Coherent search of continuous gravitational wave signals: extension of the 5-vectors method to a network of detectors

We describe the extension to multiple datasets of a coherent method for the search of continuous gravitational wave signals, based on the computation of 5-vectors. In particular, we show how to coherently combine different datasets belonging to the same detector or to different detectors. In the latter case the coherent combination is the way to have the maximum increase in signal-to-noise ratio. If the datasets belong to the same detector the advantage comes mainly from the properties of a quantity called {\it coherence} which is helpful (in both cases, in fact) in rejecting false candidates. The method has been tested searching for simulated signals injected in Gaussian noise and the results of the simulations are discussed.Comment: 9 pages, 2 figures. Journal of Physics: Conference Series, in pres

A method for narrow-band searches of continuous gravitational wave signals

Targeted searches of continuous waves from spinning neutron stars normally assume that the frequency of the gravitational wave signal is at a given known ratio with respect to the rotational frequency of the source, e.g. twice for an asymmetric neutron star rotating around a principal axis of inertia. In fact this assumption may well be invalid if, for instance, the gravitational wave signal is due to a solid core rotating at a slightly different rate with respect to the star crust. In this paper we present a method for {\it narrow-band} searches of continuous gravitational wave signals from known pulsars in the data of interferometric detectors. This method assumes source position is known to high accuracy, while a small frequency and spin-down range around the electromagnetic-inferred values is explored. Barycentric and spin-down corrections are done with an efficient time-domain procedure. Sensitivity and computational efficiency estimates are given and results of tests done using simulated data are also discussed.Comment: 13 pages; 6 figures; accepted in PR

Recreational fishing on the West coast of the Northern Adriatic Sea (Western Mediterranean) and its possible ecological implications

The marine recreational fishing (MRF) represents one of the most popular activities along the coasts of numerous countries around the world, in particular in the Mediterranean Sea. Despite the evidences of potential effects on the marine biodiversity and commercially exploited stocks, a sound information base and adequate management plans are still lacking, both at the national and basin level. An analysis of the MRF on the West coasts of the Adriatic Sea was carried out, in 2014, by using a standardized questionnaires approach, aiming to describe the state of the art and to preliminarily assess catches, in comparison with the commercial ones, at the regional scale. Gilt-headed seabream, European seabass, cuttlefish, squid and Atlantic bluefin tuna resulted the anglers' preferred species, even if the top five in term of caught biomass were bluefin tuna, seabream, cuttlefish, common dolphinfish and little tunny, in the order (accounting up to 60% of total catches). The exploitation level resulted to be significant, as confirmed by the comparison with commercial fisheries, being the MRF captures 30% or 45% of the artisanal fishery in the same area, with some species, such as bluefish, bonito, pandora and picarel, showing larger values. The preliminary assessment of ecological effects, highlighted that the exploitation use about 10%-16% of energy fixed by the primary production (Primary Production Required to sustain fishery), but the ecosystem effects are still sustainable (Lindex and probability to be sustainable fished). However, combining catches by MRF with those by small scale fishery completely changes the situation, showing an unsustainable condition, suggesting the need for taking into the account also MRF in the future management planning for the Adriatic coastal area. (C) 2015 Elsevier B.V. All rights reserved

Obtenção e aplicação de biossurfactantes

Biossurfactantes são compostos ativos em superfícies produzidos por microrganismos e que têm recebido crescente interesse nas últimas décadas pelas vantagens que possuem sobre os surfactantes químicos, tais como biodegrabilidade, baixa toxicidade, produção a partir de fontes renováveis, funcionalidade sob condições extremas de pH e temperatura, estabilidade, entre outros. O potencial de aplicação dos biossurfactantes baseia-se em suas propriedades funcionais, que incluem emulsificação, de-mulsificação, separação, solubilização e redução da tensão superficial. Essas propriedades são aplicadas na agricultura, na construção civil, em indústrias de alimentos, papel, metal, têxteis e farmacêuticas, apresentando seu maior potencial de aplicação na indústria petrolífera, principalmente na limpeza de tanques, na recuperação melhorada de petróleo e em casos de biorremediação, como em derramamentos de óleos em ecossistemas aquáticos. Os microrganismos para a produção de biossurfactantes podem ser bactérias, fungos filamentosos ou leveduras, sendo os principais tipos de biossurfactantes produzidos, os glicolipídios, fosfolipídios, lipossacarídios, lipopeptídios, ácidos graxos e lipídios neutros. Objetiva-se neste artigo revisar os principais aspectos envolvidos na obtenção dos biossurfactantes, os tipos de biossurfactantes produzidos e o potencial de aplicação dos mesmos. Palavras-chave: biossurfactantes, biorremediação, microrganismos. ABSTRACT Application and obtention of biosurfactants Biosurfactants are biological surface-active compounds produced by microorganisms that have been gaining prominence in the last decades due to their advantagens of biodegradability, low toxicity, production on renewable resources, functionality under extreme conditions of pH and temperature, stability and many others. These potential are based on their functional properties of emulsification, de-mulsification, separation, solubilization and surface tension reduction. It presents apllications in many industries as food, cosmetic, pharmaceutical, metal, textile, paper and in the petrol industry, mainly in oil storage tank clean-up, enhanced oil-recovery and oil pollution control. The biosurfactants-producing microorganisms can be bacteria, yeasts and molds, which can produce many kinds of biosurfactants, as glicolipids, phospholipids, liposaccharides, lipopeptides, fatty acids and neutral lipids. The purpose of this paper was to review the principal aspects involved in the obtention of biosurfactants, the biosurfactant-producing microorganisms and their potential of application. Key-words: biosurfactants, bioremediation, microorganisms

Analoghi chinossalinici omologhi del thymitaq e 2-(ariltio)chinossaline analoghe del trimetrexato e del metotrexato

Abbiamo progettato una nuove serie di chinossaline le quali possono comportarsi come bioisosteri delle pteridine e delle chinazoline dotate di attività antifolica, apparse recentemente in letteratura