امپدانس

Open Access Article

1 - بررسی مقایسه ای مدل های پیشگوی بار میکروبی بر پایه امپدانس در بستنی- های وانیلی و کاکائویی تولیدی به روش های سنتی وصنعتی
علی فضل آرا سیاوش مکتبی فاطمه نوروزی

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Open Access Article

2 - Optical Amplifier Design with Increased Dynamic Range Bandwidth for Optical Telecommunication Receiver Applications
reza kazerani najmeh cheraghi shirazi دکتر عبدالرسول Ghasemi

In this paper an optical amplifier with increased dynamic range bandwidth with inductive amplification technique, including a transient impedance amplifier (TIA) for use in an optical telecommunication system for applications with 10Gb / s data rate using CMOS18.0.0 &mi More

In this paper an optical amplifier with increased dynamic range bandwidth with inductive amplification technique, including a transient impedance amplifier (TIA) for use in an optical telecommunication system for applications with 10Gb / s data rate using CMOS18.0.0 µm technology Designed and simulated. For the proper design of a fiber optic amplifier, the design of the transient impedance amplifier is a key element of this type of amplifier so that it compromises between challenging issues such as bandwidth, gain and power consumption. Appropriate bandwidth and interest required for use in new telecommunications And transfer an image. In this paper, the inductive enhancement technique developed by the predecessor is used to improve the parameters. In this technique, the desired inductor resonates with the parasitic capacitors of the circuit and creates a peak in the circuit which increases the bandwidth and gain of the circuit. Linear Mode In certain situations, such as short-circuit optical fiber, a technique called shunt technique is used to keep the circuit in linear mode. . The simulation results show that the proposed circuit has 1.8v power supply, 57.6 mW power, 5.98GHz bandwidth and 25dBΩ output. Manuscript profile

Open Access Article

3 - Design and simulation of a wired antenna with a new structure and compare it with a conventional unipolar antenna of equal length
Firooz Mohsenifard Ebrahim Abiri Jahromi Abbas Fazel Zakeri

In this paper, a wired antenna with a new structure for the central frequency of 15 MHz is designed and simulated. In addition to being shorter than the wavelength, this antenna has a high radiant resistance and low imaginary resistance compared to a unipolar antenna of More

In this paper, a wired antenna with a new structure for the central frequency of 15 MHz is designed and simulated. In addition to being shorter than the wavelength, this antenna has a high radiant resistance and low imaginary resistance compared to a unipolar antenna of equal length. Also, for high efficiency and maximum bandwidth in the frequency range of 10 to 25 MHz, the dimensions of the antenna have been optimized.  S-NEC software is used to design and simulate this antenna, which is one of the specialized software in this field. It is also possible to increase the dimensions of the antenna by a certain ratio, for example 1000, and therefore the operating frequency of the antenna decreases by the same ratio, such antennas that work in the VLF band are used for special purposes. Manuscript profile

Open Access Article

4 - Design of a variable gain CMOS transmission impedance amplifier for optical receiver amplifier
Mehdi Faraji Ebrahim Borzabadi Hossein Pourghasem

In this paper, the design and simulation of a transmission impedance amplifier using 0.18 µ CMOS technology for use in the amplifier section of optical telecommunication receivers are presented. The idea presented in this paper is based on the use of a parallel-pa More

In this paper, the design and simulation of a transmission impedance amplifier using 0.18 µ CMOS technology for use in the amplifier section of optical telecommunication receivers are presented. The idea presented in this paper is based on the use of a parallel-parallel feedback structure with a cascade interest rate. This structure is quasi-differential and is designed to increase the allowable range of input power and prevent amplifier saturation, a circuit with a variable gain. The simulation results show a maximum gain of 64 dB, a bandwidth of 1.8 GHz, power consumption of 20mw, and a spectral intensity of the noise current referred to as the PA / 9 input. Also, by using variable gain control, the gain of the amplifier transmission impedance can be reduced to 46 dBΩ. The results indicate that the proposed design is very suitable for a 2.5 Gb / s optical telecommunication system. Manuscript profile

Open Access Article

5 - Design and Modeling of Inductively Coupled RFID Antennas
Zahra Aref Darabi Sima Honarmand

Radio Frequency Identification is the method identifity object  individual by use radiowave. Use this technology we can collect information for production, time and trades. This system is include three section tag, reader and host computer that antenna goal in a RF More

Radio Frequency Identification is the method identifity object  individual by use radiowave. Use this technology we can collect information for production, time and trades. This system is include three section tag, reader and host computer that antenna goal in a RFID tag is couple of chip with reader  magnetic fild. In this paper inductively coupled RFID antennas in two different structures, namely arc-shape and dual-body configurations, are presented. High input resistance can be easily achieved with these structures to realize conjugate impedance matching with some tag chips. 1.99dBi and 5.62dBi directivities at 915MHz are also observed. Manuscript profile

Open Access Article

6 - Predictive model design for microbial load based on impedance in traditional and industrial dried vegetables
N. Najjarpoor A. Fazlara M. Tadayoni

This study was aimed to use of impedance technique and comparison of its results with reference method in traditional and industrial dried vegetables. In this study, 30 samples of traditional dried vegetable and 30 samples of industrial dried vegetable were tested for m More

This study was aimed to use of impedance technique and comparison of its results with reference method in traditional and industrial dried vegetables. In this study, 30 samples of traditional dried vegetable and 30 samples of industrial dried vegetable were tested for microbial counts by reference method of culture and Impedance device in accordance with the Instruction of Standards and Industrial Research Institute of Iran. The impedance method showed the minimum and maximum number of microorganisms in traditional samples were 4.80 × 104 and 1.40 × 106 bacteria per gram respectively. The minimum and maximum number of microorganisms in industrial samples were 6.00 × 102 and 7.00 × 105 bacteria per gram, respectively. The maximum detection time in impedance method in industrial and traditional dried vegetables was 20.24 and 23.68 hours, respectively and minimum detection time in industrial and traditional samples was 11.35 and 8.25 hours. The results showed determination coefficients of bacterial load in dried vegetable by regression equations were 0.9169, 0.9133 and 0.8861 in traditional, industrial and total of two method dried vegetables respectively. It indicates that high correlation was between reference and impedance methods for traditional and industrial dried vegetables. Microbial load in traditional and industrial dried vegetables was higher and lower than that of standard limit, respectively. Therefore, impedance technique could be used as an alternative method for control of bacterial load in dried vegetable. Manuscript profile

Open Access Article

7 - Correlation of impedance with plate count method, pH, and TVN in the evaluation of microbial load of minced beef
R. Zangeneh A. Fazlara M. Pourmahdi

10.30495/jfh.2019.669284

Measuring the total microbial count of cow minced meat with the conventional method and comparing the result with standard limits is one of the routine tests. Achieving the results of total microbial count in minimum time is really important for confidence from the hygi More

Measuring the total microbial count of cow minced meat with the conventional method and comparing the result with standard limits is one of the routine tests. Achieving the results of total microbial count in minimum time is really important for confidence from the hygienic quality of products. So impedance- splitting method as a new technique for this purpose was considered in order to receive the results in less time and as soon as possible. The main purpose of the study was to evaluate the correlation between impedance detection times (IDT in hrs), total microbial population (log CFU/g), total volatile nitrogen (TVN) and pH of minced meat. Totally 80 minced meat samples were collected and examined for the total microbial count by reference and impedance - splitting methods, also total volatile nitrogen and pH were measured based on the recommendations of Iran's Standard Institute and Industrial Investigation. Then the calibration curves of methods and their equations were obtained by using Excel software. The calibration curves of methods were elaborated for total microbial count and impedance detection time, demonstrating a good correlation between the two methods in mince neat samples equal to %93/39. Also according to the calibration curves, the correlation between impedance detection time and total volatile nitrogen in all of the samples was equal to %69.8. Also, the correlation between total microbial count and pH was equal to %71/4. According to the aforementioned correlation values, the impedance technique could be only recommended as an alternative method in evaluating the microbial load of the minced meat. Manuscript profile

Open Access Article

8 - The Application Three-phase to Single-phase Z-Source Matrix Converter in Wind Turbine
Vahid Asadirad Seyed Babak Mozafari Soodabeh Soleymani Morchehkhorti

In this paper a new idea of direct three-phase to single-phase Z-source matrix converter (impedance-source matrix converter) applicable in stand-alone wind turbine is introduced. In the direct Z-source matrix converter amplitude of output voltage and frequency regulatio More

In this paper a new idea of direct three-phase to single-phase Z-source matrix converter (impedance-source matrix converter) applicable in stand-alone wind turbine is introduced. In the direct Z-source matrix converter amplitude of output voltage and frequency regulation are of importance to control system. In wind turbines, input voltage and frequency are usually changing due to wind speed variation that these alterations could be easily regulated by means of a direct Z-source matrix converter. A scheme is also offered to control the proposed direct three-phase to single-phase Z-source matrix converter. the control strategy would be able to adjust the output voltage and frequency at desired value as well as producing low THD (total harmonic distortion) at the output voltage. The proposed structure and the control methodology are simulated using matlab simulink software and results are investigated and discussed to confirm the performance of the direct Z-source matrix converter in wind turbine. Manuscript profile

Open Access Article

9 - Design and Simulation of a Dual-Band Filtering Power Divider Using Stepped Impedance Resonators and present a novel method for generation of transmission zeros
Mojtaba Mirzaei Mohammad Amin Honarvar

In this article, a compact power divider with dual-band frequency response, designed and simulated using dual-mode stepped impedance resonators (SIRs) for WLAN application. The resonant frequencies of the proposed stepped impedance resonator are investigated using even- More

In this article, a compact power divider with dual-band frequency response, designed and simulated using dual-mode stepped impedance resonators (SIRs) for WLAN application. The resonant frequencies of the proposed stepped impedance resonator are investigated using even- and odd-mode analysis for frequency of 2.4 GHz and 5.2 GHz. A new method is presented for feeding the stepped impedance resonators that using the wave cancellation theory to create transmission zeros near the pass bands. Finally, four transmission zeros are generated around the both pass bands to improve the selectivity and out of band isolation. To reducing the circuit size and possibility of the feeding method implementation, two spiral stepped impedance resonators are used to design the filtering power divider. the designed power divider is simulated by HFSS software. The proposed filtering power divider has a miniature size (0.14 λg × 0.15 λg), good isolation between the output ports as well as appropriate operation at the pass bands. Manuscript profile

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10 - Sensorless Estimation of Battery Internal Temperature Using Dual Extended Kalman Filter
Mohseh Gholamrezaei Mohammad Toloo Askari

Abstract: The conventional approaches for estimating internal battery temperature use numerical electric-thermal models in which a temperature sensor is required. In order to ensure safe and proper use of lithium-ion batteries during operation, accurate estimation of ba More

Abstract: The conventional approaches for estimating internal battery temperature use numerical electric-thermal models in which a temperature sensor is required. In order to ensure safe and proper use of lithium-ion batteries during operation, accurate estimation of battery temperature is very important. In this paper, a method for estimating the surface and core temperature of the battery cell is presented using a coupled thermal model with an electrical impedance model without direct measurement of surface temperature. For this purpose, a dual extended Kalman filter (DEKF) consisting of a reduced thermal model along with battery current, voltage and impedance measurement can accurately estimate the temperature of the battery surface and core. The performance of the method is demonstrated experimentally on a 2.3-Ah lithium-ion iron phosphate cell fitted with surface and core thermo-couples for validation. The performance of the method is demonstrated experimentally on a 2.3-Ah lithium-ion iron phosphate cell fitted with surface and core thermo-couples for validation Manuscript profile

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11 - Design and simulation of a low-noise low-power narrowband amplifier (LNA) in 180 nm CMOS technology
Esmail Karimi

Abstrac: In this paper presented discussed to design a low noise amplifier (LNA) with inductor at source in TSMC 0.18um CMOS technology to 2.4 GHz. Cascode structure cause reduces the power consumption of the circuit[1]; the advantage of using cascade structure, increas More

Abstrac: In this paper presented discussed to design a low noise amplifier (LNA) with inductor at source in TSMC 0.18um CMOS technology to 2.4 GHz. Cascode structure cause reduces the power consumption of the circuit[1]; the advantage of using cascade structure, increase the output impedance of the circuit impedance increases, increasing the circuit to follow. The circuit presented in this article a low noise amplifier cascoded with inductor in the source along with impedance matching network added in the input and output; and led to 1.6db noise figure and power consumption of 2.1mw achieved, respectively. Add matching networks to a greater degree of freedom in circuit for improved noise figure and power consumption and chip internal area is also reduced. Add the rest of the circuit in addition to reducing power and noise figure considerations in mind we have been able in the desired frequency and reflection coefficient in the input circuit respectively 20db and -12db achieved. Manuscript profile

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12 - Robust DOA Estimation in the Presence of Mutual Coupling effect with Application in Auxiliary Vehicle Positioning
Zahra Dehghani Naser Parhizgar Hamid Azad

As an important branch of the Internet of Vehicles (IoV), vehicle positioning has drawn extensive attention. Traditional positioning systems based on a global positioning system incur long delays, and may fail due to obstructions. In this article, we propose an auxiliar More

As an important branch of the Internet of Vehicles (IoV), vehicle positioning has drawn extensive attention. Traditional positioning systems based on a global positioning system incur long delays, and may fail due to obstructions. In this article, we propose an auxiliary positioning architecture, whose core is to estimate the direction of arrival (DOA) of signals from landmarks, such as wireless access points, utilizing a sensor array in the vehicle. Due to space limitations, the array may be placed in an arbitrary geometry and may suffer from mutual coupling effects, and it is possible that the effect of mutual coupling between the array elements greatly reduces the independence of the elements of the array, and this effect involves the interaction of each element with its nearby objects. Mutual coupling in antenna arrays can critically degrade the performance of signal processing algorithms. In this paper, a new and accurate form of mutual impedance matrix (MIM) is used to compensate for the effect of mutual coupling in uniform linear arrays (ULA) by a new method based on solving the boundary value problem for all array elements. By using the MIM in the DOA estimation algorithms, these algorithms will be robust to the mutual coupling effect. The simulation results confirm the performance improvement of the proposed DOA estimation algorithm. The proposed architecture can obtain robust self-localization with existing vehicular ad hoc networks, and it can collaborate with other positioning systems to provide a safe driving environment. Manuscript profile

Open Access Article

13 - Design of a High Step-up DC-DC Converter Based on QZSI with Low Voltage Dtress by Using Coupled Inductor Technique
Jafari Hosein Mahdi Shaneh Tohid Nouri

High step-up structures are commonly used to upgrade the low voltage levels generated by renewable energy sources. In this paper, a high step-up structure based on Quasi Z-Source network is presented, which has a simple yet functional structure consisting of two inducto More

High step-up structures are commonly used to upgrade the low voltage levels generated by renewable energy sources. In this paper, a high step-up structure based on Quasi Z-Source network is presented, which has a simple yet functional structure consisting of two inductors and two capacitors. Due to the duty cycle of about 50% for this converter, the problems of reverse recovery of diodes and stability are solved. In addition, the common ground of the power switch and the input source simplifies the control circuit. Using the coupled inductor technique as well as the voltage multiplier cell, the converter voltage gain increases significantly. In addition, the stacked capacitor is used to limit the voltage stress on the switch. The use of the proposed structure increases the voltage gain of the converter. The proposed structure also reduces the level of voltage stress on the semiconductors of the circuit, which reduces the cost and increases the efficiency of the circuit. The converter designed with 25V/ 400V input/ output 100Wouput power is simulated in PSpice software and the results are presented. Manuscript profile

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14 - Harmonic Compensation and Micro-Grid Voltage and Frequency Control Based on Power Proportional Distribution with Adaptive Virtual Impedance Method
Monir Kamali Bahador Fani Ghazanfar Shahgholian Gevork B. Gharehpetian Masoud Shafiee

Due to the different distances and complexity of micro-grids, the lines impedance varies between the feeders of the distributed generation and the loads. Therefore, conventional droop control method does not have good efficiency in power distribution between distributed More

Due to the different distances and complexity of micro-grids, the lines impedance varies between the feeders of the distributed generation and the loads. Therefore, conventional droop control method does not have good efficiency in power distribution between distributed generation (DG) units. Generally, due to simplification, the impedance of the lines is not considered in a complex. The stated conditions greatly reduce the accuracy and speed of the dynamic response of the control system. In this paper, harmonic compensation, voltage and frequency control of micro-grid with adaptive virtual impedance method based on proportional power distribution are presented. In the proposed method, reducing the error coefficient of active power and reactive power, control of voltage and currents’ harmonic in two modes of connection to the main grid and islanded, as well as voltage and frequency control for optimal operation of the micro-grid is presented. The proposed method, without the need to update the impedance information of the feeders, has the capability of optimal operation and power distribution under different operating conditions, taking into account the complex impedance. To validate, the proposed method is simulated in MATLAB/Simulink software environment and the results are presented along with stability and sensitivity analysis. Manuscript profile

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15 - Using Parallel Active Power Filter Based on Voltage Detection on a Radial Distribution Feeder with the Aim of Reducing the Harmonic Propagation and Whack-a-Mole Phenomena
Hamid Reza Ezati Ali Yazdian Varjani

In order to damping of harmonic propagation phenomenon, active power filters are installed on distribution networks. Active power filter installed on buses may cause harmonic oscillation phenomenon and whack-a-mole. In this paper, a parallel active power filter that wor More

In order to damping of harmonic propagation phenomenon, active power filters are installed on distribution networks. Active power filter installed on buses may cause harmonic oscillation phenomenon and whack-a-mole. In this paper, a parallel active power filter that works based on voltage detection and applies with the goal of effective reducing and compensation of harmonic propagation and oscillation has been studied. In this paper two case studies consisting of harmonic current and voltage source connections to radial network has been studied. In this paper using simulation results for a ten-buses radial power distribution feeder in different states of nonlinear load connection - harmonic voltage or current source - by selecting fixed gain that is proportional to the inverse of Characteristic impedance these two phenomena effectively reduced. Due to the variable nature of the characteristic impedance of the power distribution feeder automatic adjusting of active power filter gain will be required regardless of the system conditions.Harmonic destructive currenthas been isolated with voltage detection method using of automatically adjusting of active power filter gain and compensation current is produced in order to control of this gain with the aim of total harmonic distortion decreasing and standardizing. By injection of this compensation current can prevent harmonic propagation and whack-a-mole. Because this method of extracting harmonic current is based on voltage and total harmonic distortion control is known voltage detection method. Manuscript profile

Open Access Article

16 - A Low-Power CMOS Trans-Impedance Amplifier for 2.5 Gb/S Optical Communication Systems
Mojgan Mohseni Mehdi Dolatshahi

This Paper presents a new Trans-impedance amplifier for optical receiver circuits. The amplifier is based on parallel (R-C) feedback topology which is optimized for power consumption and uses shunt-peaking technique to enhance the frequency bandwidth of the amplifier. H More

This Paper presents a new Trans-impedance amplifier for optical receiver circuits. The amplifier is based on parallel (R-C) feedback topology which is optimized for power consumption and uses shunt-peaking technique to enhance the frequency bandwidth of the amplifier. However, the circuit is designed and simulated using 0.18µm CMOS technology parameters. As simulation results show, the amplifier has a gain of 67.5dBΩ, bandwidth of 3GHz while consumes only 12.16 mW power which shows a very good performance for using in a 2.5Gb/S (SONET OC-48) optical communication system. Finally, as the simulated Eye-Diagram shows, the circuit has a very good performance for a 2.5Gb/S system for a 10µA input current. Manuscript profile

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17 - Design and Simulation of a Low-Noise Amplifier (LNA) with low power consumption and high gain in 2.4GHz frequency for wireless systems
Esmaeel Karimi Ebrahim Borzabadi

Abstract: This paper presents the design and simulation of low-noise amplifier (LNA) with .18CMOS technology in 2.4GHz frequency addressed, the process HSPICE RF simulation software has been done. Using cascode structure leads to lower power consumption with higher volt More

Abstract: This paper presents the design and simulation of low-noise amplifier (LNA) with .18CMOS technology in 2.4GHz frequency addressed, the process HSPICE RF simulation software has been done. Using cascode structure leads to lower power consumption with higher voltage gain and power gain. Matching network was used in the design of this circuit has a very good improves on the parameter S11 and allows to have a good control on the real part of the impedance of circuit by appropriate selection of matching network in input and output. By right choosing of circuit elements in this structure can have an approllllojjpriate compromise among the circuit parameters like noise figure, gain, power and stability to reaching noise figure (NF), input reflection coefficient and low power consumption with high gain. In the 2.4GHz frequencyl with 1.8V supply voltage and 1.9 mW power consumption, the circuit parameters are: NF=1.21dB, Av=28.dB, S11=-29.25dB, S12=-35.49dB, S21=18.46dB Manuscript profile

Open Access Article

18 - Design and Simulation of a Novel UWB Bandpass Filter with Compact Size, Wide Upper Stopband and Four Mode-Resonances in Passband
Mahsa Gholipoor Mohammad Amin Honarvar

In this paper, a novel microstrip-line Ultra Wide Band (UWB) band-pass filter using two symmetric Multi – Mode Resonators (MMR) loaded with step impedance stub, is designed, analyzed and simulated. The proposed MMR, comprised of triple – mode step impedance More

In this paper, a novel microstrip-line Ultra Wide Band (UWB) band-pass filter using two symmetric Multi – Mode Resonators (MMR) loaded with step impedance stub, is designed, analyzed and simulated. The proposed MMR, comprised of triple – mode step impedance resontor, to reduce dimension of filter is folded, and one step impedance stub is located on center of two MMRs. With adding the step impedance stub and appropriate adjusting of it's parameters, one can stablish another mode resonace in the desirable passband, i.e, 3.1 GHz – 10.6 GHz. So, optained good performance of filter, such as: coupling increased well, passbanad became flat as much as possible and stopband became very vast. Finally, using of defected ground structure, increased the coupling between MMRs and feeding lines. The proposed filter to compare with conventional UWB filters has a compact size (is about 16mm×6.7mm), wide upper stopband(up to 20GHz), good performance in passband and high selectivity. Manuscript profile

Open Access Article

19 - Comparative evaluation of impedance, chromogenic and reference methods for identification of Staphylococcus aureus contamination in foods
ALI FAZLARA Mahdi Pourmahi Brujeni ALI Bahadori Rad

Staphylococcus aureus (S. aureus) is one of the three major causes of food poisoning in the world, causing the disease in hundreds of thousands of people every year. Today, due to the production and processing the varieties of different foodstuffs, it is necessary to em More

Staphylococcus aureus (S. aureus) is one of the three major causes of food poisoning in the world, causing the disease in hundreds of thousands of people every year. Today, due to the production and processing the varieties of different foodstuffs, it is necessary to employ faster and more sensitive methods for controlling food quality, to gain the requirements of the regulatory centers. New qualitative control methods can be used for impedance and also for using chromogenic culture media. Their advantage over the reference method is the lack of high-volume laboratory operations and their relatively high rate of achievement. Therefore, evaluation of applying impedance, chromogenic and reference environments in the food quality control was considered. In the present work, 100 samples were evaluated for S. aureus infection by reference, impedance and chromogenic methods. Based on the results, 32, 21 and 57 samples were contaminated by S. aureus, respectively. The statistical analysis by SPSS16 software, using Cochran test showed that there is a significant difference between the three methods in detecting S. aureus (P<0.001). Statistical analysis showed that there is not a significant difference between reference and impedance methods, Although there is significant difference between the chromogenic technique and reference method (P>0.05), which means the reference and impedance methods have the same function and impedance can be used as an alternative technique for the reference method. Also the chromogenic technique could not be used instead of the impedance method. Manuscript profile

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20 - Designing predictive model for microbial load in sausage meat processing with using impedance method and survey on its correlation with reference
Reyhaneh Sororyan Laleh Roomiani Ali Fazlara

The objective of the present study was to employ the technique of Impedance Splitting Method, a technique of high accuracy and sensitivity, in the microbial count and characterization based on their rate of metabolic activity leading to a change in electrical resistance More

The objective of the present study was to employ the technique of Impedance Splitting Method, a technique of high accuracy and sensitivity, in the microbial count and characterization based on their rate of metabolic activity leading to a change in electrical resistance in the shortest possible time. A total bacterial count on samples (n= 80 of sausage) collected during the cold and warm seasons, were evaluated by the standard and the Impedance splitting methods (ISM). Based on the obtained coefficient of determination results in the resulting mathematical equations, the correlation coefficient between the two methods in relation to the total bacterial count in sausage, in the summer and winter seasons, as well as the cumulative results have been 93.9, 93.1and 95%, respectively. This study suggests that impediometric technique can be used as a rapid and reliable method to accurate estimation of sausage bacterial loads. This initial evaluation of the suitability of indirect impedance to generate microbial growth data in complex food matrices indicates significant potential for the technology as an alternative to plating methods. Manuscript profile

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21 - ساخت و ارزیابی الکتروشیمیایی سل خورشیدی رنگینه‌ای حساس شده با رنگینه استخراجی از چای ترش بر پایه الکترودهای تیتانیم دی اکسید نانوساختار
سید احمد مظفری مهسا سعیدی رضا رحمانیان

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22 - اثر رنگدانه‌های طبیعی بر عملکرد سلول‌های خورشیدی رنگدانه‎ای
مهدی شهیدی زندی قاسم گلستانی محمدرضا غلامحسین‌زاده

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23 - Determine the Impedance Value of Fault Current Limiter (FCL) in Electric Power System
سید محمود مدرسی حمید لسانی

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24 - Effects of Type and Amount of Fault Current Limiter Impedance on Stability of System after Short Cicuit Fault Occurance in Power Network
سید محمد رضا مدرسی سید محمود مدرسی

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25 - Investigation of Corrosion Inhibition of Two Thiazole Derivatives for AISI Steel Alloy in HCl Solution
ایمان دانایی Alireza Hoseizadeh Mohammad Hossein Maddahy

In most industrial processes, acidic solution are commonly used for the pickling, industrial acid cleaning, acid descaling, oil well acidifying, etc. Corrosion prevention systems favor the use of corrosion inhibitors with low or zero environmental impacts. In this work, More

In most industrial processes, acidic solution are commonly used for the pickling, industrial acid cleaning, acid descaling, oil well acidifying, etc. Corrosion prevention systems favor the use of corrosion inhibitors with low or zero environmental impacts. In this work, the inhibition ability of 2-Mercaptobenzothiazole (MBT) and 2-amino-5-nitrothiazole (Nitramine) (two thiazole derivatives) against the corrosion of AISI steel 4130 in 1 M HCl solution were evaluated by polarization and electrochemical impedance spectroscopy (EIS). Polarization studies indicated that MBT retards both the cathodic and anodic reaction and Nitramine retards anodic reaction through chemical adsorption and blocking the active corrosion sites. EIS data was analyzed to equivalent circuit model shows that as the inhibitor concentration increased the charge transfer resistance of steel increased whilst double layer capacitance decreased. Thermodynamic parameters such as activation energy, enthalpy, entropy and free energy of adsorption were calculated and Atomic force microscopy (AFM) was used to study the steel surface with and without inhibitors. Manuscript profile

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26 - The Investigation of Sensitization Effect on the Corrosion Behavior of SAF 2205 Duplex SS at Transpassive Region
خشایار مرشدبهبهانی پوریا نجفی سیار محمود پاکشیر

In this study, intergranular corrosion (IGC) behaviour of SAF 2205 duplex stainless steels (DSS) was investigated in the "2M H2SO4 + 1M HCl" solution at 30 ◦C using potentiodynamic polarization, DLEPR, X-ray diffraction, electrochemical impedance spectroscopy (EIS) and More

In this study, intergranular corrosion (IGC) behaviour of SAF 2205 duplex stainless steels (DSS) was investigated in the "2M H2SO4 + 1M HCl" solution at 30 ◦C using potentiodynamic polarization, DLEPR, X-ray diffraction, electrochemical impedance spectroscopy (EIS) and cyclic polarization tests. The EIS test results of the specimens, with various degrees of sensitization for 1 h and 5 h at 725 oC, shows three different responses in the trans passive region depending on the applied DC bias. Moreover, the results indicate that the charge transfer and polarization resistance (Rct and RP) of the sensitized DSS specimens decrease as a result of increasing the sensitization time which is in accordance with the optical and SEM micrographs from the corroded samples surfaces. Manuscript profile

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27 - Corrosion behavior of magnetron sputtered tantalum coating
Mostafa Alishahi Farzad Mahboubi Seyed Mohammad Mousavi Khoie

In this study, tantalum (Ta) thin film was deposited on Si(100) and 316L stainless steel (SS) substrates by DC magnetron sputtering. The structural properties of Ta film were investigated by X-ray diffraction analysis. In addition, the scanning and transmission electron More

In this study, tantalum (Ta) thin film was deposited on Si(100) and 316L stainless steel (SS) substrates by DC magnetron sputtering. The structural properties of Ta film were investigated by X-ray diffraction analysis. In addition, the scanning and transmission electron microscopies as well as atomic force microscopy were used to study the cross-section and the morphology of the coating. The corrosion behavior of the bare and Ta-coated 316L SS was evaluated by potentiodynamic polarization test. The electrochemical impedance spectroscopy was employed to study the corrosion mechanisms. The results revealed that the structure of Ta coating on either Si and SS substrates is a mixture of α+β phases, while pre-deposition of a thin tantalum nitride seed layer causes to the deposition of pure α-Ta and decrease the sheet resistance from 90 µΩ.cm to 15 µΩ.cm. Microscopic evaluations shows that the Ta coating is compact, homogeneous and defect-free, exhibiting a columnar structure with a surface roughness of less than 6 nm. Furthermore, the corrosion studies show that the Ta coating perform as a physical barrier between corrosive electrolyte and substrate and, in this way, provide a protective efficiency of more than 70%. In this regard, the diffusion of corrosive electrolyte toward the substrates through open porosities was found to be the corrosion mechanism of the Ta coating and the porosity index of the coating was calculated to be about 6%. Manuscript profile

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28 - Investigation of adding TiO2 nanoparticles on the electrical conductivity of RGO_ZnO nanocomposite
Najme lotfian امیرعباس نوربخش پریسا مشایخی سارا عباسپور سید مهدی میرهادی سعید جبارزارع

This present research was related to electrical conductivity of RGO-ZnO-TiO2 nanocomposite in comparison RGO-ZnO nanocomposite . In order to carry out this research, at first graphene oxide was synthesized by using modified Hummer method and reduction of graphene oxide More

This present research was related to electrical conductivity of RGO-ZnO-TiO2 nanocomposite in comparison RGO-ZnO nanocomposite . In order to carry out this research, at first graphene oxide was synthesized by using modified Hummer method and reduction of graphene oxide (reduced graphene oxide(RGO), was done by UV light and temperature. TiO2 and ZnO nanoparticles were synthesized by sol-gel method.XRD,FTIR and DRSUV were used to investigate these nanoparticles. For sample preparation ,dip coating method was used and all particles were coated on the surface of FTO respectively. for investigation of adding TiO2 nanoparticles on the electrical conductivity and amount of band gap of RGO-ZnO nanocomposite, electrochemical impedance spectroscopy and talc plot were used . The results of comparison between these 2 samples showed that adding TiO2 nanoparticle to RGO-ZnO nanocomposite reduced band gap from 3.22 to 3.11 and increase resistance from 2.8*104Ω to 5.76*104Ω . with study of level energy of RGO, ZnO and TiO2 nanoparticles ,the reason of increasing resistance related to higher ZnO energy level in comparison to TiO2 energy level and electron Inability to overcome of this level energy in the absence of UV light .with putting this sample under UV light could be reduced this resistance. Manuscript profile

Open Access Article

29 - Theoretical and experimental study of Imidazolium Ionic Liquid Effect on the Corrosion Inhibition of 316-Stainless Steel, Using Electrochemical Test Methods and Quantum Mechanics Theories
Reza Safari ALI EHSANI Hamid Ebrahimi

In this study, the impact of )1-Buthyl-3-methyl imidazoloum hexa fluorophosphatesas( a new inhibitor on the corrosion of stainless steel 316L (SS) in HCl solution was investigated by means of potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). More

In this study, the impact of )1-Buthyl-3-methyl imidazoloum hexa fluorophosphatesas( a new inhibitor on the corrosion of stainless steel 316L (SS) in HCl solution was investigated by means of potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Also, the absorption of inhibitor onto the SS surface followed the Langmuir absorption model with the free energy of absorption ΔG0adsof -8.57 kJ mol-1. In addition, using density function theory (DFT) and atoms-in-molecule (AIM) theories, introduced by Richard Bader, which is a generalization of quantum theory to proper nano-size and molecular systems, the electronic organic-structure and local charge/energy transfer in the imidazole molecular system (as a organic-corrosion inhibitor element) are studied. In the same vein, the atomic electronic properties (such as electron density and its Laplacian), and the HOMO–LUMO gap (HLG) of this organic-molecular system are calculated. The results of the investigation show that proposed compound, as a commodious/economical -green inhibitor, has excellent inhibiting properties for SS corrosion in acidic solution. Furthermore, quantum mechanical results show that nitrogen atoms play domain role in intra-molecular charge and energy transfer (and thus electrochemical mechanism) in this inhibitor. Manuscript profile

Open Access Article

30 - Corrosion evaluation of industrial inorganic base coating on reinforcement by electrochemical impedance spectroscopy
Yadollah Yaghobinejad Abdollah Afshar Abolghasem Dolati

In this study, the effect of several industrial protective coatings such as alkyd base primer, zinc rich primer and polyamide primer coatings in compassion with the surface paints comprising alkyd, polyamide and polyamine were investigated. For evaluating corrosion and More

In this study, the effect of several industrial protective coatings such as alkyd base primer, zinc rich primer and polyamide primer coatings in compassion with the surface paints comprising alkyd, polyamide and polyamine were investigated. For evaluating corrosion and durability of concrete properties, strength of mixture, electrochemical impedance spectroscopy (EIS) and pull of test was accomplished. The outcomes significantly demonstrated EIS method performs an excellent response to corrosion analysis of coating upon the rebar. Beside, in harsh media the two parts of isocyanide-acrylic coating with a surface resistance approximately 7.3 GΩ.cm2 shows the best manner. In this study, the effect of several industrial protective coatings such as alkyd base primer, zinc rich primer and polyamide primer coatings in compassion with the surface paints comprising alkyd, polyamide and polyamine were investigated. For evaluating corrosion and durability of concrete properties, strength of mixture, electrochemical impedance spectroscopy (EIS) and pull of test was accomplished. The outcomes significantly demonstrated EIS method performs an excellent response to corrosion analysis of coating upon the rebar. Beside, in harsh media the two parts of isocyanide-acrylic coating with a surface resistance approximately 7.3 GΩ.cm2 shows the best manner Manuscript profile

Open Access Article

31 - Investigation of the Intergranular Corrosion Behavior of UNS S42000 Martensitic Stainless Steels Using Potentiodynamic Electrochemical Impedance Spectroscopy
Khashayar Morshed-Behbahani Pooria Najafisayar Mahmoud Pakshir Nika Zakerin

10.30495/apme.2021.1908777.2012

In this research, UNS S42000 martensitic stainless steel (SS) samples were subjected to tempering heat treatment at constant temperature of 550 oC for different time duration, ranging between 0.5 and 24 h, so as to assess the intergranular corrosion (IGC) behavior of th More

In this research, UNS S42000 martensitic stainless steel (SS) samples were subjected to tempering heat treatment at constant temperature of 550 oC for different time duration, ranging between 0.5 and 24 h, so as to assess the intergranular corrosion (IGC) behavior of the alloy. The microstructural characteristics and electrochemical properties of the alloys were evaluated using scanning electron microscopy (SEM) and anodic polarization method, respectively. The localized attack of the samples was investigated by potentiodynamic electrochemical impedance spectroscopy (PD-EIS) in the transpassive potential region. The results indicated that tempering up to 2 h would be followed by severe intergranular attack at martensite lath interfaces; however, the effect of tempering on corrosion performance of the alloys would be suppressed at prolonged tempering due to desensitization. Moreover, the PD-EIS results revealed that the charge transfer resistance (Rct) values of specimens at 1.10 V can be employed as a primary criterion in order to assess the localized attack of the martensitic SS. In this regard, the lower the Rct value at this DC bias potential, the lower the corrosion resistance to the IGC. These results were in good agreement with the SEM morphologies from the surfaces of corroded samples, indicating uniform corrosion, severe attack and desensitization for samples experiencing no-tempering, short tempering time and prolonged tempering, respectively. Manuscript profile

Open Access Article

32 - Effect of Protective Behaviour of Biofilm Formed By the Anaerobic Sulfate-Reducing Bacteria on the Corrosion Resistance of the API X42 Microalloyed Steel
mojtaba Baghalzadeh Khalilollah Gheisari Hossien Motamedi

10.30495/apme.2021.1927007.2045

In this study, the protective behavior of the biofilm produced on the surface of the API X42 micro-alloyed pipeline steel by the bacterium clostridium sp. as an anaerobic sulfate-reducing bacteria (SRB) is evaluated in a saline simulated soil solution in comparison More

In this study, the protective behavior of the biofilm produced on the surface of the API X42 micro-alloyed pipeline steel by the bacterium clostridium sp. as an anaerobic sulfate-reducing bacteria (SRB) is evaluated in a saline simulated soil solution in comparison with the sterile medium. Microstructure and surface morphology was examined by field emission scanning electron microscopy (FESEM) coupled with energy dispersive spectroscopy (EDS). Corrosion properties were investigated using linear polarization and electrochemical impedance spectroscopy (EIS). The results approve the formation of a biofilm consisting of bacterial cells, extracellular polymeric substance (EPS), and corrosion products. In this relatively dense biofilm, semiconductive iron sulfide which is destructive to the corrosion behavior of biofilm is not observed. In addition, the biofilm produced on the metal surface at immersion time of 21 days in the bacterial inoculated medium improves polarization resistance to 7330 Ω.cm2, while at this time the polarization resistance of the protective corrosion products layer created in the sterile condition is about 1421 Ω.cm2. This comparison shows a 5-fold improvement in corrosion resistance as a result of the biofilm's protective behavior. Manuscript profile

Open Access Article

33 - Fabrication and Optimization of Humidity Sensor Based on Porous Nanostructure Tungsten Tri‌oxide / Silver Nanoparticles
Ayub Karimzad Ghavidel Gholamreza Kiani Mahsa Mahdavinia

The aim of this research is to fabricate a moisture sensor based on porous nanostructure of pure tungsten trioxide (WO3) and doped with silver nanoparticles (SN), and to use the properties of ohmic changes, capacitance and impedance versus moisture as output. The struct More

The aim of this research is to fabricate a moisture sensor based on porous nanostructure of pure tungsten trioxide (WO3) and doped with silver nanoparticles (SN), and to use the properties of ohmic changes, capacitance and impedance versus moisture as output. The structural characteristics of the prepared nanocomposite were examined by a scanning electron microscope and X-ray diffraction spectroscopy. The results showed that synthetic WO3 is in the form of spheres with dimensions of 3 to 7 μm, with a surface porous structure in size of 10 to 60 nm. To fabricate the sensors, first the materials were mixed and dispersed, then coated on the interdigitated electrode by sedimentation method. The investigation showed that the doped sensor with SN have a better performance in comparison with WO3 sample. Its sensitivity was obtained 4.4 and 0.68 MΩ/%RH for the relative humidity range of 20-50% and 50-90%, respectively, improved 7 and 5% compared to similar previous samples. The response and recovery time of this sensor was measured approximately 2 and 7 seconds, which is 37.5 and 41.4 times smaller than available samples, respectively. Decreasing the capacitance of the sensor to 3800 Pf by increasing the relative humidity to 90% is another finding. Significant impedance changes of the sensor versus the humidity alternations is other important result, showing that the impedance can be considered as a sensor output by compensating for errors of ohmic changes and capacitance. Manuscript profile

Open Access Article

34 - بررسی و مقایسۀ رفتار خوردگی آلیاژ منیزیم AZ91 ریختگی و تغییرفرم‌یافته به‌روش اکستروژن‌برشی‌ساده
محمود پاکشیر رامینه مدحت خشایار مرشدبهبهانی

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Open Access Article

35 - The Effect of ARB Process on the Corrosion Behavior of the Al-nano
سینا متین محمود پاکشیر رضا بازرگان لاری خشایار مرشد‌بهبهانی

The Effect of ARB Process on the Corrosion Behavior of the Al-nano

The Effect of ARB Process on the Corrosion Behavior of the Al-nano Manuscript profile

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