فهرست مطالب

  • سال ششم شماره 12 (تابستان 1398)
  • تاریخ انتشار: 1399/04/24
  • تعداد عناوین: 11
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  • Seyed Mehdi Hakimi* Page 6

    In this study a novel intelligent method is applied to the problem of sizing in a hybrid power system such that the demand of residential area is met and the results are analyzed from the viewpoint of meeting the demand and total costs. This study is performed for Ganje area in north-western Iran. The systems consist of fuel cells, some wind units, some electrolyzers, a reformer, a compressor, an anaerobic reactor and some hydrogen tanks. The system is assumed to be stand-alone and uses the biomass as an available energy resource. Our aim is to minimize the total costs of the system such that the demand is met. PSO algorithm is used for optimal sizing of system’s components.

    Keywords: Renewable energy, intelligent Micro network system, reliability indicators, particle assembly optimization
  • Sahar Dolatabadi*, Ali Karsaz Page 15

    Diabetes is one of the important issues in today’s human life in which its diagnostic and treatment process has several challenges. The blood glucose level stabilization to a normal level is the main purpose of the glucose control for diabetic patients. In type one diabetic patient, the ability to produce insulin by the pancreas is destroyed so the diabetic patients need to take externally insulin injection. To this end, some glucose-insulin modelling developments and close-loop robust control algorithms have been proposed over the last decades, lead to manufacturing automatic insulin injection pump or artificial pancreas. Also, the latest control technologies in this field are performed via the intelligence mobile phones for monitoring and control the blood glucose level and automatic insulin injection using an installed pump.

    Keywords: Diabetic patient, Glucose-insulin mathematical model, Diabetic close-loop control, Artificial pancreas, Intelligence mobile phones for blood glucose control
  • Zahra Kachoei*, Farzaneh Hashemi Nasr, Mehdi Salehirad, Farhad Akbari Boroumand Page 21

    organic light-emitting diodes )OLEDs( are quickly becoming the next generation of lighting sources due to the following advantages: low-cost manufacture methods, low power consumption, environment compatibility, light and flexibility. Commercialization of organic light-emitting diode lightings will depend on the success of overcoming current challenges in industrial manufacture method, efficiency and life time of system. In this study, current developments in the field of types of materials and preparation method of organic light-emitting diodes are discussed. Plastic substrates used in OLEDs, ITO smoothing method, transparent conductive electrodes replacing ITO, encapsulation methods and increasing light intensity are investigated. Most interesting manufacturing methods of OLED system such as roll-to-roll printing, gravure printing and inkjet printing are discussed and compared.

    Keywords: organic light-emitting diodes (OLED), challenges, solution, lighting sources, flexible
  • Hani Hasannia*, Mojdeh Mahdavi, Mahdi Zare Page 27

    Ultrasonic homogenizer devices are used to homogenize solutions. The basic functionality of these devices is the conversion of an electric current into a mechanical vibration current and the formation of intense pressure waves in liquid media. Under proper conditions, the pressure waves in the fluid create flow and cause rapid formation of micro bubbles. The growth and consolidation of these bubbles create intense heat and cause the cavitation phenomenon until they reach the maximum size and ultimately burst. The repetition of cavitation leads to homogenize the solution with this device. This device may be utilized in many industries such as pharmacy and food and is available in the market with a variety of power delivery. In this paper, an optimal design and implementation of an ultrasonic homogenizer system has been proposed, in which, while increasing the power, the implementation solutions for increasing the resistance of the device to the thermal effects of increased power are introduced. Upgrading the power to 600 watts is the most important feature of the designed device, which has been improved dramatically in accordance to other devices.

    Keywords: Ultrasonic Homogenizer, Cavitation, Homogenization, Power Enhancement
  • Mohammad Taheri*, Hadi Samiee Page 35

    In this work, the goal is to diagnose the occurrence of stress in individuals by observing the changes of pupil diameter signal that done by conducting a question and answer experiment on a group of people. The effect of autonomic nervous system function on involuntary behaviors, such as pupil diameter, heart rate, respiration rate, blood pressure, etc. has made it possible for researchers to identify certain events, such as stress in the nervous system of individuals, by observing these behaviors throughout time. Extraction of the pupil diameter signal is cheaper than other physiological signals, which can be acquired noninvasively and can easily combined with other physiological measurements. In addition, extraction of the pupil diameter signal can be done on a wide range of people. In order to classify the signals, we use the deep-belief neural network. the deep-belief neural network consists of restricted Boltzmann machine's layers has a good ability to extract signal characteristics and then classify them. The results and comparison them with other similar works indicate that the pupil diameter signal has a high ability to show the mental states of people in terms of relaxation and stress.

    Keywords: stress detection, pupil diameter, neural network, deep-belief neural network
  • Irandokht Amirjani Marvi*, Farzad Tahami Page 43

    with respect to increasing usage of evaporative cooler in Iran and low efficiency of AC induction motor used in them, a large amount of energy is being lost. In this paper design procedure of three permanent magnet synchronous motors with the output power of 250W, 370W, 550W which are used in evaporative cooler with air delivery of 3000, 5000 and 7000 m3/h is presented and then simulation and experimental result is described. The most important criteria in the design procedure include: minimizing total cost, maximizing efficiency, reduction of torque ripples, simplifying the construction method, using the same lamination geometrically for three motors and having the ability to replace with AC induction motors in conventional coolers.

    Keywords: Motor design, Permanent Magnet Synchronous Motor, Evaporative cooler
  • Zeinab Varaa*, Mahdiyeh Mehran Page 51

    Compared to the other sensors, capacitive one exhibits many advantages such as linear measurement capability, excellent sensitivity, easy-to-use principles and ease of manufacturing. There is no friction in these types of sensors, thus temperature, humidity, and mechanical disturbances don’t affect their performance. Due to the growing demand for the integrated on-chip electronic systems and need for the sensor downscaling, interdigital capacitor type of the sensors has become increasingly popular. Interdigital capacitors )IDC( are fabricated on an insulating substrate. Electrodes of the IDCs are located on the same plate, which are connected to the ground or terminal voltage. The electrical field lines are closed through the substrate and dielectric material, which is placed on the electrodes. Moreover, based on the number of fingers and their geometrical specifications, capacitance of the IDCs varies. Sensitivity and capacitance of the interdigital capacitors are relatively higher in comparison with the other capacitors. Advantages of the IDCs make them a proper option for using in the sensors. These capacitors are also used in the chemical and biological sensors and in the telecommunications. In this study, a review on the capacitive sensors based on the IDCs and liquid dielectric has been accomplished.

    Keywords: Micro Electromechanical systems, Capacitive sensors, Inter-finger Capacitors, Liquid Dielectrics