BibSonomy publications for /tag/physicsThu Sep 04 14:52:17 CEST 2008JOURNAL OF GEOPHYSICAL RESEARCHFractal properties of isolines at varying altitude revealing different dominant geological processes on Earth 1132008isoline geomorphology statistics myown fractals fracal physics geophysics 2008 Geometrical properties of landscapes result from the geological processes that have acted through time. The quantitative analysis of natural relief represents an objective form of aiding in the visual interpretation of landscapes, as studies on coastlines, river networks, and global topography, have shown. Still, an open question is whether a clear relationship between the quantitative properties of landscapes and the dominant geomorphologic processes that originate them can be established. In this contribution, we show that the geometry of topographic isolines is an appropriate observable to help disentangle such a relationship. A fractal analysis of terrestrial isolines yields a clear identification of trenches and abyssal plains, differentiates oceanic ridges from continental slopes and platforms, localizes coastlines and river systems, and isolates areas at high elevation (or latitude) subjected to the erosive action of ice. The study of the geometrical properties of the lunar landscape supports the existence of a correspondence between principal geomorphic processes and landforms. Our analysis can be easily applied to other planetary bodies.Tue Aug 12 09:50:13 CEST 2008{The whole group of proper motions of the Minkowski metric in an arbitrary dimension space}2008physics imported SpecialRelativity It is shown that the Poincare group which is a semidirect product of the group of translations and the Lorentz group, is not the whole group of proper motions of Minkowski metric. There has been found the complementary group of proper motions of the metric in a class of noninertial reference system.Tue Jul 22 16:25:15 CEST 2008Journal of Physics: Condensed Matter24S2405-S2428What is the temperature of a granular medium?172005myown imported fdt granular gases 2005 maxwell temperature physics In this paper we discuss whether thermodynamical concepts and in particular the notion of temperature could be relevant for the dynamics of granular systems. We briefly review how a temperature-like quantity can be defined and measured in granular media in very different regimes, namely the glassy-like, the liquid-like and the granular gas. The common denominator will be given by the fluctuation\–dissipation theorem, whose validity is explored by means of both numerical and experimental techniques. It turns out that, although a definition of a temperature is possible in all cases, its interpretation is far from being obvious. We discuss the possible perspectives both from the theoretical and, more importantly, from the experimental point of view. Fri Jun 20 12:33:08 CEST 2008Reviews of Modern PhysicsxxxxxxStatistical physics of social dynamicsxx2008dynamics loreto 2007 opinion physics culture tagorapub social castellano fortunato language RMP_CFL crowd Statistical physics has proven to be a very fruitful framework to describe phenomena outside the realm of traditional physics. The last years have witnessed the attempt by physicists to study collective phenomena emerging from the interactions of individuals as elementary units in social structures. Here we review the state of the art by focusing on three major research lines i.e., opinion, cultural and language dynamics. In addition we discuss other social phenomena, such as crowd behavior, hierarchy formation, human dynamics, social spreading. We highlight the connections between these problems and other, more traditional, topics of statistical physics. We also emphasize the comparison of model results with empirical data from social systems.Thu Jun 19 17:46:40 CEST 2008IEEE Nuclear Science Symposium Conference Record23-29 October143--147High energy physics data analysis with gene expression programming12005programming, instrumentation algorithms, evolutionary energy Expression data physics analysis expression computing, Programming, algorithm, high genetic Gene gene analysis, Gene expression programming is a new evolutionary algorithm that overcomes many limitations of the more established genetic algorithms and genetic programming. Its first application to high energy physics data analysis is presented. The algorithm was successfully used for event selection on samples with both low and high background level. The signal/background classification accuracy was over 90percent in all cases.Fri May 30 05:56:46 CEST 2008Journal of Computer Assisted LearningApril2143-158Designing a programming-based approach for modelling scientific phenomena212005weblabs education collision mythesis 1d webreports ijceell06 physics constructionism ijtme2006 design ILE We describe an iteratively designed sequence of activities involving the modelling of one-dimensional collisions between moving objects based on programming in ToonTalk. Students aged 13–14 years in two settings (London and Cyprus) investigated a number of collision situations, classified into six classes based on the relative velocities and masses of the colliding objects. We describe iterations of the system in which students engaged in a repeating cycle of activity for each collision class: prediction of object behaviour from given collision conditions, observation of a relevant video clip, building a model to represent the phenomena, testing, validating and refining their model, and publishing it – together with comments – on our web-based collaboration system, WebReports. Students were encouraged to consider the limitations of their current model, with the aim that they would eventually appreciate the benefit of constructing a general model that would work for all collision classes, rather than a different model for each class. We describe how our intention to engage students with the underlying concepts of conservation, closed systems and system states was instantiated in the activity design, and how the modelling activities afforded an alternative representational framework to traditional algebraic description.Wed Apr 23 22:05:04 CEST 2008Journal of Statistical Planning and InferenceApr1-23--13Some remarks on arithmetic physics1032002physics Arithmetic 15Tue Apr 22 10:36:30 CEST 2008Physica A: Statistical Mechanics and its ApplicationsSep1-3418--426One- and two-component fluids: restrictions from the Second Law3402004continuum Weakly physics nonlocal 01Tue Apr 22 10:36:30 CEST 2008Physica A: Statistical Mechanics and its ApplicationsJul1-2255--260The distribution of low-variability periods in human heartbeat dynamics3382004medical Biological physics and 01Tue Apr 22 10:36:30 CEST 2008Physica A: Statistical Mechanics and its ApplicationsDec2-4551--574A macroscopic approach towards earthquake physics: the meaning of the apparent stress3582005physics Earthquake 15Tue Apr 22 10:36:30 CEST 2008Physica A: Statistical and Theoretical PhysicsSep1100--121Biological physics in four lectures and three applications3692006physics Biological 01Tue Apr 22 10:36:30 CEST 2008Physica A: Statistical Mechanics and its ApplicationsOct1-2153--187Traffic flow: a statistical physics point of view3132002Nonequilibrium physics 01Tue Apr 22 10:36:30 CEST 2008Physica A: Statistical Mechanics and its ApplicationsDec1142--150Cellular automata models of highway traffic3722006Nonequilibrium physics 01Tue Apr 22 10:36:30 CEST 2008Physica A: Statistical Mechanics and its ApplicationsJul3-4437--444Superstatistics from a different perspective3382004Statistical physics 15Tue Apr 22 10:36:30 CEST 2008Physica A: Statistical Mechanics and its ApplicationsDec1-4397--402Deviations from uniform power-law scaling due to exposure to high altitude3162002physics Biological 15Tue Apr 22 10:36:30 CEST 2008Physica A: Statistical Mechanics and its ApplicationsSep1-385--91A conceptual framework for the Wheeler program3402004physics Information 01Tue Apr 22 10:36:30 CEST 2008Physica A: Statistical Mechanics and its ApplicationsOct1-2126--131The need for alternative information measures3422004Information physics 15Tue Apr 22 10:36:30 CEST 2008Physica A: Statistical Mechanics and its ApplicationsSep2782--796Semiclassical information from deformed and escort information measures3832007Information physics 15Tue Apr 22 10:36:30 CEST 2008Physica A: Statistical Mechanics and its ApplicationsSep3-4458--469Wavelet analysis of blood pressure waves in vasovagal syncope2711999Medical physics 15Tue Apr 22 10:36:30 CEST 2008Physica A: Statistical Mechanics and its ApplicationsJul608--618An efficient organization mechanism for spatial networks3662006Statistical complex physics networks of 01physicsCommunity for tag(s) physics