Point-matching method for reduction of anomalous radiation of log-periodic dipole array

A point matching method is developed for the evaluation of the performance of the log-periodic dipole antenna (LPDA). Based on this method, the anomalous behaviour of the LPDA is studied and found to be improved at an optimum spacing factor and by selecting a small dipole length to diameter ratio; that is, an LPDA, operating over a given frequency band, must possess an optimum dimension that gives a pattern with eliminated anomalous backlobe peaks

A fast VLSI system for computing third order cumulants

A fast concurrent system for computing third order cumulants is presented. The system consists of (q + 1)(q + 2) processing elements (PEs), where q is the maximum lag of third order cumulant sequence. A huge saving in computation time compared to sequential computation is realized. The system performance in terms of the speedup and efficiency is evaluated. The system is suitable for VLSI implementation. © 1995

Outdoor continuous cultivation of self-settling marine cyanobacterium chroococcidiopsis sp.

Spontaneous settling of certain aggregating microalgae or cyanobacteria could potentially alleviate the energy requirement in biomass harvesting. A locally isolated floc-forming marine cyanobacteria, Chroococcidiopsis sp., was initially grown indoor to study its self-settling efficiency; 97% of the biomass settled spontaneously in 1 h. Later, the strain was grown in outdoor raceway tanks (1 square meter) for 70 d. Every alternative day, 50% of the culture was harvested by self-settling, and the supernatant was recycled back to the tank. Average biomass productivities for the strain was 16.08 g/m2/d. The biomass had an average 2.26% water extractable phycobiliproteins that comprised of both phycocyanin (11.4 mg/g) and phycoerythrin (10.6 mg/g). Since Chroococcidiopsis sp. biomass can be harvested very efficiently, it would reduce the energy and cost of biomass production which are deemed necessary for microalgal animal feed and biofuel applications. Furthermore, its ability to produce high-value pigments will also make it economically very attractive from biorefinery approach. Copyright 2018, Mary Ann Liebert, Inc. 2018.The authors would like to acknowledge the support of Qatar National Research Fund (QNRF, a member of Qatar Foundation) for providing the funding (under grant NPRP8-646-2-272) for this study.Scopu