Browsing by Subject "Cooling"

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  • Adiabatic spin cooling using high-spin Fermi gases 
    Colomé-Tatché, Maria; Klempt, Carsten; Santos, Luis; Vekua, Teimuraz (Bristol : IOP Publishing Ltd., 2011)
    Spatial entropy redistribution plays a key role in adiabatic cooling of ultra-cold lattice gases. We show that high-spin fermions with a spatially variable quadratic Zeeman coupling may allow for the creation of an inner ...
  • All-optical matter-wave lens using time-averaged potentials 
    Albers, Henning; Corgier, Robin; Herbst, Alexander; Rajagopalan, Ashwin; Schubert, Christian; Vogt, Christian; Woltmann, Marian; Lämmerzahl, Claus; Herrmann, Sven; Charron, Eric; Ertmer, Wofgang; Rasel, Ernst M.; Gaaloul, Naceur; Schlippert, Dennis (London : Springer Nature, 2022)
    The precision of matter-wave sensors benefits from interrogating large-particle-number atomic ensembles at high cycle rates. Quantum-degenerate gases with their low effective temperatures allow for constraining systematic ...
  • Approaches to tailor the cooling supply to the grinding process 
    Denkena, Berend; Bergmann, Benjamin; Gartzke, Tobias; Wilckens, Michael ([Cham] : Springer International Publishing, 2022)
    This study presents original research of the investigation of the coolant supply to the contact area with two different approaches. The cooling and lubrication are key aspects of manufacturing processes such as grinding ...
  • Deceleration, precooling, and multi-pass stopping of highly charged ions in Be+ Coulomb crystals 
    Schmöger, L.; Schwarz, M.; Baumann, T.M.; Versolato, O.O.; Piest, B.; Pfeifer, T.; Ullrich, J.; Schmidt, Piet O.; Crespo López-Urrutia, J.R. (College Park, MD : American Institute of Physics, 2015)
    Preparing highly charged ions (HCIs) in a cold and strongly localized state is of particular interest for frequency metrology and tests of possible spatial and temporal variations of the fine structure constant. Our versatile ...
  • Efficient sympathetic motional-ground-state cooling of a molecular ion 
    Wan, Yong; Gebert, Florian; Wolf, Fabian; Schmidt, Piet O. (College Park, MD : American Physical Society, 2015)
    Cold molecular ions are promising candidates in various fields ranging from precision spectroscopy and test of fundamental physics to ultracold chemistry. Control of internal and external degrees of freedom is a prerequisite ...
  • Engineering the sub-Doppler force in magneto-optical traps 
    Xu, S.; Kaebert, P.; Stepanova, M.; Poll, T.; Siercke, M.; Ospelkaus, S. (College Park, MD : APS, 2022)
    Current dual-frequency magneto-optical traps (MOTs) for ultracold molecules are plagued by sub-Doppler heating effects, making them vastly inferior to standard atomic MOTs. Here we demonstrate theoretically that the ...
  • Hot stamping of load adjusted structural parts 
    Behrens, Bernd-Arno; Bouguecha, Anas; Gaebel, Christoph Michael; Moritz, Jörn; Schrödter, Jens (Amsterdam : Elsevier, 2014)
    The importance of high-strength steel concepts for car bodies has increased in recent years due to the necessity of weight reduction and improved crash safety. By using hot stamping or also known as press hardening of boron ...
  • Influence of process parameters on the hot stamping of carbon-martensitic chromium steel sheets 
    Behrens, Bernd-Arno; Hübner, S.; Sunderkötter, C.; Gebel, L.; Gnaß, S.; Berndt, G.; Trimborn, C.; Pfeffer, C. (Bristol : Institute of Physics Publishing, 2018)
    Hot-stamped components are an important part in steel-intensive automobile lightweight design in which the use of the heat-treatable steel 22MnB5 has been established. However, the field of application is limited by the ...
  • Local Heat Treatment in Draw Bending for Profiles of Manganese Boron Steel 22MnB5 
    Behrens, Bernd-Arno; Bonk, Christian; Hübner, Sven; Uhe, Johanna; Klie, Roman; Moritz, Jörn (London : Elsevier Ltd., 2017)
    Due to the increasing demand for vehicles with a low fuel consumption and consequently low emissions, lightweight construction is an important task in the automotive industry. High-strength profile parts reduce the total ...
  • Maghemite Nanofluid Based on Natural Ester: Cooling and Insulation Properties Assessment 
    Olmo, C.; Mendez, C.; Ortiz, F.; Delgado, F.; Valiente, R.; Werle, P. (Piscataway, NJ : Institute of Electrical and Electronics Engineers Inc., 2019)
    The objective of this work is to study the effect that the addition of magnetic nanoparticles to a natural ester has on its properties and its cooling capacity. Some samples of ferrofluid (natural ester with maghemite) ...
  • Microstructure and wear behaviour of high alloyed hot-work tool steels 1.2343 and 1.2367 under thermo-mechanical loading 
    Malik, I.Y.; Lorenz, U.; Chugreev, A.; Behrens, B.-A. (Bristol : Institute of Physics Publishing, 2019)
    Tools and their maintenance costs in hot forging processes account for a considerable proportion of the total components' costs. Forging tools undergo extreme heating and subsequent cooling during the forging process and ...
  • Numerical process design for targeted residual stress adjustment in hot bulk formed components taking into account macro- and microscale 
    Behrens, Bernd-Arno; Schröder, Jörg; Brands, Dominik; Brunotte, Kai; Wester, Hendrik; Scheunemann, Lisa; Uebing, Sonja; Kock, Christoph (Berlin ; Heidelberg : Springer, 2021)
    The aim of this work is the adjustment of an advantageous compressive residual stress profile in hot-formed components by intelligent process control with tailored cooling from the forging heat. The feasibility and potential ...
  • Sympathetic cooling of mixed-species two-ion crystals for precision spectroscopy 
    Wübbena, Jannes B.; Amairi, Sana; Mandel, Olaf; Schmidt, Piet O. (College Park, MD : American Physical Society, 2012)
    Sympathetic cooling of trapped ions has become an indispensable tool for quantum-information processing and precision spectroscopy. In the simplest situation a single Doppler-cooled ion sympathetically cools another ion ...