Rahul Omar

• National Institute of Technology Rourkela

Voltage instability is one of the main causes of electrical power system blackouts all around the world. Voltage instability can be analyzed with the used of PV and QV curves technique. From these curves, the values of voltage stability margin (VSM) can be determined. VSM is very important in analyzing voltage instability because it shows the dista...

Fuzzy logic controllers are widely used in induction motor drives systems for their robust performance. Several techniques have been promoted to lessen the computational burden and memory constraint for implementation of fuzzy logic controller in software and hardware. Rules reduction and optimization of fuzzy logic membership functions have been t...

Electro-mechanical oscillations are created, in the machines of an interrelated power network, followed by a trouble or due to high power transfer through weak tie lines. These oscillations should be damped as quickly as possible to guarantee the reliable and stable operation of the network. This research presents the analysis of change of speed, c...

This paper presents the application of neural networks for analysing voltage stability of load buses in electric power system. Voltage stability margin (VSM) and load power margin (LPM) are used as the indicators for analysing voltage stability. The neural networks used in this research are divided into two types. The first type is using the neural...

This research was proposed a new type of power system stabilizer based on fuzzy set theory, to improve the dynamic performance of a multi-machine power system. To have good damping characteristics over a wide range of operating conditions, speed deviation and it is derivative of a machine are chosen as the input signals to the fuzzy stabilizer on t...

High rate performance of symmetrical electrical-double layer capacitors (EDLCs) constructed with activated graphene oxide (ac-GO)/activated reduced graphene oxide (ac-RGO) electrodes and ionic liquid (triethylsulfonium bis(trifluoromethylsulfonyl)imide, incorporated plastic crystal succinonitrile (SN) based flexible gel polymer electrolytes (GPE) h...

In this study, we produced pre-carbonized date pits (PDP) and self-adhesive carbon grains (SACGs) from oil palm empty fruit bunches (EFB) by a low temperature (200°C for DP and 280°C for SACGs, respectively) carbonization method followed by KOH treatment to obtain KOH treated PDP (T-PDP) and KOH treated SACGs (T-SACGs). Four sets of green monolith...

In this study, we report the preparation of turbostratic-carbon/graphene from biomass amylose film by carbonization (N2 gas) and activation (CO2 gas) over different temperatures 600, 700, 800, 900, and 1000 °C, respectively. The Raman spectroscopy results of the produced samples show that the values of the I D /I G ratio ranging from 0.75 to 0.99 a...

Carbon based supercapacitor electrodes from composite of binderless activated carbon and graphene as a conductive additive were fabricated with various amount of graphene (0, 2, 4, 6, 8 and 10 wt%). Graphene was mixed in self-adhesive carbon grains produced from pre-carbonized powder derived from fibers of oil palm empty fruit bunches and converted...

Nowadays, multilevel inverters have become more attractive for their initial usage in high-voltage and high-power applications. This paper presents the analysis and the design of a three-phase cascaded H-Bridge Multilevel inverters (CHB-MLI) for three and five level based on Newton-Raphson technique for harmonic reduction in Dynamic Voltage Restore...

Power system stabilizers (PSS) are added to excitation system to enhance the damping during low frequency oscillations. This paper presents a study of fuzzy logic power system stabilizer for stability enhancement of a single machine connected to infinite bus (SMIB) power system. Recently fuzzy logic as a novel robust control design method has shown...

Recently, fuzzy logic controllers have been recognized in induction motor drives systems for their robust performance. Therefore, this paper presents a fuzzy logic (FL) control system based on FL approach for a vector controlled induction motor drives for high performance application. The analysis, design and simulation of the FL controller for vec...

Voltage instability analysis in electric power system is one of the most important factors in order to maintain the equilibrium of the power system. A power system is said to be unstable if the system is not able to maintain the voltage at all buses in the system remain unchanged after the system is being subjected to a disturbance.The research wor...

Voltage instability analysis in electric power system is one of the most important factors in order to maintain the equilibrium of the power system. A power system is said to be unstable if the system is not able to maintain the voltage at all buses in the system remain unchanged after the system is being subjected to a disturbance.The research wor...

We report a novel configuration of symmetrical electric double-layer capacitors (EDLCs) comprising a plastic crystalline succinonitrile (SN) based flexible polymer gel electrolyte, incorporated with sodium trifluoromethane sulfonate (NaTf) immobilised in a host polymer poly (vinylidine fluoride-co-hexafluoropropylene) (PVdF-HFP). The cost-effective...

Graphene/semicrystalline-carbon in the form of carbon flakes is produced by carbonization up to 600, 700, 800, 900 and 1000°C, respectively, of the amylose films prepared by a casting method on copper foil substrate. The carbon flakes are characterized by X-ray diffraction (XRD) method to determine their microcrystallite interlayer spacing, width a...

The dynamics in single machine been connected to an infinite power system bus is analyzed in this paper. This analysis requires certain amount of system modeling level. The main components of the system models are excitation system, synchronous machine and the Power System Stabilizer. The Simulink /Matlab are used as the programming tool for analyz...

This paper discusses a three-phase Cascaded H-bridge multilevel inverter (CHBMLI) based on Modulation Index (Ma)for harmonic reduction. The proposed method had been comprised of asuper capacitor SC with 5-level multilevel inverter, while the control system was based on the Newton Raphson (NR) method. Moreover, the main purpose of the research was t...

Objective: This paper discusses the configuration three-phase Cascaded H-Bridge Multilevel Inverter (CHBMLI) based on Newton Raphson (N.R.) method to produce obtain five-levels of output voltage by reduce Total Harmonic Distortion (THD). Method: The proposed method had been comprised of 5-level multilevel inverter, while the control system was base...

This paper presents an effective strategy for tuning of fuzzy membership functions based on fuzzy logic controller approach for a vector controlled induction motor drives for high performance applications. Initially, the input scaling factors are calculated based on known motor data and symmetrical triangular membership functions have been used for...

Automatic vehicle fueling system is a system which utilizes a positioning robot arm that is allowed to move using its search head and extendable nozzle toward the fueling spot of the car. Distance sensor and weight sensor are used in the system to locate the actual location of the car and provide accurate fueling position. This system includes 'FAS...

Cascaded H-Bridge multilevel inverter has become more attractive to generate high power in an electrical distribution system. This paper discusses the control of five level cascaded H-bridge multilevel inverter with super capacitor as a Dc energy storage. The control of the multilevel inverter using PI and space vector pulse width modulation (SVPWM...

Abstract This paper presents the effects of parameters variation over the speed response of vector controlled induction motor drives for high performance applications. The design and simulation of fuzzy logic controller are considered based on design case constant parameter fuzzy logic (DCCPFL) controller.The scaling factors for DCCPFL controller...

This paper presents the effects of parameters variation over the speed response of vector controlled induction motor drives for high performance applications. The design and simulation of fuzzy logic controller are considered based on design case constant parameter fuzzy logic (DCCPFL) controller. The scaling factors for DCCPFL controller are calcu...

A multilevel inverter is a preferred choice for most medium-voltage and high-power applications, as well as cascaded H-bridge (CHB) two-level inverters due to its advantages such as low cost, light weight and compact size. Space vector modulation is widely used in real-time digital control for power inverter and better DC utilization. It is suitabl...

The aim of this research project is to analyze and design of energy storages in electrical distribution system. In this paper presents a comparative study between sinusoidal pulse width modulation (SPWM) and space vector pulse width modulation (SVPWM) technique, based on generate signal five level of cascaded H-bridge for reduction harmonics in the...

Fibers of oil palm empty fruit bunches were used to produce self-adhesive carbon grains (SACG). The SACG green monoliths were carbonized in N2 environment at 800°C to produce carbon monoliths (CM) and the CM was CO2 activated at 800°C for 4 hour to produce activated carbon monolith electrodes (ACM). The physical properties of the CMs and ACMs were...

Activated carbon powders (ACP) were produced from the KOH treated pre-carbonized rubber wood sawdust. Different conductive materials (graphite, carbon black and carbon nanotubes (CNTs)) were added with a binder (polivinylidene fluoride (PVDF)) into ACP to improve the supercapacitive performance of the activated carbon (AC) electrodes. Symmetric sup...

Frontotemporal dementia is an important neurodegenerative disorder of younger life led by profound emotional and social dysfunction. Here we used fMRI to assess brain mechanisms of music emotion processing in a cohort of patients with frontotemporal dementia (n = 15) in relation to healthy age-matched individuals (n = 11). In a passive-listening pa...

Frontotemporal dementia is an important neurodegenerative disorder of younger life led by profound emotional and social dysfunction. Here we used fMRI to assess brain mechanisms of music emotion processing in a cohort of patients with frontotemporal dementia (n = 15) in relation to healthy age-matched individuals (n = 11). In a passive-listening pa...

The green monoliths (GMs) were prepared from the mixtures of pre-carbonized fibers of oil palm empty fruit bunches (or self-adhesive carbon grains (SACG)) and green petroleum coke (GPC) with the mixing ratio of 0, 10, 30, 50 and 70 % GPC, respectively. The GMs were carbonized in N2 environment at 800°C to produce carbon monoliths (CM00, CM10, CM30,...

Cascaded H-Bridge multilevel inverterhas become more attractive to generate high power in an electrical distribution system. This paper discusses the control of five level cascaded H-bridge multilevel inverter with super capacitor as a Dc energy storage. The control of the multilevel inverter using PI and space vector pulse width modulation (SVPWM)...

Activated porous carbon electrode prepared from fibres of oil palm empty fruit bunches was used for preparing the carbon based supercapacitor cells. The symmetrical supercapacitor cells were fabricated using carbon electrodes, stainless steel current collector, H2SO4electrolyte, and three types of nanoporous separators. Cells A, B and C were fabric...

This paper presents the investigation results based on the industrial 7% detuned LC passive filter. The significance of this study is to show that the effectiveness of the equipment to reduce harmonic currents produced by the non-linear loads such as a rectifier loads. In order to validate the performance of the 7% Detuned LC Passive Filter ,the ex...

Distribution Network Reconfiguration (DNR) is required to identify the best topology network in order to fulfill the power demand with minimum power losses. This paper proposes a new method which is called as Rank Evolutionary Particle Swarm Optimization (REPSO). The proposed method is a combination of the Particle Swarm Optimization (PSO) and the...

This paper discusses a concept of two types multilevel inverters including of Cascaded H-Bridge and Diode-Clamped for harmonic reduction on high power applications. Normally, multilevel inverters can be used to reduce the harmonic problems in electrical distribution systems. These studies focused on the performance and analysis of a three phase mul...

Table S1. Demographic and general neuropsychological data for participant groups Table S2. Experimental auditory stimuli and conditions Table S3. Significant contrasts and regions of activation for musicophilic versus nonmusicophilic patients

Olfactory dysfunction develops in many neurodegenerative diseases, and is an early feature of the most common neurodegenerative disorder, Alzheimer's disease (AD).1–5 Anatomically, the central olfactory pathways traverse brain regions implicated in the common neurodegenerative diseases, including the mesial temporal and inferior frontal lobes.6–10...

This paper proposes a hybrid model to identify the on-line pH characteristic of a neutralization plant. The hybrid model is the combination between neuro-fuzzy identification technique and first principle model. The neuro-fuzzy identification technique used training dataset to map the neutralization response curve in full ranges. The first principl...

Green monoliths (GMs) were prepared from mixtures of KOH (5% by weight), carbon nanotubes (5%) and self-adhesive carbon grains (90%) from oil palm empty fruit bunch fibers. The GMs were carbonized up to 600, 700 and 800°C under an N2 gas environment, and activated by CO2 gas at 800°C for one hour to produce activated carbon monoliths (ACMs), design...

This paper presents an instantaneous p-q Theory applied in shunt Active Power Filter (APF) to reduce the harmonics in power electrical system mainly in current waveform. The simulation by using Matlab/Simulink based on p-q Theory and the experimental results done in laboratory will be discussed. The results have shown a reduction of harmonics and a...

This paper presents the new topology of a three-phase four-wire Dynamic Voltage restorer (DVR) for mitigating voltage disturbances in low voltage distribution system. The proposed DVR topologies are consist of filtering scheme, isolation or distribution transformer, injection transformer winding and two split DC-link capacitors. The direct-quadratu...

This paper presents the analysis and design of a three phase four wire Dynamic Voltage Restorer (DVR) based on supercapacitor as energy storage for power quality improvement in electrical distribution system. The proposed system comprises of a supercapacitor as energy storage, DC-DC converter, and the power circuit of the DVR. It involves the const...

Background Deficits of flavour processing may be clinically important in frontotemporal lobar degeneration (FTLD). Objective To examine flavour processing in FTLD. Methods We studied flavour identification prospectively in 25 patients with FTLD (12 with behavioural variant frontotemporal dementia (bvFTD), eight with semantic variant primary progres...

Despite considerable recent interest, the biological basis and clinical diagnosis of behavioural variant frontotemporal dementia (bvFTD) pose unresolved problems. Mentalising (the cognitive capacity to interpret the behaviour of oneself and others in terms of mental states) is impaired as a prominent feature of bvFTD, consistent with involvement of...

there is currently limited information about the effects of dementia diseases on semantic memory for music: memory for musical objects and concepts. Here we review available evidence and emerging research directions in semantic memory for music in the degenerative dementias. Neurodegenerative pathologies affect distributed brain networks and can th...

Binderless composite electrodes in the monolithic form prepared from carbon nanotubes (CNTs) and self-adhesive carbon grains (SACG) from fibers of oil palm empty fruit bunch were studied as an electrode in a supercapacitor. The green monoliths (GMs) were prepared from three different types of precursors, SACG, SACG treated with 0.4 Molar H2SO4 and...

This paper presents a method to improve the performance of supercapacitors fabricated using binderless composite electrode monolith (BCMs) from self-adhesive carbon grains (SACG) of fibers from oil palm empty fruit bunches. The BCMs were prepared from green monoliths (GMs) contain SACG, SACG treated with KOH (5 % by weight) and SACG mixed with carb...

Dynamic Voltage Restorer (DVR) is a custom power device that is used to improve voltage disturbances in electrical distribution system. The components of the DVR consist of voltage source inverter (VSI), injection transformers, passive filters and energy storage. The main function of the DVR is used to inject three phase voltage in series and in sy...

The recent study by Weinstein and colleagues1 provides further evidence that semantic memory for music may be relatively spared in semantic dementia (SemD). This issue is both clinically and neurobiologically relevant. Music may be a potential island of meaning in the increasingly meaningless world inhabited by patients with SemD. More fundamentall...

The aim of this paper is to investigate the performance of a Fuzzy-Logic-Controller (FLC) which is applied on three-phase induction motor drive system for high-performance industrial applications. In this paper, the FLC is used as a speed controller to replace the conventional PI speed controller. The FLC will determine the time of switching on the...

Supplementary materials

The dynamic voltage restorer (DVR) is a custom device that is used to maintain the voltage at the load terminals from various power quality problems from a disturbed incoming supply. In this paper, a novel control strategy is described for mitigation of voltage sags and swells on sensitive loads. The new control of the compensation voltages in the...

This paper discusses the control technique improvement of a three-phase inverter using direct-quadrature-zero (d-q-0) controller based on DSP TMS320F2812 for dynamic voltage restorer (DVR) applications. The output of the inverter is then connected to a voltage grid via a second order filter and injection transformer. The control algorithms are deve...

The neurobiological basis of personality is poorly understood. Frontotemporal lobar degeneration (FTLD) frequently presents with complex behavioural changes, and therefore potentially provides a disease model in which to investigate brain substrates of personality. To assess neuroanatomical correlates of personality change in a cohort of individual...

Despite growing clinical and neurobiological interest in the brain mechanisms that process emotion in music, these mechanisms remain incompletely understood. Patients with frontotemporal lobar degeneration (FTLD) frequently exhibit clinical syndromes that illustrate the effects of breakdown in emotional and social functioning. Here we investigated...

Green pellets (GPs), prepared at different compression pressures (cs = 6, 7.5 and 12 metric tonne) from mixtures containing self-adhesive carbon grains (sacg) from the oil palm empty fruit bunch (EFB) and different percentages (pr = 0 to 90%) of a non self-adhesive powder of petroleum green coke (ppgc), were carbonized (800° C) and activated with C...

Impairments of face processing occur frequently in frontotemporal lobar degeneration (FTLD) but the neuroanatomical basis for these deficits has seldom been studied systematically. Here a prospective voxel based morphometry study is described addressing the neuroanatomy of two key dimensions of face processing--face identification and facial emotio...

The main problems of the voltage sag in low voltage distribution systems due to sensitive loads. Voltage sags can caused malfunction in the distribution system. In order to protect voltage sags in the network a device which called Dynamic Voltage Restorer (DVR) is installed between the incoming supply and the sensitive loads. It is found that the D...

This paper discusses a control technique improvement of a three-phase inverter using TMS320F2812 DSP controller for Dynamic Voltage Restorer (DVR) applications. The output of the inverter is then connected to a voltage grid via a second order filter and injection transformer. The Control algorithms are developed using TMS320F 2812 DSP. The proposed...

This paper discusses the mitigation of power quality disturbance in low voltage distribution system due to voltage swells using one of the powerful power custom devices namely Dynamic Voltage Restorer (DVR). The DVR normally installed between the source voltage and critical or sensitive load. The new configuration of DVR has been proposed using imp...

This research is regarding the application of a vision algorithm to monitor the operations of a system in order to control thedecision making concerning jobs and work pieces recognition that are to be made during system operation in real time. Thispaper stress on the vision algorithm used which mainly focus on the shape matching properties of the p...

Despite much recent interest in the clinical neuroscience of music processing, the cognitive organization of music as a domain of non-verbal knowledge has been little studied. Here we addressed this issue systematically in two expert musicians with clinical diagnoses of semantic dementia and Alzheimer's disease, in comparison with a control group o...

There is currently much interest in biomarkers of disease activity in frontotemporal lobar degeneration (FTLD). We assessed MRI and behavioral measures of progression in a longitudinal FTLD cohort. Thirty-two patients with FTLD (11 behavioral variant frontotemporal dementia [bvFTD], 11 semantic dementia [SemD], 10 progressive nonfluent aphasia [PNF...

This study explored the nature of the unprompted information that clinicians seek before making a treatment decision and whether this decision corresponded with the clinical parameters of the case. Interns, general practitioners (GP) and prosthodontists (n = 70, mean age 33 years, range 23-68) were presented with a written vignette of partial edent...

This paper presents the low voltage dynamic voltage restorer (DVR) based on application of space Vector Pulse Width Modulation (SVPWM) for three phases Voltage Source Converter (VSC) and it is the standard PWM techniques to utilize the DC-AC power conversion. A control technique based on SVPWM is also proposed for dynamic voltage restorer. The DVR...

Based on available investigations and current trends in oral rehabilitation published in the dental literature, an attempt is made to describe the possible future role of complete dentures. For edentulous patients, complete dentures have for long been the only prosthodontic treatment option. Whereas a large number of edentulous patients report sati...

A PARtially Simulated EXothermic chemical reactor (PARS-EX) pilot plant is developed in this work to carry out and evaluate various conventional and advanced control strategies. In this reactor, the heat generated from the assumed exothermic reaction was simulated through the use of a controlled steam flow rate into the reactor. Since there is no a...

The brain basis for music knowledge and the effects of disease on music cognition are poorly understood. Here we present evidence for relatively preserved knowledge of music in a musically untrained patient with semantic dementia and characteristic asymmetric anterior temporal lobe atrophy. Our findings suggest that music is partly separable neurop...

The cognitive mechanisms for the analysis of flavour information remain poorly understood. Patients with semantic dementia (SD) could potentially provide a window on these mechanisms; however, while abnormal eating behaviour and altered food preferences are common in SD, flavour processing has been little studied in this disorder. Here we undertook...

This paper deals with a new control technique for the modeling of a dynamic voltage restorer (DVR). The DVR is a power electronics device that is able to compensate voltage sags on critical loads dynamically. By injecting an appropriate voltage, the DVR restores a voltage waveform and ensures constant load voltage. The compensating signals are dete...

Salient sensory experiences often have a strong emotional tone, but the neuropsychological relations between perceptual characteristics of sensory objects and the affective information they convey remain poorly defined. Here we addressed the relationship between sound identity and emotional information using music. In two experiments, we investigat...

We assessed the significance and nature of delusions in frontotemporal lobar degeneration (FTLD), an important cause of young-onset dementia with prominent neuropsychiatric features that remain incompletely characterised. The case notes of all patients meeting diagnostic criteria for FTLD attending a tertiary level cognitive disorders clinic over a...

This paper describes the problem of voltage sags and swells and its severe impact on non linear loads or sensitive loads. The dynamic voltage restorer (DVR) has become popular as a cost effective solution for the protection of sensitive loads from voltage sags and swells. The control for DVR based on dqo algorithm is discussed. The proposed control...

This paper describes the effectiveness of using dynamic voltage restorer (DVR) in order to mitigate voltage sags and swells in low voltage distribution systems. A dynamic voltage restorer based on the dqo algorithm is discussed. The proposed control scheme is very effective to detect any disturbance in low voltage distribution systems. Simulation r...

The need for proper diagnosis and prediction of motor faults is vital for reliable and smooth operation of industrial sites. This however, is expensive, complex and hard to meet the standard required of reliable protection sytem. The diagnosis problems are more serious in speed variant motors because of change of placements and configurations of fa...

Motor current signature analysis is defined as a strategy to diagnose the motors significant events by locating a set of frequency components using pattern recognition. However, there is no index to give a clear idea about the fault extension and advise the deadline time and protection action on the situation. In this paper a new definition for pro...

There is great interest in using automatic computational neuroanatomy tools to study ageing and neurodegenerative disease. Voxel-based morphometry (VBM) is one of the most widely used of such techniques. VBM performs voxel-wise statistical analysis of smoothed spatially normalised segmented Magnetic Resonance Images. There are several reasons why t...

Semantic dementia is a sporadic neurodegenerative disorder characterized by the progressive erosion of semantic processing and is one of the canonical subtypes of frontotemporal lobar degeneration. This study aimed to characterize the pattern of global and regional longitudinal brain atrophy in semantic dementia and to identify imaging biomarkers t...

A 55-year-old woman was followed over a 13-year period as part of a longitudinal study of people at risk for familial dementia. She was a member of a family with an autosomal dominant familial dementia that fulfilled consensus criteria for frontotemporal lobar degeneration. The patient was initially asymptomatic but developed progressive behavioral...

The ethics review system of research is now well-established, at least in the developed world, although there are many differences in how countries view it and go about managing it. The UK specifically is now seeking to revise its system by speeding up the process of ethics approval but only for some studies. It is proposed that only those studies...

To describe the clinical, neuropsychologic, and radiologic features of a family with a C31LfsX35 mutation in the progranulin gene CCDS11483.1). Case series. A large British kindred (DRC255) with a PGRN mutation was assessed. Affected individuals presented with a mean age of 57.8 years (range, 54-67 years) and a mean disease duration of 6.1 years (r...

The processes that take place in industrial reactors are mainly highly nonlinear and, due to this, their controls have become a major factor in determining the aspect of process safety, quality, and productivity of these systems. For this reason, we have designed an inexpensive, practical reactor on a pilot plant scale to conduct such online contro...

The strategy of Motor current signature has widely been used in industry to diagnose motors faulty conditions. This strategy has some shortcomings that limit it as an engineering auxiliary tool. The main problem of this strategy is its low reliability that in fault diagnosis.In this paper feasibility of application of MCSA as an automatic protectio...

We describe two patients with isolated brainstem lesions who exhibited behavioural and cognitive changes that are commonly associated with frontal lobe pathology, as leading clinical features. These cases illustrate the role of distributed neural networks in cognitive and behavioural processes. The brainstem, frontal-subcortical and limbic systems...