The structural stabilities, elastic, electronic and magnetic properties of the Heusler-type shape memory alloy Ni(2)FeGa are calculated using density functional theory. The volume conserving tetragonal distortion of the austenite Ni(2)FeGa find an energy minimum at c/a = 1.33. Metastable behaviour of the high temperature cubic austenite phase is predicted due to elastic softening in the [110] direction. Calculations of the total and partial magnetic moments show a dominant contribution from Fe atoms of the alloy. The calculated density of states shows a depression in the minority spin channel of the cubic Ni(2)FeGa just above the Fermi level which gets partially filled up in the tetragonal phase. In contrast to Ni(2)MnGa, the transition metal spin-down states show partial hybridization in Ni(2)FeGa and there is a relatively high electron density of states near the Fermi level in both phases.

The fresh sap harvested from the unbloomed inflorescence of the adult spadix of coconut tree (Cocus nucifera L.) is known as “neera.” It must be collected below room temperature to prevent naturally occurring fermentation. The study aims to design and choose the Peltier cooling neera collection system (PCNCS) for integration with the neera tapping machine. With a 12 V 6 A Peltier module powered by a direct current, this collecting system operates via the Peltier effect. In each of the four designs, two Peltier modules were used. Since the heatsink and fan must be fixed in each design, they have unique dimensions and capabilities. A 305 W solar panel powers the system, charging a 12 V 100 Ah lead‐acid battery. The test was conducted for 210 min by dispensing a 219 mL sample of neera from a plastic drip bottle at a flow rate of 1.5 liters per day. The design boxes include a variety of models, including elongated cuboidal boxes, cuboidal boxes, cubic boxes, and triangular prism boxes. The corresponding designs reached temperatures of 16.5, 19, 22, 20, and 18°C. Two alternative Peltier fixing position models were applied in the cubic box design. Among the four potential designs, the elongated cuboidal box with a COP of 0.7323 has been chosen since its trial result shows the lowest temperature. Practical Applications The Solar‐powered Peltier‐based cooling neera collecting system can be used to collect the unfermented neera and store the harvested neera for a specific time. The cooling collection system can help the tapper collect the neera without climbing the coconut tree. It can also reduce the labor charge from the daily climbing of coconut trees to harvest neera. The designed system allows us to serve the neera in a short period because it is collected and discharged frequently. Also help to the farmers to increasing their economy by means reducing the operating cost.

Herein, we have inquired the structural, electronic and thermoelectric properties of the couple of chalcopyrite structured solids LiAlX2 (X=S and Se) with the help of density functional theory (DFT), which is tracked by resolution of the Boltzmann transport equation with the constant relaxation time calculations. The LDA (Localized Density Approximation), PBE (Perdew-Burke-Ernzerhof), PBEsol (PBE functional revised for solids) and WC (Wu-Cohen) exchange correlation potentials have been used. The calculated lattice constants a = 5.271 Å; c = 10.178 Å and a = 6.226 Å; c = 12.165 Å for LiAlS2 and LiAlSe2 respectively and the band gap of the mentioned compounds are found in range from 1.74 eV to 3.13 eV. The dependency of thermoelectric parameters are calculated with different temperature (300-800K) and carrier concentration 1018 1019 cm-3 . From the study of ZT (figure of merit’s ZT= S2 σT/κ the dimensionless parameter) and it is found that it’s value for both the compounds in n-type as well as in p-type region is ‘unity’. Since these compounds can be the promising candidate for thermoelectric devices also these compounds are non-toxic, eco-friendly and good alternative for the green and renewable source of electric power generators.

The ab-initio calculations have been executed for structural, electronic and optical properties of LiAlTe2, LiGaTe2 and LiInTe2 chalcopyrite structured solids and these calculations are grounded on the principle of density functional theory employed into the full potential augmented plane wave method. The computed lattice constants oscillating from a = 6.257 Å to 6.450 Å and c = 12.044 Å to 12.256 Å for LiXTe2 (X=Al, Ga and In) and also these values consistent with experimentally existed lattice constants. From the study of electronic band-gap, it confirms that these compounds are good semiconductors with direct band-gaps from 2.22 eV, 1.48 eV and 1.61 eV for LiXTe2 (X=Al, Ga and In). The result of optical properties confirms that these chalcopyrite semiconductors can be the fortunate compounds for the photovoltaic applications.