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International Journal of Coal Science & Technology 2021年第6期8卷 1504-1514页

作者： Abyansh Roy Heena Dhawan Sreedevi Upadhyayula Hariprasad Kodamana Department of Chemical Engineering Indian Institute of Technology DelhiHauz KhasNew Delhi 110016India

The present work aims at studying five Indian coals and their solvent extracted clean coal products using Py-GCMS analysis and correlating the characterization data using theoretical principal component *** pyrolysis products of the original coals and the super clean coals were classified as mono-,di-and tri-aromatics,while other prominent products that were obtained included cycloalkanes,n-alkanes,and alkenes ranging from C_(10)-C_(29).The principal component analysis is a dimensionality reduction technique that reduced the number of input variables in the characterization dataset and gave inferences on the relative composition of constituent compounds and functional groups and structural insights based on scores and loading plots which were consistent with the experimental ***-FTIR studies confirmed the reduced concentration of ash in the super clean coals and the presence of *** Py-GCMS data and the ATR-FTIR spectra led to the conclusion that the super clean coals behaved similarly for both coking and noncoking coals with high aromatic concentrations as compared to the raw *** lignite super clean coal was found to show some structural similarity with the original coals,whereas the other super clean coals showed structural similarity within themselves but not with their original coal samples confirming the selective action of the e,N solvent in solubilizing the polycondensed aromatic structures in the coal samples.

关键词： Indian coal Super clean coals Pyrolysis PCA ATR-FTIR Py-GCMS

Modelling and analysis of COVID-19 epidemic in India

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Journal of Safety Science and Resilience 2020年第2期1卷 135-140页

作者： Alok Tiwari Department of Energy Science and Engineering IIT BombayMumbai 400076India

COVID-19 epidemic is declared as the public health emergency of international concern by the World Health Organisation in the last week of March *** disease originated from China in December 2019 has already caused havoc around the world,including *** first case in India was reported on 30th January 2020,with the cases crossing 4 million on the day paper was *** pandemic has caused more than 80,000 fatalities with 3 million *** lockdown of the nation for two months,immediate isolation of infected cases and app-based tracing of infected are some of the proactive steps taken by the *** a better understanding of the evolution of COVID-19 in the world,study on evolution and growth of cases in India could not be *** understand the same,one of the compartment model:Susceptible-Infectious-Quarantined-Recovered(SIQR)is *** rate and doubling rate of the total reported positive cases in the country had crossed 75%and 25 days,*** is also estimated that there is a strong positive correlation between testing rate and detection of new cases up to 6 million tests per *** the SIQR modelling effective reproduction number,epidemic doubling rate and infected to quarantined ratio is determined to check the temporal evolution of the pandemic in the *** reproduction number that was at its peak during first half of the April is gradually converging to *** is also estimated using this model that with each detected cases in India,there could be 10-50 undetected *** every mathematical model,this model also has some *** make this model more robust,a technique with weighted parameter that can avoid a person with a strong immune system to be equally vulnerable to the infection,can be worked *** learning algorithms can also be used to train our model with the data of other countries to make the analysis and prediction more precise and accurate.

关键词： Mathematical modelling SIQR COVID 19 Reproduction number India

Wave Interaction and Resonance in a Non-Ideal Gas

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Chinese Physics Letters 2012年第12期29卷 5-8页

作者： Rajan Arora Mohd.Junaid Siddiqui V.P.Singh Department of Applied Science and Engineering IIT RoorkeeSaharanpur CampusSaharanpurUP-247001India

The method of multiple time scales is used to obtain the asymptotic solutions to the planar and non-planar flows into a non-ideal *** transport equations for the amplitudes of resonantly interacting high frequency wav... 详细信息

关键词： resonant planar asymptotic

Keystroke Dynamics Based Authentication Using Possibilistic Renyi Entropy Features and Composite Fuzzy Classifier

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Journal of Modern Physics 2018年第2期9卷 112-129页

作者： Aparna Bhatia Madasu Hanmandlu Department of Electrical Engineering Indian Institute of Technology Delhi HauzKhas New Delhi India CSE Department MVSR Engg. College Nadergul Hyderabad Formally with EE Department IIT Delhi New Delhi

This paper presents the formulation of the possibilistic Renyi entropy function from the Renyi entropy function using the framework of Hanman-Anirban entropy function. The new entropy function is used to derive the information set features from keystroke dynamics for the authentication of users. A new composite fuzzy classifier is also proposed based on Mamta-Hanman entropy function and applied on the Information Set based features. A comparison of the results of the proposed approach with those of Support Vector Machine and Random Forest classifier shows that the new classifier outperforms the other two.

关键词： Keystroke Dynamics Information Set Renyi Entropy Function and Its Possibilistic Version Composite Fuzzy Classifier

Effect of Tool Shoulder and Pin Probe Profiles on Friction Stirred Aluminum Welds-a Comparative Study

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Journal of Marine Science and Application 2012年第2期11卷 200-207页

作者： H.K.Mohanty M.M.Mahapatra P.Kumar P.Biswas N.R.Mandal Mechanical & Industrial Engineering Department IIT Roorkee-247667 India. Department of Mechanical Engineering IIT Guwahati- 781039 India Department of Ocean Engineering & Naval Architecture IIT Kharagpur-721302 India.

在海洋的申请，海洋的等级钢通常被使用为拖并且上层建筑。然而，铝也由于它的小质量成为了一种好选择，当铝生锈与钢相比是最小的时。在磨擦上在这糊研究促使铝合金焊接被介绍。现在的调查处理不同磨擦的效果促使在机械强度和铝合金焊... 详细信息

在海洋的申请，海洋的等级钢通常被使用为拖并且上层建筑。然而，铝也由于它的小质量成为了一种好选择，当铝生锈与钢相比是最小的时。在磨擦上在这糊研究促使铝合金焊接被介绍。现在的调查处理不同磨擦的效果促使在机械强度和铝合金焊接的微观结构性质上焊接工具几何学。有肩膀和工具探查侧面的不同类型的三不同工具几何学根据设计矩阵在调查被使用。焊接上的每个工具肩膀和探查几何学的效果被评估。磨擦搅动焊接工具几何学，这也被观察在焊接加强， microhardness，和焊接强度上有重要效果。

关键词：搅拌摩擦焊铝钢焊缝工具探针几何形状焊接刀具上层建筑

FINITE ELEMENT ANALYSIS OF A VERTICAL RECTANGULAR PLATE COUPLED WITH AN UNBOUNDED FLUID DOMAIN ON ONE SIDE USING A TRUNCATED FAR BOUNDARY

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Journal of Hydrodynamics 2009年第2期21卷 190-200页

作者： PANI P. K. BHATTACHARYYA S. K. Civil Engineering Department IGIT Sarang Orissa 759146 India Civil Engineering Department IIT Kharagpur 721302 India

The dynamic pressure distribution on a rectangular plate attached to a rigid wall and supporting an infinitely large extent of fluid subjected to a harmonic ground excitation is evaluated in the time domain. Governing equations for the fluid domain are set considering the compressibility of the fluid with negligibly small change in density and a linearized free surface. A far boundary condition for the three-dimensional fluid domain is developed so that the far boundary is truncated at a closer proximity to the structure. The coupled problem is solved independently for the structure and the fluid domain by transferring the acceleration of the plate to the fluid and pressure of the fluid to the plate in sequence. Helmholtz equation for the three-dimensional fluid domain and Mindlin＇s theory for the two-dimensional plate are used for the solution of the interacting domains. Finite element technique is adopted for the solution of this problem with pressure as nodal variable for the fluid domain and displacement for the plate. The time dependent equations are solved in each of the interacting domain using Newmark-fl method. The effectiveness of the technique is demonstrated and the influences of surface wave, exciting frequency and flexibility of the plate on dynamic pressure are investigated.

关键词： fluid-structure interaction compressible fluid linear surface wave truncation boundary dynamic pressure

Production,activation,and applications of biochar in recent times

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Biochar 2020年第3期2卷 253-285页

作者： Anil Kumar Sakhiya Abhijeet Anand Priyanka Kaushal Center for Rural Development and Technology Indian Institute of Technology-DelhiNew Delhi 110016India

Biomass is a green energy source and is available in *** is a carbon-rich material derived from a wide range of biomass or organic waste through the thermochemical *** has received increasing attention because of its distinctive properties such as high carbon content,greater specific surface area,cation exchange capacity,nutrient retention capacity,and stable *** review paper extensively studies and reports the different pyrolysis processes,reactor types,the effect of process parameters on biochar yield,and its physicochemical properties,biochar activation methods,and *** also details the status of the research and development(R&D)progress in biochar production through conventional and advanced *** study found that unlike many products(at R&D stage)biochar has high potential to scale up and has a direct impact on crop yield,water purification(for domestic and industrial application),alternative fuels(clean solid fuel for cookstove),air purification,catalyst,biogas production,purification,and *** addition,the paper lists the merits and challenges in the novel biochar applications like hydrogen storage,electrochemical capacitor,and fuel cell technology.

关键词： Biomass Pyrolysis Biochar Application Review

Organo-Petrographic and Pore Facets of Permian Shale Beds of Jharia Basin with Implications to Shale Gas Reservoir

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Journal of Earth Science 2017年第5期28卷 897-916页

作者： Vinod Atmaram Mendhe Subhashree Mishra Ranjit G.Khangar Alka Damodhar Kamble Durgesh Kumar Atul Kumar Varma H.Singh Sujeet Kumar Mollika Bannerjee CSIR-Central Institute of Mining and Fuel Research GSI-Geological Survey of India Central Region iit (ISM)-Department of Chemical Engineering Indian Institute of Technology (ISM) iit (ISM)-Department of Applied Geology Indian Institute of Technology (ISM)

The shale deposits of Damodar Valley have received great attention since preliminary studies indicate their potential for shale gas. However, fundamental information allied to shale gas re- servoir characteristics are still rare in India, as exploration is in the primary stage. In this study, Ba- rakar shale beds of eastern part of Jharia Basin are evaluated for gas reservoir characteristics. It is evident that Barakar shales are carbonaceous, silty, contains sub-angular flecks of quartz and mica, irregular hair-line fractures and showing lithological variations along the bedding planes, signifying terrestrial-fluviatile deposits under reducing environment. The values of TOC varies from 1.21 wt.% to 17.32 wt.%, indicating good source rock potentiality. The vitrinite, liptinite, inertinite and mineral matter ranging from 0.28 vol.% to 12.98 vol.%, 0.17 vol.% to 3.23 vol.%, 0.23 vol.% to 9.05 vol.%, and 74.74 vol.% to 99.10 vol.%, respectively. The ternary facies plot of maceral composition substan- tiated that Barakar shales are vitrinite rich and placed in the thermal-dry gas prone region. The low values of the surface area determined following different methods point towards low methane storage capacity, this is because of diagenesis and alterations of potash feldspar responsible for pore blocking effect. The pore size distribution signifying the micro to mesoporous nature, while Type II sorption curve with the H2 type of hysteresis pattern, specifies the heterogeneity in pore structure mainly combined-slit and bottle neck pores.

关键词： shale gas petrographic composition surface area pore disposition pore volume.

Nonlinear analysis of traffic jams in an anisotropic continuum model

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Chinese Physics B 2010年第11期19卷 156-164页

作者： Arvind Kumar Gupta Sapna Sharma Department of Mathematics IIT Ropar-140001India Mathematics Group Birla Institute of Technology and SciencePilani-333031India

This paper presents our study of the nonlinear stability of a new anisotropic continuum traffic flow model in which the dimensionless parameter or anisotropic factor controls the non-isotropic character and diffusive influence. In order to establish traff^c flow stability criterion or to know the critical parameters that lead, on one hand, to a stable response to perturbations or disturbances or, on the other hand, to an unstable response and therefore to a possible congestion, a nonlinear stability criterion is derived by using a wavefront expansion technique. The stability criterion is illustrated by numerical results using the finite difference method for two different values of anisotropic parameter. It is also been observed that the newly derived stability results are consistent with previously reported results obtained using approximate linearisation methods. Moreover, the stability criterion derived in this paper can provide more refined information from the perspective of the capability to reproduce nonlinear traffic flow behaviors observed in real traffic than previously established methodologies.

关键词： traffic flow non-linear stability wavefront method

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预测雷诺应力输运模型的机器学习算法评估

Acta Mechanica Sinica 2022年第4期38卷 78-90,I0002页

作者： Jyoti Prakash Panda Hari Vijayan Warrior Department of Mechanical Engineering DIT UniversityDehradun 248001India Department of Ocean Engineering and Naval Architecture Indian Institute of Technology(IIT)Kharagpur 721302India

近年来,机器学习(ML)算法在湍流建模中的应用显示出了希望,但它们的应用仅限于基于涡流黏度的封闭方法.本文讨论了应用机器学习与高保真湍流数据的基本原理,以开发雷诺应力传输建模水平的模型.基于这些理论.本文比较了不同的机器学习算... 详细信息

近年来,机器学习(ML)算法在湍流建模中的应用显示出了希望,但它们的应用仅限于基于涡流黏度的封闭方法.本文讨论了应用机器学习与高保真湍流数据的基本原理,以开发雷诺应力传输建模水平的模型.基于这些理论.本文比较了不同的机器学习算法.以确定它们在雷诺应力输运方程中建模不同输运过程的有效性和鲁棒性.这些数据驱动的算法包括随机森林、梯度增强树和神经网络.采用直接数值模拟(DNS)数据作为ML模型的训练和测试.利用贝叶斯优化方法确定了ML算法的最优超参数.在雷诺应力输运方程的建模和预测中,评估了上述算法的有效性.观察到三种算法都以可接受的精度水平预测湍流参数.再将这些模型应用在不同于训练的流动情况的压力应变相关性的预测.以评估其鲁棒性和通用性.这探讨了基于ML的数据驱动湍流模型可以克服传统湍流模型的建模局限性.并且ML模型用大量不同类型的流数据训练.可以对具有相似流物理的未知流以合理的精度预测流场.除此之外,本文通过评估不同输入特征的重要性来验证最终的ML模型.

关键词： Machine learning Pressure strain correlation Turbulence modeling CFD