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One-dimensional structure made of periodic slabs of SiO2/InSb offering tunable wide band gap at terahertz frequency range

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Chinese Physics B 2019年第12期28卷 170-179页

作者： Sepehr razi Fatemeh Ghasemi Faculty of Electrical Engineering Urmia University of Technology(UUT)UrmiaIran Department of Energy Engineering and Physics Amirkabir University of Technology TechnologyPO Box 15875-4413TehranIran

Optical features of a semiconductor–dielectric photonic crystal are studied theoretically. Alternating layers of micrometer sized SiO2/In Sb slabs are considered as building blocks of the proposed ideal crystal. By inserting additional layers and disrupting the regularity, two more defective crystals are also proposed. Photonic band structure of the ideal crystal and its dependence on the structural parameters are explored at the first step. Transmittance of the defective crystals and its changes with the thicknesses of the layers are studied. After extracting the optimum values for the thicknesses of the unit cells of the crystals, the optical response of the proposed structures at different temperatures and incident angles are investigated. Changes of the defect layers’ induced mode(s) are discussed by taking into consideration of the temperature dependence of the In Sb layer permittivity. The results clearly reflect the high potential of the proposed crystals to be used at high temperature terahertz technology as a promising alternative to their electronic counterparts.

关键词： photonic band gap photonic crystal semiconductor layer defect mode

An efficient technique to retrieve information from a damaged near-field communication tag

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International Journal of Intelligent Computing and Cybernetics 2017年第1期10卷 41-51页

作者： Dawer Saeed razi Iqbal Al-Khawarizmi Institute of Computer Science University of Engineering and TechnologyLahoreLahorePakistan College of Computer Information Technology American University in the EmiratesDubaiUnited Arab Emirates

Purpose-The purpose of this paper is to discuss a technique of restoring data from a broken/damaged near-field communication(NFC)tag whose coil is damaged and seems ***/methodology/approach-This paper discusses a method to restore data from damaged NFC tags by designing a coil that matches the technical specification of NFC for restoring *** this paper,an NFC tag with a broken antenna coil and its operational NFC chip is used for restoring data by making an external loop antenna for the same ***-If the NFC tag is damaged,the information stored on the tag can be lost and can cause serious *** research provides an excellent mechanism for retrieving all the information accurately from a damaged NFC tag provided the NFC chip is not *** limitations/implications-One of the major limitations of this research is that the NFC chip remains intact without any *** can only be recoverable if just the antenna of the NFC tag is damaged;any damage to the NFC chip would make it impossible for the data to be *** implications-The research is carried out with limited resources in an academic institute and hence cannot be compared to antenna designs of the ***,industry vendors are using aluminum to design the coil;however,in this study a copper coil is used for coil design since it is far less expensive than aluminum ***/value-NFC is a rather new short-range wireless technology and not much work is done in this field as far as antenna study is *** study brings a technique to design a coil antenna for a damaged NFC tag to retrieve all the information without losing even a single bit of sensitive information.

关键词： Near-field communication Radio frequency identification Antenna design Mutual inductance Short-range wireless communication

Decision Making in Internet of Vehicles Using Pervasive Trusted Computing Scheme

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Computers, Materials & Continua 2021年第8期68卷 2755-2769页

作者： Geetanjali Rathee razi Iqbal Adel Khelifi Department of Computer Science and Engineering Jaypee University of Information TechnologyWaknaghatSolan173234Himachal PradeshIndia Department of Computer Information Systems University of Fraser ValleyCanada Department of Computer Science and IT Abu Dhabi UniversityUnited Arab EmiratesUAE

Pervasive schemes are the significant techniques that allow intelligent communication among the devices without any human *** Internet of Vehicles(IoVs)has been introduced as one of the applications of pervasive computing that addresses the road safety *** participating within the IoV are embedded with a wide range of sensors which operate in a real time environment to improve the road safety *** mechanisms have been proposed which allow automatic actions based on uncertainty of sensory and managed *** to the lack of existing transportation integration schemes,IoV has not been completely explored by business *** order to tackle this problem,we have proposed a novel trusted mechanism in IoV during communication,sensing,and record *** proposed method uses trust based analysis and subjective logic functions with the aim of creating a trust environment for vehicles to *** addition,the subjective logic function is integrated with multi-attribute SAW scheme to improve the decision metrics of authenticating *** trust analysis depends on a variety of metrics to ensure an accurate identification of legitimate vehicles embedded with IoT devices *** proposed scheme is determined and verified rigorously through various IoT devices and decision making metrics against a baseline *** simulation results show that the proposed scheme leads to 88%improvement in terms of better identification of legitimate nodes,road accidents and message alteration records during data transmission among vehicles as compared to the baseline approach.

关键词： Pervasive computing vehicular networks security trust decision schemes trusted internet of vehicles big data

Selective Sensing Characteristics of Ca Doped BeO Nano-sized Tube toward H20 and NH3

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Chinese Journal of Chemical Physics 2013年第5期26卷 612-616,I0004页

作者： Maziar Noei Vali Zare-Shahabadi Seyedeh Najmeh razi Department of Chemistry Mahshahr Branch Islamic Azad University Mahshahr Iran Young and Elite Reaserchers Club Mahshahr Branch Islamic Azad University Mahshahr Iran

By means of density functional calculations, the structural and electronic properties of chemical modification of pristine and Ca-doped BeO nanotubes were investigated with NH3 and H20 molecules. It was found that the NH3 and H20 molecules can be adsorbed on the Be atom of the tube sidewall with the adsorption energies of about 36.1 and 39.0 kcal/mol, respectively. Density of states analysis shows that the electronic properties of the BeONT are slightly changed after the adsorption processes. Substitution of a Be atom in the tube surface with a Ca atom increases the adsorption energies by about 7.4 and 14.7 kcal/mol for NH3 and H20, respectively. Unlike the pristine tube, the electronic properties of Ca-doped BeONT are sensitive to NH3 and H20 molecules. Also, the Ca-doped tube is much more sensitive to H20 molecule than NH3 one.

关键词： Doping Density functional theory Sensor B3LYP

Optimization of process parameters for the bioconversion of activated sludge by Penicillium corylophilum, using response surface methodology

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Journal of Environmental Sciences 2007年第1期19卷 23-28页

作者： Sarkar Mannan Ahmadun Fakhru'l-razi Md Zahangir Alam Department of Chemical and Environmental Engineering Faculty of Engineering University Putra Malaysia (UPM)43400 UPM SerdangSelangorD.E.Malaysia. Department of Biotechnology Engineering Faculty of Engineering International Islamic University Malaysia (IIUM)Jalan Gombak53100 Kuala LumpurMalaysia.

The optimization of process parameters for the bioconversion of activated sludge by Penicillium corylophilum was investigated using response surface methodology （RSM）. The three parameters namely temperature of 33℃, agitation of 150 r/min, and pH of 5 were chosen as center point from the previous study of fungal treatment. The experimental data on chemical oxygen demand （COD） removal （%） were fitted into a quadratic polynomial model using multiple regression analysis. The optimum process conditions were determined by analyzing response surface three-dimensional surface plot and contour plot and by solving the regression model equation with Design Expert software. Box-Behnken design technique under RSM was used to optimize their interactions, which showed that an incubation temperature of 32.5℃, agitation of 105 r/min, and pH of 5.5 were the best conditions. Under these conditions, the maximum predicted yield of COD removal was 98.43%. These optimum conditions were used to evaluate the trail experiment, and the maximum yield of COD removal was recorded as 98.5%.

关键词： optimization response surface methodology Penicillium activated sludge domestic wastewater sludge

Detailed electro-dynamic model of an ultra-fast disconnector including the failure mode

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High Voltage 2020年第5期5卷 549-555页

作者： Mario Zaja Ali Asghar razi-Kazemi Dragan Jovcic School of Engineering University of AberdeenAB243UEAberdeenUK

Ultra-fast disconnector(UFD)is a key component of hybrid DC circuit breakers and it is also studied as the main switch in some DC grid topologies.A UFD model suitable for DC grid studies and considering both normal operation and failure mode is *** dynamic motion of contacts is analysed in detail and it is concluded that Thomson coil inductances including parasitic parameters play an important role and it is recommended to use finite element *** arcing mode of UFD is repressed using a variable resistance in series with an ideal *** variable resistance is calculated analytically based on the instantaneous position of contacts and the circuit *** different arc models are recommended:for the air-insulated UFD and SF6 UFD,and in each case,two operating regimes should be considered:high and low *** UFD model is verified for both normal operation and failure mode using measurements on a 5 kV laboratory UFD and the results show very good *** 320 kV SF6 UFD model is evaluated using limited reported results from manufacturers.

关键词： mode dynamic Thomson

Evaluation of fungal potentiality for bioconversion of domestic wastewater sludge

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Journal of Environmental Sciences 2004年第1期16卷 132-137页

作者： Zahangir Alam A. Fakhru'l-razi Abul H. Molla Department of Chemical and Environmental Engineering Faculty of EngineeringUniversiti Putra Malaysia 43400 UPM SerdangSelangor DE Malaysia Department of Biotechnology Engineering Faculty of Engineering International Islamic University Malaysia Jalan Gombak 53100 Kuala Lumpur Malaysia

This study was undertaken to screen the filamentous fungi isolated from its relevant habitats(wastewater, sewage sludge and sludge cake) for the bioconversion of domestic wastewater sludge. A total of 35 fungal strains were tested against wastewater sludge (total suspended solids, TSS 1%—5% w/w) to evaluate its potentiality for enhancing the biodegradability and dewaterability using liquid state bioconversion(LSB) process. The strains were divided into five groups i.e. Penicillium, Aspergillus, Trichoderma, Basidiomycete and Miscellaneous, respectively. The strains WWZP1003, SCahmA103, SCahmT105 and PC-9 among their respective groups of Penicillium, Aspergillus, Trichoderma and Basidiomycete played potential roles in terms of separation(formation of pellets/flocs/filaments), biodegradation(removal of COD) and filtration(filterability) of treated domestic wastewater sludge. The Miscellaneous group was not considered due to its unsatisfactory results as compared to the other groups. The pH value was also influenced by the microbial treatment during fermentation process. The filterability of treated sludge was improved by fungal treatment, and lowest filtration time was recorded for the strain WWZP1003 and SCahmA103 of Penicillium and Aspergillus groups respectively compared with other strains.

关键词： filamentous fungi screening wastewater sludge pellets filtration liquid state bioconversion

Combined medial patellofemoral ligament and medial patellotibial ligament reconstruction in recurrent patellar instability:A systematic review and meta-analysis

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World Journal of Clinical Cases 2023年第19期11卷 4625-4634页

作者： Ahmad Abbaszadeh Mohsen Saeedi Amir Human Hoveidaei Haleh Dadgostar Saeed razi Mohammad razi Department of Orthopedic Emam Khomeini Teaching HospitalAhvaz Jundishapur University of Medical SciencesAhvaz ***Iran Sports Medicine Research Center Tehran University of Medical SciencesTehran 14395-578Iran Department of Sports and Exercise Medicine School of MedicineRasool Akram Medical ComplexIran University of Medical SciencesTehran ***Iran Bone and Joint Reconstruction Research Center Department of OrthopedicsSchool of MedicineIran University of Medical SciencesTehran ***Iran Department of Orthopedic Surgery Rasoul Akram HospitalIran University of Medical SciencesTehran ***Iran

BACKGROUND The medial patellofemoral ligament(MPFL),along with the medial patellotibial ligament(MPTL)and medial patellomeniscal ligament,aid in the stabilization of the patellofemoral *** the MPFL is the primary stabilizer and the MPTL is a secondary limiter,this ligament is critical in maintaining joint *** have been few studies on the combined MPFL and MPTL reconstruction and its *** To look into the outcomes of combined MPFL and MPTL reconstruction in frequent patellar *** By May 8,2022,four electronic databases were searched:Medline(PubMed),Scopus,Web of Science,and Google *** keywords such as"patellar instability,""patellar dislocation,""MPFL,""medial patellofemoral ligament,""MPTL,"and"medial patellotibial ligament"were co-searched to increase the sensitivity of the *** The pooled effects of combined MPFL and MPTL reconstruction for Kujala score(12-mo followup)and Kujala score(24-mo follow-up)were positive and incremental,according to the findings of this *** mean difference between the Cincinnati scores was also positive,but not statistically *** combination of the two surgeries reduces *** to cumulative meta-analysis,the trend of pain reduction in various studies is declining over *** The combined MPFL and MPTL reconstruction has good clinical results in knee function and,in addition to providing good control to maintain patellofemoral joint balance,the patient's pain level decreases over time,making it a valid surgical method for patella stabilization.

关键词： Medial patellofemoral ligament reconstruction Medial patellotibial ligament patella dislocation Patella instability

Unhappy triad of the knee:What are the current concepts and opinions?

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World Journal of Orthopedics 2023年第5期14卷 268-274页

作者： Amir Human Hoveidaei Reza Sattarpour Haleh Dadgostar Saeed razi Mohammad razi Sports Medicine Research Center Tehran University of Medical SciencesTehran 14395-578Iran School of Medicine Tehran University of Medical SciencesTehran ***Iran Department of Sports and Exercise Medicine School of MedicineRasool Akram Medical ComplexIran University of Medical SciencesTehran ***Iran Bone and Joint Reconstruction Research Center Department of OrthopedicsSchool of MedicineIran University of Medical SciencesTehran ***Iran Department of Orthopedic Surgery Rasoul Akram HospitalIran University of Medical SciencesTehran ***Iran

The association between injuries to the anterior cruciate ligament,medial collateral ligament,and medial meniscus(MM)has been known to orthopedic surgeons since 1936;O’Donoghue first used the term"unhappy triad"of the knee to describe this condition in *** studies revealed that involvement of the lateral meniscus is more common than MM in these cases,leading to a change in the *** studies have revealed that this triad may be primarily linked to knee anterolateral complex *** there is not a definite management protocol for this triad,we try to mention the most recent concepts about it in addition to expert opinions.

关键词： Anterior cruciate ligament Lateral meniscus Anterolateral complex Medial collateral ligament Medial meniscus