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Search Results: 1 - 10 of 11295 matches for " Markus;Hackermüller "
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Interferometry with large molecules: exploration of coherence, decoherence and novel beam methods
Arndt, Markus;Hackermüller, Lucia;Reiger, Elisabeth;
Brazilian Journal of Physics , 2005, DOI: 10.1590/S0103-97332005000200004
Abstract: quantum experiments with complex objects are of fundamental interest as they allow to quantitatively trace the quantum-to-classical transition under the influence of various interactions between the quantum object and its environment. we briefly review the present status of matter wave interferometry and decoherence studies with large molecules and focus in particular on the challenges for novel beam methods for molecular quantum optics with clusters, macromolecules or nanocrystals.
Theory and experimental verification of Kapitza-Dirac-Talbot-Lau interferometry
Klaus Hornberger,Stefan Gerlich,Hendrik Ulbricht,Lucia Hackermüller,Stefan Nimmrichter,Ilya V. Goldt,Olga Boltalina,Markus Arndt
Physics , 2009, DOI: 10.1088/1367-2630/11/4/043032
Abstract: Kapitza-Dirac-Talbot-Lau interferometry (KDTLI) has recently been established for demonstrating the quantum wave nature of large molecules. A phase space treatment permits us to derive closed equations for the near-field interference pattern, as well as for the Moire-type pattern that would arise if the molecules were to be treated as classical particles. The model provides a simple and elegant way to account for the molecular phase shifts related to the optical dipole potential as well as for the incoherent effect of photon absorption at the second grating. We present experimental results for different molecular masses, polarizabilities and absorption cross sections using fullerenes and fluorofullerenes and discuss the alignment requirements. Our results with C60 and C70, C60F36 and C60F48 verify the theoretical description to a high degree of precision.
Multi-Orbital Quantum Phase Diffusion
Sebastian Will,Thorsten Best,Ulrich Schneider,Lucia Hackermüller,Dirk-S?ren Lühmann,Immanuel Bloch
Physics , 2009,
Abstract: The collapses and revivals of a coherent matter wave field of interacting particles can serve as a sensitive interferometric probe of the interactions and the number statistics of the underlying quantum field. Here we show how the ability to observe long time traces of collapse and revival dynamics of a Bose-Einstein condensate loaded into a three-dimensional (3D) optical lattice allowed us to directly reveal the atom number statistics and the presence of effective coherent multi-particle interactions in a lattice. The multi-particle interactions are generated via virtual transitions to higher lattice orbitals and can find use for simulations of effective field theories with ultracold atoms in optical lattices. We measured their absolute strengths up to the case of six-particle interactions and compare our findings with theory.
Versatile Cold Atom Source for Multi-Species Experiments
Asaf Paris-Mandoki,Matthew D. Jones,Jonathan Nute,Jizhou Wu,Sonali Warriar,Lucia Hackermüller
Physics , 2014, DOI: 10.1063/1.4900577
Abstract: We present a dual-species oven and Zeeman slower setup capable of producing slow, high-flux atomic beams for loading magneto-optical traps. Our compact and versatile system is based on electronic switching between different magnetic field profiles and is applicable to a wide range of multi-species experiments. We give details of the vacuum setup, coils and simple electronic circuitry. In addition, we demonstrate the performance of our system by optimized, sequential loading of magneto-optical traps of lithium-6 and cesium-133.
Matter-wave interferometer for large molecules
B. Brezger,L. Hackermüller,S. Uttenthaler,J. Petschinka,M. Arndt,A. Zeilinger
Physics , 2002, DOI: 10.1103/PhysRevLett.88.100404
Abstract: We demonstrate a near-field Talbot-Lau interferometer for C-70 fullerene molecules. Such interferometers are particularly suitable for larger masses. Using three free-standing gold gratings of one micrometer period and a transversally incoherent but velocity-selected molecular beam, we achieve an interference fringe visibility of 40 % with high count rate. Both the high visibility and its velocity dependence are in good agreement with a quantum simulation that takes into account the van der Waals interaction of the molecules with the gratings and are in striking contrast to a classical moire model.
Reconsidering the Fantastic: An Anthropological Approach
Anthropoetics : the Journal of Generative Anthropology , 1997,
Computational RNomics of Drosophilids
Dominic Rose, J?rg Hackermüller, Stefan Washietl, Kristin Reiche, Jana Hertel, Sven Findei?, Peter F Stadler, Sonja J Prohaska
BMC Genomics , 2007, DOI: 10.1186/1471-2164-8-406
Abstract: The deep-sequencing of 12 drosophilid species coordinated by the NHGRI provides an ideal data set of comparative computational approaches to determine those genomic loci that code for evolutionarily conserved RNA motifs. This class of loci includes the majority of the known small ncRNAs as well as structured RNA motifs in mRNAs. We report here on a genome-wide survey using RNAz.We obtain 16 000 high quality predictions among which we recover the majority of the known ncRNAs. Taking a pessimistically estimated false discovery rate of 40% into account, this implies that at least some ten thousand loci in the Drosophila genome show the hallmarks of stabilizing selection action of RNA structure, and hence are most likely functional at the RNA level. A subset of RNAz predictions overlapping with TRF1 and BRF binding sites [Isogai et al., EMBO J. 26: 79–89 (2007)], which are plausible candidates of Pol III transcripts, have been studied in more detail. Among these sequences we identify several "clusters" of ncRNA candidates with striking structural similarities.The statistical evaluation of the RNAz predictions in comparison with a similar analysis of vertebrate genomes [Washietl et al., Nat. Biotech. 23: 1383–1390 (2005)] shows that qualitatively similar fractions of structured RNAs are found in introns, UTRs, and intergenic regions. The intergenic RNA structures, however, are concentrated much more closely around known protein-coding loci, suggesting that flies have significantly smaller complement of independent structured ncRNAs compared to mammals.High-throughput transcriptome data obtained in particular using tiling arrays [1-6] and cDNA sequencing [7-9] in conjunction with detailed functional studies of individual genes have profoundly changed our picture of eukaryotic gene regulation by emphasizing multiple regulatory layers, many of which involve non-protein-coding RNAs (ncRNAs). In contrast to protein-coding genes, however, ncRNAs do not form a homogeneous group
Fatigability Assessment Using the Fatigue Index Kliniken Schmieder (FKS) Is Not Compromised by Depression  [PDF]
Christian Dettmers, Markus Riegger, Oliver Müller, Manfred Vieten
Health (Health) , 2016, DOI: 10.4236/health.2016.814147
Abstract: Background: Attractor-based kinematic gait analysis using the Fatigue Index Kliniken Schmieder (FKS), have been suggested as a sensitive tool to determine motor fatigability in persons with Multiple Sclerosis (pwMS). Hypothesis: Depression does not affect the FKS to a similar degree as in pwMS. Methods: We recruited 32 patients with major depression. Data were collected with two accelerometers attached to both ankles. Data were recorded for one minute at the beginning and at the end of the treadmill test. Attractor attributes were used to analyze the data. Results: The mean Fatigue Index Kliniken Schmieder (FKS) was 2.1. The change of the attractor (δM) was 3.7 and the change of variability (δD) was 0.6. Mean values were clearly below values of pwMS with fatigability from a previous publication. However, the individual level values from six individuals—five of them showed pain related comorbidity besides depression—fell within the lower pathological range. There was no correlation between Hamilton depression scale and the attractor attributes (δM and δD). Discussion: Depression does not affect gait as motor fatigability does in pwMS. Results from subjects with pain during the treadmill test show a moderately increased variability and moderately altered attractors.
Private security and the state in Latin America: the case of Mexico City
Brazilian Political Science Review (Online) , 2010,
Abstract: this article addresses the relationship between the privatization of security and the state in contemporary mexico city. by presenting an analysis of the development of the local private security market, its regulatory framework and the problems stemming from inefficient enforcement of legal standards, it demonstrates that private security in mexico city is not beyond the state. rather, through formal and informal practices, the local state and its public security agencies play a central role within the recent transformations of local security provision.
Single Cases Promote Knowledge Transfer in the Field of DBS
Markus Christen,Sabine Müller
Frontiers in Integrative Neuroscience , 2011, DOI: 10.3389/fnint.2011.00013
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