Applied Mechanics and Materials Vol. 389

Abstract: The cost of China Power Grid Company's purchasing power is influenced by the relationship between supply and demand of the industry chain, the impact of price fluctuations in the power purchase market, while, the terminal sales price is controlled by the government, not reflecting the supply and demand changes, which makes the income space of power grid corporation uncertainty, therefore, their operation is facing with risk. The paper constructs electricity purchasing and selling risk control optimization model for power Grid Corporation after considering users demand elasticity, electricity distribution in the contract market and real-time market, the compensation cost for users blackout based on the analysis for the influencing factors of Power Grid Corporation and the revenue calculation model.

Abstract: As the political, economic and cultural center of China, Beijing is facing worse CO₂ emission influences than other cities. Therefore, digging out the influence factors of CO₂ emission is valuable for maintaining Beijings sustainable development. This paper discusses the driving forces influencing Beijings CO2 emissions based on Path-STIRPAT model-a method combining Path analysis and STIRPAT (stochastic impacts by regression on population, affluence and technology) model. The analysis shows that GDP per capita (A), industrial structures (IS), population (P), urbanization level (R) and technology level (T) are the main factors influencing Beijings CO2 emissions. The sequence of the size of factors direct influence on Beijings CO2 emissions isA>IS>R>T>P, while that of factors total influence isA>R>P>IS>T.

Abstract: This research proposes an inspection policy aiming to improve the application of C₂F₆ in semiconductor manufacturing. For the gas product C₂F₆, total inspection is commonly employed by the producers before it is sent to downstream manufacturers. The study develops a Bayesian rectifying inspection sampling model with the objective of minimizing expected total cost from the producers standpoint. The factors that influence the total cost include gas product quality, inspection cost, sampling information, product failure cost, inspection accuracy, and decision on the remaining units. Influence diagram is used to represent the problem and derive the total objective function. The application of the model is presented via a real world company using the last four years of data. The proposed inspection policy yields an average of 15% cost savings using a cost reduction estimation method based on hyper-geometric distribution.

Abstract: The necessity of anti-counterfeiting packaging and the concept of nanometer anti-counterfeiting technology to explore the application of nanotechnology in the anti-counterfeiting packaging have been briefly described in this paper. The advantages and disadvantages of nanotechnology in anti-counterfeiting material, in anti-counterfeiting inks, in information encryption are compared by analyzing the principles, characteristic and typical cases. In the end, summarizing the superiority and the issues should be resolved in the application of nanotechnology in anti-counterfeiting packaging to show the prospects.

Abstract: For these Aluminum extrusion products which cross-sectional shape are complex and size diverse, we usually discuss the convective heat transfer on the structural units with a single own geometrical characteristic separately at first, then combine them into a specified profile and reach a systematic uniform cooling design, to achieve a uniform cooling at last. This paper discussed heat transfer at the inclined wall zone with a calculation method of finite element. The considered factors are the spray distance, the flow rate of cooling mediums, the angle of inclination and the way of placement, which influence cooling effects separately. The results show that spray distance has little impact on cooling effects with an optimum range of 60mm to 100mm. As increasing the angle of inclination and flow rate of the cooling medium, profile has a faster and more uneven cooling. In addition, the way of placing profile with its narrow side attached to roller offers a higher cooling rate.

Abstract: Mesoporous hydroxylapatite was prepared by Liquid phase precipitation method, using Polystyrene microspheres as template. Polystyrene microspheres mixed uniformly with the prepared hydroxylapatite slurry, then the mixture dryed and sintered at reasonable temperature, mesoporous hydroxylpatite ceramics were obtained. The phase constituent was analyzed by X-ray diffraction (XRD) and the microstructure was observed under scanning electron microscopy (SEM). The results showed that the prepared mesoporous hydroxylapatite ceramics were of high purity and their pores were evenly distributed, with big pore 0.8-1.0 um and small pore 30-80nm in diameter.

Abstract: To analyze the ballistic characteristics of ejection cylinder in falling stage, the dynamic characteristics of ejection cylinder and parachute are analyzed. Based on force bearing analysis, the particle ballistic model of ejection cylinder and parachute in falling stage are built, and the ballistic data is simulated. The results shows that the ballistic model is reasonable and better simulate ballistic characteristics of ejection cylinder in falling stage. The results can be used to ballistic calculation and determinate the fire data.

Abstract: With the advance of microelectronics technologies and integrated circuits (ICs) processes, the electrostatic discharge (ESD) has become one of the most important reliability issues in IC products. But treating the ESD-related problems is a real challenge. The paper focuses on the influence of the using of Universal Serial Bus (USB) in plugging and/or unplugging impact arisen from ESD and also proposes an ESD protection design to improve the ESD robustness. This work utilizes off-chip protection along with the commercial ceramic products to achieve effective ESD protection. The impact of the ESD stress applied at the connector pins of USB is evaluated. The protection design for the high-speed signal lines is easily to implement and achieves the following attractive features: (1) Power trace protection, (2) Signals traces protection, (3) GND protection, and (4) Shield protection. Numerous tests have been made to demonstrate the effectiveness of the work.

Abstract: A thick film array of high sensitive UFPA detector, with 16×16 units, is described in this paper. A micromachining capacitive pixel structure of infrared detector is provided, with the doped (Ba, Sr) TiO3 (BST) thick film as sensitive material. The key factors that affect the detector performance are described, and the basic physical and electrical parameters of ferroelectric materials that the detector needs are given. In addition, the heat insulation technique and the corresponding parameters are provided. The capacitance increment of pixel for this structure is approximately equal to that of infrared detector with equivalent sensitive area, and then the parasitic capacitance between the pixel and substrate electrode lead is reduced. It is easy to design the integrated circuit because the infrared detector with this structure needs only low precision for the circuit. This design idea for array structure of infrared matches the development trend of structure design of infrared focal plane pixel with large array, which paves the way to develop new UFPA detector.

Abstract: Due to its advantages over the spot welding technique, clinch joining technique is applied extensively in the automobile, electrical apparatus, etc. The quality and strength of the joints are the hot issues of the technique, which are severely affected by the processing parameters and die structure parameters. Clinch joining experiments of aluminous sheets L5 were carried out under various blank holder forces and die structure parameters, and the influence of the parameters on the failure mode, section quality and strength of the joints were analyzed. The results show that the failure of the joints is mainly the shearing and a good section quality and high shearing strength of the joints can be obtained by reasonable processing parameters and die structure parameters.