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  • Articles  (2,269)
  • Institute of Electrical and Electronics Engineers (IEEE)  (1,177)
  • Springer  (1,092)
  • American Geophysical Union
  • National Academy of Sciences
  • 2015-2019  (2,269)
  • 2005-2009
  • 1990-1994
  • 2017  (2,269)
  • IEEE Communications Magazine  (593)
  • IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing  (584)
  • Applied Physics A  (322)
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  • Articles  (2,269)
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  • 2015-2019  (2,269)
  • 2005-2009
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  • 1
    Publication Date: 2017-03-18
    Description: In the present study, various cap rocks have been experimentally reacted in water with supercritical CO 2 in geological storage conditions ( P  = 8 × 10 6  Pa and T  = 80 °C) for 25 days. To characterize the potential CO 2 –water–rock interactions, an experimental setup has been built to provide additional information concerning the effects of structure, thermal and surface characteristics changes due to CO 2 injection with cap rocks. In addition, CO 2 adsorption capacities of different materials (i.e., clay evaporate and sandstone) are measured. These samples were characterized by XRD technique. The BET specific surface area was determined by nitrogen isotherms. In addition, thermal characteristics of untreated adsorbents were analyzed via TGA method and topography surfaces are identified by Scanning Electron Microscope (SEM). Taking into account pressure and temperature, the physical as well as chemical mechanisms of CO 2 retention were determined. Isotherm change profiles of samples for relative pressure range indicate clearly that CO 2 was adsorbed in different quantities. In accordance with the X-ray diffraction, a crystalline phase was formed due to the carbonic acid attack and precipitation of some carbonate.
    Print ISSN: 0947-8396
    Electronic ISSN: 1432-0630
    Topics: Technology , Physics
    Published by Springer
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  • 2
    Publication Date: 2017-03-18
    Description: To obtain a desired performance of non-volatile memory applications, heterojunction-based resistive switching devices have tremendous attractions. In this paper, we demonstrate resistive switching characteristics for heterojunction of poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS)/poly(4-vinylphenol) (PVP) composite and methyl red sandwiched in between bottom and top silver (Ag) electrodes. The proposed heterojunction layers are fabricated through spin coater at 3000 rpm for 60 s each, and the Ag electrodes are deposited through a commercialized inkjet printer DMP-3000 on polyethyleneterephthalate (PET) substrate. To verify the proposed device, the resistive switching on dual polarity voltage of ±10.2 V is measured over more than 500 endurance cycles. The paper also presents an R off / R on ratio which can adjust through an active layer’s area and a blending ratio of the PEDOT:PSS and PVP. By applying the area of 100 μm 2 and the blending ratio of 3:1, we achieve the higher R off / R on ratio of 121, and its high resistance state (HRS) and low resistance state (LRS) are observed as 3000 kΩ and 24.7 kΩ, respectively. To maintain a long retention time, the device is encapsulated with PDMS, which changes a little variations of 52 Ω for HRS 498 Ω for LRS over 60 days. For the flexible realization to be utilized in wearable applications, it can be easily applied on a plastic substrate using printed technologies.
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    Electronic ISSN: 1432-0630
    Topics: Technology , Physics
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  • 3
    Publication Date: 2017-03-22
    Description: In this paper, the vibrational characteristics of zigzag phosphorene nanotubes are investigated by using a three-dimensional finite element model. The beam elements are used to simulate the P–P bonds in the structure of the phosphorene nanotubes. The elastic properties of the beam elements are computed from the similarity of energy terms in the molecular and structural mechanics. Besides, mass elements are located at the place of the atoms. Considering the zigzag phosphorene nanotubes with different diameters, it is shown that the effect of the diameter on the first natural frequencies of the nanotubes can be neglected. However, this effect increases for higher modes. Besides, at the same diameter, the zigzag phosphorene nanotubes with larger aspect ratios (length/diameter) have smaller frequencies.
    Print ISSN: 0947-8396
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    Topics: Technology , Physics
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  • 4
    Publication Date: 2017-03-22
    Description: Cobalt oxide (Co 3 O 4 ) nanoparticles were synthesized using precipitation method. The X-ray diffraction (XRD) pattern was used to determine the structure of Co 3 O 4 nanoparticles. The presence of Co 3 O 4 nanoparticles was confirmed by the FTIR spectrum. The fact about the surface morphology of Co 3 O 4 nanoparticles was revealed by scanning electron microscopic analysis. Transmission electron microscopy was used to measure the particle size of the Co 3 O 4 nanoparticles. The absorption spectrum made it possible to analyze the optical properties of Co 3 O 4 nanoparticles. This work contributes to the study of dielectric properties such as the dielectric loss and the dielectric constant of Co 3 O 4 nanoparticles, at varied frequencies and temperatures. The magnetic properties of the Co 3 O 4 nanoparticles were also investigated.
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    Topics: Technology , Physics
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  • 5
    Publication Date: 2017-01-03
    Description: This paper introduces a new multilayered polymeric comb array antenna fabricated on a polydimethylsiloxane (PDMS) dielectric substrate. PDMS is selected due to its excellent electrical and mechanical properties such as low permittivity, water resistance and robustness. The polymeric comb array antenna consists of a zigzag array aligned at −90° with respect to the radiating patch with full ground plane. The radiating patch is embedded inside the PDMS substrate while the coaxial connector is located at the bottom of the transmission line. The proposed antenna functions from 22.649 to 27.792 GHz. Simulated and measured reflection coefficients and radiation patterns agreed well. A maximum gain of 9.856 dB is recorded at 25 GHz, indicating suitability for implementation in millimeter-wave applications.
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    Topics: Technology , Physics
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  • 6
    Publication Date: 2017-01-03
    Description: Additional external steady magnetic fields were applied to investigate the influence of a steady magnetic field aligned perpendicular to the welding direction during laser beam welding of 2024 aluminum alloy. The flow pattern in the molten pool and the weld seam geometry were significantly changed by the induced Lorentz force distribution in the liquid metal. It revealed that the application of a steady magnetic field to laser beam welding was helpful to the suppression of the characteristic wineglass-shape and the depth-to-width ratio because of the Marangoni convection. The microstructures and component distributions at various laser power and magnetic field intensity were analyzed too. It was indicated that the suppression of the Marangoni convection by Lorentz force was beneficial to accumulation of component and grain coarsening near the fusion line.
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  • 7
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    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2017-08-13
    Description: Advertisement, IEEE.
    Print ISSN: 0163-6804
    Electronic ISSN: 1558-1896
    Topics: Electrical Engineering, Measurement and Control Technology
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  • 8
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    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2017-08-13
    Description: Presents key events and topics in the global communications industry.
    Print ISSN: 0163-6804
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    Topics: Electrical Engineering, Measurement and Control Technology
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  • 9
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    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2017-08-13
    Description: Supporting real-time and mobile data services, fog computing has been considered as a promising technology to overcome long and unpredicted delay in cloud computing. However, as resources in FNs are owned by independent users or infrastructure providers, the ADSSs cannot connect and access data services from the FNs directly, but can only request data service from the DSOs in the cloud. Accordingly, in fog computing, the DSOs are required to communicate with FNs and allocate resources from the FNs to the ADSSs. The DSOs provide virtualized data services to the ADSSs, and the FNs, motivated by the DSOs, provide data services in the physical network. Nevertheless, with fog computing added as the intermediate layer between the cloud and users, there are challenges such as the resource allocation in the virtualized network between the DSOs and ADSSs, the asymmetric information problem between DSOs and ADSSs, and the resource matching from the FNs to the ADSSs in the physical network. In this article, we propose a three-layer hierarchical game framework to solve the challenges in fog computing networks. In the proposed framework, we apply the Stackelberg sub-game for the interaction between DSOs and ADSSs, moral hazard modeling for the interaction between DSOs and FNs, and the student project allocation matching sub-game for the interaction between FNs and ADSSs. The purpose is to obtain stable and optimal utilities for each DSO, FN, and ADSS in a distributed fashion.
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    Topics: Electrical Engineering, Measurement and Control Technology
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  • 10
    Publication Date: 2017-08-13
    Description: Fog computing is an architecture that extends the traditionally centralized functions of cloud computing to the edge and into close proximity to the things in an Internet of Things network. Fog computing brings many advantages, including enhanced performance, better efficiency, network bandwidth savings, improved security, and resiliency. This article discusses some of the more important architectural requirements for critical Internet of Things networks in the context of exemplary use cases, and how fog computing techniques can help fulfill them.
    Print ISSN: 0163-6804
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    Topics: Electrical Engineering, Measurement and Control Technology
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