Rhinoentomophthoromycosis

A rare case of Rhinophycomycosis entomophthora treated with a combination of Bacterium, potassium iodide and steroid is reported. Clinical features, epidemiology, mycology, and management are discussed.     

Gain-loss measurements on a carbon-fibre composite reflector antenna

The loss of gain due to surface-current attenuation on an uncoated carbon-fibre-reinforced-plastics reflector antenna has been investigated by comparing an uncoated antenna with the same unit with the addition of a metallised surface. The measurements show that the gain loss of the test antenna is of the order of 0.5 dB at X band frequencies.     

Charge-splitting c.c.d. tapped delay lines

Two new types of c.c.d. tapped delay lines are described. One has parallel channels separated by channel stops from input to output. The other has channel stop wedges partitioning charge packets down the device. High performance is achieved.     

A dual-mode internal window management device for energy conservation

The design of a simple energy conserving window management system is described, and its heat transfer characteristics are calculated. The device serves as a quasi-active solar collector during winter daytime, provides added insulation comparable with that of vented storm windows during winter nighttime, and rejects solar heat during summer cooling periods. The problem of avoiding the intensity of direct sun through windows while obtaining essentially all the associated heat is effectively solved with a window system of this type. The results of the numerical modeling show that the dual shade:will be approximately 90% as energy efficient as an unshaded window while intercepting direct sunlight;will save about 40% on energy losses through a single pane window during winter nighttime;will reduce solar heat gain by about 70% during peak-power summer air conditioning periods.     

Nonreciprocal representation of the floating inductor with grounded-amplifier realisations

The floating inductor is approximated to by the nonreciprocal transmission matrix (1, Ls; 1/R, 1), where L = CR2 with R sufficiently large and CR2 constant. Representations of this matrix are obtained by a form of synthesis procedure and are realised with only one type of grounded operational amplifier. Results are given which show their performance in a lowpass filter.     

Simple impedance transforming feed system for low-gain quadrifilarand bifilar satellite terminal antennas

An impedance transforming balun feeder system has been devised for low-gain antennas such as quadrifilar helices and spirals, consisting of four coaxial cables and a microstrip circuit. The arrangement allows physically orthogonal `balanced pair' outputs with quadrature phasing, in space limited configurations