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  • Resultat 132021-132030 av 290096
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132021.
  • Karakurt, Nuri, et al. (författare)
  • Thermoelectric Properties of Flexible PEDOT/PU and PEDOT/PVDF Films
  • 2019
  • Ingår i: CENTRAL EUROPEAN SYMPOSIUM ON THERMOPHYSICS 2019 (CEST). - : AMER INST PHYSICS. - 9780735418769
  • Konferensbidrag (refereegranskat)abstract
    • The growing energy demands for wearable electronic devices has shifted the attention of scientific community towards flexible thermoelectric materials and devices; the main goal being the enhancement of the thermoelectric and conducting properties of such systems, without sacrificing their flexibility. This paper reports the enhancement of the thermoelectric properties of flexible Poly(3,4-ethylenedioxythiophene), (PEDOT), films with acid (HCl) exposure. Relative high conductive, flexible and uniform PEDOT/polyurethane(PU) and (PEDOT)/polyvinylidene fluoride (PVDF) films were prepared, separately. The films were dipped into acid solution with the exposure time of 5, 10, and 15 min. The sheet resistance (Omega/sq), electrical conductivity (sigma), Seebeck coefficient (S) and thermoelectric power factor (sigma S-2) were measured for those systems. The thermoelectric behavior of both films was optimized with different exposure times in acid solution, while the thermoelectric properties of the PEDOT/PVDF films remained unchanged with this treatment. The Seebeck coefficient and thermoelectric power of PEDOT/PU enhanced from 9.01 to 12.6 mu V/K and from 7.4x10(-2) to 12.2x10(-2) mu W/mK(2), respectively for a 10 min exposure. The origin of this enhancement was tracked down to modifications in the surface morphology of the films, identified through AFM microscopy. The presented results indicate that acid treatment is a potential and promising approach to enhance the thermoelectric properties of PEDOT/PU films for flexible, conformable and low-cost TE applications.
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132022.
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132023.
  • Karaköse, Ayhan, et al. (författare)
  • Enucleation of the prostate gland with BIVAP.
  • 2013
  • Ingår i: 5th Urooncology Winter Congress, 30 Jan-3 Feb 2013, Skopje, Macedonien.
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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132024.
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132025.
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132026.
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132027.
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132028.
  • Karaliopoulos, Merkourios, et al. (författare)
  • Trace-based performance analysis of opportunistic forwarding under imperfect node cooperation
  • 2012
  • Ingår i: Proceedings of the 31st Annual IEEE International Conference on Computer Communications (IEEE INFOCOM 2012). - Orlando : IEEE Communications Society.
  • Konferensbidrag (refereegranskat)abstract
    • The paper proposes an innovative method for the performance analysis of opportunistic forwarding protocols over files logging mobile node encounters (contact traces). The method is modular and evolves in three steps. It first carries out contact filtering to isolate contacts that constitute message forwarding opportunities for given message coordinates and forwarding rules. It then draws on graph expansion techniques to capture these forwarding contacts into sparse space-time graph constructs. Finally, it runs standard shortest path algorithms over these constructs and derives typical performance metrics such as message delivery delay and path hopcount. The method is flexible in that it can easily assess the protocol operation under various expressions of imperfect node cooperation. We describe it in detail, analyze its complexity, and evaluate it against discrete event simulations for three representative randomized forwarding schemes. The match with the simulation results is excellent and obtained with run times up to three orders of size smaller than the duration of the simulations, thus rendering our method a valuable tool for the performance analysis of opportunistic forwarding schemes. 
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132029.
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132030.
  • Karamavus, Y., et al. (författare)
  • Design of a new optic probe for diffuse reflectance spectroscopy
  • 2015
  • Konferensbidrag (refereegranskat)abstract
    • Diffuse reflectance spectroscopy is a non-invasive spectroscopic technique for studying the optical properties of a biological tissue and hence can be used to detect chromophore concentration from the skin tissue. Here, a novel optical probe is presented to utilize diffuse reflectance spectroscopy. The proposed device contains an optical head that is easier to manufacture, more compact and more affordable than the existing fiber probes. This optical head consists of 19 fiber cables. The outer 12 fiber cables are used to expose the skin surface with a white light produced by a LED. And the reflected light emerging from the various layers of the tissue is collected by the inner 7 fiber cables, which is coupled to a spectrometer.
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  • Resultat 132021-132030 av 290096
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