全文获取类型
收费全文 | 163篇 |
免费 | 2篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 5篇 |
化学工业 | 24篇 |
金属工艺 | 1篇 |
机械仪表 | 2篇 |
建筑科学 | 4篇 |
能源动力 | 6篇 |
轻工业 | 35篇 |
无线电 | 25篇 |
一般工业技术 | 25篇 |
冶金工业 | 8篇 |
自动化技术 | 31篇 |
出版年
2022年 | 3篇 |
2021年 | 3篇 |
2020年 | 1篇 |
2019年 | 1篇 |
2018年 | 3篇 |
2017年 | 1篇 |
2016年 | 3篇 |
2015年 | 3篇 |
2014年 | 6篇 |
2013年 | 7篇 |
2012年 | 4篇 |
2011年 | 9篇 |
2010年 | 10篇 |
2009年 | 8篇 |
2008年 | 7篇 |
2007年 | 8篇 |
2006年 | 10篇 |
2005年 | 8篇 |
2004年 | 7篇 |
2003年 | 2篇 |
2002年 | 4篇 |
2001年 | 2篇 |
2000年 | 6篇 |
1999年 | 4篇 |
1998年 | 6篇 |
1997年 | 5篇 |
1996年 | 9篇 |
1995年 | 2篇 |
1994年 | 3篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1991年 | 4篇 |
1990年 | 2篇 |
1989年 | 1篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1985年 | 1篇 |
1982年 | 1篇 |
1979年 | 2篇 |
1978年 | 3篇 |
1964年 | 1篇 |
排序方式: 共有166条查询结果,搜索用时 31 毫秒
1.
van de Kamp M.M.J.L. Tervonen J.K. Salonen E.T. Baptista J.P.V. 《Electronics letters》1996,32(12):1074-1075
The prediction models for scintillation variance of ITU-R and Karasawa et al. (1988) are compared to measurements on a time base which is much shorter than originally considered for these models. It is shown that even after averaging over just three days, a good correlation with the measured variance is found. Both models predict higher scintillation variance than is measured at 19.8 GHz on a 12.7° elevation path in Kirkkonummi, Finland 相似文献
2.
A 63-year-old man developed paraparesis and signs of meningeal irritation 4 days after a fall which caused a minor contusion of the cervical spine. Magnetic resonance imaging (MRI) revealed an extensive spinal subdural hematoma. The usefulness of MRI for diagnosis and successful conservative treatment is discussed. 相似文献
3.
Heikki Hämmäinen Eero Eloranta Esko Pohjanpalo 《Journal of Intelligent Manufacturing》1990,1(4):203-215
Flexible integration of distributed design and manufacturing activities is one of the key issues in applying just-in-time principles along the logistics chain. The potential of AI based approaches in this field is clear, but the inherent asynchrony, concurrency, and inconsistency of distributed operations has reduced enthusiasm so far.This paper discusses coordination in the context of geographically distributed manufacturing of one-of-a-kind products. Cooperation of partners is based on semi-automated user agents which operate as an integrative layer between more dedicated tools and systems. The management of order changes in elevator manufacture is used as a case example.The work reported here is part of the DIMUN project (DIMUN, 1989) in the RACE program. 相似文献
4.
Valeri Shevtsov Alexander Frolov Igor Lukashevich Eero Ylinen Pekka Malmi Matti Punkkinen 《Journal of Low Temperature Physics》1994,95(5-6):815-833
The combined techniques of ESR and NMR were used to investigate the process of ortho-para conversion in solid molecular hydrogen, containing small amounts ( 500 ppm) of hydrogen atoms as impurity. Although the impurity atoms catalyze the effective conversion of the neighboring ortho-H2, the total catalyzed conversion rate at temperatures from 2.2 K to 4.4 K is much less than expected from the rate of the H atoms recombination. A possible explanation is given in terms of the diffusion of H atoms, which is confined to some defects in the crystal. 相似文献
5.
A Parametric Texture Model Based on Joint Statistics of Complex Wavelet Coefficients 总被引:27,自引:0,他引:27
We present a universal statistical model for texture images in the context of an overcomplete complex wavelet transform. The model is parameterized by a set of statistics computed on pairs of coefficients corresponding to basis functions at adjacent spatial locations, orientations, and scales. We develop an efficient algorithm for synthesizing random images subject to these constraints, by iteratively projecting onto the set of images satisfying each constraint, and we use this to test the perceptual validity of the model. In particular, we demonstrate the necessity of subgroups of the parameter set by showing examples of texture synthesis that fail when those parameters are removed from the set. We also demonstrate the power of our model by successfully synthesizing examples drawn from a diverse collection of artificial and natural textures. 相似文献
6.
Saastamoinen A Huupponen E Värri A Hasan J Himanen SL 《Computer methods and programs in biomedicine》2006,82(1):58-66
In this article, we present a new implementation of an amplitude-independent method for continuous-scale sleep depth estimation. Having been implemented as an add-on analysis module under commercially available biosignal recording and analysis software, it can be easily applied in clinical routine. The software gives the user full freedom to change all the analysis parameters inside theoretical limits. Computational sleep depth profiles produced by the presented software compare favourably with visual classifications. Future work will concentrate on systematic optimization of analysis parameters, further evaluation of the method with disturbed sleep and application of the method for automated adaptive sleep analysis. 相似文献
7.
8.
Although the review process is defined in an extremely formal way, each company normally has its own way of tailoring it, because staff tend to see formal reviews as too heavy a method for practical software development. These tailored versions differ in type and in the grade of formality. This paper introduces some easy ways to improve the review process. The goal is to find steps which are simple enough for the management and staff to accept and efficient enough to improve the review process. 相似文献
9.
In this article, canonical and spectrally minimal infinite-dimensional state space realizations for periodic functions are considered. It is shown that the periodic functions having ℓ1 Fourier coefficients are precisely those realizable by a Riesz spectral system (RSS) in which the system operator generates a periodic strongly continuous semigroup and the observation operator is bounded. This realization can easily be converted to a canonical and spectrally minimal form. It is shown how the use of RSS and Cesáro sums of Fourier series allows the construction of a state space realization for a given periodic function merely integrable over its period. Simple finite-dimensional approximations with error bounds are derived for the RSS realization. Regular well-posed linear systems (WPLS) are used to construct a Fuhrmann-type realization for a given periodic function integrable over its period. It is shown that the RSS realizations and WPLS realizations are precisely equally good at coping with the possible ill behavior of a given bounded periodic function integrable over its period, but the WPLS realization is not always spectrally minimal or canonical. 相似文献
10.
Eero Hyvnen Eetu Mkel Mirva Salminen Arttu Valo Kim Viljanen Samppa Saarela Miikka Junnila Suvi Kettula 《Journal of Web Semantics》2005,3(2-3):224
This article presents the semantic portal MuseumFinland for publishing heterogeneous museum collections on the Semantic Web. It is shown how museums with their semantically rich and interrelated collection content can create a large, consolidated semantic collection portal together on the web. By sharing a set of ontologies, it is possible to make collections semantically interoperable, and provide the museum visitors with intelligent content-based search and browsing services to the global collection base. The architecture underlying MuseumFinland separates generic search and browsing services from the underlying application dependent schemas and metadata by a layer of logical rules. As a result, the portal creation framework and software developed has been applied successfully to other domains as well. MuseumFinland got the Semantic Web Challence Award (second prize) in 2004. 相似文献