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Kinetics of thermally activated triplet fusion as a function of polymer chain packing in boosting the efficiency of organic light emitting diodes

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npj Flexible Electronics 2018年第1期2卷 244-252页

作者： Amrita Dey Naresh chandrasekaran Dwaipayan Chakraborty Priya Johari Christopher RMcNeill Akshay Rao Dinesh Kabra Department of Physics Indian Institute of Technology BombayPowaiMumbai 400076India IITB-Monash Research Academy IIT BombayMumbai 400076India Department of Materials Science and Engineering Monash UniversityWellington RoadClaytonVictoria 3800Australia Department of Physics School of Natural SciencesShiv Nadar UniversityGreater NoidaGautam Buddha NagarU.P.201314India Cavendish Laboratory University of CambridgeJJ Thomson AvenueCambridge CB30HEUK

Understanding the photophysical process governing the operation of the organic light emitting diodes(OLEDs)and how they are affected by film morphology is crucial to the efficient design of future *** particular,delayed fluorescence(DF),is known to contribute a significant fraction of the light emission from polymer-based OLEDs,but its mechanism remains ***,we investigate the origin of DF in the state of the art OLED polymer Poly(9,9-dioctylfluorene-alt-benzothiadiazole)(F8BT),under both optical and electrical excitation using time-resolved emission spectroscopy(TRES)as a function of film thickness,excitation fluence,magnetic-field,and *** temperature dependence of the DF for various film thicknesses suggests that thermally activated triplet migration is the dominant process controlling DF at room *** found that thermal activation energy(E_(eff))of triplet migration decreases from 179±31 meV to 86±11 meV as film thickness varied from~110 nm to~560 nm,*** Eeff of triplet migration is found to be a function of the molecular packing of polymer chains as determined from synchrotron grazing incidence wide angle x-ray scattering(GIWAXS)studies and steady-state photoluminescence *** chemical calculations of reorganization energy and singlet-triplet exchange energy gap in F8BT molecule as a function of the dihedral angle between donor&acceptor moiety also confirm the experimental *** results show that DF in polymer OLEDs is significantly affected by parameters such as the film thickness and disorder,allowing for a high degree of control over the underlying photophysics to be achieved.

关键词： diodes function packing

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Deep Learning Approach for Customer Records Prediction for Future Products Issues

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Journal of Computer and Communications 2019年第3期7卷 44-54页

作者： Sriramakrishnan chandrasekaran KTech Regional Delivery Center KPMG LLP Montvale NJ USA

Artificial neural networks consist of the mechanisms of identifying the solution for the problem with the layers design and implementation, and the hidden layers will have rules to be done by the model. The model consists of different approaches, and based on the priority and the requirement, we need to create a model, and this article is dealing with the prediction related to bank customers and their loan processing, etc. In this article, we have a global dataset collected related to 10000 customers of a single bank and their account and other details related to the customers of the bank. Here, we are implementing using tensor flow and Keras libraries to create an artificial neural network which will work on the model and hidden layers. The hidden layers are the most import part of the presentation, and the virtual environment in the field can be helpful for the better prediction of the related things. Machine learning implementations with the combination of deep learning artificial neural networks and also with tensor flow and Keras will be the most exciting and attractive portion of the research work in any field of science and technology. This architecture and application will help to predict future bank applications, and this can be helpful for the customers to understand their level of applications and products usage based on their account weight.

关键词： Machine Learning Neural Networks Tensor Flow Keras Virtual Environment Hidden Layers

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Microsurgical repair of severed thoracic spinal cord and clinical outcome:technical case report

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Chinese Neurosurgical Journal 2022年第4期8卷 300-306页

作者： chandrasekaran Kaliaperumal Department of Neurosurgery The Royal Infirmary of EdinburghLittle FranceEdinburgh EH164XAUK

Background:This report describes a case of successful repair of severed thoracic spine in a young man who presented with a penetrating stab injury to spine resulting in Brown-Séquard *** technique and postoperative management is *** presentation:A 34-year-old fit and well healthy man was admitted with a history of stab injury to the thoracic spine at thoracic T2/3 level with ASIA impairment score(AIS)score D with an incomplete spinal cord affecting his left lower limb with complete paralysis and right lower limb paresis with impaired sensation below T6 level to *** confirmed a penetrating knife injury traversing the T2/3 level causing hemi-section of the spinal cord confirmed *** underwent an urgent exploratory surgery of his spine and a T2/3 laminectomy was performed to aid removal of the *** dura was noted to be contused and severed spinal cord was noted to be severed with associated cord oedema.A microsurgical repair of the severed cord was performed with duroplasty followed by intense *** a 3 month follow up his AIS score is E with lower limb power is 5/5 bilaterally and he is able to mobilise independently up to 8-10 steps without any supportive aid and with crutches he is independently functional and ***:This is the first documented case of microsurgical repair of severed thoracic spinal cord secondary to traumatic knife *** the management of such scenario,apart from the removal of foreign body,repair of the cord with duroplasty should be carefully *** role of spinal neuroplasticity in healing following timely repair of the spinal cord along with intense rehabilitation remains the *** had resulted in a good clinical and functional outcome with in a 18-month follow up.

关键词： Spinal injury Stab injury Penetrating injury to spinal cord Spinal cord repair ASIA score Brown-Séquard syndrome

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Carbide derived carbon electrode with natural graphite addition in magnesium electrolyte based cell for supercapacitor enhancements

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Journal of Energy Chemistry 2015年第3期24卷 264-270页

作者： Ramasamy chandrasekaran Jesús Palma Marc Anderson Electrochemical Processes Unit Instituto IMDEA Energ?a3 Avda.Ramón de la SagraParque Tecnologico de Móstoles

Herein,we have presented a supercapacitor based on carbide derived carbon（CDC） electrode with natural graphite（NG） *** capacitor was analyzed at 22°C by cyclic voltammetry,galvanostatic charge-discharge and impedance techniques using a 0.5 mol/L of magnesium（II）bis（trifluoro methanesulfonyl） imide（Mg TFSI） in ethylene carbonate-propylene carbonate（EC ：PC = 1 ：1,v/v） as *** results conclude that the CDC cell enhancements have been proven by the composite electrode（5%–30% NG to CDC） especially on the cell efficiency and voltage i.e.,the CDC cell around 2.5 V limit was *** obtainable specific capacitance,real power and energy density are 15 F g-1,1.2 k W kg-1and 15 Wh kg-1,respectively.

关键词： supercapacitor carbide derived carbon magnesium imide organic electrolyte natural graphite

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Optimal Cost-Aware Paradigm for Off-Grid Green Cellular Networks in Oman

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Computers, Materials & Continua 2021年第8期68卷 2665-2680页

作者： Mohammed H.Alsharif Kannadasan Raju Abu Jahid Mahmoud A.Albreem Peerapong Uthansakul Jamel Nebhen Venkatesan chandrasekaran Department of Electrical Engineering College of Electronics and Information EngineeringSejong UniversitySeoul05006Korea Department of Electrical and Electronics Engineering Sri Venkateswara College of EngineeringSriperumbudurChennai602117India Department of Electrical and Computer Engineering University of OttawaOttawaK1N 6N5ONCanada Department of Electronics and Communications Engineering A’Sharqiyah UniversityIbra400Oman School of Telecommunication Engineering Suranaree University of TechnologyNakhon RatchasimaThailand Prince Sattam bin Abdulaziz University College of Computer Engineering and SciencesAlkharj11942Saudi Arabia

Green wireless networks or energy-efficient wireless networks have gained popularity as a research topic due to the ecological and economic concerns of cellular *** specific power supply requirements for the cellular base station,such as cost-effectiveness,efficiency,sustainability,and reliability,can be met by utilizing the technological advances in renewable *** are numerous drivers for the deployment of renewable energy technologies and the transition towards green *** energy is free,clean,and abundant in most locations throughout the ***,this work proposes a novel framework for energy-efficient solar-powered base stations for the Oman site,specifically for off-grid locations where fuel transportation for diesel generator(DG)is a serious *** demonstrate the effectiveness of the proposed system for off-grid sites,the Hybrid Optimization Model for Electric Renewables optimization software is adapted by considering real-time conditions and its technical *** cost factors such as capital cost,salvage cost,replacement cost,operational,and maintenance cost of PV panels,inverters,and batteries also undergo extensive *** the observed results,the total net present cost(NPC)of the proposed system is$27,887,while the net NPC of the DG is estimated at$32,***,the proposed scheme can potentially achieve considerable savings in the operational expenditure at approximately 15.24%.Indeed,these outcomes can provide profound economic,technical,and ecological benefits to the cellular operators of *** also ensures a sizeable reduction in greenhouse gas that supports sustainable green wireless network deployment in remote areas.

关键词： Wireless networks green wireless networks green communications sustainability OPEX

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Measurement of natural radionuclides in bricks and brick-making clays from Cuddalore district,Tamilnadu,India

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Nuclear Science and Techniques 2010年第4期21卷 218-220页

作者： G.Viruthagiri R.Ravisankar B.Rajamannan K.Thillaivelavan A.chandrasekaran V.Meenkshisundram Deptartment of physics Annamalai University Post Graduate and Research Department of Physics Govt.Arts College Department of Physics Govt.Arts College Department of Physics Sacred Heart College Radiological Safety Division Indira Gandhi Centre for Atomic Research(IGCAR)

In India,bricks as building materials are mainly prepared by clay using the deposited sediments of rivers,and the radionuclide contents in bricks and brick-making clays should vary with origin and geological *** this paper,the radionuclide contents of these materials from river bank areas of Cuddalore district,Tamilnadu India are measured by gamma ray spectrometer using NaI(Tl) detector,and compared with those of other *** radiation hazard indices,which are evaluated by radium-equivalent(Raeq) activity,are lower than that of NEA-OECD.

关键词：射线测量天然放射性核素制砖粘土印度放射性核素含量河流沉积物建筑材料

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INPHOVIS:Interactive visual analytics for smartphone-based digital phenotyping

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Visual Informatics 2023年第2期7卷 13-29页

作者： Hamid Mansoor Walter Gerych Abdulaziz Alajaji Luke Buquicchio Kavin chandrasekaran Emmanuel Agu Elke Rundensteiner Angela Incollingo Rodriguez Worcester Polytechnic Institute USA

Digital phenotyping is the characterization of human behavior patterns based on data from digital devices such as smartphones in order to gain insights into the users’state and especially to identify *** support supervised machine learning,digital phenotyping requires gathering data from study participants’smartphones as they live their ***,participants are then asked to provide ground truth labels about their health *** such complex data is challenging due to limited contextual information and imperfect health/wellness *** propose INteractive PHOne-o-typing VISualization(INPHOVIS),an interactive visual framework for exploratory analysis of smartphone health data to study *** visualization work has focused on mobile health data with clear semantics such as steps or heart rate data collected using dedicated health devices and wearables such as ***,unlike smartphones which are owned by over 85 percent of the US population,wearable devices are less prevalent thus reducing the number of people from whom such data can be *** contrast,the‘‘low-level"sensor data(e.g.,accelerometer or GPS data)supported by INPHOVIS can be easily collected using *** visualizations are designed to provide the essential contextualization of such data and thus help analysts discover complex relationships between observed sensor values and health-predictive *** guide the design of INPHOVIS,we performed a hierarchical task analysis of phone-o-typing requirements with health domain *** then designed and implemented multiple innovative visualizations integral to INPHOVIS including stacked bar charts to show diurnal behavioral patterns,calendar views to visualize day-level data along with bar charts,and correlation views to visualize important wellness predictive *** demonstrate the usefulness of INPHOVIS with walk-throughs of use *** also evaluated INPHOVIS with expert feedb

关键词： Interactive visual analytics Smartphone-sensed data Digital phenotyping

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Quantifying Kinematic Tremor in an NGLY1-Deficient Individual: A Case Study

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Case Reports in Clinical Medicine（临床医学病理报告） 2024年第1期

作者： Brock Futrell Christopher Alexander Malaya Dacia Martinez Diaz Christian Alfaro Hannah Elizabeth Gustafson Subhalakshmi chandrasekaran Rhea Mohan Phatak Bernhard Suter Charles Shannon Layne

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Powering Mobile Networks with Optimal Green Energy for Sustainable Development

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Computers, Materials & Continua 2021年第10期69卷 661-677页

作者： Mohammed H.Alsharif Mahmoud A.Albreem Abu Jahid Kannadasan Raju Peerapong Uthansakul Jamel Nebhen Venkatesan chandrasekaran Ayman A.Aly Department of Electrical Engineering College of Electronics and Information EngineeringSejong UniversityGwangjin-guSeoul05006Korea Department of Electronics and Communications Engineering A’Sharqiyah UniversityIbra400Oman Department of Electrical and Computer Engineering University of OttawaOttawaK1N 6N5ONCanada Department of Electrical and Electronics Engineering Sri Venkateswara College of EngineeringSriperumbudurChennai602117India School of Telecommunication Engineering Suranaree University of TechnologyNakhon RatchasimaThailand Prince Sattam Bin Abdulaziz University College of Computer Engineering and SciencesAlkharj11942Saudi Arabia Department of Mechanical Engineering College of EngineeringTaif UniversityTaif21944Saudi Arabia

Green wireless networking is an emerging area for many societies,especially academia and industry,in light of economic and ecological *** wireless infrastructures exploiting green power sources can enhance sustainability due to the adverse effects of conventional power sources and atmospheric ***,the specific power supply requirements for a base station(BS),such as cost effectiveness,efficiency,sustainability,and reliability,can be met by utilizing technological advances in renewable *** drivers and motivators are involved in the deployment of renewable energy technologies and the transition toward green *** energy is free,clean,and abundant in most locations throughout the *** this work,a sustainable optimal stand-alone solarpowered model envisioning green cellular BSs for urban locations in Oman is *** model can extend 24 h uninterrupted power supply support to a cellular BS that fully utilizes an integrated storage *** system analysis is conducted using a hybrid optimization model for electric renewables(HOMER)based on actual prevailing conditions of the regions and their technical *** results showed can be achieved operational expenditure savings up to 16%.These outcomes provide a huge benefit to the cellular operators of Oman economically,technically,and ecologically.

关键词： Wireless networks green wireless networks green communications sustainability OPEX

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Structural Health Monitoring of Offshore Buoyant Leg Storage and Regasification Platform:Experimental Investigations

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Journal of Marine Science and Application 2018年第1期17卷 87-100页

作者： Srinivasan chandrasekaran Thailammai Chithambaram Department of Ocean Engineering IIT MadrasChennaiTamil Nadu 600036India

Offshore platforms are of high strategic importance,whose preventive maintenance is on top *** Leg Storage and Regasification Platforms(BLSRP)are special of its kind as they handle LNG storage and processing,which are highly *** of structural health monitoring(SHM)to offshore platforms ensures safe operability and structural *** damages on the offshore platforms under rare events can be readily identified by deploying dense array of sensors.A novel scheme of deploying wireless sensor network is experimentally investigated on an offshore BLSRP,including postulated failure modes that arise from tether *** of the scaled model under wave loads is acquired by both wired and wireless sensors to validate the proposed *** wireless sensor network is used to trigger alert monitoring to communicate the unwarranted response of the deck and buoyant legs under the postulated failure *** triggers the alert mechanisms on exceedance of the measured data with that of the preset threshold values;alert mechanisms used in the present study include email alert and message pop-up to the validated user *** study is a prima facie of SHM application to offshore platforms,successfully demonstrated in lab scale.

关键词： Wireless sensor network Structural health monitoring Condition-based monitoring Response analysis Alert Monitoring System Underwater sensors Postulated failure

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