Iskanje po repozitoriju

A+ | A- | | SLO | ENG

Opis: Iron-phthalocyanine molecules deposited on the Au(110) reconstructed channels assemble into one-dimensional molecular chains, whose spatial distribution evolves into different structural phases at increasing molecular density. The plasticity of the Au channels first induces an ordered phase with a 5×5 symmetry, followed by a second long-range ordered structure composed by denser chains with a 5×7 periodicity with respect to the bare Au surface, as observed in the low-energy electron-diffraction (LEED) and grazing incidence X-ray diffraction (GIXRD) patterns. The geometry of the FePc molecular assemblies in the Au nanorails is determined by scanning tunneling microscopy (STM). For the 5×7 phases, the GIXRD analysis identifies a “4-3” rows profile along the [001] direction in the Au surface and an on-top FePc adsorption site, further confirmed by density functional theory (DFT) calculations. The latter also reveals the electronic mixing of the interface states. The chain assembly is driven by the molecule–molecule interaction and the chains interact with the Au nanorails via the central metal atom, while the chain–chain distance in the different structural phases is primarily driven by the plasticity of the Au surface.
Ključne besede: STM, LEED, DFT, density functional theory, phthalocyanine, Au(110), gold, surface
Objavljeno v RUNG: 13.10.2016; Ogledov: 4808; Prenosov: 0
Gradivo ima več datotek! Več...

Ključne besede: grafen, transportne lastnosti, organski tankoslojni tranzistorji, tok fotovzbujenih nosilcev naboja
Objavljeno v RUNG: 16.06.2016; Ogledov: 4904; Prenosov: 134
Povezava na celotno besedilo

Ključne besede: pain, sensory neurons, natriuretic peptide, signaling
Objavljeno v RUNG: 17.05.2016; Ogledov: 4681; Prenosov: 132
Povezava na celotno besedilo

Opis: Several studies have shown that traditional standardised aphasia tests may not be sensitive enough to adequately assess linguistic deficits and recovery patterns in persons with aphasia. As a result, both functional and structural methods for the ana- lysis of connected language samples from people with aphasia have been devised (see Armstrong, 2000; Prins & Bastiaanse, 2004). The present article focuses on our attempt to provide a comprehensive, multi-level procedure for both structural and functional analysis of narrative discourse produced by speakers with brain damage. Accordingly, we will describe a method for analysis of connected language samples elicited on single picture and cartoon story description tasks. This method has proven sensitive in the assessment of language deficits in many neurogenic populations. A comprehensive description of the language production sys- tem, a thorough discussion of the different approaches to discourse analysis in persons with aphasia, and the procedure for the analysis of narrative discourse are detailed. The characteristics of the eliciting stimuli, the procedures for their administration and the transcription of the language samples are carefully explained. The analysis focuses on four main aspects of linguistic processing: productivity, lexical and grammatical pro- cessing, narrative organisation, and informativeness. To further illustrate the analytic procedure, two case reports and an appendix with the analysis of a narrative sample are provided. We will provide direct evidence of the usefulness of the multi-level procedure for discourse analysis for assessing changes in discourse performance of two persons with fluent aphasia, with different aetiologies, that were not captured by tradi- tional standardised aphasia tests. The method of analysis presented in this paper has strong grounds in linguistic and psychological theories of linguistic structure and functioning. It also has the advantage of being both quantitative and functional as it captures selective aspects of linguistic processing, and can provide relevant information about the person's communicative and informative skills.
Ključne besede: aphasia, language, narrative analysis
Objavljeno v RUNG: 07.03.2016; Ogledov: 4434; Prenosov: 1
Gradivo ima več datotek! Več...

Opis: Mild traumatic brain injury (mTBI) represents a condition whose cognitive and behavioral sequelae are often underestimated, even when it exerts a profound impact on the patients’ every-day life. The present study aimed to analyze the features of narrative discourse impairment in a group of adults with mTBI. 10 mTBI non-aphasic speakers (GCS > 13) and 13 neurologically intact participants were recruited for the experiment. Their cognitive, linguistic and narrative skills were thoroughly assessed. The group of mTBIs exhibited normal phonological, lexical and grammatical skills. However, their narratives were characterized by the pres- ence of frequent interruptions of ongoing utterances, derailments and extraneous utterances that at times made their discourse vague and ambiguous. They produced more errors of global coherence [F (1; 21)1⁄424.242; p1⁄4.000; h2p1⁄40. 536] and fewer Lexical Information Units [F (1; 21) 1⁄4 7.068; p 1⁄4 .015; h2p 1⁄4 .252]. The errors of global coherence correlated negatively with non- perseverative errors on the WCST (r 1⁄4 1⁄4.755; p < .012). The mac- rolinguistic problems made their narrative samples less informa- tive than those produced by the group of control participants. These disturbances may reflect a deficit at the interface between cognitive and linguistic processing rather than a specific linguistic disturbance. These findings suggest that also persons with mild forms of TBI may experience linguistic disturbances that may hamper the quality of their every-day life.
Ključne besede: mild traumatic brain injury, narrative analysis, neurolinguistics, neuropsychology
Objavljeno v RUNG: 07.03.2016; Ogledov: 4816; Prenosov: 1
Gradivo ima več datotek! Več...