Chaotic Dynamics Analysis Based on Financial Time Series

It is a common phenomenon in the field of financial research to study the dynamic of financial market and explore the complexity of financial system by using various complex scientific methods. In this paper, the chaotic dynamic properties of financial time series are analyzed. Firstly, the nonlinear characteristics of the data are discussed through the empirical analysis of agriculture index data; the daily agriculture index returns can be decomposed into the different scales based on wavelet analysis. Secondly, the dynamic system of some nonlinear characteristic data is established according to the Taylor series expansion form, and the corresponding dynamic characteristics are analyzed. Finally, the bifurcation diagram of the system shows complicated bifurcation phenomena, which provides a perspective for the analysis of chaotic phenomena of economic data.

Investigation of Corrosion Rate and Rust Expansion Form of Segment Reinforcement for Shield Tunnel by Combined Action of Soil Loading, Chloride Ion and Stray Current

Segment reinforcement corrosion can cause bearing-capacity degradation of shield tunnel, which is unsafe for the metro operation. Therefore, a three-dimensional computational model was proposed in this paper to study the corrosion rate and rust expansion form of segment reinforcement by the combined action of soil loading, chloride ion and stray current. The results show that the arch waist segment steel corrosion rate in the middle is larger than the ends. The rust expansion form of segment reinforcement appears be an eccentric circle. The radius size and circular center are related to the non-uniform corrosion coefficient and the maximum corrosion current density.

Application of Virtual Simulation Technology in Chemistry Teaching

Nowadays, the application of virtual simulation experiment teaching resources in universities is not systematic and comprehensive enough. Therefore, integrating professional-related virtual simulation experiment teaching resources and constructing virtual simulation comprehensive training courses can not only strengthen and expand professional knowledge and improve professional thinking but also strengthen students’ ability to realize innovative thinking. While enriching experimental teaching forms and teaching effects, virtual simulation technology also promotes the integration of experimental teaching and theoretical teaching. The article mainly discusses the application of virtual simulation technology in university chemistry teaching practice and its impact on teaching effects and then summarizes the entry point and expansion form of virtual simulation technology in the curriculum, and serves the promotion of digital and information technology in chemistry teaching application.

Research on the Effect of Urbanization on China’s Carbon Emission Efficiency

Improvements in carbon emission efficiency are crucial to China’s economic growth; carbon emission reduction and urbanization are two of the focuses of research on carbon emission efficiency. This paper selects 2000–2015 panel data from 30 provinces in China, evaluates the carbon emission efficiency of each province using the DEA method and, based on the STIRPAT expansion form, empirically looks at the effect of urbanization on carbon emission efficiency. The results show that, during the chosen time frame, not only did the carbon emission efficiency of China’s provinces show an upward trend but the carbon emission efficiency of the Eastern, Central and Western regions differed markedly, with the highest efficiency in the Eastern region, the second highest in the Central region and the lowest in the Western region. After controlling for population density, economic development level, energy intensity and industrial structure, urbanization we determine that urbanization can indeed improve carbon emission efficiency, although there are regional differences. Urbanization is conducive to improvements in carbon emission efficiency in both the Central and Western regions but the promotion effect of the Western region is stronger. The effect in the Eastern region is not significant. Based on the conclusions above, this paper puts forward policy recommendations that promote both China’s lower carbon efficiency and future environmental protection.

Dynamic Parallel Mining Algorithm of Association Rules Based on Interval Concept Lattice

An interval concept lattice is an expansion form of a classical concept lattice and a rough concept lattice. It is a conceptual hierarchy consisting of a set of objects with a certain number or proportion of intent attributes. Interval concept lattices refine the proportion of intent containing extent to get a certain degree of object set, and then mine association rules, so as to achieve minimal cost and maximal return. Faced with massive data, the structure of an interval concept lattice is more complex. Even if the lattice structures have been united first, the time complexity of mining interval association rules is higher. In this paper, the principle of mining association rules with parameters is studied, and the principle of a vertical union algorithm of interval association rules is proposed. On this basis, a dynamic mining algorithm of interval association rules is designed to achieve rule aggregation and maintain the diversity of interval association rules. Finally, the rationality and efficiency of the algorithm are verified by a case study.

Experimental Study on Directional Fracture Blasting of Cutting Seam Cartridge

Since the cutting seam cartridge has sound directional breaking effect, in order to explore its blasting wave mechanism, an experimental study was conducted on the blast wave of a cutting seam cartridge using a high-speed laser schlieren system and air overpressure test system. The research results show that during cartridge explosion, the cutting seam pipe can effectively control the energy release and detonation gas dynamic behaviors. Additionally, the cartridge blast wave and the detonation gas remain highly symmetrical in expansion form. The blast wave first propagates along the cutting seam direction, and the detonation gas initially expands from the seam in the direction of the cutting seam. The pressure in the cutting seam direction is higher than that in the noncutting seam direction. The blast wave change of the whole flow field of the cutting seam cartridge was numerically simulated and was basically consistent with the results of the schlieren test in distribution form. The presence of a cutting seam prolongs the blast wave effect. During expansion of the cutting seam pipe under the influence of a blast wave, the inner wall of the cutting seam pipe is mainly subject to tensile stress. When the tensile force applied to the inner wall reaches the local yield limit, the cutting seam pipe fails.

Nonlinear System Modeling based on System Equilibrium Manifold

The main objective of the present paper is to provide an approximate method for nonlinear system with a family of equilibrium points (EPs). By investigating the system’s equilibrium manifold (EM) and its expansion form, a class of nonlinear system is modeled analytically. The property of the EM expansion form and the effect of mapping design and parameterizing method to the model have been discussed. Then an approximate nonlinear model for aircraft engine was applied, followed by an identification procedure for aircraft engine. It is shown that the modeling method based on system’s EM can not only comply with the system physical characteristics, but also satisfy the accuracy of modeling requirement. Numerical simulations are given to demonstrate the good precision in capturing the nonlinear behavior of nonlinearities and a simpler structure.

KSCC dan Diplomasi Budaya Korea

AbstrakEkspansi Budaya Republik Korea yang biasa disebut sebagai Hallyu benar-benar bisa dikatakan menunjukkan hasil yang signifikan di Indonesia. Signifikansi dari ekspansi budaya Republik Korea itu dapat dilihat pada menjamurnya komunitas-komunitas Korea yang dibentuk di beberapa kota di Indonesia seperti Running Man Lovers, Forever Dance center Jakarta (FDC Kpop dance cover), UI Hangugo Dongari dan masih banyak yang lainnya. Dalam Penelitian ini Peneliti Melihat bahwa Republik Korea menggunakan segala sumber dayanya untuk melakukan ekspansi budaya di Indonesia antara lain melalui pameran budaya yang dilakukan oleh Pusat Kebudayaan Korea di Indonesia (KCC), Drama-drama korea yang ditayangkan di Stasiun TV Indonesia dan masih banyak lagi. Di kota Malang sendiri peneli-ti menyimpulkan kesuksesan Diplomasi Budaya Repubik Korea tersebut dapat dilihat dari terbentuknya komunitas korea di kota Malang yaitu Korean Studies and Culture Center (KSCC)Kata-kata Kunci : Diplomasi Budaya, Komunitas Korea, KSCC AbstractCultural expansion of Korean Republic namely Hallyu show the significance result in Indonesia. We can see the sig-nificance result of Cultural expansion form Korean Republic form many korean community which established in In-donesia like Running Man Lovers, Forever Dance Center Jakarta (FDC Kpop dance cover), UI Hangugo Dongari and others. in others word Korean Republic has used all of their capacity to expans their culture in Indonesia through Ko-rean cultural exhibition organized by Korean Cultural Center in Indonesia, Korean Drama which show by tv chanel in Indonesia and many others. In Malang City the successfull of Cultural Diplomacy form Korean Republic marked by the forming of Korean Studies and Culture Center (KSCC).Key Words : Cultural Diplomacy, Korean Community, KSCC