A Numerical Simulation Study on the Effects of Crucible Rotation and Magnetic Fields in Growth of SiGe by the Traveling Heater Method

2011 ◽  
Vol 134 (1) ◽  
Author(s):  
Youhei Takagi ◽  
Yasunori Okano ◽  
Sadik Dost
Keyword(s):  
Magnetic Field ◽  
Numerical Simulation ◽  
Static Magnetic Field ◽  
Simulation Study ◽  
Concentration Field ◽  
Magnetic Field Direction ◽  
Simultaneous Application ◽  
Rotation Rates ◽  
Traveling Heater Method ◽  
Crucible Rotation

A numerical simulation study was carried out to shed light on the effects of applied crucible rotation and static magnetic field during the traveling heater method growth of bulk SiGe single crystals. The simulation results show that the application of crucible rotation weakens the radial silicon concentration gradient due to the effect of centrifugal force. The effects of applied static magnetic field direction and strength on the concentration field in the melt were also studied. It was found that the simultaneous application of crucible rotation and static magnetic field is best to grow large crystals with uniform composition. An optimum combination of crucible rotation rates and applied magnetic field strengths is determined.

A Numerical Simulation Study on the Effects of Crucible Rotation and Magnetic Fields in Growth of SiGe by the Travelling Heater Method

2010 ◽  
Author(s):  
Youhei Takagi ◽  
Atsuko Ishida ◽  
Yasunori Okano ◽  
Sadik Dost
Keyword(s):  
Magnetic Field ◽  
Numerical Simulation ◽  
Static Magnetic Field ◽  
Simulation Study ◽  
Concentration Field ◽  
Magnetic Field Direction ◽  
Simultaneous Application ◽  
Rotation Rates ◽  
Crucible Rotation ◽  
Shed Light

A numerical simulation study was carried out to shed light on the effects of applied crucible rotation and static magnetic field during the THM (travelling heater method) growth of bulk SiGe single crystals. The simulation results show that the application of crucible rotation weakens the radial silicon concentration gradient due to the effect of centrifugal force. The effects of applied static magnetic field direction and strength on the concentration field in the melt were also studied. It was found that the simultaneous application of crucible rotation and static magnetic field is best to grow large crystals with uniform composition. An optimum combination of crucible rotation rates and applied magnetic field strengths is determined.

Numerical Simulation Study for the Effect of the Strength and the Direction of a Static Magnetic Field on the Transient Double-Diffusive Flow in Liquid Phase during an Alloy Solidification

2010 ◽  
Vol 297-301 ◽  
pp. 97-104 ◽  
Author(s):  
Farid Mechighel ◽  
Bernard Pateyron ◽  
Mahfoud Kadja ◽  
Mohammed El Ganaoui ◽  
S. Dost
Keyword(s):  
Magnetic Field ◽  
Numerical Simulation ◽  
Static Magnetic Field ◽  
Simulation Study ◽  
Solidification Process ◽  
Magnetic Field Effects ◽  
Charge Balance ◽  
Diffusive Flow ◽  
Volume Method ◽  
Double Diffusive

A numerical simulation study has been carried out to examine the effect of a static magnetic field on the solidification process of an alloy. A mathematical model, based on the continuum model, was developed for the computation of a transient double-diffusive fluid flow under Lorentz body force. The model includes conservation of mass and momentum, heat, species and electrical charge balance equations. The simulation domain was selected as a cavity filled with a metallic alloy and differentially heated, which may be taken as a Bridgman model domain used in the crystal growth process. The solution is carried out by using a Finite Volume Method. Study of the direction and the intensity of the applied magnetic field effects on stabilizing the double diffusive flow field were also carried out. Simulation results indicate that the use of a static, magnetic field in this growth setup is effective in suppressing natural convection in the solution.

Simultaneous application of cisplatin and static magnetic field enhances oxidative stress in HeLa cell line

2017 ◽  
Vol 53 (9) ◽  
pp. 783-790 ◽  
Author(s):  
Samaneh Kamalipooya ◽  
Parviz Abdolmaleki ◽  
Zahra Salemi ◽  
Fatemeh Javani Jouni ◽  
Jaber Zafari ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Magnetic Field ◽  
Hela Cell ◽  
Cell Line ◽  
Static Magnetic Field ◽  
Hela Cell Line ◽  
Simultaneous Application

Formation of c-Axis Aligned Hydroxyapatite Sheet by Simultaneous Imposition of High Magnetic Field and Mold Rotation During Slip Casting Process

2006 ◽  
Vol 309-311 ◽  
pp. 53-56 ◽  
Author(s):  
Jun Akiyama ◽  
Masami Hashimoto ◽  
Hiroaki Takadama ◽  
Fukue Nagata ◽  
Yoshiyuki Yokogawa ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Materials ◽  
High Magnetic Field ◽  
Static Magnetic Field ◽  
Slip Casting ◽  
Casting Process ◽  
Field Direction ◽  
Magnetic Field Direction ◽  
Hydroxyapatite Crystal ◽  
Crystal Alignment

A high magnetic field is a useful tool to control the crystal alignment of non-magnetic materials such as ceramics and polymers. In the case of Hydroxyapatite crystal, the a,b-axis is aligned parallel to the direction of an imposed magnetic field. This fact implies that the alignment of the c-axis is not controllable only using a high static magnetic field due to the freedom of the c-axis in a plane perpendicular to a magnetic field direction. In this study, a high static magnetic field and mold rotation was simultaneously so applied during a slip casting process as to align the c-axis of HAp poly crystals.

scholarly journals Modification of Phytochemical Production and Antioxidant Activity of Dracocephalum Kotschyi Cells by Exposure to Static Magnetic Field and Magnetite Nanoparticles

2021 ◽  
Author(s):  
Marzieh Taghizadeh ◽  
Fatemeh Nasibi ◽  
Khosrow Khosrow Manouchehri kalantari ◽  
Mohsen Mohseni-Moghadam
Keyword(s):  
Magnetic Field ◽  
Static Magnetic Field ◽  
Magnetite Nanoparticles ◽  
High Performance ◽  
Culture Media ◽  
Cell Suspension Cultures ◽  
Simultaneous Exposure ◽  
Simultaneous Application ◽  
Enhanced Production ◽  
Dracocephalum Kotschyi

Abstract Dracocephlum kotschyi Boiss is a genus in Lamiaceae family and a medicinal herb native to Iran. The cell suspension cultures were treated by static magnetic field (SMF) and Fe3O4 magnetite nanoparticles (MNP) to understand the production yield of secondary metabolites. The treatment procedure was done by cultivating the cells either with 100 ppm MNP, SMFs, or simultaneous exposure to both MNP and SMFs. The SMF at 30 mT was uniformly applied to the cells either for 3 or 4 days with a 3 h per day or a 5 h per day intervals, respectively. The contents of phenolics and phytochemicals were then examined by high performance liquid chromatography and UV-Vis spectrophotometer. These treatments imposed oxidative stress and induced polyphenol oxidase and phenylalanine ammonia lyase, accompanied by enhanced production of phenolics, anthocyanins, flavonoids, and lignin. The highest membrane embrittlement and elicitation was found upon simultaneous application of the MNPs and SMFs, followed by the MNP and SMFs. The contents of naringin, rosmarinic acid, quercetin, thymol, carvacrol, apigenin, and rutin increased in the intracellular biomass of all treated cells and extracellular culture media. These findings propose the potential of these elicitors in simultaneous production and secretion of these phytochemicals into culture media.

Numerical Simulation of the Static Magnetic Field Regulation of the Laser Molten Pool Heat Transfer and Flow Behavior

Applied laser ◽  
2014 ◽  
Vol 34 (6) ◽  
pp. 508-512 ◽  
Author(s):  
胡勇 Hu Yong ◽  
陈智君 Chen Zhijun ◽  
王梁 Wang Liang ◽  
姚建华 Yao Jianhua
Keyword(s):  
Magnetic Field ◽  
Heat Transfer ◽  
Numerical Simulation ◽  
Static Magnetic Field ◽  
Molten Pool ◽  
Flow Behavior

Numerical simulation study on Cz growth of silicon single crystal in a magnetic field

2002 ◽  
Author(s):  
Jinghe Liu ◽  
Jing Sun ◽  
Zhongli Zhu ◽  
Ying Cao ◽  
Ling Liu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Numerical Simulation ◽  
Single Crystal ◽  
Simulation Study ◽  
Silicon Single Crystal
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