نتایج جستجو برای: viscoelastic slgs

تعداد نتایج: 13135  

Journal: :Journal of biomechanics 2010
Hanna Isaksson Shijo Nagao Marta Małkiewicz Petro Julkunen Roman Nowak Jukka S Jurvelin

Nanoindentation has recently gained attention as a characterization technique for mechanical properties of biological tissues, such as bone, on the sub-micron level. However, optimal methods to characterize viscoelastic properties of bones are yet to be established. This study aimed to compare the time-dependent viscoelastic properties of bone tissue obtained with different nanoindentation meth...

2006
AGNES RENSFELT Agnes Rensfelt

Viscoelastic materials can today be found in a wide range of practical applications. In order to make efficient use of these materials in construction, it is of importance to know how they behave when subjected to dynamic load. Characterization of viscoelastic materials is therefore an important topic, that has received a lot of attention over the years. This thesis treats different nonparametr...

2016
Kate Elizabeth McCrossin David Edmund Piers Bramley Elizabeth Hessian Evelyn Hutcheon Georgina Imberger

BACKGROUND Viscoelastic tests, including thromboelastography (TEG) and rotational thromboelastometry (ROTEM), provide a global assessment of haemostatic function at the point of care. The use of a TEG or ROTEM system to guide blood product administration has been shown in some surgical settings to reduce transfusion requirements. The aim of this review is to evaluate all published evidence rega...

2016
Marc Tinguely Matthew G. Hennessy Angelo Pommella Omar K. Matar Valeria Garbin

Ultrasound-driven bubbles can cause significant deformation of soft viscoelastic layers, for instance in surface cleaning and biomedical applications. The effect of the viscoelastic properties of a boundary on the bubble-boundary interaction has been explored only qualitatively, and remains poorly understood. We investigate the dynamic deformation of a viscoelastic layer induced by the volumetr...

2007
Qingli Dai Zhanping You

A micromechanical finite element (FE) framework was developed to predict the viscoelastic properties (complex modulus and creep stiffness) of the asphalt mixtures. The two-dimensional (2D) microstructure of an asphalt mixture was obtained from the scanned image. In the mixture microstructure, irregular aggregates and sand mastic were divided into different subdomains. The FE mesh was generated ...

Journal: :Biophysical journal 2000
S Yamada D Wirtz S C Kuo

To establish laser-tracking microrheology (LTM) as a new technique for quantifying cytoskeletal mechanics, we measure viscoelastic moduli with wide bandwidth (5 decades) within living cells. With the first subcellular measurements of viscoelastic phase angles, LTM provides estimates of solid versus liquid behavior at different frequencies. In LTM, the viscoelastic shear moduli are inferred from...

Journal: :Mechanics of materials : an international journal 2012
Sounok Sen Nathan T Jacobs John I Boxberger Dawn M Elliott

The annulus fibrosus (AF) of the intervertebral disc experiences cyclic tensile loading in vivo at various states of mechanical equilibrium. Disc degeneration is associated with alterations in the biochemical composition of the AF including decreased water content, decreased proteoglycan concentration, and increased collagen deposition that affect mechanical function of the AF in compression an...

Journal: :Acta obstetricia et gynecologica Scandinavica 2014
Sara K Bastholm Naja Becher Peter R Stubbe Ioannis S Chronakis Niels Uldbjerg

OBJECTIVE To characterize the viscoelastic properties of cervical mucus plugs(CMPs) shed during labor at term. DESIGN Experimental research. SETTING Department of Obstetrics and Gynecology, Aarhus University Hospital, Denmark. POPULATION/SAMPLE Spontaneously shed CMPs from 18 healthy women in active labor. METHODS Viscoelastic properties of CMPs were investigated with a dynamic oscillat...

Journal: :Tissue engineering. Part A 2011
Leo Q Wan Jie Jiang Diana E Miller X Edward Guo Van C Mow Helen H Lu

Hydrogel-based scaffolds such as alginate have been extensively investigated for cartilage tissue engineering, largely due to their biocompatibility, ambient gelling conditions, and the ability to support chondrocyte phenotype. While it is well established that the viscoelastic response of articular cartilage is essential for articulation and load bearing, the time-dependent mechanical properti...

Journal: :Journal of biomechanical engineering 2009
Sureshkumar Kalyanam Rebecca D Yapp Michael F Insana

Ultrasonic elasticity imaging enables visualization of soft tissue deformation for medical diagnosis. Our aim is to understand the role of flow-dependent and flow-independent viscoelastic mechanisms in the response of biphasic polymeric media, including biological tissues and hydrogels, to low-frequency forces. Combining the results of confined and unconfined compression experiments on gelatin ...

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