The instrumentation of high-speed imaging has been a challenge for scanning probe-based technologies. Mechanical stability of the system, surface tracking at sharp topographic transitions and prolonging tip lifetime have been the determining factors for practical applications. In this paper we report a new type of feedback control based on the torsional resonance amplitude (TRmode ) of cantilev...

The aim of this work is to develop an experimental method to measure in-plane surface properties on the nanometer scale by torsional resonance mode atomic force microscopy and to understand the underlying system dynamics. The invention of the atomic force microscope (AFM) and the advances in development of new AFM based techniques have significantly enhanced the capability to probe surface prop...

PURPOSE To observe torsional movements of the eye in refractive surgery, and their possible consequences in the surgery outcome. METHODS In a prospective study, 49 eyes of 40 patients were submitted to surgical correction of astigmatism, by the LASIK technique. Patients were divided in two groups based on the cylindric power. Group A from -0.25 to -2.00D; group B from -2.25 to -6.00D. The occ...

in this paper, scattering of a plane and monochromatic electromagnetic wave from a nano-wire is simulated using surface integral equations. first, integral equationsgoverning unknown fields on the surface is obtained based on stratton-cho surface integral equations. then, the interaction of the wave with a non-plasmonic as well as a palsmonic nano-wire is considered. it is shown that in scatter...

Acoustic wave devices have gained enormous interest for sensor applications. In the current practice, the surface acoustic waves are usually generated and measured by piezoelectric transducers. In this work, however, we propose to generate the acoustic waves by using a magnetostrictive transducer using magneticstrictive nickel strip gratings and a sensing coil. The coil encircling the gratings ...

We consider the regime in which the bands of the torsional acoustic (TA) and the hydrogen-bond-stretch (HBS) modes of the DNA interpenetrate each other. Within the framework of a model that accommodates the structure of the double helix, we find the three-wave interaction between the TA-and the HBS-modes, and show that microwave radiation could bring about torsional vibrations that could serve ...

The propagation of elastic waves along composite wire rope is considered. The rope is modeled as co-axial layers of cylindrically anisotropic material. Simple kinematical assumptions lead to a ‘‘rod theory’’ for the wire rope, consisting of three coupled onedimensional wave equations. Solutions of these equations are found. Results for a particular aluminum conductor steel reinforced (ACSR) con...

The lower frequency rQ 2-branch of the torsional split rotational spectrum of H OO H has been recorded for the first time near 1.05 THz with Doppler limited resolution employing a Backward Wave Oscillator as the radiation source. The position of the Q-branch lines can be predicted very closely from a set o f effective rotational constants derived individually for the two torsionally split level...

We characterize the linear viscoelastic shear properties of an aqueous wormlike micellar solution using diffusing wave spectroscopy (DWS) based tracer microrheology as well as various mechanical techniques such as rotational rheometry, oscillatory squeeze flow, and torsional resonance oscillation covering the frequency range from 10(-1) to 10(6) rad/s. Since DWS as well as mechanical oscillator...

Asymptotically exact and nonlocal third order nonlinear evolution equations are derivedfor two counterpropagating surface capillary gravity wave packets in deep water in thepresence of wind flowing over water.From these evolution equations stability analysis ismade for a uniform standing surface capillary gravity wave trains for longitudinal perturbation. Instability condition is obtained and g...