List of Articles دیافراگم

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  1 - Energy harvesting from diaphragm muscle using piezoelectric specification
  Sepehr  khalafzadeh Farshad Pesaran Nabiollah Shiri
  One of the most important applications of bioelectronics is to improve health and increase the lifespan of people through implantable devices. These types of equipment become more important and find more applications day-by-day. To improve the performance and lifetime o More

  One of the most important applications of bioelectronics is to improve health and increase the lifespan of people through implantable devices. These types of equipment become more important and find more applications day-by-day. To improve the performance and lifetime of these equipment inside the body, they must have a stable energy supply. Batteries can save energy, but they must be replaced by passing the time, and this causes resurgery and extra costs for the patient. In this regard, many efforts have been made to supply this needed energy from inside the body. In this research, a new method for harvesting energy from the contraction movement of the diaphragm muscle is presented. In this method, a mechanical structure is used that transfers the energy from the diaphragm movement to the piezoelectric layer through a silicon spring. The piezoelectric layer stores the harvested energy in the electrical form. Manuscript profile
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  2 - Evaluating the effect of pressure on the diaphragm micro- electro-mechanical thickness and the amount of shift in medical applications
  Nazli Zargarpour
  In this paper, the influence of design parameters on the sensitive microphone diaphragm for use in implantable medical applications is presented.The different parameters such as diaphragm shape, size, thickness and different applied pressures on the diaphragm has been c More

  In this paper, the influence of design parameters on the sensitive microphone diaphragm for use in implantable medical applications is presented.The different parameters such as diaphragm shape, size, thickness and different applied pressures on the diaphragm has been considered. The effect of changes in these parameters on the displacement and stress in a variety of shapes of diaphragm is discussed. In order to design the optimal shape of the proposed diaphragm for the considered parameters, it has been simulated and analyzed in software COMSOL.According to the parameters, the diaphragm shapes of square, rectangular and oval with respect to the intended user, average central displacement in human hearing frequency range 20Hz-20KHz are nm 5. 5, nm2. 6, and nm 130 respectively .According to the results of the simulations, the oval-shaped diaphragm that has been studies in this paper, the possibility of implanted medical applications, performance is optimal than other shapes. In addition, the piezoelectric material is PZT which used in the design of the diaphragm. Manuscript profile
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  3 - .
  mohammad falah gorji salar naghibzadeh pantea hoseini mehdi tavana
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  4 - Continuous electrowinning of nickel from dilute sulfate solutions
  Alireza Zakeri Amirreza Sheikh Karami
  Significant amounts of nickel products used in different chemical processes and general applications leave them a valuable source of nickel at the end-of-life. Production of nickel from secondary sources is generally performed through hydro-electrometallurgical methods. More

  Significant amounts of nickel products used in different chemical processes and general applications leave them a valuable source of nickel at the end-of-life. Production of nickel from secondary sources is generally performed through hydro-electrometallurgical methods. The resulting solutions from treatment of secondary nickeliferous resources are generally of low Ni concentration and electrowinning of them is challenging, particularly since Ni concentration in commercial operations is usually more than 80 g/L. In this paper, the continuous electrowinning of nickel from dilute sulfate solutions has been investigated. The effects of four variables of temperature, specific flow rate of electrolyte, current density, and nickel concentration on current efficiency and specific energy consumption were studied by a two-level full factorial design. From the statistical analysis of the results, it was found that current efficiency increases by rising all variables, while specific energy consumption decreases with specific flow rate of electrolyte, current density, and nickel concentration. By using the obtained statistical models, the optimum conditions to achieve a nickel deposit with high current efficiency as well as lowest energy consumption are determined to be 55 °C of temperature, 3 A/dm2 of current density, 3 h−1 of electrolyte specific flow rate, and 30 g/L of nickel concentration. Manuscript profile