检索结果-南通市图书馆

符号函数矩阵判别法在水盐相图计算机成图中的应用Ⅰ.NaCl-kCl-H_2O型W_1-W_2,X_1-X_2和m_1-m_2相图

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

四川大学学报（自然科学版） 1998年第4期35卷 601-606页

作者：汪蓉胡家文唐明林殷辉安成都理工学院应用化学系

作者曾提出关于多体系相图计算机成图的符号函数矩阵法（ＳＦＭ）．现以ＮａＣｌＫＣｌＨ２Ｏ和ＫＣｌＫＮＯ３Ｈ２Ｏ在１０１３２５Ｐａ及２９８．１５Ｋ条件下的相图为例，用这种方法处理了简单共饱型的三元水盐体系Ｗ１Ｗ... 详细信息

作者曾提出关于多体系相图计算机成图的符号函数矩阵法（ＳＦＭ）．现以ＮａＣｌＫＣｌＨ２Ｏ和ＫＣｌＫＮＯ３Ｈ２Ｏ在１０１３２５Ｐａ及２９８．１５Ｋ条件下的相图为例，用这种方法处理了简单共饱型的三元水盐体系Ｗ１Ｗ２，Ｘ１Ｘ２，ｍ１ｍ２相图计算机成图中的几个关键问题。

关键词：符号函数矩阵水盐相图计算机成图判别矩阵

维普期刊数据库

Heterogeneous Ensemble Feature Selection model(HEFSm)for Big Data Analytics

在线全文

学校读者我要写书评

暂无评论

computer Systems science & Engineering 2023年第5期45卷 2187-2205页

作者： m.Priyadharsini k.karuppasamy department of Information technology Sri Ramakrishna Engineering CollegeCoimbatoreTamilnaduIndia department of computer science&Engineering RVS College of Engineering and TechnologyCoimbatoreTamilnaduIndia

Big Data applications face different types of complexities in *** and purifying data by eliminating irrelevant or redundant data for big data applications becomes a complex operation while attempting to maintain discriminative features in processed *** existing scheme has many disadvantages including continuity in training,more samples and training time in feature selections and increased classification execution *** ensemble methods have made a mark in classification tasks as combine multiple results into a single *** comparing to a single model,this technique offers for improved *** based feature selections parallel multiple expert’s judgments on a single *** major goal of this research is to suggest HEFSm(Heterogeneous Ensemble Feature Selection model),a hybrid approach that combines multiple *** major goal of this research is to suggest HEFSm(Heterogeneous Ensemble Feature Selection model),a hybrid approach that combines multiple ***,individual outputs produced by methods producing subsets of features or rankings or voting are also combined in this ***(k-Nearest Neighbor)classifier is used to classify the big dataset obtained from the ensemble learning *** results found of the study have been good,proving the proposed model’s efficiency in classifications in terms of the performance metrics like precision,recall,F-measure and accuracy used.

关键词： PSO(Particle Swarm Optimization) GWO(GreyWolf Optimization) EHO(Elephant Herding Optimization) data mining big data analytics feature selection HEFSm classifier

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

关于子图参数的内插问题

西北工业大学学报 1988年第4期 407-414页

作者：徐济超王自果西北工业大学西北工业大学硕士郑州航空学院教师副教授

设 G1和 G2是图 G 的两个子图,G1和 G2对应的某个参数的值分别为非负整数 m 和 n,且 mm<kk,是否存在 G 的子图 G0,使其相应的参数值为 k 呢?本文证明了当子图 G1和 G2是无环连通图 G 的支撑树时,对若干参... 详细信息

设 G1和 G2是图 G 的两个子图,G1和 G2对应的某个参数的值分别为非负整数 m 和 n,且 mmkk,是否存在 G 的子图 G0,使其相应的参数值为 k 呢?本文证明了当子图 G1和 G2是无环连通图 G 的支撑树时,对若干参数存在至少ρ个这样的支撑树 G0。还证明了当子图 G1和 G2是 G 的子树时,对若干参数存在至少一个这样的子树 G0。

关键词：图子图子树支撑树

Candidate Eclipsing Binary Systems with aδScuti Star in Northern tESS Field

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2022年第8期22卷 34-48页

作者： F.kahraman Aliçavuş D.Gümüş Ö.kırmızıtaş Ö.Ekinci S.Çavuş Y.t.kaya F.Aliçavuş Çanakkale Onsekiz mart university Faculty of Sciences and ArtsPhysics Department17100ÇanakkaleTurkey Çanakkale Onsekiz mart university Astrophysics Research Center and Ulupnar ObservatoryTR-17100ÇanakkaleTurkey Istanbul university Institute of Graduate Studies in ScienceProgramme of Astronomy and Space Sciences34116BeyazıtIstanbulTurkey Çanakkale Onsekiz mart university School of Graduate StudiesDepartment of PhysicsTR-17100ÇanakkaleTurkey Çanakkale Onsekiz mart university School of Graduate StudiesDepartment of Space Sciences and TechnologiesTR-17100ÇanakkaleTurkey Çanakkale Onsekiz mart university Faculty of Engineering Computer EngineeringTR-17100ÇanakkaleTurkey

the existence of pulsating stars in eclipsing binaries has been known for *** types of objects are extremely valuab.e systems for astronomical studies as they exhibit both eclipse and pulsation *** eclipsing binaries are the only way to directly measure the mass and radius of stars with a good accuracy(≤1%),while the pulsations are a unique way to probe the stellar interior via oscillation *** are different types of pulsating stars existing in eclipsing *** of them is theδScuti ***,the known number ofδScuti stars in eclipsing binaries is around 90 according to the latest catalog of these *** increasing number of these kinds of variab.es is important to understand the stellar structure,evolution and the effect of binarity on the ***,in this study,we focus on discovering new eclipsing binaries withδScuti component(s).We searched within the northern transiting Exoplanet Survey Satellite(tESS)field with a visual inspection by following some criteria such as light curve shape,the existence of pulsation like variations in the out-of-eclipse light curve and the t_(eff) values of the *** a result of these criteria,we discovered some *** orbital variations were first removed from the tESS light curves and frequency analysis was performed on the *** luminosity,and ab.olute and bolometric magnitudes of the targets were calculated as *** find how much of these parameters represent the primary(more luminous)binary component,we also computed the flux density ratio of the systems by utilizing the area of the *** addition,the positions of the systems in the H-R diagram were examined considering the flux density *** a consequence of the investigation,we defined 38 candidateδScuti stars and also one maia variab.e in eclipsing binary systems.

关键词： (stars:)binaries:eclipsing stars:variab.es:delta Scuti techniques:photometric

two-photon polymerization lithography for imaging optics

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 Extreme manufacturing 2024年第4期6卷 21-60页

作者： Hao Wang Cheng-Feng Pan Chi Li kishan S menghrajani markus A Schmidt Aoling Li Fu Fan Yu Zhou Wang Zhang Hongtao Wang Parvathi Nair Suseela Nair John You En Chan tomohiro mori Yueqiang Hu Guangwei Hu Stefan A maier Haoran Ren Huigao Duan Joel k W Yang College of mechanical and Vehicle Engineering Hunan UniversityChangsha 410082People's Republic of China Engineering Product Development Singapore University of Technology and DesignSingapore 487372Singapore Greater Bay Area Institute for Innovation Hunan UniversityGuangzhou 511300People's Republic of China department of Electrical and computer Engineering National University of Singapore4 Engineering Drive 3Singapore 117576Singapore School of Physics and Astronomy Faculty of ScienceMonash UniversityMelbourneVictoria 3800Australia Leibniz Institute of Photonic technology 07745 JenaGermany ab.e Center of Photonics and Faculty of Physics FSU Jena07745 JenaGermany Otto Schott Institute of material Research FSU Jena07745 JenaGermany Institute of materials Research and Engineering A*STAR(Agency for Science Technology and Research)Singapore 138634Singapore Industrial technology Center of Wakayama Prefecture Wakayama 6496261Japan School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore639798Singapore department of Physics Imperial College LondonLondon SW72AZUnited Kingdom

Optical imaging systems have greatly extended human visual capab.lities,enab.ing the observation and understanding of diverse *** technologies span a broad spectrum of wavelengths from x-ray to radio frequencies and impact research activities and our daily *** glass lenses are fab.icated through a series of complex processes,while polymers offer versatility and ease of ***,modern applications often require complex lens assemblies,driving the need for miniaturization and advanced designs with micro-and nanoscale features to surpass the capab.lities of traditional fab.ication ***-dimensional(3D)printing,or additive manufacturing,presents a solution to these challenges with benefits of rapid prototyping,customized geometries,and efficient production,particularly suited for miniaturized optical imaging *** 3D printing methods have demonstrated advantages over traditional counterparts,yet challenges remain in achieving nanoscale ***-photon polymerization lithography(tPL),a nanoscale 3D printing technique,enab.es the fab.ication of intricate structures beyond the optical diffraction limit via the nonlinear process of two-photon ab.orption within liquid *** offers unprecedented ab.lities,***-free fab.ication,micro-and nanoscale capab.lities,and rapid prototyping of almost arbitrary complex 3D *** this review,we emphasize the importance of the criteria for optical performance evaluation of imaging devices,discuss material properties relevant to tPL,fab.ication techniques,and highlight the application of tPL in optical *** the first panoramic review on this topic,it will equip researchers with foundational knowledge and recent advancements of tPL for imaging optics,promoting a deeper understanding of the *** leveraging on its high-resolution capab.lity,extensive material range,and true 3D processing,alongside advances in materials,fab.ication,and design,we en

关键词： two-photon polymerization lithography 3D printing additive manufacturing imaging optics and nanophotonics

维普期刊数据库

An Adjusted Gray map technique for Constructing Large Four-Level Uniform Designs

在线全文

学校读者我要写书评

暂无评论

Journal of Systems science & Complexity 2023年第1期36卷 433-456页

作者： ELSAWAH A m VISHWAkARmA G k mOHAmED H S FANG kai-tai department of Statistics and Data science Faculty of Science and TechnologyBeijing Normal University-Hong Kong Baptist University United International CollegeZhuhai 519087China Guangdong Provincial key Lab.ratory of Interdisciplinary Research and Application for Data science BNU-HKBU United International CollegeZhuhai 519087China department of mathematics Faculty of ScienceZagazig UniversityZagazig 44519Egypt department of mathematics&Computing Indian Institute of Technology DhanbadDhanbad 826004India College of transportation and Civil Engineering Fujian Agriculture and Forestry UniversityFuzhou 350002China the key Lab.of Random Complex Structures and Data Analysis The Chinese Academy of SciencesBeijing 100190China

A uniform experimental design(UED)is an extremely used powerful and efficient methodology for designing experiments with high-dimensional inputs,limited resources and unknown underlying models.A UED enjoys the following two significant advantages:(i)It is a robust design,since it does not require to specify a model before experimenters conduct their experiments;and(ii)it provides uniformly scatter design points in the experimental domain,thus it gives a good representation of this domain with fewer experimental trials(runs).many real-life experiments involve hundreds or thousands of active factors and thus large UEDs are *** large UEDs using the existing techniques is an NP-hard problem,an extremely time-consuming heuristic search process and a satisfactory result is not *** paper presents a new effective and easy technique,adjusted Gray map technique(AGmt),for constructing(nearly)UEDs with large numbers of four-level factors and runs by converting designs with s two-level factors and n runs to(nearly)UEDs with 2^(t−1)s four-level factors and 2tn runs for any t≥0 using two simple transformation *** justifications for the uniformity of the resulting four-level designs are given,which provide some necessary and/or sufficient conditions for obtaining(nearly)uniform four-level *** results show that the AGmt is much easier and better than the existing widely used techniques and it can be effectively used to simply generate new recommended large(nearly)UEDs with four-level factors.

关键词： ab.rration adjusted Gray map technique Gray map technique Hamming distance moment ab.rration threshold accepting algorithm uniform design

维普期刊数据库

Design and Analysis of an Outer-Rotor Parallel-Hybrid-Excited Vernier machine

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electrical Engineering 2017年第1期3卷 27-32页

作者： Wenlong Li t.W.Ching k.t.Chau College of computer science and Software Engineering Shenzhen UniversityShenzhen518060China Faculty of science and technology University of MacaoMacao999078China department of Electrical and Electronic Engineering The University of Hong KongHong KongChina

In this paper,an outer-rotor parallel-hybrid-excited vernier machine is *** order to realize the parallel hybrid excitation,the homopolar configuration is adopted to artfully combine the permanent magnet(Pm)flux path and the electromagnet flux path ***,the structure of the proposed machine is ***,its operating principle is studied and ***,its performance for flux regulation is analyzed based on the 3-D finite element ***,the prototype of the proposed machine is manufactured and tested to verify the analytical results.

关键词： Flux control parallel hybrid excitation Pm machine vernier machine

kinetic monte Carlo Simulation of metallic Nanoislands Grown by Physical Vapor Deposition

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Computational Physics 2011年第1期9卷 49-67页

作者： ab.hanif k.Bhuiyan S.k.Dew m.Stepanova department of Electrical and computer Engineering University of AlbertaEdmontonAlbertaCanada T6G 2V4 National Institute for Nanotechnology NRC EdmontonAlbertaCanada T6G 2M9.

We report kinetic monte-karlo(kmC)simulation of self-assembled synthesis of nanocrystals by physical vapor deposition(PVD),which is one of most flexible,efficient,and clean techniques to fab.icate *** particular,self-assembled arrays of nanocrystals can be synthesized by *** size,shape and density of self-assembled nanocrystals are highly sensitive to the process conditions such as duration of deposition,temperature,substrate material,*** efficiently synthesize nanocrystalline arrays by PVD,the process control factors should be understood in *** simulations of film deposition are an important tool for understanding the mechanisms of film *** this paper,we report a kmC modeling that explicitly represents PVD synthesis of self-assembled *** study how varying critical process parameters such as deposition rate,duration,temperature,and substrate type affect the lateral 2D morphologies of self-assembled metallic islands on substrates,and compare our results with experimentally observed surface morphologies generated by *** simulations align well with experimental results reported in the literature.

关键词： kinetic monte Carlo Simulation(kmC) nanocrystals nanotechnology

A Finite Difference method for Space Fractional Differential Equations with Variab.e Diffusivity Coefficient

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications on Applied mathematics and Computation 2020年第4期2卷 671-688页

作者： k.A.mustapha k.m.Furati O.m.knio O.P.Le maître department of mathematics and Statistics King Fahd University of Petroleum and MineralsDhahran 31261Kingdom of Saudi Arabia computer ElectricalMathermatical Sciences and Engineering DivisionKing Abdullah University of Science and TechnologyThuwal 23955Kingdom of Saudi Arabia CNRS LIMSIUniversitéParis-SaclayCampus Universitaire-BP 13391403 OrsayFrance

Anomalous diffusion is a phenomenon that cannot be modeled accurately by second-order diffusion equations,but is better described by fractional diffusion *** nonlocal nature of the fractional diffusion operators makes substantially more difficult the mathemati-cal analysis of these models and the estab.ishment of suitab.e numerical *** paper proposes and analyzes the first finite difference method for solving variab.e-coefficient one-dimensional(steady state)fractional differential equations(DEs)with two-sided fractional derivatives(FDs).the proposed scheme combines first-order forward and backward Euler methods for approximating the left-sided FD when the right-sided FD is approximated by two consecutive applications of the first-order backward Euler *** scheme reduces to the standard second-order central difference in the ab.ence of *** existence and uniqueness of the numerical solution are proved,and truncation errors of order h are demonstrated(h denotes the maximum space step size).the numerical tests illustrate the global 0(h)accu-racy,except for nonsmooth cases which,as expected,have deteriorated convergence rates.

关键词： two-sided fractional derivatives Variab.e coefcients Finite diferences