Displaced dynamics of binary mixtures in linear and nonlinear optical lattices

The dynamical behavior of matter wave solitons of two-component Bose-Einstein condensates (BEC) in combined linear and nonlinear optical lattices (OLs) is investigated. In particular, the dependence of the frequency of the oscillating dynamics resulting from initially slightly displaced components is investigated both analytically, by means of a variational effective potential approach for the reduced collective coordinate dynamics of the soliton, and numerically, by direct integrations of the mean field equations of the BEC mixture. We show that for small initial displacements binary solitons can be viewed as point masses connected by elastic springs of strengths related to the amplitude of the OL and to the intra and inter-species interactions. Analytical expressions of symmetric and anti-symmetric mode frequencies, are derived and occurrence of beatings phenomena in the displaced dynamics is predicted. These expressions are shown to give a very good estimation of the oscillation frequencies for different values of the intra-species interatomic scattering length, as confirmed by direct numerical integrations of the mean field Gross-Pitaevskii equations (GPE) of the mixture. The possibility to use displaced dynamics for indirect measurements of BEC mixture characteristics such as number of atoms and interatomic interactions is also suggested.Comment: 8 pages, 21 figure

Scaling of NonOhmic Conduction in Strongly Correlated Systems

A new scaling formalism is used to analyze nonlinear I-V data in the vicinity of metal-insulator transitions (MIT) in five manganite systems. An exponent, called the nonlinearity exponent, and an onset field for nonlinearity, both characteristic of the system under study, are obtained from the analysis. The onset field is found to have an anomalously low value corroborating the theoretically predicted electronically soft phases. The scaling functions above and below the MIT of a polycrystalline sample are found to be the same but with different exponents which are attributed to the distribution of the MIT temperatures. The applicability of the scaling in manganites underlines the universal response of the disordered systems to electric field

The Reliability of a Rotational Power Assessment of the Core

Context: Most athletic upper-body power generation involveshigh levels of neuromuscular activation/coordination of a rotationalnature. Therefore, it is important to assess athletic ability thatreplicates the rotational activity of athletes. However, a paucity ofresearch currently measures rotational power of the core.Objective: Establish inter-day reliability of chop and lift mean poweroutput via a linear position transducer on rotational reliant powerathletes.Design: Controlled laboratory study.Setting: Professional cricket training facilities.Population: Eight male professional cricket players (age= 23±3.38years, height= 186±10.06 cm, mass= 89.71± 8.12 kg) with aresistance (>2 years) training background volunteered to participatein the study.Intervention: A linear position transducer was attached to theweight stack of a cable pulley system to determine the peak poweroutputs associated with a chop and lift movement. Assessmentoccurred on three occasions separated by at least seven days.Asymmetry, intraclass correlation coefficients (ICCs) and coefficientof variations (CV) were calculated and used to quantify the absoluteand relative consistency of the testing procedures.Results: The mean peak power outputs for chop and lift rangedfrom 404 - 494W and 277-314W respectively, the power outputsdiffering minimally (2.7-6.3%) between the left and right sides.Coefficients of variation of 7.4% - 19% were reported, with intraclass correlation coefficients of 0.54 - 0.94 observed betweentesting occasions.Conclusion: Mean muscular power output associated with the liftassessment reported greatest reliability in well trained athletes.The asymmetry between sides was relatively small suggestingbalanced multi-planar trunk development in the current throwingathletes. Equipment limitations (load related), training status andvariable selection (mean or peak power) need to be consideredprior to rotational assessment of the core.It is recommended that the lift movement is utilized in rotationalpower assessments, or that greater familiarization is undertakenwhen administering the chop assessment.KeywordsCore; Trunk; Assessment; Anaerobic; Transverse plan

Nonlinearity exponents in lightly doped Conducting Polymers

The \textit{I-V} characteristics of four conducting polymer systems like doped polypyrrole (PPy), poly 3,4 ethylene dioxythiophene (PEDOT), polydiacetylene (PDA) and polyaniline (PA) in as many physical forms have been investigated at different temperatures, quenched disorder and magnetic fields. Transport data clearly confirm the existence of a \textit{single} electric field scale in any system. Based upon this observation, a phenomenological scaling analysis is applied, leading to extraction of a concrete number $x_M$, called nonlinearity exponent. The latter serves to characterize a set of \textit{I-V} curves. The onset field $F_o$ at which conductivity starts deviating from its Ohmic value $\sigma_0$ scales as $F_o \sim \sigma_0^{x_M}$. Field-dependent data are shown to be described by Glatzman-Matveev multi-step tunneling model [JETP 67, 1276 (1988)] in a near-perfect manner over nine orders of magnitude in conductivity and five order of magnitudes in electric field. $x_M$ is found to possess both positive and negative values lying between -1/2 and 3/4. There is no theory at present for the exponent. Some issues concerning applicability of the Glatzman-Matveev model are discussed.Comment: 20 pages, 14 figure

Trapped ions in optical lattices for probing oscillator chain models

We show that a chain of trapped ions embedded in microtraps generated by an optical lattice can be used to study oscillator models related to dry friction and energy transport. Numerical calculations with realistic experimental parameters demonstrate that both static and dynamic properties of the ion chain change significantly as the optical lattice power is varied. Finally, we lay out an experimental scheme to use the spin degree of freedom to probe the phase space structure and quantum critical behavior of the ion chain

Multiagent cooperation for solving global optimization problems: an extendible framework with example cooperation strategies

This paper proposes the use of multiagent cooperation for solving global optimization problems through the introduction of a new multiagent environment, MANGO. The strength of the environment lays in itsflexible structure based on communicating software agents that attempt to solve a problem cooperatively. This structure allows the execution of a wide range of global optimization algorithms described as a set of interacting operations. At one extreme, MANGO welcomes an individual non-cooperating agent, which is basically the traditional way of solving a global optimization problem. At the other extreme, autonomous agents existing in the environment cooperate as they see fit during run time. We explain the development and communication tools provided in the environment as well as examples of agent realizations and cooperation scenarios. We also show how the multiagent structure is more effective than having a single nonlinear optimization algorithm with randomly selected initial points