Ulrich, Stephan

[["dc.bibliographiccitation.firstpage","1"],["dc.bibliographiccitation.issue","14"],["dc.bibliographiccitation.journal","Physical Review Letters"],["dc.bibliographiccitation.lastpage","4"],["dc.bibliographiccitation.volume","102"],["dc.contributor.author","Ulrich, Stephan"],["dc.contributor.author","Aspelmeier, Timo"],["dc.contributor.author","Roeller, Klaus"],["dc.contributor.author","Fingerle, Axel"],["dc.contributor.author","Herminghaus, Stephan"],["dc.contributor.author","Zippelius, Annette"],["dc.date.accessioned","2021-06-01T10:47:05Z"],["dc.date.available","2021-06-01T10:47:05Z"],["dc.date.issued","2009"],["dc.description.abstract","Wet granular materials are characterized by a defined bond energy in their particle interaction such that breaking a bond implies an irreversible loss of a fixed amount of energy. Associated with the bond energy is a nonequilibrium transition, setting in as the granular temperature falls below the bond energy. The subsequent aggregation of particles into clusters is shown to be a self-similar growth process with a cluster size distribution that obeys scaling. In the early phase of aggregation the clusters are fractals with Df=2, for later times we observe gelation. We use simple scaling arguments to derive the temperature decay in the early and late stages of cooling and verify our results with event-driven simulations."],["dc.identifier.doi","10.1103/PhysRevLett.102.148002"],["dc.identifier.gro","3146215"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/85479"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-425"],["dc.notes.status","final"],["dc.relation.eissn","1079-7114"],["dc.relation.issn","0031-9007"],["dc.title","Cooling and Aggregation in Wet Granulates"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Physical Review Letters"],["dc.bibliographiccitation.volume","111"],["dc.contributor.author","Neudecker, Max"],["dc.contributor.author","Ulrich, Stephan"],["dc.contributor.author","Herminghaus, Stephan"],["dc.contributor.author","Schröter, Matthias"],["dc.date.accessioned","2021-06-01T10:47:06Z"],["dc.date.available","2021-06-01T10:47:06Z"],["dc.date.issued","2013"],["dc.description.abstract","We prepare packings of frictional tetrahedra with volume fractions ϕ ranging from 0.469 to 0.622 using three different experimental protocols under isobaric conditions. Analysis via x-ray microtomography reveals that the contact number Z grows with ϕ, but does depend on the preparation protocol. While there exist four different types of contacts in tetrahedra packings, our analysis shows that the edge-to-face contacts contribute about 50% of the total increase in Z. The number of constraints per particle C increases also with ϕ and even the loosest packings are strongly hyperstatic, i.e., mechanically overdetermined with C approximately twice the degrees of freedom each particle possesses."],["dc.identifier.doi","10.1103/PhysRevLett.111.028001"],["dc.identifier.gro","3146169"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/85482"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-425"],["dc.notes.status","public"],["dc.relation.eissn","1079-7114"],["dc.relation.issn","0031-9007"],["dc.title","Jammed Frictional Tetrahedra are Hyperstatic"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","031306"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Physical Review. E"],["dc.bibliographiccitation.volume","80"],["dc.contributor.author","Ulrich, Stephan"],["dc.contributor.author","Aspelmeier, Timo"],["dc.contributor.author","Zippelius, Annette"],["dc.contributor.author","Roeller, Klaus"],["dc.contributor.author","Fingerle, Axel"],["dc.contributor.author","Herminghaus, Stephan"],["dc.date.accessioned","2018-11-07T11:25:24Z"],["dc.date.available","2018-11-07T11:25:24Z"],["dc.date.issued","2009"],["dc.description.abstract","We investigate a gas of wet granular particles covered by a thin liquid film. The dynamic evolution is governed by two-particle interactions, which are mainly due to interfacial forces in contrast to dry granular gases. When two wet grains collide, a capillary bridge is formed and stays intact up to a certain distance of withdrawal when the bridge ruptures, dissipating a fixed amount of energy. A freely cooling system is shown to undergo a nonequilibrium dynamic phase transition from a state with mainly single particles and fast cooling to a state with growing aggregates such that bridge rupture becomes a rare event and cooling is slow. In the early stage of cluster growth, aggregation is a self-similar process with a fractal dimension of the aggregates approximately equal to D(f) approximate to 2. At later times, a percolating cluster is observed which ultimately absorbs all the particles. The final cluster is compact on large length scales, but fractal with D(f) approximate to 2 on small length scales."],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft (DFG) [SFB 602/B6]"],["dc.identifier.doi","10.1103/PhysRevE.80.031306"],["dc.identifier.isi","000270383400069"],["dc.identifier.pmid","19905109"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/56613"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Physical Soc"],["dc.relation.issn","1539-3755"],["dc.title","Dilute wet granular particles: Nonequilibrium dynamics and structure formation"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]