ON THE REGULARITY OF SINGULAR INTEGRAL OPERATORS ON COMPLEX DOMAINS

Given a doman $\Omega$ in $C^n$, it is a classical problem to study the boundary behavior of functions which are holomorphic on $\Omega$. The boundary values of a given function are often expressed by means of singular integral operators. In this thesis we study this problem in two different settings with different motivations. In the first part we deal with a non-smooth version of the so-called worm domain in order to understand the role played by the pathological geometry of this domain. In the second part we study the problem in the case of a product Lipschitz surface and some boundedness results for biparameter singular integral operators are proved

Diffusion Enhanced Upconversion in Organic Systems

The upconverted fluorescence generation in a solution of multicomponent organic systems has been studied as a function of the temperature to investigate the role of resonant energy transfer processes and of the molecular diffusion on the overall emission yield. The strong blue emission observed exciting the samples at 532 nm derives from a bimolecular triplet-triplet annihilation between 9,10 diphenylanthracene molecules, which produces singlet excited states from which the higher energy emission takes place. Diphenylanthracene excited triplet states are populated by energy transfer from a phosphorescent donor (Pt(II)octaethylporphyrin) which acts as excitation light harvesting. At low temperature, the experimental data on the efficiency of the transfer have been interpreted in the frame of a Dexter energy transfer in the Perrin approximation. At room temperature, the fast diffusion of the molecules has been found to be the main factor which affects the energy transfer rates and the overall photon upconversion efficiency

On Hardy spaces on worm domains

In this review article we present the problem of studying Hardy spaces and the related Szego projection on worm domains. We review the importance of the Diederich-Fornaess worm domain as a smooth bounded pseudoconvex domain whose Bergman projection does not preserve Sobolev spaces of sufficiently high order and we highlight which difficulties arise in studying the same problem for the Szego projection. Finally, we announce and discuss the results we have obtained so far in the setting of non-smooth worm domains

Le emissioni in atmosfera dalle combustioni in Lombardia

Il lavoro presenta le stime delle emissioni in atmosfera di polveri fini, precursori di polveri fini e gas serra in Lombardia provenienti dalle attività di combustione di combustibili e carburanti, come stimate dall’inventario regionale INEMAR per l’anno 2003. I dati dei consumi elaborati nell’inventario derivano da informazioni raccolte sia mediante questionari relativi alle principali sorgenti puntuali della regione, sia consultando le diverse fonti statistiche. Le emissioni in atmosfera sono stimate sia attraverso dati derivanti da misure effettuate presso gli impianti che tramite fattori di emissione proposti in letteratura e utilizzati in ambito EMEP-Corinair e IPCC (Intergovernmental Panel on Climate Change). La combustione nel settore del trasporto stradale risulta essere la principale sorgente per numerosi inquinanti, fra cui PM10, NOx, SO2 e CO. L’olio combustibile utilizzato per la produzione di energia è la maggiore fonte di SO2 (56% delle emissioni totali regionali), mentre il gasolio per autotrazione fornisce il principale contributo alle emissioni di NOx (44% del totale). Per le emissioni di polveri (sia PM10 che PM2,5), oltre ai determinanti contributi della combustione del gasolio per autotrazione e della legna in ambito domestico, sono rilevanti anche i processi di usura nel traffico stradale (pneumatici, freni, abrasione dell’asfalto) e le attività relative al settore agro-zootecnico. La benzina è la principale fonte di CO (50%), mentre il metano costituisce una sorgente di grande importanza (45%) per la CO2 e di interesse anche per gli ossidi di azoto (21% del totale regionale). Il lavoro fornisce altresì una valutazione dei fattori di emissione medi dalle attività di combustione in Lombardia a diverse scale di dettaglio

One Dimensional Polymeric Organic Photonic Crystals for DFB Lasers

We present a very simple method to realize a one-dimensional photonic crystal (1D PC), consisting of a dye-doped polymeric multilayer. Due to the high photonic density of states at the edges of the photonic band-gap (PBG), a surface emitting distributed feedback (DFB) laser is obtained with this structure. Furthermore, the incidence angle dependence of the PBG of the polymeric multilayer is reported

Is Parkinson's disease an unique clinical entity? Rigid or tremor dominant PD: Two faces of the same coin

Parkinson's disease is one of the most described neurodegenerative pathologies; though it is one of the most complex pathologies, is not fully understood, correctly identified, with its different types of presentation, its clinical course and the neural networks involved. We report on a series consisting of 432 de novo PD diagnosed patients, and 457 control cases. We identify a possible independent relationship between two clinical PD presentation, akinetic-rigid and tremor-dominant, and cognitive and behavioral changes. A 24-months follow-up allows to identify new information still not fully explored

Oxidative stress as a biomarker for monitoring treated celiac disease article

Introduction: High levels of reactive oxygen species (ROS) and impaired antioxidant defense systems lead to oxidative stress (OxS) and tissue injury in different intestinal and extra intestinal conditions, including celiac disease (CD). The aim of the present study was to investigate the role and potential use of ROS and other biomarkers of OxS in the clinical management of CD. Methods: We collected duodenal specimens and blood samples from na\uefve patients (N-CD), patients on a gluten free diet (GFD) including responders (CD-GFD) and non-responders (NRCD). We measured plasmatic ROS production (electron paramagnetic resonance, EPR), lipid peroxidation (thiobarbituric acid-reactive substances, TBARS), protein oxidation (protein carbonyl, PC), total antioxidant capacity (TAC), nitric oxides and glutathione (GSH) in erythrocytes. Results: Fifty-four patients affected by CD were enrolled (17 N-CD, 18 CD-GFD and 19 NRCD; 44 F; age 44 \ub1 13 years). A significant increase of plasmatic OxS biomarkers (ROS, peroxidated lipids, oxidized proteins, and nitrate concentrations) and decrease of antioxidant species (TAC and GSH levels) were found in NRCD and N-CD compared to CD-GFD. Comparably, a significant direct relationship between the severity of duodenal atrophy, ROS production rates and TBARS was found; conversely, TAC and GSH presented an inverse correlation. Discussion: OxS is involved in CD tissue damage and correlates with the degree of duodenal atrophy. These findings suggest the possible role of OxS biomarkers as indicators of CD activity during the clinical follow-up