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Exploring one material for dual applications:A red-emitting Mg_(2)GeO_(4):Eu^(3+)nanophosphor for future generation energy efficient WLEDs and dosimetric applications

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Journal of Rare Earths 2024年第10期42卷 1835-1845页

作者： Akshay Arjun G.P.Darshan S.C.Sharma h.Nagabhushana D.V.Sunitha h.b.premkumar Department of Physics Faculty of Mathematical and Physical SciencesM.S.Ramaiah University of Applied SciencesBengaluru560054India honorary Professor of Law and Forensic Materials Jain UniversityBengaluru560069India C.N.R.Rao Centre for Advanced Materials Tumkur UniversityTumkur572103India School of Applied Sciences(Physics) REVA UniversityBengaluru560064India

The envisaged design and developme nt of individual mate rials to excavate a broader spectrum of desired properties and offer multiple applications are highly *** this in mind,a series of forsterite-structured Mg_(2)GeO_(4):Eu^(3+)(1 mol%-9 mol%)nanophosphors was synthesized via a solution combustion method using oxalyl dihydrazide as a *** X-ray diffraction patterns confirm the orthorhombic crystal system with a Puma space *** results clearly show irregularly shaped cluster-like structures with aggregation of the *** diffuse reflectance spectra,the optical energy band gap of the Mg_(2)GeO_(4):Eu^(3+)(1 mol%-9 mol%)nanophosphors was estimated and obtained to be~4.12-4.32 *** photoluminescence emission spectra exhibit intense peaks at^(5)79,589,610,661,and 707 nm,which are due to characteristic^(5)D_(0)→^(7)F_(0),^(5)D_(0)→^(7)F_(1),^(5)Do→^(7)F_(2),^(5)D_(0)→^(7)F_(3)and^(5)D_(0)→^(7)F_(4)transitions of Eu^(3+)ions,*** Commission International de L'Eclairage color coordinates are gradually tuned from pale red(0.5980,0.4012)to a pure red(0.6385,0.3611)*** glow peaks showcase excellent super-linear response at low doses ofγ-irradiations,indicating that the prepared phosphor can be used in thermoluminescent personal dosimetry which is a biological tissue *** aforementioned results demonstrate that the prepared Mg_(2)GeO_(4):Eu^(3+)(1 mol%-9 mol%)nanophosphors are considered an excellent candidate for dual applications,i.e.,red component in future generation white-light-emitting diodes(WLEDs)and personal dosimetric applications.

关键词： Nanophosphors Photoluminescence Thermoluminescence Dosimetry Photometric properties Rare earths

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Multi-Objective Grey Wolf Optimization Algorithm for Solving Real-World bLDC Motor Design Problem

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Computers, Materials & Continua 2022年第2期70卷 2435-2452页

作者： M.premkumar Pradeep Jangir b.Santhosh Kumar Mohammad A.Alqudah Kottakkaran Sooppy Nisar Department of Electrical and Electronics Engineering GMR Institute of TechnologyRajam532127Andhra PradeshIndia Rajasthan Rajya Vidyut Prasaran Nigam Sikar332025RajasthanIndia Department of Computer Science and Engineering GMR Institute of TechnologyRajam532127Andhra PradeshIndia German Jordanian University Amman11180Jordan Department of Mathematics College of Arts and SciencesPrince Sattam Bin Abdulaziz UniversityWadi Aldawaser11991Saudi Arabia

The first step in the design phase of the brushless Direct Current(bLDC)motor is the formulation of the mathematical framework and is often used due to its analytical ***,the bLDC motor design problem is considered to be an optimization *** this paper,the analytical model of the bLDC motor is presented,and it is considered to be a basis for emphasizing the optimization *** analytical model used for the experimentation has 78 non-linear equations,two objective functions,five design variables,and six non-linear constraints,so the bLDC motor design problem is considered as highly non-linear in electromagnetic ***-objective optimization becomes the forefront of the current research to obtain the global best solution using metaheuristic *** bio-inspired multi-objective grey wolf optimizer(MOGWO)is presented in this paper,and it is formulated based on Pareto optimality,dominance,and archiving *** performance of theMOGWO is verified on standard multi-objective unconstraint benchmark functions and applied to the bLDC motor design *** results proved that the proposedMOGWO algorithm could handle nonlinear constraints in electromagnetic optimization *** performance comparison in terms of Generational Distance,inversion GD,hypervolume-matrix,scattered-matrix,and coverage metrics proves that the MOGWO algorithm can provide the best solution compared to other selected *** source code of this paper is backed up with extra online support at https://***/mysite and https://***/matlabcentral/fileexchange/75259-multiobjective-non-sorted-grey-wolf-mogwo-nsgwo.

关键词： bLDC motor electromagnetics metaheuristic multi-objective grey wolf optimizer

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bhGSO:binary hunger Games Search Optimization Algorithm for Feature Selection Problem

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Computers, Materials & Continua 2022年第1期70卷 557-579页

作者： R.Manjula Devi M.premkumar Pradeep Jangir b.Santhosh Kumar Dalal Alrowaili Kottakkaran Sooppy Nisar Department of Computer Science and Engineering Kongu Engineering CollegePerundurai638060Tamil NaduIndia Department of Electrical and Electronics Engineering Dayananda Sagar College of EngineeringBengaluru560078KarnatakaIndia Rajasthan Rajya Vidyut Prasaran Nigam Sikar332025RajasthanIndia Department of Computer Science and Engineering Guru Nanak Institute of TechnologyHyderabad501506TelanganaIndia Mathematics Department College of ScienceJouf UniversitySakakaP.O.Box:2014Saudi Arabia Department of Mathematics College of Arts and SciencesPrince Sattam bin Abdulaziz UniversityWadi Aldawaser11991Saudi Arabia

In machine learning and data mining,feature selection(FS)is a traditional and complicated optimization *** the run time increases exponentially,FS is treated as an NP-hard *** researcher’s effort to build a new FS solution was inspired by the ongoing need for an efficient FS framework and the success rates of swarming outcomes in different optimization *** paper presents two binary variants of a hunger Games Search Optimization(hGSO)algorithm based on V-and S-shaped transfer functions within a wrapper FS model for choosing the best features from a large *** proposed technique transforms the continuous hGSO into a binary variant using V-and S-shaped transfer functions(bhGSO-V and bhGSO-S).To validate the accuracy,16 famous UCI datasets are considered and compared with different state-of-the-art metaheuristic binary *** findings demonstrate that bhGSO-V achieves better performance in terms of the selected number of features,classification accuracy,run time,and fitness values than other state-of-the-art *** results demonstrate that the bhGSO-V algorithm can reduce dimensionality and choose the most helpful features for classification *** proposed bhGSO-V achieves 95%average classification accuracy for most of the datasets,and run time is less than 5 *** low and medium dimensional datasets and less than 10 sec for high dimensional datasets.

关键词： binary optimization feature selection machine learning hunger games search optimization

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Non-relativistic scattering amplitude for a new multi-parameter exponential-type potential

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Chinese Physics b 2016年第8期25卷 21-25页

作者： Yazarloo b h Mehraban h hassanabadi h Physics Department Semnan University Physics Department Shahrood University of Technology

In this paper, we study the scattering properties of s-wave Schrdinger equation for the multi-parameter potential,which can be reduced into four special cases for different values of potential parameters, i.e., hulthn, Manning–Rosen,and Eckart potentials. We also obtain and investigate the scattering amplitudes of these special cases. Some numerical results are also obtained and reported.

关键词： scattering amplitude Schrodinger equation multi-parameter potential phase shifts cross section

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hospitalized for poverty:orthopaedic discharge delays due to financial hardship in a tertiary hospital in Northern Tanzania

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Global health Research and Policy 2022年第1期7卷 204-211页

作者： Joy E.Obayemi Elizabeth b.Card Octavian Shirima Ajay premkumar honest Massawe Neil P.Sheth Perelman School of Medicine University of PennsylvaniaPhiladelphiaUSA Kilimanjaro Christian Medical Centre(KCMC) MoshiTanzania hospital for Special Surgery NewYorkUSA Pennsylvania hospital Hospital of the University of PennsylvaniaPhiladelphiaUSA

background:Musculoskeletal injury contributes significantly to the burden of disease in Tanzania and other *** hospitals to cope financially with this burden,they often mandate that patients pay their entire hospital bill before leaving the *** creates a phenomenon of patients who remain hospitalized solely due to financial *** study aims to characterize the impact of this policy on patients and hospital systems in resource-limited ***:A mixed-methods study using retrospective medical record review and semi-structured interviews was conducted at a tertiary hospital in Moshi,*** regarding patient demographics,injury type,days spent in the ward after medical clearance for discharge,and hospital invoices were collected and analyzed for orthopaedic patients treated from November 2016 to June ***:346 of the 867 orthopaedic patients(39.9%)treated during this time period were found to have spent additional days in the hospital due to their inability to pay their hospital *** these patients,72 patient charts were *** 72 patients spent an average of 9 additional days in the hospital due to financial hardship(range:1-64 days;interquartile range:2-10.5 days).They spent an average of 112,958 Tanzanian Shillings(TSh)to pay for services received following medical clearance for discharge,representing 12.3%of the average total bill(916,840 TSh).646 hospital bed-days were spent on these 72 patients when they no longer clinically required hospitalization.7(9.7%)patients eloped from the hospital without paying and 24(33.3%)received financial assistance from the hospital’s social welfare ***:Many patients do not have the financial capacity to pay hospital fees prior to *** reality has added significantly to these patients’overall financial hardship and has taken hundreds of bed-days from other critically ill *** single-institution,cross-sectional study provides a deeper u

关键词： Global surgery Orthopedic injury Road traffic crash health policy Ethics Financial hardship LMIC

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Cytokinin induced shoot regeneration and flowering of Scoparia dulcis L.(Scrophulariaceae)-an ethnomedicinal herb

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Asian Pacific Journal of Tropical biomedicine 2011年第3期1卷 169-172页

作者： premkumar G Sankaranarayanan R Jeeva S Rajarathinam K Department of botany Virudhunagar Hindu Nadars' Senthikumara Nadar College Department of Floriculture and Medicinal Crops Horticulture College and Research Institute Centre for biodiversity and biotechnology Department of BotanyN.M.Christian College

Objective:To develop an improved protocol for micropropagation of ethnomedicinally important Scoparia dulcis(***) ***:Explants were inoculated on MS basal medium supplemented with kinelin and 6-benzylaminopurine for shoot bud *** enhance the shoot induction,various auxins like 3-indoleacetic acid or 3-indolebutyric acid or a-naphthylacetic acid were tested along with 2.32 M KI and 4.44 μ M *** regenerated shoots were rooted in half strength MS medium supplemented with various concentrations of IAA,IbA or *** roots were developed,the plantlets were transplanted to pots filled with vermiculate and sand and kept in growth chamber with 70%-80%humidity under 16 h *** acclimatization,the plantlets were transferred to the garden and survival percentage was *** were statistically analyzed and means were compared using Duncan's multiple range test(Phod was developed to induce high frequency shoots regeneration from stem,mature leaf and young leaf explants of *** induction on young leaf explants was most successful in MS medium supplemented with combination of two cytokinins(2.32 μ M KI and 4.44 μ M bAP) 2.85 μ M IAA,10%CM and 1 483.79 μM adenine sulfate.A single young leaf explant was capable of producing 59 shoots after 13 days of culture. Flower was induced in medium supplemented with combination of KI and ***: Cytokinins are the key factor to induce the direct shoot regeneration and flowering of ***.

关键词： Ethnomedicinal herb Scoparia dulcis Shoot induction Regeneration Cytokinin Micropropagation Explant Flowering Auxin Survival percentage bud induction

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The Log-Concavity of Kazhdan-Lusztig Polynomials of Uniform Matroids

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Journal of Systems Science & Complexity 2023年第1期36卷 117-128页

作者： XIE Matthew h Y ZhANG Philip b College of Science Tianjin University of TechnologyTianjin 300384China College of Mathematical Science Tianjin Normal UniversityTianjin 300387China

Elias,et al.(2016)conjectured that the Kazhdan-Lusztig polynomial of any matroid is *** by a computer proof of Moll’s log-concavity conjecture given by Kauers and Paule,the authors use a computer algebra system to pr... 详细信息

关键词： holonomicFunctions Kazhdan-Lusztig polynomial log-concavity uniform matroid

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Earth return path impedances of underground cable for three-layer earth

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第8期10卷 1191-1198页

作者： b.hEMMATIAN b.VAhIDI S.h.hOSSEINIAN Department of Electrical Engineering Amirkabir University of Technology

One of the factors that affect the parameters of an underground cable is earth return path *** developed a formula for the case of one-layer(homogenous) *** in practice the earth is composed of several *** this study we develop a new formula for earth return path impedance in the case of a three-layer *** check the accuracy of the obtained results,a comparison has been made with the finite element method(FEM).A comparison between the results of the Pollaczek formula and results of the obtained formula for a three-layer earth has been made,showing that the use of the Pollaczek formula instead of the actual formula can cause serious errors.

关键词： Underground cables Earth return path impedance Earth stratification Finite element method (FEM)

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SYNThESIS, ChARACTERIZATION AND SPECTROSCOPIC INVESTIGATION OF PYRAZINOPORPhYRAZINE NETWORK POLYMER-SUPPORTED METAL (Ⅱ)-bASED CATALYSTS

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Chinese Journal of Polymer Science 2013年第2期31卷 242-250页

作者： h.h. Abdel-Razik b.h. Asghar E. Kenawy Chemistry Department Faculty of Science Mansoura University Chemistry Department Faculty of Science Taif University Chemistry Department Faculty of Applied Sciences Umm Al-Qura University Chemistry Department Polymer Research Group Faculty of Science Tanta University

Chloranil through condensation reaction with vicinal diamine such as diaminomaleonitrile produced heterocyclic monomer, p-benzoquinonebis[2,3-b; 2＇,3＇-b＇]pyrazine-5,6-dinitrile. The tetranitrile monomer was cyclo-tetramerised using lithium/pentanol and acetic acid affording the corresponding tetrap-benzoquinone bis[2,3-b; 2＇,3＇-b＇]pyrazinoporphyrazine）]- based network polymer （2h-Pz）. The tetranitril monomer was cyclo-tetramerised using metal salt and quinoline affording the corresponding porphyrazinato-metal II-based network polymers （M-Pz）, M = Co, Ni or Cu. Elemental analytical results, IR and NMR spectral data of the prepared molecules are consistent with their assigned formulations. Molecular masses and metal contents of the synthesized polymers proved to be of high molecular masses which confirm the efficiency of tetramerization polymerization and complexation reactions. The prepared pyrazinoporphyrazines were used as efficient catalysts for the oxidation of thiophenol and benzylthiol to their disulfides in the presence of air atmosphere. The results of oxidation of thiophenol and benzylthiol show that after 15 min the maximum yield of the corresponding disulfides reached 95%, 91%, respectively.

关键词： Pyrazinoporphyrazine Polymer-supported metal (II)-based catalysts Chloranil.

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Stagnant lids and mantle overturns:Implications for Archaean tectonics, magmagenesis,crustal growth, mantle evolution, and the start of plate tectonics

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Geoscience Frontiers 2018年第1期9卷 19-49页

作者： Jean h.bédard Geological Survey of Canada GSC-Québec

The lower plate is the dominant agent in modern convergent margins characterized by active subduction,as negatively buoyant oceanic lithosphere sinks into the asthenosphere under its own *** is a strong plate-driving force because the slab-pull force is transmitted through the stiff sub-oceanic lithospheric *** geological and geochemical data seem inconsistent with the existence of modernstyle ridges and arcs in the Archaean,a periodically-destabilized stagnant-lid crust system is proposed ***-lid intervals may correspond to periods of layered mantle convection where efficient cooling was restricted to the upper mantle,perturbing Earth's heat generation/loss balance,eventually triggering mantle *** basalts were derived from fertile mantle in overturn upwelling zones(OUZOs),which were larger and longer-lived than post-Archaean *** cratons/continents probably formed above OUZOs as large volumes of basalt and komatiite were delivered for protracted periods,allowing basal crustal cannibalism,garnetiferous crustal restite delamination,and coupled development of continental crust and sub-continental lithospheric *** mixing and rehomogenization during overturns retarded development of isotopically depleted MORb(mid-ocean ridge basalt)*** after the start of true subduction did sequestration of subducted slabs at the coremantle boundary lead to the development of the depleted MORb mantle *** Archaean mantle overturns,pre-existing continents located above OUZOs would be strongly reworked;whereas OUZOdistal continents would drift in response to mantle *** leading edge of drifting Archaean continents would be convergent margins characterized by terrane accretion,imbrication,subcretion and anatexis of unsubductable oceanic *** Earth cooled and the background oceanic lithosphere became denser and stiffer,there would be an increasing probability that oceanic crustal segments could

关键词： Archaean Mantle-overturn Stagnant-lid Continental crust Oceanic crust Subcretion

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