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Search Results: 1 - 10 of 14032 matches for " Andrea Addazi "
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External stability for Spherically Symmetric Solutions in Lorentz Breaking Massive Gravity
Andrea Addazi,Salvatore Capozziello
Physics , 2014, DOI: 10.1007/s10773-014-2387-z
Abstract: We discuss spherically symmetric solutions for point-like sources in Lorentz-breaking massive gravity theories. This analysis is valid for St\"uckelberg's effective field theory formulation, for Lorentz Breaking Massive Bigravity and general extensions of gravity leading to an extra term $-Sr^{\gamma}$ added to the Newtonian potential. The approach consists in analyzing the stability of the geodesic equations, at the first order (deviation equation). The main result is a strong constrain in the space of parameters of the theories. This motivates higher order analysis of geodesic perturbations in order to understand if a class of spherically symmetric Lorentz-breaking massive gravity solutions, for self-gravitating systems, exists. Stable and phenomenologically acceptable solutions are discussed in the no-trivial case $S\neq 0$.
DAMA annual modulation effect and asymmetric mirror matter
A. Addazi,Z. Berezhiani,R. Bernabei,P. Belli,F. Cappella,R. Cerulli,A. Incicchitti
Physics , 2015, DOI: 10.1140/epjc/s10052-015-3634-z
Abstract: The long-standing model-independent annual modulation effect measured by DAMA Collaboration is examined in the context of asymmetric mirror dark matter, assuming that dark atoms interact with target nuclei in the detector via kinetic mixing between mirror and ordinary photons, both being massless. The relevant ranges for the kinetic mixing parameter are obtained taking into account various existing uncertainties in nuclear and particle physics quantities as well as characteristic density and velocity distributions of dark matter in different halo models.
Integration of Highly Qualified Sub-Saharan Immigrants in Prague  [PDF]
Andrea Gerstnerová
Sociology Mind (SM) , 2011, DOI: 10.4236/sm.2011.12006
Abstract: Successful integration of immigrants into the host society demands a creation of specific conditions that would facilitate immigrants their adaptation to a new sociocultural, economic and political environment. Therefore, the process of integration itself is not only a task for immigrants, but also for a majority. One of the key factors for a creation of truly cohesive society is the support of positive aspects of mutual inter-cultural relations. This could be reinforced by implementation of “adequate” integration programs adapted to the local context as well as sensible use of mass media. If the host society does not dispose of effective instruments to integrate its “own citizens”, it is generally difficult to create strategies for insertion of immigrants of different cultural backgrounds (such as Sub-Saharan Africans). Basic features of the integration process of Sub-Saharan Africans and political reactions of the major society were identified in Prague, Paris, London and Liege.
Undesired Excess Capacity and Equilibrium in an Advanced Market Economy  [PDF]
Andrea Pannone
Modern Economy (ME) , 2013, DOI: 10.4236/me.2013.411079
Abstract:

In this paper I attempt to give theoretical foundation to the concept of undesired excess capacity that I define as an unwilling, persistent mismatch between productive capacity and final demand. Undesired excess capacity has traditional room only in oligopolistic framework, like in Keynesian and Post-Keynesian models. Otherwise I show the possibility of its existence (and persistence) also with reference to a perfectly competitive economy where firms use massively information and communication technologies (ICT). In this stylized economy, undesired excess capacity is associated with “ex-post sunk costs, in terms of mismatch between total revenues and production costs. My approach, which draws a production theory alternative to the neoclassical one, makes it possible to account for these costs and connect them to the role of money, under the form of credit, in the continuation of the economic process. Moreover, in the conclusion of this paper, I show how the notion of equilibrium that emerges from the analysis could be useful to address the issue of dynamics.

Lerner Index, Productive Efficiency and Homotheticity  [PDF]
Andrea Mantovi
Theoretical Economics Letters (TEL) , 2015, DOI: 10.4236/tel.2015.53042
Abstract: Chambers et al. (2014) set forth a decomposition of the Lerner index, which results in a function on the full space \"\"?of input and output prices and quantities, such that the effect of the Farrell output measure of technical efficiency is explicit. In close correspondence, a decomposition of the Lerner index is established in which allocative efficiency (in both standard and reversed form, as defined by Bogetoft et al., 2006) complements the effect of input technical efficiency, with the reversed decomposition bound to the hypothesis of homotheticity. The resulting functions on \"\"are conjectured to define pregnant perspectives on the benchmark relevance of homothetic models, and their generalizations to multiple output.
Spherical Casimir Effect for a Massive Scalar Field on the Three Dimensional Ball  [PDF]
Andrea Erdas
Journal of Modern Physics (JMP) , 2015, DOI: 10.4236/jmp.2015.68115
Abstract: The zeta function regularization technique is used to study the Casimir effect for a scalar field of mass m satisfying Dirichlet boundary conditions on a spherical surface of radius a. In the case of large scalar mass, \"\", simple analytic expressions are obtained for the zeta function and Casimir energy of the scalar field when it is confined inside the spherical surface, and when it is confined outside the spherical surface. In both cases the Casimir energy is exact up to order \"\"and contains the expected divergencies, which can be eliminated using the well established renormalization procedure for the spherical Casimir effect. The case of a scalar field present in both the interior and exterior region is also examined and, for \"\", the zeta function, the Casimir energy, and the Casimir force are obtained. The obtained Casimir energy and force are exact up to order \"\"and \"\"respectively. In this scenario both energy and force are finite and do not need to be renormalized, and the force is found to produce an outward pressure on the spherical surface.
The dichotomy that faces nursing tutorial staff  [PDF]
Andrea M. Corbett
Open Journal of Nursing (OJN) , 2011, DOI: 10.4236/ojn.2011.11002
Abstract: There is a requirement for tutorial staff teaching on a degree programme to be engaged in research activity on a continuing basis. This is often in conflict with the demands that tutors in the Bachelor of Nursing programme are required to have academic ability and clinical skills whilst at the same time, engage in meaningful research activity. This does not occur. A study of the literature finds a commonality of this dichotomy throughout the world. A question is raised as to the impact of the increasing age of the nursing workforce; does this have an impact on the develop-ment of a research culture? It is suggested that the joint project approach adopted by the WITT (Western Institute of Technology at Taranaki) School of Nursing will assist in overcoming some of the identi-fied issues and begin the development of a research culture within the School that will be ongoing.
Financial Innovation, Macroeconomic Volatility and the Great Moderation  [PDF]
Lorenzo Bencivelli, Andrea Zaghini
Modern Economy (ME) , 2012, DOI: 10.4236/me.2012.35071
Abstract: In the paper we propose an assessment of the role of financial innovation in shaping US macroeconomic dynamics. We extend an existing model by Christiano, Eichenbaum and Evans which studied the transmission of monetary policy im- pulses to business and corporate sector financing variables just before the Great Moderation period. By investigating the properties of the model over a longer time span we show that in the later period a change in the monetary policy trans- mission mechanism is likely to have occurred. In particular, we argue that the role of financial innovation has signify- cantly altered the transmission of shocks.
Disclosure of Disability by University Students: Development of a Study Protocol  [PDF]
Andrea De Cesarei
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.28012
Abstract: Within the life course of a person with disability, higher education represents an important step, and the disclosure of a disability is one of the first and most important choices that the person with disability has to take. Based on a review of the literature, it is described how a research protocol for investigating the effects of Self Efficacy and Metacognition on the Disclosure of Disability by university students is developed. These data would provide information concerning the predictive effects of the metacognitive skills, social support and self-efficacy on the attitudes towards the disclosure of a disability.
The Serological Diagnosis of Canine Leishmaniasis: Commercial ELISA or in House IFAT?  [PDF]
Pasquale Santoro, Andrea Vellusi
Open Journal of Veterinary Medicine (OJVM) , 2015, DOI: 10.4236/ojvm.2015.52005
Abstract: The levels of anti-Leishmania infantum antibodies are relevant with the diagnosis and the followup of infected dogs. Both ELISA (Enzyme-Linked Immunosorbent Assay) and IFAT (Indirect Immuno-Fluorescent Antibody Test) may be employed to estimate the antibody levels in dogs, but at present, the correlation between ELISA absorbance and IFAT titer has not been investigated. In this paper, we compared the optical densities obtained with a commercial ELISA, Leiscan?(Laboratorios Dr. Esteve S.A.), versus the titers obtained by in house IFAT. We measured ELISA absorbance of: 44 IFAT negative samples coming from an endemic area; 10 negative samples coming from a non endemic area; 29 samples with an IFAT titer between 1/40 and 1/80; 10 samples with an IFAT titer of 1/160; 9 samples with an IFAT titer of 1/320; 10 samples with an IFAT titer of 1/640; 10 samples with an IFAT titer ≥ of 1/1280. Results show that: a) there is a poor correlation between IFAT titer and ELISA absorbance; b) Leiscan? is not able to distinguish between IFAT negative samples and IFAT titers up to 1:160; c) IFAT negative samples from an endemic or non endemic area show different ELISA absorbance; d) the performance of the kit may be improved by the use of a more appropriate cut-off.
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