http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Semnani, Shahryar (검색결과 29 건)
- 무료
- 기관 내 무료
- 유료
-
Semnani, Abolfazl,Pouretedal, Hamid Reza,Hossein Keshavarz, Mohammad Korean Chemical Society 2006 Bulletin of the Korean Chemical Society Vol.27 No.6
The interaction between tetraethylammonium chloride (TEACl) with ICl and tetraethylammonium iodide (TEAI) and aza-15-crown-5 (A15C5) with $I_2$ and ICl have been examined spectrophotometrically in acetonitrile solution. The results of TEACl-ICl indicate the formation of $ICl_2$ - through equilibrium reaction. In the case of TEAI-$I_2$ and A15C5-$I_2$, the equilibrium formation of $I_3$ - is confirmed. The interaction of TEAI-ICl begins with the simultaneous production of $I_2$ and IC$I_2$ - (at TEAI/ICl < 0.5) as well as continues with the simultaneous consumption of $I_2$ and formation of I$I_3$ - (at TEAI/ICl > 0.5). Similar behavior is also observed for A15C5-ICl system. However, the changes are seen at A15C5/ICl mole ratios less and more than 0.66. Several equations have been suggested for the formation of detected species. The formation constants of various reactions were evaluated from the computer fitting of the absorbance-mole ratio data. IR spectra of A15C5 and 1:1 A15C5:ICl or A15C5:$I_2$ complexes are compared and the effect of complexation on absorption bands is discussed.
-
Jacquard pattern optimizing in weft knitted fabrics via interactive genetic algorithm
Dariush Semnani,Mehdi Hadjianfar,Hamed Aziminia,Mohammad Sheikhzadeh 한국의류학회 2014 Fashion and Textiles Vol.1 No.1
A genetic algorithm is a method to respond to troubles that are indissoluble by common methods and must be utilized to try and fault method. It is difficult to appraise all of responses if there are many answers. Algorithm genetic can contain a large vast of responses and find the best of them by receiving feedbacks from problems. Several designs with different colors can be done in weft knitted Jacquard designing system. However, many patterns might not have enough attractiveness and beauty. The choice of interesting and stylish patterns of the huge set of designs according to customer judgment is difficult. An interactive genetic algorithm that received necessary feedbacks from the user, can be used in design optimization and choosing ideal patterns. In this paper a software has been constructed to optimize jacquard pattern in weft knitted fabrics based on interactive genetic algorithm.
-
Dariush Semnani,Farshad Hassani,Mehdi Hadjianfar,Pedram Rezazadeh Tehrani 한국의류학회 2016 Fashion and Textiles Vol.3 No.1
The aim of the present research is evaluating the impact resistance of weft knitted fabrics which are knitted in basic patterns from the high tenacity Nylon 66. The woven fabrics have been applied for manufacturing technical and ballistic textiles so far. Although woven fabrics have been demonstrated satisfactory tensile properties, but they have not been resisted against impact, because of their poor strain against tensile forces. This research is important because knitted fabrics are applied in wide range of applications including technical textiles such as, package belts, safety belts, ballistic belts, and can be used to remove ice from airplane wings. Various knitted fabrics with different knitting elements such as knit, tuck and miss loops were produced. Mechanical properties including strength, work of the rupture and impact resistance of knitted samples were tested. The artificial neural network was used to predict mechanical properties of fabrics produced from the knitted structure as fitness function in genetic algorithm. After that, genetic algorithm was applied to find the optimum structure of knitted fabric with maximum impact resistance. The results of the genetic algorithm show that optimum structure of the fabric is cross-miss and rib structure with high stitch density.
-
-
Salamat, Faezeh,Semnani, Shahryar,Aboomardani, Maryam,Roshandel, Gholamreza Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.6
Background: Nutrition transition is a global health problem, especially in developing countries. It is known as an important factor for development of different types of health conditions including cancers. Objectives: We aimed to assess the pattern of nutrition transition in a high-risk area for upper gastrointestinal cancers in Northern Iran during the last decade. Materials and Methods: This cross-sectional study was conducted on households of Golestan province, Iran. Data on household food consumption between 2001 and 2010 were obtained from the Statistical Center of Iran. The proportions of households with medium/high consumption of main foods were calculated for each year. Joint point software was used for assessing trends. Annual percent changes (APCs) and 95%CIs were calculated. Results: In total, 12,060 households were recruited. The APCs (95%CI) of the proportion of households medium/high consumption of cereals, vegetables, legumes, fish, dairy products and meats were -3.1 (-4.1 to -2.2), -2.9 (-3.8 to -2.1), -2.3 (-3.2 to -1.4), -2.8 (-3.3 to -2.4), -1.9 (-3.0 to -0.9) and 2.7 (1.2 to 4.3), respectively. Conclusions: We found significant increase in meat consumption among our population between 2001 and 2010. Our results also suggested significant decreasing trend in consumption of so-called healthy foods including, plant foods, fish, and dairy products. Regarding its correlation with health conditions including cancers, nutrition transition should be considered as a priority in health policy making in our region as well as other high-risk populations. It is recommended to conduct community level interventions to increase consumption of plant foods, fish, and dairy products.
-
Perfect 2-Colorings of k-Regular Graphs
Piri, Farzaneh,Semnani, Saeed Mohammadian Department of Mathematics 2020 Kyungpook mathematical journal Vol.60 No.2
We study perfect 2-colorings of regular graphs. In particular, we consider the 4-regular case. We obtain a characterization of perfect 2-colorings of toroidal grids.
-
Recessed Gate Cylindrical Heterostructure TFET, a Device with Extremely Steep Subthreshold Swing
Danial Keighobadi,Saeed Mohammadian Semnani,Mohaddeseh Mohtaram 한국전기전자재료학회 2022 Transactions on Electrical and Electronic Material Vol.23 No.1
In this paper, we present a novel cylindrical gate-all-around heterostructure TFET that benefits from recessed gate architecture to enable line tunneling of charge carriers normal to the gate at InGaAs/InP heterojunction. In the proposed TFET, the channel and drain regions are composed of a wide-bandgap semiconductor which results in a considerable suppression of ambipolar conduction and off-state current. The device characteristics are investigated by numerical simulations and the results indicate impressive switching performance of the proposed transistor. Owing to designed geometry and employed material system, we obtain an extremely steep subthreshold swing, sub 3mv/dec over 6 decades of drain current, sub 60mv/dec over 10 decades of drain current, and average subthreshold swing of 21mv/dec, an on-state to off-state current ratio of about 10 12 , and an on-state current of about 100nA at V GS = 0.3 V. The influence of variations in the device dimensions, doping and bias condition on its electrical characteristics is also studied and discussed physically.
-
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>
-
Switching Performance Investigation of a Gate-All-Around Core-Source InGaAs/InP TFET
Danial Keighobadi,Saeed Mohammadian Semnani,Mohaddeseh Mohtaram 한국전기전자재료학회 2021 Transactions on Electrical and Electronic Material Vol.22 No.4
A novel core-source gate-all-around TFET based on InGaAs/InP heterojunction is presented in this paper. In the proposed device, the main current flow mechanism is line tunneling which occurs across a heterojunction composed of a narrowbandgap material of source and a wide-bandgap material of channel. The off-state current and ambipolar conduction are diminished by simultaneously employing two different doping concentrations in the channel region, as well as a wide-bandgap material in drain region. We study the switching performance of the device using a calibrated numerical device simulator. The results indicate impressive performance of the proposed transistor, including an extremely steep subthreshold swing, sub 3mv/dec over 5 decades and sub 60mv/dec over 9 decades of drain current, and average subthreshold swing of about 27mv/dec, and an on-state to off-state current ratio of about 10 11 at V GS = 0.3 V. The impact of variations in the device dimensions, doping and bias condition on its electrical characteristics is also studied and discussed physically.
-
Fataneh Rouhollahi Vernosfaderani,Dariush Semnani 한국섬유공학회 2018 Fibers and polymers Vol.19 No.3
Controlled release of drugs is important to reduce the amount of medication in treatment of any diseases and improves life quality. Poly(e-caprolactone) (PCL) has a low biodegradation rate that is a disadvantage in the biomedical and pharmaceutical fields. Poly(N-vinyl-2-pyrrolidone) (PVP) is a water-soluble polymer that to overcome of PCL low biodegradation rate, electrospinning of PCL blended with PVP was used for shell of nanofibers with controllable degradation rates and drug release rates. Oral and vaginal mucosal infections mainly caused by candida albicans. It is usually a harmless commensal organism; however it is known as an opportunistic pathogen for almost immunologically week and immune compromised people. Amphotericin-B (AmB) is a strong polyene antifungal antibiotic that has a significantly efficacy on candida albicans. This study is manufactured and optimized the PVP-PCL shell/PVP-AmB core nanofiberous tissue by working distance and feed flow rate for controlled drug release . AmB with PVP was successfully inserted into the core. PVPPCL shell (50/50)/PVP-AmB core nanofiberous were electrospinning with two optimum distances working and two flow rates. The mechanical properties of coaxial nanofibers were analyzed by instron machine. Scanning electron microscopy and transmission electron microscopy was used for analysis morphology. Further, drug release test were done for coaxial nanofibers with AmB different morphologies. The effect of flow rate and working distance on morphology and mechanical properties were evaluated by statistical two-way analysis of the variance (ANOVA). The diameter averages of nanofibers were decreased significantly by increasing working distance. Moreover, the stress and strain were increased by increasing working distance. Coaxial nanofibers biodegradability rate and drug release of nanofibers were increased also by increasing working distance and flow rate of core. Nanofibers drug release mechanism was indicated by Korsmeyer-Peppas which they followed fick′s lows and Higuchi model significantly. Also, results presented that biodegradability and drug release rate accelerate with increasing the working distance and increasing the amount of PVP in core.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
