Search results for "Trap"

Tecnica di reimpianto mediante supporto biodegradabile.

2014

Tecnica di reimpianto mediante griglie metalliche

2014

Selezione di aree per il reimpianto di Posidonia oceanica mediante modello multicriteriale ed impianti pilota

2014

Generation of Earth's early continents from a relatively cool Archean mantle

2019

This research has been supported by DFG grant, SPP 1833 Building a Habitable Earth and MAGMA Consolidator Grant (ERC project #71143). Several lines of evidence suggest that the Archean (4.0 2.5 Ga) mantle was hotter than today's potential temperature (TP) of  1350 ° C. However, the magnitude of such difference is poorly constrained, with TP estimation spanning from 1500 ° C to 1600 ° C during the Meso‐Archean (3.2‐2.8 Ga). Such differences have major implications for the interpreted mechanisms of continental crust generation on the early Earth, as their efficacy is highly sensitive to the TP. Here, we integrate petrological modeling with thermomechanical simulations to understand the dynami…

Derivation of high-resolution leaf area index maps in support of validation activities: Application to the cropland Barrax site

2009

The validation of coarse satellite-derived products from field measurements generally relies on up-scaling the field data to the corresponding satellite products. This question is commonly addressed through the generation of a reference high-resolution map of an area covering several moderate resolution pixels. This paper describes a method by which reference leaf area index (LAI) maps can be generated from ground-truth LAI measurements. The method is based on a multivariate ordinary least squares (OLS) algorithm which uses an iteratively re-weighted least squares (IRLS) algorithm. It provides an empirical relationship (i.e. a transfer function) between in situ measurements and concomitant …

Photomagnetic properties of an Iron(II) low-spin complex with an unusually long-lived metastable LIESST state

2007

A comprehensive study of the photomagnetic behavior of the [Fe(L222N5)(CN)2].H2O complex has been carried out. This complex is characterized by a low-spin (LS) iron(II)-metal center up to 400 K and exhibits at 10 K the well-known Light-Induced Excited Spin State Trapping (LIESST) effect. The critical LIESST temperature (T(LIESST)) has been measured to be 105 K. The kinetics of the transition from the metastable high-spin (HS) state to the low-spin state have been determined and used for reproducing the experimental T(LIESST) curve. This study represents a second example of a fully low-spin iron(II)-metal complex up to 400 K, which can be photoexcited at low temperature with an atypical long…

Amuleti scursuna in corallo

2021

Some amulets in the shape of sea animals/monsters, called scursuna, have received little attention in scientific studies of the coral red works of the Trapani craftsmen of the late 18th and 19th centuries. These are not only fascinating artefacts because of the curiosity that coral and the symbolic universe to which it refers still arouse today, but they also hold an intrinsic interest on two levels: the first, easily intuitable, linked to popular customs and beliefs, and the second as an artistic manifestation to be related to the historicist eclecticism that also affected Sicilian decorative arts during the 19th century.

Capolavori trapanesi in corallo del XVII e del XVIII secolo a Malta

2013

L’articolo analizza preziose opere trapanesi in corallo del XVII e del XVIII secolo, in particolare ostensori e capezzali, che oggi si trovano a Malta, in collezioni private, ecclesiastiche e in musei dell’Isola. Tali manufatti, alcuni dei quali inediti, rappresentano un’ulteriore conferma della committenza aulica, della destinazione internazionale e dell’ampia diffusione mediterranea che tra il Seicento e il Settecento ebbe il corallo lavorato a Trapani. The article analyzes precious coral works of art of the seventeenth and eighteenth centuries from Trapani, in particular monstrances and bolsters, which today are found in Malta, in private and ecclesiastical collections, and in museums of…

The barrier height of the F+H2 reaction revisited: coupled-cluster and multireference configuration-interaction benchmark calculations.

2008

Large scale coupled-cluster benchmark calculations have been carried out to determine the barrier height of the F+H2 reaction as accurately as possible. The best estimates for the barrier height of the linear and bent transition states amount to 2.16 and 1.63 kcal/mol, respectively. These values include corrections for core correlation, scalar-relativistic effects, spin-orbit effects, as well as the diagonal Born-Oppenheimer correction. The CCSD(T) basis-set limits are estimated using extrapolation techniques with augmented quintuple and sextuple-zeta basis sets, and remaining N-electron errors are determined using coupled-cluster singles, doubles, triples, quadruples calculations with up t…

Basis-set extrapolation techniques for the accurate calculation of molecular equilibrium geometries using coupled-cluster theory

2006

To reduce remaining basis-set errors in the determination of molecular equilibrium geometries, a basis-set extrapolation (BSE) scheme is suggested for the forces used in geometry optimizations. The proposed BSE scheme is based on separating the Hartree-Fock and electron-correlation contributions and uses expressions obtained by straightforward differentiation of well established extrapolation formulas for energies when using basis sets from Dunning's hierarchy of correlation-consistent basis sets. Comparison with reference data obtained at the R12 coupled-cluster level [CCSD(T)-R12] demonstrates that BSE significantly accelerates the convergence to the basis-set limit, thus leading to impro…