The ability to dissipate large fractions of their absorbed light energy as heat is a vital photoprotective function of the peripheral light-harvesting pigment-protein complexes in photosystem II of plants. The major component of this process, known as qE, is characterised by the appearance of low-energy (red-shifted) absorption and fluorescence bands. Although the appearance of these red states...

The near-unity efficiency of energy transfer in photosynthesis makes photosynthetic light-harvesting complexes a promising avenue for developing new renewable energy technologies. Knowledge of the energy landscape of these complexes is essential in understanding their function, but its experimental determination has proven elusive. Here, the observation of quantum coherence using two-dimensiona...

Energy harvesting by using piezoelectric materials is one of the most widely used techniques for conversion waste energy into useful. Using this technique, generated vibration from machines can be converted useful electrical energy. In paper, an system that supplies power low-power consumption devices has been designed. The experimental model consists a rotating machine generates mechanical vib...

The object of this study was evaluation of a walking tractor drawn peanut harvester at different conditions of soil moisture content and forward speed and comparing it with manual harvesting. The evaluation factors for peanut harvester were two levels of soil moisture content and three levels of forward speed. The results revealed that the effect of soil moisture content was only significant on...

Power supply is a bottle-neck problem of wireless micro-sensors, especially where the replacement of batteries is impossible or inconvenient. Now piezoelectric material is being used to harvest vibration energy for self-powered sensors. However, the geometry of a piezoelectric cantilever beam will greatly affect its vibration energy harvesting ability. This paper deduces a remarkably precise an...

Harvesting of ambient radio-frequency energy is largely covered in the literature. The RF harvester considered most time as a standalone board. There an interest to add harvesting function on already-designed object. Polymer objects are here, manufactured through additive process and paper focuses rapid prototyping using plastronic approach. An array four antennas for circular polarization with...