Indian Institute of Technology Bhubaneswar

About: Indian Institute of Technology Bhubaneswar is a education organization based out in Bhubaneswar, India. It is known for research contribution in the topics: Large Hadron Collider & Higgs boson. The organization has 1185 authors who have published 3132 publications receiving 48832 citations.

Durability and shrinkage studies of cement stabilsed granular lateritic soils

Abstract: Cement stabilised materials are increasingly being used in pavement structural layers to solve the issue of scarcity of good quality stone aggregates and also to enhance the performance of the pave...

Timing of rainfall occurrence altered by urban sprawl

Abstract: The impact of urban changes from 1989 to 2015 on urban rainstorms is assessed for the rapidly expanding Indian city of Hyderabad. A typical event that occurred during 12–14 June 2015 is simulated, and the possible association between altered urban-sprawl and shifts in the rainfall timing and patterns are analyzed. The simulation results revealed that the consideration of urban footprint changes was necessary to correctly simulate the heavy rainfall in the high-resolution Weather Research and Forecasting (WRF) model. With the urban expansion and associated anthropogenic heating (AH), the rainfall was more distributed, and its occurrence delayed by ~1–2 h. The results suggest that urbanization can affect rainfall both in terms of the timing as well as the location with respect to the urbanized area. The urban downwind region received an increased rainfall, and this spatial shift was more pronounced with increasing urbanization - from being over the urban area to over rural-urban boundary downwind of the city. The analysis of hydrometeors indicated that rain and cloud quantity decreased with an increasing AH in the urban area. Study results highlight the possibility that the change in the rainfall timing is another climatological signature of urban modification of rainfall.

Performance assessment of aged binder rejuvenated with Polanga oil

Abstract: Presently, there is a necessity of increasing the reclaimed asphalt pavement (RAP) content in recycling of asphalt pavements to save material cost, preserve energy and protect the environment and efforts are being made to utilize 100% RAP in the mixes. RAP binder is usually stiff due to oxidation and loss of volatiles. So addition of high amount of RAP to the asphalt mix, may make it prone to fatigue failure. Due to this reason, rejuvenators are added to restore some of the physical and chemical properties for desired performance of the mixture. In this study, a locally available non-edible oil known as Polanga oil (biological name: Calophyllum inophyllum) has been explored as rejuvenator to study its effect on performance of the aged binders. Aged binder prepared in the laboratory using the Pressure Aging Vessel (PAV) and binder extracted from the RAP collected from a nearby source were used in this study for rejuvenation. Aged binder and RAP binder mixed with the rejuvenator at varying percentages. The rheological characterizations in terms of flow, rutting, fatigue and creep recovery of rejuvenated PAV aged & RAP binders were carried out using a dynamic shear rheometer (DSR) to determine the optimum dosage of the rejuvenator. It was observed that, 5 percent of Polanga oil is able to divulge the desirable rheological properties of the rejuvenated binder.

Facile Hydrothermal Synthesis of MnWO4 Nanorods for Non-Enzymatic Glucose Sensing and Supercapacitor Properties with Insights from Density Functional Theory Simulations

Abstract: Here we report a facile and novel hydrothermal method to grow MnWO4 nanorods and their electrochemical glucose sensing and supercapacitor properties have been investigated. MnWO4 nanorods exhibited good glucose sensing performance with sensitivity of 13.7 μAμM−1cm−2 in the 5–110 μM linear range and specific capacitance of 199 F/g at 2 mV/s and 256.41 F/g at 0.4 A/g. First principles simulations have also been carried out to qualitatively support our experimental observations by investigating the bonding and charge transfer mechanism of glucose on MnWO4 through demonstration of Partial Density of States and charge density distributions. Large Density of States near Fermi level and empty d states around 2 eV above Fermi level of Mn d orbital qualify MnWO4 as communicating media to transfer the charge from glucose by participating in the redox reactions. Insight into the electronic structure reveals that there is charge transfer from oxygen p orbital of glucose to d orbital of Mn. Also, the quantum capacitance of MnWO4 electrodes has been presented to justify its supercapacitor performance. The maximum quantum capacitance of 762 μF/cm2 is obtained which is mostly contributed by the d electrons of Mn. Our experimental data and theoretical insight strongly infer that MnWO4 has the potential to be tailored as efficient and high-performance glucose sensing and energy storage devices.

Enhancement in Primary Frequency Regulation of Wind Generator using Fuzzy-based Control

Abstract: This article focuses on fuzzy logic-based primary frequency regulation of doubly fed induction generator type variable-speed wind turbine generators. Wind turbine generators can be operated at a deloading power point with a reduced power level instead of maximum power point. Deloading operation makes the reserve power available, which can be utilized to stabilize the power system for frequency regulation during active power mismatch between generation and demand. The droop control is implemented as supplementary control to improve the short-term frequency dynamics. In this article, the deloading parameter and droop parameter of wind turbine generators are dynamically adjusted by using a fuzzy-based controller that mitigates system frequency transients. The combination of fuzzy-based dynamic deloading and variable droop operation gives better power system performance in terms of frequency excursion and increases the output power extracted from the deloaded wind turbine generator. Hence, proposed th...