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| 1 | Structure Stability and Oxygen Permeability of Perovskite-type Oxides of Ba_(0.5)Sr_(0.5)Co_(0.8)Fe_(0.1)R_(0.1)O_ (3-δ)(R=Al,Mn,Fe,Ce,Cr,Ni,Co)显示文摘Perovskite-type Ba 0.5 Sr 0.5 Co 0.8 Fe 0.1 R 0.1 O 3 δ (R=Al,Mn,Fe,Ce,Cr,Ni,Co) oxide membranes were exploited and synthesized.Oxygen behavior,order-disorder transition and phase stability of these composite oxides were investigated by combined analysis of X-ray diffraction (XRD),temperature programmed desorption (TPD),thermogravimetric-differential thermal analysis (TG-DTA).Oxygen permeation through these membranes was studied by the gas chromatography (GC) method using a high-temperature permeation cell in a wide temperature range from 700 to 950 C.High permeation fluxes were observed for these materials.The high permeation flux was about 3.19 ml·min 1 ·cm 2 under air/He gradients at 950 C,which was achieved for Ba 0.5 Sr 0.5 Co 0.8 Fe 0.1 Ni 0.1 O 3 δ (BSCFNiO) membrane.The results of analysis showed no phase transition for BSCFNiO oxide with increasing temperature and XRD pattern of this material after O 2-TPD indicated to sustain a pure perovskite structure after oxygen permeation process. | Ensieh Ganji Babakhani Jafar Towfighi Laleh Shirazi Ali Nakhaeipour Akbar Zamaniyan Zahra Shafiei | 2012 | Journal of Materials Science & Technology2012，28，2： | 4 |
| 2 | 粉末冶金和微波烧结法制备Al−CNTs−Al2O3纳米复合材料的工艺−显微组织−性能之间的关系显示文摘采用粉末冶金和微波烧结工艺制备Al−2CNTs−xAl2O3纳米复合材料。研究工艺引起的显微组织特征与材料的物理、力学性能以及超声参数之间的相互关系。研究发现,复合材料的致密化和尺寸变化等物理性能与纳米复合粉体的形貌和粒径密切相关。当Al2O3含量为10%(质量分数)、球磨时间大于8 h、颗粒被大量细化时,材料的密度最大。Al2O3含量、纳米强化相的分布和晶粒尺寸对材料的力学性能有显著影响,当Al2O3含量为10%(质量分数)、Al2O3纳米颗粒球磨时间为12 h、碳纳米管均匀分布时,可形成高密度位错和大量晶粒细化,从而获得最佳的硬度和强度。同时,纵波和横波速度及衰减随着Al2O3含量和球磨时间的增加而线性增加。超声速度和衰减的变化取决于碳纳米管和Al2O3在基体中分布的均匀程度及其较小的颗粒间距。经过较长的球磨时间,Al2O3含量越高,碳纳米管和Al2O3分布越均匀,超声波的速度和衰减越大。 | Meysam TOOZANDEHJANI Farhad OSTOVAN Khairur Rijal JAMALUDIN Astuty AMRIN Khamirul Amin MATORI Ehsan SHAFIEI | 2020 | Transactions of Nonferrous Metals Society of China2020，30，9： | 4 |
| 3 | In-vitro bioactivity evaluation and physical properties of an epoxy-based dental sealer reinforced with synthesized fluorine-substituted hydroxyapatite, hydroxyapatite and bioactive glass nanofillers显示文摘The purpose of this study was to evaluate the physical properties and bioactivity potential of epoxy-based dental sealers modified with synthesized bioactive glass(BAG),hydroxyapatite(HA)and fluorine substituted hydroxyapatite(FHA)nanoparticles.The synthesized powders were incorporated at 10%and 20%into the epoxy-based dental sealer.The setting time,flow and solubility and microhardness of the modified and unmodified samples were examined.The bioactivity was evaluated using FESEM-EDX and elemental mapping,ATR-FTIR and XRD.The flow value of all of the experimental groups except the FHA modified samples,was greater than 20 mm.Concerning solubility,no specimens exhibited more than 1%weight loss.The solubility value of the FHA groups was statistically significant lower than other groups(p≤0.001).The mean hardness values of all of the modified samples were significantly higher than the unmodified group(p≤0.001).Regarding bioactivity,in vitro study revealed that after 3 days immersion in SBF a compact and continuous calcium phosphate layer formed on the surface of epoxy sealers containing BAG and HA nanoparticles.Based on these results,the addition of BAG and HA nanoparticles did not adversely alter the physical properties of epoxy sealers.Additionally,they improved the in vitro bioactivity of the epoxy sealer. | Bahaa Abdulrazzaq Jerri Al-Bakhsh Farhad Shafiei Atieh Hashemian Kiana Shekofteh Behnam Bolhari Marjan Behroozibakhsh | 2019 | Bioactive Materials2019，4，1： | 3 |
| 4 | DYNAMICS OF KNOWLEDGE ACCUMULATION IN TECHNOLOGY FOLLOWER COUNTRIES: A SYSTEM DYNAMICS APPROACH显示文摘In this paper the process of knowledge accumulation for a particular technology is studied. Two countries, say the technology follower and the technology frontier, are considered. The frontier’s knowledge growth is determined by its R&D efforts on the technology. The level of knowledge stock for the follower country is augmented by its R&D activities for the technology and absorbing some of the external knowledge through spillover from the frontier. The extent to which the follower is able to exploit the external knowledge depends on technological gap, absorptive capacity, absorption time and degree of spillover. New concepts such as natural and enhanced degree of spillover, background and innovative knowledge and absorption speed are introduced in the present work to deeply explore the process of knowledge spillover. The factors influencing the knowledge development in the long term are simultaneously studied in an integrated structure provided by the System Dynamics approach. This framework shows the responses to the changes and provides the basis for examining the interactions among the variables over time. | Ehsan SHAFIEI Mohammad-Bagher GHOFRANI Yadollah SABOOHI | 2009 | Journal of Systems Science and Systems Engineering2009，18，3： | 3 |
| 5 | Spironolactone in preventing hypokalemia following traumatic brain injury显示文摘 | Saeid Abrishamkar Mehdi Shafiei Mohammad Shafiei | 2010 | Chinese Journal of Traumatology2010，13，6： | 2 |
| 6 | An investigation into the effects of lime on compressive and shear strength characteristics of fiber-reinforced clays显示文摘To meet the ever-increasing construction demands around the world during recent years,reinforcement and stabilization methods have been widely used by geotechnical engineers to improve the performances and behavior of fine-grained soils.Although lime stabilization increases the compressive strength of soils,it reduces the soil ductility at the same time.Recent research shows that random fiber inclusion modifies the brittleness of soils.In the current research,the effects of lime and polypropylene(PP)fiber additions on such characteristics as compressive and shear strengths,failure strain,secant modulus of elasticity(E50)and shear strength parameters of mixtures were investigated.Kaolinite was treated with 1%,3% and 5% lime by dry weight of soil and reinforced with 0.1% monovalent PP fibers with the length of 6 mm.Samples were prepared at optimum conditions and cured at 35℃ for 1 d,7 d and 28 d at 90% relative humidity and subsequently subjected to uniaxial and triaxial compression tests(UCT and TCT)under cell pressures of 25 kPa,50 kPa and 100 kPa.Results showed that inclusion of random PP fibers to clay-lime mixtures increases both compressive and shear strengths as well as the ductility.Lime content and curing period were found to be the most influential factors.Scanning electron microscopy(SEM)analysis showed that lime addition and the formation of cementitious compounds bind soil particles and increase soil/fiber interactions at interface,leading to enhanced shear strength.The more ductile the stabilized and reinforced composition,the less the cracks in roads and waste landfill covers. | Mahmood Reza Abdi Abbas Ghalandarzadeh Leila Shafiei Chafi | 2021 | Journal of Rock Mechanics and Geotechnical Engineering2021，13，4： | 2 |
| 7 | Effect of exogenous keratinocyte growth factor on corneal epithelial migration after photorefractive keratectomy显示文摘 | Rajan M S Shafiei S Mohrenfels C V | 2004 | J Cataract Refract Stag2004，30，10： | 1 |
| 8 | Lead isotope signatures of the igneous rocks and por- phyry copper deposits from the Kerman Cenozoic magmatic arc (SE Iran),and their magmatic-metallogenetic implications 显示文摘 | Shafiei B | 2010 | Ore Geology Reviews2010，38，1： | 1 |
| 9 | Preoperative ^99m Tc-ses- tamibi scintigraphy in patients with primary hyperparathyroidism and concomitant nodular goiter: comparison of SPECT-CT, SPECT, and planar imaging显示文摘 | Shafiei B Hoseinzadeh S Fotouhi F | 2012 | Nucl Med Commun2012，33，10： | 1 |
| 10 | Artifacts from den- tal casting alloys in magnetic resonance imaging显示文摘 | Shafiei F Honda E Takahashi H | 2003 | J Dent Res2003，82，8： | 1 |
| 11 | Histochemical assessment of nitric oxide synthase activity in aortic endothelial cells of streptozotocin-induced diabetic rats显示文摘 | Shafiei M Nobakht M Fattahi M | 2003 | Pathophysiology2003，10，1： | 1 |
| 12 | Studies on the synthesis of A1203 nanopowders by the polyacrylamide gel method显示文摘 | Tahmasebpour M Babaluo AA Shafiei S | 2009 | Powder Technology2009，，191： | 1 |
| 13 | Quality of life and sexual functioning in young women with early-stage breast cancer 1 year after lumpeetomy 显示文摘 | Safarinejad MR Shafiei N Safarinejad S | 2013 | Psychooncology2013，22，6： | 1 |
| 14 | Histochemical assessment of nitric oxide synthase activity in aortic endothelial cells of streptozotocin-induced diabetic rats显示文摘 | Shafiei M Nobakht M Fattahi M | 2003 | Pathophysiology2003，10，1： | 1 |
| 15 | Association of genetic polymorphism of glutathione S-transferase(GSTM1,GSTT1,GSTP1)with bladder cancer susceptibility显示文摘 | Safarinejad MR Safarinejad S Shafiei N | 2013 | Urol Oncol2013，31，7： | 1 |
| 16 | Human platelet rich plasma plus Persian Gulf coral effects on experimental bone healing in rabbit model: radiological, histological, maeroseopical and biomechanical evaluation 显示文摘 | Parizi AM Oryan A Shafiei - Sarvestani Z | 2012 | J Mater Sci Mater Med2012，23，2： | 1 |
| 17 | A study of the devel- opment of micro- cracks in surface/near surface of aluminum- manganese alloys during hot roiling 显示文摘 | GALI O A SHAFIEI M HUNTER J A | 2015 | Materials Science and Engineering:A2015，，627： | 1 |
| 18 | Partial stabilization-based guidance 显示文摘 | Shafiei M H Binazadeh T | 2012 | ISA Transactions2012，51，4： | 1 |
| 19 | Characterization of variations in PB2, NS1, M, neuraminidase and hemagglutinin of influenza A (H3N2) viruses in Iran显示文摘 | Yavarian J Shafiei Jandaghi NZ Naseri M | 2014 | Jundishapur J Mierobiol2014，7，3： | 1 |
| 20 | Application of partial sliding mode in guidance problem 显示文摘 | Shafiei M H Binazadeh T | 2013 | ISA Transactions2013，52，2： | 1 |
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