Advanced Materials Research Vol. 421

Abstract: Off-line simulation software of hot strip continuous rolling is developed by taking rolling schedule and strip shape as main modules. Based on theoretical models and modularization design, the simulation system which has friendly interfaces and efficient kernel is established by using Visual Basic as visible platform and C++ as source code language. By contrast, the results calculated by the software are reliable, it adapts to mill types selection and technology quoted of hot rolling. The software improves efficiency for designer and has high practical value.

Abstract: 3D thermal-mechanical coupled numerical simulation of heat pulp mould was carried out. The numerical simulation result shows the rising up process of mould temperature. Temperature distribution contours shows the temperature status on the mould. Temperature distribution results provide reliable guarantee to change the mould structure, so that the temperature distribution on surface becomes uniform. Displacement contours show the mould deformation under the coupled effect of hot temperature and mechanical pressure. The displacement value of nodes can offer reference size to scale mould at the design stage. As a result, high accuracy mould will be manufactured, and this will improve the passing rare of product.

Abstract: In this paper, a 3D-FE model in process of tube bending is built under the ABAQUS/Explicit environment based on the solution of several key techniques, such as contact boundary condition, material properties definition and meshing technology, etc. The results show that both friction coefficients and bending angles have an important influence on the wall thickness of tubes. The variation trends of outside and inside wall thickness are found out by using finite element simulation. The achievements of this study may provide some advice for experiments and manufactures.

Abstract: In order to prevent the activity loss of bromelain activity in the production process, the effect of temperature, pH value and metal ions on bromelain activity of the extraction solution was studied. In the range, inactivation rate of bromelain activity for the extraction solution would be increased significantly when temperature exceeds 60°C. The most suitable for bromelain of casein acids hydrolysate temperature was 50-60°C;the fruit bromelain was stability at original pH value; Fe3+ and Cu2+ can strongly make bromelain reduce activity; at the same time, when the extraction solution diluted times was more than 200 times, bromelain activity didn’t basically changed.

Abstract: PANI-TSA/PA6 core-shell nanofibers were prepared via the electrospinning process with a PA6/formic acid solution and the chemical polymerization of PANI doped with p-toluene sulfonic acid (TSA) on the surface of the PA6 nanofibers. Their structure and morphology were examined by FE-SEM and FTIR and the fabrication mechanism and ammonia sensing properties of the PANI-TSA/PA6 nanofibers were also investigated. All the results showed that, composite nanofibers with PANI-TSA shell and PA6 core had been prepared successfully, which showed a good potential in ammonia sensitivity application.

Abstract: In this work, the cure characteristics of nature rubber (NR) dried by microwave and hot-air were analyzed by using Vulcameter. The effect of curing temperature on induction period (tC10), optimum cure point (tC90), maximum Torque (MH) and minimum induced torque (ML) were studied. The results showed that the tC10, tC90 and ML of NR dried by hot-air were bigger than those of NR dried by microwave, however, the MH of former was bigger. And the tC10, tC90 of NR dried by microwave or hot-air can fitted Arrhenius equation well, the K1, K2 and K of Arrhenius equation coefficient for NR dried by microwave were all bigger than those of NR dried by hot-air. With the increasing of curing temperature, the MH of NR dried by microwave or hot-air decreased gradually and its trend was well satisfied with linear relationship, and the MHo of NR dried by microwave was bigger than hot-air drying.

Abstract: Microwave photonic link (MPL), which processes microwave signal with photonic technologies, has offered many advantages such as increased channel capacity, immunity to RF disturbance, reduction of size and weight, and low loss. External modulation of the MPL applies Mach-Zehnder interferometer (MZI) for the modulating. The traditional phase transitional behavior of the EO device lacks the performances required for quick response, low half-wave voltage V and high loaded power, while maintaining low noise, high SNR, and large dynamic range operation. This paper proposed a method in which the piezoelectric ceramic-based integrated optical waveguide with 3dB loss at the highest power was applied to the MZI. We built the physical model for the phase transitional behavior based on the piezoelectrics, analyzed the piezoelectric properties of ceramics. The impacts of the piezoelectric ceramic on the property of MPL were discussed numerically.

Abstract: Two comb-like polymeric prodrugs of 5-fluorouracil derivatives (p(MAA-PEG400-5Fu), p(MAA-PEG2000-5Fu)) were synthesized from monomers, methacryloyl (polyethylene glycol 5-fluorouracil acetyl) (MAA-PEG-5Fu) through radical polymerization using azobisisobutyronitrile (AIBN) as initiator in N,N-dimethyl formamide solution, which structures were confirmed by means of IR, 1HNMR, UV-Vis, MS and GPC spectroscopy. The drug loading rates of the two prodrugs (p(MAA-PEG400-5Fu), p(MAA-PEG2000-5Fu)) were 25.51%, 10%, respectively.

Abstract: Evolution characteristics of primary phase in A356 alloy at the different isothermal holding temperatures and time were investigated. The results showed that there were the effects of the isothermal holding temperature and time on the evolution of primary phase, and microstructure changed from dendritic-like to rosette-like, and then to particle- or globular-like with the decrease of holding temperature. The suitable technology in the test was obtained, in which when being held at 600°C for 5min, the roundness and size of primary became better.