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71.
The segmentation of handwritten digit strings into isolated digits remains a challenging task. The difficulty for recognizing handwritten digit strings is related to several factors such as sloping, overlapping, connecting and unknown length of the digit string. Hence, this paper aims to propose a segmentation and recognition system for unknown-length handwritten digit strings by combining several explicit segmentation methods depending on the configuration link between digits. Three segmentation methods are combined based on histogram of the vertical projection, the contour analysis and the sliding window Radon transform. A recognition and verification module based on support vector machine classifiers allows analyzing and deciding the rejection or acceptance each segmented digit image. Moreover, various submodules are included leading to enhance the robustness of the proposed system. Experimental results conducted on the benchmark dataset show that the proposed system is effective for segmenting handwritten digit strings without prior knowledge of their length comparatively to the state of the art. 相似文献
72.
When navigating in an unknown environment for the first time, a natural behavior consists on memorizing some key views along
the performed path, in order to use these references as checkpoints for a future navigation mission. The navigation framework
for wheeled mobile robots presented in this paper is based on this assumption. During a human-guided learning step, the robot
performs paths which are sampled and stored as a set of ordered key images, acquired by an embedded camera. The set of these
obtained visual paths is topologically organized and provides a visual memory of the environment. Given an image of one of
the visual paths as a target, the robot navigation mission is defined as a concatenation of visual path subsets, called visual
route. When running autonomously, the robot is controlled by a visual servoing law adapted to its nonholonomic constraint.
Based on the regulation of successive homographies, this control guides the robot along the reference visual route without
explicitly planning any trajectory. The proposed framework has been designed for the entire class of central catadioptric
cameras (including conventional cameras). It has been validated onto two architectures. In the first one, algorithms have
been implemented onto a dedicated hardware and the robot is equipped with a standard perspective camera. In the second one,
they have been implemented on a standard PC and an omnidirectional camera is considered.
相似文献
Youcef MezouarEmail: |
73.
Benmouna Youcef Mezmaz Mohand Said Mahmoudi Said Chikh Med Amine 《Pattern Analysis & Applications》2020,23(2):897-911
Pattern Analysis and Applications - Bayesian networks (BNs) are one of the most commonly used models for representing uncertainty in medical diagnosis. Learning the exact structure of a BN is a... 相似文献
74.
Vasudevan Pillai R. Remya Rajendran Jose Varghese Sundararajan Parani El Hadji Mamour Sakho Oluwatobi S. Oluwafemi Sabu Thomas 《应用聚合物科学杂志》2021,138(10):49985
In this work, we have successfully synthesized epoxidized poly(styrene-block-butadiene-block-styrene) with the highest epoxidation degree (55 mol%) for the first time by using metachloroperbenzoic acid method. This highly epoxidized styrene-butadiene-styrene (eSBS) block copolymer exhibited good compatibility with the epoxy (diglycidylether of bisphenol-A)/ eSBS block copolymer- 4,4′-diamino diphenyl methane blend. Transmission electron microscope images showed that the eSBS block copolymer formed spherical nanostructure morphology within the blend due to reaction induced phase separation. The addition of eSBS block copolymer in the system significantly improved the wetting parameters such as hydrophilicity, surface free energy, work of adhesion, spreading coefficient and Girifalco-Good's interaction parameter values, which are discussed in detail. The as-prepared self-assembled nanostructured epoxy system will be useful in highly toughened coating applications such as aircraft, automobile, and flooring industries. 相似文献
75.
76.
Youcef Bendjoudi Eric Becker Régis Bigot Abdelaziz Amirat 《The International Journal of Advanced Manufacturing Technology》2017,88(5-8):1187-1201
The present paper focuses on a new concept of evaluation of a performance index of hot forging dies through the combination of a process behaviour model and a reliability approach analysis of the forging process. The process behaviour is modelled and simulated using the computer-aided engineering FORGE® tool that allowed optimizing the forging parameters and determining the stresses and strains together with temperatures during the forging process and also identifying the factors affecting the die life. The respective reliability mechanical model is developed and reliability simulations have been conducted using PHIMECASoft tool in order to evaluate the reliability index β and determine the sensitivity of the variations in the random values of the input parameters of the forging process. The concept of this contribution has been applied to real industrial dies used to forge automotive steering levers produced in the forging workshop of the Ferrovial Company of Annaba in Algeria. The performance index is given by the number of forged parts corresponding to the reliability index of the dies before failure occurs. 相似文献
77.
78.
Jean-Philippe Lanoix Youcef Mammeri Jean-Luc Schmit Michel Lefranc 《Journal of the Royal Society Interface》2021,18(182)
The global pandemic of coronavirus disease 2019 (COVID-19) has challenged healthcare systems worldwide. Lockdown, social distancing, and screening are thought to be the best means of stopping the virus from spreading and thus of preventing hospital capacity from being overloaded. However, it has also been suggested that effective outpatient treatment can control pandemics. We adapted a mathematical model of the beneficial effect of lockdown on viral transmission and used it to determine which characteristics of outpatient treatment would stop an epidemic. The data on confirmed cases, recovered cases, and deaths were collected from Santé Publique France. After defining components of the epidemic flow, we used a Morris global sensitivity analysis with a 10-level grid and 1000 trajectories to determine which of the treatment parameters had the largest effect. Treatment effectiveness was defined as a reduction in the patients'' contagiousness. Early treatment initiation was associated with better disease control—as long as the treatment was highly effective. However, initiation of a treatment with a moderate effectiveness rate (5%) after the peak of the epidemic was still better than poor distancing (i.e. when compliance with social distancing rules was below 60%). Even though most of today''s COVID-19 research is focused on inpatient treatment and vaccines, our results emphasize the potentially beneficial impact of even a moderately effective outpatient treatment on the current pandemic. 相似文献
79.
Youcef Khodja Abdelraouf Guersi Noureddine Saadi Mohamed Nacer Boutasseta Nadir 《The International Journal of Advanced Manufacturing Technology》2020,106(5):1737-1751
The International Journal of Advanced Manufacturing Technology - In this paper, we propose a novel method for the classification of bearing faults using a convolutional neural network (CNN) and... 相似文献
80.
Fatiha Youcef Ettoumi Abd El Hamid Adane Mohamed Lassaad Benzaoui Nabila Bouzergui 《Renewable Energy》2008,33(10):2333-2338
In this paper, five typical regions of Algeria where wind is strong enough are selected. These regions usually intended for traditional agriculture are, centred around the towns of Guelma, El Oued, Tindouf, Touggourt and Tamanrasset. To make wind energy conversion available as an alternative energy source for the populations living in such countries, nine types of small and medium wind turbines constructed by American and European manufacturers are studied for their suitability. To account for the wind variations with height, four possible heights of the pylon holding the turbines are considered: 10, 20, 40 and 60 m. In each of the five locations and at each pylon height, wind energy converted by the turbines, is cumulated over the year and computed. Depending on the site and their size, most of these turbines are found to produce about 1000–10,000 MWh of electricity per year at 60 m of altitude and can easily satisfy the electricity need in irrigation and its household applications in rustic and arid regions. A quick glance of the results of the above computation shows that the choice of pylons of 20 m height yields a trade-off between the production of electrical energy and the requirements of economy. Owing to the sporadic wind variations, wind energy conversion systems can only be used as an auxiliary source. In particular, these systems can advantageously be coupled to stand-alone photovoltaic conversion systems in remote locations or connected to the electric mains in urban zones. 相似文献