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Surface roughness measurements in NFMQL assisted turning of titanium alloys: An optimization approach

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Friction 2017年第2期5卷 155-170页

作者： Munish k.GUpTA p.k.SOOD MED NIT Hamirpur(H.P.)177005 India

The prediction and optimization of surface roughness values remain a critical concern in nano-fluids based minimum quantity lubrication (NFMQL) turning of titanium (grade-2) ***,we discuss an application of response surface methodology with Box-Cox transformation to determine the optimal cutting parameters for three surface roughness values,i.e.,Ra,Rq,and Rz,in turning of titanium alloy under the NFMQL *** surface roughness prediction model has been established based on the selected input parameters such as cutting speed,feed rate,approach angle,and different nano-fluids *** the multiple regression technique is used to find the relationship between the given responses and input ***,the experimental data were optimized through the desirability function *** findings from the current investigation showed that feed rate is the most effective parameter followed by cutting speed,different nano-fluids,and approach angle on Ra and Rq values,whereas cutting speed is more effective in the case of Rz under NFMQL ***,the predicted results are comparatively near to the experimental values and hence,the established models of RSM using Box-Cox transformation can be used for prediction satisfactorily.

关键词： nano-fluids optimization surface roughness turning titanium alloy

Generative Adversarial Network Based Approach towards Synthetically Generating Insider Threat Scenarios

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Journal of Software Engineering and Applications 2023年第11期16卷 586-604页

作者： Mayesh mohapatra Anshumaan phukan Vijay k. Madisetti Indian Institute of Science Bengaluru India Bennett University Greater Noida India School of Cybersecurity and privacy Georgia Institute of Technology Atlanta USA

This research paper explores the use of Generative Adversarial Networks (GANs) to synthetically generate insider threat scenarios. Insider threats pose significant risks to IT infrastructures, requiring effective detection and mitigation strategies. By training GAN models on historical insider threat data, synthetic scenarios resembling real-world incidents can be generated, including various tactics and procedures employed by insiders. The paper discusses the benefits, challenges, and ethical considerations associated with using GAN-generated data. The findings highlight the potential of GANs in enhancing insider threat detection and response capabilities, empowering organizations to fortify their defenses and proactively mitigate risks posed by internal actors.

关键词： GANs CERT Insider-Threat Cybersecurity

Short Term Wind Speed prediction Using Multiple kernel pseudo Inverse Neural Network

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International Journal of Automation and computing 2018年第1期15卷 66-83页

作者： S.p.Mishra p.k.Dash Multi-disciplinary Research Centre (MDRC) Department of Electrical EngineeringSiksha "O" Anusandhan University

An accurate short-term wind speed prediction algorithm based on the efficient kernel ridge pseudo inverse neural network （kRpINN） variants is proposed in this paper. The use of nonlinear kernel functions in pseudo inverse neural networks eliminates the trial and error approach of choosing the number of hidden layer neurons and their activation functions. The robustness of the proposed method has been validated in comparison with other models such as pseudo inverse radial basis function （pIRBF） and Legendre tanh activation function based neural network, i.e., pILNNT, whose input weights to the hidden layer weights are optimized using an adaptive firefly algorithm, i.e., FFA. However, since the individual kernel functions based kRpINN may not be able to produce accurate forecasts under chaotically varying wind speed conditions, a linear combination of individual kernel functions is used to build the multi kernel ridge pseudo inverse neural network （Mk-RpINN） for providing improved forecasting accuracy, generalization, and stability of the wind speed prediction model. Several case studies have been presented to validate the accuracy of the short-term wind speed prediction models using the real world wind speed data from a wind farm in the Wyoming State of USA over time horizons varying from 10 minutes to 5 hours.

关键词： Wind speed prediction pseudo inverse neural network kernel ridge regression nonlinear kernels firefly optimizatiotl.

On the Epochal Variability in the Frequency of Cyclones during the pre-Onset and Onset phases of the Monsoon over the North Indian Ocean

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Advances in Atmospheric Sciences 2020年第6期37卷 634-651页

作者： p.p.BABURAJ S.ABHILASH k.MOHANkUMAR A.k.SAHAI Department of Atmospheric Sciences Cochin University of Science and TechnologyCochin 682016India Regional Meteorological Center India Meteorological DepartmentChennai 600006India Advanced Center for Atmospheric Radar Research Cochin University of Science and TechnologyCochin 682022India Indian Institute of Tropical Meteorology Dr.Homi Bhabha RoadPashanPune 411008India

In this paper we examine the epochal changes in the frequency of cyclones over the North Indian Ocean during the pre-onset and onset phases of the *** consider three epochs;namely,the early(1955-74),middle(1975-94)and recent(1995-2014)*** is found that the number of cyclones in the Bay of Bengal(BOB)decreases throughout the three *** the Arabian Sea(ARB),however,there is a decrease in the early epoch,before then reaching a minimum in the middle epoch followed by an increase in the recent epoch,thus exhibiting epochal *** and thermodynamic parameters along with Genesis potential Index(GpI)are examined to understand the frequency variation in cyclogenesis over the ARB and *** the ARB,thermodynamic factors such as mid-level moisture,surface latent heat flux and sensible heat flux,and dynamic parameters such as lower-level convergence and upper-level divergence,are favorable during the early and recent epochs but unfavorable during the middle epoch,and these results are found to be consistent with the observed epochal variability in the frequency of ***,all these influential parameters are found to have decreased over the BOB during the entire 60-year period.

关键词： epoch Indian moisture

Learning Matter:Materials Design with Machine Learning andAtomistic Simulations

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Accounts of Materials Research 2022年第3期3卷 343-357页

作者： Simon Axelrod Daniel Schwalbe-koda Somesh mohapatra James Damewood kevin p.Greenman Rafael Gómez-Bombarelli Department of Chemistry and Chemical Biology Harvard UniversityCambridgeMassachusetts 02138United States Department of Materials Science and Engineering Massachusetts Institute of TechnologyCambridgeMassachusetts 02139United States

CONSpECTUS:Designing new materials is vital for addressing pressing societal challenges in health,energy,and *** combination of physicochemical laws and empirical trial and error has long guided material design,but this approach is limited by the cost of experiments and the difficulty of deriving complex guiding *** space of hypothetical materials to be considered is incredibly large,and only a small fraction of possible compounds can ever be tested *** computational techniques of atomistic simulation and machine learning(ML)offer an avenue to rapidly invent new materials and navigate this enormous ***,they can be used to infer complex design principles and identify high-quality candidates more rapidly than trial-and-error *** this Account,we review our group’s recent contributions to simulation and ML for materials *** begin by discussing the numerical representation of materials for use in *** can be produced through deterministic algorithms,learnable encodings,or physics-based methods and lead to vector,graph,and matrix *** describe how these different approaches offer distinct material-and application-specific *** provide demonstrations from our own work on small-molecule drugs,macromolecules,dyes,electrolytes,and *** several cases,we show how the appropriate representation led to guiding principles that facilitated experimental materials ***,we highlight the development of ML methods for enhancing atomistic *** advances help to improve simulation accuracy and expand the time and length scales that can be *** include differentiable atomistic simulations in which ensemble-averaged quantities are differentiated with respect to system parameters,and novel autoregressive methods for enhanced sampling of challenging physical *** developments include learnable coarse-grained models,which can accelerate molecula

关键词： zeolite differentiable latter

Deformation-based support design for highly stressed ground with a focus on rockburst damage mitigation

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第1期14卷 50-66页

作者： p.k.kaiser A.Moss Laurentian University SudburyONP3E 2C6Canada Geok Inc.680 Ramsey Lake Road SudburyONP3E 6H5Canada Sonal Mining Technology Inc. 2488 Shadbolt LaneWest VancouverBCV7S 3J1Canada

As mines go deeper,mine designs become more fragile and effective rock support becomes a strategic element for ground control to facilitate timely construction and cost-effective access for uninterrupted *** article focuses on the design of integrated support systems for brittle ground when large displacements due to gradual bulking of stress-fractured rock or sudden violent bulking during rockbursts are induced by static and dynamic *** provides an overview of support design principles for a rational approach to ground control in deep mines when large deformations are anticipated near *** designs must not only account for load equilibrium but also for deformation *** importantly,the design approach must account for the fact that the support’s displacement capacity is being consumed as it is deformed after support *** is therefore necessary to design for the remnant support capacity,*** capacity remaining when the support is ***,if the support capacity can be consumed,it can also be restored by means of preventive support maintenance(pSM).The pSM concept for cost-effective ground control is introduced and illustrated by quantitative and operational *** to other design approaches,the deformation-based support design(DBSD)approach provides the capacity of an integrated support system as a function of imposed *** in this support capacity due to mininginduced deformation renders excavations increasingly more vulnerable if located within the influence of active mining and seismic *** deformation measurements are robust indicators of the decay in support capacity,scanning and other displacement monitoring technologies enable measurements to verify the DBSD approach,to assess the remnant safety margin of the deformed support,and to make operational support maintenance decisions.

关键词： Deep mining Deformation-based support design(DBSD) Cost-effective support Support consumption preventive support maintenance(pSM)

Tribological and vibrational characteristics of AISI 316L tested at elevated temperature and 600 Torr vacuum

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Defence Technology（防务技术） 2019年第1期15卷 58-64页

作者： k.Arul Raj M.p.Arunkumar p.k.C.kanigalpula M.karthikeyan Department of Mechanical Engineering Koneru Lakshmaiah Education Foundation Department of Mechanical Engineering RajaRajeswari College of Engineering

Friction and wear studies enable the investigation of material interaction between two sliding surfaces in contact. In the present investigation, the coefficient of friction and the wear resistance of AISI 316 L parts were studied under self-mating, dry sliding conditions using a pin-on-disc type configuration. The experiments were conducted at vacuum based high temperature pin-on-disc tribometer. The 4 mm diameter pin and 180 mm diameter disc were subjected to varying sliding velocities(0.5, 0.75 and 1.5 m/s) and were operated in 200, 400, 500 and 580 ℃ temperature at 600 Torr vacuum. The variation of specific wear rates with sliding velocities and different environmental conditions was studied. The morphology of sliding/rubbed surfaces was observed using Scanning Electron Microscope. In summary, it was found that a severe to mild wear transition occurred in sliding under operating conditions. Increased wear rates have been observed for 500 and 580 ℃ with increasing sliding velocity. Adhesive wear has been found to be predominant at 500 and 580 ℃ where as de-lamination has been observed at ambient temperature,200 and 400 ℃ in vacuum. The present paper also carried out the numerical analysis of the vibration behavior of AISI 316 L under thermal environment. Results revealed that at high temperature vibrational amplitude and natural frequency is significantly reduced. This can be attributed to the reduction in stiffness of the material at elevated temperatures. This high amplitude vibration during service can lead to high wear rate.

关键词： pin-on-disc Sliding wear Vacuum De-lamination Scanning electron microscope Vibration

An operational approach to ground control in deep mines

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第1期14卷 67-81页

作者： A.Moss p.k.kaiser Sonal Mining Technology Inc. 2488 Shadbolt LaneWest VancouverBCV7S 3J1Canada Laurentian University SudburyONP3E 2C6Canada Geok Inc. 680 Ramsey Lake RoadSudburyONP3E 6H5Canada

As mines go deeper and get larger,mine designs become more fragile largely due to the response of the rock mass to *** control and rock support become important levers in the mine construction schedule,production performance,and excavation *** example,in cave mines,the production footprint together with associated mine infrastructure are significant investments in a modern caving *** investment must be protected and maintained to reduce the risk of ground-related production *** is necessary to preserve the health of these excavations and their maintenance through an effective rock support *** support thus becomes a strategic element in asset *** article focuses on support design for brittle ground when displacements induced by stress-fracturing consume much of the support’s *** deals with the functionality of the support in deforming *** interlinked concepts are important when assessing excavation *** must not only account for load equilibrium but also for deformation compatibility and capacity *** importantly,the support’s displacement capacity is being consumed when the rock mass is deformed after support ***,it is necessary to design for the support capacity remaining at the time when the support is *** support capacity can be consumed,it can also be restored by means of preventive support maintenance(pSM).This concept for cost-effective ground control is introduced and illustrated on operational ***,how design can impact construction costs and schedule are *** is installed to provide a safe environment and preserve an operationally functional *** also must assure senior management that investments in high quality support and its maintenance will substantially reduce delays and with it,*** is demonstrated that the use of‘gabion-like’support systems can achieve these goals.A technical summary of th

关键词： Ground control Rock support Deformation-based support design(DBSD) Gabion panel Deep mining Support consumption preventive support maintenance(pSM) Asset management

Differential Genotoxicity of the Crude Leaf Extract of a Medicinal plant, Casearia tomentosa

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Biomedical and Environmental Sciences 2000年第1期13卷 12-18页

作者： k.S.AWASTHY O.p.CHAURASIA S.p.SINHA p.k.kHAN Department of Zoology Bhagalpur UniversityBhagalpur 812007India

The genotoxic potentiality of the crude leaf extract of Casearia tomentosa, a medicinal preparation, has been evaluated in Swiss albino mice. The extract significantly induced the division_disruptive chromosomal changes in bone marrow cells as well as in primary spermatocytes; the latter also exhibited marked increase in synaptic disruptions. A significant decrease in sperm count was noted. The incidence of structural damages in chromosomes, however, remained within the range of control level frequency. This herbal preparation, therefore, appears to be primarily spindle_poisoning in its action, but not clastogenic. The probable mechanism of this differential genotoxicity is discussed.

关键词： Animals Bone Marrow Cells Male Mice Mitotic Spindle Apparatus Mutagenicity Tests plant Extracts plants, Medicinal Sperm Count Spermatocytes