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Search Results: 1 - 10 of 208928 matches for " L. Marini "
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Geochemical modeling of magmatic gas scrubbing
L. Marini,B. Gambardella
Annals of Geophysics , 2005, DOI: 10.4401/ag-3230
Abstract: The EQ3/6 software package, version 7.2 was successfully used to model scrubbing of magmatic gas by pure water at 0.1 MPa, in the liquid and liquid-plus-gas regions. Some post-calculations were necessary to account for gas separation effects. In these post-calculations, redox potential was considered to be fixed by precipitation of crystalline a-sulfur, a ubiquitous and precocious process. As geochemical modeling is constrained by conservation of enthalpy upon water-gas mixing, the enthalpies of the gas species of interest were reviewed, adopting as reference state the liquid phase at the triple point. Our results confirm that significant emissions of highly acidic gas species (SO2(g), HCl(g), and HF(g)) are prevented by scrubbing, until dry conditions are established, at least locally. Nevertheless important outgassing of HCl(g) can take place from acid, HCl-rich brines. Moreover, these findings support the rule of thumb which is generally used to distinguish SO2-, HCl-, and HF-bearing magmatic gases from SO2-, HCl-, and HF-free hydrothermal gases.
Preparation of Star-Shaped Polylactic Acid Drug Carrier Nanoparticles  [PDF]
Michele Marini
Materials Sciences and Applications (MSA) , 2010, DOI: 10.4236/msa.2010.11007
Abstract: Drug carrier biocompatible and biodegradable nanoparticles of about 15 nm were prepared by solvent evaporation technique from star-shaped poly(D,L-lactide) synthesized using dipentaerythritol as core and Tin (II) ethylhexanoate as catalyst.
The Importance of Health Records  [PDF]
Milena Marini
Health (Health) , 2015, DOI: 10.4236/health.2015.75073
Abstract: Health records have played an increasingly important role throughout history as an important legal document for the exercise of individuals’ rights. However, domestic legislation fails to define health records as a legally important collection of health data and documents. Recording facts and storing legally important documents are therefore the tasks of the operator. Using the prescriptive method we will determine which laws are governing the management of medical records, their safety and accessibility. Based on the descriptive method, we will describe the process of handling health records by the provider of health treatment, focusing on exposed regulatory gaps in the area of the protection of the rights of an individual. Through the analysis of the laws governing the management of health records, even after death and operator terminating the service, we will carry out inductive reasoning and provide conclusions regarding the attitude towards health records. Considering different results we can conclude that health information, especially documents relevant to the protection of individual’s rights, is not transparent. Above all, the documents in the collection are not recorded properly, thus allowing for their removal. Even the transfer of health records by the provider of health treatment is not defined, which could result in the disposal of the entire health documentation.
Positive solutions for singular discrete boundary value problems
Mariella Cecchi,Zuzana Do lá,Mauro Marini
Abstract and Applied Analysis , 2004, DOI: 10.1155/s1085337504306068
Abstract: We study the existence of zero-convergent solutions for thesecond-order nonlinear difference equation Δ(anΦp(Δxn))=g(n,xn
On the Growth of Nonoscillatory Solutions for Difference Equations with Deviating Argument
M. Cecchi,Z. Do?lá,M. Marini
Advances in Difference Equations , 2008, DOI: 10.1155/2008/505324
Abstract: The half-linear difference equations with the deviating argument ”(an| ”xn| ±sgn ¢ € ‰ ”xn)+bn|xn+q| ±sgn ¢ € ‰xn+q=0 , q ¢ € ‰ ¢ ¢ € ‰ ¢ ¤ are considered. We study the role of the deviating argument q, especially as regards the growth of the nonoscillatory solutions and the oscillation. Moreover, the problem of the existence of the intermediate solutions is completely resolved for the classical half-linear equation (q = 1). Some analogies or discrepancies on the growth of the nonoscillatory solutions for the delayed and advanced equations are presented; and the coexistence with different types of nonoscillatory solutions is studied.
Nonoscillatory half-linear difference equations and recessive solutions
Cecchi Mariella,Do?lá Zuzana,Marini Mauro
Advances in Difference Equations , 2005,
Abstract: Recessive and dominant solutions for the nonoscillatory half-linear difference equation are investigated. By using a uniqueness result for the zero-convergent solutions satisfying a suitable final condition, we prove that recessive solutions are the "smallest solutions in a neighborhood of infinity," like in the linear case. Other asymptotic properties of recessive and dominant solutions are treated too.
On the Growth of Nonoscillatory Solutions for Difference Equations with Deviating Argument
Cecchi M,Do?lá Z,Marini M
Advances in Difference Equations , 2008,
Abstract: The half-linear difference equations with the deviating argument , are considered. We study the role of the deviating argument , especially as regards the growth of the nonoscillatory solutions and the oscillation. Moreover, the problem of the existence of the intermediate solutions is completely resolved for the classical half-linear equation ( = 1). Some analogies or discrepancies on the growth of the nonoscillatory solutions for the delayed and advanced equations are presented; and the coexistence with different types of nonoscillatory solutions is studied.
Nonoscillatory half-linear difference equations and recessive solutions
Mariella Cecchi,Zuzana Do?lá,Mauro Marini
Advances in Difference Equations , 2005, DOI: 10.1155/ade.2005.193
Abstract: Recessive and dominant solutions for the nonoscillatory half-linear difference equation are investigated. By using a uniqueness result for the zero-convergent solutions satisfying a suitable final condition, we prove that recessive solutions are the ¢ € smallest solutions in a neighborhood of infinity, ¢ € like in the linear case. Other asymptotic properties of recessive and dominant solutions are treated too.
On Second-Order Differential Equations with Nonhomogeneous -Laplacian
Cecchi Mariella,Do?lá Zuzana,Marini Mauro
Boundary Value Problems , 2010,
Abstract: Equation with general nonhomogeneous -Laplacian, including classical and singular -Laplacian, is investigated. Necessary and sufficient conditions for the existence of nonoscillatory solutions satisfying certain asymptotic boundary conditions are given and discrepancies between the general and classical are illustrated as well.
The Damping of Energetic Gluons and Quarks in High-Temperature QCD
C. P. Burgess,A. L. Marini
Physics , 1991, DOI: 10.1103/PhysRevD.45.17
Abstract: When a gluon or a quark is sent through the hot QCD plasma it can be absorbed into the ambient heat bath and so can acquire an effective lifetime. At high temperatures and for weak couplings the inverse lifetime, or damping rate, for energetic quarks and transverse gluons, (those whose momenta satisfy $|\p| \gg gT$) is given by $\gamma(\p) = c\; g^2 \log\left({1\over g}\right)\; T + O(g^2T)$. We show that very simple arguments suffice both to fix the numerical coefficient, $c$, in this expression and to show that the $O(g^2T)$ contribution is incalculable in perturbation theory without further assumptions. For QCD with $N_c$ colours we find (expressed in terms of the casimir invariants $C_a=N_c$ and $C_f=(N_c^2-1)/(2N_c)$): $c_g=+{C_a\over 4\pi}$ for gluons and $c_q=+{C_f\over 4\pi}$ for quarks. These numbers agree with the more detailed calculations of Pisarski \etal\ but disagree with those of Lebedev and Smilga. The simplicity of the calculation also permits a direct verification of the gauge-invariance and physical sign of the result.
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