Advanced Materials Research Vols. 472-475

Abstract: In the nanometer technology node, the contradiction between high investment and low yield has got more and more prominent, so it plays a very significant role in improving the yield to optimize layout. The COE, Critical area On Edge network, which is a kind of network based on the redundancy material defect with edges expressing critical areas, is constructed in this paper. Vertexes stand for nets of the layout, and edges do short circuit areas existing in nets. By studying the applications of COE in DFM, it is indicated that the COE provides a new way to the research of nanometer node in DFM.

Abstract: In this paper, a synthesis modeling method of geometric and thermal error is presented. Through the analysis of machine error data at varying temperatures, the error distribution rule is obtained. Based on the different characteristics of geometric error and thermal error, error separation method has been carried out in the modeling. Using polynomial fitting for geometric error and linear fitting for thermal error, a synthesis mathematical model has been proposed. This error compensation method concerns the variations of geometric errors at different temperatures in the machine working, thus a comprehensive analysis is made on the error and its regularity from the overall temperature rise to the heat steady-state. Both at low and high temperatures in the machine working, the experimental validations show that the positioning errors of the machine tool are reduced effectively after applying the error compensation approach.

Abstract: Spherical 0.3LiMn2O3•0.7Li(Ni1/3Co1/3Mn1/3)O2 cathode was synthesized by co-precipitation method followed by calcining at various temperatures (700-950 oC). The structures of the samples were investigated by XRD, SEM, BET and electrochemical method. The results showed that the cathode prepared at 700 oC had the highest discharge capacity of 220.8 mAhg-1 and a satisfactory cycling performance in this study. After 25 cycles, its discharge capacity was still retained as high as 199.6 mAhg-1, which is benefited from the special sphercial microsturcture.

Abstract: AES encryption system is briefly introduced, the function and principle of mask technology has been expressed. Because the vulnerability of the AES encryption system by the energy attacks, the measures need to add to increase the ability of energy analysis of AES. The mask design content is added in the AES encryption system. The mask design of AES encryption was given detailed. Four steps of the mask design process are also given. The conversions and implementation of AES mask design are presented, such as, the transformation of S box and so on. The implementation methods of how to eliminate the mask are given in the final round of AES encryption. It is finally discussed that threaten and influence of energy attack on AES.

Abstract: Machining parameters optimization in face-milling the hypoid gear was often needed in order to obtain lowest cost or highest productivity. In this study, the optimum value of machining parameters including feed rate, rotation speed are obtained using improved harmony search algorithm(IHSA), to yield minimum total time while considering constrains such as allowable cutting speed, tool life and machine tool capabilities. Results indicate that the IHSA converged to optimum solution with similar accuracy in comparison with the genetic algorithm (GA).

Abstract: In this paper the mechanical properties of a series of hydrogen functionalized graphyne are investigated through acting tensile loads on the monolayer networks. Molecular dynamics simulations are performed to calculate the fracture strains and corresponding maximum forces for pristine graphyne along both armchair and zigzag directions. Furthermore, hydrogen functionalized graphynes with different functionalization sites are analyzed to investigate the effect of functionlization on the mechanical performance. Finally, Young's modulus of all the investigated architectures are computed. The obtained results show that monolayer graphyne is mechanically stable with high strength and stiffness, and the mechanical performance can be tuned through structure engineering and functionalization.

Abstract: To improve the production efficiency and product quality of titanium alloy TC4, with the minimum of cutting force F, surface roughness Ra, and surface peak valley height Pv as the optimized goal, using orthogonal rotating combination design method of three factors quadratic regression, the influence of cutting speed vc, feed per tooth fz and cutting width ae to cutting force (Fx, Fy) surface peak valley height Pv and surface roughness Ra are mainly studied, and the best cutting amount combination is chosen. Experiment results indicate that the best cutting parameters of titanium alloy are vc=28.588 m/min、fz=0.043 3 mm/z、ae=0.1 mm, the optimal values are =3.346 N、 =47.01 N、 =673.89 nm and =201.78 nm. This research is of theoretical significance for improving the processing efficiency and machining quality and reducing the production cost.

Abstract: Using Pro/E powerful entity modeling functions and ANSYS finite element analysis of the powerful function, both integration, to spoke type large head sheave work state are analyzed, and establish the mechanical model of the finite element. Through the finite element calculation, carry the strength analysis and research to head sheave in the different conditions. The calculation results show that head sheave works in alternating stress, it is concluded that head sheave of deformation and stress distribution laws. To design and develop spoke type large head sheave provides the basis.

Abstract: Temporary removed due to copyright issues.

Abstract: Blends of polycarbonate (PC) and poly(butylene terephthalate) (PBT) were investigated. For 40 wt % PBT, it forms a continuous phase, the glass transition temperature (Tg) shifts to the lower temperature region. This direct comparison of XRD patterns of pure PBT and PBT containing 1.1% TPPi studied the impact of the crystallization of PBT and TPPi. We can see that diffraction peaks of XRD diagram of PBT/TPPi were broadened. When PBT content was added to 1.1% TPPi, the FWHM increases from 3.8 to 4.2 when diffraction angle was in the range of 16.9 degrees to 17.1 degrees. Thus, the addition of TPPi resulted in the small spherulite size of PBT phase, thus elaborating the sample transparency phenomenon.