1,720,959 research outputs found
Sviluppo di una piattaforma sperimentale per l’analisi dell’acqua mediante osservazione spaziale dello scattering
No full textIl presente lavoro descrive lo sviluppo di una piattaforma per l’analisi di sospensioni acquose e colloidi che sfrutta l’interazione delle particelle con la luce e osserva l’assorbimento e lo scattering. La piattaforma è stata realizzata nell’intento di poter avere un ambiente di analisi versatile, in modo da poter variare la lunghezza d’onda e intensità della sorgente luminosa e l’angolo di osservazione. Come sensore è stata utilizzata una telecamera CCD per poter sfruttare l’informazione spaziale utilizzando tecniche di image processing. In questo modo è possibile ottenere informazioni sulla concentrazione del campione acquoso e anche un indicazione sulla distribuzione delle dimensioni delle particelle
Physical AWGN channel emulator for Bit Error Rate Test of digital baseband communication
No full textThis paper presents a physical channel emulator solution for applications such as Bit Error Rate Testing of Error Correcting Codes. The solution relies on an analog White Gaussian Noise Generator coupled additively with an analog data signal to emulate the communication channel. This is interfaced to a computer through a USB connection, allowing the use of programs in different environments, such as Matlab and Labview. This solution can allow different types of channels to be emulated and with different noise sources. A software-based method to measure Signal to Noise Ratio and to characterize the channel is also presented. The system has been validated using a Matlab interface implementing multiple error correcting codes and showed good agreement with the theoretical model
Sviluppo di un metodo basato su Random Multi-Sine per l’analisi spettroscopica ad ultrasuoni di sistemi polidispersi
No full textIl presente lavoro descrive lo sviluppo di un metodo di misura per l'analisi spettroscopica di sistemi polidispersi basato sull'utilizzo di un segnale di test di tipo "Random Multi-Sine". Rispetto ad altre tecniche basate sull'utilizzo di burst sinusoidali o impulsi a larga banda, il metodo proposto consente di ottimizzare l’energia associata alle componenti spettrali del segnale di eccitazione e ridurre i tempi di misura garantendo un’elevata risoluzione in frequenza
Milk quality analysis based on a novel ultrasound spectroscopy method
No full textIn this paper, a promising technique for milk analysis based on an ultrasound spectroscopy is presented and tested. Particularly, it employ a wide-band random multi-sine as excitation signal to analyse the system responses aiming to obtain its transfer function. This signal assure a better utilization of the signal spectrum, compacting the energy in the frequency band of interest. An experimental setup has been developed to perform polydisperse system analysis with different ultrasonic techniques. Six different milk types were analysed, allowing to evaluate different fat, carbohydrate and protein concentrations. Results showed the transfer functions amplitude and phase variations for each type of milk studied
An Experimental Platform for the Analysis of Polydisperse Systems Based on Light Scattering and Image Processing
Get PDFIn this work an experimental platform for light scattering analysis has been developed using image sensors, as CCD or CMOS. The main aim of this activity is the investigation of the feasibility of using these types of sensors for polydisperse systems analysis. The second purpose is the implementation of an experimental platform which is enough versatile to permit the observation of different phenomena in order to develop novel sensors/approach using data fusion
Sistemi di assistenza alla navigazione e alla manovra per piccole imbarcazioni in spazi portuali ristretti: stato dell’arte
No full textIl presente lavoro analizza lo stato dell'arte per quanto riguarda i sensori impiegabili per la realizzazione di sistemi di assistenza alla guida per imbarcazioni da diporto di piccole e medie dimension
La caratterizzazione di sistemi polidispersi mediante spettroscopia acustica: stato dell'arte
No full textIl presente lavoro analizza i vantaggi offerti dalla spettroscopia ad ultrasuoni per l'analisi si sistemi polidispersi. Vengono descritti i principali metodi di misura e viene presentato lo sviluppo di un setup sperimentale
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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