检索结果-南通市图书馆

Slags containing transition metal(chromium and vanadium)oxides——Conversion from ticking bombs to valuable resources:Collaborative studies between KTH and USTB

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2022年第4期29卷 750-757页

作者： seshadri Seetharaman Lijun Wang Haijuan Wang Royal Institute of Technology(KTH) Stockholm 10044Sweden Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

As the steel industry expands worldwide,slag dumps with transition metals(especially chromium and vanadium)are becoming more common,posing a serious environmental *** the properties of slags containing transition metal oxides,as well as how to use the slags to recover and recycle metal values,is *** this end,the University of Science and Technology Beijing(USTB)and Royal Institute of Technology(KTH)have been collaborating on slags containing transition metals for *** research was carried out from a fundamental viewpoint to get a better understanding of the structure of these slags and their properties,as well as industrial *** research focused on the three“R”s,***,recovery,and *** present paper attempts to highlight some of the important achievements in these joint studies.

关键词： transition metals vanadium chromium recovery collaborative study

Controlling chaos and supressing chimeras in a fractional-order discrete phase-locked loop using impulse control

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第12期30卷 63-73页

作者： Karthikeyan Rajagopal Anitha Karthikeyan Balamurali ramakrishnan Centre for Nonlinear Systems Chennai Institute of TechnologyChennaiIndia Department of Electronics and Communication Engineering Prathyusha Engineering CollegeChennaiIndia

A fractional-order difference equation model of a third-order discrete phase-locked loop(FODPLL) is discussed and the dynamical behavior of the model is demonstrated using bifurcation plots and a basin of attraction. We show a narrow region of loop gain where the FODPLL exhibits quasi-periodic oscillations, which were not identified in the integer-order model. We propose a simple impulse control algorithm to suppress chaos and discuss the effect of the control step. A network of FODPLL oscillators is constructed and investigated for synchronization behavior. We show the existence of chimera states while transiting from an asynchronous to a synchronous state. The same impulse control method is applied to a lattice array of FODPLL, and the chimera states are then synchronized using the impulse control algorithm. We show that the lower control steps can achieve better control over the higher control steps.

关键词： discrete Josephson junction fractional order chaos impulse control chimera

Multiwavelets domain singular value features for image texture classification

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第4期8卷 538-549页

作者： ramakrishnan S. SELVAN S. Department of Information Technology PSG College of Technology Coimbatore 641 004India

A new approach based on multiwavelets transformation and singular value decomposition (SVD) is proposed for the classification of image textures. Lower singular values are truncated based on its energy distribution to classify the textures in the presence of additive white Gaussian noise (AWGN). The proposed approach extracts features such as energy, entropy, local homogeneity and max-min ratio from the selected singular values of multiwavelets transformation coefficients of image textures. The classification was carried out using probabilistic neural network (PNN). Performance of the proposed approach was compared with conventional wavelet domain gray level co-occurrence matrix (GLCM) based features, discrete multiwavelets transformation energy based approach, and HMM based approach. Experimental results showed the superiority of the proposed algorithms when compared with existing algorithms.

关键词： Image texture classification Multiwavelets transformation Probabilistic neural network (PNN)

Optimal Adaptive Genetic Algorithm Based Hybrid Signcryption Algorithm for Information Security

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2015年第5期105卷 47-68页

作者： R.Sujatha M.ramakrishnan N.Duraipandian B.ramakrishnan Velammal Engineering College Anna UniversityIndia School of Computer Applications Madurai Kamarajar UniversityIndia Department of Computer Science and Research Centre S.T.Hindu CollegeMadurai Kamarajar UniversityIndia

The functions of digital signature and public key encryption are simultaneously fulfilled by signcryption,which is a cryptographic *** securely communicate very large messages,the cryptographic primitive called signcryption efficiently implements the same and while most of the public key based systems are suitable for small messages,hybrid encryption(KEM-DEM)provides a competent and practical *** this paper,we develop a hybrid signcryption *** hybrid signcryption is based on the KEM and DEM *** KEM algorithm utilizes the KDF technique to encapsulate the symmetric *** DEM algorithm utilizes the Adaptive Genetic Algorithm based Elliptic curve cryptography algorithm to encrypt the original ***,for the security purpose,we introduce the three games and we proved the attackers fail to find the security attributes of our proposed signcryption *** proposed algorithm is analyzed with Daniel of Service(DOS),Brute Force attack and Man In Middle(MIM)attacks to ensure the secure data transaction.

关键词： Hybrid Signcryption KEM DEM Adaptive Genetic Algorithm EllipticCurve Cryptography

Examining the Factors that Influence the Use of Social Media for Disaster Management by Underserved Communities

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Disaster Risk Science 2022年第1期13卷 52-65页

作者： Thiagarajan ramakrishnan Louis Ngamassi Shahedur Rahman Accounting Financeand Management Information Systems(MIS)Prairie View A&M UniversityPrairie ViewTX 77446USA

This study examined the propensity of social media use by underserved communities by drawing on the literature on the digital divide and attribution ***,this research explored the factors that can influence the use of social media for disaster *** study used survey methodology to collect data and partial least squares structural equation modeling(PLSSEM)to analyze the data and test the *** results of the study indicate:(1)that the propensity of social media use for disaster management is low for underserved communities;(2)a positive relationship between an individual’s effort and the intention to use social media for disaster management;and(3)a negative relationship between task difficulty and the intention to use social media for disaster *** study expanded the literature on the use of social media in disaster *** article also provides both theoretical and practical implications.

关键词： Attribution theory Digital divide Disaster management Social media use Texas Underserved communities

Robust stability criteria for uncertain linear systems with interval time-varying delay

在线全文

学校读者我要写书评

暂无评论

控制理论与应用（英文版） 2011年第4期9卷 559-566页

作者： Krishnan ramakrishnan Goshaidas RAY Department of Electrical Engineering Indian Institute of Technology Kharagpur

This paper considers the robust delay-dependent stability problem of a class of linear uncertain system with interval time-varying delay and proposes less conservative stability criteria for computing the maximum allowable bound of the delay range. Less conservatism of the proposed stability criteria is attributed to the delay-central point method of stability analysis, wherein the delay interval is partitioned into two subintervals of equal length, and the time derivative of a candidate Lyapunov-Krasovskii functional based on delay decomposition technique is evaluated in each of these delay segments. In deriving the stability conditions in LMI framework, neither model transformations nor bounding techniques using free-weighting matrix variables are employed for dealing the cross-terms that emerge from the time derivative of the Lyapunov-Krasovskii functional; instead, they are dealt using tighter integral inequalities. The proposed analysis subsequently yields a stability condition in convex LMI framework that can be solved using standard numerical packages. For deriving robust stability conditions, two categories of system uncertainties, namely, time-varying structured and polytopic-type uncertainties, are considered. The effectiveness of the proposed stability criteria is validated through standard numerical examples.

关键词： Lyapunov-Krasovskii functional Robust stability Interval time-delay Delay-range-dependent stability Linear matrix inequality

Preventive Regulation of Jelly Seed Disorder in ‘Amrapali' Mango (Mangifera indica) by Preharvest Spray

在线全文

学校读者我要写书评

暂无评论

Horticultural Plant Journal 2019年第2期5卷 70-78页

作者： Shivashankar seshadri Sumathi Manoharan Hari Shankar Singh Division of Plant Physiology and Biochemistry ICAR-Indian Institute of Horticultural ResearchHesaraghatta Lake PO ICAR-National Centre for Integrated Pest Management Pusa Campus

Jelly seed, a physiological disorder in ‘Amrapali' mango fruit, is characterized by the excessive softening of pulp around the stone in ripe fruits. The disorder is caused by the onset of germination associated events in the seed of developing fruit due to decreased level of very-longchain fatty acids(VLCFAs) in seed. Field trials involving preharvest application of spray formulations on developing fruits, between 50% and 60%maturity, showed that formulation V(10 g·L^(-1) NaCl, 25 g·L^(-1) CaCl_2, 0.5 g·L^(-1) KCl, 0.01 g·L^(-1) H_3 BO_3, 0.01 g·L^(-1) Cu SO_4, 0.01 g·L^(-1) Zn SO_4,0.01 g·L^(-1) FeSO_4, 0.01 g·L^(-1) MnSO_4, and 0.002 g·L^(-1) EDTA) was the most effective in preventing the jelly seed disorder. Further studies to understand the mode of action of the formulation in controlling jelly seed development, revealed increased synthesis of VLCFAs in seed followed by the rapid production of ABA and germination-inhibiting phenolic acids, besides increased accumulation of calcium in seed. These factors acting in unison delayed seed germination and decreased the activities of pectinolytic enzymes in pulp to produce healthy fruits, free from jelly seed *** was an increase of mineral nutrient content in pulp of treated healthy fruits. Thus, the study helped to develop a remedy to prevent jelly seed besides revealing the biochemical mechanism by which formulation V acted to produce ‘Amrapali' mango fruits free of jelly seed with improved nutritional quality.

关键词： Amrapali mango jelly seed physiological disorder prevention preharvest treatment

Hydromagnetic flow through uniform channel bounded by porous media

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2011年第7期32卷 837-846页

作者： K.ramakrishnan K.SHAILENDHRA Department of Mathematics Sri Krishna College of Engineering and TechnologySugunapuramKuniamuthurCoimbatore 641008TamilnaduIndia Department of Mathematics Amirta School of EngineeringAmirta Vishwa VidyapeethamCoimbatore 641105TamilnaduIndia

The combined effects of the magnetic field, permeable walls, Darcy velocity, and slip parameter on the steady flow of a fluid in a channel of uniform width are studied. The fluid flowing in the channel is assumed to be homogeneous, incompressible, and Newtonian. Analytical solutions are constructed for the governing equations using Beavers-Joseph slip boundary conditions. Effects of the magnetic field, permeability, Darcy velocity, and slip parameter on the axial velocity, slip velocity, and shear stress are discussed in detail. It is shown that the Hartmann number, Darcy velocity, porous parameter, and slip parameter play a vital role in altering the flow and in turn the shear stress.

关键词： uniform channel permeable wall magnetic field slip velocitY shear stress

Conductivity properties of β-SiAlON ceramics

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2012年第9期55卷 2409-2415页

作者： DONG PengLi WANG XiDong ZHANG Mei seshadri Seetharaman The Chinese Society for Metals Beijing 100711China College of Engineering Peking UniversityBeijing 100871China Department of Physical Chemistry University of Science and Technology BeijingBeijing 100083China Department of Materials Science Engineering Royal Institute of TechnologyStockholm SE 100-44Sweden

The thermal diffusivity and heat capacity of β-SiAION ceramics with different Z values （0.6, 1.5, 3.0） were measured by laser flash technique and differential scanning calorimetry （DSC）, respectively. The thermal conductivity of β-SiAION was calculated from thermal diffusivity, heat capacity and density and it decreased and then kept almost constant with increasing of temperature. Two different models representing effective thermal conductivity were established and the various parameters of these models were simulated based on the results from the present work. The fitted regression lines were in good agreement with the experimental values.

关键词： β-SiAION thermal diffusivity heat capacity effective thermal conductivity