Applied Mechanics and Materials Vols. 204-208

Abstract: By a dynamical system we mean a compact metric space together with a continuous map . This article is devoted to study of invariant scrambled sets. A dynamical system is a periodically adsorbing system if there exists a fixed point and a periodic point such that and are dense in . We show that every topological weakly mixing and periodically adsorbing system contains an invariant and dense Mycielski scrambled set for some , where has no isolated points. A subset is a Myceilski set if it is a countable union of Cantor sets.

Abstract: ETABS has a powerful 3D modeling platform and ABAQUS provides an efficient explicit solver. By combining the advantages of ETABS and ABAQUS, this study found the difference in their model data files and used the MATLAB software to compile the conversion program, which can directly convert the ETABS models to ABAQUS. Finally, by comparing the calculated results of different analysis software, it is found that the calculated results were basically the same and the conversion process was correct.

Abstract: For any Positive Integer N, LetΦ(n)andS(n)Denote the Euler Function and the Smarandache Function of the Integer N.In this Paper, we Use the Elementary Number Theory Methods to Get the Solutions of the Equation Φ(n)=S(n^k) if the K=9, and Give its All Positive Integer Solutions.

Abstract: To improve the contrast ratio and brightness of video surveillance image in mine, we modify the histogram equalization algorithm by extent the boundary when calculating the sum of gray probability. Experimental results show that the algorithm can reserve the characteristics of the histogram equalization and improve the image’s brightness.

Abstract: Project procurement management is the substantial basis of engineering project and also critical about executing project process. Three points should be concerned which are basic program for procurement work: full workflow, cost consciousness and superior suppliers to achieve procurement management by business software.

Abstract: By using fixed point index theory,we study the existence of positive radial solutions and multiple positive radial solutions for the elliptic system with nonlocal conditions. Our results extend and improve some existing ones.

Abstract: In this paper, by using Windows Socket, network communication, VC++ programming and etc., the design and implementation of a simulation model of communication gateways get realized. This paper realized the functional requirements of the communication gateway in the system where it located, and perfectly simulated the functions of communication network protocol processing and conversion, data packet encapsulation and distribution and other functions, which provided a solid theoretical and practical basis for the development of communication gateway.

Abstract: In the field of structural health monitoring, digital image measurement as a new monitoring technology is gradually being widely used. Real-time measurement for the torsion, however, has been the difficulty in the high-rise structure monitoring. This paper first analyzes the factors that caused the structure’s torsion and introduced the principle, but also the working mode of this new image measurement system, then a measuring scheme for high-rise structure’s torsion has been proposed, which indicates that this measurement technique is an effective new method.

Abstract: This paper focuses on two integration algorithms used for pseudo-dynamic test, explicit Newmark algorithm and implicit alpha-C algorithm. The comparison study between the test and simulation results shows that: the non-uniform distribution of mass, restoring force characteristics and higher frequency vibration modality are simulated more accurately using the alpha-C algorithm than using explicit Newmark algorithm. The alpha-C algorithm also leads to high iterative accuracy and unconditional stability. Replacing the explicit Newmark algorithm in original experimental system by implicit alpha-C algorithm, the MDOF pseudo dynamic test system can be realized successfully.

Abstract: Heterogeneous strategy is used to improve genetic algorithm. It can increase the population diversity and avoid premature while the convergence efficiency is ensured. Furthermore, an expression to estimate the extent of inbreeding and two methods for selecting heterogeneity were given, and, an improved generalized genetic algorithm was presented in this paper. This algorithm is used for multi-parameter dynamic optimization of the structure which is under random loads and has stress constrains. Numerical examples demonstrated that heterogeneous strategy can improve the probability of convergence to global optimal solution and the improved generalized genetic.