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- 저자 : Molaei, Mehdi (검색결과 25 건)
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A simple one Step Thermochemical Approach for Synthesis of ZnS:Mn Nanocrystals (NCs)
Molaei, Mehdi,Lotfiani, Ahmad,Karimimaskon, Fatemeh,Karimipour, Masoud,Khanzadeh, Mohammd The Institute of Electronics and Information Engin 2014 Journal of semiconductor technology and science Vol.14 No.1
In this work we have synthesized ZnS:Mn nanocrystals (NCs) using a simple one step thermochemical method. $Zn(NO_3)_2$ and $Na_2S_2O_3$ were used as the precursors and $Mn(NO_3)_2$ was the source of impurity. Thioglycolic acid (TGA) was used as the capping agent and the catalyst of the reaction. The structure and optical property of the NCs were characterized by means of X- ray diffraction (XRD), HRTEM, UV-visible optical spectroscopy and photoluminescence (PL). X-ray diffraction (XRD) and transmission electron microscopy (TEM) analyses demonstrated cubic phase ZnS:Mn NCs with an average size around 3 nm. Synthesized NCs exhibited band gap of about 4 eV. Photoluminescence spectra showed a yellow-orange emission with a peak located at 585 nm, demonstrating the Mn incorporation inside the ZnS particles.
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Sedigheh Molaei,Mehryar Habibi Roudkenar,Fatemeh Amiri,Mozhgan Dehghan Harati,Marzie Bahadori,Fatemeh Jaleh,Mohammad Ali Jalili,Amaneh Mohammadi Roushandeh 대한혈액학회 2015 Blood Research Vol.50 No.2
Background Mesenchymal stem cells (MSCs) are valuable for cell-based therapy. However, their applicationis limited owing to their low survival rate when exposed to stressful conditions. Autophagy, the process by which cells recycle the cytoplasm and dispose of defectiveorganelles, is activated by stress stimuli to adapt, tolerate adverse conditions, or triggerthe apoptotic machinery. This study aimed to determine whether regulation of autophagywould affect the survival of MSCs under stress conditions. Methods Autophagy was induced in bone marrow-derived MSCs (BM-MSCs) by rapamycin, andwas inhibited via shRNA-mediated knockdown of the autophagy specific gene, ATG7. ATG7 expression in BM-MSCs was evaluated by reverse transcription polymerase chainreaction (RT-PCR), western blot, and quantitative PCR (qPCR). Cells were then exposedto harsh microenvironments, and a water-soluble tetrazolium salt (WST)-1 assay was performedto determine the cytotoxic effects of the stressful conditions on cells. Results Of 4 specific ATG7-inhibitor clones analyzed, only shRNA clone 3 decreased ATG7expression. Under normal conditions, the induction of autophagy slightly increased theviability of MSCs while autophagy inhibition decreased their viability. However, understressful conditions such as hypoxia, serum deprivation, and oxidative stress, the inductionof autophagy resulted in cell death, while its inhibition potentiated MSCs to withstandthe stress conditions. The viability of autophagy-suppressed MSCs was significantlyhigher than that of relevant controls (P<0.05, P<0.01 and P<0.001). Conclusion Autophagy modulation in MSCs can be proposed as a new strategy to improve their survivalrate in stressful microenvironments.
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M. Molaei,H. Hasheminejad,M. Karimipour 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.1
In this work, photoluminescence (PL) properties of CdTe and CdTe@CdS core-shellquantum dots (QDs) were investigated. CdTe and CdTe@CdS QDs were synthesizedusing a microwave activated method. CdS shell grown using a microwave activatedmethod which was based on the heat sensitivity of Na2S2O3. X-ray diffraction (XRD)analysis demonstrated cubic crystalline structure for both of the synthesized QDs, butfor CdTe@CdS QDs, XRD diffraction peaks shifted to the longer angle. Sizes of CdTeand CdTe@CdS QDs were obtained as about 2.5 and 3.5 nm from transmission electronmicroscopy (TEM) images. UV-Vis and PL spectra showed that in this method both ofthe absorption and emission of CdTe QDs shifted from near blue to near red. By thegrowth of CdS shell around CdTe QDs, a red shift was observed in absorption and PLspectra. PL QY was obtained as about 23% and 38% for CdTe and CdTe@CdS core-shellQDs, respectively. Increase in the thickness of the CdS shell was possible only by the increase in the microwave irradiation timein the CdS shell growth step. Growth of the CdS shell around CdTe core, resulted in the red shift in band edge and PL spectra tothe longer wavelengths.
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Masoumeh Molaei,S. Morteza Mousavi-Khoshdel,Ehsan Targholi 한국물리학회 2017 Current Applied Physics Vol.17 No.2
The current article carried out density functional theory calculations to investigate the 2, 5- furandicarbonitrile (FUDCN) capability for storing Na atoms. The results indicated that this organic molecule could adsorb two sodium atoms with 454 mAh g1 value of specific theoretical capacity. To assure high conductivity and stability of this molecule as an electrode material for Na-ion battery, Aldoped graphene was considered as a suitable substrate with a strong binding energy (1.87 eV) to anchor the FUDCN molecule. An interesting result was a little dependency between binding energy values and the number of the inserted Na atoms, which means that FUDCN-Al-Graphene could adsorb more Na atoms in comparison to FUDCN molecule. The high sodium storage capability, suitable voltage range, easy diffusion of sodium atoms, along with high conductivity and stability are some advantages of application of this structure as anode electrode material in Na-ion batteries.
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Asghar Molaei Dehkordi 한국화학공학회 2024 Korean Journal of Chemical Engineering Vol.41 No.1
In this article, the intensifi cation of solids mixing in tapered fl uidized beds equipped with an inlet jet and varying apex angles (2.86°, 5.71°, and 8.53°) has been investigated. In this regard, a particle segregation number (PSN) and multi-fl uid modeling (MFM) approach were employed to analyze the mixing process. The study utilized solid mixtures composed of particles with a density of 2500 kg/m 3 and diameters of 240 and 510 μm. Simulation results were validated against our experimental data obtained using a small tapered bed without an inlet jet and those obtained using a larger tapered bed with an inlet jet, as Huilin et al. (2003) reported. This validation demonstrates satisfactory agreement between the simulation results and experimental data. The solids mixing process in a columnar fl uidized bed was found to resemble that in a tapered bed with an apex angle of 2.86°. Increasing the apex angle leads to a larger equilibrium mixing value. In addition, the infl uences of inlet jet velocity and nozzle diameter on the solids mixing process were investigated. The simulation results indicated that higher inlet jet velocities and larger nozzle diameters enhance the equilibrium mixing index value. Notably, inlet jet velocities of 0.7 and 0.8 m/s exhibited three distinct solids mixing stages: rapid, slow, and equilibrium, whereas higher jet velocities only involved rapid and equilibrium mixing stages. Moreover, this study further examined how the initial arrangement of solid particles aff ects the mixing index, providing valuable insights into optimizing the solids mixing process. Furthermore, the present work sheds light on the factors infl uencing the mixing of solids in tapered fl uidized beds, off ering valuable insights for further research and industrial applications.
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Sedigheh Molaei,Mehryar Habibi Roudkenar,Fatemeh Amiri,Mozhgan Dehghan Harati,Marzie Bahadori,Fatemeh Jaleh,Mohammad Ali Jalili,Amaneh Mohammadi Roushandeh 대한혈액학회 2015 Blood Research Vol.50 No.2
Background Mesenchymal stem cells (MSCs) are valuable for cell-based therapy. However, their applicationis limited owing to their low survival rate when exposed to stressful conditions. Autophagy, the process by which cells recycle the cytoplasm and dispose of defectiveorganelles, is activated by stress stimuli to adapt, tolerate adverse conditions, or triggerthe apoptotic machinery. This study aimed to determine whether regulation of autophagywould affect the survival of MSCs under stress conditions. Methods Autophagy was induced in bone marrow-derived MSCs (BM-MSCs) by rapamycin, andwas inhibited via shRNA-mediated knockdown of the autophagy specific gene, ATG7. ATG7 expression in BM-MSCs was evaluated by reverse transcription polymerase chainreaction (RT-PCR), western blot, and quantitative PCR (qPCR). Cells were then exposedto harsh microenvironments, and a water-soluble tetrazolium salt (WST)-1 assay was performedto determine the cytotoxic effects of the stressful conditions on cells. Results Of 4 specific ATG7-inhibitor clones analyzed, only shRNA clone 3 decreased ATG7expression. Under normal conditions, the induction of autophagy slightly increased theviability of MSCs while autophagy inhibition decreased their viability. However, understressful conditions such as hypoxia, serum deprivation, and oxidative stress, the inductionof autophagy resulted in cell death, while its inhibition potentiated MSCs to withstandthe stress conditions. The viability of autophagy-suppressed MSCs was significantlyhigher than that of relevant controls (P<0.05, P<0.01 and P<0.001). Conclusion Autophagy modulation in MSCs can be proposed as a new strategy to improve their survivalrate in stressful microenvironments.
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Fatemeh Molaei,Fahime Bigdeli,Ali Morsali 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.24 No.-
A new coordination polymer, [Zn2Na4(CH3COO)8H2O]n (1) has been synthesized and characterized by IR spectroscopy. The single crystal X-ray data of compound 1 shows that this coordination polymer grows in two dimensions. Also, the ZnO nanoparticles has been synthesized by thermolysis of compound 1 in oleic acid, calcination at 500 and 600 8C under air atmosphere and sol–gel processes. Nanoparticles were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Thermal stability of compound 1 was carried out by thermal gravimetric (TG) and differential thermal analysis (DTA). The zinc(II) oxide nanoparticles were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM).
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A simple one Step Thermochemical Approach for Synthesis of ZnS:Mn Nanocrystals (NCs)
Mehdi Molaei,Ahmad Lotfiani,Fatemeh Karimi maskon,Masoud Karimipour,Mohammd Khanzadeh 대한전자공학회 2014 Journal of semiconductor technology and science Vol.14 No.1
In this work we have synthesized ZnS:Mn nanocrystals (NCs) using a simple one step thermochemical method. Zn(NO3)2 and Na2S2O3 were used as the precursors and Mn(NO3)2 was the source of impurity. Thioglycolic acid (TGA) was used as the capping agent and the catalyst of the reaction. The structure and optical property of the NCs were characterized by means of X- ray diffraction (XRD), HRTEM, UV-visible optical spectroscopy and photoluminescence (PL). X-ray diffraction (XRD) and transmission electron microscopy (TEM) analyses demonstrated cubic phase ZnS:Mn NCs with an average size around 3 nm. Synthesized NCs exhibited band gap of about 4 eV. Photoluminescence spectra showed a yellow-orange emission with a peak located at 585 nm, demonstrating the Mn incorporation inside the ZnS particles.
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Urbanization patterns in Iran visualized through spatial auto-correlation analysis
Mohamad Molaei Qelichi,Beniamino Murgante,Mohsen Yousefi Feshki,Moslem Zarghamfard 대한공간정보학회 2017 Spatial Information Research Vol.25 No.5
In recent decades urbanization in the world and Iran has changed and evolved based on a variety of patterns. Many factors influence these patterns, including climate conditions, national policies, international developments, and the economic situation. The aim of this study was to investigate changes in spatial autocorrelation pattern of urbanization in Iran. Hence, data has been extracted from the Statistical Center of Iran. At first, patterns of urbanization were calculated and then global Moran index has been used in the analysis of spatial pattern changes. The results showed that central and northern regions of the country, particularly Isfahan and Tehran, in all courses have a positive spatial autocorrelation pattern and its intensity has increased in recent times. This is while the south-eastern half of the country, due to climatic determinism, has a negative spatial autocorrelation pattern.
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A typology of Stonehenge online images: World Heritage Sites and their representations for tourism
Pari Molaei,William C. Hunter 한국관광연구학회 2020 관광연구저널 Vol.34 No.4
As heritage and cultural tourism gain popularity, the number and variety of “tourist places” designated as World Heritage Sites have grown. Although the universality or national embodiment of World Heritage Sites is a significant topic to be examined, a potential and comprehensive study on it, especially in recent years, has remained incomplete. Combining this issue with the problematic issue of the reckless inscription of new sites to the World Heritage List every single year makes it even more prominent and leaves room for a re-examination of the status of the World Heritage program and the 1972 Convention today. Some scholars have raised this issue in both contextual form and semiotic analysis. Nevertheless, examining and evaluating World Heritage Sites’ status from the perspective of non-academics (tourists, media creators) and non-officials is still missing or under-researched. Thus, this study was conducted to review this issue via a typology of online images of Stonehenge using semiotics. The findings of this study based on analyzing visual data lend support to the previous propositions through a collection of Stonehenge’s images found from web-based sources.
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