scholarly journals Formation of Fe-Ni Nanoparticle Strands in Macroscopic Polymer Composites: Experiment and Simulation

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 2095
Author(s):  
Ruksan Nadarajah ◽  
Leyla Tasdemir ◽  
Christian Thiel ◽  
Soma Salamon ◽  
Anna S. Semisalova ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Size Composition ◽  
Optimal Parameters ◽  
Critical Dimensions ◽  
Composite Fabrication ◽  
Extrinsic Parameters ◽  
Length Width ◽  
Intrinsic And Extrinsic Parameters ◽  
Magnetically Aligned ◽  
Enhanced Conductivity

Magnetic-field-induced strand formation of ferromagnetic Fe-Ni nanoparticles in a PMMA-matrix is correlated with the intrinsic material parameters, such as magnetization, particle size, composition, and extrinsic parameters, including magnetic field strength and viscosity. Since various factors can influence strand formation, understanding the composite fabrication process that maintains the strand lengths of Fe-Ni in the generated structures is a fundamental step in predicting the resulting structures. Hence, the critical dimensions of the strands (length, width, spacing, and aspect ratio) are investigated in the experiments and simulated via different intrinsic and extrinsic parameters. Optimal parameters were found by optical microscopy measurements and finite-element simulations using COMSOL for strand formation of Fe50Ni50 nanoparticles. The anisotropic behavior of the aligned strands was successfully characterized through magnetometry measurements. Compared to the unaligned samples, the magnetically aligned strands exhibit enhanced conductivity, increasing the current by a factor of 1000.

scholarly journals New possibilities of collectors with azimuthal magnetic field for multistage energy recovery in gyrotrons

2021 ◽  
Vol 2103 (1) ◽  
pp. 012058
Author(s):  
I Louksha ◽  
P A Trofimov ◽  
B D Usherenko
Keyword(s):  
Magnetic Field ◽  
Electron Beam ◽  
Energy Recovery ◽  
Trajectory Analysis ◽  
Spatial Separation ◽  
Total Efficiency ◽  
Optimal Parameters ◽  
Azimuthal Magnetic Field ◽  
Electron Trajectories ◽  
Collector Region

Abstract The results of modeling a collector with 4-stage recovery of residual electron energy for the SPbPU gyrotron with a frequency of 74.2 GHz and an output power of 100 kW are presented. For spatial separation of electrons with different energies, an azimuthal magnetic field created by a toroidal solenoid is used. An increase of the recovery efficiency and a decrease of the current of electrons reflected from the collector is achieved by reducing the spread of the radial position of the leading centers of electron trajectories at optimal parameters of the toroidal solenoid, as well as by using a sectioned electron beam. The trajectory analysis of the spent electron beam in the collector region showed the possibility of achieving the total efficiency of the gyrotron, close to 80%.

Synthesis of FeCo alloy magnetically aligned linear chains by the polyol process: structural and magnetic characterization

2015 ◽  
Vol 3 (42) ◽  
pp. 11029-11035 ◽  
Author(s):  
Dustin M. Clifford ◽  
Carlos E. Castano ◽  
Amos J. Lu ◽  
Everett E. Carpenter
Keyword(s):  
Magnetic Field ◽  
Precipitation Chemistry ◽  
Feco Alloy ◽  
Magnetic Characterization ◽  
Magnetic Switching ◽  
Linear Chains ◽  
Absorbing Materials ◽  
Co Precipitation ◽  
Magnetically Aligned ◽  
Dynamic Magnetic Field

FeCo magnetically aligned linear chains (MALCs) were synthesized using polyol based co-precipitation chemistry under an external dynamic magnetic field and are potential candidates for magnetic switching devices and radar absorbing materials (RAMs).

scholarly journals Observations of Orion Molecular Cloud with NMA

1994 ◽  
Vol 140 ◽  
pp. 185-189
Author(s):  
Y. Murata ◽  
R. Kawabe ◽  
M. Ishiguro ◽  
K.-I. Morita ◽  
T. Hasegawa ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Molecular Cloud ◽  
Gas Flow ◽  
Position Angle ◽  
Aperture Synthesis ◽  
Width Ratio ◽  
Length Width ◽  
The Magnetic Field

AbstractWe have made aperture synthesis multifield observations of Orion Molecular Cloud-1 (OMC-1) in the CS (J=1-0) line using the Nobeyama Millimeter Array (NMA), and obtained 9” resolution maps over 10’ length. The OMC-1 ridge shows a wiggled structure. The position angle of whole the ridge is ~ 0° - 10°, but ~ 20° - 30°around the clumps. It is possible to make this structure by the magnetic field with a position angle of ~ 150°. We also found filamentary structures in the northwest of Orion-KL, with a length-width ratio of more than 25, which are made by the gas flow from Orion-KL.

scholarly journals The Magnetic Field in the Perseus Molecular Cloud Complex

1990 ◽  
Vol 140 ◽  
pp. 319-320
Author(s):  
A.A. Goodman ◽  
P.C. Myers ◽  
P. Bastien ◽  
R.M. Crutcher ◽  
C. Heiles ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Molecular Cloud ◽  
Molecular Clouds ◽  
Dust Grains ◽  
Magnetically Aligned ◽  
Cloud Complex ◽  
The Magnetic Field ◽  
Co Emission ◽  
Selective Extinction

In Figure 1, we present a map of the polarization of background starlight in the Perseus region (Goodman, Bastien, Myers, and Menard 1989) superposed on contours of integrated 13CO emission (Bachiller and Cernicharo 1986). The polarization vectors map the plane-of-the-sky field (B⊥), assuming as usual that the observed polarization is the result of selective extinction by magnetically aligned dust grains associated with the molecular clouds between the observer and background stars (e.g. Dolginov 1989).

scholarly journals The Influence of Light Irradiation on the Photocatalytic Degradation of Organic Pollutants

Materials ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2494
Author(s):  
Alexandru Enesca ◽  
Luminita Isac
Keyword(s):  
Tin Oxide ◽  
Photon Flux ◽  
Photocatalytic Efficiency ◽  
Photocatalytic Process ◽  
Kinetic Evaluation ◽  
Conductive Substrate ◽  
Extrinsic Parameters ◽  
Total Irradiance ◽  
Overall Efficiency ◽  
Intrinsic And Extrinsic Parameters

The design of a photocatalytic process must consider intrinsic and extrinsic parameters affecting its overall efficiency. This study aims to outline the importance of balancing several factors, such as radiation source, total irradiance, photon flux, catalyst substrate, and pollutant type in order to optimize the photocatalytic efficiency. Titanium oxide was deposed by the doctor blade technique on three substrates (microscopic glass (G), flour-doped tin oxide (FTO), and aluminum (Al)), and the photocatalytic properties of the samples were tested on two pollutants (tartrazine (Tr) and acetamiprid (Apd)). Seven irradiation scenarios were tested using different ratios of UV-A, UV-B + C, and Vis radiations. The results indicated that the presence of a conductive substrate and a suitable ratio of UV-A and Vis radiations could increase the photocatalytic efficiency of the samples. Higher efficiencies were obtained for the sample Ti_FTO (58.3% for Tr and 70.8% for Apd) and the sample Ti_Al (63.8% for Tr and 82.3% for Apd) using a mixture of three UV-A and one Vis sources (13.5 W/m2 and 41.85 μmol/(m2·s)). A kinetic evaluation revealed two different mechanisms of reaction: (a) a one-interval mechanism related to Apd removal by Ti_FTO, Ti_Al (scenarios 1, 4, 5, and 7), and Ti_G samples (scenario 7) and (b) a two-interval mechanism in all other cases.

scholarly journals A Structured Light RGB-D Camera System for Accurate Depth Measurement

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Van Luan Tran ◽  
Huei-Yung Lin
Keyword(s):  
Template Matching ◽  
Structured Light ◽  
Gray Code ◽  
Object Surface ◽  
Camera System ◽  
3D Vision ◽  
Depth Measurement ◽  
Sensing System ◽  
Extrinsic Parameters ◽  
Intrinsic And Extrinsic Parameters

The ability to reliably measure the depth of the object surface is very important in a range of high-value industries. With the development of 3D vision techniques, RGB-D cameras have been widely used to perform the 6D pose estimation of target objects for a robotic manipulator. Many applications require accurate shape measurements of the objects for 3D template matching. In this work, we develop an RGB-D camera based on the structured light technique with gray-code coding. The intrinsic and extrinsic parameters of the camera system are determined by a calibration process. 3D reconstruction of the object surface is based on the ray triangulation principle. We construct an RGB-D sensing system with an industrial camera and a digital light projector. In the experiments, real-world objects are used to test the feasibility of the proposed technique. The evaluation carried out using planar objects has demonstrated the accuracy of our RGB-D depth measurement system.

A Camera Calibration Method Based on Plane Grid Points

2011 ◽  
Vol 230-232 ◽  
pp. 723-727 ◽  
Author(s):  
Bao Feng Zhang ◽  
Xiu Zhen Tian ◽  
Xiao Ling Zhang
Keyword(s):  
Camera Calibration ◽  
Model Calibration ◽  
Calibration Method ◽  
Translation Vector ◽  
Plane Model ◽  
Extrinsic Parameters ◽  
Computer Vision Systems ◽  
Grid Points ◽  
Intrinsic And Extrinsic Parameters ◽  
Plane Grid

In order to simplify previous camera calibration method, this paper put forward an easy camera calibration method based on plane grid points on the foundation of Heikkila plane model calibration method. Intrinsic and extrinsic parameters of the camera are calibrated with MATLAB, then the rotation matrix and the translation vector are calculated. The experiment results show this method is not only simple in practice, but also can meet the needs of computer vision systems.

Intrinsic and Extrinsic Parameters for Controlling the Growth of Organic Single-Crystalline Nanopillars in Photovoltaics

Nano Letters ◽  
2014 ◽  
Vol 14 (10) ◽  
pp. 5547-5554 ◽  
Author(s):  
Yue Zhang ◽  
Ying Diao ◽  
Hyunbok Lee ◽  
Timothy J. Mirabito ◽  
Richard W. Johnson ◽  
...  
Keyword(s):  
Single Crystalline ◽  
Extrinsic Parameters ◽  
Intrinsic And Extrinsic Parameters
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