89,189 results match your criteria Nonlinear Biomedical Physics [Journal]


A 'Fingerprint' of locomotor maturation: Motor development descriptors, reference development bands and data-set.

Gait Posture 2018 Nov 29;68:232-237. Epub 2018 Nov 29.

Department of Electrical, Electronic and Information Engineering "Guglielmo Marconi", University of Bologna, Via del Risorgimento 2, 40136 Bologna, Italy.

Background: When aiming at studying and monitoring locomotor development in childhood, innovative indexes for the characterization of motor control performance and wearable technologies have highlighted the potential of significant advances. In particular, quantitative assessment of motor performance during natural walking (NW) and tandem walking (TW) has been proposed to highlight manifestations of motor automaticity and complexity, respectively.

Research Question: This work aims at providing a quantitative overview of metrics characterizing locomotor maturation in a typically developing population, by analysing NW and TW. Read More

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November 2018

Nonlinear electrokinetic motion of electrically induced Janus droplets in microchannels.

J Colloid Interface Sci 2018 Nov 27;538:277-285. Epub 2018 Nov 27.

Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada. Electronic address:

The nonlinear electrokinetic motion of electrically induced Janus droplets (EIJDs) in a microchannel is studied in this paper. The EIJDs were fabricated by operating the positively charged aluminum oxide nanoparticles to partially cover the oil droplets with electric field. The nanoparticle coverage of the EIJDs changes with the electric field strength, which leads to the variation of the electrophoretic mobility of the EIJDs. Read More

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November 2018
2 Reads

Computational study of new 1,2,3-triazole derivative of lithocholic acid: Structural aspects, non-linear optical properties and molecular docking studies as potential PTP 1B enzyme inhibitor.

Comput Biol Chem 2018 Nov 22;78:144-152. Epub 2018 Nov 22.

Department of Chemistry, University of Delhi, Delhi, 110007, India. Electronic address:

We have reported synthesis of a novel 1,2,3-triazole conjugate of lithocholic acid by 1,3-dipolar cycloaddition reaction. The molecular properties such as geometry, conformations, bond lengths and dihedral angles were investigated theoretically. The bond order analysis was performed using Wiberg bond order (WBO), Fuzzy bond order (FBO) and Laplacian bond order (MBO) method. Read More

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November 2018
1 Read

Light-Induced Activation of Forbidden Exciton Transition in Strongly Confined Perovskite Quantum Dots.

ACS Nano 2018 Dec 6. Epub 2018 Dec 6.

We report the strong light-induced activation of forbidden exciton transition in CsPbBr perovskite quantum dots mediated by the symmetry-breaking polaron that modifies the optical selection rule of the confined exciton transition. The activated forbidden transition results in an intense pump-induced absorption in the transient absorption spectra above the bandgap, where the original parity-forbidden transition was located. In contrast to many other semiconductor quantum dots, photoexcitation of exciton in CsPbBr quantum dots creates a sufficiently large perturbation via lattice-distorting polaron, which turns on the formally forbidden transition. Read More

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December 2018
4 Reads
12.881 Impact Factor

Statistical modeling of the effect of rainfall flushing on dengue transmission in Singapore.

PLoS Negl Trop Dis 2018 Dec 6;12(12):e0006935. Epub 2018 Dec 6.

Draper, Cambridge, Massachusetts, United States of America.

Background: Rainfall patterns are one of the main drivers of dengue transmission as mosquitoes require standing water to reproduce. However, excess rainfall can be disruptive to the Aedes reproductive cycle by "flushing out" aquatic stages from breeding sites. We developed models to predict the occurrence of such "flushing" events from rainfall data and to evaluate the effect of flushing on dengue outbreak risk in Singapore between 2000 and 2016. Read More

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December 2018
1 Read

Nanocone-based plasmonic metamaterials.

Nanotechnology 2019 Feb;30(5):055301

Department of Physics and London Centre for Nanotechnology, King's College London, Strand, London, WC2R 2LS, United Kingdom.

Metamaterials and metasurfaces provide unprecedented opportunities for designing light-matter interactions. Optical properties of hyperbolic metamaterials with meta-atoms based on plasmonic nanorods, important in nonlinear optics, sensing and spontaneous emission control, can be tuned by varying geometrical sizes and arrangement of the meta-atoms. At the same time the role of the shape of the meta-atoms forming the array has not been studied. Read More

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February 2019

The brain network in a model of thalamo-cortical dysrhythmia.

Brain Connect 2018 Dec 6. Epub 2018 Dec 6.

Saratovskij nacional'nyj issledovatel'skij gosudarstvennyj universitet imeni N G Cernysevskogo, 64958 , Astrakhanskaya str., 83 , Saratov, Russian Federation , 410012.

Sensory information processing and higher cognitive functions rely on the interactions between thalamus and cortex. Many types of neurological and psychiatric disorders are accompanied or driven by alterations in the brain connectivity. In the present study putative changes in functional and effective cortico-cortical (CC), thalamo-cortical (TC) and cortico-thalamic (CT) connectivity during wakefulness and slow-wave sleep in a model of thalamo-cortical dysrhythmia (TCD), TRIP8b-/- mice and in control (WT) mice are described. Read More

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December 2018
3 Reads

Noninterleaved Metasurface for (2-1) Spin- and Wavelength-Encoded Holograms.

Nano Lett 2018 Dec 6. Epub 2018 Dec 6.

Department of Electrical and Computer Engineering , National University of Singapore , 4 Engineering Drive 3 , Singapore 117583 , Singapore.

Nanostructured metasurfaces demonstrate extraordinary capabilities to control light at the subwavelength scale, emerging as key optical components to physical realization of multitasked devices. Progress in multitasked metasurfaces has been witnessed in making a single metasurface multitasked by mainly resorting to extra spatial freedom, for example, interleaved subarrays, different angles. However, it imposes a challenge of suppressing the cross-talk among multiwavelength without the help of extra spatial freedom. Read More

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December 2018
4 Reads

High-Fidelity Modeling of Detector Lag and Gantry Motion in CT Reconstruction.

Conf Proc Int Conf Image Form Xray Comput Tomogr 2018 May;2018:318-322

Department of Biomedical Engineering, Johns Hopkins University.

Detector lag and gantry motion during x-ray exposure and integration both result in azimuthal blurring in CT reconstructions. These effects can degrade image quality both for high-resolution features as well as low-contrast details. In this work we consider a forward model for model-based iterative reconstruction (MBIR) that is sufficiently general to accommodate both of these physical effects. Read More

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Rainfall pulse response of carbon fluxes in a temperate grass ecosystem in the semiarid Loess Plateau.

Ecol Evol 2018 Nov 23;8(22):11179-11189. Epub 2018 Oct 23.

State Key Laboratory of Soil Erosion and Dry-land Farming on the Loess Plateau Institute of Soil and Water Conservation Chinese Academy of Sciences and the Ministry of Water Resources Yangling China.

Rainfall pulses can significantly influence carbon cycling in water-limited ecosystems. The magnitude of carbon flux component responses to precipitation may vary depending on precipitation amount and antecedent soil moisture, associated with nonlinear responses of plants and soil microbes. The present study was carried out in a temperate grass ecosystem during 2013-2015 in the semiarid Loess Plateau of China, to examine the response of carbon fluxes to precipitation using the "threshold-delay" model. Read More

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November 2018
1 Read

Evaluation of modeling strategies for assessing self-thinning behavior and carrying capacity.

Ecol Evol 2018 Nov 11;8(22):10768-10779. Epub 2018 Nov 11.

School of Forest Resources University of Maine Orono ME.

Self-thinning and site maximum carrying capacity are key concepts for understanding and predicting ecosystem dynamics as they represent the outcome of several fundamental ecological processes (e.g., mortality and growth). Read More

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November 2018

Automatic Seizure Detection Based on Nonlinear Dynamical Analysis of EEG Signals and Mutual Information.

Basic Clin Neurosci 2018 Jul-Aug;9(4):227-240. Epub 2018 Jul 1.

Department of Bioelectrical Engineering, School of Electrical Engineering, Iran University of Science and Technology, Tehran, Iran.

Introduction: In this paper, nonlinear dynamical analysis based on Recurrence Quantification Analysis (RQA) is employed to characterize the nonlinear EEG dynamics. RQA can provide useful quantitative information on the regular, chaotic, or stochastic property of the underlying dynamics.

Methods: We use the RQA-based measures as the quantitative features of the nonlinear EEG dynamics. Read More

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Walking activity during ambulant cardiac rehabilitation is related to maximum working capacity, age, and smoking behavior.

Vasc Health Risk Manag 2018 9;14:361-369. Epub 2018 Nov 9.

Institute of Sports and Preventive Medicine, Saarbrücken, Germany,

Background: A total of 6,500 to 8,000 steps per day are recommended for cardiovascular secondary prevention. The aim of this research was to examine how many steps per day patients achieve during ambulant cardiac rehabilitation (CR), and if there is a correlation between the number of steps and physical and cardiological parameters.

Methods: In all, 192 stable CR patients were included and advised for sealed pedometry. Read More

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November 2018

Nonlinear rise in Greenland runoff in response to post-industrial Arctic warming.

Nature 2018 12 5;564(7734):104-108. Epub 2018 Dec 5.

Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, Netherlands.

The Greenland ice sheet (GrIS) is a growing contributor to global sea-level rise, with recent ice mass loss dominated by surface meltwater runoff. Satellite observations reveal positive trends in GrIS surface melt extent, but melt variability, intensity and runoff remain uncertain before the satellite era. Here we present the first continuous, multi-century and observationally constrained record of GrIS surface melt intensity and runoff, revealing that the magnitude of recent GrIS melting is exceptional over at least the last 350 years. Read More

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December 2018

Rabi splitting and optical Kerr nonlinearity of quantum dot mediated by Majorana fermions.

Sci Rep 2018 Dec 5;8(1):17677. Epub 2018 Dec 5.

School of Mechanics and Photoelectric Physics, Anhui University of Science and Technology, Huainan Anhui, 232001, China.

Majorana fermions (MFs), due to their significance in fundamental physics and potential applications in topological quantum computation based on solid-state devices, have drawn widespread attention. Here, we design a hybrid semiconductor/superconductor ring (S/SR) device and put forward an optical method for detecting a pair of MFs in the S/SR device with a quantum dot (QD) with the popular optical pump-probe scheme, which is very different from the present electrical method only considering one nearby MF coupled to the QD. The symmetric and unsymmetric Rabi splitting and optical Kerr nonlinear effect of QD mediated by MFs are investigated under uncoupled and coupled majorana modes, respectively. Read More

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December 2018

Multifractal Analysis Differentiates Postural Sway in Obese and Nonobese Children.

Motor Control 2018 Dec 5:1-10. Epub 2018 Dec 5.

5 The University of Queensland.

Multifractal analyses have been used in recent years as a way of studying balance, with the goal of understanding the patterns of movement of the center of pressure at different spatial scales. A multifractal detrended fluctuation analysis was used to compare obese and nonobese children to investigate the cause of previously demonstrated deficiencies in balance for obese children. Twenty-two children (11 obese and 11 nonobese), aged 8-15 years, performed 30-s trials of bilateral static balance on a plantar pressure distribution measuring device. Read More

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December 2018

Robust Lane-Detection Method for Low-Speed Environments.

Sensors (Basel) 2018 Dec 4;18(12). Epub 2018 Dec 4.

School of Electronic Information, Wuhan University, Wuhan 430072, China.

Vision-based lane-detection methods provide low-cost density information about roads for autonomous vehicles. In this paper, we propose a robust and efficient method to expand the application of these methods to cover low-speed environments. First, the reliable region near the vehicle is initialized and a series of rectangular detection regions are dynamically constructed along the road. Read More

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December 2018
2 Reads

Output-Based Dynamic Event-Triggered Mechanisms for Disturbance Rejection Control of Networked Nonlinear Systems.

IEEE Trans Cybern 2018 Dec 3. Epub 2018 Dec 3.

This paper proposes a new output-based dynamic event-triggered mechanism (ETM) for disturbance rejection control of a class of networked nonlinear uncertain systems subject to additive time-varying disturbance. In the proposed control method, a new robust output feedback controller is first designed based on a generalized proportional-integral observer to attenuate/compensate the undesirable influence of nonlinear uncertainties and disturbances. Different from the static ETM, two new dynamic variables are defined, and thereafter, two kinds of different discrete-time dynamic ETMs are developed only using the sampled-data output signal, such that a better tradeoff between the communication properties and the control properties can be obtained. Read More

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December 2018

A Novel and Safe Two-Stage Screening Method for Support Vector Machine.

IEEE Trans Neural Netw Learn Syst 2018 Dec 3. Epub 2018 Dec 3.

To make support vector machine (SVM) applicable to large-scale data sets, safe screening rules are developed recently. The main idea is to reduce the scale of SVM by safely discarding the redundant training samples. Among existing safe screening rules, the dual screening method with variational inequalities (DVI) and the dynamic screening rule (DSR) based on duality gap are two representative strategies. Read More

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December 2018

Interaction of Water with the Gypsum (010) Surface: Structure and Dynamics from Nonlinear Vibrational Spectroscopy and Ab Initio Molecular Dynamics.

J Am Chem Soc 2018 Dec 3. Epub 2018 Dec 3.

Instituto de Física de São Carlos , Universidade de São Paulo , CP 369, São Carlos , São Paulo 13560-970 , Brazil.

Water-mineral interfaces are important for several environmental, industrial, biological, and geological processes. Gypsum, CaSO·2HO, is a widespread mineral of high technological, medical, and environmental relevance, but little is known about its surface structure and its interaction with water. A molecular-level understanding of gypsum/water interface is given here by a combined experimental/theoretical study. Read More

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December 2018

Assessment of age-related differences in smoking status and health-related quality of life (HRQoL): Findings from the 2016 Behavioral Risk Factor Surveillance System.

J Community Psychol 2019 Jan 10;47(1):93-103. Epub 2018 Jul 10.

National Center for HIV/AIDS, Viral Hepatitis, STD, and TB Prevention, US Centers for Disease Control and Prevention.

Despite significant declines in the use of cigarettes, a significant proportion of adults smoke. This study explores the association between smoking and health-related quality of life (HRQoL) by age. The 2016 Behavioral Risk Factor Surveillance System survey was administered to adults in 50 states and District of Columbia (n = 437,195). Read More

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January 2019

Longitudinal Occurrence and Predictors of Patient-Provider Discordance Between Global Assessments of Disease Activity in Rheumatoid Arthritis: A Case-Control Study.

Arthritis Care Res (Hoboken) 2018 Nov 30. Epub 2018 Nov 30.

Division of Rheumatology.

Objective: The objective was to identify longitudinal predictors of discordance between patients with rheumatoid arthritis (RA) and their health care providers, where patient global assessment of disease activity is substantially higher than provider global assessment.

Methods: This retrospective case-control study included 102 cases with positive discordance (ie, ≥25 mm between patient and provider global assessments) and 102 controls without discordance who were matched for age, sex, RA duration, and Clinical Disease Activity Index (CDAI). Data were collected at the baseline visit (date of diagnosis or earliest available visit), the index visit (participation in a previous cross-sectional study), and at up to 11 additional visits before the index visit. Read More

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November 2018

Development of a Population Pharmacokinetic Model of Vancomycin and its Application in Chinese Geriatric Patients with Pulmonary Infections.

Eur J Drug Metab Pharmacokinet 2018 Nov 30. Epub 2018 Nov 30.

Department of Nephrology, Peking University First Hospital, No.1 Dahongluochang Street, Xicheng District, Beijing, China.

Background: The optimal use of vancomycin in the elderly requires information about the drug's pharmacokinetics and the influence of various factors on the drug's disposition. However, because of sampling restrictions, it is often difficult to perform traditional pharmacokinetic studies in elderly patients.

Objective: This study was conducted to estimate the population pharmacokinetics of vancomycin in Chinese geriatric patients (age ≥ 65 years) with pulmonary infections and to explore the clinical application of this information for vancomycin dose individualization. Read More

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November 2018

A unified continuum and variational multiscale formulation for fluids, solids, and fluid-structure interaction.

Comput Methods Appl Mech Eng 2018 Aug 9;337:549-597. Epub 2018 Apr 9.

Department of Pediatrics (Cardiology), Bioengineering, and Institute for Computational and Mathematical Engineering, Stanford University, Clark Center E1.3, 318 Campus Drive, Stanford, CA 94305, USA.

We develop a unified continuum modeling framework using the Gibbs free energy as the thermodynamic potential. This framework naturally leads to a pressure primitive variable formulation for the continuum body, which is well-behaved in both compressible and incompressible regimes. Our derivation also provides a rational justification of the isochoric-volumetric additive split of free energies in nonlinear elasticity. Read More

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August 2018
1 Read

Perceptual decision making: Biases in post-error reaction times explained by attractor network dynamics.

J Neurosci 2018 Nov 30. Epub 2018 Nov 30.

Laboratoire de Physique Statistique, École Normale Supérieure, PSL University, Université Paris Diderot, Université Sorbonne Paris Cité, Sorbonne Université, CNRS, 75005 Paris, France.

Perceptual decision-making is the subject of many experimental and theoretical studies. Most modeling analyses are based on statistical processes of accumulation of evidence. In contrast, very few works confront attractor network models' predictions with empirical data from continuous sequences of trials. Read More

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November 2018
1 Read

Diclazuril nonlinear mixed-effects pharmacokinetic modelling of plasma concentrations after oral administration to adult horses every 3-4 days.

Vet J 2018 Dec 8;242:74-76. Epub 2018 Nov 8.

Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California, One Shields Avenue, Davis, CA 95616, USA. Electronic address:

The purpose of this study was to determine if a low dose of diclazuril (0.5mg/kg of 1.56% diclazuril pellets) given to six healthy adult horses every 3-4 days for a total of five administrations would achieve steady-state plasma concentrations known to be inhibitory to Sarcocystis neurona and Neospora caninum. Read More

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December 2018

Hydrophobic Mismatch Modulates Stability and Plasticity of Human Mitochondrial VDAC2.

Biophys J 2018 Nov 7. Epub 2018 Nov 7.

Molecular Biophysics Laboratory, Department of Biological Sciences, Indian Institute of Science Education and Research, Bhopal, India. Electronic address:

The human mitochondrial outer membrane protein voltage-dependent anion channel isoform 2 (hVDAC2) is a β-barrel metabolite flux channel that is indispensable for cell survival. It is well established that physical forces imposed on a transmembrane protein by its surrounding lipid environment decide protein structure and stability. Yet, how the mitochondrial membrane and protein-lipid interplay together regulate hVDAC2 stability is unknown. Read More

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November 2018

Trajectory planning and tracking control of a ground mobile robot: A reconstruction approach towards space vehicle.

ISA Trans 2018 Nov 20. Epub 2018 Nov 20.

State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun, PR China; Department of Control Science and Engineering, Jilin University, Changchun, PR China. Electronic address:

With the development of the similarity calculation method, the orbital motion of space vehicle can be translated into a sequence of waypoints that reflect position and velocity on the ground. In this paper, a motion control system is proposed to make the mobile robot pass through the desired waypoints for reconstructing the orbital motion. First, the parameterized trajectory optimization method is applied to generate a curvature-continuous trajectory from the waypoints, the position and velocity demands are presented as the equality constraints. Read More

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November 2018

Diet-related inflammation and risk of prostate cancer in the California Men's Health Study.

Ann Epidemiol 2018 Nov 2. Epub 2018 Nov 2.

Division of Research, Kaiser Permanente Northern California, Oakland.

Purpose: The purpose of the study was to examine the relationship between proinflammatory diet and prostate cancer risk.

Methods: Energy-adjusted Dietary Inflammatory Index (E-DII) scores were computed among 40,161 participants in the California Men's Health Study. Over 9. Read More

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November 2018

Multiple routes to mind wandering: Predicting mind wandering with resource theories.

Conscious Cogn 2018 Nov 28;67:26-43. Epub 2018 Nov 28.

PracticeCraft, LLC, 1210 Green Knoll Dr., Sugar Land, TX 77579, United States. Electronic address:

Three experiments examine individual (attentional capacity) and task-related characteristics leading to mind wandering, and the effect of mind wandering on task performance. Drawing on resource theories, we tested interactive nonlinear effects of these predictors, manipulating task demand using math tests of varying difficulty (Exp 1: N = 143, three levels between-subjects; Exp 2: N = 59, three levels within-subjects; Exp 3: N = 133, four levels within-subjects). Results confirmed that mind wandering was most frequent during extreme task demand levels, although the effect varied somewhat between experiments. Read More

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November 2018

The Effects of Missed Doses of Antibiotics on Hospitalized Patient Outcomes.

J Surg Res 2019 Jan 4;233:276-283. Epub 2018 Sep 4.

Division of Acute Care Surgery, Center for Translational Injury Research, Department of Surgery, McGovern Medical School, University of Texas Health Science Center at Houston, Houston, Texas. Electronic address:

Background: Missing doses of antibiotics in hospitalized patients is a well-described but inadequately recognized issue. We hypothesized that missing doses of antibiotics decreases quality of care.

Methods: Retrospective study on patients admitted to the Shock Trauma ICU from February to June 2015. Read More

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January 2019
2 Reads

Distributed model reference adaptive containment control of heterogeneous uncertain multi-agent systems.

ISA Trans 2018 Nov 10. Epub 2018 Nov 10.

School of Automation Science and Engineering, South China University of Technology, Guangzhou 510641, China.

In this paper, a distributed model reference adaptive control (MRAC) design framework is proposed for containment control of heterogeneous uncertain multi-agent systems (MAS). Both groups of leaders and followers are considered to have general linear dynamics with the leaders subject to bounded external inputs and the followers subject to uncertain system dynamics. Two distributed adaptive control protocols are developed under this framework. Read More

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November 2018

Implementation of continuous fast scanning detection in femtosecond Fourier-transform two-dimensional vibrational-electronic spectroscopy to decrease data acquisition time.

Rev Sci Instrum 2018 Nov;89(11):113104

Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195, USA.

Femtosecond Fourier transform two-dimensional vibrational-electronic (2D VE) spectroscopy is a recently developed third-order nonlinear spectroscopic technique to measure coupled electronic and vibrational motions in the condensed phase. The viability of femtosecond multidimensional spectroscopy as an analytical tool requires improvements in data collection and processing to enhance the signal-to-noise ratio and increase the amount of data collected in these experiments. Here a continuous fast scanning technique for the efficient collection of 2D VE spectroscopy is described. Read More

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November 2018

Translation-orientation coupling and Cox-Merz rule of liquid hexane.

J Chem Phys 2018 Nov;149(20):204502

Graduate School of Engineering, Nagoya University, Furo-cho B2-3 (611), Chikusa, Nagoya, Aichi 464-8603, Japan.

Equilibrium and non-equilibrium molecular dynamics simulations are performed on liquid hexane in order to clarify the origin of the Cox-Merz rule of liquids composed of chain-like molecules. The relation between the frequency-dependent complex shear viscosity and the shear-rate dependent nonlinear viscosity follows the Cox-Merz rule as expected. The slowest viscoelastic relaxation mode is explained by the translation-orientation coupling mechanism, and the saturation of the shear-induced orientational order is observed in the non-equilibrium simulation at the onset of the shear thinning. Read More

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November 2018

Demodulated standing solitary wave and DNA-RNA transcription.

Chaos 2018 Nov;28(11):113103

Joint Institute for Nuclear Research, Joliot-Curie 6, 141980 Dubna, Moscow Region, Russia.

Nonlinear dynamics of DNA molecule at segments where DNA-RNA transcription occurs is studied. Our basic idea is that the solitary wave, moving along the chain, transforms into a demodulated one at these segments. The second idea is that the wave becomes a standing one due to interaction with DNA surrounding, e. Read More

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November 2018

Nonlinear dynamics of U.S. equity factor portfolios.

Authors:
Matthew A Wey

Chaos 2018 Nov;28(11):113109

Sovereign Asset Management, Oklahoma City, Oklahoma 73105, USA.

Evidence of both a latent nonlinear dependence and chaos is presented for U.S. equity factors, or portfolios of individual equities constructed in such a way so as to maintain exposure to some sort of financial risk premium or behavioral anomaly. Read More

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November 2018

Multistability in the cyclic competition system.

Chaos 2018 Nov;28(11):113110

Department of Mathematical Sciences, Ulsan National Institute of Science and Technology, Ulsan 44919, Republic of Korea.

Cyclically competition models have been successful to gain an insight of biodiversity mechanism in ecosystems. There are, however, still limitations to elucidate complex phenomena arising in real competition. In this paper, we report that a multistability occurs in a simple rock-paper-scissor cyclically competition model by assuming that intraspecific competition depends on the logistic growth of each species density. Read More

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November 2018

The trapping problem of the weighted scale-free treelike networks for two kinds of biased walks.

Chaos 2018 Nov;28(11):113115

Department of Mathematics, Nanjing University, Nanjing 210093, People's Republic of China.

It has been recently reported that trapping problem can characterize various dynamical processes taking place on complex networks. However, most works focused on the case of binary networks, and dynamical processes on weighted networks are poorly understood. In this paper, we study two kinds of biased walks including standard weight-dependent walk and mixed weight-dependent walk on the weighted scale-free treelike networks with a trap at the central node. Read More

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November 2018

Turing-Hopf bifurcation analysis in a superdiffusive predator-prey model.

Chaos 2018 Nov;28(11):113118

School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, People's Republic of China.

The predator-prey model with superdiffusion is investigated in this paper. Here, the existence of Turing-Hopf bifurcation and the resulting dynamics are studied. To understand such a degenerate bifurcation in the anomalously diffusive system, the weakly nonlinear analysis is employed and the amplitude equations at the Turing-Hopf bifurcation point are obtained. Read More

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November 2018

Nonlinear Microfluidics.

Anal Chem 2018 Dec 3. Epub 2018 Dec 3.

Microfluidic flows are traditionally characterized by low flow rates through channels at very small length scales, with the goal of transporting small sample volumes in a predictable manner for biological or chemical analysis, or interrogating physical processes within a highly controlled flow. As the field of microfluidics has matured, its research community has expanded operating conditions and choice of fluids, utilizing microfluidics as a playground for exploring complex nonlinear phenomena such as inertial migration and ordering, viscoelastic and elasto-inertial flows, three-dimensional vortex dynamics, and engineering the structure of the fluid itself. Over a decade of study has formed sub-disciplines focusing on these fascinating flow physics, which are beginning to translate into exciting applications and technologies. Read More

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December 2018

First-Principles Calculation of Third-Order Elastic Constants via Numerical Differentiation of the Second Piola-Kirchhoff Stress Tensor.

Phys Rev Lett 2018 Nov;121(21):216001

Department of Chemistry, College of Staten Island, Staten Island, New York 10314, USA.

A general method is presented to calculate from first principles the full set of third-order elastic constants of a material of arbitrary symmetry. The method here illustrated relies on a plane-wave density functional theory scheme to calculate the Cauchy stress and the numerical differentiation of the second Piola-Kirchhoff stress tensor to evaluate the elastic constants. It is shown that finite difference formulas lead to a cancellation of the finite basis set errors, whereas simple solutions are proposed to eliminate numerical errors arising from the use of Fourier interpolation techniques. Read More

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November 2018

3D Magneto-Optical Trap of Yttrium Monoxide.

Phys Rev Lett 2018 Nov;121(21):213201

JILA, National Institute of Standards and Technology and Department of Physics, University of Colorado, Boulder, Colorado 80309, USA.

We report three-dimensional trapping of an oxide molecule (YO), using a radio-frequency magneto-optical trap (MOT). The total number of molecules trapped is ∼1.5×10^{4}, with a temperature of 4. Read More

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November 2018

Analytic Mode Normalization for the Kerr Nonlinearity Parameter: Prediction of Nonlinear Gain for Leaky Modes.

Phys Rev Lett 2018 Nov;121(21):213905

4th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart, Germany.

Based on the resonant-state expansion with analytic mode normalization, we derive a general master equation for the nonlinear pulse propagation in waveguide geometries that is valid for bound and leaky modes. In the single-mode approximation, this equation transforms into the well-known nonlinear Schrödinger equation with a closed expression for the Kerr nonlinearity parameter. The expression for the Kerr nonlinearity parameter can be calculated on the minimal spatial domain that spans only across the regions of spatial inhomogeneities. Read More

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November 2018

Avoided Crossing and sub-Fourier-sensitivity in Driven Quantum Systems.

Phys Rev Lett 2018 Nov;121(21):213904

Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom.

The response of a linear system to an external perturbation is governed by the Fourier limit, with the inverse of the interaction time constituting a lower limit for the system bandwidth. This does not hold for nonlinear systems, which can thus exhibit sub-Fourier-behavior. The present Letter identifies a mechanism for sub-Fourier-sensitivity in driven quantum systems, which relies on avoided crossing between Floquet states. Read More

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November 2018

Differences in the Phenology of Harmonia axyridis (Coleoptera: Coccinellidae) and Native Coccinellids in Central Europe.

Environ Entomol 2018 Dec 4. Epub 2018 Dec 4.

Department of Nonlinear Modeling, Institute of Computer Science AS CR, Prague, Czech Republic.

Harmonia axyridis (Pallas), an invasive non-native species in central Europe, can outcompete other aphidophagous species. The distribution and abundance of H. axyridis vary depending on different host plants, and its effects on native coccinellid communities may change accordingly. Read More

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December 2018

Architected Origami Materials: How Folding Creates Sophisticated Mechanical Properties.

Adv Mater 2018 Dec 5:e1805282. Epub 2018 Dec 5.

Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI, 48109, USA.

Origami, the ancient Japanese art of paper folding, is not only an inspiring technique to create sophisticated shapes, but also a surprisingly powerful method to induce nonlinear mechanical properties. Over the last decade, advances in crease design, mechanics modeling, and scalable fabrication have fostered the rapid emergence of architected origami materials. These materials typically consist of folded origami sheets or modules with intricate 3D geometries, and feature many unique and desirable material properties like auxetics, tunable nonlinear stiffness, multistability, and impact absorption. Read More

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December 2018
3 Reads

Validation of an in vivo Medical Image-Based Young Human Lumbar Spine Finite Element Model.

J Biomech Eng 2018 Dec 5. Epub 2018 Dec 5.

ASME Fellow, Mechanical and Aerospace Engineering Department, Biomedical Engineering Department, University of California, Davis, 2132 Bainer Drive, Davis, CA 95616-5294.

Mathematical models of the human spine can be used to investigate spinal biomechanics without the difficulties, limitations and ethical concerns associated with physical experimentation. Validation of such models is necessary to ensure the modeled system behavior accurately represents the physics of the actual system. The goal of this work was to validate a medical image-based nonlinear lumbosacral spine finite element model of a healthy 20-year-old female subject under physiological moments. Read More

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December 2018
1 Read

Dynamic Balance during Human Movement: Measurement and Control Mechanisms.

J Biomech Eng 2018 Dec 5. Epub 2018 Dec 5.

Motion Analysis Center, Brooks Rehabilitation, Jacksonville, FL, USA.

Walking can be exceedingly complex to analyze due to highly nonlinear multi-body dynamics, nonlinear relationships between muscle excitations and resulting muscle forces, dynamic coupling that allows muscles to accelerate joints and segments they do not span, and redundant muscle control. Walking requires the successful execution of a number of biomechanical functions such as providing body support, forward propulsion and balance control, with specific muscle groups contributing to their execution. Thus, muscle injury or neurological impairment that affects muscle output can alter the successful execution of these functions and impair walking performance. Read More

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December 2018
1 Read

Novel cyclometallated 5-π-delocalized donor-1,3-di(2-pyridyl)benzene platinum(ii) complexes with good second-order nonlinear optical properties.

Dalton Trans 2018 Dec 5. Epub 2018 Dec 5.

Dipartimento di Chimica dell'Università degli Studi di Milano, UdR-INSTM, via Golgi 19, I-20133, Milano, Italy. and ISTM-CNR and SmartMatLab dell'Università degli Studi di Milano, via Golgi 19, I-20133, Milano, Italy.

Five new platinum(ii) complexes bearing a cyclometallated 5-π-delocalized donor-1,3-di(2-pyridyl)benzene were prepared and fully characterized. Their second-order nonlinear optical (NLO) properties were determined by the Electric-Field Induced Second Harmonic generation (EFISH) technique, working in DMF solution with an incident wavelength of 1907 nm, whereas the dipole moments were determined by Density Functional Theory (DFT) calculations. Remarkably, the platinum(ii) complex with a cyclometallated 5-guaiazulene-CH[double bond, length as m-dash]CH-1,3-di(2-pyridyl)benzene appears as a very good candidate for application in photonics, being characterized by the largest second-order NLO response. Read More

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December 2018
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Impact of uncertainties related to noise indicator determination on observed exposure-effect relationship.

Noise Health 2018 Sep-Oct;20(96):212-216

Kirisits Consulting Engineers, Pinkafeld/Vienna, Austria.

Context: Noise indicators are the basis to describe noise exposure-effect relationships. The assessment of these noise indicators in field studies includes various uncertainties, so that the true values differ from the determined values used for establishing curve fits. If the relationship between a noise indicator and its effect is nonlinear, uncertainties of the noise indicator modify the observed exposure-effect relationships. Read More

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December 2018
1.430 Impact Factor