Université franco-allemande

Abstract Photon upconversion via triplet‐triplet annihilation (TTA‐UC) is a well‐known process that converts low‐energy light into higher‐energy light. This process has attracted attention for its potential in various fields, including light‐emitting devices, power generation and medical applications. It is desirable to develop TTA‐UC materials of TTA emitters with large TTA rate constants (kTTA). However, molecular design to accelerate the bimolecular rate constant of kTTA has not been considered. We present a strategy to manipulate kTTA by assembling multiple chromophores linked to a boron in a rotationally symmetric manner, causing asymmetric motions by a localized triplet exciton. We have studied tri(9‐anthryl)borane, which consists of three anthracenes linked via boron, as a TTA emitter. Time‐resolved luminescence measurements confirmed that kTTA is improved compared to the conventional TTA‐UC system using DPA, an anthracene‐based monomer. Time‐resolved electron paramagnetic resonance measurements showed that the improvement in kTTA is due to fast intramolecular triplet exciton hopping coupled with vibrational motions in the trimer molecule, which extends the reactivity at the collision distance between the excitons through the pseudo‐rotational motions. This molecular design that enhances TTA reactivity is expected to contribute to the future development of TTA‐UC materials for sensing fluid environment.

Abstract Challenges of the fourth industrial revolution such as shorter product life cycles and increasing product variance require the continuous use of digital technologies in production. Only through these solutions the use of adaptable systems is possible. In this context, the Digital Twin is of crucial importance. The Digital Twin is represented across multiple sectors to meet the technological change. In manufacturing companies its areas of application are versatile. The usage can range from production planning and production monitoring to production optimization. In order to be able to use the advantages of the Digital Twin in the mentioned areas, a targeted data aggregation is necessary. In this paper a cross-application workflow for the efficient planning and usage of Digital Twins is presented. The workflow covers the whole process from the goal and requirement definition up to the implementation and usage of the technology. Particular attention is paid to the aggregation and usage of data in Digital Twins. The developed workflow is evaluated based on an adaptable assembly system.

The environmental transformation of economies and the increasing demand for green technologies should offer opportunities for suppliers of green offerings. Yet, suppliers face challenges in convincing business-to-business customers to invest in environmentally-beneficial technology offerings as decision-makers are often not aware of the environmental and financial benefits of these solutions. To overcome these challenges, technology vendors can use sustainability-oriented value propositions. However, little is known so far on the effects of different value proposition strategies on investment decisions, as most studies use qualitative approaches and investigate value propositions through the lens of the vendors. We therefore conducted a scenario-based experiment, through which we investigated whether the three different value proposition strategies monetization, certification and risk assessment influence investment preferences of buyer firms’ decision-makers. Our results provide empirical support for the effectiveness of sustainability-oriented value propositions on buyers’ decision-making. Finally, moderation analysis indicates that the certification strategy is more effective for buyers in markets with low uncertainty, while risk assessment is for buyers in high uncertainty markets.

La guerre d’Ukraine, la découverte de l’échec des stratégies purement diplomatiques, de la dépendance vis-à-vis de la Russie, de l’ambiguïté de la position chinoise, obligent l’Allemagne, dans une conjoncture politique complexe, à redéfinir les fondamentaux de sa politique extérieure et de sa politique de sécurité.

While existing literature shows that a consumer’s regulatory focus has an impact on innovation adoption, investigations regarding the effect of regulatory fit in this context are rather scarce. Furthermore, prior investigations are predominantly limited to consideration of either the chronic regulatory focus (CRF) or the temporary regulatory focus (TRF) and have rarely considered the interaction of both. This article aims to fill this gap by conducting two studies. In the first study, we examine whether a regulatory fit (non-fit) between consumer’s CRF and the product-related focus has an impact on consumer’s adoption intention. Within the second study, we observe whether inducing a TRF would enhance or attenuate the effects found in study 1 respectively. Results show that adoption intention are higher for consumers in regulatory fit compared to non-fit conditions. Furthermore, our findings indicate that inducing a TRF is only promising in regulatory non-fit conditions.

Die 1997 durch das Weimarer Abkommen (Weimarer Abkommen 1997) gegrundete DFH ist eine binationale Hochschulstruktur, die in ihrer Form und in ihren Aufgaben weltweit einzigartig ist. Die DFH betreut deutsch-franzosische Studiengange und setzt sie um; zudem fordert sie binationale Forschungsprogramme und bietet franzosischen und deutschen Nachwuchswissenschaftlern Unterstutzung. Daruber hinaus ist sie seit mehreren Jahren in Projekte eingebunden, die den Erfahrungsaustausch in innovativen beziehungsweise bislang wenig erforschten akademischen Bereichen fordern.

Le traité d’Aix-la-Chapelle, sous de multiples engagements, dissimule nombre de désaccords : sur la défense, l’avenir de l’Union européenne, les politiques économiques, les rapports avec la Russie… La campagne pour les élections européennes a d’ailleurs éclairé ces divergences. L’ensemble franco-allemand a néanmoins réussi à préserver une étonnante capacité de compromis : c’est sur cette capacité que s’appuie sa durabilité, au-delà d’un traité qui pourrait ne pas remplir ses promesses.

Tarefas de geometria dinâmica têm um papel fundamental no ensino e aprendizagem de matemática, pois podem ampliar as possibilidades de abordagem dos conceitos geométricos estudados na Educação Básica. Assim, o objetivo deste artigo foi o de apresentar e caracterizar tarefas de geometria dinâmica que envolvem o uso de Objetos de Aprendizagem (OA) para a exploração e a investigação de conceitos geométricos. As tarefas foram elaboradas considerando os princípios metodológicos teorizados por Powell e Alqahtani (2015) e Powell e Pazuch (2016) para um trabalho investigativo usando Softwares de Geometria Dinâmica (SGD). A primeira tarefa foi desenvolvida para abordar as propriedades geométricas dos quadriláteros, enquanto a segunda permite o trabalho com as transformações geométricas presentes na animação do OA, o qual foi elaborado com o software GeoGebra. Os resultados mostram que essas tarefas podem contribuir para a prática do professor que ensina geometria e deseja integrar tecnologias digitais a seu trabalho em sala de aula.

En poste en Hongrie entre 1956-1962, le diplomate Jean Paul-Boncour (1898-1973) connaissait déjà la région pour y avoir été représentant de la France à Bucarest entre 1945-1947. Il fut chef de mission à la Légation française à Budapest durant l’insurrection hongroise de 1956, dont il fut un témoin privilégié. S’il fut très marqué par l’écrasement de la révolte et soutenait de manière discrète la résistance, il n’a pas rompu toute relation avec les nouvelles autorités. Profondément anticommuniste, Jean Paul-Boncour faisait régulièrement part de son désaccord avec le régime, et ne craignait pas de montrer sa sympathie à l’égard des opposants. Avec son épouse il a soutenu des résistants, malgré la surveillance de la police hongroise. De manière contradictoire, les relations franco-hongroises s’améliorèrent progressivement à partir de 1960, mais la présence de Jean Paul-Boncour devint peu à peu un obstacle à ce processus. Paris finit par le rappeler en 1962. Avant sa retraite définitive il fut encore nommé ambassadeur à Buenos Aires.