2,702 research outputs found
Mathematical modelling of magnetoencephalographic data
No full textHeethaar, R.M. [Promotor]Munck, J.C. de [Copromotor
Geometry, optics and mechanical modelling of the human lens during accommodation : Towards developing an accommodative intraocular lens
No full textHeethaar, R.M. [Promotor]Heijde, G.L. van der [Copromotor
Mechanical behaviour of the intervertebral disc under sustained compressive loading
No full textHeethaar, R.M. [Promotor]Dieen, J.H. van [Promotor]Smit, T.H. [Copromotor]Mullender, M.G. [Copromotor
Myocardial strain, torsion and untwisting in the normal and failing heart measured with magnetic resonance imaging
No full textRossum, A.C. van [Promotor]Heethaar, R.M. [Promotor]Marcus, J.T. [Copromotor]Götte, M.J.W. [Copromotor
Optical properties of the human cornea : Shape and wave aberration measurements using the VU topographer and Scheimpflug photography
No full textIn this study, the optical properties of the human cornea was investigated. Two major developments were made because current measurement techniques need improvement First, the VU topographer, which uses a color coded pattern, was validated with real eye data showing better performance compare to commercial ring topographers particularly in reconstructing the non-rotation symmetric features of the anterior corneal surface. For example, ring topographers underestimate astigmatism of the anterior corneal surface by 4%. This underestimation increases with complexity of the surface. The astigmatism underestimation was found to be 13% for a post radially-keratotomized cornea. Second, the aberration contribution of the posterior surface was revealed using Scheimpflug photography. Results show that the contribution of the posterior surface to corneal coma aberration is negligible. On the other hand, on average the posterior surface decreases corneal astigmatism by 31%. Also the contribution of the posterior surface to the spherical aberration of the cornea increase with age reaching up to 15% at age 65. Thus, measurement of the posterior surface is necessary to specify corneal astigmatism and spherical aberration accurately. The methods introduced in this study are useful for applications in laser refractive surgery, contact lens fitting and studies on wave aberration of the eye because it reveals the optical properties of the cornea more accurately.Heethaar, R.M. [Promotor]Heijde, G.L. van der [Copromotor]Berg, T.J.T.P. van den [Copromotor
Myocardial deformation measured with Magnetic Resonance Tagging; tactics for two- and three-dimensional strain analysis in the human heart.
No full text
R.M. Simmons presentation, Rena Smart book review
No full textR.M. Simmons of the Gospel Music Workshop of America gives a presentation on the African influence in the African American religious experience. He explains how African slaves brought to America their concept of music (utilitarian concept of music). Simmons further discusses the fusion between the utilitarian concept and the Western concept of religion resulting in spirituals. He also describes hymn categories in early forms of formal African American worship experiences. Simmons takes questions from the audience among which is Dr. Riggins Earl Jr. Video concludes with a book review on Christian Theology and Ethics by Rena Smart.The Atlanta University Center Robert W. Woodruff Library acknowledges the generous support of the National Endowment for Humanities - Humanities Collections and Reference Resources Implementation Project Grant in supporting the processing and digitization of a number of its major archival collections as part of the project: Spreading the Word: Expanding Access to African American Religious Archival Collections at the Atlanta University Center Robert W. Woodruff Library.</em
Velocity-Gradient Probability Distribution Functions in a Lagrangian Model of Turbulence
No full textThe Recent Fluid Deformation Closure (RFDC) model of lagrangian turbulence is recast in path-integral language within the framework of the Martin-Siggia-Rose functional formalism. In order to derive analytical expressions for the velocity-gradient probability distribution functions (vgPDFs), we carry out noise renormalization in the low-frequency regime and find approximate extrema for the Martin-Siggia-Rose effective action. We verify, with the help of Monte Carlo simulations, that the vgPDFs so obtained yield a close description of the single-point statistical features implied by the original RFDC stochastic differential equations
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