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Search Results: 1 - 10 of 14436 matches for " Andrea; Battaglia "
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Biological monitoring of asphalt workers by urinary 1-hydroxypyrene: comparison between outdoor and indoor paving
Battaglia Andrea,Battaglia Alberto
Prevention and Research : International Open Access Journal of Prevention and Research in Medicine , 2012, DOI: 10.7362/2240-2594.020.2012
Abstract: Introduction: This study investigates urinary excretion of 1-hydroxypyrene (1-OHP) in 108 asphalt workers, who carried out daily activities adhering scrupulously to the preventive and protective policies laid down by "Regione Lombardia". Objectives: We want to evaluate the sensitivity of the assay of urinary hydroxypyrene as a descriptor of exposure to polycyclic aromatic hydrocarbons and evaluate the contribution of smoking on urinary 1-OHP. Methods: Values found after two days of asphalt working and values after two days of inactivity were compared. Readings were also compared between smokers and non-smokers, and between outdoor and indoor paving. Results: Differences of urinary 1-OHP values measured in the same workers after 2 days of inactivity, and values after two days spent in asphalting were not statistically significant, while a significant association between the two readings emerged in case of indoor asphalting. No significant differences between smokers and non-smokers were found. Conclusions: Urinary 1-OHP is a biomarker that better correlates with exposure to fumes of bitumen, but only when exposure is high, as it happens during indoor asphalting; in cases of low exposure, increase in the urinary excretion of the marker can not be statistically significant. Cigarette smoking, known for interfering with this indicator of exposure, could limit specificity, but did not significantly contribute in tests done in absence of occupational exposure.
A Moser-Trudinger inequality for the singular Toda system
Luca Battaglia,Andrea Malchiodi
Mathematics , 2013,
Abstract: In this paper we prove a sharp version of the Moser-Trudinger inequality for the Euler-Lagrange functional of a singular Toda system, motivated by the study of models in Chern-Simons theory. Our result extends those for the scalar case, as well as for the regular Toda system. We expect this inequality to be a basic tool to attack variationally the existence problem under general assumptions.
Existence and non-existence results for the SU(3) singular Toda system on compact surfaces
Luca Battaglia,Andrea Malchiodi
Mathematics , 2015,
Abstract: We consider the SU(3) Toda system on a compact surface. We give both existence and non-existence results under some conditions on the parameters. Existence results are obtained using variational methods, which involve a geometric inequality of new type; non-existence results are obtained using blow-up analysis and localized Pohozaev identities.
The Strong Maximum Principle and the Harnack inequality for a class of hypoelliptic divergence-form operators
Erika Battaglia,Stefano Biagi,Andrea Bonfiglioli
Mathematics , 2014,
Abstract: In this paper we consider a class of hypoelliptic second-order partial differential operators $\mathcal{L}$ in divergence form on $\mathbb{R}^N$, arising from CR geometry and Lie group theory, and we prove the Strong and Weak Maximum Principles and the Harnack Inequality for $\mathcal{L}$. The involved operators are not assumed to belong to the H\"ormander hypoellipticity class, nor to satisfy subelliptic estimates, nor Muckenhoupt-type estimates on the degeneracy of the second order part; indeed our results hold true in the infinitely-degenerate case and for operators which are not necessarily sums of squares. We use a Control Theory result on hypoellipticity in order to recover a meaningful geometric information on connectivity and maxima propagation, yet in the absence of any H\"ormander condition. For operators $\mathcal{L}$ with $C^\omega$ coefficients, this control-theoretic result will also imply a Unique Continuation property for the $\mathcal{L}$-harmonic functions. The (Strong) Harnack Inequality is obtained via the Weak Harnack Inequality by means of a Potential Theory argument, and by a crucial use of the Strong Maximum Principle and the solvability of the Dirichlet problem for $\mathcal{L}$ on a basis of the Euclidean topology.
Workplace conflicts and psychological work-related injuries: our experience in Italy
Giuseppe Taino, Andrea Battaglia, Marcello Imbriani
Journal of Health and Social Sciences , 3, DOI: 10.19204/2016/wrkp3
Abstract: In Europe, all countries regularly recognise mental disorders as workplace accidents (mainly post-traumatic stress disorders). However, there has been little emphasis on this emerging issue in Italy. Our discussion focuses on a recent case report regarding an employee who was affected by an acute anxiety disorder after a common workplace conflict with a coworker. Given that prolonged and unresolved relationship conflicts may result in more extreme forms of conflict known as workplace bullying, relationship conflicts should be minimised or prevented as early as possible. These conflicts can also lead to acute stress disorders, particularly in workers who are at-risk for stress disorders. To prevent psychological work-related injuries, occupational stakeholders should use assessments for work-related stress as a framework for addressing all organisational risk factors that are related to workplace relationships and conflict.
A general existence result for the Toda system on compact surfaces
Luca Battaglia,Aleks Jevnikar,Andrea Malchiodi,David Ruiz
Mathematics , 2013,
Abstract: In this paper we consider the Toda system of equations on a compact surface, which is motivated by the study of models in non-abelian Chern-Simons theory. We prove a general existence result using variational methods. The same analysis applies to a mean field equation which arises in fluid dynamics.
Observations of Embryonic Changes in Middle and Late Stages of the Greater Wax Moth, Galleria mellonella (Lepidoptera: Pyralidae)  [PDF]
Muhamad Abidalla, Donatella Battaglia
Advances in Entomology (AE) , 2018, DOI: 10.4236/ae.2018.63015
Abstract: The embryogenesis of lepidopteran insects has morphogenetic events accompanying the blastokinesis movements (anatrepsis and katatrepsis) in early and late stages, respectively. Katatrepsis is related to embryonic movement with yolk mass and regression of amnioserosa folds in the second half of the development cycle. The whole mount method and differential interference contrast microscopy (DIC) were used for analysing the embryonic developmental changes. Those changes in the middle and late embryonic periods were described and divided into eight stages: 1) Completion of segmentation and differentiation of cephalic and thoracic appendages (32 - 40 hours post-oviposition h. PO); 2) Expanded growth of cephalo-gnathal and abdominal parts (41 - 60 h. PO); 3) Completion of thoracic appendages and appearance of pleuropodia, katatrepsis (60 - 70 h. PO); 4) Pre-revolution morphogenetic movement of the cephalo-gnathal region (71 - 80 h. PO); 5) revolution of the embryo (81 - 100 h. PO); 6) Beginning of dorsal closure (101 - 115 h. PO); 7) completion of dorsal closure (116 - 120 h. PO); and 8) full-grown embryo just before hatching (121 - 144 h. PO).
Efficacy of an enterovaccine in recurrent episodes of diarrhea in the dog: a pilot study
Cerquetella,Matteo; Laus,Fulvio; Speranzini,Fabiana; Carnevali,Cristina; Spaterna,Andrea; Battaglia,Edda; Bassotti,Gabrio;
Revista Espa?ola de Enfermedades Digestivas , 2012, DOI: 10.4321/S1130-01082012000200004
Abstract: recurrent episodes of self-limiting diarrhea in the dog, due to sudden dietary changes and to stressful or exciting situations, are conditions sometimes difficult to treat. colifagina?, a commercially available bacterial enterovaccine, showed, in previous studies performed on experimentally induced colitis in mice, to be able to improve both disease activity index and histological appearance, increase colonic secretion of iga, and reduce inflammatory chemokine secretion. in the present study colifagina? was administered to five dogs presenting recurrent episodes of self-limiting diarrhea and to one dog presenting chronic diarrhea. during the follow-up period, almost all patients decreased the number of episodes of abnormal defecation and the fecal score of such episodes improved in five out of six dogs. even if further studies are needed to understand the exact potential of the compound, in dogs presenting recurrent episodes of self-limiting diarrhea due to sudden dietary changes and/or stressing or exciting situations, colifagina? seems to be helpful in managing most of these patients.
Single microparticles mass measurement using an AFM cantilever resonator
Marco Mauro,Raffaele Battaglia,Gianluca Ferrini,Roberto Puglisi,Donatella Balduzzi,Andrea Galli
Physics , 2014,
Abstract: In this work is presented a microbalance for single microparticle sensing based on resonating AFM cantilever. The variation of the resonator eigenfrequency is related to the particle mass positioned at the free apex of the cantilever. An all-digital phase locked loop (PLL) control system is developed to detect the variations in cantilever eigenfrequency. Two particle populations of different materials are used in the experimental test, demonstrating a mass sensitivity of 15 Hz/pg in ambient conditions. Thereby it is validated the possibility of developing an inexpensive, portable and sensitive microbalance for point-mass sensing.
Joint RANS/LES Modeling of Flameless Combustion  [PDF]
Vladimir L. Zimont, Valerio Battaglia
Energy and Power Engineering (EPE) , 2011, DOI: 10.4236/epe.2011.35077
Abstract: We present our timesaving joint RANS/LES approach (we originally developed it for numerical simulations of turbulent premixed combustion) to simulate flameless combustion with separate injection of gas fuel and strong exhaust gas recirculation. It is based on successive RANS/LES numerical modeling where part of the information (stationary average fields) is achieved by RANS simulations and part (instantaneous nonstationary image of the process) by LES. The latter is performed using the RANS field of mean dissipation rate to model the sub-grid turbulent viscosity in the context of the Kolmogorov theory of small-scale turbulence. We analyze flameless combustion in the FLOX® combustor where we also simulate non-premixed flame combustion used for preliminary heating of the combustor. Different regimes take place using different systems of air injection. We applied for both regimes the simple assumption of “mixed is burnt”. The main results are the following: 1) RANS simulations demonstrate for used two injection systems respectively more compact flame and distributed flameless combustion. 2)There is agreement between RANS and corresponding LES results: RANS and averaged LES profiles of the velocity and temperature are in reasonable agreement. 3) LES modeling with Kolmogorov independent on time sub-grid viscosity reproduce instantaneous image of the process including the vortex structures. Probably due to using an annular injector system for air the instantaneous field of the temperature demonstrate significant irregularity in the beginning of the burner, which in an animation looks like moving coherent structures. 4) In the joint RANS/LES approach the computer time of the LES sub-problems is much shorter than classic LES modeling due to using time independent subgrid transport coefficients and avoiding long-continued simulations, which are necessary for averaging of instantaneous LES fields. Practically in our simulations time consuming of the LES sub-problem was only several times lager then the RANS one and it makes this approach suitable for industrial applications.
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