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Optimizing Biodiesel Production from Karanja and Algae Oil with Nano Catalyst:RSMand ANN Approach

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Energy Engineering 2024年第9期121卷 2363-2388页

作者： Sujeet Kesharvani Sakhi Katre Suyasha Pandey Gaurav dwivedi Tikendra Nath Verma Prashant Baredar Energy Centre Maulana Azad National Institute of TechnologyBhopal462003India Department of Mechanical Engineering Maulana Azad National Institute of TechnologyBhopal462003India

This study delves into biodiesel synthesis from non-edible oils and algae oil sources using Response Surface Methodology(RSM)and an Artificial Neural Network(ANN)model to optimize biodiesel *** of *** and Karanja oils is utilized,aiming to reduce free fatty acid content to 1%through single-step *** reveals peak biodiesel yield conditions:1%catalyst quantity,91.47 min reaction time,56.86℃reaction temperature,and 8.46:1 methanol to oil molar *** ANN model outperforms RSM in yield prediction *** impact assessment yields an E-factor of 0.0251 at maximum yield,indicating responsible production with minimal *** analysis reveals significant cost savings:30%-50%reduction in raw material costs by using non-edible oils,10%-15%increase in production efficiency,20%reduction in catalyst costs,and 15%-20%savings in energy *** optimized process reduces waste disposal costs by 10%-15%,enhancing overall economic ***,the widespread adoption of biodiesel offers economic,environmental,and social benefits to a diverse range of stakeholders,including farmers,producers,consumers,governments,environmental organizations,and the transportation *** among these stakeholders is essential for realizing the full potential of biodiesel as a sustainable energy solution.

关键词： Non-edible oil algae RSM ANN optimization environmental factor

Salp Swarm Algorithm for Solving Optimal Power Flow Problem with Thyristor-Controlled Series Capacitor

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Journal of Electronic Science and Technology 2022年第2期20卷 111-119页

作者： Balasubbareddy Mallala Divyanshi dwivedi the Department of Electrical and Electronics Engineering Chaitanya Bharathi Institute of TechnologyHyderabad 500075 the Department of Electrical and Electronics Engineering Indian Institute of TechnologyHyderabad 502284

In this paper, a salp swarm algorithm(SSA) is proposed for solving the optimal power flow(OPF)problem of a power system with the incorporation of the thyristor-controlled series capacitor(TCSC). The proposed methodology is implemented for determining the optimal setting of control variables for the OPF problem, which includes the real power of generators buses, voltages of generator buses, reactive power injected by shunt compensators, and tap changing transformer ratios. The performance of the proposed approach is validated and tested on the standard IEEE-30 bus system and single-objective functions, including transmission line losses. The severity factor has been minimized and the result obtained is compared with the existing algorithms. Simulation results achieved with the proposed SSA approach demonstrate that it results in an effective and better solution for the OPF problem.

关键词： optimal Optimal power

Local and biglobal linear stability analysis of parallel shear flows

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Computer Modeling in Engineering & Sciences 2017年第2期113卷 219-237页

作者： Sanjay Mittal Anubhav dwivedi Department of Aerospace Engineering Indian Institute of Technology KanpurUP 208016India

Linear Stability Analysis(LSA)of parallel shear flows,via local and global approaches,is *** local analysis is carried out by solving the Orr-Sommerfeld(OS)equation using a spectral-collocation method based on Chebyshev polynomials.A stabilized finite element formulation is employed to carry out the global analysis using the linearized disturbance equations in primitive *** local and global analysis are *** per the Squires theorem,the two-dimensional disturbance has the largest growth ***,only two-dimensional disturbances are *** its very nature,the local analysis assumes the disturbance field to be spatially periodic in the streamwise *** global analysis permits a more general ***,to enable a comparison with the local analysis,periodic boundary conditions,at the inlet and exit of the domain,are imposed on the *** are carried out for the LSA of the Plane Poiseuille Flow(PPF).The relationship between the wavenumber,a,of the disturbance and the streamwise extent of the domain,L,in the global analysis is explored for Re=*** is found that a and L are related by L=2pn/a,where n is the number of cells of the instability along the streamwise direction within the domain length,*** procedure to interpret the results from the global analysis,for comparison with local analysis,is described.

关键词： Linear stability analysis local analysis plane Poiseuille flow Orr-Sommerfeld equation global analysis

Synthesis and enhanced photoluminescence properties of red emitting divalent ion(Ca^(2+))doped Eu:Y_(2)O_(3)nanophosphors for optoelectronic applications

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Journal of Rare Earths 2022年第8期40卷 1187-1198页

作者： Arpita dwivedi Monika Srivastava Ankur dwivedi Amit Srivastava Anurag Mishra S.K.Srivastava Department of Physics Institute of ScienceBanaras Hindu University(BHU)Varanasi221005India School of Materials Science and Technology Indian Institute of Technology(BHU)Varanasi221005India Department of Mining Engineering Indian Institute of Technology(BHU)Varanasi221005India Department of Physics TDPG College VBS Purvanchal UniversityJaunpur222001India

This work presents the synthesis of Y_(2)O_(3):Eu^(3+),χCa^(2+)(χ=0 mol%,1 mol%,3 mol%,5 mol%,7 mol%,9 mol%,11 mol%)nanophosphors with enhanced photoluminescence properties through a facile solution combustion method for optoelectronic,display,and lighting *** X-ray diffraction(XRD)patterns of the proposed nanophosphor reveal its structural properties and crystalline *** transmission electron microscope(TEM)results confirm the change in the shape of the particle and aggregation of particles after co-doping with Ca^(2+).Fourier transform infrared spectroscopy(FTIR)and Raman vibrations also confirm the presence of Y-O vibration and subsequently explain the crystalline nature,structural properties,and purity of the *** the synthesized nanophosphors samples emit intense red emission at 613 nm(~5D_(0)→~7 F_(2))under excitation with 235,394 and 466 nm wavelengths of Eu^(3+)*** photoluminescence(PL)emission spectra excited with 235 nm illustrate the highest emission peak with two other emission peaks excited with 466 and 394 nm that is 1.4 times higher than 466 nm and 1.9 times enhanced by 394 nm wavelength,*** emission intensity of Y_(2)O_(3):Eu^(3+),χCa^(2+)(5 mol%)is increased 8-fold as compared to Eu:Y_(2)O_(3).Doping with Ca^(2+)ions enhances the emission intensity of Eu:Y_(2)O_(3)nanopho sphors due to an increase in energy transfer in Ca^(2+)→Eu^(3+)through asymmetry in the crystal field and by introduction of radiative defect centers through oxygen vacancies in the yttria *** is also observed that the optical band gap and the lifetime of the~5D_(0)level of Eu^(3+)ions in Y_(2)O_(3):Eu^(3+),xCa^(2+)nanophosphor sample gets changed with a doping conce ntration of Ca^(2+)*** also reveals high thermal stability and quantum yield as estimating activation energy of 0.25 eV and 81%,***,CCT,and color purity values(>98%)show an improved red-emitting nanophosphor in the warm region of light,which m

关键词： Red emission Photoluminescence(PL) Y_(2)O_(3):Eu^(3+),xCa^(2+) Rare earths Nanophosphors LEDs

Computer aided design and analysis of a tunable muzzle brake

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Defence Technology（防务技术） 2019年第1期15卷 89-94页

作者： Ekansh Chaturvedi Ravi K.dwivedi Department of Mechanical Engineering Maulana Azad National Institute of Technology

This research work deals with the design of a tunable muzzle brake [10] for a rifle chambered in 5.56 x 45 NATO ammunition. It proposes to solve the problem of handling differences from shooter to shooter by incorporating the feature of tunability. Beside this, it also solves the problem of requirement of optimum recoil in short recoil weapons. This innovation gives this design an edge over its already existing counterparts in the market. The product is designed using the internal ballistics calculations and the investigations been performed using solidworks flow simulation tool and ANSYS static structural to check the parameters like velocity distribution, pressure growth, and muzzle brake force along the series of ports and comparison of the so found results with those devised by the authors of the documents mentioned in references. This assures the market adaptability of the product for satisfactory performance, when brought among its already existing counterpart, though with a slight edge over them due to tunability. The results so found shall be concluded satisfactory regarding the performance of muzzle brake.

关键词： Flow simulation Innovation Muzzle brake Tunability Set screws

Modeling the Contemporary Stress Field and Deformation Pattern of Eastern Mediterranean

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Journal of Earth Science 2010年第4期21卷 365-381页

作者： S K dwivedi D Hayashi Simulation Tectonics Laboratory Faculty of ScienceUniversity of the Ryukyus

The contemporary stress field in the earth＇s crust is important and provides insights into mechanisms that drive plate motions. In this study, elastic plane stress finite element modeling incorporating realistic rock parameters was used to calculate the stress field, displacement field, and defor- mation of the plate interactions in the eastern Mediterranean. Modeled stress data for the African- Arabian-Anatolian plate interactions with fixed European platform correlate well with observed contemporary stress indicator from the world stress map （WSM） and focal mechanism of earthquakes; while displacement field agrees qualitatively well with GPS vectors and sense of motion indicated by focal mechanisms for large crustal earthquakes （Ms〉6） and plate motion models. Modeling result shows the direction of maximum horizontal compressive stress （σHmax） toward the direction of absolute motion of these plates. Large perturbations in σHmax orientations are shown to occur in and around tectonic boundaries between those plates. It is observed that, although the African plate acts mostly as indenter, which transmits the collisional motion from the Arabian plate to the Anatolian plate, in the current situation, the far-field stress, probably from the subduction in Aegean Arc, is needed to satisfy the contemporary stress field in Anatolia.

关键词： finite element model maximum horizontal stress seismieity crustal deformation Anatolia eastern Mediterranean.

Blockchain-Based Secured IPFS-Enable Event Storage Technique With Authentication Protocol in VANET

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IEEE/CAA Journal of Automatica Sinica 2021年第12期8卷 1913-1922页

作者： Sanjeev Kumar dwivedi Ruhul Amin Satyanarayana Vollala Department of CSE Dr.Shyama Prasad Mukherjee International Institute of Information Technology Naya RaipurChhattisgarh 492002India

In recent decades,intelligent transportation systems(ITS)have improved drivers’safety and have shared information(such as traffic congestion and accidents)in a very efficient ***,the privacy of vehicles and the security of event information is a major *** problem of secure sharing of event information without compromising the trusted third party(TTP)and data storage is the main issue in *** technologies can resolve this problem.A work has been published on blockchain-based protocol for secure sharing of events and authentication of *** protocol addresses the issue of the safe storing of event ***,authentication of vehicles solely depends on the cloud *** a result,their scheme utilizes the notion of partially decentralized *** paper proposes a novel decentralized architecture for the vehicular ad-hoc network(VANET)without the cloud *** work also presents a protocol for securing event information and vehicle authentication using the blockchain *** this protocol,the registered user accesses the event information securely from the interplanetary file system(IPFS).We incorporate the IPFS,along with blockchain,to store the information in a fully distributed *** proposed protocol is compared with the *** comparison provides desirable security at a reasonable *** evaluation of the proposed smart contract in terms of cost(GAS)is also discussed.

关键词： Authentication blockchain interplanetary file system(IPFS) secure information sharing security

A Cooperative Approach of Frequency Regulation Through Virtual Inertia Control and Enhancement of Low Voltage Ride-through in DFIG-based Wind Farm

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Journal of Modern Power Systems and Clean Energy 2022年第6期10卷 1519-1530页

作者： Preeti Verma Seethalekshmi K. Bharti dwivedi Department of Electrical Engineering Institute of Engineering and TechnologyLucknow 226021Uttar PradeshIndiawhich is a constituent institute of Dr.A.P.J.Abdul Kalam Technical UniversityLucknowUttar Pradesh(U.P.)India IEEE

Doubly-fed induction generator(DFIG)-based wind farms(WFs)are interfaced with power electronic *** interfaces are attributed to the low inertia generated in the WFs under high penetration and that becomes prevalent in a fault ***,transient stability enhancement along with frequency stability in DFIG-based WFs is a major concern in the present *** this paper,a cooperative approach consisting of virtual inertia control(VIC)and a modified grid-side converter(GSC)approach for low voltage ride-through(LVRT)is proposed to achieve fault ride-through(FRT)capabilities as per the grid code requirements(GCRs)while providing frequency support to the grid through a synthetic *** proposed approach provides LVRT and reactive power compensation in the *** participation of the VIC in a rotor-side converter(RSC)provides frequency support to the DFIG-based *** combined approach supports active power compensation and provides sufficient kinetic energy support to the system in a contingency *** studies are carried out in MATLAB/Simulink environment for symmetrical and unsymmetrical *** superiority of the proposed scheme is demonstrated through analysis of the performance of the scheme and that of a series resonance bridge-type fault current limiter(SR-BFCL).

关键词： Virtual inertia controller(VIC) doubly-fed induction generator(DFIG) fault ride-through(FRT)capability wind farm(WF) fault current limiter(FCL)

Role of intravenously administered hyoscine butyl bromide in retrograde terminal ileoscopy: A randomized, double-blinded, placebo-controlled trial

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World Journal of Gastroenterology 2007年第12期13卷 1820-1823页

作者： SP Misra M dwivedi Department of Gastroenterology MotiLal Nehru Medical College University of Allahabad Allahabad211001 India

AIM： To evaluated the role of hyoscine butyl bromide in facilitating retrograde ileoscopy. METHODS： Retrograde terminal ileoscopy was attempted in 200 consecutive patients undergoing colonoscopy. After intubation of the cecum and visualization of the ileocecal valve, butyl bromide injection or normal saline was given intravenously to the patients in a double blind random fashion. The pulse rate and oxygen saturation were measured continuously. After completion of the procedure, endoscopists were then asked to score the ease of intubation and the ease of visualization of the terminal ileum on a visual scale of 1 to 10. The patients were also asked to score the pain after receiving hyoscine butyl bromide injection on a score of 1 to 10. RESULTS： Terminal ileoscopy could be performed in 188 patients. The mean （SD） visual analogue score for the ease of intubation of the cecum was 7.4 （0.65） in the injection group and 5.9 （0.8） in the placebo group （P 〈 0.001）. The mean （SD） length of ileum visualized in the injection group was 14.4 （3.3） cm and 10.4 （2.7） cm in the placebo group （P 〈 0.001）. The mean （SD） visual analogue score for ease of visualization of the terminal ileum was 7.5 （0.69） in the injection group and 5.9 （0.7） in the placebo group （P 〈 0.001）. The pain score experienced by the patients was 6.5 （0.7） in the injection group and 6.7 （0.69） in the placebo group （P 〈 0.008）. Although the pulse rate increased significantly in patients receiving the drug, no statistically significant difference was noted in the oxygen saturation between the two groups either before or after administration of the drug. No complications were observed in either of the groups. CONCLUSION： Hyoscine butyl bromide injection is a useful adjunct in helping the intubation and visualization of terminal ileum during colonoscopy.

关键词： Ileoscopy Colonoscopy Colon Ileum Hyoscine Tuberculosis Inflammatory bowel disease Cancer