North Eastern Regional Institute of Science and Technology

About: North Eastern Regional Institute of Science and Technology is a education organization based out in Itanagar, India. It is known for research contribution in the topics: Population & Raman spectroscopy. The organization has 813 authors who have published 1429 publications receiving 16122 citations.

Experimental Investigation on Multidimensional Carbon Nanofiller Reinforcement in HDPE: An Evaluation of Mechanical Performance

Abstract: The current work reports on the evaluation of mechanical properties of HDPE reinforced with multidimensional carbon based nanofillers: Nanodiamonds (ND)-0D, Multiwalled Carbon Nanotubes (CNT)-1D and Graphite nano Platelets (GNP)-2D. A twin screw injection molding machine was used to fabricate samples and designated according weight percentage of nanofiller in pure HDPE as 0.1 ND, 0.1 CNT,and 0.1 GNP respectively. The optimum mechanical properties was exhibited by 0.1 ND, with a noted increase of 33.6, 23, 42, 34% in hardness, Young‘s modulus, fracture stress and yield stress as compared with pure HDPE. Halpin Tsai equation was used to predict Young‘s modulus of composite and results confirmed a close agreement between predicted and experimental observations.

Comparison of Pan Evaporation-Based Reference Evapotranspiration Model with Penman Monteith FAO-56 Model

Abstract: The pan evaporation-based model: Christiansen and the combination-based model: Penman Monteith FAO-56 were used to estimate reference evapotranspiration at different locations of Assam, India. The locations include meteorological stations at Dibrugarh, Dhubri, Goalpara, Golaghat, Gauhati, Gohpur, Lumding, Margherita, Nagrakata, North Lakhimpur, Sibsagar, Silchar, Silicorie and Jorhat. The Penman Monteith FAO-56 model was selected as the standard of comparison for evaluating the pan evaporation-based model. The criteria of the comparison for the study are the, standard error, coefficient of correlation and root mean square error. The monthly meteorological data of all the above-mentioned stations were collected and were used to estimate the ET0 and to carry out the regression analyses. The lowest and highest values of evapotranspiration obtained from Christiansen model were 2.61 mm/day and 8.67 mm/day in the months of December and May at Margherita and Dhubri, respectively. Christiansen model overestimated ET0 at all the locations. The RMSE, standard error and the correlation coefficient varied between 2.62 to 4.07; 0.76 to 0.10; and 0.99 to 0.71, respectively.

Application of Savonius Rotor for Hydrokinetic Power Generation

Abstract: Technological advancement is specifically identified by the usage of energy. The energy requirement is increasing because of the exponential population rise, increased industrial activities, and subsequent accelerated economic activities in both urban and suburban areas. The traditional power sources are becoming unsustainable as energy demand and induction of new sources for augmenting the energy need are lopsided. Additionally, traditional energy sources cause pollution, natural hazards, and more importantly, it is uneconomical. Due to these reasons, it becomes compelling to look for alternative sources of energy. Hydropower generation is reliable, non-polluting to a large extent, and a cheaper source of electrical energy. However, the conventional large hydropower projects, especially with reservoir components, are being opposed worldwide for social, environmental, economic, and safety reasons. Therefore, electricity production from free-flowing water may present a viable choice. Here, the free-flowing river water current is used to drive vertical-axis turbines preferably, Savonius rotors which are ideally built for wind energy conversion systems (WECS). The rotor is directly coupled to electric generators, and the scheme presents a typical variable voltage and variable frequency system similar to that of WECS except that the working force is due to water rather than wind. The use of the Savonius rotor for hydrokinetic power generation is uncommon; however, increased exploitation of this methodology may help in augmenting future energy need. This paper reviews the Savonius rotor and its possible application for hydrokinetic power generation; the merits and demerits of such schemes are clearly outlined.

Analytical modeling of a high- K underlap dielectric- and charge-modulated silicon-on-nothing FET-based biosensor

Abstract: Field-effect transistor (FET)-based biosensors with stacked gate oxides provide low leakage current and high sensitivity. However, an undesirable interfacial layer of silicate and silicon dioxide is formed in between the stacked oxides. In this paper, an underlap silicon-on-nothing FET-based biosensor with high-K gate oxide is presented for the detection of charged biomolecules, thereby removing the unwanted interfacial layer while preserving the sensitivity of the device. The study is based on a surface potential model for the proposed device, which is developed from Poisson’s equation by incorporating the dielectric and charge properties of the biomolecules. A threshold voltage model is then developed to examine the sensitivity of the device. The change in the device characteristics upon the accumulation of biomolecules is investigated to understand the impact of the biomolecules on the behavior and sensitivity of the device. The results show that the proposed device is highly sensitive to charged biomolecules, and that the charge of the biomolecules is more important than their dielectric properties for modulating the device characteristics. The results indicate that the proposed device has potential to be chosen as a new type of highly sensitive, nanosize, label-free biosensor with no unwanted interfacial layer. The analytical model is validated against two-dimensional (2-D) numerical simulation data obtained from ATLAS (SILVACO).