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Disinfection of dairy wastewater effluent through solar photocatalysis processes

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Water Science and Engineering 2018年第3期11卷 214-219页

作者： mojtaba Afsharnia mojtaba Kianmehr Hamed Biglari Abdollah Dargahi Abdolreza Karimi Faculty of Health Gonabad University of Medical Sciences Faculty of Medicine Gonabad University of Medical Sciences Faculty of Health Kermanshah University of Medical Sciences Faculty of Engineering Qom University of Technology

Due to the strict regulations and reuse policies that govern wastewater's use as an irrigation water resource for agricultural purposes, especially in dry climates, optimization of the disinfection process is of the utmost importance. The effects of solar radiation along with Titanium dioxide(TiO_2) nanoparticles applied to optimization of the photolysis and photocatalysis processes for inactivating heterotrophic bacteria were investigated. Temperature, p H, and dissolved oxygen fluctuations in the dairy wastewater effluent treated by activated sludge were examined. In addition,different dosages of TiO_2 were tested in the solar photocatalysis(ph-C S) and concentrated solar photocatalysis(ph-C CS) processes. The results show that the disinfection efficiencies of the solar photolysis(ph-L S) and concentrated solar photolysis(ph-L CS) processes after 30 min were about 10.5% and 68.9%, respectively, and that the ph-C S and ph-C CS processes inactivated 41% and 97% of the heterotrophic bacteria after 30 min, respectively. The p H variation in these processes was negligible. Using the ph-L CS and ph-C CS processes, the synergistic effect between the optical and thermal inactivation caused complete disinfection after three hours. However, disinfection was faster in the ph-C CS process than in the ph-L CS process. Significant correlations were found between the disinfection efficiency and the variation of the dissolved oxygen concentration in the ph-C S and ph-C CS processes, while the correlations between the disinfection efficiency and temperature variation were not significant in the ph-L S and ph-C S processes. Moreover, the oxygen consumption rate was greatest(3.2 mg··L^(-1)) in the ph-C CS process. Hence,it could be concluded that the ph-C CS process is an efficient photocatalysis process for disinfection of dairy wastewater effluent.

关键词： Dairy wastewater Disinfection Photocatalyst Solar Photolysis and photocatalysis TiO2

Heavy Charged Gauge Bosons with General CP Violating Couplings

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Communications in Theoretical Physics 2010年第6期53卷 1137-1139页

作者： mojtaba Mohammadi Najafabadi School of Particles and Accelerators Institute for Research in Fundamental Sciences (IPM)

Heavy gauge bosons such as W＇ are expected to exist in many extensions of the Standard Model. In this paper, the most general Lagrangian for the interaction of W＇ with top and bottom quarks is considered. This Lagrangian consists of V- A and V ＋ A structure with in general complex couplings. Such interactions produce an Electric Dipole Moment （EDM） for the top quark at one loop level. We predict the allowed ranges for the mass and couplings of W＇ by using the upper limit on the top quark EDM.

关键词： heavy gauge boson electric dipole moment

Optimal setting and placement of FACTS devices using strength Pareto multi-objective evolutionary algorithm

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Journal of Central South University 2017年第4期24卷 829-839页

作者： Amin Safari Hossein Shayeghi mojtaba Bagheri Department of Electrical Engineering Azarbaijan Shahid Madani University Tabriz Iran Sama Technical and Vocational Training College Islamic Azad University Bonab Branch Bonab Iran Technical Engineering Department University of Mohaghegh Ardabili Ardabil Iran

This work proposes a novel approach for multi-type optimal placement of flexible AC transmission system(FACTS) devices so as to optimize multi-objective voltage stability problem. The current study discusses a way for locating and setting of thyristor controlled series capacitor(TCSC) and static var compensator(SVC) using the multi-objective optimization approach named strength pareto multi-objective evolutionary algorithm(SPMOEA). Maximization of the static voltage stability margin(SVSM) and minimizations of real power losses(RPL) and load voltage deviation(LVD) are taken as the goals or three objective functions, when optimally locating multi-type FACTS devices. The performance and effectiveness of the proposed approach has been validated by the simulation results of the IEEE 30-bus and IEEE 118-bus test systems. The proposed approach is compared with non-dominated sorting particle swarm optimization(NSPSO) algorithm. This comparison confirms the usefulness of the multi-objective proposed technique that makes it promising for determination of combinatorial problems of FACTS devices location and setting in large scale power systems.

关键词： strength Pareto multi-objective evolutionary algorithm static var compensator (SVC) thyristor controlled series capacitor (TCSC) static voltage stability margin optimal location

Thermal Spin Squeezing as a Signature of Thermal Global Entanglement in Heisenberg Models

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Communications in Theoretical Physics 2012年第8期58卷 198-204页

作者： mojtaba Jafarpour Azita Naji Physics Department Shahid Chamran University

We study thermal spin squeezing (TSS) and thermal global entanglement (TGE) in a general Heisenberg spin chain, in the presence of Dzyaloshinskii-Moriya interaction and an external magnetic field. We derive an inequality associating the squeezing parameter and the global concurrence, which establishes (TSS) as a signature of (TGE). The inequality reduces to equality for particular symmetric chains which also associates TSS with bipartite entanglement in such systems. We also check the results by presenting two numerical examples.

关键词： thermal spin squeezing thermafglobal entanglement Heisenberg model global concurrence

Eigenmode operation of piezoelectric resonant gyroscopes

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Microsystems & Nanoengineering 2020年第1期6卷 95-105页

作者： mojtaba Hodjat-Shamami Farrokh Ayazi School of Electrical and Computer Engineering Georgia Institute of TechnologyAtlantaGA 30308USA

The theory of eigenmode operation of Coriolis vibratory gyroscopes and its implementation on a thin-film piezoelectric gyroscope is *** is shown analytically that the modal alignment of resonant gyroscopes can be achieved by applying a rotation transformation to the actuation and sensing directions regardless of the transduction *** technique is especially suitable for mode matching of piezoelectric gyroscopes,obviating the need for narrow capacitive gaps or DC polarization *** can also be applied for mode matching of devices that require sophisticated electrode arrangements for modal alignment,such as electrostatic pitch and roll gyroscopes with slanted electrodes utilized for out-of-plane quadrature *** operation of a 3.15MHz AlN-on-Si annulus resonator that utilizes a pair of high-Q degenerate in-plane vibration modes is *** alignment of the piezoelectric gyroscope is accomplished through virtual alignment of the excitation and readout electrodes to the natural direction of vibration mode shapes in the presence of fabrication *** displacement feedback of the gyroscope drive signal is implemented to achieve frequency matching of the two gyroscopic *** piezoelectric gyroscope shows a mode-matched operation bandwidth of~250Hz,which is one of the largest open-loop bandwidth values reported for a mode-matched MEMS gyroscope,a small motional resistance of~1300Ω owing to efficient piezoelectric transduction,and a scale factor of 1.57nA/°/s for operation at atmospheric pressure,which greatly relaxes packaging *** operation results in an~35dB reduction in the quadrature error at the resonance *** measured angle random walk of the device is 0.86°/√h with a bias instability of 125°/h limited by the excess noise of the discrete electronics.

关键词： polarization piezoelectric mode

Evaluation of the mechanical degradation of carbonate aggregate by rock strength tests

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Journal of Rock Mechanics and Geotechnical Engineering 2019年第1期11卷 121-134页

作者： mojtaba Kamani Rassoul Ajalloeian Department of Ceology University of Isfahan

Aggregate degradation(AD) is one of the major reasons accounting for failure of aggregate materials, and the mechanical degradation of aggregate materials can be determined by different test methods. This process basically requires many aggregate samples and special instruments, and thus is *** main purpose of this research is to evaluate the possibility of estimating the AD characteristics using rock strength tests and to investigate the relationships between AD properties and rock strength *** understanding the relationships, two common rock strength tests are employed, i.e. unconfined compressive strength(UCS) and point load index(PLI) tests. In the tests, the AD properties of 40 kinds of carbonate aggregates sampled from Iran were studied. The AD properties were determined by Los Angeles abrasion value(LAAV), aggregate impact value(AIV) and aggregate crushing value(ACV). Also,the samples are classified according to the strength and rock types, and the effect of this classification is investigated based on the relationship between rock strengths and AD properties. The results indicate that the PLI is better than UCS for evaluation of AD properties. Among rock strength tests, PLI has a closer relationship with AIV(R^2 = 0.832). Also, UCS has relative larger effects on the ACV(R^2 = 0.812) under the same loading condition. The weakest correlation occurs between LAAV and UCS(R^2 = 0.679). In view of the rational AD properties in the predictive procedure, it is possible to predict AD properties based on the strength tests and rock types. The results also show that the prediction of AD properties using rock strength test based on rock types yields better correlations than that using unclassified samples. The classification based on rock types can extrapolate the different relationships of AD prediction from rock strength tests. The results in this context could be used for preliminarily selecting proper rock aggregates with a limit of allowable AD

关键词： Aggregate degradation Unconfined compressive strength Point load index Carbonate aggregates

Secure ticket-based authentication method for IoT applications

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Digital Communications and Networks 2023年第3期9卷 710-716页

作者： mojtaba Alizadeh Mohammad Hesam Tadayon Alireza Jolfaei Computer Engineering Department Lorestan UniversityKhorramabadIran Iran Telecommunication Research Center(ITRC) TehranIran Department of Computing Macquarie UniversitySydneyAustralia

The recent surge in the number of machines,appliances,and services connected to the Internet demands secure processing and transmission of sensory *** plays a crucial role in a typical security model used in the Internet of Things(IoT),and it protects data communications from various attacks,such as impersonation and denial of service,by verifying and allowing legitimate users to access the IoT ***,recent authentication literature has not addressed the need for developing a scalable and efficient authentication method in this *** paper proposes a secure and anonymous ticket-based authentication method for the *** proposed method protects the network from various security and privacy threats such as data alternation and denial of service while also offering mutual authentication and sensor *** security and performance evaluations confirm the improvement.

关键词： IoT Internet of things Authentication Privacy Security

Reliability assessment of networks-on-chip based on analytical models

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第12期10卷 1801-1814页

作者： mojtaba VALINATAJ Siamak MOHAMMADI Saeed SAFARI School of Electrical and Computer Engineering College of Engineering University of Tehran

As technology scales down, the reliability issues are becoming more crucial, especially for networks-on-chip (NoCs) that provide the communication requirements of multi-processor systems-on-chip. Reliability evaluation based on analytical models is a precise method for dependability analysis before and after designing the fault-tolerant systems. In this paper, we accurately formulate the inherent reliability and vulnerability of some popular NoC architectures against permanent faults, also depending on the employed routing algorithm and traffic model. Based on this analysis, effects of failures in the links, switches and network interfaces on the packet delivery of NoCs are determined. Besides, some extensions to evaluate a fault-tolerant method and some routing algorithms are described. The analyses are validated through appropriate simulations. The results thus obtained are exactly the same as or very close to the analytical ones.

关键词： Networks-on-chip (NoCs) Traffic model Routing algorithm Reliability assessment Permanent fault

Feasibility of using wind turbines for renewable hydrogen production in Firuzkuh, Iran

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Frontiers in Energy 2019年第3期13卷 494-505页

作者： Ali MOSTAFAEIPOUR mojtaba QOLIPOUR Hossein GOUDARZI Industrial Engineering Department Yazd UniversityYazd 89158-18411Iran School of Architecture and Environmental Design Iran University of Science and TechnologyTehran 16846-13114Iran

The present study was conducted with the objective of evaluating several proposed turbines from 25 kW to 1.65 MW in order to select the appropriate turbine for electricity and hydrogen production in Firuzkuh area using the decision making trial and evaluation (DEMATEL) and data envelopment analysis (DEA) methods. Initially, five important factors in selection of the best wind turbine for wind farm construction were determined using the DEMATEL technique. Then, technical-economic feasibility was performed for each of the eight proposed turbines using the HOMER software, and the performance score for each proposed wind turbine was obtained. The results show that the GE 1.5sl model wind turbine is suitable for wind farm construction. The turbine can generate 5515.325 MW of electricity annually, which is equivalent to $ 1103065. The average annual hydrogen production would be 1014 kg for Firuzkuh by using the GE 1.5sl model turbine.

关键词： wind turbine hydrogen production HOMER software decision making trial and evaluation (DEMA丒 TEL) data envelopment analysis (DEA) Firuzkuh