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International Journal of Sediment research 2023年第5期38卷 643-652页

作者： rekha Panghal Sudeshna Ghosh Department of Mathematics Amity School of Applied Sciences Amity University Haryana

The gravitational settling of a flexible, permeable circular and planktonic particle drenched in a fluid which is assumed to be Newtonian and incompressible along with being viscous was studied. A mathematical formulation and numerical simulations of the studied problem were done by applying the Immersed Boundary Method(IBM) in a two-dimensional fluid domain. Parametric studies were done for analyzing the impact of varying flexibilities and permeabilities with reference to settling velocity(terminal velocity) and shape deformation of the particle. The terminal velocity and permeability of the particle are directly proportional. It was observed that for fixed permeability, the terminal velocity increases when increasing the flexibility of the particle.

关键词： Immersed Boundary Method (IBM) Sedimentation Incompressible fluid Flexible particle Permeable particle Settling velocity

Excess Molar Volumes and Viscosities for Binary Mixtures of 1-Alkoxypropan-2-ols with 1-Butanol, and 2-Butanol at 298.15 K and Atmospheric Pressure

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Chinese Journal of Chemistry 2007年第12期25卷 1781-1789页

作者： PAL, Amalendu GABA, rekha Department of Chemistry Kurukshetra University Kurukshetra-136 119 India

Excess molar volumes Vm^E and kinematic viscosities v have been measured as a function of composition for binary mixtures of propylene glycol monomethyl ether （1-methoxy-2-propanol）, MeOCH2CH（OH）Me, propylene glycol monoethyl ether （1-ethoxy-2-propanol）, EtOCH2CH（OH）Me, propylene glycol monopropyl ether （1-propoxy-2-propanol）, PrOCH2CH（OH）Me, propylene glycol monobutyl ether （1-butoxy-2-propanol）, BuOCH2CH（OH）Me, and propylene glycol tert-butyl ether （1-tert-butoxy-2-propanol）, t-BuOCH2CH（OH）Me with 1-butanol, and 2-butanol, at 298.15 K and atmospheric pressure. The excess molar volumes are negative across the entire range of composition for all the systems with 1-butanol, and positive for the systems 2-butanol＋ 1-methoxy-2-propanol, and ＋1-propoxy-2-propanol, negative for the systems 2-butanol＋1-butoxy-2-propanol, and change sign for the systems 2-butanol＋ 1-ethoxy-2-propanol, and ＋ 1-tert-butoxy-2-propanol. From the experimental data, the deviation in dynamic viscosity η from ∑χiηi has been calculated. Both excess molar volumes and viscosity deviations have been correlated using a redlich-Kister type polynomial equation by the method of least-squares for the estimation of the binary coefficients and the standard errors.

关键词： excess molar volumes binary mixtures alkoxypropanols

Ensemble Deep Learning for IoT Based COVID 19 Health Care Pollution Monitor

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Intelligent Automation & Soft Computing 2023年第2期35卷 2383-2398页

作者： Nithya rekha Sivakumar Department of Computer Sciences College of Computer and Information SciencesPrincess Nourah Bint Abdulrahman UniversityRiyadh11671Saudi Arabia

Internet of things(IoT)has brought a greater transformation in health-care sector thereby improving patient care,minimizing treatment *** pre-sent method employs classical mechanisms for extracting features and a regression model for *** methods have failed to consider the pollu-tion aspects involved during COVID 19 *** Ensemble Deep Learning and Framingham Feature Extraction(FFE)techniques,a smart health-care system is introduced for COVID-19 pandemic disease *** Col-lected feature or data via predictive mechanisms to form pollution *** maps are used to implement real-time countermeasures,such as storing the extracted data or feature in a Cloud server to minimize concentrations of air *** integrated with patient management systems,this solution would minimize pollution emitted via patient’s sensors by offering spaces in the cloud server when pollution thresholds are ***,the Gini Index factor infor-mation gain technique eliminates unimportant and redundant attributes while selecting the most relevant,reducing computing overhead and optimizing system ***,the COVID-19 disease prognosis ensemble deep learning-based classiﬁer is *** analysis is planned to measure the prediction accuracy,error,precision and recall for different numbers of *** results show that prediction accuracy is improved by 8%,error rate was reduced by 47%and prediction time is minimized by 36%compared to exist-ing methods.

关键词： Internet of Things Covid-19 ensemble deep learning framingham feature extraction

Microwave gel combustion synthesis and sinterability of Nd:GGG nanopowders

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Journal of rare Earths 2014年第6期32卷 521-525页

作者： Kiranmala Laishram rekha Mann Neelam Malhan Laser Materials Division Laser Science and Technology Centre DRDO

Neodymium doped gadolinium gallium oxide （Nd：GGG） nanopowders synthesized by microwave gel combustion using alanine as a fuel was reported. Metal nitrates solution with alanine fuel was combusted in microwave to give precursor. The micro-wave precursor powder was calcined at different temperatures from 800 to 1100 ℃. Phase pure Nd：GGG formation took place at 800 to 1100 ℃ as observed by X-ray diffraction （XrD） and Fourier transform infra-red （FTIr） spectroscopy. However particle size in-creased with calcinations temperature from 25 nm at 800 ℃ to 200 nm at 1100 ℃.Nd：GGG nanopowder obtained at different calci-nation temperatures were compacted and sintered at 1550 ℃ for 3 h in air. Most densified ceramic was obtained from Nd：GGG nanopowder calcined at 1100 ℃. Microstructure as observed from scanning electron microscopy （SEM） showed that the most densi-fied ceramic, obtained from nanopowder calcined at a higher calcination temperature, had a more uniform grain-size distribution, fewer pores and greater densification. XrD of sintered sample showed retention of phase purity.

关键词： Nd:GGG microwave gel combustion calcinations densification rare earths

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Single step low temperature synthesis of gadolinium gallium garnet nanopowders

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Journal of rare Earths 2012年第6期30卷 545-547页

作者： rekha Mann Kiranmala Laishram Neelam Malhan Laser Materials Division Laser Science and Technology CentreDRDOMetcalfe House Delhi-110054India

Solution combustion synthesis of single-phase gadolinium gallium oxide （Gd3GasO12, GGG） nanopowders, by a fuel mixture approach using urea and glycine at a low temperature of 500 ℃, was being reported for the first time. Based on the fact that urea and glycine are good fuels for gallium oxide and gadolinium oxide synthesis, the fuel mixture composition was obtained, which could lead to direct phase pure cubic Gd3Ga5O12 formation without any subsequent calcination step. Combustion was carried out in furnace pre-heated at 500 ℃. Thermogravimetric analysis （TGA） of combustion product showed negligible mass loss indicating direct formation of GGG powder. Fourier transform infrared （FTIr） spectrum of combusted product showed peak characteristic of GGG in case of mixed fuel. X-ray diffraction （XrD） confirmed formation of phase pure GGG at 500 ℃ in preheated furnace. Very fine, well dispersed nanometric particles of size range of 50-100 nm were obtained, being uniform and close to spherical morphology as observed by transmission electron microscope （TEM）.

关键词： direct synthesis solution combustion GGG mixed fuel calcinations free rare earths

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Deep Neural Artificial Intelligence for IoT Based Tele Health Data Anal

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Computers, Materials & Continua 2022年第3期70卷 4467-4483页

作者： Nithya rekha Sivakumar Ahmed Zohair Ibrahim Department of Computer Sciences College of Computer and Information SciencesPrincess Nourah Bint Abdulrahman UniversityRiyadh11671Saudi Arabia

Tele health utilizes information and communication mechanisms to convey medical information for providing clinical and educational *** makes an effort to get the better of issues of health service delivery involving time factor,space and laborious terrains,validating cost-efficiency and finer ingress in both developed and developing *** health has been categorized into either real-time electronic communication,or store-andforward *** recent years,a third-class has been perceived as remote healthcare monitoring or tele health,presuming data obtained via Internet of Things(IOT).Although,tele health data analytics and machine learning have been researched in great depth,there is a dearth of studies that entirely concentrate on the progress of ML-based techniques for tele health data analytics in the IoT healthcare *** by this fact,in this work a method called,Weighted Bayesian and Polynomial Taylor Deep Network(WB-PTDN)is proposed to improve health prediction in a computationally efficient and accurate ***,the Independent Component Data Arrangement model is designed with the objective of normalizing the data obtained from the Physionet ***,with the normalized data as input,Weighted Bayesian Feature Extraction is applied to minimize the dimensionality involved and therefore extracting the relevant features for further health risk ***,to obtain reliable predictions concerning tele health data analytics,First Order Polynomial Taylor DNN-based Feature Homogenization is proposed that with the aid of First Order Polynomial Taylor function updates the new results based on the result analysis of old values and therefore provides increased transparency in decision *** comparison of proposed and existing methods indicates that the WB-PTDN method achieves higher accuracy,true positive rate and lesser response time for IoT based tele health data analytics than the traditional methods.

关键词： Telehealth internet of things independent component weighted bayesian first order polynomial taylor deep neural network

Catalytic activity of manganese oxide supported on alumina in the synthesis of quinoxalines

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Frontiers of Chemical Science and Engineering 2013年第4期7卷 415-421页

作者： rekha M. Kathyayini H Nagaraju N Catalysis research Laboratory St Joseph's College Post Graduate and Research Centre Bangalore 560027 India Centre for Emerging Technologies Global Campus Jain University Bangalore 562112 India

Two catalysts, alumina and manganese oxide supported on alumina, have been prepared by calcination and precipitation-impregnation methods, respectively. The catalysts are characterised by the following techniques： Brunner-Emmett-Teller-N2 adsorption-desorption for sur- face area, temperature programmed desorption of NH3 and n-butyl amine back titration methods for surface acidity, powder X-ray diffraction for textural properties, and Fourier transform infrared spectroscopy for the anionic radicals. The catalytic activity has been determined under heterogeneous conditions in the condensation reaction between o-phenylenediamine and benzil. The product purity is checked by thin-layer chromatography and melting point. The products are also analysed by LC-MS and 1H-NMr techniques. The yields of the products have been found to be good and catalysts exhibited excellent recyclability. The effect of changing the reaction para- meters such as temperature, reaction time, amount of the catalyst, nature of solvent and molar ratio of reactants on the yield of the product has been studied. The surface acidity of the catalysts plays an important role in activating the reaction.

关键词： alumina manganese oxide deposited onalumina quinoxaline synthesis

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Cross-Tier Interference Mitigation in 3D HetNets for LTE and Wi-Fi Access

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Intelligent Automation & Soft Computing 2023年第1期35卷 1211-1227页

作者： M.rekha M.Bhuvaneswari Department of Electronics and Communication Engineering Dhanalakshmi Srinivasan Engineering College(Autonomous)Perambalur621212Tamil NaduIndia Department of Electronics and Communication Engineering Anna University BIT campusTiruchirappalli620024Tamil NaduIndia

Due to the unprecedented rate of transformation in thefield of wireless communication industry,there is a need to prioritise the coverage,network power and throughput as *** Heterogeneous Networks(HetNets)the low power node inclusion like Femto and Pico cells creates a network of Multi-Tier(M-Tier)which is regarded as the most significant strategy for enhancing the coverage,throughput,4G Long Term Evolution(LTE)*** work mainly focuses on M-Tier 3D Heterogeneous Networks Energy Efficiency(EE)based Carrier Aggregation(CA)scheme for streaming real-time huge data like ***,M-Tier 3D HetNets scheme was made for investigating Signal to Noise Interference ratio(SNIr)on assessing the collective Pico-tier and Femto-tier ***,the scheme of channel allocation is scrutinised so as to esti-mate throughput from the multiple ***,with the use of CA technique,the problem of energy efficiency for M-Tier 3D Heterogeneous Network(HetNet)in relation to energy metrics and throughput was evaluated with the use of LTE and Wireless Fidelity(Wi-Fi)*** simulation is carried out in a MATLAB setting,and the outcomes reveal a huge impact on *** simulation is carried in terms of EE,transmission time,throughput,packet success rate,convergence probability,and coverage *** analysis from simu-lation shows that on improving the output of the device,interference among small cell base stations is reduced on increasing *** outcomes attained aid in the effective creation of M-Tier 3D HetNets for enhancing EE by employing Multi-Stream Carrier Aggregation(MSCA)in HetNets.

关键词： Heterogeneous networks multi-tier 3D HetNets energy efficiency carrier aggregation LTE Wi-Fi

Divine or Cursed:Understanding the Conflict Syndrome in royal Myths of Pre-modern Northeast India

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Fudan Journal of the Humanities and Social Sciences 2022年第4期15卷 513-530页

作者： rashmi rekha Bhuyan Department of History Dibrugarh UniversityDibrugarhAssam786004India

The transition from pre-state to state societies involves some ideological *** pre-modern states of India,especially from the post-Gupta period onwards,the ruling authorities tried to legitimize their position by claiming ancestry/lineage from Brahmanical *** ruling dynasties patronized Brahmanism,and in return,the Brahmanas created myths of divine genealogy,which elevated the status of the *** pre-modern states of northeast India were not an exception to *** rulers of northeast India established Brahmanas and claimed divine genealogy with the help of myths created by the *** they patronized Brahmanism,the ruling dynasties never entirely abandoned their tribal traditions from which they originated because most of their subjects remained outside the Brahmanical ***,the ruling authorities played the role of mediator between the two different traditions,which is reflected in the contradictory nature of the royal myths created through the agency of the *** on the early kingdoms of Pragjyotisa-Kamarupa,the Ahoms,and the Koches of the medieval period,the paper attempts to explore the conflict syndrome in their royal myths and the polity formations of these pre-modern *** helps us understand the particularity of political processes in peripheral regions like northeast India.

关键词： Northeast India State formation royal myth Brahmanism Legitimacy

An Enhanced Security System Using Blockchain Technology for Strong FMC relationship

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Intelligent Automation & Soft Computing 2023年第1期35卷 111-128页

作者： K.Meenakshi K.Sashi rekha Department of Computer Science and Engineering Saveetha School of EngineeringSaveetha Institute of Medical and Technical SciencesChennaiIndia

Blockchain technology is a shared database of logs of all consumer transactions which are registered on all machines on a *** transactions in the system are carried out by consensus processes and to preserve confidentiality all thefiles contained cannot be *** technology is the fundamental software behind digital currencies like Bitcoin,which is common in the *** computing is a method of using a network of external machines to store,monitor,and process information,rather than using the local computer or a local personal *** software is currently facing multiple problems including lack of data protection,data instability,and *** paper aims to give the highest security for multiple user environments in cloud for storing and accessing the data in *** users who are legitimate are only allowed for storing and accessing the data as like a secured block chain *** like the Blockchain which does not require a centralized system for transactions,the proposed system is also independent on centralized network *** decentralized system is developed in such a way to avoid *** system enables the fabricator to spend less or null resources to perform the validations for its direct operated *** ensures the product fabricator to avoid the circulation of its duplicate *** customer as an end-user is also ensured to have only the genuine products from the *** Fabricator(F),Merchant(M)and consumer(C)forms an interconnected triangular structure without allowing any counterfeiting agents in their secured cloud *** pro-posed approach provides the stability in the security system of the cloud using the chaining mechanism within different blocks at each *** takes roughly 4.7,6.2,and 7.5 ms,respectively,to register each node in the proposed system for 5,10,and 15 *** overall registration time for each scenario is 11.9,26.2,and 53.1 ms,despite the fact th

关键词： Blockchain bitcoin customer merchant data protection digital currencies transaction