Topic
Power density
About: Power density is a research topic. Over the lifetime, 9534 publications have been published within this topic receiving 197264 citations. The topic is also known as: volumic power & volume power density.
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TL;DR: In this article, MnO2 nanoparticles uniformly distributed and tightly anchored on graphene are prepared using an ethanol-assisted graphene sacrifice reduction method, producing composite electrodes with tunable energy density (up to 12.6 Wh kg−1) and power density ( up to 171 kW kg− 1) via rational design of the oxide/graphene ratio.
Abstract: MnO2 nanoparticles uniformly distributed and tightly anchored on graphene are prepared using an ethanol-assisted graphene-sacrifice reduction method, producing composite electrodes with tunable energy density (up to 12.6 Wh kg−1) and power density (up to 171 kW kg−1) via rational design of the oxide/graphene ratio.
71 citations
TL;DR: In this article , bismuth-based high entropy compound (HEC), Bi(Zn 0.2Mg0.2Sn0.1)O3 (BZMASZ), was introduced into BaTiO3-Na 0.5Bi0.3 (BT-NBT) matrix, in order to improve the comprehensive energy storage performance.
71 citations
TL;DR: The first 10 GHz power performance of AlGaN/GaN HEMTs on silicon substrate is reported in this paper, where a maximum current density of 850'mA/mm and an extrinsic transconductance of 220'mS/mm are achieved.
Abstract: The first 10 GHz power performance of AlGaN/GaN HEMTs on silicon substrate is reported. Molecular beam epitaxy grown AlGaN/GaN heterostructure and field-plate gates with 0.3 µm length are employed to fabricate the devices on 2-inch Si (111) substrates. A maximum current density of 850 mA/mm and an extrinsic transconductance of 220 mS/mm are achieved. Load pull measurements at 10 GHz demonstrate a continuous-wave output power density of 7 W/mm, which is the highest power density reported to date for an Si-based transistor. A peak power added efficiency of 52% is achieved for these devices at 10 GHz.
71 citations
TL;DR: In this article, a model is developed to predict the power generation based on the temporal change in temperature of the material, and the measured and predicted power measurements are compared, where the maximum power density of 0.36mW/cm 2 is calculated with PMN-PT.
Abstract: This article considers pyroelectric energy harvesting using piezoelectric materi- als such as PZT-5A, PMN-PT, PVDF, and thin-films. A model is developed to predict the power generation based on the temporal change in temperature of the material. The measured and predicted power measurements are compared, where the maximum power density of 0.36mW/cm 2 is calculated with PMN-PT. The predicted peak power density under similar boundary conditions for thin-film lead scandium tantalate is over 125mW/cm 2 . The study concludes that the power density is highly dependent upon the surface area and the pyroelectric coefficient of the material, underlining the importance of maximizing these parameters.
71 citations
TL;DR: In this article, an improved understanding of the factors that control axial focus of applied-B ion diodes was obtained from time-resolved diagnostics of ion-beam trajectories.
Abstract: An improved understanding of the factors that control the axial focus of applied‐B ion diodes was obtained from time‐resolved diagnostics of ion‐beam trajectories. This resulted in a new selection of anode shape that produced a proton focus of 1.3‐mm diameter from a 4.5‐cm‐radius diode, which is a factor of 2 improvement over previous results. We have achieved a peak proton power density of 1.5±0.2 TW/cm2 on the 1‐TW Proto I accelerator. The radial convergence of this proton beam, defined as the ratio of the anode diameter to focused beam FWHM, is 70. Time‐resolved information about virtual cathode evolution, the self‐ and applied‐magnetic‐field bending, and the horizontal focus of the beam was also obtained. In addition, the diffusion of the magnetic field into the anode plasma is estimated by measuring the horizontal focal position as a function of time. Finally, we discuss the effects of gas cell scattering on the beam focus.
71 citations