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Spatio-temporal variation of trace elements distributed over surface water of Upper Ganga River Basin in Western Himalayan Region

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Journal of Mountain Science 2023年第1期20卷 145-162页

作者： Deepika DIMRI ambika kumar Deepakkumar MISHRA Archana SHARMA Doon University Dehradun248012India Bhagalpur National College Bhagalpur812007India

The rivers draining from the Himalayan range distribute enormous amount of fresh water to the people living in downstream *** metals flowed with river water can lead to serious impact on ecological system and human ***,the documentation on trace elements of Himalayan rivers is inadequately *** current study deals with the spatial and temporal variability of the major and trace elements of Ganga river water in epirhithron,metarhithron and hyporhithron zone belonging to Himalayan *** samples from nineteen monitoring locations were collected in pre-monsoon(May-June),monsoon(AugustSeptember)and post-monsoon(December)seasons and subjected to be assessed for 20 elements(Ag,Al,Ba,Cd,Ca,Cr,Cu,Fe,Ga,K,Mn,Mg,Na,Ni,Pb,Sr,Th,U,Zn,and Zr)using ICP-OES(Inductively Coupled Plasma-Optical Emission Spectrometer).Different water pollution indexes such as HPI(Heavy Metal Pollution Index),MI(Metal Index)and PI(Pollution Index)were used to describe current water quality status at each monitoring station under particular classified ecological *** studied stations in hyporhithron zone had the value of Metal Index(MI>1),indicating threshold of ***,the highest values of HPI in hyporhithron zone correspond to poor water quality *** with poor water quality were also found to be contaminated as per the Pollution Index(PI),exhibiting high concentrations for element(Fe).However,the epirhithron and metarhithron zone in Himalayan segment showed excellent water quality mainly contributed from natural *** Analysis(CA)and Principal Component Analysis(PCA)were applied to identify the main influential sources for Ganga river water *** Kriging interpolation method was also applied to prepare spatial distribution map of computed indexes(HPI,MI,and PI).With the help of index of local Moran’s I(LMI),identified spatial clusters and spatial outliers revealed the elevated concentration of most elements in hyporhithr

关键词： Trace elements Spatial variation Temporal variation Surface water Ganga River Basin ICP-OES

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Rising tide: The global surge of type 2 diabetes in children and adolescents demands action now

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World Journal of Diabetes 2024年第5期15卷 797-809页

作者： Joseph M Pappachan Cornelius James Fernandez ambika P Ashraf Department of Endocrinology and Metabolism Lancashire Teaching Hospitals NHS TrustPreston PR29HTUnited Kingdom Faculty of Science Manchester Metropolitan UniversityManchester M156BHUnited Kingdom Faculty of Biology Medicine&HealthThe University of ManchesterManchester M139PLUnited Kingdom Department of Endocrinology&Metabolism Pilgrim HospitalUnited Lincolnshire Hospitals NHS TrustBoston PE219QSUnited Kingdom Division of Pediatric Endocrinology and Diabetes Department of PediatricsUniversity of Alabama at BirminghamBirminghamAL 35233United States

Childhood-onset obesity has emerged as a major public healthcare challenge across the globe,fueled by an obesogenic environment and influenced by both genetic and epigenetic *** has led to an exponential rise in the incidence of type 2 diabetes mellitus in children and *** looming wave of diabetes-related complications in early adulthood is anticipated to strain the healthcare budgets in most *** there is a collective global effort to curb the devastation caused by the situation,the impact is poised to be pro-found.A multifaceted research effort,governmental legislation,and effective social action are crucial in attaining this *** article delves into the current epidemiological landscape,explores evidence concerning potential risks and consequences,delves into the pathobiology of childhood obesity,and discusses the latest evidence-based management strategies for diabesity.

关键词： Childhood obesity Diabesity Type 2 diabetes mellitus Adolescence Cardiovascular disease Pharmacotherapy

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Enhanced Clustering Based OSN Privacy Preservation to Ensure k-Anonymity, t-Closeness, l-Diversity, and Balanced Privacy Utility

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Computers, Materials & Continua 2023年第4期75卷 2171-2190页

作者： Rupali Gangarde Amit Sharma ambika Pawar Department of CSE Lovely Professional UniversityPhagwara144411India Department of CSE Symbiosis Institute of Technology(SIT)Affiliated to Symbiosis International(Deemed University)Pune412115India School of Computer Applications Lovely Professional UniversityPhagwara144411India Learning&Development Persistent UniversityPersistent SystemsPune411057India

Online Social Networks (OSN) sites allow end-users to share agreat deal of information, which may also contain sensitive information,that may be subject to commercial or non-commercial privacy attacks. Asa result, guaranteeing various levels of privacy is critical while publishingdata by OSNs. The clustering-based solutions proved an effective mechanismto achieve the privacy notions in OSNs. But fixed clustering limits theperformance and scalability. Data utility degrades with increased privacy,so balancing the privacy utility trade-off is an open research issue. Theresearch has proposed a novel privacy preservation model using the enhancedclustering mechanism to overcome this issue. The proposed model includesphases like pre-processing, enhanced clustering, and ensuring privacy *** enhanced clustering algorithm is the second phase where authorsmodified the existing fixed k-means clustering using the threshold *** threshold value is determined based on the supplied OSN data of edges,nodes, and user attributes. Clusters are k-anonymized with multiple graphproperties by a novel one-pass algorithm. After achieving the k-anonymityof clusters, optimization was performed to achieve all privacy models, suchas k-anonymity, t-closeness, and l-diversity. The proposed privacy frameworkachieves privacy of all three network components, i.e., link, node, and userattributes, with improved utility. The authors compare the proposed techniqueto underlying methods using OSN Yelp and Facebook datasets. The proposedapproach outperformed the underlying state of art methods for Degree ofAnonymization, computational efficiency, and information loss.

关键词： Enhanced clustering online social network k-anonymity t-closeness l-diversity privacy preservation

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Fingerprint Agreement Using Enhanced Kerberos Authentication Protocol on M-Health

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Computer Systems Science & Engineering 2022年第11期43卷 833-847页

作者： A.S.Anakath S.ambika S.Rajakumar R.Kannadasan K.S.Sendhil kumar School of Computing E.G.S.Pillay Engineering CollegeNagapattinam611002India Department of Computer Science and Engineering University College of Engineering AriyalurAriyalur621705India Department of Mathematics University College of Engineering AriyalurAriyalur621705India Department of Software Systems School of Computer Science and Engineering(SCOPE)Vellore Institute of Technology UniversityVellore632014India Department of IoT School of Computer Science and Engineering(SCOPE)Vellore Institute of Technology UniversityVellore632014India

Cloud computing becomes an important application development platform for processing user data with high *** providers are accustomed to providing storage centers outside the trusted location preferred by the data ***,ensuring the security and confidentiality of the data while processing in the centralized network is very *** secured key transmission between the sender and the receiver in the network is a huge challenge in managing most of the sensitive data transmission among the cloud *** are very active over the network like real authenticated user to hack the personal sensitive data,such as bank balance,health data,personal data,and confidential documents over the cloud *** this research,a secured key agreement between the sender and the receiver using Kerberos authentication protocol with fingerprint is proposed to ensure security in *** of patients are monitored using wireless sensor devices and are then transferred to the *** protocol helps in avoiding unnecessary communication of authenticated data over the cloud *** security process is a procedure with the best security in most of the authentication *** node is responsible in carrying data packets from the sender to the receiver in the cloud *** Kerberos protocol is used in trust node to ensure *** communication between the local health center and the healthcare server is ensured by using a fingerprint feature called minutiae form,which refers to the fingerprint image of both sender and *** computational and communicational cost of the proposed system is lesser when compared with other existing authentication methods.

关键词： Protocol security m-health cloud computing biometric fingerprint kerberos protocol

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Modification of structural and dielectric properties of polycrystalline Gd-doped BFO–PZO

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Journal of Advanced Dielectrics 2018年第5期8卷 1-21页

作者： ambika Ray Banarji Behera Tanmoy Basuy Saumitra Vajandar Santosh kumar Satpathy Pratibindhya Nayak Material Research Laboratory School of Physics Sambalpur UniversityJyoti Vihar BurlaOdisha 768019India Centre for Advanced 2D Materials National University of Singapore Singapore 117546Singapore Centre for Ion Beam Applications National University of Singapore Singapore 117542Singapore Department of Physics School of Applied Science Centurion University of Technology and Management BhubaneswarOdisha 752050India

(1-y)(BiFe_(1-x)GdxO_(3))–y(PbZrO3)composites(y=0:5),having four different Gd concentrations(x=0:05,0.1,0.15,and 0.2),were synthesized and their structural,dielectric,and ferroelectric properties have been studied using different characterization *** addition,to investigate the effect of ion implantation on the microstructure and dielectric properties,these composites were exposed to 2 MeV He+-*** of the structure,surface morphology and electrical properties of the samples before and after ion exposure were demonstrated using powder X-ray diffraction(XRD),scanning electron microscopy(SEM)technique,and LCR *** compositional analysis was carried out using energy dispersive X-ray spectrometry(EDS).XRD results demonstrated a decrease in the intensity profile of the dominant peak by a factor of 6 showing a degradation of the ***–Hall(WH)plots reveal reduction in the grain size after irradiation along with an increase in strain and dislocation density.A decrease in the dielectric constant and loss has been recorded after ion beam exposure with reduction in ac conductivity *** contribution of grain and grain boundary effect in conduction mechanism has been addressed using Nyquist *** the samples demonstrate a lossy ferroelectric loop which shows a clear modification upon *** role of structural defects modifying the physical properties of the composite materials is discussed in this work.

关键词： Ion beam irradiation defects dielectric properties ferroelectricity.

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Experimental Performance Analysis of a Corrugation Type Solar Air Heater(CTSAH)

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Energy Engineering 2022年第4期119卷 1483-1499页

作者： Aravindh Madhavankutty ambika Aarjab Ghimire Sreekumar Appukuttan Ministry of New and Renewable Energy Government of IndiaNew Delhi110003India Department of Green Energy Technology Madanjeet School of Green Energy TechnologiesPondicherry UniversityPuducherry605014India

This paper explains the experimental performance evaluation of a Corrugated Type Solar Air Heater(CTSAH)for understanding its performance in a humid tropical climatic condition in Puducherry,*** helps in understanding its effectiveness in using it for drying application of products like seafood,*** were conducted at different mass flow rates and their effect on the heat gain,efficiency,friction factor heat transfer,etc.,was *** were carried out at different mass flow rates,i.e.,M1=0.06 kg/s,M2=0.14 kg/s,M3=0.17 kg/s,M4=0.25 kg/s,M5=0.3 kg/s,and were conducted from 11:00 h to 14:00 *** air inlet&air temperature is found to be at an average of 40°C whereas the incident solar radiation is at an average of 795 W/*** results show that the optimum performance of the CTSAH is in the mass flow rate range of 0.14–0.25(kg/s).Also,the calculated useful heat produced,convective heat transfer coefficients,effective efficiency,optical efficiency provides knowledge on the potential use of the air heater.

关键词： Solar air heater performance analysis efficiency solar thermal

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Nonlinear time series analysis of the light curves from the black hole system GRS1915+105

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Research in Astronomy and Astrophysics 2011年第1期11卷 71-90页

作者： K.P.Harikrishnan Ranjeev Misra G.ambika Department of Physics The Cochin College Inter University Centre for Astronomy and Astrophysics Indian Institute of Science Education and Research

GRS 1915＋105 is a prominent black hole system exhibiting variability over a wide range of time scales and its observed light curves have been classified into 12 temporal states. Here we undertake a complete analysis of these light curves from all the states using various quantifiers from nonlinear time series analysis, such as the correlation dimension （D2）, the correlation entropy （K2）, singular value decomposition （SVD） and the multifractal spectrum （f（α） spectrum）. An important aspect of our analysis is that, for estimating these quantifiers, we use algorithmic schemes which we have recently proposed and successfully tested on synthetic as well as practical time series from various fields. Though the schemes are based on the conventional delay embedding technique, they are automated so that the above quantitative measures can be computed using conditions prescribed by the algorithm and without any intermediate subjective analysis. We show that nearly half of the 12 temporal states exhibit deviation from randomness and their complex temporal behavior could be approximated by a few （three or four） coupled ordinary nonlinear differential equations. These results could be important for a better understanding of the processes that generate the light curves and hence for modeling the temporal behavior of such complex systems. To our knowledge, this is the first complete analysis of an astrophysical object （let alone a black hole system） using various techniques from nonlinear dynamics.

关键词： accretion accretion disks -- X-rays: binaries

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Alteration of structural, optical and electrical properties of CdSe incorporated polyvinyl pyrrolidone nanocomposite for memory devices

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Journal of Advanced Dielectrics 2018年第3期8卷 64-78页

作者： Chetna Tyagi ambika Devi Department of Applied Sciences The NorthCap University Gurugram 122017 HaryanaIndia

The important enhancement in the structural,dielectric and optical properties of pure polymer and CdSe incorporated polyvinyl pyrrolidone has been reported in this *** surface morphology of CdSe/PVP nanocomposite film is studied by using scanning electron microscopy(SEM).The chemical composition of different elements has been reported using energy dispersive X-ray(EDX)*** structure of polymer nanocomposite is determined with the help of X-ray diffraction(XRD)spectrum and is observed to be *** size,intercrystalline separation,interplanner spacing,lattice parameters,strain and dislocation factors are calculated using XRD *** transform infrared spectroscopy(FTIR)and Photoluminescence(PL)analysis have been studied in order to check the possible interaction between CdSe quantum dots and polyvinyl pyrrolidone(PVP)*** ac conductivity of CdSe/PVP nanocomposite is found to be higher as compared to pure *** highest value of conductivity observed at 60203 Hz and at 523 K is found to be 3:72105 Sm*** study of dielectric constant,dielectric losses,dissipation factor,electric modulus and impedance has been *** semi-circles in impedance measurement for both materials show the bulk electrical properties that result in single relaxation process in CdSe/PVP nanocomposite.

关键词： Nanocomposites activation energy FTIR refractive index

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DOIND： a technique for leakage reduction in nanoscale domino logic circuits

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Journal of Semiconductors 2016年第5期37卷 69-77页

作者： ambika Prasad Shah Vaibhav Neema Shreeniwas Daulatabad Electronics & Telecommunication Engineering Department IET-Devi Ahilya University Indore-452017 India Electrical Engineering Department Indian Institute of Technology Bombay-400076 India

A novel DOIND logic approach is proposed for domino logic, which reduces the leakage current with a minimum delay penalty. Simulation is performed at 70 nm technology node with supply voltage 1V for domino logic and DOIND logic based AND, OR, XOR and Half Adder circuits using the tanner EDA tool. Simulation results show that the proposed DOIND approach decreases the average leakage current by 68.83%, 66.6%, 77.86% and 74.34% for 2 input AND, OR, XOR and Half Adder respectively. The proposed approach also has 47.76% improvement in PDAP for the buffer circuit as compared to domino logic.

关键词： deep submicron DOIND logic domino logic evaluation precharge subthreshold leakage

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Optimized Resource Allocation and Queue Management for Traffic Control in MANET

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Computer Systems Science & Engineering 2023年第5期45卷 1323-1342页

作者： I.ambika Surbhi Bhatia Shakila Basheer Pankaj Dadheech Department of Computer Science and Engineering PSN College of Engineering and TechnologyTirunelveli627152Tamil NaduIndia Department of Information College of Computer Science and Information TechnologyKing Faisal University36362Saudi Arabia Department of Information Systems College of Computer and Information SciencePrincess Nourah Bint Abdulrahman UniversityP.O.BOX 84428Riyadh11671Saudi Arabia Department of Computer Science&Engineering Swami Keshvanand Institute of TechnologyManagement&Gramothan(SKIT)Jaipur302017RajasthanIndia

A set of mobile devices that employs wireless transmission for communication is termed Mobile Ad hoc Networks(MANETs).Offering better communication services among the users in a centralized organization is the primary objective of the *** to the features of MANET,this can directly End-to-End Delay(EED)the Quality of Service(QoS).Hence,the implementation of resource management becomes an essential issue in *** paper focuses on the efficient Resource Allocation(RA)for many types of Traffic Flows(TF)in *** Mobile Ad hoc Networks environments,the main objective of Resource Allocation(RA)is to process consistently available resources among terminals required to address the service requirements of the *** three categories improve performance metrics by varying transmission rates and simulation *** solving that problem,the proposed work is divided into Queue Management(QM),Admission Control(AC)and *** effective QM,this paper develops a QM model for elastic(EL)and inelastic(IEL)Traffic *** research paper presents an AC mechanism for multiple TF for effective *** work presents a Resource Allocation Using Tokens(RAUT)for various priority TF for effective ***,nodes have three cycles which are:Non-Critical Section(NCS),Entry Section(ES)and Critical Section(CS).When a node requires any resources,it sends Resource Request Message(RRM)to the *** and inelastic TF priority is determined using Fuzzy Logic(FL).The token holder selects the node from the inelastic queue with high priority for allocating the *** Network Simulator-2(NS-2),simulations demonstrate that the proposed design increases Packet Delivery Ratio(PDR),decrease Packet Loss Ratio(PLR),minimise the Fairness and reduce the EED.

关键词： MANET resource allocation end-to-end delay fuzzy logic QoS

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