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Dynamic plates

Daojing Li, Deyuan Shen, Lei Li, Dingyuan Tang, Lei Su, Luming Zhao
Internal polarization dynamics of vector dissipative-soliton-resonance (DSR) pulses in a mode-locked fiber laser are investigated. By utilizing a wave plate analyzer configuration to analyze the special structure of a DSR pulse, we find that polarization state is not uniform across a resonant dissipative soliton. Specifically, although the central plane wave of the resonant dissipative soliton acquires nearly a single fixed polarization, the dissipative fronts feature polarization states that are different and spatially varying...
March 15, 2018: Optics Letters
Joshua L Haworth, Adam J Strang, Mathias Hieronymus, Mark S Walsh
BACKGROUND AND AIM: Many people use balance training as a rehabilitation or habilitation modality. Although the time course of changes to temporal and spatial aspects of postural sway over the initial weeks of such training is as yet unclear. Particularly, we sought to explore the effects of training on sway during a dynamic task of stance on an ultra-compliant surface. Such a task provides different mechanical, and thus sensorimotor, constraints compared to stance on a solid surface...
March 15, 2018: Somatosensory & Motor Research
Christopher Steven Marcum, Megan R Goldring, Colleen M McBride, Susan Persky
Background: Meal construction is largely governed by nonconscious and habit-based processes that can be represented as a collection of in dividual, micro-level food choices that eventually give rise to a final plate. Despite this, dietary behavior intervention research rarely captures these micro-level food choice processes, instead measuring outcomes at aggregated levels. This is due in part to a dearth of analytic techniques to model these dynamic time-series events. Purpose: The current article addresses this limitation by applying a generalization of the relational event framework to model micro-level food choice behavior following an educational intervention...
February 17, 2018: Annals of Behavioral Medicine: a Publication of the Society of Behavioral Medicine
Yogev Koren, Yoav Raanan, Yisrael Parmet, Simona Bar-Haim
BACKGROUND AND OBJECTIVE: Walking is a complex human behavior, usually performed in a dynamic environment. Gait parameters are thought to reflect this complexity. Re-StepTM is a therapy system in the form of a computerized shoe, originally developed for the training and rehabilitation of individuals with brain damage. This system may be used as model for studying the complexity that underlies gait. As the first step, we present here the feasibility of the model, after establishing the validity and reliability of stride time and stride-time variability, observed in healthy adults...
March 13, 2018: Physiological Measurement
Hongze Wang, Motoki Nakanishi, Yosuke Kawahito
An experimental system to observe the inner phenomenon of keyhole and molten pool through glass plate by high speed camera and spectrometer in high power density laser welding was set up. Two circular flows in the molten pool were observed by high speed camera, which transferred the mass from the front to the rear of the keyhole to keep the mass balance. Temperature distribution in the molten pool was firstly detected by spectrometer, which indicated that the circular flows acted as the cooling system to take heat away from the keyhole...
March 5, 2018: Optics Express
Su Jin Lee, Ricky Mehta-Desai, Kyunggeune Oh, Jon Sanford, Boris I Prilutsky
PURPOSE: Kinetic characteristics of transfers to and from a toilet performed using bilateral grab bars are not fully quantified to inform grab bar design and configuration. The purpose of this study was to (1) determine effects of bilateral swing-away grab bars on peaks of ankle, knee and hip joint moments during grab bar assisted stand-to-sit and sit-to-stand transfers; and (2) determine effects of three different heights and widths of swing-away grab bars on the same kinetic characteristics...
March 9, 2018: Disability and Rehabilitation. Assistive Technology
Qiang Qiu, James D P Moore, Sylvain Barbot, Lujia Feng, Emma M Hill
Understanding the rheological properties of the upper mantle is essential to develop a consistent model of mantle dynamics and plate tectonics. However, the spatial distribution and temporal evolution of these properties remain unclear. Here, we infer the rheological properties of the asthenosphere across multiple great megathrust earthquakes between 2004 and 2014 along the Sumatran subduction zone, taking advantage of decade-long continuous GPS and tide-gauge measurements. We observe transient mantle wedge flow following these earthquakes, and infer the temporal evolution of the effective viscosity...
March 8, 2018: Nature Communications
Krister Wiklund, Hanqing Zhang, Tim Stangner, Bhupender Singh, Esther Bullitt, Magnus Andersson
We report an interpolation model to calculate the hydrodynamic force on tethered capsule-shaped cells in micro-fluidic flows near a surface. Our model is based on numerical solutions of the full Navier-Stokes equations for capsule-shaped objects considering their geometry, aspect ratio and orientation with respect to fluid flow. The model reproduced the results from computational fluid dynamic simulations, with an average error of <0.15 % for objects with an aspect ratio up to 5, and the model exactly reproduced the Goldman approximation of spherical objects close to a surface...
March 6, 2018: Microbiology
Yongjin Liu, Steven Kyle, Paul D Straight
Competitive interactions between bacteria reveal physiological adaptations that benefit fitness. Bacillus subtilis is a Gram-positive species with several adaptive mechanisms for competition and environmental stress. Biofilm formation, sporulation, and motility are the outcomes of widespread changes in a population of B. subtilis . These changes emerge from complex, regulated pathways for adapting to external stresses, including competition from other species. To identify competition-specific functions, we cultured B...
January 2018: MSphere
Rosa Kaviani, Irene Londono, Stefan Parent, Florina Moldovan, Isabelle Villemure
The objective of this study was to investigate the effects of mechanical modulation parameters on structural proteins biocomposition and mechanical properties of the growth plate. Establishing these parameters is a crucial step in the development of fusionless treatment of scoliosis. In this study, ulna explants from 4-weeks-old (pubertal) swines were used. The biocomposition was characterized using biochemical content evaluation and immunohistochemistry. Mechanical properties were characterized by fitting the data of the stress relaxation curves using a fibril reinforced biphasic model...
March 1, 2018: Journal of Musculoskeletal & Neuronal Interactions
Hendrik Kohlhof, Sebastian Köhring, Dieter Christian Wirtz, Hartmut Witte
The number of hip and knee arthroplasty replacement surgeries is increasing steadily. In combination with demographic aging and the number of periprosthetic complications, this development has lead to the phenomenon where the need for revision surgery is rising. The problem is, that, while implantation procedures of hip arthroplasties are more or less standardized, explantation is a non-standardized task for experienced specialists, due to the unpredictability of the adequate loosening method. The surgeon often only gets to decide on which tools and methods may be applied to detach the prosthesis, only after getting access to the operation site...
March 2, 2018: Biomedizinische Technik. Biomedical Engineering
Ziqiu Tong, Gayathri Rajeev, Keying Guo, Angela Ivask, Scott McCormick, Enzo Lombi, Craig Priest, Nicolas H Voelcker
With the advances in nanotechnology, particles with various size, shape, surface chemistry and composition can be easily produced. Nano- and microparticles have been extensively explored in many industrial and clinical applications. Ensuring that the particles themselves are not possessing any toxic effects to the biological system is of paramount importance. This paper describes a proof of concept method in which a microfluidic system is used in conjunction with a cell microarray technique aiming to streamline the analysis of particle-cell interaction in a high throughput manner...
March 2, 2018: Analytical Chemistry
Susanne Schäfer, Kent Urban, Maria Gerber, Markus Dekiff, Dieter Dirksen, Ulrich Plate
Implantation of micromass cultures of osteoblastic cells offers the possibility of scaffold free tissue engineering for example, regeneration of bone defects. However, the details of cell dynamics during the formation of these micromasses are still not well understood. This study aims to investigate and clarify the extent to which cell quantity influences the dynamics of micromass formation of osteoblastic cell cultures. For this purpose, the migration and aggregation during this process are investigated by optical inspection employing image processing software that allows for automated tracking of cell groups using digital image correlation...
March 1, 2018: Cytometry. Part A: the Journal of the International Society for Analytical Cytology
Zhenzhen Zhang, Jiawen Guo, Yali Sun, Beimin Tian, Xiaojuan Zheng, Ming Zhou, Lin He, Shaofeng Zhang
OBJECTIVES: The purpose of this study is to improve wear resistance and mechanical properties of lithium disilicate glass-ceramics by refining their crystal sizes. METHODS: After lithium disilicate glass-ceramics (LD) were melted to form precursory glass blocks, bar (N = 40, n = 10) and plate (N = 32, n = 8) specimens were prepared. According to the differential scanning calorimetry (DSC) of precursory glass, specimens G1-G4 were designed to form lithium disilicate glass-ceramics with different crystal sizes using a two-step thermal treatment...
February 20, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Anne-Mari Luhtanen, Eeva Eronen-Rasimus, Hanna M Oksanen, Jean-Louis Tison, Bruno Delille, Gerhard S Dieckmann, Janne-Markus Rintala, Dennis H Bamford
Viruses are recognized as important actors in ocean ecology and biogeochemical cycles, but many details are not yet understood. We participated in a winter expedition to the Weddell Sea, Antarctica, to isolate viruses and to measure virus-like particle abundance (flow cytometry) in sea ice. We isolated 59 bacterial strains and the first four Antarctic sea-ice viruses known (PANV1, PANV2, OANV1, and OANV2), which grow in bacterial hosts belonging to the typical sea-ice genera Paraglaciecola and Octadecabacter...
February 22, 2018: FEMS Microbiology Ecology
Nikola Bulatović, Miroslav Kezunović, Čedomir Vučetić, Nermin Abdić, Ivan Benčić, Tomislav Čengić
The rate of periprosthetic femoral fractures following total hip replacement has been growing steadily in the last 20 years and ranges from 0.1% to 2.1%. These fractures are mostly related to older patients with the presence of chronic diseases and frequently poor bone quality. The treatment is surgically very complex and demanding, followed by a series of complications. The evaluation in this retrospective study included 23 patients who were medically treated from January 2004 to December 2015 with the mean follow-up of 14...
September 2017: Acta Clinica Croatica
Ruslan D Yamaletdinov, Oleg V Ivakhnenko, Olga V Sedelnikova, Sergey N Shevchenko, Yuriy V Pershin
Using computational and theoretical approaches, we investigate the snap-through transition of buckled graphene membranes. Our main interest is related to the possibility of using the buckled membrane as a plate of capacitor with memory (memcapacitor). For this purpose, we performed molecular-dynamics (MD) simulations and elasticity theory calculations of the up-to-down and down-to-up snap-through transitions for membranes of several sizes. We have obtained expressions for the threshold switching forces for both up-to-down and down-to-up transitions...
February 23, 2018: Scientific Reports
Aviv Karnieli, Ady Arie
We propose and analyze a new way for obtaining an adiabatic geometric phase for light, via the sum-frequency-generation nonlinear process. The state of light is represented by the complex amplitudes at two different optical frequencies, coupled by the second order nonlinearity of the medium. The dynamics of this system is then shown to be equivalent to that of a spin-1/2 particle in a magnetic field, which in turn can be rotated adiabatically on the Bloch sphere. When the input wave itself is an eigenstate of the magnetic field equivalent, the geometric phase is manifested as a pure phase factor...
February 19, 2018: Optics Express
Ingrid Surono, Jessica Verhoeven, Sanne Verbruggen, Koen Venema
AIM: to test the effect of microencapsulation on the survival of two probiotic strains isolated from Dadih, Indonesian fermented buffalo milk, in a dynamic, computer controlled in vitro model of the upper gastrointestinal (GI) tract (TIM-1), simulating human adults. METHODS AND RESULTS: Free or microencapsulated probiotics, L.plantarum IS-10506 or E.faecium IS-27526, resuspended in milk were studied for survival in the complete TIM-1 system (stomach + small intestine) or in the gastric compartment of TIM-1 only...
February 23, 2018: Journal of Applied Microbiology
Haizhen Luo, Xiaoyun Wang, Mengying Fan, Lingyun Deng, Chuyao Jian, Miaoluan Wei, Jie Luo
Visual input could benefit balance control or increase postural sway, and it is far from fully understanding the effect of visual stimuli on postural stability and its underlying mechanism. In this study, the effect of different visual inputs on stability and complexity of postural control was examined by analyzing the mean velocity (MV), SD, and fuzzy approximate entropy (fApEn) of the center of pressure (COP) signal during quiet upright standing. We designed five visual exposure conditions: eyes-closed, eyes-open (EO), and three virtual reality (VR) scenes (VR1-VR3)...
2018: Frontiers in Neurology
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