281 research outputs found
La poesía d'Hèctor B. Moret
No full textS'estudien cronológicament els sis poemaris de qué consta Fobra lírica d'Héctor B. Moret i se n'indiquen les possibles influéncies. N'és caracteristic el to meditatiu i desolat dels primers i darrers poemaris en versos lliures, tren-cat per un període intermedi amb versos de to enjogassat i festiu i rigorisme me-tric. Se'n destaquen temes i motius com el mite espriuá del nord-enllá, la metá-fora del joc i Ferotisme, el collage poétic, el tema morisc i la reflexió sobre el propi text. En la llengua el poeta fa servir en perfecta simbiosi cultismes, localismes, colloquialismes i llenguatge de joves, i mostra una clara prefer~ncia per formes nordoccidentals, sense per aixÓ defugir les dels altres territoris de la llen-gua. Finalment s'ofereix la bibliografia de la producció poética d'Héctor B. Mo-ret i dels estudis que se n'han fet = The six books of verse which constitute the poetry of Héctor B. Moret are studied chronologically. Possible influences on these works are also consi-dered. A meditative and desolate tone characterizes the first and last books in free vers, broken by an intermediate period with playful and gay vers in strict metre. Many themes and motifs are treated: the Espriuan northwards-myth, the metaphor of game and eroticism, the poetic collage, the morisque theme and the poet's reflection on his own text. The author uses a range of registers in a per-fect symbiosis: learned forms, localisms, colloquialisms and the language of adolescence. Moret shows a clear preference for northwestern forms, whilst not rejecting forms from all the other areas. Finally a bibliography of the poetical corpus of Héctor B. Moret and related studies is given
La poesía d'Hèctor B. Moret
No full textS'estudien cronológicament els sis poemaris de qué consta Fobra lírica d'Héctor B. Moret i se n'indiquen les possibles influéncies. N'és caracteristic el to meditatiu i desolat dels primers i darrers poemaris en versos lliures, tren-cat per un període intermedi amb versos de to enjogassat i festiu i rigorisme me-tric. Se'n destaquen temes i motius com el mite espriuá del nord-enllá, la metá-fora del joc i Ferotisme, el collage poétic, el tema morisc i la reflexió sobre el propi text. En la llengua el poeta fa servir en perfecta simbiosi cultismes, localismes, colloquialismes i llenguatge de joves, i mostra una clara prefer~ncia per formes nordoccidentals, sense per aixÓ defugir les dels altres territoris de la llen-gua. Finalment s'ofereix la bibliografia de la producció poética d'Héctor B. Mo-ret i dels estudis que se n'han fet = The six books of verse which constitute the poetry of Héctor B. Moret are studied chronologically. Possible influences on these works are also consi-dered. A meditative and desolate tone characterizes the first and last books in free vers, broken by an intermediate period with playful and gay vers in strict metre. Many themes and motifs are treated: the Espriuan northwards-myth, the metaphor of game and eroticism, the poetic collage, the morisque theme and the poet's reflection on his own text. The author uses a range of registers in a per-fect symbiosis: learned forms, localisms, colloquialisms and the language of adolescence. Moret shows a clear preference for northwestern forms, whilst not rejecting forms from all the other areas. Finally a bibliography of the poetical corpus of Héctor B. Moret and related studies is given
Surface Reconstructions in Organic Crystals: Simulations of the Effect of Temperature and Defectivity on Bulk and (001) Surfaces of 2,2′:6′,2′′-Ternaphthalene
No full text2,2′:6′,2′′-Ternaphthalene (NNN) is a novel, blue-emitting material, suitable for preparation of organic light-emitting diodes. Its crystal structure has been solved recently, but its thermal behavior and surface properties have not yet been explored, partly due to the difficulty in obtaining high quality crystals. In the present study we use classical molecular dynamics to investigate the thermal behavior of bulk and (001) surfaces of NNN. Our bulk simulations indicate the occurrence of a phase transition at about 600 K. The transition is facilitated by the presence of a free (001) surface, since a reconstruction leading to a very similar structure occurs around 550 K in our
surface models. This holds for both ideal and defective surface models, containing a small number of vacancies (one or two missing molecules in the outermost layer). In all cases, the process is triggered by thermal motion and involves the reorientation of the molecules with respect to the (001) plane. Both the bulk and surface phases share the monoclinic space group P21/a with a herringbone disposition of molecules. These findings and their implications for the use of NNN in organic electronics are discussed
Cognitive exergame training and transcranial random noise stimulation effects on executive control in healthy young adults
No full textObjective: In the present study, we investigated the efficacy of transcranial random noise stimulation (tRNS) combined with an exergame training (physical exercise combined with a videogame) chosen as potential techniques to boost brain functioning and to promote plastic effects in healthy young adults. The aim was to improve the motor response speed and the response time when inhibition was required. Method: Forty-nine participants were randomly assigned to four conditions. The protocol consisted of eight sessions of exergame cognitive training (or no training) associated with the active or sham stimulation of the left dorsolateral prefrontal cortex (left-DLPFC). Results: The results indicated faster simple reaction times following the exergame training, and faster reaction times in Go trials (while the ratio of NoGo trials remained unaltered) following tRNS. No interactions were present between the two procedures. Conclusions: These findings reveal better performance in both tasks with independent effects of the two techniques. Using noninvasive brain stimulation and exergame training may be a viable strategy to increase motor response speed and improve executive control. (PsycInfo Database Record (c) 2021 APA, all rights reserved)
Exploring the phase behavior of C8-BTBT-C8 at ambient and high temperatures: insights and challenges from molecular dynamics simulations
No full textC8-BTBT-C8 is one promising candidate for the development of high-performance electronic devices based on thin-film technologies. Its monoclinic polymorph has a well-established role in thin-film growth. Yet, quite little information is available about its dynamics on the molecular scale, and the structures of the mesophases which form at high temperature (about 100 K above ambient temperature). The present study is devoted to the analysis of such phases, with the ultimate goal of developing molecular models. Already at ambient temperature, our molecular dynamics simulations reveal a rich conformational behavior of the alkyl side chains, with gauche conformations as leading structural defects. Heating promotes the formation of a stacking faulted mesophase (380 K), and a smectic phase, at 385 K, upon side chain melting. Although more disordered, this phase bears several analogies with the smectic A phase, experimentally observed at 382.5 K. At higher temperatures, the increase in configurational disorder is brought by molecular diffusion and other phenomena, finally leading to an isotropic molten phase. Our in-depth analysis, complemented by hot-stage polarizing microscopy data, provides interesting insights into this material, highlighting the challenges associated with the modeling of soft semiconducting systems
El padre Moret confesor en vascuence
No full textIn 1645 the post of vicar of San Cernin's Church in Pamplona was filled with a priest who did not speak the Basque language. In view of the newness, the Basque parishioners brought an action requesting for a priest knowledgeable about their language, with whom they could confess. Father José Moret, S. (1615-1687), borne in that Church, and future author of the "Annals of the Kingdom of Navarra" and other historical works, took part as a witness and testified that only one of every fifteen people he confessed did it in Basque language. That revealed that he spoke that language, such as many other priests and people from Pamplona at that time.Vacante el cargo de vicario de la iglesia de San Cernin en Pamplona (1645), fue nombrado para él un sacerdote desconocedor de la lengua vasca. Ante la novedad, los feligreses vascongados entablaron pleito, pidiendo cura conocedor de su lengua, con quien poder confesarse. Intervino como testigo el Padre José Moret, S.J. (1615-1687), nacido en esa parroquia, futuro autor de los "Anales del Reyno de Navarra" y de otras obras históricas; declaró que solamente una de cada quince personas que él confesaba lo hacía en vascuence. Ello revela que hablaba esta lengua, como tantos clérigos y pamploneses contemporáneos.Iruñeko San Cernin elizako bikario kargua hutsik egonez (1645ean), euskaraz ez zekien apeiza bat izendatu zuten bikario. Berri hau zela eta, euskal eliztarrek pleito jarri zuten euskaldun apeiza eskatuz, aitortzerakoan beraien hizkuntza erabili ahal izateko.
Parrokia honetan jaiotako Jose Moret Aita, S.J. (1615-1687), geroago "Anales del Reyno de Navarra" delakoa eta beste idazlan historiko batzuen idazlea izango zena, lekuko izan zen; berak aitortutako hamabost pertsona bakoitzeko bat bakarrik euskalduna zela deklaratu zuen.
Garaiko elizgizon eta iruñatar askok bezala euskaraz egiten zuela adierazten du honek
Migration of selected hydrocarbon contaminants into dry pasta packaged in direct contact with different materials
No full textL’articolo descrive uno studio di migrazione di contaminanti idrocarburici (idrocarburi di origine minerale, diisopropil naftalene, polialfaolefine)
a differenti materiali di imballaggi in pasta secca di semola e all’uovo. La migrazione è stata monitorata durante la shelf-life della pasta
(fino a un massimo di due anni) simulando lo stoccaggio in supermarket (pacchi in scaffale), in condizioni che prevengono scambi con
l’esterno (pacchi avvolti in foglio di alluminio) e in imballaggio secondario (scatola di cartone riciclato corrugato)
Phase Stability and Morphology of Gel Grown Crystals: The Case of CdCl2-bpp Polymeric System
No full textA phenomenological study is carried out on a complex two-component di ff usion-reacting system in gel, that is, the Cd-1,3-bis(4-pyridyl) propane (Cd-bpp) coordination polymer. The latter can exist in three solid forms, which exploit a 1: 1 correspondence among the Cd /bpp ratio, the crystal structure and the crystal morphology (1 /2: bipyramids; 2 /3: needles; 1 /3: plates). The aim was to clarify the role of key physicochemical variables (reactant concentrations, composition of the solvent and density of the transport medium) in determining the chemical nature and the morphology of the final crystallization products. The gel method was tested in a variety of di ff erent crystallization configurations, including single and double di ff usion techniques. The density of the gel primarily a ff ects the morphology of the synthesized crystals, with denser media favouring the needle-like 2 /3 Cd-bpp species and diluted ones the 1 /2 Cd-bpp bipyramidal one. However, higher densities of the gel are generally associated to strained crystals. The solvent composition is also important, as for example the 1 /2 Cd-bpp bipyramids require at least a minimum amount of ethanol to appear. We demonstrated that in gel the strict " equality" stoichiometric criteria for metal-to-ligand ratios can be sometimes eluded, as non-equilibrium concentrations can be locally attained. In this respect, the crystallization geometry was proven to act as a key tool to influence the crystallization output, as it determines the direction and magnitude of the concentration gradients. Finally, the use of U tubes to perform one-pot screenings of a large part of the crystallization space is discussed
Microscopic surface processes observed during the oxidative dissolution of sphalerite
No full textSphalerite cleavage surface dissolution in acidic (HCl) and oxygen-saturated solutions was investigated by liquid-cell Atomic Force Microscopy (AFM). The sphalerite surface was cleaved in the laboratory and then mounted in the liquid cell at 298 K with a fast continuous renewal of the interacting solution. AFM data indicate that unreacted (110) surfaces are characterised by flat surface terraces delimited by step edges aligned along [110] crystallographic directions. AFM imaging allowed us to investigate removal of matter only at pH = 0 (HCl). Under these conditions, etch pits develop that are delimited by 1-3-nm-high step edges. However, surface terraces are covered by nanometric protrusions, while the step edges are microrough. Ex-situ solution chemistry measurements performed in flow-through-reactor indicates strong undersaturation with respect to both zinc sulphide and zinc sulphate. The reactivity of the dissolving (110) surface decreases significantly during the 24 hours of run time. Such a decrease suggests a change in the mechanism governing the overall dissolution process. We interpret nanometric protrusions as due to oxidative reactions at the interface that result in a reorganisation of the surface at the nanometric scale. The mechanism limiting the rate of sphalerite dissolution would be the process of protrusion formation and dissolution. A similar phenomenon was observed in an AFM study of the galena surface. Finally, we propose that the process of protrusion formation could be general in the oxidative dissolution of metal sulphides
Oxidation of Crystalline Rubrene Films: Evidence of an Epitaxial Native Oxide Layer
No full textRubrene (RUB) is a benchmark organic semiconductor since the record exciton diffusion length and high charge carrier mobility are demonstrated in its orthorhombic single-crystal phase. In this respect, great research efforts on the growth and study of crystalline RUB thin films, the most suitable choice for device applications, are made, even though its oxidation remains a still open problem. Here, the oxidation of crystalline RUB thin films is focused, by studying and modeling the so-formed interface between RUB and its oxide. Optical spectroscopy carried out on freshly grown and aged crystalline RUB films gives evidence that oxidation occurs without altering the original crystal structure of the RUB films. To deeply analyze the process, a direct characterization of rubrene endoperoxide (RUBox) is proposed: after synthesizing a microcrystalline powder, its crystal structure and Raman response are determined. The joint results achieved on the RUBox powder and on aged RUB films demonstrate that RUBox forms as a crystalline native oxide layer with a well-defined epitaxial interface with the underlying RUB. Finally, structural constraints at the RUBox/RUB interface are shown to limit surface oxidation, with the oxide acting as a passivation layer against further oxidation
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