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Ethyl-cyanoethyl cellulose ((E-CE)C) forms cholesteric liquid crystals in acrylic acid (AA) and the cholesteric order in the solutions can be frozen when the AA is quickly polymerized but the cholesteric structure is changed after the polymerization though the property of the selective reflection is reserved. The maximum wavelength of the selective reflection of the cholesteric phase λ ma...
Various methods to characterize the pore size and pore size distribution of hollow-fiber porous filtration membranes were reviewed. First, the microscopy observation method, which was the most direct method to characterize the membrane pore structure, was reviewed. Second, the thermoporometry method and a method based on water permeability were reviewed. The last method, which relates to solute...
This paper describes a digital simulation on a typical IEEE thirteen-machine system. Four different excitation control approaches are emphatically compared in their control effectiveness to different disturbances. The simulation results indicate that the nonlinear excitation control approach has obvious advantages over the other three control ones.
The optical control of the distributed electronics in phased array antennas requires specialized circuits which are compatible with the T/R level data mixing architecture. This paper presents an analytical modeling of a novel circuit, a push-pull self-oscillating mixer, that can perform three important functions: 1) oscillation, 2) frequency and phase locking to a reference signal, and 3) mixing with...
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