全文获取类型
收费全文 | 11722篇 |
免费 | 1263篇 |
国内免费 | 1086篇 |
专业分类
电工技术 | 351篇 |
技术理论 | 4篇 |
综合类 | 1626篇 |
化学工业 | 794篇 |
金属工艺 | 224篇 |
机械仪表 | 831篇 |
建筑科学 | 1130篇 |
矿业工程 | 154篇 |
能源动力 | 89篇 |
轻工业 | 265篇 |
水利工程 | 179篇 |
石油天然气 | 132篇 |
武器工业 | 78篇 |
无线电 | 807篇 |
一般工业技术 | 769篇 |
冶金工业 | 663篇 |
原子能技术 | 24篇 |
自动化技术 | 5951篇 |
出版年
2024年 | 105篇 |
2023年 | 230篇 |
2022年 | 383篇 |
2021年 | 378篇 |
2020年 | 319篇 |
2019年 | 269篇 |
2018年 | 222篇 |
2017年 | 237篇 |
2016年 | 339篇 |
2015年 | 309篇 |
2014年 | 504篇 |
2013年 | 654篇 |
2012年 | 662篇 |
2011年 | 703篇 |
2010年 | 669篇 |
2009年 | 710篇 |
2008年 | 739篇 |
2007年 | 915篇 |
2006年 | 843篇 |
2005年 | 735篇 |
2004年 | 703篇 |
2003年 | 619篇 |
2002年 | 507篇 |
2001年 | 439篇 |
2000年 | 391篇 |
1999年 | 310篇 |
1998年 | 200篇 |
1997年 | 118篇 |
1996年 | 138篇 |
1995年 | 144篇 |
1994年 | 112篇 |
1993年 | 100篇 |
1992年 | 72篇 |
1991年 | 60篇 |
1990年 | 42篇 |
1989年 | 53篇 |
1988年 | 38篇 |
1987年 | 17篇 |
1986年 | 15篇 |
1985年 | 13篇 |
1984年 | 5篇 |
1980年 | 3篇 |
1979年 | 5篇 |
1968年 | 3篇 |
1966年 | 3篇 |
1965年 | 3篇 |
1963年 | 4篇 |
1962年 | 3篇 |
1960年 | 3篇 |
1958年 | 3篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Bianka Rocha Saraiva Lucas Henrique Maldonado da Silva Fernando Antônio Anjo Ana Carolina Pelaes Vital Jéssica Bassi Da Silva Marcos Luciano Bruschi Paula Toshimi Matumoto Pintro 《International Journal of Food Science & Technology》2020,55(5):1962-1970
Debittered trub (brewing waste) is an important source of protein source (70.26%). Trub and whey protein were used for 5% protein enrichment of ice cream frozen by liquid nitrogen. Three formulations were elaborated: ice cream standard (ICS), ice cream with whey protein (ICW) and ice cream with trub (ICT). Chemical composition, rheological properties, texture, overrun, melting rate, scanning electron microscopy and a sensorial test were performed. Results showed that ICT presented a higher viscosity, obtained on the upward curve up to 6.76 Pa s−1, consistency index (22.96 (Pa s−1)n), hysteresis area (140.40 mPa s−1) and hardness (31113.33 g) but a lower melting rate (0.38 g min−1), overrun (13.92%) and sensorial acceptability than the other formulations. The addition of trub debittered for protein enrichment improved ice cream properties and demonstrated that it could be used as a food ingredient. 相似文献
2.
AbstractIndustry 4.0 aims at providing a digital representation of a production landscape, but the challenges in building, maintaining, optimizing, and evolving digital models in inter-organizational production chains have not been identified yet in a systematic manner. In this paper, various Industry 4.0 research and technical challenges are addressed, and their present scenario is discussed. Moreover, in this article, the novel concept of developing experience-based virtual models of engineering entities, process, and the factory is presented. These models of production units, processes, and procedures are accomplished by virtual engineering object (VEO), virtual engineering process (VEP), and virtual engineering factory (VEF), using the knowledge representation technique of Decisional DNA. This blend of the virtual and physical domains permits monitoring of systems and analysis of data to foresee problems before they occur, develop new opportunities, prevent downtime, and even plan for the future by using simulations. Furthermore, the proposed virtual model concept not only has the capability of Query Processing and Data Integration for Industrial Data but also real-time visualization of data stream processing. 相似文献
3.
4.
Computer‐Interpretable Guidelines (CIGs) are the dominant medium for the delivery of clinical decision support, given the evidence‐based nature of their source material. Therefore, these machine‐readable versions have the ability to improve practitioner performance and conformance to standards, with availability at the point and time of care. The formalisation of Clinical Practice Guideline knowledge in a machine‐readable format is a crucial task to make it suitable for the integration in Clinical Decision Support Systems. However, the current tools for this purpose reveal shortcomings with respect to their ease of use and the support offered during CIG acquisition and editing. In this work, we characterise the current landscape of CIG acquisition tools based on the properties of guideline visualisation, organisation, simplicity, automation, manipulation of knowledge elements, and guideline storage and dissemination. Additionally, we describe the CompGuide Editor, a tool for the acquisition of CIGs in the CompGuide model for Clinical Practice Guidelines that also allows the editing of previously encoded guidelines. The Editor guides the users throughout the process of guideline encoding and does not require proficiency in any programming language. The features of the CIG encoding process are revealed through a comparison with already established tools for CIG acquisition. 相似文献
5.
Maqbool Ali Jamil Hussain Sungyoung Lee Byeong Ho Kang Kashif Sattar 《Expert Systems》2020,37(1):e12401
The case-based learning (CBL) approach has gained attention in medical education as an alternative to traditional learning methodology. However, current CBL systems do not facilitate and provide computer-based domain knowledge to medical students for solving real-world clinical cases during CBL practice. To automate CBL, clinical documents are beneficial for constructing domain knowledge. In the literature, most systems and methodologies require a knowledge engineer to construct machine-readable knowledge. Keeping in view these facts, we present a knowledge construction methodology (KCM-CD) to construct domain knowledge ontology (i.e., structured declarative knowledge) from unstructured text in a systematic way using artificial intelligence techniques, with minimum intervention from a knowledge engineer. To utilize the strength of humans and computers, and to realize the KCM-CD methodology, an interactive case-based learning system(iCBLS) was developed. Finally, the developed ontological model was evaluated to evaluate the quality of domain knowledge in terms of coherence measure. The results showed that the overall domain model has positive coherence values, indicating that all words in each branch of the domain ontology are correlated with each other and the quality of the developed model is acceptable. 相似文献
6.
新形势下电气工程及其自动化专业人才培养模式与知识体系框架 总被引:21,自引:8,他引:13
在分析了当前高等教育培养基本模式的基础上,根据科学技术和社会经济发展的要求,提出了人才培养的模式和要求。特别针对电气工程及其自动化领域的发展趋势以及对人才的需求,提出了该专业人才的知识框架体系。 相似文献
7.
RENGong-chang LIUYong-hong ZHANGYou-yun 《国际设备工程与管理》2003,8(2):115-121
Product innovation,for a truly strong solution,needs deep knowledge.Based on this point,the authors draw a conclusion that patents are the main resource of deep technique knowledge.There are five levels of newly organized patents.The main results of the studies on patents are various tech-nique effects.The database of effects is organized and managed according to the form of function-effect structure. 相似文献
8.
Understanding the differences between how novice and experienced designers approach design tasks 总被引:2,自引:1,他引:1
Research was undertaken to understand how to provide the most appropriate support for novice designers in engineering design.
However, how designers apply their experience and knowledge is not understood and further research in this area is required.
This paper describes an observational study to understand how novice and experienced designers approach design tasks.
Electronic Publication 相似文献
9.
10.
大坝安全监控专家系统中的知识处理 总被引:2,自引:1,他引:1
在介绍产生式规则及其数学模型的基础上,论述了用成熟的关系数据库 技术来表示和存储产生式规则表示的专家知识的方法,较好地解决了知识的存储和管理问题 。同时,利用关系数据库中实体间的关系,很容易将分散存储的规则元素组合成规则供推理 时使用。在分析了大坝安全监控专家系统知识特点的基础上举例说明了用关系数据库表 示产生式规则的具体方法。 相似文献