299 research outputs found
A study on the piscifauna of the Idukki Reservoir and catchment area
From the area under report 17 species, 15 endemic and 2 exotic, of freshwater fish have been identified. Of these, 8 species are commonly found in the catches and are of fishery significance. The fact that small fish species which have no fishery importance also support life in other trophic levels of this ecosystem is well exemplified by the interaction of the birds and mammals with these species. A scientific management and monitoring of the reservoir waters as well as the remaining segments of forests are recommended to salvage the wild life and vegetation from a possible rapid deterioration within years
Engineering bound states in continuum via nonlinearity induced extra dimension
Bound states in continuum (BICs) are localized states of a system possessing
significantly large life times with applications across various branches of
science. In this work, we propose an expedient protocol to engineer BICs which
involves the use of Kerr nonlinearities in the system. The generation of BICs
is a direct artifact of the nonlinearity and the associated expansion in the
dimensionality of the system. In particular, we consider single and two mode
anharmonic systems and provide a number of solutions apposite for the creation
of BICs. In close vicinity to the BIC, the steady state response of the system
is immensely sensitive to perturbations in natural frequencies of the system
and we illustrate its propitious sensing potential in the context of
experimentally realizable setups for both optical and magnetic nonlinearities.Comment: 7 pages, 4 figure
Impact of Seasonal Changes on Water Characterstics at Palakkad in 2021-2022
Geometric increase in population coupled with rapid urbanization, industrialization and agricultural development has resulted in high impact on quality and quantity of water in India. Hence, the availability and the quality of the freshwater resources are the most pressing of the many environmental challenges in India (CPCB 2011). The quality of water is of vital concern for mankind, since it is directly linked with human welfare. Poor quality of water adversely affects the plant growth and human health (WHO 1984; Hem 1985). A number of studies on water quality have been carried out in different parts of India All these studies reveal that both rivers and groundwater in India are facing water quality issues.
The state of Kerala, located in the south-western corner of India, is blessed with 44 rivers and heavy rainfall of ~ 3000 mm/year. However, most of the water in the rivers is quickly drained into the Arabian Sea due to the steep seaward sloping of the state. Hence, in addition to rivers, the groundwater is also utilized to meet the water requirements of the state. The increase in population, development activities, urbanization, change in land-use pattern, etc. has created a concern among the people of Kerala regarding both the river water and groundwater quality of various river basins
Quantum amplification of spin currents in cavity magnonics by a parametric drive induced long-lived mode
Cavity-mediated magnon-magnon coupling can lead to a transfer of spin-wave
excitations between two spatially separated magnetic samples. We enunciate how
the application of a two-photon parametric drive to the cavity can lead to
stark amplification in this transfer efficiency. The recurrent multiphoton
absorption by the cavity opens up an infinite ladder of accessible energy
levels, which can induce higher-order transitions within the magnon Fock space.
This is reflected in a heightened spin-current response from one of the
magnetic samples when the neighboring sample is coherently pumped. The
enhancement induced by the parametric drive can be considerably high within the
stable dynamical region. Specifically, near the periphery of the stability
boundary, the spin current is amplified by several orders of magnitude. Such
striking enhancement factors are attributed to the emergence of parametrically
induced strong coherences precipitated by a long-lived mode. While
contextualized in magnonics, the generality of the principle would allow
applications to energy transfer between systems contained in parametric
cavities
Topological transitions in dissipatively coupled Su-Schrieffer-Heeger models
Non-Hermitian topological phenomena have gained much interest among
physicists in recent years. In this paper, we expound on the physics of
dissipatively coupled Su-Schrieffer-Heeger (SSH) lattices, specifically in
systems with bosonic and electrical constituents. In the context of electrical
circuits, we demonstrate that a series of resistively coupled LCR circuits
mimics the topology of a dissipatively coupled SSH model. In addition, we
foreground a scheme to construct dissipatively coupled SSH lattices involving a
set of non-interacting bosonic oscillators weakly coupled to engineered
reservoirs of modes possessing substantially small lifetimes when compared to
other system timescales. Further, by activating the coherent coupling between
bosonic oscillators, we elucidate the emergence of non-reciprocal dissipative
coupling which can be controlled by the phase of the coherent interaction
strength precipitating in phase-dependent topological transitions and skin
effect. Our analyses are generic, apropos of a large class of systems
involving, for instance, optical and microwave settings, while the circuit
implementation represents the most straightforward of them.Comment: 10 pages, 9 figure
A Metamaterial Backed Dipole Antenna for High Gain Directional Communications
The enhanced radiation performance of a dipole antenna backed by the split ring resonator-continuous wire pair array working in the H┴ excitation scenario is presented in this paper. The H┴ excitation scenario of the metamaterial is used to get zero reflection phase resulting in enhanced gain performance. The two layer meta-structure along with the dipole is fabricated on a low cost substrate of dielectric constant 4.4 and height 1mm. The reflection properties of the metamaterial structure and its effect on the radiation performance of the dipole antenna are presented in this paper
Assessment of Carbon Storage and Biomass on Minelands Reclaimed to Grassland Environments Using Landsat Spectral Indices
This study investigated carbon (C) storage and biomass in grasslands of West Virginia reclaimed surface minesites. Mine-related disturbance and subsequent reclamation may be an important component of C cycling. Biomass and C storage generally increased for the first five years after reclamation, but then declined, suggesting a nonlinear pattern to vegetation recovery. Three 2007 Landsat 5 Thematic Mapper and Landsat 7 Enhanced Thematic Mapper Plus images were used to assess the potential to predict biomass from raw red and near infrared radiance, the tasseled cap transformation (TC), and four vegetation indices [normalized difference vegetation index, enhanced vegetation index (EVI), triangular vegetation index, and the soil adjusted vegetation index]. TC greenness and EVI were most strongly correlated with biomass and illustrate a modest potential for monitoring vegetation recovery in reclaimed minelands. Additionally, a number of regression models that included age since reclamation and spectral indices were statistically significant suggesting a temporal recovery pattern amongst minesites in this study
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