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RISS 인기검색어
- 검색키워드
- 저자 : Moshfegh, A. Z. (검색결과 3 건)
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Abouzar Moshfegh,Ashkan Javadzadegan,Zhaoqi Zhang,Hamid Hassanzadeh Afrouzi,Mohammad Omidi 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.8
It is well accepted that blood flow in the human aorta is spiral by nature, with beneficial impacts for the cardiovascular system in the form of improved haemodynamics and efficient perfusion. This study investigates the effect of aortic spiral blood flow on wall shear stress (WSS) in computer-generated models of the left main trunk (LMT), also known as left main coronary artery, with varying take-off angle, stenosis severity and eccentricity. The results show that the spirality effect causes a substantial reduction in maximum WSS (WSS max ), average WSS (WSS ave ) and size of regions with low WSS. The effects of spiral flow on WSS max become more significant with increasing LMT take-off angle and stenosis eccentricity, and they become less significant with increasing stenosis severity. The aortic spiral blood flow intensity, LMT take-off angle, stenosis severity and eccentricity statistically significantly predict the WSS; however, the strongest predictor of WSS is stenosis severity (F(4, 399) = 3653.85, p < 0.001 for WSS max and F(4, 399) = 913.46, p < 0.001 for WSS ave ), followed by LMT take-off angle (F(4, 399) = 582.735, p < 0.001 for WSS max and F(4, 399) = 163.16, p < 0.001 for WSS ave ), stenosis eccentricity (F(4, 399) = 230.15, p < 0.001 for WSS max and F(4, 399) = 52.94, p < 0.001 for WSS ave ) and blood flow spirality (F(4, 399) = 112.37, p < 0.001 for WSS max and F(4, 399) = 32.18, p < 0.001 for WSS ave ). Our findings suggest that naturally or artificially induced spiral flow in the aorta potentially has atheroprotective effects in the LMT.
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Naseri, N.,Qorbani, M.,Kim, H.,Choi, W.,Moshfegh, A. Z. American Chemical Society 2015 The Journal of Physical Chemistry Part C Vol.119 No.3
<P>Considering hydrogen as a future fuel, development of clean energy sources based on solar power is the main human challenge in recent years. Here, for the first time, Au:WO<SUB>3</SUB> photoanodes are synthesized with different Au concentrations and then applied for photoelectrochemical (PEC) water splitting. A comprehensive statistical study on the prepared photoanode surface is conducted to understand the correlation between surface morphology and PEC activity, using atomic force microscopy (AFM). The results clearly justified the maximum surface area observed for the film containing 1 mol % Au. Additionally, X-ray diffraction (XRD) analysis determined that Au nanocrystals have been formed in cubic structure with the size of 29–52 nm. X-ray photoelectron spectroscopy (XPS) revealed that the presence of Au in a combined metal/oxide state strongly affects on the Au:WO<SUB>3</SUB> photoanode performance. Photoresponse investigation of the synthesized films showed that the highest photocurrent was obtained for the sample containing 1 mol % gold with the maximum incident photon to current efficiency (IPCE) of about 20% at 360 nm wavelength. In addition, measuring the amount of hydrogen produced in the water splitting reaction supports the result that the sample containing 1 mol % Au exhibits the highest hydrogen production rate (∼3 μmol/h) as compared to other samples.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2015/jpccck.2015.119.issue-3/jp507988c/production/images/medium/jp-2014-07988c_0011.gif'></P>
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Two-dimensional materials in semiconductor photoelectrocatalytic systems for water splitting
Faraji, Monireh,Yousefi, Mahdieh,Yousefzadeh, Samira,Zirak, Mohammad,Naseri, Naimeh,Jeon, Tae Hwa,Choi, Wonyong,Moshfegh, Alireza Z. The Royal Society of Chemistry 2019 Energy & environmental science Vol.12 No.1
<P>Hydrogen (H2) production <I>via</I> solar water splitting is one of the most ideal strategies for providing sustainable fuel because this requires only water and sunlight. In achieving high-yield production of hydrogen as a recyclable energy carrier, the nanoscale design of semiconductor (SC) materials plays a pivotal role in both photoelectrochemical (PEC) and photocatalytic (PC) water splitting reactions. In this context, the advent of two-dimensional (2D) materials with remarkable electronic and optical characteristics has attracted great attention for their application to PEC/PC systems. The elaborate design of combined 2D layered materials interfaced with other SCs can markedly enhance the PEC/PC efficiencies <I>via</I> bandgap alteration and heterojunction formation. Three classes of 2D materials including graphene, transition metal dichalcogenides (TMDs), and graphitic carbon nitride (g-C3N4), and their main roles in the photoelectrocatalytic production of H2, are discussed in detail herein. We highlight the various roles of these 2D materials, such as enhanced light harvesting, suitable band edge alignment, facilitated charge separation, and stability during the water splitting reaction, in various SC/2D photoelectrode and photocatalytic systems. The roles of emerging 2D nanomaterials, such as 2D metal oxyhalides, 2D metal oxides, and layered double hydroxides, in PEC H2 production are also discussed.</P>
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