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Evolution of percolating force chains in compressed granular media [article]

Raul Cruz Hidalgo, Christian U. Grosse, Ferenc Kun, Hans W. Reinhardt,, Hans J. Herrmann
2002 arXiv   pre-print
The evolution of effective force chains percolating through a compressed granular system is investigated. We performed experiments by compressing an ensemble of spherical particles in a cylindrical container monitoring the macroscopic constitutive behavior and the acoustic signals emitted by microscopic rearrangements of particles. As a novel approach, we applied the continuous damage model of fiber bundles to describe the evolution of the array of force chains during the loading process. The
more » ... del provides a nonlinear constitutive behavior in good quantitative agreement with the experimental results. For a system of hard particles the model predicts a universal power law divergence of stress when approaching a critical deformation. The amplitude distribution of acoustic signals was found experimentally to follow a power law with exponent δ = 1.15 ± 0.05 which is in a good agreement with the analytic solution of the model.
arXiv:cond-mat/0204077v1 fatcat:kpxwchv3n5aqlji5gjtjkamkby

'the War-Prayer' in U. S. Popular Culture

John J. Han
2009 Journal of Transnational American Studies  
doi:10.5070/t811006974 fatcat:f7us33i6d5cqxo4s6wjieulcum

Alexander invariants of periodic virtual knots [article]

Hans U. Boden and Andrew J. Nicas and Lindsay White
2017 arXiv   pre-print
Assume that ∆ K mod p is divisible by distinct irreducibles u 1 , . . . , u s where s ≥ 1. If K has period p r , then span p ∆ K ≥ (p r − 1) s j=1 span p u j . Proof.  ...  Since u j divides ∆ K mod p and is irreducible, then u j divides either g or f and hence must appear with multiplicity at least p r − 1.  ...  , 3 k , j, k ≥ 2 2 j · 3 k , j, k ≥ 2 6.90232 2 p ≥ 3 -N/A 2 k , k ≥ 2 6.90235 3 p ≥ 5 2 2 , 3 2 2 · 3 2 Table 3 .  ... 
arXiv:1706.02671v1 fatcat:yxt3ow7pnfcphctippe4qrnw3q

Ultra-fast searching assists in evaluating sub-ppm mass accuracy enhancement in U-HPLC/Orbitrap MS data

Arjen Lommen, Arjen Gerssen, J. Efraim Oosterink, Harrie J. Kools, Ainhoa Ruiz-Aracama, Ruud J. B. Peters, Hans G. J. Mol
2010 Metabolomics  
A strategy, detailed methodology description and software are given with which the mass accuracy of U-HPLC-Orbitrap data (resolving power 50,000 FWHM) can be enhanced by an order of magnitude to sub-ppm  ...  Ultra high performance chromatography coupled to Orbitrap mass spectrometry Ultra-high performance chromatography (U-HPLC) is performed on a U-HPLC Accela system (Thermo Fisher Scientific, San Jose, CA  ...  The U-HPLC system consists of a degasser, a quaternary pump, an autosampler and a column oven.  ... 
doi:10.1007/s11306-010-0230-y pmid:21461040 pmcid:PMC3040356 fatcat:mxbt73r3jzhlzdrp4cwwd22t5e

Studies in Metabolism of Trauma

J. U. SCHLEGEL, HANS JORGENSEN
1959 Annals of Surgery  
Treatment of Burns J. U.  ...  Schlegel, J. U., S. Eldrup-J¢rgensen and Stone: Studies in Metabolism of Traum | Maintenance of Homeostasis. Ann Sure 145:12, 1957 Schlegel, J. U., H. Jorgensen, A. McFadde: and W. W.  ... 
doi:10.1097/00000658-195902000-00012 pmid:13627982 pmcid:PMC1450978 fatcat:m35ubmcnpvgmrfesgw362vpgsy

Nicola McLelland, Hans-Jochen Schiewer u. Stefanie Schmitt (Hgg.): Humanismus in der deutschen Literatur des Mittelalters und der Frühen Neuzeit

J. Klaus Kipf
2011 Beiträge zur Geschichte der Deutschen Sprache und Literatur  
Es geht vielmehr um das spezifisch (Früh-)Neuzeitliche dieser Frage. tur 17 um eine Analyse von Hans Folzens ›Quacksalber‹.  ...  Jan-Dirk Müller u. Jörg Robert (Hgg.): Maske und Mosaik. Poetik, Sprache und Wissen im 16.  ... 
doi:10.1515/bgsl.2011.047 fatcat:fhs7y3kjfvd5re3hadbvklnol4

Monitoring, Modeling, and Protecting Against Insulation Failures in the NSTX-U TF Outer Legs

Peter Titus, Han Zhang, S. Raftopoulos, Hans Schneider, C. Freeman, R. Rozenblat, J. Dong, G. Zimmer, G. Tchillinguirian
2019 IEEE Transactions on Plasma Science  
In NSTX-U, the TF in-plane loads are constrained in a similar manner to the temperature strains.  ...  Operating NSTX-U guides these adjustments as the performance is increased and limits are better understood. V.  ... 
doi:10.1109/tps.2019.2924620 fatcat:d6zs2nin5zhy3h7jjakumt7bs4

Evolution of Percolating Force Chains in Compressed Granular Media

Raúl Cruz Hidalgo, Christian U. Grosse, Ferenc Kun, Hans W. Reinhardt, Hans J. Herrmann
2002 Physical Review Letters  
The evolution of effective force chains percolating through a compressed granular system is investigated. We compressed an ensemble of spherical particles monitoring the macroscopic constitutive behavior and the acoustic signals emitted by microscopic rearrangements of particles. We applied the continuous damage model of fiber bundles to describe the evolution of the array of force chains. The model provides a nonlinear constitutive behavior in good quantitative agreement with the experimental
more » ... esults. The amplitude distribution of acoustic signals was found experimentally to follow a power law of an exponent 1:15 0:05, which is in good agreement with the analytic solution of the model.
doi:10.1103/physrevlett.89.205501 pmid:12443484 fatcat:3zwt4qzysjeeffg22f6bv25mry

Structural studies of nanoparticles with an objective-lens Cs-corrected Titan microscope

Z Zhang, J Biskupek, U Kaiser, V V Breus, G U Nienhaus, U Wiedwald, L Han, H-G Boyen, P Ziemann
2007 Microscopy and Microanalysis  
Recent tremendous progress in HRTEM made it possible to achieve sub-Å resolution in a 'midvoltage' microscope through both hardware C s corrector and software correction, i.e., focus-series reconstructions, to extend the resolution defined by Scherzer defocus to an expected information limit less than 1 Å. [1] [2] [3] . Such development in microscopy offers improvement for direct interpretation of image contrast and microanalysis with improved spatial resolution in materials science
more » ... . With the tunable C s , a novel imaging mode is exploited by a combination of a negative Cs and a small overfocus, giving the 'bright atoms' contrast [3] , which is of great importance and particularly beneficial when imaging weakly scattering light elements. It thus opens up a way to look at the material at atomic level in more detail. Further significant benefits provided by aberration-corrections are the characterization of nanometer-sized particles without delocalized contrast and with largely suppressed phase contrast of the supporting substrate, which make precise size measurement and structure analysis as well as particle evolution observation possible. Using a Cs-corrected microscope (Titan FEI 80-300 with field emission gun, HAADF detector and Tridiem system) we here demonstrate some particle examples with particle sizes in the range of ~2-10 nm. The first example concerns the core-shell CdSe/CdS (CdSe/ZnS) nanocrystals synthesized by a colloidal method in an organic solvent with a shell thickness of one to five monolayers. The experimental studies were combined with image calculation, and reveal that direct visualization of the shell is theoretically possible but experimentally difficult to achieve. This is most likely due to atom diffusion between the extreme thin shell and the core or epitaxially growth as the similarities in structure and lattice constants. The Cd-Se dumbbell and twin boundary with a distinct atomic arrangement are clearly visible under a small negative C s and defocus value, as under these conditions, the phase contrasts of substrate is suppressed and the contrasts of Cd and Se is increased [5] . However, the HAADF image on an individual particle shows a slight intensity difference between the edge and the center of the particles. As a catalyst system, the interface between Pt nanoparticles about 2 nm in diameter and carbon nanotube (CNT) is well characterized by using a small Cs value, which enables visualization of a distinct interface contact and the interaction process under the electron beam between the particles and CNT substrate (Fig. 2) . As a result, a thin carbon layer forms outside the Pt particles. Fig. 3 displays the terminated atom arrangements and facet planes of an isolated FePt nanoparticle (fcc) about 5 nm on MgO (001) without fussy delocalization. An appropriate choice of Cs values provides the improvement of image quality and interpretability for such particles, and facilitates the determination of the relationship in betweens. Multiple twin structures in such particles are well resolved as well [5] .
doi:10.1017/s1431927607081299 fatcat:4dmclrvui5dq7jjkdxdr3paw6u

Survival patterns in cystic fibrosis

Warren J. Warwick, Richard E. Pogue, Hans U. Gerber, Cecil J. Nesbitt
1975 Journal of Chronic Diseases  
l.1l.r v, ,u an, Rh., ,.  ... 
doi:10.1016/0021-9681(75)90074-0 pmid:1239460 fatcat:5xps4vjoybaz5jy4uzrkhmrb5y

Alexander invariants of periodic virtual knots

Hans U. Boden, Andrew J. Nicas, Lindsay White
2018 Dissertationes Mathematicae  
Assume that ∆ K mod p is divisible by distinct irreducibles u 1 , . . . , u s where s ≥ 1. If K has period p r , then deg p ∆ K ≥ (p r − 1) s j=1 deg p u j . Proof.  ...  Since u j divides ∆ K mod p and is irreducible, then u j divides either g or f and hence must appear with multiplicity at least p r − 1.  ...  , 3 k , j, k ≥ 2 2 j · 3 k , j, k ≥ 2 6.90232 2 p ≥ 3 -N/A 2 k , k ≥ 2 6.90235 3 p ≥ 5 2 2 , 3 2 2 · 3 2 Table 7 .2: Known and excluded periods of almost classical knots.  ... 
doi:10.4064/dm785-3-2018 fatcat:rlfpfp4odrd3flw5vf2oacvbda

Fermionization via cavity-assisted infinite-range interactions [article]

Paolo Molignini, Camille Lévêque, Hans Kessler, Dieter Jaksch, R. Chitra, Axel U. J. Lode
2021 arXiv   pre-print
t), log 10 (U/µ4) > n.  ...  The black region where log 10 (U/t), log 10 (U/µ4) > 1 is expected to be dominated by U and give rise to complete fermionization.  ... 
arXiv:2107.04040v1 fatcat:3d4i4nygjngbtmcwg7ibnn3bj4

Virtual and welded periods of classical knots [article]

Hans U. Boden, Andrew J. Nicas
2018 arXiv   pre-print
Observe that g 1 " ug 2 and so c g 1 " c ug 2 " c u c g 2 . Since H is abelian and u P H, c u " id H and so c g 1 " c g 2 . Note that H 2 pHq -H 2 pBE K q is infinite cyclic.  ...  This isomorphism is independent of the element g satisfying ϕpHq " g´1Hg because if g´1 1 Hg 1 " g´1 2 Hg 2 , then u " g 1 g´1 2 P N G K pHq, the normalizer of H in G K , and hence u P H since N G K pHq  ... 
arXiv:1711.04051v2 fatcat:nkne25f5l5ch5hncc5vnngr4ja

Discussion of 'The Triassic U–Pb age for the aquatic long-necked protorosaur of Guizhou, China'

Y. B. Wang, D. T. Yang, D. Y. Liu, J. Han, L. T. Wang, J. X. Yao
2014 Geological Magazine  
Based on the sensitive high-resolution ion microscope (SHRIMP) U–Pb zircon age for a volcanic tuff bed within the upper part of the Guanling Formation, we suggested in our study that the age of the fossil  ... 
doi:10.1017/s0016756814000624 fatcat:ecp5r6znong3zosqeyfoow6gta

Far-Ultraviolet Observations of the Monogem Ring

I.-J. Kim, K.-W. Min, K.-I. Seon, J.-W. Park, W. Han, J.-H. Park, U.-W. Nam, J. Edelstein, R. Sankrit, E. J. Korpela
2007 Astrophysical Journal  
All intensities were determined with 13 j significance except for those in parentheses, which were determined with 12 j significance. and the Rosette Nebula at (l, b) ∼ (206.3Њ, Ϫ2.1Њ), as well as the  ...  The results are shown in Table 1 for the lines whose intensities were determined with 13 j significance.  ... 
doi:10.1086/521441 fatcat:3x4ityavljcupioqpuwtfciysu
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