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Numerical analyses of dynamic response of geosynthetic-reinforced soil retaining wall
Tohid Akhlaghi,Ali Nikkar 한국자원공학회 2014 Geosystem engineering Vol.17 No.2
Reinforced soil retaining walls have recently become widespread due to their advantages over conventional retaining walls. In this paper, numerical analyses, using Fast Lagrangian Analysis of Continua software, have been used to investigate the influence of mechanical and geometrical properties of the wall and amplitude and frequency of the source vibration on the dynamic behavior of a geosynthetic-reinforced soil retaining wall. The results show that the type of facing affects the general form of deformation. Also the wall displacement decrease with increase in reinforcement stiffness and length. Any increase in the acceleration amplitude increase the wall displacement and reinforcement loads. The difference between the frequency of the base excitation and the natural frequency of the model is the most important factor determining the wall dynamicresponse.
Manganese ferrite (MnFe2O4) Nanoparticles: From synthesis to application -A review
Neda Akhlaghi,Ghasem Najafpour Darzi 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.103 No.-
Manganese ferrite (MnFe2O4) nanoparticle, a spinel ferrite nanomaterial, is one of the important magneticmetal oxide nanoparticles with distinctive physical and chemical properties. This nanoparticlecan be easily synthesized through various methods with controllable size and desired morphology. MnFe2O4 is an efficient candidate for various applications like biomedical, analytical, and storage devices. In this review, several synthesis methods and physicochemical properties of MnFe2O4 nanoparticles arediscussed. Then, a comprehensive overview of the latest and most promising researches on massiveapplications of MnFe2O4-based nanostructures, including hyperthermia cancer therapy, magnetic resonanceimaging (MRI), energy conversion and storage devices like Lithium-ion batteries and supercapacitors,as well as catalytic activities, sensors, hydrogen production, heavy metal removal, and drug deliveryare presented. Overall, herein, a deep understanding of the unlimited ability of MnFe2O4 nanoparticles indiverse applications is provided.
Fuzzy Adaptive Modified PSO-Algorithm Assisted to Design of Photonic Crystal Fiber Raman Amplifier
Majid Akhlaghi,Farzin Emami 한국광학회 2013 Current Optics and Photonics Vol.17 No.3
This paper presents an efficient evolutionary method to optimize the gain ripple of multi-pumps photonic crystal fiber Raman amplifier using the Fuzzy Adaptive Modified PSO (FAMPSO) algorithm. The original PSO has difficulties in premature convergence, performance and the diversity loss in optimization as well as appropriate tuning of its parameters. The feasibility and effectiveness of the proposed hybrid algorithm is demonstrated and results are compared with the PSO algorithm. It is shown that FAMPSO has a high quality solution, superior convergence characteristics and shorter computation time.
Simulation and Optimization of Nonperiodic Plasmonic Nano-Particles
Majid Akhlaghi,Farzin Emami,Mokhtar Sha Sadeghi,Mohammad Yazdanypoor 한국광학회 2014 Current Optics and Photonics Vol.18 No.1
A binary-coupled dipole approximation (BCDA) is described for designing metal nanoparticles with nonperiodic structures in one, two, and three dimensions. This method can be used to simulate the variation of near- and far-field properties through the interactions of metal nanoparticles. An advantage of this method is in its combination with the binary particle swarm optimization (BPSO) algorithm to find the best array of nanoparticles from all possible arrays. The BPSO algorithm has been used to design an array of plasmonic nanospheres to achieve maximum absorption, scattering, and extinction coefficient spectra. In BPSO, a swarm consists of a matrix with binary entries controlling the presence (‘1’) or the absence (‘0’) of nanospheres in the array. This approach is useful in optical applications such as solar cells, biosensors, and plasmonic nanoantennae, and optical cloaking.
( Behzad Akhlaghi ),( Gholam Reza Ghorbani ),( Masoud Alikhani ),( Shahryar Kargar ),( Ali Sadeghi-sefidmazgi ),( Hassan Rafiee-yarandi ),( Pedram Rezamand ) 한국축산학회 2019 한국축산학회지 Vol.61 No.6
The interactive effect of dietary fat supplementation and milk yield level on dairy cows performance under heat stress has not been thoroughly investigated. The purpose of this study was to evaluate the effect of production level, the source of fat supplements and their interaction on dairy cows performance under heat stress. In this study, 64 Holstein multiparous cows were divided into 2 groups and received one of two rations having either calcium salts of fatty acids (Ca-FA) or high-palmitic acid (PA) supplements (2.8% of DM; dry matter). After completing the experiment and based on maturity-equivalent milk, cows were divided into two groups of high-yielding (14,633 kg) and medium-yielding (11,616 kg). Average temperature humidity index (THI) was 71 during the trial period. Apparent digestibility of dry matter (p = 0.04), organic matter (p = 0.05), and neutral detergent fiber (NDF; p = 0.04) for cows fed Ca-FA were greater than cows fed PA. The milk fat content in high-producing cows was 0.3% greater than medium-producing cows (p = 0.03). The milk protein content in cows fed Ca-FA was greater than cows fed PA (p < 0.01). High-producing cows had greater serum cholesterol (p = 0.02) than medium-producing cows. The cows fed PA tended to have a greater BUN than cows fed Ca-FA (p = 0.06). Alanine aminotransferase and aspartate aminotransferase tended to be increased by PA, which indicates that cows in PA treatment may have experienced more adverse effect on the liver function than cows on Ca-FA. Therefore, under heat stress and in 90 d trial, milk production level does not affect the cows’ response to PA or Ca-FA. Although cows fed Ca-FA received lower energy than those fed PA, they compensated for this shortage likely with increasing the digestibility and produced a similar amount of milk.
Ali Gharibi,Benyamin Akhlaghi,Mohsen Abbasi 대한환경공학회 2022 Environmental Engineering Research Vol.27 No.2
The present research introduces adsorption of sulfonated cobalt phthalocyanine catalyst (Europhtal) from the real wastewater that is produced in the mercaptan removal unit (Merox) of the third refinery, South Pars Gas Complex (SPGC), Assaluyeh, Iran. Therefore, novel low-cost natural zeolite modified with polyaluminium chloride (PAC) was investigated as an adsorbent for the treatment of Europhtal wastewater. Central composite design (CCD), as a set of response surface methodology (RSM), was applied to acquire optimum operational conditions such as contact time, pH, adsorbent dosage, and Europhtal concentration. Results showed that the removal percentage of Europhtal in the real wastewater was 93.4% at best operating condition consisting of a pH of 6.7, sonication time of 8 min, 0.035 g of adsorbent. The obtained results were evaluated by adsorption isotherms and kinetic parameters. It was found that the equilibrium data matched the Freundlich model acceptably, with the maximum experimental adsorption capacity of this model was 687.51 mg g<SUP>-1</SUP> at 301.15 K. From the kinetic data, it was revealed that the adsorption process followed the pseudo-second-order kinetic model. Furthermore, the obtained thermodynamic parameters such as ΔH°, ΔS°, and ΔG° imply the endothermic essence of adsorption proceeding spontaneously.
Amirhossein Ahbab,Tohid Akhlaghi,Mir Jafar Sadegh Safari,Eyubhan Avci 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.2
Excavation on the inclined surfaces on the dam reservoir and rising water level may also affect the slope stability of the inclined surfaces in the dam reservoir under static and dynamic conditions. In this study, it is aimed to present a three-dimensional (3D) model to analyze slope stability of access road to the dam’s crest and calculates the value of FOS in process of instructing and exploitation of dam and estimating the possibility of landslide occurrence during excavations and impounding of the dam. To this end, analysis of the slope stability has been implemented based on the information obtained from the field inspections, investigations, geological surveys, manual and mechanical borings in laboratory and field experiments. For acquiring the value of factor of safety (FOS), an explicit-finite-difference code is implemented. Effects of excavations in different levels of slope and fluctuation of water table in instability of the slope have been analyzed. The outcomes reveal that through increasing the level of water, FOS is decreased and large amounts of soil were entered in the dam’s reservoir, blocking the entrance of the drainage valve and disrupt access way to the dam crest. Therefore, piles in the different distance have been used for controlling the slope stability and the best distribution of piles based on acceptable values for factor of safety in different regulations have been determined. It was observed that the excavation on the slope and increment of the water level in the dam reservoir influence the slope stability.