The cognitive sensor (CS) can transmit data to the control center in the same spectrum that is licensed to the primary user (PU) when the absence of the PU is detected by spectrum sensing. However, the battery energy of the CS is limited due to its small size, deployment in atrocious environments and long-term working. In this paper, an energy-harvesting-based CS is described, which senses the ...

Energy consumption is one of the primary concerns in the deployment of futuristic wireless sensor networks. On one hand due to advent of technologies such as Internet of Things (IoT), there has been tremendous growth in development of wireless sensor nodes, however, on the other hand these nodes are energy constrained, hence have limited lifetime. Energy harvesting from radio frequency (RF) sig...

A number of studies have recently shown an association between particle concentrations in outdoor air and daily mortality counts in urban locations. In the public health interpretation of this evidence, a key issue is whether the increased mortality associated with higher pollution levels is restricted to very frail persons for whom life expectancy is short in the absence of pollution. This pos...

Articles you may be interested in Piezoelectric energy harvester converting strain energy into kinetic energy for extremely low frequency operation Appl. Energy harvesting from ambient low-frequency magnetic field using magneto-mechano-electric composite cantilever Appl. Frequency up-converted wide bandwidth piezoelectric energy harvester using mechanical impact Nonlinear output properties of c...

Recent advances in fabrication and characterization of nanomaterials have led to the intelligible applications of such nanomaterials in the next generation flexible electronics and the highly efficient photovoltaic devices. Nanotechnology has been used in thin film photovoltaic devices, and is considered as one of the most promising research area in power harvesting applications. Excellent elec...

Wireless nodes in future communication systems are expected to overcome three barriers when compared to their transitional counterparts, namely to support significantly higher data rates, have long-lasting energy supplies and remain fully operational in interference-limited heterogeneous networks. This could be achieved by providing three promising features, which are radio frequency (RF) energ...

This study demonstrates a method for harvesting the electrical power by the piezoelectric actuator from vibration energy. This paper presents the energy harvesting technique using the piezoelectric element of a bimorph type driven by a geared motor and a vibrator. The geared motor is a type of PWM controlled device that is a combination of an oval shape cam with five gears and a speed controlle...

Radio-Frequency Energy Harvesting In article number 2300197, Suk Tai Chang, Sungjoon Lim, and co-workers report that a foldable radio-frequency (RF) energy-harvesting system (RFEH) can be realized by integrating an RF antenna, to direct-current rectifier, supercapacitor within single sheet of paper. This work reveals the potential role paper-based RFEH in applications such as remote powering we...