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Performance Improvement of Kenaf/Glass Polymer Hybrid Composites by Effective Application of Fish Scale Powder as Filler:A Novel Approach

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Journal of Harbin Institute of Technology(New Series) 2024年第3期31卷 80-96页

作者： Chandrakanta Mishra deepak kumar mohapatra Chitta Ranjan Deo Chetana Tripathy Kiran kumar Ekka Department of Mechanical Engineering Veer Surendra Sai University of TechnologySambalpur 768018OdishaIndia

Modern technology for developing new items made from renewable resources is becoming more and more popular as a result of rising environmental ***,contemporary polymer composites have included the hybridization of natural fibers with synthetic ones,along with the inclusion of a variety of biowaste filler for developing sustainable *** this work,the kenaf/glass hybrid polyester composites are strengthened by the addition of fish scale(FS),which is taken from the fish􀆳s outermost layer of *** different stacked-order laminates,such as KKKK,KGKG,GKKG,KGGK,and GGGG,are fabricated by using the hand lay-up method with four different weight concentrations of filler content:0%,5%,10%,and 15%.Mechanical possessions such as tensile,flexural,impact strength and micro-hardness have been evaluated through experimentation in accordance with ASTM *** experimental findings revealed that,the tensile strength and micro-hardness value of KGKG laminates with 15wt% of FS filler are found to be maximum of 118.72 MPa and 17.82 HV respectively which are 39.67%and 26.11%greater than that of KGKG laminates without FS ***,the flexural and impact strength of same laminates with 10 wt% FS filler exhibited a maximum value of 142.77 MPa and 62.08 kJ/m^(2).In order to corroborate its applicability for structural and building materials in open environment,the dimensional stability of the composite has been studied through moisture absorption *** influences of FS filler loading on dimensional stability and resistance to moisture absorption capacity of laminates are also *** experimental results reflected that the addition of FS-filler has significantly improved the dimensional stability of the laminates in moist environment by reducing the moisture absorption *** further support the mode of failures,a fractography investigation of fractured surfaces was conducted.

关键词： fish scale fiber polyester hybrid composites mechanical properties

Erosion Wear Behaviour of Kenaf/Glass Hybrid Polymer Composites

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Journal of Harbin Institute of Technology(New Series) 2024年第1期31卷 78-89页

作者： Chandrakanta Mishra deepak kumar mohapatra Chitta Ranjan Deo Punyapriya Mishra Kiran kumar Ekka Department of Mechanical Engineering Veer Surendra Sai University of TechnologySambalpur 768018India

The awareness amongst the researchers to develop an environment friendly sustainable material leads to explore new class of plant-based fiber for making composites. Hybridization of such plant-based fiber with inclusion of engineered fiber is one of the promising methods to not only enhanced the mechanical performance but also suppressed the drawbacks that associate with such plant-based fiber to some extent. A usual hand lay-up method was taken-up in this work to fabricate four layered of hybrid kenaf(K)/glass(G)polyester laminates with different stacking order such as KKKK,KGKG,KGGK,GKKG and GGGG. The erosive character of the laminates was examined under three distinct particle velocities(48m/s, 70m/s,82m/s)and four different impact angles(30°, 45°, 60°, 90°). All fabricated laminates exhibited a semiductile character at lower velocities(48m/s and70m/s)as peak wear rate was observed at45° impact angle. However,they showed a semi-brittle character at high velocity(82m/s)as maximum rate of erosion was noticed at60° impact angle. Again,the influence of stacking order of piles on erosion wear was also clearly noticed. Moreover,the semi-brittle/semi-ductile characterization was also evidenced in accordance to the range of erosion efficiencies. The micro-structures of worn surfaces were inspected thoroughly from the images of scanning electron microscope(SEM)to evident the mechanism of erosion.

关键词： hybrid composites erosion wear void micro⁃hardness

Evaluation of Dielectric Properties of CCTO-BT/Epoxy Composites for Electronic Applications

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Journal of Harbin Institute of Technology(New Series) 2024年第1期31卷 69-77页

作者： Swagatika Mishra Punyapriya Mishra Punyatoya Mishra Dinesh kumar Mishra Krushna Prasad Shadangi deepak kumar mohapatra Department of Mechanical Engineering Veer Surendra Sai University of TechnologyBurlaOdisha 768018India Department of Physics Parala Maharaja Engineering CollegeBerhampurOdisha 761003India Department of Metallurgical and Materials Engineering Veer Surendra Sai University of TechnologyBurlaOdisha768018India Department of Chemical Engineering Veer Surendra Sai University of TechnologyBurlaOdisha 768018India

In the current study,the calcium copper titanate(CCTO)/epoxy,barium titanate(BT)/epoxy and CCTO-BT/epoxy composite samples with variable volume fractions of CCTO and BT are fabricated using hand lay-up and compression moulding process. The composite samples are characterized for the frequency dependence on dielectric properties,conductivity,impedance spectroscopy and electrical modulus.X-ray diffraction(XRD)representation of CCTO-BT/epoxy composite samples confirmed the presence of both CCTO and BT ceramic samples separately. The dielectric characteristics of hybrid CCTO-BT/epoxy composite samples with CCTO∶BT ratio of 40∶60, 60∶40,and 50∶50 was found relatively better than those of single ceramic filler reinforced epoxy composites. AC conductivity analysis shows improvement in the results of hybrid filler-filled CCTO-BT/epoxy composites in comparison with single filler-filled epoxy composite.50∶50 CCTO-BT/epoxy composite shows the best AC conductivity value of~ 2.2 ×10^(-5) ohm^(-1)·m^(-1) at a higher frequency of 1MHz. The impedance analysis confirms the higher insulating properties for hybrid 40∶60 and 60∶40 CCTO-BT/epoxy composites with respect to the single and other hybrid ceramic epoxy composites. The analysis suggests the hybrid CCTO-BT/epoxy composites to be adopted as a potential dielectric material for energy storage devices and other electronic applications.

关键词： ceramic filler dielectric characterization hybrid Composite AC conductivity impedance analysis

Performance evaluation of cement-stabilized pond ash-rice husk ashclay mixture as a highway construction material

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Journal of Rock Mechanics and Geotechnical Engineering 2017年第1期9卷 159-169页

作者： deepak Gupta Arvind kumar Department of Civil Engineering National Institute of Technology (NIT) Jalandhar India

This paper reports the results of an investigation carried out on clay soil stabilized with pond ash(PA),rice husk ash(RHA) and cement. Modified Proctor compaction tests were performed in order to investigate the compaction behavior of clay, and California bearing ratio(CBR) tests were performed to determine the strength characteristics of clay. For evaluation purpose, the specimens containing different amounts of admixtures were prepared. Clay was replaced with PA and RHA at a dosage of 30%e45% and5%e20%, respectively. The influence of stabilizer types and dosages on mechanical properties of clay was evaluated. In order to study the surface morphology and crystallization characteristics of the soil samples, scanning electron microscopy(SEM) and X-ray diffraction(XRD) analyses were carried out,respectively. The results obtained indicated a decrease in the maximum dry density(MDD) and a simultaneous increase in the optimum moisture content(OMC) with the addition of PA and *** linear regression analysis(MLRA) showed that the predicted values of CBR tests are in good agreement with the experimental values. Developed stabilized soil mixtures showed satisfactory strength and can be used for construction of embankments and stabilization of sub-grade soil. The use of locally available soils, PA, RHA, and cement in the production of stabilized soils for such applications can provide sustainability for the local construction industry.

关键词： California bearing ratio(CBR) Pond ash(PA) Rice husk ash(RHA) Optimum moisture content(OMC) Maximum dry density(MDD)

Static and Dynamic Analyses of Spliced Column

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Sound & Vibration 2021年第3期55卷 253-262页

作者： deepak kumar Singh Research Scholar Civil Engineering DepartmentMNNIT AllahabadPrayagraj211004India

The analysis of spliced column has been carried out to detect optimum location of providing splices in the *** the present work,static and dynamic(free vibration)analyses of spliced column have been done by randomising the location of splicing.A symmetrical four storey steel framed building has been modelled,analysed and designed for loads(dead,live and earthquake loads)recommended by Indian Codal provisions using *** critical column at each floor level is identified based on axial force(AF),bending moment(BM)and shear force(SF).The total 16 models of spliced columns have been designed and then modelled in a 3D CAD Design tool(SOLIDWORKS)and then imported in the finite element tool(ANSYSWorkbench 14.0)for detailed *** variation of stress,strain and deflection of the spliced column are shown in the form of ***,the modal analysis is performed to determine the natural *** results of static and dynamic analyses are compared for each modelled spliced column to obtain the optimum location for providing splices in the *** dynamic analysis of spliced column is of utmost importance in the region where dynamic loadings like earthquake,cyclones *** more frequent,and mere static analysis does not account for the safety of the *** study will help the engineers to select directly the optimum size and location of the splices in the column of a steel framed building.

关键词： Column splice finite element method natural frequency modal analysis static analysis steel framed building

NMR relaxation and diffusion studies to probe the motional dynamics of risperidone within PLGA microsphere

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Magnetic Resonance Letters 2023年第2期3卷 197-205,I0005页

作者： deepak kumar Samanwita Pal Department of Chemistry Indian Institute of Technology JodhpurRajasthan342037.India Central Ayurveda Research Institute Kolkata CCRASBidhannagarKolkata700091India

The present study aims to investigate the motional dynamics of risperidone within polylactic co-glycolic acid(PLGA)microsphere by employing solution state'H and 19F nuclear magnetic resonance(NMR)***,a second-generation fluorinated antipsychotic drug used for the treatment of schizophrenia is commercially marketed as PLGA microsphere formulation resulting in prolonged release of the drug in *** the current trend in the pharmaceutical market is to develop drug formulation with long-acting release(LAR)products,complete physicochemical characterization of such formulations are *** the effects of microsphere encapsulation on the motional properties and diffusion behavior of the drugs are not discussed adequately in any of the earlier *** therefore,have employed NMR relaxation and diffusion measurements to decipher the interaction of PLGA cavity water with risperidone.A detailed analysis of NMR relaxation rates confirmed the event of encapsulation and the presence of local motion in the non-fluorinated end of ***,the relaxation data indicated a significant alteration in 19F chemical shift anisotropy(CSA)and CSA/dipole-dipole(DD)cross-correlated relaxation mechanism and decreased effect of solvent relaxation pointing out reduced water concentration within the microsphere cavity.'H and 19F diffusion coefficients of risperidone led to the information about hydrodynamic radius of risperidone in free and encapsulated *** of hydrodynamic radius supported the presence of limited water in PLGA cavity allowing higher translational mobility of risperidone after the encapsulation.

关键词： Polylactic co-glycolic acid(PLGA)microsphere Motional dynamics 1H and 19F NMR Diffusion Hydrodynamic radius Cross-correlated relaxation

Sustainability Assessment and Ranking of Run of the River(RoR) Hydropower Projects Using Analytical Hierarchy Process(AHP):A Study from Western Himalayan Region of India

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Journal of Mountain Science 2015年第5期12卷 1315-1333页

作者： deepak kumar Surjit Singh KATOCH Centre for Energy and Environmental Engineering National Institute of Technology

In the present scenario,tapping the unutilised hydropower potential is one of the highest priorities in developing countries of the *** emphasis is being imparted to run of the river(RoR)mode of power ***,the governments are now facing the dilemma whether to promote small hydropower projects(SHPs) or encourage large hydropower projects(LHPs).RoR large hydropower projects result into large scale cutting of mountains for constructing tunnels and access roads,generation of huge quantity of muck and large scale impact on flora and fauna due to diversion of rivers/*** the other hand,though SHPs are claimed to be greener and more sustainable by a section of researchers and energy planners but,they will be required to be set up in large number to generate equivalent amount of *** aim of this study is to rank the most sustainable installed capacity range of RoR hydropower *** achieve this aim,the study proposes the use of quite popular multi-criteria decision making(MCDM)method of Operation Research named Analytical Hierarchy Process.A case study has been presented from Himachal Pradesh,a hydro rich state located in the western Himalayan *** per sustainability assessment carried out in this study,hydropower projects in the capacity range 1 to 5 MW have been ranked to be the most sustainable.

关键词： Sustainability Run of the river Hydropower project Analytical Hierarchy Process Himalaya

Experimental investigation and optimization of weld bead characteristics during submerged arc welding of AISI 1023 steel

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Defence Technology（防务技术） 2019年第1期15卷 72-82页

作者： Ankush Choudhary Manoj kumar deepak Rajendra Unune Department of Mechanical-Mechatronics Engineering The LNM Institute of Information Technology

Submerged arc welding(SAW), owing to its high deposition rate and high welding quality, is widely used in the fabrication of pressure vessel, marine vessel, pipelines and offshore structures. However, selection of an optimum combination of welding parameters is critical in achieving high weld quality and productivity. In this work, initially, the SAW experiments were performed using fractional factorial design to analyze the effect of direct and indirect input parameters, namely, welding voltage, wire feed rate,welding speed, nozzle to plate distance, flux condition, and plate thickness on weld bead geometrical responses viz. bead width, reinforcement, and penetration. The bead on plate technique was used to deposit weld metal on AISI 1023 steel plates. The effect of SAW input parameters on response variables were analyzed using main and interaction effects. The linear regression was used to develop the mathematical models for the response variable. Then, the multi-objective optimization of input parameters was carried out using desirability approach, genetic algorithm and Jaya algorithm. The Jaya algorithm offered better optimization results as compared to desirability approach, genetic algorithm.

关键词： Submerged arc welding Optimization Regression Genetic algorithm Jaya algorithm

Current efficiency in electro-winning of lanthanum and cerium metals from molten chloride electrolytes

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Rare Metals 2013年第3期32卷 305-311页

作者： deepak kumar Sahoo Harvinderpal Singh Nagaiyar Krishnamurthy Rare Earths Development Section Bhabha Atomic Research Centre Fusion Reactor Materials Section Bhabha Atomic Research Centre

The objective of this study is to prepare lan- thanum and cerium metals by fused salt electrolysis of their anhydrous chloride in molten media such as LiCl-KCl, NaCl-KCl, KCl, NaCl, and LiCl and to characterize the metal deposit by X-ray diffraction, energy dispersive X-ray fluorescence, and inductive coupled plasma-atomic emis- sion spectroscopy. Deposit metal of purity more than 99 % was obtained in each of the experiments. The entire process starting from preparation of anhydrous lanthanum/cerium chloride to electrolysis yielding of metal deposits has been described. The effect of process parameters such as tem- perature, electrolyte composition, and current density on the current efficiency was studied. All these parameters were varied to get the highest current efficiency and metal yield. The major non-rare earth impurities with the deposit are found to be Fe, Cr, and Ni along with - 1× 10^-3 of total gaseous impurities.

关键词： Fused salt electrolysis Current density Current efficiency Rare earths