Advanced Materials Research Vol. 740

Abstract: Computational fluid dynamics is a blanch of hydromechanics which is used to analyze the properties and heat transfer for different flows. With the developments of the computer science and CFD software itself, CFD has been applied into every field in engineering which can save the cost and time of research. This article simulated three different temperatures (85°C, 88°C, 90°C) of pasteurization to orange juice and got the temperature field in each pasteurization temperature After compared with the experimental data, the simulation model was improved and optimal computational way was got finally.

Abstract: In order to get the displacement response curve of the Portal Crane under four phase of unloading process, the vibration system was built, the vibration differential equation and displacement response expression were deduced, combining with the actual case, the displacement response expression and displacement response curve were deduced in the open grab time 1.5 s and 4 s. The results show that: the unloading process is an important factor affecting the structural vibration; Displacement peak and open grab time are inversely proportional; Increase the open grab time can reduce the vibration of the structure.

Abstract: The purpose of this study is to compare the estimation on latent trait between fuzzy regression and traditional regression. It is assumed that manifest data from fuzzy linguistic questionnaire and traditional questionnaire is used to estimate the latent trait of task-taker. Two kinds of scoring from triangular fuzzy number is to represent the Likert scale. The factors of data simulation include type of fuzzy number, number of task-taker and number of item. The results show that fuzzy regression performs well than traditional regression. Based on the findings of this study, some suggestions and recommendations are discussed for future research.

Abstract: The study of Priestley-Taylor (PT) reference crop evapotranspiration model coefficient (α) in local is of great significance in semi-arid agricultural water resources efficient use and precision irrigation in corn. Here, based on the FAO (1998)-recommended Penman-Monteith (PM) reference crop evapotranspiration as a standard method, water and heat exchange and its estimated parameters were determined by eddy covariance technique and Priestley-Taylor model under local climatic conditions. The results indicated that the estimated values of reference crop evapotranspiration (ET_{0-PT 1.26}) in gained by PT mode-recommended coefficient (α = 1.26) lowed by 21.2% during non-growth stages (from November to April next year), and reached an average of 5.5% above PM model reference crop evapotranspiration (ET_0-PM) during May to September. The local PT model coefficient α value was 1.15 ± 0.06. The gained average PT mode coefficient at noon during growth stages showed a peak trend with the highest value 0.67 ± 0.08 at tasseling to flowering stage and with the lowest value 0.26 ± 0.13 at seedling stage. In conclusion, the reference crop evapotranspiration estimated accurately by PT mode in the semi-arid climate area, a local PT parameter is required to gain firstly.

Abstract: The separate calibration models of aromatics and olefins were established for gasoline through recursive partial least square (R-PLS) method in this paper.The some oil refining enterprise application has achieved better effect on the software being realized by R-PLS method. The calibration models were validated through comparison of the results determined by fluorescent indicator adsorption (FIA) and near infrared spectroscopy (NIR) methods.The NIR analysis results were well coincident with those of FIA method.The NIR can not only raise the analysis efficiency and lower the analysis cost,but also has better precision compared with FIA method.

Abstract: Using the derivative of the Boolean function and the e-derivative defined by ourselves as research tools, we go deep into the internal structure of the Boolean function values. Additionally, by the methods of cascade calculations and analytic combinatorics, cryptographic properties such as correlation immune and algebraic immunity of H Boolean functions with Hamming weight of with diffusibility are studied. Then we prove the existing of m order correlation immune H Boolean functions ,and get the result of the sufficient and necessary conditions of algebraic immunity order is 1 of Boolean function with correlation immune order is m.

Abstract: Using the derivative of the Boolean function and the e-derivative defined by ourselves as research tools, we go deep into the internal structure of the Boolean function values. Cryptographic properties such as algebraic immunity, correlation immune and algebraic degree of H Boolean functions with Hamming weight of with diffusibility and the relationship between these properties are studied. Then we get the results of the mathematical expression of linear annihilators, the values of algebraic degree and correlation immune order, and so on.

Abstract: Considering the characteristics of randomness and uncertainty of dam system and the lack of safety monitoring data in some projects, a grey forecasting method based on self-adaptive MGM (1, n) was proposed in this paper to predict the dam deformation. Firstly, theory of the traditional MGM (1, n) model and the parameter estimation method were introduced. On the basis of this, add these forecasted values into the original data group and eliminate the oldest information, the self-adaptive MGM (1, n) model could be established. This paper employs this improved approach in the dam deformation of an arch dam. By predicting the dam deformation in next 5 days, the validity of such method was proved. Compared with GM (1, 1) model and conventional MGM (1, n) model, the experimental results indicate that the forecasting performance is significantly superior to that of the above mentioned two methods.

Abstract: ncreasing functionality accompanied with device miniaturization in microelectronics has led to increased market demand for packages with small form factor. Over the years, embedded wafer level packaging (EWLP) has become an attractive option since it allows a reduction in package size and height. In the EWLP approach, the singulated dies are embedded within the molding compound through the wafer level compression molding process. For this study, critical mechanical challenges such as die shift and thermal cycling performance of a multi-chip embedded wafer level package (MCEWLP) are addressed through numerical modeling. For improved accuracy in die shift predictions, both mechanical effects and fluidic effects need to be taken into account. Mechanical effects account for around 75% of the die shift while fluidic effect contributes to the remaining 25%. It is shown that reducing the die size and the inclusion of UBM as a buffer layer can effectively increase the fatigue life of the packages.

Abstract: In this paper, the effects of chamfer dimension at the Lundbergs profile needle roller end and the grinding undercut of raceway on the pressure distribution, which are used in the oscillatory applications, are discussed. The frame of numerical method for the crown drop evaluation considered these two effects is presented, which makes it possible to profile the needle rollers axially until the longitudinal pressure distribution is neither any edge effects nor high-pressure concentration at the center part of contacts. And the crown drop designed by this method is larger than that by Lundbergs theory. The comparison results of accelerated rolling contact fatigue experiment show that the width of grinding undercut and radius of the chamfer must be considered in determining the crown drop of the needle rollers.