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RISS 인기검색어
- 검색키워드
- 저자 : ( Mehran Nouri ) (검색결과 6 건)
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Computational and Experimental Studies on the Effect Back Pressure on Twist Extrusion Process
Mehran Nouri,Hamidreza Mohammadian Semnani,Esmaeil Emadoddin 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.8
In the current study, aluminium 6063 alloy (AA6063) was successfully gain refined by twist extrusion (TE) technique. TEis a representative severe plastic deformation process to fabricate ultrafine-grained in bulk materials by repetitive passes. In order to investigate the influence of back pressure, a direct extrusion (DE) channel was embedded after the twist zoneand the behavior of AA6063 was investigated and compared with and without this channel. Analyzing microstructuralevolutions by scanning electron microscope and Vickers microhardness evaluations showed that, adding the DE channelincreased the hardness distribution and a more homogenous structure was obtained. Finite element analysis was utilized tostudy the distribution of the equivalent plastic strain (PEEQ) numerically. According to the obtained results, with applyingthe TE process, strain increase was observed all over the sample surface, whereas modeling the DE channel after the twistzone caused a better homogeneity in the PEEQ distribution of the transverse cross-section. The PEEQ distribution duringTE process can be correlated to the extent of grain refinement and the uniformity of ultrafine grains. This method seems tobe very interesting and very promising for the future industrial application.
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( Mehran Rahimlou ),( Sara Sohaei ),( Mohammadhossein Nasr-esfahani ),( Mehran Nouri ) 한국임상영양학회 2019 Clinical Nutrition Research Vol.8 No.3
The objective of this study was to assess the association between dietary antioxidant intake and semen quality parameters in infertile men. In this cross-sectional study, dietary antioxidant intake was evaluated in 175 infertile Iranian men by a validated dish-based 106-item semi-quantitative food frequency questionnaire. Men were asked to abstain from ejaculation for at least 72 hours before sample collection. Semen parameters were assessed by a sperm counting chamber and Terminal deoxynucleotidyl transferase dUTP nick end labeling assay methods. Linear quantile regression was used to determine the associations between antioxidant nutrient intake and semen quality parameters (including total sperm count, sperm density, total motility, DNA damage and DNA fragmentation). Mean age of study participants was 32.19 ± 2.34 years. Compared with the lowest quartile, men in the highest quartile of dietary β-carotene and vitamin C intake had lower sperm DNA fragmentation index (P<sub>trend</sub> = 0.042 and P<sub>trend</sub> = 0.03, respectively). Also, dietary intake of beta-cryptoxanthin had a positive association with sperm density (P<sub>trend</sub> = 0.02), and dietary lutein was associated with total sperm count (P<sub>trend</sub> = 0.045). Dietary intake of other antioxidants did not significantly correlate with the indicators related to the quantity and quality of sperm (p > 0.05). These data suggest that dietary intake of some of the antioxidants is associated with semen related parameters.
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Nouri, Mehran,Mohammadian Semnani, Hamidreza,Emadoddin, Esmaeil,Seop Kim, Hyoung Elsevier 2018 MEASUREMENT -LONDON- Vol.127 No.-
<P><B>Abstract</B></P> <P>Twist extrusion (TE) is a relatively new severe plastic deformation technique in which radial deformation is heterogeneously distributed in the sample. In this research, in order to achieve favorable properties, a direct extrusion (DE) channel was embedded after the twist zone at the bottom of the TE die. The plastic deformation behavior of aluminum alloy 6063 (AA6063) was investigated in the TE process, with and without the DE channel. AA6063 successfully underwent TE under the conditions designed using the finite element analysis. According to the simulation results, a very heterogeneous distribution of the equivalent plastic strain (PEEQ) was observed in TE, while the TE+DE simulation exhibited more homogeneous PEEQ in the central and lateral regions. Microstructural evolution analysis using scanning electron microscope and Vickers microhardness evaluations showed that utilizing the DE channel increased the hardness and provided a more homogenous microstructure. Moreover, tensile testing results indicated an increase in strength and enhanced mechanical properties of the TE+DE processed AA6063.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Innovative twist extrusion was achieved by embedding a direct extrusion channel after the twist zone. </LI> <LI> Finite element analysis showed that the direct extrusion channel decreased sample deformation heterogeneity. </LI> <LI> All data indicated that absence of sufficient back pressure led to distortion and elongation of samples. </LI> <LI> The best microstructure was achieved by combining twist extrusion and direct extrusion channel. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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MAPS PRESERVING JORDAN AND ⁎-JORDAN TRIPLE PRODUCT ON OPERATOR ⁎-ALGEBRAS
Darvish, Vahid,Nouri, Mojtaba,Razeghi, Mehran,Taghavi, Ali Korean Mathematical Society 2019 대한수학회보 Vol.56 No.2
Let ${\mathcal{A}}$ and ${\mathcal{B}}$ be two operator ${\ast}$-rings such that ${\mathcal{A}}$ is prime. In this paper, we show that if the map ${\Phi}:{\mathcal{A}}{\rightarrow}{\mathcal{B}}$ is bijective and preserves Jordan or ${\ast}$-Jordan triple product, then it is additive. Moreover, if ${\Phi}$ preserves Jordan triple product, we prove the multiplicativity or anti-multiplicativity of ${\Phi}$. Finally, we show that if ${\mathcal{A}}$ and ${\mathcal{B}}$ are two prime operator ${\ast}$-algebras, ${\Psi}:{\mathcal{A}}{\rightarrow}{\mathcal{B}}$ is bijective and preserves ${\ast}$-Jordan triple product, then ${\Psi}$ is a ${\mathbb{C}}$-linear or conjugate ${\mathbb{C}}$-linear ${\ast}$-isomorphism.
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MAPS PRESERVING JORDAN TRIPLE PRODUCT A<sup>*</sup>B + BA<sup>*</sup> ON *-ALGEBRAS
Taghavi, Ali,Nouri, Mojtaba,Razeghi, Mehran,Darvish, Vahid The Kangwon-Kyungki Mathematical Society 2018 한국수학논문집 Vol.26 No.1
Let $\mathcal{A}$ and $\mathcal{B}$ be two prime ${\ast}$-algebras. Let ${\Phi}:\mathcal{A}{\rightarrow}\mathcal{B}$ be a bijective and satisfies $${\Phi}(A{\bullet}B{\bullet}A)={\Phi}(A){\bullet}{\Phi}(B){\bullet}{\Phi}(A)$$, for all $A,B{\in}{\mathcal{A}}$ where $A{\bullet}B=A^{\ast}B+BA^{\ast}$. Then, ${\Phi}$ is additive. Moreover, if ${\Phi}(I)$ is idempotent then we show that ${\Phi}$ is ${\mathbb{R}}$-linear ${\ast}$-isomorphism.
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Maps preserving Jordan and $\ast$-Jordan triple product on operator $\ast$-algebras
Vahid Darvish,Mojtaba Nouri,Mehran Razeghi,Ali Taghavi 대한수학회 2019 대한수학회보 Vol.56 No.2
Let $\mathcal{A}$ and $\mathcal{B}$ be two operator $\ast$-rings such that $\mathcal{A}$ is prime. In this paper, we show that if the map $\Phi:\mathcal{A}\to\mathcal{B}$ is bijective and preserves Jordan or $\ast$-Jordan triple product, then it is additive. Moreover, if $\Phi$ preserves Jordan triple product, we prove the multiplicativity or anti-multiplicativity of $\Phi$. Finally, we show that if $\mathcal{A}$ and $\mathcal{B}$ are two prime operator $\ast$-algebras, $\Psi:\mathcal{A}\to\mathcal{B}$ is bijective and preserves $\ast$-Jordan triple product, then $\Psi$ is a $\mathbb{C}$-linear or conjugate $\mathbb{C}$-linear $\ast$-isomorphism.
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