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• Pat, Suat(15)
• Özen, Soner(15)
• Korkmaz, Şadan(11)
• Şenay, Volkan(10)
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• Zhang, Z.F.(3)
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• Altuntas, Serkan(2)
• Asiri, Abdullah M.(2)
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• MakaleAçık Erişim2015Scopus SJRQ2/r/bayburt/12255
  Direct and fast growth of GaAs thin films on glass and polyethylene terephthalate substrates using a thermionic vacuum arc

  Pat, Suat; Korkmaz, Şadan; Özen, Soner; Şenay, Volkan

  Using a thermionic vacuum arc, single‐crystal gallium arsenide (GaAs) layers of micron thickness were grown on PET and glass substrates in 2 min. We present a new deposition mechanism and parameters for GaAs thin films produced in a very short time. Crystal direction was found to be (111) plane for the GaAs/PET sample and (022) plane and (133) plane for the GaAs/glass sample, respectively. The average roughness values of the deposited thin films were determined to be approximately 30 nm for GaAs/PET and 60 nm for GaAs/glass. The structures can be seen clearly in field emission scanning electron microscopy and atomic force microscopy. The obtained optical band is nearly the same with literatures values of the GaAs. Although produced structures in different crystal formations, only aggregations dimensions and absorbance of the layers were changed. Obtained refractive index values are nearly same with database info.

  AtıfScopus16·WoS18·OpenAlex16

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• MakaleAçık Erişim2015Scopus SJRQ2/r/bayburt/12233
  MAC protocols for energy harvesting wireless sensor networks: Survey

  Kosunalp, Selahattin

  Energy harvesting (EH) technology in the field of wireless sensor networks (WSNs) is gaining increasing popularity through removing the burden of having to replace/recharge depleted energy sources by energy harvester devices. EH provides an alternative source of energy from the surrounding environment; therefore, by exploiting the EH process, WSNs can achieve a perpetual lifetime. In view of this, emphasis is being placed on the design of new medium access control (MAC) protocols that aim to maximize the lifetime of WSNs by using the maximum possible amount of harvested energy instead of saving any residual energy, given that the rate of energy harvested is greater than that which is consumed. Various MAC protocols with the objective of exploiting ambient energy have been proposed for energy-harvesting WSNs (EH-WSNs). In this paper, first, the fundamental properties of EH-WSN architecture are outlined. Then, several MAC protocols proposed for EH-WSNs are presented, describing their operating principles and underlying features. To give an insight into future research directions, open research issues (key ideas) with respect to design trade-offs are discussed at the end of this paper.

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  AtıfScopus56·WoS45·OpenAlex57

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