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Does country risk impact the banking sectors’non‑performing loans?Evidence from BRICS emerging economies

Financial Innovation 2023年第1期9卷 2477-2506页

作者： Chafic Saliba Panteha Farmanesh seyed alireza athari Department of Business Girne American UniversityKyreniaNorthern CyprusTurkey Department of Business Administration Faculty of Economics and Administrative SciencesCyprus International UniversityNicosiaNorthern CyprusTurkey Department of Business Holy Spirit University of KaslikKaslikLebanon

This study aims to fill the gap in the literature by specifically investigating the impact of country risk on the credit risk of the banking sectors operating in Brazil,Russia,India,China,and South Africa(BRICS),emerging *** specifically,we explore whether the country-specific risks,namely financial,economic,and political risks significantly impact the BRICS banking sectors’non-performing loans and also probe which risk has the most outstanding effect on credit *** do so,we perform panel data analysis using the quantile estimation approach covering the period 2004–*** empirical results reveal that the country risk significantly leads to increasing the banking sector’s credit risk and this effect is prominent in the banking sector of countries with a higher degree of non-performing loans(Q.25=−0.105,Q.50=−0.131,Q.75=−0.153,Q.95=−0.175).Furthermore,the results underscore that an emerging country’s political,economic,and financial instabilities are strongly associated with increasing the banking sector’s credit risk and a rise in political risk in particular has the most positive prominent impact on the banking sector of countries with a higher degree of non-performing loans(Q.25=−0.122,Q.50=−0.141,Q.75=−0.163,Q.95=−0.172).Moreover,the results suggest that,in addition to the banking sectorspecific determinants,credit risk is significantly impacted by the financial market development,lending interest rate,and global *** results are robust and have significant policy suggestions for many policymakers,bank executives,researchers,and analysts.

关键词： Credit risk Country risk BRICS Emerging markets Banking sector Political risk Quantile regression

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New insights on the role of chondroitin sulfate proteoglycans in neural stem cell–mediated repair in spinal cord injury

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Neural Regeneration Research 2025年第6期20卷 1699-1700页

作者： seyed Mojtaba Hosseini Soheila Karimi-Abdolrezaee Department of Physiology and Pathophysiology Spinal Cord Research CentreRady Faculty of Health SciencesUniversity of ManitobaWinnipegMBCanada Manitoba Multiple Sclerosis Research Center WinnipegMBCanada Children Hospital Research Institute of Manitoba WinnipegMBCanada

Extensive neurodegeneration is a hallmark of traumatic spinal cord injury (SCI) that underlies permanent sensorimotor and autonomic impairments (Alizadeh et al.,2019).Following the primary impact,the spinal cord undergoes a cascade of secondary injury mechanisms that are driven by disruption of the blood-spinal cord ba rrier,vascula r inju ry,glial reactivity,neu roinfla mmation,oxidative stress,lipid peroxidation,and glutamate excitotoxicity that culminate in neuronal and oligodendroglial cell death,demyelination,and axonal damage(Alizadeh et al.,2019).To achieve a meaningful functional recovery after SCI,regeneration of new neurons and oligodendrocytes and their successful growth and integration within the neural network are critical steps for reconstructing the damaged spinal cord tissue (Fischer et al.,2020).

关键词： peroxidation Fischer injury

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Effects of Magnetic Particles Entrance Arrangements on Mixing Efficiency of a Magnetic Bead Micromixer

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Nano-Micro Letters 2014年第1期6卷 30-37页

作者： Reza Kamali seyed alireza Shekoohi alireza Binesh School of Mechanical Engineering Shiraz University

In this study, a computer code is developed to numerically investigate a magnetic bead micromixer under different conditions. The micromixer consists of a microchannel and numerous micro magnetic particles which enter the micromixer by fluid flows and are actuated by an alternating magnetic field normal to the main flow. An important feature of micromixer which is not considered before by researchers is the particle entrance arrangement into the micromixer. This parameter could effectively affect the micromixer efficiency. There are two general micro magnetic particle entrance arrangements in magnetic bead micromixers: determined position entrance and random position entrance. In the case of determined position entrances, micro magnetic particles enter the micromixer at specific positions of entrance cross section. However, in a random position entrance,particles enter the microchannel with no order. In this study mixing efficiencies of identical magnetic bead micromixers which only differ in particle entrance arrangement are numerically investigated and *** results reported in this paper illustrate that the prepared computer code can be one of the most powerful and beneficial tools for the magnetic bead micromixer performance analysis. In addition, the results show that some features of the magnetic bead micromixer are strongly affected by the entrance arrangement of the particles.

关键词： Magnetic bead micromixer Mixing efficiency Particle entrance arrangement

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Successful interferon desensitization in a patient with chronic hepatitis C infection

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World Journal of Gastroenterology 2009年第33期15卷 4196-4198页

作者： seyed alireza Taghavi Ahad Eshraghian Gastroentero-hepatology Research Center of Shiraz University of Medical Science Nemazee Hospital

Treatment of hepatitis C, even when absolutely necessary, is almost impossible when interferon cannot be administered for any reason. We report a 65-year-old patient with chronic hepatitis C virus (HCV) infection and fibrosis, who was unable to receive interferon because of systemic hypersensitivity. The patient was desensitized successfully through gradual incremental exposure to interferon, and HCV infection was eradicated after a complete course of treatment, with no further allergic reactions. This case report that describes successful eradication of hepatitis C in a patient with advanced liver disease after desensitization to interferon revealed that desensitization may not necessarily damage the therapeutic efficacy of the drug.

关键词： Chronic hepatitis C Desensitization Drug hypersensitivity Interferon a2b Ribavirin

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Efficient Resource Allocation with Improved Interference Mitigation in FFR-Aided OFDMA Heterogeneous Networks

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Journal of Electronic Science and Technology 2019年第1期17卷 73-89页

作者： Sani Umar Abdullahi Jian Liu seyed alireza Mohadeskasaei the School of Computer and Communication Engineering University of Science and Technology Beijing

Fractional frequency reuse(FFR) has recently emerged as an efficient inter-cell interference coordination technique for orthogonal frequency division multiple access(OFDMA) based multi-tier cellular networks due to its low complexity, minimal signaling over-head, and coverage improvement. In this work, an intermediary region(IR) at the border of the center region(CR) and edge region(ER) is defined, which prevents severe cross-tier interference and is usually ignored by other schemes. Furthermore, a strategic resource allocation scheme is proposed, which allows macro users in this new region to be served more resources due to their good channel conditions close to the serving base station(BS), while femto users are assigned resource blocks from sub-bands that receive the least net interference from a set of usable sub-bands in any region. We find by analysis and simulation the optimal threshold for IR, which minimizes the cross-tier interference, and show that the femto throughput is also maximized for this threshold. Numerical results show the proposed scheme outperforms other notable schemes in terms of throughput and outage performances.

关键词： Femto cells fractional frequency reuse(FFR) heterogeneous network interference management macro cells resource allocation

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Two-phase SPH modelling of waves caused by dam break over a movable bed

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International Journal of Sediment Research 2014年第3期29卷 344-356页

作者： seyedeh Leila RAZAVITOOSI seyed Ali AYYOUBZADEH alireza VALIZADEII Water Structures Engineering Department Tarbiat Modares UniversityJalal Ale Ahmad HighwayTehranIran Monash University Wellington RdClaytonVIC 3800Australia

This paper describes the application of the Smoothed Particle Hydrodynamics(SPH) method for modeling two dimensional waves caused by dam break over a movable bed in two *** two phase SPH method is developed to solve the Navier-Stokes *** fluid and sediment phases are described by particles as weakly compressible fluids and the incompressibility is achieved by the equation of *** sediment phase is modeled as a non-Newtonian fluid using three alternative approaches of artificial viscosity and Bingham *** this paper,the new formulations for two-phase flows are *** numerical results obtained from the developed SPH model show acceptable accuracy with comparison to experimental data.

关键词： Dam break Sediment Smoothed Particle Hydrodynamics(SPH)

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Pyrolysis and combustion kinetics of lycopodium particles in thermogravimetric analysis

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Journal of Central South University 2015年第9期22卷 3409-3417页

作者： seyed alireza Mostafavi Sadjad Salavati Hossein Beidaghy Dizaji Mehdi Bidabadi Department of Mechanical Engineering Faculty of Engineering Arak University School of Mechanical Engineering Department of Energy Conversion Combustion Research Laboratory Iran University of Science and Technology

Biomass is a kind of renewable energy which is used increasingly in different types of combustion systems or in the production of fuels like bio-oil. Lycopodium is a cellulosic particle, with good combustion properties, of which microscopic images show that these particles have spherical shapes with identical diameters of 31 μm. The measured density of these particles is 1.0779 g/cm2. Lycopodium particles contain 64.06% carbon, 25.56% oxygen, 8.55% hydrogen and 1.83% nitrogen, and no sulfur. Thermogravimetric analysis in the nitrogen environment indicates that the maximum of particle mass reduction occurs in the temperature range of 250-550 ℃ where the maximum mass reduction in the DTG diagrams also occurs in. In the oxygen environment, an additional peak can also be observed in the temperature range of 500-600 ℃, which points to solid phase combustion and ignition temperature of lycopodium particles. The kinetics of reactions is determined by curve fitting and minimization of error.

关键词： lycopodium dust particles thermogravimetric analysis pyrolysis combustion ignition temperature chemical kinetics

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Concrete strength and durability prediction through deep learning and artificial neural networks

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Frontiers of Structural and Civil Engineering 2024年第10期18卷 1540-1555页

作者： Maedeh HOSSEINZADEH Hojjat SAMADVAND alireza HOSSEINZADEH seyed Sina MOUSAVI Mehdi DEHESTANI Faculty of Civil Engineering Babol Noshirvani University of TechnologyBabol 47148-71167Iran Department of Civil Engineering Urmia UniversityUrmia 57561-51818Iran

The mechanical and durability characteristics of concrete are crucial for designing and evaluating concrete structures throughout their entire operational *** main objective of this research is to use the deep learning(DL)method along with an artificial neural network(ANN)to predict the chloride migration coefficient and concrete compressive *** expansive experimental database of nearly 1100 data points was gathered from existing scientific *** forecast models were created,utilizing between 10 and 12 input *** ANN was used to address the missing data gaps in the literature.A comprehensive pre-processing approach was then implemented to identify outliers and encode data *** use of mean absolute error(MAE)as an evaluation metric for regression tasks and the employment of a confusion matrix for classification tasks were found to produce accurate ***,both the compressive strength and chloride migration coefficient exhibit a high level of accuracy,above 0.85,in both regression and classification ***,a user-friendly web application was successfully developed in the present study using the Python programming language,improving the ability to integrate smoothly with the user’s device.

关键词： chloride migration coefficient compressive strength concrete artificial neural network deep learning

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Sediment contribution from different geologic formations and land uses in an Iranian small watershed,case study

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International Journal of Sediment Research 2017年第2期32卷 210-220页

作者： seyed Hamidreza Sadeghi Saeed Najafi alireza Riyahi Bakhtiari Department of Watershed Management Engineering Faculty of Natural ResourcesTarbiat Modares University Department of Environmental Sciences Faculty of Natural ResourceTarbiat Modares University

Many intra and extra problems occurred due to unsustainable human use of natural resources leading to increasing sediment loads in the ***,few studies have been comprehensively conducted in progressing countries to prioritize sediment sources from different points of views,particularly in some countries like Iran where such valuable information is essential for proper watershed resources *** present study was therefore planned to assess the importance of potential sediment sources viz.,spatial sources(geologic units) and source types(land use units) in sediment yield in Idelo watershed as one of the important sub-watersheds of Sefidrood large Watershed in Zanjan Province,Iran,using composite *** addition,the results of the sediment fingerprinting approach were compared with those of field measurement data obtained from studying soil erosion types(viz.,sheet,rill and gully erosion).Toward this attempt,16 tracers were detected in different geologic units and land uses and the sediment yielded at the watershed *** results showed that the composite fingerprints of the different geologic units comprising As,N,Cu,Zn,OC and Co tracers could correctly distinguish 86% of the sediment source *** red gypsiferous marl contributed 85 percent in sediment *** regard to source types,the optimum composite fingerprint encompassed only N and Cu and provided a discriminatory efficiency of 90%.Besides that,the rangelands with 48.8% study area coverage had a significant contribution of 88% in sediment *** field measurements confirmed the reliability of results of fingerprinting approach in apportioning watershed scale sediment sources on the base of consistency of the two sets of *** was also understood from the results,besides successful applicability of composite fingerprinting in assessing the provenance of the sediment yielded at the watershed outlet that the geologic formations and land use types played differe

关键词： Composite fingerprinting Multivariate mixing model Soil erosion Spatial sources Source types

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Presentation of regression analysis,GP and GMDH models to predict the pedestrian density in various urban facilities

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Frontiers of Structural and Civil Engineering 2022年第2期16卷 250-265页

作者： Iraj BARGEGOL seyed Mohsen HOSSEINIAN Vahid NAJAFI MOGHADDAM GILANI Mohammad NIKOOKAR alireza OROUEI School of Civil Engineering University of GuilanRasht41996-13776Iran School of Civil Engineering Iran University of Science and Technology(IUST)Tehran13114-16846Iran School of Civil Engineering Islamic Azad UniversitySemnan35131-37111Iran

In this study,the relationship between space mean speed(SMS),flow rate and density of pedestrians was investigated in different pedestrian facilities,including 1 walkway,2 sidewalks,2 signalized crosswalks and 2 mid-block ***,statistical analysis was performed to investigate the normality of data and correlation of *** analysis was then applied to determine the relationship between SMS,flow rate,and density of ***,two prediction models of density were obtained using genetic programming(GP)and group method of data handling(GMDH)models,and k-fold and holdout cross-validation methods were used to evaluate the *** the use of regression analysis,the mathematical relationships between variables in all facilities were calculated and plotted,and the best relationships were observed in flow rate-density *** also indicated that GP had a higher R2 than GMDH in the prediction of pedestrian density in terms of flow rate and SMS,suggesting that GP was better able to model SMS and pedestrian ***,the application of k-fold cross-validation method in the models led to better performances compared to the holdout cross-validation method,which shows that the prediction models using k-fold were more ***,density relationships in all facilities were obtained in terms of SMS and flow rate.

关键词： pedestrian density regression analysis GP model GMDH model

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