全文获取类型
收费全文 | 213篇 |
免费 | 11篇 |
专业分类
电工技术 | 6篇 |
化学工业 | 86篇 |
金属工艺 | 4篇 |
机械仪表 | 3篇 |
建筑科学 | 7篇 |
矿业工程 | 1篇 |
能源动力 | 1篇 |
轻工业 | 33篇 |
武器工业 | 1篇 |
无线电 | 7篇 |
一般工业技术 | 49篇 |
冶金工业 | 2篇 |
原子能技术 | 1篇 |
自动化技术 | 23篇 |
出版年
2023年 | 2篇 |
2022年 | 3篇 |
2021年 | 5篇 |
2020年 | 3篇 |
2019年 | 5篇 |
2018年 | 8篇 |
2017年 | 8篇 |
2016年 | 9篇 |
2015年 | 7篇 |
2014年 | 5篇 |
2013年 | 25篇 |
2012年 | 13篇 |
2011年 | 19篇 |
2010年 | 13篇 |
2009年 | 15篇 |
2008年 | 11篇 |
2007年 | 4篇 |
2006年 | 7篇 |
2005年 | 1篇 |
2004年 | 4篇 |
2003年 | 6篇 |
2002年 | 2篇 |
2001年 | 2篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1993年 | 3篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1984年 | 2篇 |
1983年 | 5篇 |
1982年 | 3篇 |
1981年 | 8篇 |
1980年 | 3篇 |
1979年 | 3篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1974年 | 3篇 |
1973年 | 5篇 |
1966年 | 2篇 |
排序方式: 共有224条查询结果,搜索用时 0 毫秒
21.
Master equations in the Lindblad form describe evolution of open quantum systems that are completely positive and simultaneously have a semigroup property. We analyze the possibility to derive this type of master equations from an intrinsically discrete dynamics that is modelled as a sequence of collisions between a given quantum system (a qubit) with particles that form the environment. In order to illustrate our approach we analyze in detail how the process of an exponential decay and the process of decoherence can be derived from a collision-like model in which particular collisions are described by SWAP and controlled-NOT interactions, respectively.Presented at the 36th Symposium on Mathematical Physics, “Open Systems & Quantum Information”, Toruń, Poland, June 9-12, 2004. 相似文献
22.
This paper is aimed at theoretical aspects of the application of superconducting quantum magnetometers in measurement of beam
intensity of electrically charged particles in superconductive accelerators. The parameters of antenna system, which picks
up the magnetic field induced by unidirectional component of the accelerated particles current, are examined. From the analysis
it follows that for accelerators with a beam trajectory radius of the order of10
1
m the spectral sensitivity limit is of the order of (10
2–103) elementary particles/(cycleHz
1/2). 相似文献
23.
Strohalm M Strohalm J Kaftan F Krásný L Volný M Novák P Ulbrich K Havlíček V 《Analytical chemistry》2011,83(13):5458-5462
Traditional tissue-sectioning techniques for histological samples utilize various embedding media to stabilize the tissue on a sectioning target and to provide a smooth cutting surface. Due to the ion suppression effect in MALDI ionization and number of background peaks in the low-mass region, these media are not suitable for mass spectrometry imaging (MSI) experiments. To overcome this, droplets of water are often used to mount the tissue on a sectioning target, but the ice block formed around the tissue does not provide a good support for sectioning of fragile samples. In this work, we propose a novel embedding media, compatible with MALDI ionization and MSI experiments, based on poly[N-(2-hydroxypropyl)methacrylamide] (pHPMA). Using a reversible addition-fragmentation chain transfer polymerization technique, well-defined pHPMA polymer with narrow mass distribution was prepared. Benefits of the resulted pHPMA-based embedding media were tested on different tissue samples. 相似文献
24.
Petr Matula Pavel Matula Michal Kozubek Vladimír Dvorák 《IEEE transactions on image processing》2006,15(8):2388-2396
Typical time intervals between acquisitions of three-dimensional (3-D) images of the same cell in live cell imaging are in the orders of minutes. In the meantime, the live cell can move in a water basin on the stage. This movement can hamper the studies of intranuclear processes. We propose a fast point-based image registration method for the suppression of the movement of a cell as a whole in the image data. First, centroids of certain intracellular objects are computed for each image in a time-lapse series. Then, a matching between the centroids, which have the maximal number of pairs, is sought between consecutive point sets by a 3-D extension of a two-dimensional fast point pattern matching method, which is invariant to rotation, translation, local distortion, and extra/missing points. The proposed 3-D extension assumes rotations only around the z axis to retain the complexity of the original method. The final step involves computing the optimal fully 3-D transformation between images from corresponding points in the least-squares manner. The robustness of the method was evaluated on generated data. The results of the simulations show that the method is very precise and its correctness can be estimated. This article also presents two practical application examples, namely the registration of images of HP1 domains and the registration of images of telomeres. More than 97% of time-consecutive images were successfully registered. The results show that the method is very well suited to live cell imaging. 相似文献
25.
Vladimír Zivica 《Bulletin of Materials Science》2003,26(6):605-608
Reinforced concrete structures during their exploitation may be exposed to the common action of carbonation and chlorides
causing corrosion of steel reinforcement. Therefore, the related data seem to be interesting and important when the evaluation
of the service life of the structures is the object of interest. This fact was a motivation for the present experimental study
on the sequence of action of chloride solutions and carbonation of the embedding concrete. The results obtained show that
carbonation of concrete foregoing the action of chloride solutions may intensify the process of corrosion of steel reinforcement
in comparison to the converse sequence of the action of mentioned media. At the same time the natrium chloride solution has
been shown as a more aggressive medium opposite to the calcium and magnesium chloride solutions. 相似文献
26.
27.
28.
29.
A new non-iterative method for a parametric study of a particular distillation column is devised. The technique takes use of the similarity between difference and differential equations. For solution of nonlinear boundary value problems for difference equations the GPM technique is used. The method is illustrated by calculated examples. 相似文献
30.
Zusammenfassung Für die N?herungsberechnung des eindimensionalen Temperaturausgleichs in der ebenen Platte, dem unendlich langen Zylinder
und der Kugel wurden mit Hilfe einer elektronischen Rechenmaschine die Fehler, mit denen die Ergebnisse der Rechnung für Biotzahlen
vonBi≦100 und beliebige Fourierzahlen behaftet sind, bestimmt und die bisherigen Schrifttumsangaben pr?zisiert.
Mitteilung aus dem Forschungsinstitut für Chemiefasern, Svit, Tschechoslowakei. über das Thema wurde auf der Konferenz für
Verfahrenstechnik CHISA, Stary Smokovec, Oktober 1971, vorgetragen. 相似文献