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BVRI photometric observations,light curve solutions and orbital period analysis of BF Pav

Research in Astronomy and Astrophysics 2021年第8期21卷 193-202页

作者： Atila Poro Fahri Alicavus Eduardo Fernández-Lajús fatemeh davoudi PegahSadat MirshafieKhozani Mark G.Blackford Edwin Budding Behjat Zarei Jalalabadi Jabar Rahimi Farzaneh Ahangarani Farahani The International Occultation Timing Association Middle East section Iran Astronomy Department of the Raderon Lab BurnabyBCCanada Canakkale Onsekiz Mart University Faculty of Arts and SciencesDepartment of Physics17020CanakkaleTurkey Canakkale Onsekiz Mart University Astrophysics Research Center and Ulupnar Observatory17020CanakkaleTurkey Instituto de Astrofisica de La Plata(CCT La Plata-CONICET-UNLP) La PlataArgentina Facultad de Ciencias Astronomicas y Geofisicas Universidad Nacional de La PlataPaseo del BosqueB1900FWALa PlataArgentina Variable Stars South(VSS) Congarinni ObservatoryCongarinniNSW2447Australia Carter Observatory 40 Salamanca RdKelburnWellington 6012New Zealand

A new ephemeris,period change analysis and light curve modeling of the W UMa-type eclipsing binary BF Pav are presented in this *** curves of the system taken in BVRI filters from two observatories,in Australia and Argentina,were modeled using the Wilson-Devinney *** results of this analysis demonstrate that BF Pav is a contact binary system with a photometric mass ratio q=1.460 ± 0.014,a fillout factor f=12.5%,an inclination of 87.97 ± 0.45 deg and a cold spot on the secondary *** applying the distance modulus formula,the distance of BF Pav was calculated to be d=268 ± 18 pc which is in good agreement with the Gaia EDR3 *** obtain an orbital period increase at a rate of 0.142 s century-1 due to a quadratic trend in the O-C ***,an alternative sudden period jump probably occurred which could be interpreted as a rapid mass transfer from the lower mass star to its companion of about ΔM=2.45 × 10-6 M⊙.Furthermore,there is an oscillatory behavior with a period of 18.3±0.3 *** BF Pav does not seem to have significant magnetic activity,this behavior could be interpreted as the light-time effect caused by an undetected third body in this *** this case,the probability for the third body to be a low mass star with M≥ 0.075 M⊙or a brown dwarf is 5.4% and 94.6% *** we assume i’=90°,a3=8.04±0.33 *** mass of the secondary component was also determined following two different methods which result close to each other.

关键词： techniques:photometric binaries:eclipsing stars:individual(BF Pav)

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Role of Fibrinogen-like Protein 1 in Tumor Recurrence Following Hepatectomy

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Journal of Clinical and Translational Hepatology 2024年第4期12卷 406-415页

作者： Zahra Shafieizadeh Zohreh Shafieizadeh Maryam davoudi Reza Afrisham Xiaolei Miao Department of Medical Laboratory Sciences School of Allied Medical SciencesTehran University of Medical SciencesTehranIran School of Pharmacy Xianning Medical CollegeHubei University of Science and TechnologyXianningHubeiChina

Partial hepatectomy is a first-line treatment for hepatocellular *** 2 weeks following partial hepatectomy,specific molecular pathways are activated to promote liver ***,residual microtumors may also exploit these pathways to reappear and *** targeting molecules that are differentially regulated between normal cells and malignancies,such as fibrinogen-like protein 1(FGL1),appears to be an effective *** potential functions of FGL1 in both regenerative and malignant cells are discussed within the ambit of this *** FGL1 is normally elevated in regenerative hepatocytes,it is normally downregulated in malignant *** does indeed upregulate FGL1 by increasing the release of transcription factors that promote FGL1,including HNF-1α and STAT3,and inflammatory effectors,such as TGF-β and ***,in turn,stimulates certain proliferative pathways,including EGFR/Src/*** alters the phase transition of highly differentiated hepatocytes from G0 to G1,thereby transforming susceptible cells into cancerous *** of the PI3K/Akt/mTOR pathway by FGL1 allele loss on chromosome 8,a tumor suppressor area,may also cause hepatocellular ***,FGL1 is specifically expressed in the liver via HNF-1α histone acetylase activity,which triggers lipid metabolic reprogramming in ***1 might also be involved in other carcinogenesis processes such as hypoxia,epithelial-mesenchymal transition,immunosuppression,and sorafenib-mediated drug *** study highlights a research gap in these disciplines and the necessity for additional research on FGL1 function in the described processes.

关键词： Fibrinogen-like protein 1 FGL1 Hepatocellular carcinoma Liver regeneration Hepatectomy Lipogenesis Recurrence

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Forced vibration of smart laminated viscoelastic plates by RPT finite element approach

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Acta Mechanica Sinica 2020年第4期36卷 933-949页

作者： Jafar Rouzegar Maryam davoudi Department of Mechanical and Aerospace Engineering Shiraz University of TechnologyShirazIran

In this study,a finite element formulation based on the four-variable refined plate theory(RPT)is presented for forced vibration analysis of laminated viscoelastic composite plates integrated with a piezoelectric *** the best of the authors’knowledge,this is the first time that the proposed approach is extended for study of the dynamic behavior of the smart viscoelastic *** utilized RPT which works for both thick and thin plates predicts a parabolic variation for transverse shear stresses across the plate *** a linear viscoelastic model for the substrate material,the relaxation module is predicted by the Prony *** Hamilton’s principle,the weak form equation is constructed and a four-node rectangular plate element is utilized for discretizing the *** Newmark scheme is employed for advancing the solution in time.A MATLAB code is developed based on the formulations and several benchmark problems are *** the findings with existing results in previous studies confirms the accuracy and efficiency of the proposed *** dynamic response of the smart viscoelastic plates under various electromechanical loads is investigated and the results show that *** can be passively controlled by adding and actuating the piezoelectric *** damping effects of viscoelastic parameters on the results are investigated,too.

关键词： Forced vibration Refined plate theory Viscoelastic material Piezoelectricity Smart structure Finite element method

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An improved displacement-based adaptive pushover procedure based on factor modal combination rule

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Earthquake Engineering and Engineering Vibration 2014年第2期13卷 223-241页

作者： Abbasnia R Tajik davoudi A Maddah M.M Department of Civil Engineering Iran University of Science and Technology

An accurate estimation of the applied load pattern is an essential component in each pushover procedure. Recently, a number of adaptive pushover methods have been proposed in which the effects of the higher modes as well as the progressive changes in the dynamic characteristics of structures are taken into account to compute the applied load pattern. The basic shortcoming of these advanced pushover methods is related to employing the quadratic modal combination rule, whereby the sign reversals of the modal load vectors are suppressed. In this study, an improved displacement-based adaptive pushover method is developed in which the applied load pattern is computed using the factor modal combination rule(FMC). In the proposed procedure, multiple load patterns, depending on the number of the modes considered, are determined in order to take into account the sign reversals of different modal load vectors. The accuracy of the proposed method is verifi ed for seven moment resisting frame buildings of 3, 9 and 20 stories with regularity or vertically geometric and mass irregularities subjected to 60 earthquake ground motion records. The results showed that the proposed methodology is capable of reproducing the peak dynamic responses with very good accuracy.

关键词： adaptive pushover higher modes sign reversal factor modal combination rule

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Design and optimization of nano-antenna for thermal ablation of liver cancer cells

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Chinese Physics B 2021年第4期30卷 574-585页

作者： Mohammad Javad Rabienejhad Azardokht Mazaheri Mahdi davoudi-Darareh Optics and Laser Science and Technology Research Center Malek Ashtar University of TechnologyShahinshahrIran Department of Physics University of IsfahanIran Faculty of Science Malek Ashtar University of TechnologyShahinshahrIran

One method of cancer therapy is to utilize nano-antenna for thermal *** this method,the electromagnetic waves emitted from the nano-antenna are absorbed by the tissue and lead to heating of cancer *** temperature of cancer cells reaches a threshold,they will begin to *** this purpose,an L-shaped frame nano-antenna(LSFNA) is designed to introduce into the biological ***,the radiation characteristics of the LSFNA such as near and far-field intensities,directivity,and sensitivity to its gap width are studied to the optimization of the *** bio-heat and Maxwell equations are solved using the finite element *** prevent damage to healthy tissues in this method,the antenna radiation must be completely controlled and performed ***,penetration depth,special absorption rate,temperature distribution,and the fraction of tissue necrosis are analyzed in the biological *** is why the design and optimization of the nano-antennas as a radiation source is ***,a pulsed source is used to excite the ***,focusing and efficiency of the nano-antenna radiation on the cancer cell is tuned using an adjustable liquid crystal *** focus of this lens is changing under an electric field applied to its surrounding cathode.

关键词： cancer therapy directivity far-field intensity hyperthermia liver cancer nano-antenna thermalablation tunable liquid crystal lens

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Modeling and numerical simulation of electrical and optical characteristics of a quantum dot light-emitting diode based on the hopping mobility model:Influence of quantum dot concentration

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Chinese Physics B 2022年第6期31卷 725-735页

作者： Pezhman Sheykholeslami-Nasab Mahdi davoudi-Darareh Mohammad Hassan Yousefi Faculty of Science Malek Ashtar University of TechnologyShahin-ShahrIran

We present a comprehensive numerical framework for the electrical and optical modeling and simulation of hybrid quantum dot light-emitting diodes(QD-LEDs).We propose a model known as hopping mobility to calculate the carrier mobility in the emissive organic layer doped with quantum dots(QDs).To evaluate the ability of this model to describe the electrical characteristics of QD-LEDs,the measured data of a fabricated QD-LED with different concentrations of QDs in the emissive layer were taken,and the corresponding calculations were performed based on the proposed *** simulation results indicate that the hopping mobility model can describe the concentration dependence of the electrical behavior of the ***,based on the continuity equation for singlet and triplet excitons,the exciton density profiles of the devices with different QD concentrations were ***,the corresponding luminance characteristics of the devices were calculated,where the results are in good agreement with the experimental data.

关键词： hybrid quantum dot light-emitting diode(QD-LED) concentration-dependent hopping mobility effective transport model Gaussian band structure

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A unified approach to output synchronization of heterogeneous multi-agent systems via L2-gain design

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Control Theory and Technology 2017年第4期15卷 340-353页

作者： Shan Zuo Yongduan Song Hamidreza Modares Frank L. Lewis Ali davoudi School of Automation Engineering University of Electronic Science and Technology of China Chengdu Sichuan China The University of Texas at Arlington Research Institute Fort Worth U.S.A.

In this paper, a unified design procedure is given for output synchronization of heterogeneous multi-agent systems （MAS） on communication graph topologies, using relative output measurements from neighbors. Three different control protocols, namely, full-state feedback, static output-feedback, and dynamic output-feedback, are designed for output synchronization. It is seen that a unified design procedure for heterogeneous MAS can be given by formulation and solution of a suitable local L2-gain design problem. Sufficient conditions are developed in terms of stabilizing the local agents＇ dynamics, satisfying a certain small-gain criterion, and solving the output regulator equations. Local design procedures are presented for each agent to guarantee that these sufficient conditions are satisfied. The proposed control protocols require only one copy of the leader＇s dynamics in the compensator, regardless of the dimensions of the outputs. This results in lower-dimensional compensators for systems with high-order outputs, compared to the p-copy internal model approach. All three proposed control protocols are verified using numerical simulations.

关键词： Heterogeneous systems output-feedback output synchronization small-gain theorem

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Justice and fairness in the city

Justice and fairness in the city

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作者： davoudi Simin Bell Derek

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Invasive aspergillosis in liver transplant recipients, an infectious complication with low incidence but significant mortality

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World Journal of Transplantation 2023年第5期13卷 264-275页

作者： Azam Farahani Fereshteh Ghiasvand Setareh davoudi Zahra Ahmadinejad Department of Infectious Diseases Imam Khomeini Hospital ComplexTehran University of Medical SciencesTehran ***Iran Liver Transplantation Research Center Imam Khomeini Hospital ComplexTehran University of Medical SciencesTehran ***Iran

BACKGROUND Infections,including invasive fungal infections(IFIs),are among the leading causes of mortality in liver transplant recipients during the first year *** To investigate the epidemiology,clinical manifestations,risk factors,treatment outcomes,and mortality rate of post-liver transplantation invasive aspergillosis(IA).METHODS In this case-control study,22 patients with IA were identified by reviewing the archived and electronic medical records of 850 patients who received liver transplants at the Imam Khomeini Hospital complex in Tehran,Iran,between 2014 and *** control group comprised 38 patients without IA infection matched for age and *** information obtained included the baseline characteristics of liver transplant patients,operative reports,post-transplantation characteristics of both groups and information about the fungal infection of the patient *** The prevalence rate of IA among liver transplant recipients at Imam Khomeini Hospital was 2.7%.The risk factors of IA among studied patients included high serum creatinine levels before and post-transplant,renal replacement therapy,antithymocyte globulin induction therapy,post-transplant bile leakage,posttransplant hepatic artery thrombosis,repeated surgery within 30 d after the transplant,bacterial pneumonia before the aspergillosis diagnosis,receiving systemic antibiotics before the aspergillus infection,cytomegalovirus infection,and duration of post-transplant hospitalization in the intensive care *** most prevalent form of infection was invasive pulmonary aspergillosis,and the most common chest computed tomography scan findings were nodules,pleural effusion,and the halo *** the case group,prophylactic antifungal therapy was administered more frequently than in the control *** antifungal therapy response rate at 12 wk was 63.7%.The 3-and 12-mo mortality rates of the patients with IA were 36.4%and 45.4%,respectively(compared with the mortality rate o

关键词： Aspergillosis Cytomegalovirus infection Immunosuppression therapy Liver transplantation Risk factors Fungal infections Fungal pneumonia

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Effect of insulin on Blattela germanica Linnacus

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Asian Pacific Journal of Tropical Biomedicine 2011年第4期1卷 285-288页

作者： Abolghasemi E Moosa Kazem SH Abolhasani M davoudi M Department of Medical Entomology and Vector Control School of Public HealthTehran University of Medical Sciences

Objective:To determine the sensitivity of Blattela germanica L(*** L) to differenct doses of ***:*** were reared in laboratory conditions at(25±2) ℃ and(50±5)%relative humidity(RH),and exposure period of 12:12 L/*** concentrations,viz.5,10,15,20 and 25 μ of insulin N,R,(N+R) were prepared and injected to 10 treated cockroaches with another 10 cockroaches which were injected with normal saline as control ***:Insulin N with a dose of 20 μ caused more than 70%mortality of *** in this *** was a significant difference between 20 μ of insulin N with other doses of 5,10,15 and 25 μ,and its comparison with other forms of medication also showed obvious difference(P<0.05).Conclusions:It can be concluded that effective drug doses of insulin which can be used as posion bait or gel against German cockroaches could be utilized in the control of *** in the future field studies.

关键词： Insulin Rearing Blattela germanica Insectary Sensitivity

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