检索结果-南通市图书馆

Vertically Aligned Silicon Carbide Nanowires/Boron Nitride Cellulose Aerogel Networks Enhanced Thermal Conductivity and Electromagnetic Absorbing of Epoxy Composites

引用

Nano-Micro Letters 2022年第7期14卷 209-227页

作者： Duo Pan Gui Yang Hala MAbo-Dief Jingwen Dong Fengmei Su Chuntai Liu Yifan Li Ben Bin Xu Vignesh Murugadoss Nithesh Naik salah mel-bahy Zeinhom mel-bahy Minan Huang Zhanhu Guo Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationNational Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou 450002People’s Republic of China Department of Chemistry College of ScienceTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia Mechanical and Construction Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle upon Tyne NE18STUK Integrated Composites Laboratory(ICL) Department of Chemical and Biomolecular EngineeringUniversity of TennesseeKnoxvilleTN 37996USA Advanced Materials Division Engineered Multifunctional Composites(EMC)Nanotech LLCKnoxvilleTN 37934USA College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024People’s Republic of China Department of Mechanical and Manufacturing Engineering Manipal Institute of TechnologyManipal Academy of Higher EducationManipalKarnataka 576104India Department of Chemistry Turabah University CollegeTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia Department of Chemistry Al-Azhar UniversityNasr CityCairo 11884Egypt

With the innovation of microelectronics technology, the heat dissipation problem inside the device will face a severe test. In this work, cellulose aerogel(CA) with highly enhanced thermal conductivity(TC) in vertical planes was successfully obtained by constructing a vertically aligned silicon carbide nanowires(SiC NWs)/boron nitride(BN) network via the ice template-assisted strategy. The unique network structure of SiC NWs connected to BN ensures that the TC of the composite in the vertical direction reaches 2.21 W m^(-1) K^(-1) at a low hybrid filler loading of 16.69 wt%, which was increased by 890% compared to pure epoxy(EP). In addition, relying on unique porous network structure of CA, EP-based composite also showed higher TC than other comparative samples in the horizontal direction. Meanwhile, the composite exhibits good electrically insulating with a volume electrical resistivity about 2.35 × 10^(11) Ω cm and displays excellent electromagnetic wave absorption performance with a minimum reflection loss of-21.5 dB and a wide effective absorption bandwidth(<-10 dB) from 8.8 to 11.6 GHz. Therefore, this work provides a new strategy for manufacturing polymer-based composites with excellent multifunctional performances in microelectronic packaging applications.

关键词： Epoxy Ice template Vertical alignment Thermal conductivity Multifunctionality

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

One-pot hydrothermal preparation of hierarchical manganese oxide nanorods for high-performance symmetric supercapacitors

引用

Journal of Energy Chemistry 2022年第2期31卷 116-126页

作者： Bidhan Pandit Emad S.Goda Mahmoud H.Abu Elella Aafaq ur Rehman Sang Eun Hong Sachin R.Rondiya Pranay Barkataki Shoyebmohamad F.Shaikh Abdullah M.Al-Enizi salah mel-bahy Kuk Ro Yoon Department of Materials Science and Engineering and Chemical Engineering Universidad Carlos III de MadridAvenida de la Universidad 3028911 LeganésMadridSpain Organic Nanomaterials Lab Department of ChemistryHannam UniversityDaejeon 34054Republic of Korea Fire Protection Laboratory National Institute of Standards136Giza 12211Egypt Chemistry Department Faculty of ScienceCairo UniversityGiza 12613Egypt Graduate School of Energy Science and Technology Chungnam National University99 Daehak-roYuseong-guDaejeon 34134Republic of Korea School of Chemistry Cardiff UniversityMain BuildingPark PlaceCardiffCF103AT WalesUnited Kingdom Department of Physics Visvesvaraya National Institute of TechnologySouth Ambazari RoadNagpur-440010MaharashtraIndia Department of Chemistry College of ScienceKing Saud UniversityP.O.Box 2455Riyadh 11451Saudi Arabia Department of Chemistry Turabah University CollegeTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia

An eco-friendly,new,and controllable approach for the preparation of manganese oxide(a-MnO_(2))nanorods has been introduced using hydrothermal reaction for supercapacitor *** in-depth crystal structure analysis ofα-MnO_(2) is analyzed by X-ray Rietveld refinement by using Full Prof program with the help of pseudo-Voigt profile *** developed a-MnO_(2) electrode attains a remarkable capacitance of 577.7 F/g recorded at a current density value of 1 A/g with an excellent cycle life when is used for 10,000 repeated cycles due to the porous nanorod-morphology assisting the ease penetration of electrolyte ions into the electroactive *** diffusive and capacitive contributions of the electrode have been estimated by considering standard numerical packages in *** successfully assembling the aqueous symmetric supercapacitor(SSC)cell by utilizing the as-preparedα-MnO_(2),an excellent capacitance of 163.5 F/g and energy density of 58.1 Wh/kg at the constant current density of 0.5 A/g are obtained with an expanded potential frame of 1.6 ***,the cell has exceptionally withstood up to 10,000 cycles with an ultimate capacitance retention of 94.1%including the ability to light an LED for 18 *** findings recommend the developed a-MnO_(2) electrode to be a highly felicitous electrode for the field of energy storage.

关键词： α-MnO_(2)nanorods Rietveld refinement Symmetrical supercapacitors High energy density

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

CO oxidation and 4-nitrophenol reduction over ceria-promoted platinum nanoparticles impregnated with ZSM-5 zeolite

引用

Journal of Rare Earths 2022年第8期40卷 1247-1254页

作者： Zeinhom M.El-bahy Mohammed T.Alotaibi salah M.El-bahy Department of Chemistry Faculty of ScienceAl-Azhar UniversityNasr City11884CairoEgypt Department of Chemistry Turabah University CollegeTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia

Active new ceria-promoted platinum supported on ZSM-5 catalysts were prepared and characterized by X-ray diffraction(XRD),Fourier transform infrared spectra(FTIR),transform electron microscopy(TEM),temperature programmed desorption(TPD),and FTIR of CO *** samples were prepared by the incipient wetness impregnation method and calcined at 500℃.The XRD patterns and FTIR spectra prove that the zeolite framework is kept unaltered after metal *** images prove the presence of Pt nanoparticles with particle size starting from 14 to 27 *** FTIR data suggest the formation of Pt-O-Ce ***-situ FTIR of CO adsorption over reduced samples proves the presence of Pt~0 only,and no Pt^(n+)-CO species are *** prepared catalysts were tested in both oxidation reaction(CO oxidation) in the gas phase and in reduction reaction(4-nitrophenol reduction) in the aqueous ***,CO oxidation by O_(2) results in the formation of a CO_(2) peak at 2347 cm^(-1) as the only CO oxidation product in the studied frequency *** intensity of the CO_(2) peak increases after the addition of Ce,and it is 4 times higher in Pt_(1) Ce_(0.5)ZSM-5 than that in the Ce-free *** to the FTIR data and previous reports,the increase in the catalytic activity may be due to the formation of Pt-O-Ce ***,Ce-promoted Pt_(1) ZSM5 also exhibits enhanced catalytic activity towards the reduction of 4-nitrophenol to 4-aminophenol by NaBH_(4) in the aqueous *** first-order rate constant of the reduction increases ≈13 times after incorporating equal ratios of Pt and Ce(Pt_(1) Ce_(1)ZSM-5),and the activation energy(E_(a)) decreases to 40% of that in the reaction over Pt_(1) ZSM-5.

关键词： 4-Nitrophenol CO oxidation TPD-CO Platinum-cerium ZSM-5 Rare earths

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

Facial synthesis of carbon nanotube interweaved FeOOH as chloride-insertion electrode for highly efficient faradic capacitive deionization

引用

Progress in Natural Science:Materials International 2024年第4期34卷 731-738页

作者： Lu Zhang Harry Lye Hin Chong Dan Luo salah M.El-bahy Pak Yan Moh Xingtao Xu Zeinhom M.El-bahy Environmental Science Programme Faculty of Science and Natural Resources Universiti Malaysia Sabah Water Research Unit Faculty of Science and Natural Resources Universiti Malaysia Sabah Marine Science and Technology College Zhejiang Ocean University Department of Chemistry Turabah University College Taif University Department of Chemistry Faculty of Science Al-Azhar University

Faradic-based capacitive deionization（FDI） has been widely acknowledged as one of the most promising desalination techniques to solve the freshwater crisis, yet was largely limited by heavily trailed development of its anode materials, which subsequently hindered its desalination performance in terms of both desalination capacity and stability. Herein, we developed a new type of anode material for FDI by coupling chloride-insertion FeOOH with carbon nanotubes（CNTs@FeOOH）. The essence of this study lay in the composition of FeOOH with CNTs that could not only facilitate charge/electron transfer but also prevent structural aggregation. Consequently, the CNTs@FeOOH-based FDI system displays excellent desalination performance(desalination capacity: 50.36 mg g-1; desalination rate: 0.41 mg g-1s-1) with robust long-term stability（13.86 % reduction over 80 cycles）, which could motivate the future development of other highly-efficient desalination systems.

关键词： Capacitive deionization Carbon nanotube Faradic capacitive deionization FeOOH

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

The Spectrum of a Rational Function

引用

Algebra Colloquium 2020年第3期27卷 477-482页

作者： salah Najib Laboratoire ATRES Faculte Polydisciplinaire de Khouribga Universite Sultan Moulay Slimane BP.145Hay EzzaytouneKhouribgaMorocco

Let k be an infinite field,A be a finite set of k,and Q∈k[x](with x=(x_(1),...,X_(n))and n≥2)be a noncons taut *** main goal of this paper is to construct a polynomial P(x)∈k[x]with suitably large partial degrees i... 详细信息

关键词： irreducible and indecomposable polynomial spectrum of rational function field with product formula Hilbert subset

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

On Two Natural Extensions of n-normality

引用

Acta Mathematica Sinica,English Series 2023年第6期39卷 1147-1152页

作者： salah MECHERI Faculty of Mathematics and informatics Mohamed El Bachir El Ibrahimi UniversityBordj Bou ArreridjAlgeria

A bounded linear operator T on a complex Hilbert space H is called n-normal if T^(*)T^(n)=T^(n)T^(*).By Fuglede’s theorem T is n-normal if and only if T^(n)is *** k,n∈*** a bounded linear operator T is said to be of typeⅠk-quasi-n-normal if T^(*k){T^(*)T^(n)-T^(n)T^(*)}T^(k)=0,and T is said to be of typeⅡk-quasi-n-normal if T^(*k){T^(*n)T^(n)-T^(n)T^(*n)}T^(k)=0.1-quasi-n-normal is called *** shall show that(1)typeⅠquasi-2-normal and typeⅡquasi-2-normal are different classes;(2)the intersection of the class of typeⅠquasi-2-normal and the class of typeⅡquasi-2-normal is equal to the class of *** also give some examples of type I k-quasi-n-normal and typeⅡ*** also show that Weyl’s theorem holds for this class of operators and every k-quasi-n-normal operator has a non trivial invariant subspace.

关键词： Normal operator n-normal operator invariant subspace

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

RIESZ IDEMPOTENT AND BROWDER'S THEOREM FOR ABSOLUTE-(p,r)-PARANORMAL OPERATORS

引用

Acta Mathematica Scientia 2012年第6期32卷 2259-2264页

作者： salah Mecheri Department of Mathematics College of ScienceTaibah UniversityP.O.Box 30002Al Madinah Al MunawarahSaudi Arabia

An operator T is said to be paranormal if ｜｜T^2 x ｜｜〉｜｜Tx｜｜^2 holds for every unit vector x. Several extensions of paranormal operators are considered until now, for example absolute-k-paranormal and p-paranormal introduced in [10], [14], respectively. Yamazaki and Yanagida [38] introduced the class of absolute-（p, r）-paranormal operators as a further generalization of the classes of both absolute-k-paranormal and p-paranormal operators. An operator T ∈ B（H） is called absolute-（p, r）-paranormal operator if ｜｜｜T｜p｜T^＊｜^rx｜｜^r 〉｜｜｜T^＊｜^rx｜｜p＋r for every unit vector x ∈ H and for positive real numbers p 〉 0 and r 〉 0. The famous result of Browder, that self adjoint operators satisfy Browder＇s theorem, is extended to several classes of operators. In this paper we show that for any absolute-（p, r）- paranormal operator T, T satisfies Browder＇s theorem and a-Browder＇s theorem. It is also shown that if E is the Riesz idempotent for a nonzero isolated point μ of the spectrum of a absolute-（p, r）-paranormal operator T, then E is self-adjoint if and only if the null space of T -μ, N（T - μ） N（T^＊ - ^μ）.

关键词： absolute-(p, r)-paranormal operator Browder's theorem Weyl's spectrum

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

Optimised CNN Architectures for Handwritten Arabic Character Recognition

引用

Computers, Materials & Continua 2024年第6期79卷 4905-4924页

作者： salah Alghyaline Department of Computer Science TheWorld Islamic Sciences and Education UniversityAmman1101-11947Jordan

Handwritten character recognition is considered challenging compared with machine-printed characters due to the different human writing *** is morphologically rich,and its characters have a high *** Arabic language includes 28 *** character has up to four shapes according to its location in the word(at the beginning,middle,end,and isolated).This paper proposed 12 CNN architectures for recognizing handwritten Arabic *** proposed architectures were derived from the popular CNN architectures,such as VGG,ResNet,and Inception,to make them applicable to recognizing character-size *** experimental results on three well-known datasets showed that the proposed architectures significantly enhanced the recognition rate compared to the baseline *** experiments showed that data augmentation improved the models’accuracies on all tested *** proposed model outperformed most of the existing *** best achieved results were 93.05%,98.30%,and 96.88%on the HIJJA,AHCD,and AIA9K datasets.

关键词： Optical character recognition(OCR) handwritten arabic characters deep learning

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

Arabic Optical Character Recognition:A Review

引用

Computer Modeling in Engineering & Sciences 2023年第6期135卷 1825-1861页

作者： salah Alghyaline Computer Science Department TheWorld Islamic Sciences and Education UniversityAmman1101-11947Jordan

This study aims to review the latest contributions in Arabic Optical Character Recognition(OCR)during the last decade,which helps interested researchers know the existing techniques and extend or adapt them *** study describes the characteristics of the Arabic language,different types of OCR systems,different stages of the Arabic OCR system,the researcher’s contributions in each step,and the evaluationmetrics for *** study reviews the existing datasets for the Arabic OCR and their ***,this study implemented some preprocessing and segmentation stages of Arabic *** study compares the performance of the existing methods in terms of recognition *** addition to researchers’OCRmethods,commercial and open-source systems are used in the *** Arabic language is morphologically rich and written cursive with dots and diacritics above and under the *** of the existing approaches in the literature were evaluated on isolated characters or isolated words under a controlled environment,and few approaches were tested on pagelevel *** comparative studies show that the accuracy of the existing Arabic OCR commercial systems is low,under 75%for printed text,and further improvement is ***,most of the current approaches are offline OCR systems,and there is no remarkable contribution to online OCR systems.

关键词： Arabic Optical Character Recognition(OCR) Arabic OCR software Arabic OCR datasets Arabic OCR evaluation

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

Constraints on the crustal structure beneath the Sinai subplate,SE Mediterranean,from analysis of local and regional travel times

引用

Geoscience Frontiers 2013年第2期4卷 213-222页

作者： Mohamed K.salah Geology Department Faculty of ScienceTanta UniversityTanta 31527Egypt

The Sinai Peninsula has been recognized as a subplate of the African Plate located at the triple junction of the Gulf of Suez rift,the Dead Sea Transform fault,and the Red Sea *** upper and lower crustal structures of this tectonically active,rapidly developing region are yet poorly understood because of many *** this reason,a set of P- and S-wave travel times recorded at 14 seismic stations belonging to the Egyptian National Seismographic Network（ENSN） from 111 local and regional events are analyzed to investigate the crustal structures and the locations of the seismogenic zones beneath central and southern *** the velocity model used for routine earthquake location by ENSN is one-dimensional,the travel-time residuals will show lateral heterogeneity of the velocity structures and unmodeled vertical *** activity is strong along the eastern and southern borders of the study area but low to moderate along the northern boundary and the Gulf of Suez to the *** crustal V_P/V_S ratio is 1.74 from shallow（depth≤10 km） earthquakes and 1.76 from deeper（depth 〉 10 km） crustal *** majority of the regional and local travel-time residuals are positive relative to the Preliminary Reference Earth Model（PREM）,implying that the seismic stations are located above widely distributed,tectonically-induced low-velocity *** low-velocity zones are mostly related to the local crustal faults affecting the sedimentary section and the basement complex as well as the rifting processes prevailing in the northern Red Sea region and the ascending of hot mantle materials along crustal *** delineation of these low-velocity zones and the locations of big crustal earthquakes enable the identification of areas prone to intense seismotectonic activities,which should be excluded from major future development projects and large constructions in central and southern Sinai.

关键词： Crustal structure Sinai Peninsula SE Mediterranean Seismicity Travel-time residuals(TTRs) Crustal V_P/V_S ratio

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

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：