检索结果-南通市图书馆

Effect of Lanthanum on Nodule Count and Nodularity of Ductile Iron

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2007年第5期25卷 533-536页

作者： M. ashraf Sheikh Javed Iqbal University of Engineering & Technology

The present study aims at finding out the effect of the addition of a single rare earth element, that is, lanthanum on the nodularity and nodule count of ductile iron under controlled conditions. For this purpose, four melts with different compositions were made, using a 28 kg inductotherm medium frequency induction furnace. The temperature was carefully maintained between 1400 and 1450 ℃ for these heats. A good quality charge consisting of Sorel metal, ferrosilicon, Swedish iron, ferrosilicon magnesium, and ferrosilicon lanthanum was used for the production of melts. A vertically parted sand mould was used for casting of 10 test bars made from local silica sand. Standard coin samples were chill-cast to conduct chemical analysis of the ductile iron. Mierostructure study of the samples was conducted using a Leica optical microscope. Nodule count and nodularity of the samples were carried out using an image analyzer. The results obtained indicated that with the increased addition of lanthanum the nodule count of ductile iron increased, thus making it evident that it played a significant role in increasing the mechanical properties. The highest nodule count of 467 was obtained with the addition of 0.03% lanthanum. However, the effect of lanthanum on nodularity was negligible with nodularity ranging from 81% to 83 %.

关键词： ductile iron mischmetal nodulization nodulafity nodule count rare earths

Some Remarks Concerning Hyperholomorphic B-Manifolds

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2008年第6期29卷 631-640页

作者： arif SALIMOV Murat ISCAN Kursat AKBULUT Department of Geometry Baku State University Department of Mathematics Faculty of Arts and Sciences Ataturk University Department of Mathematics Faculty of Arts and SciencesAtaturk University

The authors consider a differentiable manifold with H-structure which is an isomorphic representation of an associative, commutative and unitial algebra. For Riemannian metric tensor fields, the φ-operators associated with r-regular H-structure are introduced. With the help of φ-operators, the hyperholomorphity condition of B-manifolds is established.

关键词： Pure tensor field Interior product Holomorphic tensor B-Manifold

A review on edge analytics:Issues,challenges,opportunities,promises,future directions,and applications

在线全文

学校读者我要写书评

暂无评论

Digital Communications and Networks 2024年第3期10卷 783-804页

作者： Sabuzima Nayak Ripon Patgiri Lilapati Waikhom arif Ahmed National Institute of Technology Silchar India Ericsson Sweden

Edge technology aims to bring cloud resources(specifically,the computation,storage,and network)to the closed proximity of the edge devices,i.e.,smart devices where the data are produced and *** computing and application in edge devices lead to emerging of two new concepts in edge technology:edge computing and edge *** analytics uses some techniques or algorithms to analyse the data generated by the edge *** the emerging of edge analytics,the edge devices have become a complete ***,edge analytics is unable to provide full support to the analytic *** edge devices cannot execute advanced and sophisticated analytic algorithms following various constraints such as limited power supply,small memory size,limited resources,*** article aims to provide a detailed discussion on edge *** key contributions of the paper are as follows-a clear explanation to distinguish between the three concepts of edge technology:edge devices,edge computing,and edge analytics,along with their *** addition,the article discusses the implementation of edge analytics to solve many problems and applications in various areas such as retail,agriculture,industry,and ***,the research papers of the state-of-the-art edge analytics are rigorously reviewed in this article to explore the existing issues,emerging challenges,research opportunities and their directions,and applications.

关键词： Edge analytics Edge computing Edge devices Big data Sensor Artificial intelligence Machine learning Smart technology Healthcare

Musical Isomorphisms and Problems of Lifts

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2016年第3期37卷 323-330页

作者： Rabia CAKAN Kursat AKBULUT arif SALIMOV Department of Mathematics Ataturk University Azerbaijan National Academy of Sciences Institute of Mathematics and Mechanics

Using the complete lift on tangent bundles, the authors construct the complete lift on cotangent bundles of tensor fields with the aid of a musical isomorphism. In this new framework, the authors have a new intrepreta... 详细信息

关键词： Tensor fields Cotangent bundles Complete lift Anti-Hermitian metric Riemannian extension

A New Approach to Vague Soft Bi-Topological Spaces

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2022年第4期131卷 411-428页

作者： arif Mehmood Saleem Abdullah Choonkil Park Department of Mathematics&Statistics Riphah International UniversityIslamabad44000Pakistan Department of Mathematics AbdulWali Khan UniversityMardan23200Pakistan Department of Mathematics Research Institute for Natural SciencesHanyang UniversitySeoul04763Korea

Fuzzy soft topology considers only membership *** has nothing to do with the non-membership *** an extension was needed in this *** soft topology addresses bothmembership and non-membership values *** vague soft topology(single structure)is unable to address some complex *** an extension to vague soft bi-topology(double structure)was needed in this *** make this situation more meaningful,a new concept of vague soft bi-topological space is introduced and its structural characteristics are attempted with a new *** this article,new concept of vague soft bi-topological space(VSBTS)is initiated and its structural behaviors are *** approach is based on generalized vague soft open sets,known as vague softβopen *** ample of examples are given to understand the *** the non-validity of some results,counter examples are provided to pay the ***-wise vague softβopen and pair-wise vague softβclose sets are alsoaddressedwith examples in(VSBTS).Vague soft separation axioms are initiatedin(VSBTS)concerning soft points of the *** separation axioms are also addressed relative to soft points of the *** soft bi-topological properties are studied with the application of vague softβopen sets with respect to soft points of the *** characterization of vague softβclose as well as vague softβopen sets,characteristics of Bolzano Weirstrass property,vague soft compactness and its marriage with sequences,interconnection between sequential compactness and countable compactness in(VSBTS)with respect to softβopen sets are addressed.

关键词： Vague soft set vague soft point vague soft bi-topological space vague softβ-open set and vague softβ-separation axioms

An Active Image Forgery Detection Approach Based on Edge Detection

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

Computers, Materials & Continua 2023年第4期75卷 1603-1619页

作者： Hüseyin Bilal Macit arif Koyun Department of IT Systems and Technologies Mehmet Akif Ersoy UniversityBucak Z.T.School of Applied Technology and BusinessBurdur15300Türkiye Department of Computer Engineering Suleyman Demirel UniversityEngineering FacultyIsparta32200Türkiye

Recently, digital images have become the most used data, thanks tohigh internet speed and high resolution, cheap and easily accessible digitalcameras. We generate, transmit and store millions of images every *** of these images are insignificant images containing only personal ***, in many fields such as banking, finance, public institutions,and educational institutions, the images of many valuable objects like IDcards, photographs, credit cards, and transaction receipts are stored andtransmitted to the digital environment. These images are very significantand must be secured. A valuable image can be maliciously modified by anattacker. The modification of an image is sometimes imperceptible even by theperson who stored the image. In this paper, an active image forgery detectionmethod that encodes and decodes image edge information is proposed. Theproposed method is implemented by designing an interface and applied on atest image which is frequently used in the literature. Various tampering attacksare simulated to test the fidelity of the method. The method not only notifieswhether the image is forged or not but also marks the tampered region ofthe image. Also, the proposed method successfully detected tampered regionsafter geometric attacks, even on self-copy attacks. Also, it didn’t fail on JPEGcompression.

关键词： Image forgery image tampering edge detection

A Hybrid Quantum Inspired Particle Swarm Optimization and Least Square Framework for Real-time Harmonic Estimation

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

Journal of Modern Power Systems and Clean Energy 2021年第6期9卷 1548-1556页

作者： Abu Bakar Waqas Muhammad Mansoor ashraf Yasir Saifullah Department of Communication Science and Engineering School of Information Science and TechnologyFudan University Electrical Engineering Department University of Engineering and Technology

The power quality is becoming an extensively addressing aspect of the power system because of the sensitive operation of the smart grid, awareness of power quality, and the equipment of modern power systems. In this paper, we have conceived a new hybrid Quantum inspired particle swarm optimization and least square(QPSO-LS) framework for real-time estimation of harmonics presented in time-varying noisy power signals. The technique has strong, robust, and reliable search capability with powerful convergence properties. The proposed approach is applied to various test systems at different signal to noise ratio(SNR) levels in the presence of uniform and Gaussian noise. The results are presented in terms of precision, computation time, and convergence characteristics. The computation time decreases by 3-5 times as compared to the existing algorithms. The technique is further authenticated by estimating harmonics of real-time current or voltage waveforms, obtained from light emitting diode(LED) lamp and axial flux permanent magnet synchronous generator(AFPMSG). The results demonstrate the superiority of QPSO-LS over other methods such as LS-based genetic algorithm(GA), particle swarm optimization(PSO), bacterial foraging optimization(BFO), artificial bee colony(ABC), and biogeography based optimization with recursive LS(BBO-RLS) algorithms, in terms of providing satisfactory solutions with a significant amount of robustness and computation efficiency.

关键词： Harmonic estimation power quality particle swarm optimization(PSO) least square(LS) smart grid

Cumulative Capacity Credit Estimation for Renewable Energy Projects

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2024年第5期12卷 1643-1651页

作者： arif S.Malik Majid A.Al Umairi the Electrical and Computer Engineering Department Sultan Qaboos UniversityAl-Khod 123Oman Oman Electricity Transmission Company MuscatOman Electrical and Computer Engineering Department Sultan Qaboos UniversityAl-Khod 123Oman

This paper presents a novel method for accurately estimating the cumulative capacity credit(CCC)of renewable energy(RE)*** data from the main interconnected system(MIS)of Oman for 2028,where a substantial increase in RE generation is anticipated,the method is introduced alongside the traditional effective load carrying capability(ELCC)*** ensure its robustness,we compare CCC results with ELCC calculations using two distinct standards of reliability criteria:loss of load hours(LOLH)at 24 hour/year and 2.4 hour/*** method consistently gives accurate results,emphasizing its exceptional accuracy,efficiency,and simplicity.A notable feature of the method is its independence from loss of load probability(LOLP)calculations and the iterative procedures associated with analytic-based reliability ***,it relies solely on readily available data such as annual hourly load profiles and hourly generation data from integrated RE *** innovation is of particular significance to prospective independent power producers(IPPs)in the RE sector,offering them a valuable tool for estimating capacity credits without the need for sensitive generating unit forced outage rate data,often restricted by privacy concerns.

关键词： Effective load carrying capability renewable energy resource capacity credit generation system reliability loss of load probability

Deciphering codon usage patterns and evolutionary forces in chloroplast genes of Camellia sinensis var. assamica and Camellia sinensis var. sinensis in comparison to Camellia pubicosta

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2019年第12期18卷 2771-2785页

作者： Sophiarani Yengkhom arif Uddin Supriyo Chakraborty Department of Biotechnology Assam UniversitySilchar 788011AssamIndia Department of Zoology Moinul Hoque Choudhury Memorial Science CollegeAlgapurHailakandi 788150AssamIndia

Codon usage bias(CUB) is a unique property of genome which refers to non-random usage of synonymous codons in coding sequences. The present study makes an attempt to find out the pattern of CUB in chloroplast(cp) genes among three tea species, i.e., Camellia sinensis var. assamica(Assam tea), Camellia sinensis var. sinensis(Chinese tea) and Camellia pubicosta(wild tea species) as no work on CUB was reported earlier. To understand the patterns of codon usage among the cp genes of three tea groups, we used bioinformatic tools to investigate the protein coding sequences of cp genes. In our present study, the mean nucleobase T was the highest whereas C was the lowest in all the three tea groups. The overall AT content was more than GC content, i.e., genes were AT rich. The scaled chi-square(SCS) value indicated that the CUB of cp genes was low. The codon CGT(Arg) was over-represented in C. sinensis var. sinensis whereas GGA(Pro) was over-represented in C. pubicosta species. Heatmap study revealed that most of the GC ending codons showed positive correlations between codon usage and GC3 while AT ending codons exhibited negative correlations. From neutrality plot analysis, it was evident that natural selection had played a major role, while mutation pressure exerted a minor effect in the CUB of cp genes in three tea groups. Highly significant(P<0.01) positive correlation was found between SCS and synonymous codon usage order(SCUO) of cp genes which suggested that high expression of cp genes was associated with high degree of CUB.

关键词： Camellia sinensis var.assamica Camellia sinensis var.sinensis Camellia pubicosta chloroplast genes codon usage bias mutation natural selection