Applied Mechanics and Materials Vols. 217-219

Abstract: Thermal analysis tests of residual sludge and digested sludge were performed on a thermogravimetric-differential thermal (TG-DTA) integrated thermal analysis instrument at the same heating rate. By doing this, the purpose is to understand the sludge pyrolytic law, to determine the optimal drying temperature for retaining the most calorific value of sludge, and to provide the basis to the sludge thermal drying treatment. The results show that the loss of organic matter in the digested sludge and excess sludge is smaller at the drying temperature of not higher than 250°C, and the optimal drying temperature of excess sludge may be slightly higher.

Abstract: Magnetic photocatalystic particles (MPCs) become an alternative process for water and wastewater treatment due to the high removal rate of organic pollutants and a good recovery. Little information of MPCs on the control of microorganisms was obtained in previous researches. In this study, the synthesized MPCs combined with 365 nm UVA irradiation under a light of 1.0 mW/cm² were applied to control a typical gram-negative strain Staphylococcus sciuri (99% Identified by the NCBI website), which was isolated from an indoor traditional market in the middle area of Taiwan. As a result, the highest bactericidal efficiency (BE) of MPCs contained 0.50 g magnetic particles in nutrient broth was achieved to 68.18% at 50 mins. Considering to each contribution of bacterial control, UVA irradiation played an important role of BE increased from 34.88% at 10 mins to 63.64% at 50 mins. Photocatalystic reaction provided extra more 11.02% of BE at initial 20 mins. The synthesized MPCs demonstrated good crystallinity of anatase by SEM-EDS and XRF. The 76% MPCs can be recovered by simple magnets after photocatalystic reaction.

Abstract: With the miniaturization of portable products, integrate circuit becomes thinner, the effect of warpage on Package-on-Package (POP) stacking assemble on integrate circuit have become more distinct. It will lead to the deformation of the chip substrate and the more serious effectiveness of the solder joint. Consequently, in this paper, a novel method by adding fixed metal pillars in the middle of POP stacking substrates can well suppress warpage problems caused by the uneven heating reflow materials. Finally, this new method is feasible by analyzing the stress of warp model.

Abstract: Soil pollution is the important part of environmental pollution which affects the quality of agricultural products and safety of human health. taking Poyang Lake Ecological Economic Zone as the specific study object, on the basis of an overview of soil pollution status quo in the area, the soil pollution prevention plan of Poyang Lake Ecological Economic Zone was probed into which included the guiding ideology and principles, the planning target and indicators, soil function zoning, planning content and planning measures, while the planning content includes emphasis content plan of agricultural soil pollution prevention and contaminated sites ecological restoration, emphasis pollutants plan, emphasis regional plan, emphasis industries plan and emphasis project plan. It can improve the soil environment quality of Poyang Lake ecological Economic Zone to provide environmental guarantee for sustained and healthy development in the area.

Abstract: In the paper, technological conditions suitable for H2O2 strengthened oxygen delignification of fast growing poplar NaOH-AQ pulp with low kappa number (Kappa number 13.5, viscosity 851ml/g, brightness37%ISO) were investigated, based on which (Q/OP) QP Totally Chlorine Free (TCF) bleaching sequence was studied, and the TCF high-brightness bleaching of NaOH-AQ pulp with low kappa number was realized. Conditions better suitable for (Q/OP)QP bleaching of NaOH-AQ pulp with low kappa number are as follows: at the stage of H2O2 strengthened oxygen delignification: pulp consistency 10%, alkali dosage 2.5%, H2O2 dosage 3%, MgSO4 dosage 0.5%, oxygen pressure 0.6Mp, temperature 100°C, time 60min; at Q stage: pulp consistency 8%, DTPA 0.3%, initial pH value 4, temperature 70°C, time 120min; at P stage: pulp consistency 10%,H2O2 dosage 2%, MgSO4 dosage 0.5%, Na2SiO3 dosage 0.7％, temperature 70°C, pH value 12, time 120min. With this sequence, the pulp can be bleached with brightness of 82.0%ISO, viscosity 716ml/g, and the bleached pulp yield ratio 91.78％.

Abstract: Use single and coexistence of simulated mine water contains Fe2+ and Mn2+ as processing object, the new NWMO medicament on Fe2+ and Mn2+’s removal efficiency, NWMO dosage, pH, reaction time and temperature on NWMO’s removal efficiency were investigated. When treated mine water only contains Fe2+, the appropriate conditions of the factors are that NWMO dosage/Fe2+ content=19:1, pH=5, room temperature, the reaction time is 10min, and the removal rate of Fe2+ is more than 80%; When treated mine water only contains Mn2+, the appropriate conditions of the factors are that NWMO dosage/Mn2+ content=22:1, pH=6, 35°C, the reaction time is 10min, the removal rate of Mn2+ is more than 60%; When the processing of Fe2+ and Mn2+ coexistence of mine water, the appropriate conditions of the factors are that NWMO dosage/Fe2+content=19:1, Fe2+ content/Mn2+ content=5:1, pH=6, 35°C, the reaction time is 10min, the removal rate of Fe2+ can be as high as 100%, and the highest Mn2+ removal rate can amount to 75%. In view of the current mine water quality characteristics that contains Fe2+ and Mn2+, the NWMO medicament is very suitable, and can achieve quick and efficient removal of iron and manganese.

Abstract: paper formation, smoothness, bulk, ink absorption, printability. Abstract. The impact of the paper formation on smoothness, compressibility, uniform of ink absorption is discussed in this paper. The experimental esults indicate that the paper with bad formation leads to higher apparent bulk, and the paper with bad formation shows nonuniform calendering and low compressibility. The bad formation of paper also results in deformation and omission of printing dots, which affects directly the reproduction of the printing images.

Abstract: In this paper, CeVO₄/TiO₂ composite photocatalyst has been characterized by photoelectrochemical and reactive oxygen species trap techniques to reveal the mechanism for photocatalytic degradation of VOCs in gas-phase. Based on the measurement of flatband of the samples and the detection of reactive oxygen species, a visible light-induced photocatalytic degradation mechanism of VOCs on CeVO₄/TiO₂ is proposed.

Abstract: N-doped mesoporous TiO2 with high surface area and crystallinity were synthesized by sol-gel method using polyacrylamide (PAM) and polyethylene glycol (PEG) as the complex templates. The resulting materials were characterized by XRD, TEM, N2 adsorption-desorption, and UV-Vis spectroscopy. It is found that when the weight ratio of PAM and PEG is 1:4, the sample, prepared at 600 °C in nitrogen and at 500 °C in air, is anatase phase and has high surface area and crystallinity. The particle size and pore size of the sample are about 10 nm and 17 nm respectively. Compared with that of the undoped mesoporous TiO2, the absorption band edges of N-doped samples exhibit an evident red-shift. The results of the photocatalytic degradation of methyl orange (MO) show that N-doped sample appears to have higher photocatalytic activity under visible light than undoped sample.

Abstract: The feasibility of using honeycomb-cinder slag as an adsorbent for phosphate removal from aqueous solution was investigated in batch experiments as a function of initial pH, contact time, adsorbent dose, and solution temperature. The results indicated that the solution pH significantly influenced the phosphate adsorption; 1440 min was enough to reach equilibrium for any concentration. Langmuir isotherm model gave well fit for phosphate adsorption, and the adsorption process followed pseudo second-order model. Desorption study exhibited that the phosphate adsorption on the honeycomb-cinder slag is not completely reversible. Results showed that honeycomb-cinder slag could be used as an adsorbent to uptake phosphate from wastewater.