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Search Results: 1 - 10 of 144157 matches for " B. Delmonte "
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Interpreting last glacial to Holocene dust changes at Talos Dome (East Antarctica): implications for atmospheric variations from regional to hemispheric scales
S. Albani,B. Delmonte,V. Maggi,C. Baroni
Climate of the Past Discussions , 2012, DOI: 10.5194/cpd-8-145-2012
Abstract: Central East Antarctica ice cores preserve stratigraphic records of mineral dust originating from remote sources in the Southern Hemisphere, and represent useful indicators of climatic variations on glacial-interglacial time scales. The peripheries of the East Antarctic Ice Sheet, where ice-free areas with the potential to emit dust exist, have been less explored from this point of view. Here we present a new profile of dust deposition flux and grain size distributions from an ice core drilled at Talos Dome (Northern Victoria Land, East Antarctica), where there is a significant input of dust from proximal Antarctic ice-free areas. We analyze dust and stable water isotopes variations from the Last Glacial Maximum to the Late Holocene, and compare them to the EPICA Dome C profiles from Central East Antarctica. The smaller glacial-interglacial variations at Talos Dome compared to Dome C, and a distinctive decreasing trend during the Holocene, characterize the TALDICE dust profile. By deciphering the composite dust signal from both remote and local sources, we show the potential of this combined proxy of source activity and atmospheric transport to give information on both regional and larger spatial scales. In particular, we show how a regional signal, which we related to the deglaciation history of the Ross Sea embayment, can be superimposed to the broader scale glacial-interglacial variability that characterizes other Antarctic sites.
Interpreting last glacial to Holocene dust changes at Talos Dome (East Antarctica): implications for atmospheric variations from regional to hemispheric scales
S. Albani, B. Delmonte, V. Maggi, C. Baroni, J.-R. Petit, B. Stenni, C. Mazzola,M. Frezzotti
Climate of the Past (CP) & Discussions (CPD) , 2012,
Abstract: Central East Antarctic ice cores preserve stratigraphic records of mineral dust originating from remote sources in the Southern Hemisphere, and represent useful indicators of climatic variations on glacial-interglacial time scales. The peripheries of the East Antarctic Ice Sheet, where ice-free areas with the potential to emit dust exist, have been less explored from this point of view. Here, we present a new profile of dust deposition flux and grain size distributions from an ice core drilled at Talos Dome (TALDICE, Northern Victoria Land, East Antarctica), where there is a significant input of dust from proximal Antarctic ice-free areas. We analyze dust and stable water isotopes variations from the Last Glacial Maximum to the Late Holocene, and compare them to the EPICA Dome C profiles from central East Antarctica. The smaller glacial-interglacial variations at Talos Dome compared to Dome C and a distinctive decreasing trend during the Holocene characterize the TALDICE dust profile. By deciphering the composite dust signal from both remote and local sources, we show the potential of this combined proxy of source activity and atmospheric transport to give information on both regional and larger spatial scales. In particular, we show how a regional signal, which we relate to the deglaciation history of the Ross Sea embayment, can be superimposed to the broader scale glacial-interglacial variability that characterizes other Antarctic sites.
Change in dust variability in the Atlantic sector of Antarctica at the end of the last deglaciation
A. Wegner, P. Gabrielli, D. Wilhelms-Dick, U. Ruth, M. Kriews, P. De Deckker, C. Barbante, G. Cozzi, B. Delmonte,H. Fischer
Climate of the Past (CP) & Discussions (CPD) , 2012,
Abstract: We present a Rare Earth Elements (REE) record determined on the EPICA ice core drilled at Dronning Maud Land (EDML) in the Atlantic sector of the East Antarctic Plateau. The record covers the transition from the last glacial stage (LGS) to the early Holocene (26 600–7500 yr BP) at decadal to centennial resolution. Additionally, samples from potential source areas (PSAs) for Antarctic dust were analyzed for their REE characteristics. The dust provenance is discussed by comparing the REE fingerprints in the ice core and the PSA samples. We find a shift in variability in REE composition at ~15 000 yr BP in the ice core samples. Before 15 000 yr BP, the dust composition is very uniform and its provenance was most certainly dominated by a South American source. After 15 000 yr BP, multiple sources such as Australia and New Zealand become relatively more important, although South America remains the major dust source. A similar change in the dust characteristics was observed in the EPICA Dome C ice core at around ~15 000 yr BP, accompanied by a shift in the REE composition, thus suggesting a change of atmospheric circulation in the Southern Hemisphere.
Sulphate and chloride aerosols during Holocene and last glacial periods preserved in the Talos Dome Ice Core, a peripheral region of Antarctica
Yoshinori Iizuka,Barbara Delmonte,Ikumi Oyabu,Torbj?RN Karlin
Tellus B , 2013, DOI: 10.3402/tellusb.v65i0.20197
Abstract: Antarctic ice cores preserve the record of past aerosols, an important proxy of past atmospheric chemistry. Here we present the aerosol compositions of sulphate and chloride particles in the Talos Dome (TD) ice core from the Holocene and Last Glacial Period. We find that the main salt types of both periods are NaCl, Na2SO4 and CaSO4, indicating that TD ice contains relatively abundant sea salt (NaCl) from marine primary particles. By evaluating the molar ratio of NaCl to Na2SO4, we show that about half of the sea salt does not undergo sulphatisation during late Holocene. Compared to in inland Antarctica, the lower sulphatisation rate at TD is probably due to relatively little contact between sea salt and sulphuric acid. This low contact rate can be related to a reduced time of reaction for marine-sourced aerosol before reaching TD and/or to a reduced post-depositional effect from the higher accumulation rate at TD. Many sulphate and chloride salts are adhered to silicate minerals. The ratio of sulphate-adhered mineral to particle mass and the corresponding ratio of chloride-adhered mineral both increase with increasing dust concentration. Also, the TD ice appears to contain Ca(NO3)2 or CaCO3 particles, thus differing from aerosol compositions in inland Antarctica, and indicating the proximity of peripheral regions to marine aerosols.
Social and monetary reward processing in autism spectrum disorders
Delmonte Sonja,Balsters Joshua H,McGrath Jane,Fitzgerald Jacqueline
Molecular Autism , 2012, DOI: 10.1186/2040-2392-3-7
Abstract: Background Social motivation theory suggests that deficits in social reward processing underlie social impairments in autism spectrum disorders (ASD). However, the extent to which abnormalities in reward processing generalize to other classes of stimuli remains unresolved. The aim of the current study was to examine if reward processing abnormalities in ASD are specific to social stimuli or can be generalized to other classes of reward. Additionally, we sought to examine the results in the light of behavioral impairments in ASD. Methods Participants performed adapted versions of the social and monetary incentive delay tasks. Data from 21 unmedicated right-handed male participants with ASD and 21 age- and IQ-matched controls were analyzed using a factorial design to examine the blood-oxygen-level-dependent (BOLD) response during the anticipation and receipt of both reward types. Results Behaviorally, the ASD group showed less of a reduction in reaction time (RT) for rewarded compared to unrewarded trials than the control group. In terms of the fMRI results, there were no significant group differences in reward circuitry during reward anticipation. During the receipt of rewards, there was a significant interaction between group and reward type in the left dorsal striatum (DS). The ASD group showed reduced activity in the DS compared to controls for social rewards but not monetary rewards and decreased activation for social rewards compared to monetary rewards. Controls showed no significant difference between the two reward types. Increased activation in the DS during social reward processing was associated with faster response times for rewarded trials, compared to unrewarded trials, in both groups. This is in line with behavioral results indicating that the ASD group showed less of a reduction in RT for rewarded compared to unrewarded trials. Additionally, de-activation to social rewards was associated with increased repetitive behavior in ASD. Conclusions In line with social motivation theory, the ASD group showed reduced activation, compared to controls, during the receipt of social rewards in the DS. Groups did not differ significantly during the processing of monetary rewards. BOLD activation in the DS, during social reward processing, was associated with behavioral impairments in ASD.
Dr. Fernando Pagés Larraya (1923 - 2007)
Silvia M. Balzano,Emilse Barrial Delmonte,Lina Grasso,Pablo Sanz
Interdisciplinaria , 2008,
Abstract:
A soft magnetic material for power supply systems of high energy physics experiments
Baccaro S.,Cova P.,Delmonte N.,Ghisolfi E.
EPJ Web of Conferences , 2013, DOI: 10.1051/epjconf/20134017005
Abstract: Most of the high energy physics experiments require their detectors to be embedded in a high intensity magnetic field. In particular the biggest of them, ATLAS, running in the CERN Large Hadron Collider (LHC) particle accelerator, generates a field of 2 T by means of a gigantic toroidal magnet working in open air. Its future phase 2 upgrade plans to move the DC/DC power supplies from the present positions on the external balconies directly on the detectors, where the field is of the order of 1 T. This presentation describes the development of samples made of special magnetic material for inductor cores suitable to work in such an environment. Starting from iron-silicon powders, at FN plant a plastic forming process, based on powder extrusion, injection moulding and sintering, was developed. To get the best compromise between the forming process requirements (good coupling among the metallic powder and the organic components to assure the right mouldability) and the debinding and sintering conditions, several mixtures (with different percentages and kind of organic additives) were experimented. A proper mould was designed and realized to get torous-shaped prototypes. The preliminary results of the physical-microstructural characterization performed on the first prototypes made will be shown.
Seasonality and Sleep: A Clinical Study on Euthymic Mood Disorder Patients
Chiara Brambilla,Chiara Gavinelli,Dario Delmonte,Mara Cigala Fulgosi,Barbara Barbini,Cristina Colombo,Enrico Smeraldi
Depression Research and Treatment , 2012, DOI: 10.1155/2012/978962
Abstract: Background. Research on mood disorders has progressively focused on the study of seasons and on the mood in association with them during depressive or manic episodes yet few studies have focused on the seasonal fluctuation that characterizes the patient's clinical course both during an illness episode and during euthymic periods. Methods. 113 euthymic outpatients 46 affected by major recurrent depression and 67 affected by bipolar disorder were recruited. We evaluated the impact of clinical “rhythmical” factors: seasonality, sleep disturbance, and chronotype. Patients completed the SPAQ questionnaire, the MEQ questionnaire, and the medical outcomes study (MOS) sleep scale. We used t-test analyses to compare differences of clinical “rhythmical” and sociodemographic variables and of differences in the assessment scales among the diagnostic groups. Results. Patients reporting a family history for mood disorders have higher fluctuations throughout seasons. Sleep disturbance is more problematic in unipolars when compared to bipolars. Conclusions. Sleep, light, and seasonality seem to be three interconnected features that lie at the basis of chronobiology that, when altered, have an important effect both on the psychopathology and on the treatment of mood disorders. 1. Introduction The degree to which seasonal changes affect mood is known as seasonality. The periodical pattern of recurrence is a biological feature of mood disorders, and the recovery from the first episode of illness is followed by a subsequent recurrence in about 90% of affected patients during their lifetime [1]. In addition, the occurrence of diurnal variations in mood and of distressful and pervasive disruption in sleep suggests a primary disturbance of biological rhythms for mood disorders [2]. The typical pattern of recurrence of mood disorder follows interindividual rules, since each patient presents their own specific pattern with a few episodes during their life, or more than four episodes each year (rapid cycler). Some authors have stressed the concept of seasonality, as many patients show critical months of the year when they tend to have a new recurrence independent of polarity [3]. The recurrence pattern is also affected by external factors, such as exposition to light which appears to have an antidepressant effect both on its own and when associated to acute pharmacological treatments, which shorten the subsequent cycle of illness [4] and maintenance treatments, which are expected to decrease the episode rates. Mood stabilizers, the first choice of treatment for bipolar disorder,
Uso de dois penetr?metros na avalia??o da resistência mecanica de um latossolo vermelho distrófico
Roboredo, Delmonte;Maia, Jo?o C. de S;Oliveira, Osvaldo J. de;Roque, Cassiano G;
Engenharia Agrícola , 2010, DOI: 10.1590/S0100-69162010000200013
Abstract: soil compaction is a problem that interferes in root growth and crop production. this study was conducted in the experimental station of centro federal de educa??o tecnológica of cuiabá (cefet), in santo antonio do leverger - mt, brazil. the aim was to evaluate the cone index of the distrophic red latosol in function of different water levels in two depths, by using a constant speed penetrometer and an impact one, correlating them with the soil density. the design was made of randomized blocks with eight treatments and five replications, arranged by split plots, with four bands of soil water content in the plots: range 1 (0.1883 to 0.2354 m3 m-3); range 2 (0.2355 to 0.2544 mm-3); range 3 (0.2545 to 0.2702 mmand range 4 (0.2703 to 0.3177 m3 m-3), and two depths of sampling like subplots (0.05 to 0.10 m and 0.15 to 0.20 m). from the results it was found that: i) the penetrometers showed significant positive correlation with the soil density; ii) the impact penetrometer presented the highest soil strength.
Teste de concordancia de scripts: uma proposta para a avalia??o do raciocínio clínico em contextos de incerteza
Piovezan, Ronaldo Delmonte;Custódio, Osvladir;Cendoroglo, Maysa Seabra;Batista, Nildo Alves;
Revista Brasileira de Educa??o Médica , 2010, DOI: 10.1590/S0100-55022010000100002
Abstract: little research has been done in brazilian medical education on the evaluation of clinical reasoning in situations of uncertainty. the most common tests are still multiple-choice, which are capable of evaluating skills when dealing with well-defined problems. however, in practice the majority of situations involve uncertainties. a method for the evaluation of clinical reasoning in contexts of uncertainty was developed on the basis of the cognitive script theory in relation to professional reasoning. the objectives of the research were to develop, apply, and analyze this methodology in a brazilian educational setting, based on clinical situations in geriatrics that involved diagnostic, therapeutic, or ethical dilemmas. a group of specialists in this area and a group of undergraduate students that were completing their training in the geriatrics internship took the test. comparison of the results led to evidence of the instrument's validity, capable of distinguishing clinical reasoning according to the participants' level of experience. the mean score for the specialists (80,41) was higher than that of students (70,71) (p < 0,001). in addition, analyses of the internal consistency and a g study design furnished results that are consistent with a scoring system that seeks to evaluate a professional skill. in conclusion, a proposal for a script concordance test in the portuguese language, applied in a brazilian teaching institution, may be a viable alternative for evaluating clinical reasoning in contexts of uncertainty.
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