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Effect of ultrasonic irradiation on rheological properties of asphaltenic crude oils

Petroleum Science 2012年第1期9卷 82-88页

作者： MOUSAVI Seyed Mohammadreza ramazani ahmad NAJAFI Iman DAVACHI Seyed Mohammad Ultrasonic Research Group Chemical and Petroleum Engineering Department Sharif University of TechnologyAzadi Ave. Tehran Iran Chemical and Petroleum Engineering Department Sharif University of TechnologyAzadi Ave. Tehran Iran Ultrasonic Research Group Chemical and Petroleum Engineering Department Sharif University of Technology Azadi Ave. Tehran Iran Chemical and Petroleum Engineering Department Sharif University of Technology Azadi Ave. Tehran Iran

In this work, the rheological changes of several crude oil samples exposed to ultrasonic waves for different time intervals in addition to the effect of temperature on viscosity behavior of heavy crude oils were investigated using a series of steady shear flow and oscillatory tests. The colloidal structural evolutions of flocs in oil samples were illustrated by analysis of the size distribution of flocculated asphaltene particles （confocal microscopy tests）. The rheological investigations indicate that the ultrasonic irradiation dissolved heavy components in crude oil. After ultrasonic treatment, the Kouh-e-Mond crude oil was found to be pseudoplastic. In addition, confocal microscopy confirms that there was an optimum duration for ultrasonic irradiation, at which the viscosity and flocculation rate of asphaltenic crude oils reduced to the minimum values. The optimum was found to be approximately 40 min for the Kouh-e-Mond crude oil. Experimental results illustrate that the ultrasonic irradiation could disaggregate heavy colloid components in crude oil, and breakdown of asphaltene molecules would only occur in a specific time interval of irradiation. Also according to the temperature sweep test, the oil temperature rise caused by ultrasonic irradiation was not the main reason for theological changes of the crude oil and this alteration may be due to physical and chemical phenomena induced by sonication in crude oil.

关键词： Asphaltene ultrasonic technology pseudoplastic property viscoelastic property yield stress,flocculation time

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SIMULATION OF VISCOELASTIC FLUID FLOWS IN EXPANSION GEOMETRY USING FINITE VOLUME APPROACH

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Chinese Journal of Polymer Science 2013年第12期31卷 1599-1612页

作者： Morteza Azizi ahmad ramazani S.A Habib Etemadi M Ehsan Shirzaei S Department of Chemical and Petroleum Engineering Sharif University of Technology

The simulation results on viscoelastic fluid flows in sudden expansion geometry with different expansion ratios are presented. Oldroyd-B, linear Phan-Thien-Tanner （L-PTT） and Finitely Extensible Nonlinear Elastic （FENE-P） based constitutive equations were applied in two-dimensional Cartesian coordinates. The governing equations in transient and fully developed regions were solved using open source software called OpenFOAM. The flow patterns, including velocity profiles, shear stresses and first normal stress differences in some horizontal and vertical sections are illustrated. In addition, effects of the fluid type, flow dynamics and expansion ratio on the flow and vortex patterns in transient and fully developed regions are presented and discussed. The presented results show that existences of vortices cause the inverse velocity and negative stresses in expansion regions of the channel which increase with increment of expansion ratio and Weissenberg number （We）. Furthermore, some dead spaces can be observed at channel expansion regions close to the wall which are also increased. The results also show that at low We numbers all fluids show close behavior while at high We numbers the FENE-P fluid behavior shows high divergence from that of the two other fluids.

关键词： Expansion flow Simulation Finite Volume OpenFOAM Viscoelastic Fluids.

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An overview of carbon nanotubes role in heavy metals removal from wastewater

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Frontiers of Chemical Science and Engineering 2019年第2期13卷 274-295页

作者： Leila Ouni Ali ramazani Saeid Taghavi Fardood Department of Chemistry University of ZanjanZanjanIran

The scarcity of water, mainly in arid and semiarid areas of the world is exerting exceptional pressure on sources and necessitates offering satisfactory water for human and different uses. Water recycle/reuse has confirmed to be successful and promising in reliable water delivery. For that reason, attention is being paid to the effective treatment of alternative resources of water (other than fresh water) which includes seawater, storm water, wastewater (e.g., dealt with sewage water), and industrial wastewater. Carbon nanotubes (CNTs) are called the technology of 21st century. Nowadays CNTs have been widely used for adsorption of heavy metals from water/ wastewater due to their unique physical and chemical properties. This paper reviews some recent progress (from 2013 to 2018) in the application of CNTs for the adsorption of heavy metals in order to remove toxic pollutants from contaminated water. CNTs are expected to be a promising adsorbent in the future because of its high adsorption potential in comparison to many traditional adsorbents.

关键词： carbon nanotubes heavy metals removal water treatment

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Synthesis and Chemical Shifts Calculation of α-Acyloxycarboxamides Derived from Indane-1,2,3-trione by DFT and HF Methods

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Chinese Journal of Structural Chemistry 2012年第9期31卷 1346-1356页

作者： Hooriye Yahyaei Ali Reza Kazemizadeh Ali ramazani Department of Chemistry Zanjan BranchIslamic Azad UniversityP.O.Box 49195-467ZanjanIran

α-Acyloxycarboxamides are synthesized from three-component Passerini reaction between indane-1,2,3-trione, isocyanides, and thiophenecarboxylic acids in quantitative yields. The structures of the final products were confirmed by IR, 1H and 13C NMR spectroscopy, mass spectrometry, and elemental analysis. The B3LYP/HF calculations for computation of 1H and 13C NMR chemical shifts have been carried out for the title compounds at the 6-311＋G＊＊ and 6-311＋＋G＊＊ basis set levels within GIAO and CSGT approaches. Predicted 1H and 13C NMR che-mical shifts have been assigned and compared with experimental 1H and 13C NMR spectra and they are supported each other.

关键词： DFT HF NMR spectra Passerini reaction isocyanide

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Synthesis and Structural Characterization of Organophosphorus Ylide-1-(3-nitrophenyl)-2-(triphenyl phosphoranylidene)ethanone

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Chinese Journal of Structural Chemistry 2015年第3期34卷 373-378页

作者： ALIREZA Dadrass ALI ramazani ahmad Poursattar Marjani HOJJATOLLAH Rahchamani HASSAN Nasri Koureh ALI Souldozi SEPIDEH Samiee KATARZYNA lepokura TADEUSZ Lis Department of Chemistry Faculty of Science Urmia University Department of Chemistry Zanjan Branch Islamic Azad University Department of Chemistry Urmia Branch Islamic Azad University Department of Chemistry Faculty of Science Shahid Chamran University Faculty of Chemistry University of Wroc?aw

The title compound Ph3P=C（H）C（O）PhNO2 （L） has been prepared by the addition of triphenylphosphine in acetone as solvent to 2-bromo-1-（3,nitrophenyl）ethanone followed by the addition of alkaline solution of sodium hydroxide. The yellow crystals of the title ylide were grown in methanol/chloroform solution by drop method without stirring at room temperature. The solid state structure of ylide has been established by X-ray crystallography analysis. In the molecule of the title compound, the geometry around the P atom is nearly tetrahedral and the O atom is in synperiplanar orientation to the P atom. The nitrophenyl ring is twisted with respect to the plane of the carbonyl group through an angle of 36.6（1）°. The crystal （C26H20NO3P, Mr = 425.40） belongs to the monoclinic system, space group P21/n with a = 10.889（3）, b = 14.467（3）, e = 13.872（4）A, β = 103.08（3）°, V = 2128.6（10） A3, Z= 4, T= 100（2） K, R = 0.059 and wR = 0.163 for 3984 observed reflections with I〉 2σ（I）.

关键词： crystal structure, phosphorus yUde, 2-bromo-1-(3-nitrophenyl)ethanone,triphenylphosphine

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Morphometric discrimination between females of two isomorphic sand fly species, Phlebotomus caucasicus and Phlebotomus mongolensis(Diptera:Phlebotominae) in endemic and non-endemic foci of zoonotic cutaneous leishmaniasis in Iran

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Asian Pacific Journal of Tropical Medicine 2019年第4期12卷 153-162页

作者： Azad Absavaran Mehdi Mohebali Vahideh Moin-Vaziri Alireza Zahraei-ramazani Amir ahmad Akhavan Fariba Mozaffarian Sayena Rafizadeh Yavar Rassi Department of Medical Entomology and Vector control School of Public Health Tehran University of Medical Sciences Department of Medical Parasitology and Mycology School of Public Health Tehran University of Medical Sciences Department of Medical Parasitology and Mycology School of Medicine Shahid Beheshti University of Medical Sciences Insect Taxonomy Research Department Iranian Research Institute of Plant Protection Ministry of Health and Medical Education

Objective: To delineate reliable morphological characteristics for identifying and separating female Phlebotomus caucasicus and Phlebotomus mongolensis which exist sympatrically in the main foci of zoonotic cutaneous leishmaniasis in ***: Sand flies were collected using sticky trap papers from active colonies of rodent burrows installed from 16 catching sites. Morphometric measurements were analyzed of 87 Phlebotomus caucasicus and 156 Phlebotomus mongolensis. Univariate and multivariate analysis were carried out to determine significant morphometric variables for discrimination of the two species. Finally, seven morphological characteristics of 65 female Phlebotomus caucasicus and 124 female Phlebotomus mongolensis were ***: Univariate and multivariate analyses of 10 morphometric variables via Discriminant Function Analysis(DFA) and Principal Component Analysis(PCA) showed that five morphometric variables had an accuracy of 100% for discriminating female Phlebotomus caucasicus and Phlebotomus mongolensis. Moreover, PCA revealed that the five morphometric variables with the highest loadings separated these two species. Morphological studies on antennal flagellum(and its associated structures) and mouth-parts of female specimens demonstrated significant differences in several ***: The results show that morphological and morphometrical features can be used to discriminate two female isomorphic species, Phlebotomus caucasicus and Phlebotomus mongolensis accurately.

关键词： Leishmaniasis Phlebotomus caucasicus Phlebotomus mongolensis Morphometry Discriminant Functional Analysis Principal Component Analysis Iran

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Synthesis and Infrared Spectra Computation of Sterically Congested 2,2-Disubstituted Indane-1,3-dione Derivatives

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Chinese Journal of Structural Chemistry 2011年第4期30卷 568-574页

作者： Seyed Mohammad Shoaei Ali Reza Kazemizadeh Ali ramazani Department of Chemistry Islamic Azad UniversityZanjan Branch

Sterically congested 2,2-disubstituted indane-1,3-dione derivatives have been syn-thesized and characterized by 1H NMR,13C NMR,FT-IR and elemental *** B3LYP/HF calculations for computation of IR spectra have been carried out for the title compounds at the 6-31G and 6-311＋＋G basis set *** vibrational frequencies have been assigned and compared with the experimental FT-IR spectra and they are supported each other.

关键词： vibrational frequency DFT HF FT-IR spectra 2 2-disubstituted indane-1 3-dione isocyanide

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Salivary gland antigens of laboratory-bred Phlebotomus sergenti and their immunogenicity in human volunteers in laboratory condition

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Asian Pacific Journal of Tropical Medicine 2020年第1期13卷 17-23页

作者： Arshad Veysi ahmad Reza Mahmoudi Mohammad Reza Yaghoobi-Ershadi Mahmood Jeddi-Tehrani Yavar Rassi Alireza Zahraei-ramazani Nasibeh Hosseini-Vasoukolaei Daem Roshani Mahboubeh Fatemi Ali Khamesipour Amir ahmad Akhavan Zoonoses Research Center Research Institute for Health DevelopmentKurdistan University of Medical sciencesSanandajIran Department of Medical Entomology and Vector Control School of Public HealthTehran University of Medical SciencesTehranIran Immunology Research Center Institute of Immunology and Infectious DiseasesIran University of Medical SciencesTehranIran Monoclonal Antibody Research Center Avicenna Research InstituteACECRTehranIran Department of Medical Entomology and Vector Control Health Sciences Research CenterAddiction InstituteMazandaran University of Medical SciencesSariIran Social Determinants of Health Research Center Research Institute for Health DevelopmentKurdistan University of Medical SciencesSanandajIran Center for Research and Training in Skin Diseases and Leprosy Tehran University of Medical SciencesTehranIran

Objective:To investigate Phlebotomus(P.)sergenti Parrot,1917(Diptera:Psychodidae)salivary gland antigens and their immune response in ***:Human volunteers were exposed to sand flies’bites in the laboratory,and following each exposure the size of induration was *** mean protein concentration of salivary gland lysate and specific *** saliva IgG was *** fly salivary proteins were separated by SDS-PAGE and their immunoreactivity was examined by Western blotting ***:Individuals exposed to *** salivary gland lysate for 8 months showed both antibody and delayed type hypersensitivity responses,although exposure for one month did not provoke any immune *** trend of antibody fluctuated during the exposure time and dropped by the end of antigen *** mean protein content was(0.36±0.08)μg in each pair salivary *** gland lysate showed 11 to 12 major protein bands and 3 to 6 of them were ***:Our study showed that the salivary gland components of *** provoked both cellular and humoral immune responses in ***,there are some immunogenic proteins in *** saliva which could be subjected for further investigation as vector-based vaccine candidate/s against anthroponotic cutaneous leishmaniasis.

关键词： Phlebotomus sergenti Antibody response Delayed-type hypersensitivity Human Salivary gland antigen

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Pseudo four-component and regioselective synthesis of 4-amino-3,5-dicyano-6-arylphthalates using triethylamine catalyst

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Chinese Chemical Letters 2013年第6期24卷 497-499页

作者： Bagher Mohammadi Mansoor Shafieey Hamed Kazemi Ali ramazani Department of Chemistry Payame Noor University Departmen of Chemistry University of Zanjan

An efficient triethylamine-catalyzed synthesis of 4-amino-3,5-dicyano-6-arylphthalates is described.A one-pot,simple pseudo four-component reaction between arylaldehydes,dialkyl acetylenedicarboxylates, and twice as m... 详细信息

关键词： Multicomponent reactions Ring closure Triethylamine Catalysis Regioselective 4-Amino-3 5-dicyano-6-arylphthalates

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Phlebotomus(Adlerius) kabulensis(Diptera: Psychodidae) a new record sand fly species from Iran: Morphological and molecular aspects

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Asian Pacific Journal of Tropical Medicine 2018年第2期11卷 131-135页

作者： Alireza Zahraei-ramazani Abedin Saghafipour Yavar Rassi Department of Medical Entomology School of Public HealthTehran University of Medical Sciences Department of Public Health Faculty of HealthQom University of Medical Sciences

Objective: To represent a new geographical record, Phlebotomus(Adlerius) kabulensis(***), which is suspected to be a potential vector of visceral ***: For the first time, *** specimens were collected using the sticky paper traps method in outdoor places in mountainous areas with vegetation coverage of three provinces in *** of males was based on ecological, morphological, morphometric and molecular(mtDNA cytochrome b gene sequences) ***, males have two ascoids on the 8^(th)antennal segment and one ascoid on segments 9^(th)to 15^(th), aedeagus with normal obtuseangled sub-terminal notch and coxite with 27–50 groups of hairs on the distal half of its ***: Morphometric measurement revealed that *** specimens were the same as compared with seven other morphological characters in three provinces of the country but lengths of the coxite were significantly *** PCR result of the cytochrome b(Cyt b)-mtDNA fragment shows 550-bp length, with its special nucleotide *** male and female of *** were newly discovered members of the subgenus Adlerius from *** DNA analysis indicated how distinct this species ***: The results show that the *** female will be identified by comparing with other Adlerius female groups regarding its morphometric characters and molecular sequencing.

关键词： Phlebotomus(Adlerius) kabulensis New geographical record Morphometric mtDNA cytochrome b gene

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