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Corrosion Communications 2022年第3期7卷 51-62页

作者： raman kumar Gurmeet Singh Department of Chemistry University of Delhi Department of Chemical and Biomolecular Engineering Yonsei University Pondicherry University

This paper presents an economically viable and sustainable method to combat depletion of extensively used mild steel alloy in industries exposed to a stagnant 0.5 mol/L sulphuric acid（H2SO4） environment via a newly synthesized and characterized inhibitor namely 3-（2-amino-3-methylphenyl）imino)methyl)benzaldehyde（AMMB）. The fabrication of this additive was performed at room temperature（298 K） using eco-friendly solvents and reactants. The highest protection efficiency recorded was 98.73% at 298 K temperature. Comprehensive nature of the corrosion inhibition mechanism was ascertained using state of the art electrochemical（galvanostatic polarization, LPR, and EIS） and morphological（ATR, AFM, SEM-EDS） studies. These investigations also revealed the formation of complexes between metal and inhibitor molecules. The complexes formed on the metal substrate encase the entire surface, which accounts for the observed high inhibition efficiency. The quantum mechanical modeling of AMMB molecule and temperature kinetics study supplemented the predicted results from preceding techniques.

关键词： Polarization techniques Corrosion Density functional theory Impedance Atomic force microscopy Surface characterization

Prediction of Alzheimer’s Using Random Forest with Radiomic Features

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Computer Systems Science & Engineering 2023年第4期45卷 513-530页

作者： Anuj Singh raman kumar Arvind kumar Tiwari KNIT Sultanpur Sultanpur228118India

Alzheimer’s disease is a non-reversible,non-curable,and progressive neurological disorder that induces the shrinkage and death of a specific neuronal population associated with memory formation and *** is a frequently occurring mental illness that occurs in about 60%–80%of cases of *** is usually observed between people in the age group of 60 years and *** upon the severity of symptoms the patients can be categorized in Cognitive Normal(CN),Mild Cognitive Impairment(MCI)and Alzheimer’s Disease(AD).Alzheimer’s disease is the last phase of the disease where the brain is severely damaged,and the patients are not able to live on their *** is an approach to extracting a huge number of features from medical images with the help of data characterization ***,105 number of radiomic features are extracted and used to predict the alzhimer’*** paper uses Support Vector Machine,K-Nearest Neighbour,Gaussian Naïve Bayes,eXtreme Gradient Boosting(XGBoost)and Random Forest to predict Alzheimer’s *** proposed random forest-based approach with the Radiomic features achieved an accuracy of 85%.This proposed approach also achieved 88%accuracy,88%recall,88%precision and 87%F1-score for AD ***,it achieved 72%accuracy,73%recall,72%precisionand 71%F1-score for AD *** and it achieved 69%accuracy,69%recall,68%precision and 69%F1-score for MCI *** comparative analysis shows that the proposed approach performs better than others approaches.

关键词： Alzheimer’s disease radiomic features cognitive normal support vector machine mild cognitive impairment extreme gradient boosting random forest

Convergence of Weak Galerkin Finite Element Method for Second Order Linear Wave Equation in Heterogeneous Media

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Numerical Mathematics(Theory,Methods and Applications) 2023年第2期16卷 323-347页

作者： Bhupen Deka Papri Roy Naresh kumar raman kumar Department of Mathematics Indian Institute of Technology GuwahatiGuwahati 781039India

Weak Galerkin finite element method is introduced for solving wave equation with interface on weak Galerkin finite element space(Pk(K),P_(k−1)(∂K),[P_(k−1)(K)]^(2)).Optimal order a priori error estimates for both space-discrete scheme and implicit fully discrete scheme are derived in L1(L2)*** method uses totally discontinuous functions in approximation space and allows the usage of finite element partitions consisting of general polygonal *** element algorithm presented here can contribute to a variety of hyperbolic problems where physical domain consists of heterogeneous media.

关键词： Wave equation heterogeneous medium finite element method weak Galerkin method semidiscrete and fully discrete schemes optimal error estimates

Driving Style Recognition System Using Smartphone Sensors Based on Fuzzy Logic

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Computers, Materials & Continua 2021年第11期69卷 1967-1978页

作者： Nidhi Kalra raman kumar Goyal Anshu Parashar Jaskirat Singh Gagan Singla Department of Computer Science and Engineering Thapar Institute of Engineering and TechnologyPatiala147001PunjabIndia Computer Science and Engineering University Institute of Engineering and TechnologyPanjab University160014ChandigarhIndia

Every 24 seconds,someone dies on the road due to road accidents and it is the 8th leading cause of death and the first among children aged 15–29 years.1.35 million people globally die every year due to road traffic *** additional 20–50 million suffer from non-fatal injuries,often resulting in longterm *** costs around 3%of Gross Domestic Product to most countries,and it is a considerable economic *** governments have taken various measures such as better road infrastructures and strict enforcement of motor-vehicle laws to reduce these ***,there is still no remarkable reduction in the number of *** ensure driver safety and achieve vision of zero accidents,there is a great need to monitor drivers’driving *** of the existing driving behavior monitoring solutions are based on expensive hardware *** most people are using smartphones in the modern era,a system based on mobile application is proposed,which can reduce the cost for developing intelligent transport systems(ITS)to a large *** this paper,we utilize the accelerometer sensor data and the global positioning system(GPS)sensor deployed in smartphones to recognize driving and speeding events.A driving style recognition system based on fuzzy logic is designed to classify different driving styles and control reckless driving by taking the longitudinal/lateral acceleration and speed as input ***,the proposed system uses fuzzy logic rather than taking the crisp values of the *** indicate that the proposed system can classify reckless driving based on fuzzy logic and,therefore,reduce the number of accidents.

关键词： Fuzzy logic accelerometer global positioning system driving style

Oxide ancillary ligand-based europium β-diketonate complexes and their enhanced luminosity

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Rare Metals 2021年第10期40卷 2873-2881页

作者： Devender Singh Shri Bhagwan Anuj Dalal Kapeesha Nehra raman kumar Saini Kapoor Singh Anura Priyajith Simantilleke Sumit kumar Ishwar Singh Department of Chemistry Maharshi Dayanand UniversityRohtak 124001India Centre de Fisica Universidade of MinhoBraga 4710057Portugal Department of Chemistry DCR University of Science and TechnologyMurthal 131039India

Ternary materials of europium complex with2,2,6,6-tetramethyl-3,5-heptanedione(tmhd) ligand and aqua ligand as ancillary ligands have been prepared and characterized for various optoelectronic *** of hydrated complex [Eu(tmhd)_(3)(H_(2)O)_(2)] proceeded with triphenylphosphine oxide(TPPO) and pyridine-N-oxide(PNO) ancillary ligands were studied to develop novel complexes. The prepared complexes show good thermal stability. A comparative investigation of preparedmaterials[Eu(tmhd)_(3)(H_(2)O)_(2)],[Eu(tmhd)_(3)(TPPO)_(2)] and [Eu(tmhd)_(3)(PNO)_(2)] was conducted for their luminescent behaviors in order to obtain the role of ancillary ligand in the enhancement of illumination amount generated from europium(Eu^(3+)) ion. Color coordinates of prepared ternary complexes such as[Eu(tmhd)_(3)(H_(2)O)_(2)]with(x = 0.54,y = 0.32),[Eu(tmhd)_(3)(TPPO)_(2)] with(x = 0.56, y = 0.32) and[Eu(tmhd)_(3)(PNO)_(2)] with(x = 0.57, y = 0.33) indicated that these materials exhibited bright red emission in visible region spectrum. The complexes show a proficient energy transport pathway from the ligands to the innermost Eu^(3+)by means of an ancillary ligand-sensitized luminescence process. Interaction between the metal and ligand results in a distinguished effect on quantum efficiency(η) as well as on Judd–Ofelt intensity factor(Ω_(2)) of the prepared materials.

关键词： Ternary Eu^(3+)complexes Red emissive materials Photoluminescence Quantum efficiency Judd-Ofelt intensity Optoelectronic devices

Obtaining Crisp Priorities for Triangular and Trapezoidal Fuzzy Judgments

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Computer Systems Science & Engineering 2022年第4期41卷 157-170页

作者： raman kumar Goyal Jaskirat Singh Nidhi Kalra Anshu Parashar Gagan Singla Sakshi Kaushal Computer Science and Engineering Department Thapar Institute of Engineering and TechnologyPatialaPunjabIndia Computer Science and Engineering University Institute of Engineering and TechnologyPanjab UniversityChandigarhIndia

This paper proposes anoptimal fuzzy-based model for obtaining crisp priorities for Fuzzy-AHP comparison *** judgments cannot be given for real-life situations,as most of these include some level of fuzziness and *** these situations,judgments are represented by the set of fuzzy *** of the fuzzy optimization models derive crisp priorities for judgments repre-sented with Triangular Fuzzy Numbers(TFNs)*** do not work for other types of Triangular Shaped Fuzzy Numbers(TSFNs)and Trapezoidal Fuzzy Numbers(TrFNs).To overcome this problem,a sum of squared error(SSE)based optimization model is *** some other methods,the proposed model derives crisp weights from all of the above-mentioned fuzzy judgments.A fuzzy number is simulated using the Monte Carlo method.A threshold-based constraint is also applied to minimize the deviation from the initial *** Algorithm(GA)is used to solve the optimization *** have also conducted casestudiesto show the proposed approach’s advantages over the *** show that the proposed model outperforms other models to minimize SSE and deviation from initial ***,the proposed model can be applied in various real time scenarios as it can reduce the SSE value upto 29%compared to the existing studies.

关键词： Analytic hierarchy process comparison matrices priority vectors fuzzy judgments triangular fuzzy numbers triangular-shaped fuzzy numbers trapezoidal fuzzy numbers

Familial aggregation and heritability for cardiovascular risk factors: a family based study in Punjab, India

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Natural Science 2010年第7期2卷 732-736页

作者： raman kumar Bdarud Doza 不详

Background: It is well established that the people with elevated SBP, DBP, BMI and WHR are more prone to cardiovascular disease. However, very few studies have focused on the amount of familial aggregation and heritability of these cardiovascular risk factors in Indian population. Therefore, purpose of this study was to investigate the familial aggregation of blood pressures with respect to certain anthropometric traits and to determine the relative roles of heredity in the etiology of SBP and DBP in a sample of families with three generations. Methods: The study has been conducted through house to house family study among three generations such as offspring, parent and grandparent in a scheduled caste community (Ramdasia) in Punjab. A total of 1400 individuals, constituting 380 families were surveyed for blood pressure, pulse rate, pulse pressure and anthropometric measurements to study familial aggregation and heritability for cardiovascular risk factors. The analysis represents a multivariate model which includes the each individual family data for estimation of familial correlation and heritability. Results: All risk factors showed positive familial correlation but magnitudes are different in va rious pairs of combination. Correlations generally are higher among genetically close relatives such as brothersisters or parentoffspring and are lower among spouses. The estimated heri tabilities were 22% for systolic and 27% for diastolic blood pressure, 19% for BMI and 17% for WHR. Conclusions: These results indicate a strong familial aggregation of cardiovascular risk factors such as SBP and DBP in this population and also showed that this familial influence can be detected from anthropometric mea surements and genetic closeness. Almost all anthropometric variables were found to be significant with blood pressures among three ge nerations.

关键词： Familial Aggregation Heritability Risk Factors Ramdasia Population Punjab

A Note on the Effect of Negative Poisson’s Ratio on the Deformation of a Poroelastic Half-Space by Surface Loads

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Engineering（科研） 2010年第6期2卷 432-437页

作者： Sunita Rani raman kumar Sarva Jit Singh 不详

The aim of this note is to study the effect of negative Poisson’s ratio on the quasi-static deformation of a poroelastic half-space with anisotropic permeability and compressible fluid and solid constituents by surface loads. Two particular cases considered are: two-dimensional normal strip loading and axisymmetric normal disc loading. It is found that a negative Poisson’s ratio makes the Mandel-Cryer effect more prominent. It also results in an increase in the magnitude of the surface settlement.

关键词： Anisotropic Permeability Auxetic Material Negative Poisson’s Ratio Poroelastic Half-Space Quasi-Static Deformation Surface Loading

Direct laser writing of volumetric gradient index lenses and waveguides

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Light(Science & Applications) 2020年第1期9卷 89-102页

作者： Christian R.Ocier Corey A.Richards Daniel A.Bacon-Brown Qing Ding raman kumar Tanner J.Garcia Jorik van de Groep Jung-Hwan Song Austin J.Cyphersmith Andrew Rhode Andrea N.Perry Alexander J.Littlefield Jinlong Zhu Dajie Xie Haibo Gao Jonah F.Messinger Mark L.Brongersma Kimani C.Toussaint Jr Lynford L.Goddard Paul V.Braun Department of Materials Science and Engineering University of Illinois at Urbana-ChampaignUrbanaILUSA Materials Research Laboratory University of Illinois at Urbana-ChampaignUrbanaILUSA Beckman Institute for Advanced Science and Technology University of Illinois at Urbana-ChampaignUrbanaILUSA Department of Electrical and Computer Engineering University of Illinois at Urbana-ChampaignUrbanaILUSA Department of Materials Science and Engineering Stanford UniversityStanfordCAUSA Carl R.Woese Institute for Genomic Biology University of Illinois at Urbana-ChampaignUrbanaILUSA Department of Mechanical Science and Engineering University of Illinois at Urbana-ChampaignUrbanaILUSA

Direct laser writing(DLW)has been shown to render 3D polymeric optical components,including lenses,beam expanders,and mirrors,with submicrometer ***,these printed structures are limited to the refractive index and dispersive properties of the ***,we present the subsurface controllable refractive index via beam exposure(SCRIBE)method,a lithographic approach that enables the tuning of the refractive index over a range of greater than 0.3 by performing DLW inside photoresist-filled nanoporous silicon and silica *** the laser exposure during printing enables 3D submicron control of the polymer infilling and thus the refractive index and chromatic *** SCRIBE’s unprecedented index range and 3D writing accuracy has realized the world’s smallest(15μm diameter)spherical Luneburg lens operating at visible ***’s ability to tune the chromatic dispersion alongside the refractive index was leveraged to render achromatic doublets in a single printing step,eliminating the need for multiple photoresins and writing *** also has the potential to form multicomponent optics by cascading optical elements within a *** a demonstration,stacked focusing structures that generate photonic nanojets were fabricated inside porous ***,an all-pass ring resonator was coupled to a subsurface 3D *** measured quality factor of 4600 at 1550 nm suggests the possibility of compact photonic systems with optical interconnects that traverse multiple *** is uniquely suited for constructing such photonic integrated circuits due to its ability to integrate multiple optical components,including lenses and waveguides,without additional printed supports.

关键词： index refractive render

Solar photovoltaic fed dual input LED lighting system with constant illumination control

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Frontiers in Energy 2016年第4期10卷 473-478页

作者： Kinattingal SUNDARESWARAN Kevin Ark kumar Payyalore raman VENKATESWARAN Sankaran PALANI Department of Electrical and Electronics Engineering National Instituteof Technology Tiruchirappalli 620015 India Bharat Heavy Electricals Limited Tiruchirappalli 620014 India Sudharsan Engineering College Pudukkottai 622501 India

A dual input LED lighting scheme with constant illumination is proposed in this paper. The scheme employs a photovoltaic array as the first input and a battery as the second one. A microcontroller is programmed to operate a changeover switch as well as a DC-DC converter for uninterrupted and constant illumina- tion in work place. The scheme is suitable for conference halls, laboratories, clean rooms, marriage halls, theaters, etc. The complete modeling, design and experimentation of the proposed scheme are explained and the economic viability of the scheme is justified.

关键词： photovoltaic LED light dual input P&O algorithm