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FLUMO: FLexible Underwater MOdem

2019

The last years have seen a growing interest in underwater acoustic communications because of its applications in marine research, oceanography, marine commercial operations, the offshore oil industry and defense. High-speed communication in the underwater acoustic channel has been challenging because of limited bandwidth, extended multipath, refractive properties of the medium, severe fading, rapid time variation and large Doppler shifts. In this paper, we show an implementation of a flexible Software-Defined Acoustic (SDA) underwater modem, where modulation parameters are completely tunable to optimize performance. In particular, we develop the system architecture following two key ideas. …

Analisi dei Fabbisogni formativi nel turismo

2004

La ricerca si allinea a queste esigenze e procede alla rilevazione dei fabbisogni formativi, anzitutto con riferimento all’attuale situazione, in rapporto alla quale accerta se, ed in che misura, le attuali carenze di competenze e skill, qualora sussistano, riducono la capacità competitiva delle aziende determinando più alti costi di produzione o minore qualità degli output. Ed in secondo luogo, facendo esplicito riferimento ai progetti di crescita delle imprese e cercando di individuare se e per quali figure si prevedono fabbisogni formativi nuovi e l’importanza che viene attribuita al loro soddisfacimento. Dal punto di vista metodologico è abbastanza evidente che le informazioni che la ri…

Znaczenie rodziny w życiu skazanych poszkodowanych - opinie, oceny i potrzeby

2020

The questions addressed in the present paper concern the family relations of persons deprived of freedom who – remaining in the prison environment – have been degraded, that is convicts occupying the lowest rung in the informal penitentiary system, so-called victimized prisoners. They make a specific community, rejected and humiliated by other inmates. The necessity to ensure safety to them and help them protect their personal characteristics generates difficulties in activities of rehabilitative character. The aim of the research was to show the family relations of people degraded in the prison environment – a subject that has not been studied to date. The method of diagnostic survey was u…

Sur les traces du mouton en Gaule

2005

Concerning the evidence for sheep in Gaul.- In northern Gaul, bones of sheep and goat are found in most Iron Age sites, farms, villages, graves and shrines. It is difficult to establish a good distinction between the bones of these two species, but sheep are more numerous than goat. This short paper deals with the use of these animals in domestic and ritual practices over a long period, from the Late Bronze Age to the beginning of Roman period. The fact that these animals are represented by bones encourages the study of meat consumption. Mutton is consumed in domestic contexts, but it is also offered during banquets in shrines, public areas in villages or other places, and plays a role duri…

Il turismo trapanese nel nuovo contesto competitivo internazionale

2000

Il sistema dell’offerta di servizi turistici sui mercati turistici mondiali, richiede sempre di più l’intervento di un sistema coordinato di operatori, capaci di offrire occasioni di riposo di svago, di fruizione di bellezze naturali, e di visita e conoscenza dei siti archeologici. Da questo nuovo modo di concepire e rilevare la struttura dell’industria turistica presente nel territorio di Trapani, si vuole procedere per avviare un progetto turistico integrato da proporre nell’area con la finalità di rianimare e incrementare le presenze straniere nel territorio le quali rispetto altre regioni d’Italia risultano essere ancora oggi poco consistenti. E’ quindi indispensabile considerare degli …

Changes in nonvolatile flavours of blood and common orange fruits during cold storage.

2012

Maternal antibody transmission and breeding densities in the Black-headed Gull Larus ridibundus

2004

1. The offspring of avian species, especially those of colonial breeders, are exposed to a number of pathogens immediately after birth. The chick's immune system is, at that early stage still immature and inefficient. As a consequence, diseases can have a strong impact on chick survival.2. The ability of mothers to transmit passive immunity in terms of antibodies of their own acquired immunity to their chicks is probably an essential pathway to enhance the chick survival. Since the production of antibodies is costly, females are expected to adjust the transmission of passive immunity to the local disease environment.3. We found that in Black-headed Gulls (Larus ridibundus L.) yolk antibody …

Transgenerational immunity in a bird-ectoparasite system: do maternally transferred antibodies affect parasite fecundity or the offspring's susceptib…

2009

During egg formation, female birds deposit antibodies against parasites and pathogens they were exposed to before egg laying into the yolk. In captive bird species, it has been shown that these maternal immunoglobulins (maternal yolk IgGs) can protect newly hatched offspring against infection. However, direct evidence for such benefits in wild birds is hitherto lacking. We investigated (1) if nestling Great Tits Parus major originating from eggs with naturally high levels of maternal yolk IgG are less susceptible to a common, nest-based ectoparasite, (2) if maternal yolk IgGs influence nestling development and in particular, their own immune defence, and (3) if there is a negative correlati…

Antibody injection in the egg yolk: maternal antibodies affect humoral immune response of the offspring

2010

Summary 1. In vertebrate species, maternal antibodies specific for the pathogens to which mothers have been exposed can be transmitted to offspring before birth. This is assumed to be adaptive as these antibodies can be essential in protecting offspring early in life before their own immune system is fully developed. However, fitness consequences in natural conditions and the long-term effects of these mechanisms have yet to be fully examined. 2. Exploring the ecological and evolutionary implications of such maternal effects requires experimental manipulations to avoid potential confounding maternal effects. In birds, maternal antibodies are transmitted via the egg yolk – a self contained e…

BOTH MALE AND FEMALE SEXUAL ORNAMENTS REFLECT OFFSPRING PERFORMANCE IN A FISH

2010

Secondary sexual characters are often expressed in both sexes (mutual ornamentation), but are less often studied simultaneously. We studied the adaptive signaling function of male and female ornamentation in a mutually ornamented fish, the whitefish Coregonus lavaretus. In an experimental design in which nongenetic environmental effects were minimized, we found that highly ornamented females, males, and their parental combinations had offspring with better swimming performance and predator-avoidance ability than less ornamented individuals or combinations. Furthermore, highly ornamented females had larger offspring that also had higher yolk volume than less ornamented individuals. Offspring…