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Search Results: 1 - 10 of 14944 matches for " Andrea Carrà "
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Grey solitons in a strongly interacting superfluid Fermi Gas
Andrea Spuntarelli,Lincoln D. Carr,Pierbiagio Pieri,Giancarlo C. Strinati
Physics , 2010, DOI: 10.1088/1367-2630/13/3/035010
Abstract: The Bardeen-Cooper-Schrieffer to Bose-Einstein condensate (BCS to BEC) crossover problem is solved for stationary grey solitons via the Boguliubov-de Gennes equations at zero temperature. These \emph{crossover solitons} exhibit a localized notch in the gap and a characteristic phase difference across the notch for all interaction strengths, from BEC to BCS regimes. However, they do not follow the well-known Josephson-like sinusoidal relationship between velocity and phase difference except in the far BEC limit: at unitary the velocity has a nearly linear dependence on phase difference over an extended range. For fixed phase difference the soliton is of nearly constant depth from the BEC limit to unitarity and then grows progressively shallower into the BCS limit, and on the BCS side Friedel oscillations are apparent in both gap amplitude and phase. The crossover soliton appears fundamentally in the gap; we show, however, that the density closely follows the gap, and the soliton is therefore observable. We develop an approximate power law relationship to express this fact: the density of grey crossover solitons varies as the square of the gap amplitude in the BEC limit and a power of about 1.5 at unitarity.
Liquid Chromatography-Tandem Mass Spectrometry Analysis of Perfluorooctane Sulfonate and Perfluorooctanoic Acid in Fish Fillet Samples
Viviana Paiano,Elena Fattore,Andrea Carrà,Caterina Generoso,Roberto Fanelli,Renzo Bagnati
Journal of Analytical Methods in Chemistry , 2012, DOI: 10.1155/2012/719010
Abstract: Perfluorooctane sulfonate (PFOS) and perfluorooctanoic (PFOA) acid are persistent contaminants which can be found in environmental and biological samples. A new and fast analytical method is described here for the analysis of these compounds in the edible part of fish samples. The method uses a simple liquid extraction by sonication, followed by a direct determination using liquid chromatography-tandem mass spectrometry (LC-MS/MS). The linearity of the instrumental response was good, with average regression coefficients of 0.9971 and 0.9979 for PFOS and PFOA, respectively, and the coefficients of variation (CV) of the method ranged from 8% to 20%. Limits of detection (LOD) were 0.04?ng/g for both the analytes and recoveries were 90% for PFOS and 76% for PFOA. The method was applied to samples of homogenized fillets of wild and farmed fish from the Mediterranean Sea. Most of the samples showed little or no contamination by perfluorooctane sulfonate and perfluorooctanoic acid, and the highest concentrations detected among the fish species analyzed were, respectively, 5.96?ng/g and 1.89?ng/g. The developed analytical methodology can be used as a tool to monitor and to assess human exposure to perfluorinated compounds through sea food consumption. 1. Introduction Perfluorinated compounds (PFCs) are a large group of chemicals characterized by a fully fluorinated hydrophobic chain and an hydrophilic head. Such properties, in combination with a high chemical stability, make these compounds unique for their ability to repel both water and oils. Over the last 40 years PFCs have been produced for a large number of applications, such as surface treatments for coatings, clothes, carpets, packaging products, cookware, and food contact papers. Nowadays they are global contaminants which have been detected in environmental and biological samples from different areas worldwide [1–8]. Among these compounds, perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) seem to meet the criteria of persistence, biomagnifications, and long-distance transport to be included in the definition of persistent organic pollutants (POPs), under the Stockholm Convention; moreover they cause particular concern because they have been shown to be carcinogenic in experimental animals [9–11]. Detailed toxicological studies have suggested that peroxisome proliferation, hepatotoxicity, carcinogenicity, immunotoxicity, lipid metabolism, and developmental toxicity may be associated with chemical exposure to PFOS and PFOA [12–15]. Despite the fact that an increasing number of
Impulsiveness in patients with pathological love Avalia o de impulsividade em pacientes com amor patológico
Talita Vendrame,Andrea Lorena da Costa,Cintia Cristina Sanches,Daniel Carr Ribeiro Gulassa
Jornal Brasileiro de Psiquiatria , 2012, DOI: 10.1590/s0047-20852012000300013
Abstract:
Sex Differences and Emotion Regulation: An Event-Related Potential Study
Elyse K. T. Gardener, Andrea R. Carr, Amy MacGregor, Kim L. Felmingham
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0073475
Abstract: Difficulties in emotion regulation have been implicated as a potential mechanism underlying anxiety and mood disorders. It is possible that sex differences in emotion regulation may contribute towards the heightened female prevalence for these disorders. Previous fMRI studies of sex differences in emotion regulation have shown mixed results, possibly due to difficulties in discriminating the component processes of early emotional reactivity and emotion regulation. The present study used event-related potentials (ERPs) to examine sex differences in N1 and N2 components (reflecting early emotional reactivity) and P3 and LPP components (reflecting emotion regulation). N1, N2, P3, and LPP were recorded from 20 men and 23 women who were instructed to “increase,” “decrease,” and “maintain” their emotional response during passive viewing of negative images. Results indicated that women had significantly greater N1 and N2 amplitudes (reflecting early emotional reactivity) to negative stimuli than men, supporting a female negativity bias. LPP amplitudes increased to the “increase” instruction, and women displayed greater LPP amplitudes than men to the “increase” instruction. There were no differences to the “decrease” instruction in women or men. These findings confirm predictions of the female negativity bias hypothesis and suggest that women have greater up-regulation of emotional responses to negative stimuli. This finding is highly significant in light of the female vulnerability for developing anxiety disorders.
A Pilot Study on the New USDA Meal Pattern for School Breakfast in a Sample of First-Grade Students  [PDF]
Noelle Carr, Sibylle Kranz
Food and Nutrition Sciences (FNS) , 2012, DOI: 10.4236/fns.2012.39175
Abstract: Background: The United States Department of Agriculture (USDA) recently modified the school breakfast program (SBP) to improve children’s nutrition. Based on the new patterns, schools must offer larger amounts of fruits, grains, and proteins/meats to children; the amounts of fluid foods (milk and juice) remained the same. This study examined the effect of the new food pattern on student’s consumption and food cost. Methods: The amounts and cost of foods served and wasted for one week in first grade students attending two elementary schools (n = 812) were measured. One school received the current SBP pattern (control breakfast, average number of students attending breakfast n = 81), the other school’s breakfast reflected the proposed changes (test breakfast, n = 82). To test the hypothesis that the test breakfast leads to significantly increased food cost and food waste compared to the control breakfast, the weekly average amount of the served solid and fluid foods (grams and milliliters) as well as their waste were compared between the two groups using paired student’s t-test in STATA 11 (significance at p-value < 0.05). Results: Data confirmed the hypothesis in that the test breakfast was associated with significantly higher food cost (by approximately $100/week) and solid food waste but there was no change in milk and juice consumption. Conclusions: This exploratory study indicates that a significant portion of the additional foods served to first-graders to improve their nutritional status were not consumed but wasted. Further studies in larger samples and including students from all grades are needed to examine this issue fully.
Weather extremes from anthropogenic global warming  [PDF]
Paul H. Carr
Natural Science (NS) , 2013, DOI: 10.4236/ns.2013.51A020
Abstract:

Although sea levels are predicted to rise 1 to 2 meters by 2100, the more immediate effects of global warming are weather extremes. The number of natural disasters since 1996 costing $1 billion or more doubled compared with the previous 15-year period. Extreme summer heat anomalies now cover about 10% of land area, up from 0.2% in 1950-1980. The human influence on global warming is evident from climate data and physical modeling. Since the beginning of the industrial era, carbon dioxide (CO2) increases correlate with those of temperature. Carbon dating shows that the CO2 increase is from burning ancient fossil fuels. Increasing CO2 and other greenhouse gases blanket and warm the earth’s surface, allowing less heat to reach the stratosphere, which is cooling. This is consistent with satellite measurements showing that solar irradiance is not changing. The present CO2 rate increase of 2 ppm/year is 300 times higher than the rate at which the earth recovered from the ice age 18,000 years ago. Without the radiative forcing of noncondensing persistent CO2, the terrestrial greenhouse would collapse, plunging the global climate into an icebound earth state. Will new technologies lower our carbon emissions in time to prevent more weather extremes? Electric cars now get the equivalent of 100 miles per gallon. The cost of electricity from solar photovoltaic cells has reached grid parity.

Determination of Paclitaxel Distribution in Solid Tumors by Nano-Particle Assisted Laser Desorption Ionization Mass Spectrometry Imaging
Lavinia Morosi, Pietro Spinelli, Massimo Zucchetti, Francesca Pretto, Andrea Carrà, Maurizio D’Incalci, Raffaella Giavazzi, Enrico Davoli
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0072532
Abstract: A sensitive, simple and reproducible protocol for nanoparticle-assisted laser desorption/ionization mass spectrometry imaging technique is described. The use of commercially available TiO2 nanoparticles abolishes heterogeneous crystallization, matrix background interferences and enhances signal detection, especially in the low mass range. Molecular image normalization was based on internal standard deposition on tissues, allowing direct comparison of drug penetration and distribution between different organs and tissues. The method was applied to analyze the distribution of the anticancer drug paclitaxel, inside normal and neoplastic mouse tissue sections. Spatial resolution was good, with a linear response between different in vivo treatments and molecular imaging intensity using therapeutic drug doses. This technique distinguishes the different intensity of paclitaxel distribution in control organs of mice, such as liver and kidney, in relation to the dose. Animals treated with 30 mg/kg of paclitaxel had half of the concentration of those treated with 60 mg/kg. We investigated the spatial distribution of paclitaxel in human melanoma mouse xenografts, following different dosage schedules and found a more homogeneous drug distribution in tumors of mice given repeated doses (5×8 mg/kg) plus a 60 mg/kg dose than in those assigned only a single 60 mg/kg dose. The protocol can be readily applied to investigate anticancer drug distribution in neoplastic lesions and to develop strategies to optimize and enhance drug penetration through different tumor tissues.
GIOTTO
Carrà, Carlo;
ARS (S?o Paulo) , 2009, DOI: 10.1590/S1678-53202009000100013
Abstract: while commenting giotto's art, carrà enhances qualities as "freshness", "spontaneity", and a "rough plastic grace". he points out the differences between his position and those of other critics or commentators, such as the adherents of "certain pseudo primitivisms" or of "the theory derived from xvi century's platonism"; ruskin; marcel raymond; mason perkins. he states that, in order to apprehend the "humanity" of giotto's art, "instead of any aesthetic theory", a "pictorial sensibility" would be necessary. finally, carrà examines the decoration of the scrovegni chapel (padova, 1305), "where giotto's genius achieves its maximum splendor".
The Banco Central do Brasil's institutional framework after ten years
Carré, Emmanuel;
Revista de Economia Política , 2011, DOI: 10.1590/S0101-31572011000400006
Abstract: the banco central do brazil (bacen) adopted inflation targeting in 1999. this monetary policy regime originates in institutional design which remains crucial today for the expectations management, and is in permanent evolution. after 10 years, the bacen institutional framework is assessed, asking if there is still room for improvement. various institutional procedures are analysed, and lessons are drawn from the international experience of a panel of sixteen countries. some proposals for the bacen institutional framework are made.
Notes on the zoogeography of the Atlantic sea turtles of the genus Lepidochelys
Carr,Archie;
Revista de Biología Tropical , 2002,
Abstract: the sea turtle lepidochelys kempi has an extensive range in coastal waters of the united states, and in parts of florida is abundant as a seasonal resident. all known populations are sexually immature, and the breeding area of the species is not known. the present paper suggests the necessity of assuming a distant origin for the north american population, examines fragmentary evidence bearing on the coronary assumption of migratory movement, and somewhat hesitantly proposes the coast of northwestern africa as a possible site of nesting. spreading into american waters may occur via the gulf stream system. new records extend the range of the genus to northern mauretania and into the mediterranean
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