Search results for "Dono"
showing 10 items of 572 documents
Mutat terra vices. Identità, cambiamento e memoria culturale nell'ultimo Orazio
2010
Per molto tempo il quarto libro di odi di Orazio è rimasto ai margini degli studi sull’autore e sulla sua produzione, ora relegato nell’angolo della poesia antica meno interessante, perché esplicitamente frutto della commissione del potere, ora riletto come opera della quale è impossibile, e forse inutile, individuare la specificità. Questo volume prende le mosse proprio dal dato più problematico offerto dalla raccolta, ossia la dichiarata discontinuità rispetto ai primi tre libri lirici, e mette a fuoco la centralità, tematica e strutturale, che il cambiamento e i suoi effetti assumono nei quindici componimenti che la costituiscono. Viene delineata così una pista esegetica che interpreta i…
Libri e reciprocità. Aspetti simbolici della circolazione libraria tra Cicerone e Tacito
2015
In this ‘late age of printing’, while we still feel part of a book culture, other media have taken the place of books in important respects. The change has affected not only the objects used for writing or reading or communicating, but also the frames of meaning hitherto associated with these practices. This paper sets out to discuss some types of meaning attaching to books in Latin literature from Cicero to Tacitus. Reconstructing the cultural meanings of books in literary representations from the Latin world could prove helpful by raising questions about our ability to orient ourselves in the present period of change.
Chromogenic detection of nerve agent mimics
2008
The current rise in international concern over criminal terrorist attacks via chemical warfare (CW) agents has resulted in an increasing interest in the detection of these lethal chemicals. Among CW species, nerve agents are extremely dangerous and their high toxicity and ease of production underscore the need to detect these deadly chemicals via quick and reliable procedures. A number of detection systems have been developed, most of them based on enzymatic and physical methodologies. However, these usually show limitations such as low selectivity, lack of portability and a certain complexity in their use. An alternative to these classical methods that has been gaining interest in recent y…
Solvatochromic behaviour of new donor–acceptor oligothiophenes
2021
Oligothiophene derivatives play a central role in the formulation of materials used in devices in the field of organic electronics. In this work, we report the results of the study of UV-vis absorption and fluorescence spectra, in several solvents, of a series of oligothiophenes recently synthesized in our laboratory. The studied oligothiophenes present different structures due to several factors: the donor– acceptor (D–A) or acceptor–donor–acceptor (A–D–A) architecture, the number of thiophene rings in the backbone (ranging from three to eight), the number and position of solubilizing octyl chains in the backbone, and the type of acceptor moieties (from Knoevenagel condensation either with…
Fabrication and characterization of Donor/Acceptor heterojunction organic solar cells
2018
Results of initial development of organic solar cells having the Donor/Acceptor heterojunction structure with and without an exciton blocking layer are reported. Characterization is carried out in AM1.0 condition with 100 mW/cm2 incident optical power density. The best device has the exciton blocking layer and exhibits an open circuit voltage VOC = 0.43 V, a short circuit current density JSC = 2.35 mA/cm2 with a fill factor FF ≈ 50%, an external quantum efficiency (electrons/s over incident photons/s) EQE ≈ 5% and a power conversion efficiency of about 0.5%.
A retrospective transversal study of enlargement and college dropout
2006
At present leaving and prolonging studies constitutes a serious problem at the university level. This report pre-sents the results of a retrospective transversal study which purpose was to identify risk factors related with dropout. The methodology design used can be for help
Gli oracoli di distruzione contro l’Egitto Ez 29–32 alla luce della retorica ebraica
2021
Commentators of the Book of Ezekiel achieved different results when it comes to the structures of the oracle. This was the context of the research undertaken. The aim was to develop the structures of the oracle according to the scientific method by Roland Meynet. The research was based on «analysis of the biblical text by the method of Hebrew rhetoric». As a result of the research, it was discovered that there are six (rather than seven) oracles. The first three oracles have parallel structures, the next three have parallel-concentric structures. It was also possible to discover numerical systems that either confirm the content of the text or introduce new information that is not written in…
Compromiso Estudiantil en el Contexto Universitario Colombiano y Desempeño Académico
2014
20 páginas A pesar de la ampliación de la cobertura en la educación superior latinoamericana, persisten graves problemas de deserción que llevan a cuestionar el papel de las experiencias educativas en el fomento del compromiso académico de los estudiantes. Esta investigación se realizó en Colombia y buscó determinar la relación que existe entre el compromiso estudiantil y el desempeño académico de un grupo de universitarios colombianos. El estudio transversal y correlacional empleó la versión en español de la encuesta National Survey of Student Engagement (NSSE) que mide el nivel de participación de los estudiantes en cinco dimensiones: reto académico, aprendizaje activo y colaborativo, int…
La ciencia ficción y la enseñanza de las ciencias
2012
Este trabajo constituye una primera aproximación a la ciencia en la ciencia ficción desde el punto de vista del alumnado y qué posibilidades ofrece como recurso didáctico. Sondeamos, por tanto, si los alumnos conocen y han visto cine de ciencia ficción, así como si este factor influye en sus actitudes hacia la ciencia y los científicos y su opinión sobre las consecuencias de los avances científicos en el futuro. Asimismo, nos planteamos si los estudiantes perciben las visiones deformadas de la ciencia y los científicos que transmite el cine de ciencia ficción. Pretendemos, asimismo, estudiar si se utiliza la ciencia ficción como recurso didáctico.
Repeated kidney re-transplantation—the Eurotransplant experience: a retrospective multicenter outcome analysis
2020
Transplant international (2020). doi:10.1111/tri.13569