Search results for "element"

Inside Cover: Hydrogen-Bonded Open-Framework with Pyridyl-Decorated Channels: Straightforward Preparation and Insight into Its Affinity for Acidic Mo…

2017

International audience; A hydrogen-bonded open framework with pores decorated by pyridyl groups was constructed by off-charge-stoichiometry assembly of protonated tetrakis(4-pyridyloxymethyl)methane and [Al(oxalate)(3)](3-), which are the H-bond donor and acceptor of ionic H-bond interactions, respectively. This supramolecular porous architecture (SPA-2) has 1nm-large pores interconnected in 3D with large solvent-accessible void (53%). It demonstrated remarkable affinity for acidic organic molecules in solution, which was investigated by means of various carboxylic acids including larger drug molecules. Competing sorption between acetic acid and its halogenated homologues evidenced good sel…

Recensione di Berndt, Annette (a cura di) (2013), Fremdsprachen in der Perspektive lebenslangen Lernens. Frankfurt M.: Peter Lang

2014

The pentafluorophenyl group as π-acceptor for anions: a case study

2015

Chemical science 6(1), 354-359 (2015). doi:10.1039/C4SC02762K

Partial Discharges in HVDC Cables - The Effect of the Temperature Gradient During Load Transients

2021

The paper investigates the role of the space charge accumulation phenomena in the inception of Partial Discharges (PD) in a defect within the bulk of the dielectrics of a High Voltage Direct Current (HVDC) cable. It is widespread accepted that the number of PD occurring in an HVDC cable during its lifetime is largely less than that under AC voltage stress. This is essentially due to higher values of the voltage between the conductor and the screen needed to trigger PD under a steady DC voltage than the same value under AC stress. Nevertheless, due to the dependency of the electrical conductivity of the insulation on the electric field and temperature, PD in HVDC cables is strongly influence…

An Innovative Coupling Solution for Power Line Communication in MV Electrical Networks

2019

One of the main problems in the diffusion of power line communication (PLC) in medium voltage (MV) networks is the need of a dedicated PLC coupler to be installed all over the network. To avoid this problem, the authors have studied, prototyped and patented an innovative PLC coupling solution which uses electrical elements embedded in most of the switchgears already installed in MV networks, i.e. the capacitive dividers of the voltage detecting systems (VDS). The new solution prototype is described in this paper, highlighting the advantages in terms of a significant reduction of both direct costs of equipment and infrastructures and indirect costs of installation and service interruption. T…

Huit objets de cuivre et de bronze du piémont pyrénéen oriental : analyse croisée typologique et métallique

2015

Cet article porte sur huit pièces à base de cuivre – deux haches plates et six poignards – provenant de la zone sous-pyrénéenne orientale (Corbières, Haute Vallée de l’Aude, Pays d’OImes), dans les départements de l’Aude et de l’Ariège de l’Est (région de Lavelanet). Elles sont décrites et replacées dans leur contexte typochronologique, alors que les aspects technoéconomiques sont envisagés via la composition métallique (composition élémentaire et rapports isotopiques du plomb). Cinq objets en cuivre – deux haches et trois poignards – sont attribués au Chalcolithique. L’une des haches se rapproche des types nord-ibériques et son importation depuis cette région est suggérée par les analyses …

Effect of Hot Dip Galvanized Steel Surface Chemistry and Morphology on Titanium Hexafluoride Pretreatment

2017

Titanium hexafluoride pretreatments are known to improve paint adhesion and function as a barrier between the coating and the hot dip galvanized (HDG) steel surface. Interactions at the zinc/pretreatment interface are of utmost importance for the formation of pretreatment layers and the corrosion resistance of color coated hot dip galvanized steels. Removal rate of inert aluminum oxide from HDG steel samples by chemical dissolution was studied. XPS measurements showed that the surface Al2O3 layer thickness decreased rapidly already at mild alkaline cleaning, while complete removal of Al required severe etching. Low reactivity of an Al2O3-rich surface was confirmed by impaired formation of a…

Priming effect increases with depth in a boreal forest soil

2016

Abstract Climate warming increases labile carbon (C) inputs to soil through increased photosynthesis and C allocation belowground. This could counterintuitively lead to losses of soil C via priming effects (PE): the stimulation of soil organic matter (SOM) decomposition caused by labile C addition. Systematic quantification of PEs in different ecosystems is needed. We measured PEs of free-living soil microbes in different layers of a boreal forest soil, and found that the relative magnitude of the PE increased with soil depth. The relationship between relative PE and the added glucose amount also depended on the soil layer. Our results indicate that the decomposition of SOM in deeper soil l…

Juridiskajām personām piemērojamo piespiedu ietekmēšanas līdzekļu aktualitātes un pārrobežu elementa ietekme uz procesu

2020

Bakalaura darbs “Juridiskajām personām piemērojamo piespiedu ietekmēšanas līdzekļu aktualitātes un pārrobežu elementa ietekme uz procesu” tika izstrādāts ar mērķi apzināt gadījumus, kuros var piemērot piespiedu ietekmēšanas līdzekļus juridiskām personām Latvijas krimināltiesību regulējumā, apskatīt Kriminālprocesa likuma grozījumu nepieciešamību, pastiprinot atbildības tvērumu juridiskajām personām un izvērtēt, kā juridiskās personas kriminālatbildības neīstenotā iecere saskan ar mūsdienu regulējumu. Piespiedu ietekmēšanas līdzekļu piemērošanas process juridiskām personām Latvijas krimināltiesiskajā regulējumā pastāv jau kopš 2005.gada, tomēr praksē arvien rodas jaunas problēmsituācijas. Au…

Characterisation and Provenance of Archaeological Lithic Materials by Chemical Methods

2022

Esta tesis doctoral se ha realizado mediante un compendio de cinco trabajos publicados en revistas internacionales indexadas que incluyen los estudios arqueométricos de caracterización química llevados a cabo sobre los materiales arqueológicos de tipo lítico siguientes: las materias primas silíceas de la Comunidad Valenciana y los artefactos en sílex de la Cueva de la Cocina (Dos Aguas, Valencia), los materiales de construcción de la antigua ciudad de Sagunto y de su Castillo (morteros y sillares de roca carbonatada), y las ánforas conservadas en el Museo Arqueológico de Sagunto. En todos los estudios hemos desarrollado y optimizado enfoques basados en la caracterización de los materiales a…