نتایج جستجو برای: fidelity

تعداد نتایج: 25412  

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2010
Boris Gutkin Daniel Waltner Martha Gutiérrez Jack Kuipers Klaus Richter

By considering correlations between classical orbits we derive semiclassical expressions for the decay of the quantum fidelity amplitude for classically chaotic quantum systems, as well as for its squared modulus, the fidelity or Loschmidt echo. Our semiclassical results for the fidelity amplitude agree with random matrix theory (RMT) and supersymmetry predictions in the universal Fermi-golden ...

2013
Johannes Hohlbein Louise Aigrain Timothy D. Craggs Oya Bermek Olga Potapova Pouya Shoolizadeh Nigel D. F. Grindley Catherine M. Joyce Achillefs N. Kapanidis

The fidelity of DNA polymerases depends on conformational changes that promote the rejection of incorrect nucleotides before phosphoryl transfer. Here, we combine single-molecule FRET with the use of DNA polymerase I and various fidelity mutants to highlight mechanisms by which active-site side chains influence the conformational transitions and free-energy landscape that underlie fidelity deci...

2015
JIN LI RAJESH PEREIRA

We consider quantum fidelity between two states ρ and σ, where we fix ρ and allow σ to be sent through a quantum channel. We determine the minimal fidelity where one minimizes over (a) all unital channels, (b) all mixed unitary channels, and (c) arbitrary channels. We derive results involving the minimal eigenvalue of ρ, which we can interpret as a convex combination coefficient. As a consequen...

Journal: :Int. J. Comput. Math. 2014
Oleg Roderick Mihai Anitescu Yulia Peet

We investigate uncertainty propagation in the context of high-end complex simulation codes, whose runtime on one configuration is on the order of the total limit of computational resources. To this end, we study the use of lower-fidelity data generated by proper orthogonal decomposition-based model reduction. A Gaussian process approach is used to model the difference between the higher-fidelit...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2007
Wen-Long You Ying-Wai Li Shi-Jian Gu

Motivated by the growing importance of fidelity in quantum critical phenomena, we establish a general relation between the fidelity and structure factor of the driving term in a Hamiltonian through the concept of fidelity susceptibility. Our discovery, as shown by some examples, facilitates the evaluation of fidelity in terms of susceptibility using well-developed techniques, such as density ma...

2015
Sarah Ibrahim Souraya Sidani S. Ibrahim S. Sidani

Background: Interventions, whether simple or complex, are increasing in health care in response to the growing complexity and acuity of patient’s conditions. Monitoring the fidelity of implementing interventions is challenging. A common method to assess and monitor fidelity of intervention implementation is through a structured, reliable and valid instrument. Purpose: The purpose of this paper ...

2015
Nicholas P. Klingaman Xianan Jiang Prince K. Xavier Jon Petch Steven J. Woolnough

The “Vertical structure and physical processes of the Madden-Julian oscillation (MJO)” project comprises three experiments, designed to evaluate comprehensively the heating, moistening, and momentum associated with tropical convection in general circulation models (GCMs). We consider here only those GCMs that performed all experiments. Some models display relatively higher or lower MJO fidelity...

2007
Deborah J. Howell Olivier L. de Weck David W. Miller Deborah Jane Howell

As technology employed in complex multidisciplinary systems such as high performance telescope systems becomes ever more sophisticated, simulation is becoming more important during the initial design phases. The method of building these simulation models is often based on engineering experience with older, potentially dissimilar systems. A method is needed to measure the fidelity of simulation ...

2012
S. KOZIEL S. OGURTSOV S. SZCZEPANSKI

An approach to rapid optimization of antennas using the shape-preserving response-prediction (SPRP) technique and coarsediscretization electromagnetic (EM) simulations (as a low-fidelity model) is presented. SPRP allows us to estimate the response of the high-fidelity EM antenna model, e.g., its reflection coefficient versus frequency, using the properly selected set of so-called characteristic...

Journal: :The British journal of psychiatry : the journal of mental science 2003
Matthew Fiander Tom Burns Gregory J McHugo Robert E Drake

BACKGROUND The significant reductions in hospital admission demonstrated in US assertive community treatment (ACT) studies have not been replicated in the UK. Explanations cite poor UK 'model fidelity' and/or better UK standard care. No international model-fidelity comparisons exist. AIMS To compare high-fidelity US ACT teams with a UK team. METHOD The UK 700's ACT team (n=97) was compared ...

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