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Crystalline texture evolution, control of the tribocorrosion behavior, and significant enhancement of the abrasion properties of a Ni-P nanocomposite coating enhanced by zirconia nanoparticles

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International Journal of Minerals,Metallurgy and Materials 2019年第8期26卷 1020-1030页

作者： Masoud Sabzi Saeid Mersagh dezfuli Zohre Balak Young Researchers and Elite Club Dezful BranchIslamic Azad UniversityDezful ***Iran Department of Materials Science and Engineering Science and Research BranchIslamic Azad UniversityTehran ***Iran Department of Materials Science Islamic Azad UniversityAhwaz ***Iran

This paper describes an investigation of the effect of ZrO2 nanoparticles on the abrasive properties,crystalline texture developments,and tribocorrosion behavior of Ni-P nanostructured *** the investigation,Ni-P and Ni-P-ZrO2 nanostructured coatings are deposited on St52 steel via the electroless *** electron microscopy(TEM),field emission scanning electron microscopy(FE-SEM),X-ray diffraction(XRD),energy dispersive spectroscopy(EDS),cyclic-static polarization tests in 3.5wt%NaCl solution,the tribocorrosion test(by back-and-forth wear in electrochemical cell),and the microhardness test using the Vickers method were performed to characterize and analyze the deposited *** results of this study showed that the addition of ZrO2 nanoparticles to the Ni-P electroless bath produced the following:a sharp increase in wear and hardness resistance,the change of the wear mechanism from sheet to adhesive mode,the reduction of pitting corrosion resistance,significant reduction in the tribocorrosion protective properties,change in the preferred orientation of the crystalline texture coating from(111)to(200),increase in the sedimentation rate during the deposit process,and a sharp increase in the thickness of the Ni-P nanostructured coatings.

关键词： Ni-P nanocomposite coatings ZrO2 nanoparticles crystalline texture corrosion resistance abrasive properties tribocorrosion behavior

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FSPAM:A Feature Construction Method to Identifying Cell Populations in ScRNA-seq Data

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Computer Modeling in Engineering & Sciences 2020年第1期122卷 377-397页

作者： Amin Einipour Mohammad Mosleh Karim Ansari-Asl Department of Computer Engineering Dezful BranchIslamic Azad UniversityDezfulIran Department of Electrical Engineering Faculty of EngineeringShahid Chamran University of AhvazAhvazIran

The emergence of single-cell RNA-sequencing(scRNA-seq)technology has introduced new information about the structure of cells,diseases,and their associated biological *** of the main uses of scRNA-seq is identifying cell populations,which sometimes leads to the detection of rare cell ***,the new method is still in its infancy and with its advantages comes computational challenges that are just beginning to *** important tool in the analysis is dimensionality reduction,which transforms high dimensional data into a meaningful reduced *** technique allows noise removal,visualization and compression of high-dimensional *** paper presents a new dimensionality reduction approach where,during an unsupervised multistage process,a feature set including high valuable markers is created which can facilitate the isolation of cell *** proposed method,called fusion of the Spearman and Pearson affinity matrices(FSPAM),is based on a graph-based Gaussian *** of the graph theory can be effective to overcome the challenge of the nonlinear relations between cellular markers in scRNA-seq ***,with a proper fusion of the Pearson and Spearman correlation coefficient criteria,it extracts a set of the most important features in a new *** fact,the FSPAM aggregates the various aspects of cell-to-cell similarity derived from the Pearson and Spearman metrics,and reveals new aspects of cell-to-cell similarity,which can be used to extract new *** results of the identification of cell populations via k-means++clustering method based on the features extracted from the FSPAM and different datasets of scRNA-seq suggested that the proposed method,regardless of the characteristics that govern each dataset,enjoys greater accuracy and better quality compared to previous methods.

关键词： Single cell RNA sequencing cell population feature extraction fusion

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Microwave-assisted efficient synthesis of azlactone derivatives using 2-aminopyridine-functionalized sphere SiO_2 nanoparticles as a reusable heterogeneous catalyst

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Chinese Chemical Letters 2015年第5期26卷 557-563页

作者： Akbar Mobinikhaledi Hassan Moghanian Samira Pakdel Department of Chemistry Faculty of ScienceArak University Department of Chemistry Dezful BranchIslamic Azad University

In the present work, the highly efficient Erlenmeyer synthesis of azlactones catalyzed by 2- aminopyridine, supported on nano-sphere Si02 is reported. First, the silica nanoparticles were modified with triethoxysilylpropyl chloride and then 2-aminopyridine was attached to the support via covalent linkages. This new heterogenized catalyst was used for efficient microwave-assisted synthesis of azlactone derivatives with Ac20 as a condensing agent under solvent-free conditions. The present method offers advantages including high yields, short reaction times and simple work-up. Also, the catalyst can be easily recycled and reused several times, which makes this method attractive, economic and environmentally-benign.

关键词： Nano-sphere silica Azlactone Heterogeneous catalyst Erlenmeyer synthesis Microwave irradiation

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A new design of parity-preserving reversible multipliers based on multiple-control toffoli synthesis targeting emerging quantum circuits

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Frontiers of Computer Science 2024年第6期18卷 186908页

作者： NOORALLAHZADEH Mojtaba MOSLEH Mohammad DATTA Kamalika Department of Computer Engineering dezful branch Islamic Azad University German Research Centre for Artificial Intelligence (DFKI) Institute of Computer Science University of Bremen

With the recent demonstration of quantum computers, interests in the field of reversible logic synthesis and optimization have taken a different turn. As every quantum operation is inherently reversible, there is an immense motivation for exploring reversible circuit design and optimization. When it comes to faults in circuits, the parity-preserving feature donates to the detection of permanent and temporary faults. In the context of reversible circuits, the parity-preserving property ensures that the input and output parities are equal. In this paper we suggest six parity-preserving reversible blocks (ZFATSL) with improved quantum cost. The reversible blocks are synthesized using an existing synthesis method that generates a netlist of multiple-control Toffoli (MCT) gates. Various optimization rules are applied at the reversible circuit level, followed by transformation into a netlist of elementary quantum gates from the NCV library. The designs of full-adder and unsigned and signed multipliers are proposed using the functional blocks that possess parity-preserving properties. The proposed designs are compared with state-of-the-art methods and found to be better in terms of cost of realization. Average savings of 25.04%, 20.89%, 21.17%, and 51.03%, and 18.59%, 13.82%, 13.82%, and 27.65% respectively, are observed for 4-bit unsigned and 5-bit signed multipliers in terms of quantum cost, garbage output, constant input, and gate count as compared to recent works.

关键词： reversible circuits parity-preserving NCV library multiple-control Toffoli gates quantum circuits quantum cost

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Effect of 2-mercaptobenzothiazole concentration on sour-corrosion behavior of API X60 pipeline steel:Electrochemical parameters and adsorption mechanism

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International Journal of Minerals,Metallurgy and Materials 2022年第2期29卷 271-282页

作者： Masoud Sabzi Amir Hayati Jozani Farzad Zeidvandi Majid Sadeghi Saeid Mersagh dezfuli Young Researchers and Elite Club Dezful BranchIslamic Azad UniversityDezfulIran Department of Materials Science and Engineering Science and Research BranchIslamic Azad UniversityTehranIran Center of Excellence for Surface Engineering and Corrosion Protection of Industrial School of Metallurgy and Materials EngineeringCollege of EngineeringUniversity of TehranP.O.Box 11155-4563TehranIran

We investigated the effect of the 2-mercaptobenzothiazole concentration on the sour-corrosion behavior of API X60 pipeline steel in an environment containing H_(2)S at 25°C and in the presence of 0,2.5,5.0,7.5,and 10.0 g/L of 2-mercaptobenzothiazole *** examine this behavior,we conducted open-circuit potential(OCP),potentiodynamic polarization,and electrochemical impedance spectroscopy(EIS)*** dispersive spectroscopy and scanning electron microscopy were also used to analyze the corrosion *** results of the OCP and potentiodynamic polarization tests revealed that 2-mercaptobenzothiazole reduces the speed of both the anodic and cathodic *** assessment of the Gibbs free energy of the inhibitor(△G_(ads)^(■))indicated that its value was less than-20 kJ·mol^(-1)and greater than-40 k J·mol^(-1).Therefore,the adsorption of 2-mercaptobenzothiazole onto the surface of the API X60 pipeline steel occurs both physically and chemically,the latter of which is particularly *** addition,as the△G_(ads)^(■)dsvalue was negative,we could conclude that the adsorption of 2-mercaptobenzothiazole onto the surface of the pipeline steel occurs *** EIS results indicate that with the increase in the 2-mercaptobenzothiazole inhibitor concentration,the corrosion resistance of API X60 steel *** analysis of the corrosion products revealed that iron sulfide compounds form on the *** summary,the results showed that an increase in the inhibitor concentration results in a decrease in the corrosion rate and an increase in inhibitory ***,we found that the 2-mercaptobenzothiazole adsorption process on the API X60 steel surfaces in an H2 S-containing environment follows the Langmuir adsorption isotherm and occurs spontaneously.

关键词： API X60 steel sour corrosion 2-mercaptobenzothiazole inhibitor concentration electrochemical parameters environments containing hydrogen sulfide

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Effect of melting temperature on microstructural evolutions, behavior and corrosion morphology of Hadfield austenitic manganese steel in the casting process

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International Journal of Minerals,Metallurgy and Materials 2018年第12期25卷 1431-1438页

作者： Masoud Sabzi Sadegh Moeini Far Saeid Mersagh dezfuli Young Researchers and Elite Club Dezful Branch Islamic Azad University Department of Mechanical Engineering Islamic Azad University Department of Materials Science and Engineering Islamic Azad University

In this study, the effect of melting temperature on the microstructural evolutions, behavior, and corrosion morphology of Hadfield steel in the casting process is investigated. The mold was prepared by the sodium silicate/CO_2 method, using a blind riser, and then the desired molten steel was obtained using a coreless induction furnace. The casting was performed at melting temperatures of 1350, 1400, 1450, and 1500°C, and the cast blocks were immediately quenched in water. Optical microscopy was used to analyze the microstructure, and scanning electron microscopy(SEM) and X-ray diffractrometry(XRD) were used to analyze the corrosion morphology and phase formation in the microstructure, respectively. The corrosion behavior of the samples was analyzed using a potentiodynamic polarization test and electrochemical impedance spectroscopy(EIS) in 3.5 wt% NaCl. The optical microscopy observations and XRD patterns show that the increase in melting temperature led to a decrease of carbides and an increase in the austenite grain size in the Hadfield steel microstructure. The corrosion tests results show that with increasing melting temperature in the casting process, Hadfield steel shows a higher corrosion resistance. The SEM images of the corrosion morphologies show that the reduction of melting temperature in the Hadfield steel casting process induced micro-galvanic corrosion conditions.

关键词： Hadfield steel casting process melting temperature microstructural evolutions corrosion behavior corrosion morphology

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Magnetic and Heat Resistant Poly(imide-ether) Nanocomposites Derived from Methyl Rich 9H-xanthene: Synthesis and Characterization

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Chinese Journal of Polymer Science 2018年第7期36卷 822-834页

作者： Khalil Faghihi Hassan Moghanian Fatemeh Mozafari Meisam Shabanian Organic Polymer Chemistry Research Laboratory Department of Chemistry Faculty of Science Arak University Department of Chemistry Dezful Branch Islamic Azad University Faculty of Chemistry and Petrochemical Engineering Standard Research Institute (SRI)

In this study a new series of magnetic and heat resistant nanocomposites were prepared based on a highly soluble poly（imideether）（PIE） reinforced with two different types of magnetic nanoparticles via a solution intercalation technique. New PIE with good solubility and desired molar mass containing bulky xanthene rings and amide groups in the side chains was synthesized via thermal cyclization of the poly（amic acid） precursor, obtained from the reaction of a new diamine derived from 9H-xanthene and 4,4＇- oxydiphthalic dianhydride （ODPA）. Improved solubility was attributed to the presence of xanthene group and flexible ether linkage in the polyimide backbones that reduce the chain-chain interaction and enhance solubility by penetrating solvent molecules into the polyimide chains. Fe3O4 nanoparticles （MNPs） which synthesized from chemical co-precipitation route were coated with silica （SiO2）, sequentially with （3-aminopropyl）triethoxysilane and poly-melamine-terephthaldehyde （MNPs-PMT）, and then separately dispersed in the poly（amic acid） solutions and thermally imidized to form PIE/Fe3O4 and PIE/MNPs-PMT nanocomposites. The nanostructures and properties of the resultant materials were investigated using FTIR spectroscopy, X-ray diffraction （XRD）, field emission scanning electron microscopy （FE-SEM）, transmission electron microscopy （TEM）, vibrating sample magnetometer （VSM）, thermal gravimetric analysis （TGA） and differential scanning calorimetry （DSC）. The properties of the nanocomposites were strongly related to the dispersion and interaction between the nanoparticles and PIE matrix. The thermogravimetric analysis （TGA） results showed that the addition of MNPs-PMT nanoparticles resulted in a substantial increase in the thermal stability of the corresponding PIEN. The temperature at 10% weight loss （T10） was increased from 416℃to 428℃ for PIEN containing 3 wt% MNPs-PMT as compared to neat PIE, as well the char yield enhanced. Furthermore, the MNPs-PMT nanoparticles

关键词： Poly(imide-ether) Nanocomposite 9H-xanthene Magnetic nanoparticles

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WSN Fault Tolerant Improvement Using Path Redundancy Method

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通讯和计算机（中英文版） 2012年第2期9卷 167-176页

作者： Ali Mojoodi Mohammad Mehrani Faraz Forootan Reza Farshidi Islamic Azad University Dezful Branch Dezful *** Iran Islamic Azad University Shoushtar Branch Shoushtar *** Iran

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New Modeling for Generation of Normal and Abnormal Heart Rate Variability Signals

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Journal of Biomedical Science and Engineering 2014年第14期7卷 1122-1143页

作者： Naser Safdarian Department of Biomedical Engineering Dezful Branch Islamic Azad University Dezful Iran

This research is performed based on the modeling of biological signals. We can produce Heart Rate (HR) and Heart Rate Variability (HRV) signals synthetically using the mathematical relationships which are used as input for the Integral Pulse Frequency Modulation (IPFM) model. Previous researches were proposed same methods such as one model of ECG signal synthetically based on RBF neural network, a model based on IPFM with random threshold, method was based on the estimation of produced signals which are dependent on autonomic nervous system using IPFM model with fixed threshold, a new method based on the theory of vector space that based on time-varying uses of IPMF model (TVTIPMF) and special functions, and two different methods for producing HRV signals with controlled characteristics and structure of time-frequency (TF) for using non-stationary HRV analysis. In this paper, several chaotic maps such as Logistic Map, Henon Map, Lorenz and Tent Map have been used. Also, effects of sympathetic and parasympathetic nervous system and an internal input to the SA node and their effects in HRV signals were evaluated. In the proposed method, output amount of integrator in IPFM model was compared with chaotic threshold level. Then, final output of IPFM model was characterized as the HR and HRV signal. So, from HR and HRV signals obtaining from this model, linear features such as Mean, Median, Variance, Standard Deviation, Maximum Range, Minimum Range, Mode, Amplitude Range and frequency spectrum, and non-linear features such as Lyapunov Exponent, Shanon Entropy, log Entropy, Threshold Entropy, sure Entropy and mode Entropy were extracted from artificial HRV and compared them with characteristics as extracted from natural HRV signal. Also, in this paper two patients that called high sympathetic Balance and Cardiovascular Autonomy Neuropathy (CAN) which is detected and evaluated by HRV signals were simulated. These signals by changing the values of the some coefficients of th

关键词： Artificial HRV Signal Chaotic Map IPFM Model Threshold Level Linear and Non-Linear Feature Extraction Normal and Abnormal HRV Signal

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Designing Wireless Charger Circuit for Hearing Aids Using Radio Frequency Waves

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Journal of Biomedical Science and Engineering 2014年第11期7卷 948-962页

作者： Seyed Ataaldin Mahmoudi Nejad Naser Safdarian Department of Biomedical Engineering Dezful Branch Islamic Azad University Dezful Iran

In this paper, an attempt has been made to produce a recipient system of wireless charge for a simple hearing aid so that electrical signal would be generated through detecting and receiving radio frequency waves (RF). The purpose of this design is to receive wireless charge for hearing aids and basically for any electronic device which is not required to a high energy for being setup. In this study, it has been demonstrated that as the amount of radio receiving energy increases, distance of receiver from antenna should be decreased;otherwise, either maximum amount of the receiving energy, or signal power density of the transmitter should be increased. Since it is impossible to be performed, it is decided to set up an energy receiving system constructed by rectenna and charge Circuit and to adjust their parameters to provide energy requirements for a device with low-power consumption. In this paper, different components of an energy receiving system from radio frequency band have been mentioned and a diagram block has been suggested. Subsequently, input impedance of designed antenna has been adjusted by provided relations. This impedance should be adjusted with the total impedance of regarded hearing aid Circuit by which the highest amount of received signal power is transferred to the battery of hearing aids. Received signal is converted to a dc voltage by rectifier diode. Finally, by applying a voltage regulator which has been designed using a common-collector amplifier not only the output voltage is kept constant, but the power is also strengthened. The battery of the hearing aids will be charged using the obtained power and voltage.

关键词： Radio Frequency Waves (RF) Rectenna Spiral Antenna Charge Circuit Impedance Adjustment or Impedance Matching Array Antenna Regulator Circuit Hearing-Aid Circuit

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