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A Key Management Scheme Using(p,q)-Lucas Polynomials in Wireless Sensor Network

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China Communications 2021年第11期18卷 210-228页

作者： Amit Kumar gautam Rakesh Kumar Madan Mohan Malaviya University of Technology Gorakhpur-273001India

Wireless Sensor Network(WSN)has witnessed an unpredictable growth for the last few *** has many applications in various critical sectors such as real-time monitoring of nuclear power plant,disaster management,environment,military area ***,due to the distributed and remote deployment of sensor nodes in such networks,they are highly vulnerable to different security *** sensor network always needs a proficient key management scheme to secure data because of resourceconstrained *** polynomial based key management schemes are simple,but the computational complexity is a big *** polynomials,Fibonacci polynomials,Chebychev polynomials are used in Engineering,Physics,Combinatory and Numerical analysis *** this paper,we propose a key management scheme using(p,q)-Lucas polynomial to improve the security of ***(p,q)-Lucas polynomial,p represents a random base number while q represents a substitute value of x in the *** value of p is unique,and q is different according to communication between *** of the proposed method on several parameters such as computational overhead,efficiency and storage cost have been performed and compared with existing related *** analysis demonstrates that the proposed(p,q)-Lucas polynomial based key management scheme outperforms over other polynomials in terms of the number of keys used and efficiency.

关键词： key management lucas polynomial WSN security pairwise key distribution key generation hierarchical key management

Grinding analysis of Indian coal using response surface methodology

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International Journal of Coal Science & Technology 2016年第2期3卷 184-190页

作者： Twinkle Singh Aishwarya Awasthi Pranjal Tripathi Shina gautam Alok gautam Jaypee University of Engineering & Technology A-B RoadRaghogarh Guna India Shroff S. R. Rotary Institute of Chemical Technology Ankleshwar Gujarat India

The present work discusses a systematic approach to model grinding parameters of coal in a ball mill. A three level Box-Behnken design combined with response surface methodology using second order model was applied to the experiments done according to the model requirement. Three parameters ball charge （numbers 10-20）, coal content （100-200 g） and the grinding time （4-8 rain） were chosen for the experiments as well as for the modeling work. Coal fineness is defined as the dso （80 % passing size）. A quadratic model was developed to show the effect of parameters and their interaction with fineness of the product. Three different sizes （4, 1 and 0.65 mm） of Indian coal were used. The model equations for each fraction were developed and different sets of experiments were performed. The predicted values of the fineness of coal were in good agreement with the experimental results （R2 values of dso varies between 0.97 and 0.99）. Fine size of three different coal sizes were obtained with larger ball charge with less grinding time and less solid content. This work represents the efficient use of response surface methodology and the Box-Behnken design use for grinding of Indian coal.

关键词： Coal grinding Ball mill Grinding time Response surface methodology

Gasification kinetic studies of low volatile weakly caking coal

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International Journal of Coal Science & Technology 2023年第2期10卷 159-168页

作者： Akanksha Mishra Shalini gautam Tripurari Sharma Department of Mechanical Engineering Sharda School of Engineering and TechnologySharda UniversityG.NoidaIndia Department of Fuel Minerals and Metallurgical EngineeringIndian Institute of Technology(ISM)DhanbadIndia

Present investigation focuses on the fractional conversion of low volatile weakly caking coal(LVWC)under the standard set of operating conditions for *** this purpose,samples of LVWC of different ash content have been collected from Kusunda Area of Bharat Coking Coal *** results were validated using Homogenous and Shrinking Core kinetic models and the suitability of selected samples for gasification was assessed by estimating the activation *** values of activation energy for LVWC samples were obtained in the range of 25.17-44.09 kJ/***,empirical models were developed to correlate the response of interest with the input variables(temperature,residence time and CO_(2) flow rate).The significance of these developed empirical models was checked using analysis of variance(ANOVA).

关键词： LVWC Gasification CO_(2) Activation energy

An alternative interpretation for the map expression of "abrupt" changes in lateral stratigraphic level near transverse zones in fold-thrust belts

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Geoscience Frontiers 2012年第4期3卷 401-406页

作者： Sanghoon Kwon gautam Mitra Department of Earth System Sciences Yonsei UniversitySeoul 120-749Republic of Korea Department of Earth and Environmental Sciences University of RochesterRochesterNY 14627USA

The map expression of ＂abrupt＂ changes in lateral stratigraphic level of a thrust fault has been traditionally interpreted to be a result of the presence of （1） a lateral （or oblique） thrust-ramp, or （2） a frontal ramp with displacement gradient, and/or （3） a combination of these geometries. These geometries have been used to interpret the structures near transverse zones in fold-thrust belts （FTB）. This contribution outlines an alternative explanation that can result in the same map pattern by lateral variations in stratigraphy along the strike of a low angle thrust fault. We describe the natural example of the Leamington transverse zone, which marks the southern margin of the Pennsylvanian-Permian Oquirrh basin with genetically related lateral stratigraphic variations in the North American Sevier FTB. Thus, the observed map pattern at this zone is closely related to lateral stratigraphic variations along the strike of a horizontal fault. Even though the present-day erosional level shows the map pattern that could be interpreted as a lateral ramp, the observed structures along the Leamington zone most likely share the effects of the presence of a lateral （or oblique） ramp, lateral stratigraphic variations along the fault trace, and the displacement gradient.

关键词： Lateral stratigraphic changes Fold-thrust belt Transverse zone Frontal ramp Lateral ramp Displacement gradient

Pushover analysis of underground structures:Method and application

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Science China(Technological Sciences) 2014年第2期57卷 423-437页

作者： LIU JingBo WANG WenHui DASGUPTA gautam Institute Department of Civil Engineering Tsinghua University Department of Civil Engineering and Engineering Mechanics Columbia UniversityNew York NY 10027 USA

Pushover analysis is common because of its conceptual simplicity and computational attractiveness in computing seismic *** that traditional pushover analysis is restricted in underground structures due to the stark differences in the seismic response characteristics of surface structures,this paper proposes a pushover analysis method for underground structures and its application in seismic damage ***,three types of force distribution are presented based on ground response ***,the target displacements and analysis models are established according to force-based and performance-based ***,the pushover analysis procedure for underground structures is ***,the applicability of pushover analysis to underground structures is verified by comparing the responses of a Chongwenmen subway station determined by the proposed procedure and by nonlinear response history *** addition,two other points are made:that the inverted triangular distribution of effective earthquake acceleration is more practical than the other two distributions,and that performance-based design is more effective than force-based ***,a cyclic reversal loading pattern based on one cycle of reversal loads as an earthquake event is presented and applied to the seismic damage assessment of underground *** results show that the proposed pushover analysis can be effectively applied to the seismic design and damage assessment of underground structures.

关键词： underground structure pushover analysis seismic demand seismic damage assessment

Estimation of above-ground biomass and carbon stock of an invasive woody shrub in the subtropical deciduous forests of Doon Valley,western Himalaya,India

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Journal of Forestry Research 2015年第2期26卷 291-305页

作者： gautam Mandal S.P.Joshi Ecology Research Laboratory Department of BotanyDAV (PG) College Faculty of Science The Lawrence School

This study describes the different parameters used to derive the allometric equation for calculating the biomass of an invasive woody shrub Lantana camara *** the subtropical conditions of western *** identifies the most accurate and convenient method for biomass calculation by comparing destructive with nondestructive *** parameters were measured on a wide range of Lantana from different community levels for the non-destructive calculation of total aboveground *** explanatory variables were identified and measured such as basal diameter either as a single independent variable or in combination with plant *** other suitable combinations of available independent variables include crown length,crown width,crown area,crown volume and coverage of the *** the wide range of allometric equations used with different variables,the equation with D2 H as a variable was found to be the most suitable estimator of biomass calculation for ***,being the most disturbed area due to its high tourist activity round the year,showed maximum coverage（58.57 % ha-1）,highest biomass（13,559.60 kg ha-1） and carbon density（6,373.01 kg ha-1）of *** degree of Lantana’s invasiveness in subtropical conditions was also calculated on the basis of importance value index（IVI）.The maximum IVI（22.77）and mean coverage（26.8 % ha-1） was obtained from the areas near Jolly Grant airport,indicating that physically disturbed areas are more suitable for the growth of Lantana,which may significantly increase shrub *** importance of incorporating allometric equations in calculation of shrub biomass,and its role in atmospheric carbon assimilation has thus been highlighted through the findings of this study.

关键词： Above ground carbon pools Allometric regression equations Carbon density Importance value index(IVI) Shrub biomass

Effect of disturbance on biomass,production and carbon dynamics in moist tropical forest of eastern Nepal

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Forest Ecosystems 2016年第3期3卷 221-230页

作者： Tilak Prasad gautam Tej Narayan Mandal Department of Botany Mahendra Morang Adarsha Multiple CampusTribhuvan University Department of Botany Post Graduate Campus Tribhuvan University

Background： Forest biomass is helpful to assess its productivity and carbon （C） sequestration capacity. Several disturbance activities in tropical forests have reduced the biomass and net primary production （NPP） leading to climate change. Therefore, an accurateestimation of forest biomass and C cycling in context of disturbances is required for implementing REDD （Reducing Emissions from Deforestation and Forest Degradation） policy. Methods： Biomass and NPP of trees and shrubs were estimated by using allometric equations while herbaceous biomass was estimated by harvest method. Fine root biomass was determined from soil monolith. The C stock in vegetation was calculated by multiplying C concentration to dry weight. Results： Total stand biomass （***-1） in undisturbed forest stand （US） was 960.4 while in disturbed forest stand （DS） it was 449.1. The biomass （***-1） of trees, shrubs and herbs in US was 948.0, 4.4 and 1.4, respectively, while in DS they were 438.4, 6.1 and 1.2, respectively. Total NPP （***-1） was 26.58 （equivalent to 12.26 Mg ***-1） in US and 14.91 （6.88 Mg ***-1） in DS. Total C input into soil through litter plus root turnover was 6.78 and 3.35 ***-1 in US and DS, respectively. Conclusions： Several disturbance activities resulted in the significant loss in stand biomass （53 %）, NPP （44 %）, and C sequestration capacity of tropical forest vegetation is far greater than that returned to the soil n eastern Nepal. The net uptake of carbon by the by the turnover of fine root and litter. Therefore, both stands of present forest act as carbon accumulating systems. Moreover, disturbance reflects higher C emissions which can be reduced by better management.

关键词： Tropical forest Disturbance Biomass Production Carbon cycling Nepa

One-dimensional ZnS-based Hetero-,Core/shell and Hierarchical Nanostructures

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Journal of Materials Science & Technology 2008年第4期24卷 520-528页

作者： Ujjal K.gautam Yoshio BANDO Dmitri GOLBERG Nanoscale World Premier International Center for Materials Nanoarchitectonics and Nanoscale Materials Center National Institute for Materials ScienceNamiki 1-1TsukbaIbaraki 305-0044Japan

A focus of the current nanotechnology has shifted from routine fabrication of nanostructures to designing functional electronic devices and realizing their immense potentials for applications. Due to infusion of multi-functionality into a single system, the utilization of hetero-, core/shell and hierarchical nanostructures has become the key issue for building such devices. ZnS, due to its direct wide bandgap, high index of refraction, high transparency in the visible range and intrinsic polarity, is one of the most useful semiconductors for a wide range of electronics applications. This article provides a dense review of the state-of-the-art research activities in one-dimensional （1D） ZnS-based hetero-, core/shell and hierarchical nanostructures. The particular emphasis is put on their syntheses and applications.

关键词： Heterostructures Core/shell Hierarchical structures ZnS Nanodevices

Special issue on machine learning-driven big data and blockchain techniques for communication

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Digital Communications and Networks 2023年第1期9卷 1-2页

作者： Shahid Mumtaz gautam Srivastava Wei Wei Instituto de Telecomunicaces Portugal Brandon University Canada Xi'an University of Technology China

Guest Editorial Currently,the rapid development of storage technologies combined with some potential factors such as mobile networks,Internet of Things(IoT),cloud computing and the emergence of new technologies pose some problems for big data processing and blockchain security in the communication ***,the complexity of network security and data processing has increased dramatically,making it more difficult and challenging to solve various problems in the communication ***,Machine Learning(ML)algorithms have been proposed to process big data and enhance blockchain security and further enable intelligent analysis in the communication domain.

关键词： networks communication enable