Fuel-combustion-based thermophotovoltaic (TPV) systems are emerging as a viable power source for small, portable generators spectrum of applications such UAVs, robotic platforms, and sensors. In TPV systems, an emitter heated to above 1000 K emits radiation that is then converted electricity by low bandgap photovoltaic cell. One promising class emitters two-dimensional photonic crystals (PhCs) ...

Background: 99mTc is a widely used radioisotope in nuclear medicine centers which is obtained by elution from Mo-99/Tc-99m generators. Usually the generators are either supplied by the Iran Atomic Energy Agency or by private companies from foreign countries. In this study we have measured 99Mo contamination in 99mTc elute from different generators in a period of one year. Materials and...

Herein, the one-step fabrication of novel three-dimensional sponge-like piezoelectric electrospun nanofiber structures is reported. Ferroelectric polymers are biocompatible and flexible materials that present attractive opportunities for portable energy harvesters efficient wearable electronic devices. While being compatible with diverse methods, thicker denser 3D forms have only been obtained ...

Given the substitution process of generators using renewable energy sources instead of conventional generators in modern power systems, this paper proposes a Monte Carlo based method to determine an optimal level of this change. At first, LOLE index of the system was calculated without wind power to obtain the reference index. Then, the wind turbine units are replaced with the conventional gene...

permanent magnet synchronous generators (pmsgs) are novel generators which can be used in high-performance wind farms. high efficiency and flexibility in producing electricity from variable rotation make them good candidate for wind power applications. furthermore, because these kinds of generators have no excitation winding, there is no copper loss on rotor; hence, they can operate at high pow...

The development of miniature energy harvesting and storage devices with considerable performance is urgently needed for the increasing demand diverse electronics that require portable wearable functions. With a unique 2D structure, graphene material possesses numerous fascinating physical chemical properties which endow it as promising candidate component or building block to boost such system ...

Changes in the availability and accessibility of alternative energy sources have been observed recent years. This study analyzes economic viability use photovoltaic solar systems equipment for control inspection drinking water pipes. For this, consumption, costs operating times were reviewed using conventional energy. The air conditioning system was found to be outdated needs replaced with a le...

The human-powered self-generator provides the best solution for individuals who need an instantaneous power supply for travel, outdoor, and emergency use, since it is less dependent on weather conditions and occupies less space than other renewable power supplies. However, many commercial portable self-generators that employ hand-cranking are not used as much as expected in daily lives although...