MAX BOND Medium Viscosity A/B is a two-part epoxy based system specially formulated to provide structural bond strength, excellent water resistance for both marine and fresh water and exceptional toughness and impact resistance.. Its long pot life, high performance mechanical properties, and easy application make MAX BOND Medium Viscosity A/B an ideal resin system for hundreds of application where structural strength is required. MAX BOND Medium Viscosity A/B is 100 % solids and does not contain Ozone Depleting Chemicals (ODC).. MAX BOND Medium Viscosity A/B will cure even in humid and low temperature conditions. It is generally room temperature cured but can be snap cured at elevated temperatures for a short period of time.. MAX BOND Medium Viscosity A/B demonstrates structural bond strengths to a variety of substrates commonly used in composites industry such as, steel, aluminum and soft metals, fiberglass, concrete and ceramic and most plastics.. MAX BOND Medium Viscosity A/B performs well in ...
TY - JOUR. T1 - Photoinduced reversible change of fluid viscosity. AU - Sakai, Hideki. AU - Orihara, Yoichi. AU - Kodashima, Hideki. AU - Matsumura, Atsutoshi. AU - Ohkubo, Takahiro. AU - Tsuchiya, Koji. AU - Abe, Masahiko. PY - 2005/10/5. Y1 - 2005/10/5. N2 - We report a reversible photoinduced fluid viscosity change. A small amount of a photoswitchable azobenzene-modified cationic surfactant (4-butylazobenzene-4′-(oxyethyl)trimethylammonium bromide, AZTMA) was added to a wormlike micellar solution of cetyltrimethylammonium bromide (CTAB) containing sodium salicylate (NaSal). The trans-AZTMA solution had a remarkably high viscosity as a result of the entangled network of wormlike micelles. UV light irradiation on the trans-AZTMA solution remarkably decreased the viscosity of the solution because the bulky structure of cis-AZTMA is likely to disrupt the network structure of wormlike micelles. This photoinduced viscosity change is perfectly reversible between the trans- and cis-AZTMA ...
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D1243 - 15 Standard Test Method for Dilute Solution Viscosity of Vinyl Chloride Polymers , dilute solution viscosity, inherent viscosity, intrinsic viscosity, relative viscosity, specific viscosity, test method, vinyl chloride polymers,,
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Aim: To determine the viscoelastic properties of the porcine lens. Methods: Linear viscoelastic shear properties of the stroma of four porcine lenses were measured within 5 hours post-mortem, using sinusoidal oscillatory shear deformation. The elastic shear modulus, viscous shear modulus, dynamic viscosity, damping ratio, and phase shift of the lenses were quantified by a controlled-strain, linear simple-shear rheometer at frequencies of 10-50 Hz.. Results: The mean viscoelastic properties and their standard deviations across the frequencies examined were: the elastic shear modulus, G′ = 6.2±4.0 Pa, the viscous shear modulus, G″ = 19.2±2.5 Pa, the dynamic viscosity, η′ = 0.16±0.1 Pa•sec, the damping ratio ζ = 4.06±1.25, and the phase shift, δ = 76°± 5.6°.. Conclusions: The measured viscoelastic shear properties of the porcine lens reflect a low dynamic viscosity with a high damping ratio. The porcine lens is viscoelastic and is more viscous than elastic. The magnitude of the ...
The reorientation of a magnetic nickel nanorod placed at the air/phospholipid interface is used to calculate the surface viscosity of spread monolayers of phospholipids, dipalmitoyl phosphatidyl choline (DPPC) and dimyristoyl phosphatidyl ethanolamine (DMPE). While surface viscosity was found to depend on the surface pressure in both lipids, we detect an order of magnitude higher surface viscosity for DMPE films even in the so called liquid coexistence region. This difference is higher than that reported at higher surface pressures and is attributed to the smaller headgroup size of DMPE. The smaller size of the PE head group increases the ability of the lipid molecules to pack into more organized domains at all surface pressures. The minute changes in the morphology of the lipid film are more significant at the lower surface pressures, which contributes to a higher surface viscosity difference. Thus microrheology presents an insight into the degree of lipid organization at the air/water ...
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An approach to the Influence of Fluid Viscosity and the Cutting Parameters in Turning a Carbon Steel Using Surface Methodology, Kamel Bousnina, Ali Falleh, This experimental study focuses on the effect of viscosity on the surface condition of machined parts during turning. The tests are carried out on C45 steel, using metal carbide cutting tools. The objective is to optimize the cutting parameters as well as the analysis of the surface roughness (Ra), using the surface response method, which allows to present the mathematical models of the roughness. The effect of the interactions on the roughness criterion was studied using a statistical analysis based on analysis of variance (ANOVA). The results recorded show that the cutting speed has the most significant effect on the surface condition. This optimization deduces that the best surface roughness of the non-alloy steel parts C45 is obtained when the cutting speed is 286 m / min, the feed rate is 0,15 mm / rev, the viscosity is 22,5 Pa.s and the depth
Case Study 16: In the modern pump industry, processed fluids are characterized by a wide spectrum of viscosity values. An unpredicted variation of actual process fluid properties, including viscosity, may lead to unexpected pump performance alteration. Also manufacturing deviations from expected internal pump geometry may cause pump performance deterioration. Both causes may determine undesired limitations of the pump operating range and plant production loss. The present Case Study illustrates a real case story of incorrect evaluation of the process fluid viscosity and pump geometry deviations, both determining performance deteriorations, described through a detailed evaluation of the internal pump losses. From the presentation of a real case, this case study highlights the importance of both the correct evaluation of viscous effects and the internal pump geometry through the application of existing loss correlations ...
The relationship of the microstructure of supercooled, highly viscous glycerol to the temperature dependence of its density, thermal expansion coefficient, and shear viscosity are discussed. The character of this temperature dependence at the transition from low viscosity state to the solid amorphous state solidified state without nuclei is described with help of function psi, which can be interpreted as the effective number of degrees of freedom responsible for the change of viscosity of glycerol over a broad range; these degrees of freedom are those related to the alpha-relaxation process. It is shown that the change in effective activation energy of the viscosity is completely determined by the parameter psi. The change in the shear viscosity of glycerol due to the influence of the solid-phase nuclei is considered. It is shown that the introduction of the parameter phi, equal to the specific volume occupied by the nuclei of the solid phase, together with psi provides a natural explanation ...
Molylube Extreme Pressure High Viscosity Grease, commonly known as Molylube 87M EP Grease, is an aluminum complex, multi-purpose grease formulated to extend the service life of machine components in the severe duty applications encountered in mining, quarrying, construction, cement and other heavy industries where its high base oil viscosity ensures maximum lubricating film thickness. Molylube Extreme Pressure High Viscosity Grease is especially effective when used to lubricate the suspension components of heavy-duty equipment such as excavators, dozers, loaders and haul trucks. The rust and corrosion inhibitors utilized in of Molylube Extreme Pressure High Viscosity Grease provide full protection of equipment surfaces. Grades 680-1 and 1000-1 are Komatsu approved.. ...
TY - JOUR. T1 - Viscosity change and structural transition of Molten Fe at 5 GPa. AU - Terasaki, Hidenori. AU - Kato, Takumi. AU - Urakawa, S.. AU - Funakoshi, K.. AU - Sato, K.. AU - Suzuki, A.. AU - Okada, T.. PY - 2002/4/15. Y1 - 2002/4/15. N2 - The in situ viscosity measurements of the pure molten Fe under high pressures were made by falling sphere X-ray radiography method. Viscosity coefficients at about 2000 K were 15-24 mPa s at 2.7-5.0 GPa, and 4-9 mPa s at 5.0-7.0 GPa. Drastic decrease was found at around 5 GPa, at which stable solid phase below the melting temperatures change from delta (bcc) to gamma (fcc) phases. The observation indicates the possibility that the structural change in the molten Fe occurs in a narrow pressure interval (1 GPa) at the similar condition with the phase transformation in the solid.. AB - The in situ viscosity measurements of the pure molten Fe under high pressures were made by falling sphere X-ray radiography method. Viscosity coefficients at about 2000 K ...
Viscosizer TD provides automated relative viscosity measurements with high reproducibility at low viscosity, to help identify molecules with abnormally high viscosity-concentration profiles at low sample concentrations as early as possible in the development pipeline.. ...
AMETEK Brookfield, the world standard for viscosity measurement and control, is offerings its Practical Course on Viscosity Measurements. This popular course was created to help AMETEK Brookfield Vi
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Coherent survey of Global High Viscosity Pumps Market 2019. The top competitors are also performing various strategic moves such as acquisitions, partnerships, amalgamations, new technology implementation, and product/service launches, brand promotions. The report provides an inclusive analysis based on their strategies in order to assist novice market players. Precisely evaluated statistics of revenue, sale, profit, growth rate, and CAGR of contenders are also underscored in the global High Viscosity Pumps market report.. Furthermore, the report renders an in-depth assessment of crucial High Viscosity Pumps market segments, which includes types, applications, and regions. competitive scenario, industry environment, market projection, growth constraining factors, limitations, entry barriers, provincial regulatory framework as well as upcoming investment and business opportunities, challenges, and other growth-promoting factors. The report thoroughly investigates diving forces, changing market ...
A low viscosity lubricating oil composition having a CCS viscosity less than 3500 mPa.s at −25 C. and having no more than 0.16 mass % of phosphorus which comprises a dispersant, and a detergent of calcium or magnesium or both; and optionally a zinc dihydrocarbyldithiophosphate, a viscosity modifier, a pour point depressant and an antioxidant. The oil satisfies the Cummins M11 cross-head wear engine test specification in a low phosphorus and low viscosity formulation.
TY - JOUR. T1 - On the potential importance of non-linear viscoelastic material modelling for numerical prediction of brain tissue response : test and application. AU - Brands, D.W.A.. AU - Bovendeerd, P.H.M.. AU - Wismans, J.S.H.M.. PY - 2002. Y1 - 2002. N2 - In current Finite Element (FE) head models, brain tissue is commonly assumed to display linear viscoelastic material behaviour. However, brain tissue behaves like a non-linear viscoelastic solid for shear strains above 1%. The main objective of this study was to study the effect of non-linear material behaviour on the predicted brain response. We used a nonlinear viscoelastic constitutive model, developed on the basis of experimental shear data presented elsewere. First we tested the numerical implementation of the constitutive model by simulating the response of a silicone gel (Sylgard 572 A&B) filled cylindrical cup, subjected to a transient rotational acceleration. The experimental results could be reproduced within 9%. Subsequently, ...
There has been a trend in the automotive industry toward the use of lower viscosity engine oils as fuel economy requirements become more demanding across the globe. Lower viscosity fluids may improve fuel economy due to their improved pumpability, lower churning losses, and thinner lubricating films. However, there is one important caveat related to the use of these fluids: the amount of improvement, if any, is hardware design and application dependent. Standard industry fuel economy tests and engines with differing designs may show divergent responses when using lower viscosity engine oils, not always showing an improved fuel economy response. This paper summarizes the work conducted by the authors to demonstrate how and why the inconsistent results in fuel economy can occur with low viscosity oils ...
We study the intrinsic nature of the finite system-size effect in estimating shear viscosity of dilute and dense fluids within the framework of the Green-Kubo approach. From extensive molecular dynamics simulations, we observe that the size effect on shear viscosity is characterized by an oscillatory behavior with respect to system size L at high density and by a scaling behavior with an L-1 correction term at low density. Analysis of the potential contribution in the shear-stress autocorrelation function reveals that the former is configurational and is attributed to the inaccurate description of the long-range spatial correlations in finite systems. Observation of the long-time inverse-power decay in the kinetic contribution confirms its hydrodynamic nature. The L-1 correction term of shear viscosity is explained by the sensitive change in the long-time tail obtained from a finite system ...
TY - JOUR. T1 - Menthol-based eutectic mixtures. T2 - Hydrophobic low viscosity solvents. AU - Ribeiro, Bernardo D.. AU - Florindo, Catarina. AU - Iff, Lucas C.. AU - Coelho, Maria A Z. AU - Marrucho Ferreira, Isabel Maria. PY - 2015/9/10. Y1 - 2015/9/10. N2 - Inspired by one of the major problems in the pharmaceutical industry, we advantageously used the formation of eutectic mixtures to synthesize new solvents. The aim of this work is to identify low viscosity, cheap, biodegradable and hydrophobic eutectic solvents from natural resources. Consequently, novel eutectic mixtures based on DL-menthol and naturally occurring acids, namely pyruvic acid, acetic acid, L-lactic acid, and lauric acid, were synthesized and are here reported for the first time. The obtained DLmenthol-based eutectic mixtures were analyzed using NMR and FTIR spectroscopy in order to check their structures and purities and to confirm the interaction of the two compounds leading to the eutectic formation. Important solvent ...
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Experimental evidence is presented that the intrinsic viscosity of solutions of mixed proteins obeys the additive equation. See PDF for Equation.. The datum serves to characterize the system, and combined with other analytical techniques and fractionation procedures, enables one to analyze and characterize subfractions. The plasmas and sera of clinically normal individuals give intrinsic viscosity values agreeing with calculated values. The intrinsic viscosity values for pathological plasmas and sera in all cases are greater than normal and reflect the augmented levels of those proteins fibrinogen, α2-globulins, and γ-globulins occurring in the pathological state. The method is readily adaptable to routine clinical use and furnishes a measure of the departure from normal of protein levels in serum and plasma.. ...
Solvent-borne epoxy coatings are the dominant coating technology used to protect metal assets in the marine, petrochemical, and infrastructure markets, due to their excellent balance of properties, including corrosion resistance, chemical resistance, and adhesion. However, due to market and regulatory drivers for reduced volatile organic compound (VOC) emissions and improved worker safety, there is a need for new epoxy resins that enable ultra-high solids (|= 90%) epoxy coatings with improved performance for maintenance and protective coating applications. Currently available ultra-high solids coatings based on standard epoxy resins can suffer from a number of drawbacks, including high viscosity, poor spray application qualities, and reduced corrosion resistance. This paper will highlight a novel low viscosity epoxy (LVE) that demonstrates significantly lower viscosity versus standard bisphenol-A and bisphenol-F epoxy resins, while enabling ultra-high solids coatings with improved sprayability and
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There are two types of viscosity that we usually deal with; kinematic and dynamic viscosity. Kinematic viscosity is a measure of a fluids internal resistance to flow under the force of gravity, and is usually given in the units of centistokes, cSt. Dynamic viscosity is a measure of a fluids resistance to flow when there is an external force, and has the units of centipoise, cP. For pump analysis dynamic viscosity is generally more useful, but kinematic viscosity does have application - especially for Newtonian liquids, and if you find yourself needing to measure the kinematic viscosity then a glass capillary is the simplest way.. The glass capillary is usually several hundred millimeters tall, and is made with precise length and inside diameter dimensions. It will have show two marks on the capillary, and the kinematic viscosity is determined by simply measuring the time it takes for a known quantity of the liquid to flow through the capillary between the two marks, and multiplying it by a ...
The dynamics of drop formation and pinch-off have been investigated for a series of low viscosity elastic fluids possessing similar shear viscosities, but differing substantially in elastic properties. On initial approach to the pinch region, the viscoelastic fluids all exhibit the same global necking behaviour that is observed for a Newtonian fluid of equivalent shear viscosity. For these low viscosity dilute polymer solutions, inertial and capillary forces form the dominant balance in this potential flow regime, with the viscous force being negligible. The approach to the pinch point, which corresponds to the point of rupture for a Newtonian fluid, is extremely rapid in such solutions, with the sudden increase in curvature producing very large extension rates at this location. In this region the polymer molecules are significantly extended, causing a localised increase in the elastic stresses, which grow to balance the capillary pressure. This prevents the necked fluid from breaking off, as ...
TY - JOUR. T1 - Evaluating viscosity of surimi paste at different moisture contents. AU - Yoon, Won B.. AU - Gunasekaran, Sundaram. AU - Park, Jae W.. PY - 2004. Y1 - 2004. N2 - The steady and dynamic shear viscosity of fish muscle protein paste obtained from Alaska pollock surimi at 95%, 90%, 85%, 80%, and 75% of moisture contents were measured in the temperature range of 5°C to 20°C. To estimate the steady shear viscosity at high shear rate from dynamic shear viscosity, the modified Cox-Merz rule was applied by introducing a frequency shift factor. The concentration dependence of zero-shear viscosity showed power-law dependence with an exponent of 3.5, and the universal behavior of viscosity at different protein concentrations was observed by a introducing reduced variables. The Carreau model was applied to describe the shear- thinning behavior of the surimi paste, and the model parameters estimated empirically showed moisture content dependence. The viscous flow behavior was independent of ...
Background: In this study, we have investigated the viscoelastic behaviour of individual human adult bone marrow-derived mesenchymal stem cells (hMSCs) and the role of F-actin filaments in maintaining these properties, using micropipette aspiration technique together with a standard linear viscoelastic solid model. Results: Under a room temperature of 20°C, the instantaneous and equilibrium Youngs modulus, E0 and E∞, were found to be 886 ± 289 Pa and 372 ± 125 Pa, respectively, while the apparent viscosity, μ, was 2710 ± 1630 Pa·s. hMSCs treated with cytochalasin D up to 20 μM at 20°C registered significant drop of up to 84% in stiffness and increase of up to 255% in viscosity. At the physiological temperature of 37°C, E0 and E∞ have decreased by 42-66% whereas μ has increased by 95%, compared to the control. Majority of the hMSCs behave as viscoelastic solid with a rapid initial increase in aspiration length and it gradually levels out with time. Three other types of non-typical ...
The modeling of the viscous behavior of nanoemulsions and nanosuspensions is discussed. The influences of the viscosity ratio, solvation and aggregation of nanodroplets and nanoparticles on the relative viscosity of nanofluids are considered. The relative viscosity of a nanofluid is strongly affected by solvation of nanoparticles. The scaling of the relative viscosity of nanoemulsions is successfully carried out using the volume fraction of the solvated nanodroplets. Four sets of experimental relative viscosity data of nanoemulsions consisting of different diameter nanodroplets (27.5 nm-205 nm) all collapse on a single unique curve when the data are scaled on the basis of the volume fraction of the solvated nanodroplets. A similar scaling is achieved using six sets of experimental relative viscosity data on nanosuspensions consisting of different diameter nanoparticles (29 nm-146 nm). A new modified version of the Oldroyd model is proposed to describe and predict the viscosity of nanofluids. The model
In this study, planar induced fluorescence (PLIF) was used for the first time to evaluate variability in drug dissolution data using Rhodamine-6G doped tablets within small volume USP 2 apparatus. The results were compared with tablets contained theophylline (THE) drug for conventional dissolution analysis. The impact of hydrodynamics, sampling point, dissolution media viscosity and pH were investigated to note effects on release of these two actives from the hydrophilic matrix tablets. As expec
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Improved very high viscosity (putty) two component polymerizable polyorganosiloxane composition for use in making dental impressions, having improved tear strength, handling and wettability. Improved tear strength results from inclusion of a quadri-functional polysiloxane having a vinyl content of 0.16 to 0.24 m-mole/g. Working time is maintained by including sufficient amounts of a retarder composition that delays onset of the vinyl polymerization. Handling is improved by the addition of a very high viscosity linear vinyl terminated polydimethylsiloxane which reduces tackiness and improves the shelf stability. Wettability is improved by including a surfactant resulting in a surface contact angle with water at three minutes of less than 50 . The surfactant chosen has an HLB of 8-11, such that the wetting contact angle is achieved within less than two minutes and remains wetting throughout the working time of the impression taking, substantially improving the impression making process.
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Cambridge Viscosity is the global leader in fluid viscosity measurement, including oil and gas; petroleum and biofuels; coatings, paints, and inks; pharmaceuticals, and other substances. Where accurate viscosity measurement is mission critical in both process and laboratory environments, Cambridge Viscosity technologies are chosen time and time again.. Our leadership is based on a quarter-century of experience, the extraordinary range of our products - including both in-line and in-tank applications - and our innovative proprietary technology. Our customers include leading organisations in oil and gas exploration, refining, automotive, research, industrial materials, and other high-stakes fields.. Cambridge Viscosity has set the standard for extraordinarily precise, reliable, and virtually maintenance-free viscosity measurement systems. Our sensors and viscometer systems conform to ASTM, DIN, JIS and ISO standards, with a range of models designed to meet specific industry and application needs. ...
TY - JOUR. T1 - Dynamic viscosity modeling of methane plus n-decane and methane plus toluene mixtures: Comparative study of some representative models. AU - Baylaucq, A.. AU - Boned, C.. AU - Canet, X.. AU - Zeberg-Mikkelsen, Claus Kjær. AU - Cisneros, Sergio. AU - Zhou, H.G.. PY - 2005. Y1 - 2005. N2 - Viscosity measurements of well-defined mixtures are useful in order to evaluate existing viscosity models. Recently, an extensive experimental study of the viscosity at pressures up to 140 MPa has been carried out for the binary systems methane + n-decane and methane toluene, between 293.15 and 373.15 and for several methane compositions. Although very far from real petroleum fluids, these mixtures are interesting in order to study the potential of extending various models to the simulation of complex fluids with asymmetrical components (light/heavy hydrocarbon). These data (575 data points) have been discussed in the framework of recent representative models (hard sphere scheme, friction ...
Read Concentration effect of N-isopropylacrylamide on viscoelastic properties of hydrosoluble thermo-thickening copolymers, Polymer Bulletin on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
Simple fluids like water (low viscosity), glycerin (high viscosity) are Newtonian and exhibit viscosity effects, the dissipation of energy when particles move in such fluids. But dissolve macromolecules in these liquids -synthetic or biopolymers-and networks can form. In addition to viscosity effects, there are now elasticity effects, the storage of energy when embedded particle move. By following the mean square displacement (MSD) of tracer (probe) particles in such fluid and microrheological properties such as η*, the complex viscosity, G″, the viscous loss modulus, and G′, the elastic storage modulus, can be determined as a function of frequency.. Measurement of the autocorrelation function (ACF) using DLS techniques yields the MSD of tracer particles, which, under the right conditions, can be used to determine η*, G″, and G′ over a range of frequencies much higher than mechanical rheometers can attain. Much smaller sample volumes, in the microliters, are possible compared to ...
D4683 - 17 Standard Test Method for Measuring Viscosity of New and Used Engine Oils at High Shear Rate and High Temperature by Tapered Bearing Simulator Viscometer at 150 °C , absolute viscometer, absolute viscometry, dynamic viscosity, engine oils, high shear rate viscosity, high shear viscosity, high temperature viscosity, high shear rate viscosity at 150 ,°,C, rotational viscometer, rotational viscometry, Tapered Bearing Simulator Viscometer, TBS,,
Following the launch of the new m-VROCi, Viscometer/Rheometer On a Chip, at Pittcon 2014, Malvern Instruments will focus on the unique technology of this system and the considerable benefits it delivers in a webinar on 16 April 2014. The m-VROCi provides safe, accurate viscosity measurement for low viscosity industrial fluids, under conditions that reflect those that apply during end-product use.
I havent read any of the articles yet, so heres my big chance to insert my foot in my mouth. I will start collecting the references and will post what I learn, so public humiliation is a real possibility here. My guess is that the polymer is breaking up some sort of weak network in the solvent (hydrogen bonding, polar-polar interactions...) so that the solvent has a lower viscosity, thus leading to the negative intrinsic viscosity - and the need for a new theory to explain it. Yes, go with a new theory since the old theory made a certain set of assumptions that are no longer valid ...
While the above-mentioned viscosity modifiers can satisfy part of the oil recovery needs, these polymers still experience some challenges that hinder their effectiveness. For example, when the viscosity of reservoir oil is high, so should the displacing fluid be to match the mobility ratio. The current heuristics suggest that polymer flooding should be applied in reservoirs with oil viscosities between 10 and 150 cP (Taber et al. 1997).. The key factor limiting the recommended range is that for oil viscosities greater than 150 cP, the injected-water-viscosity values required for a favorable mobility ratio correspond to prohibitively low values of polymer injectivity. In addition, pumping high-viscosity displacing fluids tends to lead to clogging in oil wells, which results in a major economic well operating loss. One potential solution is to use displacement fluids with an adjustable viscosity, with the fluid having a low viscosity at the injection site and a high viscosity upon reaching the oil ...
In this study, changes in the viscoelastic material properties of brain tissue due to traumatic diffuse axonal injury (DAI) were investigated. The impact acceleration model was used to generate DAI in rat brain stem. The viscoelastic material properties of brain tissue along the corticospinal (CSpT) tract in the brain stem were characterized using an indentation technique and a quasilinear theory. The results show significant reduction in the elastic response of brain tissue due to injury. In regions with significantly more DAI, larger changes in the elastic shear modulus and relaxation function were observed. These findings can improve the injury predictability of computational models of brain injury.. Copyright © 2007 by ASME ...