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11.
In this paper, a single-item capacitated lot-sizing problem in a flow-shop system with energy consideration is studied. The planning horizon is defined by a set of periods where each one is characterised by a length, an allowed maximal power, an electricity price, a power price and a demand. The objective is to determine the quantities to be produced by each machine at each period while minimising the production cost in terms of electrical, inventory, set-up and power required costs. For medium- and large-scale problems, lot-sizing problems are hard to solve. Therefore, in this study, two heuristics are developed to solve this problem in a reasonable time. To evaluate the performances of these heuristics, computational experiments are presented and numerical results are discussed and analysed. 相似文献
12.
Matthieu Fortin‐Deschênes Robert M. Jacobberger Charles‐Antoine Deslauriers Olga Waller tienne Bouthillier Michael S. Arnold Oussama Moutanabbir 《Advanced materials (Deerfield Beach, Fla.)》2019,31(21)
Van der Waals (vdW) heterostructures have recently been introduced as versatile building blocks for a variety of novel nanoscale and quantum technologies. Harnessing the unique properties of these heterostructures requires a deep understanding of the involved interfacial interactions and a meticulous control of the growth of 2D materials on weakly interacting surfaces. Although several epitaxial vdW heterostructures have been achieved experimentally, the mechanisms governing their synthesis are still nebulous. With this perspective, herein, the growth dynamics of antimonene on graphene are investigated in real time. In situ low‐energy electron microscopy reveals that nucleation predominantly occurs on 3D nuclei followed by a self‐limiting lateral growth with morphology sensitive to the deposition rate. Large 2D layers are observed at high deposition rates, whereas lower growth rates trigger an increased multilayer nucleation at the edges as they become aligned with the Z2 orientation leading to atoll‐like islands with thicker, well‐defined bands. This complexity of the vdW growth is elucidated based on the interplay between the growth rate, surface diffusion, and edges orientation. This understanding lays the groundwork for a better control of the growth of vdW heterostructures, which is critical to their large‐scale integration. 相似文献
13.
Oussama Ben Haj Belkacem Mohamed Lassaad Ammari Rafik Zayani Ridha Bouallegue 《Transactions on Emerging Telecommunications Technologies》2015,26(9):1119-1130
In this paper, we focus on the effect of nonlinear high‐power amplifiers (HPA) on the multiple‐input‐multiple‐output space‐time block coded (MIMO‐STBC) systems. In order to compensate the HPA nonlinearity, we propose a new receiver scheme based on a neural network algorithm in conjunction with the maximal‐ratio combining (MRC) technique. The performances of the proposed nonlinear network (NLN), called NLN‐MRC receiver, are evaluated for a MIMO‐STBC systems over uncorrelated Rayleigh fading channels. Analytic expressions of the average symbol error rate and the error vector magnitude are delivered. We also analyse the channel capacity of the considered system assuming the perfect knowledge of the channel coefficients and the use of the water‐filling approach. Simulation results show that the proposed compensation technique can efficiently reduce the effect of HPA distortions. In addition, we note an excellent agreement between analytic expressions and Monte‐Carlo simulation curves. Furthermore, the proposed adaptive NLN‐MRC scheme has a low complexity, fast convergence, and best performance than its competitors given in the literature. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
14.
Thomas J. Taylor Oussama Elbjeirami Charlotte N. Burress Mitsukimi Tsunoda Martha I. Bodine Mohammad A. Omary François P. Gabbaï 《Journal of Inorganic and Organometallic Polymers and Materials》2008,18(1):175-179
The interaction of the Hg(II) derivatives bis(pentafluoro)phenyl mercury (1), (pentafluoro)phenyl mercury chloride (2) and trimeric perfluoro-ortho-phenylene mercury (3) with tolane (diphenylacetylene) in CH2Cl2 leads to the formation of [1·tolane], [2
2·tolane], and [3·tolane·CH2Cl2]. These adducts have been characterized by elemental analysis, X-ray crystallography, and luminescence spectroscopy. In the
solid state of these adducts, the tolane molecules interact with the molecules of 1, 2 and 3 via secondary Hg–π interactions and arene–fluoroarene interactions. As a result of an external mercury heavy atom effect,
adducts [1·tolane] and [2
2·tolane] are phosphorescent at room temperature. 相似文献
15.
The accurate manipulation of strain in silicon nanowires can unveil new fundamental properties and enable novel or enhanced functionalities. To exploit these potentialities, it is essential to overcome major challenges at the fabrication and characterization levels. With this perspective, we have investigated the strain behavior in nanowires fabricated by patterning and etching of 15 nm thick tensile strained silicon (100) membranes. To this end, we have developed a method to excite the "forbidden" transverse-optical (TO) phonons in single tensile strained silicon nanowires using high-resolution polarized Raman spectroscopy. Detecting this phonon is critical for precise analysis of strain in nanoscale systems. The intensity of the measured Raman spectra is analyzed based on three-dimensional field distribution of radial, azimuthal, and linear polarizations focused by a high numerical aperture lens. The effects of sample geometry on the sensitivity of TO measurement are addressed. A significantly higher sensitivity is demonstrated for nanowires as compared to thin layers. In-plane and out-of-plane strain profiles in single nanowires are obtained through the simultaneous probe of local TO and longitudinal-optical (LO) phonons. New insights into strained nanowires mechanical properties are inferred from the measured strain profiles. 相似文献
16.
Seung‐Mo Lee Vladislav Ischenko Eckhard Pippel Admir Masic Oussama Moutanabbir Peter Fratzl Mato Knez 《Advanced functional materials》2011,21(16):3047-3055
Transition metals incorporated into polymers lead to unusual or improved physical properties that significantly differ from those of purely organic polymers. A simple and practicable incorporation of diverse transition metals into any available polymer would make an important contribution to overcome some of the synthetic difficulties of metal‐polymer hybrid materials. Here, it is demonstrated that atomic layer deposition (ALD) can be a promising means to resolve some of those difficulties. It is found that even polytetrafluoroethylene (PTFE) with its great physical and chemical stability can be easily transformed into a transition metal–PTFE hybrid material simply by applying a metal‐oxide ALD process to PTFE. Upon metal incorporation into the PTFE, the molecular structure as well as mechanical properties (tensile behavior) of PTFE were observed to significantly change. For a better understanding of the changes to the material, experimental investigations using Raman spectroscopy, attenuated‐total‐reflection Fourier‐transform infrared spectroscopy, wide‐angle X‐ray diffraction, and energy‐dispersive X‐ray analysis were performed. In addition, with density functional theory calculations, potential bonding states of the incorporated metal into PTFE were modeled and predicted. The ALD‐based vapor‐phase approach for metal incorporation into a polymer could bring about rapid progress in the research area of metal–polymer hybrid materials. 相似文献
17.
Fayrouz Haddad Wenceslas Rahajandraibe Lakhdar Zaïd Oussama Frioui 《International Journal of Electronics》2013,100(3):319-331
The performance of signal-processing algorithms implemented in hardware depends on the efficiency of datapath, memory speed and address computation. Pattern of data access in signal-processing applications is complex and it is desirable to execute the innermost loop of a kernel in a single-clock cycle. This necessitates the generation of typically three addresses per clock: two addresses for data sample/coefficient and one for the storage of processed data. Most of the Reconfigurable Processors, designed for multimedia, focus on mapping the multimedia applications written in a high-level language directly on to the reconfigurable fabric, implying the use of same datapath resources for kernel processing and address generation. This results in inconsistent and non-optimal use of finite datapath resources. Presence of a set of dedicated, efficient Address Generator Units (AGUs) helps in better utilisation of the datapath elements by using them only for kernel operations; and will certainly enhance the performance. This article focuses on the design and application-specific integrated circuit implementation of address generators for complex addressing modes required by multimedia signal-processing kernels. A novel algorithm and hardware for AGU is developed for accessing data and coefficients in a bit-reversed order for fast Fourier transform kernel spanning over log?2 N stages, AGUs for zig-zag-ordered data access for entropy coding after Discrete Cosine Transform (DCT), convolution kernels with stored/streaming data, accessing data for motion estimation using the block-matching technique and other conventional addressing modes. When mapped to hardware, they scale linearly in gate complexity with increase in the size. 相似文献
18.
Distributed renewable energy sources offer significant alternatives for Qatar and the Arab Gulf region’s future fuel supply and demand. Microgrids are essential for providing dependable power in difficult-to-reach areas while incorporating significant amounts of renewable energy sources. In energy-efficient data centers, distributed generation can be used to meet the facility’s overall power needs. This study primarily focuses on the best energy management practices for a smart microgrid in Qatar while taking demand-side load management into account. This article looked into a university microgrid in Qatar that primarily aimed to get all of its energy from the grid. While diesel generators are categorized as a dispatchable distributed generation with energy storage added to handle solar radiation from the sun and high grid power operating costs in the suggested scenario, wind turbines and solar Photovoltaic (PV) are classified as non-dispatchable distributed generators. The resulting linear math issues are assessed and displayed in MATLAB optimization software using a mixed-integer linear programming (MILP) strategy. According to the simulation results, the suggested energy management strategy reduced the university microgrid’s grid power costs by 38.8%, making it an affordable solution which is somehow greater than the prior case scenario’s 23% savings. The installed solar system capacity’s effects on the economy, society, and finances were also assessed, and it became clear that the best option for the smart microgrid was determined that would be 325 kW of solar PV, 25 kW of wind turbine, and 600 kW of diesel generators, respectively. Given the current situation, university administrators are urged to participate in distributed generators and adopt cutting-edge designs for energy storage technologies due to the significant environmental and financial benefits. 相似文献
19.
Raouf Belgacemi Mehdi Derradji Oussama Mehelli Djalal Trache Wenbin Liu Jun Wang 《Polymer Composites》2021,42(8):3882-3891
In this study, a partially bio-based composite was prepared from a high-performance thermosetting resin, namely the phthalonitrile, and chopped basalt fibers (CBFs). Aiming to create strong covalent bonds between the matrix and the fillers, the CBFs were priorly grafted with an epoxy-ended hyperbranched poly (trimellitic anhydride ethylene glycol) ester (EHBP). The modification technique was validated by infrared spectroscopy and scanning electron microscopy (SEM). The effect of the fillers treatment on the mechanical performances highlighted remarkable enhancements in the tensile, bending, and Charpy impact properties. For instance, the tensile strength and modulus values were 30% and 20% higher than those afforded by the pristine fibers. Meanwhile, the SEM analysis of the fractured surfaces clearly confirmed the excellent state of adhesion and dispersion of the treated fillers with the polymeric matrix. Additionally, the influence of different quantities of EHBP-CBFs on the composite properties further revealed the exceptionally high mechanical properties of the developed materials. In fact, the tensile strength attained exceptional value of about 310 MPa for the composite of 20 wt% of EHBP-CBFs. Overall, this study unraveled the great potential of these newly developed materials with a focus on overcoming the debonding phenomena and easing the stress-transfer between the constituents. 相似文献
20.
Oussama Moutanabbir;Simone Assali;Anis Attiaoui;Gérard Daligou;Patrick Daoust;Patrick Del Vecchio;Sebastian Koelling;Lu Luo;Nicolas Rotaru; 《Advanced materials (Deerfield Beach, Fla.)》2024,36(8):2305703
The p-symmetry of the hole wavefunction is associated with a weaker hyperfine interaction, which makes hole spin qubits attractive candidates to implement quantum processors. However, recent studies demonstrate that hole qubits are still very sensitive to nuclear spin bath, thus highlighting the need for nuclear spin-free germanium (Ge) qubits to suppress this decoherence channel. Herein, this work demonstrates the epitaxial growth of 73Ge- and 29Si-depleted, isotopically enriched 70Ge/silicon-germanium (SiGe) quantum wells. The growth is achieved by reduced pressure chemical vapor deposition using isotopically purified monogermane 70GeH4 and monosilane 28SiH4 with an isotopic purity higher than 99.9% and 99.99%, respectively. The quantum wells consist of a series of 70Ge/SiGe heterostructures grown on Si wafers. The isotopic purity is investigated using atom probe tomography (APT) following an analytical procedure addressing the discrepancies caused by the overlap of isotope peaks in mass spectra. The nuclear spin background is found to be sensitive to the growth conditions with the lowest concentration of 73Ge and 29Si is below 0.01% in the Ge well and SiGe barriers. The measured average distance between nuclear spins reaches 3–4 nm in 70Ge/28Si70Ge, which is an order of magnitude larger than in natural Ge/SiGe heterostructures. The spread of the hole wavefunction and the residual nuclear spin background in APT voluminals comparable to the size of realistic quantum dots are also discussed. 相似文献