Aquaponics is an innovative technology and a sustainable source of organic food in agriculture that combines aquaculture (fish farming) hydroponics (soilless plant cultivation). To determine the performance strawberry closed loop aquaponics system, experiment was carried out at newly established system Ornamental plants nursery, Department Horticulture, The University Agriculture Peshawar 2019....

We compare open loop versus closed loop identiication when the identiied model is used for control design, and when the system itself belongs to the model class, so that only variance errors are relevant. For three diierent control design criteria (minimum variance, LQG and model reference control) we show that, under those conditions, a better performance is achieved by closing the loop during...

Many designers think of control system feedback loop compensation only in terms of stable or unstable. In reality, there is an optimum error amplifier transfer function for any given loop crossover frequency and phase margin. The optimum design is shown to be the one with the highest gain below crossover and the lowest gain above crossover. There is a unique pole-zero placement to achieve optim...

This paper concerns a robust control design for multi-loop operation of paralleled DC/DC converters in the presence of uncertainties. The system is composed of voltage-loop and current-loop subsystems. The PID controller is firstly designed to achieve the robust stability and robust performance of the voltage-loop. Then, the PI controller for the current-loop is designed to achieve the robust s...

We present a novel, compile-time method for determining the cache performance of the loop nests in a program. The cache-miss rates are produced by applying the program's reference string of a loop nest, determined during compilation, to an architecturally parameterized cache simulator. The obtained cache-miss rates correlate well with the performance of the loop nests on actual target machines....

The mixing behavior of the gas-liquid phase in three loop bioreactors was investigated. A gas-induced External Airlift Loop Bioreactor (EALB), a forced-liquid Vertical Tubular Loop Bioreactor (VTLB) and a forced-liquid Horizontal Tubular Loop Bioreactor (HTLB) were used for mixing studies as well as biomass production from natural gas. The effect of design parameters, riser to downcomer cro...

In the present paper, controller design is performed using lambda tuning method and controller performance is compared for various values of desired closed loop time constant. A blending system, which can be represented as a first order plus dead time model, is selected from literature survey for this analysis. The performance is calculated in terms of rise time, settling time, over shoot (%), ...