A single-layer broad-band reflectarray design using dual-frequency phase synthesis method

2012 ◽  
Author(s):  
Yilin Mao ◽  
Cong Wang ◽  
Fan Yang ◽  
Atef. Z. Elsherbeni
Keyword(s):  
Broad Band ◽  
Synthesis Method ◽  
Single Layer ◽  
Dual Frequency ◽  
Phase Synthesis ◽  
Frequency Phase

Particle Morphology of Various SiC-Based Nanocomposite Powders Made by the Aerosol-Assisted Synthesis Method

2008 ◽  
Vol 8 (2) ◽  
pp. 907-913 ◽  
Author(s):  
Cezary Czosnek ◽  
Jerzy F. Janik
Keyword(s):  
Synthesis Method ◽  
Particle Morphology ◽  
Nanocrystalline Silicon ◽  
Carbide Powder ◽  
Excess Carbon ◽  
Phase Synthesis ◽  
Aerosol Generation ◽  
Vapor Phase Synthesis ◽  
Nanocrystalline Silicon Carbide ◽  
Nanocomposite Powders

Herein, we present a part of a study on the preparation of SiC-based composite nanopowders by the two-stage Aerosol-Assisted Vapor Phase Synthesis (AAVS) method from organosilicon precursors (neat hexamethyldisiloxane, neat tetramethoxysilane, ethanol solutions of polydimethylsiloxane). Upon generation, liquid aerosol droplets were transported in a stream of argon through a ceramic reactor tube maintained at 1200 °C. The resulting solid by-products were collected on a nylon filter as bulk powders. Each raw powder was, subsequently, pyrolyzed in a furnace reactor heated to 1650 °C under a flow of argon. After the final pyrolysis at 1650 °C, mostly nanocrystalline silicon carbide powder with small quantities of free excess carbon was obtained from the neat hexamethyldisiloxane system, composite powder of not fully converted silica and SiC was prepared from the neat tetramethoxysilane system, and C-rich/SiC composite was made from the ethanol/polydimethylsiloxane solution system. The prevailing phase of the SiC component was the regular β-SiC polytype. Most of the powders were composed of spheroidal particles – morphology imprinted during aerosol generation at 1200 °C and not much affected by the second-stage bulk pyrolysis at 1650 °C. The specifics of spheroidal morphology were characteristic of the applied precursor system.

scholarly journals Microdroplet synthesis of azo compounds with simple microfluidics-based pH control

RSC Advances ◽  
2020 ◽  
Vol 10 (64) ◽  
pp. 38900-38905
Author(s):  
Daiki Tanaka ◽  
Shunsuke Sawai ◽  
Shohei Hattori ◽  
Yoshito Nozaki ◽  
Dong Hyun Yoon ◽  
...  
Keyword(s):  
Temperature Control ◽  
Synthesis Method ◽  
Ph Control ◽  
Solution Phase ◽  
Azo Compounds ◽  
Phase Synthesis ◽  
Product Removal ◽  
Solution Phase Synthesis ◽  
High Concentrations ◽  
Conventional Solution

Conventional solution-phase synthesis of azo compounds is complicated by the need for precise pH and temperature control, high concentrations of pH control reagents, and by-product removal. The microdroplet synthesis method has solved these problems.

scholarly journals Generation of carbon nanostructures with diverse morphologies by the catalytic aerosol-assisted vapor-phase synthesis method

2015 ◽  
Vol 18 (11) ◽  
pp. 1198-1204 ◽  
Author(s):  
Cezary Czosnek ◽  
Paulina Baran ◽  
Przemysław Grzywacz ◽  
Paweł Baran ◽  
Jerzy F. Janik ◽  
...  
Keyword(s):  
Vapor Phase ◽  
Carbon Nanostructures ◽  
Synthesis Method ◽  
Phase Synthesis ◽  
Vapor Phase Synthesis

Electrical Conductivity of Mixed Conductors (YO1.5)x-(CeO2)y-(ZrO2)1-x-y

2007 ◽  
Vol 336-338 ◽  
pp. 424-427
Author(s):  
Xiang Yong Zhou ◽  
Zeng Fan ◽  
Zi Long Tang ◽  
Zhong Tai Zhang
Keyword(s):  
Electrical Conductivity ◽  
Metal Ion ◽  
Solid Phase ◽  
Electronic Conductivity ◽  
Synthesis Method ◽  
Conductivity Measurement ◽  
Fluorite Structure ◽  
Charge Balance ◽  
Phase Synthesis ◽  
Oxygen Ion

The Y2O3-ZrO2 binary system ceramic is considered to be most developed in application to the ZrO2-based materials. A cubic fluorite structure is generally achieved, as the metal ion of the additive (Y) takes place of the Zr4+ and oxygen ion vacancies are produced in the lattice to maintain the charge balance. This leads to almost totally ionic conductivity. The introduction of changeable valued CeO2 can further improve the total electronic conductivity through the defect equilibrium reaction between tetravalent Ce4+ and trivalent Ce3+ at high temperature and reducing atmosphere. In this study, solid phase synthesis method was employed for the preparation of (YO1.5)x-(CeO2)0.08-(ZrO2)0.9-x and (YO1.5)0.05-(CeO2)y- (ZrO2)0.95-y ceramics, while four probe DC conductivity measurement method was also applied under the temperature between 300 to 800°C. The results prove that the concentration of Y3+ is the main contribution of the electrical conductivity at low temperature.

Optimum Synthesis of Planar Mechanisms for Path Generation Based on a Combined Discrete Fourier Descriptor

2015 ◽  
Vol 7 (4) ◽  
Author(s):  
Wen-Yi Lin
Keyword(s):  
Synthesis Method ◽  
Optimization Method ◽  
Path Generation ◽  
Fourier Descriptor ◽  
Planar Mechanisms ◽  
Two Phase ◽  
Phase Synthesis ◽  
Optimum Synthesis ◽  
Centroid Distance ◽  
The One

A two-phase synthesis method is described, which is capable of solving quite challenging path generation problems. A combined discrete Fourier descriptor (FD) is proposed for shape optimization, and a geometric-based approach is used for the scale–rotation–translation synthesis. The combined discrete FD comprises three shape signatures, i.e., complex coordinates (CCs), centroid distance (CD), and triangular centroid area (TCA), which can capture greater similarity of shape. The genetic algorithm–differential evolution (GA–DE) optimization method is used to solve the optimization problem. The proposed two-phase synthesis method, based on the combined discrete FD, successfully solves the challenging path generation problems with a relatively small number of function evaluations. A more accurate path shape can be obtained using the combined FD than the one-phase synthesis method. The obtained coupler curves approximate the desired paths quite well.

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