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第十二届国际混凝土碱集料反应会议

作者： h.farzam S.Bryan Cemex USA 840 Gessner RoadSuite 1400HoustonTX77024 USA Cemex SA de CV Avenida Ricardo Margain Zozaya #325Colonia Valle de Campestre San Pedro Garza GarciaNuevo Leon 66265 Mexico

＜正＞ It is very important to understand ASR mechanisms. This will help to identify the key parameters that affect ASR reaction and expansion. It also can provide important information to be used in the selection pro... 详细信息

关键词： ASR fly ash autoclave mechanism calcium hydroxide.

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Wear and corrosion resistance and electroplating characteristics of electrodeposited Cr-SiC nano-composite coatings

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Transactions of Nonferrous Metals Society of China 2013年第7期23卷 1993-2001页

作者： M.Arab JUNEGhANI M.farzam h.ZOhDIRAD Abadan Faculty of Petroleum Engineering Petroleum University of TechnologyAbadanIran

Cr-SiC nanocomposite coatings with various contents of SiC nanoparticles were prepared by electrodeposition in optimized Cr plating bath containing different concentrations of SiC nanoparticles. Direct current electrocodeposition technique was used to deposit chromium layers with and without SiC nanoparticles on mild carbon steel. The effects of current density, stirring rate and concentration of nanoparticles in the plating bath were investigated. Scanning electron microscopy was used to study surface morphology. Energy dispersive analysis technique was used to verify the presence of SiC nanoparticles in the coated layers. The corrosion behaviors of coatings were investigated by potentiodynamic polarization and electrochemical impedance spectroscopy methods in 0.05 mol/L hCl, 1 mol/L NaOh and 3.5% NaCl （mass fraction）, respectively. Microhardness measurements and pin-on- disc tribometer technique were used to investigate the wear behavior of the coatings.

关键词： Cr-SiC nano-composite coatings electrocodeposition corrosion resistance wear behavior

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Tribo-charging of binary mixtures composed of coarse and fine particles in gas-solid pipe flow

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Particuology 2019年第2期17卷 101-109页

作者： haifeng Wang farzam Fotovat Xiaotao T. Bi John R. Grace Department of Chemical Engineering China University of Mining and Technology. Xuzliou 221166 China Department of Chemical and Petroleum Engineering Sharif University of Technology Azadi Avenue P.O. Box 11365-9465 Tehran Iran Fluidization Research Centre Department of Chemical and Biological Engineering University of British Columbia. Vancouver V6T 1Z3 Canada

Experiments were conducted to investigate the effect of adding fines on the tribo-charging of coarse glass beads. Four types of fines, i.e., copper, stainless steel, uncoated and silver-coated fine glass beads, mixed w让h 240-830 μm glass beads were conveyed by air through a stainless-steel spiral pipe acting as a tribo-charger. Regardless of the type or electrical conductivity of the fine particles tested, adding small amounts of fines (up to 10wt%) to coarse glass beads resulted in a sharp increase in the mass and surface charge densities of the particles. In gen eral, the profiles of the mass and surface charge den sides of the fine-coarse particle mixtures as a function of the mixture composition were determined by the relative magnitude of contact potential differences and the total surface areas of all the comp on ents. The domi nant particle tri bo-electrification mecha nism switched from coarse particle-wall con tacts to fine particle-wall contacts when the fines weight percentage in the mixture exceeded 10%. A model was developed to predict the mass charge density of bi nary mixtures as a function of the mixture composition.

关键词： Tribo-charging Electrostatics Fine particles Binary mixture Gas-solid flow

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New insights of helicobacter pylori host-pathogen interactions: The triangle of virulence factors, epigenetic modifications and non-coding RNAs

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World Journal of Clinical Cases 2018年第5期6卷 64-73页

作者： farzam Vaziri Samira Tarashi Abolfazl Fateh Seyed Davar Siadat Microbiology Research Center Pasteur Institute of Iran Department of Mycobacteriology and Pulmonary Research Pasteur Institute of Iran

helicobacter pylori(h. pylori) is a model organism for understanding host-pathogen interactions and infection-mediated carcinogenesis. Gastric cancer and h. pylori colonization indicates the strong correlation. The progression and exacerbation of h. pylori infection are influenced by some factors of pathogen and host. Several virulence factors involved in the proper adherence and attenuation of immune defense to contribute the risk of emerging gastric cancer, therefore analysis of them is very important. h. pylori also modulates inflammatory and autophagy process to intensify its pathogenicity. From the host regard, different genetic factors particularly affect the development of gastric cancer. Indeed, epigenetic modifications, Micro RNA and long non-coding RNA received more attention. Generally, various factors related to pathogen and host that modulate gastric cancer development in response to h. pylori need more attention due to develop an efficacious therapeutic intervention. Therefore, this paper will present a brief overview of host-pathogen interaction especially emphases on bacterial virulence factors, interruption of host cellular signaling, the role of epigenetic modifications and non-coding RNAs.

关键词： helicobacter pylori Epigenetic Virulence factor Non-coding RNAs host pathogen interactions

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Diversity of helicobacter pylori genotypes in Iranian patients with different gastroduodenal disorders

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World Journal of Gastroenterology 2013年第34期19卷 5685-5692页

作者： farzam Vaziri Shahin Najar Peerayeh Masoud Alebouyeh Tabassom Mirzaei Yoshio Yamaoka Mahsa Molaei Nader Maghsoudi Mohammad Reza Zali Department of Bacteriology Faculty of Medical SciencesTarbiat Modares University Gastroenterology and Liver Diseases Research Center Shahid Beheshti University of Medical Sciences Department of Environmental and Preventive-Medicine Oita University Faculty of Medicine Department of Medicine-Gastroenterology Baylor College of Medicine Basic and Molecular Epidemiology of Gastroin-testinal Disorders Research Center Shahid Beheshti University of Medical Sciences Neuroscience Research Center (NRC) Shahid Beheshti University of Medical Sciences

AIM:To investigate the diversity of helicobacter pylori(***)genotypes and correlations with disease outcomes in an Iranian population with different gastroduodenal ***:Isolates of *** from patients with different gastroduodenal disorders were analyzed after culture and identification by phenotypic and genotypic *** DNA was extracted with the QIAamp DNA mini kit(Qiagen,Germany).After DNA extraction,genotyping was done for cagA,vacA(s and m regions),iceA(iceA1,iceA2)and babA with specific primers for each allele using polymerase chain reaction(PCR).All patients’pathologic and clinical data and their relation with known genotypes were analyzed by using SPSS version 19.0 software.2test and Fisher’s exact test were used to assess relationships between categorical *** level of statistical significance was set at Ph different gastroduodenal disorders were *** on analysis of the cagA gene(positive or negative),vacA s-region(s1or s2),vacA m-region(m1or m2),iceA allelic type(iceA1and iceA2)and babA gene(positive or negative),twenty different genotypic combinations were *** prevalence of cagA,vacA s1,vacA s2,vacA m1,vacA m2,iceA1,iceA2,iceA1+iceA2and babA were 62%,78.9%,19.7%,21.1%,78.9%,15.5%,22.5%,40.8%and 95.8%,***,evaluation of PCR results for cagA in 6 patients showed simultaneous existence of cagA variants according to their size diversities that proposed mixed infection in these *** most prevalent genotype in cagA-positive isolates was cagA+/vacAs1m2/iceA1+A2/babA+and in cagA-negative isolates was cagA-/vacAs1m2/iceA-/babA+.There were no relationships between the studied genes and histo-pathological findings(*** density,neutrophil activity,lymphoid aggregation in lamina propria and glandular atrophy).The strains which carry cagA,vacAs1/m1,iceA2and babA genes showed significant associations with severe active c

关键词： helicobacter pylori cagA vacA iceA babA

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