咨询与建议

限定检索结果

文献类型

  • 53,312 篇 期刊文献
  • 3,877 篇 会议
  • 2,907 册 图书
  • 36 篇 学位论文
  • 14 篇 报纸

馆藏范围

  • 58,900 篇 电子文献
  • 1,300 种 纸本馆藏

日期分布

学科分类号

  • 23,761 篇 工学
    • 5,504 篇 材料科学与工程(可...
    • 3,477 篇 化学工程与技术
    • 2,794 篇 生物医学工程(可授...
    • 2,602 篇 机械工程
    • 2,089 篇 计算机科学与技术...
    • 2,083 篇 动力工程及工程热...
    • 1,921 篇 电子科学与技术(可...
    • 1,588 篇 力学(可授工学、理...
    • 1,587 篇 地质资源与地质工...
    • 1,533 篇 电气工程
    • 1,485 篇 环境科学与工程(可...
    • 1,324 篇 水利工程
    • 1,312 篇 冶金工程
    • 1,253 篇 控制科学与工程
    • 1,184 篇 建筑学
  • 19,542 篇 医学
    • 16,225 篇 临床医学
    • 2,572 篇 医学技术(可授医学...
    • 2,445 篇 基础医学(可授医学...
    • 1,684 篇 公共卫生与预防医...
    • 1,489 篇 中西医结合
  • 14,018 篇 理学
    • 3,801 篇 化学
    • 3,586 篇 物理学
    • 3,277 篇 生物学
    • 1,703 篇 数学
    • 1,454 篇 地质学
    • 1,350 篇 地球物理学
  • 5,544 篇 农学
    • 1,681 篇 作物学
    • 1,275 篇 畜牧学
  • 3,045 篇 管理学
    • 1,225 篇 管理科学与工程(可...
  • 1,851 篇 经济学
    • 1,611 篇 应用经济学
  • 1,780 篇 教育学
  • 1,313 篇 法学
  • 1,145 篇 文学
  • 639 篇 艺术学
  • 469 篇 历史学
  • 373 篇 哲学
  • 132 篇 军事学

主题

  • 489 篇 mri
  • 486 篇 ct
  • 399 篇 美国
  • 355 篇 患者
  • 253 篇 病人
  • 238 篇 mr
  • 162 篇 中国
  • 146 篇 北美洲
  • 131 篇 analysis
  • 117 篇 治疗
  • 104 篇 美利坚合众国
  • 104 篇 of
  • 99 篇 cancer
  • 81 篇 health
  • 78 篇 应用
  • 75 篇 and
  • 74 篇 儿童
  • 73 篇 acid
  • 71 篇 diabetes
  • 71 篇 英国

机构

  • 183 篇 香港理工大学
  • 123 篇 西南民族大学
  • 101 篇 南京大学
  • 99 篇 北京大学
  • 73 篇 同济大学
  • 68 篇 university of mi...
  • 67 篇 institute for pa...
  • 67 篇 nikhef p.o.box 4...
  • 67 篇 fysikum stockhol...
  • 67 篇 michigan state u...
  • 67 篇 institut fur the...
  • 67 篇 dept.of physics ...
  • 67 篇 compas group ins...
  • 67 篇 rudolf peierls c...
  • 67 篇 nstitucio catala...
  • 67 篇 department of ph...
  • 66 篇 national researc...
  • 66 篇 school of physic...
  • 66 篇 ludwig-maximilia...
  • 66 篇 cea/saclay dsm/i...

作者

  • 163 篇 叶鹏
  • 85 篇 h.murayama
  • 85 篇 j.d.jackson
  • 85 篇 g.d'ambrosio
  • 85 篇 m.white
  • 84 篇 刘闯
  • 81 篇 p.de jong
  • 78 篇 v.i.belousov
  • 67 篇 china
  • 60 篇 v.burkert
  • 59 篇 joanna c.lee
  • 47 篇 kavli ipmu
  • 46 篇 l.pape
  • 44 篇 王铮
  • 44 篇 郭俊
  • 43 篇 y.hayato
  • 43 篇 刘莉
  • 39 篇 a.v.gritsan
  • 37 篇 朱国栋
  • 34 篇 余英豪

语言

  • 39,848 篇 中文
  • 20,263 篇 英文
  • 14 篇 其他
检索条件"作者=C.KLAASSEN"
60146 条 记 录,以下是201-210 订阅
排序:
Adaptive Marine Predator Optimization Algorithm(AOMA)-Deep Supervised Learning classification(DSLc)based IDS framework for MANET security
收藏 引用
Intelligent and converged Networks 2024年 第1期5卷 1-18页
作者: M.Sahaya Sheela A.Gnana Soundari Aditya Mudigonda c.Kalpana K.Suresh K.Somasundaram Yousef Farhaoui Department of Electronics and communication Engineering Vel Tech Rangarajan Dr.Sagunthala R&D Institute of Science and TechnologyChennai 600069India Department of computer Science and Engineering Saveetha School of EngineeringSIMATSChennai 602105India JNIAS School of Planning and Architecture Hyderabad 500034India Department of computer Science and Engineering NPR College of Engineering and TechnologyNatham Dindigul 624401India Department of computer Science and Engineering PSNA College of Engineering and TechnologyPoolangulathupatti 620009India Department of computer Science and Engineering Sri Muthukumaran Institute of TechnologyChennai 600069India Department of computer Science Moulay Ismail UniversityMeknes 5003Morocco
Due to the dynamic nature and node mobility,assuring the security of Mobile Ad-hoc Networks(MANET)is one of the difficult and challenging tasks *** MANET,the Intrusion Detection System(IDS)is crucial because it aids i... 详细信息
来源: 维普期刊数据库 维普期刊数据库 评论
Rationale and design of Tenecteplase Reperfusion Therapy in Acute Ischaemic cerebrovascular Events III (TRAcE III): a randomised, phase III, open- label, controlled trial
收藏 引用
Stroke & Vascular Neurology 2024年 第1期9卷 82-89页
作者: Yunyun Xiong Bruce c V campbell Marc Fisher Lee H Schwamm Mark Parsons Hao Li Yuesong Pan Xia Meng Xingquan Zhao Yongjun Wang Neurology Beijing Tiantan HospitalBeijingChina china National clinical Research center for Neurological Diseases BeijingChina Department of Medicine and Neurology The University of MelbourneMelbourneVictoriaAustralia Neurology Beth Israel Deaconess Medical CenterBostonMassachusettsUSA Department of Neurology and comprehensive Stroke center Massachusetts General HospitalBostonMassachusettsUSA Department of Neurology University of New South Wales South Western Sydney Clinical SchoolLiverpoolNew South WalesAustralia
Background and purpose Recombinant human TNK tissue-type plasminogen activator(rhTNK-tPA)was not inferior to alteplase for ischaemic stroke within *** study aimed to investigate the efficacy and safety of rhTNK-tPA in... 详细信息
来源: 维普期刊数据库 维普期刊数据库 评论
Triple the steady-state reaction rate by decorating the In_(2)O_(3)surface with SiO_(x)for cO_(2)hydrogenation
收藏 引用
Journal of Energy chemistry 2024年 第8期95卷 96-105,I0003页
作者: Hao Wang chun Yang Xiaoyan Yu Mingrui Wang Runze Yang Xiaowa Nie Ben Hang Yin Alex c.K.Yip chunshan Song Guanghui Zhang Xinwen Guo State Key Laboratory of Fine chemicals Frontier Science Center for Smart MaterialsPSU-DUT Joint Center for Energy ResearchSchool of Chemical EngineeringDalian University of TechnologyDalian 116024LiaoningChina Department of chemistry the Chinese University of Hong KongHong Kong 999077China Paihau-Robinson Research Institute the MacDiarmid Institute for Advanced Materials and NanotechnologyVictoria University of WellingtonWellington 6012New Zealand Department of chemical and Process Engineering The University of CanterburyChristchurch 8041New Zealand
Indium oxide(In_(2)O_(3)),as a promising candidate for cO_(2)hydrogenation to c_(1) products,often suffers from sintering and activity decline,closely related to the undesirable structural evolution under reaction ***... 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
Beta-HcG Levels and Ovarian Ultrasonography Results among Non-Pregnant Women of Reproductive Age in Port Harcourt, Nigeria: A cross-Sectional Study
收藏 引用
Journal of Biosciences and Medicines 2024年 第5期12卷 233-241页
作者: celine c. Agonsi Francis Anacletus Joel Aluko chinemerem Eleke Joy c. Samuel African centre of Public Health and Toxicological Research (AcE-PUTOR) University of Port Harcourt Choba Nigeria Department of Nursing Science University of Port Harcourt Choba Nigeria
Background: certain ovarian cancers that were previously common in postmenopausal women are now increasingly observed in women of reproductive age. The research on using β-HcG as a diagnostic biomarker for ovarian ca... 详细信息
来源: 维普期刊数据库 维普期刊数据库 评论
Post-fire recovery of Puya raimondii, vegetation and birds in the puna of Huascarán National Park, Perú
收藏 引用
Journal of Mountain Science 2024年 第1期21卷 20-32页
作者: Mery L.SUNI Giovana P.VADILLO césar ARANA Enoc JARA-PENA Letty SALINAS M.Estela PONcE Paul M.RAMSAY Plant Physiology Laboratory Faculty of Biological SciencesUniversidad Nacional Mayor de San MarcosLima 15081Peru Natural History Museum Universidad Nacional Mayor de San MarcosLima 15072Peru Applied Phytology Laboratory Faculty of Biological SciencesUniversidad Nacional Mayor de San MarcosLima 15081Peru Department of Statistics Faculty of Mathematical SciencesUniversidad Nacional Mayor de San MarcosLima 15081Peru Department of chemical and Biological Sciences Universidad de las Américas PueblaSan Andrés Cholula CP Cholula CP 72810Mexico
A large fire of 233 ha in Huascarán National Park in Peru provided an opportunity to compare plant and bird responses in burned and nearby unburned zones of the puna. Heights and live diameters of flagship Puya raimo... 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
Highly efficient fiber to Si waveguide free-form coupler for foundry-scale silicon photonics
收藏 引用
Photonics Research 2024年 第5期12卷 1055-1066页
作者: LUIGI RANNO JIA Xu BRIAN SIA cOSMIN POPEScU DREW WENINGER SAMUEL SERNA SHAOLIANG YU LIONEL c.KIMERLING ANURADHA AGARWAL TIAN GU JUEJUN HU Department of Materials Science&Engineering Massachusetts Institute of TechnologyCambridgeMassachusetts 02139USA centre for Micro-&Nano-Electronics(cMNE) Nanyang Technological UniversitySingapore 639798Singapore Department of Physics Photonics and Optical EngineeringBridgewater State UniversityBridgewaterMassachusetts 02324USA Zhejiang Laboratory Hangzhou 311100China Materials Research Laboratory Massachusetts Institute of TechnologyCambridgeMassachusetts 02139USA
As silicon photonics transitions from research to commercial deployment,packaging solutions that efficiently couple light into highly compact and functional sub-micrometer silicon waveguides are imperative but remain ... 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 同方期刊数据库 同方期刊数据库 评论
Barosinusitis due to routine weather changes:A cross-sectional analysis of public websites
收藏 引用
World Journal of Otorhinolaryngology-Head and Neck Surgery 2024年 第1期10卷 18-23页
作者: James c.campbell Julia E.canick Philip G.chen Ralph Abi Hachem David W.Jang Department of Head and Neck Surgery&communication Sciences Duke University School of MedicineDurhamNorth CarolinaUSA Duke University School of Medicine DurhamNorth CarolinaUSA Department of Otolaryngology-Head and Neck Surgery University of Texas Health Science Center San AntonioSan AntonioTexasUSA
Background:Sinusitis is a common diagnosis that can be erroneously associated with routine weather‐related barometric pressure *** actuality,these pressure changes likely exacerbate migraine headaches,which can cause... 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
Degradation and resynthesis of chlorophyll during increased oxidative stress and prolonged darkness differ between annual and perennial flax(Linum L.)
收藏 引用
Oil crop Science 2024年 第2期9卷 121-130页
作者: Kenyon J. Nisbett Abida Alokozai Su Hyun Elizabeth Ko G. Adam Mott Jason c.L. Browna Department of Biological Sciences University of Toronto ScarboroughTorontoONCanada Department of cell&Systems Biology University of TorontoTorontoONCanada centre for the Analysis of Genome Evolution&Function University of TorontoTorontoONCanada
Among plants,there is considerable variation in lifespan:annuals live less than one year,whereas perennials live for several years,with the longest-living perennial having survived 43,600 *** proposed by the Disposabl... 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
changes in calcium accumulation and utilization efficiency and their impact on recycling, immobilization, and export across the oil palm cycle
收藏 引用
Oil crop Science 2024年 第3期9卷 143-150页
作者: Viégas I.D.J.M. Souza L.c.D. Ferreira E.V.D.O. costa M.G. Nogueira G.A.D.S. Nascimento V.R.D. Oliveira Neto c.F.D. capanema campus Federal Rural University of the Amazon (UFRA) Av. Barão de Capanema Caixa D'agua 5514-6434 Pará Brazil center of Agricultural and Environmental Sciences Federal University of Maranhão (UFMA) Chapadinha BR-222 km 04 SN Boa Vista 65500000 Maranhão Brazil capitão Poço campus Federal Rural University of the Amazon (UFRA) Tv. Pau Amarelo S/n - Vila Nova Capitão Poço 68650-000 Pará Brazil Department of Soil Science São Paulo State University (Unesp) School of Agricultural and Veterinarian Sciences Jaboticabal Via de Acesso Prof. Paulo Donato Castelane Castellane - S/N - Vila Industrial São Paulo 14884-900 Brazil Institute of Agricultural Sciences (IcA) Federal Rural University of the Amazon (UFRA) Estr. Principal da Ufra 2150 Curió-Utinga Belém 66077-580 Pará Brazil
Effective calcium (ca) management is crucial for optimizing oil palm cultivation and enhancing crop yield. This study aimed to gain insights into the dynamics of ca concentration, accumulation, exportation, immobiliza... 详细信息
来源: 维普期刊数据库 维普期刊数据库 评论
Awareness of the Termination of Pregnancy Act of the Laws of Zambia among Women of Reproductive Age at Kanyama First Level Hospital in Lusaka District Zambia
收藏 引用
Open Journal of Obstetrics and Gynecology 2024年 第8期14卷 1267-1287页
作者: J. K. Botha c. c. Ngoma P. S. Munkoka Lusaka District Health Office Matero First Level Hospital Lusaka Zambia Department of Midwifery Womens and Child Health School of Nursing Sciences University of Zambia Lusaka Zambia college of Nursing and Midwifery University of Lusaka Lusaka Zambia
Background: Termination of pregnancy (TOP) in Zambia is guided by the Termination of Pregnancy (TOP) Act of 1972 and as amended in 1994 of the laws of Zambia. However, despite provision of comprehensive abortion care ... 详细信息
来源: 维普期刊数据库 维普期刊数据库 评论