Experiments to generate squeezed states of light are described for a collection of two-level atoms within a highfinesse cavity. The investigation is conducted in a regime for which the weak-field coupling of atoms to the cavity mode produces a splitting in the normal mode structure of the atom-field system that is large compared with the atomic linewidth. Reductions in photocurrent noise of 30%...

The performance of a conventional intensity modulation direct detection analog optical links is limited by the high noise power associated with large optical carrier power. This optical carrier can be suppressed by using optical frequency modulation in conjunction with a frequency discriminator. In this paper, we propose a design of an integrated optical frequency discriminator, based on optica...

The most basic stochastic epidemic models are those involving global transmission, meaning that infection rates depend only on the type and state of the individuals involved, and not on their location in the population. Simple as they are, there are still several open problems for such models. For example, when will such an epidemic go extinct and with what probability (questions depending on t...

A real−time adaptive rate control algorithm for video transmission is presented. The proposed algorithm aims to determine the optimal rate at which the video should be sent through the network in order to minimize the expected distortion while meeting the delay requirements. The packet loss rate is assumed to be a function of the transmission rate. The nodes of the network over which video pack...

Fixed-basis and variable-basis approximation schemes are compared for the problems of function approximation and functional optimization also known as infinite programming . Classes of problems are investigated for which variable-basis schemes with sigmoidal computational units perform better than fixed-basis ones, in terms of the minimum number of computational units needed to achieve a desire...

A critical objective of cognitive radio (CR) system is to enhance the spectrum efficiency, and one of the key factors that can determine the spectrum efficiency is the system spectrum sensing performance with respect to sensing window length. For non-coherent detection-based sensing technique, the length of the sensing window required to meet the detection criteria is inversely proportional to ...

this study investigated the effect, on reactor performance and biomass retention inside the bed, of the material used to make the supports of anaerobic fixed-bed reactors. three inert supports of similar shape but made of three different materials polyvinyl chloride, polypropylene, high-density polyethylene were manufactured and used. all three supports had the same specific surface area but di...

BACKGROUND There has been considerable debate in the public policy arena about the appropriate mix of regulatory enforcement and consultation in achieving desired health and safety behavior across industries. Recently there has been a shift in federal policy toward voluntary approaches and constraining the scope of enforcement programs, although there is little evidence that this might improve ...

Cooperative relaying is accepted as a promising solution to achieve high data rates over large areas in the future 4G wireless system. In this paper, an adaptive cooperative relay selection algorithm (ACRSA) is presented for fixed relay based cellular networks. According to current user density in a certain cell, when two-hop transmission is adopted, ACRSA adapts selectively between two differe...