Applied Mechanics and Materials Vol. 312

Abstract: A storage study of litchi juice packed in glass bottles and plastic pouches at 40°C to analyze effects of packaging material on ascorbic acid, browning and total phenol in litchi juice. The initial concentration of ascorbic acid in litchi juice was150.74mg/L and this was found to decrease by 30.56 and 26.12 mg/L after six weeks in glass bottles and plastic pouches. Dissolved oxygen concentration of litchi juice was decreased continuously in glass bottles and decreased fast first, then increased slowly in plastic pouches. Total phenol of litchi juice packed in glass bottles and plastic pouches decreased continuously. Litchi juice non-enzymatic browning attributed to ascorbic acid degradation, maillard reactions and polyphenol oxidation polymerization. The oxygen which permeated through plastic packaging material and dissolved in litchi juice promoted ascorbic acid degradation.

Abstract: β-Methylhydrogen itaconate was synthesized with itaconic acid and methyl alcohol and using benzoyl chloride as catalyst. The important variables (reaction temperature, reaction time and substrate mole ratio) were optimized by Box-Behnken central composite design under response surface methodology. The statistical analysis showed that the optimum reaction conditions (temperature 58.98 °C, time 0.5 h and substrate molar ratio 3.71) led to a maximum yield (99.2%).

Abstract: Computation Fluid Dynamics (CFD) has been employed to calculate the pressure, flow distributions and leakage of brush seal by using Reynolds-Averaged-Navier-Stokes (RANS) method and two-dimensional axisymmetric anisotropic porous medium model. The leakage in brush seal with radial clearance has a marked increase compared with contact brush seal. The leakages of brush seal with different radial clearances have been investigated comparing contact brush seal. A type ofretaining ring structure has been employedto reduce the leakage on radial clearance condition. Also the disturbance effect of retaining ring on bristle pack has been studied.

Abstract: The preparation method of the superhydrophobic surface on aluminum alloys was investigated, the method is novel by phosphoric acid-dichromate process and stearic acid coating, superhydrophobic aluminum alloy surfaces were successful prepared, the maximum static water contact angle and sliding angle on the superhydrophobic surface was 151±1.8° and 10°, respectively. In this work, the microstructure and self-cleaning properties of the superhydrophobic surface were studied. The superhydrophobic surface is a factor to reduce device-associated contamination and can be used in metal packaging practice.

Abstract: For uneven temperature distribution of infrared hot recycling of asphalt mixtures, principle and advantage of microwave hot recycling are introduced. Maxwell's equations are applied to build electromagnetic transmission model of recycled asphalt mixtures. Considering asphalt mixtures as dielectric substance, reflection and refraction of electromagnetic field are researched and model of standing wave ratio is built. Equation of magnetic attenuation is applied to contrast attenuation depths of different pavement materials. The results lay a good theoretical foundation to improve heating efficiency and choose pavement materials.

Abstract: This research aims to estimate the optical property of touch panel (TP) with different layers coating. The neural network (NN) model is used to catch the complex relationship among the chromatic aberration, i.e. L. a. b. values, and their relevant influencing factors. An artificial intelligent (AI) estimator is expected to be developed so that the optical property of TP decoration film with different layers coating could be precisely estimated before the evaporation process is taken. Such an AI estimator can help the technician to set the control parameters of evaporator in advance and make the films optical property could fit the customers request. From the simulation results shown, the estimations of chromatic aberration of TP film are very accurate. In other words, such an AI estimator is possibly to be developed and it is quite promising and potential in the real industrial applications.

Abstract: Multi-layer piezoelectric thin-film substrates which may present properties of good temperature characteristic, high reflectivity, high coupling coefficient, high phase velocity, and integrated with semiconductor, have the potential to replace single crystal piezoelectric substrates used on acoustic devices. The properties of piezoelectric thin-film substrates are determined by the structures of the substrates, the piezoelectric material, the metal film thickness and etc. Usually the acoustic wave parameters of the substrates are not readily obtainable from literature. In this paper, the acoustic wave properties of thin film substrate of AlN/Diamond/Silicon were analyzed using finite element method. The research data of this paper would be applied to design high frequency RF acoustic devices such as resonators and filters.

Abstract: The migration behavior of UV ink photoinitiators from the substance of the food packaging to the food is simulated by photoinitiator spectrometry analysis. The different food simulants 10% ethanol, 95% ethanol and 97% isooctane migration behavior of the photoinitiators 1-Hydroxycyclohexyl phenyl ketone (184) are simulated on the polyethylene (PE) coated paper 4018,4025 and 4918 PE coated layer at different temperatures of 30°C, 45°C and 60°C. The qualitative and quantitative analysis is done using infrared spectroscopy and ultraviolet spectrophotometry. It is discussed that the effect of the temperature, swelling, PE lamination layer thickness as well as the paper thickness of pollutants by the different thickness of the polymer coating on the migration to food simulants.

Abstract: Zinc oxide (ZnO) the film is a new type of transparent conductive oxides (TCO) material; it has a green environmental application prospect and hopeful to be substitution of indium tin oxide, so it has been the research focus of TCO materials. The rare earth ion like Yb³⁺, and Ho³⁺, Er³⁺ shall be applied to satisfy the up-conversion function, and rare earth elements doped ZnO transparent conductive films will prepared. The play is to study the mechanism of up-conversion and energy transitions that the rare earth ions in the ZnO transparent conductive film. Through the theoretical analysis with the performance of the zinc oxide thin films explore optimization scheme, and aim to prepare out doped-ZnO and transparent conductive film that have both excellent photoelectric performance and up-conversion function. This new type of ZnO transparent conductive film with up-conversion function, it will have important theoretical significance in production of green environment materials and good application prospect in the field of sole cells, photoelectric detection luminescent device and so on.

Abstract: This study used ordinary portland cement of 42.5 strength grade, mixed with various minerals and water reducer for the preparation of concrete C30 by means of four schemes, for each of which a specific mix proportion was employed. Accordingly the compressive strength of concrete with different preparations at different ages were compared. No matter which scheme was employed, single or double doping, with or without superplasticizer, the compressive strength of concrete at different ages was maximized when slag amount was 30% or maximum. Hence it can be concluded that the reasonable content of slag should be 30% for the preparation of concrete C30. It is suggested that the above results can be better applied to large-volume concrete, underground, harbor, road and bridge and civil engineering as well.