Indian Institute of Technology Palakkad&nbsp;(IIT Palakkad or IIT PKD) is a public autonomous&nbsp;engineering&nbsp;and&nbsp;research&nbsp;institute located in&nbsp;Palakkad,&nbsp;Kerala. It was&nbsp;one of the five new&nbsp;IITs&nbsp;proposed in the&nbsp;2014 Union budget of India. The campus was inaugurated on 3 August 2015. The institute has 94 faculty, 978 students, and 63 non-teaching staffs.

IT Palakkad currently offers four-year Bachelor of Technology (B.Tech) and two years MS programmes in 8 different engineering disciplines including&nbsp;Computer Science, Electrical, Mechanical, Civil among others.

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IIT Palakkad

The 4-amino-1,8-naphthalimide Tröger's base functionalized triazine covalent organic polymer TB-TZ-COP was synthesised and employed as a "turn-on" fluorescent and a colorimetric sensor for the discriminative sensing of volatile organic compounds; the TB-TZ-COP displaying the largest fluorescent enhancement and high sensitivity for 1,4-dioxane, a harmful environmental pollutant classified as a Group 2B carcinogen. © 2019 The Royal Society of Chemistry.

Department of Chemistry

World University root node

Chemical Communications

"Turn-on" fluorescence sensing of volatile organic compounds using a 4-amino-1,8-naphthalimide Tröger's base functionalised triazine organic polymer

This work reports the bifunctional catalytic activity of layered K-doped α-CrO(OH). The combined action of the redox active Cr(iii) and the surface hydroxyl groups was efficiently used to carry out 2-3 oxidation reactions in tandem followed by condensation/coupling reactions in one pot. Oxidation of benzyl alcohol followed by Knoevenagel condensation or coupling reactions forming C-C and C-N linkages in one pot is demonstrated. The catalyst has been characterized using XRD, IR, TGA, CO2-TPD, cyclic voltammetry, XPS and microscopic techniques to gain insight into the nature of active sites. The role of O- and O2- on the CrO(OH) catalyst in the bifunctional activity was studied using analytical techniques. Recyclability and leaching tests confirmed that K-α-CrO(OH) is a stable and environmentally safe catalyst. © 2019 The Royal Society of Chemistry.

Catalysis Science and Technology

Efficient bifunctional reactivity of K-doped CrO(OH) nanosheets: Exploiting the combined role of Cr(iii) and surface -OH groups in tandem catalysis

The control of a spacecraft equipped with a six-degree-of-freedom robot manipulator is studied in this paper. The objective is to rendezvous and synchronize with a satellite to facilitate inspection, servicing or de-orbiting. The space manipulator dynamics model with global parameterization on the configuration manifold is derived and used for designing asymptotically-stable control laws, so that they are valid globally in the configuration manifold. The control system consists of a sliding-mode rendezvous controller as well as a geometric attitude synchronization and a model-based servo control for the robot manipulator. The gains of the sliding-mode controller dictate a user-defined upper-bound on the thrust force. The attitude synchronization controller, concurrently with the rendezvous controller, is capable of micro-orbiting the space manipulator around spinning or tumbling satellites. It is observed through the simulations that the controller consumes limited amount of propellant, and it is feasible to use it for either a re-fueling (larger mass) or a de-orbiting (smaller mass) space manipulator. © 2019, American Astronautical Society.

Department of Electrical Engineering

Journal of the Astronautical Sciences

Rendezvous and Attitude Synchronization of a Space Manipulator

The design, development, and characterization of broadband (1–30 GHz) micro electromechanical systems (MEMS) based electrostatically driven lateral switching networks are presented in this paper. Initially, single switch performances are optimized, and later it is used to develop different switching networks like single-pole-double-throw (SPDT), single-pole-three-throw (SP3T), and single-pole-six-throw (SP6T). All switches are extensively characterized including reliability testing. Switching networks demonstrate measured return loss of better than 21 dB (11.4 dB) with worst case insertion loss of 0.67 dB (∼5 dB) and isolation of better than 31 dB (17.7 dB) at 3.5 GHz (28 GHz) for 5G communications. Switching networks tested for &gt; 1 billion cycles with 1 W of RF power are found to be operational. Maximum fabricated switch (SP6T) area is ∼0.7 mm2 including bias lines and pads. © 2019, Electromagnetics Academy. All rights reserved.

Progress In Electromagnetics Research M

Compact, broadband and reliable lateral MEMS switching networks for 5G communications

Microgrid mandates a highly accurate and reliable protection measure for safe and secure operation. Reliability of the protecting system becomes a serious concern when the microgrid operates with various types of DG units which includes synchronous, induction and inverter based DGs with different topology and modes of operation. This paper demonstrates an intelligent protection scheme using deep neural network (DNN) to perform the task of fault detection and classification. Fault currents retrieved at the relaying points are given to the proposed protection scheme to perform the desired task. The performance of the scheme is measured with wide variations in system parameters such as modes of operation and network topologies of the microgrid. The scheme is extensively tested on a large dataset even by varying types of inputs and different deep neural network structures. The test results and response time show that the proposed algorithm can be used in real time for protective measures of microgrid. © 2019 IEEE.

2019 8th International Conference on Power Systems: Transition towards Sustainable, Smart and Flexible Grids, ICPS 2019

A DNN based Intelligent Protective Relaying Scheme for Microgrids

Water vapor is of one of the most important constituents of Venus atmosphere because of its involvement in the formation of cloud, thermal balance and atmospheric chemistry. Water vapour abundance is approximately 30 ppm from ground up to an altitude of approximately 40 km, which is also the limit for Venus clouds. Infrared radiometer (PVOIR) measurements [1, 2, 3] from the 1978–1979 Pioneer Venus Orbiter show that cloud top water vapor has a strong diurnal variation. This variation could be ± 5 ppmv at night for 10 ppmv water vapour content, and daytime values could vary at ± 15 ppmv for values of 90 ppmv. In contrast, 15 Fourier Transform spectrometer (FTS) data from 1983 Venera [3, 4] show that cloud top water vapour abundances is of 7-17 ppmv, with no diurnal variability. Similarly, Earth-based infrared spectroscopy [5] measurements indicate that water vapour mixing ratios is in the range of 0.5 to 40 ppm in the altitude range 62–65 km. Despite the multiple measurements sources, accurate information about water vapour variations is still not available. This variation in the available information may be due to difference in the sounded altitude range, experimental and modeling errors. © 2019 URSI. All rights reserved.

2019 URSI Asia-Pacific Radio Science Conference, AP-RASC 2019

Design of millimeter-wave radiometer for measuring water vapour in venus atmosphere

A novel predictive current controller is proposed for a three-phase two-level active front end rectifier using virtual vector switching. Lyapunov stability criteria is applied to optimise the angle and magnitude of the virtual converter voltage vector to be applied at each sampling instant. The optimal virtual vector is then realised using suitable space vector modulation technique, thereby ensuring a constant switching frequency of operation of the converter. Since active front end converters are desired to operate at unity power factor, 60° continual bus clamping space vector modulation is employed to reduce the switching losses. The proposed controller thus ensures optimum operation of the converter at a fixed switching frequency, similar to conventional model predictive controllers along with the reduction in line current ripple, improved line current quality, minimal switching losses and less computational burden on the controller. The efficacy of the proposed controller is investigated for a two level active front end rectifier and the simulation results are presented. © 2019 IEEE.

IECON Proceedings (Industrial Electronics Conference)

A Novel Predictive Control for an Active Front End Rectifier using Lyapunov Stability Criteria

The demand for miniaturized products and functionalized parts is increasing, and many such products are made of hard and brittle materials machined by abrasive processes. The first part of this keynote paper is dedicated to a discussion of micro parts and micro structures machined – at least in part – by abrasive processes, followed by a discussion of the associated abrasive processes. The strengths and limitations of these processes, among which include dicing, micro grinding, micro abrasive blasting, and vibration and magnet field assisted finishing are discussed. The paper concludes with a discussion of future trends in the field. © 2019

Department of Mechanical Engineering

Fulltext

CIRP Annals

Abrasive processes for micro parts and structures

Unstable power swing (UPS) may cause unwanted zone-1 tripping. This is caused due to presence of electrical center within the reach of zone-1 of distance relay. Fast detection of unstable swing can assist distance relay in taking reliable decision. This paper suggests a new coordinate system with transient potential power as the y-coordinate and angular difference of positive sequence voltage phasors across the transmission line ({{\boldsymbol{\delta }}-{{\boldsymbol{\text{SR}}}}}) as the x-coordinate. We observed that this coordinate system can be useful to successfully differentiate an UPS from stable power swing (SPS) and three phase fault. The prediction is fast enough to prevent an unwanted zone-1 operation of distance relay. IEEE-39 bus New England test system is used to validate the proposed scheme. The suggested method showed improved and fast unstable swing detection accuracy under different pre-disturbance and fault conditions. © 2007-2012 IEEE.

IEEE Systems Journal

Transient Potential Power Based Supervisory Zone-1 Operation during Unstable Power Swing

Most of the recently occurred cascaded outages are resulted due to zone-3 mal-operations of distance relays. This paper introduces some new sensitivity factors to identify and monitor vulnerable relays functioning in the power transmission network. This information will help in enhancing the back-up protection operation of the power transmission system. To accomplish this task, indices such as line-outage-induced relay margin shift factor and generation-outage-induced relay margin shift factor are defined. An offline analysis of the power system is made to calculate the above two factors. This information helps in ranking the relays of the power system in terms of their vulnerability. Once the vulnerable relays are identified, their zone-3 operation is supervised by a new wide area information-based event detection logic. IEEE 9-bus and IEEE 39-bus test systems are used to validate the proposed scheme. The test results indicate that the proposed scheme can enhance the back-up protection operation of transmission network, which is very much essential to mitigate blackouts. © 2019 IEEE.