On asymptotic effects of boundary perturbations in exponentially shaped Josephson junctions

A parabolic integro differential operator L, suitable to describe many phenomena in various physical fields, is considered. By means of equivalence between L and the third order equation describing the evolution inside an exponentially shaped Josephson junction (ESJJ), an asymptotic analysis for (ESJJ) is achieved, explicitly evaluating, boundary contributions related to the Dirichlet problem

Firm-oriented policies, tax cheating and perverse outcomes

This paper examines the implications of firm-oriented fiscal policies, namely investment subsidies and tax allowances, in an economy where producers may potentially avoid taxes. Among our results we stress the following. First, although investment subsidies induce increased capital accumulation (a level effect), they promote tax evasion; these subsidies induce firms to increase actual capital accumulation (a level effect), but also produce a reduction in the share of aggregate capital stock deployed in taxed, "official" production (a composition effect). Second, parameters characterizing the tax enforcement system play a major role in explaining tax evasion and firm size. Third, the technology structure matters for determining how to allocate resources between official and unofficial production.State aid, tax exemptions, investment subsidies, tax evasion, unofficial underground production, investment

State Aid Policies and Underground Activities

The main goal of this paper is to examine the implications of firm-oriented fiscal policies, such as capital subsidies and tax allowances, in an economy with an underground sector. In addition, we investigate whether the technology structure of “hidden” production may facilitate or counteract the effects of fiscal policies on firm behavior. Among our results we stress the following: first, capital subsidies promote tax evasion; these subsidies induce firms to increase actual capital accumulation (a level effect), but also produce a reduction in the regular share of aggregate capital stock (a composition effect). Second, tax relief reduces underground activities and fosters capital accumulation, as well as aggregate production. Third, the technology structure matters for determining how to allocate resources between formal and informal production, hence the amount of reported revenues.State aid, tax exemptions, capital subsidies, tax evasion, underground production, physical capital accumulation.

Capital Subsidies and Underground Production

In this paper we investigate the effects of different fiscal policies on the firm choice to produce underground. We consider a tax evading firm operating simultaneously both in the regular and in the underground economy. We suggest that such a kind of firm, referred to as moonlighting firm, is able to offset the specific costs usually stressed by literature on underground production, such as those suggested by Loayza (1994) and Anderberg et alii (2003). Investigating the effects of different fiscal policy interventions, we find that taxation is a critical parameter to define the size of capital allocation in the underground production. In fact, a strong and inverse relationship is found, and tax reduction is the best policy to reduce the convenience to produce underground. We also confirm the depressing effect on investment of taxation (see, for instance, Summers, 1981), so that tax reduction has no cost in terms of investment. By contrast, the model states that while enforcement is an effective tool to reduce capital allocation in the underground production, it also reduce the total capital stock. Moreover, we also suggest that the allowance of incentives to capital accumulation may generate, in this specific typology of firm, some unexpected effects, causing, together with a positive investment process, also an increase in the share of irregularity. This finding could explain, in a microeconomic framework, the evidence of Italian southern regions, where high incentives are combined with high irregularity ratios.tax evasion, moonlighting, capital subsidies, underground production

Diffusion and wave behaviour in linear Voigt model

A boundary value problem related to a third- order parabolic equation with a small parameter is analized. This equation models the one-dimensional evolution of many dissipative media as viscoelastic fluids or solids, viscous gases, superconducting materials, incompressible and electrically conducting fluids. Moreover, the third-order parabolic operator regularizes various non linear second order wave equations. In this paper, the hyperbolic and parabolic behaviour of the solution is estimated by means of slow time and fast time. As consequence, a rigorous asymptotic approximation for the solution is established

Tackling Inequalities in Oral Health: Bone Augmentation in Dental Surgery through the 3D Printing of Poly(ε-caprolactone) Combined with 20% Tricalcium Phosphate

Personalized medicine and overcoming healthcare inequalities have gained significant popularity in recent years. Polymers offer an ideal solution due to their cost-effectiveness, ease of customized 3D printing, and potential for wide-scale expansion. Poly- mers blended with β-tricalcium phosphate (TCP) have been found to synergize with the environ- mental tissues of maxillary bones and promote osteoconductivity. However, little is known about their properties after printing and their ability to maintain their biological role; additionally, limi- tations exist in 3D printing when high TPC concentrations are added. Our study demonstrated that poly ε-caprolactone (PCL)+β-TCP 20% composite can be successfully printed and is a suitable ma- terial for commercial 3D printing. The material also demonstrated biocompatibility, supporting osteoblast adhesion and promoting cell proliferation and differentiation. The composite can also sustain ISO14937:200935 sterilization procedures, which makes it an ideal material for printing medical devices that can be used by clinicians worldwide

Analisi di settore: le acque

Indice: Definizione del settore - Il caso Italia - Il caso del Regno Unito - Il caso francese - Il caso tedesco - Altri paesi europei - Sistemi di tariffazion