Advanced Materials Research Vol. 462

Abstract: The ZnO film as the material, the charge amplifier and the accelerometer in one set, to record and display the measurement data directly, simplifying the testing system to improve the test accuracy and reliability. Charge amplifier circuit is designed to be simple, easy to debug, high integration, low cost, favorable ZnO thin films driven by the widespread use of the accelerometer.

Abstract: In glass fiber textile process, non-axis volume cloth drive motor with glass fabric volume increases, increasing the pressure on the drive shaft, moreover, because of cloth non-axis volume makes the pressure in the process of change is evident, that causes the motor load changing constantly, the traditional PID control system controller cannot timely tracking response. In order to solve the problem which the control parameters optimizes, improves the system performance, proposed a new Ant colony algorithm PID parameters optimization strategy, this solution can combine characteristics that Ant colony algorithm can fast find the most superior parameter solution stably and PID can precise adjustment. In the control process, taken the PID parameters as a colony of ants, used to control the absolute error integral function as the optimization objective, dynamically adjust the PID control parameters in the control process, so as to realize the PID parameters on-line tuning.

Abstract: In order to make sure whether the Cr₂O₃ would change to Cr⁶⁺ during the service, 4wt % Cr₂O₃ was added to the calcium aluminate cement bonded Al₂O₃-SiC-C castables for blast furnace main trough, then the phase evolution was analyzed through thermodynamic calculation done by Factsage 6.1 under air atmosphere, which is close to its real work conditions. Calculations results show that Cr₂O₃ was reduced to Cr₃C₂ with low air amount, with amount of air increase, Cr₃C₂ transformed to Cr₄C and Cr₅Si₃ successively, and turned to Cr₂O₃ at last with much more air, and no compound including Cr⁶⁺ was founded.

Abstract: For testing and analyzing thenar pressure and obtaining the physiologic and pathologic parameter about posture and athletics, LiNbO₃ film is deposited on latex substrate by RF magnetron sputtering and connected with the signal collecting instruments to compose testing system of thenar pressure .The system is applied in the actual test. The experiments indicate that the LiNbO₃ piezoelectric-film has better sensitivity stabilization and repeatability, and it can obtain reliable the thenar pressure signals. It confirms that the LiNbO₃ piezoelectric-film was suitable for thenar pressure measurement.

Abstract: Dark green passivation film was prepared by dipping galvanized steel in a solution made of four types of acid(chromic anhydride, phosphoric acid, nitric acid and sulfuric acid) with a certain amount of stabilizer and toner. Scanning Electron Microscopy was used to observe the morphology of the film. Elements of passivation film were conformed by using EDS. SEM showed that the surface of the film was even. Cr, O, P, S, N, Zn and a small amount of Fe were found in the film by the test of EDS.

Abstract: Materials present elastic-plastic deformation under cyclical loading because of the influence of vibration friction, and restoring force and the displacement show hysteretic characteristics in compacting mechanism and materials system. To further study nonlinear dynamics of the vibrating compacting system, system model with symmetric hysteretic curve was established in this paper, and was verified by experiment. Bifurcation and chaos motion were studied in nonlinear vibrating compacting system by the combination of qualitative theory and numerical solution, and analysis results show that vibration have piecewise and singular characteristics in vibrating compacting system, and hysteretic loop parameters show significant influence on system and large effect on nonlinear dynamics of system.

Abstract: In integrated circuit (IC) fabrication, chemical-mechanical planarization (CMP) is a process used for achieving a uniformed surface on the wafer through a combination of chemical and mechanical effects. While CMP is the preferred planarization technique, the surface damage created is a major concern as it leads to performance degradation and yield loss. The severity of surface damage is dependent on the uniformity of metal density of the wafer. To overcome this problem, metal fill insertion is introduced to ensure uniformed metal density and minimal topological variation after the CMP process. However, metal fill insertion will contribute to parasitic effects changes on on-chip interconnect layers. Thus, it is crucial to be able to predict and estimate parasitic effects contributed by both neighboring nets and metal fill early in the design cycle to prevent over-designing and under-designing. This paper introduces a design flow which takes into account parasitic effects of metal fill early in the design cycle through metal fill emulation to provide a form of early fill effect modeling so that design engineers to not over-design or under-design. Experiments performed shows that parasitic extraction with emulated metal fill achieved accuracy with the largest difference of 21.2% compared to extraction performed on a test-design with router-based filler.

Abstract: A curvilinear-tooth face-gear has been developed in order to obtain a high contact ratio, reduced bending stresses and lower sliding velocities compared to the spur and helical involute face-gear drives. The machining method for this type of gear was studied based on the differential geometry and meshing theory in this paper. The cutting mathematical model of the face-gear was established, and then the cutting simulation of the face-gear was developed.

Abstract: A numerical model of cathode erosion in EDM process using finite element method is presented. Using this model, numerical simulation of the single spark of EDM process has been carried out with parameters such as conduction, convection, the latent heat of phase change, thermal properties of material with temperature and gauss distribution of heat flux to predict the temperature distribution in the discharge point of cathode as a result of single discharges in EDM process. The simulation result shows the trend of dynamic temperature distribution of heat -affected zone and well explains mechanism of material removal in EDM process.

Abstract: Elliptic Curve Cryptosystem is a research focus of public key cryptography. The advantage of ECC is described in this paper, on the basis of which the architecture of the Elliptic Curve Cryptosystem is determined. We design hardware and implement addition, square, multiplication and inverse over GF(2^m)using Verilog. On the basic operation, we design the scalar multiplication and accomplish the final elliptic curve encryption and decryption function. At last, we test the design in this paper with the verification model and platform are constructed and count coverage metrics ratio for it. The coverage metrics ratio is 100% and verification results is right. The core is synthesized and simulated on timing. The gate-level simulation results is the same to functional results. It’s work frequency is 125MHz.