86,666 research outputs found
Factors affecting motorcyclists’ behavior in car-following condition
No full textCar-following (CF) maneuver plays an important role in both traffic flow analysis and road safety assessment. However, many studies on this issue have focused on the drivers’ behaviour, neglecting the different driving behaviour of the motorcycle riders and the vulnerability of this type of user. The aim of the present paper is to analyse the factors affecting the riders’ behaviour in CF condition, by using two surrogate safety indicators, Time Headway (TH) and Time To Collision (TTC). A field experiment was conducted to collect data. Twenty young motorcyclists participated in the study driving their own motorcycles, which were instrumented with a camera and a global positioning system device (GPS). A digital image processing algorithm was used to obtain CF related indicators. The results of the study showed that Time Headway (TH) and Time To Collision (TTC) are independent of each other, extending the result obtained in the literature for the four wheeled vehicles to the motorcycles. TTC and TH were therefore analyzed separately. As for TTC, it was observed that only in few cases (0.8%) the riders were found in risky condition (TTC < 5 s), confirming the role of this parameter for the detection of an impending risk. On the other hand, TH gives information about a potentially risky situation, and 99% of the riders were found in such condition (TH < 2 s). Due to the few cases in TTC risky conditions, only TH was further modelled by using the hazard-based duration analysis. Accelerated Failure Time (AFT) model specification was used, and the Weibull distribution provided the best fit of the data. The model identified four covariates affecting TH and all of them had the effect of reducing TH, increasing the collision risk. The time spent on CF condition, the speed of the motorcycle, the willingness of overtaking and the engine size of the motorcycle were the factors that reduced TH. The findings of this study could be considered in the development of microsimulation models; the factors that were found affecting the motorcyclists’ behavior in car-following condition could be considered for a more realistic simulation of the riders’ choice of Time Headway
Empleo no registrado en Argentina y el impacto en el sistema previsional
No full textTrabajo final de posgrado (Especialización en Derecho del Trabajo y la Seguridad Social) -- Universidad Nacional de Córdoba. Facultad de Ciencias Económicas; Argentina, 2018.Fil: Gulisano, Natalia F. Universidad Nacional de Córdoba. Facultad de Ciencias Económicas; Argentina.El proceso de globalización deja como balance un mercado laboral informal extendido y en franco proceso de crecimiento.
El trabajo informal plantea un desvío en los registros, oculta el análisis de sus causas y genera una derivación de recursos para asignaciones no contributivas.
Si bien los sistemas de reparto asistidos cuentan además de los aportes de los trabajadores y contribuciones de los empleadores con aportes del tesoro que intentan resolver el déficit presupuestario del sistema, en tanto ese aporte es prácticamente paritario en los guarismos, se desnaturaliza la asistencia, formando parte sustancial en su sostenimiento.
Se plantea qué pueden hacer las instituciones de seguridad social para garantizar su viabilidad y la viabilidad de los modelos de seguridad social que las sustentan, en especial en términos del cumplimiento de su misión de brindar protección y a la vez contar con el suficiente apoyo de la población para desarrollarse en el tiempo.Fil: Gulisano, Natalia F. Universidad Nacional de Córdoba. Facultad de Ciencias Económicas; Argentina
Standard completeness for extensions of IMTL
No full textWe provide a standard completeness proof which uniformly applies to a large class of axiomatic extensions of Involutive Monoidal T-norm Logic (IMTL). In particular, we identify sufficient conditions on the proof calculi which ensure density elimination and then standard completeness. Our argument contrasts with all previous approaches for involutive logics which are logic-specific
Resolving conflicting obligations in Mimamsa: a sequent-based approach
No full textThe Philosophical School of Mimamsa provides a treasure trove of more than 2000 years worth of deontic investigations. In this paper we formalize the Mimamsa approach of resolving conflicting obligations by giving preference to the more specific ones. From a technical point of view we provide a method to close a set of prima-facie obligations under a restricted form of monotonicity, using specificity to avoid conflicting obligations in a dyadic non-normal deontic logic. A sequent-based decision procedure for the resulting logic is also provided
Genomic organization and chromosomal localization of the mouse Connexin36 (mCx36) gene
No full textConnexin36 (Cx36) is a new connexin that was recently cloned in mouse, rat and human. It is highly expressed in neurons of the CNS. To gain insight into the transcriptional regulation of this gene, we have cloned the genomic region containing the entire
mCx36 gene and sequenced about 7.6 kb around the coding region. The computer analysis of this sequence was helpful in defining putative regulative sequences. Using both 5'-RACE and RNAse protection assay, we have mapped the transcription starting site commonly used in both adult olfactory bulb and brain, in position −479 from the ATG. By 3'-RACE, we defined the polyadenylation site used that is located 1436 nt downstream the stop codon. The expected transcript is 2875 nt long and is consistent with the 2.9 kb transcript found in the same tissues by Northern blot. Finally, we have mapped mCx36 on chromosome
2 in the position F3 in a region that is synthenic to human chromosome 15q14, where the human Cx36 gene has been recently mapped
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Architettura e decorazione rococò in Sicilia occidentale: alcune considerazioni
No full textIn Sicilia occidentale il rococò perviene nel mondo dell’architettura e dell’arte decorativa intorno agli anni Quaranta del Settecento e perdura, come una delle correnti dominanti soprattutto nella decorazione degli interni e dei giardini, almeno sino ai tardi anni Settanta, quando l’affermarsi della cultura neoclassica, del neogreco e delle incisioni di Piranesi segna svolta che invece non ha paralleli in Val di Noto. Si tratta di un fenomeno diffuso, legittimato dalle incisioni e rintracciabile in molteplici fabbriche aristocratiche, che non è stato mai adeguatamente valutato. Non sono stati mai indagati i repertori delle incisioni esistenti nelle biblioteche o la circolazione e la diffusione di raccolte e stampe di ornato, queste ultime rappresentano il principale strumento di divulgazione del rococò. Sono in primo luogo i libri e i trattati di architettura francesi (D’Aviler, Blondel, Boffrand ecc.), che includono numerose incisioni decorative, a costituire un eccellente supporto divulgativo di forme e repertori ornamentali e a offrire modelli per le trasformazioni interne attuate nelle maggiori residenze aristocratiche in linea con i progetti più aggiornati degli hotels particuliers. Ma sono anche le raccolte miscellanee, le serie incise sia francesi che tedesche (Meissonier, Toro, Habermann ecc.) importanti mezzi di trasmissione. Gli esempi di decoro interno appaiono oggi numerosi, a Palermo uno dei casi più interessanti è il palazzo Valguarnera, il salone con la doppia volta traforata costituisce il punto più alto della cultura rococò palermitana assimilabile a esiti internazionali. Lo scalone di palazzo Bonagia e quello di palazzo Cutò sono invece sperimentazioni tridimensionali di eccezionale valore figurativo sempre legate al mondo della decorazione rococò. Un ulteriore aspetto è l’uso dei modelli rococò per gli esterni, in questo caso i modelli di porte e finestre appartengono all’orbita tedesca (Augsburg). Sempre nell’architettura civile il rococò influenza l’arredo e la decorazione di ville e giardini, un indirizzo che ha avuto un largo successo. Alcuni episodi significativi si registrano nei cantieri delle ville bagheresi
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