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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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Few-shot learning for screening 2D Ga2CoS4-x supported single-atom catalysts for hydrogen production

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Journal of Energy Chemistry 2025年第1期100卷 665-673页

作者： Nabil Khossossi Poulumi dey Department of Mechanical Engineering (ME) Delft University of Technology

Hydrogen generation and related energy applications heavily rely on the hydrogen evolution reaction（HER）,which faces challenges of slow kinetics and high *** electrocatalysts,particularly single-atom catalysts （SACs） on two-dimensional （2D） materials,are *** study presents a few-shot machine learning （ML） assisted high-throughput screening of 2D septuple-atomic-layer Ga2CoS4-xsupported SACs to predict HER catalytic ***,density functional theory （DFT）calculations showed that 2D Ga2CoS4is inactive for ***,defective Ga2CoS4-x（x=0–0.25）monolayers exhibit excellent HER activity due to surface sulfur vacancies （SVs）,with predicted overpotentials （0–60 mV） comparable to or lower than commercial Pt/C,which typically exhibits an overpotential of around 50 m V in the acidic electrolyte,when the concentration of surface SV is lower than 8.3%.SVs generate spin-polarized states near the Fermi level,making them effective HER *** demonstrate ML-accelerated HER overpotential predictions for all transition metal SACs on 2D *** DFT data from 18 SACs,an ML model with high prediction accuracy and reduced computation time was *** intrinsic descriptor linking SAC atomic properties to HER overpotential was *** study thus provides a framework for screening SACs on 2D materials,enhancing catalyst design.

关键词： Hydrogen production Electrocatalyst 2D material Density functional theory Machine learning Surface sulfur vacancy

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Effect of a less permeable stronger soil layer on the stability of non-homogeneous unsaturated slopes

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Frontiers of Structural and Civil Engineering 2020年第6期14卷 1462-1475页

作者： Nabarun dey Aniruddha SENGUPTA Department of Civil Engineering Indian Institute of Technology KharagpurKharagpur 721302India

Slope failure occurs due to an increase in the saturation level and a subsequent decrease in matric suction in unsaturated *** paper presents the results of a series of centrifuge experiments and numerical analyses on a 55°inclined unsaturated sandy slope with less permeable,stronger silty sand layer inclusion within *** is observed that a less permeable,stronger silty sand layer in an otherwise homogeneous sandy soil slope hinders the infiltration of *** water content of the slope just above the stronger layer increases significantly,compared to *** shear band is found to initiate in a homogeneous sandy soil slope,whereas for a non-homogeneous slope,they initiate just above the less pervious,stronger layer.A discontinuity of the shear zone is also observed for the case of a non-homogeneous soil *** factor of safety of a non-homogeneous,unsaturated soil slope decreases because of the less permeable,stronger *** decreases significantly if this less permeable,stronger soil layer is located near the toe of the slope.

关键词： non-homogeneous slope stronger soil layer factor of safety centrifuge model test unsaturated soils

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Chemical Reduction of CO_2 to Different Products during Photo Catalytic Reaction on TiO_2 under Diverse Conditions:an Overview

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Journal of Natural Gas Chemistry 2007年第3期16卷 217-226页

作者： G.R.dey Radiation and Photochemistry Division Bhabha Atomic Research CentreTrombayMumbai 400085India

The chemical reduction of CO2 remains a challenge with respect to the reversal of the oxidative degradation of any organic materials. The conversion of CO2 into useful substances is essential in developing alternative fuels and various raw materials for different industries. This also aids in preventing the continuous rise in tropospheric temperature due to the green house effect of CO2. In this article an overview of the growth taken place so far in the field of CO2 chemical reduction is pre- sented. The discussion comprises of photochemical methods for the development of different products, viz. CO, CH3OH and CH4, through chemical reduction of CO2. This includes the use of photo catalysts, mainly TiO2, and the role of a hole scavenger （such as 2-propanol） for this purpose.

关键词： CO2 chemical reduction H2 CH4 CO TiO2 hole scavenger photolysis

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Performance study and kinetic modeling of hybrid bioreactor for treatment of bi-substrate mixture of phenol-m-cresol in wastewater:Process optimization with response surface methodology

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Journal of Environmental Sciences 2013年第4期25卷 698-709页

作者： Sudipta dey Somnath Mukherjee Department of Biotechnology Heritage Institute of TechnologyAnandapurChowbaga RoadKolkata-700107West BengalIndia Environmental Engineering Division Civil Engineering DepartmentJadavpur UniversityRaja S.C.Mallic RoadKolkata-700032West BengalIndia

Performance of a hybrid reactor comprising of trickling filter （TF） and aeration tank （AT） unit was studied for biological treatment of wastewater containing mixture of phenol and m-cresol, using mixed microbial culture. The reactor was operated with hydraulic loading rates （HLR） and phenolics loading rates （PLR） between 0.222-1.078 m3/（m2-day） and 0.900-3.456 kg/（***）, respectively. The efficiency of substrate removal varied between 71%-100% for the range of HLR and PLR studied. The fixed film unit showed better substrate removal efficiency than the aeration tank and was more resistant to substrate inhibition. The kinetic parameters related to both units of the reactor were evaluated and their variation with HLR and PLR were monitored. It revealed the presence of substrate inhibition at high PLR both in TF and AT unit. The biofilm model established the substrate concentration profile within the film by solving differential equation of substrate mass transfer using boundary problem solver tool ＇bvp4c＇ of MATLAB 7. 1 software. Response surface methodology was used to design and optimize the biodegradation process using Design Expert 8 software, where phenol and m-cresol concentrations, residence time were chosen as input variables and percentage of removal was the response. The design of experiment showed that a quadratic model could be fitted best for the present experimental study. Significant interaction of the residence time with the substrate concentrations was observed. The optimized condition for operating the reactor as predicted by the model was 230 mg/L of phenol, 190 mg/L of m-cresol with residence time of 24.82 hr to achieve 99.92% substrate removal.

关键词： hybrid bioreactor bi-substrate phenol m-cresol response surface methodology biofilm model

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Accumulation of Polyphenolic Compounds and Osmolytes under Dehydration Stress and Their Implication in Redox Regulation in Four Indigenous Aromatic Rice Cultivars

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Rice science 2020年第4期27卷 329-344页

作者： Nivedita dey Soumen BHATTACHARJEE Plant Physiology and Biochemistry Research Laboratory/University Grants Commission Centre for Advanced Study Department of BotanyUniversity of BurdwanBurdwan 713104West BengalIndia

Present work was undertaken to screen some drought tolerant indigenous aromatic rice cultivars(IARCs),commonly cultivated in West Bengal,India,based on their capacity to produce osmolytes,redox-sensitive phenolic acids and flavonoids,as contrivances for redox-regulation under drought *** glycol induced post imbibitional dehydration stress mediated changes in redox regulatory properties of the germinating seeds of the four IARCs(Jamainadu,Tulaipanji,Sitabhog,Badshabhog),which were assessed in terms of changes in prooxidant accumulation(in-situ localization of reactive oxygen species(ROS)by confocal microscopy,DCFDA(2′,7′-dichlorofluorescin diacetate)oxidation,O2-and H2O2 accumulation),cumulative antioxidative defense(radical scavenging property and total thiol content),ROS scavenging phenolic acids(gallic acid,protocatechuic acid,gentisic acid,para-hydroxy benzoic acid,chlorogenic acid,caffeic acid,syringic acid,salicylic acid,sinapic acid and p-coumaric acid)and flavonoids(catechin,naringin,rutin,quercetin,kaempferol,myricetin and apigenin).The capability of germinating seeds to accumulate osmolytes(like glycinebetaine,proline,soluble carbohydrates and K+ion)and polyphenolic compounds was also correlated with their corresponding redox status and redox biomarkers(conjugated diene,hydroperoxide,thiobarbituric acid reactive substances and free carbonyl content)produced under the same *** results in general showed that accumulation of osmolytes along with the redox-sensitive phenolics and flavonoids conferred the ability to maintain the redox homeostasis under drought stress for the tolerant IARCs(Badshabhog and Tulaipanji).

关键词： aromatic rice drought polyphenolic compounds osmolytes redox regulation

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Statistical Inference of Exponentiated Moment Exponential Distribution Based on Lower Record Values

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Communications in Mathematics and Statistics 2017年第3期5卷 231-260页

作者： Devendra Kumar Tanujit dey Sanku dey Department of Statistics Central University of HaryanaJant-PaliMahendergarh 123031HaryanaIndia Department of Quantitative Health Sciences Cleveland ClinicClevelandOH 44121USA Department of Statistics St.Anthony’s CollegeShillongMeghalayaIndia

Based on lower record values,we first derive the exact explicit expressions as well as recurrence relations for the single and product moments of record values and then use these results to compute the means,variances and coefficient of skewness and kurtosis of exponentiated moment exponential distribution(EMED),a new extension of moment exponential distribution,recently introduced by Hasnain(Exponentiated moment exponential ***,2013).Next we obtain the maximum likelihood estimators of the unknown parameters and the approximate confidence intervals of the ***,we consider Bayes estimation under the symmetric and asymmetric loss functions using gamma priors for both shape and scale *** have also derived the Bayes interval of this distribution and discussed both frequentist and the Bayesian prediction intervals of the future record values based on the observed record *** Carlo simulations are performed to compare the performances of the proposed methods,and a data set has been analyzed for illustrative purposes.

关键词： Lower record values Single and product moments Recurrence relations Bayes estimator General entropy loss function Maximum likelihood estimator

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Optimum lateral extent of soil domain for dynamic SSI analysis of RC framed buildings on pile foundations

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Frontiers of Structural and Civil Engineering 2020年第1期14卷 62-81页

作者： Nishant SHARMA Kaustubh DASGUPTA Arindam dey Department of Civil Engineering Indian Institute of Technology GuwahatiGuwahati 781039India

This article describes a novel approach for deciding optimal horizontal extent of soil domain to be used for finite element based numerical dynamic soil structure interaction(SSI)*** model for a 12 storied building frame,supported on pile foundation-soil system,is developed in the finite element based software framework,*** different structure-foundation configurations are analyzed under different ground motion *** extent of soil domain,along with the soil properties,were varied exhaustively for a particular structural *** on the reduction in the variation of acceleration response at different locations in the SSI system(quantified by normalized root mean square error,NRMSE),the optimum lateral extent of the soil domain is prescribed for various structural widths,soil types and peak ground acceleration levels of ground *** to the past studies,error estimation analysis shows that the relationships prescribed in the present study are credible and more inclusive of the various factors that influence *** relationships can be readily applied for deciding upon the lateral extent of the soil domain for conducting precise SSI analysis with reduced computational time.

关键词： soil structure interaction optimum lateral extent of soil domain length multi-storyed framed building pile foundation OpenSEES L-K boundaries dynamic analysis

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Sequence Stratigraphic Model of Middle Permian Barakar Formation from a Marginal Gondwana Basin, India

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Journal of Earth Science 2018年第4期29卷 745-754页

作者： Joyjit dey Souvik Sen Coal India Limited Central Mine Planning and Design Institute (CMPD1) Regional Institute-3 Jharkhand 829 103 India Geologix Limited Dynasty Building Level-4 Wing-A Andheri Kurla Road Andheri (E) Mumbai 400 059 India

Gondwana deposits are extensively found across the continents. Here we study the Mid- dle Permian Barakar Formation from the marginal Gondwana Basin, eastern India, being deposited in a normal fault setting. Availability of extensive cores as well as geophysical log suites （gammaresistivity-density from drilled wells） from the study area helped us achieving high resolution interpretation. Core study identifies fluvial sedimentary architectures, which were correlated with the geophysical logs and modeled field-wide to understand vertical and horizontal facies disposition. The facies analysis has been used to establish a sequence stratigraphic model of the cyclic Barakar deposition. Four major fining upward depositional sequences were identified, each sequence comprises of low accommodation system tract （LAST） at base and high accommodation system tract （HAST） at top. LAST is characterized by vertically stacked, multistory amalgamated channel sandstone dominated facies, while floodplain dominated facies characterizes HAST, reflecting a gradual shift from braided to meandering depositional system from bottom to top of each cycle. Study reveals depocenter to be in the western part, supported by eastward thinning of sediment packets, all being deposited in a halfgraben setting.

关键词： fluvial sequence stratigraphy Gondwana sediment Middle Permian Barakar Formation.

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Assessment of bearing capacity of interfering strip footings located near sloping surface considering artificial neural network technique

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Journal of Mountain Science 2018年第12期15卷 2766-2780页

作者： Rana ACHARYYA Arindam dey Department of Civil Engineering Indian Institute of Technology Guwahati

The bearing capacity of interfering footings located near the slope face suffers from reduced bearing capacity due to the formation of the curtailed passive zone. Depending upon the position of the footing, their spacing and steepness of the slope different extents of bearing capacity reduction can be exhibited. A series of finite element investigation has been done with the aid of Plaxis 3 D v AE.01 to elucidate the influence of various geotechnical and geometrical parameters on the ultimate bearing capacity of interfering surface strip footings located at the crest of the natural soil slope. Based on the large database obtained from the numerical simulation, a6-8-1 Artificial Neural Network architecture has been considered for the assessment of the ultimate bearing capacity of interfering strip footings placed on the crest of natural soil slope. Sensitivity analyses have been conducted to establish the relative significance of the contributory parameters, which exhibited that for the stated problem, apart from shear strength parameters, the setback ratio and spacing of footing are the prime contributory parameters.

关键词： Interfering strip footing Natural slope Finite element simulation Artificial Neural Network Sensitivity analysis Prediction model

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