Search results for "Semi"

Il lavoro e l'arte della ricerca: Antonino Buttitta

2018

Si tratta della ricostruzione del profilo intellettuale e scientifico di Antonino Buttitta, tra i capiscuola delle discipline demoetnoantropologiche in Italia, al quale si deve una originale declinazione dell'approccio strutturalista nell'analisi dei fatti culturali nell'ambito della semiotica della cultura.

"Il viaggio" di Tomasi di Lampedusa. Uno sguardo antropologico sullo spazio dell'attraversamento

2011

Dzimtes lomas luterāņu draudzē – „dabiskais” un „tradicionālais”

2015

Bakalaura darbs “Dzimtes lomas luterāņu draudzē – “dabiskais” un “tradicionālais”” ir pētījums par to, kā dzimtes lomas tiek definētas un argumentētas kādā Rīgas luterāņu draudzē organizētā pirmslaulību seminārā, vēršot uzmanību uz to, kā veidojas priekšstati un kā dzimtes lomas tiek pamatotas Baznīcā, draudzē, seminārā un semināra apmeklētāju ģimenēs. Caur dzimtes lomām ir iespējams veidot un pamatot noteiktu kārtību sabiedrībā. Pētījumā iepazīstot trīs savstarpēji saistītus dzimtes lomu argumentācijas līmeņus – Baznīcas, draudzes un individuālo, bija iespējams paraudzīties uz to, kā mūsdienās dzimtes lomu argumentācijā reliģiskā kontekstā patriarhālās ģimenes struktūras aizstāvēšana pastā…

Regurgitant flow in apparently normal valve prostheses: improved detection and semiquantitative analysis by transesophageal two-dimensional color-cod…

1990

In 128 patients with apparently normally functioning prosthetic valves ( n = 136) in the aortic position ( n = 79) and the mitral position ( n = 57), the prevalence of transprosthetic regurgitant flow was studied by use of transthoracic and transesophageal two-dimensional color-coded Doppler echocardiography. With the transthoracic approach, regurgitant flow was detected in early systole or diastole for 28% of the mitral prostheses and for 29% of the aortic prostheses. With transesophageal color-coded Doppler echocardiography, regurgitant jets were visualized for 95% of the mitral prostheses and for 44% of the aortic prostheses. In 40% of the Bjork-Shiley prostheses and 88% of the St. Jude …

Revisiting the thiosemicarbazonecopper(II) reaction with glutathione. Activity against colorectal carcinoma cell lines.

2018

Thiosemicarbazones (TSCs), and their copper derivatives, have been extensively studied mainly due to the potential applications as antitumor compounds. A part of the biological activity of the TSC-CuII complexes rests on their reactivity against cell reductants, as glutathione (GSH). The present paper describes the structure of the [Cu(PTSC)(ONO2)]n compound (1) (HPTSC =pyridine-2-carbaldehyde thiosemicarbazone) and its spectroscopic and magnetic properties. ESI studies performed on the reaction of GSH with 1 and the analogous [{Cu (PTSC*)(ONO2)}2] derivative (2, HPTSC* =pyridine-2-carbaldehyde 4N-methylthiosemicarbazone) show the absence of peaks related with TSC-Cu-GSH species. However GS…

The factorization method for real elliptic problems

2006

The Factorization Method localizes inclusions inside a body from mea- surements on its surface. Without a priori knowing the physical parameters inside the inclusions, the points belonging to them can be characterized using the range of an auxiliary operator. The method relies on a range characterization that relates the range of the auxiliary operator to the measurements and is only known for very particular applications. In this work we develop a general framework for the method by considering sym- metric and coercive operators between abstract Hilbert spaces. We show that the important range characterization holds if the difference between the inclusions and the background medium satisfi…

Trajetória docente na transição e na apropriação de tecnologias digitais em práticas de ensino

2018

This study focused on the appropriation of digital technologies by two teachers as an instrument of teaching and instruction in secondary school. We are interested in the teaching trajectory in the transition from traditional practices to hybrid learning contexts. We use mixed methods based on the Grounded Theory and contribution of Theory of Activity and dialogic approach. We chose qualitative research with audio-recorded interview, documental source and field observations of interactions between students in a hybrid context of learning. The main results indicated that the teacher trajectory passes through technological appropriation in: a) conventionalization of a symbolic and semiotic fi…

Desulfurization processes of thiosemicarbazonecopper(ii) derivatives in acidic and basic aqueous media

2013

This work provides structural evidence for different desulfurization processes in aqueous solutions of [CuL]+ derivatives (HL = pyridine-2-carbaldehyde thiosemicarbazone). Structural resolution has been achieved for the [{CuL(SH)}2] (1), [CuLCl]2[Cu(pic)2] (pic− = picolinato, pyridine-2-carboxilato) (2) and [Cu(HL)(NCS)](NO3) (4) compounds, together with a derivative of 4 with formula [Cu(HL)(NCS)][Cu(HL)(NCS)0.72(NO3)0.28](NO3)2 (5), whose HS−, pic− and NCS− ligands come from thiosemicarbazone breakage. The behaviour of the [CuL]+ species in basic aqueous solutions or water under reflux has been compared with that exhibited by iron(III), cobalt(III), zinc(II) and lead(II) derivatives of th…

Membranes Directly Prepared from Solutions of Unsubstituted Cellulose

2005

Summary: Starting from 5 wt.-% solutions of a prehydrolysis kraft pulp ( = 135 kg · mol−1) in the mixed solvent (dimethylacetamide + 7 wt.-% LiCl) we have prepared cellulose membranes on different supports according to the phase inversion process using above all acetone (AC) and 2-propanol as precipitants. In this context we have studied the phase behavior of the quasiternary system (DMAc+LiCl)/AC/cellulose. The obtained membranes are mechanically stable and in their mechanical and separation properties on the whole comparable to membranes consisting of regenerated cellulose. With respect to gas separation the ideal selectivity of CO2 in combination with N2 and O2 turns out to be opposite f…

Some working principles of heterogeneous photocatalysis by semiconductors

1993

The present paper outlines some of the principles which are the working base for the photocatalytic processes: we refer to those photocatalytic processes performed using irradiated semiconductors. The steps related to the photoproduction of electron-hole pairs and their separation are discussed. It is also shown how the step of pair separation induces the formation of various chemical species, some of which are useful for the oxidation reactions. It is also shown that in order to reach a detailed description of photocatalytic processes it is necessary to have the knowledge of both the electronic and the physicochemical features of the semiconductors. The paper finally reports a case study r…