Abstract Energy conservation and development are critical activities across countries. Optimum energy use ensures and protects the environment. In this work, we designed a solar energy system using photovoltaic cells. The use of photovoltaic cells helps the conversion of energy into electricity.... Energy conservation and development are critical activities across countries. Optimum energy use ensures and protects the environment. In this work, we designed a solar energy system using photovoltaic cells. The use of photovoltaic cells helps the conversion of energy into electricity. Read More Read Less

Abstract The automatic control of draglines has an edge over the manual control including greater efficiency. In this work, we advocated a simplified control strategy based on the linearization of the dynamic model combined with trajectory tracking and linear feedback control law. Using Lagrange formalism, we introduced the design which was tested in our work.... The automatic control of draglines has an edge over the manual control including greater efficiency. In this work, we advocated a simplified control strategy based on the linearization of the dynamic model combined with trajectory tracking and linear feedback control law. Using Lagrange formalism, we introduced the design which was tested in our work. Read More Read Less

Abstract Global path planning is an issue for which we advocated a new metaheuristic approach. This process has a combination of the search space separation capabilities of the Quadtree method and the optimisation capabilities of the Harmony Search method. After the proposition, we tested it and found it more efficient and resulting in high convergence.... Global path planning is an issue for which we advocated a new metaheuristic approach. This process has a combination of the search space separation capabilities of the Quadtree method and the optimisation capabilities of the Harmony Search method. After the proposition, we tested it and found it more efficient and resulting in high convergence. Read More Read Less

Abstract A microwave bandpass filter with a large ratio between the output and the input impedance has been designed and fabricated. Consequently, it functions both as a voltage transformer and a bandpass filter or transfilter for brevity. It represents a two-port micro-acoustic resonator employing Lamb waves in a thin piezoelectric AlN film grown onto a Si carrier substrate with a center... A microwave bandpass filter with a large ratio between the output and the input impedance has been designed and fabricated. Consequently, it functions both as a voltage transformer and a bandpass filter or transfilter for brevity. It represents a two-port micro-acoustic resonator employing Lamb waves in a thin piezoelectric AlN film grown onto a Si carrier substrate with a center frequency of around 887 MHz. The transfilter has a transformer ratio of 10 and a voltage efficiency over 80%. The component has a small size (<0.5 mm2) and is shown to sustain power levels of 250 mW. It can be used in a variety of cases where both voltage amplification and frequency filtering are required. Examples include: charge pumps in RFID tags, energy scavenging, remotely triggered switches, wake-up radios in wireless networks, stand-by units in home electronics, etc. Read More Read Less