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Effects of probiotic supplementation on abdominal pain severity in pediatric patients with irritable bowel syndrome:a systematic review and meta-analysis of randomized clinical trials

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World Journal of Pediatrics 2022年第5期18卷 320-332页

作者： Somayeh Fatahi Amirhossein Hosseini Mohammad Hassan Sohouli aliakbar sayyari Katayoun Khatami Zahra Fazeli Farsani Hamzeh Amiri Naghi Dara Ivan G.O.de Souza Heitor O.Santos Pediatric Gastroenterology Hepatologyand Nutrition Research Center.Research Institute for Children's HealthShahid Beheshti University of Medical SciencesTehranIran Student Research Committee Faculty of Public Health BranchIran University of Medical Sciences.Tehran.Iran Student Research Committee.Department of Clinical Nutrition and Dietetics Faculty of Nutrition and Food TechnologyShahid Beheshti University of Medical Sciences.TehranIran School of Health Sciences.Universidade Salvador(UNIFACS) SalvadorBahia.Brazil School of Medicine Federal University of Uberlandia(UFU)UberlandiaMinas GeraisBrazil

Background Probiotic supplementation has been used to alleviate abdominal pain in children and adolescents with irritable bowel syndrome(IBS),but the evidence is not ***,a systematic review and meta-analysis of randomized clinical trials(RCTs)were performed to investigate the effects of probiotic supplementation on abdominal pain in pediatric patients with *** PubMed/MEDLINE,Web of Science,Scopus,Cochrane Library,and Embase were the available databases searched to find relevant randomized clinical trials up to April *** effect size was expressed as weighted mean differenee(WMD)and 95% confidence interval(CI).Results Seven RCTs with 441 participants were included,from which the meta-analysis demonstrated that probiotic supplementation has a significant effect on reducing abdominal pain in pediatric patients with IBS(WMD=-2.36:95%CI-4.12 to-0.60;P=0.009).Although our study involved children and adolescents(≤18 years),the effects of probiotic supplementation seem to be more potent in patients under 10 years old(WMD=-2.55;95%CI-2.84 to -2.27)compared to patients aged 10-18 years(WMD=-1.70;95%CI-2.18 to -1.22).The length of supplementation longer than four weeks was more effective(WMD=-2.43;95%CI-2.76 to -2.09).Conclusion Probiotic supplementation can reduce abdominal pain in pediatric patients with IBS.

关键词： Abdominal pain Adolescents-Irritable bowel syndrome Meta-analysis Probiotic

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3D-Printed MOF Monoliths:Fabrication Strategies and Environmental Applications

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Nano-Micro Letters 2024年第12期16卷 358-405页

作者： Hossein Molavi Kamyar Mirzaei Mahdi Barjasteh Seyed Yahya Rahnamaee Somayeh Saeedi aliakbar Hassanpouryouzband Mashallah Rezakazemi Department of Chemistry Institute for Advanced Studies in Basic Science(IASBS)Zanjan 45137-66731Iran Department of Chemical and Biological Engineering University at BuffaloThe State University of New YorkBuffaloNY 14260USA Center for Nano-Science and Nanotechnology Institute for Convergence Science&TechnologySharif University of TechnologyTehran 15614Iran Department of Biomedical Engineering Amirkabir University of Technology(Tehran Polytechnic)Hafez Ave.P.O.Box 15875-4413TehranIran Grant Institute School of GeosciencesUniversity of EdinburghWest Main RoadEdinburgh EH93FEUK Faculty of Chemical and Materials Engineering Shahrood University of TechnologyShahroodP.O.Box ***Iran

Metal-organic frameworks(MOFs)have been extensively considered as one of the most promising types of porous and crystalline organic-inorganic materials,thanks to their large specific surface area,high porosity,tailorable structures and compositions,diverse functionalities,and well-controlled pore/size ***,most developed MOFs are in powder forms,which still have some technical challenges,including abrasion,dustiness,low packing densities,clogging,mass/heat transfer limitation,environmental pollution,and mechanical instability during the packing process,that restrict their applicability in industrial ***,in recent years,attention has focused on techniques to convert MOF powders into macroscopic materials like beads,membranes,monoliths,gel/sponges,and nanofibers to overcome these ***-dimensional(3D)printing technology has achieved much interest because it can produce many high-resolution macroscopic frameworks with complex shapes and geometries from digital ***,this review summarizes the combination of different 3D printing strategies with MOFs and MOF-based materials for fabricating 3D-printed MOF monoliths and their environmental applications,emphasizing water treatment and gas adsorption/separation ***,the various strategies for the fabrication of 3D-printed MOF monoliths,such as direct ink writing,seed-assisted in-situ growth,coordination replication from solid precursors,matrix incorporation,selective laser sintering,and digital light processing,are described with the relevant ***,future directions and challenges of 3D-printed MOF monoliths are also presented to better plan future trajectories in the shaping of MOF materials with improved control over the structure,composition,and textural properties of 3D-printed MOF monoliths.

关键词： MOFs 3D-printing Environmental remediation Shaping Monoliths

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Effect of alumina and silica nanocomposite based on polyacrylamide on light and heavy oil recovery in presence of formation water using micromodel

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Petroleum 2024年第2期10卷 338-353页

作者： Ashkan Maleki Behnam Sedaee Alireza Bahramian Sajjad Gharechelou Nahid Sarlak Arash Mehdizad Mohammad reza Rasaei aliakbar Dehghan Science and Research Branch Islamic Azad UniversityIran Institute of Petroleum Engineering School of Chemical EngineeringUniversity of TehranIran School of Geology College of ScienceUniversity of TehranIran Department of Chemistry Lorestan University Iran Iranian Offshore Oil Company Iran

Increasing world request for energy has made oil extraction from reservoirs more *** novel EOR methods have been proposed and utilized for this *** nanocomposites in chemical flooding is one of these novel *** this study,we investigated the impact of six injection solutions on the recovery of light and heavy oil with the presence of two different brines as formation water using a homogenous glass *** of the injection solutions were based on a 40,000 ppm Na Cl synthetic seawater(SSW),one of which was additive free and the others were prepared by dispersing nanocomposite silica-based polyacrylamide(NCSP),nanocomposite alumina-based polyacrylamide(NCAP),the combination of both nanocomposites silica and alumina based on polyacrylamide(NCSAP),surfactant(CTAB)and polyacrylamide(PAM)with a concentration of 1000 ppm as *** Stability of nanocomposites was tested against the salinity of the brine and temperature using salinity and DSC tests which were *** stability tests,IFT,contact angle and oil recovery measurements were *** results revealed that in addition to the effect of silica and alumina nanocomposite in reducing interfacial tension and wettability alteration,control of mobility ratio caused a major improvement in sweeping efficiency and oil *** to the sweeping behavior of injected fluids,it was found that the main effect of surfactant was wettability alteration,for polyacrylamide was mobility control and for nanocomposites was the reduction of interfacial tension between oil and injected fluid,which was completely analyzed and checked ***,NCSAP with 95.83%and 70.33%and CTAB with 84.35%and 91%have the highest light oil recoveries at 250,000 ppm and 180,000 ppm salinity,respectively which is related to the superposition effect of interactions between nanocomposites,solution and *** on our results it can be concluded that the most effective mechanism in oil recovery was I

关键词： Enhanced oil recovery Micromodel Polyacrylamide Nanocomposite Salinity Alumina and silica nanoparticles

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A machine learning-guided design and manufacturing of wearable nanofibrous acoustic energy harvesters

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Nano Research 2024年第10期17卷 9181-9192页

作者： Negar Hosseinzadeh Kouchehbaghi Maryam Yousefzadeh aliakbar Gharehaghaji Safoora Khosravi Danial Khorsandi Reihaneh Haghniaz Ke Cao Mehmet R.Dokmeci Mohammad Rostami Ali Khademhosseini Yangzhi Zhu Terasaki Institute for Biomedical Innovation Los AngelesCA 91367USA Department of Textile Engineering Amirkabir University of Technology(Tehran Polytechnic)Hafez Avenue*** TehranIran Department of Electrical and Computer Engineering University of British ColumbiaVancouverBC V6T1Z4Canada Chemical Sciences Division Oak Ridge National LaboratoryOak RidgeTN 37831USA Department of Computer Science University of Southern CaliforniaLos AngelesCA 90007USA

Nanofibrous acoustic energy harvesters(NAEHs)have emerged as promising wearable platforms for efficient noise-to-electricity conversion in distributed power energy systems and wearable sound amplifiers for assistive listening ***,their reallife efficacy is hampered by low power output,particularly in the low-frequency range(<1 kHz).This study introduces a novel approach to enhance the performance of NAEHs by applying machine learning(ML)techniques to guide the synthesis of electrospun polyvinylidene fluoride(PVDF)/polyurethane(PU)nanofibers,optimizing their application in wearable *** use a feed-forward neural network along with solving an optimization problem to find the optimal input values of the electrospinning(applied voltage,nozzle-collector distance,electrospinning time,and drum rotation speed)to generate maximum output performance(acoustic-to-electricity conversion efficiency).We first prepared a dataset to train the network to predict the output power given the input variables with high *** introducing the neural network,we fix the network and then solve an optimization problem using a genetic algorithm to search for the input values that lead to the maximum energy harvesting *** ML-guided wearable PVDF/PU NAEH platform can deliver a maximal acoustoelectric power density output of 829μW/cm^(3) within the surrounding noise *** addition,our system can function stably in a broad frequency(0.1-2 kHz)with a high energy conversion efficiency of 66%.Sound recognition analysis reveals a robust correlation exceeding 0.85 among lexically akin terms with varying sound intensities,contrasting with a diminished correlation below 0.27 for words with disparate semantic ***,this work provides a previously unexplored route to utilize ML in advancing wearable NAEHs with excellent practicability.

关键词： wearable electronics acoustic energy harvester machine learning piezoelectric nanogenerator electrospun nanofiber

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Microstructure and magnetostrictive behavior of Fe-15 at% Ga alloy with different cooling rates

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Rare Metals 2015年第4期34卷 251-254页

作者： aliakbar Emdadi Faculty of Materials Engineering Center for Advanced Materials Research Sahand University of Technology

The main attention of this paper was devoted to the study of the effect of different cooling rates on the magnetic domain configuration and magnetostrictive behavior of heat-treated Fe-15 at% Ga alloy. After annealing at 1,000℃ for 3 h, the samples were subjected to water quenching, air cooling, and furnace cooling treatments. Phase constitution and magnetic domain structures of the samples were studied using X-ray diffraction （XRD） and magnetic force microscopy （MFM）. XRD results indicate a single phase of α-Fe with disordered bcc （A2） structure for all samples. MFM results show that both water-quenched （WQ） and air-cooled （AC） samples are mainly made from ordered stripe domain structures, whereas a mixture of irregular stripe, zigzag, and plate domain patterns are observed in furnace-cooled （FC） sample. Magnetostrictive strain was measured in the presence of an extemally applied magnetic field. It is found that WQ sample has the highest magnetostriction, while AC and FC samples exhibit moderate and the lowest magnetostriction, respectively, against the applied field. The dependence of initial domain configurations on thermal history is found to be conducive to the change in saturation magnetostrictions of the samples.

关键词： Fe-Ga alloy Magnetostrictive behavior Micro-stress X-ray diffraction Magnetic domain structure

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Microstructure of polycrystalline Fe_(82)Ga_(18) sample with solidification texture

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Rare Metals 2016年第9期35卷 686-690页

作者： aliakbar Emdadi Center for Advanced Materials Research Faculty of Materials EngineeringSahand University of Technology

Main attention of this paper was devoted to studying the effect of solidification texture on microstructure（phase constituents,grain morphology,and magnetic domain structure） of polycrystalline Fe_（82）Ga_（18） *** alloy was melted using button arc melting and solidified in water-cooled copper *** microscope（OM） results confirm the development of large columnar grains in the solidification *** constitution and magnetic domain structures of the sample were studied by X-ray diffraction（XRD） and magnetic force microscopy（MFM）.Results show a single-phase solid solution with an A2 structure for the sample which consists of regularly aligned magnetic *** some maze-like subdomains are found in few regions,well-aligned stripe-like domains are predominant patterns in the *** demonstrates the high dependence of grain morphology and magnetic domain structure upon a preferred crystallographic direction during solidification.

关键词： Galfenol Solidification texture Grain morphology Magnetic domain structure

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Control strategy of hybrid fuel cell/battery distributed generation system for grid-connected operation

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第4期10卷 488-496页

作者： Masoud aliakbar GOLKAR Amin HAJIZADEH Department of Electrical Engineering K.N.Toosi University of TechnologyTehran Iran

This paper presents a control strategy of a hybrid fuel cell/battery distributed generation (HDG) system in distribution systems. The overall structure of the HDG system is given, dynamic models for the solid oxide fuel cell (SOFC) power plant, battery bank and its power electronic interfacing are briefly described, and controller design methodologies for the power conditioning units and fuel cell to control the power flow from the hybrid power plant to the utility grid are presented. To distribute the power between the fuel cell power plant and the battery energy storage, a neuro-fuzzy controller has been developed. Also, for controlling the active and reactive power independently in distribution systems, the current control strategy based on two fuzzy logic controllers has been presented. A Matlab/Simulink simulation model is developed for the HDG system by combining the individual component models and their controllers. Simulation results show the overall system performance including load-following and power management of the HDG system.

关键词： Battery Fuel cell Hybrid distributed generation Intelligent control Power control

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Development of seismic fragility curves for precast concrete frames with cast-in-situ concrete shear-walls

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Earthquake Engineering and Engineering Vibration 2022年第1期21卷 149-167页

作者： aliakbar Yahyaabadi Roozbeh Talebkhah Mahdi Adibi Faculty of Engineering University of BojnordBojnord 94531-55111Iran

Precast reinforced concrete buildings have been well received in some seismic zones worldwide due to advantages such as the ease and the speed of implementation,and the possibility of working in inappropriate atmospheric *** this research,seismic fragility curves were developed for precast concrete frames with a cast-in-situ concrete shear-wall,concerning the important issues of modeling the precast beam-column joints,construction quality,and soil type *** this purpose,the incremental dynamic analysis(IDA)was conducted for three-dimensional models of 3-,5-,and 8-story buildings under two record sets corresponding to soil types C and D of the NEHRP ***-column joints were modeled using nonlinear rotational springs with rigid links with respect to the finite size of the joint *** demonstrate that the Weibull distribution can be fitted to the damage state capacities better than the lognormal distribution at the intensities that are more than one standard deviation away from the median damage *** seismic vulnerability of precast structures increases at all damage states as the height of the building *** is also observed that soil type has almost no considerable effect on the fragility curve parameters for all damage states considered herein.

关键词： fragility curve incremental dynamic analysis precast beam-column joints construction quality soil type effects

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A Hybrid Particle Swarm Optimization and Genetic Algorithm for Model Updating of A Pier-Type Structure Using Experimental Modal Analysis

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China Ocean Engineering 2020年第5期34卷 697-707页

作者： Alireza MOJTAHEDI Shahriar BAYBORDI Amin FATHI aliakbar YAGHUBZADEHb Department of Water Resources Engineering Faculty of Civil EngineeringUniversity of TabrizTabriz 51666-16471Iran Department of Maritime Engineering Amirkabir University of TechnologyTehranIran

Conventional design of pier structures is based on the assumption of fully rigid joints. In practice, the real connections are semi-rigid that cause changes in dynamic characteristics. In this study, quality of the joints is investigated by considering changes in natural frequencies. For this purpose, numerical and experimental modal analyses are carried out on related physical model of a pier type structure. When numerical results are evaluated,natural frequencies generally do not match the expected experimental results. Uncertainties in different aspects of engineering problems are always a challenge for researchers. The numerical models which are constructed on the basis of highly idealized scheme may not be able to represent all of the physical aspects of the physical one. For this study, determination of percentage of semi-rigid joints is considered as an optimization problem based on the numerical and experimental frequencies. Probabilistic sensitivity analysis is also used to determine the search space.A new technique of optimization problem is solved by a combination of smart particle swarm optimization(PSO)and genetic algorithms, and a complicated and efficient system for model updating process is introduced. It is observed that the hybrid PSO-Genetic algorithm is applicable and appropriate in model updating process. It performs better than PSO algorithm, considering the good agreement between theoretical frequencies and experimental ones,before and after model updating.

关键词： pier structure probabilistic sensitivity analysis hybrid PSO-Genetic algorithm dynamic characteristics

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Improving energy storage by PCM using hybrid nanofluid[(SWCNTs-CuO)/H_(2)O]and a helical(spiral)coil:Hybrid passive techniques

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Theoretical & Applied Mechanics Letters 2023年第4期13卷 299-310页

作者： aliakbar Hosseinpour Mohsen Pourfallah Mosayeb Gholinia Department of Mechanical Engineering Babol Noshirvani University of TechnologyBabolIran Department of Mechanical Engineering Mazandaran University of Science and TechnologyBabolIran CNR-ITAE–Institute of Advanced Energy Technologies“Nicola Giordano” MessinaItaly

The aim of this study is the numerical analysis of the melting process of the phase change material(PCM)in a spiral *** space between the inner tube and outer shell is filled with RT-50 as ***,the hybrid nanofluid(with a carbon component)flows through the inner *** novelty of this work is to use different configurations of fin and different percentage of hybrid nanoparticles(SWCNTs-Cu O)on the PCM melting *** the numerical model created by ANSYS-Fluent,the effect of various inlet temperatures is *** results indicate that the extended surface created by extra fin has a dominant effect on melting time,so by adding the third fin,the melting time is reduced by 39.24%.The next most influential factor in PCM melting is the inlet temperature of the working fluid,so that 10°C increment of temperature result in the PCM melting time decreased by 35.41%.

关键词： PCM melting Helical coli Thermal energy storage CFD analysis

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