Quelle nouvelle offre audiovisuelle pour la BCU de Fribourg ?

La consommation de musique et de vidéo en ligne a fortement évolué ces dernières années en raison des nombreux contenus disponibles - souvent gratuitement - sur Internet. Alors que les supports optiques semblent voués à disparaître à moyen terme, la BCU de Fribourg a souhaité connaître des alternatives aux CD/DVD et notamment les possibilités de prêt de musique et de vidéo en ligne. Une première partie de ce travail consiste en une synthèse des recherches effectuées sur le sujet et présente certains aspects techniques et juridiques de la diffusion en ligne ainsi que les enjeux d’une offre dématérialisée pour les bibliothèques. Dans un second temps, une étude des offres de différentes bibliothèques (essentiellement en Suisse, France et Allemagne) a été menée afin d’exposer quelques pratiques en bibliothèques et d’identifier les principaux services de musique et vidéo en ligne. La troisième étape consiste en une analyse de la situation actuelle de la BCU de Fribourg à partir de laquelle sont alors proposées, dans la dernière partie, des solutions en ligne adaptées aux besoins de la bibliothèque ainsi que des alternatives aux offres commerciales. La BCU de Fribourg connaît actuellement encore une importante demande pour ses collections physiques cependant, au vu de l’évolution rapide des technologies, elle est consciente qu’elle doit dès aujourd’hui également prendre en compte l’offre de musique et de vidéo en ligne. Ce travail n’apporte par une solution « clé en main ». En effet, les enjeux financiers sont parfois importants et les différentes propositions nécessitent une étude approfondie en termes de faisabilité (économique, organisationnelle et technique). Toutefois, les résultats présentés permettent de se forger une idée de la situation actuelle quant à l’offre audiovisuelle en bibliothèque et fournissent des éléments nécessaires à une prise de décision

Development of a Continuous Pulsed Electric Field (PEF) Vortex-Flow Chamber for Improved Treatment Homogeneity Based on Hydrodynamic Optimization

Pulsed electric fields (PEF) treatment is an effective process for preservation of liquid products in food and biotechnology at reduced temperatures, by causing electroporation. It may contribute to increase retention of heat-labile constituents with similar or enhanced levels of microbial inactivation, compared to thermal processes. However, especially continuous PEF treatments suffer from inhomogeneous treatment conditions. Typically, electric field intensities are highest at the inner wall of the chamber, where the flow velocity of the treated product is lowest. Therefore, inhomogeneities of the electric field within the treatment chamber and associated inhomogeneous temperature fields emerge. For this reason, a specific treatment chamber was designed to obtain more homogeneous flow properties inside the treatment chamber and to reduce local temperature peaks, therefore increasing treatment homogeneity. This was accomplished by a divided inlet into the chamber, consequently generating a swirling flow (vortex). The influence of inlet angles on treatment homogeneity was studied (final values: radial angle α = 61°; axial angle β = 98°), using computational fluid dynamics (CFD). For the final design, the vorticity, i.e., the intensity of the fluid rotation, was the lowest of the investigated values in the first treatment zone (1002.55 1/s), but could be maintained for the longest distance, therefore providing an increased mixing and most homogeneous treatment conditions. The new design was experimentally compared to a conventional co-linear setup, taking into account inactivation efficacy of Microbacterium lacticum as well as retention of heat-sensitive alkaline phosphatase (ALP). Results showed an increase in M. lacticum inactivation (maximum Δlog of 1.8 at pH 7 and 1.1 at pH 4) by the vortex configuration and more homogeneous treatment conditions, as visible by the simulated temperature fields. Therefore, the new setup can contribute to optimize PEF treatment conditions and to further extend PEF applications to currently challenging products

Memobase – Das Portal zum audiovisuellen Erbe der Schweiz

Mit dem multimedialen Portal Memobase macht Memoriav, die Fachstelle für die Erhaltung des audiovisuellen Erbes der Schweiz, Bilder und Töne aus Gedächtnisinstitutionen sicht- und hörbar. Das Portal ermöglicht die Suche in Beständen aus mehr als 60 Institutionen aus allen Sprachregionen der Schweiz. Dazu gehören auch die bewegten Bilder der mehrsprachige Schweizer Filmwochenschau oder Filme über die humanitären Aktionen des Internationalen Komitees vom Roten Kreuz.With the multimedia portal Memobase, Memoriav, the specialist agency for the preservation of Switzerland's audiovisual heritage, makes images and sounds from memory institutions visible and audible. The portal allows users to search in collections from more than 60 institutions from all language regions of Switzerland. It also includes films on the humanitarian actions of the International Committee of the Red Cross or the moving images of the multilingual Swiss newsreel.Peer Reviewe

Exploring the Potential of Head Worn Displays for Manual Work Tasks in Industrial Environments

In this thesis I explore the potential of modern Head-Worn Displays for aiding manual work tasks in the manufacturing industries. In such settings, workers are already supported by using mobile hand-held devices that show instructions and enable the worker to document work tasks. However, the most important disadvantage of hand-held devices is that users need to put them aside when performing tasks that require both of their hands. The current generation of Head-Worn Displays promises hands-free usage with little added complexity and also enables the augmentation of workers’ vision, thereby supporting the work task in a more effective and efficient way. For assessing the potential of Head-Worn Displays on factory floors, a series of studies has been conducted. The studies have been carried out directly on the production line of a German car manufacturer together with workers or in-lab, depending on the study goals. Together with workers and managers in the industrial settings we identified two work tasks whereby support for Head-Worn Displays showed good potential for increasing productivity, quality and worker comfort. The Head-Worn Display support was improved in an iterative manner within a Human-Centred Design approach. The thesis contributes with experiences on introducing Head-Worn Displays in real world settings and for long time periods. The recorded productivity increases attributed to the Head-Worn Displays are discussed, along with worker and manager feedback. For long-term use on a factory floor, extending battery operating time was found to be of central importance. CPU and Camera were identified as the most energy consuming devices and an approach to address that is presented. A benchmark suite is introduced to enable designers, developers, and project managers to make informed decisions when selecting Head-Worn Displays. Finally, a theoretical discussion of Head-Worn Displays is presented by situating them in a sense-based Augmented Reality taxonomy, I proposed.QC 20170426</p

Unterstützung eines manuellen Verwiegeprozesses per Smartwatch

In diesem Beitrag wird anhand der Steuerung des manuellen Verwiegesystems ManDos erläutert, wie eine Smartwatch im industriellen Umfeld genutzt werden kann, um den Nutzern eine möglichst freihändige und ortsungebundene Interaktion zu ermöglichen. Dazu wurde zunächst eine Analyse des bestehenden Systems durchgeführt, im nächsten Schritt ein Konzept und der Anwendungsfall erarbeitet und im letzten Schritt das Konzept realisiert.QC 20201021</p

Unterstützung eines manuellen Verwiegeprozesses per Smartwatch

In diesem Beitrag wird anhand der Steuerung des manuellen Verwiegesystems ManDos erläutert, wie eine Smartwatch im industriellen Umfeld genutzt werden kann, um den Nutzern eine möglichst freihändige und ortsungebundene Interaktion zu ermöglichen. Dazu wurde zunächst eine Analyse des bestehenden Systems durchgeführt, im nächsten Schritt ein Konzept und der Anwendungsfall erarbeitet und im letzten Schritt das Konzept realisiert.QC 20201021</p

Unterstützung eines manuellen Verwiegeprozesses per Smartwatch

In diesem Beitrag wird anhand der Steuerung des manuellen Verwiegesystems ManDos erläutert, wie eine Smartwatch im industriellen Umfeld genutzt werden kann, um den Nutzern eine möglichst freihändige und ortsungebundene Interaktion zu ermöglichen. Dazu wurde zunächst eine Analyse des bestehenden Systems durchgeführt, im nächsten Schritt ein Konzept und der Anwendungsfall erarbeitet und im letzten Schritt das Konzept realisiert.QC 20201021</p

Nanostructured Black Silicon as a Stable and Surface-Sensitive Platform for Time-Resolved In Situ Electrochemical Infrared Absorption Spectroscopy.

Attenuated total reflection surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS) is a powerful method for probing interfacial chemical processes. However, SEIRAS-active nanostructured metallic thin films for the in situ analysis of electrochemical phenomena are often unstable under biased aqueous conditions. In this work, we present a surface-enhancing structure based on etched black Si internal reflection elements with Au-coatings for in situ electrochemical ATR-SEIRAS. Using electrochemical potential-dependent adsorption and desorption of 4-methoxypyridine on Au, we demonstrate that black Si-based substrates offer advantages over commonly used structures, such as electroless-deposited Au on Si and electrodeposited Au on ITO-coated Si, due to the combination of high stability, sensitivity, and conductivity. These characteristics are especially valuable for time-resolved measurements where stable substrates are required over extended times. Furthermore, the low sheet resistance of Au layers on black Si reduces the RC time constant of the electrochemical cell, enabling a significantly higher time resolution compared to that of traditional substrates. Thus, we employ black Si-based substrates in conjunction with rapid- and step-scan Fourier transform infrared (FTIR) spectroscopy to investigate the adsorption and desorption kinetics of 4-methoxypyridine during in situ electrochemical potential steps. Adsorption is shown to be diffusion-limited, which allows for the determination of the mean molecular area in a fully established monolayer. Moreover, no significant changes in the peak ratios of vibrational modes with different orientations relative to the molecular axis are observed, suggesting a single adsorption mode and no alteration of the average molecular orientation during the adsorption process. Overall, this study highlights the enhanced performance of black Si-based substrates for both steady-state and time-resolved in situ electrochemical ATR-SEIRAS, providing a powerful platform for kinetic and mechanistic investigations of electrochemical interfaces