keyword
MENU ▼
Read by QxMD icon Read
search

Nonlinear dynamics

keyword
https://www.readbyqxmd.com/read/29155562/quantification-of-nanomaterial-nanomedicine-trafficking-in-vivo
#1
Liming Wang, Liang Yan, Jing Liu, Chunying Chen, Yuliang Zhao
Absorption, distribution, metabolism and excretion (ADME) of nanomaterials (NMs) or nanomedicines (NMs), are fundamental biological processes that dominate their nanomedical functions or nanotoxicities. Mostly, NMs exist in biological systems as a form of nanoparticles (NPs). However, to determine the composition, spatial distribution, and states of existence of NMs/NPs in vivo, upon entry into the body, as well as to monitor the dynamic changes of these information over time remain a challenge for the current analytical methodology due to their limited efficiently in characterizing interactions between these complex(nano)-complex(bio) systems...
November 20, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29155024/linearization-improves-the-repeatability-of-quantitative-dynamic-contrast-enhanced-mri
#2
Kyle M Jones, Mark D Pagel, Julio Cárdenas-Rodríguez
PURPOSE: The purpose of this study was to compare the repeatabilities of the linear and nonlinear Tofts and reference region models (RRM) for dynamic contrast-enhanced MRI (DCE-MRI). MATERIALS AND METHODS: Simulated and experimental DCE-MRI data from 12 rats with a flank tumor of C6 glioma acquired over three consecutive days were analyzed using four quantitative and semi-quantitative DCE-MRI metrics. The quantitative methods used were: 1) linear Tofts model (LTM), 2) non-linear Tofts model (NTM), 3) linear RRM (LRRM), and 4) non-linear RRM (NRRM)...
November 15, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/29151573/mixing-instabilities-during-shearing-of-metals
#3
Mohsen Pouryazdan, Boris J P Kaus, Alexander Rack, Alexey Ershov, Horst Hahn
Severe plastic deformation of solids is relevant to many materials processing techniques as well as tribological events such as wear. It results in microstructural refinement, redistribution of phases, and ultimately even mixing. However, mostly due to inability to experimentally capture the dynamics of deformation, the underlying physical mechanisms remain elusive. Here, we introduce a strategy that reveals details of morphological evolution upon shearing up to ultrahigh strains. Our experiments on metallic multilayers find that mechanically stronger layers either fold in a quasi-regular manner and subsequently evolve into periodic vortices, or delaminate into finer layers before mixing takes place...
November 20, 2017: Nature Communications
https://www.readbyqxmd.com/read/29150729/effect-of-microemulsion-structure-on-fluorescence-and-nonlinear-optical-properties-of-rhodamine-6g
#4
M Pourtabrizi, N Shahtahmassebi, A Kompany, S Sharifi
This study is conducted to investigate the effect of nano-droplets concentration and size on linear and nonlinear optical properties of Rhodamine 6G by UV-Vis, spectrofluorometer and Z-Scan techniques. Nano-droplets were prepared by mixture of AOT, n-Decane and Water at three different water to surfactant molar ratios (W = 3, 6.7 and 40) and two dye to water mass ratios (R). At high enough dye concentration, the fluorescence intensity and its red shift depend on the concentration of dye in water nano-droplets (R)...
November 18, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/29150680/potential-landscape-of-high-dimensional-nonlinear-stochastic-dynamics-with-large-noise
#5
Ying Tang, Ruoshi Yuan, Gaowei Wang, Xiaomei Zhu, Ping Ao
Quantifying stochastic processes is essential to understand many natural phenomena, particularly in biology, including the cell-fate decision in developmental processes as well as the genesis and progression of cancers. While various attempts have been made to construct potential landscape in high dimensional systems and to estimate transition rates, they are practically limited to the cases where either noise is small or detailed balance condition holds. A general and practical approach to investigate real-world nonequilibrium systems, which are typically high-dimensional and subject to large multiplicative noise and the breakdown of detailed balance, remains elusive...
November 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29143828/large-stretchability-and-failure-mechanism-of-graphene-kirigami-under-tension
#6
Zhujiang Hua, Yang Zhao, Shuhong Dong, Peishi Yu, Yu Liu, Ning Wei, Junhua Zhao
From the macro- to the nanoscale, kirigami structures show novel and tunable properties by tailoring the original two-dimensional sheets. In this study, the large stretchability and failure behavior in graphene nanoribbon kirigami (GNR-k) are obtained using the finite element (FE) method and molecular dynamics (MD) simulations. The carbon-carbon bond in the FE method is equivalent to a nonlinear Timoshenko beam based on the Tersoff-Brenner potential. All the results from the present FE method are in reasonable agreement with those from our MD simulations using the REBO potential...
November 16, 2017: Soft Matter
https://www.readbyqxmd.com/read/29142276/detecting-the-relevance-to-performance-of-whole-body-movements
#7
Daisuke Furuki, Ken Takiyama
Goal-directed whole-body movements are fundamental in our daily life, sports, music, art, and other activities. Goal-directed movements have been intensively investigated by focusing on simplified movements (e.g., arm-reaching movements or eye movements); however, the nature of goal-directed whole-body movements has not been sufficiently investigated because of the high-dimensional nonlinear dynamics and redundancy inherent in whole-body motion. One open question is how to overcome high-dimensional nonlinear dynamics and redundancy to achieve the desired performance...
November 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29142262/observation-of-replica-symmetry-breaking-in-disordered-nonlinear-wave-propagation
#8
Davide Pierangeli, Andrea Tavani, Fabrizio Di Mei, Aharon J Agranat, Claudio Conti, Eugenio DelRe
A landmark of statistical mechanics, spin-glass theory describes critical phenomena in disordered systems that range from condensed matter to biophysics and social dynamics. The most fascinating concept is the breaking of replica symmetry: identical copies of the randomly interacting system that manifest completely different dynamics. Replica symmetry breaking has been predicted in nonlinear wave propagation, including Bose-Einstein condensates and optics, but it has never been observed. Here, we report the experimental evidence of replica symmetry breaking in optical wave propagation, a phenomenon that emerges from the interplay of disorder and nonlinearity...
November 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/29142017/modelling-the-effects-of-phylogeny-and-body-size-on-within-host-pathogen-replication-and-immune-response
#9
Soumya Banerjee, Alan S Perelson, Melanie Moses
Understanding how quickly pathogens replicate and how quickly the immune system responds is important for predicting the epidemic spread of emerging pathogens. Host body size, through its correlation with metabolic rates, is theoretically predicted to impact pathogen replication rates and immune system response rates. Here, we use mathematical models of viral time courses from multiple species of birds infected by a generalist pathogen (West Nile Virus; WNV) to test more thoroughly how disease progression and immune response depend on mass and host phylogeny...
November 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/29140364/bose-hubbard-hopping-due-to-resonant-rayleigh-scattering
#10
Andrey B Matsko, Lute Maleki
We show theoretically that dynamic behavior of light confined in the modes of a nonlinear optical ring cavity characterized by resonant Rayleigh scattering can be described using the Bose-Hubbard model. Nonlinear interaction between clockwise and counterclockwise optical modes results in instability and intermode hopping occurring at a rate defined by the frequency separation of the Rayleigh doublet harmonics. Hopping may lead to an instability and breathing behavior of a Kerr frequency comb observed in the cavity...
November 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/29140352/extended-ellipticity-control-for-attosecond-pulses-by-high-harmonic-generation
#11
Nickolai Zhavoronkov, Mikhail Ivanov
Attosecond (1  as=10(-18)  s) pulses produced through high harmonic generation (HHG) are a basis for studies of electron dynamics during light-matter interaction on an electron's natural time scale. Extensively exploited HHG technology has, however, a few unsolved problems, where producing of circularly polarized or chiral attosecond pulses belongs to them. We have demonstrated experimentally a way to control the ellipticity of attosecond pulse trains produced via HHG in two-color, bi-circular laser fields...
November 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/29140334/carrier-envelope-offset-stabilization-of-a-ghz-repetition-rate-femtosecond-laser-using-opto-optical-modulation-of-a-sesam
#12
Sargis Hakobyan, Valentin J Wittwer, Kutan Gürel, Aline S Mayer, Stéphane Schilt, Thomas Südmeyer
We demonstrate, to the best of our knowledge, the first carrier-envelope offset (CEO) frequency stabilization of a GHz femtosecond laser based on opto-optical modulation (OOM) of a semiconductor saturable absorber mirror (SESAM). The 1.05-GHz laser is based on a Yb:CALGO gain crystal and emits sub-100-fs pulses with 2.1-W average power at a center wavelength of 1055 nm. The SESAM plays two key roles: it starts and stabilizes the mode-locking operation and is simultaneously used as an actuator to control the CEO frequency...
November 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/29134067/modelling-the-role-of-correctional-services-on-gangs-insights-through-a-mathematical-model
#13
F Nyabadza, C P Ogbogbo, J Mushanyu
Research has shown that gang membership increases the chances of offending, antisocial behaviour and drug use. Gang membership should be acknowledged as part of crime prevention and policy designs, and when developing interventions and preventative programmes. Correctional services are designed to rehabilitate convicted offenders. We formulate a deterministic mathematical model using nonlinear ordinary differential equations to investigate the role of correctional services on the dynamics of gangs. The recruitment into gang membership is assumed to happen through an imitation process...
October 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/29124062/beating-heart-motion-accurate-prediction-method-based-on-interactive-multiple-model-an-information-fusion-approach
#14
Fan Liang, Weihong Xie, Yang Yu
Robot-assisted motion compensated beating heart surgery has the advantage over the conventional Coronary Artery Bypass Graft (CABG) in terms of reduced trauma to the surrounding structures that leads to shortened recovery time. The severe nonlinear and diverse nature of irregular heart rhythm causes enormous difficulty for the robot to realize the clinic requirements, especially under arrhythmias. In this paper, we propose a fusion prediction framework based on Interactive Multiple Model (IMM) estimator, allowing each model to cover a distinguishing feature of the heart motion in underlying dynamics...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29123363/whatch-em-a-weather-driven-energy-balance-model-for-determining-water-height-and-temperature-in-container-habitats-for-aedes-aegypti
#15
Daniel F Steinhoff, Andrew J Monaghan, Lars Eisen, Michael J Barlage, Thomas M Hopson, Isaac Tarakidzwa, Karielys Ortiz-Rosario, Saul Lozano-Fuentes, Mary H Hayden, Paul E Bieringer, Carlos M Welsh Rodríguez
The mosquito virus vector Aedes (Ae.) aegypti exploits a wide range of containers as sites for egg laying and development of the immature life stages, yet the approaches for modeling meteorologically sensitive container water dynamics have been limited. This study introduces the Water Height and Temperature in Container Habitats Energy Model (WHATCH'EM), a state-of-the-science, physically based energy balance model of water height and temperature in containers that may serve as development sites for mosquitoes...
December 2016: Earth interactions
https://www.readbyqxmd.com/read/29123213/detecting-abnormality-in-heart-dynamics-from-multifractal-analysis-of-ecg-signals
#16
Snehal M Shekatkar, Yamini Kotriwar, K P Harikrishnan, G Ambika
The characterization of heart dynamics with a view to distinguish abnormal from normal behavior is an interesting topic in clinical sciences. Here we present an analysis of the Electro-cardiogram (ECG) signals from several healthy and unhealthy subjects using the framework of dynamical systems approach to multifractal analysis. Our analysis differs from the conventional nonlinear analysis in that the information contained in the amplitude variations of the signal is being extracted and quantified. The results thus obtained reveal that the attractor underlying the dynamics of the heart has multifractal structure and the variations in the resultant multifractal spectra can clearly separate healthy subjects from unhealthy ones...
November 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29123194/net-primary-productivity-and-its-partitioning-in-response-to-precipitation-gradient-in-an-alpine-meadow
#17
Fangyue Zhang, Quan Quan, Bing Song, Jian Sun, Youjun Chen, Qingping Zhou, Shuli Niu
The dynamics of net primary productivity (NPP) and its partitioning to the aboveground versus belowground are of fundamental importance to understand carbon cycling and its feedback to climate change. However, the responses of NPP and its partitioning to precipitation gradient are poorly understood. We conducted a manipulative field experiment with six precipitation treatments (1/12 P, 1/4 P, 1/2 P, 3/4 P, P, and 5/4 P, P is annual precipitation) in an alpine meadow to examine aboveground and belowground NPP (ANPP and BNPP) in response to precipitation gradient in 2015 and 2016...
November 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29120713/waveform-analysis-of-deformation-amplitude-and-deflection-amplitude-in%C3%A2-normal-suspect-and-keratoconic-eyes
#18
Mathew Francis, Natasha Pahuja, Rushad Shroff, Roshan Gowda, Himanshu Matalia, Rohit Shetty, Everette J Remington Nelson, Abhijit Sinha Roy
PURPOSE: To evaluate the performance of waveform-derived variables in distinguishing normal, suspect, and keratoconic eyes. SETTING: Narayana Nethralaya Eye Hospital, Bangalore, India. DESIGN: Retrospective case series. METHODS: Scheimpflug tomography (Pentacam) and dynamic Scheimpflug analysis (Corvis ST) of 253 normal (253 patients) eyes and 205 keratoconic eyes (205 patients) were evaluated. Among the 205 patients, 62 had keratoconus in 1 eye, while the unaffected eye was suspect...
October 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29119508/endogenous-molecular-cellular-network-cancer-theory-a-systems-biology-approach
#19
Gaowei Wang, Ruoshi Yuan, Xiaomei Zhu, Ping Ao
In light of ever apparent limitation of the current dominant cancer mutation theory, a quantitative hypothesis for cancer genesis and progression, endogenous molecular-cellular network hypothesis has been proposed from the systems biology perspective, now for more than 10 years. It was intended to include both the genetic and epigenetic causes to understand cancer. Its development enters the stage of meaningful interaction with experimental and clinical data and the limitation of the traditional cancer mutation theory becomes more evident...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29119507/systems-biology-modeling-of-nonlinear-cancer-dynamics
#20
Christian Cherubini, Simonetta Filippi, Alessandro Loppini
Systems Biology represents nowadays a promising standard framework for natural and human sciences to attack complicated problems involving Life. Here a particular application of such a program is discussed in the case of Cancer, by using a basic toy model for solid tumor spread for framing together two apparently different conceptual leading paradigms of Oncogenesis.
2018: Methods in Molecular Biology
keyword
keyword
58289
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"