143 research outputs found
Rietveld refinement of the Tutton salt K-2[Fe(H2O)(6)](SO4)(2)
No full textDipotassium hexaaquairon(II) bis( sulfate), K-2[Fe(H2O)(6)]-( SO4)(2), is a member of the isotypic series of Tutton salts with general formula M-2(I)[M-II(H2O)(6)](XO4)(2), where X = S, Se or Cr. The structure contains centrosymmetric Fe(H2O)(6) octahedra, with an average Fe-O distance of 2.14 (4) angstrom. Each octahedron is surrounded by isolated SO4 tetrahedra [average S-O distance = 1.483 (15)angstrom] and distorted KO6(H2O)(2) polyhedra with an average K-O distance of 2.96 (15) angstrom. The polyhedra are linked via common O atoms and a system of medium-strength hydrogen bonds
Structuring and highlighting speech - Discursive functions of holding away gestures in Savosavo
No full textBressem J, Stein N, Wegener C. Structuring and highlighting speech - Discursive functions of holding away gestures in Savosavo. In: Ferré G, Tutton M, eds. Gesture and Speech in Interaction - 4th edition (GESPIN 4). 2015: 49-54
Vertebroplasty using transoral approach in painful malignant involvement of the second cervical vertebra (C2): a single-institution series of 25 patients
No full textVertebroplasty is a minimally invasive procedure demonstrated to be safe and effective in the treatment of painful osteoporotic and malignancy related fractures when performed in the thoracolumbar spine. Multiple randomized and nonrandomized reports have demonstrated its effectiveness. Conversely, transoral vertebroplasty (TOV) to treat the second cervical vertebra (C2) has been described in only a few case reports
Vertebroplasty using transoral approach in painful malignant involvement of the second cervical vertebra (C2): a single-institution series of 25 patients
No full textVertebroplasty is a minimally invasive procedure demonstrated to be safe and effective in the treatment of painful osteoporotic and malignancy related fractures when performed in the thoracolumbar spine. Multiple randomized and nonrandomized reports have demonstrated its effectiveness. Conversely, transoral vertebroplasty (TOV) to treat the second cervical vertebra (C2) has been described in only a few case reports
Temperature-Induced Phase Transformations in Tutton Salt K2Cu(SO4)2(H2O)6: Thermoanalytical Studies Combined with Powder X-Ray Diffraction
No full textTutton salts have received considerable attention due to their potential applications in thermochemical energy storage (TCHS) systems. This technology requires high-purity materials that exhibit reversible dehydration reactions, significant variations in dehydration enthalpy, and high-temperature melting points. In this study, K2Cu(SO4)2(H2O)6 Tutton salt in the form of single crystals was grown using the slow solvent evaporation method. Their structural, morphological, and thermal characteristics are presented and discussed, as well as temperature-induced phase transformations. At room temperature, the salt crystallizes in a monoclinic structure belonging to the P21/a space group, which is typical for Tutton salts. The lack of precise control over the solvent evaporation rate during crystal growth introduced structural disorder, resulting in defects on the crystal surface, including layer discontinuities, occlusions, and pores. Thermoanalytical analyses revealed two stages of mass loss, corresponding to the release of 4 + 2 coordinated H2O molecules—four weakly coordinated and two strongly coordinated to the copper. The estimated dehydration enthalpy was ≈ 80.8 kJ/mol per mole of H2O. Powder X-ray diffraction measurements as a function of temperature showed two phase transformations associated with the complete dehydration of the starting salt occurring between 28 and 160 °C, further corroborating the thermal results. The total dehydration up to ≈ 160 °C, high enthalpy associated with this process, and high melting point temperature make K2Cu(SO4)2(H2O)6 a promising candidate for TCHS applications
The repairs to the dome of the Chapel of St. Gennaro's Treasure: an Eighteenth-century dispute between F. Sanfelice and G. Lucchese
No full textIn 1708, Ferdinando Sanfelice published “The report on the repairs to the dome of St. Gennaro’s Treasure Chapel” entering the heated debate on the diagnosis of the cracks revealed in the above-mentioned dome. The scientific community split into two different currents of thought, whose main points are: 1) The former considered the dome seriously compromised; the cause of the damage was attributed to an insufficient thickness of the tambour and therefore it proposed to add a further iron bandaging, in addition to the three existing reinforcement rings. 2) The latter dissented and reputed that the fractures didn't endanger the stability of the structure. For the experts that supported this current of thought, the cause was to be attributed exclusively to the excessive weight of the small lantern and not " per difetto de’ muri di fabbrica " ( to the thickness of the main walls); and in fact, the first repair was the substitution of the stone lantern with an oaken one. In this context, we find Ferdinando Sanfelice engaged in a heated debate with all the advocates of the dome encirclement and particularly with Lucchese. The intention of this note is to interpret the Ferdinando Sanfelice and Giuseppe Lucchese statements in the light of the XVIII century static theories on the vaulted buildings. Particularly, the two reports will be reread through the treatises Statica degli Edifici and Voltimetria Retta by Vincenzo Lamberti, Neapolitan engineer of the XVIII century, with reference to other coeval handbooks. Subsequently, the validity of the statements will be tested with an appropriate numerical method, according to the contemporary techniques of modelling masonries
Exploring the Diversity and Dehydration Performance of New Mixed Tutton Salts (K2V1−xM’x(SO4)2(H2O)6, Where M’ = Co, Ni, Cu, and Zn) as Thermochemical Heat Storage Materials
No full textTutton salts form an isomorphic crystallographic family that has been intensively investigated in recent decades due to their attractive thermal and optical properties. In this work, we report four mixed Tutton crystals (obtained by the slow solvent evaporation method) with novel chemical compositions based on K2V1−xM’x(SO4)2(H2O)6, where M’ represents Co, Ni, Cu, and Zn, aiming at thermochemical energy storage applications. Their structural and thermal properties were correlated with theoretical studies. The crystal structures were solved by powder X-ray diffraction using the Rietveld method with similar compounds. All of the samples crystallized in monoclinic symmetry with the P21/a-space group. A detailed study of the intermolecular interactions based on Hirshfeld surfaces and 2D fingerprint mappings showed that the main interactions arise from hydrogen bonds (H∙∙∙O/O∙∙∙H) and dipole–ion (K∙∙∙O/O∙∙∙K). On the other hand, free space percentages in the unit cells determined by electron density isosurfaces presented low values ranging from 0.53 (V–Ni) to 0.81% (V–Cu). The thermochemical findings from thermogravimetry, a differential thermal analysis, and differential scanning calorimetry indicate that K2V0.47Ni0.53(SO4)2(H2O)6 salt is the most promising among mixed salts (K2V1−xM’x(SO4)2(H2O)6) for heat storage potential, achieving a low dehydration temperature (≈85 °C), high dehydration enthalpy (≈360 kJ/mol), and high energy storage density (≈1.84 GJ/m3)
Ostensive signals. Markers of communicative relevance of gesture during demonstration to adults and children
No full textContains fulltext :
151133.pdf (Publisher’s version ) (Open Access)The4th GESPIN - Gesture & Speech in Interaction Conference, 02 september 201
Age-related differences in multi-modal audience design: Young, but not old speakers, adapt speech and gestures to their addressee's knowledge
No full textContains fulltext :
151119.pdf (Publisher’s version ) (Open Access)The 4th GESPIN - Gesture & Speech in Interaction Conference, 02 september 201
Not so dependent after all: functional perception of speakers' gestures with and without speech
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