咨询与建议

限定检索结果

文献类型

  • 33,974 篇 期刊文献
  • 1,845 册 图书
  • 421 篇 学位论文
  • 315 篇 会议
  • 10 篇 报纸
  • 1 篇 多媒体

馆藏范围

  • 35,728 篇 电子文献
  • 860 种 纸本馆藏

日期分布

学科分类号

  • 14,437 篇 医学
    • 12,691 篇 临床医学
    • 616 篇 公共卫生与预防医...
    • 563 篇 中西医结合
    • 416 篇 医学技术(可授医学...
  • 10,367 篇 工学
    • 1,906 篇 材料科学与工程(可...
    • 1,503 篇 化学工程与技术
    • 1,160 篇 计算机科学与技术...
    • 863 篇 电子科学与技术(可...
    • 679 篇 机械工程
    • 610 篇 软件工程
    • 543 篇 动力工程及工程热...
    • 534 篇 控制科学与工程
    • 500 篇 仪器科学与技术
    • 471 篇 地质资源与地质工...
    • 452 篇 环境科学与工程(可...
    • 426 篇 水利工程
    • 422 篇 力学(可授工学、理...
    • 420 篇 电气工程
  • 7,087 篇 理学
    • 1,841 篇 数学
    • 1,636 篇 化学
    • 1,034 篇 物理学
    • 871 篇 生物学
    • 433 篇 地质学
  • 2,348 篇 农学
    • 680 篇 作物学
    • 451 篇 农业资源与环境
  • 1,653 篇 管理学
    • 851 篇 管理科学与工程(可...
    • 407 篇 公共管理
    • 399 篇 工商管理
  • 1,218 篇 经济学
    • 1,038 篇 应用经济学
  • 749 篇 法学
  • 624 篇 教育学
    • 466 篇 教育学
  • 603 篇 文学
  • 264 篇 哲学
  • 228 篇 艺术学
  • 219 篇 历史学
  • 78 篇 军事学

主题

  • 448 篇 and
  • 423 篇 of
  • 260 篇 analysis
  • 194 篇 covid-19
  • 193 篇 cancer
  • 188 篇 患者
  • 152 篇 diabetes
  • 146 篇 美国
  • 142 篇 acid
  • 142 篇 energy
  • 137 篇 temperature
  • 132 篇 water
  • 131 篇 health
  • 110 篇 disease
  • 109 篇 structure
  • 105 篇 performance
  • 100 篇 model
  • 96 篇 time
  • 93 篇 mass
  • 91 篇 method

机构

  • 48 篇 university of ch...
  • 32 篇 department of co...
  • 28 篇 复旦大学
  • 26 篇 东南大学
  • 25 篇 加州大学
  • 24 篇 华中科技大学
  • 24 篇 department of in...
  • 24 篇 department of el...
  • 24 篇 department of in...
  • 24 篇 华北电力大学
  • 22 篇 湖南大学
  • 22 篇 中国科学院大学
  • 22 篇 department of ma...
  • 20 篇 天津大学
  • 16 篇 北京交通大学
  • 16 篇 南京大学
  • 15 篇 laboratory of pl...
  • 15 篇 department of ma...
  • 15 篇 西安交通大学
  • 15 篇 中国科学院大连化...

作者

  • 70 篇 郭战宏
  • 63 篇 mohamed s. el na...
  • 48 篇 李开
  • 47 篇 刘凯
  • 44 篇 abdelwahed motwa...
  • 40 篇 el-sayed m.el-ke...
  • 39 篇 王亭忠
  • 31 篇 高雪莲
  • 30 篇 虎小毅
  • 28 篇 赵天智
  • 25 篇 abu sarwar zaman...
  • 25 篇 mohammed rizwanu...
  • 24 篇 patrick a. ndaki...
  • 24 篇 郭俊
  • 23 篇 崔荣
  • 20 篇 radwa marzouk
  • 19 篇 陈瑜
  • 19 篇 abdelaziz a.abde...
  • 19 篇 manar ahmed hamz...
  • 18 篇 朱国栋

语言

  • 21,350 篇 英文
  • 15,210 篇 中文
  • 1 篇 法文
检索条件"作者=A. El-Ahmed"
36566 条 记 录,以下是1-10 订阅
排序:
Na.osecond pulse a.d dua.-wa.elength Q-switched 1.5 μm fiber la.er using Ma. pha.e Cr2Tia.C2 sa.ura.le a.sorber
收藏 引用
Optoelectronics Letters 2025年 第1期21卷 7-12页
作者: ahmed Sha.ir a.-HITI Hiba.Ha.Sa. Depa.tment of electrica. Engineering Faculty of Engineering University of Anbar Depa.tment of La.er a.d Optoelectronics Engineering University of Technology-Iraq
We demonstra.ed a.new type of Ma. pha.e ma.eria., chromium tita.ium a.uminum ca.bide(Cr2Tia.C2) polymer film, to genera.e a.pa.sively Q-switched erbium-doped fiber la.er(EDFL). The film thickness wa. mea.ured to b... 详细信息
来源: 同方期刊数据库 同方期刊数据库 评论
Enha.cing Sola. Photovolta.c Efficiency:a.Computa.iona. Fluid Dyna.ics a.a.ysis
收藏 引用
Energy Engineering 2025年 第1期122卷 153-166页
作者: Ra.ool Ra. Fa.eed Hussa.nMa.gi Ka.hif ahmed Sudha.a. Kuma.a.sa. Fa.ulty of Mecha.ica. a.d a.tomotive Engineering Universiti Malaysia Pahang Al-Sultan AbdullahPekan26600PahangMalaysia Fa.ulty of Engineering Science&Technology Hamdard UniversityKarachi74600Pakistan electrica. Engineering Depa.tment SUKKUR IBA UniversitySukkur65200Pakistan Berlin School of Business a.d Innova.ion BSBI Faculty of Computer Science and InformaticsBerlin12043Germany a.tomotive Engineering Centre University Malaysia Pahang Al Sultan AbdullahPekan26600PahangMalaysia Centre for Resea.ch in a.va.ced Fluid&Processes(Fluid Centre) Universiti Malaysia Pahang Al-Sultan Abdullah(UMPSA)Paya BesarKuantan26300PahangMalaysia
The growing need for susta.na.le energy solutions,driven by rising energy shorta.es,environmenta. concerns,a.d the depletion of conventiona. energy sources,ha. led to a.significa.t focus on renewa.le *** energy,a.ong ... 详细信息
来源: 维普期刊数据库 维普期刊数据库 评论
Va.cula. endothelia. growth fa.tor:a.double-edged sword in the development of white ma.ter lesions
收藏 引用
Neura. Regenera.ion Resea.ch 2025年 第1期20卷 191-192页
作者: Na.ek Ma.ukja. Da.iel Fulton Zuba.r ahmed WMa.thijs Bla.kesteijn Séba.tien Foulquier Depa.tment of Pha.ma.ology a.d Toxicology Maastricht UniversityMaastrichtThe Netherlands Ca.IM-School for Ca.diova.cula. Disea.es Maastricht UniversityMaastrichtThe Netherlands Neuroscience a.d Ophtha.mology Institute of Inflammation and AgeingUniversity of BirminghamEdgbastonBirminghamUK Centre for Tra.ma.Sciences Resea.ch University of BirminghamEdgbastonBirminghamUK MHeNs-School for Menta. Hea.th a.d Neuroscience Maastricht UniversityMaastrichtThe Netherlands Depa.tment of Neurology Maastricht University Medical CenterMaastrichtThe Netherlands
a. the popula.ion a.es,the burden of a.e-rela.ed disea.es becomes ***,over 55 million people suffer from dementia.worldwide,with a.zheimer’s disea.e being the most common ***,it is becoming clea.er tha. underlying va...
来源: 维普期刊数据库 维普期刊数据库 同方期刊数据库 同方期刊数据库 评论
Review of Techniques for Integra.ing Security in Softwa.e Development Lifecycle
收藏 引用
Computers, Ma.eria.s & Continua 2025年 第1期82卷 139-172页
作者: Ha.sa. Sa.ed Imra. Sha.i Ja.il a.ma. a.na. ahmed Kha. Ta.ir Khursha.d Imra. a.hra. College of electrica. a.d Mecha.ica. Engineering National University of Sciences and Technology(NUST)Rawalpindi46604Pakistan Depa.tment of Computer Science Abasyn University Islamabad CampusIslamabad45510Pakistan Milita.y College of Signa.s National University of Sciences and Technology(NUST)Rawalpindi46600Pakistan Depa.tment of electrica. Engineering Yeungnam UniversityGyeongsan38541Republic of Korea Depa.tment of Informa.ion a.d Communica.ion Engineering Yeungnam UniversityGyeongsan38541Republic of Korea
Softwa.e-rela.ed security a.pects a.e a.growing a.d legitima.e concern,especia.ly with 5G da.a.a.a.la.le just a. our *** conduct resea.ch in this field,periodic compa.a.ive a.a.ysis is needed with the new techniques c... 详细信息
来源: 维普期刊数据库 维普期刊数据库 评论
a.Synergistic Multi-a.tribute Decision-Ma.ing Method for Educa.iona. Institutions Eva.ua.ion Using Simila.ity Mea.ures of Possibility Pytha.orea. Fuzzy Hypersoft Sets
收藏 引用
Computer Modeling in Engineering & Sciences 2025年 第1期142卷 501-530页
作者: Khura. a.i Kha. Sa.a.Mubeen Ishfa. a.iqe Ur Ra.ma. Sa.wa.el-Morsy Depa.tment of Ma.hema.ics University of SargodhaSargodha40100Pakistan Depa.tment of Ma.hema.ics University of Management and TechnologyLahore54000Pakistan Depa.tment of Ma.hema.ics College of ScienceQassim UniversityBuraydah51452Saudi Arabia
Due to the numerous va.ia.les to ta.e into a.count a. well a. the inherent a.biguity a.d uncerta.nty,eva.ua.ing educa.iona. institutions ca. be *** concept of a.possibility Pytha.orea. fuzzy hypersoft set(pPyFHSS)is m... 详细信息
来源: 维普期刊数据库 维普期刊数据库 评论
Dyna.ic Intera.tion a.a.ysis of Coupled a.ia.-Torsiona.-La.era. Mecha.ica. Vibra.ions in Rota.y Drilling Systems
收藏 引用
Structura. Dura.ility & Hea.th Monitoring 2025年 第1期19卷 77-103页
作者: Sa.rina.Medda. Sid ahmed Ta.jer a.delha.im Idir Kong Fa. Tee Moha.ed Zinela.idine Doghma.e Ma.jid Kidouche a.plied a.toma.ion La.ora.ory Faculty of Hydrocarbons and ChemistryUniversity of BoumerdesBoumerdes35000Algeria Institute of electrica. a.d electronic Engineering(IGEE) University of BoumerdesBoumerdes35000Algeria La.ora.ory of the electrifica.ion of Industria. Enterprises University of BoumerdesBoumerdes35000Algeria electrica. Engineering Depa.tment Mohamed Boudiaf University of M’silaM’sila28000Algeria Depa.tment of Civil a.d Environmenta. Engineering King Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia Interdisciplina.y Resea.ch Center for Construction a.d Building Ma.eria.s King Fahd University of Petroleum&Minerals(KFUPM)Dhahran31261Saudi Arabia
Ma.nta.ning the integrity a.d longevity of structures is essentia. in ma.y industries,such a. a.rospa.e,nuclea.,a.d *** a.hieve the cost-effectiveness of la.ge-sca.e systems in petroleum drilling,a.strong empha.is on ... 详细信息
来源: 维普期刊数据库 维普期刊数据库 评论
Solid Wa.te Ma.a.ement:a.Ma.M a.proa.h Using Fuzzy Pa.a.eterized Possibility Single-Va.ued Neutrosophic Hypersoft Expert Settings
收藏 引用
Computer Modeling in Engineering & Sciences 2025年 第1期142卷 531-553页
作者: Tma.er a.ba.la.Muha.ma. Ihsa. a.iqe Ur Ra.ma. Noora. a.ed a.sora.ea.Ha.iden a.d el-Wa.ed Kha.ifa Depa.tment of Ma.hema.ics College of SciencesPrincess Nourah bint Abdulrahman UniversityRiyadh11671Saudi Arabia 2 Depa.tment of Ma.hema.ics University of Management and TechnologyLahore54000Pakistan Depa.tment of Ma.hema.ics College of ScienceQassim UniversityBuraydah51452Saudi Arabia
The dra.a.ic rise in the number of people living in cities ha. ma.e ma.y environmenta. a.d socia. problems *** sea.ch for a.productive method for disposing of solid wa.te is the most nota.le of these *** schola.s ha.e... 详细信息
来源: 维普期刊数据库 维普期刊数据库 评论
Three-dimensiona. printing of bioma.eria.s for bonetissue engineering: a.review
收藏 引用
Frontiers of Ma.eria.s Science 2023年 第2期17卷 1-43页
作者: ahmed el-Fiqi Gla.s Resea.ch Depa.tment Advanced Materials Technology and Mineral Resources Research InstituteNational Research CentreCairo 12622Egypt
Processing bioma.eria.s into porous sca.folds for bone tissueengineering is a.critica. a.d a.key step in defining a.d controlling their physicochemica.,mecha.ica.,a.d biologica. *** such a. polymers a.e commonlyproces... 详细信息
来源: 维普期刊数据库 维普期刊数据库 同方期刊数据库 同方期刊数据库 评论
Sol-gel synthesis,properties a.d protein loa.ing/delivery ca.a.ity of hollow bioa.tive gla.s na.ospheres with la.ge hollow ca.ity a.d mesoporous shell
收藏 引用
Frontiers of Ma.eria.s Science 2022年 第3期16卷 145-157页
作者: ahmed el-FIQI Gla.s Resea.ch Depa.tment National Research CentreCairo 12622Egypt
Hollow na.ospheres exhibit unique properties a.d find a.wide interest in severa. potentia. a.plica.ions such a. drug ***,novel hollow bioa.tive gla.s na.ospheres(HBGn)with la.ge hollow ca.ity a.d la.ge mesopores in th... 详细信息
来源: 维普期刊数据库 维普期刊数据库 同方期刊数据库 同方期刊数据库 评论
Energy Efficiency of a.Sola. Green Building Using Bio-Sourced Ma.eria.s for Indoor Tempera.ure a.d Humidity Optimiza.ion
收藏 引用
Energy Engineering 2025年 第1期122卷 41-62页
作者: Soumia.ounir Youssef Ma.loufa.a.delha.id Kha.ba.i elina.ohd Husini Nurul Sya.a.bdul La.ip Ya.ubua.inuDodo Rime elHa.rouni Mina.ma.a. a.ma.Souidi Ma.ika.a.igui ahmed a.a.oune Na.iona. School of a.chitecture a.a.ir New Complex Ibn ZohrAgadirBP 20732Morocco EMDD CERNE2DUniversity of Mohammed V in RabatEst SaleSaleBP 227Morocco Thermodyna.ics a.d Energetics La.ora.ory Faculty of ScienceIbn Zohr UniversityAgadirBP 8106Morocco Fa.ulty of Built Environment University Sains Islam MalaysiaNilaiBP 71800Malaysia a.chitectura. Engineering Depa.tment Najran UniversityNajranBP 1988Saudi Arabia The Centre of Scientific a.d Engineering Resea.ch Najran UniversityNajranBP 1988Saudi Arabia Euro-Mediterra.ea. School of a.chitecture Design and UrbanismEuro-Mediterranean University of FezFezBP 51Morocco
a.clea. environment with low ca.bon emissions is the goa. of resea.ch on the development of green a.d susta.na.le buildings tha. use bio-sourced ma.eria.s in conjunction with sola. energy to crea.e more susta.na.le **... 详细信息
来源: 维普期刊数据库 维普期刊数据库 评论