CONSUMER BEHAVIOUR IN COLLABORATIVE CONSUMPTION: An empirical study regarding motivations and experiences in car sharing.

This thesis tackles the issue of consumer behaviour within the collaborative economy. The aim of this study is to both clearly define the new collaborative economic phenomenon and depict consumer behaviour within this new trend especially regarding car-sharing service. Collaborative economy appears in many marketplaces over the past few years. It is no longer a niche and it embeds a wide range of users’ motivations. Therefore Scholars have struggled with defining collaborative economy. Likewise, is tough to define consumer behaviour within this economy. As a matter of fact, consumer behaviour embodies many realities, since different marketplaces, wherein collaborative service occurred, appeal various motivations. Firstly, the theoretical part of this study precisely defines concepts tied to collaborative economy. Secondly, the thesis introduces the notions of consumer behaviour, experience and confidence within the collaborative economy lens. Thirdly, interactions between these terms are compared with empirical findings. Data are collected through 5 semi-structural interviews. Respondents consist of car-sharing users. More precisely, the studies focused on BlaBlaCar platform’s use in 5 different countries. Findings show that word-of –mouths, price and convenience are decisive when it comes to starting using car-sharing service. Comments and experiences keep users using car-sharing services since they increase the users’ level of confidence. Eventually, this study speculates culture has an impact on car-sharing use.fi=Opinnäytetyö kokotekstinä PDF-muodossa.|en=Thesis fulltext in PDF format.|sv=Lärdomsprov tillgängligt som fulltext i PDF-format

Une plateforme pour l'analyse de matériaux par faisceaux d'ions à ARRONAX : Etude de l'effet d'humidité sur les échantillons

International audienceQuantification of soil pollution with method based on X-ray detection like X-Ray Fluorescence(XRF) suffers of multiple bias (moisture, surface state) especially when it's used for insituanalysis using portable-XRF. In order to study the effect of moisture on the results of ananalysis performed using X-Ray, we have performed studies using high energy PIXE/PIGE atthe ARRONAX. Samples were made of sand of different type. High energy PIXE/PIGE allowsus to avoid bias from surface state and to focus on moisture effect. It also allows to assessthe chemical composition of the sample. Results show a different behavior for each elementpresent in volcanic sand.</p

GENESIS: Co-location of Geodetic Techniques in Space

Improving and homogenizing time and space reference systems on Earth and, more directly, realizing the Terrestrial Reference Frame (TRF) with an accuracy of 1mm and a long-term stability of 0.1mm/year are relevant for many scientific and societal endeavors. The knowledge of the TRF is fundamental for Earth and navigation sciences. For instance, quantifying sea level change strongly depends on an accurate determination of the geocenter motion but also of the positions of continental and island reference stations, as well as the ground stations of tracking networks. Also, numerous applications in geophysics require absolute millimeter precision from the reference frame, as for example monitoring tectonic motion or crustal deformation for predicting natural hazards. The TRF accuracy to be achieved represents the consensus of various authorities which has enunciated geodesy requirements for Earth sciences. Today we are still far from these ambitious accuracy and stability goals for the realization of the TRF. However, a combination and co-location of all four space geodetic techniques on one satellite platform can significantly contribute to achieving these goals. This is the purpose of the GENESIS mission, proposed as a component of the FutureNAV program of the European Space Agency. The GENESIS platform will be a dynamic space geodetic observatory carrying all the geodetic instruments referenced to one another through carefully calibrated space ties. The co-location of the techniques in space will solve the inconsistencies and biases between the different geodetic techniques in order to reach the TRF accuracy and stability goals endorsed by the various international authorities and the scientific community. The purpose of this white paper is to review the state-of-the-art and explain the benefits of the GENESIS mission in Earth sciences, navigation sciences and metrology.Comment: 31 pages, 9 figures, submitted to Earth, Planets and Space (EPS

Thick multi-layers analysis using high energy PIXE

International audienceA method for multi-layer analysis using high energy PIXE is described. It is based on the variation of the Ka Kb ratio as a function of the detection angle. Experiments have been carried out at the ARRONAX cyclotron using 70 MeV protons in order to validate this method. The thicknesses and the sequences of simple multi-layers targets and more complex targets with hidden layers have been determined using this method

High energy PIXE : a powerful tool to characterize multi-layers thick samples

International audienc

Anisotropic diffusion filter for 3D full waveform inversion: application to a North Sea dataset

Main objectives To present a regularization strategy for seismic imaging using the full waveform which naturally accounts for the structure information contained in the gradient. A comparison with a conventional Gaussian smoothing strategy on a 3D field data from the North sea emphasizes the more accurate reconstruction of the subsurface parameters. New aspects covered The regularization strategy is based on an anisotropic diffusion filter presented in 2D at last EAGE (Madrid 2022). Here the filter is extended to 3D, a specific discretization scheme is used to ensure numerical stability, and the method is applied for the first time to a 3D field data to illustrate its interest for industry scale applications

Mechanochromic luminescence of tricarbonylrhenium complexes.

International audienc

Coherence-enhancing anisotropic diffusion filter for 3D high resolution reconstruction of P-wave velocity and density using full waveform inversion: application to a North Sea Ocean Bottom Cable dataset

International audienceRegularization is a central topic in the study of the solutions of ill-posed inverse problems. High resolution seismic imaging using full waveform inversion belongs to this category of problems. Regularization through anisotropic diffusion, a technique which emerged in the field of image processing, is an interesting alternative to conventional regularization strategies. Exploiting the structural information of a given image, it has the capability to smooth this image along its main structures. The main difficulty is how to design the anisotropic diffusion operator. The concept of coherence enhancing proposed in 2D is extended in 3D and applied so as to filter and enhance the structural coherence of the model updates within a full waveform inversion algorithm. The benefits of this strategy are investigated on a 2D synthetic experiment before considering the multi-parameter inversion of a 3D field dataset from the North sea up to 10 Hz. From this data, the vertical velocity and the density are simultaneously reconstructed. Compared with a conventional nonstationary Gaussian regularization strategy, the models obtained using the coherence enhancing anisotropic diffusion strategy show an enhanced resolution, especially for the density model. The high resolution reflectivity image computed from the impedance volume clearly illustrates the benefit this filtering approach can deliver in terms of structural interpretation