检索结果-南通市图书馆

Multifunctional characteristics of 3D printed polymer nanocomposites under monotonic and cyclic compression

Defence Technology（防务技术） 2023年第12期30卷 13-22页

作者： Pawan Verma Jabir Ubaid Fahad Alam suleyman Deveci s.kumar Department of Mechanical Engineering Khalifa University of Science and TechnologyMasdar InstituteMasdar CityP.O.Box 54224Abu DhabiUnited Arab Emirates Borouge Pte.Ltd. Innovation CentreSas Al Nakhl6951Abu DhabiUnited Arab Emirates James Watt school of Engineering University of GlasgowGlasgowG128QQUK

This study presents the multifunctional characteristics of multi-walled carbon nanotube(MWCNT)/polypropylene random copolymer(PPR) composites enabled via fused filament fabrication(FFF) under monotonic and quasi-static cyclic compression. Utilizing in-house MWCNT-engineered PPR filament feedstocks, both bulk and cellular composites were realized. The morphological features of nanocomposites were examined via scanning electron microscopy, which reveals that MWCNTs are uniformly dispersed. The uniformly dispersed MWCNTs forms an electrically conductive network within the PPR matrix, and the resulting nanocomposite shows good electrical conductivity(~10^(-1)s/cm), improved mechanical performance(modulus increases by 125% and compressive strength increases by 25% for 8 wt% MWCNT loading) and pronounced piezoresistive response(gauge factor of 27.9-8.5 for bulk samples)under compression. The influence of strain rate on the piezoresistive response of bulk samples(4 wt% of MWCNT) under compression was also measured. Under repeated cyclic compression(2% constant strain amplitude), the nanocomposite exhibited stable piezoresistive performance up to 100 cycles. The piezoresistive response under repeated cyclic loading with increasing strain amplitude of was also *** gauge factor of BCC and FCC cellular composites(4 wt% of MWCNT) with a relative density of 30%was observed to be 46.4 and 30.2 respectively, under compression. The higher sensitivity of the BCC plate-lattice could be attributed to its higher degree of stretching-dominated deformation behavior than the FCC plate-lattice, which exhibits bending-dominated behavior. The 3D printed cellular PPR/MWCNT composites structures were found to show excellent piezoresistive self-sensing characteristics and open new avenues for in situ structural health monitoring in various applications.

关键词： Carbon nanotubes Nanoengineered polymer composites 3D printing Piezoresistive self-sensing Lattice structures

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Evolutionary Algorithm Based Feature subset selection for students Academic Performance Analysis

引用

Intelligent Automation & soft Computing 2023年第6期36卷 3621-3636页

作者： Ierin Babu R.Mathusoothana s.kumar Department of Computer science and Engineering Noorul Islam Centre for Higher EducationKanyakumari629180India Department of Information Technology Noorul Islam Centre for Higher EducationKanyakumari629180India

Educational Data Mining(EDM)is an emergent discipline that concen-trates on the design of self-learning and adaptive *** education institutions have started to utilize analytical tools to improve students’grades and *** of students’performance is a difficult process owing to the massive quantity of educational ***,Artificial Intelligence(AI)techniques can be used for educational data mining in a big data *** the same time,in EDM,the feature selection process becomes necessary in creation of feature *** the feature selection performance affects the predictive performance of any model,it is important to elaborately investigate the outcome of students’performance model related to the feature selection *** this motivation,this paper presents a new Metaheuristic Optimiza-tion-based Feature subset selection with an Optimal Deep Learning model(MOFss-ODL)for predicting students’*** addition,the proposed model uses an isolation forest-based outlier detection approach to eliminate the existence of ***,the Chaotic Monarch Butterfly Optimization Algo-rithm(CBOA)is used for the selection of highly related features with low com-plexity and high ***,a sailfish optimizer with stacked sparse autoencoder(sFO-ssAE)approach is utilized for the classification of educational *** MOFss-ODL model is tested against a benchmark student’s perfor-mance data set from the UCI repository.A wide-ranging simulation analysis por-trayed the improved predictive performance of the MOFss-ODL technique over recent approaches in terms of different *** to other methods,experimental results prove that the proposed(MOFss-ODL)classification model does a great job of predicting students’academic progress,with an accuracy of 96.49%.

关键词： students’performance analysis educational data mining feature selection deep learning metaheuristics outlier detection

来源：

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

Advances in nanotechnology application in biosafety materials: A crucial response to COVID-19 pandemic

引用

Biosafety and Health 2022年第5期4卷 347-363页

作者： Rasmi V.Morajkar Akhil s.kumar Rohan K.Kunkalekar Amit A.Vernekar Inorganic and Physical Chemistry Laboratory Council of Scientific and Industrial Research(CSIR)-Central Leather Research Institute(CLRI)AdyarChennai 600020Tamil NaduIndia school of Chemical sciences Goa UniversityTaleigao Plateau 403206GoaIndia

The outbreak of coronavirus disease 2019(COVID-19)has adversely affected the public domain causing unprecedented cases and high mortality across the *** has brought back the concept of biosafety into the spotlight to solve biosafety problems in developing diagnostics and therapeutics to treat *** advances in nanotechnology and material science in combination with medicinal chemistry have provided a new perspective to overcome this ***,we discuss the efforts of researchers in the field of material science in developing personal protective equipment(PPE),detection devices,vaccines,drug delivery systems,and medical *** a synergistic approach of disciplines can strengthen the research to develop biosafety products in solving biosafety problems.

关键词： COVID-19 sARs-CoV-2 Biosafety Nanomaterials Diagnostics Therapeutics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Research highlights from the status report for step it up! The surgeon general's call to action to promote walking and walkable communities

引用

Journal of sport and Health science 2018年第1期7卷 5-6页

作者： David R.Brown susan A.Carlson Gayathri s.kumar Janet E.Fulton National Center for Chronic Disease Prevention and Health Promotion Centers for Disease Control and Prevention Division of NutritionPhysical Activity and Obesity Physical Activity and Health Branch

In september 2015,the Office of the surgeon General,*** of Health and Human services,released step it up!The surgeon general’s call to action to promote walking and walkable communities(Call to Action)to increase walking among people across the UsA.1The Call to Action also recognized that walkable communities can accommodate wheelchair rolling and are inclusive of persons with *** status Report for the Call to Action was released in 2017。

关键词：电话医生外科社区办公室

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Evolution of PEO coatings on AM50 magnesium alloy using phosphate-based electrolyte with and without glycerol and its electrochemical characterization

引用

Journal of Magnesium and Alloys 2020年第3期8卷 692-715页

作者： Ashutosh Jangde s.kumar C.Blawert Department of Materials Engineering Indian Institute of ScienceBangalore 560012India Institute of Materials Research Helmholtz-Zentrum GeesthachtMax-Planck-Str.121502 GeesthachtGermany

PEO coatings were synthesized from phosphate-based (bP-PEO) and glycerol added phosphate-based (gP-PEO) electrolytes with differentprocessing times. For both bP-PEO and gP-PEO coatings treated with different processing time its morphology, elemental and phase composition,and electrochemical behaviour has been comparatively investigated. For this, scanning electron microscope (sEM), energy-dispersiveX-ray spectroscopy (EDXs), X-ray diffraction, electrochemical impedance spectroscopy (EIs), and potentiodynamic polarization techniqueswere employed. The gP-PEO coatings were observed to have higher pore density with reduced pores size, surface porosity, and averagecoating thickness compared to bP-PEO for all the PEO processing time. XRD studies revealed that glycerol addition resulted in the fosteringof crystalline MgO (periclase) phase and promoting Mg3(PO4)2 (farringtonite) phase amorphization. In general, electrochemical behaviourshowed improved corrosion behaviour for gP-PEO compared to bP-PEO.

关键词： Magnesium alloy Plasma electrolytic oxidation Glycerol additive Electrochemical impedance spectroscopy Corrosion.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Optimal Feature Extraction Using Greedy Approach for Random Image Components and subspace Approach in Face Recognition

引用

Journal of Computer science & Technology 2013年第2期28卷 322-328页

作者： Mathu soothana s.kumar Retna swami Muneeswaran Karuppiah Department of Information Technology Noorul Islam University Department of Computer science and Engineering Mepco Schlenk Engineering College

An innovative and uniform framework based on a combination of Gabor wavelets with principal component analysis （PCA） and multiple discriminant analysis （MDA） is presented in this paper. In this framework, features are extracted from the optimal random image components using greedy approach. These feature vectors are then projected to subspaces for dimensionality reduction which is used for solving linear problems. The design of Gabor filters, PCA and MDA are crucial processes used for facial feature extraction. The FERET, ORL and YALE face databases are used to generate the results. Experiments show that optimal random image component selection （ORICs） plus MDA outperforms ORICs and subspace projection approach such as ORICs plus PCA. Our method achieves 96.25%, 99.44% and 100% recognition accuracy on the FERET, ORL and YALE databases for 30% training respectively. This is a considerably improved performance compared with other standard methodologies described in the literature.

关键词： face recognition multiple discriminant analysis optimal random image component selection principal com- ponent analysis recognition accuracy

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Preparation and bioactivity of siO_2 functional films on titanium by PACVD

引用

中国有色金属学会会刊：英文版 2008年第3期18卷 627-630页

作者：程晓敏聂邦民 s.kumar school of Materials science and Engineering Wuhan University of Technology Ian Wark Research Institute University of South AustraliaNorth Terrace

siO2 functional films were deposited on the surface of titanium by plasma assisted chemical vapour deposition(PACVD) and the composition of films was studied by XPs. samples deposited with siO2 films were immersed in different concentration simulated body fluid(sBF) for biomimetic deposition of hydroxyapatite(HA). The results show that siO2 functional films deposited on titanium surface with PACVD have good bioactivity. Hydroxyapatite is formed while titanium coated with siO2 is immersed in simulated body fluid for seven days.

关键词：钛二氧化硅薄膜生物活性化学蒸汽沉积

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Numerical and analytical investigations of thermosolutal instability in rotating Rivlin-Ericksen fluid in porous medium with Hall current

引用

Applied Mathematics and Mechanics(English Edition) 2013年第4期34卷 501-522页

作者： s.kumar V.sHARMA K.KIsHOR Department of Mathematics Government College Department of Mathematics Himachal Pradesh University Department of Mathematics Government Senior Secondary School

Numerical and analytical investigations of the thermosolutal instability in a viscoelastic Rivlin-Ericksen fluid are carried out in the presence of a uniform vertical magnetic field to include the Hall current with a uniform angular velocity in a porous medium. For stationary convection, the stable solute gradient parameter and the rota- tion have stabilizing effects on the system, whereas the magnetic field and the medium permeability have stabilizing or destabilizing effects on the system under certain condi- tions. The Hall current in the presence of rotation has stabilizing effects for sufficiently large Taylor numbers, whereas in the absence of rotation, the Hall current always has destabilizing effects. These effects have also been shown graphically. The viscoelastic effects disappear for stationary convection. The stable solute parameter, the rotation, the medium permeability, the magnetic field parameter, the Hall current, and the vis- coelasticity introduce oscillatory modes into the system, which are non-existent in their absence. The sufficient conditions for the non-existence of overstability are also obtained.

关键词： magnetic field thermosolutal instability Rivlin-Ericksen rotating fluid Hall current porous medium

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

stock Market Trading Based on Market sentiments and Reinforcement Learning

引用

Computers, Materials & Continua 2022年第1期70卷 935-950页

作者： K.M.Ameen suhail syam sankar Ashok s.kumar Tsafack Nestor Naglaa F.soliman Abeer D.Algarni Walid El-shafai Fathi E.Abd El-samie Department of Computer science&Engineering NSS College of EngineeringPalakkad678008KeralaIndia Department of Electronics and Communication Engineering NSS College of EngineeringPalakkad678008KeralaIndia Unitéde Recherche de Matière Condensée D’Electronique et de Traitement du Signal(URAMACETS)Department of PhysicsUniversity of DschangP.O.Box 67DschangCameroon Department of Information Technology College of Computer and Information SciencesPrincess Nourah Bint Abdulrahman UniversityRiyadh84428Saudi Arabia Department Electronics and Electrical Communications Faculty of Electronic EngineeringMenoufia UniversityMenouf32952Egypt

stock market is a place,where shares of different companies are *** is a collection of buyers’and sellers’*** this digital era,analysis and prediction in the stock market have gained an essential role in shaping today’s *** market analysis can be either fundamental or *** analysis can be performed either with technical indicators or through machine learning *** this paper,we report a system that uses a Reinforcement Learning(RL)network and market sentiments to make decisions about stock market *** system uses sentiment analysis on daily market news to spot trends in stock *** sentiment analysis module generates a unified score as a measure of the daily news about *** score is then fed into the RL module as one of its *** RL section gives decisions in the form of three actions:buy,sell,or *** objective is to maximize long-term future *** have used stock data of Apple from 2006 to 2016 to interpret how sentiments affect *** stock price of any company rises,when significant positive news become available in the public *** results reveal the influence of market sentiments on forecasting of stock prices.

关键词： Deep learning machine learning daily market news reinforcement learning stock market

来源：

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

Transient photoconductivity in a-(se80Te20)100-xAgx（0≤x≤4） thin films

引用

Progress in Natural science:Materials International 2012年第5期22卷 386-391页

作者： D.singh s.kumar R.Thangaraj semiconductors Laboratory Department of PhysicsGuru Nanak Dev UniversityAmritsarPunjab 143005India

Bulk material of(se80Te20)100-xAgx(0≤x≤4) system was prepared by using a conventional melt quenching *** films of a-(se80Te20)100-xAgx(0≤x≤4) were deposited by the vacuum evaporation technique at a base pressure of 10-4 mbar onto well-cleaned glass *** dependence of electrical conductivity in the temperature range of 263-333 K has been *** is increase in the value of conductivity with increase in temperature as well as with Ag *** measurements of intensity dependence of photoconductivity show that the photoconductivity increases with intensity as a power law where the power is found to be between 0.5 and 1.0,representing the continuous distribution of *** and decay of photocurrent with time at room temperature at different light intensities for(se80Te20)98Ag2 thin film samples have also been *** results have been explained on the basis of the Dember voltage and interaction between photoexcited holes and the trapped electrons on the surface.

关键词： Chalcogenides se-Te-Ag system Transient photoconductivity

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：