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排序方式: 共有332条查询结果,搜索用时 15 毫秒
1.
To determine if the sexually dimorphic area (SDA) of the gerbil hypothalamus affects male sexual behavior through its projections to the retrorubral field (RRF) or ventrolateral periaqueductal gray (PAGvl), these pathways were lesioned asymmetrically. Unilateral radio frequency lesions of the lateral SDA (LSDA), the major source of the pathways, impaired mating when combined with contralateral RRF, but not PAGvl, lesions. N-methyl-{d}-aspartate (NMDA) lesions of the medial SDA, LSDA, and the area between them (the total pathway source) eliminated mating when combined with contralateral, but not ipsilateral, NMDA lesions of the RRF. To determine if A8 cells contributed to these effects, males received NMDA in the SDA and NMDA or 6-hydroxydopamine in the contralateral RRF. When combined with large SDA lesions, A8 lesions impaired but did not eliminate mating. Thus the SDA–RRF pathway, but not an SDA-A8 pathway, is essential for sexual behavior in male gerbils. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
2.
Stephen J. Allen Pauline A. Brown 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1995,62(1):17-24
The adsorption of the three metal ions, copper, cadmium and zinc in single component and multi-component mixtures in aqueous solutions by lignite is reported. A comparison is made between the single component saturation uptake and the multi-component uptakes. The isotherms indicate a competitive uptake with copper being preferentially absorbed by the lignite in multi-component solutions. The isotherms are plotted to obtain the Langmuir constants, the Freundlich constants and the Redlich–Peterson constants. Lignite is shown to possess an affinity for the metal ions which make its use as an adsorbent a possible alternative to the use of more expensive activated carbons. 相似文献
3.
We address the problem of adaptive output-feedback stabilization of general first-order hyperbolic partial integro-differential equations (PIDE). Such systems are also referred to as PDEs with non-local (in space) terms. We apply control at one boundary, take measurements on the other boundary, and allow the system’s functional coefficients to be unknown. To deal with the absence of both full-state measurement and parameter knowledge, we introduce a pre-transformation (which happens to be based on backstepping) of the system into an observer canonical form. In that form, the problem of adaptive observer design becomes tractable. Both the parameter estimator and the control law employ only the input and output signals (and their histories over one unit of time). Prior to presenting the adaptive design, we present the non-adaptive/baseline controller, which is novel in its own right and facilitates the understanding of the more complex, adaptive system. The parameter estimator is of the gradient type, based on a parametric model in the form of an integral equation relating delayed values of the input and output. For the closed-loop system we establish boundedness of all signals, pointwise in space and time, and convergence of the PDE state to zero pointwise in space. We illustrate our result with a simulation. 相似文献
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Pauline F. Heathcote 《History of Photography》2013,37(2):99-112
Abstract Samuel Bourne was one of the great pioneers of travel photography, and the photographs which he took in India during the 1860s have become familiar to a wide audience through their inclusion in exhibitions, their use as book illustrations and also through television coverage. Although acknowledging the merit of that aspect of his work, this paper discusses the hitherto comparatively little-known role which he played in the arena of photography during the period immediately before he went to India, and also his activities in the latter part of the 19th and early 20th centuries. 相似文献
6.
Pauline Hibon Heinz von Seggern Hsin-Rong Tseng Christoph Leonhard Manuel Hamburger Gaëlle Béalle 《应用聚合物科学杂志》2020,137(29):48895
Interface control remains a top challenge of solution-processed organic light emitting diodes (OLED) stacks since the device performance heavily relies on it. Film stability of an inkjet deposited and crosslinked layer against subsequent exposure to a suitable inkjet printed solvent has been investigated. Impact of processing solvent (solvent used to prepare the polymer layer) on solution-cast thin film properties has already been shown for polymer films. To our knowledge, this study is the first one analyzing thin films stability against solvent exposure using technology relevant materials processed via inkjet printing (IJP). The outcome of this research showed that the stability of the crosslinked films is affected by the solvent used for ink formulation. These findings are of great interest for multilayered semiconductors devices, such as OLEDs, field-effect transistors and dye-sensitized solar cells. Differential scanning calorimetry (DSC) was used to quantify the efficiency of the polymer crosslinking reaction in pure powder and in thin films, as processed from different solvents. Crosslinking efficiency measured by DSC correlated well with the deformation induced by the solvent and observed on layer surfaces. The interaction in solution between polymer and solvent has also been evaluated to explain its impact on thin film stability against successive solvent printing. © 2020 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48895. 相似文献
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8.
Joaquín M. Azagra-Caro Ignacio Fernández-de-Lucio François Perruchas Pauline Mattsson 《Scientometrics》2009,80(2):441-455
Most studies of patents citations focus on national or international contexts, especially contexts of high absorptive capacity,
and employ examiner citations. We argue that results can vary if we take the region as the context of analysis, especially
if it is a region with low absorptive capacity, and if we study applicant citations and examiner-inserted citations separately.
Using a sample from the Valencian Community (Spain), we conclude that (i) the use of examiner-inserted citations as a proxy
for applicant citations, (ii) the interpretation of non-patent references as indicators of science-industry links, and (iii)
the traditional results for geographical localization are not generalizable to all regions with low absorptive capacity. 相似文献
9.
Evolutionary techniques may be applied to search for specific structures or functions, as specified in the fitness function.
This paper addresses the challenge of finding an appropriate fitness function when searching for generic rather than specific
structures which, when combined wiacteristic of defect tolerance on the circuit. Production defects for integrated circuits
are expected to increase considerably. To avoid a corresponding drop in yield, improved defect tolerance solutions are needed.
In the case of Field Programmable Gate Arrays (FPGAs), the pre-designed gate array provides a bridge between production and
the application designers. Thus, introduction of defect tolerant techniques to the FPGA itself could provide a defect free
gate array to the application designer, despite production defects. The search for defect tolerance presented herein is directed
at finding defect tolerant structures for an important building block of FPGAs: Look-Up Tables (LUTs). Two key approaches
are presented: (1) applying evolved generic building blocks to a traditional LUT design and (2) evolving the LUT design directly.
The results highlight the fact that evolved generic defect tolerant structures can contribute to highly reliable circuit designs
at the expense of area usage. Further, they show that applying such a technique, rather than direct evolution, has benefits
with respect to evolvability of larger circuits, again at the expense of area usage. 相似文献
10.