247 research outputs found
Dati sulla biologia di due specie di formiche mietitrici (Messor wasmanni e M.minor) nella Tenuta presidenziale di Castelporziano
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Preliminary studies of Formica pratensis Retz. at Collelungo (Rieti) (Hymenoptera Formicidae).
No full textLaboratory study of the orientation mechanisms of f. pratensis retz. (hymenoptera, formicidae).
No full textAnts are able to repeatedly reach a fixed point in the environment by means of external and/or internal orientation references.
The orientation mechanisms of workers of F. pratensis was studied in laboratory controlled conditions.
The video-recorded experiment involved a base configuration in which the workers associated the position of the food source with that of a visual signal. The experimental sessions involved a change of some variables (food source, visual and chemical signals) and measurement of the number of ants arriving at two platforms associated with the visual signals. The data were analysed by the χ2-test.
Our study shows that chemical signal is an information able to change the behaviour of F. pratensis workers. To better understand the importance of visual and idiothetic information instead, further investigation will be necessary
Laboratory study on the orientation mechanisms of Formica pratensis Retz. (Hymenoptera, Formicidae).
No full textEcological coexistence of low-density populations of Apodemus sylvaticus and A. flavicollis (Mammalia: Rodentia)
No full textThe population size (estimated by POPAN method) and potential interspecific competition and spatial distribution in relation to vegetation features were studied in two sympatric and syntopic rodent species, Apodemus sylvaticus and Apodemus flavicollis. The study was performed by capture-mark-recapture study within a trap grid, at two adjacent forest sites in Mediterranean central Italy. We found that the population sizes of the two rodent species were comparatively lower than those recorded in conspecifics from other central Italian areas, and that the potential for interspecific competition was low at both sites, as revealed by the lack of negative correlations between the relative abundances of the two species after Monte Carlo analyses. The number of captures of both rodent species was not correlated to either the number of trees in each grid cell or the sum of tree diameters. The general implications of the obtained results are discussed
Chemical soil properties of the nesting sites of two syntopic harvester ants: Messor wasmanni,M.minor.
No full textCompetition for foraging resources and coexistence of two syntopic species of Messor harvester ants in Mediterranean grassland
No full text1. Diet composition of two syntopic species of Messor seed-harvester ants (M. wasmanni Krausse and M. minor Andre) was evaluated during different periods over the year (May, July, October), by analysing food type (plant parts and species) and food size (weight, length, width). Morphological traits of foragers (head width and femur length) considered important features promoting diet partitioning were measured. 2. We used two robust randomisation algorithms (RA2 and RA3), adopted in niche overlap studies, to check for random vs non random utilisation of resources at intra- and interspecific level for the different periods. 3. Analyses showed high levels of overlap in the diet of the two species and no evidence of interspecific competition during most of the activity season. In particular, there was an aggregated use of resources in summer, whilst niche partitioning and evidence of competition when resources decreased in autumn. Intraspecifically, no evidence of competition was found. 4. Results suggest two different mechanisms for minimising competition: when food resources are abundant (summer), ants collected the same plant species but selected different sizes; when food resource is scarce (autumn), ants foraged on different plants. 5. The importance of different factors (morphological, behavioural, ecological) possibly affecting competition and coexistence are discussed
Il progetto dell’abitazione
No full textIl saggio sviluppa una lettura critica in parallelo dei progetti di abitazioni di Luigi Cosenza – case unifamiliari, collettive, popolari – e della Storia dell’Abitazione, denso e corposo volume, e tuttavia poco noto, frutto di una lunghissima ricerca dell’ingegnere-architetto napoletano.
Riallineate lungo un itinerario temporale, le case di Luigi Cosenza assumono un senso unitario che, riassorbendo contraddizioni, ritardi, ripensamenti, tende a restituire un complessivo progetto dell’abitazione cui farà eco nel 1974 la pubblicazione della Storia dell’Abitazione. Il ‘progetto’ e la ‘storia’ dell’abitazione si rivelano essere due facce, complementari, della stessa opera di teorico dell’architettura e di progettista, di raffinato intellettuale e di architetto militante, e finiscono per spiegarsi a vicenda, ciascuno è la chiave per comprendere l’altro. La ‘storia’ sembra ereditare solida sistematicità ed estensione dal metodo storico comparativo ottocentesco e tuttavia aderisce programmaticamente alla logica di uno studio di storia materiale fondato sull’analisi dei rapporti di produzione. La casa è progettata per la felicità dell’uomo, per la sua libertà, per la dignità, per la giustizia sociale; la forma architettonica della casa è “gioiosa impronta della creazione umana sulla natura dominata e trasformata secondo le aspirazioni dell’uomo”. Nel saggio, le case di Cosenza vengono studiate alla luce delle osservazioni dell’autore, se ne rintracciano così le matrici e le intenzioni formali, ma anche i fondamenti nella storia passata e contemporanea e le aspirazioni sociali e politiche, allo stesso tempo utopistiche e tuttavia estremamente concrete
A Survey on the combined use of IoT and Edge AI to improve Driver Monitoring systems
No full textAs revealed by different reports, one of the most dangerous daily activities is driving. In fact, a driver must be totally focused on the road, and avoid all possible distractions that may cause disasters or tragedies. This danger is especially felt by professional drivers, like taxi or truck drivers, that drive every day for long distances. Although different initiatives have already led to the introduction of specific legislative rules to prevent accidents (e.g., speed limits, maximum driving hours, obligatory wearing of seat belts, etc.), unfortunately various car accidents are still registered daily on almost every road in the world. The Internet of Things is one of the paradigms that have been preventing the occurrence of these dangerous scenarios by introducing new sensors and devices that enable more accurate control over both road and drivers. Nonetheless, in recent years, the IoT domain itself is dealing with a new revolution fostered by the introduction of Artificial Intelligence and Edge Computing concepts. The present paper aims to identify, through a state-of-the-art review, the most interesting works that exploit the combination of Artificial Intelligence, Edge Computing and IoT techniques to improve the safety in the driving sector. After presenting the results of the analysis that confirm the interest of researchers in such a direction, the paper describes a first version of a prototype developed to demonstrate the benefits that the combination of AI and IoT can bring to society and propose some interesting future scenarios
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