Search results for "RAV"

Influence de la symétrie et de la taille de la molécule adsorbée sur le processus d'adsorption des composés éthyléniques sur une zéolithe de topologi…

2005

This manuscript lies within the scope of the understanding of the stepped isotherm observed during adsorption, on MFI zeolites, of some organic compounds which have a similar size to that of the pore opening of zeolite. During this work, the process of adsorption of ethylene and tetramethylethylene is initially studied by gravimetry and then by in situ infrared spectroscopy. This last technique enables to follow simultaneously the modifications of the adsorbent and the adsorbate. The analysis of these data lets suppose that the step in adsorption isotherm can be explained by taking account simultaneously of the symmetry and the size of the admolecule. In addition to the infrared bands chara…

Aznar Traval, A.: Economía colaborativa, alojamiento y transporte, Thomson Reuters, Navarra, 2018.

2021

ADOLESCENZA, GRAVIDANZA E DINAMICHE INTERGENERAZIONALI. UNA RICERCA PILOTA SULLE RAPPRESENTAZIONI MENTALI

2008

On the carrier of inertia

2018

A change in momentum will inevitably perturb the all-embracing vacuum, whose reaction we understand as inertia. Since the vacuum's physical properties relate to light, we propose that the vacuum embodies photons, but in pairs without net electromagnetic fields. In this physical form the free space houses energy in balance with the energy of matter in the whole Universe. Likewise, we reason that a local gravitational potential is the vacuum in a local balance with energy that is bound to a body. Since a body couples to the same vacuum universally and locally, we understand that inertial and gravitational masses are identical. By the same token, we infer that gravity and electromagnetism shar…

Quantitative study of ANP in hypothalamic supraoptic and paraventricular nuclei in trained rats.

2008

Divulgazioni, plagi e incisioni di architettura nel Seicento europeo. Il caso della Bibbia di Melchior Küsel

2018

DIVULGAZIONI, “PLAGI” E INCISIONI DI ARCHITETTURA NEL SEICENTO EUROPEO. IL CASO DELLA BIBBIA DI MELCHIOR KÜSEL Nel 1908 la storica dell’arte austriaca Erika Tietze-Conrat pubblicava un articolo su sull’ Icones Biblicae Veteris et Novi Testamenti…, una bibbia illustrata edita ad Augsburg nel 1680 dall’incisore tedesco Melchior Küsel. La studiosa aveva colto come la peculiarità di questa Bilderbibel risiedesse non soltanto nelle 241 tavole che Küsel aveva inserito come corredo e sfondo delle molte storie tratte dal vecchio e dal nuovo testamento, quanto nella selezione delle fonti iconografiche. La quasi totalità delle incisioni non era frutto di invenzioni di Küsel che aveva realizzato nuovi…

Coronavirus Disease 2019–Associated Coagulopathy

2021

Patients with the severe form of coronavirus disease 2019 (COVID-19) have been frequently found to suffer from both arterial and venous thrombotic events due to the perpetuation of a hypercoagulable state. This phenomenon, termed COVID-19-associated coagulopathy (CC), is now considered a major component of the pathophysiology of this novel infectious disease, leading to widespread thrombosis. While at first, the vascular insults may be limited to the pulmonary microvasculature, as the disease progresses, systemic involvement occurs, culminating in distant organ thrombosis and multi-organ dysfunction syndrome. In this review article, we discuss recent insights into the pathophysiologic mecha…

Study of the electronic and atomic structure of thermally treated SrTiO3(110) surfaces

2003

The electronic structure of heated SrTiO3(110) surfaces was investigated with metastable impact electron spectroscopy and ultraviolet photoelectron spectroscopy (He(I). Scanning tunnelling microscopy and atomic force microscopy (AFM) were used to study the topology of the surface. The crystals were heated up to 1000 °C under reducing conditions in ultrahigh vacuum or under oxidizing conditions in synthetic air for 1 h, respectively. Under both conditions microfacetting of the surface is observed. The experimental results are compared with ab initio Hartree-Fock calculations, also presented here, carried out for both ideal and reconstructed SrTiO 3(110) surfaces. The results give direct evid…

Residual water and electrical properties of polyaniline

1994

Summary form only given. The work aims to study the mechanism of interaction between water molecules and polyaniline (PANI) backbone as an important constituent of acid-base transformations ensuring good conductive properties of PANI. Experiments have been made using chemically synthesized emeraldine base subjected to different chemical treatments and aging procedures. Thermogravimetric measurement have shown that water content in polymeric matrices may amount up to 20-25 wt.% with two distinguished reversible absorbance states of water molecules. Weakly bond water (3-5 kcal/mol) is incorporated into PANI from ambient atmosphere and could be eliminated by drying at room temperature in vacuu…

Micellar liquid chromatography for prediction of drug transport.

2000

Abstract The vast majority of well absorbed drugs are transported passively across the cell membranes. Physicochemical descriptors of drug molecules that are believed to influence transcellular transport are routinely used to predict drug absorption by means of complex mathematical models. In this paper, a new in vitro method, based on the retention data in micellar liquid chromatography (MLC), is validated for the prediction of passive drug absorption. The retention of a heterogeneous drugs set in MLC using Brij 35 as surfactant in the mobile phase is compared with the retention data reported in literature obtained in red cell membrane lipid liposomes, human red cell membranes vesicles (ve…