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- 저자 : Barati (검색결과 104 건)
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Barati-Boldaji Reza,Shojaei-Zarghani Sara,Mehrabi Manoosh,Amini Afshin,Safarpour Ali Reza 대한마취통증의학회 2023 Anesthesia and pain medicine Vol.18 No.2
Background: Post-dural puncture headache (PDPH) is one of the most common complications in patients undergoing spinal anesthesia. The present systematic review and meta-analysis aimed to assess the therapeutic and prophylactic effects of aminophylline and theophylline on PDPH.Methods: Relevant studies were identified by searching the following electronic databases, without language restriction, until June 2020: Scopus, EMBASE, MEDLINE, Google Scholar, Web of Science, Cochrane Library-CENTRAL, and CINAHL Complete. Random effects models were used to calculate the standardized mean difference (SMD) and risk ratios (RRs) with 95% confidence intervals (95% CI) to assess the therapeutic and prophylactic effects of aminophylline and theophylline on PDPH, respectively. The Cochrane tool was used for the quality assessment of the included studies. The certainty of the evidence was rated using the Grading of Recommendations Assessment, Development, and Evaluation method.Results: Of the 1,349 initial records, 15 met our eligibility criteria (6 studies on therapeutic and 9 on prophylactic effects). A significant reduction in the pain score was observed following aminophylline/theophylline treatment (SMD = –1.67; 95% CI, –2.28 to –1.05; P < 0.001, I2 = 84.7%; P < 0.001). Subgroup analysis revealed that the therapeutic effect was significantly higher when these agents were compared to placebo than when conventional therapies were used. The risk of PDPH after aminophylline administration was not significantly reduced (RR = 0.74; 95% CI, 0.42 to 1.31; P = 0.290).Conclusions: Theophylline and aminophylline have therapeutic, but not prophylactic, effects on PDPH.
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Barati, Mohammad Reza Techno-Press 2017 Advances in nano research Vol.5 No.4
Forced vibration behavior of porous metal foam nanoplates on elastic medium is studied via a 4-variable plate theory. Different porosity distributions called uniform, symmetric and asymmetric are considered. Nonlocal strain gradient theory (NSGT) containing two scale parameters is employed for size-dependent modeling of porous nanoplates. The present plate theory satisfies the shear deformation effect and it has lower field variables compared with first order plate theory. Hamilton's principle is employed to derive the governing equations. Obtained results from Galerkin's method are verified with those provided in the literature. The effects of nonlocal parameter, strain gradient, foundation parameters, dynamic loading, porosity distributions and porosity coefficient on dynamic deflection and resonance frequencies of metal foam nanoscale plates are examined.
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Barati, Hassan,Ashir, Farshid The Korean Institute of Electrical Engineers 2018 Journal of Electrical Engineering & Technology Vol.13 No.2
Virtual power plants can be regarded as systems that have entered the network after restructure of power systems. In fact, these plants are a set of consumers capable of consuming and generating power. In response to widespread implementation of plug-in hybrid electric vehicles, further investigation of energy management in this type of power plants seems to be of great value. In effect, these vehicles are able to receive and inject power from/into the network. Hence, study of the effects of these vehicles on management of virtual power plants seems to be illuminative. In this paper, management of power consumption/generation in virtual power plants has been investigated in the presence of hybrid electric vehicles. The objective function of virtual power plants problem management is to minimize the overall costs including not only the costs of energy production in power generation units, fuels, and degradation of batteries of vehicles, but also the costs of purchasing electricity from the network. Furthermore, the constraints on the operational of plants, loads and hybrid vehicles, level of penalty for greenhouse gas emissions ($CO_2$ and $NO_x$) produced by power plants and vehicles, and demand response to the immediate price of market have all been attended to in the present study. GAMS/Cplex software system and sample power system have been employed to pursue computer implementation and simulation.
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Hassan Barati,Farshid Ashir 대한전기학회 2018 Journal of Electrical Engineering & Technology Vol.13 No.2
Virtual power plants can be regarded as systems that have entered the network after restructure of power systems. In fact, these plants are a set of consumers capable of consuming and generating power. In response to widespread implementation of plug-in hybrid electric vehicles, further investigation of energy management in this type of power plants seems to be of great value. In effect, these vehicles are able to receive and inject power from/into the network. Hence, study of the effects of these vehicles on management of virtual power plants seems to be illuminative. In this paper, management of power consumption/generation in virtual power plants has been investigated in the presence of hybrid electric vehicles. The objective function of virtual power plants problem management is to minimize the overall costs including not only the costs of energy production in power generation units, fuels, and degradation of batteries of vehicles, but also the costs of purchasing electricity from the network. Furthermore, the constraints on the operational of plants, loads and hybrid vehicles, level of penalty for greenhouse gas emissions (CO₂ and NOx) produced by power plants and vehicles, and demand response to the immediate price of market have all been attended to in the present study. GAMS/Cplex software system and sample power system have been employed to pursue computer implementation and simulation.
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Asma Barati,Elahe Kazemi,ShayesstehDadfarnia,Ali Mohammad Haji Shabani 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.46 No.-
A novel molecular imprinted polymer (MIP) as a SPE sorbent was synthesized for fluoxetine througha coprecipitation method. The synthesized polymer was characterized by Fourier transform infrared(FT–IR) spectroscopy and scanning electron microscopy (SEM). The kinetic and adsorption equilibriumwas studied. Quantification of fluoxetine was done based on the competitive inclusion complexformation of fluoxetine with phenolphthalein-b-cyclodextrin using fiber optic linear array spectrophotometry. The method exhibited a linear dynamic range of 0.8–10.0 mg L 1[1TD$DIF] with a detection limit of0.03 mg L 1 and a preconcentration factor of 500. The developed method was successfully applied todetermine fluoxetine in various samples.
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Micromechanical analysis of unidirectional polymeric composites material with triangular fibers
F. Barati,E. Torabi,H. Veiskarami,A. Khanbabaea Nava,M. M. Attar 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.10
The purpose of this study is to investigate the mechanism of load transfer in unidirectional polymeric composites material with triangular fibers in the presence of broken fibers. It is assumed that all fibers with triangle-cross section lie in a same direction while loaded by a load at infinity. In previous studies, the behavior of polymeric matrix is assumed elastic, while the behavior of most polymeric matrix is elastic-perfect plastic. For this purpose, equilibrium equations by use of shear-lag theory have been derived and by proper using boundary and boundness conditions, displacement field and stress distribution were computed. Finally, the results of stress concentrations and di shear stress, at neighbor of broken fibers for carbon-epoxy composite material were extracted and compared with composite materials with circular fibers. The analytical results are compared to the detailed finite element values. A close match is observed between the two methods.
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Reza Barati 대한토목학회 2015 KSCE JOURNAL OF CIVIL ENGINEERING Vol.19 No.1
Flood routing is a mathematical procedure in order to predict the variation of the magnitude of a flood wave when it propagatesalong natural rivers or artificial channels. The accuracy of flood routing is an important subject for research in the hydrology andhydraulics. This study focuses on the effects of the numerical solution method and the nonlinear storage equation of the Muskingumflood routing procedure. The simulation results indicate that the Tung’s method has better results (up to 41.26-79.47% for thedifferent nonlinear storage equations) than the Fourth-Order Runge-Kutta method. Therefore, the Tung’s method is more accuratethan the other method. Furthermore, based on the previous studies, the Tung’s method has satisfactory results in the field conditionsin both calibration and verification steps. On the other hand, the proposed five-parameter nonlinear storage equation improves fittingto the outflow data by 85.21% than the three-parameter equation.
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The Effect of Soft and Rigid Cervical Collars on Head and Neck Immobilization in Healthy Subjects
Kourosh Barati,Mokhtar Arazpour,Roshanak Vameghi,Ali Abdoli,Farzad Farmani 대한척추외과학회 2017 Asian Spine Journal Vol.11 No.3
Study Design: Whiplash injury is a prevalent and often destructive injury of the cervical column, which can lead to serious neck pain. Many approaches have been suggested for the treatment of whiplash injury, including anti-inflammatory drugs, manipulation, supervised exercise, and cervical collars. Cervical collars are generally divided into two groups: soft and rigid collars. Purpose: The present study aimed to compare the effect of soft and rigid cervical collars on immobilizing head and neck motion. Overview of Literature: Many studies have investigated the effect of collars on neck motion. Rigid collars have been shown to provide more immobilization in the sagittal and transverse planes compared with soft collars. However, according to some studies, soft and rigid collars provide the same range of motion in the frontal plane. Methods: Twenty-nine healthy subjects aged 18–26 participated in this study. Data were collected using a three-dimensional motion analysis system and six infrared cameras. Eight markers, weighing 4.4 g and thickened 2 cm2 were used to record kinematic data. According to the normality of the data, a paired t -test was used for statistical analyses. The level of significance was set at α=0.01. Results: All motion significantly decreased when subjects used soft collars (p <0.01). According to the obtained data, flexion and lateral rotation experienced the maximum (39%) and minimum (11%) immobilization in all six motions using soft collars. Rigid collars caused maximum immobilization in flexion (59%) and minimum immobilization in the lateral rotation (18%) and limited all motion much more than the soft collar. Conclusions: This study showed that different cervical collars have different effects on neck motion. Rigid and soft cervical collars used in the present study limited the neck motion in both directions. Rigid collars contributed to significantly more immobilization in all directions.
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Sara Barati,Mohsen Mehdipour Ghazi,Behnam Khoshandam 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.1
A three-dimensional model of a HT-PEMFC was simulated using Comsol Multiphysics software. Sensitivity was analyzed by using the three-level Box-Behnken experimental design. The effect of independent variables on the fuel cell performance including air and hydrogen velocity, temperature and amount of phosphoric acid doping level (PAdop) on the membrane was investigated. The results showed that the PAdop is the most important variable. The simulation results showed that with the increasing of the PAdop from 2 to 16, the current density (at a voltage of 0.4 V) increased from 0.3 to 0.9A/cm2, which confirms the importance of the PAdop factor on the fuel cell performance.
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