The transport/diffusion system considering the control of tracer concentration in a tubular reactor with relevant transport delay is widely used in the area of environmental engineering. They are ...

Solar energy is becoming increasingly attractive as we grapple with global climate changes. However, while solar energy is free, non-polluting, and inexhaustible, solar panels are traditionally fixed.

For optimal efficiency, solar panels should be perpendicular to sunlight where the illumination is strongest. But since the direction of sunlight changes during the course of a day – and from season ...