Magnetic field effects upon photochemistry of bichromophoric chain molecules containing nitroaromatic and arylamino moieties: Elucidation of reaction mechanism and control of reaction yields

1988 ◽  
Vol 66 (8) ◽  
pp. 1989-1996 ◽  
Author(s):  
Ryoichi Nakagaki ◽  
Kiyoshi Mutai ◽  
Mitsuo Hiramatsu ◽  
Hideyuki Tukada ◽  
Saburo Nakakura
Keyword(s):  
Magnetic Field ◽  
Branching Ratio ◽  
Relative Yield ◽  
Field Analysis ◽  
Coupling Mechanism ◽  
Magnetic Field Effects ◽  
Appreciable Change ◽  
Field Effects ◽  
Magnetic Field Analysis ◽  
The Magnetic Field

The photochemistry of bichromophoric species containing nitroaromatic and arylamino moieties has been studied in the presence and absence of an external magnetic field. Photolysis products are an unsubstituted arylamine, a nitrosoaromatic species (Product 1), and a nitroaromatic compound (Product 2). On application of the magnetic field, the formation yield for Product 1 decreases and that for Product 2 correspondingly increases, whereas the consumption of the starting material and the release of the unsubstituted arylamine are independent of the magnetic field. Analysis of the magnetic field effects shows that the hyperfine coupling mechanism predominates and that the photoreaction takes place in the triplet manifold of the nitroaromatic moiety. Application of the magnetic field may cause an appreciable change in the relative yield of cage and escape products, i.e., the branching ratio of competitive processes.

2-D Magnetic Field Analysis of Air Cylinder with MR Sensor

2011 ◽  
Vol 121-126 ◽  
pp. 2706-2709
Author(s):  
Dan Jiang ◽  
Ping Yang ◽  
Kun Jiang
Keyword(s):  
Magnetic Field ◽  
Field Analysis ◽  
Magnetic Flux Density ◽  
Piston Motion ◽  
Element Analysis ◽  
Pneumatic Control ◽  
Magnetoresistive Sensor ◽  
Magnetic Field Analysis ◽  
Working Principle ◽  
The Magnetic Field

As a type of solid state switch, MR (magnetoresistive) sensor detects the air cylinder piston’s position in pneumatic control system. The construction and working principle of the air cylinder with MR sensor are introduced. Using 2-D magnetic field finite element analysis (FEA) method, the magnetic field distribution of air cylinder with piston motion is analyzed. Simulation results are given. The magnetic flux density characteristics are compared between piston wear or not.

The 3D Magnetic Field Analysis of Excitation Unit of Drill Pipe MFL Testing Based on ANSYS

2013 ◽  
Vol 694-697 ◽  
pp. 1179-1182
Author(s):  
Yi Lai Ma ◽  
Li Lin ◽  
Kai Wen Jiang ◽  
Xu Lin Zhao
Keyword(s):  
Magnetic Field ◽  
Magnetic Flux ◽  
Drill Pipe ◽  
Magnetic Flux Leakage ◽  
Field Analysis ◽  
Ansys Software ◽  
Magnetic Field Analysis ◽  
The Cost ◽  
The Magnetic Field ◽  
Flux Leakage

Magnetic flux leakage is one type of electromagnetic nondestructive testing (NDT) which is widely utilized in the testing the integrity of drill pipe in the field. In this paper, the 3D model of excitation unit is completely built and analyzed by ANSYS software. The magnetic field of drill pipe in the combination of full excitation device is showed by ANSYS software instead of the physic experiments which increases the efficiency tremendously and decreases the cost and achieves the anticipated desire. It is considered that this technique can provide the theoretical basis of drill pipe excitation device and the magnetic flux leakage testing of drill pipe.

Magnetic Field Analysis of Surface-Mounted Permanent-Magnet Motors

2011 ◽  
Vol 52-54 ◽  
pp. 285-290
Author(s):  
Yi Chang Wu ◽  
Feng Ming Ou ◽  
Bo Wei Lin
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Magnetic Circuit ◽  
Circuit Model ◽  
Field Analysis ◽  
Permanent Magnet Motors ◽  
Element Analysis ◽  
Magnetic Field Analysis ◽  
Field Estimation ◽  
The Magnetic Field

The prediction of the magnetic field is a prerequisite to investigate the motor performance. This paper focuses on the magnetic field estimation of surface-mounted permanent-magnet (SMPM) motors based on two approximations, i.e., the magnetic circuit analysis and the finite-element analysis (FEA). An equivalent magnetic circuit model is applied to analytically evaluate the magnetic field of a SMPM motor with exterior-rotor configuration. The two-dimensional FEA is then applied to numerically calculate the magnetic field and to verify the validity of the magnetic circuit model. The results show that the errors between the analytical predictions and FEA results are less than 6%. It is of benefit to further design purposes and optimization of SMPM motors.

scholarly journals LOCAL ORDER AND MAGNETIC FIELD EFFECTS ON THE ELECTRONIC PROPERTIES OF DISORDERED BINARY ALLOYS IN THE QUANTUM SITE PERCOLATION LIMIT

1999 ◽  
Vol 13 (32) ◽  
pp. 3861-3877
Author(s):  
D. F. DE MELLO ◽  
G. G. CABRERA
Keyword(s):  
Magnetic Field ◽  
Electronic Properties ◽  
Binary Alloys ◽  
Finite Size ◽  
Local Order ◽  
Destructive Interference ◽  
Magnetic Field Effects ◽  
Site Percolation ◽  
Field Effects ◽  
The Magnetic Field

Electronic properties of disordered binary alloys are studied via the calculation of the average Density of States (DOS) in two and three dimensions. We propose a new approximate scheme that allows for the inclusion of local order effects in finite geometries and extrapolates the behavior of infinite systems following finite-size scaling ideas. We particularly investigate the limit of the Quantum Site Percolation regime described by a tight-binding Hamiltonian. This limit was chosen to probe the role of short range order (SRO) properties under extreme conditions. The method is numerically highly efficient and asymptotically exact in important limits, predicting the correct DOS structure as a function of the SRO parameters. Magnetic field effects can also be included in our model to study the interplay of local order and the shifted quantum interference driven by the field. The average DOS is highly sensitive to changes in the SRO properties and striking effects are observed when a magnetic field is applied near the segregated regime. The new effects observed are twofold: there is a reduction of the band width and the formation of a gap in the middle of the band, both as a consequence of destructive interference of electronic paths and the loss of coherence for particular values of the magnetic field. The above phenomena are periodic in the magnetic flux. For other limits that imply strong localization, the magnetic field produces minor changes in the structure of the average DOS.

Magnetic Field Analysis for Magnetron Sputtering Apparatus for Accurate Composition Control

2009 ◽  
Vol 154 ◽  
pp. 175-179 ◽  
Author(s):  
Yutaka Sakurai ◽  
Ryo Nakajima ◽  
Hiroko Nakamura
Keyword(s):  
Magnetic Field ◽  
Finite Element Method ◽  
Magnetron Sputtering ◽  
Field Analysis ◽  
The Finite Element Method ◽  
Film Composition ◽  
Composite Target ◽  
Composition Control ◽  
Magnetic Field Analysis ◽  
The Magnetic Field

Authors use magnetron sputtering technique for controlling the film composition by modifying the magnetic field with an external solenoid in addition to the magnetic field with a permanent magnet on back of composite target. It is necessary to understand the contribution of the solenoid quantitatively for the effective application of this technique. The magnetic field changes by the solenoid current on the target were calculated by the finite element method (FEM), and compared with the film composition. As the solenoid current increases, magnetic tunnel region on the target (correspond with the well sputtered region by the confined plasma) moves to the centre of the target. The behaviour corresponds with the actually formed film composition. The calculated results also give an information to design the composite target and the correction value for using the already eroded target.

The Application of Magnetic Force Microscopy for Detection of Subsurface Anomalies in Semiconductor Device Wiring Levels

2013 ◽  
Author(s):  
Phil Kaszuba ◽  
Frank Alwine ◽  
Leon Moszkowicz ◽  
Randy Wells
Keyword(s):  
Magnetic Field ◽  
Magnetic Force Microscopy ◽  
Magnetic Force ◽  
Semiconductor Device ◽  
Field Analysis ◽  
Force Microscopy ◽  
Minimal Sample ◽  
Magnetic Field Analysis ◽  
High Lateral Resolution ◽  
The Magnetic Field

Abstract Subsurface wiring level anomalies in VLSI semiconductor devices are extremely difficult, if not impossible to analyze without de-processing the device to expose suspect wiring. Magnetic Force Microscopy (MFM) is a scanning probe technique that requires minimal sample preparation and has the capability to sense magnetic fields in proximity to thin film conductors with high lateral resolution [1]. In this study, multiple VLSI device conductors were intentionally modified and then the magnetic field around the energized conductors was analyzed using MFM. An overview of the technique and results of the magnetic field analysis are discussed.

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