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- R. Ansari, Keyhan Hosseini, A. Darvizeh, B. Daneshian
- Applied Mathematics and Computation
- 2013

- R. Ansari, M. Hemmatnezhad
- Mathematical and Computer Modelling
- 2011

Thepresentworkdealswith theproblemof thenonlinear vibrations ofmulti-walled carbon nanotubes embedded in an elastic medium. A multiple-beam model is utilized in which the governing equations of each layer are coupled with those of its adjacent ones via the van der Waals interlayer force. The variational iteration method (VIM) is adopted to obtain the… (More)

- R. Ansari, Rahman Gholami, Keyhan Hosseini, S. Sahmani
- Mathematical and Computer Modelling
- 2011

In the present paper, the free vibration characteristics of nanobeams embedded in an elastic medium are investigated. Inclusion of size effects is considered in the analysis by incorporating Eringen’s nonlocal elasticity continuum into the classical Euler–Bernoulli beam theory. To include the surrounding elastic medium, the Pasternak elastic foundation… (More)

- Christoph Otte, R. Ansari, G. Kovács, M. Sommerauer, Gereon Hüttmann, Alexander Schlaefer
- Bildverarbeitung für die Medizin
- 2011

Kurzfassung. Beim Einbringen von Nadeln in Weichgewebe kommt es zu Bewegungen und Deformationen. Diese beeinträchtigen besonders hochaufgelöste Bildgebungsverfahren mit geringer Eindringtiefe wie die optische Kohärenztomographie, die jedoch auch kleine Strukturen auflösen kann und eine Möglichkeit zur ” optischen Biopsie“ darstellt. Die Korrektur von… (More)

- R. Ansari, Christian Myrtus, Redouane Aherrahrou, Jeanette Erdmann, Achim Schweikard, Gereon Hüttmann
- Optics letters
- 2014

We present an ultrahigh-resolution, high-speed spectral domain optical coherence phase microscopy (SD-OCPM) system that combines submicrometer transverse spatial resolution and subnanometer optical path length sensitivity, with an acquisition speed of over 217,000 voxels/s. The proposed SD-OCPM system overcomes two significant drawbacks of traditional… (More)

- R. Ansari, Christian Buj, Mario Pieper, Peter Koenig, Achim Schweikard, Gereon Hüttmann
- Optics express
- 2015

Motile cilia perform a range of important mechanosensory and chemosensory functions, along with expulsion of mucus and inhaled pathogens from the lungs. Here we demonstrate that spectral domain optical coherence phase microscopy (SD-OCPM), which combines the principles of optical coherence tomography (OCT) and confocal microscopy, is particularly… (More)

- R. Ansari, M. Faghih Shojaei, F. Ebrahimi, H. Rouhi, M. Bazdid-Vahdati
- Engineering with Computers
- 2015

Based on Mindlin’s strain gradient elasticity and Euler–Bernoulli beam theory, a non-classical beam element capable of considering micro-structure effects is developed. To accomplish this aim, the higher-order tensors of energy pairs in the energy functional are vectorized and written in the quadratic representation, from which the stiffness and mass… (More)

This paper presents an efficient method for solving free vibration problems for an Euler-Bernoulli beam under various supporting conditions. The method is based on the implementation of the sixth-order compact finite difference method (CFDM) for discretizing the governing differential equation to obtain the natural frequencies of beam corresponding to two… (More)

- Rabah Al Abdi, Christoph H. Schmitz, +8 authors Randall L. Barbour
- Proceedings of the 2010 IEEE 36th Annual…
- 2010

System design, performance characteristics and representative clinical findings are described for a second generation dynamic near-infrared optical tomography breast imager that examines both breasts simultaneously under conditions of rest and controlled provocation. Novel elements of the system include incorporation of high-density optical sensing heads… (More)

- M. Mirnezhad, R. Ansari, H. Rouhi, M. Faghihnasiri
- IJCCE
- 2013

The application of graphene as a nanosensor in measuring strain through its band structure around the Fermi level is investigated in this paper. The mechanical properties of graphene as well as its electronic structure are determined by using the density functional theory calculations within the framework of generalized gradient approximation. In the case… (More)