Two commercial photodiodes are tested for two-photon absorption at 520 nm. The results indicate strong linear absorption and negligible two-photon absorption at current power level. Two major types of error associated with autocorrelation measurement based on two-photon induced photocurrent were identified and investigated. Computer simulations show linear absorption can significantly distort t...

A t w o-eye visual environment is used in training a network of BCM neurons. We study the eeect of misalignment b e t w een the synaptic density functions from the two e y es, on the formation of orientation selectivity and ocular dominance in a lateral inhibition network. The visual environment w e use is composed of natural images. We show that for the BCM rule a natural image environment wit...

A two-eye visual environment is used in training a network of BCM neurons. We study the effect of misalignment between the synaptic density functions from the two eyes, on the formation of orientation selectivity and ocular dominance in a lateral inhibition network. The visual environment we use is composed of natural images. We show that for the BCM rule a natural image environment with binocu...

A novel statistical channel model for multiple-input multiple-output (MIMO) free-space optical (FSO) communication systems impaired by atmospheric and misalignment fading is developed. A slow-fading channel model is considered and the outage probability is derived as a performance measure. The diversity gain defined as the signal-to-noise ratio (SNR) exponent at high SNR is analyzed. Interestin...

Fourier ptychographic microscopy (FPM) is a newly developed computational imaging technique that can provide gigapixel images with both high resolution (HR) and wide field of view (FOV). However, the position misalignment of the LED array induces a degradation of the reconstructed image, especially in the regions away from the optical axis. In this paper, we propose a robust and fast method to ...

Two of the most common defects in rotating systems are abnormal wear of the bearing bushing and bearing misalignment. The present paper introduces a new fault diagnosis model that uses artificial neural networks (ANN) in order to identify the increase of wear depth and/or the increment of the misalignment angle. Reynolds equation is solved by FEM and provides data about bearing wear and misalig...

Misalignment and unbalance are the major concerns in rotating machinery. When the power supply to any rotating system is cutoff, the system begins to lose the momentum gained during sustained operation and finally comes to rest. The exact time period from when the power is cutoff until the rotor comes to rest is called Coast Down Time. The CDTs for different shaft cutoff speeds were recorded at...

We study some effects of cell misalignments in accelerator structures in which each cell is displaced the same amount and direction but with sign which alternates from cell to cell. In particular we study the manifold radiation in a damped detuned structure (DDS1) and wakefield effects in a uniform constant impedance structure. A synchronous wave aliasing phenomenon is observed. In previous tre...

Misalignment is a problematic challenge in RF MEMS resonators. It causes asymmetry in the ultra symmetric radial contour mode disk resonators and degrades their performance by increasing the insertion loss and decreasing their quality factors (Q). Self-alignment method seems to be a good solution for misalignment problem, but it cannot be directly applied on high performance ring shape anchored...

In contrast to objects of relatively simple shapes, it is diflault to extract geometrical informations fiom objects of complicated shapes and thus their assembly requires complete information about a misalignment between mating parts. This motivates development of a new sensing method for detecting the misalignment. In this paper, we propose a new omnidirectional image sensing system for assemb...