PAGE 1129 Researchers in China have fabricated a two-colour quantum photodetector with visibly clear double-peak spectral photocurrent response. Two one-colour GaAs/Al-doped GaAs photodetectors were simply grown in serial connectivity as stacked layers to make the reported device. Applications for such two-colour photo detectors include THz spectroscopy and real-time target detection. PAGE 1137 Researchers in India introduce the concept of the ‘internet of photovoltaics’: an efficient method for networking various solar cell power invertors across 200 acres of land. Performance was measured from each invertor using Raspberry Pi computers connected to a common wireless network. Cumulative invertor performance data is calculated across a single network and real-time power generation is reported. A new two-colour quantum photodetector with double-peak spectral photocurrent response has been fabricated PAGE 1092 The integrative pathways of the human brain are mimicked in work from Korea in a new method for detecting and tracking objects. A dual-layered oscillatory model is proposed, which consists of cooperative mathematical functions networked with the same architecture as pathways in the human brain. The authors successfully demonstrate effective and efficient object detection and tracking with this method. Connecting multiple solar cell invertors to a single wireless network for cumulative real-time power data generation PAGE 1085 Work form China proposes a new metamaterial absorber with controllable polarisation and frequency responses. The structure of the fabricated device has an outer ring with inner Jerusalem-cross design and two pin diodes. Simulated and measured responses show changes in device polarisation when the diodes are switched between ON and OFF operating states; thereby demonstrating switchable and controllable frequency absorption. An artificial network for object detection and tracking that mimics the communication pathways in the human brain PAGE 1110 A new method for sensorless control of permanent magnet synchronous machines is proposed by researchers in Germany and the UK. The Direct Flux Control method combats problems associated with existing control technologies by incorporating a mathematically derived linkage signal. This signal contains second and fourth harmonics, from which information on rotor position at all operating speeds can be calculated. Controllable frequency response is demonstrated by a new metamaterial device with switchable polarisation A new sensorless control method for permanent magnet synchronous machines