Time-frequency methods for coherent spectroscopy

Time-frequency decomposition techniques, borrowed from the signal-processing field, have been adapted and applied to the analysis of 2D oscillating signals. While the Fourier-analysis techniques available so far are able to interpret the information content of the oscillating signal only in terms of its frequency components, the time-frequency transforms (TFT) proposed in this work can instead provide simultaneously frequency and time resolution, unveiling the dynamics of the relevant beating components, and supplying a valuable help in their interpretation. In order to fully exploit the potentiality of this method, several TFTs have been tested in the analysis of sample 2D data. Possible artifacts and sources of misinterpretation have been identified and discussed

Old and new approaches to marketing. The quest of their epistemological roots

In recent years the marketing discipline faced a considerable increase in the number of approaches. Some of the new "labels" are probably just new names advertised to sell old products. But some may contain significant new issues that need to be identified and discussed. Do these new marketing denominations (viral, retro, vintage, postmodern, judo, tribal, buzz, and many more) identify distinctions on subjects being studied, without particular methodological implications, or rather, do new labels and new subjects imply orientations that start from different epistemological premises and involve different research methodologies? This paper try to investigate if the proliferation of labels related to alleged new methods of marketing analysis actually implies a distinctions of subjects being studied and different epistemological premises.marketing trends, marketing epistemology

Branching Asymptotics on Manifolds with Edge

We study pseudo-differential operators on a wedge with continuous and variable discrete branching asymptotics.Comment: 54 pages, 1 figure

Product-line variety and innovation along product life-cycle in car market: are carmakers’ policies really effective?

This paper presents some preliminary results of a research concerning the evolution of product variety and product innovation policies of carmakers in the European market. Three market segments are taken into consideration for the period 1984-2004; data concerning model sales and product characteristics of some of the main carmakers are examined and the aspects taken into consideration refers to Product Life-Cycle (PLC), price positioning, rough measures of Product Line Width (PLW) and Product Line Innovation (PLI). The aim of the research is to describe product replacement policies and timing pursued by carmakers within each segment to evaluate the effectiveness of carmakers PLC policies through inter-brand comparison mainly based upon: a) PLC extent for each model, b) PLW variation along the life-cycle, c) PLI effectiveness. Differences in brands policies, as well as evolutionary trends of persistence or of discontinuity within the same brand are investigated, as well as the relation between PLC trend and timing in new model introduction.Car Industry, Product Policy, Car Marketing

In quest for a sustainable motorization: the CNG opportunity

This article aims at describing the opportunity deriving from the substitution of conventional fuels, as gasoline and diesel, with the Compressed Natural Gas (CNG), frequently indicated as methane. The use of CNG systems in vehicles cannot be considered the ultimate solution to the problem of pollution generated by road transport, but the advantages of this fuel are: a) relevant, as it concerns consumer’s expenses and ecological aspect; b) rapidly achievable, waiting for availability of new technologies capable of more relevant advantages; c) close to hand for several countries: Europe and U.S. and those where the motorization is at the take-off stage, like the BRIC countries (Brazil, Russia, India, China), and others like: Iran, Pakistan, Indonesia and so on. In fact, such countries in take-off stage on the one hand have extensive reserves of methane, and on the other hand need to cut emission urgently, specifically in areas with a high density of population. From the economic point of view CNG results a viable solution with few contraindication. The most important bottleneck is represented by a possible shortage in the distribution network. If a country is crossed by a gas pipeline this shortage could be overcome rapidly and without relevant costs. In the others the solution could be achieved either through gas carriers ships or through local production of biomethane by the exploitation of biomasses.Sustainable motorization, CNG, car industry, low emission cars

Global analysis of coherence and population dynamics in 2D electronic spectroscopy

2D electronic spectroscopy is a widely exploited tool to study excited state dynamics. A high density of information is enclosed in 2D spectra. A crucial challenge is to objectively disentangle all the features of the third order optical signal. We propose a global analysis method based on the variable projection algorithm, which is able to reproduce simultaneously coherence and population dynamics of rephasing and non-rephasing contributions. Test measures at room temperature on a standard dye are used to validate the procedure and to discuss the advantages of the proposed methodology with respect to the currently employed analysis procedures

Managing Information Flows in Supplier-Customer Relationships: Issues, Methods and Emerging Problems

IMVP, Working Pape

Prediction of segregation in funnel and mass flow discharge

In this paper we present a model to predict the onset and evolution of segregation during the discharge of binary mixtures of granular materials. The model accounts for the multi-phase and multi-component nature of the granular mixtures, to simulate the main flow regimes occurring in the discharge of silos (funnel and mass flow) and how they affect segregation. The new comprehensive model for segregation follows a continuum Eulerian approach and results from the coupling between an ad-hoc rheology for granular flow and a percolation model for multi-component mixtures. Predictions are compared with independent literature experimental data, for short and tall silos and prove to be quite accurate, after a tuning of the percolation flux sub-model. The larger segregation in short flow paths with smaller amount of fines reported by the experiments is quantitatively predicted. The model also predicts the three phases observed in experiments during the discharge of tall silos