We investigated the temporal evolution of light-induced scattering in LiNbO(3):Fe, In crystals with different doping concentrations. A special behavior of the beam fanning was found when the intensity of the incident light was relatively weak. In this case the beam fanning became stronger at the beginning of the illumination and then was greatly reduced, which was observed only at strong incide...

The study of the behavior of means under equal increments of their variables provides a new approach to Ky Fan-type inequalities. Via this new approach we are able to prove some new results on Ky Fan-type inequalities.

A conjecture of Fan and Raspaud [3] asserts that every bridgeless cubic graph contains three perfect matchings with empty intersection. Kaiser and Raspaud [6] suggested a possible approach to this problem based on the concept of a balanced join in an embedded graph. We give here some new results concerning this conjecture and prove that a minimum counterexample must have at least 32 vertices.

Purpose: Speech perception in participants with auditory neuropathy (AN) was systematically studied to answer the following 2 questions: Does noise present a particular problem for people with AN? Can clear speech and cochlear implants alleviate this problem? Method: The researchers evaluated the advantage in intelligibility of clear speech over conversational speech in 13 participants with AN....

We present a simple explicit construction giving unbounded fan-in circuits with $o(n)$ gates and depth $O(r)$ for the threshold function of $n$ variables when the threshold is at most $(log n)^r$, for any integer $r>0$. This improves a result of Atjai and Ben-Or, who showed the existence of circuits of size $n^{O(1)}$. This is the highest threshold for which polynomial-size, constant-depth circ...

We present detailed calculations of the temporal and spatial evolution of beam fanning in photorefractive crystals that is initiated by scattering from noise. We show that fanning starts from beam coupling between the incident radiation and part of the incident radiation scattered by noise at or near the input plane. We show that scattering within the volume of the crystal has negligible effect...

A transient grating is induced at t = 0 in an optically thin caesium vapour sample using two simultaneous intense short laser pulses which are resonant with the fundamental 6S1/2– 6P1/2 transition and characterized by the wavevectors E k1 and E k2. These pulses are followed by a third resonant excitation pulse at t = τ with wavevector E k3. Prompt and delayed super-radiant emissions follow with...

Models have been developed for static pressure and potential supply fan energy savings by using variable speed drive (VSD) in dual-duct constant volume systems. Experiments have been performed using a full size dual-duct constant volume system installed in a 68,000 ft (6,317 m) office and classroom building. The measured static pressure variations and the energy savings agree with the model pro...