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41.
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Rahal Rabah Amara Korba Abdelaziz Ghoualmi-Zine Nacira 《Wireless Personal Communications》2020,115(2):1415-1444
Wireless Personal Communications - Vehicular ad-hoc networks (VANETs) present security vulnerabilities, which make them prone to diverse cyberattacks. Denial of Service (DoS) is one of the most... 相似文献
43.
Nasser Y. Mostafa Mohsen M. Qhtani Saad H. Alotaibi Zaki I. Zaki Sarah Alharthi Mateusz Cieslik Karolina Gornicka Jacek Ryl Rabah Boukherroub Mohammed A. Amin 《国际能源研究杂志》2020,44(13):10695-10709
The high electrochemical stability of Zirconia (ZrO2) at high potentials strongly suggested it as an alternative to carbon supports, which experience reduced efficiency due to some corrosion problems particularly during prolonged electrocatalysis activity. However, the use of ZrO2 was limited by its low electrical conductivity and surface area. In this work, we developed a methodology for synthesizing monoclinic ZrO2 NPs with increased surface area and improved electrical/electrocatalytic characteristics without using any carbon-based co-support material or any metallic nanoparticles. In this context, for the first time, highly defective hydroxyl-functionalized ZrO2 NPs (designated here as ZT NPs) were prepared by a hydrothermal route in the presence of sodium tartrate as a mineralizer. XRD analysis demonstrated that the produced zirconia was semicrystalline microspheres, consisting of monoclinic ZrO2 NPs with high lattice defects. The addition of tartrate ions decreased the crystallite size and increased the defects and microstrain. At the same time, the alkaline hydrogen evolution reaction (HER) catalytic activity of ZrO2 NPs was significantly increased when using sodium tartrate as mineralizer; the overpotential required to obtain 10 mA cm−2 (η10) dropped down from 490 to merely 235 mV, while an exchange current density (jo) increased 12 times to 0.22 mA cm−2. The presence of structural defects (revealed by XRD) and the increased number of active surface sites contending O-H groups (evidenced from ATR-FTIR and XPS) as well as the enhanced electrochemical active surface area (confirmed from double-layer capacitance measurements) were the main reasons behind the high catalytic performance. The ZrO2 NPs catalytic activity increased even further during the long-term stability tests under severe cathodic conditions (ZT*, ZrO2 NPs obtained after the long-term stability, has jo = 0.47 mA cm−2 and η10 = 140 mV), approaching the activity of Pt/C catalyst. This process was assisted by mineralizer removal from the catalyst (testified by XPS). Our studies revealed that ZT* are characterized by larger electroactive surface area and more structure defects compared to ZT, where surface area and microstrains resulting from surface hydroxylation open cavities in zirconia structure. 相似文献
44.
Rabah Mohammed Rohan Ali Talha Muhammad Nam Kang-Hyun Kim Sung Ho 《International Journal of Control, Automation and Systems》2018,16(6):3013-3025
International Journal of Control, Automation and Systems - Target detection is crucial for many applications of Unmanned Aerial Vehicles (UAVs) such as search and rescue, object transportation,... 相似文献
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This paper concerns Remaining Useful Life (RUL) estimation of discrete event systems. For that purpose, physics-based models with partially observed stochastic Petri nets are used to represent the system and its sensors. The advantage of the proposed modelling approach is to provide a realistic representation of the system, including the interaction between the normal behaviours and the failure processes. From the proposed modelling and collected measurements, timed trajectories, which are consistent with the observations, are obtained. Based on the event dates, our approach consists in evaluating the probabilities of the consistent behaviours using probabilistic models. State estimation is obtained as a consequence. The most probable future degradations, from the current state, are then considered and a method for fault prognosis is presented. Finally, the prognosis result is used to estimate the RUL as a time interval. A case study is proposed to show the applicability of the proposed method. 相似文献
47.
Slimeni Feten Chtourou Zied Scheers Bart Nir Vincent Le Attia Rabah 《Wireless Networks》2019,25(7):4161-4171
Wireless Networks - This paper deals with the jamming attack which may hinder the cognitive radio from efficiently exploiting the spectrum. We model the problem of channel selection as a Markov... 相似文献
48.
This paper reports on the use of boron-doped diamond nanowires (BDD NWs) as an inorganic substrate for matrix-free laser desorption/ionization mass spectrometry (LDI-MS) analysis of small molecules. The diamond nanowires are prepared by reactive ion etching (RIE) with oxygen plasma of highly boron-doped (the boron level is 10(19) B cm(-3)) or undoped nanocrystalline diamond substrates. The resulting diamond nanowires are coated with a thin silicon oxide layer that confers a superhydrophilic character to the surface. To minimize droplet spreading, the nanowires were chemically functionalized with octadecyltrichlorosilane (OTS) and then UV/ozone treated to reach a final water contact angle of 120°. The sub-bandgap absorption under UV laser irradiation and the heat confinement inside the nanowires allowed desorption/ionization, most likely via a thermal mechanism, and mass spectrometry analysis of small molecules. A detection limit of 200 zeptomole for verapamil was demonstrated. 相似文献
49.
N. Bettahar D. Nasri S. Benalia M. Merabet B. Abidri N. Benkhettou R. Khenata D. Rached M. Rabah 《International Journal of Thermophysics》2013,34(3):434-449
Elastic, thermodynamic, electronic, and magnetic properties in the cubic antiperovskite InNCe $_{3}$ 3 compound are derived from the full-potential linear muffin-tin orbital method. From the computed elastic constants, theoretical values of Young’s modulus, the shear modulus, Poisson’s ratio, Lamé’s coefficients, sound velocities, and the Debye temperature are evaluated. Analysis of the ratio between the bulk modulus and the shear modulus shows that InNCe $_{3}$ 3 is brittle in nature. The variations of elastic constants with pressure indicate that this compound possesses higher mechanical stability in the pressure range from 0 to 40 GPa. The electronic and magnetic properties of this compound are calculated by adding the Coulomb interaction $U$ U to improve the results. 相似文献
50.
Analyses have been done on the climatic data to obtain physical building design specifications for various regional climatic conditions in Kenya. The main aim is to provide a general and appropriate information at strategic pre-design stages to make better use of passive solar energy in urban planning and, building design for better indoor ‘comfort’ climate and, the health and productivity of the building occupants. It utilizes a computer program, ARCHIPAK together with climatic data (for 8 year period) to get ‘comfort zones’, and ‘control potential zones’(CPZs), for nine stations representing Kenya fairly well by virtue of their geographical locations. The use of the CPZs in building design and the objectives of the pre-design guidelines are discussed for eight major provincial urban centers and the capital City of Nairobi, all with distinctive climatic conditions. Opportunities and limitations of the pre-design guidelines are also discussed. 相似文献