WorldWideScience

Sample records for roma rank-ordered multifractal

  1. ROMA (Rank-Ordered Multifractal Analyses of intermittency in space plasmas – a brief tutorial review

    Directory of Open Access Journals (Sweden)

    T. Chang

    2010-10-01

    Full Text Available Intermittent fluctuations are the consequence of the dynamic interactions of multiple coherent or pseudo-coherent structures of varied sizes in the stochastic media (Chang, 1999. We briefly review here a recently developed technique, the Rank-Ordered Multifractal Analysis (ROMA, which is both physically explicable and quantitatively accurate in deciphering the multifractal characteristics of such intermittent structures (Chang and Wu, 2008.

    The utility of the method is demonstrated using results obtained from large-scale 2-D MHD simulations as well as in-situ observations of magnetic field fluctuations from the interplanetary and magnetospheric cusp regions, and the broadband electric field oscillations from the auroral zone.

  2. Application of rank-ordered multifractal analysis (ROMA) to intermittent fluctuations in 3D turbulent flows, 2D MHD simulation and solar wind data

    Science.gov (United States)

    Wu, C.; Chang, T.

    2010-12-01

    A new method in describing the multifractal characteristics of intermittent events was introduced by Cheng and Wu [Chang T. and Wu C.C., Physical Rev, E77, 045401(R), 2008]. The procedure provides a natural connection between the rank-ordered spectrum and the idea of one-parameter scaling for monofractals. This technique has been demonstrated using results obtained from a 2D MHD simulation. It has also been successfully applied to in-situ solar wind observations [Chang T., Wu, C.C. and Podesta, J., AIP Conf Proc. 1039, 75, 2008], and the broadband electric field oscillations from the auroral zone [Tam, S.W.Y. et al., Physical Rev, E81, 036414, 2010]. We take the next step in this procedure. By using the ROMA spectra and the scaled probability distribution functions (PDFs), raw PDFs can be calculated, which can be compared directly with PDFs from observations or simulation results. In addition to 2D MHD simulation results and in-situ solar wind observation, we show clearly using the ROMA analysis the multifractal character of the 3D fluid simulation data obtained from the JHU turbulence database cluster at http://turbulence.pha.jhu.edu. In particular, we show the scaling of the non-symmetrical PDF for the parallel-velocity fluctuations of this 3D fluid data.

  3. Striations in PageRank-Ordered Matrices

    CERN Document Server

    Pennycuff, Corey

    2016-01-01

    Patterns often appear in a variety of large, real-world networks, and interesting physical phenomena are often explained by network topology as in the case of the bow-tie structure of the World Wide Web, or the small world phenomenon in social networks. The discovery and modelling of such regular patterns has a wide application from disease propagation to financial markets. In this work we describe a newly discovered regularly occurring striation pattern found in the PageRank ordering of adjacency matrices that encode real-world networks. We demonstrate that these striations are the result of well-known graph generation processes resulting in regularities that are manifest in the typical neighborhood distribution. The spectral view explored in this paper encodes a tremendous amount about the explicit and implicit topology of a given network, so we also discuss the interesting network properties, outliers and anomalies that a viewer can determine from a brief look at the re-ordered matrix.

  4. Maximising information recovery from rank-order codes

    Science.gov (United States)

    Sen, B.; Furber, S.

    2007-04-01

    The central nervous system encodes information in sequences of asynchronously generated voltage spikes, but the precise details of this encoding are not well understood. Thorpe proposed rank-order codes as an explanation of the observed speed of information processing in the human visual system. The work described in this paper is inspired by the performance of SpikeNET, a biologically inspired neural architecture using rank-order codes for information processing, and is based on the retinal model developed by VanRullen and Thorpe. This model mimics retinal information processing by passing an input image through a bank of Difference of Gaussian (DoG) filters and then encoding the resulting coefficients in rank-order. To test the effectiveness of this encoding in capturing the information content of an image, the rank-order representation is decoded to reconstruct an image that can be compared with the original. The reconstruction uses a look-up table to infer the filter coefficients from their rank in the encoded image. Since the DoG filters are approximately orthogonal functions, they are treated as their own inverses in the reconstruction process. We obtained a quantitative measure of the perceptually important information retained in the reconstructed image relative to the original using a slightly modified version of an objective metric proposed by Petrovic. It is observed that around 75% of the perceptually important information is retained in the reconstruction. In the present work we reconstruct the input using a pseudo-inverse of the DoG filter-bank with the aim of improving the reconstruction and thereby extracting more information from the rank-order encoded stimulus. We observe that there is an increase of 10 - 15% in the information retrieved from a reconstructed stimulus as a result of inverting the filter-bank.

  5. Mucus can change the permeation rank order of drug candidates

    DEFF Research Database (Denmark)

    Hagesaether, Ellen; Christiansen, Elisabeth; Due-Hansen, Maria Elisabeth

    2013-01-01

    The aim of the study was to test the effect of mucus on the permeability of newly developed structurally related free fatty acid receptor 1-agonists TUG-488, TUG-499 and TUG-424, which were compared to the more hydrophilic ketoprofen and the more hydrophobic testosterone as reference drugs...... out at a lower agitation. These results indicate that an experimental system without mucus can give a faulty rank order of permeation compared to mucous membranes when structurally related drug candidates are tested....... a minor influence. However, for one of the drug candidates, TUG-499, mucus had a clear impact, and this could not be explicitly related to the hydrophobicity of this compound. Secreted mucus thus changed the obtained rank order of permeation. This was especially apparent when the experiments were carried...

  6. Information content of partially rank-ordered set samples

    OpenAIRE

    Hatefi, Armin; Jozani, Mohammad Jafari

    2015-01-01

    Partially rank-ordered set (PROS) sampling is a generalization of ranked set sampling in which rankers are not required to fully rank the sampling units in each set, hence having more flexibility to perform the necessary judgemental ranking process. The PROS sampling has a wide range of applications in different fields ranging from environmental and ecological studies to medical research and it has been shown to be superior over ranked set sampling and simple random sampling for estimating th...

  7. Multifractal methodology

    CERN Document Server

    Salat, Hadrien; Arcaute, Elsa

    2016-01-01

    Various methods have been developed independently to study the multifractality of measures in many different contexts. Although they all convey the same intuitive idea of giving a "dimension" to sets where a quantity scales similarly within a space, they are not necessarily equivalent on a more rigorous level. This review article aims at unifying the multifractal methodology by presenting the multifractal theoretical framework and principal practical methods, namely the moment method, the histogram method, multifractal detrended fluctuation analysis (MDFA) and modulus maxima wavelet transform (MMWT), with a comparative and interpretative eye.

  8. Exact Reconstruction of the Rank Order Coding using Frames Theory

    CERN Document Server

    Masmoudi, Khaled; Kornprobst, Pierre

    2011-01-01

    Our goal is to revisit rank order coding by proposing an original exact decoding procedure for it. Rank order coding was proposed by Simon Thorpe et al. who stated that the retina represents the visual stimulus by the order in which its cells are activated. A classical rank order coder/decoder was then designed on this basis [1]. Though, it appeared that the decoding procedure employed yields reconstruction errors that limit the model Rate/Quality performances when used as an image codec. The attempts made in the literature to overcome this issue are time consuming and alter the coding procedure, or are lacking mathematical support and feasibility for standard size images. Here we solve this problem in an original fashion by using the frames theory, where a frame of a vector space designates an extension for the notion of basis. First, we prove that the analyzing filter bank considered is a frame, and then we define the corresponding dual frame that is necessary for the exact image reconstruction. Second, to ...

  9. Frames for exact inversion of the rank order coder.

    Science.gov (United States)

    Masmoudi, Khaled; Antonini, Marc; Kornprobst, Pierre

    2012-02-01

    Our goal is to revisit rank order coding by proposing an original exact decoding procedure for it. Rank order coding was proposed by Thorpe et al. who stated that the order in which the retina cells are activated encodes for the visual stimulus. Based on this idea, the authors proposed in [1] a rank order coder/decoder associated to a retinal model. Though, it appeared that the decoding procedure employed yields reconstruction errors that limit the model bit-cost/quality performances when used as an image codec. The attempts made in the literature to overcome this issue are time consuming and alter the coding procedure, or are lacking mathematical support and feasibility for standard size images. Here we solve this problem in an original fashion by using the frames theory, where a frame of a vector space designates an extension for the notion of basis. Our contribution is twofold. First, we prove that the analyzing filter bank considered is a frame, and then we define the corresponding dual frame that is necessary for the exact image reconstruction. Second, to deal with the problem of memory overhead, we design a recursive out-of-core blockwise algorithm for the computation of this dual frame. Our work provides a mathematical formalism for the retinal model under study and defines a simple and exact reverse transform for it with over than 265 dB of increase in the peak signal-to-noise ratio quality compared to [1]. Furthermore, the framework presented here can be extended to several models of the visual cortical areas using redundant representations.

  10. A Rank-Ordered Marginal Filter for Deinterlacing

    Directory of Open Access Journals (Sweden)

    Seok Hoon Kang

    2013-03-01

    Full Text Available This paper proposes a new interpolation filter for deinterlacing, which is achievedby enhancing the edge preserving ability of the conventional edge-based line averagemethods. This filter consists of three steps: pre-processing step, fuzzy metric-based weightassignation step, and rank-ordered marginal filter step. The proposed method is able tointerpolate the missing lines without introducing annoying articles. Simulation results showthat the images filtered with the proposed algorithm restrain less annoying pixels than theones acquired by other methods.

  11. Solar system plasma Turbulence: Observations, inteRmittency and Multifractals

    Science.gov (United States)

    Echim, Marius M.

    2016-04-01

    function of the targeted system (solar wind/magnetospheres/geomagnetic indices), solar cycle phase (minimum versus maximum), type of result (PSDs, PDFs, Multifractals). The results catalogues, available online from http://www.storm-fp7.eu, include 4094 PSD spectra, 9566 PDFs and 15633 multifractal spectra (from partition function and respectively Rank Ordered (ROMA) formalisms). These results are obtained at solar maximum (2001-2002, both in the solar wind and the terrestrial magnetosheath) and solar minimum (1997-1998 in the solar wind, 2007-2008 in the solar wind, Venus and Earth magnetosheath and selected regions of the magnetosphere). Research supported by the European Community's Seventh Framework Programme (FP7/2007-2013) under grant agreement no 313038/STORM.

  12. Useful experimental designs and rank order statistics in educational research

    Directory of Open Access Journals (Sweden)

    Zendler, Andreas

    2013-01-01

    Full Text Available Experimental educational research is of great impact because it illuminates cause-and-effect relationships by accumulating empirical evidence. The present article does not propose new methods but brings three useful experimental designs as well as appropriate statistical procedures (rank order statistics to the attention of the reader to conduct educational experiments, even with small samples. By means of their systematic use combined with the process-product paradigm of experimental educational research, the influence of essential variables (teacher, context, and process variables in schools, universities, and other educational institutions can be investigated. The statistical procedures described in this article guarantee that small samples (e.g. a school class can be successfully used, and that product variables (e.g. knowledge, comprehension, transfer are only required to meet the criteria of an ordinal scale. The experimental designs and statistical procedures are exemplified by hypothetical data and detailed calculations.

  13. Measures of galaxy environment -- II. Rank-ordered mark correlations

    CERN Document Server

    Skibba, Ramin A; Croton, Darren J; Muldrew, Stuart I; Abbas, Ummi; Pearce, Frazer R; Shattow, Genevieve M

    2012-01-01

    We analyze environmental correlations using mark clustering statistics with the mock galaxy catalogue constructed by Muldrew et al. (Paper I). We find that mark correlation functions are able to detect even a small dependence of galaxy properties on the environment, quantified by the overdensity $1+\\delta$, while such a small dependence would be difficult to detect by traditional methods. We then show that rank ordering the marks and using the rank as a weight is a simple way of comparing the correlation signals for different marks. With this we quantify to what extent fixed-aperture overdensities are sensitive to large-scale halo environments, nearest-neighbor overdensities are sensitive to small-scale environments within haloes, and colour is a better tracer of overdensity than is luminosity.

  14. A Renormalization-Group Interpretation of the Connection between Criticality and Multifractals

    Science.gov (United States)

    Chang, Tom

    2014-05-01

    Turbulent fluctuations in space plasmas beget phenomena of dynamic complexity. It is known that dynamic renormalization group (DRG) may be employed to understand the concept of forced and/or self-organized criticality (FSOC), which seems to describe certain scaling features of space plasma turbulence. But, it may be argued that dynamic complexity is not just a phenomenon of criticality. It is therefore of interest to inquire if DRG may be employed to study complexity phenomena that are distinctly more complicated than dynamic criticality. Power law scaling generally comes about when the DRG trajectory is attracted to the vicinity of a fixed point in the phase space of the relevant dynamic plasma parameters. What happens if the trajectory lies within a domain influenced by more than one single fixed point or more generally if the transformation underlying the DRG is fully nonlinear? The global invariants of the group under such situations (if they exist) are generally not power laws. Nevertheless, as we shall argue, it may still be possible to talk about local invariants that are power laws with the nonlinearity of transformation prescribing a specific phenomenon as crossovers. It is with such concept in mind that we may provide a connection between the properties of dynamic criticality and multifractals from the point of view of DRG (T. Chang, Chapter VII, "An Introduction to Space Plasma Complexity", Cambridge University Press, 2014). An example in terms of the concepts of finite-size scaling (FSS) and rank-ordered multifractal analysis (ROMA) of a toy model shall be provided. Research partially supported by the US National Science Foundation and the European Community's Seventh Framework Programme (FP7/ 2007-2013) under Grant agreement no. 313038/STORM.

  15. On the Behavior of Journal Impact Factor Rank-Order Distribution

    OpenAIRE

    R. Mansilla; Köppen, E.; Cocho, G.; Miramontes, P.

    2006-01-01

    An empirical law for the rank-order behavior of journal impact factors is found. Using an extensive data base on impact factors including journals on Education, Agrosciences, Geosciences, Biosciences and Environ- mental, Chemical, Computer, Engineering, Material, Mathematical, Medical and Physical Sciences we have found extremely good fits out- performing other rank-order models. Some extensions to other areas of knowledge are discussed.

  16. Roma as the Others

    Science.gov (United States)

    Doubek, David; Levínská, Marketa; Bittnerová, Dana

    2015-01-01

    While it is common to speak about "Roma culture" as a single entity, the questions posed by Roma culture are more complex. We are speaking about the general issues pertaining to various manifestations of this culture in the context of the Czech Republic. It must be stressed that under "Roma," we understand a family resemblance…

  17. Roma as the Others

    Science.gov (United States)

    Doubek, David; Levínská, Marketa; Bittnerová, Dana

    2015-01-01

    While it is common to speak about "Roma culture" as a single entity, the questions posed by Roma culture are more complex. We are speaking about the general issues pertaining to various manifestations of this culture in the context of the Czech Republic. It must be stressed that under "Roma," we understand a family resemblance…

  18. On Multifractal Rigidity

    Energy Technology Data Exchange (ETDEWEB)

    Meson, Alejandro M., E-mail: meson@iflysib.unlp.edu.ar; Vericat, Fernando, E-mail: vericat@iflysib.unlp.edu.ar [CONICET-UNLP, Instituto de Fisica de Liquidos y Sistemas Biologicos (IFLYSIB) (Argentina)

    2011-12-15

    We analyze when a multifractal spectrum can be used to recover the potential. This phenomenon is known as multifractal rigidity. We prove that for a certain class of potentials the multifractal spectrum of local entropies uniquely determines their equilibrium states. This leads to a classification which identifies two systems up to a change of variables.

  19. Factors Affecting Candidate Placement on an Emergency Medicine Residency Program’s Rank Order List

    Directory of Open Access Journals (Sweden)

    Michael J Breyer

    2012-12-01

    Full Text Available Introduction: Several factors influence the final placement of a medical student candidate on an emergency medicine (EM residency program's rank order list, including EM grade, standardized letter of recommendation, medical school class rank, and US Medical License Examination (USMLE scores. We sought to determine the correlation of these parameters with a candidate's final rank on a residency program's rank order list.Methods: We used a retrospective cohort design to examine 129 candidate packets from an EM residency program. Class ranks were assessed according to the instructions provided by the students' medical schools. EM grades were scored from 1 (honors to 5 (fail. Global assessments noted on the standardized letter of recommendation (SLOR were scored from 1 (outstanding to 4 (good. USMLE scores were reported as the candidate's 3-digit scores. Spearman's rank correlation coefficient was used to analyze data.Results: Electronic Residency Application Service packets for 127/129 (98.4% candidates were examined. The following parameters correlated positively with a candidate's final placement on the rank order list: EM grade, p = 0.379, P < 0.001; global assessment, p = 0.332, P < 0.001; and class rank, p = 0.234, P= 0.035. We found a negative correlation between final placement on the rank order list with both USMLE step 1 scores, p = —0.253, P= 0.006; and USMLE step 2 scores, p=-0.348, P= 0.004.Conclusion: Higher scores on EM rotations, medical school class ranks, and SLOR global assessments correlated with higher placements on a rank order list, whereas candidates with higher USMLE scores had lower placements on a rank order list. However, none of the parameters examined correlated strongly with ultimate position of a candidate on the rank list, which underscores that other factors may influence a candidate's final ranking.

  20. School Adaptation of Roma Children

    Science.gov (United States)

    Gerganov, Encho; Varbanova, Silvia; Kyuchukov, Hristo

    2005-01-01

    This paper examines the degree of school adaptation among Roma children who were included in a program for the desegregation of Roma schools in Bulgaria. More specifically, the program requires Roma children to attend mixed classes with Bulgarian students and Roma teacher assistants to work with them. The Bulgarian version of the Questionnaire on…

  1. A Precision-weighted Rank-ordering Procedure for the Combination of Voice Coder Evaluation Results

    NARCIS (Netherlands)

    Tardelli, J.D.; Wijngaarden, S.J. van; Hassanein, H.; Collura, J.S.

    2002-01-01

    A precision-weighted rank-ordering procedure was developed for the combination of voice coder subjective evaluation results to provide a final measure of performance for the reference and candidate coders in the NATO 1200/2400 bps coder selection project. The combination procedure is based on calcul

  2. Rank-order tournaments as incentive devices : evidence from a field experiment

    NARCIS (Netherlands)

    Leuven, E.; Oosterbeek, H.; Sonnemans, J.; van der Klaauw, B.

    2007-01-01

    A vast body of empirical studies lends support to the incentive effects of rank-order tournaments. Direct evidence comes from experiments in laboratories or from non-experimental sports events (golf, tennis). The short duration of the tasks at hand or the lack of distractors may limit the external v

  3. A Parametric Procedure for Ultrametric Tree Estimation from Conditional Rank Order Proximity Data.

    Science.gov (United States)

    Young, Martin R.; DeSarbo, Wayne S.

    1995-01-01

    A new parametric maximum likelihood procedure is proposed for estimating ultrametric trees for the analysis of conditional rank order proximity data. Technical aspects of the model and the estimation algorithm are discussed, and Monte Carlo results illustrate its application. A consumer psychology application is also examined. (SLD)

  4. [Roma populations and health].

    Science.gov (United States)

    Jackson, Y; Tabin, J P; Hourton, G; Bodenmann, P

    2015-03-25

    The health status of the so-called "Roma" is usually much poorer than that of neighbouring non-Roma populations with a life expectancy gap of 5-15 years. This results from prolonged exposure to adverse determinants of health and to persistent exclusion from social and political arenas. Scientific and social research has only poorly addressed the health issues of Roma and evidences are scarce. Insufficient access to public services, including to health care and non optimal clinical practices are modifiable factors. If correctly addressed, this could contribute to reduce health disparities, including in Switzerland.

  5. Knowledge extraction from evolving spiking neural networks with rank order population coding.

    Science.gov (United States)

    Soltic, Snjezana; Kasabov, Nikola

    2010-12-01

    This paper demonstrates how knowledge can be extracted from evolving spiking neural networks with rank order population coding. Knowledge discovery is a very important feature of intelligent systems. Yet, a disproportionally small amount of research is centered on the issue of knowledge extraction from spiking neural networks which are considered to be the third generation of artificial neural networks. The lack of knowledge representation compatibility is becoming a major detriment to end users of these networks. We show that a high-level knowledge can be obtained from evolving spiking neural networks. More specifically, we propose a method for fuzzy rule extraction from an evolving spiking network with rank order population coding. The proposed method was used for knowledge discovery on two benchmark taste recognition problems where the knowledge learnt by an evolving spiking neural network was extracted in the form of zero-order Takagi-Sugeno fuzzy IF-THEN rules.

  6. ROCIT : a visual object recognition algorithm based on a rank-order coding scheme.

    Energy Technology Data Exchange (ETDEWEB)

    Gonzales, Antonio Ignacio; Reeves, Paul C.; Jones, John J.; Farkas, Benjamin D.

    2004-06-01

    This document describes ROCIT, a neural-inspired object recognition algorithm based on a rank-order coding scheme that uses a light-weight neuron model. ROCIT coarsely simulates a subset of the human ventral visual stream from the retina through the inferior temporal cortex. It was designed to provide an extensible baseline from which to improve the fidelity of the ventral stream model and explore the engineering potential of rank order coding with respect to object recognition. This report describes the baseline algorithm, the model's neural network architecture, the theoretical basis for the approach, and reviews the history of similar implementations. Illustrative results are used to clarify algorithm details. A formal benchmark to the 1998 FERET fafc test shows above average performance, which is encouraging. The report concludes with a brief review of potential algorithmic extensions for obtaining scale and rotational invariance.

  7. A VLSI Implementation of Rank-Order Searching Circuit Employing a Time-Domain Technique

    Directory of Open Access Journals (Sweden)

    Trong-Tu Bui

    2013-01-01

    Full Text Available We present a compact and low-power rank-order searching (ROS circuit that can be used for building associative memories and rank-order filters (ROFs by employing time-domain computation and floating-gate MOS techniques. The architecture inherits the accuracy and programmability of digital implementations as well as the compactness and low-power consumption of analog ones. We aim to implement identification function as the first priority objective. Filtering function would be implemented once the location identification function has been carried out. The prototype circuit was designed and fabricated in a 0.18 μm CMOS technology. It consumes only 132.3 μW for an eight-input demonstration case.

  8. A Methodology for Aggregation of Multiple Criteria Rank-Ordered Priorities.

    Science.gov (United States)

    1980-05-01

    application for social choice theory . Certain restrictions were used to select the relevant material from the extensive body of social choice information. These...General Social Choice Theory Overview: As knowledge developed, several comprehensive social choice theory works became available from authors such as...Set Rank Orders a. Background The literature survey for this research disclosed that a new branch of social choice theory has been emerging since 1974

  9. Rank-ordered filter for edge enhancement of cellular images using interval type II fuzzy set.

    Science.gov (United States)

    Chaira, Tamalika

    2015-10-01

    An edge-enhancement technique using an interval type II fuzzy set that uses rank-ordered filter to enhance the edges of cellular images is proposed. When cellular images from any laboratory are digitized, scanned, and stored, some kind of degradation occurs, and directly using a rank-ordered filter may not produce clear edges. These images contain uncertainties, present in edges or boundaries of the image. Fuzzy sets that take into account these uncertainties may be a good tool to process these images. However, a fuzzy set sometimes does not produce better results. We used an interval type II fuzzy set, which considers the uncertainty in a different way. It considers the membership function in the fuzzy set as "fuzzy," so the membership values lie within an interval range. A type II fuzzy set has upper and lower membership levels, and with the two levels, a new membership function is computed using Hamacher t-conorm. A new fuzzy image is formed. A rank-ordered filter is applied to the image to obtain an edge-enhanced image. The proposed method is compared with the existing methods visually and quantitatively using entropic method. Entropy of the proposed method is higher (0.4418) than the morphology method (0.2275), crisp method (0.3599), and Sobel method (0.2669), implying that the proposed method is better.

  10. EDUCATION AND ROMA POPULATION

    Directory of Open Access Journals (Sweden)

    Ana Asensio Belenguer

    2016-07-01

    Full Text Available This article deals with Education and the Roma Population. It presents an approach to schooling of Romani children since its outset in the city of Zaragoza (Spain. It analyzes the current status as presented by the Strategy for Social Inclusion of this people 2012-2020, and collects, from various sources, the fact that education remains a pending challenge for Roma Population. Measures to be taken by the educational community from a gender and inclusive perspective are proposed.

  11. The Roma Education Fund: A New Tool for Roma Inclusion

    Science.gov (United States)

    Marc, Alexandre; Bercus, Costel

    2007-01-01

    In January 2005, the Roma Education Fund (REF) came into existence as a Swiss foundation with the goal of increasing the inclusion of Roma children in mainstream classes in Central and Eastern Europe. The fund gives priority to countries that make a political commitment to design and finance actions to improve Roma living conditions, by taking…

  12. The Roma Education Fund: A New Tool for Roma Inclusion

    Science.gov (United States)

    Marc, Alexandre; Bercus, Costel

    2007-01-01

    In January 2005, the Roma Education Fund (REF) came into existence as a Swiss foundation with the goal of increasing the inclusion of Roma children in mainstream classes in Central and Eastern Europe. The fund gives priority to countries that make a political commitment to design and finance actions to improve Roma living conditions, by taking…

  13. A multiplicative process for generating the rank-order distribution of UK election results

    CERN Document Server

    Fenner, Trevor; Loizou, George

    2016-01-01

    Human dynamics and sociophysics suggest statistical models that may explain and provide us with a better understanding of social phenomena. Here we propose a generative multiplicative decrease model that gives rise to a rank-order distribution and allows us to analyse the results of the last three UK parliamentary elections. We provide empirical evidence that the additive Weibull distribution, which can be generated from our model, is a close fit to the electoral data, offering a novel interpretation of the recent election results.

  14. Linguistic Analysis of the Human Heartbeat Using Frequency and Rank Order Statistics

    Science.gov (United States)

    Yang, Albert C.-C.; Hseu, Shu-Shya; Yien, Huey-Wen; Goldberger, Ary L.; Peng, C.-K.

    2003-03-01

    Complex physiologic signals may carry unique dynamical signatures that are related to their underlying mechanisms. We present a method based on rank order statistics of symbolic sequences to investigate the profile of different types of physiologic dynamics. We apply this method to heart rate fluctuations, the output of a central physiologic control system. The method robustly discriminates patterns generated from healthy and pathologic states, as well as aging. Furthermore, we observe increased randomness in the heartbeat time series with physiologic aging and pathologic states and also uncover nonrandom patterns in the ventricular response to atrial fibrillation.

  15. Multifractals theory and applications

    CERN Document Server

    Harte, David

    2001-01-01

    Although multifractals are rooted in probability, much of the related literature comes from the physics and mathematics arena. Multifractals: Theory and Applications pulls together ideas from both these areas using a language that makes them accessible and useful to statistical scientists. It provides a framework, in particular, for the evaluation of statistical properties of estimates of the Renyi fractal dimensions.The first section provides introductory material and different definitions of a multifractal measure. The author then examines some of the various constructions for describing multifractal measures. Building from the theory of large deviations, he focuses on constructions based on lattice coverings, covering by point-centered spheres, and cascades processes. The final section presents estimators of Renyi dimensions of integer order two and greater and discusses their properties. It also explores various applications of dimension estimation and provides a detailed case study of spatial point patte...

  16. Regularities of Multifractal Measures

    Indian Academy of Sciences (India)

    Hun Ki Baek

    2008-05-01

    First, we prove the decomposition theorem for the regularities of multifractal Hausdorff measure and packing measure in $\\mathbb{R}^d$. This decomposition theorem enables us to split a set into regular and irregular parts, so that we can analyze each separately, and recombine them without affecting density properties. Next, we give some properties related to multifractal Hausdorff and packing densities. Finally, we extend the density theorem in [6] to any measurable set.

  17. Ship detection in satellite imagery using rank-order greyscale hit-or-miss transforms

    Energy Technology Data Exchange (ETDEWEB)

    Harvey, Neal R [Los Alamos National Laboratory; Porter, Reid B [Los Alamos National Laboratory; Theiler, James [Los Alamos National Laboratory

    2010-01-01

    Ship detection from satellite imagery is something that has great utility in various communities. Knowing where ships are and their types provides useful intelligence information. However, detecting and recognizing ships is a difficult problem. Existing techniques suffer from too many false-alarms. We describe approaches we have taken in trying to build ship detection algorithms that have reduced false alarms. Our approach uses a version of the grayscale morphological Hit-or-Miss transform. While this is well known and used in its standard form, we use a version in which we use a rank-order selection for the dilation and erosion parts of the transform, instead of the standard maximum and minimum operators. This provides some slack in the fitting that the algorithm employs and provides a method for tuning the algorithm's performance for particular detection problems. We describe our algorithms, show the effect of the rank-order parameter on the algorithm's performance and illustrate the use of this approach for real ship detection problems with panchromatic satellite imagery.

  18. End-stage renal disease among Roma and non-Roma: Roma are at risk.

    Science.gov (United States)

    Kolvek, Gabriel; Rosicova, Katarina; Rosenberger, Jaroslav; Podracka, Ludmila; Stewart, Roy E; Nagyova, Iveta; Reijneveld, Sijmen A; van Dijk, Jitse P

    2012-08-01

    Ethnic differences in the occurrence of end-stage renal disease (ESRD) are reported on various populations across the world, but evidence on Roma is lacking. The aim of this study was to explore the relative risk (RR) of ESRD for Roma who constitute a major minority in Slovakia. Patients treated by means of hemodialysis during 2005-2008 were questioned for their ethnicity. Rates of ESRD among Roma and non-Roma based on hemodialysis data were calculated as well as the RR of Roma for ESRD. The latter was repeated after standardization for differences in age of both populations. Roma represented 11.6 % of all hemodialyzed patients. The RR of ESRD for Roma was 1.34, compared to the majority population. After age standardization, the RR for Roma was 2.85. This study shows that the risk for ESRD is significantly higher for Roma than for non-Roma. A genetic propensity of Roma to renal failure may partially explain the higher risk. Moreover, a poorer control of risk factors for ESRD in Slovak Roma contributes to the increased risk.

  19. Multifractal approach for seafloor characterization

    Digital Repository Service at National Institute of Oceanography (India)

    Chakraborty, B.; Haris, K.; Latha, G.; Maslov, N.; Menezes, A.A.A.

    to characterize the seafloor. Two distinct multifractal formalisms are applied to determine the characteristics. The first formalism employs data analyses using generalized dimension D(q) and multifractal singularity spectrum f(alpha) linked shape parameters...

  20. Hegemony in the Roma family.

    Science.gov (United States)

    Mrhálek, Tomáš; Lidová, Lenka; Kajanová, Alena

    2015-01-01

    This article is intended to describe the current hegemonic masculinity within the Roma family structure in the Czech Republic, with regard to changes related to developments in the majority society and the current socioeconomic situation of the Roma. The theoretical context of this article is based on the paradigm of masculine hegemony as it exists and has existed in the Roma families. Data for the study came from semi-structured interviews with 30 Roma females and 30 Roma males living as couples, in three Czech cities. The main finding reveals a dichotomy between the traditional roles of Roma women, i.e. care for the family and the household, and the present functions, i.e. contributing to the family income through social benefits. We observed a decline in the traditional role of Roma men, who were often unemployed. We related the change in the roles of men to the "non-functionality of the men", contributing to the emerging potential for emancipation of Roma women. However, the traditional patriarchal Roma family is structured such that men are given the main decision making powers, which has slowed changes in marginalized Roma families. Additionally, social pressures against women as well as socially conditioned pressures that act to preserve hegemonic masculinity, have largely prevented the realization of the potential for emancipation of Roma women, or if a woman tries to leave her non-functioning husband.

  1. Impact of proximity-adjusted preferences on rank-order stability in geographical multicriteria decision analysis

    Science.gov (United States)

    Ligmann-Zielinska, Arika; Jankowski, Piotr

    2012-04-01

    This paper presents a new approach to deriving preferences assigned to evaluation criteria in geographical multicriteria decision analysis. In this approach, the preferences, expressed by numeric weights, are adjusted by distance measures derived from the explicit consideration of a locational structure. The structure is given by locations of decision options and high importance reference objects. The approach is demonstrated on the example of a house selection case study in San Diego, California. The results show that proximity-adjusted preferences for the evaluation criteria can alter significantly the rank order of decision options. Consequently, the explicit modeling of spatial preference variability may be needed in order to better account for decision-maker's preferences.

  2. Cripta Ardeatina, en Roma

    Directory of Open Access Journals (Sweden)

    Aprile, Nello

    1959-12-01

    Full Text Available Entre las obras realizadas en Italia después de la guerra, corresponde a la ordenación de la Cripta Ardeatina, en Roma, el primer lugar entre la arquitectura monumental. Creemos poder afirmar que esta obra quedará en la historia del movimiento italiano moderno como una conquista cierta, que ninguna moda podrá alterar.

  3. Decomposing Multifractal Crossovers

    Science.gov (United States)

    Nagy, Zoltan; Mukli, Peter; Herman, Peter; Eke, Andras

    2017-01-01

    Physiological processes—such as, the brain's resting-state electrical activity or hemodynamic fluctuations—exhibit scale-free temporal structuring. However, impacts common in biological systems such as, noise, multiple signal generators, or filtering by transport function, result in multimodal scaling that cannot be reliably assessed by standard analytical tools that assume unimodal scaling. Here, we present two methods to identify breakpoints or crossovers in multimodal multifractal scaling functions. These methods incorporate the robust iterative fitting approach of the focus-based multifractal formalism (FMF). The first approach (moment-wise scaling range adaptivity) allows for a breakpoint-based adaptive treatment that analyzes segregated scale-invariant ranges. The second method (scaling function decomposition method, SFD) is a crossover-based design aimed at decomposing signal constituents from multimodal scaling functions resulting from signal addition or co-sampling, such as, contamination by uncorrelated fractals. We demonstrated that these methods could handle multimodal, mono- or multifractal, and exact or empirical signals alike. Their precision was numerically characterized on ideal signals, and a robust performance was demonstrated on exemplary empirical signals capturing resting-state brain dynamics by near infrared spectroscopy (NIRS), electroencephalography (EEG), and blood oxygen level-dependent functional magnetic resonance imaging (fMRI-BOLD). The NIRS and fMRI-BOLD low-frequency fluctuations were dominated by a multifractal component over an underlying biologically relevant random noise, thus forming a bimodal signal. The crossover between the EEG signal components was found at the boundary between the δ and θ bands, suggesting an independent generator for the multifractal δ rhythm. The robust implementation of the SFD method should be regarded as essential in the seamless processing of large volumes of bimodal fMRI-BOLD imaging data for

  4. Decomposing Multifractal Crossovers

    Directory of Open Access Journals (Sweden)

    Zoltan Nagy

    2017-07-01

    Full Text Available Physiological processes—such as, the brain's resting-state electrical activity or hemodynamic fluctuations—exhibit scale-free temporal structuring. However, impacts common in biological systems such as, noise, multiple signal generators, or filtering by transport function, result in multimodal scaling that cannot be reliably assessed by standard analytical tools that assume unimodal scaling. Here, we present two methods to identify breakpoints or crossovers in multimodal multifractal scaling functions. These methods incorporate the robust iterative fitting approach of the focus-based multifractal formalism (FMF. The first approach (moment-wise scaling range adaptivity allows for a breakpoint-based adaptive treatment that analyzes segregated scale-invariant ranges. The second method (scaling function decomposition method, SFD is a crossover-based design aimed at decomposing signal constituents from multimodal scaling functions resulting from signal addition or co-sampling, such as, contamination by uncorrelated fractals. We demonstrated that these methods could handle multimodal, mono- or multifractal, and exact or empirical signals alike. Their precision was numerically characterized on ideal signals, and a robust performance was demonstrated on exemplary empirical signals capturing resting-state brain dynamics by near infrared spectroscopy (NIRS, electroencephalography (EEG, and blood oxygen level-dependent functional magnetic resonance imaging (fMRI-BOLD. The NIRS and fMRI-BOLD low-frequency fluctuations were dominated by a multifractal component over an underlying biologically relevant random noise, thus forming a bimodal signal. The crossover between the EEG signal components was found at the boundary between the δ and θ bands, suggesting an independent generator for the multifractal δ rhythm. The robust implementation of the SFD method should be regarded as essential in the seamless processing of large volumes of bimodal f

  5. On VLSI Design of Rank-Order Filtering using DCRAM Architecture.

    Science.gov (United States)

    Lin, Meng-Chun; Dung, Lan-Rong

    2008-02-01

    This paper addresses on VLSI design of rank-order filtering (ROF) with a maskable memory for real-time speech and image processing applications. Based on a generic bit-sliced ROF algorithm, the proposed design uses a special-defined memory, called the dual-cell random-access memory (DCRAM), to realize major operations of ROF: threshold decomposition and polarization. Using the memory-oriented architecture, the proposed ROF processor can benefit from high flexibility, low cost and high speed. The DCRAM can perform the bit-sliced read, partial write, and pipelined processing. The bit-sliced read and partial write are driven by maskable registers. With recursive execution of the bit-slicing read and partial write, the DCRAM can effectively realize ROF in terms of cost and speed. The proposed design has been implemented using TSMC 0.18 μm 1P6M technology. As shown in the result of physical implementation, the core size is 356.1 × 427.7μm(2) and the VLSI implementation of ROF can operate at 256 MHz for 1.8V supply.

  6. Kidney diseases in Roma and non-Roma children from eastern Slovakia: are Roma children more at risk?

    Science.gov (United States)

    Kolvek, Gabriel; Podracka, Ludmila; Rosenberger, Jaroslav; Stewart, Roy E; van Dijk, Jitse P; Reijneveld, Sijmen A

    2014-12-01

    To compare the occurence of primary renal diseases (PRD) in Roma and non-Roma children. Data on all outpatients (n = 921) from a tertiary pediatric nephrology centre (Roma and non-Roma children. The proportion of Roma among patients was relatively small regarding early signs like proteinuria but large regarding PRD with gross clinically apparent symptoms (e.g. Alport syndrome, p Roma children in outpatients with kidney problems is smaller than the estimated proportion of Roma in all children in Slovakia, in particular for early signs, but not for major renal diseases.

  7. ROMA — EDRN Public Portal

    Science.gov (United States)

    The Risk of Ovarian Malignancy Algorithm (ROMA) algorithm was approved by the FDA in 2011. Research demonstrates that examining levels of HE4 and CA125 using the ROMA algorithm shows the highest accuracy in determining ovarian cancer risk in pre- and post-menopausal women who have an ovarian mass present.

  8. Universality of rank-ordering distributions in the arts and sciences.

    Science.gov (United States)

    Martínez-Mekler, Gustavo; Alvarez Martínez, Roberto; Beltrán del Río, Manuel; Mansilla, Ricardo; Miramontes, Pedro; Cocho, Germinal

    2009-01-01

    Searching for generic behaviors has been one of the driving forces leading to a deep understanding and classification of diverse phenomena. Usually a starting point is the development of a phenomenology based on observations. Such is the case for power law distributions encountered in a wealth of situations coming from physics, geophysics, biology, lexicography as well as social and financial networks. This finding is however restricted to a range of values outside of which finite size corrections are often invoked. Here we uncover a universal behavior of the way in which elements of a system are distributed according to their rank with respect to a given property, valid for the full range of values, regardless of whether or not a power law has previously been suggested. We propose a two parameter functional form for these rank-ordered distributions that gives excellent fits to an impressive amount of very diverse phenomena, coming from the arts, social and natural sciences. It is a discrete version of a generalized beta distribution, given by f(r) = A(N+1-r)(b)/r(a), where r is the rank, N its maximum value, A the normalization constant and (a, b) two fitting exponents. Prompted by our genetic sequence observations we present a growth probabilistic model incorporating mutation-duplication features that generates data complying with this distribution. The competition between permanence and change appears to be a relevant, though not necessary feature. Additionally, our observations mainly of social phenomena suggest that a multifactorial quality resulting from the convergence of several heterogeneous underlying processes is an important feature. We also explore the significance of the distribution parameters and their classifying potential. The ubiquity of our findings suggests that there must be a fundamental underlying explanation, most probably of a statistical nature, such as an appropriate central limit theorem formulation.

  9. Universality of rank-ordering distributions in the arts and sciences.

    Directory of Open Access Journals (Sweden)

    Gustavo Martínez-Mekler

    Full Text Available Searching for generic behaviors has been one of the driving forces leading to a deep understanding and classification of diverse phenomena. Usually a starting point is the development of a phenomenology based on observations. Such is the case for power law distributions encountered in a wealth of situations coming from physics, geophysics, biology, lexicography as well as social and financial networks. This finding is however restricted to a range of values outside of which finite size corrections are often invoked. Here we uncover a universal behavior of the way in which elements of a system are distributed according to their rank with respect to a given property, valid for the full range of values, regardless of whether or not a power law has previously been suggested. We propose a two parameter functional form for these rank-ordered distributions that gives excellent fits to an impressive amount of very diverse phenomena, coming from the arts, social and natural sciences. It is a discrete version of a generalized beta distribution, given by f(r = A(N+1-r(b/r(a, where r is the rank, N its maximum value, A the normalization constant and (a, b two fitting exponents. Prompted by our genetic sequence observations we present a growth probabilistic model incorporating mutation-duplication features that generates data complying with this distribution. The competition between permanence and change appears to be a relevant, though not necessary feature. Additionally, our observations mainly of social phenomena suggest that a multifactorial quality resulting from the convergence of several heterogeneous underlying processes is an important feature. We also explore the significance of the distribution parameters and their classifying potential. The ubiquity of our findings suggests that there must be a fundamental underlying explanation, most probably of a statistical nature, such as an appropriate central limit theorem formulation.

  10. Evaluating a Project on Roma Education

    Science.gov (United States)

    Georgiadis, Fokion; Nikolajevic, Dragana; van Driel, Barry

    2011-01-01

    This research note is based on the evaluation of the Comenius project Teacher-IN-SErvice-Training-for-Roma-inclusion ("INSETRom"). The project represented an international effort that was undertaken to bridge the gap between Roma and non-Roma communities and to improve the educational attainment of Roma children in the mainstream…

  11. Evaluating a Project on Roma Education

    Science.gov (United States)

    Georgiadis, Fokion; Nikolajevic, Dragana; van Driel, Barry

    2011-01-01

    This research note is based on the evaluation of the Comenius project Teacher-IN-SErvice-Training-for-Roma-inclusion ("INSETRom"). The project represented an international effort that was undertaken to bridge the gap between Roma and non-Roma communities and to improve the educational attainment of Roma children in the mainstream…

  12. End-stage renal disease among Roma and non-Roma : Roma are at risk

    NARCIS (Netherlands)

    Kolvek, Gabriel; Rosicova, Katarina; Rosenberger, Jaroslav; Podracka, Ludmila; Stewart, Roy E.; Nagyova, Iveta; Reijneveld, Sijmen A.; van Dijk, Jitse P.

    Ethnic differences in the occurrence of end-stage renal disease (ESRD) are reported on various populations across the world, but evidence on Roma is lacking. The aim of this study was to explore the relative risk (RR) of ESRD for Roma who constitute a major minority in Slovakia. Patients treated by

  13. End-stage renal disease among Roma and non-Roma : Roma are at risk

    NARCIS (Netherlands)

    Kolvek, Gabriel; Rosicova, Katarina; Rosenberger, Jaroslav; Podracka, Ludmila; Stewart, Roy E.; Nagyova, Iveta; Reijneveld, Sijmen A.; van Dijk, Jitse P.

    2012-01-01

    Ethnic differences in the occurrence of end-stage renal disease (ESRD) are reported on various populations across the world, but evidence on Roma is lacking. The aim of this study was to explore the relative risk (RR) of ESRD for Roma who constitute a major minority in Slovakia. Patients treated by

  14. Computational approach to multifractal music

    CERN Document Server

    Oświęcimka, Paweł; Celińska, Iwona; Drożdż, Stanisław; Rak, Rafał

    2011-01-01

    In this work we perform a fractal analysis of 160 pieces of music belonging to six different genres. We show that the majority of the pieces reveal characteristics that allow us to classify them as physical processes called the 1/f (pink) noise. However, this is not true for classical music represented here by Frederic Chopin's works and for some jazz pieces that are much more correlated than the pink noise. We also perform a multifractal (MFDFA) analysis of these music pieces. We show that all the pieces reveal multifractal properties. The richest multifractal structures are observed for pop and rock music. Also the viariably of multifractal features is best visible for popular music genres. This can suggest that, from the multifractal perspective, classical and jazz music is much more uniform than pieces of the most popular genres of music.

  15. Multifractal characterization of gold market: A multifractal detrended fluctuation analysis

    Science.gov (United States)

    Mali, Provash; Mukhopadhyay, Amitabha

    2014-11-01

    The multifractal detrended fluctuation analysis technique is employed to analyze the time series of gold consumer price index (CPI) and the market trend of three world’s highest gold consuming countries, namely China, India and Turkey for the period: 1993-July 2013. Various multifractal variables, such as the generalized Hurst exponent, the multifractal exponent and the singularity spectrum, are calculated and the results are fitted to the generalized binomial multifractal (GBM) series that consists of only two parameters. Special emphasis is given to identify the possible source(s) of multifractality in these series. Our analysis shows that the CPI series and all three market series are of multifractal nature. The origin of multifractality for the CPI time series and Indian market series is found due to a long-range time correlation, whereas it is mostly due to the fat-tailed probability distributions of the values for the Chinese and Turkey markets. The GBM model series more or less describes all the time series analyzed here.

  16. Fractal and Multifractal Time Series

    CERN Document Server

    Kantelhardt, Jan W

    2008-01-01

    Data series generated by complex systems exhibit fluctuations on many time scales and/or broad distributions of the values. In both equilibrium and non-equilibrium situations, the natural fluctuations are often found to follow a scaling relation over several orders of magnitude, allowing for a characterisation of the data and the generating complex system by fractal (or multifractal) scaling exponents. In addition, fractal and multifractal approaches can be used for modelling time series and deriving predictions regarding extreme events. This review article describes and exemplifies several methods originating from Statistical Physics and Applied Mathematics, which have been used for fractal and multifractal time series analysis.

  17. Multifractal Value at Risk model

    Science.gov (United States)

    Lee, Hojin; Song, Jae Wook; Chang, Woojin

    2016-06-01

    In this paper new Value at Risk (VaR) model is proposed and investigated. We consider the multifractal property of financial time series and develop a multifractal Value at Risk (MFVaR). MFVaR introduced in this paper is analytically tractable and not based on simulation. Empirical study showed that MFVaR can provide the more stable and accurate forecasting performance in volatile financial markets where large loss can be incurred. This implies that our multifractal VaR works well for the risk measurement of extreme credit events.

  18. Being Roma--Being Greek: Academically Successful Greek Romas' Identity Constructions

    Science.gov (United States)

    Gkofa, Panagiota

    2017-01-01

    In Greece, Roma ethnic-cultural identity is frequently situated in a social narrative which "others" this community. As a consequence, Roma pupils' low achievement is frequently understood on the basis of a deficit view of Roma culture because schooling and Roma traditions are widely seen as incompatible. This article theorises aspects…

  19. Kidney diseases in Roma and non-Roma children from eastern Slovakia : are Roma children more at risk?

    NARCIS (Netherlands)

    Kolvek, Gabriel; Podracka, Ludmila; Rosenberger, Jaroslav; Stewart, Roy E.; van Dijk, Jitse P.; Reijneveld, Sijmen A.

    2014-01-01

    OBJECTIVES: To compare the occurence of primary renal diseases (PRD) in Roma and non-Roma children. METHODS: Data on all outpatients (n = 921) from a tertiary pediatric nephrology centre (<19 years) in eastern Slovakia were collected. We assessed early signs and symptoms and PRD for Roma and

  20. Kidney diseases in Roma and non-Roma children from eastern Slovakia : are Roma children more at risk?

    NARCIS (Netherlands)

    Kolvek, Gabriel; Podracka, Ludmila; Rosenberger, Jaroslav; Stewart, Roy E.; van Dijk, Jitse P.; Reijneveld, Sijmen A.

    2014-01-01

    OBJECTIVES: To compare the occurence of primary renal diseases (PRD) in Roma and non-Roma children. METHODS: Data on all outpatients (n = 921) from a tertiary pediatric nephrology centre (<19 years) in eastern Slovakia were collected. We assessed early signs and symptoms and PRD for Roma and non-Rom

  1. Mental health disparities between Roma and non-Roma children in Romania and Bulgaria

    OpenAIRE

    Lee, Eric J.; Keyes, Katherine; Bitfoi, Adina; Mihova, Zlatka; Pez, Ondine; Yoon, Elisha; Masfety, Viviane Kovess

    2014-01-01

    Background The Roma population, one of the largest minority groups in Europe, experience discrimination and stigma associated with marginalized social position. Few studies have examined mental illnesses in the Roma, and none have examined the Roma children. The present study estimates mental health and behavioral disorders among Roma children in comparison to non-Roma children in educational institutions. Methods Data were drawn from the School Children Mental Health Study in Europe (SCHME) ...

  2. Entropy Function for Multifractal Thermodynamics

    Institute of Scientific and Technical Information of China (English)

    QiuhuaZENG

    1999-01-01

    The theory on multifractal thermodynamics has been studied by the method of series expansion.The method is able to overcome the shortages of Kohmoto's steepest desent method and the results have general meanings.

  3. Multifractality and heart rate variability

    Science.gov (United States)

    Sassi, Roberto; Signorini, Maria Gabriella; Cerutti, Sergio

    2009-06-01

    In this paper, we participate to the discussion set forth by the editor of Chaos for the controversy, "Is the normal heart rate chaotic?" Our objective was to debate the question, "Is there some more appropriate term to characterize the heart rate variability (HRV) fluctuations?" We focused on the ≈24 h RR series prepared for this topic and tried to verify with two different techniques, generalized structure functions and wavelet transform modulus maxima, if they might be described as being multifractal. For normal and congestive heart failure subjects, the hq exponents showed to be decreasing for increasing q with both methods, as it should be for multifractal signals. We then built 40 surrogate series to further verify such hypothesis. For most of the series (≈75%-80% of cases) multifractality stood the test of the surrogate data employed. On the other hand, series coming from patients in atrial fibrillation showed a small, if any, degree of multifractality. The population analyzed is too small for definite conclusions, but the study supports the use of multifractal series to model HRV. Also it suggests that the regulatory action of autonomous nervous system might play a role in the observed multifractality.

  4. Multifractal characterization of energy stocks in China: A multifractal detrended fluctuation analysis

    Science.gov (United States)

    Yang, Liansheng; Zhu, Yingming; Wang, Yudong

    2016-06-01

    In this paper, we investigate the impacts of oil price changes on energy stocks in Chinese stock market from the multifractal perspective. The well-known multifractal detrended fluctuation analysis (MF-DFA) is applied to detect the multifractality. We find that both returns and volatilities of energy industry index display apparent multifractal behavior. Oil market activity is an important source of multifractality in energy stocks index in addition to long-range correlations and fat-tail distributions.

  5. Multifractal analysis and simulation of multifractal random walks

    Science.gov (United States)

    Schmitt, Francois G.; Huang, Yongxiang

    2016-04-01

    Multifractal time series, characterized by a scale invariance and large fluctuations at all scales, are found in many fields of natural and applied sciences. They are found i.e. in many geophysical fields, such as atmospheric and oceanic turbulence, hydrology, earth sciences. Here we consider a quite general type of multifractal time series, called multifractal random walk, as non stationary stochastic processes with intermittent stationary increments. We first quickly recall how such time series can be analyzed and characterized, using structure functions and arbitrary order Hilbert spectral analysis. We then discuss the simulation approach. The main object is to provide a stochastic process generating time series having the same multiscale properties We review recent works on this topic, and provide stochastic simulations in order to verify the theoretical predictions. In the lognormal framework we provide a h - μ plane expressing the scale invariant properties of these simulations. The theoretical plane is compared to simulation results.

  6. Smoking behaviour and attitudes of Hungarian Roma and non-Roma population towards tobacco control policies.

    Science.gov (United States)

    Paulik, Edit; Nagymajtényi, László; Easterling, Douglas; Rogers, Todd

    2011-10-01

    To assess the smoking status and support for tobacco control policies among the Roma minority compared with the non-Roma population in Hungary. A cross-sectional survey was delivered among Roma minority and local non-Roma population; 83 Roma and 126 non-Roma people were interviewed. Chi-square tests and logistic regression were applied to compare Roma and non-Roma populations. The prevalence of smoking was significantly higher and the support for tobacco control measures was significantly lower in the Roma population. This effect of ethnicity on attitudes toward tobacco control was explained somewhat, but not completely, by the Roma group's higher rate of smoking and lower level of education. Tobacco control policies are a proven strategy for denormalizing smoking and discouraging initiation. This strategy has important potential for Roma communities because of their high rates of tobacco use. However, this study shows that the Roma are resistant the efforts to limit smoking. Changing these attitudes will require targeted public health interventions that take into account not only the lower educational levels of the Roma, but also their cultural beliefs regarding tobacco.

  7. Reclaiming Roma Students in Hungary

    Science.gov (United States)

    Gruber, Andrea

    2012-01-01

    For most, being served in a restaurant, treated nicely at a job interview, smiled at in the street, or being able to work is nothing out of the ordinary. Sadly, it is not the case for many. Especially for those who are poor. Especially for those who have little education. Especially for those who are Roma (or in other words Gypsy) living in…

  8. Reclaiming Roma Students in Hungary

    Science.gov (United States)

    Gruber, Andrea

    2012-01-01

    For most, being served in a restaurant, treated nicely at a job interview, smiled at in the street, or being able to work is nothing out of the ordinary. Sadly, it is not the case for many. Especially for those who are poor. Especially for those who have little education. Especially for those who are Roma (or in other words Gypsy) living in…

  9. Weyl and Riemann-Liouville multifractional Ornstein-Uhlenbeck processes

    Energy Technology Data Exchange (ETDEWEB)

    Lim, S C [Faculty of Engineering, Multimedia University, Jalan Multimedia, Cyberjaya 63100, Selangor Darul Ehsan (Malaysia); Teo, L P [Faculty of Information Technology, Multimedia University, Jalan Multimedia, Cyberjaya, 63100, Selangor Darul Ehsan (Malaysia)

    2007-06-08

    This paper considers two new multifractional stochastic processes, namely the Weyl multifractional Ornstein-Uhlenbeck process and the Riemann-Liouville multifractional Ornstein-Uhlenbeck process. Basic properties of these processes such as locally self-similar property and Hausdorff dimension are studied. The relationship between the multifractional Ornstein-Uhlenbeck processes and the corresponding multifractional Brownian motions is established.

  10. Understanding the multifractality in portfolio excess returns

    Science.gov (United States)

    Chen, Cheng; Wang, Yudong

    2017-01-01

    The multifractality in stock returns have been investigated extensively. However, whether the autocorrelations in portfolio returns are multifractal have not been considered in the literature. In this paper, we detect multifractal behavior of returns of portfolios constructed based on two popular trading rules, size and book-to-market (BM) ratio. Using the multifractal detrended fluctuation analysis, we find that the portfolio returns are significantly multifractal and the multifractality is mainly attributed to long-range dependence. We also investigate the multifractal cross-correlation between portfolio return and market average return using the detrended cross-correlation analysis. Our results show that the cross-correlations of small fluctuations are persistent, while those of large fluctuations are anti-persistent.

  11. Personality traits in old age: measurement and rank-order stability and some mean-level change.

    Science.gov (United States)

    Mõttus, René; Johnson, Wendy; Deary, Ian J

    2012-03-01

    Lothian Birth Cohorts, 1936 and 1921 were used to study the longitudinal comparability of Five-Factor Model (McCrae & John, 1992) personality traits from ages 69 to 72 years and from ages 81 to 87 years, and cross-cohort comparability between ages 69 and 81 years. Personality was measured using the 50-item International Personality Item Pool (Goldberg, 1999). Satisfactory measurement invariance was established across time and cohorts. High rank-order stability was observed in both cohorts. Almost no mean-level change was observed in the younger cohort, whereas Extraversion, Agreeableness, Conscientiousness, and Intellect declined significantly in the older cohort. The older cohort scored higher on Agreeableness and Conscientiousness. In these cohorts, individual differences in personality traits continued to be stable even in very old age, mean-level changes accelerated.

  12. Immigration of Roma from Republic of Serbia

    Directory of Open Access Journals (Sweden)

    Tatjana Vukelić

    2013-02-01

    Full Text Available The questions of immigration are topics of high interest for the contemporary migration studies. Particularly relevant for the Western European countries is the immigration of Roma. This study analyzes the case of Roma asylum-seekers from Republic of Serbia to Federal Republic of Germany, which assumed a new dimension following the visa liberation. Focus of this article are the links among the social, economical, transitional and political conditions of Roma asylum-seeking, as well as an analysis of potential networks and knowledge transfer among Roma. In particular is to be understand if there is any transnational networking between Roma in home countries and abroad as well if Roma asylum-seekers have to be seen as perpetrators or rather victims of the political occurrences in the concerning country.

  13. Social support, hopelessness and life satisfaction among Roma and non-Roma adolescents in Slovakia

    NARCIS (Netherlands)

    Kolarcik, P.; Geckova, A. Madarasova; Reijneveld, S. A.; van Dijk, J. P.

    2012-01-01

    Evidence on the psychosocial determinants of health among Roma adolescents is completely lacking. Our aim was to compare social support, life satisfaction and hopelessness of Slovak Roma and non-Roma adolescents and to assess the impact of parental education and social desirability on these differen

  14. Anxiety and sense of coherence in Roma and non-Roma coronary heart disease patients

    NARCIS (Netherlands)

    Silarova, Barbora; Nagyova, Iveta; van Dijk, Jitse P.; Rosenberger, Jaroslav; Reijneveld, Sijmen A.

    2014-01-01

    Objective. Morbidity and mortality among Roma due to coronary heart disease (CHD) is high, but evidence on potential psychosocial pathways is lacking. This study aimed to assess the differences in the severity of anxiety symptoms and in the sense of coherence (SOC) between Roma and non-Roma CHD

  15. Social support, hopelessness and life satisfaction among Roma and non-Roma adolescents in Slovakia

    NARCIS (Netherlands)

    Kolarcik, P.; Geckova, A. Madarasova; Reijneveld, S. A.; van Dijk, J. P.

    2012-01-01

    Evidence on the psychosocial determinants of health among Roma adolescents is completely lacking. Our aim was to compare social support, life satisfaction and hopelessness of Slovak Roma and non-Roma adolescents and to assess the impact of parental education and social desirability on these

  16. Multifractal analyses of music sequences

    Science.gov (United States)

    Su, Zhi-Yuan; Wu, Tzuyin

    2006-09-01

    Multifractal analysis is applied to study the fractal property of music. In this paper, a method is proposed to transform both the melody and rhythm of a music piece into individual sets of distributed points along a one-dimensional line. The structure of the musical composition is thus manifested and characterized by the local clustering pattern of these sequences of points. Specifically, the local Hölder exponent and the multifractal spectrum are calculated for the transformed music sequences according to the multifractal formalism. The observed fluctuations of the Hölder exponent along the music sequences confirm the non-uniformity feature in the structures of melodic and rhythmic motions of music. Our present result suggests that the shape and opening width of the multifractal spectrum plot can be used to distinguish different styles of music. In addition, a characteristic curve is constructed by mapping the point sequences converted from the melody and rhythm of a musical work into a two-dimensional graph. Each different pieces of music has its own unique characteristic curve. This characteristic curve, which also exhibits a fractal trait, unveils the intrinsic structure of music.

  17. Social support, hopelessness and life satisfaction among Roma and non-Roma adolescents in Slovakia

    OpenAIRE

    Kolarcik, P.; Geckova, A. Madarasova; Reijneveld, S. A.; van Dijk, J.P.

    2012-01-01

    Evidence on the psychosocial determinants of health among Roma adolescents is completely lacking. Our aim was to compare social support, life satisfaction and hopelessness of Slovak Roma and non-Roma adolescents and to assess the impact of parental education and social desirability on these differences. We conducted a cross-sectional study among Roma from settlements in the eastern part of Slovakia (N = 330; mean age = 14.50; interview) and non-Roma adolescents (N = 722; mean age = 14.86; que...

  18. Health and Education in Roma Families. Comparative Study, Romanian Roma Families from Rennes, France vs. Roma from Mironu, Suceava, Romania

    Directory of Open Access Journals (Sweden)

    Lucheş Daniel

    2016-06-01

    Full Text Available The lower level of education for health and school education among vulnerable groups from Romania is an important part of the vicious circle of poverty and social removal, in particular for Roma minority. The quality of education and health related to this minority group is correlated with cultural aspects and the Roma attitude toward those determinants factors.

  19. Using rank-order geostatistics for spatial interpolation of highly skewed data in a heavy-metal contaminated site.

    Science.gov (United States)

    Juang, K W; Lee, D Y; Ellsworth, T R

    2001-01-01

    The spatial distribution of a pollutant in contaminated soils is usually highly skewed. As a result, the sample variogram often differs considerably from its regional counterpart and the geostatistical interpolation is hindered. In this study, rank-order geostatistics with standardized rank transformation was used for the spatial interpolation of pollutants with a highly skewed distribution in contaminated soils when commonly used nonlinear methods, such as logarithmic and normal-scored transformations, are not suitable. A real data set of soil Cd concentrations with great variation and high skewness in a contaminated site of Taiwan was used for illustration. The spatial dependence of ranks transformed from Cd concentrations was identified and kriging estimation was readily performed in the standardized-rank space. The estimated standardized rank was back-transformed into the concentration space using the middle point model within a standardized-rank interval of the empirical distribution function (EDF). The spatial distribution of Cd concentrations was then obtained. The probability of Cd concentration being higher than a given cutoff value also can be estimated by using the estimated distribution of standardized ranks. The contour maps of Cd concentrations and the probabilities of Cd concentrations being higher than the cutoff value can be simultaneously used for delineation of hazardous areas of contaminated soils.

  20. Bootstrap rank-ordered conditional mutual information (broCMI): A nonlinear input variable selection method for water resources modeling

    Science.gov (United States)

    Quilty, John; Adamowski, Jan; Khalil, Bahaa; Rathinasamy, Maheswaran

    2016-03-01

    The input variable selection problem has recently garnered much interest in the time series modeling community, especially within water resources applications, demonstrating that information theoretic (nonlinear)-based input variable selection algorithms such as partial mutual information (PMI) selection (PMIS) provide an improved representation of the modeled process when compared to linear alternatives such as partial correlation input selection (PCIS). PMIS is a popular algorithm for water resources modeling problems considering nonlinear input variable selection; however, this method requires the specification of two nonlinear regression models, each with parametric settings that greatly influence the selected input variables. Other attempts to develop input variable selection methods using conditional mutual information (CMI) (an analog to PMI) have been formulated under different parametric pretenses such as k nearest-neighbor (KNN) statistics or kernel density estimates (KDE). In this paper, we introduce a new input variable selection method based on CMI that uses a nonparametric multivariate continuous probability estimator based on Edgeworth approximations (EA). We improve the EA method by considering the uncertainty in the input variable selection procedure by introducing a bootstrap resampling procedure that uses rank statistics to order the selected input sets; we name our proposed method bootstrap rank-ordered CMI (broCMI). We demonstrate the superior performance of broCMI when compared to CMI-based alternatives (EA, KDE, and KNN), PMIS, and PCIS input variable selection algorithms on a set of seven synthetic test problems and a real-world urban water demand (UWD) forecasting experiment in Ottawa, Canada.

  1. A combination turbidity and supernatant microplate assay to rank-order the supersaturation limits of early drug candidates.

    Science.gov (United States)

    Morrison, John S; Nophsker, Michelle J; Haskell, Roy J

    2014-10-01

    A unique opportunity exists at the drug discovery stage to overcome inherently poor solubility by selecting drug candidates with superior supersaturation propensity. Existing supersaturation assays compare either precipitation-resistant or precipitation-inhibiting excipients, or higher-energy polymorphic forms, but not multiple compounds or multiple concentrations. Furthermore, these assays lack sufficient throughput and compound conservation necessary for implementation in the discovery environment. A microplate-based combination turbidity and supernatant concentration assay was therefore developed to determine the extent to which different compounds remain in solution as a function of applied concentration in biorelevant media over a specific period of time. Dimethyl sulfoxide stock solutions at multiple concentrations of four poorly soluble, weak base compounds (Dipyridamole, Ketoconazole, Albendazole, and Cinnarizine) were diluted with pH 6.5 buffer as well as FaSSIF. All samples were monitored for precipitation by turbidity at 600 nm over 1 h and the final supernatant concentrations were measured. The maximum supersaturation ratio was calculated from the supersaturation limit and the equilibrium solubility in each media. Compounds were rank-ordered by supersaturation ratio: Ketoconazole > Dipyridamole > Cinnarizine ∼ Albendazole. These in vitro results correlated well with oral AUC ratios from published in vivo pH effect studies, thereby confirming the validity of this approach. © 2014 Wiley Periodicals, Inc. and the American Pharmacists Association.

  2. Revisiting the multifractality in stock returns and its modeling implications

    Science.gov (United States)

    He, Shanshan; Wang, Yudong

    2017-02-01

    In this paper, we investigate the multifractality of Chinese and the U.S. stock markets using a multifractal detrending moving average algorithm. The results show that stock returns in both markets are multifractal at a similar extent. We detect the source of multifractality and find that long-range correlations are one of the major sources of multifractality in the US market but not in the Chinese market. Fat-tailed distribution plays a crucial role in multifractality of both markets. As an innovation, we quantify the effect of extreme events on multifractality and find the strong evidence of their contribution to multifractality. Furthermore, we investigate the usefulness of popular ARFIMA-GARCH models with skew-t distribution in capturing multifractality. Our results indicate that these models can capture only a fraction of multifractality. More complex models do not necessarily perform better than simple GARCH models in describing multifractality in stock returns.

  3. Roma Pupils' Attitudes Towards Education--A Case Study

    Science.gov (United States)

    Pecek, Mojca; Munda, Milanka

    2015-01-01

    When analysing the reasons behind the academic underachievement of Roma pupils, some teachers suggest that Roma people do not value education and that Roma children have negative attitudes towards school. With increasing frequency, Roma pupils from low socio-economic backgrounds are being researched and the research primarily adopts the…

  4. Roma Girls: Between Traditional Values and Educational Aspirations

    Science.gov (United States)

    Kyuchukov, Hristo

    2011-01-01

    The paper presents findings from a survey of 720 respondents: 240 Roma parents, 240 Roma boys and 240 Roma girls between 12 and 25 years of age. The subjects were from various regions of Bulgaria and were members of different ethnic groups. The main goal of the survey was to study the current attitudes that Roma communities hold regarding an…

  5. The Roma Students' Perception of the Importance of Education

    Science.gov (United States)

    Lapat, Goran; Slezak, Hrvoje

    2011-01-01

    The paper considers the effects of Roma education in Medjimurje County. Although the positive effects are present in many different aspects related to education of Roma, among the most important is the change in Roma attitude toward their own education. The comprehension of importance of Roma children's education and intention to base their future…

  6. Roma Girls: Between Traditional Values and Educational Aspirations

    Science.gov (United States)

    Kyuchukov, Hristo

    2011-01-01

    The paper presents findings from a survey of 720 respondents: 240 Roma parents, 240 Roma boys and 240 Roma girls between 12 and 25 years of age. The subjects were from various regions of Bulgaria and were members of different ethnic groups. The main goal of the survey was to study the current attitudes that Roma communities hold regarding an…

  7. Roma Pupils' Attitudes Towards Education--A Case Study

    Science.gov (United States)

    Pecek, Mojca; Munda, Milanka

    2015-01-01

    When analysing the reasons behind the academic underachievement of Roma pupils, some teachers suggest that Roma people do not value education and that Roma children have negative attitudes towards school. With increasing frequency, Roma pupils from low socio-economic backgrounds are being researched and the research primarily adopts the…

  8. Body mass index in Serbian Roma.

    Science.gov (United States)

    Gallagher, Andrew; Cvorović, Jelena; Strkalj, Goran

    2009-01-01

    Stature and body mass were measured in 346 individuals belonging to three Roma groups from metropolitan Belgrade western Serbia. As with the majority of Serbian Roma, the participants in this study have been historically disadvantaged and their situation was further aggravated during the recent political crises. Surprisingly, the body mass index (BMI) of Serbian Roma is relatively high compared with western Europeans and is inconsistent with the view that Serbian Roma are predisposed to high rates of chronic energy deficiency ( approximately 4%). While the majority of individual Roma display BMI values within the normal range (WHO, 1995), certain groups have a moderate to high proportion of individuals ( approximately 35%) who could be classified as overweight and some who approach at-risk levels for clinical obesity.

  9. Representation and Visibility. Roma in the Media

    Directory of Open Access Journals (Sweden)

    Magdalena Ratajczak

    2011-12-01

    Full Text Available This article is divided into three main parts. The first is an overview of the situation of the Roma minorities in Slovenia and Poland. The second part of the article presents minority broadcast media and the main elements of the legal and institutional framework they operate in. Finally, this article focuses on the visibility of Roma in the media. This article draws attention to cultural pluralism and how cultural pluralism is implemented by the public service broadcasters in Poland and Slovenia, particularly in the context of the presence of Roma minorities in the media. The research is based on 15 interviews carried out in Slovenia and Poland between 2006-2009 with journalists, editors, researchers, workers of NGOs, government representatives and Roma minority leaders. This study is also based on policy documents, reports of governments, NGOs and international organisations, academic literature and content analysis of Roma minority media.

  10. Seven years' mortality in Roma and non-Roma patients after coronary angiography.

    Science.gov (United States)

    Sudzinova, Adriana; Nagyova, Iveta; Rosenberger, Jaroslav; Studencan, Martin; Vargova, Helena; Middel, Berrie; van Dijk, Jitse P; Reijneveld, Sijmen A

    2015-10-01

    Ethnicity is associated with differences in clinical course and outcomes of cardiac disease, often in association with a poorer socioeconomic position. The aim of this study was to compare the mortality after coronary angiography (CAG) of Roma and non-Roma patients matched for education and adjusted for gender and age. In total, 816 patients were included in the study (167 Roma and 649 non-Roma). Data on socio-demographic background, disease history, use of drugs, coronary findings and type of treatment were obtained from medical records. Mortality was assessed up to seven years after CAG. Kaplan-Meier curves of mortality were plotted, and differences between the Roma and non-Roma patients were assessed using log-rank tests, matched for education and adjusted for gender and age. Mortality after CAG was significantly higher among Roma than non-Roma (log-rank test χ(2) = 7.59, P Roma, and this is not due to differences in age, gender or education. These results warrant further reconsideration of the management of Roma cardiac patients. © The Author 2015. Published by Oxford University Press on behalf of the European Public Health Association. All rights reserved.

  11. Comparison of weight and length at birth of non-Roma and Roma newborn in Serbia.

    Science.gov (United States)

    Stanković, Sandra; Živić, Saša; Ignjatović, Aleksandra; Stojanović, Mariola; Bogdanović, Dragan; Novak, Sonja; Vučić, Jelena; Stanković, Miodrag; Šaranac, Ljiljana; Vesna, Cvetković; Miljković, Predrag; Vorgučin, Ivana

    2016-01-01

    Roma infants tend to be smaller and are diagnosed as SGA more often than non-Roma infants, suggesting that specific anthropometric norms for these infants may be useful. We aimed to construct population-based centile, gender-specific charts for birth weight and length for singleton Roma infants born from 35 to 42 weeks of gestation and to compare it with anthropometric data of non-Roma infants. We analyzed data on 27,602 non-Roma (53 % males) and 2235 Roma (51 % males) singleton live infants delivered from 2006 to 2012 in South East Serbia. The LMS method was used to estimate the birth weight and length centiles. Roma infants were up to 12 % lighter and up to 4 % shorter than non-Roma infants. Estimated centile charts for Roma males and females were constructed showing the 3rd, 10th, 25th, 50th, 75th, 90th and 97th centiles. We created the separate centile charts for Roma ethnic group. The sample size was sufficient to demonstrate differences in mean birth weights and lengths of at term infants born during the study period.

  12. Multifractality of stock markets based on cumulative distribution function and multiscale multifractal analysis

    Science.gov (United States)

    Lin, Aijing; Shang, Pengjian

    2016-04-01

    Considering the diverse application of multifractal techniques in natural scientific disciplines, this work underscores the versatility of multiscale multifractal detrended fluctuation analysis (MMA) method to investigate artificial and real-world data sets. The modified MMA method based on cumulative distribution function is proposed with the objective of quantifying the scaling exponent and multifractality of nonstationary time series. It is demonstrated that our approach can provide a more stable and faithful description of multifractal properties in comprehensive range rather than fixing the window length and slide length. Our analyzes based on CDF-MMA method reveal significant differences in the multifractal characteristics in the temporal dynamics between US and Chinese stock markets, suggesting that these two stock markets might be regulated by very different mechanism. The CDF-MMA method is important for evidencing the stable and fine structure of multiscale and multifractal scaling behaviors and can be useful to deepen and broaden our understanding of scaling exponents and multifractal characteristics.

  13. Lorentz violations in multifractal spacetimes

    CERN Document Server

    Calcagni, Gianluca

    2016-01-01

    Using the recent observation of gravitational waves (GW) produced by a black-hole merger, we place a lower bound on the energy above which a multifractal spacetime would manifest an anomalous geometry and, in particular, violations of Lorentz invariance. In the so-called multifractional theory with $q$-derivatives, we show that the deformation of dispersion relations is much stronger than in generic quantum-gravity approaches (including loop quantum gravity) and, contrary to the latter, present observations on GWs can place very strong bounds on the characteristic scales at which spacetime deviates from standard Minkowski. The energy at which multifractal effects should become apparent is $E_*>10^{14}\\,\\text{GeV}$ (thus improving previous bounds by 12 orders of magnitude) when the exponents in the measure are fixed to their central value $1/2$. We also estimate, for the first time, the effect of logarithmic oscillations in the measure (corresponding to a discrete spacetime structure) and find that they do not...

  14. Lorentz violations in multifractal spacetimes

    Energy Technology Data Exchange (ETDEWEB)

    Calcagni, Gianluca [Instituto de Estructura de la Materia, CSIC, Madrid (Spain)

    2017-05-15

    Using the recent observation of gravitational waves (GW) produced by a black-hole merger, we place a lower bound on the energy above which a multifractal spacetime would display an anomalous geometry and, in particular, violations of Lorentz invariance. In the so-called multifractional theory with q-derivatives, we show that the deformation of dispersion relations is much stronger than in generic quantum-gravity approaches (including loop quantum gravity) and, contrary to the latter, present observations on GWs can place very strong bounds on the characteristic scales at which spacetime deviates from standard Minkowski. The energy at which multifractal effects should become apparent is E{sub *} > 10{sup 14} GeV (thus improving previous bounds by 12 orders of magnitude) when the exponents in the measure are fixed to their central value 1 / 2. We also estimate, for the first time, the effect of logarithmic oscillations in the measure (corresponding to a discrete spacetime structure) and find that they do not change much the bounds obtained in their absence, unless the amplitude of the oscillations is fine tuned. This feature, unavailable in known quantum-gravity scenarios, may help the theory to avoid being ruled out by gamma-ray burst (GRB) observations, for which E{sub *} > 10{sup 17} GeV or greater. (orig.)

  15. Lorentz violations in multifractal spacetimes

    Science.gov (United States)

    Calcagni, Gianluca

    2017-05-01

    Using the recent observation of gravitational waves (GW) produced by a black-hole merger, we place a lower bound on the energy above which a multifractal spacetime would display an anomalous geometry and, in particular, violations of Lorentz invariance. In the so-called multifractional theory with q-derivatives, we show that the deformation of dispersion relations is much stronger than in generic quantum-gravity approaches (including loop quantum gravity) and, contrary to the latter, present observations on GWs can place very strong bounds on the characteristic scales at which spacetime deviates from standard Minkowski. The energy at which multifractal effects should become apparent is E_{*}>10^{14} {GeV} (thus improving previous bounds by 12 orders of magnitude) when the exponents in the measure are fixed to their central value 1 / 2. We also estimate, for the first time, the effect of logarithmic oscillations in the measure (corresponding to a discrete spacetime structure) and find that they do not change much the bounds obtained in their absence, unless the amplitude of the oscillations is fine tuned. This feature, unavailable in known quantum-gravity scenarios, may help the theory to avoid being ruled out by gamma-ray burst (GRB) observations, for which E_{*}> 10^{17} {GeV} or greater.

  16. Dam management and multifractal downscaling

    Science.gov (United States)

    Biaou, A.; Hubert, P.; Schertzer, D.; Hendrickx, F.; Tchiguirinskaia, I.

    2003-04-01

    In order to get a more efficient production management of reservoirs, it would be helpful to apply long-term meteorological forecasts to hydrological models. Unfortunately, the explicit scales of present meteorological models are quite larger than those of hydrological models. Therefore it is indispensable to proceed to a downscaling of the output of the former in order to obtain an input for the latter. In this paper, we discuss a multifractal downscaling procedure. This type of procedure was motivated because it deals with scaling variability of the fields. The site of the study is the region of the Doubs, but we make an extension on the whole France for the multifractale analysis to take into account well the spatial variabilities. We first present the results of a detailed multifractal analysis of various data bases. Concerning the development of our downscaling model, we show how to develop a scaling space-time cascade, which takes into account the distinct space and time scaling. We will present it first in the framework of the pedagogical b-model and a-model, then in the framework of universal multifractal models. The obtained results can be the object of an relief and microclimate conditioning before being compared with the real values.

  17. Multifractal analysis of complex networks

    Institute of Scientific and Technical Information of China (English)

    Wang Dan-Ling; Yu Zu-Guo; Anh V

    2012-01-01

    Complex networks have recently attracted much attention in diverse areas of science and technology.Many networks such as the WWW and biological networks are known to display spatial heterogeneity which can be characterized by their fractal dimensions.Multifractal analysis is a useful way to systematically describe the spatial heterogeneity of both theoretical and experimental fractal patterns.In this paper,we introduce a new box-covering algorithm for muttifractal analysis of complex networks.This algorithm is used to calculate the generalized fractal dimensions Dq of some theoretical networks,namely scale-free networks,small world networks,and random networks,and one kind of real network,namely protein-protein interaction networks of different species.Our numerical results indicate the existence of multifractality in scale-free networks and protein-protein interaction networks,while the multifractal behavior is not clear-cut for small world networks and random networks.The possible variation of Dq due to changes in the parameters of the theoretical network models is also discussed.

  18. Le iscrizioni cristiane di Roma

    OpenAIRE

    Battelli, Giulio

    1989-01-01

    Análisis de las inscripciones cristianas de Roma dividido en tres apartados: 1.-Estado de la cuestión de los estudios sobre el tema, aportando los principales elencos y obras que tratan dichas inscripciones, minuciosamente comentados. 2.- Estudio de las inscripciones detallando sus características externas (tipos de monumentos, materiales usados, técnica de ejecución, tipo de letra) y las internas (fórmulas,símbolos).También se analiza el contenido indicando los nombres de aparición más...

  19. Diffusion and scattering in multifractal clouds

    Energy Technology Data Exchange (ETDEWEB)

    Lovejoy, S. [McGill Univ., Montreal, Quebec (Canada); Schertzer, D. [Universite Pierre et Marie Curie, Paris (France); Waston, B. [St. Lawrence Univ., Canton, NY (United States)] [and others

    1996-04-01

    This paper describes investigations of radiative properties of multifractal clouds using two different approaches. In the first, diffusion is considered by examining the scaling properties of one dimensional random walks on media with multifractal diffusivities. The second approach considers the scattering statistics associated with radiative transport.

  20. Multifractal Analysis for the Teichmueller Flow

    Energy Technology Data Exchange (ETDEWEB)

    Meson, Alejandro M., E-mail: meson@iflysib.unlp.edu.ar; Vericat, Fernando, E-mail: vericat@iflysib.unlp.edu.ar [Instituto de Fisica de Liquidos y Sistemas Biologicos (IFLYSIB) CCT-CONICET, La Plata-UNLP and Grupo de Aplicaciones Matematicas y Estadisticas de la Facultad de Ingenieria (GAMEFI) UNLP (Argentina)

    2012-03-15

    We present a multifractal description for Teichmueller flows. A key ingredient to do this is the Rauzy-Veech-Zorich reduction theory, which allows to treat the problem in the setting of suspension flows over subshifts. To perform the multifractal analysis we implement a thermodynamic formalism for suspension flows over countable alphabet subshifts a bit different from that developed by Barreira and Iommi.

  1. Multifractal Analysis of Inhomogeneous Bernoulli Products

    Science.gov (United States)

    Batakis, Athanasios; Testud, Benoît

    2011-03-01

    We are interested to the multifractal analysis of inhomogeneous Bernoulli products which are also known as coin tossing measures. We give conditions ensuring the validity of the multifractal formalism for such measures. On another hand, we show that these measures can have a dense set of phase transitions.

  2. MIXED SELF-CONFORMAL MULTIFRACTAL MEASURES

    Institute of Scientific and Technical Information of China (English)

    Meifeng Dai

    2009-01-01

    Mixed multifractal analysis studies the simultaneous scaling behavior of finitely many measures. A self-conformal measure is a measure invariant under a set of conformal mappings. In this paper, we provide a description of the mixed multifractal theory of finitely many self-conformal measures.

  3. Multifractal Analysis of Polyalanines Time Series

    CERN Document Server

    Figueirêdo, P H; Moret, M A; Coutinho, Sérgio; 10.1016/j.physa.2009.11.045

    2010-01-01

    Multifractal properties of the energy time series of short $\\alpha$-helix structures, specifically from a polyalanine family, are investigated through the MF-DFA technique ({\\it{multifractal detrended fluctuation analysis}}). Estimates for the generalized Hurst exponent $h(q)$ and its associated multifractal exponents $\\tau(q)$ are obtained for several series generated by numerical simulations of molecular dynamics in different systems from distinct initial conformations. All simulations were performed using the GROMOS force field, implemented in the program THOR. The main results have shown that all series exhibit multifractal behavior depending on the number of residues and temperature. Moreover, the multifractal spectra reveal important aspects on the time evolution of the system and suggest that the nucleation process of the secondary structures during the visits on the energy hyper-surface is an essential feature of the folding process.

  4. Multifractal Properties of the Ukraine Stock Market

    CERN Document Server

    Ganchuk, A; Solovov, V

    2006-01-01

    Recently the statistical characterizations of financial markets based on physics concepts and methods attract considerable attentions. We used two possible procedures of analyzing multifractal properties of a time series. The first one uses the continuous wavelet transform and extracts scaling exponents from the wavelet transform amplitudes over all scales. The second method is the multifractal version of the detrended fluctuation analysis method (MF-DFA). The multifractality of a time series we analysed by means of the difference of values singularity stregth as a suitable way to characterise multifractality. Singularity spectrum calculated from daily returns using a sliding 1000 day time window in discrete steps of 1-10 days. We discovered that changes in the multifractal spectrum display distinctive pattern around significant "drawdowns". Finally, we discuss applications to the construction of crushes precursors at the financial markets.

  5. Change in ranking order of prescribing patterns by age and sex standardization of the practice population--audit may be misleading

    DEFF Research Database (Denmark)

    Olesen, Frede; Vedsted, Peter; Nielsen, Jørgen Nørskov

    1996-01-01

    OBJECTIVE: To demonstrate whether standardization of practice populations by age and sex changes the internal prescription ranking order of a group of practices. DESIGN: Data on the prescribing of cardiovascular drugs in a group of practices were obtained from a county-based database. Information...

  6. Social support, hopelessness and life satisfaction among Roma and non-Roma adolescents in Slovakia.

    Science.gov (United States)

    Kolarcik, P; Geckova, A Madarasova; Reijneveld, S A; van Dijk, J P

    2012-12-01

    Evidence on the psychosocial determinants of health among Roma adolescents is completely lacking. Our aim was to compare social support, life satisfaction and hopelessness of Slovak Roma and non-Roma adolescents and to assess the impact of parental education and social desirability on these differences. We conducted a cross-sectional study among Roma from settlements in the eastern part of Slovakia (N = 330; mean age = 14.50; interview) and non-Roma adolescents (N = 722; mean age = 14.86; questionnaire). The effect of ethnicity on social support, life satisfaction and hopelessness was analysed using linear regression, adjusted for gender, parental education and social desirability. Roma adolescents reported higher social support from parents, higher life satisfaction and higher hopelessness rates. Parental education explained part of the ethnic differences, as did social desirability. After adjustment for the aforementioned factors, differences by ethnicity remained statistically significant. Roma adolescents experience higher levels of social support, life satisfaction and hopelessness than non-Roma adolescents. Reduction of hopelessness feelings while maintaining levels of social support and life satisfaction among Roma adolescents should be a topic for both intervention and further research.

  7. Differences in the use of contraception between Roma and non-Roma women in Serbia.

    Science.gov (United States)

    Nikolic, Zeljka; Djikanovic, Bosiljka

    2015-12-01

    Unwanted pregnancies are still common in Central and Eastern European countries, including Serbia. Little is known about the use of contraception in different ethnic groups. This research was undertaken to investigate the use of contraception between Roma and non-Roma women in Serbia and factors associated with it. Data from the 2010 Multiple Indicator Cluster Survey (MICS4) conducted in Serbia were used. This research included 1082 Roma and 2145 non-Roma women aged 15-49. Univariate and multivariate logistic regression analyses were used to analyze socio-demographic factors associated with the use of contraception in both population groups. Roma women use any type of contraception more often than non-Roma women. However, Roma women rely more on traditional and unsafe methods such as withdrawal and lactational amenorrhea method, but significantly less on modern methods such as pill, condom and intrauterine device. Place of living (region) is also associated with contraceptive usage. Inequalities in the use of contraception between Roma and non-Roma women exist. Promoting modern methods of contraception and education about the importance of the use of contraception should be in the focus of national health policies and strategies related to reproductive health to reduce these inequalities. © The Author 2014. Published by Oxford University Press on behalf of Faculty of Public Health. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.

  8. Roma and non-Roma conflicts in the light of power relationships

    Directory of Open Access Journals (Sweden)

    Gábor Héra

    2013-01-01

    Full Text Available The article summarises the findings of the first phase of an action research study focusing on how restorative justice approaches and practices can support conflict resolution within an intercultural context. The author will describe the relationship between the Roma and non-Roma residents in a Hungarian village. Consideration will be given to the “ordering groups” of the local community and will discuss some of their conflicts. It will be argued that these ordering groups may influence inter-ethnic relationships and impact how Roma and non-Roma members of the community may live harmoniously together.

  9. Computational approach to multifractal music

    OpenAIRE

    Oświęcimka, Paweł; Kwapień, Jarosław; Celińska, Iwona; Drożdż, Stanisław; Rak, Rafał

    2011-01-01

    In this work we perform a fractal analysis of 160 pieces of music belonging to six different genres. We show that the majority of the pieces reveal characteristics that allow us to classify them as physical processes called the 1/f (pink) noise. However, this is not true for classical music represented here by Frederic Chopin's works and for some jazz pieces that are much more correlated than the pink noise. We also perform a multifractal (MFDFA) analysis of these music pieces. We show that a...

  10. The medical social centres in support of Roma in Greece

    DEFF Research Database (Denmark)

    Andrioti, Despena; Kotrotsou, Christina; Tsakatara, Vanta

    2013-01-01

    Roma people form the largest ethnic-minority group in Europe. They account for around 10 to 12 million people, and they face racism, discrimination and social exclusion in most countries. The Roma population of Greece currently numbers around 250 000 individuals. They have Greek nationality...... Strategic Framework for Roma 2012-2020 (http://ec.europa.eu/justice/ discrimination/roma/national- strategies/index-en. htm) builds on this initiative to provide comprehensive, cost-effective housing, employment, education and health services to Greek and undocumented Roma. Furthermore, Roma should...

  11. Detrending moving average algorithm for multifractals

    Science.gov (United States)

    Gu, Gao-Feng; Zhou, Wei-Xing

    2010-07-01

    The detrending moving average (DMA) algorithm is a widely used technique to quantify the long-term correlations of nonstationary time series and the long-range correlations of fractal surfaces, which contains a parameter θ determining the position of the detrending window. We develop multifractal detrending moving average (MFDMA) algorithms for the analysis of one-dimensional multifractal measures and higher-dimensional multifractals, which is a generalization of the DMA method. The performance of the one-dimensional and two-dimensional MFDMA methods is investigated using synthetic multifractal measures with analytical solutions for backward (θ=0) , centered (θ=0.5) , and forward (θ=1) detrending windows. We find that the estimated multifractal scaling exponent τ(q) and the singularity spectrum f(α) are in good agreement with the theoretical values. In addition, the backward MFDMA method has the best performance, which provides the most accurate estimates of the scaling exponents with lowest error bars, while the centered MFDMA method has the worse performance. It is found that the backward MFDMA algorithm also outperforms the multifractal detrended fluctuation analysis. The one-dimensional backward MFDMA method is applied to analyzing the time series of Shanghai Stock Exchange Composite Index and its multifractal nature is confirmed.

  12. Palacio de deportes, en Roma

    Directory of Open Access Journals (Sweden)

    Nervi, Pier Luigi

    1960-04-01

    Full Text Available El nuevo Palacio de Deportes de Roma ha sido construido en los terrenos del EUR, con capacidad para 18.000 personas, siendo la característica principal del proyecto su regularidad. Su planta circular está provista de 12 escalinatas de acceso, de las cuales unas están destinadas al público de las gradas altas y otras al de las gradas bajas. En la sección transversal puede apreciarse cómo en correspondencia con cada uno de estos graderíos se desarrolla una galería de circunvalación que puede servir como lugar de exposiciones o vestíbulos de entreactos.

  13. Multifractal analysis of stock exchange crashes

    Science.gov (United States)

    Siokis, Fotios M.

    2013-03-01

    We analyze the complexity of rare events of the DJIA Index. We reveal that the returns of the time series exhibit strong multifractal properties meaning that temporal correlations play a substantial role. The effect of major stock market crashes can be best illustrated by the comparison of the multifractal spectra of the time series before and after the crash. Aftershock periods compared to foreshock periods exhibit richer and more complex dynamics. Compared to an average crash, calculated by taking into account the larger 5 crashes of the DJIA Index, the 1929 event exhibits significantly more increase in multifractality than the 1987 crisis.

  14. Anxiety and sense of coherence in Roma and non-Roma coronary heart disease patients.

    Science.gov (United States)

    Silarova, Barbora; Nagyova, Iveta; Van Dijk, Jitse P; Rosenberger, Jaroslav; Reijneveld, Sijmen A

    2014-01-01

    Morbidity and mortality among Roma due to coronary heart disease (CHD) is high, but evidence on potential psychosocial pathways is lacking. This study aimed to assess the differences in the severity of anxiety symptoms and in the sense of coherence (SOC) between Roma and non-Roma CHD patients, crude and adjusted for age, sex, functional status and socio-economic status (SES). We examined 607 CHD patients (mean age 58.0 ± 7.4, 28.7% female) scheduled for coronary angiography, 98 (16.1%) of whom were Roma. Anxiety symptoms were measured using the Hospital Anxiety and Depression Scale and SOC using the 13-item Orientation to Life Questionnaire. Data were analysed using hierarchical regression. Roma ethnicity was associated with more severe anxiety (B = 1.89; [95% confidence interval (CI) = 0.79; 2.98]) adjusted for age, sex, functional status and SES. Roma ethnicity was also associated with lower SOC (B = -4.77; [95% CI = -7.85; -1.68]) adjusted for age, sex and functional status. The latter association lost statistical significance after adjustment for SES. Roma ethnicity is associated with more anxiety symptoms and lower SOC among CHD patients. Our findings indicate that Roma CHD patients have a worse position regarding psychosocial factors that increase mortality and thus require additional attention.

  15. Seven years' mortality in Roma and non-Roma patients after coronary angiography

    NARCIS (Netherlands)

    Sudzinova, Adriana; Nagyova, Iveta; Rosenberger, Jaroslav; Studencan, Martin; Vargova, Helena; Middel, Berrie; van Dijk, Jitse P.; Reijneveld, Sijmen A.

    2015-01-01

    BACKGROUND: Ethnicity is associated with differences in clinical course and outcomes of cardiac disease, often in association with a poorer socioeconomic position. The aim of this study was to compare the mortality after coronary angiography (CAG) of Roma and non-Roma patients matched for education

  16. Higher prevalence of nephropathy in young Roma females compared with non-Roma females.

    Science.gov (United States)

    Rosenberger, Jaroslav; Majerníková, Mária; Jarcuska, Peter; Pella, Daniel; Mareková, Mária; Gecková, Andrea Madarasová; Halánová, Monika

    2014-03-01

    Ethnic differences in the prevalence of various chronic diseases, including end-stage renal disease, have been previously reported. Surprisingly, data focusing on the lower grade of chronic kidney disease (CKD) are scarce. Thus, the aim of this study was to explore differences in the prevalence of nephropathy between the Roma and non-Roma populations. Data from the cross-sectional population based HepaMeta study conducted in Slovakia were used. Nephropathy was defined as: a known history of any kidney disease; or the presence of proteinuria/hematuria; or glomerular filtration rate (GFR) Roma females had OR of 1.56 for having nephropathy over non-Roma females (OR 1.56; 95% CI 1.01-2.42; p Roma females had a significantly lower GFR (mean difference 3.4 ml/min, t = -3.58, p Roma. This cross-sectional study on the young general population found that Roma females have half-higher odds for nephropathy than non-Roma females. Therefore, to prevent risks we should focus on searching for ethnic, social and medical determinants of CKD. Interventions to decrease the incidence of CKD in the target population should also address ethnic inequalities as well as female gender.

  17. Roma between discrimination and integration: Social change and the status of Roma

    Directory of Open Access Journals (Sweden)

    Jakšić Božidar Lj.

    2002-01-01

    Full Text Available Roma are a highly dispersed ethnic communicate. After international protectorate was established in Kosovo. Roma have become the most numerous ethnic minority in Yugoslavia. When discrimination against and integration of Roma people are concerned, it has to be kept in mind that thus far Roma have been exposed most often to negative discrimination, while integration for them has often meant de facto assimilation. As positive discrimination of minority groups in a society is also a viable option, the approach to the 'Roma issue' basically implies a strategic shift in the conduct of all state institutions and other social factors - from negative to positive discrimination, and from assimilation towards genuine integration of Roma. The basic approach suggested by this author is the one that enables Roma to be equal citizens of this country. The circles of poverty hi which Roma population finds itself are increasingly deeper. However, the realm of poverty is spreading across the entire space of Yugoslavia. Pauperization prevails. The devastation of living conditions for all citizens of Yugoslavia, i.e. of Serbia and Montenegro, except for the narrow circle of war profiteers and people involved with power centers, has been underway for over a decade. Middle classes have disappeared from the social scene, while many families have dropped to the sub-proletarian zone of poverty.

  18. IDENTIFYING AND CHANGING STEREOTYPES BETWEEN ROMA AND NON-ROMA: FROM THEORY TO PRACTICE

    Directory of Open Access Journals (Sweden)

    Gregor Maučec

    2013-09-01

    Full Text Available Having shortly delineated and theoretically defined the concept of stereotypes (as collective social constructs and stereotyping as such, the author turns to much more complex issue as to how to identify and change stereotypes about Roma, which are deeply rooted in mainstream European societies where they live and also those stereotypes that are nurtured and strictly followed by the Roma and which relate to non-Roma. The author arrives at a conclusion that today one can note several factors and conditions in European countries which still nurture and further reinforce especially anti-Roma stereotypes. According to him, the specific and carefully elaborated stereotypes-oriented policies and strategies which favour mutual education, knowledge and understanding as well as ongoing contact and dialogue between the two different ethnic, social and cultural identities at both EU and member states levels are conditio sine qua non for the enhanced and overall Roma inclusion and integration.

  19. On the multifractal effects generated by monofractal signals

    CERN Document Server

    Grech, Dariusz

    2013-01-01

    We study quantitatively the level of false multifractal signal one may encounter while analyzing multifractal phenomena in time series within multifractal detrended fluctuation analysis (MF-DFA). The investigated effect appears as a result of finite length of used data series and is additionally amplified by the long-term memory the data eventually may contain. We provide the detailed quantitative description of such apparent multifractal background signal as a threshold in spread of generalized Hurst exponent values $\\Delta h$ or a threshold in the width of multifractal spectrum $\\Delta \\alpha$ below which multifractal properties of the system are only apparent, i.e. do not exist, despite $\\Delta\\alpha\

  20. Multifractal analyis of soil invertebrates along a transect under different land uses

    Science.gov (United States)

    Machado Siqueira, Glécio; Alves Silva, Raimunda; Vidal-Vázquez, Eva; Paz-González, Antonio

    2017-04-01

    Soil fauna play a central role in many essential ecosystem processes. Land use and management can have a dramatic effect upon soil invertebrate community. Indices based on soil invertebrates abundance and diversity are fundamental for soil quality assessment. Many soil properties and attributes have been shown to exhibit spatial variabilityThe aim of this study was to analyze the scaling heterogeneity of the soil invertebrate community sampled using pitfall traps across a transect. The field study was conducted at Mata Roma municipality, Maranhão State, Brazil. Transects were marked under seven different agricultural/forestry land uses (millet, soybean, maize, eucalyptus, pasture, secondary savannah and native savannah). Native vegetation was considered as a reference, whereas the agricultural fields showed a range of soil use intensities. Along these transects 130 pitfall per land use were installed. First, differences in community assemblages and composition under different land use systems were evaluated using classical indices. Then, the spatial distribution of soil fauna trapped by pitfall techniques, characterized through generalized dimension, Dq, and singularity spectra, f(α) - α, showed a well-defined multifractal structure. Differences in scaling heterogeneity and other multifractal characteristics were examined in relation to land use intensification.

  1. Roma Identity as an Expert-Political Construction

    OpenAIRE

    Mihai Surdu; Martin Kovats

    2015-01-01

    The creation of an EU Framework for national Roma integration strategies (2011) marks a significant step in the politicisation of Roma identity by ensuring a further increase in the number of initiatives, projects and programmes explicitly targeting Roma. The Framework itself is part of a process that began with postcommunist transition and which has produced historically unprecedented levels of Roma political activism along with a proliferation of national and transnational policy initiative...

  2. MULTIFRACTAL STRUCTURE AND PRODUCT OF MATRICES

    Institute of Scientific and Technical Information of China (English)

    Lau Ka-sing

    2003-01-01

    There is a well established multifractal theory for self-similar measures generated by non-overlapping contractive similutudes.Our report here concerns those with overlaps.In particular we restrict our attention to the important classes of self-similar measures that have matrix representations.The dimension spectra and the Lq-spectra are analyzed through the product of matrices.There are abnormal behaviors on the multifrac-tal structure and they will be discussed in detail.

  3. Multifractal Models, Intertrade Durations and Return Volatility

    OpenAIRE

    Segnon, Mawuli Kouami

    2015-01-01

    This thesis covers the application of multifractal processes in modeling financial time series. It aims to demonstrate the capacity and the robustness of the multifractal processes to better model return volatility and ultra high frequency financial data than both the generalized autoregressive conditional heteroscedasticity (GARCH)-type and autoregressive conditional duration (ACD) models currently used in research and practice. The thesis is comprised of four main parts that ...

  4. Fractal and multifractal analyses of bipartite networks.

    Science.gov (United States)

    Liu, Jin-Long; Wang, Jian; Yu, Zu-Guo; Xie, Xian-Hua

    2017-03-31

    Bipartite networks have attracted considerable interest in various fields. Fractality and multifractality of unipartite (classical) networks have been studied in recent years, but there is no work to study these properties of bipartite networks. In this paper, we try to unfold the self-similarity structure of bipartite networks by performing the fractal and multifractal analyses for a variety of real-world bipartite network data sets and models. First, we find the fractality in some bipartite networks, including the CiteULike, Netflix, MovieLens (ml-20m), Delicious data sets and (u, v)-flower model. Meanwhile, we observe the shifted power-law or exponential behavior in other several networks. We then focus on the multifractal properties of bipartite networks. Our results indicate that the multifractality exists in those bipartite networks possessing fractality. To capture the inherent attribute of bipartite network with two types different nodes, we give the different weights for the nodes of different classes, and show the existence of multifractality in these node-weighted bipartite networks. In addition, for the data sets with ratings, we modify the two existing algorithms for fractal and multifractal analyses of edge-weighted unipartite networks to study the self-similarity of the corresponding edge-weighted bipartite networks. The results show that our modified algorithms are feasible and can effectively uncover the self-similarity structure of these edge-weighted bipartite networks and their corresponding node-weighted versions.

  5. Fractal and multifractal analyses of bipartite networks

    Science.gov (United States)

    Liu, Jin-Long; Wang, Jian; Yu, Zu-Guo; Xie, Xian-Hua

    2017-01-01

    Bipartite networks have attracted considerable interest in various fields. Fractality and multifractality of unipartite (classical) networks have been studied in recent years, but there is no work to study these properties of bipartite networks. In this paper, we try to unfold the self-similarity structure of bipartite networks by performing the fractal and multifractal analyses for a variety of real-world bipartite network data sets and models. First, we find the fractality in some bipartite networks, including the CiteULike, Netflix, MovieLens (ml-20m), Delicious data sets and (u, v)-flower model. Meanwhile, we observe the shifted power-law or exponential behavior in other several networks. We then focus on the multifractal properties of bipartite networks. Our results indicate that the multifractality exists in those bipartite networks possessing fractality. To capture the inherent attribute of bipartite network with two types different nodes, we give the different weights for the nodes of different classes, and show the existence of multifractality in these node-weighted bipartite networks. In addition, for the data sets with ratings, we modify the two existing algorithms for fractal and multifractal analyses of edge-weighted unipartite networks to study the self-similarity of the corresponding edge-weighted bipartite networks. The results show that our modified algorithms are feasible and can effectively uncover the self-similarity structure of these edge-weighted bipartite networks and their corresponding node-weighted versions. PMID:28361962

  6. Fractal and multifractal analyses of bipartite networks

    Science.gov (United States)

    Liu, Jin-Long; Wang, Jian; Yu, Zu-Guo; Xie, Xian-Hua

    2017-03-01

    Bipartite networks have attracted considerable interest in various fields. Fractality and multifractality of unipartite (classical) networks have been studied in recent years, but there is no work to study these properties of bipartite networks. In this paper, we try to unfold the self-similarity structure of bipartite networks by performing the fractal and multifractal analyses for a variety of real-world bipartite network data sets and models. First, we find the fractality in some bipartite networks, including the CiteULike, Netflix, MovieLens (ml-20m), Delicious data sets and (u, v)-flower model. Meanwhile, we observe the shifted power-law or exponential behavior in other several networks. We then focus on the multifractal properties of bipartite networks. Our results indicate that the multifractality exists in those bipartite networks possessing fractality. To capture the inherent attribute of bipartite network with two types different nodes, we give the different weights for the nodes of different classes, and show the existence of multifractality in these node-weighted bipartite networks. In addition, for the data sets with ratings, we modify the two existing algorithms for fractal and multifractal analyses of edge-weighted unipartite networks to study the self-similarity of the corresponding edge-weighted bipartite networks. The results show that our modified algorithms are feasible and can effectively uncover the self-similarity structure of these edge-weighted bipartite networks and their corresponding node-weighted versions.

  7. Roma Education and Public Policy: A European Perspective

    Science.gov (United States)

    Liegeois, Jean-Pierre

    2007-01-01

    The trajectory of the Roma is illuminating for understanding the social situation of other minorities, but also for a set of issues concerning the multiculturalism present within states. In this article, the author discusses the context of Roma education--marked by the stateless and marginalized status of the Roma--and provides a brief history of…

  8. Stigma and Roma Education Policy Reform in Slovakia

    Science.gov (United States)

    New, William

    2012-01-01

    This article addresses reform of Roma education in Slovakia against the backdrop of continued stigmatization of Roma students. Transnational NGOs and IGOs promote rights-based solutions leading to the fullest possible inclusion of Roma students in mainstream education. The Slovak state promotes educational policies that lead to the fullest…

  9. Stigma and Roma Education Policy Reform in Slovakia

    Science.gov (United States)

    New, William

    2012-01-01

    This article addresses reform of Roma education in Slovakia against the backdrop of continued stigmatization of Roma students. Transnational NGOs and IGOs promote rights-based solutions leading to the fullest possible inclusion of Roma students in mainstream education. The Slovak state promotes educational policies that lead to the fullest…

  10. Beyond Inclusion: Reconsidering Policies, Curriculum, and Pedagogy for Roma Students

    Science.gov (United States)

    Miskovic, Maja; Curcic, Svjetlana

    2016-01-01

    This paper investigates the policies and politics of including European Roma students in mainstream educational systems within the context of two European Union (EU) policies: the Decade of Roma Inclusion (2005-2015) and EU National Roma Integration Strategies (2013-2020). Drawing on the scholarship about inclusion and its practical achievements,…

  11. Roma Education and Public Policy: A European Perspective

    Science.gov (United States)

    Liegeois, Jean-Pierre

    2007-01-01

    The trajectory of the Roma is illuminating for understanding the social situation of other minorities, but also for a set of issues concerning the multiculturalism present within states. In this article, the author discusses the context of Roma education--marked by the stateless and marginalized status of the Roma--and provides a brief history of…

  12. Communication with Roma Patient – a Challenge

    Directory of Open Access Journals (Sweden)

    Andrada PARVU

    2013-03-01

    Full Text Available Objective: This article examines culture-based particularities of communication between doctors and Romani chronic patients.Methods: Qualitative study consisting of 48 semi-structured individual with Roma patients and their careers from two Romanian counties (Iasi and Cluj and 3 focus groups with health mediators. The interviews were analysed using Interpretative Phenomenological Analysis.Results: Answers varied according to participants’ degree of acculturation. The family plays a central role in caring for the patient, accompanies him at doctor visits, and interferes to doctor-patient communication. Communicating with the patient must be tailored to the Roma patients.Conclusion: To optimise communication, medical staff should be aware and respectful of cultural values, customs, and perceptions of the Roma regarding health and illness. Failure to observe these criteria may lead to breach of doctor-patient relationship, and possible failure of medical care. The degrees of individual Roma acculturation into the Romanian culture must be taken into consideration, and adjust the pattern of communication accordingly. The role of health mediators in the communication between medical staff and Romani patients are very important.Practical implications: The dissemination of information regarding the Roma cultural values in regards to illness helps the health services adapt and create a holistic multicultural care model.

  13. Are barriers in accessing health services in the Roma population associated with worse health status among Roma?

    NARCIS (Netherlands)

    Jarcuska, P.; Bobakova, D.; Uhrin, J.; Bobak, L.; Babinska, I.; Kolarcik, P.; Veselska, Z.; Madarasova-Geckova, A.

    2013-01-01

    The health of Roma has been found to be poorer than that of the majority population. The aim of this study was to explore the differences between Roma and non-Roma regarding perceived barriers in accessing health services. Furthermore, we aimed to assess the association between self-rated health

  14. To what extent does socioeconomic status explain differences in health between Roma and non-Roma adolescents in Slovakia?

    NARCIS (Netherlands)

    Kolarcik, Peter; Geckova, Andrea Madarasova; Orosova, Olga; van Dijk, Jitse P.; Reijneveld, Sijmen A.

    The Roma make up one of the largest ethnic groups in Europe. The few studies that are available report health among the Roma as considerably worse than that of the majority population, and virtually nothing is known about the health status of Roma adolescents. The purpose of this study was to

  15. Cultural Mismatch in Roma Parents' Perceptions: The Role of Culture, Language, and Traditional Roma Values in Schools

    Science.gov (United States)

    Lambrev, Veselina

    2015-01-01

    This article draws on data from a two-year qualitative study exploring the factors contributing to Roma students' disparate outcomes in Bulgaria. I utilize ethnographic observations, oral history, and in-depth interviews with twenty Roma parents to gain understanding of Roma children's "cultural capital" and relation to formal schools.…

  16. Are barriers in accessing health services in the Roma population associated with worse health status among Roma?

    NARCIS (Netherlands)

    Jarcuska, P.; Bobakova, D.; Uhrin, J.; Bobak, L.; Babinska, I.; Kolarcik, P.; Veselska, Z.; Madarasova-Geckova, A.

    2013-01-01

    The health of Roma has been found to be poorer than that of the majority population. The aim of this study was to explore the differences between Roma and non-Roma regarding perceived barriers in accessing health services. Furthermore, we aimed to assess the association between self-rated health sta

  17. Cultural Mismatch in Roma Parents' Perceptions: The Role of Culture, Language, and Traditional Roma Values in Schools

    Science.gov (United States)

    Lambrev, Veselina

    2015-01-01

    This article draws on data from a two-year qualitative study exploring the factors contributing to Roma students' disparate outcomes in Bulgaria. I utilize ethnographic observations, oral history, and in-depth interviews with twenty Roma parents to gain understanding of Roma children's "cultural capital" and relation to formal schools.…

  18. A Mixed Generalized Multifractal Formalism For Vector Valued Measures

    OpenAIRE

    Mabrouk, Anouar Ben

    2012-01-01

    We introduce a mixed generalized multifractal formalism which extends the mixed multifractal formalism introduced by L. Olsen based on generalizations of the Hausdorff and packing measures. The validity of such a formalism is proved in some special cases.

  19. GEOVISUALIZACION DEL TURISMO URBANO. ROMA

    Directory of Open Access Journals (Sweden)

    Fabien Girardin

    2008-01-01

    Full Text Available En los últimos años, el gran despliegue de las tecnologías inalámbricas y de telefonía móvil han proporcionado maneras nuevas de entender la dinámica de una ciudad que brindan nuevas perspectivas para los planificadores de urbanismo, los ingenieros de tráfico, las autoridades de turismo, más allá de los métodos tradicionales de recolección de datos como el recuento de tráfico en cruces viarios o las encuestas personales o telefónicas. Este trabajo, presenta la oportunidad emergente que supone el uso y práctica de geo-visualizaciones que permiten revelar el "pulso de una ciudad" con la visualización de los datos espacio-temporales generados gracias a la interacción de las personas con el entorno urbano, para lo cual se georreferencian algunos fenómenos en la ciudad de Roma.

  20. Multifractal analysis of heartbeat dynamics during meditation training

    Science.gov (United States)

    Song, Renliang; Bian, Chunhua; Ma, Qianli D. Y.

    2013-04-01

    We investigate the multifractality of heartbeat dynamics during Chinese CHI meditation in healthy young adults. The results show that the range of multifractal singularity spectrum of heartbeat interval time series during meditation is significantly narrower than those in the pre-meditation state of the same subject, which indicates that during meditation the heartbeat becomes regular and the degree of multifractality decreases.

  1. Clinical and biochemical determinants of metabolic syndrome among Roma and non-Roma subjects in the eastern part of Slovakia.

    Science.gov (United States)

    Fedacko, Ján; Pella, Daniel; Jarcuska, Peter; Siegfried, Leonard; Janicko, Martin; Veselíny, Eduard; Sabol, Frantisek; Jarcuska, Pavol; Mareková, Mária; Gecková, Andrea Madarasová; Pazinka, Peter; Jankajová, Monika; Kmec, Ján; Babcák, Marián; Kalanin, Peter; Drazilová, Sylvia

    2014-03-01

    The metabolic syndrome (MS) is a clustering of cardiovascular risk. The high prevalence of metabolic syndrome among populations of lower socioeconomic status is a cause of concern and calls for an effective public health response. The aim of this study was to determine the prevalence of metabolic syndrome in the Roma population compared with the non-Roma population in the eastern part of Slovakia and to determine the parameter which has the strongest association with metabolic syndrome. 123 Roma and 79 non-Roma patients with metabolic syndrome were evaluated. In the subgroup of Roma men, we found that waist circumference conferred the highest chance of MS (more than 12-times), followed by triglycerides (TG) (3.670-times). In the subgroup of non-Roma men, we found that waist circumference conferred the highest chance of MS (more than 16-times), followed by high-density lipoprotein (HDL) (4.348-times increased risk per one unit decrease in HDL). In the subgroup of Roma women as well as non-Roma women, we found that serum TG conferred the highest chance of MS, followed by waist circumference for Roma women. Comparing non-classical risk factors for MS we found that only age (with OR 1.977) and high-sensitivity C-reactive protein (hsCRP) (OR 1.887) were significant and independent predictors of MS in Roma men. Among Roma women apolipoprotein B100 was also found to be an independent predictor of MS, besides age and hsCRP. Our study confirmed that the prevalence of metabolic syndrome is strongly associated with hypertriglyceridemic waist, besides other risk factors, a marker of the atherogenic metabolic triad among younger Roma population, which may be the reason for the increased cardiovascular (CV) morbidity and mortality in elderly Roma compared with non-Roma. In light of these results, better prevention of CV events for Roma minority settlements in Slovakia should be provided.

  2. Attitudes of the Prekmurje Roma towards health and healthcare.

    Science.gov (United States)

    Zelko, Erika; Švab, Igor; Maksuti, Alem; Klemenc-Ketiš, Zalika

    2015-12-01

    Knowledge of the culture, traditions and values of the Roma is important for understanding their relationship to health and the health system. The Roma in Prekmurje, the far northeastern part of Slovenia, are a unique ethnic group and in many respects different from other Roma. The aim of the study was to determine their attitudes towards health and the healthcare system. We conducted 25 interviews in Roma settlements. The participants were between 18 and 64 years of age, with the average age being 23.46 years old; 48 % were men and 52 % women. We used qualitative content analysis as the data analysis technique. As a tool to facilitate the qualitative data analysis, we used the software Atlas.ti. In the study, we used a data-driving coding scheme. Two independent coders carried out the coding. We determined eight logical categories that explain the attitudes of the Roma towards health, satisfaction, problems and prospects and the functioning of the health system at the local level. These are experiences with the healthcare system, personal healthcare, the perception of health and illness, suggestions for improvement, common diseases as perceived by the Roma, poverty and socioeconomic status of the Roma, discrimination and the need for a better understanding of the Roma. Roma culture and their customs affect the Roma's relationship with health and the healthcare services in Prekmurje. The Roma are willing to participate in health status improvement, but require special attention within the national healthcare system.

  3. Laboratorio di Cartografia Archeologica di Roma

    Directory of Open Access Journals (Sweden)

    Redazione Redazione

    2007-03-01

    Full Text Available Il Laboratorio di Cartografia Archeologica nasce per Roma e nei suoi meandri, per così dire, si nasconde. Situato al 28 di via del Monte Testaccio, in quella che la notte diventa la protagonista della vita notturna della Capitale, il Laboratorio passerebbe inosservato se non fosse per la porticina chereca impressa la sua targa. Oltrepassata la soglia, però, quelloche si incontra è un gigantesco mondo di materiale cartografico e di informazioni dedicate alla vasto patrimonio archeologico (ma non solo che caratterizza Roma.

  4. Life Satisfaction and Happiness Among the Roma in Central and Southeastern Europe

    NARCIS (Netherlands)

    Kamberi, Ermira; Martinovic, Borja|info:eu-repo/dai/nl/304822752; Verkuijten, Maykel|info:eu-repo/dai/nl/073378542

    2015-01-01

    This study examines general life satisfaction and happiness as two indicators of subjective well-being among Roma and non-Roma populations in Central and Southeastern Europe. Using a sample of 11,997 participants (Roma N = 8,399, non-Roma N = 3,598) from the Regional Roma Survey in 2011 we test a

  5. Gran centro comercial - Roma (Italia

    Directory of Open Access Journals (Sweden)

    Barucci, P.

    1971-05-01

    Full Text Available This large commercial centre built in Rome is organised in three main zones. The top zone extends over the nine floors of four separate buildings, and is devoted to offices. A second zone is utilised for a variety of commercial activities, whilst the third one serves auxiliary uses, such as car parking space, stores, archives, and such like. The project is based on a modular reticule of 1.80 m length. It is conceived as the sum of human living spaces, so that it is more like an urban zone than a single building: it seeks to contain within it most of the facilities that constitute a zone of urban activity.Este gran Centro Comercial construido en Roma, aparece organizado en tres zonas: una elevada destinada a oficinas, constituida por cuatro edificios de nueve plantas; una segunda zona dedicada a oficinas de representaciones, comercios y otras actividades similares; y la tercera, ocupada por los estacionamientos para vehículos, almacenes, archivos, servicios de los diferentes bloques, etc. Diseñado partiendo de una retícula modular de 1,80 m de lado, su concepción arquitectónica se ha basado en la creación de diversos espacios humanos, organizados de modo que más que un edificio en el sentido tradicional aparece como un complejo arquitectónico a escala urbana, en cuanto que están presentes en él los elementos fundamentales que constituyen la vida de la ciudad.

  6. Multifractal modelling of runoffs of karstic springs

    Science.gov (United States)

    Márkus, L.

    2003-04-01

    A new multifractal stochastic process, Terdik and Iglói call the Limit of the Integrated Superposition of Diffusion processes with Linear differential Generator (LISDLG) , has been defined for modelling network traffic multifractality. The process is stationary, and exhibits long range dependency or long memory. Its characteristic property is that its bispectrum is real. It serves as the basis of distinction e.g. from the superposition of Levy-processes driven Ornstein-Uhlenbeck processes. Its further appealing property is that its finite dimensional distribution stems from multivariate Gamma, therefore it is inherently positive and skewed (and hence non-Gaussian). All together, this makes it a very promising candidate for modelling e.g. runoff data of springs or river flows. Quite recently Labat et al. (2002, J. of Hydrology, Vol 256, pp.176-195) pointed out multifractal properties of the runoff time series of French karstic springs. We show that runoff data of karstic springs in north-east Hungary possesses multifractal and cumulant-multifractal property as well as long range dependency and fit the above described LISDLG process, to model the phenomenon. Acknowledgement: This research was supported by the Nat. Sci. Research Fund OTKA, grant No.: T 032725.

  7. Multifractality and intermittency in the solar wind

    Directory of Open Access Journals (Sweden)

    W. M. Macek

    2007-11-01

    Full Text Available Within the complex dynamics of the solar wind's fluctuating plasma parameters, there is a detectable, hidden order described by a chaotic strange attractor which has a multifractal structure. The multifractal spectrum has been investigated using Voyager (magnetic field data in the outer heliosphere and using Helios (plasma data in the inner heliosphere. We have also analyzed the spectrum for the solar wind attractor. The spectrum is found to be consistent with that for the multifractal measure of the self-similar one-scale weighted Cantor set with two parameters describing uniform compression and natural invariant probability measure of the attractor of the system. In order to further quantify the multifractality, we also consider a generalized weighted Cantor set with two different scales describing nonuniform compression. We investigate the resulting multifractal spectrum depending on two scaling parameters and one probability measure parameter, especially for asymmetric scaling. We hope that this generalized model will also be a useful tool for analysis of intermittent turbulence in space plasmas.

  8. Multifractality and Network Analysis of Phase Transition

    Science.gov (United States)

    Li, Wei; Yang, Chunbin; Han, Jihui; Su, Zhu; Zou, Yijiang

    2017-01-01

    Many models and real complex systems possess critical thresholds at which the systems shift dramatically from one sate to another. The discovery of early-warnings in the vicinity of critical points are of great importance to estimate how far the systems are away from the critical states. Multifractal Detrended Fluctuation analysis (MF-DFA) and visibility graph method have been employed to investigate the multifractal and geometrical properties of the magnetization time series of the two-dimensional Ising model. Multifractality of the time series near the critical point has been uncovered from the generalized Hurst exponents and singularity spectrum. Both long-term correlation and broad probability density function are identified to be the sources of multifractality. Heterogeneous nature of the networks constructed from magnetization time series have validated the fractal properties. Evolution of the topological quantities of the visibility graph, along with the variation of multifractality, serve as new early-warnings of phase transition. Those methods and results may provide new insights about the analysis of phase transition problems and can be used as early-warnings for a variety of complex systems. PMID:28107414

  9. Does the influence of peers and parents on adolescents' drunkenness differ between Roma and non-Roma adolescents in Slovakia?

    Science.gov (United States)

    Bobakova, Daniela; Kolarcik, Peter; Geckova, Andrea Madarasova; Klein, Daniel; Reijneveld, Sijmen A; van Dijk, Jitse P

    2012-01-01

    Roma adolescents have been shown to use less alcohol than non-Roma adolescents. This could be due to the protective influences of peers and parents. The purpose of this study was to explore differences in the levels of peer and parental influence and their effects on drunkenness between Roma and non-Roma adolescents. Data were obtained in Eastern Slovakia from 330 Roma (mean age=14.50; 48.5% boys) and 722 non-Roma (mean age=14.86; 53.2% boys) primary school pupils. We analysed data on adolescent drunkenness (being drunk at least once in the past four weeks), parental monitoring (parents knowing with whom their children are when they go out) and peer influence (best friend drinking alcohol at least once a week) using logistic regression. Roma adolescents self-reported more parental monitoring and less peer influence when compared with their non-Roma counterparts (pRoma adolescents, whereas the effects of these factors per level do not vary between Roma and non-Roma adolescents.

  10. Are barriers in accessing health services in the Roma population associated with worse health status among Roma?

    Science.gov (United States)

    Jarcuska, Pavol; Bobakova, Daniela; Uhrin, Jan; Bobak, Ladislav; Babinska, Ingrid; Kolarcik, Peter; Veselska, Zuzana; Madarasova Geckova, Andrea

    2013-06-01

    The health of Roma has been found to be poorer than that of the majority population. The aim of this study was to explore the differences between Roma and non-Roma regarding perceived barriers in accessing health services. Furthermore, we aimed to assess the association between self-rated health status and Roma ethnicity and explore to what degree barriers in accessing health services explain this association. We used data from the cross-sectional HepaMeta study conducted in 2011 in Slovakia. The final sample comprised 452 Roma (mean age 34.7; 35.2 % men) and 403 (mean age 33.5; 45.9 % men) non-Roma respondents. Roma ethnicity was found to be significantly associated with poorer self-rated health status. A considerable part of this association can be explained by barriers in accessing health services as perceived by Roma. Worse health in Roma is partially mediated by worse access to health services, apart from a large educational gap between Roma living in settlements and the majority population. Interventions should focus not only on health literacy among Roma but also on the health care system and health care professionals.

  11. Changes in multifractal properties for stable angina pectoris

    Science.gov (United States)

    Knežević, Andrea; Martinis, Mladen; Krstačić, Goran; Vargović, Emil

    2005-12-01

    The multifractal approach has been applied to temporal fluctuations of heartbeat (RR) intervals, measured in various regimes of physical activity (ergometric data), taken from healthy subjects and those having stable angina pectoris (SAP). The problem we address here is whether SAP changes multifractality observed in healthy subjects. The G-moment method is used to analyse the multifractal spectrum. It is observed that both sets of data characterize multifractality, but a different trend in multifractal behaviour is found for SAP disease, under pronounced physical activity.

  12. Change in ranking order of prescribing patterns by age and sex standardization of the practice population--audit may be misleading

    DEFF Research Database (Denmark)

    Olesen, Frede; Vedsted, Peter; Nielsen, Jørgen Nørskov

    1996-01-01

    OBJECTIVE: To demonstrate whether standardization of practice populations by age and sex changes the internal prescription ranking order of a group of practices. DESIGN: Data on the prescribing of cardiovascular drugs in a group of practices were obtained from a county-based database. Information...... recommend prior age and sex standardization. Our results are of value in creating a more reliable basis for a debate on variation in prescribing patterns between peers......OBJECTIVE: To demonstrate whether standardization of practice populations by age and sex changes the internal prescription ranking order of a group of practices. DESIGN: Data on the prescribing of cardiovascular drugs in a group of practices were obtained from a county-based database. Information...... on the age, sex, and numbers of patients per practice was also obtained. The direct standardization method was used to adjust practice populations for age and sex. SETTING: The town of Randers, Aarhus County, Denmark. SUBJECTS: 35 practices, 41 GPs. MAIN OUTCOME MEASURES: Ranking of the 35 practices...

  13. Bloque de viviendas, Viale Pinturicchio - Roma

    Directory of Open Access Journals (Sweden)

    Luccichenti, V.

    1957-11-01

    Full Text Available Este edificio fue realizado por iniciativa del Instituto de Viviendas Económicas, de Roma, sobre un terreno de 1.150 m2 cercano al Tíber. Tal proximidad exigió una labor compleja de cimentación, ya que el proyecto determinaba una construcción de once plantas.

  14. Multifractal Analysis of Human Heartbeat in Sleep

    Science.gov (United States)

    Ding, Liang-Jing; Peng, Hu; Cai, Shi-Min; Zhou, Pei-Ling

    2007-07-01

    We study the dynamical properties of heart rate variability (HRV) in sleep by analysing the scaling behaviour with the multifractal detrended fluctuation analysis method. It is well known that heart rate is regulated by the interaction of two branches of the autonomic nervous system: the parasympathetic and sympathetic nervous systems. By investigating the multifractal properties of light, deep, rapid-eye-movement (REM) sleep and wake stages, we firstly find an increasing multifractal behaviour during REM sleep which may be caused by augmented sympathetic activities relative to non-REM sleep. In addition, the investigation of long-range correlations of HRV in sleep with second order detrended fluctuation analysis presents irregular phenomena. These findings may be helpful to understand the underlying regulating mechanism of heart rate by autonomic nervous system during wake-sleep transitions.

  15. Multifractal Analysis of Human Heartbeat in Sleep

    Institute of Scientific and Technical Information of China (English)

    DING Liang-Jing; PENG Hu; CAI Shi-Min; ZHOU Pei-Ling

    2007-01-01

    We study the dynamical properties of heart rate variability (HRV) in sleep by analysing the scaling behaviour with the multifractal detrended fluctuation analysis method. It is well known that heart rate is regulated by the interaction of two branches of the autonomic nervous system: the parasympathetic and sympathetic nervous systems. By investigating the multifractal properties of light, deep, rapid-eye-movement (REM) sleep and wake stages, we firstly find an increasing multifractal behaviour during REM sleep which may be caused by augmented sympathetic activities relative to non-REM sleep. In addition, the investigation of long-range correlations of HRV in sleep with second order detrended fluctuation analysis presents irregular phenomena. These findings may be helpful to understand the underlying regulating mechanism of heart rate by autonomic nervous system during wake-sleep transitions.

  16. Multifractal Framework Based on Blanket Method

    Science.gov (United States)

    Paskaš, Milorad P.; Reljin, Irini S.; Reljin, Branimir D.

    2014-01-01

    This paper proposes two local multifractal measures motivated by blanket method for calculation of fractal dimension. They cover both fractal approaches familiar in image processing. The first two measures (proposed Methods 1 and 3) support model of image with embedded dimension three, while the other supports model of image embedded in space of dimension three (proposed Method 2). While the classical blanket method provides only one value for an image (fractal dimension) multifractal spectrum obtained by any of the proposed measures gives a whole range of dimensional values. This means that proposed multifractal blanket model generalizes classical (monofractal) blanket method and other versions of this monofractal approach implemented locally. Proposed measures are validated on Brodatz image database through texture classification. All proposed methods give similar classification results, while average computation time of Method 3 is substantially longer. PMID:24578664

  17. Deformed symmetries in noncommutative and multifractional spacetimes

    CERN Document Server

    Calcagni, Gianluca

    2016-01-01

    We clarify the relation between noncommutative spacetimes and multifractional geometries where the spacetime dimension changes with the probed scale. In the absence of curvature and comparing the symmetries of both position and momentum space, we show that $\\kappa$-Minkowski spacetime and the commutative multifractional theory with $q$-derivatives are physically inequivalent but they admit several contact points that allow one to describe certain aspects of $\\kappa$-Minkowski noncommutative geometry as a multifractional theory and vice versa. Contrary to previous literature, this result holds without assuming any specific measure for $\\kappa$-Minkowski. More generally, no well-defined $\\star$-product can be constructed from the $q$-theory, although the latter does admit a natural noncommutative extension with a given deformed Poincar\\'e algebra. A similar no-go theorem may be valid for all multiscale theories with factorizable measures. Turning gravity on, we write the algebras of gravitational first-class co...

  18. Refined Multifractal Cross-Correlation Analysis

    CERN Document Server

    Oświȩcimka, Paweł; Forczek, Marcin; Jadach, Stanisław; Kwapień, Jarosław

    2013-01-01

    We propose a modified algorithm - Multifractal Cross-Correlation Analysis (MFCCA) - that is able to consistently identify and quantify multifractal cross-correlations between two time series. Our motivation for introducing this algorithm is that the already existing methods like MF-DXA have serious limitations for most of the signals describing complex natural processes. The principal component of the related improvement is proper incorporation of the sign of fluctuations. We present a broad analysis of the model fractal stochastic processes as well as of the real-world signals and show that MFCCA is a robust tool and allows a reliable quantification of the cross-correlative structure of analyzed processes. We, in particular, analyze a relation between the generalized Hurst exponent and the MFCCA parameter $\\lambda_q$. This relation provides information about the character of potential multifractality in cross-correlations of the processes under study and thus enables selective insight into their dynamics. Us...

  19. Multifractals of investor behavior in stock market

    Science.gov (United States)

    Oh, Gabjin

    2017-07-01

    In this paper, we analyze the nonlinear properties of investor activity using the multifractal detrended fluctuation analysis (MF-DFA) method. Using the aggregated trading volumes of buying, selling, and normalized net investor trading (NIT) to quantify the characteristics of trader behavior in the KOSPI market, we find that the cumulative distribution functions of all NIT time series, except for individual traders, follow a power-law distribution with an exponent in the range of 2.92 ≤ γ ≤ 3.87. To observe the nonlinear features of investor activity, we also calculate the multifractal spectra for the buyer, seller, and NIT data sets and find that a multifractal structure exists in all of the data, regardless of the investor type studied.

  20. Multifractal characteristics of titanium nitride thin films

    Directory of Open Access Journals (Sweden)

    Ţălu Ştefan

    2015-09-01

    Full Text Available The study presents a multi-scale microstructural characterization of three-dimensional (3-D micro-textured surface of titanium nitride (TiN thin films prepared by reactive DC magnetron sputtering in correlation with substrate temperature variation. Topographical characterization of the surfaces, obtained by atomic force microscopy (AFM analysis, was realized by an innovative multifractal method which may be applied for AFM data. The surface micromorphology demonstrates that the multifractal geometry of TiN thin films can be characterized at nanometer scale by the generalized dimensions Dq and the singularity spectrum f(α. Furthermore, to improve the 3-D surface characterization according with ISO 25178-2:2012, the most relevant 3-D surface roughness parameters were calculated. To quantify the 3-D nanostructure surface of TiN thin films a multifractal approach was developed and validated, which can be used for the characterization of topographical changes due to the substrate temperature variation.

  1. Levy Stability Index from Multifractal Spectrum

    CERN Document Server

    Yuan, H B; Lian Shou Liu; Yuan, Hu; Meiling, Yu; Lianshou, Liu

    1999-01-01

    A method for extracting the Levy stability index $\\mu$ from the multi-fractal spectrum $f(\\alpha)$ in high energy multiparticle production is proposed. This index is an important parameter, characterizing the non-linear behaviour of dynamical fluctuations in high energy collisions. Using the random cascading that this method, basing on a linear fit, is consistent with and more accurate than the usual method of fitting the ratio of $q$th to 2nd order multi-fractal (Rényi) dimensions to the Peschanski formula.

  2. Multifractal properties of resistor diode percolation.

    Science.gov (United States)

    Stenull, Olaf; Janssen, Hans-Karl

    2002-03-01

    Focusing on multifractal properties we investigate electric transport on random resistor diode networks at the phase transition between the nonpercolating and the directed percolating phase. Building on first principles such as symmetries and relevance we derive a field theoretic Hamiltonian. Based on this Hamiltonian we determine the multifractal moments of the current distribution that are governed by a family of critical exponents [psi(l)]. We calculate the family [psi(l)] to two-loop order in a diagrammatic perturbation calculation augmented by renormalization group methods.

  3. Classical and advanced stochastic multifractals in geophysics: Lie cascades and multifractional phase transitions

    Energy Technology Data Exchange (ETDEWEB)

    Schertzer, D.; Lovejoy, S. [Univ. Pierre et Marie Curie, Paris (France)

    1995-09-01

    Multifractal techniques and notions are increasingly widely recognized as the most appropriate and straightforward framework within which to analyze and simulate not only the scale dependence of geophysical observables, but also their extreme variability over a wide range of scales. This is particularly the case for cloud fields and their radiative properties. Schertzer first recalled the original scalar framework of turbulent cascades, especially for the modeling and analysis of passive clouds, based on multifractal developments of the Corrsin-Obukhov spectral scaling of scalar variance. These developments are based on the scaling symmetries of the dynamical equations of both the velocity and liquid water density fields. He emphasized the power of straightforward simulation methods based on these physical arguments. Schertzer showed a video displaying a time evolution of multifractal cloud in the framework of universal multifractals. He insisted that with the aid of these tools, there is no real need to took for constructs such as bounded cascades. 6 refs.

  4. Socioeconomic position, gender, and inequalities in self-rated health between Roma and non-Roma in Serbia.

    Science.gov (United States)

    Janevic, Teresa; Jankovic, Janko; Bradley, Elizabeth

    2012-02-01

    Roma experience high levels of discrimination and social exclusion. Our objective was to examine differences in self-rated health (SRH) between Roma and non-Roma in Serbia. Using data from the 2007 Living Standards Measurement Survey in Serbia (n = 14,313), we used binomial regression to estimate the relative risk (RR) of poor (SRH) among Roma (n = 267) relative to non-Roma. We additionally conducted group comparisons of combinations of Romani ethnicity, poverty, and gender, relative to the baseline group of non-Roma males not in poverty. Adjusting for age, Roma were more than twice as likely as non-Roma to report poor SRH (RR = 2.3, 95% Confidence Interval (CI) = 1.8, 2.8). After adjustment for household consumption, employment, and education, the RR was reduced to 1.6 (95% CI = 1.3, 2.0). Romani women, regardless of whether they were living in poverty or not, experienced the greatest risk of poor SRH, with risks relative to non-Roma males not in poverty of 3.2 (95% CI = 2.3, 4.2) and 3.1 (95% CI = 2.4, 4.0), respectively. Roma in Serbia are at increased risk of poor SRH; Romani women experience the greatest burden of poor SRH.

  5. Roma Empowerment and Social Inclusion Through Work-Integrated Learning

    DEFF Research Database (Denmark)

    Eklund Karlsson, Leena; Crondahl, Kristine

    2015-01-01

    The basis for this article was a health promotion program based on participatory action research and work-integrated learning (WIL). Seven Roma people were employed and trained to work as local coordinators to empower the local Roma community by strengthening their participation in society...... and their sense of community, as well as to promote self-led integration. The study aimed to analyze the program from the Roma coordinators’ perspectives, focusing on perceived individual empowerment and perceptions of contribution to the common good and to community empowerment. The findings, based...... on qualitative data, primarily interviews with the Roma coordinators, indicated that the WIL approach, the participatory nature of the program, and the trust and support from the Roma colleagues and non-Roma facilitators were essential for the development of empowerment. Three main themes emerged that portrayed...

  6. I COLEOTTERI TENEBRIONIDI DI ROMA (Coleoptera, Tenebrionidae

    Directory of Open Access Journals (Sweden)

    Simone Fattorini

    2013-10-01

    Full Text Available In base alla revisione dei dati di letteratura e all’esame di circa 2000 esemplari raccolti a Roma dal 1880 ai nostri giorni, è stata accertata la presenza in questa città di 45 specie di Tenebrionidi, ovvero oltre il 26% delle specie e sottospecie di Tenebrionidi note per l’Italia peninsulare. Altre 18 specie, di cui è stato esaminato materiale cartellinato “Roma” o citato di questa città, sono da considerarsi certamente o verosimilmente estranee. 11 specie citate da Gardini (1997 sono rimosse dalla fauna di Roma, mentre ne vengono segnalate per la prima volta altre 29. Di ogni specie sono indicati: i dati riguardanti il materiale esaminato, i dati di letteratura, la distribuzione, l’ecologia, la distribuzione ambientale nella città di Roma. In base all’estensione temporale delle ricerche, l’elenco fornito dovrebbe essere considerato pressoché completo. Specie rare sono B. gigas, B. lethifera, C. atropos, M. tibialis, G. obscurum, S. metallica, Corticues spp. e N. picipes. Per alcune di esse sono noti pochi reperti, prevalentemente di vecchia data. Alcune specie presenti a Roma mostrano una generale rarefazione, anche in ambienti naturali, probabilmente a causa di pressioni antropiche. Specie considerate un tempo comuni a Roma (come T. italica, A. bacarozzo, Gonocephalum spp., O. sabulosum o N. planippennis sono oggi piuttosto rare o localizzate, mentre specie con una più ristretta tolleranza ecologica (come C. atropos, M. tibialis, S. metallica, P. violacea, Corticeus spp. sono probabilmente divenute molto rare o si sono estinte a Roma. Le specie che hanno avuto maggior successo nella colonizzazione degli ambineti urbani sono elementi xerotermofili, o con ampia tolleranza ecologica, come A. luigionii, S. striatus, B. gibba e P. meridianus., specie tipiche di ambienti aperti ed aridi, comuni nei giardini, nei parchi, nei siti archeologici, nelle aree ruderali, ecc. La presenza nella città di queste specie, tuttora

  7. Origins, admixture and founder lineages in European Roma.

    Science.gov (United States)

    Martínez-Cruz, Begoña; Mendizabal, Isabel; Harmant, Christine; de Pablo, Rosario; Ioana, Mihai; Angelicheva, Dora; Kouvatsi, Anastasia; Makukh, Halyna; Netea, Mihai G; Pamjav, Horolma; Zalán, Andrea; Tournev, Ivailo; Marushiakova, Elena; Popov, Vesselin; Bertranpetit, Jaume; Kalaydjieva, Luba; Quintana-Murci, Lluis; Comas, David

    2016-06-01

    The Roma, also known as 'Gypsies', represent the largest and the most widespread ethnic minority of Europe. There is increasing evidence, based on linguistic, anthropological and genetic data, to suggest that they originated from the Indian subcontinent, with subsequent bottlenecks and undetermined gene flow from/to hosting populations during their diaspora. Further support comes from the presence of Indian uniparentally inherited lineages, such as mitochondrial DNA M and Y-chromosome H haplogroups, in a significant number of Roma individuals. However, the limited resolution of most genetic studies so far, together with the restriction of the samples used, have prevented the detection of other non-Indian founder lineages that might have been present in the proto-Roma population. We performed a high-resolution study of the uniparental genomes of 753 Roma and 984 non-Roma hosting European individuals. Roma groups show lower genetic diversity and high heterogeneity compared with non-Roma samples as a result of lower effective population size and extensive drift, consistent with a series of bottlenecks during their diaspora. We found a set of founder lineages, present in the Roma and virtually absent in the non-Roma, for the maternal (H7, J1b3, J1c1, M18, M35b, M5a1, U3, and X2d) and paternal (I-P259, J-M92, and J-M67) genomes. This lineage classification allows us to identify extensive gene flow from non-Roma to Roma groups, whereas the opposite pattern, although not negligible, is substantially lower (up to 6.3%). Finally, the exact haplotype matching analysis of both uniparental lineages consistently points to a Northwestern origin of the proto-Roma population within the Indian subcontinent.

  8. Multifractal vector fields and stochastic Clifford algebra

    Energy Technology Data Exchange (ETDEWEB)

    Schertzer, Daniel, E-mail: Daniel.Schertzer@enpc.fr; Tchiguirinskaia, Ioulia, E-mail: Ioulia.Tchiguirinskaia@enpc.fr [University Paris-Est, Ecole des Ponts ParisTech, Hydrology Meteorology and Complexity HM& Co, Marne-la-Vallée (France)

    2015-12-15

    In the mid 1980s, the development of multifractal concepts and techniques was an important breakthrough for complex system analysis and simulation, in particular, in turbulence and hydrology. Multifractals indeed aimed to track and simulate the scaling singularities of the underlying equations instead of relying on numerical, scale truncated simulations or on simplified conceptual models. However, this development has been rather limited to deal with scalar fields, whereas most of the fields of interest are vector-valued or even manifold-valued. We show in this paper that the combination of stable Lévy processes with Clifford algebra is a good candidate to bridge up the present gap between theory and applications. We show that it indeed defines a convenient framework to generate multifractal vector fields, possibly multifractal manifold-valued fields, based on a few fundamental and complementary properties of Lévy processes and Clifford algebra. In particular, the vector structure of these algebra is much more tractable than the manifold structure of symmetry groups while the Lévy stability grants a given statistical universality.

  9. Deformed symmetries in noncommutative and multifractional spacetimes

    Science.gov (United States)

    Calcagni, Gianluca; Ronco, Michele

    2017-02-01

    We clarify the relation between noncommutative spacetimes and multifractional geometries, two quantum-gravity-related approaches where the fundamental description of spacetime is not given by a classical smooth geometry. Despite their different conceptual premises and mathematical formalisms, both research programs allow for the spacetime dimension to vary with the probed scale. This feature and other similarities led to ask whether there is a duality between these two independent proposals. In the absence of curvature and comparing the symmetries of both position and momentum space, we show that κ -Minkowski spacetime and the commutative multifractional theory with q -derivatives are physically inequivalent but they admit several contact points that allow one to describe certain aspects of κ -Minkowski noncommutative geometry as a multifractional theory and vice versa. Contrary to previous literature, this result holds without assuming any specific measure for κ -Minkowski. More generally, no well-defined ⋆-product can be constructed from the q -theory, although the latter does admit a natural noncommutative extension with a given deformed Poincaré algebra. A similar no-go theorem may be valid for all multiscale theories with factorizable measures. Turning gravity on, we write the algebras of gravitational first-class constraints in the multifractional theories with q - and weighted derivatives and discuss their differences with respect to the deformed algebras of κ -Minkowski spacetime and of loop quantum gravity.

  10. Multifractal vector fields and stochastic Clifford algebra.

    Science.gov (United States)

    Schertzer, Daniel; Tchiguirinskaia, Ioulia

    2015-12-01

    In the mid 1980s, the development of multifractal concepts and techniques was an important breakthrough for complex system analysis and simulation, in particular, in turbulence and hydrology. Multifractals indeed aimed to track and simulate the scaling singularities of the underlying equations instead of relying on numerical, scale truncated simulations or on simplified conceptual models. However, this development has been rather limited to deal with scalar fields, whereas most of the fields of interest are vector-valued or even manifold-valued. We show in this paper that the combination of stable Lévy processes with Clifford algebra is a good candidate to bridge up the present gap between theory and applications. We show that it indeed defines a convenient framework to generate multifractal vector fields, possibly multifractal manifold-valued fields, based on a few fundamental and complementary properties of Lévy processes and Clifford algebra. In particular, the vector structure of these algebra is much more tractable than the manifold structure of symmetry groups while the Lévy stability grants a given statistical universality.

  11. Evidence of multifractality from emerging European stock markets.

    Science.gov (United States)

    Caraiani, Petre

    2012-01-01

    We test for the presence of multifractality in the daily returns of the three most important stock market indices from Central and Eastern Europe, Czech PX, Hungarian BUX and Polish WIG using the Empirical Mode Decomposition based Multifractal Detrended Fluctuation Analysis. We found that the global Hurst coefficient varies with the q coefficient and that there is multifractality evidenced through the multifractal spectrum. The exercise is replicated for the sample around the high volatility period corresponding to the last global financial crisis. Although no direct link has been found between the crisis and the multifractal spectrum, the crisis was found to influence the overall shape as quantified through the norm of the multifractal spectrum.

  12. Evidence of multifractality from emerging European stock markets.

    Directory of Open Access Journals (Sweden)

    Petre Caraiani

    Full Text Available We test for the presence of multifractality in the daily returns of the three most important stock market indices from Central and Eastern Europe, Czech PX, Hungarian BUX and Polish WIG using the Empirical Mode Decomposition based Multifractal Detrended Fluctuation Analysis. We found that the global Hurst coefficient varies with the q coefficient and that there is multifractality evidenced through the multifractal spectrum. The exercise is replicated for the sample around the high volatility period corresponding to the last global financial crisis. Although no direct link has been found between the crisis and the multifractal spectrum, the crisis was found to influence the overall shape as quantified through the norm of the multifractal spectrum.

  13. Multifractal analysis of managed and independent float exchange rates

    Science.gov (United States)

    Stošić, Darko; Stošić, Dusan; Stošić, Tatijana; Stanley, H. Eugene

    2015-06-01

    We investigate multifractal properties of daily price changes in currency rates using the multifractal detrended fluctuation analysis (MF-DFA). We analyze managed and independent floating currency rates in eight countries, and determine the changes in multifractal spectrum when transitioning between the two regimes. We find that after the transition from managed to independent float regime the changes in multifractal spectrum (position of maximum and width) indicate an increase in market efficiency. The observed changes are more pronounced for developed countries that have a well established trading market. After shuffling the series, we find that the multifractality is due to both probability density function and long term correlations for managed float regime, while for independent float regime multifractality is in most cases caused by broad probability density function.

  14. New Suns in the Cosmos III: multifractal signature analysis

    CERN Document Server

    de Freitas, D B; Junior, P R V de Moraes; Lopes, C E F; Leão, I C; Chagas, M L Das; Bravo, J P; Costa, A D; Martins, B L Canto; De Medeiros, J R

    2016-01-01

    In present paper, we investigate the multifractality signatures in hourly time series extracted from CoRoT spacecraft database. Our analysis is intended to highlight the possibility that astrophysical time series can be members of a particular class of complex and dynamic processes which require several photometric variability diagnostics to characterize their structural and topological properties. To achieve this goal, we search for contributions due to nonlinear temporal correlation and effects caused by heavier tails than the Gaussian distribution, using a detrending moving average algorithm for one-dimensional multifractal signals (MFDMA). We observe that the correlation structure is the main source of multifractality, while heavy-tailed distribution plays a minor role in generating the multifractal effects. Our work also reveals that rotation period of stars is inherently scaled by degree of multifractality. As a result, analyzing the multifractal degree of referred series, we uncover an evolution of mul...

  15. Finite-size effect and the components of multifractality in transport economics volatility based on multifractal detrending moving average method

    Science.gov (United States)

    Chen, Feier; Tian, Kang; Ding, Xiaoxu; Miao, Yuqi; Lu, Chunxia

    2016-11-01

    Analysis of freight rate volatility characteristics attracts more attention after year 2008 due to the effect of credit crunch and slowdown in marine transportation. The multifractal detrended fluctuation analysis technique is employed to analyze the time series of Baltic Dry Bulk Freight Rate Index and the market trend of two bulk ship sizes, namely Capesize and Panamax for the period: March 1st 1999-February 26th 2015. In this paper, the degree of the multifractality with different fluctuation sizes is calculated. Besides, multifractal detrending moving average (MF-DMA) counting technique has been developed to quantify the components of multifractal spectrum with the finite-size effect taken into consideration. Numerical results show that both Capesize and Panamax freight rate index time series are of multifractal nature. The origin of multifractality for the bulk freight rate market series is found mostly due to nonlinear correlation.

  16. Generalized binomial multiplicative cascade processes and asymmetrical multifractal distributions

    Science.gov (United States)

    Cheng, Q.

    2014-04-01

    The concepts and models of multifractals have been employed in various fields in the geosciences to characterize singular fields caused by nonlinear geoprocesses. Several indices involved in multifractal models, i.e., asymmetry, multifractality, and range of singularity, are commonly used to characterize nonlinear properties of multifractal fields. An understanding of how these indices are related to the processes involved in the generation of multifractal fields is essential for multifractal modeling. In this paper, a five-parameter binomial multiplicative cascade model is proposed based on the anisotropic partition processes. Each partition divides the unit set (1-D length or 2-D area) into h equal subsets (segments or subareas) and m1 of them receive d1 (> 0) and m2 receive d2 (> 0) proportion of the mass in the previous subset, respectively, where m1+m2 ≤ h. The model is demonstrated via several examples published in the literature with asymmetrical fractal dimension spectra. This model demonstrates the various properties of asymmetrical multifractal distributions and multifractal indices with explicit functions, thus providing insight into and an understanding of the properties of asymmetrical binomial multifractal distributions.

  17. Relationships of exponents in multifractal detrended fluctuation analysis and conventional multifractal analysis

    Institute of Scientific and Technical Information of China (English)

    Zhou Yu; Leung Yee; Yu Zu-Guo

    2011-01-01

    Multifractal detrended fluctuation analysis (MF-DFA) is a relatively new method of multifractal analysis. It is extended from detrended fluctuation analysis (DFA),which was developed for detecting the long-range correlation and the fractal properties in stationary and non-stationary time series. Although MF-DFA has become a widely used method,some relationships among the exponents established in the original paper seem to be incorrect under the general situation. In this paper,we theoretically and experimentally demonstrate the invalidity of the expression τ(q)=qh(q)-1 stipulating the relationship between the multifractal exponent τ(q) and the generalized Hurst exponent h(q). As a replacement,a general relationship is established on the basis of the universal multifractal formalism for the stationary series as τ(q)=qh(q)-qH'-1,where H'is the nonconservation parameter in the universal multifractal formalism. The singular spectra,a and f (a),are also derived according to this new relationship.

  18. Roma Education on the Agenda of the European Union

    Science.gov (United States)

    Jaroka, Livia

    2007-01-01

    The Roma community of Europe continues to face discrimination in a number of areas, notably education, employment, healthcare, and housing. In an increasingly knowledge-based economy, education provides one of the primary tools for escaping the cycle of poverty that traps many Roma families, and therefore it is one of the most pressing issues that…

  19. Institutional Racism? Roma Children, Local Community and School Practices

    Science.gov (United States)

    Zachos, Dimitris

    2012-01-01

    This article tries to discuss the conditions Roma pupils face within the Greek educational system. In the first part, through a brief history of Roma groups in Greece followed by a short analysis of their legal status and leaving conditions, I attempt to present a critical approach in Romani Studies. Thereafter, using Institutional Racism as a…

  20. From Research to Policy: Roma Participation through Communicative Organization

    Science.gov (United States)

    Munte, Ariadna; Serradell, Olga; Sorde, Teresa

    2011-01-01

    For centuries, Roma people's social exclusion has been reinforced through research that has legitimized stereotypes rather than helping to overcome them. This has led Roma people to refuse to participate in the kind of research that has contributed to discrimination against them. We describe how the critical communicative methodology, used in the…

  1. Otherness in Pedagogical Theory and Practice: The Case of Roma

    Science.gov (United States)

    Kirova, Anna; Prochner, Larry

    2015-01-01

    This paper addresses the topic of the inclusion of Roma children in education in Europe through an examination of theory and practice in relation to the issues of Otherness and foreignness. Roma children entering school encounter a vastly different world from their home culture, with different expectations for teaching and learning, for…

  2. Situated Learning in Young Romanian Roma Successful Learning Biographies

    Science.gov (United States)

    Nistor, Nicolae; Stanciu, Dorin; Vanea, Cornelia; Sasu, Virginia Maria; Dragota, Maria

    2014-01-01

    European Roma are often associated with social problems and conflicts due to poverty and low formal education. Nevertheless, Roma communities traditionally develop expertise in ethnically specific domains, probably by alternative, informal ways, such as situated learning in communities of practice. Although predictable, empirical evidence of…

  3. Otherness in Pedagogical Theory and Practice: The Case of Roma

    Science.gov (United States)

    Kirova, Anna; Prochner, Larry

    2015-01-01

    This paper addresses the topic of the inclusion of Roma children in education in Europe through an examination of theory and practice in relation to the issues of Otherness and foreignness. Roma children entering school encounter a vastly different world from their home culture, with different expectations for teaching and learning, for…

  4. Institutional Racism? Roma Children, Local Community and School Practices

    Science.gov (United States)

    Zachos, Dimitris

    2012-01-01

    This article tries to discuss the conditions Roma pupils face within the Greek educational system. In the first part, through a brief history of Roma groups in Greece followed by a short analysis of their legal status and leaving conditions, I attempt to present a critical approach in Romani Studies. Thereafter, using Institutional Racism as a…

  5. Situated Learning in Young Romanian Roma Successful Learning Biographies

    Science.gov (United States)

    Nistor, Nicolae; Stanciu, Dorin; Vanea, Cornelia; Sasu, Virginia Maria; Dragota, Maria

    2014-01-01

    European Roma are often associated with social problems and conflicts due to poverty and low formal education. Nevertheless, Roma communities traditionally develop expertise in ethnically specific domains, probably by alternative, informal ways, such as situated learning in communities of practice. Although predictable, empirical evidence of…

  6. From Research to Policy: Roma Participation through Communicative Organization

    Science.gov (United States)

    Munte, Ariadna; Serradell, Olga; Sorde, Teresa

    2011-01-01

    For centuries, Roma people's social exclusion has been reinforced through research that has legitimized stereotypes rather than helping to overcome them. This has led Roma people to refuse to participate in the kind of research that has contributed to discrimination against them. We describe how the critical communicative methodology, used in the…

  7. Roma Education on the Agenda of the European Union

    Science.gov (United States)

    Jaroka, Livia

    2007-01-01

    The Roma community of Europe continues to face discrimination in a number of areas, notably education, employment, healthcare, and housing. In an increasingly knowledge-based economy, education provides one of the primary tools for escaping the cycle of poverty that traps many Roma families, and therefore it is one of the most pressing issues that…

  8. Roma ethnicity and outcomes of coronary artery disease : Mortality, clinical status and self-rated health

    NARCIS (Netherlands)

    Sudzinova, Adriana

    2015-01-01

    The aim of this thesis was to explore care whether health outcomes differ between Roma and non-Roma patients with coronary artery disease (CAD) undergoing coronary angiography (CAG). We found that Roma had worse outcomes in this case. Roma CAD patients entering specialized cardiologic care already

  9. Roma ethnicity and outcomes of coronary artery disease : Mortality, clinical status and self-rated health

    NARCIS (Netherlands)

    Sudzinova, Adriana

    2015-01-01

    The aim of this thesis was to explore care whether health outcomes differ between Roma and non-Roma patients with coronary artery disease (CAD) undergoing coronary angiography (CAG). We found that Roma had worse outcomes in this case. Roma CAD patients entering specialized cardiologic care already h

  10. Exploring misery discourses: problematized Roma in labour market projects

    Directory of Open Access Journals (Sweden)

    Viktor Vesterberg

    2016-03-01

    Full Text Available The aim of this article is to analyse learning practices in labour market projects cofinanced by the European Social Fund (ESF targeting unemployed Roma in Sweden. The empirical material consists of 18 project descriptions from ESF projects, as well as national and European policy documents concerned with the inclusion of the Roma in contemporary Europe. The contemporary empirical material is analysed in relation to a government report from 1956 concerning the 'Roma issue' in Sweden. The analytical perspective of the study is governmentality, and the analysis focuses on different kinds of problematizations and the discursive positioning of the Roma subjects. One of the main findings is that unemployed Roma are situated in various discourses of misery and constructed as in need of reshaping their subjectivities in order to become educable as well as employable.

  11. Securitarian healing: Roma mobility and health care in Rome.

    Science.gov (United States)

    Alunni, Lorenzo

    2015-01-01

    Over the last decade, Roma populations in Europe have been the object of strict securitarian policies. The Rome case is particularly interesting due to the continued shift from securitarian to humanitarian discourses and actions led by local institutions. The specific health care system implemented in the legal and illegal Roma camps was one of the tools used. The ethnographic fieldwork behind this article involved following the daily activities of a mobile medical unit dedicated to Roma camps in Rome and monitoring a health care project led by a nongovernmental organization. This analysis focuses on one particular dimension of precarious forms of Roma citizenship that the health care policies have developed to address Roma issues: the international mobility dynamics relating to health issues, which drive subjects into a forced integration of multiple, incomplete, and fragmentary medical approaches.

  12. Collective identity and wellbeing of Roma minority adolescents in Bulgaria.

    Science.gov (United States)

    Dimitrova, Radosveta; Chasiotis, Athanasios; Bender, Michael; van de Vijver, Fons

    2013-01-01

    In Europe and particularly in Bulgaria, Roma represent the largest low-status minority group that is subjected to marked public intolerance and discrimination. This study examined links among Roma (N = 207) and Bulgarian (N = 399) adolescents' ethnic, familial, and religious identities as salient identity aspects for their psychological wellbeing. Results indicated that, as expected, Roma youth reported lower levels of wellbeing than Bulgarian youth. The latter revealed a weaker religious identity than Roma youth, whereas no ethnic group differences emerged regarding Bulgarian or familial identity. Furthermore, we observed that collective identity was higher in older participants of both groups. Finally, a multigroup analysis using structural equation modeling showed that collective identity was a positive predictor of wellbeing for both Roma and Bulgarian adolescents. Findings demonstrated differences in salience as well as structural communalities regarding ways in which collective identity affects wellbeing of youth from two ethnically diverse communities.

  13. Particle-physics constraints on multifractal spacetimes

    CERN Document Server

    Calcagni, Gianluca; Rodríguez-Fernández, David

    2016-01-01

    We study electroweak interactions in the multiscale theory with $q$-derivatives, a framework where spacetime has the typical features of a multifractal. In the simplest case with only one characteristic time, length and energy scale $t_*$, $\\ell_*$, and $E_*$, we consider (i) the muon decay rate and (ii) the Lamb shift in the hydrogen atom, and constrain the corrections to the ordinary results. We obtain the independent absolute upper bounds (i) $t_* 35\\,\\text{MeV}$. Under some mild theoretical assumptions, the Lamb shift alone yields the even tighter ranges $t_*450\\,\\text{GeV}$. To date, these are the first robust constraints on the scales at which the multifractal features of the geometry can become important in a physical process.

  14. A multifractal formalism for countable alphabet subshifts

    Energy Technology Data Exchange (ETDEWEB)

    Meson, Alejandro [Instituto de Fisica de Liquidos y Sistemas Biologicos (IFLYSIB), CONICET-UNLP-CICPBA and Grupo de Aplicaciones Matematicas y Estadisticas de la Facultad de Ingenieria (GAMEFI) UNLP, La Plata (Argentina)], E-mail: vericat@gw-iflysib.iflysib.unlp.edu.ar; Vericat, Fernando [Instituto de Fisica de Liquidos y Sistemas Biologicos (IFLYSIB), CONICET-UNLP-CICPBA and Grupo de Aplicaciones Matematicas y Estadisticas de la Facultad de Ingenieria (GAMEFI) UNLP, La Plata (Argentina)], E-mail: meson@iflysib.unlp.edu.ar

    2009-01-15

    We study here the multifractal spectrum of local entropies for subshifts with an infinite alphabet. The description of this spectrum is obtained from the Legendre transform of a free energy map and Gibbs states associated with adequate potentials. The lack of compactness in the symbolic space necessitates modifications to the description for the compact case, i.e. for finite alphabet. In particular, the class of potentials must be restricted to a narrower one than that considered for the compact case.

  15. Multifractal properties of ball milling dynamics

    Energy Technology Data Exchange (ETDEWEB)

    Budroni, M. A., E-mail: mabudroni@uniss.it; Pilosu, V.; Rustici, M. [Dipartimento di Chimica e Farmacia, Università degli Studi di Sassari, Via Vienna 2, Sassari 07100 (Italy); Delogu, F. [Dipartimento di Ingegneria Meccanica, Chimica, e dei Materiali, Università degli Studi di Cagliari, via Marengo 2, Cagliari 09123 (Italy)

    2014-06-15

    This work focuses on the dynamics of a ball inside the reactor of a ball mill. We show that the distribution of collisions at the reactor walls exhibits multifractal properties in a wide region of the parameter space defining the geometrical characteristics of the reactor and the collision elasticity. This feature points to the presence of restricted self-organized zones of the reactor walls where the ball preferentially collides and the mechanical energy is mainly dissipated.

  16. Multifractal properties of ball milling dynamics

    Energy Technology Data Exchange (ETDEWEB)

    Budroni, M. A., E-mail: mabudroni@uniss.it; Pilosu, V.; Rustici, M. [Dipartimento di Chimica e Farmacia, Università degli Studi di Sassari, Via Vienna 2, Sassari 07100 (Italy); Delogu, F. [Dipartimento di Ingegneria Meccanica, Chimica, e dei Materiali, Università degli Studi di Cagliari, via Marengo 2, Cagliari 09123 (Italy)

    2014-06-15

    This work focuses on the dynamics of a ball inside the reactor of a ball mill. We show that the distribution of collisions at the reactor walls exhibits multifractal properties in a wide region of the parameter space defining the geometrical characteristics of the reactor and the collision elasticity. This feature points to the presence of restricted self-organized zones of the reactor walls where the ball preferentially collides and the mechanical energy is mainly dissipated.

  17. Forecasting Urban Water Demand via Machine Learning Methods Coupled with a Bootstrap Rank-Ordered Conditional Mutual Information Input Variable Selection Method

    Science.gov (United States)

    Adamowski, J. F.; Quilty, J.; Khalil, B.; Rathinasamy, M.

    2014-12-01

    This paper explores forecasting short-term urban water demand (UWD) (using only historical records) through a variety of machine learning techniques coupled with a novel input variable selection (IVS) procedure. The proposed IVS technique termed, bootstrap rank-ordered conditional mutual information for real-valued signals (brCMIr), is multivariate, nonlinear, nonparametric, and probabilistic. The brCMIr method was tested in a case study using water demand time series for two urban water supply system pressure zones in Ottawa, Canada to select the most important historical records for use with each machine learning technique in order to generate forecasts of average and peak UWD for the respective pressure zones at lead times of 1, 3, and 7 days ahead. All lead time forecasts are computed using Artificial Neural Networks (ANN) as the base model, and are compared with Least Squares Support Vector Regression (LSSVR), as well as a novel machine learning method for UWD forecasting: the Extreme Learning Machine (ELM). Results from one-way analysis of variance (ANOVA) and Tukey Honesty Significance Difference (HSD) tests indicate that the LSSVR and ELM models are the best machine learning techniques to pair with brCMIr. However, ELM has significant computational advantages over LSSVR (and ANN) and provides a new and promising technique to explore in UWD forecasting.

  18. Predictors of health-endangering behaviour among Roma and non-Roma adolescents in Slovakia by gender

    NARCIS (Netherlands)

    Kolarcik, P.; Geckova, A. M.; Orosova, O.; van Dijk, J. P.; Reijneveld, S. A.

    2010-01-01

    Background Roma people are commonly described as having an unhealthy lifestyled-for example, an unhealthy diet, intensive smoking, frequent alcohol consumption and a lack of physical activity. However, data about such health-endangering behaviours among Roma adolescents are scarce and of poor

  19. Does the influence of peers and parents on adolescents' drunkenness differ between Roma and non-Roma adolescents in Slovakia?

    NARCIS (Netherlands)

    Bobakova, D.; Kolarcik, P.; Madarasova-Geckova, A.; Klein, D.; Reijneveld, S.A.; van Dijk, J.P.

    2012-01-01

    Background. Roma adolescents have been shown to use less alcohol than non-Roma adolescents. This could be due to the protective influences of peers and parents. Objective. The purpose of this study was to explore differences in the levels of peer and parental influence and their effects on

  20. Does the influence of peers and parents on adolescents' drunkenness differ between Roma and non-Roma adolescents in Slovakia?

    NARCIS (Netherlands)

    Bobakova, D.; Kolarcik, P.; Madarasova-Geckova, A.; Klein, D.; Reijneveld, S.A.; van Dijk, J.P.

    2012-01-01

    Background. Roma adolescents have been shown to use less alcohol than non-Roma adolescents. This could be due to the protective influences of peers and parents. Objective. The purpose of this study was to explore differences in the levels of peer and parental influence and their effects on drunkenne

  1. Predictors of health-endangering behaviour among Roma and non-Roma adolescents in Slovakia by gender

    NARCIS (Netherlands)

    Kolarcik, P.; Geckova, A. M.; Orosova, O.; van Dijk, J. P.; Reijneveld, S. A.

    2010-01-01

    Background Roma people are commonly described as having an unhealthy lifestyled-for example, an unhealthy diet, intensive smoking, frequent alcohol consumption and a lack of physical activity. However, data about such health-endangering behaviours among Roma adolescents are scarce and of poor qualit

  2. Complex multifractal nature in Mycobacterium tuberculosis genome

    Science.gov (United States)

    Mandal, Saurav; Roychowdhury, Tanmoy; Chirom, Keilash; Bhattacharya, Alok; Brojen Singh, R. K.

    2017-04-01

    The mutifractal and long range correlation (C(r)) properties of strings, such as nucleotide sequence can be a useful parameter for identification of underlying patterns and variations. In this study C(r) and multifractal singularity function f(α) have been used to study variations in the genomes of a pathogenic bacteria Mycobacterium tuberculosis. Genomic sequences of M. tuberculosis isolates displayed significant variations in C(r) and f(α) reflecting inherent differences in sequences among isolates. M. tuberculosis isolates can be categorised into different subgroups based on sensitivity to drugs, these are DS (drug sensitive isolates), MDR (multi-drug resistant isolates) and XDR (extremely drug resistant isolates). C(r) follows significantly different scaling rules in different subgroups of isolates, but all the isolates follow one parameter scaling law. The richness in complexity of each subgroup can be quantified by the measures of multifractal parameters displaying a pattern in which XDR isolates have highest value and lowest for drug sensitive isolates. Therefore C(r) and multifractal functions can be useful parameters for analysis of genomic sequences.

  3. Probing Tissue Multifractality Using Wavelet based Multifractal Detrended Fluctuation Analysis: Applications in Precancer Detection

    CERN Document Server

    Soni, Jalpa; Ghosh, Sayantan; Pradhan, Asima; Sengupta, Tapas K; Panigrahi, Prasanta K; Ghosh, Nirmalya

    2011-01-01

    The refractive index fluctuations in the connective tissue layer (stroma) of human cervical tissues having different grades of precancers (dysplasia) was quantified using a wavelet-based multifractal detrended fluctuation analysis model. The results show clear signature of multi-scale self-similarity in the index fluctuations of the tissues. Importantly, the refractive index fluctuations were found to be more anti-correlated at higher grades of precancers. Moreover, the strength of multifractality was also observed to be considerably weaker in higher grades of precancers. These results were further complemented by Fourier domain analysis of the spectral fluctuations.

  4. Viaducto Olímpico de Roma

    Directory of Open Access Journals (Sweden)

    Nervi, P. L.

    1962-10-01

    Full Text Available Con motivo de la última olimpíada, celebrada en Roma (Italia, se tuvo que hacer frente al problema que presentaban los transportes y comunicaciones. El acceso a esta zona olímpica, además de no ser suficiente, necesitaba de vías que encauzaran el tráfico y se prestasen a absorber el volumen del mismo, que con motivo de reuniones deportivas se crea, y como complemento ulterior, dotar de accesos permanentes a esta zona que debía ser aprovechada después de estos cometidos como una amplia extensión residencial.

  5. The origin of an increasing or decreasing multifractal spectrum.

    NARCIS (Netherlands)

    Opheusden, van J.H.J.

    1998-01-01

    The multifractal dimensionality Dq as a function of q expresses the distribution of measure over space. When all the moments scale with resolution in exactly the same way, we have a flat spectrum, and a single monofractal dimensionality. We argue that for multifractal spectra the scaling of the

  6. Econophysics vs Cardiophysics: the Dual Face of Multifractality

    NARCIS (Netherlands)

    Struzik, Z.R.

    2003-01-01

    Multifractality in physiological time series and notably in human adult heart rate has been primarily attributed to the Fourier phase ordering of the signal [1]. In contrast, the primary cause for the width of the multifractal spectrum in financial time series has recently been connected with fat-ta

  7. Multifractal analysis of sentence lengths in English literary texts

    CERN Document Server

    Grabska-Gradzińska, Iwona; Kwapień, Jarosław; Oświ\\kecimka, Paweł; Drożdż, Stanisław

    2012-01-01

    This paper presents analysis of 30 literary texts written in English by different authors. For each text, there were created time series representing length of sentences in words and analyzed its fractal properties using two methods of multifractal analysis: MFDFA and WTMM. Both methods showed that there are texts which can be considered multifractal in this representation but a majority of texts are not multifractal or even not fractal at all. Out of 30 books, only a few have so-correlated lengths of consecutive sentences that the analyzed signals can be interpreted as real multifractals. An interesting direction for future investigations would be identifying what are the specific features which cause certain texts to be multifractal and other to be monofractal or even not fractal at all.

  8. Assessment of petrophysical quantities inspired by joint multifractal approach

    CERN Document Server

    Lai, Z Koohi; Jafari, G R

    2015-01-01

    In this paper joint multifractal random walk approach is carried out to analyze some petrophysical quantities for characterizing the petroleum reservoir. These quantities include Gamma emission (GR), sonic transient time (DT) and Neutron porosity (NPHI) which are collected from four wells of a reservoir. To quantify mutual interaction of petrophysical quantities, joint multifractal random walk is implemented. This approach is based on the mutual multiplicative cascade notion in the multifractal formalism and in this approach $L_0$ represents a benchmark to describe the nature of cross-correlation between two series. The analysis of the petrophysical quantities revealed that GR for all wells has strongly multifractal nature due to the considerable abundance of large fluctuations in various scales. The variance of probability distribution function, $\\lambda_{\\ell}^2$, at scale $\\ell$ and its intercept determine the multifractal properties of the data sets sourced by probability density function. The value of $\\...

  9. Multifractal to monofractal evolution of the London's street network

    CERN Document Server

    Murcio, Roberto; Arcaute, Elsa; Batty, Michael

    2015-01-01

    We perform a multifractal analysis of the evolution of London's street network from 1786 to 2010. First, we show that a single fractal dimension, commonly associated with the morphological description of cities, does not su ce to capture the dynamics of the system. Instead, for a proper characterization of such a dynamics, the multifractal spectrum needs to be considered. Our analysis reveals that London evolves from an inhomogeneous fractal structure, that can be described in terms of a multifractal, to a homogeneous one, that converges to monofractality. We argue that London's multifractal to monofracal evolution might be a special outcome of the constraint imposed on its growth by a green belt. Through a series of simulations, we show that multifractal objects, constructed through di usion limited aggregation, evolve towards monofractality if their growth is constrained by a non-permeable boundary.

  10. Reconstructing Roma history from genome-wide data.

    Directory of Open Access Journals (Sweden)

    Priya Moorjani

    Full Text Available The Roma people, living throughout Europe and West Asia, are a diverse population linked by the Romani language and culture. Previous linguistic and genetic studies have suggested that the Roma migrated into Europe from South Asia about 1,000-1,500 years ago. Genetic inferences about Roma history have mostly focused on the Y chromosome and mitochondrial DNA. To explore what additional information can be learned from genome-wide data, we analyzed data from six Roma groups that we genotyped at hundreds of thousands of single nucleotide polymorphisms (SNPs. We estimate that the Roma harbor about 80% West Eurasian ancestry-derived from a combination of European and South Asian sources-and that the date of admixture of South Asian and European ancestry was about 850 years before present. We provide evidence for Eastern Europe being a major source of European ancestry, and North-west India being a major source of the South Asian ancestry in the Roma. By computing allele sharing as a measure of linkage disequilibrium, we estimate that the migration of Roma out of the Indian subcontinent was accompanied by a severe founder event, which appears to have been followed by a major demographic expansion after the arrival in Europe.

  11. Reconstructing Roma History from Genome-Wide Data

    Science.gov (United States)

    Moorjani, Priya; Patterson, Nick; Loh, Po-Ru; Lipson, Mark; Kisfali, Péter; Melegh, Bela I.; Bonin, Michael; Kádaši, Ľudevít; Rieß, Olaf; Berger, Bonnie; Reich, David; Melegh, Béla

    2013-01-01

    The Roma people, living throughout Europe and West Asia, are a diverse population linked by the Romani language and culture. Previous linguistic and genetic studies have suggested that the Roma migrated into Europe from South Asia about 1,000–1,500 years ago. Genetic inferences about Roma history have mostly focused on the Y chromosome and mitochondrial DNA. To explore what additional information can be learned from genome-wide data, we analyzed data from six Roma groups that we genotyped at hundreds of thousands of single nucleotide polymorphisms (SNPs). We estimate that the Roma harbor about 80% West Eurasian ancestry–derived from a combination of European and South Asian sources–and that the date of admixture of South Asian and European ancestry was about 850 years before present. We provide evidence for Eastern Europe being a major source of European ancestry, and North-west India being a major source of the South Asian ancestry in the Roma. By computing allele sharing as a measure of linkage disequilibrium, we estimate that the migration of Roma out of the Indian subcontinent was accompanied by a severe founder event, which appears to have been followed by a major demographic expansion after the arrival in Europe. PMID:23516520

  12. Obesity and body size perceptions in a Spanish Roma population.

    Science.gov (United States)

    Poveda, Alaitz; Ibáñez, María Eugenia; Rebato, Esther

    2014-01-01

    Roma people are particularly vulnerable to developing overweight and obesity. Self-perception of body image may influence the prevalence of obesity in this ethnic minority. The objectives of this study are to estimate the prevalence of obesity, to analyse body size perceptions and preferences and to assess the relationship between body size perceptions and obesity in the Roma population. The analyses were carried out on 372 men, women and children from the Roma population residing in the Greater Bilbao region (Basque Country, Spain). In adults, a standard figural scale was used to analyse body size perceptions and preferences in this ethnic minority. Overall 51.7% of adult and 24.4% of minor Roma individuals were obese. Both Roma men and women had inaccurate self-perceptions of their body size. Significant differences on body size perceptions were detected based on age, sex, nutritional status and socioeconomic characteristics. This Roma population presents one of the highest rates of obesity worldwide. Although a certain awareness of the correct weight status was appreciated, the inability of Roma individuals to see themselves as overweight or obese may be a significant factor on the high prevalence of obesity in this population.

  13. Prevalence of URAT1 allelic variants in the Roma population.

    Science.gov (United States)

    Stiburkova, Blanka; Gabrikova, Dana; Čepek, Pavel; Šimek, Pavel; Kristian, Pavol; Cordoba-Lanus, Elizabeth; Claverie-Martin, Felix

    2016-12-01

    The Roma represents a transnational ethnic group, with a current European population of 8-10 million. The evolutionary process that had the greatest impact on the gene pool of the Roma population is called the founder effect. Renal hypouricemia (RHUC) is a rare heterogenous inherited disorder characterized by impaired renal urate reabsorption. The affected individuals are predisposed to recurrent episodes of exercise-induced nonmyoglobinuric acute kidney injury and nephrolithiasis. To date, more than 150 patients with a loss-of-function mutation for the SLC22A12 (URAT1) gene have been found, most of whom are Asians. However, RHUC 1 patients have been described in a variety of ethnic groups (e.g., Arab Israelis, Iraqi Jews, Caucasians, and Roma) and in geographically noncontiguous countries. This study confirms our previous findings regarding the high frequency of SLC22A12 variants observed. Frequencies of the c.1245_1253del and c.1400C>T variants were found to be 1.92% and 5.56%, respectively, in a subgroup of the Roma population from five regions in three countries: Slovakia, Czech Republic, and Spain. Our findings suggested that the common dysfunction allelic variants of URAT1 exist in the general Roma population and thus renal hypouricemia should be kept in differential diagnostic algorithm on Roma patients with defect in renal tubular urate transport. This leads to confirm that the genetic drift in the Roma have increased the prevalence of hereditary disorders caused by very rare variants in major population.

  14. The connections between postural reactions, scoliosis postures and scoliosis in girls aged 12-15 years old examined using the Spearman’s Rank OrderCorrelation

    Directory of Open Access Journals (Sweden)

    Wilczyński Jacek

    2016-06-01

    Full Text Available The aim of the research was to analyse the Spearman's Rank Order Correlation between the postural reactions, scoliosis postures and scoliosis in girls aged 12-15 years old. Throughout the whole group of girls, positive correlations between attitude parameters in the frontal plane and the postural reactions were observed: The angle of primary curvature/anteroposterior speed with which eyes closed, angle of primary curvature /average speed with which eyes closed, angle of primary curvature /path length eyes closed, absolute value shoulders angle line/mean loading point X eyes closed, absolute value pelvic inclination angle/lateral speed eyes closed. Negative correlations occurred in cases: absolute value angle of secondary curvature/ mean loading point X eyes open, depth of secondary curvature/mean loading point X eyes open, length of secondary curvature/mean loading point X eyes open, angle of secondary curvature/mean loading point X eyes closed. Statistically significant correlations occurred more frequent when the Romberg’s test was held with eyes closed (CE: angle of primary curvature/anteroposterior speed, torso inclination angle/mean loading point X, angle of primary curvature/average speed, angle of primary curvature/path length, absolute value shoulders angle line/mean loading point X, absolute value pelvic inclination angle/ lateral speed, angle of secondary curvature/mean loading point Y. Among the correlations with eyes closed six were positive: angle of primary curvature/anteroposterior speed, torso inclination angle/mean loading point X, angle of primary curvature/ average speed, angle of primary curvature/ path length, absolute value shoulders angle line/mean loading point X, absolute value pelvic inclination angle/lateral speed, and one was negative: angle of secondary curvature/ mean loading point Y. Among the correlations with eyes open (OE only three negative correlations occurred: absolute value angle of secondary curvature

  15. Multifractal Scaling of Grayscale Patterns: Lacunarity and Correlation Dimension

    Science.gov (United States)

    Roy, A.; Perfect, E.

    2012-12-01

    While fractal models can characterize self-similarity in binary fields, comprised solely of 0's and 1's, the concept of multifractals is needed to quantify scaling behavior in non-binary grayscale fields made up of fractional values. Multifractals are characterized by a spectrum of non-integer dimensions, Dq (-∞ lacunarity, L, which characterizes the distribution of gaps or spaces in patterns, fractals, multifractals or otherwise, as a function of scale (or box-size, x). In the case of 2-dimensional multifractal fields, L has been shown to be theoretically related to the correlation dimension, D2, by dlog(L)/dlog(x) = D2 - 2. Therefore, it is hypothesized that lacunarity analysis can help in delineating multifractal behavior in grayscale patterns. In testing this hypothesis, a set of 2-dimensional multifractal grayscale patterns was generated with known D2 values, and then analyzed for lacunarity by employing the gliding-box algorithm. The D2 values computed using this analysis gave a 1:1 relationship with the known D2 values, thus empirically validating the theoretical relationship between L and D2. Lacunarity analysis was further used to evaluate the multifractal nature of natural grayscale images in the form of soil thin sections that had been previously classified as multifractals based on the standard box counting method. The results indicated that lacunarity analysis is a more sensitive indicator of multifractal behavior in natural grayscale patterns than the box counting approach. A weighted mean of the log-transformed lacunarity values at different scales was employed for differentiating between grayscale patterns with various degrees of scale dependent clustering attributes. This new measure, which expresses lacunarity as a single number, should prove useful to researchers who want to explore the correlative influence of texture on, for instance, flow and transport parameters. The advantage of using lacunarity instead of D2 in this context is that it can

  16. Genetic structure of the paternal lineage of the Roma people.

    Science.gov (United States)

    Pamjav, Horolma; Zalán, Andrea; Béres, Judit; Nagy, Melinda; Chang, Yuet Meng

    2011-05-01

    According to written sources, Roma (Romanies, Gypsies) arrived in the Balkans around 1,000 years ago from India and have subsequently spread through several parts of Europe. Genetic data, particularly from the Y chromosome, have supported this model, and can potentially refine it. We now provide an analysis of Y-chromosomal markers from five Roma and two non-Roma populations (N = 787) in order to investigate the genetic relatedness of the Roma population groups to one another, and to gain further understanding of their likely Indian origins, the genetic contribution of non-Roma males to the Roma populations, and the early history of their splits and migrations in Europe. The two main sources of the Roma paternal gene pool were identified as South Asian and European. The reduced diversity and expansion of H1a-M82 lineages in all Roma groups imply shared descent from a single paternal ancestor in the Indian subcontinent. The Roma paternal gene pool also contains a specific subset of E1b1b1a-M78 and J2a2-M67 lineages, implying admixture during early settlement in the Balkans and the subsequent influx into the Carpathian Basin. Additional admixture, evident in the low and moderate frequencies of typical European haplogroups I1-M253, I2a-P37.2, I2b-M223, R1b1-P25, and R1a1-M198, has occurred in a more population-specific manner.

  17. Multifractal age? Multifractal analysis of cardiac interbeat intervals in assessing of healthy aging

    CERN Document Server

    Makowiec, Danuta; Wdowczyk-Szulc, Joanna; Zarczynska-Buchowiecka, Marta; Gruchal, Marcin; Rynkiewicz, Andrzej

    2013-01-01

    24-hour Holter recordings of 124 healthy people at different age are studied. The nocturnal signals of young people reveal the presence of the multiplicative structure. This structure is significantly weaker in diurnal signals and becomes less evident for elderly people. Multifractal analysis allows us to propose qualitative and quantitative methods to estimate the advancement of the aging process for healthy humans.

  18. Contraceptive Attitudes and Practices in the Roma Communities

    Directory of Open Access Journals (Sweden)

    Raluca Zanca

    2009-12-01

    Full Text Available The process of adopting a contraceptive behaviour is determined by a series of factors, having a slow progress in time. The use of birth control methods by the Roma women is influenced by a series of specific elements. This article wants to highlight an image containing the degree in which the Roma women are aware of the birth control methods and family planning. To this end, I have used the technique of group interview. In the first stage I applied a number of group interviews on the Roma women from the Gîrcin community. Afterwards I examined the interviews using inductive analysis. The results were grouped into thematic categories.

  19. Historia del Pensamiento Político Premoderno 06 Roma

    OpenAIRE

    Sanz Díaz, Benito, 1949

    2010-01-01

    Tema 6 Roma, Republica e Imperio La Monarquía romana. 753-510 adC La Republica romana. 509 a 27 adC 1. La Ley de las XII Tablas, Lex duodecim tabularum 2. Magistraturas y magistrados en el sistema republicano de Roma. El Consulado. Legatus. El Pretor. Los censores. La Dictadura. Decenviros. Cuestores. Ediles. Tribunos de la plebe 3. El Senado 4. Triunvirato 5. Los protagonistas del último siglo republicano 6. El final de una época 7. ¿Por qué Roma pasó de Repu...

  20. Roma coronary heart disease patients have more medical risk factors and greater severity of coronary heart disease than non-Roma

    NARCIS (Netherlands)

    Sudzinova, A.; Nagyova, I.; Studencan, M.; Rosenberger, J.; Skodova, Z.; Vargova, H.; Middel, B.; Reijneveld, S. A.; van Dijk, J. P.

    Coronary heart disease (CHD) is the most common cause of mortality and morbidity world-wide. Evidence on ethnic differences between the Roma and non-Roma regarding medical risk factors is scarce. The aim of this study was to assess differences in medical risk factors and the severity of CHD in Roma

  1. Delinquent and Aggressive Behavior and Social Desirability Among Roma and Non-Roma Adolescents in Slovakia : A Cross-Sectional Study

    NARCIS (Netherlands)

    Kolarcik, Peter; Geckova, Andrea Madarasova; Reijneveld, Sijmen A.; van Dijk, Jitse P.

    Rates of aggression and delinquency are assumed to be higher among Roma and other minorities, but sound evidence of this is lacking. Our aim was to assess delinquent and aggressive behavior among Roma and non-Roma adolescents and the effects on ethnic differences of parental education and social

  2. Roma coronary heart disease patients have more medical risk factors and greater severity of coronary heart disease than non-Roma.

    Science.gov (United States)

    Sudzinova, A; Nagyova, I; Studencan, M; Rosenberger, J; Skodova, Z; Vargova, H; Middel, B; Reijneveld, S A; van Dijk, J P

    2013-06-01

    Coronary heart disease (CHD) is the most common cause of mortality and morbidity world-wide. Evidence on ethnic differences between the Roma and non-Roma regarding medical risk factors is scarce. The aim of this study was to assess differences in medical risk factors and the severity of CHD in Roma compared with non-Roma CHD patients, adjusted for gender, age and education. Six hundred seventy four patients were included in this cross-sectional study (132 Roma, 542 non-Roma). Data on medical risk factors, symptoms, medication and severity of CHD were obtained from medical records. After matching Roma and non-Roma according to education, linear and logistic regression analyses with adjustments for gender and age were used. Compared with non-Roma, Roma patients had significantly more risk factors and more severe types of CHD. They were treated less frequently with statins and beta-blockers, were more frequently left on pharmacotherapy and surgically revascularised. These differences remained after controlling for education, gender and age. Roma CHD patients have a worse risk profile at entry of care and seem to be undertreated compared with non-Roma CHD patients.

  3. Delinquent and Aggressive Behavior and Social Desirability Among Roma and Non-Roma Adolescents in Slovakia : A Cross-Sectional Study

    NARCIS (Netherlands)

    Kolarcik, Peter; Geckova, Andrea Madarasova; Reijneveld, Sijmen A.; van Dijk, Jitse P.

    2016-01-01

    Rates of aggression and delinquency are assumed to be higher among Roma and other minorities, but sound evidence of this is lacking. Our aim was to assess delinquent and aggressive behavior among Roma and non-Roma adolescents and the effects on ethnic differences of parental education and social des

  4. Roma coronary heart disease patients have more medical risk factors and greater severity of coronary heart disease than non-Roma

    NARCIS (Netherlands)

    Sudzinova, A.; Nagyova, I.; Studencan, M.; Rosenberger, J.; Skodova, Z.; Vargova, H.; Middel, B.; Reijneveld, S. A.; van Dijk, J. P.

    2013-01-01

    Coronary heart disease (CHD) is the most common cause of mortality and morbidity world-wide. Evidence on ethnic differences between the Roma and non-Roma regarding medical risk factors is scarce. The aim of this study was to assess differences in medical risk factors and the severity of CHD in Roma

  5. The role of the Vlax Roma in shaping the European Romani maternal genetic history.

    Science.gov (United States)

    Salihović, Marijana Peričić; Barešić, Ana; Klarić, Irena Martinović; Cukrov, Slavena; Lauc, Lovorka Barać; Janićijević, Branka

    2011-10-01

    The Roma are comprised of many founder groups of common Indian origins but different socio-cultural characteristics. The Vlax Roma are one of the founder Roma populations characterized by a period of bondage in the historic Romanian principalities, and by the archaic Romanian language. Demographic history suggests different migration routes of Roma populations, especially after their arrival in Mesopotamia and the eastern boundary of the Byzantine Empire. Although various genetic studies of uniparental genetic markers showed a connection between Roma genetic legacy and their migration routes, precise sampling of Roma populations elucidates this relationship in more detail. In this study, we analyzed mitochondrial DNA of 384 Croatian Vlax Roma from two geographic locations in the context of 734 European Roma samples. Our results show that Roma migration routes are marked with two Near-Eastern haplogroups, X2 and U3, whose inverse proportional incidence clearly separates the Balkan and the Vlax Roma from other Roma populations that reached Europe as part of the first migration wave. Spatial and temporal characteristics of these haplogroups indicate a possibility of their admixture with Roma populations before arrival in Europe. Distribution of haplogroup M35 indicates that all Vlax Roma populations descend from one single founder population that might even reach back to the original ancestral Indian population. Founder effects followed by strict endogamy rules can be traced from India to contemporary small, local communities, as in the case of two Croatian Vlax Roma populations that show clear population differentiation despite similar origins and shared demographic history.

  6. Multifractal modelling and 3D lacunarity analysis

    Energy Technology Data Exchange (ETDEWEB)

    Hanen, Akkari, E-mail: bettaieb.hanen@topnet.t [Laboratoire de biophysique, TIM, Faculte de Medecine (Tunisia); Imen, Bhouri, E-mail: bhouri_imen@yahoo.f [Unite de recherche ondelettes et multifractals, Faculte des sciences (Tunisia); Asma, Ben Abdallah, E-mail: asma.babdallah@cristal.rnu.t [Laboratoire de biophysique, TIM, Faculte de Medecine (Tunisia); Patrick, Dubois, E-mail: pdubois@chru-lille.f [INSERM, U 703, Lille (France); Hedi, Bedoui Mohamed, E-mail: medhedi.bedoui@fmm.rnu.t [Laboratoire de biophysique, TIM, Faculte de Medecine (Tunisia)

    2009-09-28

    This study presents a comparative evaluation of lacunarity of 3D grey level models with different types of inhomogeneity. A new method based on the 'Relative Differential Box Counting' was developed to estimate the lacunarity features of grey level volumes. To validate our method, we generated a set of 3D grey level multifractal models with random, anisotropic and hierarchical properties. Our method gives a lacunarity measurement correlated with the theoretical one and allows a better model classification compared with a classical approach.

  7. Multifractal modelling and 3D lacunarity analysis

    Science.gov (United States)

    Hanen, Akkari; Imen, Bhouri; Asma, Ben Abdallah; Patrick, Dubois; Hédi, Bedoui Mohamed

    2009-09-01

    This study presents a comparative evaluation of lacunarity of 3D grey level models with different types of inhomogeneity. A new method based on the “Relative Differential Box Counting” was developed to estimate the lacunarity features of grey level volumes. To validate our method, we generated a set of 3D grey level multifractal models with random, anisotropic and hierarchical properties. Our method gives a lacunarity measurement correlated with the theoretical one and allows a better model classification compared with a classical approach.

  8. Multifractal cross-correlation analysis in electricity spot market

    Science.gov (United States)

    Fan, Qingju; Li, Dan

    2015-07-01

    In this paper, we investigate the multiscale cross-correlations between electricity price and trading volume in Czech market based on a newly developed algorithm, called Multifractal Cross-Correlation Analysis (MFCCA). The new algorithm is a natural multifractal generalization of the Detrended Cross-Correlation Analysis (DCCA), and is sensitive to cross-correlation structure and free from limitations of other algorithms. By considering the original sign of the cross-covariance, it allows us to properly quantify and detect the subtle characteristics of two simultaneous recorded time series. First, the multifractality and the long range anti-persistent auto-correlations of price return and trading volume variation are confirmed using Multifractal Detrended Fluctuation Analysis (MF-DFA). Furthermore, we show that there exist long-range anti-persistent cross-correlations between price return and trading volume variation by MFCCA. And we also identify that the cross-correlations disappear on the level of relative small fluctuations. In order to obtain deeper insight into the dynamics of the electricity market, we analyze the relation between generalized Hurst exponent and the multifractal cross-correlation scaling exponent λq. We find that the difference between the generalized Hurst exponent and the multifractal cross-correlation scaling exponent is significantly different for smaller fluctuation, which indicates that the multifractal character of cross-correlations resembles more each other for electricity price and trading volume on the level of large fluctuations and weakens for the smaller ones.

  9. Multifractal detrended moving average analysis of global temperature records

    CERN Document Server

    Mali, Provash

    2015-01-01

    Long-range correlation and multifractal nature of the global monthly mean temperature anomaly time series over the period 1850-2012 are studied in terms of the multifractal detrended moving average (MFDMA) method. We try to address the source(s) of multifractality in the time series by comparing the results derived from the actual series with those from a set of shuffled and surrogate series. It is seen that the newly developed MFDMA method predicts a multifractal structure of the temperature anomaly time series that is more or less similar to that observed by other multifractal methods. In our analysis the major contribution of multifractality in the temperature records is found to be stemmed from long-range temporal correlation among the measurements, however the contribution of fat-tail distribution function of the records is not negligible. The results of the MFDMA analysis, which are found to depend upon the location of the detrending window, tend towards the observations of the multifractal detrended fl...

  10. Screening for Diabetes Among Roma People Living in Serbia

    Science.gov (United States)

    Beljić Živković, Teodora; Marjanović, Milica; Prgomelja, Stela; Soldatović, Ivan; Koprivica, Branka; Acković, Dragoljub; Živković, Rodoljub

    2010-01-01

    Aim To investigate the prevalence of diabetes in the Roma population in Serbia. Methods We screened 11 urban and 8 rural Roma communities from October 2006 to May 2008 for the presence of diabetes. Blood glucose values, name, age, sex, presence of diabetes, family history, and obesity were recorded. Results We analyzed the data from 1465 Roma people, 953 women and 512 men (785 in urban and 680 in rural communities), with mean age of 42.42 ± 15.69 years. Abdominal obesity was present in 600 (41%) participants. Eighty seven participants (5.9%) already had diabetes and there were 76 (5.2%) newly discovered cases of diabetes type 2. Participants with diabetes were significantly older (F = 28.33; P Roma people living in Serbia may possibly be higher than in the general population of Serbia and needs further investigation. PMID:20401957

  11. Interleaving distribution of multifractal strength of 16-channel EEG signals

    Institute of Scientific and Technical Information of China (English)

    WANG Wei; NING Xinbao; WANG Jun; ZHANG Sheng; CHEN Jie; LI Lejia

    2003-01-01

    Multifractal characteristics of 16-channel human electroencephalogram (EEG) signals under eye-closed rest are analyzed for the first time. The result shows that the EEGs from the different sites on the scalp have different multifractal characteristics and the multifractal strength value Δα exhibits a kind of interleaving and left-right opposite distribution on scalp. This distribution rule is consistent with the localization of function and the lateralization theory in physiology. SoΔα can become an effective parameter to describe the brain potential character. And such a Δα stable distribution rule on sites of the scalp means a classic cerebral cortex active state.

  12. Multifractal Analysis of Infinite Products of Stationary Jump Processes

    Directory of Open Access Journals (Sweden)

    Petteri Mannersalo

    2010-01-01

    Full Text Available There has been a growing interest in constructing stationary measures with known multifractal properties. In an earlier paper, the authors introduced the multifractal products of stochastic processes (MPSP and provided basic properties concerning convergence, nondegeneracy, and scaling of moments. This paper considers a subclass of MPSP which is determined by jump processes with i.i.d. exponentially distributed interjump times. Particularly, the information dimension and a multifractal spectrum of the MPSP are computed. As a side result it is shown that the random partitions imprinted naturally by a family of Poisson point processes are sufficient to determine the spectrum in this case.

  13. Image edge detection based on multi-fractal spectrum analysis

    Institute of Scientific and Technical Information of China (English)

    WANG Shao-yuan; WANG Yao-nan

    2006-01-01

    In this paper,an image edge detection method based on multi-fractal spectrum analysis is presented.The coarse grain H(o)lder exponent of the image pixels is first computed,then,its multi-fractal spectrum is estimated by the kernel estimation method.Finally,the image edge detection is done by means of different multi-fractal spectrum values.Simulation results show that this method is efficient and has better locality compared with the traditional edge detection methods such as the Sobel method.

  14. Multifractal Model of Asset Returns versus real stock market dynamics

    CERN Document Server

    Oswiecimka, P; Drozdz, S; Górski, A Z; Rak, R

    2006-01-01

    There is more and more empirical evidence that multifractality constitutes another and perhaps the most significant financial stylized fact. A realistic model of the financial dynamics should therefore incorporate this effect. The most promising in this respect is the Multifractal Model of Asset Returns (MMAR) introduced by Mandelbrot in which multifractality is carried by time deformation. In our study we focus on the Lux extension to MMAR and empirical data from Warsaw Stock Exchange. We show that this model is able to reproduce relevant aspects of the real stock market dynamics.

  15. Empirical Study on the Multifractal Phenomenon of Chinese Stock Market

    Institute of Scientific and Technical Information of China (English)

    魏宇; 黄登仕

    2003-01-01

    Many recent researches with empirical data have demonstrated that financial data have multifractal properties. To study the properties of Chinese stock market, the Shanghai Stock Exchange Composite Index (SSECI) from January 1999 to July 2001 (a quotation taken every 5 min) is analyzed using multifractal theories, and it is found that the return volatility correlations are of power-laws with a non-unique scaling exponent. It is verified that Chinese stock market is quite similar to foreign financial markets in terms of multifractal properties.

  16. EQUALITY AND DISCIMINATION – ROMA SOCIAL EXCLUSION

    Directory of Open Access Journals (Sweden)

    Mircea George GHERASIM

    2015-06-01

    Full Text Available Substantiating the idea of equality of all citizens, Ion Ghica shows the special value of this concept and its importance for the Romanian society, saying that "equality is a noble and good aspiration of the generous man, of the man endowed with a sense of justice and fairness; it is the urge and hope of the intelligent person, of the scholar and of the worker, of the one who wants to climb the social ladder, who aspires to the development of progress and civilization". The purpose of this study is to focus on the issues of the Roma minority and on the ethnic discrimination in this segment, which is not limited to Romania, becoming rapidly a center of interest and concern throughout Europe.

  17. Origins and divergence of the Roma (gypsies).

    Science.gov (United States)

    Gresham, D; Morar, B; Underhill, P A; Passarino, G; Lin, A A; Wise, C; Angelicheva, D; Calafell, F; Oefner, P J; Shen, P; Tournev, I; de Pablo, R; Kuĉinskas, V; Perez-Lezaun, A; Marushiakova, E; Popov, V; Kalaydjieva, L

    2001-12-01

    The identification of a growing number of novel Mendelian disorders and private mutations in the Roma (Gypsies) points to their unique genetic heritage. Linguistic evidence suggests that they are of diverse Indian origins. Their social structure within Europe resembles that of the jatis of India, where the endogamous group, often defined by profession, is the primary unit. Genetic studies have reported dramatic differences in the frequencies of mutations and neutral polymorphisms in different Romani populations. However, these studies have not resolved ambiguities regarding the origins and relatedness of Romani populations. In this study, we examine the genetic structure of 14 well-defined Romani populations. Y-chromosome and mtDNA markers of different mutability were analyzed in a total of 275 individuals. Asian Y-chromosome haplogroup VI-68, defined by a mutation at the M82 locus, was present in all 14 populations and accounted for 44.8% of Romani Y chromosomes. Asian mtDNA-haplogroup M was also identified in all Romani populations and accounted for 26.5% of female lineages in the sample. Limited diversity within these two haplogroups, measured by the variation at eight short-tandem-repeat loci for the Y chromosome, and sequencing of the HVS1 for the mtDNA are consistent with a small group of founders splitting from a single ethnic population in the Indian subcontinent. Principal-components analysis and analysis of molecular variance indicate that genetic structure in extant endogamous Romani populations has been shaped by genetic drift and differential admixture and correlates with the migrational history of the Roma in Europe. By contrast, social organization and professional group divisions appear to be the product of a more recent restitution of the caste system of India.

  18. Multifractal Simulation of Geochemical Map Patterns

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Using a simple multifractal model based on the model De Wijs, various geochemical map patterns for element concentration values are being simulated. Each pattern is self-similar on the average in that a similar pattern can be derived by application of the multiplicative cascade model used to any small subarea on the pattern. In other experiments, the original, self-similar pattern is distorted by superimposing a 2-dimensional trend pattern and by mixing it with a constant concentration value model. It is investigated how such distortions change the multifractal spectrum estimated by means of the 3-step method of moments. Discrete and continuous frequency distribution models are derived for patterns that satisfy the model of De Wijs. These simulated patterns satisfy a discrete frequency distribution model that as upper bound has a continuous frequency distribution to which it approaches in form when the subdivisions of the multiplicative cascade model are repeated indefinitely. This limiting distribution is lognormal in the center and has Pareto tails. Potentially, this approach has important implications in mineral and oil resource evaluation.

  19. Identification of Geochemical Anomaly by Multifractal Analysis

    Institute of Scientific and Technical Information of China (English)

    Xie Shuyun; Cheng Qiuming; Ke Xianzhong; Bao Zhengyu; Wang Changming; Quan Haoli

    2008-01-01

    The separation of anomalies from geochemical background is an important part of data analysis because lack of such identifications might have profound influence on or even distort the final analysis results. In this article, 1 672 geochemical analytical data of 11 elements, including Cu, Mo, Ag, Sn, and others, from a region within Tibet, South China, are used as one example. Together with the traditional anomaly recognition method of using the iterative mean ±2σ, local multifractality theory has been utilized to delineate the ranges of geochemical anomalies of the elements. To different degrees, on the basis of original data mapping, C-A fractal analysis and singularity exponents, Sn differs from the other 10 elements. Moreover, geochemical mapping results based on values of the multifractal asymmetry index for all elements delineate the highly anomalous area. Similar to other 10 elements, the anomalous areas of Sn delineated by the asymmetry index distribute along the main structure orientations. According to the asymmetry indexes, the 11 elements could be classified into 3 groups: (1) Ag and Au, (2) As-Sb-Cu-Pb-Zn-Mo, and (3) Sn-Bi-W.This paragenetic association of elements can be used to interpret possible origins of mineralization, which is in agreement with petrological analysis and field survey results.

  20. Multifractals, random walks and Arctic sea ice

    Science.gov (United States)

    Agarwal, Sahil; Wettlaufer, John

    We examine the long-term correlations and multifractal properties of daily satellite retrievals of Arctic sea ice albedo, extent, and ice velocity for decadal periods. The approach harnesses a recent development called Multifractal Temporally Weighted Detrended Fluctuation Analysis (MF-TWDFA), which exploits the intuition that points closer in time are more likely to be related than distant points. In both data sets we extract multiple crossover times, as characterized by generalized Hurst exponents, ranging from synoptic to decadal. The method goes beyond treatments that assume a single decay scale process, such as a first-order autoregression, which cannot be justifiably fit to these observations. The ice extent data exhibits white noise behavior from seasonal to bi-seasonal time scales, whereas the clear fingerprints of the short (weather) and long (~ 7 and 9 year) time scales remain, the latter associated with the recent decay in the ice cover. Thus, long term persistence is reentrant beyond the seasonal scale and it is not possible to distinguish whether a given ice extent minimum/maximum will be followed by a minimum/maximum that is larger or smaller in magnitude. The ice velocity data show long term persistence in auto covariance. NASA Grant NNH13ZDA001N-CRYO and Swedish Research Council Grant No. 638-2013-9243.

  1. Differences between Roma and non-Roma in how social support from family and friends helps to overcome health care accessibility problems.

    Science.gov (United States)

    Bobakova, Daniela; Dankulincova Veselska, Zuzana; Babinska, Ingrid; Klein, Daniel; Madarasova Geckova, Andrea; Cislakova, Lydia

    2015-04-14

    Roma are the most deprived ethnic minority in Slovakia, suffering from discrimination, poverty and social exclusion. Problematic access to good quality health care as result of institutional and interpersonal discrimination affects their health; therefore, factors which affect health care accessibility of Roma are of high importance for public health and policy makers. The aim of this study was to explore the association between health care accessibility problems and ethnicity and how different levels of social support from family and friends affect this association. We used data from the cross-sectional HepaMeta study conducted in 2011 in Slovakia. The final sample comprised 452 Roma (mean age = 34.7; 35.2% men) and 403 (mean age = 33.5; 45.9% men) non-Roma respondents. Roma in comparison with non-Roma have a more than 3-times higher chance of reporting health care accessibility problems. Social support from family and friends significantly decreases the likelihood of reporting health care accessibility problems in both Roma and non-Roma, while the family seems to be the more important factor. The worse access to health care of Roma living in so-called settlements seems to be partially mediated by social support. Interventions should focus on Roma health mediators and community workers who can identify influential individuals who are able to change a community's fear and distrust and persuade and teach Roma to seek and appropriately use health care services.

  2. Common multifractality in the heart rate variability and brain activity of healthy humans

    Science.gov (United States)

    Lin, D. C.; Sharif, A.

    2010-06-01

    The influence from the central nervous system on the human multifractal heart rate variability (HRV) is examined under the autonomic nervous system perturbation induced by the head-up-tilt body maneuver. We conducted the multifractal factorization analysis to factor out the common multifractal factor in the joint fluctuation of the beat-to-beat heart rate and electroencephalography data. Evidence of a central link in the multifractal HRV was found, where the transition towards increased (decreased) HRV multifractal complexity is associated with a stronger (weaker) multifractal correlation between the central and autonomic nervous systems.

  3. Daily extreme temperature multifractals in Catalonia (NE Spain)

    Energy Technology Data Exchange (ETDEWEB)

    Burgueño, A. [Departament d' Astronomia i Meteorologia, Universitat de Barcelona, Barcelona (Spain); Lana, X., E-mail: francisco.javier.lana@upc.edu [Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya, Barcelona (Spain); Serra, C. [Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya, Barcelona (Spain); Martínez, M.D. [Departament de Física Aplicada, Universitat Politècnica de Catalunya, Barcelona (Spain)

    2014-02-01

    The multifractal character of the daily extreme temperatures in Catalonia (NE Spain) is analyzed by means of the multifractal detrended fluctuation analysis (MF-DFA) applied to 65 thermometric records covering years 1950–2004. Although no clear spatial patterns of the multifractal spectrum parameters appear, factor scores deduced from Principal Component analysis indicate some signs of spatial gradients. Additionally, the daily extreme temperature series are classified depending on their complex time behavior, through four multifractal parameters (Hurst exponent, Hölder exponent with maximum spectrum, spectrum asymmetry and spectrum width). As a synthesis of the three last parameters, a basic measure of complexity is proposed through a normalized Complexity Index. Its regional behavior is found to be free of geographical dependences. This index represents a new step towards the description of the daily extreme temperatures complexity.

  4. Multiscale multifractal time irreversibility analysis of stock markets

    Science.gov (United States)

    Jiang, Chenguang; Shang, Pengjian; Shi, Wenbin

    2016-11-01

    Time irreversibility is one of the most important properties of nonstationary time series. Complex time series often demonstrate even multiscale time irreversibility, such that not only the original but also coarse-grained time series are asymmetric over a wide range of scales. We study the multiscale time irreversibility of time series. In this paper, we develop a method called multiscale multifractal time irreversibility analysis (MMRA), which allows us to extend the description of time irreversibility to include the dependence on the segment size and statistical moments. We test the effectiveness of MMRA in detecting multifractality and time irreversibility of time series generated from delayed Henon map and binomial multifractal model. Then we employ our method to the time irreversibility analysis of stock markets in different regions. We find that the emerging market has higher multifractality degree and time irreversibility compared with developed markets. In this sense, the MMRA method may provide new angles in assessing the evolution stage of stock markets.

  5. Multifractal properties of Chinese stock market in Shanghai

    Science.gov (United States)

    Du, Guoxiong; Ning, Xuanxi

    2008-01-01

    In this article, we apply three methods of multifractal analysis, partition function method, singular spectrum method and multifractal detrended fluctuation analysis method, to analyze the closing index fluctuations of Shanghai stock market during the past seven years. We have found that Shanghai stock market has weak multifractal features and there are long-range power-law correlations between index series. The shapes of singular spectrums do not change with time scales and their strengths weaken when the scales shorten. But when the orders of partition function increase, the strengths of multifractal increase, the singular spectrums become rougher and the general Hurst exponents decrease. These results provide solid and important values for further study on the dynamic mechanism of stock market price fluctuation.

  6. Introduction to multifractal detrended fluctuation analysis in matlab.

    Science.gov (United States)

    Ihlen, Espen A F

    2012-01-01

    Fractal structures are found in biomedical time series from a wide range of physiological phenomena. The multifractal spectrum identifies the deviations in fractal structure within time periods with large and small fluctuations. The present tutorial is an introduction to multifractal detrended fluctuation analysis (MFDFA) that estimates the multifractal spectrum of biomedical time series. The tutorial presents MFDFA step-by-step in an interactive Matlab session. All Matlab tools needed are available in Introduction to MFDFA folder at the website www.ntnu.edu/inm/geri/software. MFDFA are introduced in Matlab code boxes where the reader can employ pieces of, or the entire MFDFA to example time series. After introducing MFDFA, the tutorial discusses the best practice of MFDFA in biomedical signal processing. The main aim of the tutorial is to give the reader a simple self-sustained guide to the implementation of MFDFA and interpretation of the resulting multifractal spectra.

  7. A new measure to characterize multifractality of sleep electroencephalogram

    Institute of Scientific and Technical Information of China (English)

    MA Qianli; NING Xinbao; WANG Jun; BIAN Chunhua

    2006-01-01

    Traditional methods for nonlinear dynamic analysis, such as correlation dimension,Lyapunov exponent, approximate entropy, detrended fluctuation analysis, using a single parameter, cannot fully describe the extremely sophisticated behavior of electroencephalogram (EEG). The multifractal formalism reveals more "hidden" information of EEG by using singularity spectrum to characterize its nonlinear dynamics. In this paper, the zero-crossing time intervals of sleep EEG were studied using multifractal analysis. A new multifractal measure △asα was proposed to describe the asymmetry of singularity spectrum, and compared with the singularity strength range △α that was normally used as a degree indicator of multifractality. One-way analysis of variance and multiple comparison tests showed that the new measure we proposed gave better discrimination of sleep stages, especially in the discrimination between sleep and awake, and between sleep stages 3and 4.

  8. SOCIAL ECONOMY A SOLUTION FOR THE DEVELOPMENT OF ROMA COMMUNITIES IN ROMANIA

    Directory of Open Access Journals (Sweden)

    Mihaela Ghinescu

    2012-02-01

    Full Text Available The project „Social Economy a solution for the development of Roma Communities in Romania” contributes to the efforts of Romanian stakeholders to develop and implement of the National Strategy for the Inclusion of Roma Citizens belonging to Roma Minority. Signed by the Management Authority in March 2011, the project provides support for the development of socio-economic interventions within Romacommunities and promotes social economy as a social inclusion tool for a group as vulnerable to the insertion on the labor market as that of the Roma. The project helps advance key issues regarding social economy and Roma communities, inter-alia sustainability and how to create a network of professionals that will further developthe concept among Roma groups, social inclusion and equal opportunities as relates especially to Roma women, but also to Roma young people, local and national ownership.

  9. Social distance and stereotypes of Roma at the primary school age

    Directory of Open Access Journals (Sweden)

    Franceško Mirjana

    2006-01-01

    Full Text Available The sample of the research presented in this paper consisted of 575 children age 10 and 11 from four of Novi Sad`s primary school. 58 of them were Roma and the rest were Serbs, Hungarians, Croats, etc. The paper deals with the social distance toward the six ethnic groups (Roma, Serbs, Croats Hungarians, Slovaks and Ruthenians, as well as stereotypes of Roma both in Roma and non-Roma children. Sample has also been divided in two by the criteria of Roma children attending the same classes as the children in the sample or not. The results show that social distance toward the Roma is higher than any other social distance in this sample. Also, we were not able to find any significant differences in this social distance between children who attend the school with the Roma children and those who do not. As could be expected, the auto stereotypes were more positive than the hetero stereotypes.

  10. Addressing barriers to healthcare access for Roma: A community development approach

    Directory of Open Access Journals (Sweden)

    Kirwan Gloria

    2016-08-01

    Full Text Available The Roma community in Europe has experienced persistent marginalisation and disadvantage over many generations, with Roma regularly experiencing problems of access to healthcare, accommodation, education and employment within the European context. Ireland is a relatively new destination for Roma migration and, as yet, the experiences of Roma in Ireland are under-researched. However, problematic access to healthcare has emerged as an issue faced by the Roma community in Ireland. With reference to the work of the Tallaght Roma Integration Project (TRIP, this article aims to illuminate some of the challenges faced by Roma in this regard. The work of TRIP is informed by community development principles, including concepts of participation and social solidarity. This article explores how community development can offer a framework through which the Roma community can engage collaboratively with service providers in order to highlight need and mobilise change in service provision.

  11. Performance of multifractal detrended fluctuation analysis on short time series

    CERN Document Server

    Lopez, Juan Luis

    2013-01-01

    The performance of the multifractal detrended analysis on short time series is evaluated for synthetic samples of several mono- and multifractal models. The reconstruction of the generalized Hurst exponents is used to determine the range of applicability of the method and the precision of its results as a function of the decreasing length of the series. As an application the series of the daily exchange rate between the U.S. dollar and the euro is studied.

  12. Asymmetric joint multifractal analysis in Chinese stock markets

    Science.gov (United States)

    Chen, Yuwen; Zheng, Tingting

    2017-04-01

    In this paper, the asymmetric joint multifractal analysis method based on statistical physics is proposed to explore the asymmetric correlation between daily returns and trading volumes in Chinese stock markets. The result shows asymmetric multifractal correlations exist between return and trading volume in Chinese stock markets. Moreover, when the stock indexes are upward, the fluctuations of returns are always weaker than when they are downward, whether the trading volumes are more or less.

  13. Dynamically multilayered visual system of the multifractal fly.

    Science.gov (United States)

    Baptista, M S; Grebogi, Celso; Köberle, Roland

    2006-10-27

    We dynamically analyze our experimental results on the motion sensitive spiking H1 neuron of the fly's visual system. We find that the fly uses an alphabet composed of a few letters to encode the information contained in the stimulus. The alphabet dynamics is multifractal both with and without stimulus, though the multifractality increases with the stimulus entropy. This is in sharp contrast to models generating independent spike intervals, whose dynamics is monofractal.

  14. INDIVIDUAL COMMUNICATION TRANSMITTER IDENTIFICATION BASED ON MULTIFRACTAL ANALYSIS

    Institute of Scientific and Technical Information of China (English)

    Ren Chunhui; Wei Ping; Lou Zhiyou; Xiao Xianci

    2005-01-01

    In this letter, the communication transmitter transient signals are analyzed based on the time-variant hierarchy exponents of multifractal analysis. The species of optimized sample set is selected as the template of transmitter identification, so that the individual communication transmitter identification can be realized. The turn-on signals of four transmitters are used in the simulation. The experimental results show that the multifractal character of transmitter transient signals is an effective character of individual transmitter identification.

  15. Detrended cross-correlation analysis consistently extended to multifractality.

    Science.gov (United States)

    Oświecimka, Paweł; Drożdż, Stanisław; Forczek, Marcin; Jadach, Stanisław; Kwapień, Jarosław

    2014-02-01

    We propose an algorithm, multifractal cross-correlation analysis (MFCCA), which constitutes a consistent extension of the detrended cross-correlation analysis and is able to properly identify and quantify subtle characteristics of multifractal cross-correlations between two time series. Our motivation for introducing this algorithm is that the already existing methods, like multifractal extension, have at best serious limitations for most of the signals describing complex natural processes and often indicate multifractal cross-correlations when there are none. The principal component of the present extension is proper incorporation of the sign of fluctuations to their generalized moments. Furthermore, we present a broad analysis of the model fractal stochastic processes as well as of the real-world signals and show that MFCCA is a robust and selective tool at the same time and therefore allows for a reliable quantification of the cross-correlative structure of analyzed processes. In particular, it allows one to identify the boundaries of the multifractal scaling and to analyze a relation between the generalized Hurst exponent and the multifractal scaling parameter λ(q). This relation provides information about the character of potential multifractality in cross-correlations and thus enables a deeper insight into dynamics of the analyzed processes than allowed by any other related method available so far. By using examples of time series from the stock market, we show that financial fluctuations typically cross-correlate multifractally only for relatively large fluctuations, whereas small fluctuations remain mutually independent even at maximum of such cross-correlations. Finally, we indicate possible utility of MFCCA to study effects of the time-lagged cross-correlations.

  16. Estimation of the global regularity of a multifractional Brownian motion

    DEFF Research Database (Denmark)

    Lebovits, Joachim; Podolskij, Mark

    This paper presents a new estimator of the global regularity index of a multifractional Brownian motion. Our estimation method is based upon a ratio statistic, which compares the realized global quadratic variation of a multifractional Brownian motion at two different frequencies. We show...... that a logarithmic transformation of this statistic converges in probability to the minimum of the Hurst functional parameter, which is, under weak assumptions, identical to the global regularity index of the path....

  17. Direct Evidence for Inversion Formula in Multifractal Financial Volatility Measure

    Institute of Scientific and Technical Information of China (English)

    JIANG Zhi-Qiang; ZHOU Wei-Xing

    2009-01-01

    The inversion formula for conservative multifractal measures was unveiled mathematically a decade ago, which is however not well tested in real complex systems. We propose to verify the inversion formula using high-frequency 1982 to 1999 and its inverse measure of exit time. Both the direct and inverse measures exhibit nice multifractal nature, whose scaling ranges are not irrelevant. Empirical investigation shows that the inversion formula holds in financial markets.

  18. When Van Gogh meets Mandelbrot: Multifractal Classification of Painting's Texture

    OpenAIRE

    Abry, Patrice; Wendt, Herwig; Jaffard, Stéphane

    2013-01-01

    International audience; In a recent past, there has been a growing interest for examining the po- tential of Image Processing tools to assist Art Investigation. Simultaneously, several research works showed the interest of using multifractal analysis for the description of homogeneous textures in images. In this context, the goal of the present contribution is to study the benefits of using the wavelet leader based multifractal formalism to characterize paintings. To that end, after a brief r...

  19. A comparative study of two-dimensional multifractal detrended fluctuation analysis and two-dimensional multifractal detrended moving average algorithm to estimate the multifractal spectrum

    Science.gov (United States)

    Xi, Caiping; Zhang, Shunning; Xiong, Gang; Zhao, Huichang

    2016-07-01

    Multifractal detrended fluctuation analysis (MFDFA) and multifractal detrended moving average (MFDMA) algorithm have been established as two important methods to estimate the multifractal spectrum of the one-dimensional random fractal signal. They have been generalized to deal with two-dimensional and higher-dimensional fractal signals. This paper gives a brief introduction of the two-dimensional multifractal detrended fluctuation analysis (2D-MFDFA) and two-dimensional multifractal detrended moving average (2D-MFDMA) algorithm, and a detailed description of the application of the two-dimensional fractal signal processing by using the two methods. By applying the 2D-MFDFA and 2D-MFDMA to the series generated from the two-dimensional multiplicative cascading process, we systematically do the comparative analysis to get the advantages, disadvantages and the applicabilities of the two algorithms for the first time from six aspects such as the similarities and differences of the algorithm models, the statistical accuracy, the sensitivities of the sample size, the selection of scaling range, the choice of the q-orders and the calculation amount. The results provide a valuable reference on how to choose the algorithm from 2D-MFDFA and 2D-MFDMA, and how to make the schemes of the parameter settings of the two algorithms when dealing with specific signals in practical applications.

  20. Roma ethnicity and clinical outcomes in kidney transplant recipients.

    Science.gov (United States)

    Molnar, Miklos Z; Langer, Robert M; Remport, Adam; Czira, Maria E; Rajczy, Katalin; Kalantar-Zadeh, Kamyar; Kovesdy, Csaba P; Novak, Marta; Mucsi, Istvan; Rosivall, Laszlo

    2012-06-01

    Racial and ethnic disparities among North American patients with chronic kidney disease have received significant attention. In contrast, little is known about health-related outcomes of patients with end-stage renal disease among the Roma minority, also known as gypsies, compared to Caucasian individuals. We prospectively assessed the association between Roma ethnicity and long-term clinical outcomes in kidney transplant recipients. In a prevalent cohort of renal transplant recipients, followed up over a median of 94 months, we prospectively collected socio-demographic, medical (and transplant related) characteristics and laboratory data at baseline from 60 Roma and 1,003 Caucasian patients (mean age 45 (SD = 11) and 49 (SD = 13) years, 33 and 41% women, 18 and 17% with diabetes mellitus, respectively). Survival analyses examined the associations between Roma ethnicity and all-cause mortality and death-censored graft loss or death with functioning renal allograft. During the follow-up period, 341 patients (32%) died. Two-hundred eighty (26%) patients died with a functioning graft and 201 patients (19%) returned to dialysis. After multivariable adjustments, Roma ethnicity was associated with 77% higher risk of all-cause mortality (Hazard Ratio (HR): 1.77; 95% confidence interval (CI): 1.02, 3.07), two times higher risk of mortality with functioning graft (2.04 [1.17-3.55]) and 77% higher risk of graft loss (1.77 [1.01-3.13]), respectively. Roma ethnicity is independently associated with increased mortality risk and worse graft outcome in kidney transplant recipients. Further studies should identify the factors contributing to worse outcomes among Roma patients.

  1. Dying and death in some Roma communities: ethical challenges.

    Science.gov (United States)

    Roman, Gabriel; Gramma, Rodica; Enache, Angela; Pârvu, Andrada; Ioan, Beatrice; Moisa, Ştefana Maria; Dumitraş, Silvia; Chirita, Radu

    2014-04-01

    The Roma people have specific values, therefore their views and beliefs about illness, dying and death are important to be known for health care providers caring for members of this community. The aim of this qualitative study based on 48 semi-structured interviews with Roma patients and caregivers in communities in two regions of Romania was to examine their selfdescribed behaviors and practices, their experiences and perceptions of illness, dying and death. Five more important themes about the Roma people facing dying and death have been identified: (1) The perception of illness in the community as reason for shame and the isolation that results from this, as well as the tendency for Roma people to take this on in their self image; (2) The importance of the family as the major support for the ill/dying individual, including the social requirement that family gather when someone is ill/dying; (3) The belief that the patient should not be told his/her diagnosis for fear it will harm him/her and that the family should be informed of the diagnosis as the main decision maker regarding medical treatment; (4) The reluctance of the Roma to decide on stopping life prolonging treatment; (5) The view of death as 'impure'. These results can be useful for health care providers working with members of the Roma community. By paying attention to and respecting the Roma patients' values, spirituality, and relationship dynamics, the medical staff can provide the most suitable healthcare by respecting the patients' wishes and expectations.

  2. Multifractal analysis of high resolution solar wind proton density measurements

    Science.gov (United States)

    Sorriso-Valvo, Luca; Carbone, Francesco; Leonardis, Ersilia; Chen, Christopher H. K.; Šafránková, Jana; Němeček, Zdenek

    2017-03-01

    The solar wind is a highly turbulent medium, with a high level of field fluctuations throughout a broad range of scales. These include an inertial range where a turbulent cascade is assumed to be active. The solar wind cascade shows intermittency, which however may depend on the wind conditions. Recent observations have shown that ion-scale magnetic turbulence is almost self-similar, rather than intermittent. A similar result was observed for the high resolution measurements of proton density provided by the spacecraft Spektr-R. Intermittency may be interpreted as the result of the multifractal properties of the turbulent cascade. In this perspective, this paper is devoted to the description of the multifractal properties of the high resolution density measurements. In particular, we have used the standard coarse-graining technique to evaluate the generalized dimensions Dq , and from these the multifractal spectrum f (α) , in two ranges of scale. A fit with the p-model for intermittency provided a quantitative measure of multifractality. Such indicator was then compared with alternative measures: the width of the multifractal spectrum, the peak of the kurtosis, and its scaling exponent. The results indicate that the small-scale fluctuations are multifractal, and suggest that different measures of intermittency are required to fully understand the small scale cascade.

  3. Affirmative Action in Romania's Higher Education: Roma Students' Perceived Meanings and Dilemmas

    Science.gov (United States)

    Pantea, Maria-Carmen

    2015-01-01

    This qualitative paper explores Roma students' perceptions on the policy of assigning "special places" for Roma in Romania's universities. Findings suggest that Roma see themselves as occupying a precarious social space, concerned not as much to hide perceived merit violation but to handle (alleged) inadequacies given by their…

  4. Involvement of Roma Parents in Children's Education in Croatia: A Comparative Study

    Science.gov (United States)

    Pahic, Tea; Vidovic, Vlasta Vizek; Miljevic-Ridicki, Renata

    2011-01-01

    This article compares Roma and mainstream parents' involvement in the education of their children, based on Epstein's six-dimensional model of parent-school partnership. The survey was conducted in Croatia on two sub-samples: 60 Roma parents and 908 mainstream parents. Results suggest that Roma parents show lower interest in participating in…

  5. Effects of a Dialogue-Based Program to Improve Emotion Knowledge in Spanish Roma Preschoolers

    Science.gov (United States)

    Giménez-Dasí, Marta; Quintanilla, Laura; Ojeda, Vanesa; Lucas-Molina, Beatriz

    2017-01-01

    Romas are one of the largest minority groups in Spain and Europe, but no specific data on children's socioemotional learning are available. Our goal was to determine the level of socioemotional knowledge of a group of 4- and 5-year-old Roma children and to implement an intervention program at school. Forty-three Roma children participated…

  6. Effects of a Dialogue-Based Program to Improve Emotion Knowledge in Spanish Roma Preschoolers

    Science.gov (United States)

    Giménez-Dasí, Marta; Quintanilla, Laura; Ojeda, Vanesa; Lucas-Molina, Beatriz

    2017-01-01

    Romas are one of the largest minority groups in Spain and Europe, but no specific data on children's socioemotional learning are available. Our goal was to determine the level of socioemotional knowledge of a group of 4- and 5-year-old Roma children and to implement an intervention program at school. Forty-three Roma children participated…

  7. Rethinking the Role of Pedagogical Assistants: Establishing Cooperation between Roma Families and Schools in Serbia

    Science.gov (United States)

    Starcevic, Jelena; Dimitrijevic, Bojana; Macura-Milovanovic, Suncica

    2016-01-01

    The aim of the present paper is to examine the risks and challenges related to the cooperation of pedagogical assistants (PAs) with Roma parents/families and their work with Roma pupils, as well as to offer further insight into ways to overcome these risks and challenges. Roma pupils and parents/families face numerous difficulties in education,…

  8. Pre-Primary Education of Roma Children in Serbia: Barriers and Possibilities

    Science.gov (United States)

    Macura-Milovanovic, Suncica

    2013-01-01

    In Serbia, as in the other countries of the Western Balkans and South-Eastern Europe, the most disadvantaged communities belong to the Roma minority. The present paper demonstrates the conditions of Roma preschool children in Serbia: primarily their early education, but also habitation and health in Roma settlements. The data highlight the…

  9. Affirmative Action in Romania's Higher Education: Roma Students' Perceived Meanings and Dilemmas

    Science.gov (United States)

    Pantea, Maria-Carmen

    2015-01-01

    This qualitative paper explores Roma students' perceptions on the policy of assigning "special places" for Roma in Romania's universities. Findings suggest that Roma see themselves as occupying a precarious social space, concerned not as much to hide perceived merit violation but to handle (alleged) inadequacies given by their…

  10. Involvement of Roma Parents in Children's Education in Croatia: A Comparative Study

    Science.gov (United States)

    Pahic, Tea; Vidovic, Vlasta Vizek; Miljevic-Ridicki, Renata

    2011-01-01

    This article compares Roma and mainstream parents' involvement in the education of their children, based on Epstein's six-dimensional model of parent-school partnership. The survey was conducted in Croatia on two sub-samples: 60 Roma parents and 908 mainstream parents. Results suggest that Roma parents show lower interest in participating in…

  11. A rainfall simulator based on multifractal generator

    Science.gov (United States)

    Akrour, Nawal; mallet, Cecile; barthes, Laurent; chazottes, Aymeric

    2015-04-01

    The Precipitations are due to complex meteorological phenomenon's and unlike other geophysical constituents such as water vapour concentration they present a relaxation behaviour leading to an alternation of dry and wet periods. Thus, precipitations can be described as intermittent process. The spatial and temporal variability of this phenomenon is significant and covers large scales. This high variability can cause extreme events which are difficult to observe properly because of their suddenness and their localized character. For all these reasons, the precipitations are therefore difficult to model. This study aims to adapt a one-dimensional time series model previously developed by the authors [Akrour et al., 2013, 2014] to a two-dimensional rainfall generator. The original time series model can be divided into 3 major steps : rain support generation, intra event rain rates generation using multifractal and finally calibration process. We use the same kind of methodology in the present study. Based on dataset obtained from meteorological radar of Météo France with a spatial resolution of 1 km x 1 km we present the used approach : Firstly, the extraction of rain support (rain/no rain area) allowing the retrieval of the rain support structure function (variogram) and fractal properties. This leads us to use either the rain support modelisation proposed by ScleissXXX [ref] or directly real rain support extracted from radar rain maps. Then, the generation (over rain areas) of rain rates is made thanks to a 2D multifractal Fractionnally Integrated Flux (FIF) model [ref]. This second stage is followed by a calibration/forcing step (forcing average rain rate per events) added in order to provide rain rate coherent with observed rain-rate distribution. The forcing process is based on a relation identified from the average rain rate of observed events and their surfaces. The presentation will first explain the different steps presented above, then some results

  12. Exoplanetary Detection By Multifractal Spectral Analysis

    CERN Document Server

    Agarwal, Sahil; Wettlaufer, John S

    2016-01-01

    Owing to technological advances the number of exoplanets discovered has risen dramatically in the last few years. However, when trying to observe Earth analogs, it is often difficult to test the veracity of detection. We have developed a new approach to the analysis of exoplanetary spectral observations based on temporal multifractality, which identifies time scales that characterize planetary orbital motion around the host star. Without fitting spectral data to stellar models, we show how the planetary signal can be robustly detected from noisy data using noise amplitude as a source of information. For observation of transiting planets, combining this method with simple geometry allows us to relate the time scales obtained to primary transit and secondary exoplanet eclipse of the exoplanets. Making use of data obtained with ground-based and space-based observations we have tested our approach on HD 189733b. Moreover, we have investigated the use of this technique in measuring planetary orbital motion via dop...

  13. Multifractal properties of the random resistor network

    Science.gov (United States)

    Barthelemy; Buldyrev; Havlin; Stanley

    2000-04-01

    We study the multifractal spectrum of the current in the two-dimensional random resistor network at the percolation threshold. We consider two ways of applying the voltage difference: (i) two parallel bars, and (ii) two points. Our numerical results suggest that in the infinite system limit, the probability distribution behaves for small i as P(i) approximately 1/i, where i is the current. As a consequence, the moments of i of order q

  14. Using multifractals to evaluate oceanographic model skill

    Science.gov (United States)

    Skákala, Jozef; Cazenave, Pierre W.; Smyth, Timothy J.; Torres, Ricardo

    2016-08-01

    We are in an era of unprecedented data volumes generated from observations and model simulations. This is particularly true from satellite Earth Observations (EO) and global scale oceanographic models. This presents us with an opportunity to evaluate large-scale oceanographic model outputs using EO data. Previous work on model skill evaluation has led to a plethora of metrics. The paper defines two new model skill evaluation metrics. The metrics are based on the theory of universal multifractals and their purpose is to measure the structural similarity between the model predictions and the EO data. The two metrics have the following advantages over the standard techniques: (a) they are scale-free and (b) they carry important part of information about how model represents different oceanographic drivers. Those two metrics are then used in the paper to evaluate the performance of the FVCOM model in the shelf seas around the south-west coast of the UK.

  15. Multifractal Model of Soil Water Erosion

    Science.gov (United States)

    Oleshko, Klaudia

    2017-04-01

    Breaking of solid surface symmetry during the interaction between the rainfall of high erosivity index and internally unstable volcanic soil/vegetation systems, results in roughness increasing as well as fertile horizon loosing. In these areas, the sustainability of management practices depends on the ability to select and implement the precise indicators of soil erodibility and vegetation capacity to protect the system against the extreme damaging precipitation events. Notwithstanding, the complex, non-linear and scaling nature of the phenomena involved in the interaction among the soil, vegetation and precipitation is still not taken into account by the numerous commonly used empirical, mathematical and computer simulation models: for instance, by the universal soil loss equation (USLE). The soil erodibility factor (K-factor) is still measuring by a set of empirical, dimensionless parameters and indexes, without taking into account the scaling (frequently multifractal) origin of a broad range of heterogeneous, anisotropic and dynamical phenomena involved in hydric erosion. Their mapping is not representative of this complex system spatial variability. In our research, we propose to use the toolbox of fractals and multifractals techniques in vista of its ability to measure the scale invariance and type/degree of soil, vegetation and precipitation symmetry breaking. The hydraulic units are chosen as the precise measure of soil/vegetation stability. These units are measured and modeled for soils with contrasting architecture, based on their porosity/permeability (Poroperm) as well as retention capacity relations. The simple Catalog of the most common Poroperm relations is proposed and the main power law relations among the elements of studied system are established and compared for some representative agricultural and natural Biogeosystems of Mexico. All resulted are related with the Mandelbrot' Baby Theorem in order to construct the universal Phase Diagram which

  16. Stability and change of personality across the life course: the impact of age and major life events on mean-level and rank-order stability of the Big Five.

    Science.gov (United States)

    Specht, Jule; Egloff, Boris; Schmukle, Stefan C

    2011-10-01

    Does personality change across the entire life course, and are those changes due to intrinsic maturation or major life experiences? This longitudinal study investigated changes in the mean levels and rank order of the Big Five personality traits in a heterogeneous sample of 14,718 Germans across all of adulthood. Latent change and latent moderated regression models provided 4 main findings: First, age had a complex curvilinear influence on mean levels of personality. Second, the rank-order stability of Emotional Stability, Extraversion, Openness, and Agreeableness all followed an inverted U-shaped function, reaching a peak between the ages of 40 and 60 and decreasing afterward, whereas Conscientiousness showed a continuously increasing rank-order stability across adulthood. Third, personality predicted the occurrence of several objective major life events (selection effects) and changed in reaction to experiencing these events (socialization effects), suggesting that personality can change due to factors other than intrinsic maturation. Fourth, when events were clustered according to their valence, as is commonly done, effects of the environment on changes in personality were either overlooked or overgeneralized. In sum, our analyses show that personality changes throughout the life span, but with more pronounced changes in young and old ages, and that this change is partly attributable to social demands and experiences.

  17. European Policies for Social Inclusion of Roma: Catch 22?

    Directory of Open Access Journals (Sweden)

    Elena Marushiakova

    2015-09-01

    Full Text Available The article analyzes contemporary political discourses with regard to social inclusion of Roma on the basis of comparison with achievements and failures in the previous historical period of the communist rule in Eastern Europe. It argues that since the vast majority of the European Roma had lived in the past and continue living nowadays in the countries of Eastern Europe, no successful policy for their inclusion is possible without taking into account the experiences and outcomes of the actions for Roma integration in the socialist period. The experience from the times of socialism shows that successful policies are possible only in an appropriate socio-political context and only if accomplished within the mainstream approach. Against this background, the article scrutinizes the European Policies for Social Inclusion of Roma, and explains why they present a Catch 22 situation: There is a vicious cycle of problems which need to be solved; the solution requires a special policy for inclusion, however this policy stigmatizes Roma and sets them even more apart from the rest of society. Thus the vicious cycle of problems expands. The main point of the article is to propose an explanation of this failure of democracy and liberalism, which could constitute a useful lesson for the future.

  18. Shame and Anxiety Feelings of a Roma Population in Greece.

    Science.gov (United States)

    Gouva, M; Mentis, M; Kotrotsiou, S; Paralikas, Th; Kotrotsiou, E

    2015-12-01

    Shame is a crucial issue for Roma. The purpose of the present study was to evaluate the severity of shame and anxiety feelings in a Roma population living in Greece and assess the differentiation of these feelings between Roma men and women. A quota sample of 194 Roma adult men and women living in Southern Greece was retrieved. The Experiences of Shame Scale (ESS), the Other As Shamer Scale (OAS) and the Spielberg's State/Trait Anxiety Inventory (STAI) questionnaires were used. Women scored statistically significantly higher than men on ESS, whereas men scored higher on OAS scale (52.27 ± 16.91 vs 45.42 ± 9.98 and 35.93 ± 16.94 vs 30.87 ± 13.72 respectively). Women scored higher than men in both STAI subscales, however significant differences were observed only in State Anxiety scale (48.83 ± 9.26 vs 43.20 ± 9.81). OAS total score was inversely related to state anxiety, whereas ESS total score was positive related to trait anxiety, all correlations being significant at p Roma men and women exhibit high levels of shame and anxiety. Cultural, social and minority issues contribute to feelings of inferiority and anxiety experience.

  19. Single and Joint Multifractal Analysis of Soil Particle Size Distributions

    Institute of Scientific and Technical Information of China (English)

    LI Yi; LI Min; R.HORTON

    2011-01-01

    It is noted that there has been little research to compare volume-based and number-based soil particle size distributions (PSDs).Our objectives were to characterize the scaling properties and the possible connections between volume-based and number-based PSDs by applying single and joint multifractal analysis.Twelve soil samples were taken from selected sites in Northwest China and their PSDs were analyzed using laser diffractometry.The results indicated that the volume-based PSDs of all 12 samples and thc number-based PSDs of 4 samples had multifractal scalings for moment order -6 < q < 6.Some empirical relationships were identified between the extreme probability values, maximum probability (Pmax), minimum probability (Pmin), and Pmax/Pmin, and the multifractal indices,the difference and the ratio of generalized dimensions at q=0 and 1(D0-D1 and D1/D0), maximum and minimum singularity strength (αmax and αmin) and their difference (αmax - αmin, spectrum width), and asymmetric index (RD).An increase in Pmax generally resulted in corresponding increases of D0 - D1, αmax, αmax - αmin, and RD, which indicated that a large Pmax increased the multifractality of a distribution.Joint multifractal analysis showed that there was significant correlation between the scaling indices of volume-based and number-based PSDs.The multifractality indices indicated that for a given soil, the volume-based PSD was more homogeneous than the number-based PSD, and more likely to display monofractal rather than multifractal scaling.

  20. Measuring efficiency of international crude oil markets: A multifractality approach

    Science.gov (United States)

    Niere, H. M.

    2015-01-01

    The three major international crude oil markets are treated as complex systems and their multifractal properties are explored. The study covers daily prices of Brent crude, OPEC reference basket and West Texas Intermediate (WTI) crude from January 2, 2003 to January 2, 2014. A multifractal detrended fluctuation analysis (MFDFA) is employed to extract the generalized Hurst exponents in each of the time series. The generalized Hurst exponent is used to measure the degree of multifractality which in turn is used to quantify the efficiency of the three international crude oil markets. To identify whether the source of multifractality is long-range correlations or broad fat-tail distributions, shuffled data and surrogated data corresponding to each of the time series are generated. Shuffled data are obtained by randomizing the order of the price returns data. This will destroy any long-range correlation of the time series. Surrogated data is produced using the Fourier-Detrended Fluctuation Analysis (F-DFA). This is done by randomizing the phases of the price returns data in Fourier space. This will normalize the distribution of the time series. The study found that for the three crude oil markets, there is a strong dependence of the generalized Hurst exponents with respect to the order of fluctuations. This shows that the daily price time series of the markets under study have signs of multifractality. Using the degree of multifractality as a measure of efficiency, the results show that WTI is the most efficient while OPEC is the least efficient market. This implies that OPEC has the highest likelihood to be manipulated among the three markets. This reflects the fact that Brent and WTI is a very competitive market hence, it has a higher level of complexity compared against OPEC, which has a large monopoly power. Comparing with shuffled data and surrogated data, the findings suggest that for all the three crude oil markets, the multifractality is mainly due to long

  1. Are crude oil markets multifractal? Evidence from MF-DFA and MF-SSA perspectives

    Science.gov (United States)

    He, Ling-Yun; Chen, Shu-Peng

    2010-08-01

    In this article, we investigated the multifractality and its underlying formation mechanisms in international crude oil markets, namely, Brent and WTI, which are the most important oil pricing benchmarks globally. We attempt to find the answers to the following questions: (1) Are those different markets multifractal? (2) What are the dynamical causes for multifractality in those markets (if any)? To answer these questions, we applied both multifractal detrended fluctuation analysis (MF-DFA) and multifractal singular spectrum analysis (MF-SSA) based on the partition function, two widely used multifractality detecting methods. We found that both markets exhibit multifractal properties by means of these methods. Furthermore, in order to identify the underlying formation mechanisms of multifractal features, we destroyed the underlying nonlinear temporal correlation by shuffling the original time series; thus, we identified that the causes of the multifractality are influenced mainly by a nonlinear temporal correlation mechanism instead of a non-Gaussian distribution. At last, by tracking the evolution of left- and right-half multifractal spectra, we found that the dynamics of the large price fluctuations is significantly different from that of the small ones. Our main contribution is that we not only provided empirical evidence of the existence of multifractality in the markets, but also the sources of multifractality and plausible explanations to current literature; furthermore, we investigated the different dynamical price behaviors influenced by large and small price fluctuations.

  2. La vocación imperialista de la Roma republicana

    Directory of Open Access Journals (Sweden)

    María Dolores Ballesteros Sánchez-Tirado

    2003-11-01

    Full Text Available Un buen número de autores, seguidores de la estela historiográfica del siglo XIX, defienden la tesis de que Roma jamás tuvo intención de convertirse en un imperio y que éste le vino rodado. Argumentan que su política jamás tuvo tintes expansionistas, sino exclusivamente defensivos o, utilizando un término actual, preventivos y defienden que Roma se vio forzada a ser imperio en contra de su voluntad, e incluso de sus más íntimas convicciones. En este artículo se pone de manifiesto que, en realidad, Roma tuvo una vocación expansionista similar, y muchas veces superior, a todas los imperios que le precedieron y que su éxito se debió en gran parte a su fortísima vocación de poder.

  3. The Roma: People without a Home or Grave

    Directory of Open Access Journals (Sweden)

    Vera Klopčič

    2010-12-01

    Full Text Available Although the Roma have been living in Europe for centuries, they still face rejection by majority populations, being treated as undesirable strangers in almost all European countries. Written evidence of their arrival can be traced back to the fourteenth and fifteenth centuries. There are many legends and myths about their origins and reasons for emigrating from their country of origin. Until recently, the Roma transmitted their own history only as oral tradition. One of the best-known contemporary Roma intellectuals, journalist and writer Rajko Djurić, picturesquely explains the importance of the Romany language for further exploration of Roma culture and their origin: “Romany is the only book they brought from India; it constitutes their collective memory and reflects the views of this people, to themselves, to the world, and to other peoples. Their language is an inventory of the material and spiritual culture to which they once belonged, and contains elements of culture of other peoples that they came into contact with during their long and yet insufficiently studied journey.” When the Roma arrived in Europe, their lifestyle differed significantly from that of other European peoples. As a result, majorities and other groups in Europe intervened in their lives for centuries. They were forced to abandon their nomadic way of life. In the past, authorities often expelled them from their territory and they did not enjoy legal protection when violence or crimes were committed against them. Living in isolated settlements, excluded from social life, segregated, and discriminated against by others, they lived on the margins as a people without a home or a grave. At the same time, they established their parallel world as a system of social norms valid within their community, and within it all non-Roma were perceived as gadje ‘outsiders’. Roma legends explain the reasons for their nomadic way of life: they contain stories of persecution and

  4. Roma in Serbia after the Collapse of Yugoslavia: Political implications and media silence on racial violence

    Directory of Open Access Journals (Sweden)

    Nataša SIMEUNOVIĆ BAJIĆ

    2011-12-01

    Full Text Available This paper attempts to clarify the Roma issue in Serbia. Media representations of attacks against Roma are very important. The Roma are marginalized members of Serbian society. They are often the victims of violence and discrimination that are related to stereotypes and prejudice about Roma ”otherness”. The media paid special attention to the murder of Duško Jovanović in 1997 because it was the first official murder based on racial hatred. This case study shows that the topics of the assassination of the Roma are no more attractive to the media and that the “spiral of silence” occupies an important role.

  5. Prevalence of cardiovascular risk factors in relation to metabolic syndrome in the Roma population compared with the non-Roma population in the eastern part of Slovakia.

    Science.gov (United States)

    Fedacko, Ján; Pella, Daniel; Jarcuska, Peter; Siegfried, Leonard; Janicko, Martin; Veselíny, Eduard; Pella, Jozef; Sabol, Frantisek; Jarcuska, Pavol; Mareková, Mária; Gecková, Andrea Madarasová; Pazinka, Peter; Jankajová, Monika; Kmec, Ján; Babcák, Marián; Kalanin, Peter; Drazilová, Sylvia; Babinská, Ingrid; Cecetková, Beáta

    2014-03-01

    Obesity-induced metabolic syndrome is a multiple risk factor for cardiovascular (CV) risk factors and type 2 diabetes, and ethnic minorities seem to have unfavourable medical risk factors in general more frequently than majority populations. The aim of this study was to evaluate the prevalence of cardiovascular risk factors in relation to metabolic syndrome in the Roma population compared with the non-Roma population residing in the eastern part of Slovakia. 123 Roma and 79 non-Roma patients with metabolic syndrome were evaluated. Men between 40-55 years of age had 4.76-times higher odds and women 5.26-times higher odds for metabolic sydrome compared with the younger population. We found statistically significant higher waist circumference in the Roma subpopulation and higher body mass index as well, although in selected population with metabolic syndrome. HDL cholesterol was significantly lower in both Roma men and women, and LDL cholesterol was not significant in men and women with metabolic syndrome. Triglycerides levels were significantly higher in non-Roma women only. High-sensitivity C-reactive protein (hsCRP) values were not in correlation with age but were associated with the increasing number of fulfilled criteria for metabolic syndrome in both subgroups (Roma, non-Roma), independently of gender. Our study confirmed higher prevalence of obesity, metabolic syndrome and other CV risk factors associated with metabolic syndrome among younger Roma population, which may be associated with increased cardiovascular disease (CVD) morbidity and mortality among elderly Roma compared with non-Roma.

  6. Pier Luigi Nervi. Palacio de deportes, en Roma

    Directory of Open Access Journals (Sweden)

    U., J. J.

    1958-02-01

    Full Text Available El nuevo palacio de los deportes que se ha construido en Roma, Vía Tiziano, tiene una estructura resistente de hormigón armado; sus principales elementos han sido prefabricados y se ha cubierto con un casquete de forma esférica. Esta obra, de rico sabor arquitectónico, en la que se ha acentuado una vez más la necesaria identificación estructural y arquitectónica, tiene por objeto hacer frente a las necesidades que crea la proximidad de, la XVII Olimpiada, que ha de efectuarse en Roma.

  7. Insultar con gestos en la Roma antigua y hoy

    OpenAIRE

    2005-01-01

    Este articulo trata sobre el uso de algunos emblemas (esto es, gestos que, en una cultura determinada, tienen un equivalente verbal inequívoco) en la Roma clásica y su pervivencia en la época actual. Son estudiados, en concreto, los emblemas que expresan burla e insulto. Se analizan seis gestos; cuatro de ellos eran ya utilizados en Roma como gestos de mofa o insulto (imitar a la cigüeña, hacer orejas de asno, sacar la lengua y mostrar el dedo corazón); se incluyen además dos gestos que eran ...

  8. MULTIFRACTAL STRUCTURE OF CENTRAL AND EASTERN EUROPEAN FOREIGN EXCHANGE MARKETS

    Directory of Open Access Journals (Sweden)

    Cn#259;pun#351;an Rn#259;zvan

    2012-07-01

    Full Text Available It is well known that empirical data coming from financial markets, like stock market indices, commodities, interest rates, traded volumes and foreign exchange rates have a multifractal structure. Multifractals were introduced in the field of economics to surpass the shortcomings of classical models like the fractional Brownian motion or GARCH processes. In this paper we investigate the multifractal behavior of Central and Eastern European foreign exchange rates, namely the Czech koruna, Croatian kuna, Hungarian forint, Polish zlot, Romanian leu and Russian rouble with respect to euro from January 13, 2000 to February 29, 2012. The dynamics of exchange rates is of interest for investors and traders, monetary and fiscal authorities, economic agents or policy makers. The exchange rate movements affect the international balance of payments, trade flows, and allocation of the resources in national and international economy. The empirical results from the multifractal detrending fluctuation analysis algorithm show that the six exchange rate series analysed display significant multifractality. Moreover, generating shuffled and surrogate time series, we analyze the sources of multifractality, long-range correlations and heavy-tailed distributions, and we find that this multifractal behavior can be mainly attributed to the latter. Finally, we propose a foreign exchange market inefficiency ranking by considering the multifractality degree as a measure of inefficiency. The regulators, through policy instruments, aim to improve the informational inefficiency of the markets, to reduce the associated risks and to ensure economic stabilization. Evaluation of the degree of information efficiency of foreign exchange markets, for Central and Eastern Europe countries, is important to assess to what extent these countries are prepared for the transition towards fully monetary integration. The weak form efficiency implies that the past exchange rates cannot help to

  9. Multifractal and lacunarity analysis of microvascular morphology and remodeling.

    Science.gov (United States)

    Gould, Daniel J; Vadakkan, Tegy J; Poché, Ross A; Dickinson, Mary E

    2011-02-01

    Classical measures of vessel morphology, including diameter and density, are employed to study microvasculature in endothelial membrane labeled mice. These measurements prove sufficient for some studies; however, they are less well suited for quantifying changes in microcirculatory networks lacking hierarchical structure. We demonstrate that automated multifractal analysis and lacunarity may be used with classical methods to quantify microvascular morphology. Using multifractal analysis and lacunarity, we present an automated extraction tool with a processing pipeline to characterize 2D representations of 3D microvasculature. We apply our analysis on four tissues and the hyaloid vasculature during remodeling. We found that the vessel networks analyzed have multifractal geometries and that kidney microvasculature has the largest fractal dimension and the lowest lacunarity compared to microvasculature networks in the cortex, skin, and thigh muscle. Also, we found that, during hyaloid remodeling, there were differences in multifractal spectra reflecting the functional transition from a space filling vasculature which nurtures the lens to a less dense vasculature as it regresses, permitting unobstructed vision. Multifractal analysis and lacunarity are valuable additions to classical measures of vascular morphology and will have utility in future studies of normal, developing, and pathological tissues. © 2011 John Wiley & Sons Ltd.

  10. Multifractality in fidelity sequences of optimized Toffoli gates

    Science.gov (United States)

    Moqadam, Jalil Khatibi; Welter, Guilherme S.; Esquef, Paulo A. A.

    2016-11-01

    We analyze the multifractality in the fidelity sequences of several engineered Toffoli gates. Using quantum control methods, we consider several optimization problems whose global solutions realize the gate in a chain of three qubits with XY Heisenberg interaction. Applying a minimum number of control pulses assuring a fidelity above 99 % in the ideal case, we design stable gates that are less sensitive to variations in the interqubits couplings. The most stable gate has the fidelity above 91 % with variations about 0.1 %, for up to 10 % variation in the nominal couplings. We perturb the system by introducing a single source of 1 / f noise that affects all the couplings. In order to quantify the performance of the proposed optimized gates, we calculate the fidelity of a large set of optimized gates under prescribed levels of coupling perturbation. Then, we run multifractal analysis on the sequence of attained fidelities. This way, gate performance can be assessed beyond mere average results, since the chosen multifractality measure (the width of the multifractal spectrum) encapsulates into a single performance indicator the spread of fidelity values around the mean and the presence of outliers. The higher the value of the performance indicator the more concentrated around the mean the fidelity values are and rarer is the occurrence of outliers. The results of the multifractal analysis on the fidelity sequences demonstrate the effectiveness of the proposed optimized gate implementations, in the sense they are rendered less sensitive to variations in the interqubits coupling strengths.

  11. Multifractal detrended fluctuation analysis of optogenetic modulation of neural activity

    Science.gov (United States)

    Kumar, S.; Gu, L.; Ghosh, N.; Mohanty, S. K.

    2013-02-01

    Here, we introduce a computational procedure to examine whether optogenetically activated neuronal firing recordings could be characterized as multifractal series. Optogenetics is emerging as a valuable experimental tool and a promising approach for studying a variety of neurological disorders in animal models. The spiking patterns from cortical region of the brain of optogenetically-stimulated transgenic mice were analyzed using a sophisticated fluctuation analysis method known as multifractal detrended fluctuation analysis (MFDFA). We observed that the optogenetically-stimulated neural firings are consistent with a multifractal process. Further, we used MFDFA to monitor the effect of chemically induced pain (formalin injection) and optogenetic treatment used to relieve the pain. In this case, dramatic changes in parameters characterizing a multifractal series were observed. Both the generalized Hurst exponent and width of singularity spectrum effectively differentiates the neural activities during control and pain induction phases. The quantitative nature of the analysis equips us with better measures to quantify pain. Further, it provided a measure for effectiveness of the optogenetic stimulation in inhibiting pain. MFDFA-analysis of spiking data from other deep regions of the brain also turned out to be multifractal in nature, with subtle differences in the parameters during pain-induction by formalin injection and inhibition by optogenetic stimulation. Characterization of neuronal firing patterns using MFDFA will lead to better understanding of neuronal response to optogenetic activation and overall circuitry involved in the process.

  12. Antenatal characteristics of Roma female population in Virovitica-Podravina County, Croatia

    Science.gov (United States)

    Šegregur, Domagoj

    2017-01-01

    Abstract Introduction This study reports about antenatal characteristics of Roma minority population. The study was designed to investigate data about health behaviours known to be associated with reproductive outcomes of Roma women that have very good living conditions and relatively high resource availability. Methods A retrospective study included 204 Roma and 408 non-Roma hospitalised singleton births that occurred in the Maternity Ward of the General Hospital Virovitica in the period from 1991 to 2010. Data about women’s age, marital status, smoking, reproductive health (abortions, delivery), antenatal care, perinatal complications and gestational age were taken from hospital records and analysed. Results Roma women were averagely more than three years younger than non-Roma women, only 10.8% were married. Smoking was more frequent. The average number of births of Roma and non-Roma women was similar, averagely two children per woman. The rate of induced abortions in the Roma women was higher, while the frequency of spontaneous abortions was equal. Inadequate antenatal care of Roma women was associated with two times higher incidence of perinatal complications. A higher frequency of deliveries at home without professional assistance in Roma pregnancy resulted in lower perinatal outcomes. It was confirmed that Roma mothers give birth earlier (38+6 vs. 39+4 weeks) and have a higher incidence of premature births (9.3% vs. 2.2%). Conclusions In the comparison of antenatal parameters between the two researched groups, poorer prenatal outcomes in the Roma population were found, despite full integration and considerable improvement in living standards of this ethnic Roma population. PMID:28289463

  13. Improved moment scaling estimation for multifractal signals

    Directory of Open Access Journals (Sweden)

    D. Veneziano

    2009-11-01

    Full Text Available A fundamental problem in the analysis of multifractal processes is to estimate the scaling exponent K(q of moments of different order q from data. Conventional estimators use the empirical moments μ^rq=⟨ | εr(τ|q of wavelet coefficients εr(τ, where τ is location and r is resolution. For stationary measures one usually considers "wavelets of order 0" (averages, whereas for functions with multifractal increments one must use wavelets of order at least 1. One obtains K^(q as the slope of log( μ^rq against log(r over a range of r. Negative moments are sensitive to measurement noise and quantization. For them, one typically uses only the local maxima of | εr(τ| (modulus maxima methods. For the positive moments, we modify the standard estimator K^(q to significantly reduce its variance at the expense of a modest increase in the bias. This is done by separately estimating K(q from sub-records and averaging the results. For the negative moments, we show that the standard modulus maxima estimator is biased and, in the case of additive noise or quantization, is not applicable with wavelets of order 1 or higher. For these cases we propose alternative estimators. We also consider the fitting of parametric models of K(q and show how, by splitting the record into sub-records as indicated above, the accuracy of standard methods can be significantly improved.

  14. Research on the relationship between the multifractality and long memory of realized volatility in the SSECI

    Science.gov (United States)

    Jia, Zhanliang; Cui, Meilan; Li, Handong

    2012-02-01

    We examine the multifractal properties of the realized volatility (RV) and realized bipower variation (RBV) series in the Shanghai Stock Exchange Composite Index (SSECI) by using the multifractal detrended fluctuation analysis (MF-DFA) method. We find that there exist distinct multifractal characteristics in the volatility series. The contributions of two different types of source of multifractality, namely, fat-tailed probability distributions and nonlinear temporal correlations, are studied. By using the unit root test, we also find the strength of the multifractality of the volatility time series is insensitive to the sampling frequency but that the long memory of these series is sensitive.

  15. Multifractal analysis of atmospheric sub-micron particle data

    Science.gov (United States)

    Arizabalo, Rubén Darío; González-Ávalos, Eugenio; Korvin, Gabor

    2015-03-01

    Multifractal analysis was used to describe air pollution by sub-micrometric atmospheric particles. Atmospheric particle concentrations were studied from March 31 to April 21, 2006, as part of the MILAGRO campaign at the Jasso Station by means of an SMPS. Sixteen campaign days were selected to carry out the multifractal analysis of the experimental data through Singularity Spectra f(α). In this work, the roughness/smoothness feature of atmospheric particle distributions was studied by means of the Hölder exponent (α), which can be associated with the intensity of particle emissions through time and the randomness of the external emission sources. Multifractal analysis has been found to be a useful tool to establish intensity fluctuations of atmospheric data.

  16. Automatic detection of microcalcifications with multi-fractal spectrum.

    Science.gov (United States)

    Ding, Yong; Dai, Hang; Zhang, Hang

    2014-01-01

    For improving the detection of micro-calcifications (MCs), this paper proposes an automatic detection of MC system making use of multi-fractal spectrum in digitized mammograms. The approach of automatic detection system is based on the principle that normal tissues possess certain fractal properties which change along with the presence of MCs. In this system, multi-fractal spectrum is applied to reveal such fractal properties. By quantifying the deviations of multi-fractal spectrums between normal tissues and MCs, the system can identify MCs altering the fractal properties and finally locate the position of MCs. The performance of the proposed system is compared with the leading automatic detection systems in a mammographic image database. Experimental results demonstrate that the proposed system is statistically superior to most of the compared systems and delivers a superior performance.

  17. Coupled uncertainty provided by a multifractal random walker

    Energy Technology Data Exchange (ETDEWEB)

    Koohi Lai, Z. [Department of Physics, Firoozkooh Branch, Islamic Azad University, Firoozkooh (Iran, Islamic Republic of); Vasheghani Farahani, S. [Department of Physics, Tafresh University, P.O. Box 39518-79611, Tafresh (Iran, Islamic Republic of); Movahed, S.M.S. [Department of Physics, Shahid Beheshti University, G.C., Evin, Tehran 19839 (Iran, Islamic Republic of); The Abdus Salam International Centre for Theoretical Physics, Strada Costiera, 11, Trieste 34151 (Italy); Jafari, G.R., E-mail: g_jafari@sbu.ac.ir [Department of Physics, Shahid Beheshti University, G.C., Evin, Tehran 19839 (Iran, Islamic Republic of)

    2015-10-09

    The aim here is to study the concept of pairing multifractality between time series possessing non-Gaussian distributions. The increasing number of rare events creates “criticality”. We show how the pairing between two series is affected by rare events, which we call “coupled criticality”. A method is proposed for studying the coupled criticality born out of the interaction between two series, using the bivariate multifractal random walk (BiMRW). This method allows studying dependence of the coupled criticality on the criticality of each individual system. This approach is applied to data sets of gold and oil markets, and inflation and unemployment. - Highlights: • The coupled criticality between two systems is modeled by the bivariate multifractal random walk. • This coupled criticality is generally directed. • This coupled criticality is inversely proportional to the criticality of either of the systems. • The coupled criticality can emerge when at least one of the systems posses a Gaussian distribution.

  18. Multifractal Detrended Cross-Correlation Analysis of agricultural futures markets

    Energy Technology Data Exchange (ETDEWEB)

    He Lingyun, E-mail: lyhe@amss.ac.cn [Center for Futures and Financial Derivatives, College of Economics and Management, China Agricultural University, Beijing 100083 (China); Chen Shupeng [Center for Futures and Financial Derivatives, College of Economics and Management, China Agricultural University, Beijing 100083 (China)

    2011-06-15

    Highlights: > We investigated cross-correlations between China's and US agricultural futures markets. > Power-law cross-correlations are found between the geographically far but correlated markets. > Multifractal features are significant in all the markets. > Cross-correlation exponent is less than averaged GHE when q < 0 and greater than the latter when q > 0. - Abstract: We investigated geographically far but temporally correlated China's and US agricultural futures markets. We found that there exists a power-law cross-correlation between them, and that multifractal features are significant in all the markets. It is very interesting that the geographically far markets show strong cross-correlations and share much of their multifractal structure. Furthermore, we found that for all the agricultural futures markets in our studies, the cross-correlation exponent is less than the averaged generalized Hurst exponents (GHE) when q < 0 and greater than the averaged GHE when q > 0.

  19. Multi-Fraction Bayesian Sediment Transport Model

    Directory of Open Access Journals (Sweden)

    Mark L. Schmelter

    2015-09-01

    Full Text Available A Bayesian approach to sediment transport modeling can provide a strong basis for evaluating and propagating model uncertainty, which can be useful in transport applications. Previous work in developing and applying Bayesian sediment transport models used a single grain size fraction or characterized the transport of mixed-size sediment with a single characteristic grain size. Although this approach is common in sediment transport modeling, it precludes the possibility of capturing processes that cause mixed-size sediments to sort and, thereby, alter the grain size available for transport and the transport rates themselves. This paper extends development of a Bayesian transport model from one to k fractional dimensions. The model uses an existing transport function as its deterministic core and is applied to the dataset used to originally develop the function. The Bayesian multi-fraction model is able to infer the posterior distributions for essential model parameters and replicates predictive distributions of both bulk and fractional transport. Further, the inferred posterior distributions are used to evaluate parametric and other sources of variability in relations representing mixed-size interactions in the original model. Successful OPEN ACCESS J. Mar. Sci. Eng. 2015, 3 1067 development of the model demonstrates that Bayesian methods can be used to provide a robust and rigorous basis for quantifying uncertainty in mixed-size sediment transport. Such a method has heretofore been unavailable and allows for the propagation of uncertainty in sediment transport applications.

  20. Exoplanetary Detection by Multifractal Spectral Analysis

    Science.gov (United States)

    Agarwal, Sahil; Del Sordo, Fabio; Wettlaufer, John S.

    2017-01-01

    Owing to technological advances, the number of exoplanets discovered has risen dramatically in the last few years. However, when trying to observe Earth analogs, it is often difficult to test the veracity of detection. We have developed a new approach to the analysis of exoplanetary spectral observations based on temporal multifractality, which identifies timescales that characterize planetary orbital motion around the host star and those that arise from stellar features such as spots. Without fitting stellar models to spectral data, we show how the planetary signal can be robustly detected from noisy data using noise amplitude as a source of information. For observation of transiting planets, combining this method with simple geometry allows us to relate the timescales obtained to primary and secondary eclipse of the exoplanets. Making use of data obtained with ground-based and space-based observations we have tested our approach on HD 189733b. Moreover, we have investigated the use of this technique in measuring planetary orbital motion via Doppler shift detection. Finally, we have analyzed synthetic spectra obtained using the SOAP 2.0 tool, which simulates a stellar spectrum and the influence of the presence of a planet or a spot on that spectrum over one orbital period. We have demonstrated that, so long as the signal-to-noise-ratio ≥ 75, our approach reconstructs the planetary orbital period, as well as the rotation period of a spot on the stellar surface.

  1. Multifractal behavior of commodity markets: Fuel versus non-fuel products

    Science.gov (United States)

    Delbianco, Fernando; Tohmé, Fernando; Stosic, Tatijana; Stosic, Borko

    2016-09-01

    We investigate multifractal properties of commodity time series using multifractal detrended fluctuation analysis (MF-DFA). We find that agricultural and energy-related commodities exhibit very similar behavior, while the multifractal behavior of daily and monthly commodity series is rather different. Daily series demonstrate overall uncorrelated behavior, lower degree of multifractality and the dominance of small fluctuations. On the other hand, monthly commodity series show overall persistent behavior, higher degree of multifractality and the dominance of large fluctuations. After shuffling the series, we find that the multifractality is due to a broad probability density function for daily commodities series, while for monthly commodities series multifractality is caused by both a broad probability density function and long term correlations.

  2. Lacunarity Analyses of Multifractal and Natural Grayscale Patterns

    Science.gov (United States)

    Roy, Ankur; Perfect, Edmund

    2014-09-01

    Lacunarity (L) is a scale (r)-dependent parameter that was developed for quantifying clustering in fractals and has subsequently been employed to characterize various natural patterns. For multifractals it can be shown analytically that L is related to the correlation dimension, D2, by: dlog(L)/dlog(r) = D2 - 2. We empirically tested this equation using two-dimensional multifractal grayscale patterns with known correlation dimensions. These patterns were analyzed for their lacunarity using the gliding-box algorithm. D2 values computed from the dlog(L)/dlog(r) analysis gave a 1:1 relationship with the known D2 values. Lacunarity analysis was also employed in discriminating between multifractal grayscale patterns with the same D2 values, but different degrees of scale-dependent clustering. For this purpose, a new lacunarity parameter, , was formulated based on the weighted mean of the log-transformed lacunarity values at different scales. This approach was further used to evaluate scale-dependent clustering in soil thin section grayscale images that had previously been classified as multifractals based on standard method of moments box-counting. Our results indicate that lacunarity analysis may be a more sensitive indicator of multifractal behavior in natural grayscale patterns than the standard approach. Thus, multifractal behavior can be checked without having to compute the whole spectrum of non-integer dimensions, Dq(-∞ parameter should be useful to researchers who want to explore the correlative influence of clustering on flow and transport in grayscale representations of soil aggregates and heterogeneous aquifers.

  3. Giuseppe Cafiero sulle orme di Joyce a Roma

    Directory of Open Access Journals (Sweden)

    Carla De Petris

    2011-08-01

    Full Text Available In 2006 Giuseppe Cafiero published James Joyce, Roma & altre storie, a novel with thriller-like undertones that weaves stories around the author of Ulysses. In her conversation with the author, Carla de Petris investigates the genesis of the novel and reflects on the post-modernist stances of its complex plot.

  4. From Policy to Practice: Roma Education in Albania and Sweden

    Science.gov (United States)

    Avery, Helen; Hoxhallari, Itena

    2017-01-01

    This paper aims to make a contribution to recentering practice- and practitioner-oriented issues in Roma education studies. Gaps can be observed today between conditions of educational work in practice and the ways education is understood in mainstream academic discussions, compounded by the fact that educational workers in the field have limited…

  5. Education of Roma Youth in Hungary: Schools, Identities and Belonging

    Science.gov (United States)

    Dunajeva, Jekatyerina

    2017-01-01

    Historically, schools have been homogenizing institutions that often disadvantaged people of color and ethnic and religious minorities. In this article I examine Roma education in Hungary, focusing on (re)production of racial identities and the negotiation of ethnic labels. I distinguish two models of education as they relate to ideas of…

  6. Roma Mediators in Europe: A New Council of Europe Programme

    Science.gov (United States)

    Kyuchukov, Hristo

    2012-01-01

    In several European countries the number of the Roma represents approximately 10% of the total population. Due to the global economic crisis, the rise of the far right in places like Hungary, and failed policies of the past, their present social and economic situation continues to become more vulnerable. Mediation is one of the measures used…

  7. Creativity and Anxiety in Roma and Serbian Adolescents

    Science.gov (United States)

    Spasic, Miljana

    2016-01-01

    In this paper, we present a research whose aim was to investigate the relationship between creativity and anxiety during the period of early adolescence. Furthermore, we were interested in discovering potential differences among Roma and Serbian adolescents at the level of creativity, situational and general anxiety. The sample consisted of 60…

  8. Origins, admixture and founder lineages in European Roma

    NARCIS (Netherlands)

    Martinez-Cruz, B.; Mendizabal, I.; Harmant, C.; Pablo, R. de; Ioana, M.; Angelicheva, D.; Kouvatsi, A.; Makukh, H.; Netea, M.G.; Pamjav, H.; Zalan, A.; Tournev, I.; Marushiakova, E.; Popov, V.; Bertranpetit, J.; Kalaydjieva, L.; Quintana-Murci, L.; Comas, D.

    2016-01-01

    The Roma, also known as 'Gypsies', represent the largest and the most widespread ethnic minority of Europe. There is increasing evidence, based on linguistic, anthropological and genetic data, to suggest that they originated from the Indian subcontinent, with subsequent bottlenecks and undetermined

  9. Roma Mediators in Europe: A New Council of Europe Programme

    Science.gov (United States)

    Kyuchukov, Hristo

    2012-01-01

    In several European countries the number of the Roma represents approximately 10% of the total population. Due to the global economic crisis, the rise of the far right in places like Hungary, and failed policies of the past, their present social and economic situation continues to become more vulnerable. Mediation is one of the measures used…

  10. Handbook for Improving the Living Conditions of Roma

    OpenAIRE

    World Bank; European Commission

    2014-01-01

    A disproportionately large number of Roma in Europe today face deep poverty, social exclusion, and poor living conditions. Improving these is critical to achieving the targets of the Europe 2020 Strategy, the European Union s 10-year growth strategy, which aims to reduce poverty, social exclusion, early school leaving, and increase school attainment and employment by 2020. The EU Framework...

  11. Multifractal properties of solar wind turbulence: theory and observations.

    Science.gov (United States)

    Milovanov, A. V.; Avanov, L. A.; Zastenker, G. N.; Zelenyj, L. M.

    1996-10-01

    A fractal model of the solar wind is presented. This model treats fluctuations of the solar wind velocity from the viewpoint of nonlinear processes originating in the convective region and photosphere of the Sun. The multifractal structure of proton velocity fluctuations in a region of heliocentric distances from 0.2 to 0.8 AU is a result of these processes. Continuous measurements of solar wind velocity aboard the ISEE-3 spacecraft during one month were used to compare the theoretical and experimental results. It is shown that fluctuations of proton velocity have a multifractal structure in a frequency range of 10-5 - 10-3Hz.

  12. Apparent scale correlations in a random multifractal process

    DEFF Research Database (Denmark)

    Cleve, Jochen; Schmiegel, Jürgen; Greiner, Martin

    2008-01-01

    We discuss various properties of a homogeneous random multifractal process, which are related to the issue of scale correlations. By design, the process has no built-in scale correlations. However, when it comes to observables like breakdown coefficients, which are based on a coarse......-graining of the multifractal field, scale correlations do appear. In the log-normal limit of the model process, the conditional distributions and moments of breakdown coefficients reproduce the observations made in fully developed small-scale turbulence. These findings help to understand several puzzling empirical details...

  13. Multifractal analysis of dynamic infrared imaging of breast cancer

    Science.gov (United States)

    Gerasimova, E.; Audit, B.; Roux, S. G.; Khalil, A.; Argoul, F.; Naimark, O.; Arneodo, A.

    2013-12-01

    The wavelet transform modulus maxima (WTMM) method was used in a multifractal analysis of skin breast temperature time-series recorded using dynamic infrared (IR) thermography. Multifractal scaling was found for healthy breasts as the signature of a continuous change in the shape of the probability density function (pdf) of temperature fluctuations across time scales from \\sim0.3 to 3 s. In contrast, temperature time-series from breasts with malignant tumors showed homogeneous monofractal temperature fluctuations statistics. These results highlight dynamic IR imaging as a very valuable non-invasive technique for preliminary screening in asymptomatic women to identify those with risk of breast cancer.

  14. Variable bit rate video traffic modeling by multiplicative multifractal model

    Institute of Scientific and Technical Information of China (English)

    Huang Xiaodong; Zhou Yuanhua; Zhang Rongfu

    2006-01-01

    Multiplicative multifractal process could well model video traffic. The multiplier distributions in the multiplicative multifractal model for video traffic are investigated and it is found that Gaussian is not suitable for describing the multipliers on the small time scales. A new statistical distribution-symmetric Pareto distribution is introduced. It is applied instead of Gaussian for the multipliers on those scales. Based on that, the algorithm is updated so that symmetric pareto distribution and Gaussian distribution are used to model video traffic but on different time scales. The simulation results demonstrate that the algorithm could model video traffic more accurately.

  15. Coupled uncertainty provided by a multifractal random walker

    CERN Document Server

    Lai, Z Koohi; Movahed, S M S; Jafari, G R

    2015-01-01

    The aim here is to study the concept of pairing multifractality between time series possessing non-Gaussian distributions. The increasing number of rare events creates "criticality". We show how the pairing between two series is affected by rare events, which we call "coupled criticality". A method is proposed for studying the coupled criticality born out of the interaction between two series, using the bivariate multifractal random walk (BiMRW). This method allows studying dependence of the coupled criticality on the criticality of each individual system. This approach is applied to data sets of gold and oil markets, and inflation and unemployment.

  16. Multi-fractal analysis of highway traffic data

    Institute of Scientific and Technical Information of China (English)

    Shang Peng-Jian; Shen Jin-Sheng

    2007-01-01

    The purpose of the present study is to investigate the presence of multi-fractal behaviours in the traffic time series not only by statistical approaches but also by geometrical approaches. The pointwise H(o)lder exponent of a function is calculated by developing an algorithm for the numerical evaluation of H(o)lder exponent of time series. The traffic time series observed on the Beijing Yuquanying highway are analysed. The results from all these methods indicate that the traffic data exhibit the multi-fractal behaviour.

  17. Reconstructing the Indian origin and dispersal of the European Roma: a maternal genetic perspective.

    Directory of Open Access Journals (Sweden)

    Isabel Mendizabal

    Full Text Available Previous genetic, anthropological and linguistic studies have shown that Roma (Gypsies constitute a founder population dispersed throughout Europe whose origins might be traced to the Indian subcontinent. Linguistic and anthropological evidence point to Indo-Aryan ethnic groups from North-western India as the ancestral parental population of Roma. Recently, a strong genetic hint supporting this theory came from a study of a private mutation causing primary congenital glaucoma. In the present study, complete mitochondrial control sequences of Iberian Roma and previously published maternal lineages of other European Roma were analyzed in order to establish the genetic affinities among Roma groups, determine the degree of admixture with neighbouring populations, infer the migration routes followed since the first arrival to Europe, and survey the origin of Roma within the Indian subcontinent. Our results show that the maternal lineage composition in the Roma groups follows a pattern of different migration routes, with several founder effects, and low effective population sizes along their dispersal. Our data allowed the confirmation of a North/West migration route shared by Polish, Lithuanian and Iberian Roma. Additionally, eleven Roma founder lineages were identified and degrees of admixture with host populations were estimated. Finally, the comparison with an extensive database of Indian sequences allowed us to identify the Punjab state, in North-western India, as the putative ancestral homeland of the European Roma, in agreement with previous linguistic and anthropological studies.

  18. Characteristics of gonorrhea and syphilis cases among the Roma ethnic group in Belgrade, Serbia.

    Science.gov (United States)

    Bjekić, Milan; Vlajinac, Hristina; Šipetić-Grujičić, Sandra

    2016-01-01

    The Roma ethnic group is the largest and most marginalized minority in Europe, believed to be vulnerable to sexually transmitted infections. The purpose of the study was to investigate frequency and characteristics of gonorrhea and syphilis among the Roma population in Belgrade. Data from the City Institute for Skin and Venereal Diseases to which all gonorrhea and syphilis cases are referred were analyzed. During the period of 2010-2014 sexually transmitted infections were more frequent among Roma than in rest of Belgrade population. Average percentages of Roma among all reported subjects with syphilis and those with gonorrhea were 9.6% and 13.5%, respectively, while the percentage of Roma in the total Belgrade population was about 1.6%. Roma with syphilis and gonorrhea were more frequently men (75%), most frequently aged 20-29 years (43.4%), never married (64.5%), with elementary school or less (59.2%), unemployed (80.3%), and heterosexual (89.5%). Among Roma 10.5% were sex workers and 68.4% did not know the source of their infection. Significant differences between Roma cases and other cases in Belgrade in all characteristics observed were in agreement with differences between Roma population and the total population of Serbia. The present study confirmed the vulnerability of the Roma population to sexually transmitted infections. Copyright © 2016 Elsevier Editora Ltda. All rights reserved.

  19. Reconstructing the Indian Origin and Dispersal of the European Roma: A Maternal Genetic Perspective

    Science.gov (United States)

    Mendizabal, Isabel; Valente, Cristina; Gusmão, Alfredo; Alves, Cíntia; Gomes, Verónica; Goios, Ana; Parson, Walther; Calafell, Francesc; Alvarez, Luis; Amorim, António; Gusmão, Leonor

    2011-01-01

    Previous genetic, anthropological and linguistic studies have shown that Roma (Gypsies) constitute a founder population dispersed throughout Europe whose origins might be traced to the Indian subcontinent. Linguistic and anthropological evidence point to Indo-Aryan ethnic groups from North-western India as the ancestral parental population of Roma. Recently, a strong genetic hint supporting this theory came from a study of a private mutation causing primary congenital glaucoma. In the present study, complete mitochondrial control sequences of Iberian Roma and previously published maternal lineages of other European Roma were analyzed in order to establish the genetic affinities among Roma groups, determine the degree of admixture with neighbouring populations, infer the migration routes followed since the first arrival to Europe, and survey the origin of Roma within the Indian subcontinent. Our results show that the maternal lineage composition in the Roma groups follows a pattern of different migration routes, with several founder effects, and low effective population sizes along their dispersal. Our data allowed the confirmation of a North/West migration route shared by Polish, Lithuanian and Iberian Roma. Additionally, eleven Roma founder lineages were identified and degrees of admixture with host populations were estimated. Finally, the comparison with an extensive database of Indian sequences allowed us to identify the Punjab state, in North-western India, as the putative ancestral homeland of the European Roma, in agreement with previous linguistic and anthropological studies. PMID:21264345

  20. Biomarkers associated with obesity and overweight in the Roma population residing in eastern Slovakia.

    Science.gov (United States)

    Petrásová, Darina; Bertková, Izabela; Petrásová, Miroslava; Hijová, Emília; Mareková, Mária; Babinská, Ingrid; Jarcuska, Peter; Pella, Daniel; Gecková, Andrea Madarasová

    2014-03-01

    Obesity and overweight are major contributors to the global burden of chronic diseases and disability in both majority and minority populations. Data from the cross-sectional population-based HepaMeta study conducted in Slovakia in 2011 were used. The sample comprised a total of 452 Roma. Measurements of special bioactive mediators were taken in final groups consisting of 63 male Roma respondents (mean age = 32.59; SD = 8.63) and 117 female Roma respondents (mean age = 34.55; SD = 8.35). Respondents were divided into three groups: those with normal weight, those with overweight and obese. Values for anthropometric parameters, lipids parameters, C-reactive protein, TNF-alpha, IL-6, leptin, and adiponectin were determined. 27.6% of examined Roma females and 26.9% of males were overweight. Obesity (BMI > 30.0 kg/m2) appeared in a higher proportion of males (28.8%) compared with female (26.5%). Mean levels of total cholesterol, triacylglycerol and LDL-cholesterol were significantly elevated in the overweight and obese subjects compared to normal-weight Roma respondents. The relation was reversed for HDL-C level, with significantly decreased levels in both male and female obese Roma (p Roma male p Roma female p Roma significantly with increasing BMI. The study is the first one to provide data about selected biomarkers. Results may be useful in predicting obesity and its related diseases in the Roma population from the eastern part of Slovakia.

  1. Reconstructing the Indian origin and dispersal of the European Roma: a maternal genetic perspective.

    Science.gov (United States)

    Mendizabal, Isabel; Valente, Cristina; Gusmão, Alfredo; Alves, Cíntia; Gomes, Verónica; Goios, Ana; Parson, Walther; Calafell, Francesc; Alvarez, Luis; Amorim, António; Gusmão, Leonor; Comas, David; Prata, Maria João

    2011-01-10

    Previous genetic, anthropological and linguistic studies have shown that Roma (Gypsies) constitute a founder population dispersed throughout Europe whose origins might be traced to the Indian subcontinent. Linguistic and anthropological evidence point to Indo-Aryan ethnic groups from North-western India as the ancestral parental population of Roma. Recently, a strong genetic hint supporting this theory came from a study of a private mutation causing primary congenital glaucoma. In the present study, complete mitochondrial control sequences of Iberian Roma and previously published maternal lineages of other European Roma were analyzed in order to establish the genetic affinities among Roma groups, determine the degree of admixture with neighbouring populations, infer the migration routes followed since the first arrival to Europe, and survey the origin of Roma within the Indian subcontinent. Our results show that the maternal lineage composition in the Roma groups follows a pattern of different migration routes, with several founder effects, and low effective population sizes along their dispersal. Our data allowed the confirmation of a North/West migration route shared by Polish, Lithuanian and Iberian Roma. Additionally, eleven Roma founder lineages were identified and degrees of admixture with host populations were estimated. Finally, the comparison with an extensive database of Indian sequences allowed us to identify the Punjab state, in North-western India, as the putative ancestral homeland of the European Roma, in agreement with previous linguistic and anthropological studies.

  2. Characteristics of gonorrhea and syphilis cases among the Roma ethnic group in Belgrade, Serbia

    Directory of Open Access Journals (Sweden)

    Milan Bjekić

    Full Text Available Abstract Background The Roma ethnic group is the largest and most marginalized minority in Europe, believed to be vulnerable to sexually transmitted infections. Aim The purpose of the study was to investigate frequency and characteristics of gonorrhea and syphilis among the Roma population in Belgrade. Methods Data from the City Institute for Skin and Venereal Diseases to which all gonorrhea and syphilis cases are referred were analyzed. Results During the period of 2010–2014 sexually transmitted infections were more frequent among Roma than in rest of Belgrade population. Average percentages of Roma among all reported subjects with syphilis and those with gonorrhea were 9.6% and 13.5%, respectively, while the percentage of Roma in the total Belgrade population was about 1.6%. Roma with syphilis and gonorrhea were more frequently men (75%, most frequently aged 20–29 years (43.4%, never married (64.5%, with elementary school or less (59.2%, unemployed (80.3%, and heterosexual (89.5%. Among Roma 10.5% were sex workers and 68.4% did not know the source of their infection. Significant differences between Roma cases and other cases in Belgrade in all characteristics observed were in agreement with differences between Roma population and the total population of Serbia. Conclusion The present study confirmed the vulnerability of the Roma population to sexually transmitted infections.

  3. The health status of Roma children--a medical or social issue?

    Science.gov (United States)

    Djurovic, D; Prcic, S; Milojkovic, M; Konstantinidis, G; Tamburlini, G

    2014-01-01

    Most studies dealing with health problems of the Roma population suggests that a low economic status significantly contributes to their overall poor health. In Serbia, Roma people are members of a marginalized ethnic group with a low socioeconomic status which contributes to their much higher morbidity and mortality rate compared with the majority population. The questions we asked in this paper were: Are Roma children discriminated during hospital care? Do they get the same treatment as the non-Roma children? To answer these questions, we examined medical records of 59 Roma children and compared with 59 records of non-Roma children in order to determine whether there are any differences in the health status, as well as the length, course, outcome, and cost of treatment. Roma children have statistically significant more comorbidity, more malnutritions, more skin diseases (especially parasitic and fungal infections) and were more frequently anemic. Also, the length of hospitalization of Roma children was significantly higher, as well as the number of laboratory tests performed and number of drugs prescribed, which contribute to the significantly higher costs of treatment for Roma children compared to non-Roma children. However, a significantly lower number of Roma children were discharged as "completely cured". The results of our study does not support hypothesis of discrimination of Roma children concerning medical treatment in observed hospital. At the same time, our results suggests that social interventions (e.g. hygienic housing, water supply, etc.) and prevention measures could prevent necessity of hospitalized treatment of Roma children and could diminish the drain on the health budget spent on treating the consequences of social neglect.

  4. Risk factors for childhood malnutrition in Roma settlements in Serbia

    Directory of Open Access Journals (Sweden)

    Janevic Teresa

    2010-08-01

    Full Text Available Abstract Background Children living in Roma settlements in Central and Eastern Europe face extreme levels of social exclusion and poverty, but their health status has not been well studied. The objective of this study was to elucidate risk factors for malnutrition in children in Roma settlements in Serbia. Methods Anthropometric and sociodemographic measures were obtained for 1192 Roma children under five living in Roma settlements from the 2005 Serbia Multiple Indicator Cluster Survey. Multiple logistic regression was used to relate family and child characteristics to the odds of stunting, wasting, and underweight. Results The prevalence of stunting, wasting, and underweight was 20.1%, 4.3%, and 8.0%, respectively. Nearly all of the children studied fell into the lowest quintile of wealth for the overall population of Serbia. Children in the lowest quintile of wealth were four times more likely to be stunted compared to those in the highest quintile, followed by those in the second lowest quintile (AOR = 2.1 and lastly by those in the middle quintile (AOR = 1.6. Children who were ever left in the care of an older child were almost twice as likely to stunted as those were not. Children living in urban settlements showed a clear disadvantage with close to three times the likelihood of being wasted compared to those living in rural areas. There was a suggestion that maternal, but not paternal, education was associated with stunting, and maternal literacy was significantly associated with wasting. Whether children were ever breastfed, immunized or had diarrhoeal episodes in the past two weeks did not show strong correlations to children malnutrition status in this Roma population. Conclusions There exists a gradient relationship between household wealth and stunting even within impoverished settlements, indicating that among poor and marginalized populations socioeconomic inequities in child health should be addressed. Other areas on which to focus

  5. Lived experience of vulnerability from a Gypsy Roma Traveller perspective.

    Science.gov (United States)

    Heaslip, Vanessa; Hean, Sarah; Parker, Jonathan

    2016-07-01

    To describe the lived experience of vulnerability of individuals within a Gypsy Roma Travelling community. People experience vulnerability whenever their health or usual functioning is compromised. This may increase when they enter unfamiliar surroundings, situations or relationships. One's experience of vulnerability can also be heightened through interactions between the individual and the society within which they live. Gypsy Roma Travellers are often identified as vulnerable owing to increased morbidity and mortality as well as their marginalised status within society. Yet little is known of the experiences of vulnerability by the individuals themselves. Without their stories and experiences, health professionals cannot effectively develop services that meet their needs. This descriptive phenomenological study sought to explore the lived experience of vulnerability in a Gypsy Roma Travelling community. Seventeen Gypsy Roma Travellers were interviewed in 2013-2014 about their experiences of feeling vulnerable. This paper reports on the findings from the depth phase in which 13 individuals were interviewed. The interviews were conducted and analysed using Giorgi's descriptive phenomenological approach. Six constituents of the phenomenon of vulnerability were identified as feeling: defined and homogenised as a group; pressurised to conform to live in a particular way; split in one's identity; a loss of one's heritage; discriminated, persecuted and threatened; and powerlessness. There is a wealth of evidence that Gypsy Roma Travellers experience high levels of morbidity and mortality, which has led to them being identified by health professionals and policy makers as a vulnerable community. Exploring their lived experience of vulnerability presents a different perspective regarding this concept and can help explain why they may experience poorer levels of physical and mental health. © 2016 John Wiley & Sons Ltd.

  6. Roma Women's Perspectives on End-of-Life Decisions.

    Science.gov (United States)

    Peinado-Gorlat, Patricia; Castro-Martínez, Francisco Javier; Arriba-Marcos, Beatriz; Melguizo-Jiménez, Miguel; Barrio-Cantalejo, Inés

    2015-12-01

    Spain's Roma community has its own cultural and moral values. These values influence the way in which end-of-life decision-making is confronted. The objective of this study was to explore the perspective of Roma women on end-of-life decision-making. It was a qualitative study involving thirty-three Roma women belonging to groups for training and social development in two municipalities. We brought together five focus groups between February and December 2012. Six mediators each recruited five to six participants. We considered age and care role to be the variables that can have the most influence on opinion regarding end-of-life decision-making. We considered the discussion saturated when the ideas expressed were repeated. Data analysis was carried out according to five steps: describing, organizing, connecting, corroborating/legitimating, and representing the account. The main ideas gleaned from the data were as follows: (1) the important role of the family in end-of-life care, especially the role of women; (2) the large influence of community opinion over personal or family decisions, typical of closed societies; (3) the different preferences women had for themselves compared to that for others regarding desired end-of-life care; (4) unawareness or rejection of advance directives. Roma women wish for their healthcare preferences to be taken into account, but "not in writing." The study concluded that the success of end-of-life healthcare in Roma families and of their involvement in the making of healthcare decisions depends upon considering and respecting their idiosyncrasy.

  7. Roma Ordusunda Beslenme Düzeni

    Directory of Open Access Journals (Sweden)

    Olcay TURAN

    2016-12-01

    Full Text Available Tarih boyunca ortaya çıkmış önemli devletlerin tamamı varlıklarını korumak ve sürdürebilmek için güçlü silahlı kuvvetlere ihtiyaç duymuşlardır. Bir ordunun savaşta ve barışta güçlü olmasını sağlayan pek çok etken söz konusudur. Komuta kademesinin becerisi, uygulanan taktikler, çağa ayak uydurabilme becerisi ve kullandıkları silah araç ve gereçleri bir ordunun güçlü olabilmesinin en önemli faktörleri asında yer almaktadır. Fakat tüm bu şartlar sağlanmış olsa bile sürdürülebilir bir lojistik olmadan başarısızlık kaçınılmaz olacaktır. Bu bağlamda Roma’da hem Cumhuriyet hem de İmparatorluk dönemlerinde askeri başarılar elde etmesinin temelinde sürdürülebilir bir lojistiğe sahip olması yatmaktadır. Eskiçağ tarihi içerisinde lojistikten kasıt ise askerler için gerekli yiyecek ve içeceğin temin edilmesidir. Roma da kurulduğu andan itibaren askerlerin bedensel ihtiyaçlarını gerçekleştirmek gayesi ile askerleri için gerekli her tür besin kaynağını düzenli bir şekilde sağlamıştır

  8. Differences in health-related quality of life between Roma and non-Roma coronary heart disease patients : the role of hostility

    NARCIS (Netherlands)

    Silarova, Barbora; van Dijk, Jitse P.; Nagyova, Iveta; Rosenberger, Jaroslav; Reijneveld, Sijmen A.

    2014-01-01

    The aim of this study was to assess differences in health-related quality of life (HRQoL) between Roma and non-Roma coronary heart disease (CHD) patients, and whether differences in hostility contribute to this association. We examined 570 CHD patients (mean age 57.8, 28.1 % female) scheduled for co

  9. Differences in health-related quality of life between Roma and non-Roma coronary heart disease patients : the role of hostility

    NARCIS (Netherlands)

    Silarova, Barbora; van Dijk, Jitse P.; Nagyova, Iveta; Rosenberger, Jaroslav; Reijneveld, Sijmen A.

    The aim of this study was to assess differences in health-related quality of life (HRQoL) between Roma and non-Roma coronary heart disease (CHD) patients, and whether differences in hostility contribute to this association. We examined 570 CHD patients (mean age 57.8, 28.1 % female) scheduled for

  10. Birth-weight differences of Roma and non-Roma neonates--public health implications from a population-based study in Hungary.

    Science.gov (United States)

    Balázs, Péter; Rákóczi, Ildikó; Grenczer, Andrea; Foley, Kristie L

    2014-03-01

    This study analyses the role of ethnicity-based birth weight differences at term (37-42 weeks) between neonates of Roma and non-Roma populations in Hungary, controlling for socio-demographic and biological characteristics of the mothers. A cross-sectional survey among 9,040 mothers coupled with biometric data of the neonates was conducted in 2010. Inclusion criteria were: at term (37-42 weeks gestation) non-pathological pregnancies, and self-reported ethnicity. Birth weight was based on mothers' ethnicity, age, body mass index, education, marital and employment status, poverty level, household amenities, dietary and smoking habits using multiple linear regression. The mean difference between Roma and non-Roma neonates measured without controlling for possible confounding factors was -288.7 gram (p Roma neonates weighed on average 69.67 grams less than non-Roma neonates (p Roma ethnicity was independently correlated with lower birth-weight among at term neonates, controlling for known risk factors. Roma ethnicity may serve as a proxy for other unmeasured social or biological factors and should be considered an important covariate for measurement among neonates.

  11. Health Behaviors, Nutritional Status, and Anthropometric Parameters of Roma and Non-Roma Mothers and Their Infants in the Czech Republic

    Science.gov (United States)

    Rambouskova, Jolana; Dlouhy, Pavel; Krizova, Eva; Prochazka, Bohumir; Hrncirova, Dana; Andel, M

    2009-01-01

    Objective: To compare maternal health behaviors, maternal nutritional status, and infant size at birth of Romas and non-Romas in the Czech Republic. Design: Maternal interviews and food frequency questionnaire, maternal blood samples, physical measurements of mothers and infants. Setting: Hospital, maternal/child care center; 2-4 days postpartum.…

  12. Accessible health care for Roma: a gypsy's tale a qualitative in-depth study of access to health care for Roma in Ghent.

    Science.gov (United States)

    Hanssens, Lise G M; Devisch, Ignaas; Lobbestael, Janique; Cottenie, Barbara; Willems, Sara

    2016-02-29

    In general, vulnerable populations experience more problems in accessing health care. This also applies to the Roma-population. In the City of Ghent, Belgium, a relatively large group of Roma resides more or less permanently. The aim of this study is to explore the barriers this population encounters in their search for care. In this qualitative study using in-depth interviews the barriers to health care for the Roma in Ghent are explored. We interviewed 12 Roma and 13 professionals (volunteers, health care providers,...) who had regular contact with the Roma-population in Ghent. For both groups purposive sampling was used to achieve maximal variation regarding gender, age, nationality and legal status. The Roma-population in Ghent encounters various barriers in their search for care. Financial constraints, not being able to reach health care and having problems to get through the complexity of the system are some of the most critical problems. Another important finding is the crucial role of trust between patient and care provider in the care-giving process. Roma share several barriers with other minority groups, such as: financial constraints, mobility issues and not knowing the language. However, more distinctive for this group is the lack of trust in care providers and health care in general. As a result, restraint and lack of communication form serious barriers for both patient and provider in their interaction. In order to ensure equitable access for Roma, more emphasis should be on establishing a relationship of mutual respect and understanding.

  13. Health Behaviors, Nutritional Status, and Anthropometric Parameters of Roma and Non-Roma Mothers and Their Infants in the Czech Republic

    Science.gov (United States)

    Rambouskova, Jolana; Dlouhy, Pavel; Krizova, Eva; Prochazka, Bohumir; Hrncirova, Dana; Andel, M

    2009-01-01

    Objective: To compare maternal health behaviors, maternal nutritional status, and infant size at birth of Romas and non-Romas in the Czech Republic. Design: Maternal interviews and food frequency questionnaire, maternal blood samples, physical measurements of mothers and infants. Setting: Hospital, maternal/child care center; 2-4 days postpartum.…

  14. Delinquent and Aggressive Behavior and Social Desirability Among Roma and Non-Roma Adolescents in Slovakia: A Cross-Sectional Study.

    Science.gov (United States)

    Kolarcik, Peter; Madarasova Geckova, Andrea; Reijneveld, Sijmen A; van Dijk, Jitse P

    2016-02-01

    Rates of aggression and delinquency are assumed to be higher among Roma and other minorities, but sound evidence of this is lacking. Our aim was to assess delinquent and aggressive behavior among Roma and non-Roma adolescents and the effects on ethnic differences of parental education and social desirability. We conducted a cross-sectional study among Roma from separated and segregated settlements in the eastern part of Slovakia (N = 330; Mage = 14.50; interview) and non-Roma adolescents (N = 722; Mage = 14.86; questionnaire). The effect of ethnicity on antisocial behaviors was analyzed using linear regression (crude) and adjusted for gender, parental education, and social desirability. Adjustment for social desirability diminished the ethnic differences in delinquency (B = 1.08; 95% confidence interval [CI] = [2.12, -0.04]), led to an increase in the differences in hostility (B = 2.43; 95% CI = [0.87, 3.99]), and led to the disappearance of differences in physical aggression (B = 0.45; 95% CI = [1.14, 2.07]). Parental education did not affect the associations in an important way. Our findings indicate that Roma are not that much different from non-Roma, in terms of antisocial behavior, which contradicts the general perception of Roma. Our findings should be confirmed in other settings.

  15. The foreign exchange market: return distributions, multifractality, anomalous multifractality and the Epps effect

    Science.gov (United States)

    Drożdż, Stanisław; Kwapień, Jarosław; Oświȩcimka, Paweł; Rak, Rafał

    2010-10-01

    We present a systematic study of various statistical characteristics of high-frequency returns from the foreign exchange market. This study is based on six exchange rates forming two triangles: EUR-GBP-USD and GBP-CHF-JPY. It is shown that the exchange rate return fluctuations for all of the pairs considered are well described by the non-extensive statistics in terms of q-Gaussians. There exist some small quantitative variations in the non-extensivity q-parameter values for different exchange rates (which depend also on the time scales studied), and this can be related to the importance of a given exchange rate in the world's currency trade. Temporal correlations organize the series of returns such that they develop the multifractal characteristics for all of the exchange rates, with a varying degree of symmetry of the singularity spectrum f(α), however. The most symmetric spectrum is identified for the GBP/USD. We also form time series of triangular residual returns and find that the distributions of their fluctuations develop disproportionately heavier tails as compared to small fluctuations, which excludes description in terms of q-Gaussians. The multifractal characteristics of these residual returns reveal such anomalous properties as negative singularity exponents and even negative singularity spectra. Such anomalous multifractal measures have so far been considered in the literature in connection with diffusion-limited aggregation and with turbulence. Studying the cross-correlations among different exchange rates, we found that market inefficiency on short time scales leads to the occurrence of the Epps effect on much longer time scales, but comparable to the ones for the stock market. Although the currency market is much more liquid than the stock markets and has a much greater transaction frequency, the building up of correlations takes up to several hours—a duration that does not differ much from what is observed in the stock markets. This may suggest

  16. Multifraction separation in countercurrent chromatography (MCSGP).

    Science.gov (United States)

    Krättli, Martin; Müller-Späth, Thomas; Morbidelli, Massimo

    2013-09-01

    The multicolumn countercurrent solvent gradient purification (MCSGP) process is a continuous countercurrent multicolumn chromatography process capable of performing three fraction separations while applying a linear gradient of some modifier. This process can then be used either for the purification of a single species from a multicomponent mixture or to separate a three component mixture in one single operation. In this work, this process is extended to the separation of multifractions, in principle with no limitation. To achieve this goal the MCSGP standard process is extended by introducing one extra separation section per extra fraction to be isolated. Such an extra separation section is realized in this work through a single additional column, so that a n fraction MCSGP process can be realized using a minimum of n columns. Two separation processes were considered to experimentally demonstrate the possibility of realizing a four-fraction MCSGP unit able to purify two intermediate products in a given multicomponent mixture. The first one was a model mixture containing four different proteins. The two proteins eluting in the center of the chromatogram were purified with yields equal to 95% for the early eluting and 92% for the later eluting one. The corresponding purities were 94% and 97%, respectively. Such performance was well superior to that of the batch operation with the same modifier gradient which for the same purity values could not achieve yields larger than 67% and 81%, respectively. Similar performance improvements were found for the second separation where two out of seven charge variants which constitute the mAb Cetuximab currently available on the market have been purified in one single operation using a four-fraction MCSGP unit. In this case, yields of 81% and 65% were obtained with purities of 90% and 89%, respectively. These data compare well with the corresponding data from batch chromatography where with the same gradient and for the same

  17. Selection of Multifractal Scaling Breaks and Separation of Geochemical and Geophysical Anomaly

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Spatially superimposed multiple processes such as multiplicative cascade processes often generate multifractal measures possessing so-called self-similarity or self-affinity that can be described by power-law type of functions within certain scale ranges. The multifractalities can be estimated by applying multifractal modeling to the measures reflecting the characteristics of the physical processes such as the element concentration values analyzed in rock and soil samples and caused by the underlying mineralization processes and the other geological processes. The local and regional geological processes may result in geochemical patterns with distinct multifractalities as well as variable scaling ranges. Separation of these multifractal measures on the basis of both the distinct multifractalities and the scaling ranges will be significant for both theoretical studies of multifractal modeling and its applications. Multifractal scaling breaks have been observed from various multifractal patterns. This paper introduces a technique for separating multifractal measures on the basis of scaling breaks. It has been demonstrated that the method is effective for decomposing geochemical and geophysical anomalies required for mineral exploration. A dataset containing the element concentration values of potassium and phosphorus in soil samples was employed for demonstrating the application of the method for studying the fertilizer and yield optimization in agriculture.

  18. Influence of urban morphology on total noise pollution: multifractal description.

    Science.gov (United States)

    Ariza-Villaverde, Ana B; Jiménez-Hornero, Francisco J; Gutiérrez De Ravé, Eduardo

    2014-02-15

    Exposure to ambient noise levels above 65 dB can cause public health problems. The spatial distribution of this kind of pollution is linked to various elements which make up the urban form, such as construction density, the existence of open spaces and the shape and physical position of buildings. Since urban morphology displays multifractal behaviour, the present research studies for the first time the relationship between total noise pollution and urban features, such as street width and building height by means of a joint multifractal spectrum in two neighbourhoods of the city of Cordoba (Andalusia, Spain). According to the results, the joint multifractal spectrum reveals a positive correlation between the total noise pollution and the street width to building height ratio, this being more evident when urban morphology is regular. The information provided by the multifractal analysis completes the description obtained by using urban indexes and landscape metrics and might be useful for urban planning once the linkage between both frameworks has been done.

  19. Nonlinear dynamics of wind waves: multifractal phase/time effects

    Directory of Open Access Journals (Sweden)

    R. H. Mellen

    1994-01-01

    Full Text Available In addition to the bispectral coherence method, phase/time analysis of analytic signals is another promising avenue for the investigation of phase effects in wind waves. Frequency spectra of phase fluctuations obtained from both sea and laboratory experiments follow an F-β power law over several decades, suggesting that a fractal description is appropriate. However, many similar natural phenomena have been shown to be multifractal. Universal multifractals are quantified by two additional parameters: the Lévy index 0 α 2 for the type of multifractal and the co-dimension 0 C1 1 for intermittence. The three parameters are a full statistical measure the nonlinear dynamics. Analysis of laboratory flume data is reported here and the results indicate that the phase fluctuations are 'hard multifractal' (α > 1. The actual estimate is close to the limiting value α = 2,  which is consistent with Kolmogorov's lognormal model for turbulent fluctuations. Implications for radar and sonar backscattering from the sea surface are briefly considered.

  20. A NOTE ON MULTIFRACTAL PACKING DIMENSION OF MEASURES

    Institute of Scientific and Technical Information of China (English)

    Jinjun Li

    2009-01-01

    The relations between the multifractal packing dimension of Borel probability measures and the asymptotic behavior of the function φ*(x)=lim sup/r→0 logv(V(x, r))-qlogμ(B(x, r))/logr are discussed and some applications are given.

  1. Multifractal Analysis of Local Entropies for Gibbs Measures

    NARCIS (Netherlands)

    Takens, Floris; Verbitski, Evgeni

    1998-01-01

    Recently a complete multifractal analysis of local dimensions, entropies and Lyapunov exponents of conformal expanding maps and surface Axion A diffeomorphisms for Gibbs measures was performed. The main goal of this was primarily the analysis of the local (pointwise) dimensions. This is an extremely

  2. Multifractal analysis of weighted networks by a modified sandbox algorithm

    Science.gov (United States)

    Song, Yu-Qin; Liu, Jin-Long; Yu, Zu-Guo; Li, Bao-Gen

    2015-12-01

    Complex networks have attracted growing attention in many fields. As a generalization of fractal analysis, multifractal analysis (MFA) is a useful way to systematically describe the spatial heterogeneity of both theoretical and experimental fractal patterns. Some algorithms for MFA of unweighted complex networks have been proposed in the past a few years, including the sandbox (SB) algorithm recently employed by our group. In this paper, a modified SB algorithm (we call it SBw algorithm) is proposed for MFA of weighted networks. First, we use the SBw algorithm to study the multifractal property of two families of weighted fractal networks (WFNs): “Sierpinski” WFNs and “Cantor dust” WFNs. We also discuss how the fractal dimension and generalized fractal dimensions change with the edge-weights of the WFN. From the comparison between the theoretical and numerical fractal dimensions of these networks, we can find that the proposed SBw algorithm is efficient and feasible for MFA of weighted networks. Then, we apply the SBw algorithm to study multifractal properties of some real weighted networks — collaboration networks. It is found that the multifractality exists in these weighted networks, and is affected by their edge-weights.

  3. Multifractal and mechanical analysis of amorphous solid dispersions.

    Science.gov (United States)

    Adler, Camille; Teleki, Alexandra; Kuentz, Martin

    2017-03-09

    The formulation of lipophilic and hydrophobic compounds is a challenge for the pharmaceutical industry and it requires the development of complex formulations. Our first aim was to investigate hot-melt extrudate microstructures by means of multifractal analysis using scanning electron microscopy imaging. Since the microstructure can affect solid dosage form performance such as mechanical properties, a second objective was to study the influence of the type of adsorbent and of the presence of an amorphous compound on extrudate hardness. β-Carotene (BC) was chosen as poorly water-soluble model compound. Formulations containing a polymer, a lipid and two different silica based inorganic carriers were produced by hot-melt extrusion. Based on scanning electron microscopy/energy dispersive X-ray spectroscopy, the obtained images were analyzed using multifractal formalism. The breaking force of the strands was assessed by a three point bending test. Multifractal analysis and three point bending results showed that the nature of interparticle interactions in the inorganic carrier as well as the presence of amorphous BC had an influence on the microstructure and thus on the mechanical performance. The use of multifractal analysis and the study of the mechanical properties were complementary to better characterize and understand complex formulations obtained by hot-melt extrusion.

  4. MULTIFRACTAL STRUCTURES DETECTED BY VOYAGER 1 AT THE HELIOSPHERIC BOUNDARIES

    Energy Technology Data Exchange (ETDEWEB)

    Macek, W. M. [Faculty of Mathematics and Natural Sciences, Cardinal Stefan Wyszyński University, Wóycickiego 1/3, 01-938 Warsaw (Poland); Wawrzaszek, A. [Space Research Centre, Polish Academy of Sciences, Bartycka 18 A, 00-716 Warszawa (Poland); Burlaga, L. F., E-mail: macek@cbk.waw.pl, E-mail: anna.wawrzaszek@cbk.waw.pl, E-mail: lburlagahsp@verizon.net [NASA Goddard Space Flight Center, Code 673, Greenbelt, MD 20771 (United States)

    2014-10-01

    To better understand the dynamics of turbulent systems, we have proposed a phenomenological model based on a generalized Cantor set with two rescaling and one weight parameters. In this Letter, using recent Voyager 1 magnetic field data, we extend our two-scale multifractal analysis further in the heliosheath beyond the heliospheric termination shock, and even now near the heliopause, when entering the interstellar medium for the first time in human history. We have identified the scaling inertial region for magnetized heliospheric plasma between the termination shock and the heliopause. We also show that the degree of multifractality decreases with the heliocentric distance and is still modulated by the phases of the solar cycle in the entire heliosphere including the heliosheath. Moreover, we observe the change of scaling toward a nonintermittent (nonmultifractal) behavior in the nearby interstellar medium, just beyond the heliopause. We argue that this loss of multifractal behavior could be a signature of the expected crossing of the heliopause by Voyager 2 in the near future. The results obtained demonstrate that our phenomenological multifractal model exhibits some properties of intermittent turbulence in the solar system plasmas, and we hope that it could shed light on universal characteristics of turbulence.

  5. H.264/AVC Video Compressed Traces: Multifractal and Fractal Analysis

    Directory of Open Access Journals (Sweden)

    Samčović Andreja

    2006-01-01

    Full Text Available Publicly available long video traces encoded according to H.264/AVC were analyzed from the fractal and multifractal points of view. It was shown that such video traces, as compressed videos (H.261, H.263, and MPEG-4 Version 2 exhibit inherent long-range dependency, that is, fractal, property. Moreover they have high bit rate variability, particularly at higher compression ratios. Such signals may be better characterized by multifractal (MF analysis, since this approach describes both local and global features of the process. From multifractal spectra of the frame size video traces it was shown that higher compression ratio produces broader and less regular MF spectra, indicating to higher MF nature and the existence of additive components in video traces. Considering individual frames (I, P, and B and their MF spectra one can approve additive nature of compressed video and the particular influence of these frames to a whole MF spectrum. Since compressed video occupies a main part of transmission bandwidth, results obtained from MF analysis of compressed video may contribute to more accurate modeling of modern teletraffic. Moreover, by appropriate choice of the method for estimating MF quantities, an inverse MF analysis is possible, that means, from a once derived MF spectrum of observed signal it is possible to recognize and extract parts of the signal which are characterized by particular values of multifractal parameters. Intensive simulations and results obtained confirm the applicability and efficiency of MF analysis of compressed video.

  6. Multifractal Decomposition of Statistically Self-Similar Sets

    Institute of Scientific and Technical Information of China (English)

    Jing Hu YU; Di He HU

    2001-01-01

    Let K be a statistically self-similar set defined by Graf. In this paper, we construct arandom measure p which is supported by K and study the multifractal decomposition for K with p.Under such a decomposition, we obtain the expression of the spectrum function f(α).

  7. Variability of multifractal parameters in an urban precipitation monitoring network

    Science.gov (United States)

    Licznar, Paweł; De Michele, Carlo; Dżugaj, Dagmara; Niesobska, Maria

    2014-05-01

    Precipitation especially over urban areas is considered a highly non-linear process, with wide variability over a broad range of temporal and spatial scales. Despite obvious limitations of rainfall gauges location at urban sites, rainfall monitoring by gauge networks is a standard solution of urban hydrology. Often urban precipitation gauge networks are formed by modern electronic gauges and connected to control units of centralized urban drainage systems. Precipitation data, recorded online through these gauge networks, are used in so called Real-Time-Control (RTC) systems for the development of optimal strategies of urban drainage outflows management. As a matter of fact, the operation of RTC systems is motivated mainly by the urge of reducing the severity of urban floods and combined sewerage overflows, but at the same time, it creates new valuable precipitation data sources. The variability of precipitation process could be achieved by investigating multifractal behavior displayed by the temporal structure of precipitation data. There are multiply scientific communications concerning multifractal properties of point-rainfall data from different worldwide locations. However, very little is known about the close variability of multifractal parameters among closely located gauges, at the distances of single kilometers. Having this in mind, here we assess the variability of multifractal parameters among gauges of the urban precipitation monitoring network in Warsaw, Poland. We base our analysis on the set of 1-minute rainfall time series recorded in the period 2008-2011 by 25 electronic weighing type gauges deployed around the city by the Municipal Water Supply and Sewerage Company in Warsaw as a part of local RTC system. The presence of scale invariance and multifractal properties in the precipitation process was investigated with spectral analysis, functional box counting method and studying the probability distributions and statistical moments of the rainfall

  8. International Action to Prevent Discrimination: The Situation of the Roma Community in the Field of Education

    OpenAIRE

    Judtih Gimenez

    2010-01-01

    This article discusses why recent discriminatory incidents against the Roma community, one of the biggest minorities in Europe, rise in racism and anti-Roma hate speech in public discourse concerns international organizations. The first part of this article briefly outlines human rights bodies’ definition and regulation on the principle of equality and non-discrimination generally and in particular with regard to Roma education. The second part compares recent international human rights’ conc...

  9. Is the cardiovascular risk profile of people living in Roma settlements worse in comparison with the majority population in Slovakia?

    Science.gov (United States)

    Babinska, Ingrid; Veselska, Zuzana Dankulincova; Bobakova, Daniela; Pella, Daniel; Panico, Salvatore; Reijneveld, Sijmen A; Jarcuska, Peter; Jarcuska, Pavol; Zezula, Ivan; Geckova, Andrea Madarasova

    2013-06-01

    Roma constitute a large minority in several Central European countries, with a mostly disadvantaged societal and health position. The aim of this study was to assess biological and other cardiovascular diseases (CVD) risk factors in people living in Roma settlements and to compare them with non-Roma. We used data from the cross-sectional Hepa-Meta study conducted in Slovakia. The sample consisted of 452 Roma (mean age = 34.7, 35.2 % men) and 403 non-Roma (mean age = 33.5, 45.9 % men). The effect of ethnicity was analysed using logistic regression adjusted for age and stratified by gender. Roma were more likely to have obesity, low HDL cholesterol, normal total cholesterol, and to smoke than non-Roma. Moreover, Roma women were more likely to have abdominal obesity and Roma men to have normal LDL cholesterol than non-Roma. No significant differences by ethnicity were found regarding hypertriglyceridaemia, hyperglycaemia and hypertension. Our study confirmed higher rates of some CVD risk factors in Roma compared with non-Roma. Our findings call for interventions aiming at decreasing CVD risks and improving health literacy among Roma, to reduce CVD morbidity and premature mortality.

  10. Assessing microstructures of pyrrhotites in basalts by multifractal analysis

    Directory of Open Access Journals (Sweden)

    S. Xie

    2010-07-01

    Full Text Available Understanding and describing spatial arrangements of mineral particles and determining the mineral distribution structure are important to model the rock-forming process. Geometric properties of individual mineral particles can be estimated from thin sections, and different models have been proposed to quantify the spatial complexity of mineral arrangement. The Gejiu tin-polymetallic ore-forming district, located in Yunnan province, southwestern China, is chosen as the study area. The aim of this paper is to apply fractal and multifractal analysis to quantify distribution patterns of pyrrhotite particles from twenty-eight binary images obtained from seven basalt segments and then to discern the possible petrological formation environments of the basalts based on concentrations of trace elements. The areas and perimeters of pyrrhotite particles were measured for each image. Perimeter-area fractal analysis shows that the perimeter and area of pyrrhotite particles follow a power-law relationship, which implies the scale-invariance of the shapes of the pyrrhotites. Furthermore, the spatial variation of the pyrrhotite particles in space was characterized by multifractal analysis using the method of moments. The results show that the average values of the area-perimeter exponent (DAP, the width of the multifractal spectra (Δ(D(0−D(2 and Δ(D(qminD(qmax and the multifractality index (τ"(1 for the pyrrhotite particles reach their minimum in the second basalt segment, which implies that the spatial arrangement of pyrrhotite particles in Segment 2 is less heterogeneous. Geochemical trace element analysis results distinguish the second basalt segment sample from other basalt samples. In this aspect, the fractal and multifractal analysis may provide new insights into the quantitative assessment of mineral microstructures which may be closely associated with the petrogenesis as shown by the

  11. Primary care for the Roma in Europe: Position paper of the European forum for primary care

    Science.gov (United States)

    Rotar Pavlič, Danica; Zelko, Erika; Vintges, Marga; Willems, Sara; Hanssens, Lise

    2016-01-01

    Abstract Roma populations’ low health status and limited access to health services, including primary care, has been documented in many European countries, and warrants specific health policies and practices. A variety of experiences shows how primary care can adjust its practices to reduce the barriers to primary care for Roma populations. At local level, establishing collaboration with Roma organisations helps primary care to improve mutual relations and quality of care. Mediation has proved to be an effective tool. Skills training of primary care practitioners may enhance their individual competences. Research and international sharing of experiences are further tools to improve primary care for the Roma people. PMID:27703542

  12. The Survival of Roma Minority Patients on Chronic Hemodialysis Therapy - A Romanian Multicenter Survey.

    Science.gov (United States)

    Gadalean, Florica; Lighezan, Daniel; Stoian, Dana; Schiller, Oana; Timar, Romulus; Timar, Bogdan; Bob, Flaviu; Donciu, Mihaela Dora; Munteanu, Mircea; Mihaescu, Adelina; Covic, Adrian; Schiller, Adalbert

    2016-01-01

    The Roma minority represents the largest ethnic group in Central and South-East European countries. Data regarding the mortality in Roma hemodialysis subjects are limited. We evaluated the 3 year mortality of ESRD Roma patients treated with hemodialysis (HD). Our prospective cohort study included 600 ESRD patients on HD therapy recruited from 7 HD centers, from the main geographical regions of Romania. The median age of the patients was 56 (19) years, 332 (55.3%) being males, 51 (8.5%) having Roma ethnicity. Roma ESRD patients initiate dialysis at a younger age, 47.8 years vs. 52.3 years (P = 0.017), present higher serum albumin (P = 0.013) and higher serum phosphate levels (P = 0.021). In the Roma group, the overall 3 year mortality was higher when compared to Caucasians (33.3% vs. 24.8%). The multivariate survival analysis revealed that being of Roma ethnicity is an independent risk factor for mortality (HR = 1.74; 95% CI = 1.04-2.91; P = 0.035). Roma patients with ESRD initiate HD therapy at a younger age as compared to Caucasians. They have a higher 3 year mortality rate and are dying at a younger age. Roma ethnicity represents an independent risk factor for mortality in our cohort.

  13. Challenges in sexual and reproductive health of Roma people who live in settlements in Serbia.

    Science.gov (United States)

    Sedlecky, Katarina; Rašević, Mirjana

    2015-04-01

    To investigate the differences in sexual and reproductive health (SRH) between Roma women of reproductive age who live in settlements and the general population of women of the same age in Serbia who do not live in settlements. The Multiple Indicator Cluster Survey 4 (MICS4) was administered to Roma and Serbian women and the results were compared between the two groups. In order to get a qualitative perspective, a specifically designed, short open-ended questionnaire about Roma women was given to Roma Health Mediators (RHMs). Roma women have a higher total fertility rate and adolescent birth rate, and early marriage is much more common among them. Differences are less clear regarding antenatal care and assistance during delivery from skilled personnel. Roma women more frequently rely on traditional contraception, and are less likely to use modern contraceptives than the general female population. Problems in the socio-economic sphere, poor school enrolment and maintenance of traditional patterns in Roma people living in settlements contribute to the disparities observed. Although data on the SRH of the general population of women in Serbia are far from being satisfactory, those for women who live in Roma settlements are much worse. Political actions aimed at the empowerment of Roma women in the spheres of education, employment and health promotion have been implemented with the hope that they might improve the SRH of this vulnerable population group.

  14. Mixed Multifractal Analysis of Crude Oil, Gold and Exchange Rate Series

    Science.gov (United States)

    Dai, Meifeng; Shao, Shuxiang; Gao, Jianyu; Sun, Yu; Su, Weiyi

    2016-11-01

    The multifractal analysis of one time series, e.g. crude oil, gold and exchange rate series, is often referred. In this paper, we apply the classical multifractal and mixed multifractal spectrum to study multifractal properties of crude oil, gold and exchange rate series and their inner relationships. The obtained results show that in general, the fractal dimension of gold and crude oil is larger than that of exchange rate (RMB against the US dollar), reflecting a fact that the price series in gold and crude oil are more heterogeneous. Their mixed multifractal spectra have a drift and the plot is not symmetric, so there is a low level of mixed multifractal between each pair of crude oil, gold and exchange rate series.

  15. Geovisualización del turismo urbano. Roma

    Directory of Open Access Journals (Sweden)

    Fabien Girardin

    2015-03-01

    Este trabajo, presenta la oportunidad emergente que supone el uso y práctica de geo-visualizaciones que permiten revelar el "pulso de una ciudad" con la visualización de los datos espacio-temporales generados gracias a la interacción de las personas con el entorno urbano, para lo cual se georreferencian algunos fenómenos en la ciudad de Roma.

  16. Neuropsicologia, le novità dal congresso Sinp di Roma

    OpenAIRE

    2012-01-01

    Tutte le novità su mente e cervello dal congresso annuale della Società Italiana di Neuropsicologia (Sinp 2012) tenutosi lo scorso Novembre presso la Fondazione Santa Lucia di Roma presentate su BrainFactor in uno "speciale" realizzato dagli studenti del Laboratorio di Comunicazione giornalistica dell'Università degli Studi di Milano Bicocca. Memoria, percezione, linguaggio, semantica, afasie, sclerosi multipla, disordini di coscienza, stato vegetativo, stato di minima coscienza, Alzheimer, d...

  17. Application of Markov Model in Forecasting the Distribution of Rank Order for Death Causes%Markov模型在死因顺位分布转移预测中的应用

    Institute of Scientific and Technical Information of China (English)

    陈翔; 李丽星; 洪嘉铭; 周怡

    2014-01-01

    目的以肇庆市第一人民医院2003~2006年住院病例死因顺位转移情况为依据,预测2007~2012年该院住院病例死因顺位分布转移情况,探讨2005年实施《全国高血压社区规范化管理》项目以来肇庆地区高血压防治取得的效果。方法应用Markov状态转移矩阵预测高血压病防控对死因顺位分布的影响。结果Markov模型预测该院住院患者死因顺位分布转移与实际情况吻合较好,前三位主要死因分别从2003~2004年的肿瘤、神经系统和循环系统疾病,变为2005年开始的肿瘤、循环系统和神经系统疾病,神经系统脑意外死亡减少,到2012年且各病种的住院病例平均死亡年龄增长了4.1岁。结论从该院十年来死因顺位变化看,实施《全国高血压社区规范化管理》在广东肇庆地区可能有较为明显的效果,Markov模型用于预测各种疾病状态转移趋势显示出较好的优势。%Objective To forecast the distribution of hospital rank order for death causes from 2007 to 2012, which is based on the transition condition of death cause from 2003 to 2006 in the first People’s hospital of Zhaoqing city; investigate the effect of hypertension preventing and controlling in Zhaoqing district since 2005 to implement the standardized management of hypertension based on community. Methods Using Markov state transition matrix to forecast the influence of hypertension preventing and controlling for rank order for death causes distribution. Results The condition of distribution and transition of rank order for death causes with Markov model forecasting was in good accordance with the true condition. The first three causes of death were tumor, nervous system disease and circulatory disease from 2003 to 2004; then there were tumor, circulatory disease and nervous system disease since 2005. The average death age of each disease increased 4.1 years old until 2012. Conclusion An observation at the

  18. Stochastic formalism-based seafloor feature discrimination using multifractality of time-dependent acoustic backscatter

    Digital Repository Service at National Institute of Oceanography (India)

    Haris, K.; Chakraborty, B.

    location (Fig. 1b). Depth-dependent correction Apart from the processing steps described in the preceding subsection, the echo-envelope data require an additional cor- rection for the sonar footprint dimension prior to stochas- tic multifractal analyses... ensemble averaged to obtain a representative stable acous- tic signal (at each location) prior to multifractal analyses. be multifractal over various ranges (Lovejoy and Schertzer, 2007a). However, in the specific case of echo envelopes, the power...

  19. Using Participatory, Visual and Biographical Methods with Roma Youth

    Directory of Open Access Journals (Sweden)

    Oana Marcu

    2015-11-01

    Full Text Available The article deals with drug use by young Roma as members of a marginalized population. It reflects on the use of collages and of metaphor analysis on images produced by participants within an action-research approach. Additionally, various stakeholders were involved in a participatory manner in defining research questions, priorities and strategies. In order to understand young Roma's perceptions on drugs, 23 visual focus groups and 58 life-story interviews were conducted in five European countries. In the focus groups, young people built collages to represent drugs and then explained their meanings. Metaphor analysis was used to analyze the data. With the biographical interviews, histories of consumption from drug users were gathered. Among the trends identified are the early onset of tobacco use, exposure to consumption of alcohol by adults, underestimation of the consequences of many drugs, addiction to injecting drug use in specific areas. Gender roles are strongly associated with patterns of consumption. Roma young people also express belonging and reclaim positive social status by using certain types of drugs and by sharing consumption patterns with non-minority young people. The research process also illustrates how qualitative research can contribute to selective prevention programs. URN: http://nbn-resolving.de/urn:nbn:de:0114-fqs160155

  20. Efficient nonrigid registration using ranked order statistics

    DEFF Research Database (Denmark)

    Tennakoon, Ruwan B.; Bab-Hadiashar, Alireza; de Bruijne, Marleen

    2013-01-01

    Non-rigid image registration techniques are widely used in medical imaging applications. Due to high computational complexities of these techniques, finding appropriate registration method to both reduce the computation burden and increase the registration accuracy has become an intense area...... of research. In this paper we propose a fast and accurate non-rigid registration method for intra-modality volumetric images. Our approach exploits the information provided by an order statistics based segmentation method, to find the important regions for registration and use an appropriate sampling scheme...... to target those areas and reduce the registration computation time. A unique advantage of the proposed method is its ability to identify the point of diminishing returns and stop the registration process. Our experiments on registration of real lung CT images, with expert annotated landmarks, show...

  1. Rank order scaling of pictorial depth

    NARCIS (Netherlands)

    Van Doorn, A.; Koenderink, J.; Wagemans, J.

    2011-01-01

    We address the topic of “pictorial depth” in cases of pictures that are unlike photographic renderings. The most basic measure of “depth” is no doubt that of depth order. We establish depth order through the pairwise depth-comparison method, involving all pairs from a set of 49 fiducial points. The

  2. Nutritional status and growth parameters of school-age Roma children in the Republic of Macedonia.

    Science.gov (United States)

    Spiroski, Igor; Dimitrovska, Zlatanka; Gjorgjev, Dragan; Mikik, Vladimir; Efremova-Stefanoska, Vesna; Naunova-Spiroska, Daniela; Kendrovski, Vladimir

    2011-06-01

    Main objective of the study was to assess the nutritional status of school age Roma children in Macedonia in order to detect precursors of possible health risks at an early age. The study was designed as a comparative case control study. Study group consisted of 229 Roma school children from the 1st and 272 from the 5th grade residing in different towns in Macedonia. The control group was recruited from other than Roma ethnic background and consisted of 283 children attending 1st and 356 children attending 5th grade. Every participant was measured for his/hers body height and weight. The t-test and Chi square (Chi2) were applied to test statistical significance of variables. The WHO's AnthroPlus software was applied to assess growth parameters and population at risk. There were significant differences in values of the body weight (p = 0.001) and height (p = 0.001) between Roma and non-Roma children attending the 1st grade of primary school. Weight-for-age, height-for-age and BMI-for-age indexes of the 1st grade children significantly differred in in the same intervals of SD (> or = -2SD and or = -1SD and median; > +1SD and Roma and non-Roma 5th graders. Anthropometric parameters of nutritional status of Roma children in Macedonia are significantly different than those of their non-Roma peers. Their health risks are predominantly related to underweight. The parameters related to health risks of overweight or obesity are lower in Roma than in non-Roma children.

  3. Multifractal Detrended Fluctuation Analysis of Interevent Time Series in a Modified OFC Model

    Institute of Scientific and Technical Information of China (English)

    LIN Min; YAN Shuang-Xi; ZHAO Gang; WANG Gang

    2013-01-01

    We use multifractal detrended fluctuation analysis (MF-DFA) method to investigate the multifractal behavior of the interevent time series in a modified Olami-Feder-Christensen (OFC) earthquake model on assortative scale-free networks.We determine generalized Hurst exponent and singularity spectrum and find that these fluctuations have multifractal nature.Comparing the MF-DFA results for the original interevent time series with those for shuffled and surrogate series,we conclude that the origin of multifractality is due to both the broadness of probability density function and long-range correlation.

  4. An Airborne Radar Clutter Tracking Algorithm Based on Multifractal and Fuzzy C-Mean Cluster

    Institute of Scientific and Technical Information of China (English)

    Wei Zhang; Sheng-Lin Yu; Gong Zhang

    2007-01-01

    For an airborne lookdown radar, clutter power often changes dynamically about 80 dB with wide distributions as the platform moves. Therefore, clutter tracking techniques are required to guide the selection of const false alarm rate (CFAR) schemes. In this work, clutter tracking is done in image domain and an algorithm combining multifractal and fuzzy C-mean (FCM) cluster is proposed. The clutter with large dynamic distributions in power density is converted to steady distributions of multifractal exponents by the multifractal transformation with the optimum moment. Then, later, the main lobe and side lobe are tracked from the multifractal exponents by FCM clustering method.

  5. Turbulence in magnetized plasmas and financial markets: comparative study of multifractal statistics

    Science.gov (United States)

    Budaev, V. P.

    2004-12-01

    The turbulence in magnetized plasma and financial data of Russian market have been studied in terms of the multifractal formalism revisited with wavelets. The multifractal formalism based on wavelet calculations allows one to study the scaling properties of turbulent fluctuations. It is observed that both plasma edge turbulence in fusion devices and Russian financial markets demonstrate multifractal statistics, i.e., the scaling behaviour of absolute moments is described by a convex function. Multifractality parameter defined in multiplicative cacade model, seems to be of the same magnitude for the plasma and financial time series considered in this paper.

  6. Multifractal properties of ECG patterns of patients suffering from congestive heart failure

    Science.gov (United States)

    Dutta, Srimonti

    2010-12-01

    The multifractal properties of two-channel ECG patterns of patients suffering from severe congestive heart failure (New York Heart Association (NYHA) classes III-IV) are studied and are compared with those for normal healthy people using the multifractal detrended fluctuation analysis methodology. Ivanov et al (1999 Nature 399 461) have studied the multifractality of human heart rate dynamics using the wavelet transformation modulus maxima (WTMM) methodology. But it has been observed by several scientists that multifractal detrended fluctuation analysis (MFDFA) works better than the WTMM method in the detection of monofractal and multifractal characteristics of the data. Galaska et al (2008 Ann. Noninvasive Electrocardiol. 13 155) have observed that MFDFA is more sensitive compared to the WTMM method in the differentiation between multifractal properties of the heart rate in healthy subjects and patients with left ventricular systolic dysfunction. In the present work the variation of two parameters of the multifractal spectrum—its width W (related to the degree of multifractality) and the value of the Hölder exponent α0—for the healthy and congestive heart failure patients is studied. α0 is a measure of the degree of correlation. The degree of multifractality varies appreciably (85-90% C.L.) for the normal and the CHF sets for channel I. For channel II no significant change in the values is observed. The degree of correlation is found to be comparatively high for the normal healthy people compared to those suffering from CHF.

  7. On multifractality of high-latitude geomagnetic fluctuations

    Directory of Open Access Journals (Sweden)

    Z. Vörös

    Full Text Available In order to contribute to the understanding of solar wind-magnetosphere interactions the multifractal scaling properties of high-latitude geomagnetic fluctuations observed at the Thule observatory have been studied. Using the local observatory data and the present experimental knowledge only it seems hard to characterize directly the, presumably intermittent, mesoscale energy accumulation and dissipation processes taking place at the magnetotail, auroral region, etc. Instead a positive probability measure, describing the accumulated local geomagnetic signal energy content at the given time scales has been introduced and its scaling properties have been studied. There is evidence for the multifractal nature of the so defined intermittent field ε, a result obtained by using the recently introduced technique of large deviation multifractal spectra. This technique allows us to describe the geomagnetic fluctuations locally in time by means of singularity exponents α, which represent a generalization of the local degree of differentiability and characterize the power-law scaling dependence of the introduced measure on resolution. A global description of the geomagnetic fluctuations is insured by the spectrum of exponents f(α which represents a rate function quantifying the deviations of the observed singularities α from the expected value. The results show that there exists a multifractal counterpart of the previously reported spectral break and different types of f(α spectra describe the fluctuations in direct dissipation or loading-unloading regimes of the solar wind-magnetosphere interaction. On the time scale of substorms and storms the multi-fractal structure of the loading-unloading mode fluctuations seems to be analogous to the simple multiplicative P-model, while the f(α spectra in direct dissipation regime are close but not equal to the features of a uniform distribution. Larger deviations from the multiplicative

  8. Psychosocial factors of coronary heart disease and quality of life among Roma coronary patients : a study matched by socioeconomic position

    NARCIS (Netherlands)

    Skodova, Zuzana; van Dijk, Jitse P.; Nagyova, Iveta; Rosenberger, Jaroslav; Ondusova, Daniela; Studencan, Martin; Reijneveld, Sijmen A.

    2010-01-01

    The aim of this study was to assess whether psychosocial factors and health-related quality of life (HRQL) differ between Roma and non-Roma coronary patients and to what degree socioeconomic status (SES) explains these differences. We included 138 patients out of 437 interviewed: 46 Roma, all with l

  9. Inclusion, Integration or Perpetual Exclusion? A Critical Examination of the Decade of Roma Inclusion, 2005-2015

    Science.gov (United States)

    Curcic, Svjetlana; Miskovic, Maja; Plaut, Shayna; Ceobanu, Ciprian

    2014-01-01

    A total of 12 European countries with significant Roma populations are taking part in the Decade of Roma Inclusion, 2005-2015 (the Decade). Each of these countries developed a Decade Action Plan with the aim of eliminating the marginalization and discrimination of Roma in the areas of housing, health care, employment and education. Nonetheless, as…

  10. Is the cardiovascular risk profile of people living in Roma settlements worse in comparison with the majority population in Slovakia?

    NARCIS (Netherlands)

    Babinska, Ingrid; Veselska, Zuzana Dankulincova; Bobakova, Daniela; Pella, Daniel; Panico, Salvatore; Reijneveld, Sijmen A.; Jarcuska, Peter; Jarcuska, Pavol; Zezula, Ivan; Geckova, Andrea Madarasova

    2013-01-01

    Roma constitute a large minority in several Central European countries, with a mostly disadvantaged societal and health position. The aim of this study was to assess biological and other cardiovascular diseases (CVD) risk factors in people living in Roma settlements and to compare them with non-Roma

  11. Inclusion, Integration or Perpetual Exclusion? A Critical Examination of the Decade of Roma Inclusion, 2005-2015

    Science.gov (United States)

    Curcic, Svjetlana; Miskovic, Maja; Plaut, Shayna; Ceobanu, Ciprian

    2014-01-01

    A total of 12 European countries with significant Roma populations are taking part in the Decade of Roma Inclusion, 2005-2015 (the Decade). Each of these countries developed a Decade Action Plan with the aim of eliminating the marginalization and discrimination of Roma in the areas of housing, health care, employment and education. Nonetheless, as…

  12. Poverty and Ethnicity: A Cross-Country Study of Roma Poverty in Central Europe. World Bank Technical Paper.

    Science.gov (United States)

    Revenga, Ana; Ringold, Dena; Tracy, William Martin

    Roma, or "gypsies," are the main poverty risk group in many countries of central and eastern Europe. Living standards for the Roma have deteriorated more severely during the region's transition to a market economy than they have for other population groups, and Roma have been poorly positioned to take advantage of emerging economic and…

  13. Exploring the social relations of Roma employability: The case of rural segregated communities in Romania

    Directory of Open Access Journals (Sweden)

    Loreni Elena Baciu

    2016-04-01

    Full Text Available The article reports on a qualitative study of Roma employability in Romania. Being the largest ethnic minority group in Europe, the Roma population is the object of profound marginalization in most of the countries where they reside, by measures such as spatial segregation and exclusion from the formal labour market. This article focuses particularly on the Roma living in rural segregated communities. Inspired by institutional ethnography, the aim is to explore the social organization of rural Roma employability from the standpoint of the Roma themselves. The main obstacles to employment, as they are known and shared by our interviewees, are a lack of available jobs within reach, their own lack of education and a rejection by employers on the grounds of them being Roma. As the analyses show, these obstacles, and the individual’s experiences and knowledge about them, are shaped and maintained by extended translocal relations of administration and governance, thus making the rural Roma dependent on a precarious secondary labour market of low-paid day work for neighbouring farmers. The uncertainty of this work, and the organization and work of everyday life it implies for the people inhabiting these communities, further increases the distance to formal employment. It is this complex set of relations coordinating people’s doings that produce the employability of Roma inhabiting the rural segregated communities.

  14. International Action to Prevent Discrimination: The Situation of the Roma Community in the Field of Education

    Directory of Open Access Journals (Sweden)

    Judtih Gimenez

    2010-12-01

    Full Text Available This article discusses why recent discriminatory incidents against the Roma community, one of the biggest minorities in Europe, rise in racism and anti-Roma hate speech in public discourse concerns international organizations. The first part of this article briefly outlines human rights bodies’ definition and regulation on the principle of equality and non-discrimination generally and in particular with regard to Roma education. The second part compares recent international human rights’ conclusions on Croatia, the Czech Republic, the Former Yugoslav Republic of Macedonia, and Slovakia with regard to the human rights developments of the Roma minority, and to the implementation of their national anti-discrimination legislation. In addition, the latter traces the debate on the access of Roma children to education in those countries, as well as reviews the European Court of Human Rights' case law, in particular with regard to two cases of Roma segregated education in Croatia and the Czech Republic. Finally, some conclusions are drawn as to how overcome the vicious circle of poverty and discrimination faced by the Roma population, in particular in the field of Roma education.

  15. A Minority within a Minority? Social Justice for Traveller and Roma Children in ECEC

    Science.gov (United States)

    Murray, Colette

    2012-01-01

    This article discusses recent policy developments in Europe regarding Roma and Traveller integration and Early Childhood Provision. After a long history of oppression, Roma issues have recently become prominent on the EU policy agenda. The article discusses how these relate to developments in other areas of policy: the European children's rights…

  16. How to Move from Power-Based to Dialogic Relations? Lessons from Roma Women

    Science.gov (United States)

    Melgar, Patricia; Larena, Rosa; Ruiz, Laura; Rammel, Stephanie

    2011-01-01

    In its growth strategy for the coming decade, the EU recognises the Roma as one of several groups especially affected by poverty and social vulnerability. So far, many efforts to reverse this social exclusion have failed; imposed solutions based on power relations have ignored Roma voices and suggestions from the community. As a result, the EU now…

  17. Democratic Governance for Inclusion: A Case Study of a Greek Primary School Welcoming Roma Pupils

    Science.gov (United States)

    Noula, Ioanna; Cowan, Steven; Govaris, Christos

    2015-01-01

    The focus of this paper is how changes in school governance in one state primary school in a city in central Greece have resulted in a significant degree of inclusion for Roma children. This inclusivity runs counter to the disturbing occurrence of the social and ethnic segregation of a group of locally resident Roma children within schools. This…

  18. Roma Pupils' Identification with School in Slovenia and Serbia: Case Studies

    Science.gov (United States)

    Macura-Milovanovic, Suncica; Munda, Milanka; Pecek, Mojca

    2013-01-01

    The research presented in this paper aims to challenge the belief held by some education professionals that Roma pupils do not value education. The research sample included groups of Roma pupils from two countries (Slovenia and Serbia) and from different socio-economic backgrounds. The results suggest that the majority of the pupils are aware of…

  19. Using Mixed Methods from a Communicative Orientation: Researching with Grassroots Roma

    Science.gov (United States)

    Flecha, Ramon

    2014-01-01

    Over a decade ago, researchers in Roma studies shifted their approach, from an exclusionary stance to a more communicative one. Despite major positive changes since then, researchers still do not adequately reflect the voices of the majority of the world's Roma. In this article, we draw on a communicative mixed methods case study, conducted within…

  20. Promoting Social Justice and Enhancing Educational Success: Suggestions from Twenty Educationally Successful Roma in Greece

    Science.gov (United States)

    Gkofa, Panagiota

    2017-01-01

    In Greece, Roma pupils often experience segregation through educational settings, high dropout rates, low performance outcomes, and higher levels of non-completion when compared to their Greek (non-Roma) peers. However, a small minority do stay in school and proceed to higher education. This paper draws on a set of in-depth interviews with twenty…

  1. Different and Unequal: The Educational Segregation of Roma Pupils in Europe

    Science.gov (United States)

    O'Nions, Helen

    2010-01-01

    This article analyses and welcomes the decision of the Grand Chamber of the European Court of Human Rights which held that the use of special schools for Roma pupils was contrary to the right to an education coupled with the prohibition on discrimination. The decision has wide ramifications for the education of minority, particularly Roma, pupils…

  2. Sweden's Double Decade for Roma Inclusion: An Examination of Education Policy in Context

    Science.gov (United States)

    Alexiadou, Nafsika; Norberg, Anders

    2017-01-01

    This article analyzes the Swedish Strategy for Roma Inclusion. Drawing on interviews and documentary materials produced around the Strategy by official sources and Roma organizations, we describe its background, rationale, and evolution, as well as the rifts it has revealed around the issues of minority representation and the framing of inclusion.…

  3. A Special Challenge for Europe: The Inclusion of Roma Children in Early Years Education and Care

    Science.gov (United States)

    Klaus, Sarah; Marsh, Adrian

    2014-01-01

    Provision of early childhood education and care (ECEC) for Roma children serves as a litmus test for the broader social inclusion agenda in Europe. The majority of Roma children and families live in substandard, often insecure and isolated housing and have limited access to quality health, social care and education services. There is a growing…

  4. Intercultural Policies and the Contradictory Views of Teachers: The Roma in Catalonian Schools

    Science.gov (United States)

    Beremenyi, Balint-Abel

    2011-01-01

    In this article, we examine the contradictions and lack of consistency between various levels of discourse relating to Roma educational policies. Policy-makers have claimed that political interventions would positively impact the progress of Roma. However, the results have been mixed. We argue here that teachers need to re-evaluate their roles as…

  5. Involving Roma Parents: Analysing the Good Practice of a Primary School in Ghent

    Science.gov (United States)

    Wauters, Joris; Van Mol, Christof; Clycq, Noel; Michielsen, Joris; Timmerman, Christiane

    2017-01-01

    Recently, societal and academic attention toward the topic of Roma integration has been increasing. With this article we aim to make a contribution to the domain of educational research. We explore strategies that schools can adopt to improve the involvement of Roma parents. Using a theory-based stakeholder evaluation, we more specifically analyse…

  6. International Policy and Roma Education in Europe: Essential Inputs or Centralized Distractions?

    Science.gov (United States)

    Ram, Melanie H.

    2015-01-01

    This article examines the case of Roma inclusion in education as a study of the ways in which international policy can and cannot bring change at the local level. I first reflect on the numerous international organizations and initiatives to improve the educational outcomes of Roma, and to reduce segregation and other non-inclusionary practices.…

  7. Primary care for the Roma in Europe: Position paper of the European forum for primary care

    OpenAIRE

    de Graaf Pim; Rotar Pavlič Danica; Zelko Erika; Vintges Marga; Willems Sara; Hanssens Lise

    2016-01-01

    Roma populations’ low health status and limited access to health services, including primary care, has been documented in many European countries, and warrants specific health policies and practices. A variety of experiences shows how primary care can adjust its practices to reduce the barriers to primary care for Roma populations.

  8. State of Impunity: Human Rights Abuse of Roma in Romania. Country Reports Series.

    Science.gov (United States)

    Cahn, Claude; Petrova, Dimitrina

    This report documents civil violations and discriminatory actions against Roma in Romania, contending that, due to the Romanian government's inadequate efforts to bring perpetrators of anti-Romani crimes to justice and to eradicate discrimination against Roma, a climate of impunity surrounding anti-Romani actions has taken deep root. Chapter 1…

  9. Support Programmes for Roma Children: Do They Help or Promote Exclusion?

    Science.gov (United States)

    Igarashi, Kazuyo

    2005-01-01

    This article critically examines current education programmes for Roma primary school students in the Czech Republic and the impact of these programmes. The research described here, based on in?depth case studies, challenges popular beliefs in the "success" of Roma oriented programmes, as well as the stereotypical negative images of Roma…

  10. Intercultural Policies and the Contradictory Views of Teachers: The Roma in Catalonian Schools

    Science.gov (United States)

    Beremenyi, Balint-Abel

    2011-01-01

    In this article, we examine the contradictions and lack of consistency between various levels of discourse relating to Roma educational policies. Policy-makers have claimed that political interventions would positively impact the progress of Roma. However, the results have been mixed. We argue here that teachers need to re-evaluate their roles as…

  11. Democratic Governance for Inclusion: A Case Study of a Greek Primary School Welcoming Roma Pupils

    Science.gov (United States)

    Noula, Ioanna; Cowan, Steven; Govaris, Christos

    2015-01-01

    The focus of this paper is how changes in school governance in one state primary school in a city in central Greece have resulted in a significant degree of inclusion for Roma children. This inclusivity runs counter to the disturbing occurrence of the social and ethnic segregation of a group of locally resident Roma children within schools. This…

  12. Good Practices in Roma Education in Bulgaria during the Years of Transition

    Science.gov (United States)

    Kyuchukov, Hristo

    2007-01-01

    The aim of this paper is to present good educational practices from Bulgaria that relate to Roma education. In the so-called Years of Transition, educational conditions changed considerably. Non-governmental organizations have attempted to promote high-quality education for Roma children. The Bulgarian Ministry of Education has made various…

  13. A Study on the Mothers of Roma Children Who Are a Risk Group

    Science.gov (United States)

    Orçan, Maide; Çiçekler, Canan Yildiz; Ari, Ramazan

    2014-01-01

    This study aims to define Roma mothers' views regarding their children's education and their tendency towards crime. The study is based on an illustrative case study method. The participants of this study are mothers of Roma children between the ages of 4 and 6 who live in Konya, Turkey--more specifically in the Yenimahalle neighborhood in the…

  14. Lessons for Life: Roma Children, Communal Practices, and the Global Marketplace

    Science.gov (United States)

    Christianakis, Mary

    2010-01-01

    The Roma, also known as gypsies or "tsinganoi," are amongst the oldest ethnic minorities in Europe. Nonetheless, they have been one of the most universally marginalized groups across all of the European nations. Their marginalization is evident in how Roma children have been treated in schools. Until recently, most nations have only…

  15. A Special Challenge for Europe: The Inclusion of Roma Children in Early Years Education and Care

    Science.gov (United States)

    Klaus, Sarah; Marsh, Adrian

    2014-01-01

    Provision of early childhood education and care (ECEC) for Roma children serves as a litmus test for the broader social inclusion agenda in Europe. The majority of Roma children and families live in substandard, often insecure and isolated housing and have limited access to quality health, social care and education services. There is a growing…

  16. Using Mixed Methods from a Communicative Orientation: Researching with Grassroots Roma

    Science.gov (United States)

    Flecha, Ramon

    2014-01-01

    Over a decade ago, researchers in Roma studies shifted their approach, from an exclusionary stance to a more communicative one. Despite major positive changes since then, researchers still do not adequately reflect the voices of the majority of the world's Roma. In this article, we draw on a communicative mixed methods case study, conducted within…

  17. Characteristics of Perinatal Infection and PregnancyOutcome of Roma and Romanian Women

    Institute of Scientific and Technical Information of China (English)

    Annamaria Virginas; Bela Szabo; Beata Virginas

    2015-01-01

    Introduction: The Roma are the second largest ethnic minority in Romania, the most socially and economicallydisadvantaged minority. There is a lack of studies on perinatal infection in Roma women. The study aimed at determining theprevalence of perinatal infection and comparing pregnancy outcome in Roma and Romanian pregnant women. Materials andmethods:In this prospective study total of 252 pregnant women were enrolled from August 1, 2012 to October 2013 at a tertiary carehospital in Targu-Mures, Romania. Women were screened for bacterial carriage on admission for premature rupture of membranes anddelivery. Insemination sample were collected from maternal cervix. Risk factors for colonization were collected by a questionnaire,coupled with data from an existing database. Results: The average age of Roma patient was 22, respectively 28 of the control group.There were more teenage pregnancies in the Roma group, Romanian women delivered more frequently after age 35. There was asignificant difference in socioeconomic status of the two groups. Roma women had less hypertension, gestational diabetes andobesity, more induced abortion, preterm deliveries and grand multiparity. The prevalence of negative test result in the Roma and thecontrol group were 75 % and 81%, respectively (p = 0.718). Conclusion: However the majority of Roma women had a lowsocioeconomic status with deficient pregnancy follow up, significant differences between the groups in the rates of the perinatalinfection were not observed. Further clinical trials are needed to confirm these findings.

  18. Different and Unequal: The Educational Segregation of Roma Pupils in Europe

    Science.gov (United States)

    O'Nions, Helen

    2010-01-01

    This article analyses and welcomes the decision of the Grand Chamber of the European Court of Human Rights which held that the use of special schools for Roma pupils was contrary to the right to an education coupled with the prohibition on discrimination. The decision has wide ramifications for the education of minority, particularly Roma, pupils…

  19. A Minority within a Minority? Social Justice for Traveller and Roma Children in ECEC

    Science.gov (United States)

    Murray, Colette

    2012-01-01

    This article discusses recent policy developments in Europe regarding Roma and Traveller integration and Early Childhood Provision. After a long history of oppression, Roma issues have recently become prominent on the EU policy agenda. The article discusses how these relate to developments in other areas of policy: the European children's rights…

  20. International Policy and Roma Education in Europe: Essential Inputs or Centralized Distractions?

    Science.gov (United States)

    Ram, Melanie H.

    2015-01-01

    This article examines the case of Roma inclusion in education as a study of the ways in which international policy can and cannot bring change at the local level. I first reflect on the numerous international organizations and initiatives to improve the educational outcomes of Roma, and to reduce segregation and other non-inclusionary practices.…

  1. Why Roma Do Not Like Mainstream Schools: Voices of a People without Territory.

    Science.gov (United States)

    Claveria, Julio Vargas; Alonso, Jesus Gomez

    2003-01-01

    Proposes a new approach to educational research with the Roma people based on intersubjective dialogue and egalitarian relationships between researchers and subjects. Frames these suggestions within the context of historical discrimination against the Roma and their disaffection with schooling. (Contains 88 references.) (SK)

  2. How to Move from Power-Based to Dialogic Relations? Lessons from Roma Women

    Science.gov (United States)

    Melgar, Patricia; Larena, Rosa; Ruiz, Laura; Rammel, Stephanie

    2011-01-01

    In its growth strategy for the coming decade, the EU recognises the Roma as one of several groups especially affected by poverty and social vulnerability. So far, many efforts to reverse this social exclusion have failed; imposed solutions based on power relations have ignored Roma voices and suggestions from the community. As a result, the EU now…

  3. Roma Pupils' Identification with School in Slovenia and Serbia: Case Studies

    Science.gov (United States)

    Macura-Milovanovic, Suncica; Munda, Milanka; Pecek, Mojca

    2013-01-01

    The research presented in this paper aims to challenge the belief held by some education professionals that Roma pupils do not value education. The research sample included groups of Roma pupils from two countries (Slovenia and Serbia) and from different socio-economic backgrounds. The results suggest that the majority of the pupils are aware of…

  4. The European Roma: minority representation, memory, and the limits of transnational governmentality

    NARCIS (Netherlands)

    van Baar, H.J.M.

    2011-01-01

    In The European Roma analyseert Huub van Baar de situatie van de Roma in het kader van de ingrijpende sociaaleconomische en politieke veranderingen die sinds 1989 in Europa hebben plaatsgevonden. De val van het communisme, de uitbreiding van de EU, neoliberalisme en de opleving van nationalisme hebb

  5. Primary care for the Roma in Europe: Position paper of the European forum for primary care

    Directory of Open Access Journals (Sweden)

    de Graaf Pim

    2016-09-01

    Full Text Available Roma populations’ low health status and limited access to health services, including primary care, has been documented in many European countries, and warrants specific health policies and practices. A variety of experiences shows how primary care can adjust its practices to reduce the barriers to primary care for Roma populations.

  6. Application of multifractal wavelet analysis to spontaneous fermentation processes

    CERN Document Server

    Ibarra-Junquera, V; Escalante-Minakata, P; Rosu, H C

    2007-01-01

    An algorithm is presented here to get more detailed information, of mixed culture type, based exclusively on the biomass concentrations data for fermentation processes. The analysis is performed having available only the on-line measurements of the redox potential. It is a two-step procedure which includes an Artificial Neural Network (ANN) that relates the redox potential to the biomass concentrations in the first step. Next, a multifractal wavelet analysis is performed using the biomass estimates of the process. In this context, our results show that the redox potential is a valuable indicator of microorganism metabolic activity during the spontaneous fermentation. In this paper, the detailed design of the multifractal wavelet analysis is presented, as well as its direct experimental application at the laboratory level

  7. Multifractality and herding behavior in the Japanese stock market

    Energy Technology Data Exchange (ETDEWEB)

    Cajueiro, Daniel O. [Universidade Catolica de Brasilia, Doutorado em Economia de Empresas, SGAN 916, Modulo B, Asa Norte, DF 70790-160 (Brazil); Tabak, Benjamin M. [Banco Central do Brasil, SBS Quadra 3, Bloco B, 9 andar, DF 70074-900 (Brazil)], E-mail: benjamin@ucb.br

    2009-04-15

    In this paper we present evidence of multifractality and herding behavior for a large set of Japanese stocks traded in the Tokyo Stock Exchange. We find evidence that herding behavior occurs in periods of extreme market movements. Therefore, based on the intuition behind the tests to detect herding phenomenon developed, for instance, in Christie and Huang [Christie W, Huang R. Following the pied pier: do individual returns herd around the market? Financ Analysts J 1995;51:31-7] and Chang et al. [Chang EC, Cheng JW, Khorana A. Examination of herd behavior in equity markets: an international perspective. J Bank Finance 2000;24:1651-99], we suggest that herding behavior may be one of the causes of multifractality.

  8. Multifractal analysis of weighted networks by a modified sandbox algorithm

    CERN Document Server

    Song, Yu-Qin; Yu, Zu-Guo; Li, Bao-Gen

    2015-01-01

    Complex networks have attracted growing attention in many fields. As a generalization of fractal analysis, multifractal analysis (MFA) is a useful way to systematically describe the spatial heterogeneity of both theoretical and experimental fractal patterns. Some algorithms for MFA of unweighted complex networks have been proposed in the past a few years, including the sandbox (SB) algorithm recently employed by our group. In this paper, a modified SB algorithm (we call it SBw algorithm) is proposed for MFA of weighted networks.First, we use the SBw algorithm to study the multifractal property of two families of weighted fractal networks (WFNs): "Sierpinski" WFNs and "Cantor dust" WFNs. We also discuss how the fractal dimension and generalized fractal dimensions change with the edge-weights of the WFN. From the comparison between the theoretical and numerical fractal dimensions of these networks, we can find that the proposed SBw algorithm is efficient and feasible for MFA of weighted networks. Then, we apply...

  9. Multifractal analysis of non-uniformly contracting iterated function systems

    Science.gov (United States)

    Ye, Yuan-Ling

    2017-05-01

    Let X  =  [0,1]. Given a non-uniformly contracting conformal iterated function system (IFS) ≤ft\\{{{w}j}\\right\\}j=1m and a family of positive Dini continuous potential functions ≤ft\\{ {{p}j}\\right\\}j=1m , the triple system ≤ft(X,≤ft\\{{{w}j}\\right\\}j=1m,≤ft\\{ {{p}j}\\right\\}j=1m\\right) , under some conditions, determines uniquely a probability invariant measure, denoted by μ. In this paper, we study the pressure function of the system and multifractal structure of μ. We prove that the pressure function is Gateaux differentiable and the multifractal formalism holds, if the IFS ≤ft\\{{{w}j}\\right\\}j=1m has non-overlapping.

  10. Seismic Interevent Time: A Spatial Scaling and Multifractality

    CERN Document Server

    Molchan, G

    2005-01-01

    The optimal scaling problem for the time t(LxL) between two successive events in a seismogenic cell of size L is considered. The quantity t(LxL) is defined for a random cell of a grid covering a seismic region G. We solve that problem in terms of a multifractal characteristic of epicenters in G known as the tau-function or generalized fractal dimensions; the solution depends on the type of cell randomization. Our theoretical deductions are corroborated by California seismicity with magnitude M>2. In other words, the population of waiting time distributions for L = 10-100 km provides positive information on the multifractal nature of seismicity, which impedes the population to be converted into a unified law by scaling. This study is a follow-up of our analysis of power/unified laws for seismicity (see PAGEOPH 162 (2005), 1135 and GJI 162 (2005), 899).

  11. Distributed-order diffusion equations and multifractality: Models and solutions

    Science.gov (United States)

    Sandev, Trifce; Chechkin, Aleksei V.; Korabel, Nickolay; Kantz, Holger; Sokolov, Igor M.; Metzler, Ralf

    2015-10-01

    We study distributed-order time fractional diffusion equations characterized by multifractal memory kernels, in contrast to the simple power-law kernel of common time fractional diffusion equations. Based on the physical approach to anomalous diffusion provided by the seminal Scher-Montroll-Weiss continuous time random walk, we analyze both natural and modified-form distributed-order time fractional diffusion equations and compare the two approaches. The mean squared displacement is obtained and its limiting behavior analyzed. We derive the connection between the Wiener process, described by the conventional Langevin equation and the dynamics encoded by the distributed-order time fractional diffusion equation in terms of a generalized subordination of time. A detailed analysis of the multifractal properties of distributed-order diffusion equations is provided.

  12. Multifractal heart rate dynamics in human cardiovascular model

    Science.gov (United States)

    Kotani, Kiyoshi; Takamasu, Kiyoshi; Safonov, Leonid; Yamamoto, Yoshiharu

    2003-05-01

    Human cardiovascular and/or cardio-respiratory systems are shown to exhibit both multifractal and synchronous dynamics, and we recently developed a nonlinear, physiologically plausible model for the synchronization between heartbeat and respiration (Kotani, et al. Phys. Rev. E 65: 051923, 2002). By using the same model, we now show the multifractality in the heart rate dynamics. We find that beat-to-beat monofractal noise (fractional Brownian motion) added to the brain stem cardiovascular areas results in significantly broader singularity spectra for heart rate through interactions between sympathetic and parasympathetic nervous systems. We conclude that the model proposed here would be useful in studying the complex cardiovascular and/or cardio- respiratory dynamics in humans.

  13. Multifractal modeling of the production of concentrated sugar syrup crystal

    Science.gov (United States)

    Sheng, Bi; Jianbo, Gao

    2016-07-01

    High quality, concentrated sugar syrup crystal is produced in a critical step in cane sugar production: the clarification process. It is characterized by two variables: the color of the produced sugar and its clarity degree. We show that the temporal variations of these variables follow power-law distributions and can be well modeled by multiplicative cascade multifractal processes. These interesting properties suggest that the degradation in color and clarity degree has a system-wide cause. In particular, the cascade multifractal model suggests that the degradation in color and clarity degree can be equivalently accounted for by the initial “impurities” in the sugarcane. Hence, more effective cleaning of the sugarcane before the clarification stage may lead to substantial improvement in the effect of clarification.

  14. Multifractional Spacetimes, Asymptotic Safety and HOŘAVA-LIFSHITZ Gravity

    Science.gov (United States)

    Calcagni, Gianluca

    2013-07-01

    We compare the recently formulated multifractional spacetimes with field theories of quantum gravity based on the renormalization group (RG), such as asymptotic safety and Hořava-Lifshitz gravity. The change of spacetime dimensionality with the probed scale is realized in both cases by an adaptation of the measurement tools ("rods") to the scale, but in different ways. In the multifractional case, by an adaptation of the position-space measure, which can be encoded into an explicit scale dependence of effective coordinates. In the case of RG-based theories, by an adaptation of the momenta. The two pictures are mapped into each other, thus presenting the fractal structure of spacetime in RG-based theories under an alternative perspective.

  15. Irregularities and scaling in signal and image processing: multifractal analysis

    Science.gov (United States)

    Abry, Patrice; Jaffard, Herwig; Wendt, Stéphane

    2015-03-01

    B. Mandelbrot gave a new birth to the notions of scale invariance, self-similarity and non-integer dimensions, gathering them as the founding corner-stones used to build up fractal geometry. The first purpose of the present contribution is to review and relate together these key notions, explore their interplay and show that they are different facets of a single intuition. Second, we will explain how these notions lead to the derivation of the mathematical tools underlying multifractal analysis. Third, we will reformulate these theoretical tools into a wavelet framework, hence enabling their better theoretical understanding as well as their efficient practical implementation. B. Mandelbrot used his concept of fractal geometry to analyze real-world applications of very different natures. As a tribute to his work, applications of various origins, and where multifractal analysis proved fruitful, are revisited to illustrate the theoretical developments proposed here.

  16. Roma in the Population Censuses of 1921 and 1931 on the Territory of Croatia

    Directory of Open Access Journals (Sweden)

    Danijel Vojak

    2004-12-01

    Full Text Available The author’s aim in this paper is to analyse the demographic structure of the Roma population on the territory of Croatia, Slavonia and Međimurje in the period between the two world wars. Statistical analytic methods are applied that indicate the age, gender, educational and religious structure of the Roma population in Croatia. The number of Roma on the territory of Croatia in the period between the two world wars was somewhere between 6,000 and 15,000. Most of the Roma were permanently settled and only a small part continued to carry on a nomadic life style. According to the analysed data, the Roma population was concentrated mostly in the area of Eastern Slavonia and in Podravina, whereas Dalmatia, the Croatian littoral, Lika and Krbava had a lower proportion of Roma. The Roma population lived mostly in rural settlements; only a small part lived in urban areas: Zagreb, Karlovac and Varaždin. The author emphasises the equal proportions of males and females in the Roma population, as well as their very young age structure. The majority of the Roma population accepted the dominant religion of the population of the territory in which it settled, and thus most of the Roma declared themselves as members of the Roman Catholic Church, and only a small part as Eastern Orthodox Christians. The author notes that most Roma were illiterate, and that only a small part was totally or partially literate. He emphasises that only a third of the Roma declared themselves as members of the Roma ethnic group, which indicates a low level of mutual connections and the progress of the assimilation process. Based on the population censuses of 1921 and 1931, the author concludes that as a young, illiterate and mutually non-connected group, the Roma population found itself on the margins of Croatian society, and that precisely this marginality was to become a target of the assimilation policies implemented by the regime of the WWII Independent State of Croatia.

  17. On the spin wave multifractal spectra in magnetic multilayers

    Science.gov (United States)

    Bezerra, C. G.; Albuquerque, E. L.; , E. Nogueira, Jr.

    The multifractal properties of spin wave bandwidths in quasiperiodic magnetic multilayers are studied. The profiles of the bandwidths are analyzed and the f( α) function is calculated for different values of the dimensionless in-plane wave vector kxa and for four different sequences: Fibonacci, double-period, Thue-Morse and Rudin-Shapiro. We note that the f( α) spectra is qualitatively the same for different values of kxa.

  18. Multifractal Measure of Post Distribution in Post System

    Institute of Scientific and Technical Information of China (English)

    CHEN Li; HUANG Deng-shi

    2009-01-01

    In order to investigate the true post distribution in the whole society, microelasticity (MIE) and macroelasticity (MAE) were defined by regarding all posts as a system. On this basis, the method for measuring post distribution was proposed. Using the Legendre dual transformation between MIE and MAE to highlight the probabilities of different levels, the post distribution were analyzed hierarchically. The two-scale Cantor model verified that the multifractal measure is applicable to the post distribution evolution process.

  19. Scaling and multifractal fields in the solid earth and topography

    Directory of Open Access Journals (Sweden)

    S. Lovejoy

    2007-08-01

    Full Text Available Starting about thirty years ago, new ideas in nonlinear dynamics, particularly fractals and scaling, provoked an explosive growth of research both in modeling and in experimentally characterizing geosystems over wide ranges of scale. In this review we focus on scaling advances in solid earth geophysics including the topography. To reduce the review to manageable proportions, we restrict our attention to scaling fields, i.e. to the discussion of intensive quantities such as ore concentrations, rock densities, susceptibilities, and magnetic and gravitational fields.

    We discuss the growing body of evidence showing that geofields are scaling (have power law dependencies on spatial scale, resolution, over wide ranges of both horizontal and vertical scale. Focusing on the cases where both horizontal and vertical statistics have both been estimated from proximate data, we argue that the exponents are systematically different, reflecting lithospheric stratification which – while very strong at small scales – becomes less and less pronounced at larger and larger scales, but in a scaling manner. We then discuss the necessity for treating the fields as multifractals rather than monofractals, the latter being too restrictive a framework. We discuss the consequences of multifractality for geostatistics, we then discuss cascade processes in which the same dynamical mechanism repeats scale after scale over a range. Using the binomial model first proposed by de Wijs (1951 as an example, we discuss the issues of microcanonical versus canonical conservation, algebraic ("Pareto" versus long tailed (e.g. lognormal distributions, multifractal universality, conservative and nonconservative multifractal processes, codimension versus dimension formalisms. We compare and contrast different scaling models (fractional Brownian motion, fractional Levy motion, continuous (in scale cascades, showing that they are all based on fractional integrations of noises

  20. From fractional Brownian motion to multifractional and multistable motion

    Science.gov (United States)

    Falconer, Kenneth

    2015-03-01

    Fractional Brownian motion, introduced by Benoit Mandelbrot and John Van Ness in 1968, has had a major impact on stochastic processes and their applications. We survey a few of the many developments that have stemmed from their ideas. In particular we discuss the local structure of fractional and multifractional Brownian, stable and multistable processes, emphasising the `diagonal' construction of such processes. In all this, the ubiquity and centrality of fractional Brownian motion is striking.

  1. Increasing Critical Health Literacy of Roma People trough Participatory Action Research

    DEFF Research Database (Denmark)

    Eklund Karlsson, Leena; Crondahl, Kristine

    Evidence shows that the Roma people engage less in democratic processes than the majority population. Rather than being involved in the planning of measurements and proposals, the Roma people have been treated as a helpless group in need of expert support from the authorities. To enable Roma people...... to take a leading role in their integration process a 2-year action research was implemented in 2010-2012. The idea was to strengthen the Roma Peoples’ critical health literacy which allows them to analyze and apply health information to oppose the forces that are holding them oppressed and to take better...... control over their life situation. The objective of this paper is to discuss methodological issues based on experiences of the use of participatory research approach in increasing health literacy. Methods: The core of the intervention was ‘training of trainers’ of a group of Roma people from western...

  2. Increasing Critical Health Literacy of Roma People trough Participatory Action Research

    DEFF Research Database (Denmark)

    Eklund Karlsson, Leena; Crondahl, Kristine

    Evidence shows that the Roma people engage less in democratic processes than the majority population. Rather than being involved in the planning of measurements and proposals, the Roma people have been treated as a helpless group in need of expert support from the authorities. To enable Roma people...... to take a leading role in their integration process a 2-year action research was implemented in 2010-2012. The idea was to strengthen the Roma Peoples’ critical health literacy which allows them to analyze and apply health information to oppose the forces that are holding them oppressed and to take better...... control over their life situation. The objective of this paper is to discuss methodological issues based on experiences of the use of participatory research approach in increasing health literacy. Methods: The core of the intervention was ‘training of trainers’ of a group of Roma people from western...

  3. Lacunarity and multifractal analysis of the large DLA mass distribution

    Science.gov (United States)

    Rodriguez-Romo, Suemi; Sosa-Herrera, Antonio

    2013-08-01

    We show the methodology used to analyze fractal and mass-multifractal properties of very large Diffusion-Limited Aggregation (DLA) clusters with a maximum of 109 particles for 2D aggregates and 108 particles for 3D clusters, to support our main result; the scaling behavior obtained by our experimental results corresponds to the expected performance of monofractal objects. In order to estimate lacunarity measures for large DLA clusters, we develop a variant of the gliding-box algorithm which reduces the computer time needed to obtain experimental results. We show how our mass multifractal data have a tendency to present monofractal behavior for the mass distribution of the cases presented in this paper in the limit of very large clusters. Lacunarity analysis shows, provided we study small clusters mass distributions, data which might be interpreted as two different values of fractal dimensions while the cluster grows; however, this effect tends to vanish when the cluster size increases further, in such a way that monofractality is achieved. The outcomes of this paper lead us to conclude that the previously reported mass multifractality behavior (Vicsek et al., 1990 [13]) detected for DLA clusters is a consequence of finite size effects and floating point precision limitations and not an intrinsic feature of the phenomena, since the scaling behavior of our DLA clusters space corresponds to monofractal objects, being this situation remarkably noticeable in the limit of very large clusters.

  4. Multifractal comparison of the painting techniques of adults and children

    Science.gov (United States)

    Mureika, J. R.; Fairbanks, M. S.; Taylor, R. P.

    2010-02-01

    Statistical analysis of art, particularly of the abstract genre, is becoming an increasingly important tool for understanding the image creation process. We present a multifractal clustering analysis of non-representational images painted by adults and children using a 'pouring' technique. The effective dimensions (D0) are measured for each, as is the associated multifractal depth ▵D = D0 - DOO. It is shown that children create paintings whose dimensions D0 are less than those created by adults. The effective dimensions for adult painters tend to cluster around 1.8, while those for children assume typical values of 1.6. In a similar fashion, the multifractal depths for images painted by adults and children show statistically-significant differences in their values. Adult paintings show a relatively shallow depth (▵D ~ 0.02), while children's paintings show a much greater depth (▵D ~ 0.1). Given that the 'pouring' technique reflects the body motions of the artist, the results suggest that the differences in the paintings' fractal characteristics are potential indicators of artist physiology.

  5. Intermittency and multifractional Brownian character of geomagnetic time series

    Directory of Open Access Journals (Sweden)

    G. Consolini

    2013-07-01

    Full Text Available The Earth's magnetosphere exhibits a complex behavior in response to the solar wind conditions. This behavior, which is described in terms of mutifractional Brownian motions, could be the consequence of the occurrence of dynamical phase transitions. On the other hand, it has been shown that the dynamics of the geomagnetic signals is also characterized by intermittency at the smallest temporal scales. Here, we focus on the existence of a possible relationship in the geomagnetic time series between the multifractional Brownian motion character and the occurrence of intermittency. In detail, we investigate the multifractional nature of two long time series of the horizontal intensity of the Earth's magnetic field as measured at L'Aquila Geomagnetic Observatory during two years (2001 and 2008, which correspond to different conditions of solar activity. We propose a possible double origin of the intermittent character of the small-scale magnetic field fluctuations, which is related to both the multifractional nature of the geomagnetic field and the intermittent character of the disturbance level. Our results suggest a more complex nature of the geomagnetic response to solar wind changes than previously thought.

  6. Multifractal analysis of low-latitude geomagnetic fluctuations

    Directory of Open Access Journals (Sweden)

    M. J. A. Bolzan

    2009-02-01

    Full Text Available The technique of large deviation multifractal spectrum has shown that the high-latitude (77.5° N, 69.2° W geomagnetic fluctuations can be described from direct dissipation process or loading-unloading regimes of the solar wind-magnetosphere coupling. In this paper, we analyze the H-component of low-latitude (22.4° S, 43.6° W geomagnetic field variability observed during the month of July 2000 at the Geomagnetic Observatory, Vassouras, RJ, Brazil. The variability pattern during this period is a mixture of quiet and disturbed days including the Bastille Day intense geomagnetic storm on 15 July. Due to the complexity of this data, we pursue a detailed analysis of the geomagnetic fluctuations in different time scales including a multifractal approach using the singular power spectrum deviations obtained from the wavelet transform modulus maxima (WTMM. The results suggest, as observed from high-latitude data, the occurrence of low-latitude multifractal processes driving the intermittent coupling between the solar wind-magnetosphere and geomagnetic field variations. On finer scales possible physical mechanisms in the context of nonlinear magnetosphere response are discussed.

  7. Strong anticipation: Multifractal cascade dynamics modulate scaling in synchronization behaviors

    Energy Technology Data Exchange (ETDEWEB)

    Stephen, Damian G., E-mail: foovian@gmail.co [Wyss Institute for Biologically Inspired Engineering, Harvard University, 3 Blackfan Circle, Floor 5, Boston, MA 02115 (United States); Dixon, James A. [Department of Psychology, University of Connecticut, 406 Babbidge Rd., Unit 1020, Storrs, CT 06269-1020 (United States); Haskins Laboratories, 300 George St., New Haven, CT 06511 (United States)

    2011-01-15

    Research highlights: We investigated anticipatory behaviors in response to chaotic metronomes. We assessed multifractal structure in tap intervals and onset intervals. Strength of multifractality in tap intervals appears to match that in onset intervals. - Abstract: Previous research on anticipatory behaviors has found that the fractal scaling of human behavior may attune to the fractal scaling of an unpredictable signal [Stephen DG, Stepp N, Dixon JA, Turvey MT. Strong anticipation: Sensitivity to long-range correlations in synchronization behavior. Physica A 2008;387:5271-8]. We propose to explain this attunement as a case of multifractal cascade dynamics [Schertzer D, Lovejoy S. Generalised scale invariance in turbulent phenomena. Physico-Chem Hydrodyn J 1985;6:623-5] in which perceptual-motor fluctuations are coordinated across multiple time scales. This account will serve to sharpen the contrast between strong and weak anticipation: whereas the former entails a sensitivity to the intermittent temporal structure of an unpredictable signal, the latter simply predicts sensitivity to an aggregate description of an unpredictable signal irrespective of actual sequence. We pursue this distinction through a reanalysis of Stephen et al.'s data by examining the relationship between the widths of singularity spectra for intertap interval time series and for each corresponding interonset interval time series. We find that the attunement of fractal scaling reported by Stephen et al. was not the trivial result of sensitivity to temporal structure in aggregate but reflected a subtle sensitivity to the coordination across multiple time scales of fluctuation in the unpredictable signal.

  8. Symmetry relations for multifractal spectra at random critical points

    Science.gov (United States)

    Monthus, Cécile; Berche, Bertrand; Chatelain, Christophe

    2009-12-01

    Random critical points are generically characterized by multifractal properties. In the field of Anderson localization, Mirlin et al (2006 Phys. Rev. Lett. 97 046803) have proposed that the singularity spectrum f(α) of eigenfunctions satisfies the exact symmetry f(2d-α) = f(α)+d-α. In the present paper, we analyze the physical origin of this symmetry in relation to the Gallavotti-Cohen fluctuation relations of large deviation functions that are well known in the field of non-equilibrium dynamics: the multifractal spectrum of the disordered model corresponds to the large deviation function of the rescaling exponent γ = (α-d) along a renormalization trajectory in the effective time t = lnL. We conclude that the symmetry discovered for the specific example of Anderson transitions should actually be satisfied at many other random critical points after an appropriate translation. For many-body random phase transitions, where the critical properties are usually analyzed in terms of the multifractal spectrum H(a) and of the moment exponents X(N) of the two-point correlation function (Ludwig 1990 Nucl. Phys. B 330 639), the symmetry becomes H(2X(1)-a) = H(a)+a-X(1), or equivalently Δ(N) = Δ(1-N) for the anomalous parts \\Delta (N) \\equiv X(N)-NX(1) . We present numerical tests favoring this symmetry for the 2D random Q-state Potts model with varying Q.

  9. Stochastic Calculus with respect to multifractional Brownian motion

    CERN Document Server

    Lebovits, Joachim

    2011-01-01

    Stochastic calculus with respect to fractional Brownian motion (fBm) has attracted a lot of interest in recent years, motivated in particular by applications in finance and Internet traffic modeling. Multifractional Brownian motion (mBm) is a Gaussian extension of fBm that allows to control the pointwise regularity of the paths of the process and to decouple it from its long range dependence properties. This generalization is obtained by replacing the constant Hurst parameter H of fBm by a function h(t). Multifractional Brownian motion has proved useful in many applications, including the ones just mentioned. In this work we extend to mBm the construction of a stochastic integral with respect to fBm. This stochastic integral is based on white noise theory, as originally proposed in [15], [6], [4] and in [5]. In that view, a multifractional white noise is defined, which allows to integrate with respect to mBm a large class of stochastic processes using Wick products. It\\^o formulas (both for tempered distribut...

  10. Genetic and biochemical characteristics in the Roma minority in the South Bohemia Region.

    Science.gov (United States)

    Adámková, Věra; Hubáček, Jaroslav A; Nováková, Dita; Dolák, František; Adámek, Václav; Lánská, Věra; Tóthová, Valérie; Šedová, Lenka

    2015-01-01

    At present, health characteristics of Roma minority within the Czech Republic are generally unknown. Therefore we examined a Roma population for some anthropometrical, biochemical and genetic parameters. Groups include Roma aged above 18 years (men, women), with permanent residence in the South Bohemia Region. The Roma group (302 individuals) was selected using the snowball sampling method--the same method was used to select the non-Roma control group (78 individuals) for total cholesterol and blood sugar reference values. The main non-Roma control group was selected using the quota selection method (298 individuals). All participants completed a life style questionnaire, had their body measurements taken, were weighed, had their blood pressure and heart rates measured, had a capillary blood sample taken. The non-Roma population had a lower Body Mass Index (BMI) (25.86 ± 4.23 vs. 27.45 ± 6.48 kg/m², p = 0.0004). The difference in BMI and weight was found to be associated with the MC4R gene. The values of systolic and diastolic blood pressure, total cholesterol, blood sugar did not differ with regard to the tested polymorphisms. We did not find any difference in the prevalence of MC4R or TMEM18 between groups. Despite educational efforts to introduce healthier life styles into the Roma population, there has been only limited success; as a result, Roma are very likely to suffer from premature complications of atherosclerotic processes, mostly due to theirs life style. Intensive further research is needed to improve the health conditions of the Roma minority, while still respecting their cultural differences.

  11. Multifractal Geophysical Extremes: Nonstationarity and Long Range Correlations

    Science.gov (United States)

    Tchiguirinskaia, I.; Schertzer, D.; Lovejoy, S.

    2012-04-01

    Throughout the world, extremes in environmental sciences are of prime importance. They are key variables not only for risk assessments and engineering designs (e.g. of dams and bridges), but also for resource management (e.g. water and energy) and for land use. A better understanding of them is more and more indispensable in settling the debate on their possible climatological evolution. Whereas it took decades before a uniform technique for estimating flow frequencies within a stationary framework, it is often claimed that « stationarity is dead ! ». The fact that geophysical and environmental fields are variable over a wider range of scales than previously thought require to go beyond the limits of the (classical) Extreme Value Theory (EVT). Indeed, long-range correlations are beyond the scope of the classical EVT theory. We show that multifractal concepts and techniques are particularly appealing because they can effectively deal with a cascade of interactions concentrating for instance energy, liquid water, etc. into smaller and smaller space-time domains. Furthermore, a general outcome of these cascade processes -which surprisingly was realized only rather recently- is that rather independently of their details they yield probability distributions with power-law fall-offs, often called (asymptotic) Pareto or Zipf laws. We discuss the corresponding probability distributions of their maxima and its relationship with the Frechet law. We use these multifractal techniques to investigate the possibility of using very short or incomplete data records for reliable statistical predictions of the extremes. In particular we assess the multifractal parameter uncertainty with the help of long synthetic multifractal series and their sub-samples, in particular to obtain an approximation of confidence intervals that would be particularly important for the predictions of multifractal extremes. We finally illustrate the efficiency of this approach with its application to

  12. Genetic studies of the Roma (Gypsies: a review

    Directory of Open Access Journals (Sweden)

    Gresham David

    2001-04-01

    Full Text Available Abstract Background Data provided by the social sciences as well as genetic research suggest that the 8-10 million Roma (Gypsies who live in Europe today are best described as a conglomerate of genetically isolated founder populations. The relationship between the traditional social structure observed by the Roma, where the Group is the primary unit, and the boundaries, demographic history and biological relatedness of the diverse founder populations appears complex and has not been addressed by population genetic studies. Results Recent medical genetic research has identified a number of novel, or previously known but rare conditions, caused by private founder mutations. A summary of the findings, provided in this review, should assist diagnosis and counselling in affected families, and promote future collaborative research. The available incomplete epidemiological data suggest a non-random distribution of disease-causing mutations among Romani groups. Conclusion Although far from systematic, the published information indicates that medical genetics has an important role to play in improving the health of this underprivileged and forgotten people of Europe. Reported carrier rates for some Mendelian disorders are in the range of 5 -15%, sufficient to justify newborn screening and early treatment, or community-based education and carrier testing programs for disorders where no therapy is currently available. To be most productive, future studies of the epidemiology of single gene disorders should take social organisation and cultural anthropology into consideration, thus allowing the targeting of public health programs and contributing to the understanding of population structure and demographic history of the Roma.

  13. Multifractal Analysis of Typhoons: the case study of Bolaven (2012)

    Science.gov (United States)

    Lee, Jisun; Paz, Igor; Ichiba, Abdellah; Tchiguirinskaia, Ioulia; Schertzer, Daniel; Lee, Dong-In; Kuo, Hung-Chi

    2017-04-01

    Multifractals have become rather standard tools to analyze and simulate meteorological and hydrological data, especially radar data that have the rare advantage of providing space-time (3D+1) fields. However, in spite of their inherent capacity to deal with extreme multiscale phenomena like typhoons, as well as an increased availability of higher quality data, there had been not so many multifractal studies of typhoons since pioneering studies (Chygyrynsakaia et al 1994, Lazarev et al 1994), which relied on time series data obtained from 1D aircraft or balloon trajectories. This lack of new developments might have impeded significant progress in predicting typhoon evolution prediction. We therefore decided to jointly understand the dynamics and rainfall by multifractal space-time analysis with the help of the joint measurements of the Typhoon Bolaven by three Doppler S-band radars. This experimental set-up not only provided accurate estimates of the rainfall intensity, but also of the 3 components of the wind velocity. Typhoon Bolaven is one of the typhoons that caused the largest damages with severe rainfall all over Korea including Jeju Island with more than 250 mm in 2 days in 2012. It was regarded as the most powerful storm to strike the Korean Peninsula in nearly a decade, with wind gusts measured up to 186 km h-1. The three radars were respectively located in Gosan, and Seongsan, in Jeju Island, and Jindo, in southwest of Korea peninsula, i.e. all around the region where the typhoon intensity was the largest. The largest distance between the radars was approximately 100km, and the rainfall and wind velocity were estimated on a grid of 360×360×60 every ten minutes. The multifractal analysis of this large amount of data (space time Trace Method and Double Trace Method) was performed to better understand through scales the fast transformation of potential energy into kinetic energy and the premier role of convection. In particular, this analysis confirms power

  14. La Dea Roma de Segóbriga

    Directory of Open Access Journals (Sweden)

    Martín ALMAGRO-GORBEA

    2009-12-01

    Full Text Available Una hermosa escultura romana a la que hemos creído podríamos llamar desde ahora la «Dea Roma de Segóbriga», realizada en mármol blanco. Ahora ofrece una acusada pátina de color hueso. Mide 1,95 m. de altura, 0,69 de anchura máxima y 0,54 de grueso en su parte más voluminosa. Se conserva en el Museo de Cuenca.

  15. Asymmetric multifractal detrending moving average analysis in time series of PM2.5 concentration

    Science.gov (United States)

    Zhang, Chen; Ni, Zhiwei; Ni, Liping; Li, Jingming; Zhou, Longfei

    2016-09-01

    In this paper, we propose the asymmetric multifractal detrending moving average analysis (A-MFDMA) method to explore the asymmetric correlation in non-stationary time series. The proposed method is applied to explore the asymmetric correlation of PM2.5 daily average concentration with uptrends or downtrends in China. In addition, shuffling and phase randomization procedures are applied to detect the sources of multifractality. The results show that existences of asymmetric correlations, and the asymmetric correlations are multifractal. Further, the multifractal scaling behavior in the Chinese PM2.5 is caused not only by long-range correlation but also by fat-tailed distribution, but the major source of multifractality is fat-tailed distribution.

  16. Multifractal analysis of the fracture surfaces of foamed polypropylene/polyethylene blends

    Science.gov (United States)

    Liu, Chuang; Jiang, Xiu-Lei; Liu, Tao; Zhao, Ling; Zhou, Wei-Xing; Yuan, Wei-Kang

    2009-01-01

    The two-dimensional multifractal detrended fluctuation analysis is applied to reveal the multifractal properties of the fracture surfaces of foamed polypropylene/polyethylene (PP/PE) blends at different temperatures. Nice power-law scaling relationship between the detrended fluctuation function Fq and the scale s is observed for different orders q and the scaling exponent h(q) is found to be a nonlinear function of q, confirming the presence of multifractality in the fracture surfaces. The multifractal spectra f(α) are obtained numerically through Legendre transform. The shape of the multifractal spectrum of singularities can be well captured by the width of spectrum Δα and the difference of dimension Δf. With the increase of the PE content, the fracture surface becomes more irregular and complex, as is manifested by the facts that Δα increases and Δf decreases from positive to negative. A qualitative interpretation is provided based on the foaming process.

  17. A comparison between two OLS-based approaches to estimating urban multifractal parameters

    CERN Document Server

    Huang, Linshan

    2016-01-01

    Multifractal theory provides a powerful tool to describe urban form and growth, but many basic problems remain to be solved. Among various pending problems, the most significant one is how to obtain proper multifractal dimension spectrums. If an algorithm is improperly used, the parameter values will be abnormal. This paper is devoted to drawing a comparison between two OLS-based approaches for estimating urban multifractal parameters. Using observational data and empirical analysis, we will demonstrate how to utilize the double logarithmic linear regression to evaluate multifractal parameters. The OLS regression analysis has two different approaches. One is to fix the intercept to zero, and the other is not to fix it. The case studies show that the advisable method is to constrain the intercept to zero. The zero-intercept regression yields proper multifractal parameter spectrums within certain scale range of moment order, while the common regression results are not normal. In practice, the zero-intercept reg...

  18. Cecílio Romaña, o sinal de Romaña e a doença de Chagas

    Directory of Open Access Journals (Sweden)

    João Carlos Pinto Dias

    1997-10-01

    Full Text Available Recentemente falecido em Barcelona, Cecílio Romaña foi um importante tropicologista argentino com muitas contribuições à clínica, ao controle e à patologia da doença de Chagas entre 1930 e 1960. Em 1935, Romaña tornou-se famoso por sua precisa descrição do complexo oftalmo-ganglionar, o mais típico dos sinais de porta de entrada da doença de Chagas humana, sinal este que logo ficou conhecido em toda a América Latina com o nome de "sinal de Romaña", por proposição de dois pesquisadores brasileiros, Emmanuel Dias e Evandro Chagas. O achado de Romaña causou enorme polêmica com o grande Salvador Mazza, que não reconheceu a especificidade do sinal e, muito menos, aceitou a proposta nomenclatura. Estes fatos são relatados no presente artigo, que homenageia Cecílio Romaña e destaca o enorme impacto de sua descoberta para o conhecimento da doença de Chagas aguda em toda sua área endêmica.Cecílio Romaña was an important Argentinean researcher dedicated to tropical diseases in the period 1930-1960, recently died in Barcelona. Working mainly on the epidemiological, clinical and pathological aspects of American trypanosomiasis, Romaña became very famous in 1935 when he accurately described the most typical portal recognized in all the endemic area with the cognomen of "Romaña sign". This description caused an enormous polemic with Romaña's then director, the great Salvador Mazza, who never accepted the specificity of the sign and, much less, its popular name (which was proposed by the Brazilian researchers Emmanuel Dias and Evandro Chagas. This history is briefly summarized in the present article, as well as the great impact of Romaña's discovery in the recognition of the acute Chagas' disease in all the endemic area.

  19. Distinguishing cognitive state with multifractal complexity of hippocampal interspike interval sequences

    Directory of Open Access Journals (Sweden)

    Dustin eFetterhoff

    2015-09-01

    Full Text Available Fractality, represented as self-similar repeating patterns, is ubiquitous in nature and the brain. Dynamic patterns of hippocampal spike trains are known to exhibit multifractal properties during working memory processing; however, it is unclear whether the multifractal properties inherent to hippocampal spike trains reflect active cognitive processing. To examine this possibility, hippocampal neuronal ensembles were recorded from rats before, during and after a spatial working memory task following administration of tetrahydrocannabinol (THC, a memory-impairing component of cannabis. Multifractal detrended fluctuation analysis was performed on hippocampal interspike interval sequences to determine characteristics of monofractal long-range temporal correlations (LRTCs, quantified by the Hurst exponent, and the degree/magnitude of multifractal complexity, quantified by the width of the singularity spectrum. Our results demonstrate that multifractal firing patterns of hippocampal spike trains are a marker of functional memory processing, as they are more complex during the working memory task and significantly reduced following administration of memory impairing THC doses. Conversely, LRTCs are largest during resting state recordings, therefore reflecting different information compared to multifractality. In order to deepen conceptual understanding of multifractal complexity and LRTCs, these measures were compared to classical methods using hippocampal frequency content and firing variability measures. These results showed that LRTCs, multifractality, and theta rhythm represent independent processes, while delta rhythm correlated with multifractality. Taken together, these results provide a novel perspective on memory function by demonstrating that the multifractal nature of spike trains reflects hippocampal microcircuit activity that can be used to detect and quantify cognitive, physiological and pathological states.

  20. THE IMPACT OF CULTURE ON HEALTHCARE SEEKING BEHAVIOUR OF KALDERASH ROMA. A QUALITATIVE DESCRIPTIVE STUDY

    Directory of Open Access Journals (Sweden)

    Gabriel ROMAN

    2012-05-01

    Full Text Available Some ethnic groups, as the Roma, are thought to have different healthcare seeking behaviour. This paper aims to provide findings on the attitudes, preferences, expectations and concerns of a Roma ethnic group (Kalderash regarding inpatient hospitalization. The findings focus on a series of data analysed from semi-structured interviews with 23 Kalderash patients and caregivers from Zanea community (county of Iasi, north-eastern part of Romania. Kalderash people have negative attitudes towards hospitalization and report significant anxieties. The findings reveal specificities related to patients’ ethnic background, cultural views and communication barriers. For their part, Roma are often suspicious of non-Roma people and institutions. Roma ideas about hospital are closely related to notions of purity and impurity. These basic concepts affect everyday life during inpatient hospitalization, including the way Roma deal with eating and washing, physicians and treatments, or coping with illness and death. When they seek medical care, Roma often come into conflict with medical personnel who find their behaviour confusing and demanding. Roma’s cultural beliefs and attitudes underlie their behaviour when they are being confronted with a serious illness and are seeking inpatient medical care. Attention to cultural diversity does matter, as this should lead to different medical behavioural patterns.

  1. The Roma as a Protected Minority? Policies and Best Practices in the EU

    Directory of Open Access Journals (Sweden)

    Sigrid Lipott

    2012-12-01

    Full Text Available The Roma people are one of the most heterogeneous minority groups in Europe, encompassing a broad variety of cultural traits and linguistic diversity, resulting in numerous sub-groups and fragmented identities. However, the group defines itself as a 'unified non- territorial transnational nation'. The most recent developments at European level show an increasing willingness to adopt minority rights documents directed to autochthonous minorities. This has provided also the Roma, or part of them, with opportunities to be granted effective protection with support in the rights-based approach. The following paper will focus on the issue of Roma minority protection in the EU. The first two sections introduce the key features present in the debate regarding Roma minorities, highlighting the in-group diversity. The third one analyses the different legal status of the Roma communities in the EU. The fourth section highlights the importance of a framework instrument for the protection of territorial minorities at a macro-regional level. The fifth part gives an overview on the European Roma policy and the sixth section looks at best practices in Europe as far as protection of Roma is concerned: lessons can be learned, in this respect, from Slovenia and Sweden. The level of protection will be analysed at both theoretical and empirical level, through the help of the results of a small scale research carried out among minority members.

  2. Policies to improve the health and well-being of Roma people: the European experience.

    Science.gov (United States)

    Fésüs, Gabriella; Östlin, Piroska; McKee, Martin; Ádány, Róza

    2012-04-01

    The Roma constitute the largest ethnic minority in the European Region. The many policy initiatives designed over the past two decades to tackle their adverse social conditions in Central and South Eastern Europe, where the Roma population is concentrated, have had limited success. This paper reviews what is being done to improve the health and social situation of Roma communities in the Region and identifies factors that may limit the effectiveness of these policy initiatives. Strong political commitment, measures to overcome prejudices against Roma, inter-sectoral policy coordination, adequate budgets, evidence-based policies, and Roma involvement can be identified as key preconditions for improved health outcomes and well-being. However, developing a sound evidence-based approach to Roma inclusion requires removing obstacles to the collection of reliable data and improving analytical and evaluation capacity. Health policies seeking to reduce health inequalities for Roma people need to be aligned with education, economic, labour market, housing, environmental and territorial development policies and form part of comprehensive policy frameworks allowing for effective integration.

  3. Collective identity and well-being of Bulgarian Roma adolescents and their mothers.

    Science.gov (United States)

    Dimitrova, Radosveta; Chasiotis, Athanasios; Bender, Michael; van de Vijver, Fons J R

    2014-03-01

    In Europe and specifically in Bulgaria, Roma represent the largest indigenous ethnic minority exposed to severe discrimination, social exclusion, poverty, and compromised well-being. To improve their conditions, identifying sources of psychological well-being for Roma is theoretically relevant and practically important. This study investigated the relation between ethnic, familial, and religious identities as salient collective identity components for psychological well-being among 194 Roma adolescents (age: M = 16.11 years, SD = 1.36) and their mothers (age: M = 35.95 years, SD = 3.54). The results indicated that in line with marginalization models of acculturation, Roma youth and their mothers showed a low endorsement of both Bulgarian mainstream and Roma ethnic identity. The average scores of well-being were also low. For both groups, familial identity was stronger compared to Roma, Bulgarian, and religious identity. A path model showed that collective identity was a positive predictor of well-being in both adolescents and mothers and that the mothers' collective identity was a predictor of adolescent well-being. Bulgarian mainstream identity had the strongest relationship with collective identity. It is concluded that, for Roma youth and their mothers, family is an important identity domain as it represents the most salient identification source that is not challenged in their environment.

  4. Hate Speech or Genocidal Discourse? An Examination of Anti-Roma Sentiment in Contemporary Europe

    Directory of Open Access Journals (Sweden)

    Emma Townsend

    2014-08-01

    Full Text Available Roma in contemporary Europe are the frequent targets of hate speech and discriminatory state policies. Despite being the largest minority in the European Union with a population of 10-12 million, they are frequently denied a space in European society, and are widely perceived to be unchangeable and inherently ‘other’. As a result, Roma experience substantially inferior life conditions when compared to majority European populations. Despite the many recent European Union initiatives and action plans, such as the Decade of Roma Inclusion (2005-2015, the situation of Roma in contemporary Europe is not improving, and in some cases is actually worsening. This persecution is not a modern phenomenon; Roma have suffered stigmatisation and exclusion throughout their history in Europe. The severity and continuity of the persecution of Roma at the hands of a multitude of European authorities suggests the presence of an underlying motivation or intent that informs both the rhetoric about and treatment of Romani people. This paper will examine if the persecution of Roma in contemporary Europe is guided by a genocidal discourse. To this end, the boundaries between hate speech, genocidal discourse, and incitement to genocide will be scrutinised. It will be argued that both the way the Roma are spoken about and the treatment they receive are informed by a genocidal discourse that has endured relatively unchanged throughout their history in Europe. Roma are not just racially vilified, rather their culture as well as their physical presence in contemporary Europe are widely devalued in both words and in state action. Any improvement in their situation is therefore unlikely while this discourse continues.

  5. Social housing and situation of Roma minority in Albania

    Directory of Open Access Journals (Sweden)

    Lindita Xhillari

    2016-03-01

    Full Text Available The right to social housing is sanctioned as a fundamental human right in a number of international instruments ratified by Albania, but currently this right does not find adequate protection in Albania’s legislation. The Committee on Economic, Social and Cultural Affairs of the United Nations, has set standards concerning the right to adequate housing. The right to social housing should not be equated with having a roof over head, but should be seen as the right to live somewhere safely and with dignity. The right to social housing should be provided to all people regardless of their income and implemented in a manner consistent with their resources. Lack of an adequate legal framework of the right to housing, today has consequences on several issues as for examples the case of the eviction of Roma to the Lake area in Tirana, lack of adequate housing, families with low income, beneficiary families by the aid schemes, homeless women victims of domestic violence, or even the category of tenants housed in former state apartments. Through this paper we will seek to cover many issues and present some recommendations for the improvement and creation of facilities for vulnerable groups such as the Roma minority, in order to meet and set objective standards regarding social housing

  6. Il cielo sopra Roma I luoghi dell’astronomia

    CERN Document Server

    Buonanno, Roberto

    2008-01-01

    L’astronomia a Roma c’è sempre stata, ma un po’ nascosta: era nei palazzi, nelle chiese o, meglio, sopra le chiese, specole disseminate lungo un percorso che oramai conoscono in pochi. I romani hanno assistito, incuriositi ed impauriti, al rogo di Giordano Bruno in un angolo di Campo de' Fiori a loro familiare, ma probabilmente non capirono bene di quale colpa fosse accusato. Non pensarono certo che si trattasse di un filosofo e di uno scienziato che aveva cercato di immaginare in che modo era fatto il mondo. Chi era questo Galileo, di cui si celebrava il processo a S. Maria sopra Minerva? Era un uomo che voleva cambiare la prospettiva del mondo e che, per questo, era stato ammonito da Roberto Bellarmino. E chi era questo gesuita, Secchi, che nel 1870 costringeva gli Italiani a privare Roma del suo Osservatorio Astronomico, visto che il Direttore non riconosceva lo Stato Italiano? Come è possibile che dopo la visita di Hitler a Mussolini alla vigilia della Guerra, la Germania decise di regalare all’...

  7. High prevalence of CYP2C19*2 allele in Roma samples: study on Roma and Hungarian population samples with review of the literature.

    Science.gov (United States)

    Sipeky, Csilla; Weber, Agnes; Szabo, Melinda; Melegh, Bela I; Janicsek, Ingrid; Tarlos, Greta; Szabo, Istvan; Sumegi, Katalin; Melegh, Bela

    2013-08-01

    The purpose of our study was to characterise the CYP2C19*2 and CYP2C19*3 alleles in healthy Roma and Hungarian populations. DNA of 500 Roma and 370 Hungarian subjects were genotyped for CYP2C19*2 (G681A, rs4244285) and CYP2C19*3 (G636A, rs4986893) by PCR-RFLP assay and direct sequencing. Significant differences were found comparing the Roma and Hungarian populations in CYP2C19 681 GG (63.6 vs. 75.9%), GA (31.8 vs. 23.0%), AA (4.6 vs. 1.1%), GA+AA (36.4 vs. 24.1%) and A allele frequencies (0.205 vs. 0.125) (pRoma and Hungarian samples in CYP2C19*1 (79.5 vs. 87.4%) and CYP2C19*2 (20.5 vs. 12.6%) alleles, respectively (pRoma than in Hungarians, respectively. Genotype distribution of the Roma population was similar to those of the population of North India, however, a major difference was found in the frequency of the CYP2C19*2 allele, which is likely a result of admixture with European lineages. In conclusion, the frequencies of the CYP2C19 alleles, genotypes and corresponding extensive, intermediate and poor metabolizer phenotypes studied here in the Hungarian population are similar to those of other European Caucasian populations, but display clear differences when compared to the Roma population.

  8. Roma Hip Hop as a Multiculturalist Soundtrack. R-Point: The Pedagogy of a Policy

    Directory of Open Access Journals (Sweden)

    Ana Banić-Grubišić

    2016-02-01

    Full Text Available This paper examines the phenomenon of Roma hip hop in Serbia, its origins and popularization through music workshops for Roma children organized by the non-governmental organization R-Point. The paper analyzes a supposedly liberatory cultural practice, and argues that its designing „from above“, through non-governmental agencies' projects whose declarative aim is to help the Roma, actually petrifies their identity, reducing their entire cultural output to certain elements attractive to the dominant culture and traditionally recognized as „Roma“.

  9. El impacto del reglamento «Roma I» en el contrato internacional de agencia

    OpenAIRE

    Aguilar Grieder, Hilda

    2011-01-01

    El Reglamento «Roma I» sobre la ley aplicable a las obligaciones contractuales ha introducido modifi caciones sustanciales relevantes con respecto a su antecesor: el Convenio de Roma. Algunas de las novedades del Reglamento «Roma I» afectan al régimen general de determinación de la lex contractus, dentro del cual queda encuadrado uno de los contratos más habituales en la práctica comercial internacional de nuestros días: el contrato internacional de agencia comercial. El presente ...

  10. Multifractal characteristics of Nitrogen adsorption isotherms from tropical soils

    Science.gov (United States)

    Vidal Vázquez, Eva; Paz Ferreiro, Jorge

    2010-05-01

    One of the primary methods used to characterize a wide range of porous materials, including soils, are gas adsorption isotherms. An adsorption isotherm is a function relating the amount of adsorbed gas or vapour to the respective equilibrium pressure, during pressure increase at constant temperature. Adsorption data allow easily estimates of specific surface area and also can provide a characterization of pore surface heterogeneity. Most of the properties and the reactivity of soil colloids are influenced by their specific surface area and by parameters describing the surface heterogeneity. For a restricted scale range, linearity between applied pressure and volume of adsorbate holds, which is the basis for current estimations of specific surface area. However, adsorption isotherms contain also non-linear segments of pressure versus volume so that evidence of multifractal scale has been demonstrated. The aim of this study was to analyze the multifractal behaviour of nitrogen adsorption isotherms from a set of tropical soils. Samples were collected form 54 horizons belonging to 19 soil profiles in the state of Minas Gerais, Brazil. The most frequent soil type was Oxisol, according to the Soil Survey Staff, equivalent to Latossolo in the Brazilian soil classification system. Nitrogen adsorption isotherms at standard 77 K were measured using a Thermo Finnigan Sorptomatic 1990 gas sorption analyzer (Thermo Scientific, Waltham, MA). From the raw data a distributions of mass along a support was obtained to perform multifractal analysis. The probability distribution was constructed by dividing the values of the measure in a given segment by the sum of the measure in the whole scale range. The box-counting method was employed to perform multifractal analysis. All the analyzed N2 adsorption isotherms behave like a multifractal system. The singularity spectra, f(α), showed asymmetric concave down parabolic shapes, with a greater tendency toward the left side, where moments

  11. Statistical and Multifractal Evaluation of Soil Compaction in a Vineyard

    Science.gov (United States)

    Marinho, M.; Raposo, J. R.; Mirás Avalos, J. M.; Paz González, A.

    2012-04-01

    One of the detrimental effects caused by agricultural machines is soil compaction, which can be defined by an increase in soil bulk density. Soil compaction often has a negative impact on plant growth, since it reduces the macroporosity and soil permeability and increases resistance to penetration. Our research explored the effect of the agricultural machinery on soil when trafficking through a vineyard at a small spatial scale, based on the evaluation of the soil compaction status. The objectives of this study were: i) to quantify soil bulk density along transects following wine row, wheel track and outside track, and, ii) to characterize the variability of the bulk density along these transects using multifractal analysis. The field work was conducted at the experimental farm of EVEGA (Viticulture and Enology Centre of Galicia) located in Ponte San Clodio, Leiro, Orense, Spain. Three parallel transects were marked on positions with contrasting machine traffic effects, i.e. vine row, wheel-track and outside-track. Undisturbed samples were collected in 16 points of each transect, spaced 0.50 m apart, for bulk density determination using the cylinder method. Samples were taken in autumn 2011, after grape harvest. Since soil between vine rows was tilled and homogenized beginning spring 2011, cumulative effects of traffic during the vine growth period could be evaluated. The distribution patterns of soil bulk density were characterized by multifractal analysis carried out by the method of moments. Multifractality was assessed by several indexes derived from the mass exponent, τq, the generalized dimension, Dq, and the singularity spectrum, f(α), curves. Mean soil bulk density values determined for vine row, outside-track and wheel-track transects were 1.212 kg dm-3, 1.259 kg dm-3and 1.582 kg dm-3, respectively. The respective coefficients of variation (CV) for these three transects were 7.76%, 4.82% and 2.03%. Therefore mean bulk density under wheel-track was 30

  12. Sense of coherence and self-reported health among Roma people in Sweden--a pilot study.

    Science.gov (United States)

    Hassler, Sven; Eklund, Leena

    2012-05-04

    The Roma people have been known in Europe for a 1000 years, during which they have usually been the subject of discrimination and oppression leading to isolation, powerlessness and poor health. The objective of this study is to investigate the sense of coherence (SOC) in relation to self-reported health among a group of Roma people in southwest Sweden. A cross-sectional, quantitative pilot study. A questionnaire was constructed based on the Short-Form Health Survey (SF-12) and Antonovsky's Sense of Coherence Scale (SOC-13) and was distributed among Roma people in southwest Sweden (n =102). Self-reported health was summarised in a physical score (PCS) and a mental score (MCS). Comparisons were made with a general Swedish majority population and a Sami population. The health scores were significantly lower among the Roma people compared to Swedes - PCS: Roma 46.0 (Swedes 52.0) and MCS: Roma 47.5 (Swedes 52.6). The SOC score for the Roma people (54.4) was significantly lower than that of the Swedes (65.2) and Sami (65.0). The low SOC with the Swedish majority society is a strong indication of the marginalisation and exclusion of the Roma people from mainstream society. Low scores in self-reported health among the Roma people also establishes the serious health risks the Roma people are experiencing through their present life situation.

  13. Sense of coherence and self-reported health among Roma people in Sweden – a pilot study

    Science.gov (United States)

    Hassler, Sven; Eklund, Leena

    2012-01-01

    Objectives The Roma people have been known in Europe for a 1000 years, during which they have usually been the subject of discrimination and oppression leading to isolation, powerlessness and poor health. The objective of this study is to investigate the sense of coherence (SOC) in relation to self-reported health among a group of Roma people in southwest Sweden. Study design A cross-sectional, quantitative pilot study. Methods A questionnaire was constructed based on the Short-Form Health Survey (SF-12) and Antonovsky's Sense of Coherence Scale (SOC-13) and was distributed among Roma people in southwest Sweden (n = 102). Self-reported health was summarised in a physical score (PCS) and a mental score (MCS). Comparisons were made with a general Swedish majority population and a Sami population. Results The health scores were significantly lower among the Roma people compared to Swedes – PCS: Roma 46.0 (Swedes 52.0) and MCS: Roma 47.5 (Swedes 52.6). The SOC score for the Roma people (54.4) was significantly lower than that of the Swedes (65.2) and Sami (65.0). Conclusions The low SOC with the Swedish majority society is a strong indication of the marginalisation and exclusion of the Roma people from mainstream society. Low scores in self-reported health among the Roma people also establishes the serious health risks the Roma people are experiencing through their present life situation. PMID:22584516

  14. Multifractal spectrum and lacunarity as measures of complexity of osseointegration.

    Science.gov (United States)

    de Souza Santos, Daniel; Dos Santos, Leonardo Cavalcanti Bezerra; de Albuquerque Tavares Carvalho, Alessandra; Leão, Jair Carneiro; Delrieux, Claudio; Stosic, Tatijana; Stosic, Borko

    2016-07-01

    The goal of this study is to contribute to a better quantitative description of the early stages of osseointegration, by application of fractal, multifractal, and lacunarity analysis. Fractal, multifractal, and lacunarity analysis are performed on scanning electron microscopy (SEM) images of titanium implants that were first subjected to different treatment combinations of i) sand blasting, ii) acid etching, and iii) exposition to calcium phosphate, and were then submersed in a simulated body fluid (SBF) for 30 days. All the three numerical techniques are applied to the implant SEM images before and after SBF immersion, in order to provide a comprehensive set of common quantitative descriptors. It is found that implants subjected to different physicochemical treatments before submersion in SBF exhibit a rather similar level of complexity, while the great variety of crystal forms after SBF submersion reveals rather different quantitative measures (reflecting complexity), for different treatments. In particular, it is found that acid treatment, in most combinations with the other considered treatments, leads to a higher fractal dimension (more uniform distribution of crystals), lower lacunarity (lesser variation in gap sizes), and narrowing of the multifractal spectrum (smaller fluctuations on different scales). The current quantitative description has shown the capacity to capture the main features of complex images of implant surfaces, for several different treatments. Such quantitative description should provide a fundamental tool for future large scale systematic studies, considering the large variety of possible implant treatments and their combinations. Quantitative description of early stages of osseointegration on titanium implants with different treatments should help develop a better understanding of this phenomenon, in general, and provide basis for further systematic experimental studies. Clinical practice should benefit from such studies in the long

  15. A comparison of multifractal behavior in galaxy samples from SDSS

    Science.gov (United States)

    García-Farieta, J. E.; Casas-Miranda, R. A.

    2017-07-01

    We studied the spatial distribution of galaxies with samples from the Sloan Digital Sky Survey (SDSS) including observational holes in the masks. From a multifractal formalism and using the sliding window technique for each sample, we have determined the fractal dimension and the lacunarity spectrum. Aditionally, the scale of homogeneity was determined for each struture parameter. Our results show that the galaxy clustering exhibits a behavior that depends on the radial distance, revealing that the hierarchical distribution is not a fractal at large-scales, with a transition to homogeneity on large scales below 130 Mpc/h.

  16. Multifractional Fourier Transform Method and Its Applications to Image Encryption

    Institute of Scientific and Technical Information of China (English)

    RANQiwen; WANGQi; MAJing; TANLiying

    2003-01-01

    The multiplicity of the fractional Fourier transform(FRFT),which is intrinsic in any fractional operator,has been claimed by several authors,but never across-the-board developed.Particularly,the weight-type FRFT(WFRFT) has not been investigated.Starting with defining the multifractional Fourier transform (MFRFT),we gained the generalization permutation matrix group (GPMG)representation and multiplicity of the MFRFT,and the relationships among the MFRFT the standard WFRFT and the standard CFRFT.Finally,as a application,a novel image encryption method hased on the MFRFT is propounded.Similation results show that this method is safe,practicable and impactful.

  17. Unveiling the Multi-fractal Structure of Complex Networks

    CERN Document Server

    Jalan, Sarika; Sarkar, Camellia; Boccaletti, Stefano

    2016-01-01

    The fractal nature of graphs has traditionally been investigated by using the nodes of networks as the basic units. Here, instead, we propose to concentrate on the graph edges, and introduce a practical and computationally not demanding method for revealing changes in the fractal behavior of networks, and particularly for allowing distinction between mono-fractal, quasi mono-fractal, and multi-fractal structures. We show that degree homogeneity plays a crucial role in determining the fractal nature of the underlying network, and report on six different protein-protein interaction networks along with their corresponding random networks. Our analysis allows to identify varying levels of complexity in the species.

  18. Approximated maximum likelihood estimation in multifractal random walks

    CERN Document Server

    Løvsletten, Ola

    2011-01-01

    We present an approximated maximum likelihood method for the multifractal random walk processes of [E. Bacry et al., Phys. Rev. E 64, 026103 (2001)]. The likelihood is computed using a Laplace approximation and a truncation in the dependency structure for the latent volatility. The procedure is implemented as a package in the R computer language. Its performance is tested on synthetic data and compared to an inference approach based on the generalized method of moments. The method is applied to estimate parameters for various financial stock indices.

  19. Local multifractal detrended fluctuation analysis for non-stationary image's texture segmentation

    Science.gov (United States)

    Wang, Fang; Li, Zong-shou; Li, Jin-wei

    2014-12-01

    Feature extraction plays a great important role in image processing and pattern recognition. As a power tool, multifractal theory is recently employed for this job. However, traditional multifractal methods are proposed to analyze the objects with stationary measure and cannot for non-stationary measure. The works of this paper is twofold. First, the definition of stationary image and 2D image feature detection methods are proposed. Second, a novel feature extraction scheme for non-stationary image is proposed by local multifractal detrended fluctuation analysis (Local MF-DFA), which is based on 2D MF-DFA. A set of new multifractal descriptors, called local generalized Hurst exponent (Lhq) is defined to characterize the local scaling properties of textures. To test the proposed method, both the novel texture descriptor and other two multifractal indicators, namely, local Hölder coefficients based on capacity measure and multifractal dimension Dq based on multifractal differential box-counting (MDBC) method, are compared in segmentation experiments. The first experiment indicates that the segmentation results obtained by the proposed Lhq are better than the MDBC-based Dq slightly and superior to the local Hölder coefficients significantly. The results in the second experiment demonstrate that the Lhq can distinguish the texture images more effectively and provide more robust segmentations than the MDBC-based Dq significantly.

  20. Multiscale multifractal detrended fluctuation analysis of earthquake magnitude series of Southern California

    Science.gov (United States)

    Fan, Xingxing; Lin, Min

    2017-08-01

    The multifractal characteristics of magnitude time series of earthquakes that occurred in Southern California from 1990 to 2010 are studied in this work. A method for the scale division of the magnitude of these earthquakes based on empirical mode decomposition (EMD) and multifractal analysis is proposed. This method gains a new insight into measuring multifractal properties of the magnitude time series at multiple scales, and it reveals further information about the dynamic seismic behavior. By using EMD, a time series can be decomposed into mode time series that represent different time-frequency components. We find that time-frequency components show long-range correlation with different Hurst exponents by using R / S analysis. Based on the different fractal structures of components, we consider three different scale series: Micro-, Mid- and Macro-scale subsequences, which are superposed and reconstructed by the components. The multifractal properties of the three scale subsequences are analyzed by using multifractal detrended fluctuation analysis (MF-DFA). The results show that the three different scale subsequences have various shapes of multifractal spectra and corresponding distinct properties. The Micro-scale subsequence singularity spectrum shows left-skewed, indicating a relative dominance of the lower Hurst exponent; the Mid-scale subsequence has a right-skewed singularity spectrum; the Macro-scale subsequence exhibits the most significant persistence and shows the strongest multifractality.

  1. Three-Dimensional Surface Parameters and Multi-Fractal Spectrum of Corroded Steel.

    Science.gov (United States)

    Shanhua, Xu; Songbo, Ren; Youde, Wang

    2015-01-01

    To study multi-fractal behavior of corroded steel surface, a range of fractal surfaces of corroded surfaces of Q235 steel were constructed by using the Weierstrass-Mandelbrot method under a high total accuracy. The multi-fractal spectrum of fractal surface of corroded steel was calculated to study the multi-fractal characteristics of the W-M corroded surface. Based on the shape feature of the multi-fractal spectrum of corroded steel surface, the least squares method was applied to the quadratic fitting of the multi-fractal spectrum of corroded surface. The fitting function was quantitatively analyzed to simplify the calculation of multi-fractal characteristics of corroded surface. The results showed that the multi-fractal spectrum of corroded surface was fitted well with the method using quadratic curve fitting, and the evolution rules and trends were forecasted accurately. The findings can be applied to research on the mechanisms of corroded surface formation of steel and provide a new approach for the establishment of corrosion damage constitutive models of steel.

  2. Investigation of multifractal nature of floating potential fluctuations obtained from a dc glow discharge magnetized plasma

    Science.gov (United States)

    Shaw, Pankaj Kumar; Saha, Debajyoti; Ghosh, Sabuj; Janaki, M. S.; Iyengar, A. N. Sekar

    2017-03-01

    In this paper, multifractal detrended fluctuation analysis (MF-DFA) has been used to analyze the floating potential fluctuations obtained with a Langmuir probe from a dc glow discharge magnetized plasma device. The generalized Hurst exponents (h(q)) , local fluctuation function (Fq(s)) , the Rényi exponents (τ(q)) and the multifractal spectrum F(α) have been calculated by applying the MF-DFA method. The result of the MF-DFA shows the multifractal nature of these fluctuations. We have investigated the influence of magnetic field on the multifractal nature of the fluctuations and it is seen that degree of multifractality is reduced with the increase in the magnetic field strength. The values of h(q) have been restricted between 0.7 and 1 for the magnetized fluctuations. This result is evidence of the existence of long-range correlations in the fluctuations. Furthermore, we employed shuffle and surrogate approaches to analyze the origins of multifractality. Comparing the MF-DFA results for the data set to those for shuffled and surrogate series, we have found that its multifractal nature is due to the existence of significant long-term correlation.

  3. In situ detection of small-size insect pests sampled on traps using multifractal analysis

    Science.gov (United States)

    Xia, Chunlei; Lee, Jang-Myung; Li, Yan; Chung, Bu-Keun; Chon, Tae-Soo

    2012-02-01

    We introduce a multifractal analysis for detecting the small-size pest (e.g., whitefly) images from a sticky trap in situ. An automatic attraction system is utilized for collecting pests from greenhouse plants. We applied multifractal analysis to segment action of whitefly images based on the local singularity and global image characteristics. According to the theory of multifractal dimension, the candidate blobs of whiteflies are initially defined from the sticky-trap image. Two schemes, fixed thresholding and regional minima obtainment, were utilized for feature extraction of candidate whitefly image areas. The experiment was conducted with the field images in a greenhouse. Detection results were compared with other adaptive segmentation algorithms. Values of F measuring precision and recall score were higher for the proposed multifractal analysis (96.5%) compared with conventional methods such as Watershed (92.2%) and Otsu (73.1%). The true positive rate of multifractal analysis was 94.3% and the false positive rate minimal level at 1.3%. Detection performance was further tested via human observation. The degree of scattering between manual and automatic counting was remarkably higher with multifractal analysis (R2=0.992) compared with Watershed (R2=0.895) and Otsu (R2=0.353), ensuring overall detection of the small-size pests is most feasible with multifractal analysis in field conditions.

  4. Atomic force microscopy study, kinetic roughening and multifractal analysis of electrodeposited silver films

    Science.gov (United States)

    Nasehnejad, M.; Gholipour Shahraki, M.; Nabiyouni, G.

    2016-12-01

    We used atomic force microscopy (AFM) to study surface morphology and kinetic roughening of Ag films. X-ray diffraction (XRD) technique is used to verify the films crystalline structure. The influence of film thickness on the kinetic roughening was investigated using AFM data and roughness calculation. It is revealed that the surface roughness increases with increasing the film thickness. The data also consist with a complex behavior which is called as anomalous scaling. Scaling laws analysis for Ag films presents two distinct dynamics including large local and scale roughness and indicates a power law dependency on the thickness of film. AFM images have been characterized by the multifractal analysis. This analysis shows that the self-similar and multifractal characteristics as well as anomalous scaling exist in the Ag film morphologies. Description of the quantitative growth and surface morphology was done by the multifractal spectra, f (α) - α . It is found that the multifractal spectrum shape is left hook-like (that is difference of height interval of the multifractal spectrum, Δf = f (αmin) - f (αmax) > 0). The results indicate that the surfaces having greater roughness give rise the wider multifractal spectrum width (Δα) and the greater Δf, thus, the nonuniformity of the height probabilities becomes larger. It indicates that the multifractality of the films becomes more pronounced at the higher thickness.

  5. An analysis of multifractal characteristics of API time series in Nanjing, China

    Science.gov (United States)

    Shen, Chen-hua; Huang, Yi; Yan, Ya-ni

    2016-06-01

    This paper describes multifractal characteristics of daily air pollution index (API) records in Nanjing from 2001 to 2012. The entire daily API time series is first divided into 12 parts that serve as research objects, and the generalized Hurst exponent is calculated for each series. And then, the multifractal sources are analyzed and singularity spectra are shown. Next, based on a singularity spectrum, the multifractal-characteristics parameters (maximum exponent α0, spectrum width Δ α, and asymmetry Δ αas) are introduced. The results show that the fractality of daily API for each year is multifractal. The multifractal sources originate from both a broad probability density function and different long-range correlations with small and large fluctuations. The strength of the distribution multifractality is stronger than that of the correlation multifractality. The variation in the structure of API time series with increasing years is mainly related to long-range correlations. The structure of API time series in some years is richer. These findings can provide a scientific basis for further probing into the complexity of API.

  6. Three-Dimensional Surface Parameters and Multi-Fractal Spectrum of Corroded Steel.

    Directory of Open Access Journals (Sweden)

    Xu Shanhua

    Full Text Available To study multi-fractal behavior of corroded steel surface, a range of fractal surfaces of corroded surfaces of Q235 steel were constructed by using the Weierstrass-Mandelbrot method under a high total accuracy. The multi-fractal spectrum of fractal surface of corroded steel was calculated to study the multi-fractal characteristics of the W-M corroded surface. Based on the shape feature of the multi-fractal spectrum of corroded steel surface, the least squares method was applied to the quadratic fitting of the multi-fractal spectrum of corroded surface. The fitting function was quantitatively analyzed to simplify the calculation of multi-fractal characteristics of corroded surface. The results showed that the multi-fractal spectrum of corroded surface was fitted well with the method using quadratic curve fitting, and the evolution rules and trends were forecasted accurately. The findings can be applied to research on the mechanisms of corroded surface formation of steel and provide a new approach for the establishment of corrosion damage constitutive models of steel.

  7. The construction of the Roma female identity and the negotiation of tradition

    Directory of Open Access Journals (Sweden)

    Octavian SOFRONEA

    2015-05-01

    Full Text Available This article constitutes itself as an insight into the construction of the Roma female identity, and the negotiation of tradition, using three fundamental concepts that most of the academic Romanian literature does not define suitably: tradition, community, and identity. The theme of this article will be analyzed from a gender perspective, in the sense that women could have a special role in the process of reconsidering tradition. The first chapter provides a theoretical perspective of Roma female identity, defining the concepts related to this issue. In the second chapter, I will apply these concepts in a case study about a group of gypsies in Pitești, Romania, analyzing the construction of identity in the case of Roma women and the negotiation of the Roma female model in education, using a qualitative approach. In conclusion, I would like to show in what sense this analysis may be useful in the development of effective public policies on the gipsy issue.

  8. Sense of coherence and self-reported health among Roma people in Sweden a pilot study

    DEFF Research Database (Denmark)

    Eklund Karlsson, Leena; Hassler, Sven

    2012-01-01

    Objectives. The Roma people have been known in Europe for a 1000 years, during which they have usually been the subject of discrimination and oppression leading to isolation, powerlessness and poor health. The objective of this study is to investigate the sense of coherence (SOC) in relation...... to self-reported health among a group of Roma people in southwest Sweden. Study design. A cross-sectional, quantitative pilot study. Methods. A questionnaire was constructed based on the Short-Form Health Survey (SF-12) and Antonovsky’s Sense of Coherence Scale (SOC-13) and was distributed among Roma...... people in Southwest Sweden (n102). Self-reported health was summarised in a physical score (PCS) and a mental score (MCS). Comparisons were made with a general Swedish majority population and a Sami population. Results. The health scores were significantly lower among the Roma people compared to Swedes...

  9. Multifractals in Western Major STOCK Markets Historical Volatilities in Times of Financial Crisis

    Science.gov (United States)

    Lahmiri, Salim

    In this paper, the generalized Hurst exponent is used to investigate multifractal properties of historical volatility (CHV) in stock market price and return series before, during and after 2008 financial crisis. Empirical results from NASDAQ, S&P500, TSE, CAC40, DAX, and FTSE stock market data show that there is strong evidence of multifractal patterns in HV of both price and return series. In addition, financial crisis deeply affected the behavior and degree of multifractality in volatility of Western financial markets at price and return levels.

  10. Effective multifractal features of high-frequency price fluctuations time series and l-variability diagrams

    Energy Technology Data Exchange (ETDEWEB)

    Souza, Jeferson de [Laboratorio de Analise de Bacias e Petrofisica, Departamento de Geologia, Universidade Federal do Parana, Centro Politecnico - Jardim das Americas, Caixa Postal 19001, 81531-990 Curitiba-PR (Brazil); Centro Brasileiro de Pesquisas Fisicas, Rua Dr. Xavier Sigaud 150, 22290-180 Rio de Janeiro-RJ (Brazil)], E-mail: jdesouza@ufpr.br; Duarte Queiros, Silvio M. [Centro Brasileiro de Pesquisas Fisicas, Rua Dr. Xavier Sigaud 150, 22290-180 Rio de Janeiro-RJ (Brazil)], E-mail: sdqueiro@googlemail.com

    2009-11-30

    In this manuscript we present a comprehensive study on the multifractal properties of high-frequency price fluctuations and instantaneous volatility of the equities that compose the Dow Jones Industrial Average. The analysis consists about the quantification of the influence of dependence and non-Gaussianity on the multifractal character of financial quantities. Our results point out an equivalent importance of dependence and non-Gaussianity on the multifractality of time series. Moreover, we analyse l-diagrams of price fluctuations. In the latter case, we show that the fractal dimension of these maps is basically independent of the lag between price fluctuations that we assume.

  11. The SARD variety of multi-fractality of ventricular epicardial mapping during ischemia

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    We have analyzed cardiac ischemia-reperfusion in an animal model using epicardial electropotential mapping. We investigated the relationship between ischemia and variability of multifractality in epicardial electrograms. We present a new parameter called the singularity spectrum area reference dispersion (SARD) that clearly demonstrates the change in multifractility with the extent of myocardiaischemia. By contrasting the 3D ventricular epicardial SARD map with the activation map, we conclude that myocardial ischemia significantly influences the variety of multifractality of ventricular epicardium electrograms and the SARD parameter is useful in correlating multifractality of epicardial elec- trograms with location of ischemia closely.

  12. Noisy random resistor networks: renormalized field theory for the multifractal moments of the current distribution.

    Science.gov (United States)

    Stenull, O; Janssen, H K

    2001-03-01

    We study the multifractal moments of the current distribution in randomly diluted resistor networks near the percolation threshold. When an external current is applied between two terminals x and x(') of the network, the lth multifractal moment scales as M((l))(I)(x,x(')) approximately equal /x-x'/(psi(l)/nu), where nu is the correlation length exponent of the isotropic percolation universality class. By applying our concept of master operators [Europhys. Lett. 51, 539 (2000)] we calculate the family of multifractal exponents [psi(l)] for l>or=0 to two-loop order. We find that our result is in good agreement with numerical data for three dimensions.

  13. Multifractal structure of the large-scale heliospheric magnetic field strength fluctuations near 85AU

    Directory of Open Access Journals (Sweden)

    L. F. Burlaga

    2004-01-01

    Full Text Available During 2002, the Voyager 1 spacecraft was in the heliosphere between 83.4 and 85.9AU (1AU is the mean distance from the Sun to Earth at 34° N heliographic latitude. The magnetic field strength profile observed in this region had a multifractal structure in the range of scales from 2 to 16 days. The multifractal spectrum observed near 85AU is similar to that observed near 40AU, indicating relatively little evolution of the multifractal structure of the magnetic field with increasing distance in the distant heliosphere in the epoch near solar maximum.

  14. Access to primary healthcare services for the Roma population in Serbia: a secondary data analysis

    Science.gov (United States)

    2011-01-01

    Background Serbia has proclaimed access to healthcare as a human right. In a context wherein the Roma population are disadvantaged, the aim of this study was to assess whether the Roma population are able to effectively access primary care services, and if not, what barriers prevent them from doing so. The history of the Roma in Serbia is described in detail so as to provide a context for their current vulnerable position. Methods Disaggregated data were analyzed from three population groups in Serbia; the general population, the Roma population, and the poorest quintile of the general population not including the Roma. The effective coverage framework, which incorporates availability, affordability, accessibility, acceptability, and effectiveness of health services, was used to structure the secondary data analysis. Acute respiratory infection (ARI) in children less than five years of age was used as an example as this is the leading cause of death in children under 5 years old in Serbia. Results Roma children were significantly more likely to experience an ARI than either the general population or the poorest quintile of the general population, not including the Roma. All three population groups were equally likely to not receive the correct treatment regime of antibiotics. An analysis of the factors that affect quality of access to health services reveal that personal documentation is a statistically significant problem; availability of health services is not an issue that disproportionately affects the Roma; however the geographical accessibility and affordability are substantive issues that disproportionately affect the Roma population. Affordability of services affected the Roma and the poorest quintile and affordability of medications significantly affected all three population groups. With regards to acceptability, mothers from all three population groups are equally likely to recognize the importance of seeking treatment. Conclusions The Roma should be

  15. The construction of the Roma female identity and the negotiation of tradition

    OpenAIRE

    Octavian SOFRONEA

    2015-01-01

    This article constitutes itself as an insight into the construction of the Roma female identity, and the negotiation of tradition, using three fundamental concepts that most of the academic Romanian literature does not define suitably: tradition, community, and identity. The theme of this article will be analyzed from a gender perspective, in the sense that women could have a special role in the process of reconsidering tradition. The first chapter provides a theoretical perspective of Roma f...

  16. Patterns of Discrimination, Grievances and Political Activity Among Europe's Roma: A Cross-Sectional Analysis

    Directory of Open Access Journals (Sweden)

    Jonathan Fox

    2001-01-01

    Full Text Available The purpose of this study is to analyse in a large-n cross-sectional format the patterns of discrimination, grievances and political activity among European Roma (Gypsies using data from the Minority at Risk project. The model tested here is a two-step model positing that discrimination leads to grievance formation which in turn leads to protest and rebellion. The results show that the Roma, in general, conform to this model but differ in some important specifics.

  17. Racial and social discrimination in the EFL class: the case of the roma minority

    OpenAIRE

    Madrid, Daniel

    2011-01-01

    This paper aims to study Andalusian students??? and teachers??? perceptions of social and racial discrimination in the EFL class with special reference to the Roma (gypsy) minority. After a brief introduction on racial discrimination in the world, figures are presented to illustrate the situation in Spain, especially with regard to the Roma ethnic minority in Andalusian schools. The main premises of critical race theory and some studies which have contributed to clarifying the ...

  18. Low vaccination coverage of Greek Roma children amid economic crisis: national survey using stratified cluster sampling

    Science.gov (United States)

    Petraki, Ioanna; Arkoudis, Chrisoula; Terzidis, Agis; Smyrnakis, Emmanouil; Benos, Alexis; Panagiotopoulos, Takis

    2017-01-01

    Abstract Background: Research on Roma health is fragmentary as major methodological obstacles often exist. Reliable estimates on vaccination coverage of Roma children at a national level and identification of risk factors for low coverage could play an instrumental role in developing evidence-based policies to promote vaccination in this marginalized population group. Methods: We carried out a national vaccination coverage survey of Roma children. Thirty Roma settlements, stratified by geographical region and settlement type, were included; 7–10 children aged 24–77 months were selected from each settlement using systematic sampling. Information on children’s vaccination coverage was collected from multiple sources. In the analysis we applied weights for each stratum, identified through a consensus process. Results: A total of 251 Roma children participated in the study. A vaccination document was presented for the large majority (86%). We found very low vaccination coverage for all vaccines. In 35–39% of children ‘minimum vaccination’ (DTP3 and IPV2 and MMR1) was administered, while 34–38% had received HepB3 and 31–35% Hib3; no child was vaccinated against tuberculosis in the first year of life. Better living conditions and primary care services close to Roma settlements were associated with higher vaccination indices. Conclusions: Our study showed inadequate vaccination coverage of Roma children in Greece, much lower than that of the non-minority child population. This serious public health challenge should be systematically addressed, or, amid continuing economic recession, the gap may widen. Valid national estimates on important characteristics of the Roma population can contribute to planning inclusion policies. PMID:27694159

  19. Health impact assessment of Roma housing policies in Central and Eastern Europe: A comparative analysis

    Energy Technology Data Exchange (ETDEWEB)

    Molnar, Agnes, E-mail: molnar.agnes@sph.unideb.hu [Faculty of Public Health, Medical and Health Science Centre, University of Debrecen, PO Box 2, H-4012 Debrecen (Hungary); Adam, Balazs, E-mail: adam.balazs@sph.unideb.hu [Faculty of Public Health, Medical and Health Science Centre, University of Debrecen, PO Box 2, H-4012 Debrecen (Hungary); Antova, Temenujka, E-mail: t.antova@ncphp.government.bg [National Center of Public Health Protection, 15, Ivan Ev. Geshov blvd, 1431 Sofia (Bulgaria); Bosak, Lubos, E-mail: bosak@centrum.sk [Department of Public Health, Faculty of Health Care and Social Work, Trnava University, 1 Univerzitne namestie, 917 00 Trnava (Slovakia); Dimitrov, Plamen, E-mail: p.dimitrov@ncphp.government.bg [National Center of Public Health Protection, 15, Ivan Ev. Geshov blvd, 1431 Sofia (Bulgaria); Mileva, Hristina, E-mail: hmileva@yahoo.com [Ministry of Health, 5 Sveta Nedelya Square, 1000 Sofia (Bulgaria); Pekarcikova, Jarmila, E-mail: jkorcova@truni.sk [Department of Public Health, Faculty of Health Care and Social Work, Trnava University, 1 Univerzitne namestie, 917 00 Trnava (Slovakia); Zurlyte, Ingrida, E-mail: ingrida@post.omnitel.net [State Environmental Health Center, Kalvariju str. 153, 08221 Vilnius (Lithuania); Gulis, Gabriel, E-mail: GGulis@health.sdu.dk [Unit for Health Promotion Research, University of Southern Denmark, Niels Bohrs Vej 9, 6700 Esbjerg (Denmark); Adany, Roza, E-mail: adany.roza@sph.unideb.hu [Faculty of Public Health, Medical and Health Science Centre, University of Debrecen, PO Box 2, H-4012 Debrecen (Hungary); Kosa, Karolina, E-mail: karolina.kosa@sph.unideb.hu [Faculty of Public Health, Medical and Health Science Centre, University of Debrecen, PO Box 2, H-4012 Debrecen (Hungary)

    2012-02-15

    Marginalised Roma communities in European countries live in substandard housing conditions the improvement of which has been one of the major issues of the Decade of Roma Inclusion, the ongoing intergovernmental European Roma programme. The paper presents EU-funded health impact assessments of national Roma housing policies and programmes in 3 Central and Eastern European countries in light of the evaluation of a completed local project in a fourth CEE country so as to compare predicted effects to observed ones. Housing was predicted to have beneficial health effects by improving indoor and outdoor conditions, access to services, and socioeconomic conditions. Negative impacts were predicted only in terms of maintenance expenses and housing tenure. However, observed impacts of the completed local project did not fully support predictions especially in terms of social networks, satisfaction with housing and neighbourhood, and inhabitant safety. In order to improve the predictive value of HIA, more evidence should be produced by the careful evaluation of locally implemented housing projects. In addition, current evidence is in favour of planning Roma housing projects at the local rather than at the national level in alignment with the principle of subsidiarity. - Highlights: Black-Right-Pointing-Pointer Predictive validity of HIA of national Roma housing policies - in light of current evidence - is low. Black-Right-Pointing-Pointer Implemented housing projects should be comprehensively evaluated to improve reliability of HIA. Black-Right-Pointing-Pointer Roma housing projects should be planned at the local rather than at the national level. Black-Right-Pointing-Pointer HIA should be used to plan Roma housing projects at the local level.

  20. Defining urban and rural regions by multifractal spectrums of urbanization

    CERN Document Server

    Chen, Yanguang

    2015-01-01

    The spatial pattern of urban-rural regional system is associated with the dynamic process of urbanization. How to characterize the urban-rural terrain using quantitative measurement is a difficult problem remaining to be solved. This paper is devoted to defining urban and rural regions using ideas from fractals. A basic postulate is that human geographical systems are of self-similar patterns associated with recursive processes. Then multifractal geometry can be employed to describe or define the urban and rural terrain with the level of urbanization. A space-filling index of urban-rural region based on the generalized correlation dimension is presented to reflect the degree of geo-spatial utilization in terms of urbanization. The census data of America and China are adopted to show how to make empirical analyses of urban-rural multifractals. This work is not so much a positive analysis as a normative study, but it proposes a new way of investigating urban and rural regional systems using fractal theory.

  1. Laser image denoising technique based on multi-fractal theory

    Science.gov (United States)

    Du, Lin; Sun, Huayan; Tian, Weiqing; Wang, Shuai

    2014-02-01

    The noise of laser images is complex, which includes additive noise and multiplicative noise. Considering the features of laser images, the basic processing capacity and defects of the common algorithm, this paper introduces the fractal theory into the research of laser image denoising. The research of laser image denoising is implemented mainly through the analysis of the singularity exponent of each pixel in fractal space and the feature of multi-fractal spectrum. According to the quantitative and qualitative evaluation of the processed image, the laser image processing technique based on fractal theory not only effectively removes the complicated noise of the laser images obtained by range-gated laser active imaging system, but can also maintains the detail information when implementing the image denoising processing. For different laser images, multi-fractal denoising technique can increase SNR of the laser image at least 1~2dB compared with other denoising techniques, which basically meet the needs of the laser image denoising technique.

  2. ABC of multi-fractal spacetimes and fractional sea turtles

    Energy Technology Data Exchange (ETDEWEB)

    Calcagni, Gianluca [Instituto de Estructura de la Materia, CSIC, Madrid (Spain)

    2016-04-15

    We clarify what it means to have a spacetime fractal geometry in quantum gravity and show that its properties differ from those of usual fractals. A weak and a strong definition of multi-scale and multi-fractal spacetimes are given together with a sketch of the landscape of multi-scale theories of gravitation. Then, in the context of the fractional theory with q-derivatives, we explore the consequences of living in a multi-fractal spacetime. To illustrate the behavior of a non-relativistic body, we take the entertaining example of a sea turtle. We show that, when only the time direction is fractal, sea turtles swim at a faster speed than in an ordinary world, while they swim at a slower speed if only the spatial directions are fractal. The latter type of geometry is the one most commonly found in quantum gravity. For time-like fractals, relativistic objects can exceed the speed of light, but strongly so only if their size is smaller than the range of particle-physics interactions. We also find new results about log-oscillating measures, the measure presentation and their role in physical observations and in future extensions to nowhere-differentiable stochastic spacetimes. (orig.)

  3. Sandbox algorithm for multifractal analysis of complex networks

    CERN Document Server

    Liu, Jin-Long; Anh, Vo

    2014-01-01

    Complex networks have attracted much attention in diverse areas of science and technology. Multifractal analysis (MFA) is a useful way to systematically describe the spatial heterogeneity of both theoretical and experimental fractal patterns. In this paper, we introduce a new algorithm --- the sandbox (SB) algorithm, for MFA of complex networks. First we compare the SB algorithm with two existing algorithms of MFA for complex networks: the compact-box-burning (CBB) algorithm proposed by Furuya and Yakubo ( Phys. Rev. E, 84 (2011) 036118), and the improved box-counting (BC) algorithm proposed by Li et al. ( J. Stat. Mech.: Theor. Exp., 2014 (2014) P02020) by calculating the mass exponents tau(q) of some deterministic model networks. We make a detailed comparison between the numerical and theoretical results of these model networks. The comparison results show that the SB algorithm is the most effective and feasible algorithm to calculate the mass exponents tau(q) and to explore the multifractal behavior of com...

  4. Cosmic microwave background and inflation in multi-fractional spacetimes

    CERN Document Server

    Calcagni, Gianluca; Tsujikawa, Shinji

    2016-01-01

    We use FIRAS and Planck 2015 data to place observational bounds on inflationary scenarios in multi-fractional spacetimes with $q$-derivatives. While a power-law expansion in the geometric time coordinate is subject to the usual constraints from the tensor-to-scalar ratio, model-independent best fits of the black-body and scalar spectra yield upper limits on the free parameters of the multi-fractal measure of the theory. When the measure describing the fractal spacetime geometry is non-oscillating, then information on the CMB black-body spectrum places constraints on the theory independent from but weaker than those obtained from the Standard Model, astrophysical gravitational waves and gamma-ray bursts (GRBs). When log oscillations are included and the measure describes a discrete fractal spacetime at microscopic scales, we obtain the first observational constraints on the amplitudes of such oscillations and find, in general, strong constraints on the multi-scale geometry and on the dimension of space. These ...

  5. Cosmic microwave background and inflation in multi-fractional spacetimes

    Energy Technology Data Exchange (ETDEWEB)

    Calcagni, Gianluca [Instituto de Estructura de la Materia,CSIC, Serrano 121, 28006 Madrid (Spain); Kuroyanagi, Sachiko [Department of Physics, Nagoya University,Chikusa, Nagoya 464-8602 (Japan); Institute for Advanced Research, Nagoya University,Chikusa, Nagoya 464-8602 (Japan); Tsujikawa, Shinji [Department of Physics, Faculty of Science, Tokyo University of Science,1-3, Kagurazaka, Shinjuku-ku, Tokyo 162-8601 (Japan)

    2016-08-18

    We use FIRAS and Planck 2015 data to place observational bounds on inflationary scenarios in multi-fractional spacetimes with q-derivatives. While a power-law expansion in the geometric time coordinate is subject to the usual constraints from the tensor-to-scalar ratio, model-independent best fits of the black-body and scalar spectra yield upper limits on the free parameters of the multi-fractal measure of the theory. When the measure describing the fractal spacetime geometry is non-oscillating, information on the CMB black-body spectrum places constraints on the theory independent from but weaker than those obtained from the Standard Model, astrophysical gravitational waves and gamma-ray bursts (GRBs). When log oscillations are included and the measure describes a discrete fractal spacetime at microscopic scales, we obtain the first observational constraints on the amplitudes of such oscillations and find, in general, strong constraints on the multi-scale geometry and on the dimension of space. These results complete the scan and reduction of the parameter space of the theory. Black-body bounds are obtained also for the theory with weighted derivatives.

  6. Multifractality and value-at-risk forecasting of exchange rates

    Science.gov (United States)

    Batten, Jonathan A.; Kinateder, Harald; Wagner, Niklas

    2014-05-01

    This paper addresses market risk prediction for high frequency foreign exchange rates under nonlinear risk scaling behaviour. We use a modified version of the multifractal model of asset returns (MMAR) where trading time is represented by the series of volume ticks. Our dataset consists of 138,418 5-min round-the-clock observations of EUR/USD spot quotes and trading ticks during the period January 5, 2006 to December 31, 2007. Considering fat-tails, long-range dependence as well as scale inconsistency with the MMAR, we derive out-of-sample value-at-risk (VaR) forecasts and compare our approach to historical simulation as well as a benchmark GARCH(1,1) location-scale VaR model. Our findings underline that the multifractal properties in EUR/USD returns in fact have notable risk management implications. The MMAR approach is a parsimonious model which produces admissible VaR forecasts at the 12-h forecast horizon. For the daily horizon, the MMAR outperforms both alternatives based on conditional as well as unconditional coverage statistics.

  7. Multifractality in dilute magnetorheological fluids under an oscillating magnetic field.

    Science.gov (United States)

    Moctezuma, R E; Arauz-Lara, J L; Donado, F

    2014-12-01

    A study of the multifractal characteristics of the structure formed by magnetic particles in a dilute magnetorheological fluid is presented. A quasi-two-dimensional magnetorheological fluid sample is simultaneously subjected to a static magnetic field and a sinusoidal magnetic field transverse to each other. We analyzed the singularity spectrum f(α) and the generalized dimension D(q) of the whole structure to characterize the distribution of the aggregates under several conditions of particle concentration, magnetic field intensities, and liquid viscosity. We also obtained the fractal dimension D(g), calculated from the radius of gyration of the chains, to describe the internal distribution of the particles. We present a thermodynamic interpretation of the multifractal analysis, and based on this, we discussed the characteristics of the structure formed by the particles and its relation with previous studies of the average chain length. We have found that this method is useful to quantitatively describe the structure of magnetorheological fluids, especially in systems with high particle concentration where the aggregates are more complex than simple chains or columns.

  8. ABC of multi-fractal spacetimes and fractional sea turtles

    Science.gov (United States)

    Calcagni, Gianluca

    2016-04-01

    We clarify what it means to have a spacetime fractal geometry in quantum gravity and show that its properties differ from those of usual fractals. A weak and a strong definition of multi-scale and multi-fractal spacetimes are given together with a sketch of the landscape of multi-scale theories of gravitation. Then, in the context of the fractional theory with q-derivatives, we explore the consequences of living in a multi-fractal spacetime. To illustrate the behavior of a non-relativistic body, we take the entertaining example of a sea turtle. We show that, when only the time direction is fractal, sea turtles swim at a faster speed than in an ordinary world, while they swim at a slower speed if only the spatial directions are fractal. The latter type of geometry is the one most commonly found in quantum gravity. For time-like fractals, relativistic objects can exceed the speed of light, but strongly so only if their size is smaller than the range of particle-physics interactions. We also find new results about log-oscillating measures, the measure presentation and their role in physical observations and in future extensions to nowhere-differentiable stochastic spacetimes.

  9. ABC of multi-fractal spacetimes and fractional sea turtles

    CERN Document Server

    Calcagni, Gianluca

    2016-01-01

    We clarify what it means to have a spacetime fractal geometry in quantum gravity and show that its properties differ from those of usual fractals. A weak and a strong definition of multi-scale and multi-fractal spacetimes are given together with a sketch of the landscape of multi-scale theories of gravitation. Then, in the context of the fractional theory with $q$-derivatives, we explore the consequences of living in a multi-fractal spacetime. To illustrate the behaviour of a non-relativistic body, we take the entertaining example of a sea turtle. We show that, when only the time direction is fractal, sea turtles swim at a faster speed than in an ordinary world, while they swim at a slower speed if only the spatial directions are fractal. The latter type of geometry is the one most commonly found in quantum gravity. For time-like fractals, relativistic objects can exceed the speed of light, but strongly so only if their size is smaller than the range of particle-physics interactions. We also find new results ...

  10. Spatial Characterization of Landscapes through Multifractal Analysis of DEM

    Directory of Open Access Journals (Sweden)

    P. L. Aguado

    2014-01-01

    Full Text Available Landscape evolution is driven by abiotic, biotic, and anthropic factors. The interactions among these factors and their influence at different scales create a complex dynamic. Landscapes have been shown to exhibit numerous scaling laws, from Horton’s laws to more sophisticated scaling of heights in topography and river network topology. This scaling and multiscaling analysis has the potential to characterise the landscape in terms of the statistical signature of the measure selected. The study zone is a matrix obtained from a digital elevation model (DEM (map 10 × 10 m, and height 1 m that corresponds to homogeneous region with respect to soil characteristics and climatology known as “Monte El Pardo” although the water level of a reservoir and the topography play a main role on its organization and evolution. We have investigated whether the multifractal analysis of a DEM shows common features that can be used to reveal the underlying patterns and information associated with the landscape of the DEM mapping and studied the influence of the water level of the reservoir on the applied analysis. The results show that the use of the multifractal approach with mean absolute gradient data is a useful tool for analysing the topography represented by the DEM.

  11. Cosmic microwave background and inflation in multi-fractional spacetimes

    Science.gov (United States)

    Calcagni, Gianluca; Kuroyanagi, Sachiko; Tsujikawa, Shinji

    2016-08-01

    We use FIRAS and PLANCK 2015 data to place observational bounds on inflationary scenarios in multi-fractional spacetimes with q-derivatives. While a power-law expansion in the geometric time coordinate is subject to the usual constraints from the tensor-to-scalar ratio, model-independent best fits of the black-body and scalar spectra yield upper limits on the free parameters of the multi-fractal measure of the theory. When the measure describing the fractal spacetime geometry is non-oscillating, information on the CMB black-body spectrum places constraints on the theory independent from but weaker than those obtained from the Standard Model, astrophysical gravitational waves and gamma-ray bursts (GRBs). When log oscillations are included and the measure describes a discrete fractal spacetime at microscopic scales, we obtain the first observational constraints on the amplitudes of such oscillations and find, in general, strong constraints on the multi-scale geometry and on the dimension of space. These results complete the scan and reduction of the parameter space of the theory. Black-body bounds are obtained also for the theory with weighted derivatives.

  12. Defining Urban and Rural Regions by Multifractal Spectrums of Urbanization

    Science.gov (United States)

    Chen, Yanguang

    2016-03-01

    The spatial pattern of the urban-rural regional system is associated with the dynamic process of urbanization. How to characterize the urban-rural terrain using quantitative measurement is a difficult problem remaining to be solved. This paper is devoted to defining urban and rural regions using ideas from fractals. A basic postulate is that human geographical systems are of self-similar patterns correlated with recursive processes. Then multifractal geometry can be employed to describe or define the urban and rural terrain with the level of urbanization. A space-filling index of urban-rural region based on a generalized correlation dimension is presented to reflect the degree of geo-spatial utilization in terms of urbanism. The census data of America and China are used to show how to make empirical analyses of urban-rural multifractals. This work is a normative study rather than a positive study, and it proposes a new way of investigating urban and rural regional systems using fractal theory.

  13. SOCIOECONOMIC AND CULTURAL FACTORS OF LOW SHOLASTIC ACHIEVEMENT OF ROMA CHILDREN

    Directory of Open Access Journals (Sweden)

    Snezana Tovilovic

    2009-09-01

    Full Text Available This study investigated environmental influences on scholastic achievement of first-grade elementary school students. A total of 149 (average age 81 months first-grade children were classified in three groups. The first group comprised of 52 Roma children. Two other groups consisted of 48 non-Roma children classified as children belonging to an average socioeconomic status (SES group and 49 non-Roma children classified as children belonging to a below-average SES group. All 52 Roma children belonged to a below-average SES group. Children’s intellectual abilities were assessed by Test of School Maturity; their scholastic achievement was assessed by teachers, while data on SES and family’s educational climate were obtained through a semi structured interview with their parents. Intellectual abilities – strongly influenced by family’s SES and family’s educational climate – were most predictive of scholastic achievement. Our structural model suggests that family’s educational climate, defined by unfavorable educational stimulation and low parents’ ambition concerning education of their children, moderates effects of low SES on inferior scholastic achievement. This model may be especially relevant for Roma children, since Roma children are most affected by the lack of adequate educational climate within their families.

  14. Prevalence of metabolic syndrome among Roma: a comparative health examination survey in Hungary.

    Science.gov (United States)

    Kósa, Zsigmond; Moravcsik-Kornyicki, Ágota; Diószegi, Judit; Roberts, Bayard; Szabó, Zoltán; Sándor, János; Ádány, Róza

    2015-04-01

    The objective of our study was to compare the health status of the Roma people with that of the general population in Hungary. A health examination survey to define the prevalence of metabolic syndrome and its components was performed in a representative random sample (n = 646) of the Roma population aged 20-64 years living in segregated colonies, and data were compared with that obtained in a representative random sample (n = 1819) of the Hungarian population. The risks for central obesity, hypertension and raised triglyceride level among Roma adults were not different from the Hungarian references, while raised fasting plasma glucose or known type 2 diabetes mellitus (OR = 2.65, 95%CI 1.90-3.69), reduced HDL cholesterol level or treated lipid disorder (OR = 2.15, 95%CI 1.65-2.79) were significantly more frequent in all age groups in the Roma sample. The prevalence of metabolic syndrome (OR = 1.37, 95%CI 1.03-1.83) was also significantly higher among Roma than in the general Hungarian population. Besides tackling the socio-economic determinants of the poor health of Roma people, specific public health interventions considering increased genetic susceptibility to metabolic disturbances are needed to improve their health status. © The Author 2014. Published by Oxford University Press on behalf of the European Public Health Association. All rights reserved.

  15. The Role of the Union in Integrating the Roma: Present and Possible Future

    Directory of Open Access Journals (Sweden)

    Annelies Verstichel

    2005-08-01

    Full Text Available The paper describes the important contribution Council Directive 2000/43/EC of29 June 2000 implementing the principle of equal treatment between personsirrespective of racial or ethnic origin has made to improve the situation of theRoma in the Union. It also highlights, however, the insufficiencies of thatinstrument, when confronted to the specific needs of the Roma and to theirsituation in the Union. The paper therefore suggests that Article 13(1 EC couldbe relied upon by the European legislator either to improve further on thatDirective, for instance in order to extend its scope of application to the deliveryof administrative documents, in order to explicitly include segregation as a formof prohibited discrimination, or in order to adopt another instrument,complementary to the Racial Equality Directive, addressing in a more focusedmanner the specific needs of the Roma, while remaining attentive to thepreservation of their traditional lifestyle for those wishing not to renounce it,and ensuring that such a measure is based on a consultation of the Romathemselves. Article 13(2 EC could be relied upon to encourage the MemberStates to share the best practices they are developing in order to accelerate theintegration of the Roma, and to monitor, better and more systematically thanthey do at present, the situation of the Roma in fields such as housing,education, employment, or health care, where the Roma are not specificallyconsidered in the national action plans or the social inclusion plans of mostMember States at present.

  16. Extreme differences in SLCO1B3 functional polymorphisms in Roma and Hungarian populations.

    Science.gov (United States)

    Nagy, Agnes; Szalai, Renata; Magyari, Lili; Bene, Judit; Toth, Kalman; Melegh, Bela

    2015-05-01

    Variants in SLCO1B3 transporter are linked to disposition and uptake of drugs and show high degree of heterogeneity between populations. A total of 467 Roma and 448 Hungarian subjects were genotyped for SLCO1B3 c.334T>G and c.1683-5676A>G variant alleles by PCR-RFLP assay and direct sequencing. We found significant differences in the frequencies of homozygous variant genotypes of SLCO1B3 334GG (41.54% vs. 8.04%, pRomas and Hungarians. A significantly increased prevalence was found in SLCO1B3 1683-5676G allele frequency in Hungarians compared to the Roma population (15.07% vs. 3.43%, p≤0.001). The frequency of SLCO1B3 334G allele was significantly increased in Roma population compared to Hungarians (70.56% vs. 52.23%, p=0.001). The LD values between the examined SNPs were 80 and 90 in Roma and in Hungarian samples, respectively. Our results highlight notable pharmacogenetic differences between Roma and Hungarian populations, which may have therapeutic implications.

  17. Intergenerational transmission of ethnic identity and life satisfaction of Roma minority adolescents and their parents.

    Science.gov (United States)

    Dimitrova, Radosveta; Ferrer-Wreder, Laura; Trost, Kari

    2015-12-01

    This study investigates intergeneration transmission of ethnic identity as a resource for life satisfaction of Roma adolescents and their parents. Historically, Roma represent the largest ethnic minority in Europe. They have been exposed to severe discrimination, social exclusion, and poverty. Therefore, identifying resources for their life satisfaction is theoretically and practically important. The present study included 1093 participants, of which there were 171 Roma adolescents (age: M = 14.96 years, SD = 1.85), 155 mothers (age: M = 36.16 years, SD = 5.77) and 123 fathers (age: M = 39.68 years, SD = 6.06). Further, a comparison group of 248 mainstream adolescents with their mothers (n = 221) and fathers (n = 175) was also included in the study. Adolescents and their parents provided data on ethnic identity (MEIM; Phinney, 1992) and life satisfaction (SWLS; Diener, Emmons, Larsen, & Griffin, 1985). Results indicated that Roma youth were lower on endorsement of ethnic identity and average on life satisfaction compared to their mainstream peers. A structural equation model showed that ethnic identity was a positive predictor of life satisfaction for both adolescents and their Roma parents. Furthermore, parents' ethnic identity was a predictor of adolescent life satisfaction. We concluded that for Roma youth and their parents, ethnic identity represents a salient source for life satisfaction and an intergenerational continuity of identity and life satisfaction exists.

  18. Healthier lives for European minority groups: school and health care, lessons from the Roma.

    Science.gov (United States)

    Flecha, Ainhoa

    2013-07-24

    On average, the Roma in Europe can expect to die 10 years earlier than the rest of the population, given the health conditions they experience. EU-funded research has informed on successful actions (SA) that when implemented among the Roma provide them new forms of educational participation which have a direct impact on improving their health status, regardless of their educational level. The findings from this research, unanimously endorsed by the European Parliament, have been included in several European Union recommendations and resolutions as part of the EU strategy on Roma inclusion. To analyze these SA, as well as the conditions that promote them and their impact on reducing health inequalities, communicative fieldwork has been conducted with Roma people from a deprived neighbourhood in the South of Spain, who are participating in the previously identified SA. The analysis reveals that these SA enable Roma people to reinforce and enrich specific strategies like improving family cohesion and strengthening their identity, which allow them to improve their overall health. These findings may inform public policies to improve the health condition of the Roma and other vulnerable groups, one goal of the Europe 2020 strategy for a healthier Europe.

  19. ROMA: representation and quantification of module activity from target expression data

    Directory of Open Access Journals (Sweden)

    Loredana eMartignetti

    2016-02-01

    Full Text Available In many analysis of high-throughput data in systems biology, there is a need to quantify the activity of a set of genes in individual samples. A typical example is the case where it is necessary to estimate the activity of a transcription factor (which is often not directly measurable from the expression of its target genes. We present here ROMA (Representation and quantification Of Module Activities Java software, designed for fast and robust computation of the activity of gene sets (or modules with coordinated expression. ROMA activity quantification is based on the simplest uni-factor linear model of gene regulation that approximates the expression data of a gene set by its first principal component.The proposed algorithm implements novel functionalities: it provides several method modifications for principal components computation, including weighted, robust and centered methods; it distinguishes overdispersed modules (based on the variance explained by the first principal component and coordinated modules (based on the significance of the spectral gap; finally, it computes statistical significance of the estimated module overdispersion or coordination.ROMA can be applied in many contexts, from estimating differential activities of transcriptional factors to findingoverdispersed pathways in single-cell transcriptomics data. We describe here the principles of ROMA providing several practical examples of its use.ROMA source code is available at https://github.com/sysbio-curie/Roma.

  20. Neuropsicologia, le novità dal congresso Sinp di Roma

    Directory of Open Access Journals (Sweden)

    Marco Mozzoni

    2012-12-01

    Full Text Available Tutte le novità su mente e cervello dal congresso annuale della Società Italiana di Neuropsicologia (Sinp 2012 tenutosi lo scorso Novembre presso la Fondazione Santa Lucia di Roma presentate su BrainFactor in uno "speciale" realizzato dagli studenti del Laboratorio di Comunicazione giornalistica dell'Università degli Studi di Milano Bicocca. Memoria, percezione, linguaggio, semantica, afasie, sclerosi multipla, disordini di coscienza, stato vegetativo, stato di minima coscienza, Alzheimer, demenze, distubi cognitivi in età evolutiva, brain computer interface (Bci, esoscheletri, elettroencefalografia, potenziali evocati, riabilitazione cognitiva dei pazienti cerebrolesi, neuroimgaing, neurofisiologia, neglect, dislessia, operazioni di calcolo, riconoscimento dei volti e degli oggetti, deficit attentivi, stimolazione magnetica transcranica, adattamento prismatico, blindsight, sé corporeo...