Browsing by Author "Kumar, Sachin"
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Publication An energy and time-saving task scheduling algorithm for UAV-IoT collaborative system(Elsevier B.V., 2023) Banerjee, Anuradha; Sufian, Abu; Srivastava, Ashutosh; Gupta, Sachin Kumar; Kumari, Saru; Kumar, SachinUnmanned Aerial Vehicles (UAVs) are capable of providing significant potential to the Internet of Things (IoT) devices through sensors, cameras, GPS systems, etc. Therefore, the smart UAV-IoT collaborative system has become a current hot research topic. However, there are issues like resource allocation, security, and privacy preservation, trajectory optimization, intelligent decision, energy harvesting, etc. that need extensive research and analysis. In this article, we propose an energy-efficient and time-saving task scheduling algorithm that divides the IoT devices into certain clusters based on physical proximity. By utilizing the algorithm, cluster heads can apply an Auto Regressive Moving Average (ARMA) model to predict intelligently the timestamp of the arrival of the next task and associated estimated payments. Based on the overall expected payment, a cluster head can smartly advise the UAV about its time of next arrival. Simulation results demonstrate that our proposed Energy and Time-saving Task Scheduling (ETTS) algorithm show significant improvement in terms of energy (around 67%) as well as a delay (around 36%) over the Task scheduling for Indoor Environment (TSIE) and Time Division Multiple Access-Workflow Scheduler (TDMA-WS). The improvement in delay arises from the saved time of retransmissions. ARMA model basically tries to ensure that processing capacity of an UAV doesn't remain unutilized or under-utilized. The energy that UAV invests to arrive at one particular clusterhead, should be reciprocated by a full or close-to-full task queue of a clusterhead. � 2023Publication Combined Abiotic Stresses: Challenges and Potential for Crop Improvement(MDPI, 2022) Shabbir, Rubab; Singhal, Rajesh Kumar; Mishra, Udit Nandan; Chauhan, Jyoti; Javed, Talha; Hussain, Sadam; Kumar, Sachin; Anuragi, Hirdayesh; Lal, Dalpat; Chen, PinghuaAbiotic stressors are major constraints that affect agricultural plant physio-morphological and biochemical attributes, resulting in a loss of normal functioning and, eventually, a severe decline in crop productivity. The co-occurrence of different abiotic stresses, rather than a specific stress situation, can alter or trigger a wide range of plant responses, such as altered metabolism, stunted growth, and restricted development. Therefore, systematic and rigorous studies are pivotal for understanding the impact of concurrent abiotic stress conditions on crop productivity. In doing so, this review emphasizes the implications and potential mechanisms for controlling/managing combined abiotic stresses, which can then be utilized to identify genotypes with combined stress tolerance. Furthermore, this review focuses on recent biotechnological approaches in deciphering combined stress tolerance in plants. As a result, agronomists, breeders, molecular biologists, and field pathologists will benefit from this literature in assessing the impact of interactions between combined abiotic stresses on crop performance and development of tolerant/resistant cultivars. � 2022 by the authors.Publication FRACTIONAL FUZZY MODEL OF ADVECTION-REACTION-DIFFUSION EQUATION WITH APPLICATION IN POROUS MEDIA(Begell House Inc., 2022) Kumar, SachinIn this present article, a model of the fractional diffusion equation in a fuzzy environment is studied with both singular and nonsingular kernels with a Mittag-Leffler kernel. In this model, initial boundary conditions and coefficients are fuzzy numbers. First of all, we derive the Legendre operational matrix of fractional differentiation concerning the power kernel and Mittag-Leffler kernel. We used the spectral method in addition to these derived operational matrices to find out the numerical solution of the taken model. This method is easily applicable to fuzzy partial differential equation (PDE) with different fractional operators. It reduced the given model into algebraic equations, which with further solving gives the solution of the model. The feasibility and accuracy of the method on a fractional fuzzy PDE can be seen through the numerical examples in which we incorporated the error table calculated between exact and numerical solution. The dynamics of the model concerning different parameters present in the model are presented in thorough figures. The application of this model in porous media is presented. � 2022 by Begell House, Inc.Publication Lanthanide based double perovskites: Bifunctional catalysts for oxygen evolution/reduction reactions(Elsevier Ltd, 2021) Kumar, Sachin; Singh, Monika; Pal, Raj; Azad, Uday Pratap; Singh, Ashish Kumar; Singh, Divya Pratap; Ganesan, Vellaichamy; Singh, Akhilesh Kumar; Prakash, RajivIn this work, we are reporting the facile synthesis of double perovskite oxide materials LnBa0.5Sr0�5Co1�5Fe0�5O6 (LnBSCF, Ln = Pr, Nd, Sm, and Gd) using citrate-nitrate based sol-gel method. These double perovskite oxide materials exhibit bifunctional catalytic activity for the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). The phase formation and structure of the prepared oxides have been determined by powder X-ray diffraction, SEM analysis. Presence of various phases is analyzed and quantified by mean of Le-Bail refinement of XRD profiles. SEM analyses confirm the morphology and composition of prepared catalysts. Electrochemical measurements, e.g. Linear Sweep Voltammetry, Cyclic Voltammetry and Electrochemical Impedance spectroscopy were used to study catalytic performance of prepared catalyst towards both oxygen evolution and oxidation reduction reactions in alkaline solution. Better catalytic performance was obtained in case of double perovskites as compared to parent perovskite for both reactions. Best catalytic performance was observed for Gd based double perovskite. � 2021 Hydrogen Energy Publications LLCPublication Performance Enhancement of STATCOM Integrated Wind Farm for Harmonics Mitigation Using Optimization Techniques(Springer Science and Business Media Deutschland GmbH, 2021) Hamdy, Mohamed; Attia, Mahmoud A.; Abdelaziz, Almoataz Y.; Kumar, Sachin; Sarita, Kumari; Saket, R.K.Renewable energy generation is growing every day all over the world. This injects the grids with harmonics and increases the total harmonics distortion of the systems. In the other hand, Flexible AC transmission systems (FACTS) are used in the different power systems for the enhancement of the stability of these systems. In this paper, Flexible AC transmission systems (FACTS) shall be used not for the enhancement of the stability of the system as usual, but to mitigate the harmonics of the system and decrease the Total harmonics distortion (THD). The Static Synchronous Compensator (STATCOM) performance is compared using The Harmony Search Optimization Algorithm (HSA) and the Invasive Weed Optimization (IWO) trying to achieve better results. MATLAB/SIMULINK is used to create a power system model of wind generation system and then is used to compare the two techniques. � 2021, The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.Publication Pinpointing the Geographic Origin of 165-Year-Old Human Skeletal Remains Found in Punjab, India: Evidence From Mitochondrial DNA and Stable Isotope Analysis(Frontiers Media S.A., 2022) Sehrawat, J.S.; Agrawal, Shailesh; Sankhyan, Deeksha; Singh, Monika; Kumar, Sachin; Prakash, Satya; Rajpal, Richa; Chaubey, Gyaneshwer; Thangaraj, Kumarasamy; Rai, NirajIn 2014, 157�years after the Sepoy Mutiny of 1857, several unidentified human skeletons were discovered in an abandoned well at Ajnala, Punjab. The most prevailing hypothesis suggested them as Indian soldiers who mutinied during the Indian uprising of 1857. However, there is an intense debate on their geographic affinity. Therefore, to pinpoint their area of origin, we have successfully isolated DNA from cementum-rich material of 50 good-quality random teeth samples and analyzed mtDNA haplogroups. In addition to that, we analyzed 85 individuals for oxygen isotopes (?18O values). The mtDNA haplogroup distribution and clustering pattern rejected the local ancestry and indicated their genetic link with the populations living east of Punjab. In addition, the oxygen isotope analysis (?18O values) from archaeological skeletal remains corroborated the molecular data and suggested the closest possible geographical affinity of these skeletal remains toward the eastern part of India, largely covering the Gangetic plain region. The data generated from this study are expected to expand our understanding of the ancestry and population affinity of martyr soldiers. Copyright � 2022 Sehrawat, Agrawal, Sankhyan, Singh, Kumar, Prakash, Rajpal, Chaubey, Thangaraj and Rai.Publication Pyramiding of genes for grain protein content, grain quality, and rust resistance in eleven Indian bread wheat cultivars: a multi-institutional effort(Springer Science and Business Media B.V., 2022) Gupta, Pushpendra K.; Balyan, Harindra S.; Chhuneja, Parveen; Jaiswal, Jai P.; Tamhankar, Shubhada; Mishra, Vinod K.; Bains, Navtej S.; Chand, Ramesh; Joshi, Arun K.; Kaur, Satinder; Kaur, Harinderjeet; Mavi, Gurvinder S.; Oak, Manoj; Sharma, Achla; Srivastava, Puja; Sohu, Virinder S.; Prasad, Pramod; Agarwal, Priyanka; Akhtar, Moin; Badoni, Saurabh; Chaudhary, Reeku; Gahlaut, Vijay; Gangwar, Rishi Pal; Gautam, Tinku; Jaiswal, Vandana; Kumar, Ravi Shekhar; Kumar, Sachin; Shamshad, M.; Singh, Anupama; Taygi, Sandhya; Vasistha, Neeraj Kumar; Vishwakarma, Manish KumarImprovement of grain protein content (GPC), loaf volume, and resistance to rusts was achieved in 11 Indian wheat cultivars that are widely grown in four different agro-climatic zones of India. This involved use of marker-assisted backcross breeding (MABB) for introgression and pyramiding of the following genes: (i) the high GPC gene Gpc-B1; (ii) HMW glutenin subunits 5 + 10 at Glu-D1 loci, and (iii) rust resistance genes, Yr36, Yr15, Lr24, and Sr24. GPC increased by 0.8 to 3.3%, although high GPC was generally associated with yield penalty. Further selection among high GPC lines allowed identification of progenies with higher GPC associated with improvement in 1000-grain weight and grain yield in the backgrounds of the following four cultivars: NI5439, UP2338, UP2382, and HUW468. The high GPC progenies (derived from NI5439) were also improved for grain quality using HMW glutenin subunits 5 + 10 at Glu-D1 loci. Similarly, progenies combining high GPC and rust resistance were obtained in the backgrounds of following five cultivars: Lok1, HD2967, PBW550, PBW621, and DBW1. The improved pre-bred lines developed following multi-institutional effort should prove a valuable source for the development of cultivars with improved nutritional quality and rust resistance in the ongoing wheat breeding programmes. � 2022, The Author(s), under exclusive licence to Springer Nature B.V.Publication Reconstructing the population history of the Sinhalese, the major ethnic group in ?r? La?k?(Elsevier Inc., 2023) Singh, Prajjval Pratap; Kumar, Sachin; Pasupuleti, Nagarjuna; Weerasooriya, P.R.; van Driem, George; Tennekoon, Kamani H.; Rai, Niraj; Chaubey, Gyaneshwer; Ranasinghe, R.The Sinhalese are the major ethnic group in ?r? La?k?, inhabiting nearly the whole length and breadth of the island. They speak an Indo-European language of the Indo-Iranian branch, which is held to originate in northwestern India, going back to at least the fifth century BC. Previous genetic studies on low-resolution markers failed to infer the genomic history of the Sinhalese population. Therefore, we have performed a high-resolution fine-grained genetic study of the Sinhalese population and, in the broader context, we attempted to reconstruct the genetic history of ?r? La?k?. Our allele-frequency-based analysis showed a tight cluster of Sinhalese and Tamil populations, suggesting strong gene flow beyond the boundary of ethnicity and language. Interestingly, the haplotype-based analysis preserved a trace of the North Indian affiliation to the Sinhalese population. Overall, in the South Asian context, ?r? La?k?n ethnic groups are genetically more homogeneous than others. � 2023 The AuthorsPublication Screen Generic Lightlike Submanifolds of Golden Semi-Riemannian Manifolds(Birkhauser, 2022) Yadav, Akhilesh; Kumar, SachinIn the present paper, we introduce screen generic lightlike submanifold of golden semi-Riemannian manifolds and give non-trivial examples of such submanifolds. We obtain necessary and sufficient conditions for integrability of the distributions. Further, we find a necessary and sufficient condition for the induced connection to be a metric connection. We also obtain necessary and sufficient condition for totally umbilical screen generic lightlike submanifold of golden semi-Riemannian manifolds to be totally geodesic. Finally, we find some necessary and sufficient conditions for minimal screen generic lightlike submanifold of golden semi-Riemannian manifolds. � 2022, The Author(s), under exclusive licence to Springer Nature Switzerland AG.Publication SCREEN SEMI SLANT LIGHTLIKE SUBMANIFOLDS OF GOLDEN SEMI-RIEMANNIAN MANIFOLDS(Yarmouk University, 2022) Yadav, Akhilesh; Kumar, SachinIn this paper, we introduce the notion of screen semi slant lightlike submanifold of golden semi-Riemannian manifolds and providing characterization theorem with some non-trivial examples of such submanifolds. We find necessary and sufficient conditions for integrability and totally geodesic foliation of distributions RadTM, D1 and D2 Copyright � Deanship of Research and Graduate Studies, Yarmouk University, Irbid, Jordan.Publication SLANT LIGHTLIKE SUBMANIFOLDS OF GOLDEN SEMI-RIEMANNIAN MANIFOLDS(Drustvo Matematicara Srbije, 2023) Yadav, Akhilesh; Kumar, SachinIn this paper, we introduce the notion of slant lightlike submanifold of a golden semi-Riemannian manifold and provide a characterization theorem with some non-trivial examples of such submanifolds. We find necessary and sufficient conditions for integrability of distributions. Finally, we study curvature properties of slant lightlike submanifolds of golden semi-Riemannian manifolds. � 2023, Drustvo Matematicara Srbije. All rights reserved.
