Advanced Materials Research Vol. 1046

Abstract: A batch of operating parameters which need to be resolved on line are represented by operating modes.Operating mode optimization for copper flash smelting process based on fuzzy neural networks is presented. First of all, the optimal samples set is screened from the historical samples set. Then mode decomposition based on fuzzy neural networks is used, and chaos genetic algorithm is used to rake the optimal operating sub-pattern.This way is used to copper flash smelting process.The simulation result shows that this way can guide production.

Abstract: The effect of artificial aging on the corrosion resistance of 2024 Al alloy was investigated by field emission scanning electron microscope (FE-SEM) and accelerated corrosion test. For comparison, the solution treatment followed by air-cooled and water-quenched samples were also researched. Accelerated corrosion test revealed that the corrosion resistance of the alloy strongly depended on artificial aging times, and the weight gain of the aged alloy increased first and then decreased with increasing the aging times, and a maximum value was found at peak aged condition. The air-cooled sample had the highest weight gain while the water-quenched one had the lowest weight gain among all the samples. The corrosion morphologies showed that pitting and localized intergranular corrosion were the main corrosion forms for the air-cooled and aged 2024 Al alloys. However, only pitting corrosion took place on the water-quenched samples. The pitting and intergranular corrosion resulted from galvanic corrosion between secondary particles and matrix Al, and between grain boundary precipitates and matrix Al, respectively.

Abstract: The effect of artificial aging on the corrosion properties of 6063 Al alloy was investigated by optical microscope, field emission scanning electron microscope (FE-SEM) and accelerated corrosion test. Accelerated corrosion test revealed that the corrosion resistance of the alloy strongly depended on artificial aging times, and the corrosion weight gain curve of the aged alloy was greatly in agreement with that of hardness vs. aging times, showing that the lowest corrosion resistance was exhibited at peak aged condition. It is found that pitting is the main corrosion form for the 6063 aluminum alloy aged with different times at 210°C, and slight intergranular corrosion is also found at peak hardness. It is believed that pitting results from galvanic corrosion between Al₉Fe₂Si₂ particles and matrix Al while intergranular corrosion results from galvanic corrosion between Mg₂Si and matrix Al.

Abstract: Ni60 self-fluxed alloy powder was coated on the surface of Q235 steel plate by the ultrasonic-assisted argon-arc clad injection technology, then TiC, TiN and Co powder were sprayed by the modificated injection device, and at the same time the powder was vibrated by the ultrasonic-assisted vibration device self-designed. The results shows that through the innovative technology, the wettability and dispersity of the reinforced phase are ameliorated, so as the elements diffusion and binding strength of the cladding layer with the matrix. The microhardness of the composite coating is 1.1 times than that of the coating without ultrasonic assisted, and 4.8 times than Q235 as the matrix. The wear resistance of the composite coating is 11 times than Q235, and 1.6 times than that of the coating without ultrasonic assisted.

Abstract: The paper studied the friction and wear performances of n-Na₂B₄O₇/ion nitrocarburized duplex layer at different frequences. It is found that at frequence 10 Hz, 20 Hz, 30 Hz, respectively, the friction factor and volume loss of the duplex layer is 64%, 60%, 50% and 97%, 91%, 95% less than that of the intermediate frequency quenched surface, respectively, which indicates that the n-Na₂B₄O₇/ion nitrocarburized duplex layer has more excellent friction reduction and wear resistance performances than the intermediate frequency quenched surface under CD15W-40 oil lubricating at different frequences. This because that the chemical reaction films including oxide, BN and so on formed on the friction surface play the solid lubrication function, and the n-Na₂B₄O₇ particles on the friction surface play the "Micron nanobearing" function.

Abstract: Waste explosives are dangerous marerials and the traditional approaches did not only waste resources, but also caused environment pollution. Separation and recovery can effectively make up the shortage of traditional processing methods. The domestic hybrid methods of separating and recovering explosives are summarized and proposed industrial development direction of separation and recovery of waste explosives is the proper way to dispose discarded or obsolete TNT/RDX/Al explosive.

Abstract: Aniline is considered as an environment hazard. Aniline-containing wastewater frequently has elevated salinity and high pH, which is generally not degraded by neutrophilic bacteria. The research explored the degradation ability of aniline by the novel isolated bacterial strain under alkaline and hyperhaline conditions. The strain was designated Bacillus sp. AN2 based on 16S rDNA sequence and Biolog Microstation Identification System. This strain had an unusually high salinity tolerance in minimal medium (0-6% NaCl, w/v). The optimal pH for microbial growth and aniline biodegradation was pH 9.0. For the initial concentrations of 200, 500, and 800 mgL^-1, 95%, 74% and 62% of the aniline was degraded, respectively. The results suggest that the strain has potential for aniline degradation under alkaline and elevated salinity environmental conditions.

Abstract: In this paper, the thermal equation of state (EOS) of (Mg_0.92, Fe_0.08)SiO₃ is computed by Birch-Murnaghan and Mie-Grüneisen-Debye equations and the related parameters are also analyzed. The value of and has little effect on EOS of (Mg_0.92, Fe_0.08)SiO₃ perovskite. The effect of EOS of (Mg_0.92, Fe_0.08)SiO₃ perovskite is mainly from the temperature under high pressure. The temperature is higher; the deviation of EOS relative to the PREM model is bigger. The thermal EOS complies with PREM model at T=2000K. The thermal pressure of (Mg_0.92, Fe_0.08)SiO₃ perovskite a constant only related to temperature at the lower mantle conditions. At the same time, the EOS of (Mg_0.92, Fe_0.08)SiO₃ perovskite is insensitive to the data of and at T=2000K, but when and the thermal EOS is more agreement with PREM model. That is to say, when the value of the and is in the range of 253~273 GPa and 3.69~4.23, (Mg_0.92, Fe_0.08)SiO₃ is the perovskite phase, and (Mg_0.92, Fe_0.08)SiO₃ perovskite structure remains stable at the mantle conditions.

Abstract: In response to the problem of mental or physical disorders due to the pace of modern busy life, the heart rate variability analysis is often used as an indicator for assessment. This study indicates the use of electrocardiogram (ECG) and photoplethysmograph (PPG) to capture the heart rate and conduct heart rate variability comparative analysis. We want to use photoplethysmograph to replace ECG for retrieving heart rate of patients. In our experiment, the first observation is to record the autonomic nervous system modulation caused by listening to music with different rhythms and doing exercise. Then we observe the correlation among different heart rate variability under different physical conditions after that. According to the results of the analysis shown that PPG calculated heart rate variability signals are highly related to the results obtained by ECG.

Abstract: Generally, the effect of cell image that segmented via the threshold value method is not ideal generally; the found cell boundary cannot conform to the cell edge in the original picture well. In this paper, the threshold value segmentation method is improved; apply the judging criterion of gray level difference maximum interval to be the minimum, and conduct secondary treating on the image, and the image’s segmentation effect is more ideal.