全文获取类型
收费全文 | 7534篇 |
免费 | 198篇 |
国内免费 | 43篇 |
专业分类
电工技术 | 137篇 |
综合类 | 42篇 |
化学工业 | 1429篇 |
金属工艺 | 118篇 |
机械仪表 | 195篇 |
建筑科学 | 223篇 |
矿业工程 | 36篇 |
能源动力 | 161篇 |
轻工业 | 598篇 |
水利工程 | 47篇 |
石油天然气 | 31篇 |
武器工业 | 2篇 |
无线电 | 734篇 |
一般工业技术 | 1018篇 |
冶金工业 | 1881篇 |
原子能技术 | 95篇 |
自动化技术 | 1028篇 |
出版年
2022年 | 64篇 |
2021年 | 96篇 |
2020年 | 58篇 |
2019年 | 78篇 |
2018年 | 106篇 |
2017年 | 77篇 |
2016年 | 92篇 |
2015年 | 93篇 |
2014年 | 158篇 |
2013年 | 345篇 |
2012年 | 265篇 |
2011年 | 329篇 |
2010年 | 297篇 |
2009年 | 312篇 |
2008年 | 344篇 |
2007年 | 322篇 |
2006年 | 252篇 |
2005年 | 285篇 |
2004年 | 202篇 |
2003年 | 211篇 |
2002年 | 197篇 |
2001年 | 150篇 |
2000年 | 147篇 |
1999年 | 157篇 |
1998年 | 508篇 |
1997年 | 301篇 |
1996年 | 252篇 |
1995年 | 174篇 |
1994年 | 168篇 |
1993年 | 186篇 |
1992年 | 114篇 |
1991年 | 77篇 |
1990年 | 94篇 |
1989年 | 72篇 |
1988年 | 77篇 |
1987年 | 72篇 |
1986年 | 63篇 |
1985年 | 92篇 |
1984年 | 74篇 |
1983年 | 91篇 |
1982年 | 64篇 |
1981年 | 65篇 |
1980年 | 64篇 |
1979年 | 54篇 |
1978年 | 44篇 |
1977年 | 67篇 |
1976年 | 89篇 |
1975年 | 39篇 |
1974年 | 26篇 |
1973年 | 35篇 |
排序方式: 共有7775条查询结果,搜索用时 46 毫秒
1.
Aishwarya
Srivastava Siddhant Aggarwal Amy Apon Edward Duffy Ken Kennedy Andre Luckow Brandon Posey Marcin Ziolkowski 《Software》2020,50(6):868-898
We investigate the challenges of building an end-to-end cloud pipeline for real-time intelligent visual inspection system for use in automotive manufacturing. Current methods of visual detection in automotive assembly are highly labor intensive, and thus prone to errors. An automated process is sought that can operate within the real-time constraints of the assembly line and can reduce errors. Components of the cloud pipeline include capture of a large set of high-definition images from a camera setup at the assembly location, transfer and storage of the images as needed, execution of object detection, and notification to a human operator when a fault is detected. The end-to-end execution must complete within a fixed time frame before the next car arrives in the assembly line. In this article, we report the design, development, and experimental evaluation of the tradeoffs of performance, accuracy, and scalability for a cloud system. 相似文献
2.
Ken Kanazawa Shoji Yoshida Hidemi Shigekawa Shinji Kuroda 《Science and Technology of Advanced Materials》2015,16(1)
The reconstructed surface structure of the II–VI semiconductor ZnTe (110), which is a promising material in the research field of semiconductor spintronics, was studied by scanning tunneling microscopy/spectroscopy (STM/STS). First, the surface states formed by reconstruction by the charge transfer of dangling bond electrons from cationic Zn to anionic Te atoms, which are similar to those of IV and III–V semiconductors, were confirmed in real space. Secondly, oscillation in tunneling current between binary states, which is considered to reflect a conformational change in the topmost Zn–Te structure between the reconstructed and bulk-like ideal structures, was directly observed by STM. Third, using the technique of charge injection, a surface atomic structure was successfully fabricated, suggesting the possibility of atomic-scale manipulation of this widely applicable surface of ZnTe. 相似文献
3.
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
4.
Ken Yoda 《Advanced Robotics》2019,33(3-4):108-117
ABSTRACTThis review summarizes the advances in bio-logging technology that enables us to monitor foraging behavior, movement, behavioral performance, physiological performance, and sociality in a wide range of bird species, as well as their habitat. Subsequently, navigation is discussed, using long-distance movements in streaked shearwaters as a case study. Moreover, challenges and future research directions in bio-logging science are presented, with focus on: multimodal recording, big data analysis, feedback logging, low-power consumption and power generation systems, logger effects, and capture–recapture methods. 相似文献
5.
Good requirements practices are neither necessary nor sufficient 总被引:2,自引:2,他引:0
6.
Masters Rich S. W.; MacMahon Ken M. A.; Pall Hardev S. 《Canadian Metallurgical Quarterly》2004,49(1):79
Objective: This study examined whether disruption of performance is moderated in Parkinson's disease (PD) patients who acquire their motor behaviors in an implicit manner. Method: Twenty-seven patients with PD learned a hammering task in errorless (implicit) or errorful (explicit) conditions and were tested for robustness of motor performance under a secondary task load, which required them to continuously count backward as they performed the hammering task. Results: Patients in the errorless (implicit) motor learning condition exhibited robustness to secondary task loading, whereas patients in the errorful (explicit) motor learning condition did not. Conclusions: Implicit motor learning techniques should be considered by PD rehabilitation specialists in cases in which existing disruption to movements is exacerbated by conscious control. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
7.
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
8.
9.
The thermal decomposition products of pyridinium sulfate differ from those of pyridinium sulfate supported on zirconia which in turn differs from that of pyridine adsorbed on a sulfated zirconia. Unsupported pyridinium sulfate decomposes to produce pyridine and sulfuric acid, and these subsequently react to produce oxides of carbon and sulfur. Zirconia that is sulfated and then exposed to pyridine does not release detectable amount of pyridine during heating in an inert gas; rather the pyridine undergoes oxidation reduction reactions simultaneously to release CO2 and sulfur compounds. Pyridinium sulfate supported on zirconia decomposes upon heating to release pyridine and sulfuric acid, which reacts with the zirconia. The desorption of pyridine in one case and only CO2/SOx in the other case suggests that sulfated zirconia does not contain Brønsted acidity that can form pyridinium sulfate. 相似文献
10.
The paper presents the findings of a survey that investigated the level of quality management practice within some 150 UK companies from a sample of 500. It provides a snapshot of practice at the time of the survey, and assesses the impact of government quality initiatives particularly, the TickIT scheme at that time. The survey methodology is described, together with the results and conclusions. The sample has been graded by size of company, which the authors consider to have a significant effect upon the adoption of quality practices. The survey highlights the need to encourage small companies to adopt quality practices and to assist them with the short-term costs incurred. 相似文献