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  • 1
    Electronic Resource
    Electronic Resource
    Identifying Coulomb and Viscous Friction from Free-Vibration Decrements (1998)
    Springer
    Nonlinear dynamics 16 (1998), S. 337-347 
    Details
    ISSN: 1573-269X
    Keywords: Friction oscillator ; friction estimation ; friction identification ; Coulomb friction ; free vibration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract This study focuses on an algorithm for the simultaneous identification of Coulomb and viscous damping effects from free-vibration decrements in a damped linear single degree-of-freedom (DOF) mass-spring system. Analysis shows that both damping effects can indeed be separated. Numerical study of a combined-damping system demonstrates a perfect match between the simulation parameters and the estimated values. Experimental study includes two types of real systems. The method is applied to an experimental industrial bearing. Experimental results are compared with numerical simulations to illustrate the reliability of this method. An analysis provides conservative bounds on error estimates. An example of the effect of quantization error on the estimations is included.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008213814102
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    Paper (German National Licenses)
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  • 2
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    Analytical ground state for the Jaynes-Cummings model with ultrastrong coupling (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-06-18
    Description: Author(s): Yuanwei Zhang, Gang Chen, Lixian Yu, Qifeng Liang, J.-Q. Liang, and Suotang Jia We present a generalized variational method to analytically obtain the ground-state properties of the Jaynes-Cummings model with the ultrastrong coupling. An explicit expression for the ground-state energy, which agrees well with the numerical simulation in a wide range of the experimental parameter... [Phys. Rev. A 83, 065802] Published Fri Jun 17, 2011
    Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Genetic Determinant for Amino Acid Metabolites and Changes in Body Weight and Insulin Resistance in Response to Weight-Loss Diets: The Preventing Overweight Using Novel Dietary Strategies (POUNDS LOST) Trial [Epidemiology and Prevention] (2013)
    American Heart Association (AHA)
    Details
    Publication Date: 2013-03-26
    Description: Background— Circulating branched-chain amino acids and aromatic amino acids were recently related to insulin resistance and diabetes mellitus in prospective cohorts. We tested the effects of a genetic determinant of branched-chain amino acid/aromatic amino acid ratio on changes in body weight and insulin resistance in a 2-year diet intervention trial. Methods and Results— We genotyped the branched-chain amino acid/aromatic amino acid ratio—associated variant rs1440581 near the PPM1K gene in 734 overweight or obese adults who were assigned to 1 of 4 diets varying in macronutrient content. At 6 months, dietary fat significantly modified genetic effects on changes in weight, fasting insulin, and homeostasis model assessment of insulin resistance (HOMA-IR) after adjustment for the confounders (all P for interaction ≤0.006). Further adjustment for weight change did not appreciably change the interactions for fasting insulin and HOMA-IR. In the high-fat diet group, the C allele was related to less weight loss and smaller decreases in serum insulin and HOMA-IR (all P ≤ 0.02 in an additive pattern), whereas an opposite genotype effect on changes in insulin and HOMA-IR was observed in the low-fat diet group ( P =0.02 and P =0.04, respectively). At 2 years, the gene-diet interactions remained significant for weight loss ( P =0.008) but became null for changes in serum insulin and HOMA-IR resulting from weight regain. Conclusions— Individuals carrying the C allele of the branched-chain amino acid/aromatic amino acid ratio—associated variant rs1440581 may benefit less in weight loss and improvement of insulin sensitivity than those without this allele when undertaking an energy-restricted high-fat diet. Clinical Trial Registration— URL: http://www.clinicaltrials.gov . Unique identifier: NCT00072995.
    Keywords: Clinical genetics, Epidemiology
    Electronic ISSN: 1524-4539
    Topics: Medicine
    Published by American Heart Association (AHA)
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  • 4
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    Time-bin-entangled photon holes (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-11-29
    Description: Author(s): J. Liang, J. D. Franson, and T. B. Pittman The general concept of entangled photon holes is based on a correlated absence of photon pairs in an otherwise constant optical background. Here we consider the specialized case when this background is confined to two well-defined time bins, which allows the formation of time-bin-entangled photon ho... [Phys. Rev. A 86, 053831] Published Wed Nov 28, 2012
    Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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