Hadwiger’s conjecture for powers of cycles and their complements

AbstractC. Thomassen showed that powers of certain cycles are counterexamples to Hajós’ conjecture. We prove that powers of cycles and their complements satisfy Hadwiger’s conjecture, that is, every k-chromatic graph has a k-clique as a minor

BIOMECHANICAL STUDY ON AIM TECHNIQUE IN CHINESE ELITE FREE PISTOL ATHLETES.

INTRODUCTION: The purpose of this study was to analyze the aim technique of elite Chinese free pistol athletes. Pistol shooting in competition requires the athlete to complete 60 shots, consecutively and accurately. This provides a challenge for the marksmen, to maintain the high level of strength needed to perform the technical movements and under pressure. This paper presents a biomechanical study of the shooting techniques using the SELSPOT system. It was used to measure movements of the body-links and firearms in the aiming period in elite Chinese male pistol shooters

Bifurcations in SQUIDs

This thesis shows a systematic way to apply Group Theory and Singularity Theory to bifurcation problems. It can be used to analyze the bifurcation in other dynamical systems such as periodically forced oscillators with one degree of freedom.

Text Mining Model for Virtual Community User Portrait Based on Social Network Analysis

With the rapid development of virtual communities, more and more customers participate in product innovation and knowledge sharing through virtual communities. Research on virtual community members, especially for community members, will help the community to manage the members and further promote community development and knowledge innovation. At present, the main difficulty in the study of community member user portraits lies in the user\u27s grasp of user behavior data in the community. There is a large amount of structured data and semi-structured data in the community, which is crucial for the portrayal dimension of user portraits. This paper uses the association rule crawler algorithm to conduct community user behavior data association search, and uses text mining, social network analysis (SNA) and clustering technology to image users in the knowledge innovation community from the perspectives of professionalism, participation enthusiasm and network capability. The main result divides users into fancier, participator, and tourist