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Potential application of graphene oxide and Aspergillus niger spores with high adsorption capacity for recovery of europium from red phosphor,compact fluorescent lamp and simulated radioactive waste

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Journal of Rare Earths 2023年第1期41卷 157-166页

作者： b.Arunraj Vidya rajesh N.rajesh Department of Chemistry Birla Institute of Technology and Science-PilaniHyderabad CampusShameerpetHyderabad 500078India Department of biological Sciences Birla Insttute of Technology and Science-PilaniHyderabad CampusShameerpetHyderabad 500078India

The recovery of rare earth elements(REEs) is a global challenge and the mining of rare earths has serious environmental implications due to the toxic waste released post ***,the rising demand for rare earths and their far reaching electronic applications necessitates an effective strategy to recover the REEs from more viable *** this work,the graphene oxide-Aspergillus niger spores(*** spores) blend was utilized for adsorptive recovery of a precious rare earth Eu(Ⅲ) and the adsorption variables like pH of the medium,adsorbent dosage,sorption kinetics,thermodynamics,and isotherm were optimized for the developed bioso *** adsorption process suits the Langmuir isotherm model with a maximum adsorption capacity of 147.3 mg/*** pseudo-second-order kinetics is a perfect fit to describe the adsorption *** results obtained through the Van’t Hoff plot show negative free energy change(ΔG^(0)) which implies the spontaneity of the adsorption *** negative standard enthalpy change(ΔH^(0)) values show that the nature of the adsorption process is *** analytical characterizations including Fourier transform infrared spectroscopy(FTIR),Raman,X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),brunauer-Emmett-Teller(bET),thermal gravimetric analysis(TGA),and scanning electron microscopy-energy dispersive X-ray spectroscopy(SEM-EDX) were employed to study the *** features of *** spores biosorbent were applied to recover Eu(Ⅲ) from real samples such as fluorescent lamp phosphor,red phosphor powder,and a simulated radioactive waste solution.

关键词： Europium Graphene oxide Aspergillus niger Phosphor Radioactive waste Rare earths

Generation of sub-wavelength and super-resolution longitudinally polarized non-diffraction beam using lens axicon

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Chinese Optics Letters 2008年第10期6卷 785-787页

作者： K.b.rajesh P.M.Anbarasan Department of Physics Periyar UniversitySalem 636011India

It is well known that a light spot of sub-wavelength will diverge in all directions. In this letter, A method is presented for generating sub-wavelength （0.44λ） longitudinally polarized beam, which propagates without divergence over lengths of about 2λ in free space. This is achieved by a high numerical aperture （NA） lens axicon that utilizes spherical aberration to duplicate the performance of an axicon and to create an extended focal line.

关键词： Azimuthally polarized beams Fresnel zones High numerical aperture optics Laser beams Optical data storage Superresolution

Numerical simulation of vegetated mine dump slope with reference to small plants

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International Journal of Mining Science and Technology 2014年第1期24卷 111-115页

作者： Rai rajesh Shrivastva b.K. Department of Mining Engineering Indian Institute of Technology (Banaras Hindu University)

The present paper discusses the effects of small plants on the dump mass reinforcement and slope *** roots of smaller plants(such as grasses and shrubs)do not go ***,they stabilize the slope by binding the upper layer of dump *** strength of the dump mass with and without root reinforcement is determined by laboratory shear box *** increased cohesion(apparent cohesion)of upper layer of the dump mass due to plants is determined by fabricated shear *** kinetic behavior of the dump has been investigated using the FLAC *** factor of safety has been calculated in order to determine the possible effect of small plants on the stability of the dump *** is observed that the small plants do not significantly improve the factor of safety(FOS)of ***,it could be useful for early *** grasses quickly bind the upper surface,whereas shrubs too immensely strengthen the stability of the dump in the initial stage.

关键词： Mine waste dumpSlope stability Vegetation Small plants Numerical modeling

Energy-aware VM migration using dragonfly–crow optimization and support vector regression model in Cloud

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International Journal of Modeling, Simulation, and Scientific Computing 2018年第6期9卷 19-42页

作者： Nitin S.More rajesh b.Ingle Department of Computer Engineering Pune Institute of Computer Technology(PICT)SPPU Pune 411043MaharashtraIndia

Nowadays,virtual machine migration(VMM)is a trending research since it helps in balancing the load of the Cloud *** VMM-based strategies defined in the literature have considered various metrics,such as load,energy,and migration cost for balancing the load of the *** paper introduces a novel VMM strategy by considering the load of the Cloud *** important aspects of the proposed scheme are the load prediction through the support vector regression(SVR)and the optimal VM placement through the proposed dragonfly-based crow(D-Crow)optimization *** proposed D-Crow optimization algorithm is developed by incorporating crow search algorithm(CSA)into dragonfly algorithm(DA).Also,the proposed VMM strategy defines a load balancing model based on the energy consumption,load,and the migration cost to achieve the energy-aware *** simulation of the proposed VMM strategy is done based on the metrics such as load,energy consumption,and the migration *** the results,it can be shown that the proposed VMM strategy surpassed other comparative models by achieving the minimum values of 7.3719%,10.0368%,and 11.0639%for the load,energy consumption,and migration cost,respectively.

关键词： Virtual machine migration load balancing load prediction optimal VM placement energy awareness.

ηmesons in hot magnetized nuclear matter

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Chinese Physics C 2022年第2期46卷 160-177页

作者： rajesh Kumar Arvind Kumar Department of Physics Dr.B R Ambedkar National Institute of Technology JalandharJalandhar-144011PunjabIndia

ηN interactions are investigated in hot magnetized asymmetric nuclear matter using the chiral SU(3)model and chiral perturbation theory(ChPT).In the chiral modcl,thc in-medium properties of η-mesons are calcu-lated using medium modified scalar densities under the influence of an extermal magnetic ***,in a com-bined chiral model and ChPT approach,off-shell contributions of the ηN interactions are evaluated from the ChPTeffective ηN Lagrangian,and the in-medium effect of scalar densities are incorporated from the chiral SU(3)*** find that the magnetic field has a significant effect on the in-medium mass and optical potential of η mesons,andwe observe a deeper mass-shift in the combined chiral model and ChPT approach than in the solo chiral SU(3)*** both approaches,no additional mass-shift is observed due to the uncharged nature of η mesons in the presenceof a magnetic field.

关键词： hadron physics ηinteractions in-medium mesons

Efficient design of perovskite solar cell using mixed halide and copper oxide

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Chinese Physics b 2018年第1期27卷 607-613页

作者： Navneet kour rajesh Mehra Chandni Department of Electronics and Communication Engineering NITTTR

Solar cells based on perovskites have emerged as a transpiring technology in the field of photovoltaic. These cells exhibit high power conversion efficiency. The perovskite material is observed to have good absorption in the entire visible spectrum which can be well illustrated by the quantum efficiency curve. In this paper, theoretical analysis has been done through device simulation for designing solar cell based on mixed halide perovskite. Various parameters have efficacy on the solar cell efficiency such as defect density, layer thickness, doping concentration, band offsets, etc. The use of copper oxide as the hole transport material has been analyzed. The analysis divulges that due to its mobility of charge carriers, it can be used as an alternative to spiro-OMeTAD. With the help of simulations, reasonable materials have been employed for the optimal design of solar cell based on perovskite material. With the integration of copper oxide into the solar cell structure, the results obtained are competent enough. The simulations have shown that with the use of copper oxide as hole transport material with mixed halide perovskite as absorber, the power conversion efficiency has improved by 6%. The open circuit voltage has shown an increase of 0.09 V, short circuit current density has increased by 2.32 mA/cm2, and improvement in fill factor is 8.75%.

关键词： perovskite solar cell band offset device simulation hole transport material

brown marine algae turbinaria conoides as biosorbent for Malachite green removal:Equilibrium and kinetic modeling

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Frontiers of Environmental Science & Engineering 2010年第1期4卷 116-122页

作者： R.rajesh KANNAN M.RAJASIMMAN N.RAJAMOHAN b.SIVAPRAKASH Environmental Engineering Laboratory Department of Chemical EngineeringAnnamalai UniversityAnnamalai Nagar-608002Tamil NaduIndia

In this study,the biosorption of Malachite green(MG)onto Turbinaria conoides,brown marine algae,was studied with respect to initial pH,temperature,initial dye concentration,and sorbent *** optimum initial pH and temperature values for MG removal were found to be 8.0 and 30℃,*** dosage was found to strongly influence the removal of *** studies were carried out to test the validity of the Langmuir(q_(max)=66.6 mg/g and b=0.526 mL mol/L)and the Freundlich(n=1.826 and K=3.751 mg/g)*** kinetic studies indicated the validity of the pseudo first-order and second-order equation.

关键词： Malachite green(MG) Turbinaria conoides marine algae equilibrium studies biosorption

Kinematic Modeling for biped Robot Gait Trajectory Using Machine Learning Techniques

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Journal of bionic Engineering 2022年第2期19卷 355-369页

作者： bharat Singh Ankit Vijayvargiya rajesh Kumar Department of Electrical Engineering Malaviya National Institute of TechnologyJaipur 302017India

This paper presents the predictive models for biped robot trajectory *** models are parametrizing as a continuous function of joint angle *** a previous work,the authors had collected the human locomotion dataset at RAMAN Lab,MNIT,Jaipur,*** MNIT gait dataset consists of walking data on a plane surface of 120 human subjects from different age groups and ***-two machine learning models(linear,support vector,k-nearest neighbor,ensemble,probabilistic,and deep learning)trained using the collected *** addition,two types of mapping,(a)one-to-one and(b)many-to-one,are presented for each *** mapping models act as a reference policy for the control of joints and prediction of state for the next time instant in advance if the onboard sensor *** show that the deep learning and probabilistic learning models perform better for both types of ***,the probabilistic model outperforms the deep learning-based models in terms of maximum error,because the probabilistic model effectively deals with the prediction *** addition,many-to-one outperforms the one-to-one mapping because it captures the correlation between knee,hip,and ankle ***,this study suggests a many-to-one mapping using the probabilistic model for biped robot trajectory generation.

关键词： Kinematic Locomotion Machine learning Prediction Regression

Charmonia and bottomonia in asymmetric magnetized hot nuclear matter

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Chinese Physics C 2019年第12期43卷 141-158页

作者： rajesh Kumar Arvind Kumar Department of Physics Dr.B R Ambedkar National Institute of Technology Jalandhar

We investigate the mass-shift of P-wave charmonium(χc0,χc1),and S and P-wave bottomonium(ηb,■,χb0,andχb1)states in magnetized hot asymmetric nuclear matter using the unification of QCD sum rules(QCDSR)and the chiral S U(3)*** QCDSR,we use two approaches,i.e.,the moment sum rule and the borel sum *** magnetic field induced scalar gluon condensateand the twist-2 gluon operatorcalculated in the chiral S U(3)model are utilised in QCD sum rules to calculate the in-medium mass-shift of the above *** attractive mass-shift of these mesons is observed,which is more sensitive to magnetic field in the high density regime for charmonium,however less so for *** results may be helpful to understand the decay of higher quarkonium states to the lower quarkonium states in asymmetric heavy ion collision experiments.

关键词： heavy mesons hot and dense matter finite magnetic field QCD sum rules chiral model