Simultaneous optical signal-to-noise ratio and differential group delay monitoring based on degree of polarization measurements in optical communications systems

We present a simultaneous optical signal-to-noise ratio (OSNR) and differential group delay (DGD) monitoring method based on degree of polarization (DOP) measurements in optical communications systems. For the first time in the literature (to our best knowledge), the proposed scheme is demonstrated to be able to independently and simultaneously extract OSNR and DGD values from the DOP measurements. This is possible because the OSNR is related to maximum DOP, while DGD is related to the ratio between the maximum and minimum values of DOP. We experimentally measured OSNR and DGD in the ranges from 10 to 30 dB and 0 to 90 ps for a 10 Gb/s non-return-to-zero signal. A theoretical analysis of DOP accuracy needed to measure low values of DGD and high OSNRs is carried out, showing that current polarimeter technology is capable of yielding an OSNR measurement within 1 dB accuracy, for OSNR values up to 34 dB, while DGD error is limited to 1.5% for DGD values above 10 ps. For the first time to our knowledge, the technique was demonstrated to accurately measure first-order polarization mode dispersion (PMD) in the presence of a high value of second-order PMD (as high as 2071 ps(2)). (C) 2012 Optical Society of America

Functional Magnetic Resonance Imaging Data Analysis by Autoregressive Estimator

The autoregressive (AR) estimator, a non-parametric method, is used to analyze functional magnetic resonance imaging (fMRI) data. The same method has been used, with success, in several other time series data analysis. It uses exclusively the available experimental data points to estimate the most plausible power spectra compatible with the experimental data and there is no need to make any assumption about non-measured points. The time series, obtained from fMRI block paradigm data, is analyzed by the AR method to determine the brain active regions involved in the processing of a given stimulus. This method is considerably more reliable than the fast Fourier transform or the parametric methods. The time series corresponding to each image pixel is analyzed using the AR estimator and the corresponding poles are obtained. The pole distribution gives the shape of power spectra, and the pixels with poles at the stimulation frequency are considered as the active regions. The method was applied in simulated and real data, its superiority is shown by the receiver operating characteristic curves which were obtained using the simulated data.

Solar-Terrestrial Signal Record in Tree Ring Width Time Series from Brazil

This work investigates the behavior of the sunspot number and Southern Oscillation Index (SOI) signal recorded in the tree ring time series for three different locations in Brazil: Humaita in Amaznia State, Porto Ferreira in So Paulo State, and Passo Fundo in Rio Grande do Sul State, using wavelet and cross-wavelet analysis techniques. The wavelet spectra of tree ring time series showed signs of 11 and 22 years, possibly related to the solar activity, and periods of 2-8 years, possibly related to El Nio events. The cross-wavelet spectra for all tree ring time series from Brazil present a significant response to the 11-year solar cycle in the time interval between 1921 to after 1981. These tree ring time series still have a response to the second harmonic of the solar cycle (5.5 years), but in different time intervals. The cross-wavelet maps also showed that the relationship between the SOI x tree ring time series is more intense, for oscillation in the range of 4-8 years.

Analysis of nonlinear dynamics of vocal folds using high-speed video observation and biomechanical modeling

Primary voice production occurs in the larynx through vibrational movements carried out by vocal folds. However, many problems can affect this complex system resulting in voice disorders. In this context, time-frequency-shape analysis based on embedding phase space plots and nonlinear dynamics methods have been used to evaluate the vocal fold dynamics during phonation. For this purpose, the present work used high-speed video to record the vocal fold movements of three subjects and extract the glottal area time series using an image segmentation algorithm. This signal is used for an optimization method which combines genetic algorithms and a quasi-Newton method to optimize the parameters of a biomechanical model of vocal folds based on lumped elements (masses, springs and dampers). After optimization, this model is capable of simulating the dynamics of recorded vocal folds and their glottal pulse. Bifurcation diagrams and phase space analysis were used to evaluate the behavior of this deterministic system in different circumstances. The results showed that this methodology can be used to extract some physiological parameters of vocal folds and reproduce some complex behaviors of these structures contributing to the scientific and clinical evaluation of voice production. (C) 2010 Elsevier Inc. All rights reserved.

Transcriptional profiling of Saccharomyces cerevisiae exposed to propolis

Abstract Background Propolis is a natural product of plant resins collected by honeybees (Apis mellifera) from various plant sources. Our previous studies indicated that propolis sensitivity is dependent on the mitochondrial function and that vacuolar acidification and autophagy are important for yeast cell death caused by propolis. Here, we extended our understanding of propolis-mediated cell death in the yeast Saccharomyces cerevisiae by applying systems biology tools to analyze the transcriptional profiling of cells exposed to propolis. Methods We have used transcriptional profiling of S. cerevisiae exposed to propolis. We validated our findings by using real-time PCR of selected genes. Systems biology tools (physical protein-protein interaction [PPPI] network) were applied to analyse the propolis-induced transcriptional bevavior, aiming to identify which pathways are modulated by propolis in S. cerevisiae and potentially influencing cell death. Results We were able to observe 1,339 genes modulated in at least one time point when compared to the reference time (propolis untreated samples) (t-test, p-value 0.01). Enrichment analysis performed by Gene Ontology (GO) Term finder tool showed enrichment for several biological categories among the genes up-regulated in the microarray hybridization such as transport and transmembrane transport and response to stress. Real-time RT-PCR analysis of selected genes showed by our microarray hybridization approach was capable of providing information about S. cerevisiae gene expression modulation with a considerably high level of confidence. Finally, a physical protein-protein (PPPI) network design and global topological analysis stressed the importance of these pathways in response of S. cerevisiae to propolis and were correlated with the transcriptional data obtained thorough the microarray analysis. Conclusions In summary, our data indicate that propolis is largely affecting several pathways in the eukaryotic cell. However, the most prominent pathways are related to oxidative stress, mitochondrial electron transport chain, vacuolar acidification, regulation of macroautophagy associated with protein target to vacuole, cellular response to starvation, and negative regulation of transcription from RNA polymerase II promoter. Our work emphasizes again the importance of S. cerevisiae as a model system to understand at molecular level the mechanism whereby propolis causes cell death in this organism at the concentration herein tested. Our study is the first one that investigates systematically by using functional genomics how propolis influences and modulates the mRNA abundance of an organism and may stimulate further work on the propolis-mediated cell death mechanisms in fungi.

Bootstrap confidence intervals for industrial recurrent event data

Industrial recurrent event data where an event of interest can be observed more than once in a single sample unit are presented in several areas, such as engineering, manufacturing and industrial reliability. Such type of data provide information about the number of events, time to their occurrence and also their costs. Nelson (1995) presents a methodology to obtain asymptotic confidence intervals for the cost and the number of cumulative recurrent events. Although this is a standard procedure, it can not perform well in some situations, in particular when the sample size available is small. In this context, computer-intensive methods such as bootstrap can be used to construct confidence intervals. In this paper, we propose a technique based on the bootstrap method to have interval estimates for the cost and the number of cumulative events. One of the advantages of the proposed methodology is the possibility for its application in several areas and its easy computational implementation. In addition, it can be a better alternative than asymptotic-based methods to calculate confidence intervals, according to some Monte Carlo simulations. An example from the engineering area illustrates the methodology.

Numerical Model for the Dynamic Analysis of Pile Foundations

Programa de doctorado: Sistemas Inteligentes y Aplicaciones Numéricas en Ingeniería Instituto Universitario (SIANI)

Sviluppo di metodologie di localizzazione nel contesto del Comprehensive Nuclear Test-Ban Treaty

Since the first underground nuclear explosion, carried out in 1958, the analysis of seismic signals generated by these sources has allowed seismologists to refine the travel times of seismic waves through the Earth and to verify the accuracy of the location algorithms (the ground truth for these sources was often known). Long international negotiates have been devoted to limit the proliferation and testing of nuclear weapons. In particular the Treaty for the comprehensive nuclear test ban (CTBT), was opened to signatures in 1996, though, even if it has been signed by 178 States, has not yet entered into force, The Treaty underlines the fundamental role of the seismological observations to verify its compliance, by detecting and locating seismic events, and identifying the nature of their sources. A precise definition of the hypocentral parameters represents the first step to discriminate whether a given seismic event is natural or not. In case that a specific event is retained suspicious by the majority of the State Parties, the Treaty contains provisions for conducting an on-site inspection (OSI) in the area surrounding the epicenter of the event, located through the International Monitoring System (IMS) of the CTBT Organization. An OSI is supposed to include the use of passive seismic techniques in the area of the suspected clandestine underground nuclear test. In fact, high quality seismological systems are thought to be capable to detect and locate very weak aftershocks triggered by underground nuclear explosions in the first days or weeks following the test. This PhD thesis deals with the development of two different seismic location techniques: the first one, known as the double difference joint hypocenter determination (DDJHD) technique, is aimed at locating closely spaced events at a global scale. The locations obtained by this method are characterized by a high relative accuracy, although the absolute location of the whole cluster remains uncertain. We eliminate this problem introducing a priori information: the known location of a selected event. The second technique concerns the reliable estimates of back azimuth and apparent velocity of seismic waves from local events of very low magnitude recorded by a trypartite array at a very local scale. For the two above-mentioned techniques, we have used the crosscorrelation technique among digital waveforms in order to minimize the errors linked with incorrect phase picking. The cross-correlation method relies on the similarity between waveforms of a pair of events at the same station, at the global scale, and on the similarity between waveforms of the same event at two different sensors of the try-partite array, at the local scale. After preliminary tests on the reliability of our location techniques based on simulations, we have applied both methodologies to real seismic events. The DDJHD technique has been applied to a seismic sequence occurred in the Turkey-Iran border region, using the data recorded by the IMS. At the beginning, the algorithm was applied to the differences among the original arrival times of the P phases, so the cross-correlation was not used. We have obtained that the relevant geometrical spreading, noticeable in the standard locations (namely the locations produced by the analysts of the International Data Center (IDC) of the CTBT Organization, assumed as our reference), has been considerably reduced by the application of our technique. This is what we expected, since the methodology has been applied to a sequence of events for which we can suppose a real closeness among the hypocenters, belonging to the same seismic structure. Our results point out the main advantage of this methodology: the systematic errors affecting the arrival times have been removed or at least reduced. The introduction of the cross-correlation has not brought evident improvements to our results: the two sets of locations (without and with the application of the cross-correlation technique) are very similar to each other. This can be commented saying that the use of the crosscorrelation has not substantially improved the precision of the manual pickings. Probably the pickings reported by the IDC are good enough to make the random picking error less important than the systematic error on travel times. As a further justification for the scarce quality of the results given by the cross-correlation, it should be remarked that the events included in our data set don’t have generally a good signal to noise ratio (SNR): the selected sequence is composed of weak events ( magnitude 4 or smaller) and the signals are strongly attenuated because of the large distance between the stations and the hypocentral area. In the local scale, in addition to the cross-correlation, we have performed a signal interpolation in order to improve the time resolution. The algorithm so developed has been applied to the data collected during an experiment carried out in Israel between 1998 and 1999. The results pointed out the following relevant conclusions: a) it is necessary to correlate waveform segments corresponding to the same seismic phases; b) it is not essential to select the exact first arrivals; and c) relevant information can be also obtained from the maximum amplitude wavelet of the waveforms (particularly in bad SNR conditions). Another remarkable point of our procedure is that its application doesn’t demand a long time to process the data, and therefore the user can immediately check the results. During a field survey, such feature will make possible a quasi real-time check allowing the immediate optimization of the array geometry, if so suggested by the results at an early stage.

BEM-FEM coupling model for the dynamic analysis of piles and pile groups

[EN] This paper shows a BEM-FEM coupling model for the time harmonic dynamic analysis of piles and pile groups embeddes in an elastic half-space. Piles are modelled using Finite Elements (FEM) as a beam according to the Bernoulli hypothesis, while the soil modelled using  Boundary Elements (BEM) as a continuum, semi-infinite, isotropic, homogeneous or zoned homogeneous, linear, viscoelastic medium.

Relazione gestante-feto, modalità del parto e sviluppo fisico del bambino

Extensive literature outlined that the quality of the mother-foetus relationship is considered the main feature with regard to the quality of postnatal mother-infant interaction and also to the child’s psychical development. Nowadays the relationship between the pregnant woman and her foetus is viewed as the central factor of the somatic dialogue between the functioning of the maternal and the foetal organisms. This dialogue is responsible for the physic development of the child, as well as of its psychosomatic structure. Therefore the research area has necessarily had to extend to the analysis of psychological processes concerning: the pregnancy, the couple that is bound by parenthood, the influence of intergenerational dynamics. In fact, the formation of maternal identity, as well as that of the relationship between the woman and the foetus, refers to the pregnant woman’s relationship with her parents, especially with her mother. The same pregnancy, considered as a psychosomatic event, is directly influenced by relational, affective and social factors, particularly by the quality of the interiorized parental relations and the quality of the current relationships (such as that with her partner and with her family of origin). Some studies have begun to investigate the relationship between the pregnant woman and the foetus in term of “prenatal attachment” and its relationship with socio-demographic, psychological e psychopathological aspects (such as pre and post partum depression), but the research area is still largely unexplored. The present longitudinal research aimed to investigate the quality of the pregnant womanfoetus relationship by the prenatal attachment index, the quality of the interiorized relationship with woman’s parents, the level of alexithymic features and maternity social support, in relation with the modulation of the physiology of delivery and of postpartum, as well as of the physical development of the child. A consecutive sample of 62 Italian primipara women without any kind of pathologies, participated in the longitudinal study. In the first phase of this study (third trimester of the pregnancy), it has investigated the psychological processes connected to the affective investment of the pregnant women towards the unborn baby (by Prenatal Attachment Inventory), the mothers’ interiorized relationship with their own parents (by Parental Bonding Instrument), the social and affective support from their partner and their family of origin are able to supply (by Maternity Social Support Scale), and the level of alexithymia (by 20-Toronto Alexithymia Scale). In the second phase of this study, some data concerning the childbirth course carried out from a “deliverygram” (such as labour, induction durations and modalities of delivery) and data relative to the newborns state of well-being (such as Apgar and pH indexes). Finally, in the third phase of the study women have been telephoned a month after the childbirth. The semistructured interview investigated the following areas: the memory concerning the delivery, the return to home, the first interactions between the mother and the newborn, the breastfeeding, the biological rhythms achieved from newborns. From the data analysis a sample with a good level of prenatal attachment and of support social and a good capability to mental functioning emerged. An interesting result is that the most of the women have a great percentage of “affectionless control style” with both parents, but data is not sufficient to interpret this result. Moreover, considering the data relative to the delivery, medical and welfare procedures, that have been necessary, are coherent with the Italian mean, while the percentage of the caesarean section (12.9%) is inferior to the national percentage (30%). The 29% of vaginal partum has got epidural analgesia, which explains the high number (37%) of obstetrician operations (such as Kristeller). The data relative to the newborn (22 male, 40 female) indicates a good state of well-being because Apgar and pH indexes are superior to 7 at first and fifth minutes. Concerning the prenatal phase, correlation analysis showed that: the prenatal attachment scores positively correlated with the expected social support and negatively correlated with the “externally oriented thinking” dimension of alexithymia; the maternity social support negatively correlated with total alexithymia score, particularly with the “externally oriented thinking” dimension, and negatively correlated with maternal control of parental bonding. Concerning the delivery data, there are many correlations (after all obvious) among themselves. The most important are that the labour duration negatively correlated with the newborn’s index state of well-being. Finally, concerning the data from the postpartum phase the women’ assessments relative to the partum negatively correlated with the duration of the delivery and positively correlated with the assessment relative to the return to home and the interaction with the newborn. Moreover the length of permanence in the hospital negatively correlated with women’s assessments relative to the return to home that, in turn, positively correlated with the quality of breastfeeding, the interaction between the mother and the newborn and the biological regulation of the child. Finally, the women’ assessments relative to breastfeeding positively correlated with the mother-child interactions and the biological rhythms of children. From the correlation analysis between the variables of the prenatal phase and the data relative to the delivery, emerged that the prenatal attachment scores positively correlated with the dilatation stage scores and with the newborn’s Apgar index at first minute, the paternal care dimension of parental bonding positively correlated with the lengths of the various periods of childbirth like so the paternal control dimension with placental stage. Moreover, emerged that the expected social support positively correlated with the lengths of the various periods of childbirth and that the global alexithymia scores, particularly “difficulty to describe emotions” dimension, negatively correlated with total childbirth scores. From the correlation analysis between the variables of the prenatal phase and variable of the postpartum phase emerged that the total alexithymia scores positively correlated with the time elapsed from the childbirth to the breastfeeding of the child, the difficulty to describe emotions dimension of the alexithymia negatively correlated with the quality of the breastfeeding, the “externally oriented thinking” dimension of the alexithymia negatively correlated with mother-child interactions, and finally the paternal control dimension of the parental bonding negatively correlated with the time elapsed from the child to the breastfeeding of the child. Finally, from the analysis of the correlation between the data of the partum and the women’s assessments of the postpartum phase, emerged the negative correlation between the woman’s assessment relative to the delivery and the quantitative of obstetrician operations and the lengths of the various periods of childbirth, the positive correlation between the women’s assessment about the length of delivery periods and the real lengths of the same ones, the positive relation between woman’s assessment relative to the delivery and the Apgar index of children. In conclusion, there is a remarkable relation between the quality of the relationship the woman establishes with the foetus that influences the course of the pregnancy and the delivery that, in turn, influences the postpartum outcome, particularly relative to the mother-children relationship. Such data should be confirmed by heterogeneous populations in order to identify vulnerable women and to project focused intervention.

L'eredità di Aldo Rossi nella Penisola Iberica. La costruzione della città e il progetto contemporaneo

Descrizione, tema e obiettivi della ricerca La ricerca si propone lo studio delle possibili influenze che la teoria di Aldo Rossi ha avuto sulla pratica progettuale nella Penisola Iberica, intende quindi affrontare i caratteri fondamentali della teoria che sta alla base di un metodo progettuale ed in particolar modo porre l'attenzione alle nuove costruzioni quando queste si confrontano con le città storiche. Ha come oggetto principale lo studio dei documenti, saggi e scritti riguardanti il tema della costruzione all'interno delle città storiche. Dallo studio di testi selezionati di Aldo Rossi sulla città si vuole concentrare l'attenzione sull'influenza che tale teoria ha avuto nei progetti della Penisola Iberica, studiare come è stata recepita e trasmessa successivamente, attraverso gli scritti di autori spagnoli e come ha visto un suo concretizzarsi poi nei progetti di nuove costruzioni all'interno delle città storiche. Si intende restringere il campo su un periodo ed un luogo precisi, Spagna e Portogallo a partire dagli anni Settanta, tramite la lettura di un importante evento che ha ufficializzato il contatto dell'architetto italiano con la Penisola Iberica, quale il Seminario di Santiago de Compostela tenutosi nel 1976. Al Seminario parteciparono numerosi architetti che si confrontarono su di un progetto per la città di Santiago e furono invitati personaggi di fama internazionale a tenere lezioni introduttive sul tema di dibattito in merito al progetto e alla città storica. Il Seminario di Santiago si colloca in un periodo storico cruciale per la Penisola Iberica, nel 1974 cade il regime salazarista in Portogallo e nel 1975 cade il regime franchista in Spagna ed è quindi di rilevante importanza capire il legame tra l'architettura e la nuova situazione politica. Dallo studio degli interventi, dei progetti che furono prodotti durante il Seminario, della relazione tra questo evento ed il periodo storico in cui esso va contestualizzato, si intende giungere alla individuazione delle tracce della reale presenza di tale eredità. Presupposti metodologici. Percorso e strumenti di ricerca La ricerca può quindi essere articolata in distinte fasi corrispondenti per lo più ai capitoli in cui si articola la tesi: una prima fase con carattere prevalentemente storica, di ricerca del materiale per poter definire il contesto in cui si sviluppano poi le vicende oggetto della tesi; una seconda fase di impronta teorica, ossia di ricerca bibliografica del materiale e delle testimonianze che provvedono alla definizione della reale presenza di effetti scaturiti dai contatti tra Rossi e la Penisola Iberica, per andare a costruire una eredità ; una terza fase che entra nel merito della composizione attraverso lo studio e la verifica delle prime due parti, tramite l'analisi grafica applicata ad uno specifico esempio architettonico selezionato; una quarta fase dove il punto di vista viene ribaltato e si indaga l'influenza dei luoghi visitati e dei contatti intrattenuti con alcuni personaggi della Penisola Iberica sull'architettura di Rossi, ricercandone i riferimenti. La ricerca è stata condotta attraverso lo studio di alcuni eventi selezionati nel corso degli anni che si sono mostrati significativi per l'indagine, per la risonanza che hanno avuto sulla storia dell'architettura della Penisola. A questo scopo si sono utilizzati principalmente tre strumenti: lo studio dei documenti, le pubblicazioni e le riviste prodotte in Spagna, gli scritti di Aldo Rossi in merito, e la testimonianza diretta attraverso interviste di personaggi chiave. La ricerca ha prodotto un testo suddiviso per capitoli che rispetta l'organizzazione in fasi di lavoro. A seguito di determinate condizioni storiche e politiche, studiate nella ricerca a supporto della tesi espressa, nella Penisola Iberica si è verificato il diffondersi della necessità e del desiderio di guardare e prendere a riferimento l'architettura europea e in particolar modo quella italiana. Il periodo sul quale viene focalizzata l'attenzione ha inizio negli anni Sessanta, gli ultimi prima della caduta delle dittature, scenario dei primi viaggi di Aldo Rossi nella Penisola Iberica. Questi primi contatti pongono le basi per intense e significative relazioni future. Attraverso l'approfondimento e la studio dei materiali relativi all'oggetto della tesi, si è cercato di mettere in luce il contesto culturale, l'attenzione e l'interesse per l'apertura di un dibattito intorno all'architettura, non solo a livello nazionale, ma europeo. Ciò ha evidenziato il desiderio di innescare un meccanismo di discussione e scambio di idee, facendo leva sull'importanza dello sviluppo e ricerca di una base teorica comune che rende coerente i lavori prodotti nel panorama architettonico iberico, seppur ottenendo risultati che si differenziano gli uni dagli altri. E' emerso un forte interesse per il discorso teorico sull'architettura, trasmissibile e comunicabile, che diventa punto di partenza per un metodo progettuale. Ciò ha reso palese una condivisione di intenti e l'assunzione della teoria di Aldo Rossi, acquisita, diffusa e discussa, attraverso la pubblicazione dei suoi saggi, la conoscenza diretta con l'architetto e la sua architettura, conferenze, seminari, come base teorica su cui fondare il proprio sapere architettonico ed il processo metodologico progettuale da applicare di volta in volta negli interventi concreti. Si è giunti così alla definizione di determinati eventi che hanno permesso di entrare nel profondo della questione e di sondare la relazione tra Rossi e la Penisola Iberica, il materiale fornito dallo studio di tali episodi, quali il I SIAC, la diffusione della rivista "2C. Construccion de la Ciudad", la Coleccion Arquitectura y Critica di Gustavo Gili, hanno poi dato impulso per il reperimento di una rete di ulteriori riferimenti. E' stato possibile quindi individuare un gruppo di architetti spagnoli, che si identificano come allievi del maestro Rossi, impegnato per altro in quegli anni nella formazione di una Scuola e di un insegnamento, che non viene recepito tanto nelle forme, piuttosto nei contenuti. I punti su cui si fondano le connessioni tra l'analisi urbana e il progetto architettonico si centrano attorno due temi di base che riprendono la teoria esposta da Rossi nel saggio L'architettura della città : - relazione tra l'area-studio e la città nella sua globalità, - relazione tra la tipologia edificatoria e gli aspetti morfologici. La ricerca presentata ha visto nelle sue successive fasi di approfondimento, come si è detto, lo sviluppo parallelo di più tematiche. Nell'affrontare ciascuna fase è stato necessario, di volta in volta, operare una verifica delle tappe percorse precedentemente, per mantenere costante il filo del discorso col lavoro svolto e ritrovare, durante lo svolgimento stesso della ricerca, gli elementi di connessione tra i diversi episodi analizzati. Tale operazione ha messo in luce talvolta nodi della ricerca rimasti in sospeso che richiedevano un ulteriore approfondimento o talvolta solo una rivisitazione per renderne possibile un più proficuo collegamento con la rete di informazioni accumulate. La ricerca ha percorso strade diverse che corrono parallele, per quanto riguarda il periodo preso in analisi: - i testi sulla storia dell'architettura spagnola e la situazione contestuale agli anni Settanta - il materiale riguardante il I SIAC - le interviste ai partecipanti al I SIAC - le traduzioni di Gustavo Gili nella Coleccion Arquitectura y Critica - la rivista "2C. Construccion de la Ciudad" Esse hanno portato alla luce una notevole quantità di tematiche, attraverso le quali, queste strade vengono ad intrecciarsi e a coincidere, verificando l'una la veridicità dell'altra e rafforzandone il valore delle affermazioni. Esposizione sintetica dei principali contenuti esposti dalla ricerca Andiamo ora a vedere brevemente i contenuti dei singoli capitoli. Nel primo capitolo Anni Settanta. Periodo di transizione per la Penisola Iberica si è cercato di dare un contesto storico agli eventi studiati successivamente, andando ad evidenziare gli elementi chiave che permettono di rintracciare la presenza della predisposizione ad un cambiamento culturale. La fase di passaggio da una condizione di chiusura rispetto alle contaminazioni provenienti dall'esterno, che caratterizza Spagna e Portogallo negli anni Sessanta, lascia il posto ad un graduale abbandono della situazione di isolamento venutasi a creare intorno al Paese a causa del regime dittatoriale, fino a giungere all'apertura e all'interesse nei confronti degli apporti culturali esterni. E' in questo contesto che si gettano le basi per la realizzazione del I Seminario Internazionale di Architettura Contemporanea a Santiago de Compostela, del 1976, diretto da Aldo Rossi e organizzato da César Portela e Salvador Tarragó, di cui tratta il capitolo secondo. Questo è uno degli eventi rintracciati nella storia delle relazioni tra Rossi e la Penisola Iberica, attraverso il quale è stato possibile constatare la presenza di uno scambio culturale e l'importazione in Spagna delle teorie di Aldo Rossi. Organizzato all'indomani della caduta del franchismo, ne conserva una reminescenza formale. Il capitolo è organizzato in tre parti, la prima si occupa della ricostruzione dei momenti salienti del Seminario Proyecto y ciudad historica, dagli interventi di architetti di fama internazionale, quali lo stesso Aldo Rossi, Carlo Aymonino, James Stirling, Oswald Mathias Ungers e molti altri, che si confrontano sul tema delle città storiche, alle giornate seminariali dedicate all’elaborazione di un progetto per cinque aree individuate all’interno di Santiago de Compostela e quindi dell’applicazione alla pratica progettuale dell’inscindibile base teorica esposta. Segue la seconda parte dello stesso capitolo riguardante La selezione di interviste ai partecipanti al Seminario. Esso contiene la raccolta dei colloqui avuti con alcuni dei personaggi che presero parte al Seminario e attraverso le loro parole si è cercato di approfondire la materia, in particolar modo andando ad evidenziare l’ambiente culturale in cui nacque l’idea del Seminario, il ruolo avuto nella diffusione della teoria di Aldo Rossi in Spagna e la ripercussione che ebbe nella pratica costruttiva. Le diverse interviste, seppur rivolte a persone che oggi vivono in contesti distanti e che in seguito a questa esperienza collettiva hanno intrapreso strade diverse, hanno fatto emergere aspetti comuni, tale unanimità ha dato ancor più importanza al valore di testimonianza offerta. L’elemento che risulta più evidente è il lascito teorico, di molto prevalente rispetto a quello progettuale che si è andato mescolando di volta in volta con la tradizione e l’esperienza dei cosiddetti allievi di Aldo Rossi. Negli stessi anni comincia a farsi strada l’importanza del confronto e del dibattito circa i temi architettonici e nel capitolo La fortuna critica della teoria di Aldo Rossi nella Penisola Iberica è stato affrontato proprio questo rinnovato interesse per la teoria che in quegli anni si stava diffondendo. Si è portato avanti lo studio delle pubblicazioni di Gustavo Gili nella Coleccion Arquitectura y Critica che, a partire dalla fine degli anni Sessanta, pubblica e traduce in lingua spagnola i più importanti saggi di architettura, tra i quali La arquitectura de la ciudad di Aldo Rossi, nel 1971, e Comlejidad y contradiccion en arquitectura di Robert Venturi nel 1972. Entrambi fondamentali per il modo di affrontare determinate tematiche di cui sempre più in quegli anni si stava interessando la cultura architettonica iberica, diventando così ¬ testi di riferimento anche nelle scuole. Le tracce dell’influenza di Rossi sulla Penisola Iberica si sono poi ricercate nella rivista “2C. Construccion de la Ciudad” individuata come strumento di espressione di una teoria condivisa. Con la nascita nel 1972 a Barcellona di questa rivista viene portato avanti l’impegno di promuovere la Tendenza, facendo riferimento all’opera e alle idee di Rossi ed altri architetti europei, mirando inoltre al recupero di un ruolo privilegiato dell’architettura catalana. A questo proposito sono emersi due fondamentali aspetti che hanno legittimato l’indagine e lo studio di questa fonte: - la diffusione della cultura architettonica, il controllo ideologico e di informazione operato dal lavoro compiuto dalla rivista; - la documentazione circa i criteri di scelta della redazione a proposito del materiale pubblicato. E’ infatti attraverso le pubblicazioni di “2C. Construccion de la Ciudad” che è stato possibile il ritrovamento delle notizie sulla mostra Arquitectura y razionalismo. Aldo Rossi + 21 arquitectos españoles, che accomuna in un’unica esposizione le opere del maestro e di ventuno giovani allievi che hanno recepito e condiviso la teoria espressa ne “L’architettura della città”. Tale mostra viene poi riproposta nella Sezione Internazionale di Architettura della XV Triennale di Milano, la quale dedica un Padiglione col titolo Barcelona, tres epocas tres propuestas. Dalla disamina dei progetti presentati è emerso un interessante caso di confronto tra le Viviendas para gitanos di César Portela e la Casa Bay di Borgo Ticino di Aldo Rossi, di cui si è occupato l’ultimo paragrafo di questo capitolo. Nel corso degli studi è poi emerso un interessante risvolto della ricerca che, capovolgendone l’oggetto stesso, ne ha approfondito gli aspetti cercando di scavare più in profondità nell’analisi della reciproca influenza tra la cultura iberica e Aldo Rossi, questa parte, sviscerata nell’ultimo capitolo, La Penisola Iberica nel “magazzino della memoria” di Aldo Rossi, ha preso il posto di quello che inizialmente doveva presentarsi come il risvolto progettuale della tesi. Era previsto infatti, al termine dello studio dell’influenza di Aldo Rossi sulla Penisola Iberica, un capitolo che concentrava l’attenzione sulla produzione progettuale. A seguito dell’emergere di un’influenza di carattere prettamente teorica, che ha sicuramente modificato la pratica dal punto di vista delle scelte architettoniche, senza però rendersi esplicita dal punto di vista formale, si è preferito, anche per la difficoltà di individuare un solo esempio rappresentativo di quanto espresso, sostituire quest’ultima parte con lo studio dell’altra faccia della medaglia, ossia l’importanza che a sua volta ha avuto la cultura iberica nella formazione della collezione dei riferimenti di Aldo Rossi. L’articolarsi della tesi in fasi distinte, strettamente connesse tra loro da un filo conduttore, ha reso necessari successivi aggiustamenti nel percorso intrapreso, dettati dall’emergere durante la ricerca di nuovi elementi di indagine. Si è pertanto resa esplicita la ricercata eredità di Aldo Rossi, configurandosi però prevalentemente come un’influenza teorica che ha preso le sfumature del contesto e dell’esperienza personale di chi se ne è fatto ricevente, diventandone così un continuatore attraverso il proprio percorso autonomo o collettivo intrapreso in seguito. Come suggerisce José Charters Monteiro, l’eredità di Rossi può essere letta attraverso tre aspetti su cui si basa la sua lezione: la biografia, la teoria dell’architettura, l’opera. In particolar modo per quanto riguarda la Penisola Iberica si può parlare dell’individuazione di un insegnamento riferito alla seconda categoria, i suoi libri di testo, le sue partecipazioni, le traduzioni. Questo è un lascito che rende possibile la continuazione di un dibattito in merito ai temi della teoria dell’architettura, della sue finalità e delle concrete applicazioni nelle opere, che ha permesso il verificarsi di una apertura mentale che mette in relazione l’architettura con altre discipline umanistiche e scientifiche, dalla politica, alla sociologia, comprendendo l’arte, le città la morfologia, la topografia, mediate e messe in relazione proprio attraverso l’architettura.

Spatio-temporal variation of macrofaunal assemblages in the deep Blanes submarine canyon

The spatio-temporal variations in diversity and abundance of deep-sea macrofaunal assemblages (excluding meiofaunal taxa, as Nematoda, Copepoda and Ostracoda) from the Blanes Canyon (BC) and adjacent open slope are described. The Catalan Sea basin is characterized by the presence of numerous submarine canyons, which are globally acknowledged as biodiversity hot-spots, due to their disturbance regime and incremented conveying of organic matter. This area is subjected to local deep-sea fisheries activities, and to recurrent cold water cascading events from the shelf. The upper canyon (~900 m), middle slope (~1200 m) and lower slope (~1500 m) habitats were investigated during three different months (October 2008, May 2009 and September 2009). A total of 624 specimens belonging to 16 different taxa were found into 67 analyzed samples, which had been collected from the two study areas. Of these, Polychaeta, Mollusca and Crustacea were always the most abundant groups. As expected, the patterns of species diversity and evenness were different in time and space. Both in BC and open slope, taxa diversity and abundance are higher in the shallowest depth and lowest at -1500 m depth. This is probably due to different trophic regimes at these depths. The abundance of filter-feeders is higher inside BC than in the adjacent open slope, which is also related with an increment of predator polychaetes. Surface deposit-feeders are more abundant in the open slope than in BC, along with a decrement of filter-feeders and their predators. Probably these differences are due to higher quantities of suspended organic matter reaching the canyon. The multivariate analyses conducted on major taxa point out major differences effective taxa richness between depths and stations. In September 2009 the analyzed communities double their abundances, with a corresponding increase in richness of taxa. This could be related to a mobilizing event, like the release of accumulated food-supply in a nepheloid layer associated to the arrival of autumn. The highest abundance in BC is detected in the shallowest depth and in late summer (September), probably due to higher food availability caused by stronger flood events coming from Tordera River. The effects of such events seemed to involve adjacent open slope too. The nMDS conducted on major taxa abundance shows a slight temporal difference between the three campaigns samples, with a clear clustering between samples of Sept 09. All depth and all months were dominated by Polychaeta, which have been identified to family level and submitted to further analysis. Family richness have clearly minimum at the -1200 m depth of BC, highlighting the presence of a general impact affecting the populations in the middle slope. Three different matrices have been created, each with a different taxonomic level (All Taxa “AT”, Phylum Level “PL” and Polychaeta Families “PF”). Multivariate analysis (MDS, SIMPER) conducted on PL matrix showed a clear spatial differences between stations (BC and open slope) and depths. MDSs conducted on other two matrices (AT and PF) showed similar patterns, but different from PL analysis. A 2 nd stage analysis have been conducted to understand differences between different taxonomic levels, and PL level has been chosen as the most representative of variation. The faunal differences observed were explained by depth, station and season. All work has been accomplished in the Centre d’estudis avançats de Blanes (CEAB-CSIC), within the framework of Spanish PROMETEO project "Estudio Integrado de Cañones y Taludes PROfundos del MEdiTErráneo Occidental: un hábitat esencial", Ref. CTM2007-66316-C02- 01/MAR.

Analisi della dinamica e composizione chimica del particolato atmosferico mediante un modello alla mesoscala

The vertical profile of aerosol in the planetary boundary layer of the Milan urban area is studied in terms of its development and chemical composition in a high-resolution modelling framework. The period of study spans a week in summer of 2007 (12-18 July), when continuous LIDAR measurements and a limited set of balloon profiles were collected in the frame of the ASI/QUITSAT project. LIDAR observations show a diurnal development of an aerosol plume that lifts early morning surface emissions to the top of the boundary layer, reaching maximum concentration around midday. Mountain breeze from Alps clean the bottom of the aerosol layer, typically leaving a residual layer at around 1500-2000 m which may survive for several days. During the last two days under analysis, a dust layer transported from Sahara reaches the upper layers of Milan area and affects the aerosol vertical distribution in the boundary layer. Simulation from the MM5/CHIMERE modelling system, carried out at 1 km horizontal resolution, qualitatively reproduced the general features of the Milan aerosol layer observed with LIDAR, including the rise and fall of the aersol plume, the residual layer in altitude and the Saharan dust event. The simulation highlighted the importance of nitrates and secondary organics in its composition. Several sensitivity tests showed that main driving factors leading to the dominance of nitrates in the plume are temperature and gas absorption process. A modelling study turn to the analysis of the vertical aerosol profiles distribution and knowledge of the characterization of the PM at a site near the city of Milan is performed using a model system composed by a meteorological model MM5 (V3-6), the mesoscale model from PSU/NCAR and a Chemical Transport Model (CTM) CHIMERE to simulate the vertical aerosol profile. LiDAR continuous observations and balloon profiles collected during two intensive campaigns in summer 2007 and in winter 2008 in the frame of the ASI/QUITSAT project have been used to perform comparisons in order to evaluate the ability of the aerosol chemistry transport model CHIMERE to simulate the aerosols dynamics and compositions in this area. The comparisons of model aerosols with measurements are carried out over a full time period between 12 July 2007 and 18 July 2007. The comparisons demonstrate the ability of the model to reproduce correctly the aerosol vertical distributions and their temporal variability. As detected by the LiDAR, the model during the period considered, predicts a diurnal development of a plume during the morning and a clearing during the afternoon, typically the plume reaches the top of the boundary layer around mid day, in this time CHIMERE produces highest concentrations in the upper levels as detected by LiDAR. The model, moreover can reproduce LiDAR observes enhancement aerosols concentrations above the boundary layer, attributing the phenomena to dust out intrusion. Another important information from the model analysis regard the composition , it predicts that a large part of the plume is composed by nitrate, in particular during 13 and 16 July 2007 , pointing to the model tendency to overestimates the nitrous component in the particular matter vertical structure . Sensitivity study carried out in this work show that there are a combination of different factor which determine the major nitrous composition of the “plume” observed and in particular humidity temperature and the absorption phenomena are the mainly candidate to explain the principal difference in composition simulated in the period object of this study , in particular , the CHIMERE model seems to be mostly sensitive to the absorption process.

Statistical analysis and simulation techniques in wall-bounded turbulence

The present work is devoted to the assessment of the energy fluxes physics in the space of scales and physical space of wall-turbulent flows. The generalized Kolmogorov equation will be applied to DNS data of a turbulent channel flow in order to describe the energy fluxes paths from production to dissipation in the augmented space of wall-turbulent flows. This multidimensional description will be shown to be crucial to understand the formation and sustainment of the turbulent fluctuations fed by the energy fluxes coming from the near-wall production region. An unexpected behavior of the energy fluxes comes out from this analysis consisting of spiral-like paths in the combined physical/scale space where the controversial reverse energy cascade plays a central role. The observed behavior conflicts with the classical notion of the Richardson/Kolmogorov energy cascade and may have strong repercussions on both theoretical and modeling approaches to wall-turbulence. To this aim a new relation stating the leading physical processes governing the energy transfer in wall-turbulence is suggested and shown able to capture most of the rich dynamics of the shear dominated region of the flow. Two dynamical processes are identified as driving mechanisms for the fluxes, one in the near wall region and a second one further away from the wall. The former, stronger one is related to the dynamics involved in the near-wall turbulence regeneration cycle. The second suggests an outer self-sustaining mechanism which is asymptotically expected to take place in the log-layer and could explain the debated mixed inner/outer scaling of the near-wall statistics. The same approach is applied for the first time to a filtered velocity field. A generalized Kolmogorov equation specialized for filtered velocity field is derived and discussed. The results will show what effects the subgrid scales have on the resolved motion in both physical and scale space, singling out the prominent role of the filter length compared to the cross-over scale between production dominated scales and inertial range, lc, and the reverse energy cascade region lb. The systematic characterization of the resolved and subgrid physics as function of the filter scale and of the wall-distance will be shown instrumental for a correct use of LES models in the simulation of wall turbulent flows. Taking inspiration from the new relation for the energy transfer in wall turbulence, a new class of LES models will be also proposed. Finally, the generalized Kolmogorov equation specialized for filtered velocity fields will be shown to be an helpful statistical tool for the assessment of LES models and for the development of new ones. As example, some classical purely dissipative eddy viscosity models are analyzed via an a priori procedure.

The abuse of intellectual property rights and regulations in China: a law and economic analysis

From the institutional point of view, the legal system of IPR (intellectual property right, hereafter, IPR) is one of incentive institutions of innovation and it plays very important role in the development of economy. According to the law, the owner of the IPR enjoy a kind of exclusive right to use his IP(intellectual property, hereafter, IP), in other words, he enjoys a kind of legal monopoly position in the market. How to well protect the IPR and at the same time to regulate the abuse of IPR is very interested topic in this knowledge-orientated market and it is the basic research question in this dissertation. In this paper, by way of comparing study and by way of law and economic analyses, and based on the Austrian Economics School’s theories, the writer claims that there is no any contradiction between the IPR and competition law. However, in this new economy (high-technology industries), there is really probability of the owner of IPR to abuse his dominant position. And with the characteristics of the new economy, such as, the high rates of innovation, “instant scalability”, network externality and lock-in effects, the IPR “will vest the dominant undertakings with the power not just to monopolize the market but to shift such power from one market to another, to create strong barriers to enter and, in so doing, granting the perpetuation of such dominance for quite a long time.”1 Therefore, in order to keep the order of market, to vitalize the competition and innovation, and to benefit the customer, in EU and US, it is common ways to apply the competition law to regulate the IPR abuse. In Austrian Economic School perspective, especially the Schumpeterian theories, the innovation/competition/monopoly and entrepreneurship are inter-correlated, therefore, we should apply the dynamic antitrust model based on the AES theories to analysis the relationship between the IPR and competition law. China is still a developing country with relative not so high ability of innovation. Therefore, at present, to protect the IPR and to make good use of the incentive mechanism of IPR legal system is the first important task for Chinese government to do. However, according to the investigation reports,2 based on their IPR advantage and capital advantage, some multinational companies really obtained the dominant or monopoly market position in some aspects of some industries, and there are some IPR abuses conducted by such multinational companies. And then, the Chinese government should be paying close attention to regulate any IPR abuse. However, how to effectively regulate the IPR abuse by way of competition law in Chinese situation, from the law and economic theories’ perspective, from the legislation perspective, and from the judicial practice perspective, there is a long way for China to go!