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https://www.readbyqxmd.com/read/27921289/slip-driven-electroosmotic-transport-through-porous-media
#1
Harshad Gaikwad, Pranab Kumar Mondal
We investigate the slip driven transport of a Newtonian fluid through porous media under electrical double layer effect. We employ a semi-analytical framework to obtain the underlying electro-hydrodynamics for different configurations of porous media. We bring out an alteration in flow dynamics, stemming from interplay among the geometrical feature of the models and the interfacial slip as modulated by the electrical forcing. Further, we show the consequent effects of the underlying flow dynamics on the volumetric transport rate through different models...
December 6, 2016: Electrophoresis
https://www.readbyqxmd.com/read/27917421/morphology-of-viscoplastic-drop-impact-on-viscoplastic-surfaces
#2
Simeng Chen, Volfango Bertola
The impact of viscoplastic drops onto viscoplastic substrates characterized by different magnitudes of the yield stress is investigated experimentally. The interaction between viscoplastic drops and surfaces has an important application in additive manufacturing, where a fresh layer of material is deposited on a partially cured or dried layer of the same material. So far, no systematic studies on this subject have been reported in literature. The impact morphology of different drop/substrate combinations, with yield stresses ranging from 1...
December 5, 2016: Soft Matter
https://www.readbyqxmd.com/read/27913147/electro-kinetically-driven-peristaltic-transport-of-viscoelastic-physiological-fluids-through-a-finite-length-capillary-mathematical-modelling
#3
Dharmendra Tripathi, Ashu Yadav, O Anwar Bég
Analytical solutions are developed for the electro-kinetic flow of a viscoelastic biological liquid in a finite length cylindrical capillary geometry under peristaltic waves. The Jefferys' non-Newtonian constitutive model is employed to characterize rheological properties of the fluid. The unsteady conservation equations for mass and momentum with electro-kinetic and Darcian porous medium drag force terms are reduced to a system of steady linearized conservation equations in an axisymmetric coordinate system...
November 29, 2016: Mathematical Biosciences
https://www.readbyqxmd.com/read/27908715/development-and-characterization-of-bacterial-cellulose-reinforced-biocomposite-films-based-on-protein-from-buckwheat-distiller-s-dried-grains
#4
Xuejiao Wang, Niamat Ullah, Xuchun Sun, Yan Guo, Lin Chen, Zhixi Li, Xianchao Feng
Biocomposite films were manufactured by combining protein extracted from buckwheat distiller's dried grains with bacterial cellulose (BC). The film microstructures showed that BC is compatible with protein matrix and endows the film with high rigidity. Differential scanning calorimetry (DSC) showed that BC can promote thermal stability of the composite films. BC promoted the transition from a Newtonian to a non-Newtonian fluid and the shear thinning behavior of protein-BC solution. Fourier Transform Infrared (FTIR) spectroscopy showed the main functional groups' absorption peaks shifted to lower wavenumbers...
November 28, 2016: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/27908703/simultaneous-effects-of-coagulation-and-variable-magnetic-field-on-peristaltically-induced-motion-of-jeffrey-nanofluid-containing-gyrotactic-microorganism
#5
M M Bhatti, A Zeeshan, R Ellahi
In this article, simultaneous effects of coagulation (blood clot) and variable magnetic field on peristaltically induced motion of non-Newtonian Jeffrey nanofluid containing gyrotactic microorganism through an annulus have been studied. The effects of an endoscope also taken into consideration in our study as a special case. The governing flow problem is simplified by taking the approximation of long wavelength and creeping flow regime. The resulting highly coupled differential equations are solved analytically with the help of perturbation method and series solution have been presented up to second order approximation...
November 29, 2016: Microvascular Research
https://www.readbyqxmd.com/read/27898299/pfg-nmr-and-bayesian-analysis-to-characterise-non-newtonian-fluids
#6
Thomas W Blythe, Andrew J Sederman, E Hugh Stitt, Andrew P E York, Lynn F Gladden
Many industrial flow processes are sensitive to changes in the rheological behaviour of process fluids, and there therefore exists a need for methods that provide online, or inline, rheological characterisation necessary for process control and optimisation over timescales of minutes or less. Nuclear magnetic resonance (NMR) offers a non-invasive technique for this application, without limitation on optical opacity. We present a Bayesian analysis approach using pulsed field gradient (PFG) NMR to enable estimation of the rheological parameters of Herschel-Bulkley fluids in a pipe flow geometry, characterised by a flow behaviour index n, yield stress τ0, and consistency factor k, by analysis of the signal in q-space...
November 10, 2016: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/27896789/mhd-natural-convection-flow-of-casson-nanofluid-over-nonlinearly-stretching-sheet-through-porous-medium-with-chemical-reaction-and-thermal-radiation
#7
Imran Ullah, Ilyas Khan, Sharidan Shafie
In the present work, the effects of chemical reaction on hydromagnetic natural convection flow of Casson nanofluid induced due to nonlinearly stretching sheet immersed in a porous medium under the influence of thermal radiation and convective boundary condition are performed numerically. Moreover, the effects of velocity slip at stretching sheet wall are also examined in this study. The highly nonlinear-coupled governing equations are converted to nonlinear ordinary differential equations via similarity transformations...
December 2016: Nanoscale Research Letters
https://www.readbyqxmd.com/read/27895558/physics-of-the-mind
#8
Leonid I Perlovsky
Is it possible to turn psychology into "hard science"? Physics of the mind follows the fundamental methodology of physics in all areas where physics have been developed. What is common among Newtonian mechanics, statistical physics, quantum physics, thermodynamics, theory of relativity, astrophysics… and a theory of superstrings? The common among all areas of physics is a methodology of physics discussed in the first few lines of the paper. Is physics of the mind possible? Is it possible to describe the mind based on the few first principles as physics does? The mind with its variabilities and uncertainties, the mind from perception and elementary cognition to emotions and abstract ideas, to high cognition...
2016: Frontiers in Systems Neuroscience
https://www.readbyqxmd.com/read/27892582/lubrication-of-chocolate-during-oral-processing
#9
S A Rodrigues, N Selway, M P Morgenstern, L Motoi, J R Stokes, B J James
The structure of chocolate is drastically transformed during oral processing from a composite solid to an oil/water fluid emulsion. Using two commercial dark chocolates varying in cocoa solids content, this study develops a method to identify the factors that govern lubrication in molten chocolate and saliva's contribution to lubrication following oral processing. In addition to chocolate and its individual components, simulated boluses (molten chocolate and phosphate buffered saline), in vitro boluses (molten chocolate and whole human saliva) and ex vivo boluses (chocolate expectorated after chewing till the point of swallow) were tested...
November 28, 2016: Food & Function
https://www.readbyqxmd.com/read/27889443/the-application-of-silicon-sol-gel-technology-to-forensic-blood-substitute-development-mimicking-aspects-of-whole-human-blood-rheology
#10
Theresa Stotesbury, Mike Illes, Paul Wilson, Andrew J Vreugdenhil
Solution-gelation chemistry has promising applications in forensic synthetic blood substitute development. This research offers a silicon-based sol-gel approach to creating stable materials that share similar rheological properties to that of whole human blood samples. Room temperature, high water content, silicon sol-gels were created using the organosilane precursors 3-glycidoxypropyltrimethoxysilane and tetraethylorthosilicate along with various concentrations of filler and pigment. Shear-thinning non-Newtonian properties were observed within most formulations of the presented materials...
November 15, 2016: Forensic Science International
https://www.readbyqxmd.com/read/27879127/numerical-simulations-of-a-3d-fluid-structure-interaction-model-for-blood-flow-in-an-atherosclerotic-artery
#11
Oualid Kafi, Nader El Khatib, Jorge Tiago, Adelia Sequeira
The inflammatory process of atherosclerosis leads to the formation of an atheromatous plaque in the intima of the blood vessel. The plaque rupture may result from the interaction between the blood and the plaque. In each cardiac cycle, blood interacts with the vessel, considered as a compliant nonlinear hyperelastic. A three dimensional idealized fluid-structure interaction (FSI) model is constructed to perform the blood-plaque and blood-vessel wall interaction studies. An absorbing boundary condition (BC) is imposed directly on the outflow in order to cope with the spurious reflexions due to the truncation of the computational domain...
February 1, 2017: Mathematical Biosciences and Engineering: MBE
https://www.readbyqxmd.com/read/27874180/passive-drip-stain-formation-dynamics-of-blood-onto-hard-surfaces-and-comparison-with-simple-fluids-for-blood-substitute-development-and-assessment
#12
Theresa Stotesbury, Michael C Taylor, Mark C Jermy
The spreading dynamics of blood dripping onto hard surfaces is compared to two spreading models. Samples of human blood, porcine blood, and Millipore(®) water were dripped onto cardboard, foamcore, and glass surfaces in low velocity passive drip simulations. Final stain diameter, the total number of spines and scallops, and angle of impact were measured and analyzed. Spreading is best predicted by applying the concept of effective viscosity to the Scheller and Bousfield (R(2)  = 0.91) and Roisman (R(2)  = 0...
November 22, 2016: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/27870992/nanoencapsulation-of-coenzyme-q10-and-vitamin-e-acetate-protects-against-uvb-radiation-induced-skin-injury-in-mice
#13
Natháli S Pegoraro, Allanna V Barbieri, Camila Camponogara, Juliane Mattiazzi, Evelyne S Brum, Marila C L Marchiori, Sara M Oliveira, Letícia Cruz
This study aimed to investigate the feasibility of producing semisolid formulations based on nanocapsule suspensions containing the association of the coenzyme Q10 and vitamin E acetate by adding gellan gum (2%) to the suspensions. Furthermore, we studied their application as an alternative for the treatment of inflammation induced by ultraviolet B (UVB) radiation. For this, an animal model of injury induced by UVB-radiation was employed. All semisolids presented pH close to 5.5, drug content above 95% and mean diameter on the nanometric range, after redispersion in water...
November 9, 2016: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/27867790/magma-injection-into-a-long-lived-reservoir-to-explain-geodetically-measured-uplift-application-to-the-2007-2014-unrest-episode-at-laguna-del-maule-volcanic-field-chile
#14
Hélène Le Mével, Patricia M Gregg, Kurt L Feigl
Moving beyond the widely used kinematic models for the deformation sources, we present a new dynamic model to describe the process of injecting magma into an existing magma reservoir. To validate this model, we derive an analytical solution and compare its results to those calculated using the Finite Element Method. A Newtonian fluid characterized by its viscosity, density, and overpressure (relative to the lithostatic value) flows through a vertical conduit, intruding into a reservoir embedded in an elastic domain, leading to an increase in reservoir pressure and time-dependent surface deformation...
August 2016: Journal of Geophysical Research. Solid Earth
https://www.readbyqxmd.com/read/27861738/online-measurement-of-viscosity-for-biological-systems-in-stirred-tank-bioreactors
#15
Maximilian Schelden, William Lima, Eric Will Doerr, Martin Wunderlich, Lars Rehmann, Jochen Büchs, Lars Regestein
One of the most critical parameters in chemical and biochemical processes is the viscosity of the medium. Its impact on mixing, as well as on mass and energy transfer is substantial. An increase of viscosity with reaction time can be caused by the formation of biopolymers like xanthan or by filamentous growth of microorganisms. In either case the properties of fermentation broth are changing and frequently non-Newtonian behavior are observed, resulting in major challenges for the measurement and control of mixing and mass transfer...
November 14, 2016: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/27858443/redshift-factor-and-the-first-law-of-binary-black-hole-mechanics-in-numerical-simulations
#16
Aaron Zimmerman, Adam G M Lewis, Harald P Pfeiffer
The redshift factor z is an invariant quantity of fundamental interest in post-Newtonian and self-force descriptions of compact binaries. It connects different approximation schemes, and plays a central role in the first law of binary black hole mechanics, which links local quantities to asymptotic measures of energy and angular momentum in these systems. Through this law, the redshift factor is conjectured to have a close relation to the surface gravity of the event horizons of black holes in circular orbits...
November 4, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27845225/on-the-demixing-of-hyaluronan-and-alginate-in-the-gel-state
#17
Francesca Scognamiglio, Andrea Travan, Michela Cok, Massimiliano Borgogna, Eleonora Marsich, Sergio Paoletti, Ivan Donati
The manuscript focuses on the demixing of hyaluronan and alginate in the hydrogel state. Binary solutions of the two polysaccharides have been treated with Ca(2+) as the alginate cross-linking ion and the radial distribution of the two components in the hydrogels was measured by means of (1)H NMR. These results revealed the presence of alginate-enriched and hyaluronan-enriched domains stemming from a polysaccharide demixing. The hydrogels were characterized by means of uniaxial compression and creep-compliance measurements which showed that the demixing increased the overall resistance of the hydrogel to stress...
November 11, 2016: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/27837522/contrasting-the-influence-of-cationic-amino-acids-on-the-viscosity-and-stability-of-a-highly-concentrated-monoclonal-antibody
#18
Barton J Dear, Jessica J Hung, Thomas M Truskett, Keith P Johnston
PURPOSE: To explain the effects of cationic amino acids and other co-solutes on the viscosity, stability and protein-protein interactions (PPI) of highly concentrated (≥200 mg/ml) monoclonal antibody (mAb) solutions to advance subcutaneous injection. METHODS: The viscosities of ≥200 mg/ml mAb1 solutions with various co-solutes and pH were measured by capillary rheometry in some cases up to 70,000 s(-1). The viscosities are analyzed in terms of dilute PPI characterized by diffusion interaction parameters (k D ) from dynamic light scattering (DLS)...
November 11, 2016: Pharmaceutical Research
https://www.readbyqxmd.com/read/27823802/in-vivo-observations-and-in-vitro-experiments-on-the-oral-phase-of-swallowing-of-newtonian-and-shear-thinning-liquids
#19
S Mowlavi, J Engmann, A Burbidge, R Lloyd, P Hayoun, B Le Reverend, M Ramaioli
In this study, an in vitro device that mimics the oral phase of swallowing is calibrated using in vivo measurements. The oral flow behavior of different Newtonian and non-Newtonian solutions is then investigated in vitro, revealing that shear-thinning thickeners used in the treatment of dysphagia behave very similar to low-viscosity Newtonian liquids during active swallowing, but provide better control of the bolus before the swallow is initiated. A theoretical model is used to interpret the experimental results and enables the identification of two dynamical regimes for the flow of the bolus: first, an inertial regime of constant acceleration dependent on the applied force and system inertia, possibly followed by a viscous regime in which the viscosity governs the constant velocity of the bolus...
October 17, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27820692/filler-content-surface-microhardness-and-rheological-properties-of-various-flowable-resin-composites
#20
S Jager, R Balthazard, A Dahoun, E Mortier
OBJECTIVES: The objectives of this study were to determine the filler content, the surface microhardness (at baseline and after immersion in water for 2 years), and the rheological properties of various flowable resin composites. METHODS: Three flowable resin composites (Grandioso Heavy Flow [GHF], Grandio Flow [GRF], Filtek Supreme XTE Flow [XTE]), one pit and fissure sealant resin composite (ClinPro [CLI]), and three experimental flowable resin composites with the same matrix and a variable filler content (EXPA, EXPB, EXPC) were tested...
November 2016: Operative Dentistry
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