Advanced Materials Research Vols. 466-467

Abstract: This work proposes a dynamic model of a three-phase catalytic slurry intensified continuous reactor. The model is simulated to describe the dynamic behaviors of the hydrogenation of o-cresol on Ni/SiO2 catalyst. The nominal operating point and the transient responses for different input perturbations are discussed.

Abstract: Collagen is a kind of protein which can self-assemble into collagen gel in vitro at 37°C in neutral pH. In this work, collagen is extracted from bovine tendon and characterized by amino acid analysis and sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE). When pH of collagen solution is adjusted to 6.6~6.8 and incubated at 37°C for an hour, collagen molecular can be assembling into gel. As a result, collagen fibers in gel observed form electron microscopic (SEM and TEM) look like natural collagen fiber with cross-grain, which is caused by collage molecular assembly behavior. Then mouse embryonic fibroblasts (3T3 cells) are seeded in the gel. Within a period, state of 3T3 cell living in the 3D gel scaffold is observed. As a result, when collagen solution is mixed with 3T3 cells and incubated in vitro, the gel is formed and provides a three-dimensional space for 3T3 cells proliferation at the same time. This study provides a method to make tissue engineering scaffold with cells in situ and predicts its application in soft tissue defect healing.

Abstract: With the thermal gravity analysis and relative breaking strength test, both crystallization variability and the important temperature is determined in heating process of hemp fibers. Meanwhile, the critical time and temperature is got which have a effect on relative breaking strength of hemp fibres and the hemp fabric appearance. Those data about thermal stability is helpful for hemp manufacturing and processing.

Abstract: Dry process was taken by coarse rubber granule replacing coarse aggregate of the same volume. By an orthogonal experiment, a combined method of vibration compaction and Marshall compaction was used to study main influencing factors on compaction effect of coarse rubber granule asphalt mixture, making voidage as guidepost. The experiment results show that the most prominent influencing factor is rubber content, secondly the influencing factors are compaction temperature, vibration frequency and vibration time, the least is compaction times. An optimal compaction process for the coarse rubber granule asphalt mixture is put forward.

Abstract: Molecular modeling techniques were applied to predicting binding energy for PP/talc and PP-MAH/talc. A supercell containing talc and two polymer chains of 25 repeating units length was constructed. The COMPASS forcefield has been used to represent the interactions in the nanocomposite system. The interactions are improved between the polymer and the clay in the presence of functional groups. And the total energy and potential energy between PP and the talc decreases almost linearly with the simulation time.

Abstract: The deformations and stresses of a concrete face rockfill dam (CFRD) for dam construction and reservoir impoundment were simulated by the element add/remove technique of ABAQUS. And, the sensitivity analysis of main parameters of the Duncan-Chang E-B model was carried out by the method of univariate sensitivity analysis and the critical sensitivity parameters of the deformation and stress on the CFRD were obtained. This research has some guidance and reference for future similar projects design and monitoring.

Abstract: The electrochemical polymerization of 1-hydroxy-2-methoxybenzene (HMOB) was performed in boron trifuoride diethyl etherate (BFEE) and a novel conducting polymer poly(1-hydroxy-2-methoxybenzene) (PHMOB) was easily electrodeposited. The oxidation onset of HMOB was initiated at 0.97 V versus a saturated calomel electrode (SCE). PHMOB films obtained from BFEE showed good thermal stability. NMR studies showed that the polymerization of HMOB occurred at C₄ and C₅ position. Fluorescent spectral studies indicated that doped and dedoped PHMOB were good blue emitters, with the same excitation wavelength maximum of 348 nm.

Abstract: Traditional detection technology of rock cracks in mine is asking somebody to go deep into the mine and detect them. This method doesn’t only waste so much labor force, but also lose timeliness. It will bring amount of risk to the workers and the results will contain subjectivity. As complex texture of rock is similar to the fingerprint, we give a rock fracture recognition algorithm based on fingerprint. In this paper, the fingerprint recognition algorithm is introduced into the rock texture recognition, and to be improved by us. We demonstrate the algorithm is feasibility with experiments.

Abstract: Based on the finite element theory, the infinite plate containing hole is analyzed in the stretching circumstances. The maximum stress was regarded as a random output variable, when the plate length, the plate width, the plate thickness, the elastic modulus, uniform distribution of load and the diameter of the hole were randomized, and were considered as a random input variable. Supposed all input variables are normal distribution. After one hundred times Monto Carlo sampling is implemented, the reliability and sensitivity of infinite plate containing hole can be obtained.

Abstract: The bipolar isothermal quantum drift-diffusion model in two or three space dimensions with initial value and periodic boundary conditions is investigated. The global existence of weak solution to the problem is obtained by using semi-discretizing in time and entropy estimate. Furthermore, it is shown that the solution to the problem exponentially approaches its mean value as time increases to infinity by using a series of inequality technique.