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Ru/NiMnB spherical cluster pillar for highly proficient green hydrogen electrocatalyst at high current density

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Journal of Energy Chemistry 2025年第1期100卷 397-408页

作者： md.Ahasan Habib Shusen Lin mehedi hasan Joni Sumiya Akter Dristy Rutuja Mandavkar Jae-Hun Jeong Jihoon Lee Department of Electronic Engineering College of Electronics and Information Kwangwoon University

Advanced OER/HER electrocatalytic alternatives are crucial for the wide adaptation of green hydrogen ***,Ru/NiMnB spherical cluster pillar （SCP）,denoted as Ru/NiMnB,is synthesized using a combination of electro-deposition and hydrothermal *** investigation of Ru doping in the NiMnB matrix revealed significant improvements in electrocatalytic *** Ru/NiMnB SCPs demonstrate superior OER/HER activity with low overpotentials of 150 and 103 mV at 50mA/cm2in 1 M KOH,making them highly competitive with state-of-the-art ***,the Ru/NiMnB SCPs exhibit a low 2-E cell voltage of 2.80 V at ultra-high current density of 2,000 m A/cm2in 1 M KOH,outperforming the standard benchmark electrodes of RuO2||Pt/C,thereby positioning Ru/NiMnB as one of the best bifunctional *** SCPs exhibit exceptional high-current characteristics,stability and corrosion resistance,as evidenced by continuous operation at 1,000 mA/cm2high-current density for over 150 h in 6 M KOH at elevated temperatures under harsh industrial *** a small amount of Ru incorporation significantly enhances the electrocatalytic performances of NiMnB,attributed to increased active sites and improved intrinsic properties such as conductivity,adsorption/desorption capability and reaction ***,Ru/NiMnB SCPs present a promising bi-functional electrode concept for efficient green H2production.

关键词： Potassium hydroxide

Exciton dynamics in 2D organic semiconductors

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Materials Futures 2022年第4期1卷 5-16页

作者： Ankur Sharma md.mehedi hasan Yuerui Lu School of Engineering College of Engineering and Computer ScienceThe Australian National UniversityCanberraACT 2601Australia

Two-dimensional(2D)semiconducting materials have been studied extensively for their interesting excitonic and optoelectronic properties arising from strong many-body interactions and quantum confinement at 2D *** of these materials have been inorganic,such as transition metal dichalcogenides,phosphorene,*** semiconductor materials,on the other hand been investigated for their excellent electrical conductivity and low dielectric coefficients for similar applications in the thin film or bulk material *** lack of crystallinity in the thin film and bulk phases has led to ambiguity over the excitonic and electronic/optical band gap *** recent emergence of 2D organic materials has opened a new domain of high crystallinity and controlled morphology,allowing for the study of low-lying excitonic states and optoelectronic *** have been demonstrated to have different excitonic properties compared with the Wannier–Mott excitons in inorganic 2D *** we present our recent experimental observations and analysis of 2D organic semiconductor *** discuss the role of high-crystalline and morphology-controlled growth of single-crystalline materials and their optoelectronic *** report explains the Frenkel(FR)and charge-transfer(CT)excitons and subsequent light emission and absorption properties in organic *** true nature of low-lying excitonic states,which arises from the interaction between CT and FR excitons,is experimentally studied and discussed to reveal the electronic band *** then discuss the pure FR behaviour we observed in J–type aggregated organic materials leading to coherent superradiant excitonic *** supertransport of excitons within the organic materials,facilitated by their pure FR nature,and the delocalization of excitons over a large number of molecules are also ***,we discuss the applications and our vision for these organic 2D materials in fast o

关键词： excitonic organic semiconductors two-dimensional

Design of a Simple Integrated Coupler for SPP Excitation in a Dielectric Coated Ag Thin Film

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Chinese Physics Letters 2014年第6期31卷 94-97页

作者： Rakibul hasan Sagor md. Ruhul Amin md. Ghulam Saber Department of Electrical and Electronic Engineering Islamic University of Technology Board Bazar Gazipur-1704 Bangladesh

A simple integrated coupler is proposed for the efficient excitation of surface plasmon polariton （SPP） mode in a thin metal film. The SPP mode is generated in a single Ag-dielectric interface by the incident field and coupled with an Ag thin film. The coupling efficiency at different wavelengths using two different dielectrics, gallium lanthanum sulfide （GLS） and aluminum gallium arsenide （AIGaAs） is calculated by analyzing the SPP propagation dynamics with the finite difference time domain method. A maximum coupling efficiency of 70~ is obtained at a wavelength of 46Ohm when GLS is used, whereas the corresponding value obtained for A1GaAs is 60~o at 56Onto. The proposed structure can be used to excite SPPs in a nano-thin film from an external bulky source and is easier to fabricate since a single interface metal-dielectric configuration is used to excite the metal-thin film.

关键词： ELECTRIC insulators & insulation NUMERICAL analysis SURFACE coatings NUCLEAR excitation EXCITATION spectrum POLARITONS SURFACE plasmons

iLBE for Computational Identification of Linear B-cell Epitopes by Integrating Sequence and Evolutionary Features

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Genomics, Proteomics & Bioinformatics 2020年第5期18卷 593-600页

作者： md.mehedi hasan Mst.Shamima Khatun Hiroyuki Kurata Department of Bioscience and Bioinformatics Kyushu Institute of TechnologyIizukaFukuoka 820-8502Japan Biomedical Informatics R&D Center Kyushu Institute of TechnologyIizukaFukuoka 820-8502Japan

Linear B-cell epitopes are critically important for immunological applications,such as vaccine design,immunodiagnostic test,and antibody production,as well as disease diagnosis and *** accurate identification of linear B-cell epitopes remains challenging despite several decades of *** this work,we have developed a novel predictor,Identification of Linear B-cell Epitope(i LBE),by integrating evolutionary and sequence-based *** successive feature vectors were optimized by a Wilcoxon-rank sum *** the random forest(RF)algorithm using the optimal consecutive feature vectors was applied to predict linear B-cell *** combined the RF scores by the logistic regression to enhance the prediction *** yielded an area under curve score of 0.809 on the training dataset and outperformed other prediction models on a comprehensive independent *** is a powerful computational tool to identify the linear B-cell epitopes and would help to develop penetrating diagnostic tests.A web application with curated datasets for iLBE is freely accessible at http://***/iLBE/.

关键词： Linear B-cell epitope BLAST Feature encoding Feature selection Random forest

Solution processed high performance perovskite quantum dots/ZnO phototransistors

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Nano Research 2022年第4期15卷 3660-3666页

作者： md.mehedi hasan Eric Moyen Jewel Kumer Saha md.Mobaidul Islam Arqum Ali Jin Jang Advanced Display Research Center(ADRC) Department of Information DisplayKyung Hee University26Kyungheedae-roDongdaemun-guSeoul 02447Republic of Korea

Phototransistors that can detect visible light have been fabricated using solution processed zinc oxide channel/zirconium oxide gate insulator thin film transistors(TFTs)and room temperature synthesized perovskite quantum dots(PeQDs)as active *** ZnO thin film transistors did not show a photocurrent under visible light ***,ZnO TFTs decorated with PeQDs exhibited enhanced photocurrent upon exposure to visible *** device had a responsivity of 567 A/W(617 A/W),a high detectivity of 6.59×10^(13)Jones(1.85×10^(14)J)and a high sensitivity of 10^(7)(10^(8))under green(blue)light at a low drain voltage of 0.1 *** high photo-responsivity and detectivity under green light resulted from the combination of short ligands in the QDs films and the high mobility of the spray coated ZnO *** results are relevant for the development of low cost and low energy consumption phototransistors working in the visible range.

关键词： ZnO thin film transistors perovskite quantum dots photo-detectors photo-transistors

Efficient Feature Selection and Machine Learning Based ADHD Detection Using EEG Signal

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Computers, Materials & Continua 2022年第9期72卷 5179-5195页

作者： md.Maniruzzaman Jungpil Shin md.Al mehedi hasan Akira Yasumura School of Computer Science and Engineering The University of AizuAizuwakamatsuFukushima965-8580Japan Faculty of Humanities and Social Science Kumamoto UniversityChuo-kuKumamotoJapan

Attention deficit hyperactivity disorder(ADHD)is one of the most common psychiatric and neurobehavioral disorders in children,affecting 11%of children *** study aimed to propose a machine learning(ML)-based algorithm for discriminating ADHD from healthy children using their electroencephalography(EEG)*** study included 61 children with ADHD and 60 healthy children aged 7–12 *** morphological and time-domain features were extracted from EEG *** t-test(p-value<0.05)and least absolute shrinkage and selection operator(LASSO)were used to select potential features of children with ADHD and enhance the classification *** selected potential features were used in four ML-based algorithms,including support vector machine(SVM),k-nearest neighbors,multilayer perceptron(MLP),and logistic regression,to classify ADHD and healthy *** overall prevalence of boys and girls with ADHD was 48.9%and 56.5%,*** average age of children with ADHD was 9.6±1.8 *** results illustrated that the combination of LASSO with SVM classifier achieved the highest accuracy of 94.2%,sensitivity of 93.3%,F1-score of 91.9%,and AUC of *** results also illustrated that MLP was the second-best ML-based classifier,which gave 93.4%accuracy,91.7%sensitivity,91.1%F1-score,and 0.960 *** findings indicated that the combination of the LASSO-based feature selection method and SVM classifier can be a useful tool for selecting reliable/potential features and classifying ADHD and healthy *** proposed ML-based algorithms could be useful for the early diagnosis of children with ADHD.

关键词： ADHD feature extraction feature selection classification machine learning

Investigation of accuracy of pavement mechanistic empirical prediction performance by incorporating Level 1 inputs

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Journal of Traffic and Transportation Engineering(English Edition) 2020年第2期7卷 259-268页

作者： md.mehedi hasan A.S.M.Asifur Rahman Rafiqul A.Tarefder Department of Civil Engineering University of New MexicoAlbuquerqueNM 87131USA Texas A&M Transportation Institute Texas A&M UniversityCollege StationTX 77845USA

The recently developed AASHTOWare pavement mechanistic empirical(M-E)design requires advanced characterization of pavement *** particular,M-E Level 1 analysis requires materials input parameters to be obtained from the laboratory test *** cooperation with the New Mexico Department of Transportation(Nmd.T),six pavement sites were selected to compare M-E Level 1 predicted performances from laboratory tested data with the field *** materials such as subgrade,base,asphalt concrete,binder,aggregate,etc.,were collected from these pavements sites during *** dynamic modulus,fatigue endurance limit(FEL),dynamic shear rheometer,and resilient modulus tests were conducted on the collected *** these parameters,pavement sections,as constructed,were modeled and analyzed in M-E at Levels 1,2 and *** predicted distress quantities for international roughness index(IRI)and rutting were compared with the field collected data as well as among the three design *** analysis results demonstrated that M-E overpredicts IRI and rutting in the pavement compared to the field *** was also observed that Level 1 showed the lowest rutting,whereas the maximum rutting was found at Level *** dynamic modulus of AC layer was underpredicted at Levels 2 and 3 resulting in higher rutting and IRI.

关键词： Pavement M-E Rutting Validation IRI Design

Nutrient dynamics associated with leaf litter decomposition of three agroforestry tree species (Azadirachta indica, Dalbergia sissoo, and Melia azedarach) of Bangladesh

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Journal of Forestry Research 2011年第4期22卷 577-582页

作者： Mahmood Hossain Mohammad Raqibul hasan Siddique md. Saidur Rahman md. Zaber Hossain md. Mahedi hasan Forestry and Wood Technology Discipline Khulna University Khulna - 9208 Bangladesh Soil Science Discipline Khulna University Khulna-9208 Forestry and Wood Technology Discipline Khulna University Khulna- 9208

Azadirachta indica A. Juss, Dalbergia, sissoo Roxb., and Melia azedarach L. are little studied species in nutrient return capabilities from leaf litter decomposition to maintenance of the soil fertility despite their importance in agroforestry practices of Bangladesh. A leaf litter decomposition experiment was conducted using a litterbag teeh7 nique to assess the nutrient reaun efficiency of these species. The de- composition rate of leaf litter was highest for M. azedarach and lowest for D. sissoo. Rainfall and temperature of study sites showed a significant （p〈0.05） positive relationship with the rate of leaf litter decomposition. The highest decay constant was observed for M. azedarach （6.67）. Nitrogen and Phosphorus concentration in leaf litter showed a decreased trend sharply at the end of the first month, whereas rapid decrease of Potassium concentration was reported within 10 days. Conversely, higher concentration of nutrient was observed at the later stages of decomposition. All three species showed a similar pattern of nutrient release （K 〉 N 〉 P） during the decomposition process of leaf litter. Among the studied species, D. sissoo was best in terms of N and P return and A. indica was best in terms of K return.

关键词： agroforestry decay constant decomposition leaf litter andnutrient dynamics

Characterization of subgrade soil mixed with recycled asphalt pavement

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Journal of Traffic and Transportation Engineering(English Edition) 2018年第3期5卷 207-214页

作者： md.mehedi hasan md.Rashadul Islam Rafiqul A.Tarefder Department of Civil Engineering University of New Mexico Civil Engineering Technology Colorado State University-Pueblo

Due to awareness to greener environment, use of recycled asphalt material has become popular in asphalt pavement industry. The use of recycled asphalt pavement （RAP） ma- terials in subgrade soil can be an additional scope of utilizing RAP. This study investigates the effect of RAP on the resilient modulus （MR） of subgrade soils mixed with RAP materials. Note that MR is the principal material input parameter for designing asphalt pavement using the recent mechanistic-empirical pavement design software. As a first step of the current study, different percentages of RAP and moisture were thoroughly mixed with subgrade soils. Then, the MR of these RAP mixed soils were determined using the AASHTO T 307 （1999） at different stress levels in the laboratory. Results show that the MR of RAP mixed soil increases with the applied deviatoric and bulk stresses, however, it is less sensitive to applied confining pressure. Use of RAP materials has made the soils stiff enough not to respond to the confining pressure. As expected, the MR value reaches a maximum at the optimum moisture content and increases linearly with RAP content. The MR values and characteristics of the RAP mixed subgrade soils, as determined by the current study, can be used for subgrade design and stabilization using RAP for better pavement design.

关键词： Subgrade Recycled asphalt pavement Moisture Resilient modulus Stress