Search results for "Exchange"
showing 10 items of 2035 documents
Determinación de residuos de paraquat en lechuga y repollo cultivados en Lepaterique mediante HPLC-DAD
2018
La determinación de residuos del herbicida paraquat en lechuga (Lactuca sativa) y repollo (Brassica oleracea) producidos en la comunidad de La Brea, Lepaterique y comercializados en la ciudad de Tegucigalpa fue llevada a cabo en los meses de octubre y noviembre de 2017, mediante la aplicación de cromatografía líquida de elevada resolución con detector de arreglo de diodos (HPLC-DAD) en menos de 6 minutos, con un mecanismo de separación de fase reversa empleando una columna superficialmente porosa C18 y una mezcla de ácido orto fosfórico al 0.1 M (pH 3,0) con acetonitrilo en proporción de 3:1 como fase móvil. El método se basa en la extracción con baño ultrasónico utilizando agua como solven…
Determination of glyphosate and aminomethylphosphonic acid in natural water using the capillary electrophoresis combined with enrichment step
2005
A previously elaborated capillary electrophoresis (CE) method used for the determination of glyphosate and aminomethylphosphonic acid (AMPA) was slightly modified in order to improve the sensitivity. However, detection limits attained (5 μg mL−1 for glyphosate and 4 μg mL−1 for AMPA) were still not satisfactory for analytical purposes, thus the addition of a preconcentration step before the CE analysis was proposed. AMBERLITE®IRA-900, a strong anion-exchange resin, was used to preconcentrate both analytes in environmental aqueous samples. The experimental conditions optimised in a previous work were readapted, by decreasing the eluent concentration due to CE limitations. Satisfactory result…
The biological activity of bacteriophage DNA, prepared by the cationic detergent dilution technique
1975
Abstract The preparation of phage lambda DNA infecting E. coli K 12 with cationic detergent is described. This DNA infects E. coli spheroblasts with the same efficiency as DNA prepared by phenol methods.
Análisis de la sostenibilidad del sector exterior en la OCDE con técnicas de multicointegración
2022
Este artículo analiza la sostenibilidad externa de un grupo de 23 países de la OCDE durante el periodo 1970-2020. La estrategia empírica adoptada muestra la importancia del desequilibrio acumulado como desencadenante del ajuste externo, en línea con la propuesta de Gourinchas y Rey (2007). Para ello, contrastamos la sostenibilidad externa a través de la relación acumulado-flujo entre las variables que representan las relaciones externas de una economía abierta utilizando varios tipos de contrastes de cointegración y multicointegración. Los resultados obtenidos apuntan hacia la sostenibilidad en sentido débil en el análisis de los flujos, mientras que desde el punto de vista del enfoque acum…
Forecasting the diffusion of hydrogen EV refuelling infrastructures in Italy
2019
In Italy the electric vehicle revolution is arrived but it still has difficulties to take off. At the moment hybrid technology would seem the most quoted, due especially to range anxiety. The aim of this work is to understand if the fuel cell technology can find place in Italy. The possibility to use fuel cell to storage electric energy is quite interesting: the charging times will be reduced, and heavy passenger transportation should be easily faced. Basing on the existing history and analysis of the information accessible, this paper addresses the existing e-mobility scenario in Italy and predicts the cities in which a hydrogen refuelling infrastructure should be more remunerative, in ord…
The Insolvency of Cryptocurrency Exchanges: Lessons from the BitGrail Case — Reification of Coins, Pari Passu Ranking, and Nominalism
2019
This paper deals with a recent trend in insolvency of cryptocurrency platforms; comments on the BitGrail case (Court of Florence 17/2019, 21 January 2019) and argues that this decision balances the need to grant legal protection to the injured users and the need to prevent them from having the status of owners, jumping the queue and getting a head start over the other creditors of the platform.
Competition between inter- and intra- molecular energy exchanges in a simple quantum model of a dimer
2006
Abstract We propose a fully quantum model to describe the dynamics of a possible radiationless energy transfer process between identical and nearly localized molecules or monomers coupled through a dipole–dipole term. The system is studied as an environmentally isolated dimeric pair and we find that its dynamics exhibits a competition between the process ruling out the transfer of energy among different degrees of freedom of a given monomer and the one steering the intermolecular passage of excitations from a monomer to the other one. Such a competition is quantitatively characterized investigating on the temporal behaviour of quantum covariances of some couples of appropriate observables h…
Electron paramagnetic resonance study of exchange coupled Ce3+ ions in Lu2SiO5 single crystal scintillator
2016
Abstract The Ce 3+ ions incorporation inside lutetium oxyorthosilicate (Lu 2 SiO 5 ) single crystals was studied by electron paramagnetic resonance. Already known Ce1 and Ce2 centers originating from the lattice peculiarity allowing two lutetium sites coordinated by different number of the oxygen ions were detected. Remarkably, for the Ce2 center, the determined g 2 tensor is asymmetric and could not be diagonalized as compared to the Ce1 center, for which the three principal values and corresponding axes orientation have been determined and reported previously. Besides, the much weaker resonance lines found in spectra close to those coming from the Ce1 and Ce2, and following them under cry…
The magnetic resonance of Gd3+ in Gd2Se3 near the phase transition and up to 300 K
1985
Temperature dependences of the width of the Gd2Sc3 ESR lines are investigated. The observed width is satisfactory explained by a dipole mechanism narrowed by exchange interaction. Changes of the Gd2Se3 ESR line at T = 6 K are due to antiferromagnetic ordering in the sample. Es wird die Temperaturabhangigkeit der ESR-Linienbreite von Gd2Se3 untersucht. Die beobachtete Breite wird durch einen Dipolmechanismus mit Verschmelzung durch Austauschwechselwirkung beschrieben. Anderungen der Gd2Se3-ESR-Linie bei T = 6 K werden infolge antiferromagnetischer Ordnung in der Probe hervorgerufen.
Regional Income Inequality in Spain 1860–2015
2018
How has regional economic inequality evolved since 1860? Is there a relationship between initial per-capita income and regional growth rates? Is there any relation between the evolution of regional inequality and the economic development process in Spain? In order to answer these questions, a number of different indicators of inequality are offered in this chapter. Then the patterns of convergence or divergence followed by Spanish regions from the mid-nineteenth century to the present are studied. Regional income inequality rose in the early stages of economic development and then declined. However, with high levels of development, around the 1980s, a change of trend is observed. In other w…