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Entropy, Volume 19, Issue 11

November 2017 - 65 articles

Cover Story: Already Leonardo da Vinci (1452–1519) realized that turbulent flows can be basically separated in what he called “principal current” and “random and reverse motion”. In this issue, a first theoretical approach to turbulence as a critical phenomenon with the two phases “laminar streaks” and “vorticity-rich islands” is proposed in the form of a mean field theory with strong analogies to magnetism. Existing experiments give qualitative support to such a macroscopic description of turbulence. View the paper
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Articles (65)

  • Article
  • Open Access
1 Citations
4,376 Views
18 Pages

Metacomputable

  • Piotr Bołtuć

22 November 2017

The paper introduces the notion of “metacomputable” processes as those which are the product of computable processes. This notion seems interesting in the instance when metacomputable processes may not be computable themselves, but are produced by co...

  • Article
  • Open Access
125 Citations
15,895 Views
14 Pages

22 November 2017

Starting with a new formulation for the mutual information (MI) between a pair of events, this paper derives alternative upper bounds and extends those to the case of two discrete random variables. Normalized mutual information (NMI) measures are the...

  • Article
  • Open Access
1 Citations
3,701 Views
10 Pages

Dynamic and Thermodynamic Properties of a CA Engine with Non-Instantaneous Adiabats

  • Ricardo T. Paéz-Hernández,
  • Norma Sánchez-Salas,
  • Juan C. Chimal-Eguía and
  • Delfino Ladino-Luna

22 November 2017

This paper presents an analysis of a Curzon and Alhborn thermal engine model where both internal irreversibilities and non-instantaneous adiabatic branches are considered, operating with maximum ecological function and maximum power output regimes. I...

  • Article
  • Open Access
2 Citations
4,720 Views
20 Pages

Parametric PET Image Reconstruction via Regional Spatial Bases and Pharmacokinetic Time Activity Model

  • Naoki Kawamura,
  • Tatsuya Yokota,
  • Hidekata Hontani,
  • Muneyuki Sakata and
  • Yuichi Kimura

22 November 2017

It is known that the process of reconstruction of a Positron Emission Tomography (PET) image from sinogram data is very sensitive to measurement noises; it is still an important research topic to reconstruct PET images with high signal-to-noise ratio...

  • Article
  • Open Access
5,369 Views
18 Pages

Design of Rate-Compatible Parallel Concatenated Punctured Polar Codes for IR-HARQ Transmission Schemes

  • Jian Jiao,
  • Sha Wang,
  • Bowen Feng,
  • Shushi Gu,
  • Shaohua Wu and
  • Qinyu Zhang

21 November 2017

In this paper, we propose a rate-compatible (RC) parallel concatenated punctured polar (PCPP) codes for incremental redundancy hybrid automatic repeat request (IR-HARQ) transmission schemes, which can transmit multiple data blocks over a time-varying...

  • Feature Paper
  • Article
  • Open Access
43 Citations
11,144 Views
27 Pages

Variational Characterization of Free Energy: Theory and Algorithms

  • Carsten Hartmann,
  • Lorenz Richter,
  • Christof Schütte and
  • Wei Zhang

20 November 2017

The article surveys and extends variational formulations of the thermodynamic free energy and discusses their information-theoretic content from the perspective of mathematical statistics. We revisit the well-known Jarzynski equality for nonequilibri...

  • Article
  • Open Access
1 Citations
5,090 Views
29 Pages

20 November 2017

The classical quadratic loss for the partially linear model (PLM) and the likelihood function for the generalized PLM are not resistant to outliers. This inspires us to propose a class of “robust-Bregman divergence (BD)” estimators of both the parame...

  • Article
  • Open Access
14 Citations
7,683 Views
13 Pages

19 November 2017

The objective of this study is to re-evaluate the relation between surface electromyogram (EMG) and muscle contraction torque in biceps brachii (BB) muscles of healthy subjects using two different complexity measures. Ten healthy subjects were recrui...

  • Article
  • Open Access
10 Citations
6,570 Views
11 Pages

18 November 2017

Foam systems have been attracting extensive attention due to their importance in a variety of applications, e.g., in the cleaning industry, and in bubble flotation. In the context of flotation chemistry, flotation performance is strongly affected by...

  • Article
  • Open Access
22 Citations
5,365 Views
18 Pages

18 November 2017

Bearing vibration response studies are crucial for the condition monitoring of bearings and the quality inspection of rotating machinery systems. However, it is still very difficult to diagnose bearing faults, especially rolling element faults, due t...

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Entropy - ISSN 1099-4300