The design of frequency-tunable amplifiers is investigated and the tradeoff between linearity, efficiency and tunability is revealed. Several tunable amplifiers using various varactor diode topologies as tunable devices are designed by using loadpull techniques and their performances are compared. The amplifier using anti-series distortion-free varactor stack topology achieves 38% power added e...

The paper first introduces phased array configurations for radar and astronomy applications. In radar various trends can be observed, on the one hand driven by cost issues and on the other hand by increasing performance demands. The trends discussed, are the increasing bandwidth, the improvement of the Power Added Efficiency of transmit/receive modules, the phase shifter technology, alternative...

A class E power amplifier including coupling coils is proposed for application in a wireless power transfer system using magnetic coupling. The proposed amplifier is directly connected to the coils with no discrete components for harmonic filtering and dc feeding, which could cause efficiency degradation of the amplifier. The system with the differential amplifier shows 6.95 W of transmitted po...

Hair ingested by licking during cat grooming can eventually coalesce into solid masses in cat gastrointestinal tract. It is believed that dietary fibre might reduce formation of these trichobezoars (hairballs). The effects of two insoluble fibre sources added to kibble diets were evaluated with respect to trichobezoar faecal excretion. Thirty-two cats and four diets were used in a randomised bl...

Reductants (0.1-2.0% ascorbic acid, cysteine, or cystine and 0.04-1. 0% beta-mercaptoethanol) were added to 5-fold diluted, salted duck egg whites (commercially and laboratory prepared) and fresh egg whites (chicken and duck), and subsequently the mixtures were heated at 70 degrees C for 1-10 min. The maximal recovery and purification fold of lysozyme obtained from fresh chicken egg whites adde...

Treatments were arranged in a 3 × 3 × 3 factorial design consisting of 3 levels of added fiber (0, 2 and 4% oat hulls), added moisture (0, 2 and 4% tap water) and added protein (0, 2 and 4% soybean meal). Fiber, moisture and/or protein were added to a corn/soybean based basal diet that was formulated to Cobb specifications. Feed was manufactured at the West Virginia University pilot feed mill u...

Test 0 2 $ 7 10 16 19 Hb added, 200 ,.Lg/g Hemoccult II 0.2/0.2 0.4/0.1 0.4/0.0 0.4/0.0 0.3/0.0 0.0/0.0 0.3/0.0 Hemoccult SENSA 0.7/0.6 0.8/0.3 1.0/0.4 0.6/0.2 0.7/0.2 0.6/0.0 0.2/0.0 Hb added, 400 i-’-g/g Hemoccult II 1.2/1.2 1.2/0.1 1.2/0.2 1.5/0.0 1.4/0.0 1.3/0.0 1.4/0.0 Hemoccult SENSA 1.7/1.6 1.9/0.6 1.6/0.5 1.6/0.2 1.5/0.2 1.5/0.2 1.2/0.2 Hb added, 1000 Lg/g Hemoccult II 2.3/2.5 2.2/0.9 2...