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  Subjects -> ALTERNATIVE MEDICINE (Total: 106 journals)
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Journal of Alternative and Complementary Medicine
Journal Prestige (SJR): 0.571
Citation Impact (citeScore): 2
Number of Followers: 14  
 
Hybrid Journal Hybrid journal   * Containing 7 Open Access Open Access article(s) in this issue *
ISSN (Print) 1075-5535
Published by Mary Ann Liebert Homepage  [102 journals]
  • Numerical and analytical evaluation of airship configuration
         This is an Open Access Article Open Access Article

    • Free pre-print version: Loading...

      Authors: A Golmakani, S Noori, N Karimi
      Pages: 337 - 355
      Abstract: Today, airships have many uses and have been considered because they combine the benefits of a ship and an aircraft and the low cost of energy consumption. In this research, with the help of numerical solutions and analytical solutions in Datcom, three common configurations of an airship at various angles of attack are investigated. The results of numerical and analytical solutions are compared. Flow condition was considered at an altitude of 4 km above the ground. The same results are not obtained in numerical and analytical solutions. Certainly, numerical results can be cited more than analytical solutions because Datcom software has computational errors and has been simplified. It has been developed for the analytical flow solution on the slender body. However, despite the existing error, this software can be used to extract computational processes and sensitization some parameters. The results show that the approach of the tail fins to the tip of the airship increases the lift-to-drag ratio, and with increasing the length-to-diameter ratio, the aerodynamic performance also improves. In all variants, converting the fins to a cross-type variant improves the vehicle's aerodynamic performance.
      PubDate: 2022-12-12
      DOI: 10.21152/1750-9548.16.4.337
      Issue No: Vol. 16, No. 4 (2022)
       
  • Investigation of radiation heat transfer in a CAN combustion chamber of a
           micro gas turbine

         This is an Open Access Article Open Access Article

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      Authors: F Fasihi, S Noori, M Eidiattarzade
      Pages: 357 - 381
      Abstract: Thermal radiation plays a key role in heat transfer between the flame and its surroundings. Measuring the radiation flux from the flame in the chamber is challenging due to the impact of the walls. Radiation emitted from the walls and the reflection of flame radiation from the walls interfere with the measurement of flame radiation. In this paper, various parameters that affect flame radiation are investigated. These studies are based on wall incident radiation and wall radiation heat flux. A theoretical method is proposed to calculate the flame radiation and compared it with the CFD simulation results to confirm its accuracy. The DO radiation model and a steady Flamelet combustion model with modified k-ε turbulence have been used to simulate the can-type combustion chamber.  The CFD results were in good agreement with their theoretical ones, and the estimation of flame emission was accurately acceptable. It found out that in the entire temperature range of the wall temperature investigated in this type of combustion chamber, the radiation from the wall never deflects more than 10% of the flame radiation.
      PubDate: 2022-12-12
      DOI: 10.21152/1750-9548.16.4.357
      Issue No: Vol. 16, No. 4 (2022)
       
  • Electro-Thermal simulation study of MOSFET modeling in Silicon and Silicon
           carbide

         This is an Open Access Article Open Access Article

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      Authors: B Mourched, N Abboud, M Abdallah, M Moustafa
      Pages: 383 - 394
      Abstract: In this paper, a 2D electro-thermal coupling model of a MOSFET power device is presented using COMSOL Multiphysics software. The main objective of the model is to investigate and analyze the effect of temperature change on the electrical characteristics of a lateral MOSFET, visualize the heat distribution throughout the device, and calculate the peak temperature reached under extreme conditions. Thus, a comparison study is performed between Si and 6H-SiC based devices to highlight the effect of device material on its performance. The temperature distribution and the maximum temperature reached in both Si and 6H-SiC MOSFETs evaluate the reliability of the power component. The obtained results reveal lower drain currents and hot spot temperature values  lower in 6H-SiC MOSFET.
      PubDate: 2022-12-12
      DOI: 10.21152/1750-9548.16.4.383
      Issue No: Vol. 16, No. 4 (2022)
       
  • Research on Manufacturing Technology of Complex Modeling Chinaware
           Integrated with 3D Printing Technology

         This is an Open Access Article Open Access Article

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      Authors: H Zheng, H Ao, L Wang
      Pages: 395 - 406
      Abstract: Study the manufacturing process of making complex chinaware by combining 3D printing technology with traditional technology. In this process, the ceramic artwork is divided into several component, The manufacturing process of each part of the green body is selected according to the shape, and then all the green bodies fit together by the assembly structure and interpenetrating network binder, then biscuit firing (debinding), glazing and glaze firing. Adjust the composition ratio of ceramic slurry to make its sintering shrinkage the same as that of traditional ceramic slurry. The technological process and parameters are given through experiments. The structure were analyzed by field emission scanning electron microscope. The influence factors of glue discharge process, microstructure and pore distribution of printing body after glue discharge were studied. This provides a basis for the popularization and application of the process.
      PubDate: 2022-12-12
      DOI: 10.21152/1750-9548.16.4.395
      Issue No: Vol. 16, No. 4 (2022)
       
  • Effects of microwave heating on mechanical properties and energy evolution
           mechanism of granite under conventional triaxial compression

         This is an Open Access Article Open Access Article

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      Authors: J Yang, L Qiao, X Li, Q Li, W Wang
      Pages: 407 - 424
      Abstract: To explore the influences of microwave irradiation on the mechanical response mechanism of rock under different confining pressures, granite specimens were subjected to different microwave heating paths, then conventional triaxial compression experiments were conducted. The experimental results show that: 1) As microwave irradiation power and time increase, the density and P-wave velocity of the specimen show a downward trend and the higher the power, the faster the decline; 2) The sensitivity of specimen strength to confining pressure and microwave (power and time) is ranked thus (in descending order): confining pressure, microwave power, then irradiation time. Under a low confining pressure, the strength value of the specimen exhibits a decreased trend with the increase of irradiation time, but with the increase of confining pressure, the change of the strength of the specimen tended to be consistent; 3) The strain energy evolution of the specimen is similar, it is mainly manifested in energy accumulation before the peak, and energy dissipation and release thereafter. Under the influence of microwave radiation, the evolution of dissipation ratio shows a significant microwave effect, but the microwave effect becomes weaker with the increase of confining pressure. Therefore, when using microwave rock-breaking techniques, combined with necessary pressure-relief technique, microwave irradiation can produce the best rock-breaking effect.
      PubDate: 2022-12-12
      DOI: 10.21152/1750-9548.16.4.407
      Issue No: Vol. 16, No. 4 (2022)
       
  • Application of piezoelectric composites to control operation of a gas foil
           bearing – prototype design and testing

         This is an Open Access Article Open Access Article

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      Authors: A Martowicz, P Zdziebko, J Roemer, G Żywica, P Bagiński, A Andrearczyk
      Pages: 425 - 435
      Abstract: Essential parts of rotating machineries are supporting nodes, i.e., bearing systems. They assure required rotational degrees of freedom and feature desired load carrying capacity. Following the specificity of a technical solution considered, various types of bearings may be taken into account to effectively address the requirements regarding the speed and load. Specifically, gas foil bearings (GFB) are used in high-speed and lightly-loaded rotating machineries, e.g., auxiliary power units. In fact, they can operate up to several hundreds of thousands rpm, also for a wide temperature range. The current work reports an application of piezoelectric composites to control operation of a GFB. The authors present the developed bearing’s prototype installation which is equipped with a specialized multifunctional structural component that advantageously allows to both characterize GFB’s operational parameters and modify them. The experimental results confirm the usability of the proposed actively-controlled configuration of a GFB.
      PubDate: 2022-12-12
      DOI: 10.21152/1750-9548.16.4.425
      Issue No: Vol. 16, No. 4 (2022)
       
  • Multiphysics based Analysis of Materials for Roads in Cold Regions to
           Prevent Ice Adhesion and Low-Temperature Crack Developments

         This is an Open Access Article Open Access Article

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      Authors: Z Andleeb, H Khawaja, M Moatamedi
      Pages: 437 - 447
      Abstract: Roads constitute a significant hazard if the effects of wintertime are not handled well. After a heavy snowfall, the most dangerous factor is a slippery surface due to ice adhesion with the asphalt pavement. The ice on roads increases the risk of road accidents and, upon melting, contributes to the formation of Low-Temperature Cracks (LTCs) and potholes. This research explores the physical principle that could remove the ice from concrete roads by investigating whether road ice is susceptible to self-separation upon loading when the road surfaces in cold regions are coated with a polymer-based material such as polyurethane. This study conducted an experimental and numerical analysis of ice-polyurethane and ice-concrete separation under tensile load and calculated the Von-Mises stresses on the surfaces. Results revealed higher Von-Mises stresses on ice when the base material is polyurethane compared to concrete, indicating ice is more prone to self-separation when adhered to polyurethane than concrete. These results are important for increasing the operational life of roads in cold regions and reducing the number of road accidents. In addition, polyurethane is a potential material for pre-emptive road measures, such as repairing cracks before they become potholes.
      PubDate: 2022-12-12
      DOI: 10.21152/1750-9548.16.4.437
      Issue No: Vol. 16, No. 4 (2022)
       
 
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