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Toxicity evaluation of ZnO and TiO_2 nanomaterials in hydroponic red bean(Vigna angularis) plant:Physiology, biochemistry and kinetic transport

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Journal of Environmental Sciences 2018年第10期30卷 140-152页

作者： Shanaz Jahan Yatimah Binti Alias Ahmad Farid Bin Abu Bakar ismail Bin yusoff Department of Geology Environmental and Earth Sciences Faculty of Science University of Malaya Department of Chemistry Faculty of Science University of Malaya University Malaya Centre for Ionic Liquids (UMCi L) University of Malaya

The toxicity and kinetic uptake potential of zinc oxide（Zn O） and titanium dioxide（TiO2）nanomaterials into the red bean（Vigna angularis） plant were investigated. The results obtained revealed that Zn O, due to its high dissolution and strong binding capacity, readily accumulated in the root tissues and significantly inhibited the physiological activity of the plant. However, TiO2 had a positive effect on plant physiology, resulting in promoted growth. The results of biochemical experiments implied that Zn O, through the generation of oxidative stress, significantly reduced the chlorophyll content, carotenoids and activity of stress-controlling enzymes. On the contrary, no negative biochemical impact was observed in plants treated with TiO2. For the kinetic uptake and transport study, we designed two exposure systems in which Zn O and TiO2 were exposed to red bean seedlings individually or in a mixture approach. The results showed that in single metal oxide treatments, the uptake and transport increased with increasing exposure period from one week to three ***, in the metal oxide co-exposure treatment, due to complexation and competition among the particles, the uptake and transport were remarkably decreased. This suggested that the kinetic transport pattern of the metal oxide mixtures varied compared to those of its individual constituents.

关键词： Metal oxides Physiological impacts Biochemical impacts Uptake kinetics Translocation Growth inhibition

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Comparison of a plant based natural surfactant with SDS for washing of As(V) from Fe rich soil

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Journal of Environmental Sciences 2013年第11期25卷 2247-2256页

作者： Soumyadeep Mukhopadhyay Mohd. Ali Hashim Jaya Narayan Sahu ismail yusoff Bhaskar Sen Gupta Department of Chemical Engineering University of Malaya Department of Geology University of Malaya School of Planning Architecture and Civil Engineering Queen's University Belfast

This study explores the possible application of a biodegradable plant based surfactant, obtained from Sapindus mukorossi, for washing low levels of arsenic （As） from an iron （Fe） rich soil. Natural association of As（Ⅴ） with Fe（Ⅲ） makes the process difficult. Soapnut solution was compared to anionic surfactant sodium dodecyl sulfate （SDS） in down-flow and a newly introduced suction mode for soil column washing. It was observed that soapnut attained up to 86% efficiency with respect to SDS in removing As. Full factorial design of experiment revealed a very good fit of data. The suction mode generated up to 83 kPa pressure inside column whilst down-flow mode generated a much higher pressure of 214 kPa, thus making the suction mode more efficient. Micellar solubilisation was found to be responsible for As desorption from the soil and it followed 1st order kinetics. Desorption rate coefficient of suction mode was found to be in the range of 0.005 to 0.01, much higher than down-flow mode values. Analysis of the PT-IR data suggested that the soapnut solution did not interact chemically with As, offering an option for reusing the surfactant. Soapnut can be considered as a soil washing agent for removing As even from soil with high Fe content.

关键词： soil washing soapnut Sapindus mukorossi arsenic plant based surfactant

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Antimonene-based saturable absorber for a soliton mode-locked and Q-switched fiber laser in the 2 μm wavelength region

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Chinese Physics B 2023年第6期32卷 259-269页

作者： H Ahmad B Nizamani M Z Samion N yusoff M F ismail Photonics Research Centre Universiti Malaya50603 Kuala LumpurMalaysia Physics Department Faculty of ScienceUniversiti Malaya50603 Kuala LumpurMalaysia Distinguished Visiting Professor Universiti Kuala Lumpur British Malaysian Institute(UniKL BMI)Batu 8Jln Sungai Pusu53100SelangorMalaysia

We demonstrate antimonene as a saturable absorber(SA) to generate an ultrafast mode-locked and Q-switched laser in the 2 μm wavelength region. The two antimonene-based SAs were prepared and inserted separately in a thulium–holmiumdoped fiber laser to produce the pulsed laser. Antimonene was coated onto a tapered fiber to generate soliton mode-locked pulses and used in thin-film form for the generation of Q-switched pulses. The mode-locking was stable within a pump power of 267 m W–511 m W, and the laser operated at a central wavelength of 1897.4 nm. The mode-locked laser had a pulse width of 1.3 ps and a repetition rate of 12.6 MHz, with a signal-to-noise ratio of 64 d B. Q-switched laser operation was stable at a wavelength of 1890.1 nm within a pump power of 312 m W–381 m W. With the increase in pump power from 312 m W to 381 m W, the repetition rate increased to a maximum of 56.63 k Hz and the pulse width decreased to a minimum value of 2.85 μs. Wide-range tunability of the Q-switched laser was also realized within the wavelength range of1882 nm–1936 nm.

关键词： mode-locking Q-switched fiber laser optical saturable absorber

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A review of extreme condition effects on solder joint reliability:Understanding failure mechanisms

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Defence Technology（防务技术） 2024年第11期41卷 134-158页

作者： Norliza ismail Wan Yusmawati Wan yusoff Azuraida Amat Nor Azlian Abdul Manaf Nurazlin Ahmad Department of Physics Centre for Defence Foundation StudiesUniversiti Pertahanan Nasional MalaysiaKem Sungai BesiKuala Lumpur57000Malaysia Centre for Tropicalization(CENTROP) Defence Research InstituteUniversiti Pertahanan Nasional MalaysiaKem Sungai BesiKuala Lumpur57000Malaysia

Solder joint,crucial component in electronic systems,face significant challenges when exposed to extreme conditions during *** solder joint reliability involving microstructure and mechanical properties will be affected by extreme *** the behaviour of solder joints under extreme conditions is vital to determine the durability and reliability of solder *** review paper aims to comprehensively explore the underlying failure mechanism affecting solder joint reliability under extreme *** study covers an in-depth analysis of effect extreme temperature,mechanical stress,and radiation conditions towards solder *** of each condition to the microstructure including solder matrix and intermetallic compound layer,and mechanical properties such as fatigue,shear strength,creep,and hardness was thoroughly *** failure mechanisms were illustrated in graphical diagrams to ensure clarity and ***,the paper highlighted mitigation strategies that enhancing solder joint reliability under challenging operating *** findings offer valuable guidance for researchers,engineers,and practitioners involved in electronics,engineering,and related fields,fostering advancements in solder joint reliability and performance.

关键词： Solder joint Extreme condition Failure mechanism Defence and military Reliability

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Novel Nano Structure for Green Energy Harvesting at 10μm Thermal Radiation

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Journal of Electronic Science and Technology 2016年第3期14卷 242-248页

作者： Mohd Khairul Hisham ismail Mazlina Esa Mohd Fairus Mohd yusoff Noor Asniza Murad National Space Agency Banting 42700Malaysia the Faculty of Electrical engeering Universiti Teknologi MalaysiaJohor Bahru 81310Malaysia

In recent years, the potential of renewable green energy sources has been extensively studied. The proven technology which is photovoltaic solar cells strictly depends on daylight and produces low-efficiently. To overcome the restrictions, one technology studied is through harvesting the thermal radiation energy which can provide a 24-hour energy source. The continuity of energy sources promises very good energy conversion especially for military applications. This article presents a new structure that can harvest the abundant thermal radiation energy into usable energy at the wavelength of l0 lum. A rectangular structure with a perturbation slit was designed to integrate with a rectifier circuit for green energy conversion. The slit tunnel junction guided the electromagnetic field into a junction where the energy could be collected and converted. An enhancement factor of approximately 110.6 can be achieved by a perturbation slit length of 1.0 μm. The results extracted from the proposed design promise a better candidate to overcome the disadvantages of photovoltaic solar cells for energy harvesting devices.

关键词： Enhancement factor green energy harvesting renewable thermal radiation.

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A comprehensive review of radiation effects on solder alloys and solder joints

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Defence Technology（防务技术） 2024年第9期39卷 86-102页

作者： Norliza ismail Wan Yusmawati Wan yusoff Nor Azlian Abdul Manaf Azuraida Amat Nurazlin Ahmad Emee Marina Salleh Department of Physics Centre for Defence Foundation StudiesUniversiti Pertahanan Nasional MalaysiaKem Sungai BesiKuala Lumpur 57000Malaysia Department of Mineral and Geoscience Malaysia Mineral Research CentreJalan Sultan Azlan ShahIpoh 31400PerakMalaysia

In the realm of military and defence applications, exposure to radiation significantly challenges the performance and reliability of solder alloys and joints in electronic systems. This comprehensive review examines radiation-induced effects on solder alloys and solder joints in terms of microstructure and mechanical properties. In this paper, we evaluate the existing literature, including experimental studies and fundamental theory, to provide a comprehensive overview of the behavior of solder materials under radiation. A review of the literature highlights key mechanisms that contribute to radiation-induced changes in the microstructure, such as the formation of intermetallic compounds, grain growth,micro-voids and micro-cracks. Radiation is explored as a factor influencing solder alloy hardness,strength, fatigue and ductility. Moreover, the review addresses the challenges and limitations inherent in studying the effects of radiation on solder materials and offers recommendations for future research. It is crucial to understand radiation-induced effects on solder performance to design robust and radiationresistant electronic systems. A review of radiation effects on solder materials and their applications in electronics serves as a valuable resource for researchers, engineers, and practitioners in that field.

关键词： Defence technology Solder alloy Solder joints Radiation-induced effect Microstructure Mechanical properties

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ANN-based empirical modelling of pile behaviour under static compressive loading

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Frontiers of Structural and Civil Engineering 2018年第4期12卷 594-608页

作者： Abdussamad ismail Department of Civil Engineering Bayero UniversityKanoNigeria

Artificial neural networks have been widely used over the past two decades to successfully develop empirical models for a variety of geotechnical problems. In this paper, an empirical model based on the product-unit neural network (PUNN) is developed to predict the load-deformation behaviour of piles based SPT values of the supporting soil. Other parameters used as inputs include particle grading, pile geometry, method of installation as well as the elastic modulus of the pile material. The model is trained using full-scale pile loading tests data retrieved from FHWA deep foundations database. From the results obtained, it is observed that the proposed model gives a better simulation of pile load-deformation curves compared to the Fleming’s hyperbolic model and t-z approach.

关键词： piles in compression load-deformation behaviour product-unit neural network

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Estimating moment capacity of ferrocement members using self-evolving network

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Frontiers of Structural and Civil Engineering 2019年第4期13卷 926-936页

作者： Abdussamad ismail Department of Civil Engineering Bayero University Kano Kano State PMB 3011 Nigeria

In this paper, an empirical model based on self-evolving neural network is proposed for predicting the flexural behavior of ferrocement elements. The model is meant to serve as a simple but reliable tool for estimating the moment capacity of ferrocement members. The proposed model is trained and validated using experimental data obtained from the literature. The data consists of information regarding flexural tests on ferrocement specimens which include moment capacity and cross-sectional dimensions of specimens, concrete cube compressive strength, tensile strength and volume fraction of wire mesh. Comparisons of predictions of the proposed models with experimental data indicated that the models are capable of accurately estimating the moment capacity of ferrocement members. The proposed models also make better predictions compared to methods such as the plastic analysis method and the mechanism approach. Further comparisons with other data mining techniques including the back-propagation network, the adaptive spline, and the Kriging regression models indicated that the proposed models are superior in terms prediction accuracy despite being much simpler models. The performance of the proposed models was also found to be comparable to the GEP-based surrogate model.

关键词： ferrocement moment capacity self-evolving neural network

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Numerical and Experimental Study of the Impact of Key Parameters on a PVT Air Collector:Mass Flow Rate and Duct Depth

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Journal of Thermal Science 2021年第5期30卷 1625-1642页

作者： ismail BAKLOUTI Zied DRISS National School of Engineers of Monastir University of Monastir5019MonastirTunisia Laboratory of Electromechanical Systems(LASEM) National School of Engineers of SfaxUniversity of Sfax3038SfaxTunisia

The PVT-air solar system simultaneously generates electrical and thermal ***,increasing the cost-effectiveness of the system requires an appropriate choice of key parameters such as mass flow rate and air channel *** this paper,a PVT-air kit of a single module with a 30°slope was used to measure photovoltaic electricity and air heating power in the city of Sfax,***,a computer method was implemented using the ANSYS Fluent 17.0 software and the MATLAB program to analyse the properties of the airflow and to characterise PVT-air yields under different mass flow rates and *** the comparison of numerical and experimental data,the numerical method was validated with a good ***,we have found that increasing of the airflow rate improves the thermal efficiency with a slight change on electrical ***,the reduction in depth shows an improvement on thermal efficiency and a negligible effect on electrical ***,we have presented the thermal and electrical performance of PVT-air as a function of the key parameters with the Hottel-Whillier-Bliss formulation.

关键词： solar energy PVT-air thermal experimental numerical performance

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Availability of seismic vulnerability index(K_g) in the assessment of building damage in Van, Eastern Turkey

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Earthquake Engineering and Engineering Vibration 2020年第1期19卷 189-204页

作者： ismail Akkaya Van Yüzüncü Yil University Engineering FacultyDepartment of Geophysical Engineering

The seismic vulnerability index(Kg) is a parameter that depends on the dynamic properties of soil. With this parameter, it is possible to evaluate the vulnerability of a point-based site under strong ground motion. Since it is related to the natural vibration period and amplification factor, the parameter can be calculated for both soil and structure. In this study, HVSR microtremor measurements are recorded at more than 200 points in the Van region to generate a seismic vulnerability index map. After generating the map, it is determined that the hazard potential and seismic vulnerability index is high at the sites close to Van Lake and at the densely populated city center. Damage information of the buildings investigated after the 2011 Van earthquakes(Mw = 7.1) are placed on the seismic vulnerability index map and it is realized that there may be a correlation between the damage and the seismic vulnerability index. There is a high correlation, approximately 80 percent, between the damage rate map based on the damaged building data and the K_g values. In addition, vulnerability indexes of buildings are calculated and the effect of local soil conditions and building properties on the damage levels are determined. From the results of this study and the site observations after the 2011 Van earthquakes, it is found that structural damage is not only structure-dependent but is also related to the dynamic behavior of soil layers and local soil conditions.

关键词： seismic vulnerability index building damage HVSR soil-structure interaction

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