12 research outputs found
Renewable Hybrid Power Generation System
Abstract— In parallel to developing technology, demand for more energy makes us seek new energy sources. Wind and solar energy are the most popular ones owing to their abundance, ease of availability and convertibility to electric energy. This work covers realization of a hybrid renewable energy system. The scheme involves conversion of solar power and wind power into usable electrical energy using solar panel and by designing a wind turbine with appropriate calculations and specifications. Battery in this system is charged by both solar and wind power, the DC output is then converted to AC using an inverter and fed to the load. The idea of water conservation through rain water collection and storage with the use of solar panel is also implemented. The main aim of the design is to create a system suitable to provide continuous power by utilization of non-conventional energy resources and making use of the additional advantage of the solar panel in the conservation of water. Power resources and load in the system are monitored and controlled in real time
Magnetic anisotropy reversal driven by structural symmetry-breaking in monolayer {\alpha}-RuCl3
Layered {\alpha}-RuCl3 is a promising material to potentially realize the
long-sought Kitaev quantum spin liquid with fractionalized excitations. While
evidence of this exotic state has been reported under a modest in-plane
magnetic field, such behavior is largely inconsistent with theoretical
expectations of Kitaev phases emerging only in out-of-plane fields. These
predicted field-induced states have been mostly out of reach due to the strong
easy-plane anisotropy of bulk crystals, however. We use a combination of
tunneling spectroscopy, magnetotransport, electron diffraction, and ab initio
calculations to study the layer-dependent magnons, anisotropy, structure, and
exchange coupling in atomically thin samples. Due to structural distortions,
the sign of the average off-diagonal exchange changes in monolayer
{\alpha}-RuCl3, leading to a reversal of magnetic anisotropy to easy-axis. Our
work provides a new avenue to tune the magnetic interactions in {\alpha}-RuCl3
and allows theoretically predicted quantum spin liquid phases for out-of-plane
fields to be more experimentally accessible
Bromine as a Preferred Etchant for Si Surfaces in the Supersaturation Regime: Insights from Calculations of Atomic Scale Reaction Pathways
Etching of semiconductors by halogens
is of vital importance in
device manufacture. A greater understanding of the relevant processes
at the atomistic level can help determine optimal conditions for etching
to be carried out. Supersaturation etching is a seemingly counterintuitive
process where the coverage of the etchant molecules on the surface
to be etched is >1. Here we use density functional theory computations
of reaction pathways and barriers to suggest that supersaturation
etching of Si(001) by Br<sub>2</sub> should be more effective than
conventional etching by Br<sub>2</sub>, as well as both conventional
and supersaturation etching by Cl<sub>2</sub>. Analysis of our results
shows that this is due in part to the larger size of bromine atoms,
and partly due to Br–Si bonds being weaker than Cl–Si
bonds. We also show that, for both conventional and supersaturation
etching, the barrier for the rate-limiting step of desorption of SiX<sub>2</sub> units is lower when the halogen X is Br rather than Cl. This
contributes to the overall reaction barrier for supersaturation etching
being lower for Br<sub>2</sub> than for Cl<sub>2</sub>