The Current Situation, Predicament and Strategies of Tai Chi Teaching and Spreading in European Confucius Institutes - Taking the Confucius Institute of Belarus National University of Sport as an Example -

Shouyan Tang,Qing Yang,Peng Song 아시아건강운동학회 2022 Journal of Asian Society for Health & Exercise Vol.4 No.2

Study on dynamic interaction between crack and inclusion or void by using XFEM

Shouyan Jiang,Chengbin Du 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.63 No.3

This paper devoted to study dynamic interaction between crack and inclusion or void by developing the eXtended Finite Element Methods (XFEM). A novel XFEM approximation is presented for these structures containing multi discontinuities (void, inclusion, and crack). The level set methods are used so that elements that include a crack segment, the boundary of a void, or the boundary of an inclusion are not required to conform to discontinuous edges. The investigation covers the effects of a single circular or elliptical void / stiff inclusion, and multi stiff inclusions on the crack propagation path under dynamic loads. Both the void and the inclusion have a significant effect on the dynamic crack propagation path. The crack initially curves towards into the void, then, the crack moves round the void and propagates away the void. If a large void lies in front of crack tip, the crack may propagate into the void. If an enough small void lies in front of crack tip, the void may have a slight or no influence on the crack propagation path. For a stiff inclusion, the crack initially propagates away the inclusion, then, after the crack moves round the inclusion, it starts to propagate along its original path. As δ (the ratio of the elastic modulus of the inclusion to that of the matrix) increases, a larger curvature of the crack path deflection can be observed. However, as δ increases from 2 to 10, the curvature has an evident increase. By comparison, the curvature has a slight increase, as δ increases from 10 to 1000.

An investigation into the effects of voids, inclusions and minor cracks on major crack propagation by using XFEM

Shouyan Jiang,Chengbin Du,Chongshi Gu 국제구조공학회 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.49 No.5

For the structures containing multiple discontinuities (voids, inclusions, and cracks), the simulation technologies in the framework of extended finite element method (XFEM) are discussed in details. The level set method is used for representing the location of inner discontinuous interfaces so that the mesh does not need to align with these discontinuities. Several illustrations have been given to verify that the implemented XFEM program is effective. Then, the implemented XFEM program is used to investigate the effects of the voids, inclusions, and minor cracks on the path of major crack propagation. For a plate containing cracks and voids, two possibly crack path can be observed: i) the crack propagates into the void; ii) the crack initially curves towards the void, then, the crack reorients itself and propagates along its original orientation. For a plate with a soft inclusion, the final predicted crack paths tend to close with the inclusion, and an evident difference of crack paths can be observed with different inclusion material properties. However, for a plate with a hard inclusion, the paths tend to away from the inclusion, and a slightly difference of crack paths can only be seen with different inclusion material properties. For a plate with several minor cracks, the trend of crack paths can still be described as that the crack initially curves towards these minor cracks, and then, the crack reorients itself and propagates almost horizontally along its original orientation.

Status Quo and Strategy of Development of Wushu Sanda Event in Korea

TANG Shouyan 아시아건강운동학회 2021 Journal of Asian Society for Health & Exercise Vol.3 No.2

In order to seek for the diversified development of Sanda during its process of internationalization in view of overall Wushu view, this article consulted documents and data to analyze the current development of Sanda in Korea. The research shows that Sanda starts early in Korea and the international performance is ideal but unstable; the organization of domestic matches is standard but there are few participators; and the content in domestic Wushu gymnasiums is diverse but lack of unified teaching materials. Strengthening international communication, organizing step teacher team and unifying the teaching content of Wushu gymnasiums are the best paths for the development of Sanda in Korea.

Study on dynamic interaction between crack and inclusion or void by using XFEM

Jiang, Shouyan,Du, Chengbin Techno-Press 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.63 No.3

This paper devoted to study dynamic interaction between crack and inclusion or void by developing the eXtended Finite Element Methods (XFEM). A novel XFEM approximation is presented for these structures containing multi discontinuities (void, inclusion, and crack). The level set methods are used so that elements that include a crack segment, the boundary of a void, or the boundary of an inclusion are not required to conform to discontinuous edges. The investigation covers the effects of a single circular or elliptical void / stiff inclusion, and multi stiff inclusions on the crack propagation path under dynamic loads. Both the void and the inclusion have a significant effect on the dynamic crack propagation path. The crack initially curves towards into the void, then, the crack moves round the void and propagates away the void. If a large void lies in front of crack tip, the crack may propagate into the void. If an enough small void lies in front of crack tip, the void may have a slight or no influence on the crack propagation path. For a stiff inclusion, the crack initially propagates away the inclusion, then, after the crack moves round the inclusion, it starts to propagate along its original path. As ${\delta}$ (the ratio of the elastic modulus of the inclusion to that of the matrix) increases, a larger curvature of the crack path deflection can be observed. However, as ${\delta}$ increases from 2 to 10, the curvature has an evident increase. By comparison, the curvature has a slight increase, as ${\delta}$ increases from 10 to 1000.

An investigation into the effects of voids, inclusions and minor cracks on major crack propagation by using XFEM

Jiang, Shouyan,Du, Chengbin,Gu, Chongshi Techno-Press 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.49 No.5

For the structures containing multiple discontinuities (voids, inclusions, and cracks), the simulation technologies in the framework of extended finite element method (XFEM) are discussed in details. The level set method is used for representing the location of inner discontinuous interfaces so that the mesh does not need to align with these discontinuities. Several illustrations have been given to verify that the implemented XFEM program is effective. Then, the implemented XFEM program is used to investigate the effects of the voids, inclusions, and minor cracks on the path of major crack propagation. For a plate containing cracks and voids, two possibly crack path can be observed: i) the crack propagates into the void; ii) the crack initially curves towards the void, then, the crack reorients itself and propagates along its original orientation. For a plate with a soft inclusion, the final predicted crack paths tend to close with the inclusion, and an evident difference of crack paths can be observed with different inclusion material properties. However, for a plate with a hard inclusion, the paths tend to away from the inclusion, and a slightly difference of crack paths can only be seen with different inclusion material properties. For a plate with several minor cracks, the trend of crack paths can still be described as that the crack initially curves towards these minor cracks, and then, the crack reorients itself and propagates almost horizontally along its original orientation.

Numerical analysis of sheet pile wall structure considering soil-structure interaction

Jiang, Shouyan,Du, Chengbin,Sun, Liguo Techno-Press 2018 Geomechanics & engineering Vol.16 No.3

In this paper, a numerical study using finite element method with considering soil-structure interaction was conducted to investigate the stress and deformation behavior of a sheet pile wall structure. In numerical model, one of the nonlinear elastic material constitutive models, Duncan-Chang E-v model, is used for describing soil behavior. The hard contact constitutive model is used for simulating the behavior of interface between the sheet pile wall and soil. The construction process of excavation and backfill is simulated by the way of step loading. We also compare the present numerical method with the in-situ test results for verifying the numerical methods. The numerical analysis showed that the soil excavation in the lock chamber has a huge effect on the wall deflection and stress, pile deflection, and anchor force. With the increase of distance between anchored bars, the maximum wall deflection and anchor force increase, while the maximum wall stress decreases. At a low elevation of anchored bar, the maximum wall bending moment decreases, but the maximum wall deflection, pile deflection, and anchor force both increase. The construction procedure with first excavation and then backfill is quite favorable for decreasing pile deflection, wall deflection and stress, and anchor forces.

Performance of Mg-Ti modified iron-based catalyst in NH3-SCR of NO at the presence of arsenic: Influence of oxygen and temperature

Xiaoyu Li,Juan Chen,Shouyan Chen,Chunmei Lu,Guangqian Luo,Hong Yao 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.101 No.-

Impact of arsenic on the performance of Mg-Ti modified iron-based catalyst during selective catalyticreduction of NOx with ammonia was studied. The results indicated that Mg and Ti modification not onlyimproved the catalytic activity at 100–350 C, but also exhibited remarkable anti-arsenic ability. Mg wasdominant in the excellent anti-arsenic performance, and this role was firstly recognized. The anti-arsenicmechanism of Mg-Ti modified iron-based catalyst was ascribed to two aspects. One side, Mg exhibitedwell reactivity with arsenic which competed with Fe for the adsorption of arsenic and protected activeiron sites from arsenic occupation. The other side, presence of Mg promoted the formation of MgFe2O4in view of the strong interactions between Mg and Fe, suppressing the interactions between arsenicand Fe. Instead, gaseous arsenic turned to bond with Mg-O sites. Consequently, surface acid sites andfunction Fe-OH/ Fe = O bonds were preserved for de-NOx. Moreover, increase of oxygen content and temperatureweakened the deactivation of Mg-Ti modified iron-based catalyst by arsenic. It was due to theoxidation of As2O3 with oxygen content increase and the strengthened reactivity of non-active iron siteswith arsenic and Mg with arsenic as temperature elevation, inhibiting the interactions between activeiron sites with arsenic.

Reconstruction of internal structures and numerical simulation for concrete composites at mesoscale

Chengbin Du,Wu QIN,Hairong Xu,Dong Lei,Shouyan Jiang,김충호 사단법인 한국계산역학회 2012 Computers and Concrete, An International Journal Vol.10 No.2

At mesoscale, concrete is considered as a three-phase composite material consisting of the aggregate particles, the cement matrix and the interfacial transition zone (ITZ). The reconstruction of the internal structures for concrete composites requires the identification of the boundary of the aggregate particles and the cement matrix using digital imaging technology followed by post-processing through MATLAB. A parameter study covers the subsection transformation, median filter, and open and close operation of the digital image sample to obtain the optimal parameter for performing the image processing technology. The subsection transformation is performed using a grey histogram of the digital image samples with a threshold value of [120, 210] followed by median filtering with a 16 × 16 square module based on the dimensions of the aggregate particles and their internal impurity. We then select a “disk” tectonic structure with a specific radius, which performs open and close operations on the images. The edges of the aggregate particles (similar to the original digital images) are obtained using the canny edge detection method. The finite element model at mesoscale can be established using the proposed image processing technology. The location of the crack determined through the numerical method is identical to the experimental result, and the load-displacement curve determined through the numerical method is in close agreement with the experimental results. Comparisons of the numerical and experimental results show that the proposed image processing technology is highly effective in reconstructing the internal structures of concrete composites.