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Naser Mohammadzadeh,Myong-In Lee,Ganghan Kim,Seunghee Lee 한국기상학회 2021 한국기상학회 학술대회 논문집 Vol.2021 No.10
Local air quality in one region is always affected by many factors such as local and transported sources of air pollutions. South Korea as a developed country has faced this issue. Ulsan which is located in the southeast of South Korea is a metropolitan city with a coastal line in the east and huge mountains in the west and also has lots of variations in topography, always suffer from regional and transboundary air pollutions. To analyze the aerosol characteristics over Ulsan, the optical properties of the aerosol layers in the troposphere were observed using a ground-based LIDAR (Light Detection And Ranging) located in the Ulsan National Institute of Science and Technology (UNIST), South Korea (129°E, 35°N) in March 2015-December 2020. In this study we have used two wavelengths (532 nm and 1064 nm) Depolarization channels of L2S-SM II Lidar and Range Corrected Signal (RC) seasonally and diurnally to reveal variation of air quality. The ratio of Depolarization Ratio (DR) between the 1064 nm and the 532 nm dependent on the mixing status of spherical particle and dust article. For ground observation we used 13 years air quality data. The atmospheric boundary layer height (ABLH) was mainly at an altitude of 1km. The depolarization ratio and range corrected signal was higher in spring-winter than in summer-autumn, which means that we have a huge amount of mineral dust in these times. We found that most of the high range of the depolarization ratio is almost focused on later in the morning to earlier in the night.
Naser Alkenani,S.R. Mahmoud,Ahmed M. Metwally,Afaf S. Alwabli,Habeeb M. Al-Solami 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.79 No.6
In the present paper, an analysis of elastic stability for mosquito fascicle with the elastic foundation is investigated by the variational iteration method. A mathematical model is established for the mosquito fascicle for the associated clamped and free boundary conditions. Results attained expert the stability condition of mosquito fascicle for given parameters. Design guidelines for the dynamically stable microneedle are developed and critically debated. A uniform homogeneous mosquito fascicle is considered to be restrained by labium along its length. The restraint considered in this work is an elastic foundation model by labium, and it is of great interest to bioengineering and foundation engineers. An analytical solution is not a simple procedure since the equations are highly nonlinear. This study presents the application of the variational iteration method for obtaining exact solutions for continuously restrained mosquito fascicle. The research proves that the variational iteration method is a very efficient and promising approach to understand the probing behavior of mosquitoes and the process of penetration.
Concepts and applications for integrating Unmanned Aerial Vehicles (UAV's) in disaster management
Naser, M.Z.,Kodur, V.K. Techno-Press 2020 Advances in computational design Vol.5 No.1
Over the past few decades, the impact of natural, manmade and natech (natural hazard triggering technological disasters) disasters has been devastating, affecting over 4.4 billion people. In spite of recent technological advances, the increasing frequency and intensity of natural disasters and the escalation of manmade threats is presenting a number of challenges that warrant immediate attention. This paper explores the integration of drones or Unmanned Aerial Vehicles (UAV's) into infrastructure monitoring and post-disaster assessment. Through reviewing some of the recent disasters, effectiveness of utilizing UAV's in different stages of disaster life cycle is demonstrated and needed steps for successful integration of UAV's in infrastructure monitoring, hazard mitigation and post-incident assessment applications are discussed. In addition, some of the challenges associated with implementing UAV's in disaster monitoring, together with research needs to overcome associated knowledge gaps, is presented.
Naser, Ali Fadhil,Zonglin, Wang Techno-Press 2011 Structural Engineering and Mechanics, An Int'l Jou Vol.39 No.4
Jilin highway concrete bridge is located in the center of Jilin City, which is positioned in the middle part in Jilin Province in the east north of China. This bridge crosses the Songhua River and connects the north and the south of Jilin City. The main purpose of damages inspection of the bridge components is to ensure the safety of a bridge and to identify any maintenance, repair, or strengthening which that need to be carried out. The damages that occur in reinforced concrete bridges include different types of cracks, scalling and spalling of concrete, corrosion of steel reinforcement, deformation, excessive deflection, and stain. The main objectives of this study are to inspect the appearance of Jilin highway concrete bridge and describe all the damages in the bridge structural members, and to evaluate the structural performance of the bridge structure under dead and live loads. The tests adopted in this study are: (a) the depth of concrete carbonation test, (b) compressive strength of concrete test, (c) corrosion of steel test, (d) static load test, and (e) dynamic load test. According to the damages inspection of the bridge structure appearance, most components of the bridge are in good conditions with the exception arch waves, spandrel arch, deck pavement of new arch bridge, and corbel of simply supported bridge which suffer from serious damages. Load tests results show that the deflection, strain, and cracks development satisfy the requirements of the standards.
Selective production of propylene from methanol over nanosheets of metal-substituted MFI zeolites
Naser Hadi,Reza Alizadeh,Aligholi Niaei 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.54 No.-
The nanosheets of M-substituted (M: Mn, Ce, W) MFI zeolites were successfully synthesized via hydrothermal method. The catalysts were satisfactorily characterized by different techniques and the well synthesized nanostructures were approved. The prepared catalysts were examined in methanol to propylene process and showed improved performance compared to the conventional H-ZSM-5. The Wsubstituted MFI nanosheets productively represented the best performance with complete methanol conversion, propylene selectivity of 55.70%, total selectivity to light olefins of 88.04% and catalytic lifetime of 81 h. Furthermore, TGA and BET analyses were conducted to characterize the coke deposition. The lowest coke was detected on W-substituted MFI nanosheets.