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The Impact of Heat Treatment and Surface Treatment on Thermal Conductivity of Heat Sinks Made of Aluminium Die Casting Alloys

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Journal of Harbin Institute of Technology(New series) 2024年

作者： Rajesh Kumar Manickam Dilip Raja narayana Department of Mechanical Engineering Vel Tech Rangarajan Dr.Sagunthala R&D Institute of Science and Technology

This research contributes significantly to understand the thermal management capabilities of plate fin heat sinks （PFHS） fabricated from AlSi10Mg. The uniqueness in this study is that the heat sinks were exposed to abrasive blasting， heat treatment， and graphene coating， and a full evaluation of the influence of the aforementioned treatments on the thermal management capacities of PFHS was found. Untreated PFHS is compared with 1) abrasive blasted and graphene coated heat sink， and 2) heat treated and graphene coated heat sink. To assess the thermal efficiency of the PFHS variants， a dedicated experimental set up was meticulously constructed. It is noteworthy that a junction temperature of 60oC was assumed as the reference point for the analysis. The results revealed that the charging cycle time which denotes the time required attaining the junction temperature， increased 1.3 times for the sample being abrasive-blasted at 5 MPa pressure and graphene-coated for 0.5mm when the maximum heat input of 45W is evaluated. When low heat input of 15 W is evaluated the results revealed that there is no significant difference in charging cycle when compared to the untreated heat sink. The charging cycle time increased 2 times for the sample which is heat–treated at 450oC and graphene – coated for 0.5mm at heat input of 15W. This finding unequivocally underscores the heightened capacity of the heat treated and graphene coated PFHS made of AlSi10Mg to withstand elevated junction temperatures.

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Vitamin D and hypertension:Is there any significant relation?

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Chronic Diseases and Translational Medicine 2024年第2期10卷 156-158页

作者： Naga P.Vakkalagadda Sri H.narayana Gummadi S.Sree Lakshmi D.Bethineedi L.V.Simhachalam Kutikuppala Gnana D.Medarametla Department of General Medicine Guntur Medical CollegeGunturAndra PradeshIndia Department of General Medicine Narayana Medical College and HospitalNelloreAndhra PradeshIndia Department of General Medicine Andhra Medical CollegeVisakhapatnamAndhra PradeshIndia Department of General Surgery Dr NTR University of Health SciencesVijayawadaAndhra PradeshIndia Department of General Medicine Amma Multi-Speciality HospitalThorrurTelanganaIndia

Dear Editor,Around a billion individuals worldwide have *** these,95%have essential hypertension,a type of undiagnosed hypertension.1 The regulation of blood pressure(BP)involves numerous signaling *** them,the Renin Angiotensin System is well *** these pathways are regulated by modulation of renal salt handling and tone of vascular smooth muscle(VSM)*** of these mechanisms can become faulty and alter the resistance arteries’VSM tone,which can elevate ***,since the exact origin of PH and its pathophysiology are unknown,less effective,and generic treatments are used.2 The fact that more than 50%of hypertension patients in the USA do not have their BP under good control serves as an illustration of *** treatment resistance affects an additional 5 million people and is defined as the inability to regulate BP despite the use of at least three antihypertensive drugs in combination.

关键词： hypertension drugs treatment

Cloud-Based Software Development Lifecycle:A Simplified Algorithm for Cloud Service Provider Evaluation with Metric Analysis

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Big Data Mining and Analytics 2023年第2期6卷 127-138页

作者： Santhosh S narayana Swamy ramaiah Computer Science&Engineering Jain(Deemed-to-be University)Bangalore 562112India

At present,hundreds of cloud vendors in the global market provide various services based on a customer’s *** cloud vendors are not the same in terms of the number of services,infrastructure availability,security strategies,cost per customer,and reputation in the ***,software developers and organizations face a dilemma when choosing a suitable cloud vendor for their developmental ***,there is a need to evaluate various cloud service providers(CSPs)and platforms before choosing a suitable *** existing solutions are either based on simulation tools as per the requirements or evaluated concerning the quality of service ***,they require more time to collect data,simulate and evaluate the *** proposed work compares various CSPs in terms of major metrics,such as establishment,services,infrastructure,tools,pricing models,market share,etc.,based on the comparison,parameter ranking,and weightage ***,the parameters are categorized depending on the priority *** weighted average is calculated for each CSP,after which the values are sorted in descending *** experimental results show the unbiased selection of CSPs based on the chosen *** proposed parameter-ranking priority level weightage(PRPLW)algorithm simplifies the selection of the best-suited cloud vendor in accordance with the requirements of software development.

关键词： cloud-based software development life cycle(SDLC) cloud evaluation parameter-ranking priority level weightage(PRPLW)algorithm cloud service providers software engineering

Survey on recent advances in IoT application layer protocols and machine learning scope for research directions

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Digital Communications and Networks 2022年第5期8卷 727-744页

作者： Praveen Kumar Donta Satish narayana Srirama Tarachand Amgoth Chandra Sekhara Rao Annavarapu Department of Computer Science and Engineering Indian Institute of Technology(Indian School of Mines)Dhanbad826004India School of Computer and Information Sciences University of HyderabadHyderabad500046India Mobile&Cloud Lab Institute of Computer ScienceFaculty of Science and TechnologyUniversity of Tartu50090Estonia

The Internet of Things(IoT)has been growing over the past few years due to its flexibility and ease of use in real-time *** IoT's foremost task is ensuring that there is proper communication among different types of applications and devices,and that the application layer protocols fulfill this ***,as the number of applications grows,it is necessary to modify or enhance the application layer protocols according to specific IoT applications,allowing specific issues to be addressed,such as dynamic adaption to network conditions and ***,several IoT application layer protocols have been enhanced and modified according to application ***,no existing survey articles focus on these *** this article,we survey traditional and recent advances in IoT application layer protocols,as well as relevant real-time applications and their adapted application layer protocols for improving *** changing the nature of protocols for each application is unrealistic,machine learning offers means of making protocols intelligent and is able to adapt *** this context,we focus on providing open challenges to drive IoT application layer protocols in such a direction.

关键词： Internet of things Machine learning Application layer Request-response protocols Publish-subscribe protocols

Flow fields around tandem and staggered piers on a mobile bed

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International Journal of Sediment Research 2022年第6期37卷 737-753页

作者： Laxmi narayana Pasupuleti Prafulkumar Vasharambhai Timbadiya Prem Lal Patel Department of Civil Engineering Sardar Vallabhbhai National Institute of Technology

An experimental investigation on flow fields within the scour holes upstream and downstream of circular piers positioned in tandem and staggered arrangements is reported and compared with isolated piers on mobile beds with uniform sediment. The instantaneous bed elevations and instantaneous three dimensional(3 D) velocities were measured using a 5 MHz Ultrasonic Ranging system and 16 MHz micro down looking acoustic Doppler velocimeter, respectively. The velocity and flow depth were measured at different locations under near equilibrium bed scour conditions. The measured 3 D velocities were processed for the computation of flow parameters, such as velocity fields, streamline patterns, vorticity fields, and circulation. Furthermore, turbulence intensities, turbulent kinetic energy, Reynolds shear stresses, and bed shear stresses around the piers for all three pier configurations were computed from the detrended velocity signals to identify significant differences in the flow parameters and turbulence in the tandem and staggered pier arrangements as compared to those for an isolated pier. A recirculation zone was found near the bed in front of the rear pier in the tandem case from the streamline *** vortices in the bi-vortex system were observed to be opposite to each other in the gap between the three piers in the staggered case. A strong secondary vortex also was observed apart from the primary vortex at the foot of the pier(θ = 0°) in all the three configurations. The strength of the horseshoe vortex(combination of primary and secondary vortices) was found to be higher at the front piers of the staggered arrangement as compared to those of the tandem piers, followed by the isolated pier. The bed shear stresses were found to be higher for the staggered piers than for the tandem piers in the direction of flow(θ = 0°). However, a 50% reduction in the bed shear stresses was observed behind the tandem piers at θ = 180°. The study reported in this paper provides

关键词： Staggered piers Tandem piers Scour hole Vorticity Circulation Bed level variation

Priority-based Residential Demand Response for Alleviating Crowding in Distribution Systems

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Journal of Modern Power Systems and Clean Energy 2023年第2期11卷 502-510页

作者： Venkateswarlu Gundu Sishaj P.Simon Vemalaiah Kasi narayana Prasad Padhy Dheeraj Kumar Khatod Department of Computer Science and Engineering Koneru Lakshmaiah Education Foundation GunturGunturIndia Department of Electrical and Electronics Engineering National Institute of Technology TiruchirappalliTiruchirappalliIndia Department of Electrical Engineering(EED) Indian Institute of Technology Roorkee(IITR)RoorkeeIndia

The dynamic pricing environment offers flexibility to the consumers to reschedule their switching *** the dynamic pricing environment results in several benefits to the utilities and consumers,it also poses some *** crowding among residential customers is one of such *** scheduling of loads at low-cost intervals causes crowding among residential customers,which leads to a fall in voltage of the distribution system below its prescribed *** order to prevent crowding phenomena,this paper proposes a priority-based demand response program for local energy *** the program,past contributions made by residential houses and demand are considered as essential parameters while calculating the priority *** non-linear programming(NLP)model proposed in this study seeks to reschedule loads at low-cost intervals to alleviate crowding *** the NLP model does not guarantee global optima due to its non-convex nature,a second-order cone programming model is proposed,which captures power flow characteristics and guarantees global *** proposed formulation is solved using General Algebraic Modeling System(GAMS)software and is tested on a 12.66 kV IEEE 33-bus distribution system,which demonstrates its applicability and efficacy.

关键词： Crowding strategy demand response distribution system General Algebraic Modeling System(GAMS) local energy community second-order cone programming

Subtalar dislocations:Mechanisms,clinical presentation and methods of reduction

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World Journal of Orthopedics 2023年第6期14卷 379-386页

作者： Manikandar Srinivas Cheruvu Sanjay narayana Murthy Raheel Shakoor Siddiqui Department of Trauma and Orthopaedics Royal Stoke University Hospital NHS TrustStoke-On-Trent ST46QGUnited Kingdom Department of Orthopaedics Birmingham Heartlands HospitalBirmingham Birmingham Heartlands HospitalUnited Kingdom

Subtalar joint is a complex joint in hindfoot formed by the talus superiorly and the calcaneus and navicular *** dislocations are high-mechanism injuries,which are caused by simultaneous dislocation of both talonavicular and talocalcaneal joints,without major fracture of the *** are usually classified as medial(most common),lateral,anterior and posterior dislocations,based on the position of foot in relation to talus and the indirect forces that have been applied to cause this significant *** are usually diagnosed by X rays,but computed tomography and magnetic resonance imaging can be used to identify associated intra-articular fractures and peri-talar soft tissue injuries *** being closed injuries,can be managed in ED by closed reduction and cast immobilisation,but if they are open,have poor *** that ensue open dislocations are post-traumatic arthritis,instability and avascular necrosis.

关键词： Joint Subtalar Joint dislocations Flatfoot Clubfoot Talus

Enhanced Energy Efficient with a Trust Aware in MANET for Real-Time Applications

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Computers, Materials & Continua 2023年第4期75卷 587-607页

作者： M.V.narayana Vadla Pradeep Kumar Ashok Kumar Nanda Hanumantha Rao Jalla Subba Reddy Chavva Department of CSE Guru Nanak Institutions Technical CampusHyderabadRanga Reddy DistrictTelangana501506India Department of CSE B V Raju Institute of TechnologyNarsapurMedakTelangana502313India Department of CSE T.R.R.Government Degree College KandukurKandukurA.P.523105India Department of IT VFST&Research(Deemed to be University)VadlamudiA.P.522213India

Mobile ad hoc networks (MANETs) are subjected to attack detectionfor transmitting and creating new messages or existing message *** attacker on another node evaluates the forging activity in themessage directly or indirectly. Every node sends short packets in a MANETenvironment with its identifier, location on the map, and time through *** attackers on the network broadcast the warning message usingfaked coordinates, providing the appearance of a network collision. Similarly,MANET degrades the channel utilization performance. Performancehighly affects network performance through security algorithms. This paperdeveloped a trust management technique called Enhanced Beacon TrustManagement with Hybrid Optimization (EBTM-Hyopt) for efficient clusterhead selection and malicious node detection. It tries to build trust amongconnected nodes and may improve security by requiring every participatingnode to develop and distribute genuine, accurate, and trustworthy materialacross the network. Specifically, optimized cluster head election is done periodicallyto reduce and balance the energy consumption to improve the lifetimenetwork. The cluster head election optimization is based on hybridizingParticle Swarm Optimization (PSO) and Gravitational Search OptimizationAlgorithm (GSOA) concepts to enable and ensure reliable routing. Simulationresults show that the proposed EBTM-HYOPT outperforms the state-of-thearttrust model in terms of 297.99 kbps of throughput, 46.34% of PDR, 13%of energy consumption, 165.6 kbps of packet loss, 67.49% of end-to-end delay,and 16.34% of packet length.

关键词： MANET malicious nodes clustering trust management beacon message

Combining ability and gene action studies for yield and fibre traits in Gossypium arboreum using Griffings numerical and Haymans graphical approach

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棉花研究(英文) 2023年第3期6卷 141-156页

作者： SUKRUTHA Bhimireddy RAJESWARI Sivakami PREMALATHA N. BOOPATHI narayana Manikanda THIRUKUMARAN K. MANIVANNAN A. Department of Cotton Centre for Plant Breeding and GeneticsTamil Nadu Agricultural UniversityCoimbatoreIndia O/O Directorate of Research Tamil Nadu Agricultural UniversityCoimbatoreIndia Department of Agronomy Central Farm UnitTamil Nadu Agricultural UniversityCoimbatoreIndia ICAR-Central Institute of Cotton Research Regional StationCoimbatoreIndia

Background For the purpose of utilising hybrid vigour to produce possible hybrids with a suitable level of stability,the knowledge of gene activity and combining ability is a crucial prerequisite before choosing desirable *** present study was carried out with six parents crossed in full diallel fashion and generated 30 F1 *** hybrids were evaluated in two replications in Randomized Block Design at Department of Cotton,TNAU for combining ability and gene *** analysis was carried out according to Griffing’s method-I(parents + F_(1) + reciprocals) and model-I and Hayman’s graphical approach by using INDOSTAT *** Analysis of variance for combining ability indicated that mean square values of GCA,SCA and reciprocals were highly significant for all the traits except for the uniformity ***763 and K12 showed highly positively significant GCA effects for most of the yield traits while PA838 and K12 for fibre quality traits,so they were found as best general ***379 × K12 and PDB29 × K12 for yield traits,and PDB29 × PA838,RG763 × PA838,and CNA1007 × RG763 cross combinations for fibre quality traits could be recommended for future breeding *** The results of both Griffing’s and Hayman’s approaches showed that non-additive gene action predominates as SCA variance was bigger than GCA variance,so heterosis breeding is thought to be a more fruitful option for enhancing GCA of many traits.

关键词： Gene action Combining ability Diallel analysis Hayman’s approach Griffing’s approach Vr-Wr graph Desi cotton