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Structural Features of(Ce,La or Sr)(Mn or Co)O_3 NanoPerovskites as a Catalyst for Carbon Monoxide Oxidation

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Acta Metallurgica Sinica(English Letters) 2014年第4期27卷 635-641页

作者： mahnaz ghiasi Azim Malekzadeh School of Chemistry Damghan University

The collection of different cations in the A and B sites of ABO3 was explored for the regularity of perovskites phase ***,Sr2？,La3？,and Ce4？are selected as the cations of site *** site B is considered to be Mn or Co *** analysis and Fourier transform infrared spectroscopy results confirm the formation of perovskite structure for catalysts in which La3？and Sr2？are considered as the cations of site *** is detected as the main crystalline phase when Ce4？is selected to be cation of site *** is found that the octahedral factor（rB/rO） takes the same important role as the tolerance factor to form cubic *** crystallite size of the products was calculated by data of the XRD and measured by the TEM *** of the XRD and TEM studies were supported by the study of the particles size distribution,which was carried out in a particle size *** perovskite samples were also used for stoichiometric oxidation of carbon monoxide with air.

关键词： Carbon monoxide Nano-perovskite Oxidation Cerium Lanthanum Strontium

On the Zeros of a Special Class of Polynomials

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Journal of Mathematical Research with Applications 2024年第4期44卷 470-474页

作者： mahnaz Shafi CHISHTI Vipin Kumar TYAGI Mohammad Ibrahim MIR School of Basic and Applied Sciences Shobhit Institute of Engineering and Technology (Deemed to be University) Department of Mathematics University of KashmirSouth Campus

Let P be a complex polynomial of the form P （z）=（λz-a）mΠj=1n-m（z-zj）,where|zj|≥1,1≤j≤*** aim of this paper is to obtain generalisation of a result due to Zargar and Manzoor and a result due to Mir,Nazir and... 详细信息

关键词： bound coefficient polynomial zeros

环氧树脂涂层中添加含铝复合粉增强碳钢基材的防腐性

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Journal of Central South University 2024年第3期31卷 723-736页

作者： Meysam TOOZANDEHJANI Pooria MOOZARM NIA Ebrahim ABOUZARI LOTF Farhad OSTOVAN mahnaz SHAMSHIRSAZ New Technologies Research Center Amirkabir University of TechnologyTehran Polytechnic424 Hafez Ave.P.B.15875-4413TehranIran Section for Surface Physics and Catalysis Department of PhysicsTechnicFysikvejBygning 311Kongens LyngbyDK-2800Denmark Institute of Nanotechnology and Institute of Quantum Materials and Technology Karlsruhe Institute of TechnologyP.O.Box 364076021 KarlsruheGermany Department of Materials Science and Engineering Bandar Abbas BranchIslamic Azad UniversityBandar AbbasIran

采用电化学阻抗谱(EIS)和电位极化(Tafel)试验,研究了在环氧树脂涂层中添加含铝粉末以增强碳钢基材的防腐性,含铝粉末包括纯铝、Al/CNT、Al/Al_(2)O_(3)、Al/CNT/Al_(2)O_(3)。用球磨法合成含2 wt.%碳纳米管、2 wt.%氧化铝纳米颗粒的复... 详细信息

采用电化学阻抗谱(EIS)和电位极化(Tafel)试验,研究了在环氧树脂涂层中添加含铝粉末以增强碳钢基材的防腐性,含铝粉末包括纯铝、Al/CNT、Al/Al_(2)O_(3)、Al/CNT/Al_(2)O_(3)。用球磨法合成含2 wt.%碳纳米管、2 wt.%氧化铝纳米颗粒的复合粉末,然后以1 wt.%的浓度加入到环氧树脂涂层中。结果表明,由于环氧树脂复合涂层的防护性能增强,从而提高了其耐腐蚀性。研究还发现,Al/CNT/Al_(2)O_(3)复合添加剂的保护性能比其他添加剂更显著,因为其颗粒尺寸的减小和具有某些形状的颗粒,进一步减少了腐蚀环境通过涂层渗透的路径,避免了金属基底/涂层界面可能发生的反应。EP-Al/CNT/Al_(2)O_(3)保持了一次时间常数特性,并在整个暴露时间内表现出最高的阻抗和最强的稳定性。这些添加剂的存在增强了涂层,从而改善了涂层的屏障性能。

关键词：铝复合材料环氧树脂复合材料涂层腐蚀电化学阻抗图谱(EIS) Tafel极化

Microfacies models and sequence stratigraphic architecture of the Oligocene-Miocene Qom Formation, south of Qom City, Iran

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Geoscience Frontiers 2015年第4期6卷 593-604页

作者： mahnaz Amirshahkarami mahnaz Karavan Geology Department Faculty of Science Payame Noor University

The Oligocene-Miocene Qom Formation has different depositional models in the Central han, Sanandaj-Sirjan and Urunlieh-Dokhtar inagmatic arc provinces in han. The Kahak section of the Qom Formation in the Uiumieh-Dokhtar magmatic arc has been studied, in order to determinate its microfacies, depositional model and sequence stratigraphy. The textural analysis and faunal assemblages reveal ten microfacies. These microfacies are indicative of five depositional settings of open marine, patch reef, lagoon, tidal flat and beach of the inner and middle ramp. On the basis of the vertical succession architecture of depositional system tracts, four third-order sequences have been recognized in the Oligocene-Miocene Kahak succession of Qom Formation. Based on the correlation charts, the transgression of the Qom Sea started fiom the southeast and continued gradually towards the north. This resulted in widespread northward development of the lagoon paleoenvironment in the Aquitanian-Burdigalian stages. Also, the sequence stratigraphic model of the Oligocene Miocene Qom Formation has an architecture similar to those that have developed from Oligocene Miocene global sea level changes.

关键词： Rupelian-ChattianAquitanian- Burdigalian Paleoenvironment Sedimentary model Sequence stratigraphy

A facile and convenient approach for the one-pot synthesis of 2,4(1H,3H)-quinazolinediones

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Chinese Chemical Letters 2012年第4期23卷 431-433页

作者： mahnaz Sharafi-Kolkeshvandi Farzad Nikpour Department of Chemistry Faculty of SciencesUniversity of KurdistanP.O.Box 66315-416SanandajIran

A fast and efficient method is described for the one-pot synthesis of 2,4（1H,3H）-quinazolinediones by cyclization reaction of anthranilic acid derivatives with potassium cyanate and acetic acid in *** to high yields... 详细信息

关键词： Anthranilic acid Potassium cyanate Quinazolinediones Benzoylenurea Cyclization reaction

Application of a weakly compressible smoothed particle hydrodynamics multi-phase model to non-cohesive embankment breaching due to flow overtopping

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Frontiers of Structural and Civil Engineering 2018年第3期12卷 412-424页

作者： Rasoul MEMARZADEH Gholamabbas BARANI mahnaz GHAEINI-HESSAROEYEH Department of Civil Engineering Faculty of Engineering Shahid Bahonar University of Kerman Kerman Iran

The subject of present study is the application of mesh free Lagrangian two-dimensional non-cohesive sediment transport model applied to a two-phase flow over an initially trapezoidal-shaped sediment embankment. The governing equations of the present model are the Navier-Stocks equations solved using Weakly Compressible Smoothed Particle Hydrodynamics （WCSPH） method. To simulate the movement of sediment particles, the model considers a powerful two-part technique; when the sediment phase has rigid behavior, only the force term due to shear stress in the Navier-Stokes equations is used for simulation of sediment particles＇ movement. Otherwise, all the Navier-Stokes force terms are used for transport simulation of sediment particles. In the present model, the interactions between different phases are calculated automatically, even with considerable difference between the density and viscosity of phases. Validation of the model is performed using simulation of available laboratory experiments, and the comparison between computational results and experimental data shows that the model generally predicts well the flow propagation over movable beds, the induced sediment transport and bed changes, and temporal evolution of embankment breaching.

关键词： WCSPH method non-cohesive sediment transport rheological model two-part technique two-phase dam break

Hepatitis C virus and type 2 diabetes

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World Journal of Gastroenterology 2009年第13期15卷 1537-1547页

作者： Francesco Negro mahnaz Alaei Division of Gastroenterology Hepatology and Clinical PathologyUniversity Hospitals Division of Clinical Pathology University Hospitals

This review focuses on the relationship between hepatitis C virus(HCV) infection and glucose metabolism ***-sectional and longitudinal studies have shown that the chronic HCV infection is associated with an increased risk of developing insulin resistance(IR) and type 2 diabetes(T2D).The direct effect of HCV on the insulin signaling has been analyzed in experimental *** currently available data should be considered as preliminary,HCV seems to affect glucose metabolism via mechanisms that involve cellular pathways that have been implicated in the host innate immune *** and T2D not only accelerate the histological and clinical progression of chronic hepatitis C,but also reduce the early and sustained virological response to interferon-alpha-based ***,a detailed knowledge of the mechanisms underlying the HCV-associated glucose metabolism derangements is warranted,in order to improve the clinical management of chronic hepatitis C patients.

关键词： Hepatitis C Fibrosis Insulin resistance Insulin signaling Type 2 diabetes

Numerical modeling of sediment transport based on unsteady and steady flows by incompressible smoothed particle hydrodynamics method

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Journal of Hydrodynamics 2018年第5期30卷 928-942页

作者： Rasoul Memarzadeh Gholamabbas Barani mahnaz Ghaeini-Hessaroeyeh Department of Civil Engineering Faculty of Engineering Shahid Bahonar University of Kerman Department of Civil Engineering Faculty of Engineering Vali-e-Asr University of Rafsanjan

The purpose of the present paper is to introduce a simple two-part multi-phase model for the sediment transport problems based on the incompressible smoothed particle hydrodynamics（ISPH） method. The proposed model simulates the movement of sediment particles in two parts. The sediment particles are classified into three categories, including the motionless particles, moving particles behave like a rigid body, and moving particles with a pseudo fluid behavior. The criterion for the classification of sediment particles is the Bingham rheological model. Verification of the present model is performed by simulation of the dam break waves on movable beds with different conditions and the bed scouring under steady flow condition. Comparison of the present model results, the experimental data and available numerical results show that it has good ability to simulate flow pattern and sediment transport.

关键词： Sediment transport Bingham model dam break incompressible smoothed particle hydrodynamics (ISPH) method steady and unsteady flows two-part multi-phase model

Improved microwave-assisted catalyst-free synthesis of9-aryl-5,9-dihydropyrimido[4,5-d][1,2,4]triazolo[1,5-a]pyrimidine-6,8(4H,7H)-dione derivatives

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Chinese Chemical Letters 2015年第9期26卷 1065-1067页

作者： mahnaz Farahi Bahador Karami Zohreh Banaki Department of Chemistry Yasouj University

Agreen regioselective synthesis of some new and known 9-aryl-5,9-dihydropyrimido[4,5-d][l,2,4]triazolo[1,5-a]pyrimidine-6,8（4H,7H）-diones has been described via the microwave-assisted one-pot reaction of 3-amino-1H-1,2,4-triazoles,aromatic aldehydes and barbituric acids under solvent- and catalyst-free *** operationally simple procedure is less laborious and provides a better scope than previously reported procedures.

关键词： 9-Aryl-5 9-dihydropyrimido[4 5-d] [ 1 2 4]triazolo[1 5-a]pyrimidine- 6 8(4H 7H)-diones Barbituric acids 3-Amino- 1 H- 1 2 4-triazoles Aryl aldehydes Microwave-assisted synthesis