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Search Results: 1 - 10 of 297531 matches for " J. Lanfranchi "
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The Federal Government and Academic Texts as Barriers to Informed Consent
Lanfranchi, Angela
Journal of American Physicians and Surgeons , 2008,
Microscopic Model for the Scintillation-Light Generation and Light-Quenching in CaWO$_4$ single crystals
S. Roth,F. v. Feilitzsch,J. -C. Lanfranchi,W. Potzel,S. Sch?nert,A. Ulrich
Physics , 2015,
Abstract: Scintillators are employed for particle detection and identification using light-pulse shapes and light quenching factors. We developed a comprehensive model describing the light generation and quenching in CaWO$_4$ single crystals used for direct dark matter search. All observed particle-dependent light-emission characteristics can be explained quantitatively, light-quenching factors and light-pulse shapes are calculated on a microscopic basis. This model can be extended to other scintillators such as inorganic crystal scintillators, liquid noble gases or organic liquid scintillators.
Genetic Syndromes Causing Mental Retardation: deficit and surplus in school performance and social adaptability compared to cognitive capacity
Vianello, Renzo,Lanfranchi, Silvia
Life Span and Disability , 2009,
Abstract: In this paper we reported some results of research carried out in Italy with participants with Mental Retardation (better defined as Intellectual Developmental Disability) due to genetic syndromes (Down, Fragile-X, Cornelia de Lange and Prader-Willi), evidencing specific conditions characterized by deficit or ‘surplus’ in reading, writing and maths performances, and in social adjustment respect to the intellectual competencies. In some cases the comparison was made also with respect to abilities of memory and language. Results suggested that the cases of ‘surplus’ are in our context more frequent than those found in International literature, and this may be due to the positive effects of the integration in normal classrooms of most pupils with intellectual disabilities. A debate on these issues, comparing diverse cultural and social realities, is welcome.
Maurizio, Lanfranchi,Carlo, Giannetto
Management Strategies Journal , 2012,
Abstract: The survey on consumption of wine has been conducted in the period between April 20th and July 10th of 2011 on a sample of 200 consumers of Sicily. The recognition by the administration of the product was mainly conducted at some outlets, supermarkets, wine shops and bars, interviewing a sample of consumers directly with the method "face to face." The survey purpose was conducted to understand the needs of wine consumers and the role played by the mark of quality in the choice of purchase, and finally the degree of appreciation and consumption of Sicilian wine.
Revista de Turism : Studii si Cercetari in Turism , 2010,
Abstract: Tourism has represented one of the major sources of balance of trade earnings for many years in the most developed countries. According to estimates by the World Tourism Organization (WTO), world tourism flows will grow by 4-5% annually over the coming years, reaching in 2020 an estimated number of 1.6 billion international arrivals, of which 378 million will be short haul international travellers. With the passage of time demand will become more diversified and this will lead to the spread of “new tourism”, the search for new products and increasingly diverse offers, characterized by organized local tourist systems. This paper underlines the importance of the tourist district model as a strategic tool for creating innovative processes of endogenous development in a highly globalized framework, moreover it tries to highlight the peculiarities of tourist districts and their importance in overcoming the major limitations of the distribution chain. Therefore, the birth of the tourism district represents an important opportunity for the promotion of tourism development of different local realities.
Sensitivity of alkali halide scintillating calorimeters with particle identification to investigate the DAMA dark matter detection claim
Patrick Nadeau,Michael Clark,P. C. F. Di Stefano,J. -C. Lanfranchi,S. Roth,M. von Sivers,Itay Yavin
Physics , 2014, DOI: 10.1016/j.astropartphys.2015.02.001
Abstract: Scintillating calorimeters are cryogenic detectors combining a measurement of scintillation with one of phonons to provide particle identification. In view of developing alkali halide devices of this type able to check the DAMA/LIBRA claim for the observation of dark matter, we have simulated detector performances to determine their sensitivity by two methods with little model-dependence. We conclude that if performance of the phonon channel can be brought in line with those of other materials, an exposure of 10 kg-days would suffice to check the DAMA/LIBRA claim in standard astrophysical scenarios. Additionally, a fairly modest array of 5 kg with background rejection would be able to directly check the DAMA/LIBRA modulation result in 2 years.
Obstructive sleep apnea and vascular disease
Paola Lanfranchi, Virend A Somers
Respiratory Research , 2001, DOI: 10.1186/rr79
Abstract: Our understanding of OSA has evolved from regarding it as an interesting and occasionally annoying social curiosity to the recognition that OSA may act through various mechanisms to increase morbidity and mortality [1]. The health consequences of sleep apnea are especially evident in the cardiovascular system, where it is becoming increasingly apparent that untreated OSA may have direct and deleterious effects on cardiac and vascular structure and function. These effects may include subtle and subclinical impairment of normal homeostatic regulation, such as impaired baroreflex [2] and chemoreflex [3] functions, and elevated nocturnal blood pressure, in sleep apnea patients without any overt cardiovascular diseases. There is also evidence that untreated OSA may possibly contribute to the initiation and/or progression of pathophysiologic mechanisms involved in hypertension, heart failure, cardiac ischemia and stroke. The evidence and mechanisms linking OSA to vascular disease generally, and to hypertension and stroke in particular, are outlined below.OSA appears to be highly prevalent in the middle-aged general population, affecting 9% of females and 24% of males between the ages of 30 and 60 years [4]. Hypertension is also widespread in the middle-aged and older populations. It is therefore likely that there would be considerable co-morbidity of OSA and hypertension. Nevertheless, a number of studies suggest that the extent of this co-morbidity is substantially greater than would be expected in the absence of any causal interaction between these disease conditions.In studies in dogs, simulated sleep apnea (achieved by intermittent and repetitive airway occlusion during sleep) resulted in increased blood pressure during wakefulness [5]. A number of studies in humans have sought to determine the presence and extent of a causal interaction between OSA and hypertension, independent of frequently co-existing, and potentially confounding, variables common to both condition
G. A. Lanfranchi,F. Matteucci
Revista mexicana de astronomía y astrofísica , 2009,
Abstract: The chemical evolution of six local group dwarf spheroidal Galaxies is discussed based on studies performed with an one-zone chemical evolution model which is able to reproduce the main observational constraints of these galaxies. Several abundance ratios, the total mass, the gas mass and the metallicity distribution predicted by such models t the observed data very well. In our scenario, the evolution of the dSphs is mainly controlled by a low star formation rate and by very intense galactic winds. The low star formation in these galaxies gives rise to the observed low metallicities, whereas the intense galactic winds are responsible for the low nal gas mass and for the sharp decrease observed in the abundance ratios. Besides that, both parameters help in de ning the shape of the stellar metallicity distributions, in agreement with observations.
Clues to the nature of damped Lyman alpha systems from chemical evolution models
Gustavo A. Lanfranchi,Amancio Friaca
Physics , 2003, DOI: 10.1046/j.1365-8711.2003.06682.x
Abstract: The evolution of the metallicity of damped Lyman alpha systems (DLAs) is investigated in order to understand the nature of these systems. The observational data on chemical abundances of DLAs are analysed with robust statistical methods, and the abundances are corrected for dust depletion. The results of this analysis are compared to predictions of several classes of chemical evolution models: one-zone dwarf galaxy models, multizone disk models, and chemodynamical models representing dwarf galaxies. We compare the observational data on the [alpha/Fe] and [N/alpha] ratios to the predictions from the models. In DLAs, these ratios are only partially reproduced by the dwarf galaxy one-zone model and by the disk model. On the other hand, the chemodynamical model for dwarf galaxies reproduces the properties of nearly all DLAs. We derive the formation epoch of dwarf galaxies, and we find that dwarf galaxies make a significant contribution to the total neutral gas density in DLAs, and that this contribution is more important at high redshifts (z > 2-3). We propose a scenario in which the DLA population is dominated by dwarf galaxies at high redshifts and by disks at lower redshifts. We also find that Lyman Break Galaxies (LBGs) may constitute a sequence rather than present a sharp dichotomy between the two populations. We also arise the possibility that we could be missing a whole population of high HI density column objects, with metallicities intermediate between those of DLAs and LBGs. Finally, we discuss the possibility that relying only on the observations of DLAs could lead to an underestimate of the metal content of the high redshift Universe.
Chemical Evolution of Dwarf Spheroidal and Blue Compact Galaxies
Gustavo A. Lanfranchi,Francesca Matteucci
Physics , 2003, DOI: 10.1046/j.1365-8711.2003.06919.x
Abstract: We studied the chemical evolution of Dwarf Spheroidal (dSph) and Blue Compact Galaxies (BCGs) by means of comparison between the predictions of chemical evolution models and several observed abundance ratios. Detailed models with up to date nucleosynthesis taking into account the role played by supernovae of different types (II, Ia) were developed for both types of galaxies allowing us to follow the evolution of several chemical elements. The models are specified by the prescriptions of the star formation (SF) and galactic wind efficiencies chosen to reproduce the main features of these galaxies. We also investigated a possible connection in the evolution of dSph and BCGs and compared the predictions of the models to the abundance ratios observed in Damped Lyman alpha Systems (DLAs). The main conclusions are: i) the observed distribution of [alpha/Fe] vs. [Fe/H] in dSph is mainly a result of the SF rate coupled with the wind efficiency; ii) a low SF efficiency and a high wind efficiency are required to reproduce the observational data for dSph; iii) the low gas content of these galaxies is the result of the combined action of gas consumption by SF and gas removal by galactic winds; iv) the BCGs abundance ratios are reproduced by models with 2 to 7 bursts of SF with low efficiencies ; v) the low values of N/O observed in BCGs are the natural result of a bursting SF; vi) a connection between dSph and BCGs in an unified evolutionary scenario is unlikely; vii) the models for the dSph and BCGs imply different formation scenarios for the DLAs; viii) a suitable amount of primary N produced in massive stars can be perhaps an explanation for the low plateau in the [N/$\alpha$] distribution observed in DLAs, if real.
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