Search results for "MOBILITY"
showing 10 items of 922 documents
Uptake and translocation monitoring of imidacloprid to chili and tomato plants by molecularly imprinting extraction - ion mobility spectrometry
2019
Abstract The degradation of imidacloprid in soil and its uptake and translocation to chili and tomato plants was evaluated, as a proof of concept, of the possibilities of the combination of molecularly imprinted polymers (MIPs) and ion mobility spectrometry (IMS) for a fast and sensitive bioprocesses monitoring tool. To do it, a method based on the selective extraction of imidacloprid from soil and plant materials was developed. In the selected conditions, the MIP-IMS procedure provided a recovery of imidacloprid in soil and plant samples from 102 to 114%, for spiked concentration levels from 0.2 to 2.0 μg g−1. Precision of the methodology, expressed as the relative standard deviation (RSD)…
Determination of the new psychoactive substance dichloropane in saliva by microextraction by packed sorbent – Ion mobility spectrometry
2018
Abstract A simple procedure based on microextraction by packed sorbent (MEPS) has been proposed for the extraction of dichloropane in oral fluids and its determination by ion mobility spectrometry (IMS). Extraction conditions such as type of sorbent (octyl and octadecyl silica), sample pH, number of sample loadings, and elution volume were evaluated to obtain the most appropriate values. Dichloropane was extracted from saliva samples using C8 MEPS, loading with 100 μL sample (adjusted to pH 7) in 4 cycles, washing with 100 μL deionized water, and eluting with 50 μL 2-propanol in 10 cycles. The proposed MEPS procedure has been validated in terms of linearity, accuracy, and precision. A limit…
Fast extraction of cannabinoids in marijuana samples by using hard-cap espresso machines
2018
Abstract A simple, quick and low cost procedure was developed for the extraction of Δ9-tetrahydrocannabinol, cannabidiol, and cannabinol from marijuana samples, based on the use of a hard-cap espresso extraction with 2-propanol. After extraction, cannabinoids were directly determined after appropriate dilution by gas-chromatography-mass spectrometry, reaching a limit of detection from 0.03 to 0.05 mg g−1. Extraction efficiency was evaluated by the comparison of results obtained for seized samples by the proposed method and a reference methodology based on ultrasound-assisted extraction. Moreover, ion mobility was proposed for the rapid and sensitive determination of Δ9-tetrahydrocannabinol …
Structural, vibrational and electrical study of compressed BiTeBr
2016
Compresed BiTeBr has been studied from a joint experimental and theoretical perspective. Room-temperature x-ray diffraction, Raman scattering, and transport measurements at high pressures have been performed in this layered semiconductor and interpreted with the help of ab initio calculations. A reversible first-order phase transition has been observed above 6–7 GPa, but changes in structural, vibrational, and electrical properties have also been noted near 2 GPa. Structural and vibrational changes are likely due to the hardening of interlayer forces rather than to a second-order isostructural phase transition while electrical changes are mainly attributed to changes in the electron mobilit…
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…
Caracterización de las áreas urbanas gallegas en función de los flujos de movilidad obligada
2010
La realidad territorial en los municipios gallegos evolucionó a ritmos dispares, afectados por dinámicas muy diferentes en cada uno de los casos. Los problemas en la aplicación de la normativa urbanística y de los instrumentos técnicos para la gestión del suelo gestaron unos ámbitos urbanos desconectados de su realidad metropolitana. Las áreas de influencia en las ciudades de Galicia presentan modelos complejos, adaptados a las dificultades que les privaron de una gestión prudente y coherente de los nuevos territorios urbanos. En la evaluación de la nueva realidad urbana, de sus condiciones y características, la movilidad residencial y la recurrente diaria es un elemento de primer rango de …
Impact of wage penalty on mobility return of French PhDs
2015
International audience; Expatriation of higher-education graduates raises much concern in many countries often in conjunction with talk about the brain drain. It supposedly entails a risk of losing the skills required for a competitive economy. The issue is all the more acute for PhD graduates, who are expected to play a major part in the knowledge economy. However, questions arise as to the causes of such mobility and its consequences for young graduates' individual career paths.
Analysis of hazardous chemicals by “stand alone” drift tube ion mobility spectrometry: a review
2020
Ion mobility spectrometry (IMS) is a widely used technique based on gas phase ion separation under an electric field by differences in ion mobilities. In the last decade, IMS techniques have received increased attention due to their high operational speed and sensitivity. Currently, there are different IMS devices focused on solving different analytical performances, mainly based on linear drift tube (DT IMS), traveling wave, and field asymmetric waveform ion mobility spectrometers. In this review we summarize the main applications of DT-IMS devices for the determination of semi-volatile hazardous chemicals such as: illegal drugs, pesticides, explosives, chemical warfare agents, and others,…
Crystal Structure and Local Dynamics in Tetrahedral Proton-Conducting La1-xBa1+xGaO4
2010
La1-xBa1+xGaO4-0 (LBG) compounds, based on unconnected GaO4 moieties, were recently proposed as proton conductors. Protonic defects in the lattice are inserted through self-doping with Ba2+, to create oxygen vacancies subsequently filled by hydroxyl ions. We present a combined structural analysis on self-doped LBG using X-ray diffraction (XRD) and X-ray absorption (EXAFS): these results unravel the finer structural details on the short-range and long-range scales, and they are correlated with the dynamical properties of protonic conduction coming from vibrational spectroscopy. The structure of the GaO4 groups is independent of the oxide composition. On hydration, an array of short intertetr…
The Effects of Taxation on Migration: Some Evidence for the ASEAN and APEC Economies
2010
This paper investigates the effects of taxation on migration. It develops a stylized, two-country model to examine the impact of taxes on labor mobility. The theoretical predictions that taxes affect migration decisions and that educated workers are more responsive to taxation are supported by some empirical evidence for the economies of the Association of Southeast Asian Nations and the Asia-Pacific Economic Cooperation. The empirical application also shows that average tax rates have a larger impact on migration choices than marginal rates. Average tax rates are most important for migrants with secondary education, while marginal rates have a greater influence on the decisions of migrants…