Genetic algorithm (GA) is a commonly used algorithm in optical network routing and wavelength assignment (RWA). In order to adapt to the development trend of next-generation software-defined optical network (SDON) with higher speed, wideband, long distance and large capacity, this paper proposes a dynamic, improved GA-based RWA algorithm which reduces the complexity of the algorithm and improves the performance of the algorithm. The simulation results show that the algorithm can effectively reduce the blocking rate and improve resources utilization rate in SDON compared with the classical algorithm and GA.
In order to study the effect of adding hexamethylenetetramine (C6H12N4) on the infrared radiation properties of a mixture decoy of Pb3O4/PTFE/Mg, a formula of Pb3O4/PTFE /Mg = 10: 3: 7 was taken as a basic formula, and different content of C6H12N4 was added in the basic formula to design seven different pharmaceutical formulations. The Combustion process of samples was recorded using a 3-5 micron mid-infrared thermal imager, and the burning time, mass burning rate, radiation area, radiance, as well as the radiation intensity of each sample were calculated. The experimental results show that with the continuous addition of C6H12N4, the combustion temperature of the samples increased firstly and then decreased, besides, the combustion time became longer while the mass burning rate became smaller, when the proportion of additives reached 6%, the temperature came to its maximum of 916.76°C and the radiant brightness was increased from 10956.50 W/m2/Sr to 13517 W/m2/Sr. The longest combustion time was 9.32s with the lowest mass burning rate of 1.72g/s when the proportion of additives reached 15%. And the radiation intensity was increased from 1079.05W/Sr to 1254.1W/Sr when the proportion of additives reached 9%. This showed that the appropriate addition of 6% to 9% of C6H12N4 in the basic formulation contributes to the improvement of the combustion performance and radiation performance of the Pb3O4/Mg/PTFE decoy.
In order to verify the heat dissipation characteristics of selective low emissivity materials, the traditional low emissivity materials and selective low emissivity materials were coated on the oxidized steel surface, and the heat transfer model between the target and the dark room was established. Finally, the heat dissipation characteristics of selective low emissivity materials were simulated, and the effects of the emissivity and the darkroom temperature on the heat dissipation characteristics of selective low emissivity materials were analyzed. The results showed that for high temperature targets, selective low emissivity materials had better heat dissipation characteristics than traditional low emissivity materials. The lower the emissivity in mid-far infrared bands, the better the heat dissipation characteristics of selective low emissivity materials. When the ambient temperature of the dark room fell from 30°C to -30°C, the lower the temperature, the better heat dissipation characteristics of selective low emissivity materials.
As a kind of special electromagnetic medium, femtosecond laser plasma has the potential of transmitting the electromagnetic wave. In this paper, a theoretical study on 6 GHz EM wave guiding performance of the plasma filament is carried out with the software XFDTD. Then, an experimental setup for the interaction between the EM wave and the plasma filaments is established. Based on the data measured by oscilloscope, the transmission properties of the EM wave along the filament are obtained. The results show the electric field is enhanced out of the waveguide with the plasma filament. The guiding performance of the plasma filament on the TE polarization wave is better than that on the TM one, which is consistent with the experimental results. For TE polarization wave, the plasma filament can reduce the transmission pulse energy greatly and the attenuation is up to 3.5 dB in the experiment. The research results show that the laser plasma filament can provide efficient transmission of the EM wave energy.
Strong electromagnetic pulse (EMP) may lead to serious damage once it is coupled into the interior of the electronic system. As a kind of special electromagnetic medium, plasma has the ability of shielding strong EMP. Therefore, EMP protection technology based on the plasma is of pratical significance. The experimental setup of the interaction between the nuclear electromagnetic pulse (NEMP) and the plasma based on a one-layer cylindrical plasma array is built. Combined with the density distribution characteristics, the protection performance of the plasma array against the NEMP is studied. The results indicate that the protection performance of the plasma array against the TE polarization NEMP is better than that against the TM one. For both TE and TM polarization NEMP, the one-layer cylindrical plasma array can reduce the transmission pulse energy greatly and the energy attenuation is up to 10dB when the electron density is 8.5×1016 m-3.
In order to study the effect of the ratio of oxidizing agent to reducing agent on the performance of the trilead tetraoxide/ Teflon/magnesium (Pb3O4/PTFE/Mg) powder decoy compounding agent, 5 different pharmaceutical formulations are designed by maintaining constant oxidant formula and changing the ratio of oxidant agent and reducing agent. Then the mixed powder is pressed into a powder by a table press. The combustion process of the drug column was measured with an 8-14 micron infrared thermal imager, and the burning time, mass burning rate, radiation area, radiance, and radiation intensity of each sample were calculated. The results show that with the increase of the proportion of reducing agent, the burninging time of the sample becomes shorter and the mass burninging rate becomes larger. The maximum temperature of the flame increased with the proportion of reducing agent first and then decreased. When the ratio of oxidant agent to reducing agent is 1.5:1, the maximum temperature of sample combustion reaches a maximum of 1503°C. The radiance increases first and then decreases with increasing proportion of reducing agent, and When the ratio of oxidant agent to reducing agent is 1:1.5, the infrared radiance is the maximum, which is 2510 W·m-2·Sr-1.Radiation intensity increases as the proportion of reducing agent increases. It can be seen that in the 8-14 micron band, when the ratio of oxidant agent to reducing agent is 1:1.5, the radiation characteristics of the sample is best and the sample is the best one as infrared decoy.