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We present two new classifiers for two-class classification problems using a new Beta-SVM kernel transformation and an iterative
algorithm to concurrently select the support vectors for a support vector machine (SVM) and the hidden units for a single
hidden layer neural network to achieve a better generalization performance. To construct the classifiers, the contributing
data points are chosen on the basis of a thresholding scheme of the outputs of a single perceptron trained using all training
data samples. The chosen support vectors are used to construct a new SVM classifier that we call Beta-SVN. The number of chosen
support vectors is used to determine the structure of the hidden layer in a single hidden layer neural network that we call
Beta-NN. The Beta-SVN and Beta-NN structures produced by our method outperformed other commonly used classifiers when tested
on a 2-dimensional non-linearly separable data set. 相似文献
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N.A. Oladoja I.A. OloladeO.A. Alimi T.A. AkinnifesiG.A. Olaremu 《Chemical Engineering Research and Design》2013
An environmentally benign metal oxide, Fe, was incorporated into silica derived from rice husk via the sol gel route and the physiognomies of both the modified (IRS) and raw rice husk derived silica (RHS) were studied via FTIR and XRD analysis and pHPZC and surface area determinations. The stability of the Fe incorporated into the silica matrix, determined via the toxicity characteristic leaching procedure, showed that the integrity of the sorbent was intact only in basic medium but got vitiated in acidic medium. The sorption process conformed to the pseudo second order model than reversible first order and pseudo first order kinetic models and the rate of sorption of Cr(VI) onto either sorbents was determined by film diffusion. Process variables optimization showed that the amount of Cr(VI) removed per gram of sorbent reduced with increase in initial solution pH and the negative impact of the anionic interference was more in the presence of SO32− than NO32− and Cl−. The predicted Langmuir monolayer sorption capacity (mg/g) of the IRS (63.69) was higher than that of the RHS (61.35). The value of the mean free energy (kJ/mol) of sorption, obtained for IRS (267.26) and RHS (100.00), and the significant changes in the peak positions of specific functional groups on the Cr(VI) laden sorbents showed that chemisorption was the dominant mechanism of Cr(VI) uptake. 相似文献
5.
Mohamed Masmoudi Mounir Samet Adel M. Alimi 《International Journal of Electronics》2013,100(6):675-682
The great flexibility of the Beta function and its universal approximation characteristics, make Beta basis function neural networks (BBFNNs) very useful. We present a hardware implementation of the Beta neuron. The proposed circuit was designed by using a standard bipolar technology. PSPICE simulations show the good concordance of the output of our circuit with the analytic Beta function. We also successfully integrated the electronic Beta neuron in the design of a BBFNN that approximates a nonlinear mapping. 相似文献
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Mounir Samet Samet Mohamed Masmoudi Adel M. Alimi 《International Journal of Electronics》2013,100(6):645-657
Beta basis function neural networks (BBFNNs) are powerful systems for learning and universal approximation. In this paper, we present a hardware implementation of the Beta neuron using the CMOS subthreshold mode. We describe the low power–low voltage analogue Beta neuron circuit. Three main modules are used to realize the electronic Beta function: a logarithmic currentto-voltage converter, a multiplier and an exponential voltage-to-current converter. Simulation results show the validity of our neural hardware implementation. The parameters of the electronic Beta function are controlled independently by current sources. This analogue implementation could be used easily to realize analogue BBFNNs. 相似文献
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Surgical treatment of incompetent perforating veins of the leg is best carried out through a sub-aponeurotic approach after localisation by coloured Duplex-Scanning. Open techniques are long established. When there is only one perforator, a short 5 cm approach is centred over the previously localised perforator. In the presence of multiple perforators, an extensive approach is necessary. This usually means a single long incision, situated para-tibially in the Linton approach, postero-medially in the Dodd approach or posteriorly in the Felder approach. The advantage of the last two approaches is that they are situated at a distance from any eventual cutaneous lesion. The approach can also be through several separate oblique incisions (De Palma). More recently introduced, endoscopic techniques have the advantage of reducing the incidence of cutaneous complications such as necrosis or infections and of shortening the duration of hospitalisation. Some authors work with re-usable instruments. The perforators are divided after coagulation (Hauer, Sattler). Others use disposable instruments, insufflate the sub-aponeurotic space and clip the perforators to prevent bleeding (Gloviczki). These techniques are currently undergoing evaluation. 相似文献
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Résumé. Un essai de longue durée est réalisé sur un matériau d'étanchéité, l'argile du Gault. Par une infiltration continue du lixiviat
de scories, sous une charge hydraulique constante de 98,5 cm, nous avons suivi la variation spatio-temporelle de l'humidité
θ
(z, t) et de la conductivité électrique σ
(z, t) dans une colonne du sol. La relation entre la teneur en eau volumique (θ) et la constante diélectrique (ε) du sol est établie
en utilisant la méthode TDR. Nous avons également établi une relation entre la fraction soluble de la solution et sa conductivité
électrique. Cette relation permet de suivre la distribution spatio-temporelle du soluté dans la couche de sol. Plusieurs chercheurs
ont montré qu'il est possible de tracer les courbes d'élution d'un traceur non réactif en utilisant la méthode TDR. Cette
méthode permet alors d'éviter l'utilisation des bougies poreuses d'extraction des solutions du sol et les analyses chimiques
co?teuses de l'éluant. Les résultats des essais d'infiltration effectués sur la couche d'argile montrent que la conductivité
électrique mesurée à l'aide des sondes TDR sert à localiser la fraction soluble dans la colonne. Le coefficient de dispersion
calculé est resté constant au cours du temps autour d'une valeur moyenne de 1,5×10–10 m2/s. Ce qui montre que le coefficient de dispersion n'est pas très influencé par le sol et par son degré de saturation.
Electronic Publication 相似文献
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