introduction examines the importance of the banking sector in the Spanish economy using various indicators of banking penetration. The next section, “Characteristics of the Spanish Banking Sector: Recent Trends”, looks at key features of the banking sector and its evolution in terms of a range of measures, including margins, profitability, efficien…
Evaluation of advanced silica packings for the separation of biopolymers by high-performance liquid chromatography
1989
Abstract The linear solvent strength model of Snyder was applied to describe fast protein separations on 2.1-μm non-porous, silica-based strong anion exchangers. It was demonstrated on short columns packed with these anion exchangers that (i) a substantially higher resolution of proteins and nucleotides was obtained at gradient times of less than 5 min than on porous anion exchangers; (ii) the low external surface area of the non-porous anion exchanger is not a critical parameter in analytical separations and (iii) μg-amounts of enzymes of high purity and full biological activity were isolated.
Cation exchange-based post-processing of 68Ga-eluate: A comparison of three solvent systems for labelling of DOTATOC, NO2APBP and DATAm
2014
Interest in (68)Ga has led to a number of innovations for its provision suitable for clinical application. Several post-processing methods are available to reduce eluate volume and remove metal trace impurities. In this work three cation exchange resin based post-processing methods (acetone, ethanol and NaCl) have been compared, using three model precursors (DOTATOC, NO2AP(BP) and DATA(m)), in terms of labelling yield and reproducibility. The acetone and ethanol based methods provided greater reproducibility and yields that makes subsequent purification unnecessary.
Design, characterization and evaluation of hydroxyethylcellulose based novel regenerable supersorbent for heavy metal ions uptake and competitive ads…
2017
Abstract Hydroxyethylcellulose succinate-Na (HEC-Suc-Na) was designed and evaluated for removal of some heavy metal ions from aqueous solution. Pristine sorbent HEC-Suc-Na was thoroughly characterized by FTIR and solid-state CP/MAS 13C NMR spectroscopy, SEM-EDS and zero point charge analyses. Langmuir isotherm, pseudo second order kinetic and ion exchange models provided best fit to the experimental data of sorption of metal ions. Maximum sorption capacities of supersorbent HEC-Suc-Na for sorption of heavy metal ions from aqueous solution as calculated by Langmuir isotherm model were found to be 1000, 909.09, 666.6, 588 and 500 mg g−1 for Pb(II), Cr(VI), Co(II), Cu(II) and Ni(II), respectiv…
Application of conductometric and pH metric measurements in determining the kinetics and equilibrium parameters of the heterophasic ion exchange: Met…
2019
The application possibilities of conductometric and pH metric measurements in the description of the process of heterophasic ion exchange have been analysed, between metal cation (Zn, Cu) - proton, which occurs according to the formula, M+ + HR ⇄ H+ + MR, where R is an anion permanently bound in the sorbent. Kinetic models of the pseudo-first and pseudo-second order reactions, as well as the Langmuir isotherm model which describes the process equilibrium, have been used in mathematical presentations. It was confirmed that conductometric and pH metric measurements are equally effective in the assessment of such processes' parameters, in comparison with the expensive method of determining met…
Influence of hydrogen cations on kinetics and equilibria of heavy-metal sorption by algae-sorption of copper cations by the alga
2012
The influence of hydrogen cations on kinetics and equilibria of sorption of copper cations by the marine alga Palmaria palmata (Linnaeus) Weber & Mohr was studied under static conditions. The competitive effect of the H+ cations is described, which influenced the uncertainty of evaluation of the alga sorption capacity. Under static conditions, the variation of the Cu2+/H+ concentration ratio during sorption was found nonmonotonic. The Langmuir isotherm model was used to determine the sorption capacity of the alga, namely 12.4 mg g−1 of dry algae mass. A similar value was determined from the kinetic parameters of the ionic exchange which is considered a pseudo-second-order chemical reaction.…
Soviet-American Art Exchanges during the Thaw: from Bold Openings to Hasty Retreats
2013
[Introduction] East-West artistic connections during the Cold War were a complex range of phenomena including the circulation of works of art, travelling by art professionals, the exchange of practices and the adoption of art currents from the other side of the Iron Curtain. The Cold War has also been said to have influenced the arts and artistic processes in a number of ways. Yet, art has always shunned political borders, wavering between the guidance of individual and governmental patrons, and borderless expression. This chapter discusses an attempt at an extensive exchange of exhibitions between the Soviet Union and the United States around the late 1950s that involved New York’s Museum …
The Western Space Policies under the Influence of International Factors: Mutuality of Russia’s Case
2015
The research is dedicated to the problem of mutual dependence in space policies between the West, represented by great spacefaring actors the US and the EU, and Russia. In the study the correlation analysis, content analysis, and scenario-building methods were used. The conclusion of the analysis comprises consideration on the need to invest in their independence by Western countries in order to avoid unnecessary extra dependence on uncertain and unreliable regimes that supply substantial components for their space technology.
Topology of correlation-based minimal spanning trees in real and model markets
2003
We present here a topological characterization of the minimal spanning tree that can be obtained by considering the price return correlations of stocks traded in a financial market. We compare the minimal spanning tree obtained from a large group of stocks traded at the New York Stock Exchange during a 12-year trading period with the one obtained from surrogated data simulated by using simple market models. We find that the empirical tree has features of a complex network that cannot be reproduced, even as a first approximation, by a random market model and by the one-factor model.
FUNCTIONALIZED HALLOYSITE NANOTUBES FOR ENHANCED REMOVAL OF Hg2+ IONS FROM AQUEOUS SOLUTIONS
2021
AbstractWater is essential for humans, animals, and plants; pollutants, usually derived from anthropogenic activities, can have a serious effect on its quality. Heavy metals are significant pollutants and are often highly toxic to living organisms, even at very low concentrations. Among the numerous removal techniques proposed, adsorption onto suitable adsorbent materials is considered to be one of the most promising. The objective of the current study was to determine the effectiveness of halloysite nanotubes (HNT) functionalized with organic amino or thiol groups as adsorbent materials to decontaminate polluted waters, using the removal of Hg2+ ions, one of the most dangerous heavy metals…