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Comparing the deactivation behaviour of Co/CNT and Co/γ-Al_2O_3 nano catalysts in Fischer-Tropsch synthesis

Journal of Natural Gas Chemistry 2012年第5期21卷 605-613页

作者： Ahmad Tavasoli Saba Karimi Somayeh Taghavi Zahra Zolfaghari hamideh amirfirouzkouhi School of Chemistry College of ScienceUniversity of TehranTehranIran

An extensive study of Fischer-Tropsch （FT） synthesis on cobalt nano particles supported on γ-alumina and carbon nanotubes （CNTs） catalysts is reported.20 wt% of cobalt is loaded on the supports by impregnation *** deactivation of the two catalysts was studied at 220 C,2 MPa and 2.7 L/h feed flow rate using a fixed bed *** calcined fresh and used catalysts were characterized extensively and different sources of catalyst deactivation were *** of cobalt-support mixed oxides in the form of xCoO yAl2O3 and cobalt aluminates formation were the main sources of the Co/γ-Al2O3 catalyst *** sintering and cluster growth of cobalt nano particles are the main sources of the Co/CNTs catalyst *** the case of the Co/γ-Al2O3 catalyst,after 720 h on stream of continuous FT synthesis the average cobalt nano particles diameter increased from 15.9 to 18.4 nm,whereas,under the same reaction conditions the average cobalt nano particles diameter of the Co/CNTs increased from 11.2 to 17.8 ***,the initial FT activity of the Co/CNTs was 26% higher than that of the Co/γ-Al2O3,the FT activity over the Co/CNTs after 720 h on stream decreased by 49% and that over the Co/γ-Al2O3 by 32%.For the Co/γ-Al2O3 catalyst 6.7% of total activity loss and for the Co/CNTs catalyst 11.6% of total activity loss cannot be recovered after regeneration of the catalyst at the same conditions of the first regeneration *** is concluded that using CNTs as cobalt catalyst support is beneficial in carbon utilization as compared to γ-Al2O3 support,but the Co/CNTs catalyst is more susceptible for deactivation.

关键词： Fischer-Tropsch synthesis cobalt carbon nanotube γ-alumina deactivation

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Stem cell transplantation in cerebrovascular accidents:A global bibliometric analysis(2000-2023)

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World Journal of Stem Cells 2024年第9期16卷 832-841页

作者： Jad El Masri Ahmad Afyouni Maya Ghazi Karim hamideh Israe Moubayed Abdo Jurjus Hanine Haidar Ruzanna Petrosyan Pascale Salameh Hassan Hosseini École Doctorale Sciences de la Vie et de la Santé UniversitéParis-Est CréteilCréteil 94010France INSERM U955-E01 Institut Mondor de Recherche BiomédicaleUniversitéParis-Est CréteilCréteil 94000France Faculty of Medical Sciences Lebanese UniversityBeirut 1533Lebanon Department of Anatomy Cell Biology and Physiological SciencesFaculty of MedicineAmerican University of BeirutBeirut 1107Lebanon Department of Neurology Faculty of MedicineLebanese American UniversityBeirut 1102Lebanon Department of Pathology Faculty of MedicineLebanese American UniversityBeirut 1102Lebanon Faculty of Pharmacy Lebanese UniversityBeirut 1102Lebanon Faculty of Medicine Lebanese American UniversityBeirut 1102Lebanon Department of Primary Care and Population Health University of Nicosia Medical SchoolNicosia 2408Cyprus Institut National de SantéPublique d'Épidémiologie Clinique et de Toxicologie-Liban Beirut 1103Lebanon Department of Neurology Henri Mondor HospitalAP-HPCréteil 94000France

BACKGROUND Cerebrovascular accident(CVA)is a major global contributor to death and *** part of its medical management,researchers have recognized the importance of promising neuroprotective strategies,where stem cell transplantation(SCT)is thought to confer advantages via trophic and neuroprotective *** To evaluate the current state of research on SCT in patients with CVA,assess key trends and highlight literature *** PubMed was screened for SCT in CVA-related articles in October 2023,for each country during the period between 2000 and *** the World Bank data,total population and gross domestic product were collected for ***_1.6.19 was used to create the VOS figure using the results of the same *** and tables were obtained using Microsoft Office *** A total of 6923 studies were identified on SCT in CVA,making 0.03%of all published studies ***,68%were conducted in high-income countries,with a significant focus on mesenchymal stem *** journal“Stroke”featured the largest share of these articles,with mesenchymal SCT having the highest rate of inclusion,followed by hematopoietic *** time,there has been a noticeable shift from in vitro studies,which assess stem cell proliferation and neurogenesis,to in vivo studies aimed at evaluating efficacy and ***,the number of reviews increased along this *** This bibliometric analysis provides a comprehensive guide for physicians and researchers in the field through an objective overview of research activity,and highlights both current trends and *** a potential therapeutic role in CVA,more research is needed in the future to focus on different aspects of SCT,aiming to reach a better treatment strategy and improve life quality in patients.

关键词： Bibliometric analysis PubMed Stem cell transplantation Cerebrovascular accidents Stroke

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Factors influencing dissolution of carbonaceous materials in liquid Fe-Mn

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Journal of Iron and Steel Research International 2020年第10期27卷 1153-1162页

作者： hamideh Kaffash Merete Tangstad Department of Materials Science and Engineering Norwegian University of Science and TechnologyAlfred Getz vei 2Trondheim 7491Norway

Carbon dissolution from four types of metallurgical cokes and graphite was investigated by using immersion rods in a resistance furnace to clarify the influence of factors governing the rate of carbon dissolution from carbonaceous materials into Fe-Mn melts at 1550℃.The factors studied were the nmicrostructure of carbonaceous materials,roughness,porosity and the wettability between carbonaceous materials and the ***/metal in terface was characterised by sea nning electron microscopy accompanied with energy-dispersive X-ray spectrometry to investigate the form at io n of an ash *** results showed that coke E had the highest dissolution *** roughness and porosity of the carbonaceous materials seemed to be dominant factors affecting the dissolution ***,crystallite size did not have a significant effect on the dissolution ***/liquid wettability seemed to affect the initial stage of dissolution *** dissolution mechanism was found to be both mass transfer and interfacial reactions.

关键词： Dissolution rate Carbonaceous material-Wettability Fe-Mn Carbon dissolution

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Calculation of the structural properties of asymmetrical nuclear matter

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Research in Astronomy and Astrophysics 2012年第3期12卷 345-358页

作者： Gholam Hossein Bordbar hamideh Nadgaran Department of Physics Shiraz University Research Institute for Astronomy and Astrophysics of Maragha

The structural properties of asymmetrical nuclear matter have been calculated,employing the AV 18 potential for different values of proton to neutron *** calculations have also been made for the case of symmetrical nuclear matter with the UV14,AV14 and AV 18 *** our calculations,we used the lowest order constrained variational method to compute the correlation function of the system.

关键词： stars:neutron—dense matter—equation of state

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Influence of bean rhizosphere on the biological properties and phosphorus fractionation in the calcareous soils amended with municipal sewage sludge

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Journal of Arid Land 2015年第5期7卷 644-652页

作者： Tahereh RAIESI Alireza HOSSEINPUR hamideh RAIESI Horticultural Science Research Institute Citrus and Subtropical Fruit Research Center Agricultural Research and Education Organization (AREO) Department of Soil Science College of Agriculture Shahrekord University Department of Plant Protection College of Agriculture Guilan University

The biological and chemical conditions of the rhizosphere are known to considerably differ from those of the bulk soil, as a consequence of a range of processes that are induced either directly by the activity of plant roots or indirectly by the stimulation of microbial population and activity in the rhizosphere. Information about phosphorus （P） fractionation in the rhizosphere soils amended with municipal sewage sludge （MSS） is limited, were We carried out greenhouse experiments using a rhizobox in order to evaluate the effects of bean rhizosphere on the various inorganic P （Pi） fractions, organic P （Po）, P in particulate fraction （PF-P）, Olsen-P, dissolved organic C （DOC）, microbial biomass P （MBP） and alkaline phosphatase （ALP） enzyme in 10 calcareous soils amended with MSS （10 g MSS was added to 1 kg soil）. Non-occluded P, occluded P, calcium phosphate and residual P were also quantitated. The results showed that DOC, MBP and ALP activity strongly increased and PF-P and Olsen-P de- creased in the rhizosphere soils compared with in the bulk soils （P〈0.05）. The contents of non-occluded P, oc- cluded P and residuaI-P fractions in the rhizosphere soils were lower than in the bulk soils, while the contents of calcium phosphate and organic P in the rhizosphere soils were higher than in the bulk soils. Simple correlation coefficients showed that P uptake had positive relationship with non-occluded P, occluded P, calcium phosphate fractions and PF-P in the rhizosphere soils. The results suggest that the short-term application of MSS to the cal- careous soils may increase Po and calcium phosphate fractions in the rhizosphere soils, and calcium phosphate fraction is potentially available to crops.

关键词： biological properties mineral phosphorus organic phosphorus semi-arid land

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Synthesis, characterization and antimicrobial activity of alkaline ion-exchanged ZnO/bentonite nanocomposites

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Journal of Central South University 2016年第4期23卷 787-792页

作者： hamideh Pouraboulghasem Mohammad Ghorbanpour Razieh Shayegh Samaneh Lotfiman Department of Food Science Islamic Azad University-Sarab Branch Sarab Iran Chemical Engineering Department University of Mohaghegh Ardabili Ardabil Iran

Nanocomposites of zinc/bentonite clay were synthesized for use as an antibacterial material by a quick and simple alkaline ion exchange method. The synthesis of zinc doped bentonite nanocomposite was accomplished by placing bentonite in a melting bath of ZnSO4 for 10, 20, 40, 60 and 90 rain. The complexes were characterized by XRD, SEM and DRS. XRD analyses and SEM observations confirmed the diffusion of zinc to the clay surfaces. Antibacterial activity tests against Escherichia coli showed that bentonite did not present any antibacterial properties, but after alkaline ion exchange treatment, inhibition was noted. The highest antibacterial activity was observed with ZnO/bentonite composite alkaline ion exchange for 60 and 90 rain. Interestingly, the leaching test indicated that ZnO/bentonite did not present any risk for drinking water treatment.

关键词： alkaline ion exchange ZnO/bentonite nanocomposite antibacterial activity

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Broadband absorption enhancement in hole-transport-layer-free perovskite solar cell by grating structure

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Optoelectronics Letters 2023年第10期19卷 587-592页

作者： hamideh Talebi Farzin Emami Esmat Rafiee Nano-Optoelectronic Research Center Electronic DepartmentShiraz University of TechnologyShirazIran Department of Electrical Engineering Faculty of EngineeringAlzahra UniversityTehranIran

Recently,the hole transport layer-free planar perovskite solar cells(HTL-free PSCs)have attracted intense ***,the poor absorption of light in the wavelengths longer than 800 nm is an important challenge in all configurations of *** this study,the HTL-free PSC with a gold rectangular grating at back contact is *** order to improve the performance of the solar cell,effects of grating dimensions and periodicity on the absorption of the active layer are numerically *** the improved condition,an absorption enhancement of 25%in the range of 300–1400 nm is obtained compared with the flat electrode-based *** improvements are attributed to the coupling of light to surface plasmon polariton(SPP)***,the electrical simulation results of the improved solar cell demonstrated short-circuit current density and power conversion efficiency of 27.72 mA/cm2 and 18%,respectively.

关键词： absorption layer free

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Mild and Efficient Synthesis of 1-（6-Chloroquinoxalin-2-yl）-2- [4-（trifluoromethyl）-2,6-dinitrophenyl] Hydrazine Derivatives by Microwave Irradiation

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Chemical Research in Chinese Universities 2014年第3期30卷 405-408页

作者： MILAD Taheri HANIYEH Alavi hamideh Nazari Department of Chemistry Islamic Azad University Tehran 14735/334 Iran

Some 1-（6-chloroquinoxalin-2-yl）-2-[4-（trifluoromethyl）-2,6-dinitrophenyl] hydrazine derivatives have been synthesized via both conventional and microwave assisted organic synthesis（MAOS） methods. The MAOS method is more effective on synthesizing these compounds than the conventional method in regard to the higher chemical yields of products（76%-98%） and the shorter reaction time（1-15 min）.

关键词： 2,6-Dichloroquinoxaline 2-Chloro-1-3-dinitro-5-triflouromthylbenzene hydrazine hydrate Methyl hydrazine Microwave assistant organic synthesis(MAOS)

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Simulation of particles settling in power-law fluids by combined lattice Boltzmann-smoothed profile methods

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International Journal of Sediment Research 2021年第5期36卷 637-655页

作者： hamideh Rouhani Tazangi Ataallah Soltani Goharrizi Ebrahim Jahanshahi Javaran Department of Chemical Engineering Shahid Bahonar University of Kerman Department of Mechanical Engineering Shahid Bahonar University of Kerman

In the current study, the settling, interaction, drafting, kissing, and tumbling of two identical and nonidentical circular particles were simulated in a two-dimensional box in shear-thinning, Newtonian,and shear-thickening fluids by using the combined lattice Boltzmann-smoothed profile ***, the drag coefficient of one particle settling for different power-law indexes and Archimedes numbers was calculated. Also, the effect of the diameter ratio of the two particle pairs was considered during settling. The developed method was validated by simulating the settling of one particle and two identical particles in a Newtonian fluid. To consider two non-identical particles, two cases were examined. In Case A, the larger particle was above the smaller one and in the Case B, the smaller particle was above the larger one. The results showed that the two non-identical particles were separated more easily than the identical ones. In the settling of two particles under the same Archimedes number, the drafting and kissing time considerably increased by changing the non-Newtonian fluid behavior from a shearthinning one to a shear-thickening one. Also, when the larger particle was above the smaller one, the time duration of the kissing stage increased with the decrease in the diameter ratio.

关键词： Lattice Boltzmann method Smoothed profile method DKT phenomenon Power-law fluids Particulate flow Drag coefficient

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An environmentally friendly synthesis of 1,4-dihydropyrano[2,3-c]pyrazole derivatives catalyzed by tungstate sulfuric acid

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Chinese Chemical Letters 2014年第12期25卷 1580-1582页

作者： Mahnaz Farahi Bahador Karami Iman Sedighimehr hamideh Mohamadi Tanuraghaj Department of Chemistry Yasouj UniversityYasouj 75918-74831Iran

An efficient three-component synthesis of 6-amino-4-aryl-5-cyano-3-metriyl-1-phenyl-1,4-dihydropyrano[2,3-c]pyrazoles via a reaction between 3-methyl-1-phenyl-2-pyrazolin-5-one,aromatic aldehydes and malononitrile using tungstate sulfuric acid as a catalyst was *** conditions,good to excellent yields,easily available catalyst and easy work-up are the key features of this method.

关键词： 6-Amino-4-aryl-5-cyano-3-methyl-1phenyl-1 4-dihydropyrano[2.3-c]pyrazoles 3-Methyl-1-phenyl-2-pyrazolin-5-one Aromatic aldehyde Malononitrile Tungstate sulfuric acid

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