全文获取类型
收费全文 | 474篇 |
免费 | 25篇 |
专业分类
电工技术 | 5篇 |
综合类 | 1篇 |
化学工业 | 73篇 |
金属工艺 | 6篇 |
机械仪表 | 22篇 |
建筑科学 | 12篇 |
矿业工程 | 2篇 |
能源动力 | 7篇 |
轻工业 | 31篇 |
水利工程 | 4篇 |
石油天然气 | 1篇 |
无线电 | 49篇 |
一般工业技术 | 76篇 |
冶金工业 | 95篇 |
原子能技术 | 1篇 |
自动化技术 | 114篇 |
出版年
2023年 | 2篇 |
2022年 | 9篇 |
2021年 | 11篇 |
2020年 | 8篇 |
2019年 | 5篇 |
2018年 | 16篇 |
2017年 | 14篇 |
2016年 | 15篇 |
2015年 | 13篇 |
2014年 | 25篇 |
2013年 | 39篇 |
2012年 | 21篇 |
2011年 | 23篇 |
2010年 | 16篇 |
2009年 | 12篇 |
2008年 | 19篇 |
2007年 | 20篇 |
2006年 | 17篇 |
2005年 | 18篇 |
2004年 | 8篇 |
2003年 | 20篇 |
2002年 | 12篇 |
2001年 | 12篇 |
2000年 | 6篇 |
1999年 | 8篇 |
1998年 | 20篇 |
1997年 | 19篇 |
1996年 | 13篇 |
1995年 | 8篇 |
1994年 | 8篇 |
1993年 | 5篇 |
1992年 | 4篇 |
1990年 | 2篇 |
1989年 | 3篇 |
1986年 | 4篇 |
1985年 | 3篇 |
1984年 | 3篇 |
1983年 | 6篇 |
1982年 | 3篇 |
1981年 | 3篇 |
1980年 | 4篇 |
1978年 | 3篇 |
1977年 | 1篇 |
1976年 | 5篇 |
1975年 | 5篇 |
1973年 | 1篇 |
1967年 | 1篇 |
1964年 | 1篇 |
1927年 | 2篇 |
1909年 | 1篇 |
排序方式: 共有499条查询结果,搜索用时 15 毫秒
71.
P J Klutke P Mattioli F Baruffaldi A Toni K H Englmeier 《Computer methods and programs in biomedicine》1999,60(2):133-141
In this paper, we describe the 'Telemedicine Benchmark' (TMB), which is a set of standard procedures, protocols and measurements to test reliability and levels of performance of data exchange in a telemedicine session. We have put special emphasis on medical imaging, i.e. digital image transfer, joint viewing and editing and 3D manipulation. With the TMB, we can compare the aptitude of different video conferencing software systems for telemedicine issues and the effect of different network technologies (ISDN, xDSL, ATM, Ethernet). The evaluation criteria used are length of delays and functionality. For the application of the TMB, a data set containing radiological images and medical reports was set up. Considering the Benchmark protocol, this data set has to be exchanged between the partners of the session. The Benchmark covers file transfer, whiteboard usage, application sharing and volume data analysis and compression. The TMB has proven to be a useful tool in several evaluation issues. 相似文献
72.
73.
74.
75.
Toni Järvenpää Marja Salmimaa Tapani Levola 《Journal of the Society for Information Display》2011,19(2):230-237
Abstract— Virtual‐image (near‐to‐eye) and two‐view autostereoscopic (3‐D) displays share similar optical properties in the comfortable user position for viewing. In this paper, the definitions and criteria of qualified viewing space (QVS) and qualified stereoscopic viewing space (QSVS) are discussed. Due to the complex nature of these viewing spaces, the related presumptions and the required optical characteristics and their measurements are specified. The effects of different display and observer parameters, such as interpupillary distance, to the resulting viewing spaces are discussed. Finally, real measurement data of two autostereoscopic display devices are presented. 相似文献
76.
Dani Korpi Toni Heittola Timo Partala Antti Eronen Annamaria Mesaros Tuomas Virtanen 《Personal and Ubiquitous Computing》2013,17(4):761-769
When developing advanced location-based systems augmented with audio ambiances, it would be cost-effective to use a few representative samples from typical environments for describing a larger number of similar locations. The aim of this experiment was to study the human ability to discriminate audio ambiances recorded in similar locations of the same urban environment. A listening experiment consisting of material from three different environments and nine different locations was carried out with nineteen subjects to study the credibility of audio representations for certain environments which would diminish the need for collecting huge audio databases. The first goal was to study to what degree humans are able to recognize whether the recording has been made in an indicated location or in another similar location, when presented with the name of the place, location on a map, and the associated audio ambiance. The second goal was to study whether the ability to discriminate audio ambiances from different locations is affected by a visual cue, by presenting additional information in form of a photograph of the suggested location. The results indicate that audio ambiances from similar urban areas of the same city differ enough so that it is not acceptable to use a single recording as ambience to represent different yet similar locations. Including an image was found to increase the perceived credibility of all the audio samples in representing a certain location. The results suggest that developers of audio-augmented location-based systems should aim at using audio samples recorded on-site for each location in order to achieve a credible impression. 相似文献
77.
Derek Kelly Avimanyou Vatsa Wade Mayham Linh Ngô Addie Thompson Toni Kazic 《Machine Vision and Applications》2016,27(5):681-694
Almost all the world’s food is grown in open fields, where plant phenotypes can be very different from those observed in greenhouses. Geneticists and agronomists studying food crops routinely detect, measure, and classify a wide variety of phenotypes in fields that contain many visually distinct types of a single crop. Augmenting humans in these tasks by automatically interpreting images raises some important and nontrivial challenges for research in computer vision. Nonetheless, the rewards for overcoming these obstacles could be exceptionally high for today’s 7 billion people, let alone the 9.6 billion projected by 2050 (United Nations Department of Economic and Social Affairs, Population Division, World Population Prospects: The 2012 Revision). To stimulate dialog between researchers in computer vision and those in genetics and agronomy, we offer our views on three computational challenges that are central to many phenotyping tasks. These are disambiguating one plant from another; assigning an individual plant’s organs to it; and identifying field phenotypes from those shown in archival images. We illustrate these challenges with annotated photographs of maize highlighting the regions of interest. We also describe some of the experimental, logistical, and photographic constraints on image collection and processing. While collecting the data sets needed for algorithmic experiments requires sustained collaboration and funding, the images we show and have posted should allow one to consider the problems, think of possible approaches, and decide on the next steps. 相似文献
78.
Extracting complex lesion phenotypes in Zea mays 总被引:1,自引:0,他引:1
Derek Kelly Avimanyou Vatsa Wade Mayham Toni Kazic 《Machine Vision and Applications》2016,27(1):145-156
79.
Floral odor is a key trait for pollinator attraction in many plants, but may also direct antagonists like herbivores to flowers. In this study, we examined how floral scent changes after pollination in Silene latifolia, which has a specialized relationship with the seed predator Hadena bicruris. We found an overall decrease in total scent emission and considerable changes in relative amounts of scent compounds after pollination. Lilac aldehydes A and B as well as veratrole contributed most to the decrease in scent emission. These three compounds are known to be key signals for the attraction of H. bicruris to the flowers. A specific downregulation of these compounds may increase the reproductive success of the plant by reducing seed predation after pollination. 相似文献
80.
Kirill Tikhomirov Oliver Krcher Martin Elsener Markus Widmer Alexander Wokaun 《Applied catalysis. B, Environmental》2006,67(3-4):160-167
The storage of SO2 in manganese based materials was investigated in flow reactor experiments. Manganese oxide precipitated with ammonia and hydrogen peroxide stored about 76 wt.% of SO2 at a high diffusion rate into the bulk. Doping with potassium increases the SO2 storage rate substantially at 200 °C, but has an only minor effect at 400 °C. Kinetic studies showed that the storage of SO2 in pure and potassium doped manganese oxide is controlled by the kinetics of the sulfate formation reaction on the catalyst surface up to complete sulfation, whereas the storage on manganese cerium mixed oxide is limited by internal diffusion of the formed sulfate. The sulfate formation reaction was found to be first order with respect to both SO2 and manganese oxide. For the potassium doped catalyst sulfur was found to be bound on manganese sites being transferred to potassium afterwards. 相似文献