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161.
Jorge Ignacio CISNEROS-SALDANA Seyedmohammadhossein HOSSEINIAN Sergiy BUTENKO 《工程管理前沿(英文版)》2018,5(4):533
This study aims to find appropriate locations for wind farms that can maximize the overall energy output while controlling the effects of wind speed variability. High wind speeds are required to obtain the maximum possible power output of a wind farm. However, balancing the wind energy supplies over time by selecting diverse locations is necessary. These issues are addressed using network-based models. Hence, actual wind speed data are utilized to demonstrate the advantages of the proposed approach. 相似文献
162.
Jens Ribbe Guido Schmitz Dmitriy Gunderov Yuri Estrin Yaron Amouyal Gerhard Wilde Sergiy V. Divinski 《Acta Materialia》2013,61(14):5477-5486
Percolating porosity as a specific type of deformation-induced was discovered in ultrafine-grained (UFG) Cu produced by equal channel angular pressing (Ribbe et al., Phys Rev Lett 2009;102:165501). The stability of this defect type against annealing under various conditions is investigated for UFG Cu of different purity levels. The porosity is found to withstand the annealing treatments up to 1073 K for several hours in purified Ar atmosphere, despite significant microstructure transformation. Annealing at 1313 K in Ar removes the percolating porosity, as do relatively short heat treatments at 427 K in a hydrogen-containing atmosphere. Quasi-hydrostatic pressure applied at moderate temperatures, e.g. 1 GPa at 423 K, eliminates the percolating porosity, too. A model of porosity evolution, which accounts for the experimental findings, is suggested. 相似文献
163.
Correlation between the performance and microstructure of Ti/Al/Ti/Au Ohmic contacts to p-type silicon nanowires 总被引:1,自引:0,他引:1
Understanding the electrical and microstructural aspects of contact formation at nanoscale is essential for the realization of low-resistance metallization suitable for the next generation of nanowire based devices. In this study, we present detailed electrical and microstructural characteristics of Ti/Al/Ti/Au metal contacts to p-type Si nanowires (SiNWs) annealed at various temperatures. Focused ion beam cross-sectioning techniques and scanning transmission electron microscopy (STEM) were used to determine the microstructure of the source/drain metal contacts of working SiNW field-effect transistors (FETs) annealed for 30 s in the 450-850?°C temperature range in inert atmosphere. Formation of titanium silicides is observed at the metal/semiconductor interface after the 750?°C anneal. Extensive Si out-diffusion from the nanowire after the 750?°C anneal led to Kirkendall void formation. Annealing at 850?°C led to almost complete out-diffusion of Si from the nanowire core. Devices with 550?°C annealed contacts had linear electrical characteristics; whereas the devices annealed at 750?°C had the best characteristics in terms of linearity, symmetric behavior, and yield. Devices annealed at 850?°C had poor yield, which can be directly attributed to the microstructure of the contact region observed in STEM. 相似文献
164.
Sergiy A. Vilkomir David L. Parnas Veena B. Mendiratta Eamonn Murphy 《Quality and Reliability Engineering International》2008,24(4):447-465
This paper presents the segregated failures model (SFM) of availability of fault‐tolerant computer systems with several recovery procedures. This model is compared with a Markov chain model and its advantages are explained. The basic model is then extended for the situation when the coverage factor is unknown and the failure escalation rates must be used instead. A simple practical analytical approach to availability evaluation is provided and illustrated in detail by estimating the availability of two versions of a reliable clustered computing architecture. For these examples, numeric values of availability indexes are computed and the contribution of each recovery procedure to total system availability is analysed. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
165.
The pH-responsive nanoparticles were coupled with information-processing enzyme-based systems to yield "smart" signal-responsive hybrid systems with built-in Boolean logic. The enzyme systems performed AND/OR logic operations, transducing biochemical input signals into reversible structural changes (signal-directed self-assembly) of the nanoparticle assemblies, thus resulting in the processing and amplification of the biochemical signals. The hybrid system mimics biological systems in effective processing of complex biochemical information, resulting in reversible changes of the self-assembled structures of the nanoparticles. The bioinspired approach to the nanostructured morphing materials could be used in future self-assembled molecular robotic systems. 相似文献
166.
This review presents recent developments in the field of the highly branched molecules (excluding dendrimers) with emphasis on their surface behavior, microstructure, surface morphology, and properties. In our consideration, we included popular types of highly branched molecules, such as star molecules with multiple arms, brush macromolecules of different kinds, and hyperbranched molecules, many of them available in relatively large quantities, which is crucial for future applications. 相似文献
167.
Park YS Liz-Marzán LM Kasuya A Kobayashi Y Nagao D Konno M Mamykin S Dmytruk A Takeda M Ohuchi N 《Journal of nanoscience and nanotechnology》2006,6(11):3503-3506
Silica-coated gold (Au) nanoparticles were prepared and their morphological and X-ray absorption properties were investigated. These core-shell type nanoparticles are very stable in aqueous media and may be suitable for an X-ray contrast agent in biological systems. Transmission electron micrographs confirmed well-separated and relatively homogeneous morphology of the nanoparticles in highly concentrated colloids. Peak position for Au plasmon resonance was red-shifted with increasing shell thickness. X-ray absorption by the colloids of silica-coated Au nanoparticles was stronger than that by those of silica-coated Agl nanoparticles, a recently investigated X-ray contrast agent, at similar experimental conditions. 相似文献
168.
Victor M. Torres III Sergiy Kalnaus Steve W. Martin Caitlin Duggan Andrew S. Westover 《Journal of the American Ceramic Society》2023,106(11):6565-6576
The glassy solid electrolyte Lithium phosphorous oxynitride (LiPON) has been widely researched in thin film solid state battery format due to its outstanding stability when cycled against lithium. In addition, recent reports show thin film LiPON having interesting mechanical behaviors, especially its ability to resist micro-scale cracking via densification and shear flow. In the present study, we have produced bulk LiPON glasses with varying nitrogen contents by ammonolysis of LiPO3 melts. The resulting compositions were determined to be LiPO3-3z/2Nz, where 0 ≤ z ≤ 0.75, and the z value of 0.75 is among the highest ever reported for this series of LiPON glasses. The short-range order structures of the different resulting compositions were characterized by infrared, Raman, 31P magic angle spinning nuclear magnetic resonance, and X-ray photoelectron spectroscopies. Instrumented nano-indentation was used to measure mechanical properties. It was observed that similar to previous studies, both trigonally coordinated (Nt) and doubly bonded (Nd) N co-exist in the glasses in about the same amounts for z ≤ 0.36, the limit of N content in most previous studies. For glasses with z > 0.36, it was found that the fraction of the Nt increased significantly while the fraction of Nd correspondingly decreased. The incorporation of nitrogen increased both the elastic modulus and hardness of the glass by approximately a factor of 1.5 when N/P ratio reaches 0.75. At the same time, an apparent embrittlement of the glass was observed due to nitridation, which was revealed by nanoindentation with an extra sharp nanoindenter tip. 相似文献
169.
Philipp Grohn Luca Schaedler Aitor Atxutegi Prof. Stefan Heinrich Prof. Sergiy Antonyuk 《化学,工程师,技术》2023,95(1-2):244-255
The fluidization behavior of cylindrical particles in a spouted bed was first investigated experimentally using a camera setup. The obtained average spouted bed height was used to evaluate the accuracy of different drag models in CFD-DEM simulations with the superquadric approach to model the particle shape. The drag model according to Sanjeevi et al. showed the best agreement. With this model, cylindrical particles were simulated in a rotor granulator and the particle dynamics were compared with the fluidization of volume equivalent spherical particles. 相似文献