فهرس المقالات temperature effect

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  1 - Analysis of Nonlinear Vibration of Piezoelectric Nanobeam Embedded in Multiple Layers Elastic Media in a Thermo-Magnetic Environment Using Iteration Perturbation Method
  M.G Sobamowo
  10.22034/jsm.2021.1911067.1648
  In this work, analysis of nonlinear vibration of piezoelectric nanobeam in a thermo-magnetic environment embedded in Winkler, Pasternak, quadratic and cubic nonlinear elastic media for simply supported and clamped boundary conditions is presented. With the consideration أکثر

  In this work, analysis of nonlinear vibration of piezoelectric nanobeam in a thermo-magnetic environment embedded in Winkler, Pasternak, quadratic and cubic nonlinear elastic media for simply supported and clamped boundary conditions is presented. With the considerations of Von- Karman geometric nonlinearity effect and with the aids of nonlocal elasticity theory as well as Euler–Bernoulli beam model, the equation of motion for the nanobeam is derived using Hamilton’s principle. The nonlinear dynamic model is solved using Galerkin-decomposition coupled with iteration perturbation method. From the parametric studies, it is shown that the frequency of the nanobeam increases at low temperatures but decreases at high temperatures. The nonlocal parameter decreases the frequencies of the piezoelectric nanobeam. An increase in the quadratic nonlinear elastic medium stiffness causes a decrease in the first mode of the nanobeam with clamped-clamped supports and an increase in all modes of the simply supported nanobeam at both low and high temperatures. When the magnetic force, cubic nonlinear elastic medium stiffness, and amplitude increase, there is an increase in all mode frequencies of the nanobeam. An increase in the temperature change at high temperature reduces the frequency ratio but at low or room temperature, an increase in temperature change, increases the frequency ratio of the structure nanotube. The significance of this study is evident in the design and applications of nanobeams in thermal and magnetic environments. تفاصيل المقالة
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  2 - Adsorption of phosgene on Al12N12 nanocluster: Quantum chemical study
  A Amiri Reza Ghiasi Karim Zare Reza Fazaeli
  10.22034/jna.2021.1914624.1239
  This study investigated the adsorption of phosgene gas on Al12N12 nano-cluster with using CAM-B3LYP functional. Six possible isomers of the interaction between Al12N12 nano-cluster and phosgene were considered. The interactions between nano-cluster and phosgene were exa أکثر

  This study investigated the adsorption of phosgene gas on Al12N12 nano-cluster with using CAM-B3LYP functional. Six possible isomers of the interaction between Al12N12 nano-cluster and phosgene were considered. The interactions between nano-cluster and phosgene were examined through energy decomposition analysis (EDA). Charge transfer between fragments were illustrated with electrophilicity-based charge transfer (ECT). Thermodynamics parameters of the interaction between of nano-cluster and phosgene gas were calculated. The temperature and pressure effects on the thermodynamic parameters were illustrated.Computational investigation of the adsorption behavior of phosgene on Al12N12 cage revealed e-isomer was most stable isomer in between the studied isomers. The calculated Ecoh values showed that e-isomer was most stable isomers. The larger HOMO-LUMO gap value in the e-isomer of Al12N12… COCl2 rather than Al12N12 cage showed that COCl2 adsorption meaningfully increase this value. Therefore, we believe that the Al12N12 may be a suitable nanoscale carrier for COCl2 gas. The positive value of ECT revealed charge flow from Al12N12 to COCl2 gas. Thermodynamics analysis showed that easy adsorption under lower temperature and higher pressure. تفاصيل المقالة
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  3 - Quantum chemical study of the adsorption of phosgene on Al12N12 nano-cluster
  Asma Amiri Reza Ghiasi Karim Zare Reza Fazaeli
  10.22034/jna.2021.690107
  This study investigated the adsorption of phosgene gas on Al12N12 nanoclusterusing CAM-B3LYP functional. Six possible isomers of the interaction betweenAl12N12 nanocluster and phosgene were considered. The interactions betweennanocluster and phosgene were examined throu أکثر

  This study investigated the adsorption of phosgene gas on Al12N12 nanoclusterusing CAM-B3LYP functional. Six possible isomers of the interaction betweenAl12N12 nanocluster and phosgene were considered. The interactions betweennanocluster and phosgene were examined through energy decomposition analysis(EDA). Charge transfer between fragments was illustrated with, electrophilicitybasedcharge transfer (ECT). Thermodynamics parameters of the interactionbetween nanocluster and phosgene gas were calculated. The temperature andpressure effects on the thermodynamic parameters were illustrated. تفاصيل المقالة
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  4 - Numerical Study of the Effect of Temperature Changes on the Failure ‎Behavior of Sandwich Panels with Honeycomb Core ‎
  Ismaeil ‎ Eynali Seyed Alireza Seyed Roknizadeh
  In this paper, failure modes of sandwich panels are investigated numerically using finite element method. For this purpose, four sandwich beams of GFRP laminateskins and Nomex honeycomb core are considered. The models have been chosen so that they could cover all failur أکثر

  In this paper, failure modes of sandwich panels are investigated numerically using finite element method. For this purpose, four sandwich beams of GFRP laminateskins and Nomex honeycomb core are considered. The models have been chosen so that they could cover all failure modes according to available experimental failure mode maps. Models are created and analyzed based on standard 3-points bending test, using ASTM standard C393-62. In order to investigate the effect of loading and sandwich panelparameters on failure behavior, finite element analysis has been utilized. The results are verified by comparing experimental and theoretical results. The constructed failure mode map shows dependence of failure mode on the ratio of skin thickness to span length, and honeycomb relative density. To Then, effect of temperature on the failure modes ofsandwich panels, has been investigated. Results show that failure modes haven’t depended on environment temperature and failure load decreases by increasing environmentaltemperature. The slope of reduction is a function of beam geometrical parameters.Depending on the parameters, the failure loads decrease between 10% to 40% byincreasing environmental temperature. تفاصيل المقالة
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  5 - Fixed Capacitor Magnetically Controlled Reactor Reliability Modelling Considering Environmental Conditions
  Morteza Haghshenas Rahmat-Allah Hooshmand
  10.30495/ijsee.2024.2004567.1299
  The fixed capacitor-magnetically controlled reactor (FC-MCR) is a type of static var compensator (SVC) that can greatly contribute to the availability and stability of power systems. This paper proposes a comprehensive reliability model for the FC-MCR using the Markov p أکثر

  The fixed capacitor-magnetically controlled reactor (FC-MCR) is a type of static var compensator (SVC) that can greatly contribute to the availability and stability of power systems. This paper proposes a comprehensive reliability model for the FC-MCR using the Markov process approach. The modeling process adheres to actual operational principles and divides the MCR structure into two sections: electro-magnetic section and core magnetization section. Subsequently, the Markov models proposed for these sections are integrated with the Markov model of the fixed capacitor bank to derive the FC-MCR reliability model. Recognizing the impact of environmental conditions on electrical equipment failure rates, the proposed reliability model takes into account temperature variations and assesses their influence on the probabilities of the FC-MCR operating state. By examining the simulation results and conducting sensitivity analysis, it was found that the availability of the FC-MCR is influenced by various components and environmental conditions, which necessitates different reliability enhancement measures. Moreover, a comparison between the reliability indices of the FC-MCR and its counterpart (FC-TCR) in diverse environmental conditions revealed that the FC-MCR is less affected by temperature variations compared to the FC-TCR. تفاصيل المقالة