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排序方式: 共有52条查询结果,搜索用时 328 毫秒
1.
Asunción Vicente M Hoyer PO Hyvärinen A 《IEEE transactions on pattern analysis and machine intelligence》2007,29(5):896-900
Recently, a number of empirical studies have compared the performance of PCA and ICA as feature extraction methods in appearance-based object recognition systems, with mixed and seemingly contradictory results. In this paper, we briefly describe the connection between the two methods and argue that whitened PCA may yield identical results to ICA in some cases. Furthermore, we describe the specific situations in which ICA might significantly improve on PCA 相似文献
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3.
Silylcupration of multiple bonds (allenes, acetylenes, dienes, and styrenes) has become one of the most efficient procedures for the synthesis of vinyl- and allylsilanes. These substrates are useful building blocks in organic synthesis since they undergo a great variety of silicon-assisted transformations. The methodology reported has been widely used in the synthesis of different natural products, as well as in the construction of carbo- and heterocycles. In this Account, we wish to illustrate our contribution to this field, as well as to highlight the contributions of others. 相似文献
4.
Raúl García-Castro Asunción Gómez-Pérez 《Engineering Applications of Artificial Intelligence》2013,26(4):1413-1420
The conformance of semantic technologies has to be systematically evaluated to measure and verify the real adherence of these technologies to the Semantic Web standards. Current evaluations of semantic technology conformance are not exhaustive enough and do not directly cover user requirements and use scenarios, which raises the need for a simple, extensible and parameterizable method to generate test data for such evaluations. To address this need, this paper presents a keyword-driven approach for generating ontology language conformance test data that can be used to evaluate semantic technologies, details the definition of a test suite for evaluating OWL DL conformance using this approach, and describes the use and extension of this test suite during the evaluation of some tools. 相似文献
5.
In this paper, a suitable technique as well as an adequate material for the immobilization of the fungus Rhizopus oryzae were investigated. This organism has been shown to have potential in the field of food aroma due to the production of extracellular lipolytic enzymes. However, an efficient production system at bioreactor scale for its application to the flavor compounds production is still needed. Among the supports studied, alginate beads were the best carrier materials, leading to the highest lipolytic activities of up to 400 U/L after 3 days of cultivation. Repeated batch cultures were carried out to improve cell concentration and lipolytic activity. The gel beads produced lipolytic enzyme under optimized conditions for consecutive batch fermentations without marked activity loss and deformation attained a maximum level of 715 U/L after three batches. The production of lipolytic enzyme by immobilized Rhizopus oryzae in a 2‐litre airlift bioreactor with the optimized conditions was evaluated. Lipolytic activities of 487 U/L were attained, operating in successive batches without operational problems and the bioparticles (the fungus grows in alginate beads) maintained their shape throughout fermentation. 相似文献
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7.
Marc de la Asunción José M. Mantas Manuel J. Castro 《The Journal of supercomputing》2011,58(2):206-214
The numerical solution of shallow water systems is useful for several applications related to geophysical flows, but the big
dimensions of the domains suggests the use of powerful accelerators to obtain numerical results in reasonable times. This
paper addresses how to speed up the numerical solution of a first order well-balanced finite volume scheme for 2D one-layer
shallow water systems by using modern Graphics Processing Units (GPUs) supporting the NVIDIA CUDA programming model. An algorithm
which exploits the potential data parallelism of this method is presented and implemented using the CUDA model in single and
double floating point precision. Numerical experiments show the high efficiency of this CUDA solver in comparison with a CPU
parallel implementation of the solver and with respect to a previously existing GPU solver based on a shading language. 相似文献
8.
Boris Villazón-Terrazas Jaime Ramírez Mari Carmen Suárez-Figueroa Asunción Gómez-Pérez 《Expert systems with applications》2011,38(11):13612-13624
This paper presents the development of a network of ontology networks that enables data mediation between the Employment Services (ESs) participating in a semantic interoperability platform for the exchange of Curricula Vitae (CVs) and job offers in different languages. Such network is formed by (1) a set of local ontology networks that are language dependent, in which each network represents the local and particular view that each ES has of the employment market; and (2) a reference ontology network developed in English that represents a standardized and agreed upon terminology of the European employment market. In this network each local ontology network is aligned with the reference ontology network so that search queries, CVs, and job offers can be mediated through these alignments from any ES. The development of the ontologies has followed the methodological guidelines issued by the NeOn Methodology and is focused mainly on scenarios that involve reusing and re-engineering knowledge resources already agreed upon by employment experts and standardization bodies. This paper explains how these methodological guidelines have been applied for building e-employment ontologies. In addition, it shows that the approach to building ontologies by reusing and re-engineering agreed upon non-ontological resources speeds the ontology development, reduces development costs, and retrieves knowledge already agreed upon by a community of people in a more formal representation. 相似文献
9.
Deteriorating effects of lichen and microbial colonization of carbonate building rocks in the Romanesque churches of Segovia, Spain 总被引:1,自引:0,他引:1
de Los Ríos A Cámara B García Del Cura MA Rico VJ Galván V Ascaso C 《The Science of the total environment》2009,407(3):1123-1134
In this study, the deterioration effects of lichens and other lithobionts in a temperate mesothermal climate were explored. We examined samples of dolostone and limestone rocks with visible signs of biodeterioration taken from the exterior wall surfaces of four Romanesque churches in Segovia (Spain): San Lorenzo, San Martín, San Millán and La Vera Cruz. Biofilms developing on the lithic substrate were analyzed by scanning electron microscopy. The most common lichen species found in the samples were recorded. Fungal cultures were then obtained from these carbonate rocks and characterized by sequencing Internal Transcribed Spacers (ITS). Through scanning electron microscopy in back-scattered electron mode, fungi (lichenized and non-lichenized) were observed as the most frequent microorganisms occurring at sites showing signs of biodeterioration. The colonization process was especially conditioned by the porosity characteristics of the stone used in these buildings. While in dolostones, microorganisms mainly occupied spaces comprising the rock's intercrystalline porosity, in bioclastic dolomitized limestones, fungal colonization seemed to be more associated with moldic porosity. Microbial biofilms make close contact with the substrate, and thus probably cause significant deterioration of the underlying materials. We describe the different processes of stone alteration induced by fungal colonization and discuss the implications of these processes for the design of treatments to prevent biodeterioration. 相似文献
10.
Human milk samples from three healthy donors were investigated in order to evaluate the antibacterial activity during lactation against Escherichia coli ATCC 25922 and Listeria monocytogenes. The concentration of the main human-milk antimicrobial proteins (lactoferrin (LF), lysozyme (LZ) and secretory immunoglobulin A (sIgA)) was determined by ELISA. Results showed that human milk exhibited antibacterial activity against List. monocytogenes, although it was weakly active against Esch. coli ATCC 25922. The observed antilisterial activity was positively correlated with LZ concentration. In addition, the effect of gastrointestinal proteases, at different pH conditions, that prevail in the stomach of infants (pH 2.0-6.5), on antilisterial activity and protein degradation was evaluated. Hydrolysis with pepsin at pH 4.0-6.5, followed by treatment with pancreatic enzymes, resulted in a decreased hydrolysis of LZ, LF and sIgA and an enhanced antibacterial activity against List. monocytogenes. It is suggested that partial degradation of certain milk proteins at the gastrointestinal level may produce peptides that could act synergistically with the remnant intact proteins. 相似文献