Two caesium vanadium hydrogenphosphates with tunnelled structures: Cs2V2O3(PO4)(HPO4) and Cs2[(VO)3(HPO4)4(H2O)].H2O

International audienceDicaesium divanadium trioxide phosphate hydrogenphosphate, Cs2V2O3(PO4)(HPO4), (I), and dicaesium tris[oxidovanadate(IV)] hydrogenphosphate dihydrate, Cs2[(VO)3-(HPO4)4(H2O)] H2O, (II), crystallize in the monoclinic system with all atoms in general positions. The structures of the two compounds are built up from VO6 octahedra and PO4 tetrahedra. In (I), infinite chains of corner-sharing VO6 octahedra are connected to V2O10 dimers by phosphate and hydrogenphosphate groups, while in (II) three vanadium octahedra share vertices leading to V3O15(H2O) trimers separated by hydrogenphosphate groups. Both structures show three-dimensional frameworks with tunnels in which Cs+ cations are located

The Willingness to Pay for Cider Products: Results of a Survey on Habits and Consumption Behavior

Purpose : The objective of the paper is to investigate the impact of habits and consumption behavior on the willingness to pay (WTP) for cider by surveying young consumers. Method : The analysis is based on a questionnaire distributed to a group of 433 French business students from December 2017 to January 2018. Specifically, the questionnaire is designed to test whether young consumers would pay a premium price or not for quality ciders with respect to a traditional sweet cider with similar characteristics. We are modelling the premium that consumers are willing to pay for an organic cider, a farmer cider and rosé cider. To accommodate the feature of a significant proportion of zero or negative premiums in dependent variables, the Heckman two-stage estimation procedure is performed. Results : Results show that the young generation consider cider as a cheap, festive and non-organic beverage and is willing to pay a premium for quality ciders like specifically rosé and farmer ciders. Conclusion : The results from this research have useful implications not only for the cider market but also in the understanding of the characteristics of competitive beverages that young consumers may prefer and value

Rationalization of solid-state NMR multi-pulse decoupling strategies : coupling of spin I = ½ and half-integer quadrupolar nuclei

This work benefited from a grant from Agence Nationale de la Recherche (ANR MOSAIC 13-BS08-0018-01).In this paper we undertake a study of the decoupling efficiency of the Multiple-Pulse (MP) scheme, and a rationalization of its parameterization and of the choice of instrumental set up. This decoupling scheme is known to remove the broadening of spin-1/2 spectra I, produced by the heteronuclear scalar interaction with a half-integer quadrupolar nucleus S, without reintroducing heteronuclear dipolar interaction. The resulting resolution enhancement depends on the set-up of the length of the series of pulses and delays of the MP, and some intrinsic material and instrumental parameters. Firstly through a numerical approach, this study investigates the influence of the main intrinsic material parameters (heteronuclear dipolar and J coupling, quadrupolar interaction, spin nature) and instrumental parameters (spinning rate, pulse field strength) on efficiency and resolution enhancement of the scalar decoupling scheme. A guideline is then proposed to obtain quickly and easily the best resolution enhancement via the rationalization of the instrumental and parameter set up. It is then illustrated and tested through experimental data, probing the efficiency of MP-decoupling set up using this guideline. Various spin systems were tested (31P-51V in VOPO4, 31P-93Nb in NbOPO4, 119Sn-17O in Y2Sn2O7), combined with simulations results.PostprintPostprintPeer reviewe

Catena-(bis((1,10-Phenanthroline-N,N')-copper(II)) hydroxy-bis( phosphato)-tris(dioxo-vanadium(v))): a polymorphic phase driven by disorder.

International audienceIn the present paper a copper(II) phosphovanadate is presented and formulated as [Cu6(phen)6(VVO2)6(PO4)6(VVO2HO)3] (1a). This compound was obtained by hydrothermal synthesis and crystallizes in the triclinic group P-1, with a = 10.6290(5), b = 17.4275(8), c = 23.6151(11) Å; α = 92.888(4)°, β = 98.910(4)° and γ = 91.995(4)°. The leitmotif in (1a) is almost identical to some previously reported ones, viz. [Cu(phen)(VVO2)(PO4)]2[VVO2(OH)] (2); [Cu(phen)(VVO2)(PO4)]2[VIVO2(H2O)] (3) except for the fact that the small cells found in (2)-(3) are tripled in (1a). The reasons driving to these differences are subtle, and reside in the way in which the disorder in some vanadate groups takes place, viz., completely at random in (2)-(3) thus leading to a small "average" cell, while keeping some systematics in (1a) thus needing for a larger motif to take account of its repetition scheme in the crystal. The magnetic unit in the structure of (1a) is defined by a dinuclear system of CuII bonded by a μ2,η1-PO4 bridge. A fit of the corresponding magnetic data of (1a) was done, using the van Vleck equation for two S = ½ centres View the MathML source. The parameters obtained by the fit of the experimental data were g = 2.1 and J = −3.5 cm−1

SR120819A, an orally-active and selective neuropeptide Y Y1 receptor antagonist

AbstractAn orally-active antagonist of neuropeptide Y (NPY) Y1 receptors, SR 120819A, has been characterized. This compound displays highly selective and competitive affinity for rat, guinea-pig and human (Ki = 15 nM) NPY Y1 receptors. In vitro, SR 120819A blocks the inhibitory effect of NPY on adenylyl cyclase activity in human SK-N-MC cells and that of the selective Y1 agonist, [Leu31,Pro34]NPY, on rabbit vas deferens contraction (pA2 = 7.20 ± 0.07). In vivo, by intravenous route, this compound acts as an antagonist in anesthetized guinea-pigs and, notably, after oral administration, SR 120819A counteracts the pressor response of [Leu31,Pro34]NPY (5 μg/kg i.v.) with a long duration of action (>4 h at 5 mg/kg p.o.). Thus, SR 120819A is the first orally-effective NPY Y1 receptor antagonist yet descrobed. It could be a useful tool for exploring the role of NPY and the therapeutic relevance of an antagonist at NPY Y1 receptors

Did wine consumption change during the Covid-19 lockdown in France, Italy, Spain, and Portugal?

This article documents how the COVID-19 crisis has affected the drinking behavior of Latin European wine consumers. Using a large online survey conducted during the first lockdown inFrance, Italy, Portugal, and Spain (n= 7,324 individuals), we reconstruct the purchasing and consumption patterns of the respondents. The number of people who maintained their wine consumption frequency is significantly higher than those who increased or decreased their consumption. Wine consumption frequency held up better than other types of alcohol (beer andspirits). We analyze heterogeneities among countries and individuals by employing the Marascuilo procedure and an ordered logit model. The latter identifies the impact of demographic, commercial, and psychosocial factors on wine consumption frequency. The results shed light on changes in wine consumer behavior during the first lockdown and consider possible post-lockdown trends that could be useful to industry players

Dynamics of the global fine art market prices

This article examines the short- and long-run linkages among art market indexes between 1998 and 2016 using cointegration procedures, the Granger noncausality test and the Error Correction Model. These art indexes are examined by category: global, art method, time, and currency/country. The results indicate that there are a few causal linkages between art market indexes, notably that there is feedback between a few markets. These moderate causal links between art market indexes would indicate that there are many opportunities for diversification for practitioners, investors and collectors

Structural vector error correction modelling of Bitcoin price

Over the period from January 2011 to December 2019 we analyze the impact of shocks on the financial markets of emerging and developed countries on the price of Bitcoin using the structural vector error correction model. Results differ according to the duration and area selected. There is evidence of higher impact in short-term than in long-term. In the short term, bitcoin prices are positively influenced by Asian emerging countries and all countries areas, negatively by North America. In the long term, only all countries in Asia, the Pacific (negative) and Europe (positive) impact the price of bitcoin. Regardless of the duration, there is no influence of shocks in all other zones on the price of Bitcoin. The analysis of the health shock of COVID-19 and its impact on financial markets supports the results found. The results are potentially useful to academics, practitioners, and Bitcoin market participants to better facilitate risk-management-decisions