Searched for: subject:"Stiffness"
(1 - 20 of 46)

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Piras, D. (author), van Neer, P.L.M.J. (author), Thijssen, R.M.T. (author), Sadeghian, H. (author)
article 2020
document
Ruiz-Zapata, A.M. (author), Heinz, A. (author), Kerkhof, M.H. (author), van de Westerlo-van Rijt, C. (author), Schmelzer, C.E.H. (author), Stoop, R. (author), Kluivers, K.B. (author), Oosterwijk, E. (author)
Fibroblast to myofibroblast differentiation is a key feature of wound-healing in soft tissues, including the vagina. Vaginal fibroblasts maintain the integrity of the vaginal wall tissues, essential to keep pelvic organs in place and avoid pelvic organ prolapse (POP). The micro-environment of vaginal tissues in POP patients is stiffer and has...
article 2020
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Mirahmadi, F. (author), Koolstra, J.H. (author), Fazaeli, S. (author), Lobbezoo, F. (author), van Lenthe, G.H. (author), Snabel, J. (author), Stoop, R. (author), Everts, V. (author)
Nutrition of articular cartilage relies mainly on diffusion and convection of solutes through the interstitial fluid due to the lack of blood vessels. The diffusion is controlled by two factors: steric hindrance and electrostatic interactions between the solutes and the matrix components. Aging comes with changes in the cartilage structure and...
article 2019
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Piras, D. (author), Fillinger, L. (author), Rajadurai, S.R.S. (author), van Es, M.H. (author), van der Lans, M.J. (author)
In order to make stiffness based subsurface AFM a quantitative imaging modality, the experimental subsurface measurement must be interpreted with a versatile forward (and inverse) model. We have developed a fully parametric finite element model framework for the quantification of critical dimensions relevant in semicon applications. After...
other 2019
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Mirahmadi, F. (author), Koolstra, J.H. (author), Lobbezoo, F. (author), van Lenthe, G.H. (author), Ghazanfari, S. (author), Snabel, J. (author), Stoop, R. (author), Everts, V. (author)
Objective: Aging is accompanied by a series of changes in mature tissues that influence their properties and functions. Collagen, as one of the main extracellular components of cartilage, becomes highly crosslinked during aging. In this study, the aim was to examine whether a correlation exists between collagen crosslinking induced by artificial...
article 2018
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Mirahmadi, F. (author), Koolstra, J.H. (author), Fazaeli, S. (author), Lobbezoo, F. (author), van Lenthe, G.H. (author), Snabel, J. (author), Stoop, R. (author), Arbabi, V. (author), Weinans, H. (author), Everts, V. (author)
Objective Aging can cause an increase in the stiffness of hyaline cartilage as a consequence of increased protein crosslinks. By induction of crosslinking, a reduction in the diffusion of solutions into the hyaline cartilage has been observed. However, there is a lack of knowledge about the effects of aging on the biophysical and biochemical...
article 2018
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DemĨenko, A. (author), Wilson, R. (author), Cooper, J.M. (author), Mazilu, M. (author), Volker, A.W.F. (author)
This paper shows that acoustoelasticity in one-dimensional (1D) multilayered isotropic hyperelastic materials can be understood through the analysis of elastic wave velocities as a function of applied stress. This theoretical framework is used for eigenvalue analyses in stressed elastic structures through a reformulation of the stiffness matrix...
article 2018
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van Teeffelen, K.J. (author), Dresscher, D. (author), van Dijk, W. (author), Stramigioli, S. (author)
Humans have multiple ways to adapt their arm dynamics to the task they have to perform. One way of doing this is through co-contraction of antagonist muscles. In telemanipulation this ability is easily lost due to time delays, quantization effects, bandwidth or hardware limitations. In this work a new concept for telemanipulation is presented....
conference paper 2018
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Tajdari, F. (author), Berkhoff, A.P. (author), de Boer, A. (author)
This paper studies a lumped model of an acoustic source with a relatively small thickness and high bending stiffness. Voice coil and piezoelectric actuators are used to drive moving components of the acoustic source. Feedback and feedforward damping control techniques are used to actively obtain a smooth frequency response, especially at low...
conference paper 2017
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Piras, D. (author), Sadeghian Marnani, H. (author)
Ultrasound atomic force microscopy (US-AFM) has been used for subsurface imaging of nanostructures. The contact stiffness variations have been suggested as the origin of the image contrast. Therefore, to analyze the image contrast, the local changes in the contact stiffness due to the presence of subsurface features should be calculated. So far,...
article 2017
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Martin, A.H. (author), Bakhuizen, E. (author), Ersch, C. (author), Urbonaite, V. (author), de Jongh, H.H.J. (author), Pouvreau, L. (author)
To understand the origin of water holding of mixed protein gels, a study was performed on water exudation from mixed whey protein (WP)-gelatin gels upon applied pressure. Mixed gels were prepared with varying WP and gelatin concentration and gelatin type to obtain gels with a wide range of gel properties. Gels were characterized for their water...
article 2016
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Jose, J. (author), Pouvreau, L. (author), Martin, A.H. (author)
To design food products based on mixtures of proteins from animal and plant sources, understanding of how the structural and mechanical properties of mixed protein systems can benefit from selectively mixing is essential. Heat-induced gels were prepared from mixtures of whey proteins (WP) and soy proteins (SP) at different ratios and constant...
article 2016
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Ho, J.H. (author), Berkhoff, A.P. (author)
This paper presents an acoustic source with a small thickness and high bending stiffness. The high bending stiffness is obtained with a sandwich structure in which the face of the sandwich structure internal to the source is perforated to increase the acoustic compliance, thereby leading to increased electroacoustic conversion efficiency....
article 2015
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Willems, N.M.B.K. (author), Langenbach, G.E.J. (author), Stoop, R. (author), den Toonder, J.M.J. (author), Mulder, L. (author), Zentner, A. (author), Everts, V. (author)
The role of mature collagen cross-links, pentosidine (Pen) cross-links in particular, in the micromechanical properties of cancellous bone is unknown. The aim of this study was to examine nonenzymatic glycation effects on tissue stiffness of demineralized and non-demineralized cancellous bone. A total of 60 bone samples were derived from...
article 2014
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Olieslagers, R. (author), de Wild, M. (author), van Melick, S. (author), Knaapen, R. (author)
The fluid structure interaction for an aerostatic bearing and a substrate is solved numerically by a semi-analytical model, programmed in the software package MATLAB. This semi-analytical model uses a fluidic network of resistances and capacities to solve the pressure field in the bearing channel. These pressures are sent to a mechanical module,...
conference paper 2014
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Rahman, T. (author), IJsselmuiden, S.T. (author), Abdalla, M.M. (author), Jansen, E.L. (author)
Modern fiber placement machines allow laminates with spatially varying stiffness properties to be manufactured. In earlier research, the authors optimized variable stiffness plates for maximum buckling load, demonstrating significant improvements in load-carrying capacity. In aerospace applications, panel structures are often permitted to enter...
article 2011
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Nijenhuis, J.R. (author), Hamelinck, R.F.M.M. (author), Braam, B.C. (author), Cayrel, M. (author), TNO Industrie en Techniek (author)
The largest optical telescope in the world will be the E-ELT. Its primary mirror will be 42m in diameter. This mirror will consist of 984 hexagonal segments that are all individually supported. Each mirror will be controlled in six DOF while local shaping of the segments is provided by so called warping harnesses. These will correct for focus,...
conference paper 2010
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van Vliet, T. (author), van Aken, G.A. (author), de Jongh, H.H.J. (author), Hamer, R.J. (author), TNO Kwaliteit van Leven (author)
Recently, considerable attention has been given to the understanding of texture attributes that cannot directly be related to physical properties of food, such as creamy, crumbly and watery. The perception of these attributes is strongly related to the way the food is processed during food intake, mastication, swallowing of it and during the...
article 2009
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Janssen, G.C.A.M. (author), Abdalla, M.M. (author), van Keulen, F. (author), Pujada, B.R. (author), van Venrooy, B. (author), TNO Industrie en Techniek (author)
Stress in a thin film on a flexible substrate induces a curvature of the substrate. Usually the substrate is orders of magnitude thicker than the film, leading to small and purely elastic deformation of the substrate. In this case, the Stoney equation yields the stress in the film from the measured curvature of the substrate. The Stoney equation...
article 2009
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Qian, S. (author), Zhou, J. (author), de Rooij, M.R. (author), Schlangen, E. (author), Ye, G. (author), van Breugel, K. (author), TNO Bouw en Ondergrond (author)
The self-healing behavior of a series of pre-cracked fiber reinforced strain hardening cementitious composites incorporating blast furnace slag (BFS) and limestone powder (LP) with relatively high water/binder ratio is investigated in this paper, focusing on the recovery of its deflection capacity. Four-point bending tests are used to precrack...
article 2009
Searched for: subject:"Stiffness"
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