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4,764 results on '"Gaertner, M. A."'

1. INTENTAS -- An entanglement-enhanced atomic sensor for microgravity

Author

Anton, O., Bröckel, I., Derr, D., Fieguth, A., Franzke, M., Gärtner, M., Giese, E., Haase, J. S., Hamann, J., Heidt, A., Kanthak, S., Klempt, C., Kruse, J., Krutzik, M., Kubitza, S., Lotz, C., Müller, K., Pahl, J., Rasel, E. M., Schiemangk, M., Schleich, W. P., Schwertfeger, S., Wicht, A., and Wörner, L.

Subjects
Physics - Instrumentation and Detectors, Condensed Matter - Quantum Gases, Physics - Atomic Physics, Physics - Space Physics, Quantum Physics
Abstract

The INTENTAS project aims to develop an atomic sensor utilizing entangled Bose-Einstein condensates (BECs) in a microgravity environment. This key achievement is necessary to advance the capability for measurements that benefit from both entanglement-enhanced sensitivities and extended interrogation times. The project addresses significant challenges related to size, weight, and power management (SWaP) specific to the experimental platform at the Einstein-Elevator in Hannover. The design ensures a low-noise environment essential for the creation and detection of entanglement. Additionally, the apparatus features an innovative approach to the all-optical creation of BECs, providing a flexible system for various configurations and meeting the requirements for rapid turnaround times. Successful demonstration of this technology in the Einstein-Elevator will pave the way for a future deployment in space, where its potential applications will unlock high-precision quantum sensing.

Published
2024

9. Erster Aktionsplan für die nicht vorsätzliche Einbringung und Ausbreitung invasiver Arten gemäß Verordnung (EU) Nr. 1143/2014: Grundlagen, Inhalte und Ausblick. Ergebnisse aus dem F+E-Vorhaben „Erstellung eines Aktions- plans für die prioritären Pfade invasiver gebietsfremder Arten“ (FKZ 3518 82 0600)

Author

Mayer, K., Gaertner, M., Heger, T., Kühn, Ingolf, Tiesmeyer, A., Nehring, S., Mayer, K., Gaertner, M., Heger, T., Kühn, Ingolf, Tiesmeyer, A., and Nehring, S.

Abstract

To implement Regulation (EU) No 1143/2014 on the prevention and management of the in-troduction and spread of invasive alien species, an action plan for the prevention and man-agement of unintentional introduction and spread of invasive alien species needed to be de-veloped by EU member states. This report presents the procedure for drawing up the firstGerman action plan and its contents.The action plan is based on a previous analysis of pathways of introduction and spread ofinvasive alien species which are to be regarded as priority for Germany. For each priority path-way, a literature review was performed to propose possible actions, which were further de-veloped, assessed and substantiated with the help of bilateral talks with experts from all sec-tors involved. Based on a criteria catalogue, altogether 24 measures were selected for theaction plan. The focus of the measures is to raise awareness among the public and affectedparties and to minimize the contamination, for example of goods, vehicles and equipment, byinvasive alien species. 19 different sectors will be involved in implementing the measures. Inaddition to 20 measures specific to single pathways, four measures across sectors and path-ways were developed to allow an effective implementation. The draft measures went througha multi-stage participation and consultation process with the federal ministries involved, aconsultation with the federal states and a public participation, which ensured broad ac-ceptance of the content of the action plan.The first action plan is an important tool in nature conservation for the prevention of biologicalinvasions in Germany and was published in the federal Gazette on 9 August 2021 with an an-nouncement dated 21 June 2021. The present BfN publication also lists further measures thatcould subsequently be included after subsequent review in future action plans in order toprevent the unintentional introduction and spread of invasive species even more effectively.

Published
2024

21. MED-CORDEX INITIATIVE FOR MEDITERRANEAN CLIMATE STUDIES

Author

Ruti, P. M., Somot, S., Giorgi, F., Dubois, C., Flaounas, E., Obermann, A., Dell’Aquila, A., Pisacane, G., Harzallah, A., Lombardi, E., Ahrens, B., Akhtar, N., Alias, A., Arsouze, T., Aznar, R., Bastin, S., Bartholy, J., Béranger, K., Beuvier, J., Bouffies-Cloché, S., Brauch, J., Cabos, W., Calmanti, S., Calvet, J.-C., Carillo, A., Conte, D., Coppola, E., Djurdjevic, V., Drobinski, P., Elizalde-Arellano, A., Gaertner, M., Galàn, P., Gallardo, C., Gualdi, S., Goncalves, M., Jorba, O., Jordà, G., L’Heveder, B., Lebeaupin-Brossier, C., Li, L., Liguori, G., Lionello, P., Maciàs, D., Nabat, P., Önol, B., Raikovic, B., Ramage, K., Sevault, F., Sannino, G., Struglia, M. V., Sanna, A., Torma, C., and Vervatis, V.

Published
2016

23. A proposal for a general interface between land surface schemes and general circulation models

Author

Polcher, J, McAvaney, B, Viterbo, P, Gaertner, M-A, Hahmann, A, Mahfouf, J-F, Noilhan, J, Phillips, T, Pitman, A, Schlosser, CA, Schulz, J-P, Timbal, B, Verseghy, D, and Xue, Y

Subjects
PILPS, land surface schemes, general circulation models, coupling land surface schemes, Earth Sciences, Networking & Telecommunications
Abstract

The aim of this paper is to propose a general interface for coupling general circulation models (GCMs) to land surface schemes (LSS) in order to achieve a plug compatibility between these complex models. As surface parameterizations include more processes, they have moved from being subroutines of GCMs to independent schemes which can also be applied for other purposes. This evolution has raised the problem within climate modeling groups of coupling these schemes to GCMs in a simple and flexible way. As LSS reaches a larger independence, a general interface is needed to enable exchange within the community. This paper discusses the tasks LSS have to fulfill when coupled to a GCM after a review of the current state of the art and the likely future evolutions of both components. The numerical schemes used for the processes which couple the land surfaces to the atmosphere are reviewed to ensure that the interface can be applied to all LSS and GCMs after only minor changes.

Published
1998

24. Deutschlands erster Aktionsplan: präventive Maßnahmen gegen die unbeabsichtigte Einbringung und Ausbreitung invasiver gebietsfremder Arten entlang prioritärer Pfade. Germany's first action plan: Preventive measures against the unintentional introduction and spread of invasive alien species along priority pathways

Author

Mayer, K., Heger, T., Kühn, Ingolf, Tiesmeyer, A., Nehring, S., Gaertner, M., Mayer, K., Heger, T., Kühn, Ingolf, Tiesmeyer, A., Nehring, S., and Gaertner, M.

Abstract

Gemäß der Verordnung (EU) Nr. 1143/2014 über die Prävention und das Management der Einbringung und Ausbreitung invasiver gebietsfremder Arten erstellt jeder Mitgliedstaat der Europäische Union (EU) einen Aktionsplan mit Maßnahmen, die die nicht vorsätzliche Einbringung und Ausbreitung invasiver gebietsfremder Arten verhindern sollen. Im vorliegenden Beitrag wird der erste deutsche Aktionsplan vorgestellt. Der Aktionsplan stützt sich auf eine vorangegangene Analyse, in der ermittelt wurde, welche Einbringungs- und Ausbreitungspfade invasiver gebietsfremder Arten für Deutschland als prioritär anzusehen sind. Für jeden prioritären Pfad erfolgte eine Literaturrecherche nach möglichen Maßnahmenvorschlägen, die mithilfe bilateraler Gespräche mit Expertinnen und Experten aller verantwortlichen Sektoren weiterentwickelt, gewichtet und konkretisiert wurden. Anhand eines Kriterienkatalogs wurden insgesamt 24 Maßnahmen für den Aktionsplan ausgewählt. Die Schwerpunkte dieser Maßnahmen sind, die Öffentlichkeit und betroffene Fachkreise zu sensibilisieren sowie die Kontaminierung, bspw. von Gütern, Fahrzeugen und Geräten, durch invasive gebietsfremde Arten zu minimieren. 19 verschiedene Sektoren werden bei der Umsetzung der Maßnahmen eingebunden. Für eine möglichst effektive Umsetzung wurden neben 20 pfadspezifischen Maßnahmen zusätzlich 4 sektoren- und pfadübergreifende Maßnahmen entwickelt. Der erste Aktionsplan stellt ein wichtiges Instrument im Naturschutz zur Prävention biologischer Invasionen in Deutschland dar.     To implement Regulation (EU) No. 1143/2014, an action plan for the prevention and management of the unintentional introduction and spread of invasive alien species needs to be developed by each EU member state. This paper presents the first German action plan. The action plan is based on a previous analysis of pathways of introduction and spread of invasive alien species which are t

Published
2023

43. Los efectos de la forma de la onda de carga en la estimación de la vida a la fatiga de la capa asfáltica en la estructura del pavimento

Author

Gaertner, M., Staub de Melo, J., and Villena, J.

Subjects
asphalt mixtures, waveforms, rotura por fatiga, numerical simulation, pavimentos flexibles, mezclas asfálticas, onda de carga, Flexible pavements, simulación numérica, fatigue failure
Abstract

Resumen: El fenómeno de fatiga como unos de los principales mecanismos de deterioro de las capas asfálticas. El ensayo de fatiga a flexión a cuatro puntos de apoyo es uno de los procedimientos más utilizados para determinar la resistencia a la fatiga de las mezclas asfálticas. Existen, a nivel internacional, diversas normas que estandarizan este tipo de ensayo, las cuales se diferencian básicamente por la forma de la onda de carga aplicada y por el criterio de rotura utilizado. Este artículo tiene como objetivo presentar los resultados de la influencia del tipo de onda de carga utilizada, haversine o sinusoidal, en la resistencia a la fatiga de una mezcla asfáltica, como también, la influencia de los modelos de fatiga obtenidos en la previsión de la rotura por fatiga de la capa asfáltica en una estructura de un pavimento flexible. Al final, se concluyó que la vida útil de la capa asfáltica estimada utilizando los modelos obtenidos en el ensayo con ondas con forma haversine fue 67 veces mayor que cuando estimada con los modelos de los ensayos realizados con carga sinusoidal. Abstract: The phenomenon of fatigue can be considered as one of the main causes of the asphalt Surface course failure. The Four-Point Bending Apparatus is the widespread equipment used to determine the fatigue resistance of asphalt mixtures. Worldwide there are several standard procedures that rule this test. The main difference between them remains in the waveform, in wich the load is applied, and in the failure criteria. This paper reports the influence from the waveform, haversine orsinusoidal, on the fatigue resistance of an asphalt mixture. In adition, through numerical simulation, it was evaluated ones found on sinusoidal tests.

Published
2019

46. Consistency of climate change projections from multiple global and regional model intercomparison projects

Author

Fernández, J., primary, Frías, M. D., additional, Cabos, W. D., additional, Cofiño, A. S., additional, Domínguez, M., additional, Fita, L., additional, Gaertner, M. A., additional, García-Díez, M., additional, Gutiérrez, J. M., additional, Jiménez-Guerrero, P., additional, Liguori, G., additional, Montávez, J. P., additional, Romera, R., additional, and Sánchez, E., additional

Published
2018
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50. Impact of ocean-atmosphere coupling and high resolution on the simulation of medicanes over the Mediterranean Sea: multi-model analysis with Med-CORDEX and EURO-CORDEX runs

Author

Gaertner M. A., J. J. Gonzalez-Aleman, R. Romera, M. Dominguez, V. Gil, E. Sanchez, C. Gallardo, M. M. Miglietta, K. Walsh, D. Sein, S. Somot, A. dell'Aquila, B. Ahrens, A. Colette, S. Bastin, E. van Meijgaard, G. Nikulin, Instituto de Ciencias Ambientales [Toledo] (ICAM), Universidad de Castilla-La Mancha (UCLM), Institute of Environmental Sciences/ Instituto de Ciencias Medioambientales de Toledo (ICAM), Istituto di Scienze dell'Atmosfera e del Clima (ISAC), Consiglio Nazionale delle Ricerche [Roma] (CNR), University of Melbourne, Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung (AWI), Groupe d'étude de l'atmosphère météorologique (CNRM-GAME), Institut national des sciences de l'Univers (INSU - CNRS)-Météo France-Centre National de la Recherche Scientifique (CNRS), Agenzia Nazionale per le nuove Tecnologie, l’energia e lo sviluppo economico sostenibile (ENEA), Institut für Atmosphäre und Umwelt [Frankfurt/Main] (IAU), Goethe-Universität Frankfurt am Main, Institut National de l'Environnement Industriel et des Risques (INERIS), SPACE - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Royal Netherlands Meteorological Institute (KNMI), Rossby Centre, SMHI, Norrköping, 601 76, Sweden, Swedish Meteorological and Hydrological Institute (SMHI), Universidad de Castilla-La Mancha = University of Castilla-La Mancha (UCLM), National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR), Centre national de recherches météorologiques (CNRM), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), and Agenzia Nazionale per le nuove Tecnologie, l’energia e lo sviluppo economico sostenibile = Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA)

Subjects
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph], Medicanes
Abstract

International audience; Medicanes are cyclones over the Mediterranean Sea having a tropical structure and a rather small size, for which the sea-atmosphere interaction plays a fundamental role. High resolution and ocean-atmosphere coupled RCM simulations performed in MedCORDEX and EURO-CORDEX projects are used to analyze the ability of RCMs to represent the observed characteristics of medicanes, and the impact of increasing resolution and using air-sea coupling on its simulation. An observational database based on satellite images combined with very high resolution simulations (Miglietta et al. 2013) is used as the reference for evaluating the simulations. The simulated medicanes do not coincide in general with the observed cases, so that the evaluation should be done in a statistical sense. The spatial distribution of medicanes is generally well simulated, while the monthly distribution reveals the difficulty of simulating the first medicanes appearing in September after the summer minimum. Large differences are found among models, supporting the use of multi-model ensembles. Interesting trade-offs are found for some models, as better values for intensity are associated to worse frequency values in one model, or relatively good values of frequency and intensity are obtained at the expense of a damped air-sea interaction in a model with spectral nudging. High resolution has a strong and positive impact on the frequency of simulated medicanes, while the effect on its intensity is less clear. Air-sea coupling reduces the medicane frequency, as could be expected due to a negative intensity feedback that is known for tropical cyclones. A preliminary analysis indicates that this feedback could depend on the oceanic mixed layer depth, increasing the interest of applying ocean-atmosphere coupled RCMs

Published
2016

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