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https://www.readbyqxmd.com/read/27921231/the-cell-and-protoplasm-as-container-object-and-substance-1835-1861
#1
Daniel Liu
This article revisits the development of the protoplasm concept as it originally arose from critiques of the cell theory, and examines how the term "protoplasm" transformed from a botanical term of art in the 1840s to the so-called "living substance" and "the physical basis of life" two decades later. I show that there were two major shifts in biological materialism that needed to occur before protoplasm theory could be elevated to have equal status with cell theory in the nineteenth century. First, I argue that biologists had to accept that life could inhere in matter alone, regardless of form...
December 5, 2016: Journal of the History of Biology
https://www.readbyqxmd.com/read/27921111/rapid-detection-of-hendra-virus-antibodies-an-integrated-device-with-nanoparticle-assay-and-chaotic-micromixing
#2
K Petkovic, G Metcalfe, H Chen, Y Gao, M Best, D Lester, Y Zhu
Current diagnosis of infectious diseases such as Hendra virus (HeV) relies mostly on laboratory-based tests. There is an urgent demand for rapid diagnosis technology to detect and identify these diseases in humans and animals so that disease spread can be controlled. In this study, an integrated lab-on-a-chip device using a magnetic nanoparticle immunoassay is developed. The key features of the device are the chaotic fluid mixing, achieved by magnetically driven motion of nanoparticles with the optimal mixing protocol developed using chaotic transport theory, and the automatic liquid handling system for loading reagents and samples...
December 6, 2016: Lab on a Chip
https://www.readbyqxmd.com/read/27916755/-the-nomenclature-and-classification-of-sporadic-spinocerebellar-degeneration
#3
Shunsuke Koga
Spinocerebellar degeneration (SCD) is a neurodegenerative disease characterized by progressive cerebellar ataxia. SCD has a wide range of clinical, pathological, and genetic features, including whether the disease is sporadic or hereditary, and whether it manifests as purely cerebellar or affects multiple systems. Therefore, the classification of SCD has been complicated and has changed over time. Recent advances in genetic testing have shed light on the classification of hereditary SCD. In contrast, the classification of sporadic SCD remains chaotic and there exist nomenclature discrepancies in sporadic SCD between Japanese and English literature...
December 2016: Brain and Nerve, Shinkei Kenkyū No Shinpo
https://www.readbyqxmd.com/read/27914440/computational-study-of-the-piccolo-evidence-for-chaotic-tones
#4
N Giordano
Direct numerical solutions of the Navier-Stokes equations have been used to compute tones produced by a model of the piccolo. The behavior depends on the angle at which the air jet is directed at the embouchure hole and the displacement of the jet center from the embouchure edge. Values of the jet angle and displacement are found that produce pure tones with spectra similar to those of real piccolo tones. The behavior of calculated tones as a function of the blowing speed u is studied, and it is found that unsteady behavior can occur depending on the value of u, the jet angle, and the jet displacement...
September 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27913339/a-parametric-study-for-the-design-of-an-optimized-ultrasonic-percussive-planetary-drill-tool
#5
Xuan Li, Patrick Harkness, Kevin Worrall, Ryan Timoney, Margaret Lucas
Traditional rotary drilling for planetary rock sampling, in-situ analysis and sample return, is challenging because the axial force and holding torque requirements are not necessarily compatible with lightweight spacecraft architectures in low-gravity environments. This article seeks to optimize an ultrasonic-percussive drill tool to achieve rock penetration with lower reacted force requirements, with a strategic view towards building an Ultrasonic Planetary Core Drill (UPCD) device. The UPCD is a descendant of the Ultrasonic/Sonic Driller/Corer (USDC) technique...
November 29, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/27912748/challenges-to-access-and-provision-of-palliative-care-for-people-who-are-homeless-a-systematic-review-of-qualitative-research
#6
Briony F Hudson, Kate Flemming, Caroline Shulman, Bridget Candy
BACKGROUND: People who are homeless or vulnerably housed are a marginalized group who often experience high rates of morbidity and die young as a result of complex problems. Access to health care and support can be challenging, with access to palliative care even more so. This review presents a synthesis of published qualitative research exploring from the perspective of homeless people and those working to support them, current challenges to palliative care access and provision, in addition to suggestions for what may improve palliative care for this population...
December 3, 2016: BMC Palliative Care
https://www.readbyqxmd.com/read/27910863/compressive-sensing-with-optical-chaos
#7
D Rontani, D Choi, C-Y Chang, A Locquet, D S Citrin
Compressive sensing (CS) is a technique to sample a sparse signal below the Nyquist-Shannon limit, yet still enabling its reconstruction. As such, CS permits an extremely parsimonious way to store and transmit large and important classes of signals and images that would be far more data intensive should they be sampled following the prescription of the Nyquist-Shannon theorem. CS has found applications as diverse as seismology and biomedical imaging. In this work, we use actual optical signals generated from temporal intensity chaos from external-cavity semiconductor lasers (ECSL) to construct the sensing matrix that is employed to compress a sparse signal...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27909390/child-welfare-involved-parents-and-pathways-triple-p-perceptions-of-program-acceptability-and-appropriateness
#8
Ericka M Lewis, Megan Feely, Kristen D Seay, Nicole Fedoravicis, Patricia L Kohl
Nearly half of children in the child welfare system have clinically significant behavior problems and are at risk of developing disruptive behavioral disorders. Yet, behavioral parent training interventions, which are the most effective way to treat these problems, are rarely provided to child welfare involved families. As a result, little is known about the acceptability and appropriateness of these parent training interventions with these families. This qualitative study explored implementation outcomes of an evidenced-based parenting intervention, Pathways Triple P, with families in the child welfare system...
December 2016: Journal of Child and Family Studies
https://www.readbyqxmd.com/read/27908021/finding-equilibrium-in-the-spatiotemporal-chaos-of-the-complex-ginzburg-landau-equation
#9
Christopher C Ballard, C Clark Esty, David A Egolf
Equilibrium statistical mechanics allows the prediction of collective behaviors of large numbers of interacting objects from just a few system-wide properties; however, a similar theory does not exist for far-from-equilibrium systems exhibiting complex spatial and temporal behavior. We propose a method for predicting behaviors in a broad class of such systems and apply these ideas to an archetypal example, the spatiotemporal chaotic 1D complex Ginzburg-Landau equation in the defect chaos regime. Building on the ideas of Ruelle and of Cross and Hohenberg that a spatiotemporal chaotic system can be considered a collection of weakly interacting dynamical units of a characteristic size, the chaotic length scale, we identify underlying, mesoscale, chaotic units and effective interaction potentials between them...
November 2016: Chaos
https://www.readbyqxmd.com/read/27908019/a-chaotic-model-for-the-epidemic-of-ebola-virus-disease-in-west-africa-2013-2016
#10
Sylvain Mangiarotti, Marisa Peyre, Mireille Huc
An epidemic of Ebola Virus Disease (EVD) broke out in Guinea in December 2013. It was only identified in March 2014 while it had already spread out in Liberia and Sierra Leone. The spill over of the disease became uncontrollable and the epidemic could not be stopped before 2016. The time evolution of this epidemic is revisited here with the global modeling technique which was designed to obtain the deterministic models from single time series. A generalized formulation of this technique for multivariate time series is introduced...
November 2016: Chaos
https://www.readbyqxmd.com/read/27908018/dynamics-and-transport-properties-of-three-surface-quasigeostrophic-point-vortices
#11
C K Taylor, Stefan G Llewellyn Smith
The surface quasi-geostrophic (SQG) equations are a model for low-Rossby number geophysical flows in which the dynamics are governed by potential temperature dynamics on the boundary. We examine point vortex solutions to this model as well as the chaotic flows induced by three point vortices. The chaotic transport induced by these flows is investigated using techniques of Poincaré maps and the Finite Time Braiding Exponent (FTBE). This chaotic transport is representative of the mixing in the flow, and these terms are used interchangeably in this work...
November 2016: Chaos
https://www.readbyqxmd.com/read/27908017/symmetry-restoring-bifurcations-and-quasiperiodic-chaos-induced-by-a-new-intermittency-in-a-vibro-impact-system
#12
Yuan Yue, Pengcheng Miao, Jianhua Xie, Grebogi Celso
Quasiperiodic chaos (QC), which is a combination of quasiperiodic sets and a chaotic set, is uncovered in the six dimensional Poincaré map of a symmetric three-degree of freedom vibro-impact system. Accompanied by symmetry restoring bifurcation, this QC is the consequence of a novel intermittency that occurs between two conjugate quasiperiodic sets and a chaotic set. The six dimensional Poincaré map P is the 2-fold composition of another virtual implicit map Q, yielding the symmetry of the system. Map Q can capture two conjugate attractors, which is at the core of the dynamics of the vibro-impact system...
November 2016: Chaos
https://www.readbyqxmd.com/read/27908013/oscillation-quenching-in-third-order-phase-locked-loop-coupled-by-mean-field-diffusive-coupling
#13
S Chakraborty, M Dandapathak, B C Sarkar
We explored analytically the oscillation quenching phenomena (amplitude death and parameter dependent inhomogeneous steady state) in a coupled third order phase locked loop (PLL) both in periodic and chaotic mode. The phase locked loops were coupled through mean field diffusive coupling. The lower and upper limits of the quenched state were identified in the parameter space of the coupled PLL using the Routh-Hurwitz technique. We further observed that the ability of convergence to the quenched state of coupled PLLs depends on the design parameters...
November 2016: Chaos
https://www.readbyqxmd.com/read/27908006/generation-and-dynamics-analysis-of-n-scrolls-existence-in-new-translation-type-chaotic-systems
#14
Yue Liu, Shuxu Guo
In this paper, we propose two kinds of translation type chaotic systems for creating 2 N + 1-and 2(N + 1)-scrolls chaotic attractors from a simple three-dimensional system, which are named the translation-2 chaotic system (a12a21 < 0) and the translation-3 chaotic system (a12a21 > 0). We also propose the successful design criterion for constructing 2 N + 1-and 2(N + 1)-scrolls, respectively. Then, the dynamics property of the translation-2 chaotic system is studied in detail...
November 2016: Chaos
https://www.readbyqxmd.com/read/27908005/occurrence-and-stability-of-chimera-states-in-coupled-externally-excited-oscillators
#15
Dawid Dudkowski, Yuri Maistrenko, Tomasz Kapitaniak
We studied the phenomenon of chimera states in networks of non-locally coupled externally excited oscillators. Units of the considered networks are bi-stable, having two co-existing attractors of different types (chaotic and periodic). The occurrence of chimeras is discussed, and the influence of coupling radius and coupling strength on their co-existence is analyzed (including typical bifurcation scenarios). We present a statistical analysis and investigate sensitivity of the probability of observing chimeras to the initial conditions and parameter values...
November 2016: Chaos
https://www.readbyqxmd.com/read/27908003/resonance-phenomena-in-a-two-layer-two-vortex-shear-flow
#16
Eugene A Ryzhov, Konstantin V Koshel
The paper deals with a dynamical system governing the motion of two point vortices embedded in the bottom layer of a two-layer rotating flow experiencing linear deformation and their influence on fluid particle advection. The linear deformation consists of shear and rotational components. If the deformation is stationary, the vortices can move periodically in a bounded region. The vortex periodic motion induces stirring patterns of passive fluid particles in the both layers. We focus our attention on the upper layer where the bottom-layer singular point vortices induce a regular velocity field with no singularities...
November 2016: Chaos
https://www.readbyqxmd.com/read/27908001/interaction-between-synchronization-and-motion-in-a-system-of-mobile-agents
#17
Arturo Buscarino, Luigi Fortuna, Mattia Frasca, Salvatore Frisenna
In this paper, we study synchronization in time-varying networks inherited by the Vicsek's model of self-propelled particles. In our model, each particle/agent moves in a two dimensional space according to the Vicsek's rules and is associated to a chaotic system. The dynamics of two oscillators are coupled with each other only when agents are at a distance less than an interaction radius. We investigate the system behavior with respect to some fundamental parameters, and, in particular, to the noise level, which for increasing intensity drives the system from an ordered motion to a disordered one...
November 2016: Chaos
https://www.readbyqxmd.com/read/27907998/synchronization-and-local-convergence-analysis-of-networks-with-dynamic-diffusive-coupling
#18
Daniel Alberto Burbano Lombana, Mario di Bernardo
In this paper, we address the problem of achieving synchronization in networks of nonlinear units coupled by dynamic diffusive terms. We present two types of couplings consisting of a static linear term, corresponding to the diffusive coupling, and a dynamic term which can be either the integral or the derivative of the sum of the mismatches between the states of neighbouring agents. The resulting dynamic coupling strategy is a distributed proportional-integral (PI) or a proportional-derivative (PD) law that is shown to be effective in improving the network synchronization performance, for example, when the dynamics at nodes are nonidentical...
November 2016: Chaos
https://www.readbyqxmd.com/read/27907100/patterns-of-fish-connectivity-between-a-marine-protected-area-and-surrounding-fished-areas
#19
Rita Sahyoun, Paolo Guidetti, Antonio Di Franco, Serge Planes
Patterns of connectivity and self-recruitment are recognized as key factors shaping the dynamics of marine populations. Connectivity is also essential for maintaining and restoring natural ecological processes with genetic diversity contributing to the adaptation and persistence of any species in the face of global disturbances. Estimates of connectivity are crucial to inform the design of both marine protected areas (MPAs) and MPA networks. Among several approaches, genetic structure is frequently used as a proxy for patterns of connectivity...
2016: PloS One
https://www.readbyqxmd.com/read/27906393/geometric-control-of-active-collective-motion
#20
Maxime Theillard, Roberto Alonso-Matilla, David Saintillan
Recent experimental studies have shown that confinement can profoundly affect self-organization in semi-dilute active suspensions, leading to striking features such as the formation of steady and spontaneous vortices in circular domains and the emergence of unidirectional pumping motions in periodic racetrack geometries. Motivated by these findings, we analyze the two-dimensional dynamics in confined suspensions of active self-propelled swimmers using a mean-field kinetic theory where conservation equations for the particle configurations are coupled to the forced Navier-Stokes equations for the self-generated fluid flow...
December 1, 2016: Soft Matter
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