Effects of B-Site Donor Modification on the Crystal Structure and the Electrical Properties of Lead-Free 0.65BiFeO3-0.35BaTiO3 Ceramics

salman,파잘 아카람,김준찬,송태권,김명호,이순일,Rizwan Ahmed Malik,Ali Hussain,김원정,성연수 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.75 No.10

In the present work, lead-free piezoelectric ceramics 0.65Bi1.05Fe1−xTixO3-0.35BaTi1−yNbyO3, where x = y = 0, 0.01, 0.015, 0.02, and 0.025, abbreviated as BFT-BTNb, were successfully synthesized by a solid-state reaction method and an air quenching method. The effects of B-Site donor modifications (Nb5+ and Ti4+) on the crystal structure, the morphology and the electrical properties of the 0.65BF-0.35BT ceramics were studied. X-ray diffraction patterns showed the formation of a pure perovskite structure, without any secondary phases. Scanning electron microscope (SEM) micrographs revealed that the average grain size of the BF-BT ceramics decreased with the addition of B-Site donors. Improvements in the ferroelectric properties (P-E loops) and the electric fieldinduced strain properties (S-E loops) were obtained at the optimum composition of the BFT-BTN ceramics. In addition, the dynamic piezoelectric coefficient (d ∗ 33) was enhanced from 265 pm/V for (BFT-BTNb-0) to 360 pm/V for (BFT-BTNb-1) with high working temperature, Tm = 320 ◦ C.

RETRACTED ARTICLE: Droop Control based Approach for Frequency and Voltage in Hybrid AC/DC Microgrid

Salman Salman,Xin Ai 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.5

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A framework of examining the factors affecting public acceptance of nuclear power plant: Case study in Saudi Arabia

Alzahrani Salman M.,Alwafi Anas M.,Alshehri Salman M. 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.3

The Saudi National Atomic Energy project aims to adopt peaceful nuclear technologies and be part of the country's energy mix. As emerging nuclear energy, it is essential to understand public concerns and acceptability of nuclear energy, as well as the factors influencing acceptance to develop nuclear energy policy and implement nuclear energy programs. The purpose of this study is to analyze the public attitudes and acceptance of nuclear energy among Saudi Arabian citizens by utilizing protection motivation theory and theory of planned behavior. A total of 1,404 participants answered a questionnaire which was distribute by convenience sampling approach. A Structural Equation Modeling framework was constructed and analyzed to understand public behavior toward building the country's first Nuclear Power Plant (NPP). Before analyzing the data, the model was validated. The research concluded that the benefits of nuclear power plants were essential in determining people's acceptance of NPPs. Surprisingly, the effect of the perceived benefits was found higher than the effect of the perceived risks to the acceptance. Furthermore, the public's participation in this study revealed that the NPPs location has a significant impact on their acceptance. Based on the finding, several policy implementations were suggested. Finally, the study's model results would benefit scholars, government agencies, and the business sector in Saudi Arabia and worldwide.

Grouping effect on the seismic response of cabinet facility considering primary-secondary structure interaction

Salman, Kashif,Tran, Thanh-Tuan,Kim, Dookie Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.6

Structural modification in the electrical cabinet is investigated by a proposed procedure that comprises of an experimental, analytical and numerical solution. This research emphasizes the linear dynamic analysis of the cabinet that is studied under the seismic excitation to demonstrate the real behavior of the cabinets in NPP. To this end, an actual electric cabinet is experimentally tested using an impact hammer test which reveals the fundamental parameters of the cabinet. The Frequency-domain decomposition (FDD) method is used to extract the dynamic properties of the cabinet from the experiment which is then used for numerical modeling. To validate the dynamic properties of the cabinet an analytical solution is suggested. The calibrated model is analyzed under the floor response obtained from the Connecticut nuclear power plant structure excited by Tabas 1978 (Mw 7.4) earthquake. Eventually, the grouping effect of the cabinets is proposed which represents the influence on the dynamic modification. This grouping of the cabinets is described more sophisticatedly by the theoretical understating, which results in a significant change in the seismic response. Considering the grouping effects will be helpful in the assessment of the real seismic behavior, design, and performance of cabinets.

The Big Bang

( Salman Noshear Arshad ) 대한금속재료학회 ( 구 대한금속학회 ) 2003 재료마당 Vol.16 No.5

Influence of carbon/nitrogen ratio and non-aerated zone size on performance and energy efficiency of a partially-aerated submerged fixed-film bioreactor

Salman Alizadeh Kordkandi,Ali Baradar Khoshfetrat 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.31 No.-

Performance and energy efficiency of an upflow partially aerated submerged fixed-film (UP/ASFF)bioreactor was evaluated during a 10-month operation period. Increasing loading rates at constant HRTand COD/N increased nitrogen removals. Increase of non-aerated zone could also improve the nitrogenremovals up to 83%. Energy performance coefficient based on required electrical energy showed that theenergy efficiency of the system increases at lower COD/N value and bigger non-aerated zone forsimultaneous COD and nitrogen removal from the synthetic wastewater. The present study showed alsosimilar performance for municipal wastewater, demonstrating the potential of UP/ASFF system to treathigh-ammonium municipal wastewaters.

Performance modelling of a partially-aerated submerged fixed-film bioreactor: Mechanistic analysis versus semi data-driven method

Salman Alizadeh Kordkandi,Ali Baradar Khoshfetrat,Asaad Faramarzi 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.61 No.-

A novel semi-mechanistic data-driven technique based on an evolutionary polynomial regression (EPR) was developed along with a kinetic analysis to evaluate the performance of an external loop upflow partially-aerated fixed-film bioreactor (UP/ASFF). Modelling of experimental data was carried out under different organic loading rates (OLR), solid retention time (SRT), and food to microorganisms’ ratio (F/M ratio). The results showed that the EPR model was the best approach for the performance evaluation of the UP/ASFF system with R2 of 0.93 and normalized MSE of 0.02 although the Stover-Kincannon’s model showed also a promising predication with high accuracy and R2 of 0.92.

Effect of the Copolymerized Aromatic and Unsaturated Monomers on the Affinity of Drug-Polyesters in the Core-Shell Nanoparticles

Salman Hassanzadeh,Sepideh Khoee,Loghman Firoozpour 한국고분자학회 2013 Macromolecular Research Vol.21 No.1

The objective of this study was to get an insight into the influence of the newly provided functional groups from the copolymerization as a strategy on the total interactions of the hydrophobic drug and the polyesteric core of the prepared core-shell nanoparticles. Three amphiphile triblock models of monomethoxy poly(ethylene gycol)(mPEG)-b-polyester-b-mPEG with the same PEG hydrophile part but different hydrophobe polyesteric segments were synthesized and used for preparation of the core-shell nanoparticles that were loaded by quercetin as a model hydrophobe drug in the core. The total amount of the interaction between polyesters in the core and loaded quercetin were monitored by parameters such as drug loadings, in vitro release rates and other newly defined parameters such as micelle encapsulation efficiency. The results highlighted that changing the structure of the saturated aliphatic polyesteric core in the poly(butylene adipate) with diol monomers that are capable of forming additional π stacking and π -OH interactions with quercetin weakens the optimal conditions for the main drug-esteric hydrogen bonding. Therefore, the decreased total affinity of the quercetin and polyesteric core finally resulted in the lower amount of encapsulated drug and the increased release rate.

LPV Modeling and Tracking Control of Dissimilar Redundant Actuation System for Civil Aircraft

Salman Ijaz,Mirza Tariq Hamayun,Haris Anwaar,Lin Yan,Ming Kuo Li 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.3

Dissimilar redundant actuation systems (DRAS) are in practice in advanced aircraft in order to increasereliability and to resolve the actuator failure issue due to common cause. This paper addresses the problem offorce fighting that occurs due to dynamics mismatch of two dissimilar actuators in DRAS and provides a method toachieve precise tracking of aircraft control surface. The nonlinear system dynamics are first transformed into linearparameter varying (LPV) form using recursive least square (RLS) method. The LPV observer based controller isthen designed to synchronize the positions of dissimilar actuators in DRAS and to drive the control surface smoothly. By applying linear matrix inequalities (LMIs), parameter dependent Lyapunov function (PDLF) is obtained toachieve global stability and to compute the controller and observer gains. To test controller according to realflight condition, an external disturbance signal that acts as air load is applied at the control surface input. Severalsimulations on the nonlinear system validate the dominant performance of proposed controller as compared to theexisting methods in literature.

Public awareness and practices towards health impacts of PM<SUB>2.5</SUB> in the Kingdom of Bahrain: identifying areas for intervention

Salman Alzayani,Maha Alsabbagh 환경독성보건학회 2022 환경독성보건학회지 Vol.37 No.2

Air quality has critical public health impacts as several diseases have been attributed to exposure to high PM<SUB>2.5</SUB> concentrations. In the Kingdom of Bahrain context, while the sources of PM<SUB>2.5</SUB> and prevailing trends have been studied, its social and health dimensions remain a gap in the literature. This study explores public perceptions of PM<SUB>2.5</SUB> in the Kingdom of Bahrain, focusing especially on public awareness of PM<SUB>2.5</SUB>, its sources, and its health impacts. It further highlights actions taken by individuals to mitigate associated health impacts. This cross sectional study was based on the Driver-Pressure-State-Impact-Response framework. A self-administered questionnaire was distributed to the public, a total sample size of 263 responses. Descriptive statistics, including frequencies and percentages of participants’ responses, were calculated. The Independent Samples t-test and a one-way analysis of variance (ANOVA) were applied along with the Chi-Square test to identify factors associated with the public’s knowledge and practices relating to PM<SUB>2.5</SUB> in Bahrain. A p-value of less than 0.05 was considered as statistically significant. A significant proportion of the participants were unaware of PM<SUB>2.5</SUB>, its concentration in Bahrain, and whether it is being measured. However, the majority of respondents had respiratory problems and took self-protective measures when the air quality was bad. There were statistically significant differences in the adoption of precautionary measures, which was prevalent among participants suffering from respiratory problems. Around 32% of the respondents were willing to pay monthly contributions to improve air quality and indicated their interest in receiving information on Bahrain’s air quality via social and mass media. The findings suggest that there is a need to raise public awareness towards air pollution and its health effects. Moreover, epidemiological studies should be conducted to advance understanding on how air pollution is linked to morbidity and mortality in Bahrain.