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.

Methane Production Quantification and Energy Estimation for Bangalore Municipal Solid Waste

Abstract: Landfills are considered as cornerstone of solid waste management. Landfill gas (LFG) and leachate are principal outputs from landfills. Methane, occupying significant volume of landfill gas, has considerable potential as a source of energy replacing enormous amounts of fossil fuels currently in use. Gas extraction and utilization systems need to be designed and implemented in order to exploit this resource. Assessment of economic viability of these systems necessitates estimation of gas released and its energy potential. Gas quantification and energy estimation for municipal solid waste (MSW) of Bangalore city was carried out using five independent methodologies. A small scale experiment was conducted to monitor the gas generation and the results were compared and analysed. Results show that significant energy can be harnessed from the MSW if requisite LFG management systems are installed. The use of methane as an energy source maximizes the extraction of useful resources from landfills, minimizes the global warming and offsets significant amount of fossil fuels.

Simulation of overvoltage stresses on surge arrester insulation

Abstract: Summary Impulse voltage testing is generally carried out for assessing the insulation strength of power equipment using standard impulse voltage waveforms in high-voltage laboratory. However, in actual field, the power equipment experiences standard and non-standard lightning impulse voltages. The main objective of this work is to analyse the voltage stress on surge arresters under standard and non-standard lightning impulse waveforms. Surge arrester models are developed in matlab (The MathWorks, Inc., Natick, Massachusetts, United States), and residual voltage test results are compared with manufacturer data for validation. Impulse voltage test is performed on the Institute of Electrical and Electronics Engineers surge arrester model using standard and non-standard lightning impulse voltage waveforms. The obtained test results showed that non-standard impulses have the potential to develop higher voltage stress and hence pose a high risk to surge arresters. However, results of this study provide the basis for further laboratory-based investigation considering a wide variety of impulse voltage waveforms representing the real lightning overvoltages. The test results will contribute to identify the need for modifying existing test standards or introducing new standards for impulse testing of surge arrester. Copyright © 2015 John Wiley & Sons, Ltd.

CODES: A COllaborative DEtection Strategy for SSDF Attacks in Cognitive Radio Networks

Abstract: Cognitive Radio Network (CRN) nodes called the Cognitive Radio (CR) nodes, sense the presence of a Primary User (PU) activity. The sensing reports from all the CR nodes are sent to a Fusion Centre (FC) which aggregates these reports and takes decision about the presence of the PU, based on some decision rules. Such a collaborative sensing mechanism forms the foundation of any centralised CRN. However, this approach can be misused by malicious Secondary Users (SUs) by carrying out Spectrum Sensing Data Falsification (SSDF) attacks. SSDF attacks which invade the CRN during spectrum sensing phase can affect the global decision of spectrum occupancy and thus, degrade the overall performance of a CRN. In this paper, a threshold-based detection strategy, CODES, is proposed for detection of SSDF attacks. Simulation results show successful detection of malicious SUs across a range of SSDF attacks.

Reviving, Development and Protection of Springs to Increase Water Security in the Himalayan Region

Abstract: Springs are the main source of water for drinking, agriculture, livestock feeding and other household consumption in the north-eastern Himalayan states of India. The largest number of populations in this region are completely dependent on these springs for all water needs. But in recent year it was observed that the majority of life-giving perennial springs discharging pattern has become seasonal and concentrated to monsoon period only, due to the change in rainfall duration and intensity, land use/land cover and anthropogenic activity in recharge areas. So, water scarcity and demand increased during the non-monsoon period, which is an uncertain situation for the long-term sustainability of the human population in the region. To sustain in this water scarcity condition, adopt suitable springshed and water management practices. Such as reviving/restoration and development of perennial springs, protection of springshed and store water when it is in excess. Anthropogenic activity in the springshed area is also affected by the spring discharge pattern and cause drying such as mounting tourist spots and rapidly growing towns and other human activity. In recent years, it was noticed that the water quality degraded due to poor management of springshed. The human activity in springshed is the main cause of water degradation such as agricultural practices, new construction, toilets, sewage, and industrial waste, etc.

Stiffness and damping characteristics of conical multirecess hybrid journal bearing for different load arrangements

Abstract: This paper presents the theoretical analysis on the effect of two different load arrangements for a conical multirecess hybrid journal bearing. For this analysis constant flow valve restrictors are used under micropolar lubricant for different semi cone angles. The modified Reynolds equation using micropolar fluid flow on the conical surface has been solved with the use of FEM and Galerkin’s technique applying proper boundary conditions in the iterative scheme. The study suggests that the configuration LA I can be a better alternative as compared to LA II for different semi-cone angles and external load in terms of bearing characteristics.