Search results for "NIP"

Can lake restoration by fish removal improve the status of profundal macroinvertebrate assemblages?

2013

Summary Removal of fish to restore lake pelagic food webs and water quality has been shown to increase the abundance of benthic invertebrates in shallow areas due to decreased predation pressure, while responses of profundal macroinvertebrate assemblages are less well documented. We used multivariate analyses and a Before-After-Control-Impact design to assess the impacts of fish removal (in total 101 000 kg of percid and cyprinid fish) on profundal macroinvertebrate species composition and abundance and ecological status in two basins of a eutrophic boreal lake. In the deeper main basin, macroinvertebrate community composition and classification of ecological status were not affected by fis…

Fluorescence and spin properties of defects in single digit nanodiamonds

2009

International audience; This article reports stable photoluminescence and high-contrast optically detected electron spin resonance (ODESR) from single nitrogen-vacancy (NV) defect centers created within ultrasmall, disperse nanodiamonds of radius less than 4 nm. Unexpectedly, the efficiency for the production of NV fluorescent defects by electron irradiation is found to be independent of the size of the nanocrystals. Fluorescence lifetime imaging shows lifetimes with a mean value of around 17 ns, only slightly longer than the bulk value of the defects. After proper surface cleaning, the dephasing times of the electron spin resonance in the nanocrystals approach values of some microseconds, …

HANSEN, Folker (2015): La economía del cáñamo en la España suroriental. El cultivo, manipulación y transformación del cáñamo en su significado para l…

2018

Effect of Pulsed Electric Field Pretreatment on Drying Kinetics, Color, and Texture of Parsnip and Carrot.

2018

The aim of the study was to evaluate the effect of pulsed electric field (PEF) pretreatment on drying kinetics and on color and textural changes in sliced parsnip and carrot. Cell disintegration index measured in parsnips after PEF pretreatment significantly differed from the ones measured for carrots and, consequently, the reduction of the time needed to dry both samples to a final moisture content up to 5% (wet basis). The drying time of the PEF pretreated parsnip was reduced by up to 28% at 70 °C and by up to 21% at 60 °C in carrot, in comparison to untreated samples. The PEF pretreatment influenced the effective diffusivity of water into the samples going from 50 °C to 70 °C: in carrots…

A multivariate analysis of phytoplankton and food web changes in a shallow biomanipulated lake

1996

1. Phytoplankton dynamics, food chain changes and resilience in Lake Zwemlust, a shallow lake in The Netherlands, are described for the period 1986-94. 2. After biomanipulation in 1987, the lake moved through two alternative states, while the external nutrient loadings were maintained. A clear-water phase, mostly dominated by macrophytes, persisted from 1987 to 1991, and a rather turbid state, dominated by algae, occurred in the summers of 1992-94, after several consecutive and sustained perturbations affecting different parts of the food web in the lake. These two periods were characterized by different community structures. 3. The phytoplankton assemblage gradually changed in a pattern th…

A uniform quantificational logic for algebraic notions ofcontext

2002

A quantificational framework of formal reasoning is proposed, which emphasises the pattern of entering and exiting context. Contexts are modelled by an algebraic structure which reflects the order and manner in which context is entered into and exited from. The equations of the algebra partitions context terms into equivalence classes. A formal semantics is defined, containing models that map equivalence classes of certain context terms to sets of first order structures. The corresponding Hilbert system incorporates the algebraic equations as axioms asserted in context. In this way a uniform logic for arbitrary algebras of context is obtained. Soundness and completeness are proved. In semig…

Effects of GABA-transporter (GAT) inhibitors on rat behaviour in open-field and elevated plus-maze.

1999

The behavioural consequences of inhibition of gamma-aminobutyric acid (GABA) uptake were studied. Two GABA uptake inhibitors, tiagabine and SKF 89976-A, were administered to rats, and behaviour was analysed 30 min later in a standard open field, an enriched open field, and an elevated plus-maze. Eight groups of animals received either saline (0.9%), tiagabine, or SKF 89976-A. At a dose of 18.5 mg/kg, tiagabine, an established antiseizure drug, impaired motor coordination, enhanced exploratory activity and reduced anxiety related behaviour. SKF 89976-A exhibited minimal effects over the dose range tested. These results indicate that inhibition of GABA uptake might be a pharmacological strate…

Static Test with GPS, Glonass and EGNOS Receivers

2012

In this work the author show the results of testing conducted in last few years within the network of University of Palermo called UNIPA NRTK GNSS. The University of Palermo, in order to carry out scientific tests on the use of CORS networks for real time positioning, have realized a network of reference stations. The network was set up during a National Research Scientific Project entitled: "Networks of permanent GPS stations for survey in real time control and use of emergency" and was the first made in Sicily for scientific GNSS-NRTK research but is also used for topographic and cartographic applications. The goal of the work is to verify the reliability of the network infrastructure (su…

Approccio differenziato per la validazione dei dati GPS provenienti dalla rete UNIPA

2011

In questo lavoro ci si è proposti la verifica di qualità iniziale e la successiva elaborazione delle osservazioni provenienti dalle stazioni permanenti appartenenti alla rete dell’Università di Palermo, creata nell’ambito del progetto PRIN2005 dal titolo: “Reti di stazioni permanenti GPS per il rilievo in tempo reale in impieghi di controllo e emergenza” e gestita dal Dipartimento di Ingegneria Civile, Ambientale e Aerospaziale. Tale rete attualmente è formata da nove stazioni permanenti localizzate presso la Facoltà di Ingegneria dell’Università di Palermo e altri istituti o enti pubblici presenti nelle località di Termini Imerese (PA), Trapani, Agrigento, Caltanissetta, Partinico (PA), Ca…

New records of gall-inducer and inquiline insects in a few mediterranean countries, with biological notes

2014

An annotated list of some gall-inducing and inquiline insects found on herbaceous plants and trees in Italy and in other few Mediterranean countries is reported. Among the gall-inducer species, Phanacis phoenixopodos (Mayr, 1882) is new for the Italian peninsula, Callirhytis rufescens (Mayr, 1882), Andricus quercusramuli (L., 1761) and Plagiotrochus amenti Kieffer, 1901 (Cynipidae: Hymenoptera) are new for Sicily; the latter was previously cited from Italy without collecting data. Oecocecis guyonella Guenée, 1870 was found in Libya and Amblypalpis olivierella Ragonot, 1886 (Gelechiidae: Lepidoptera) in Jordan, Libya, Northern Yemen, and the United Arab Emirates. In addition, Saphonecrus gal…