Zhang X.,Xinzhou Teachers University |
Shan G.,University of Lethbridge |
Shan G.,Shaanxi Normal University
Scandinavian Journal of Medicine and Science in Sports | Year: 2014
One of the challenging skills in golfing is the driver swing. There have been a large number of studies characterizing golf swings, yielding insightful instructions on how to swing well. As a result, achieving a sub-18 handicap is no longer the top problem for golfers. Instead, players are now most troubled by a lack of consistency during swing execution. The goal of this study was to determine how to consistently execute good golf swings. Using 3D motion capture and full-body biomechanical modeling, 22 experienced golfers were analysed. For characterizing both successful and failed swings, 19 selected parameters (13 angles, 4 time parameters, and 2 distances) were used. The results showed that 14 parameters are highly sensitive and/or prone to motor control variations. These parameters sensitized five distinct areas of swing to variation: (a) ball positioning, (b) transverse club angle, (c) transition, (d) wrist control, and (e) posture migration between takeaway and impact. Suggestions were provided for how to address these five distinct problem areas. We hope our findings on how to achieve consistency in golf swings will benefit all levels of golf pedagogy and help maintain/develop interests to involve more golf/physical activity for a healthy lifestyle. © 2013 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.
Zhao S.,Shanxi University |
Zhao S.,Xinzhou Teachers University |
Wang X.,Shanxi University |
Zhang L.,Shanxi University
RSC Advances | Year: 2013
An efficient and reusable protic-ionic-liquid solvent-catalyst system, HMTA-AcOH-H2O, has been developed and used in the Knoevenagel condensation reaction of aromatic aldehydes with ethyl 2-cyanoacetate. Under ultrasonic irradiation, the Knoevenagel condensation promoted by the protic-ionic-liquid solvent-catalyst system proceeds smoothly and cleanly. Moreover, the HMTA-AcOH-H2O solvent-catalyst system could be recycled for at least 6 times and no significant loss of activity was observed. This protocol has notable advantages, such as being eco-friendly, the ease of the work-up and reuse of the ionic liquid conveniently, which could help reduce disposal costs and contribute to the development of new catalysts for use in green and continuous chemical processes. © The Royal Society of Chemistry 2013.
Zhang H.-W.,Xinzhou Teachers University |
Xue H.-B.,Taiyuan University of Technology |
Nie Y.-H.,Shanxi University
AIP Advances | Year: 2013
The full counting statistics of electron transport through a quantum dot (QD) doped with a single magnetic impurity weakly coupled to one ferromagnetic (F) and one normal-metal lead (N) is studied based on an efficient particle-number-resolved master equation. We demonstrate that the current noise properties depend sensitively on whether the source-electrode is the ferromagnetic lead and the type of exchange coupling between the conduction electron and magnetic impurity spin. For the F-QD-N system, namely, the ferromagnetic lead as source electrode and the normal-metal lead as drain one, the super-Poissonian noise in the anti-ferromagnetic coupling case can appear; whereas for the ferromagnetic coupling case the super-Poissonian noise does not appear. As for the N-QD-F system, the super-Poissonian noise in the ferromagnetic coupling case can appear in a relatively large bias voltage range; while for the anti-ferromagnetic coupling case, the super-Poissonian noise appears only in a relatively small bias voltage range. These super-Poissonian noise characteristics can be used to reveal the type of exchange coupling between the conduction electron and magnetic impurity spin, and can be qualitatively attributed to the spin-blockade mechanism and the effective competition between fast and slow transport channels. © 2013 © 2013 Author(s).
Zhao Q.-S.,Xinzhou Teachers University |
Hu Y.-L.,Yanshan University
International Journal of Wireless and Mobile Computing | Year: 2012
This paper focuses on the node localisation in various topological and sparse wireless sensor networks. To make up for the shortcomings of the dwMDS(G) algorithm on the positioning accuracy and convergence performance, this paper proposes an improved multidimensional scaling localisation algorithm. Firstly, Multidimensional Scaling (MDS) algorithm is used to obtain the unknown nodes initial coordinates. Secondly, Particle Swarm Optimisation (PSO) algorithm is adopted to obtain the unknown nodes final coordinates by optimising the local cost function. Experimental results show that the localisation accuracy, convergence and robustness of the proposed algorithm are better than those of the existing dwMDS(G) algorithm. Copyright © 2012 Inderscience Enterprises Ltd.
Wang H.,Xinzhou Teachers University
Journal of Computational Information Systems | Year: 2011
In wireless sensor networks, node localization algorithm presently, its accuracy should be enhanced further. In this paper, the introduction of the steepest descent method as the objective function of the optimization method, this method is simple, easy to implement. Experimental results show that compared with the algorithm based SMACOF, DWMDSS has increased significantly in the algorithm accuracy, and have a relatively good performance in the anti-error effect, the convergence and convergence speed, and also performs well in the heterogeneous network. © 2005 by Binary Information Press.
Li H.Q.,Xinzhou Teachers University
Asian Journal of Chemistry | Year: 2014
The interaction of Alizarin red and bovine serum albumin has been investigated by fluorescence spectroscopy. A 1:1 complex were found to form and the distance between the Trp-212 residues of bovine serum albumin and Alizarin red binding site was calculated to be 1.82 nm. The interaction force between Alizarin red and bovine serum albumin was suggested to be mainly van der Waals force and hydrogen bond through the calculated thermodynamic parameters of the reaction. Also ion strength effects, titration experiment of bovine serum albumin to Alizarin red were used to determine the force. Autodock research further proved the interaction mode. These experimental and theoretical data are of potential importance in understanding the mechanism of interaction between Alizarin red and bovine serum albumin.
Bai M.,Xinzhou Teachers University
Future Communication, Information and Computer Science - Proceedings of the International Conference on Future Communication, Information and Computer Science, FCICS 2014 | Year: 2015
International trade has become more frequent with economic globalization, but trade barriers and frictions have occasionally occurred. The work analyzed the influences of trade barriers on the current international economic situation. Based on the causes of international trade barriers, the influences were discussed in two aspects – tariff barrier and non-tariff barrier. It’s hoped to help the development of import and export trade in Chinese enterprises. © 2015 Taylor & Francis Group, London.
Cao J.,Xinzhou Teachers University |
Chen L.,Taiyuan University of Science and Technology
Computational Intelligence and Neuroscience | Year: 2015
With the advances in electronic and imaging techniques, the production of digital images has rapidly increased, and the extraction and automated annotation of emotional semantics implied by images have become issues that must be urgently addressed. To better simulate human subjectivity and ambiguity for understanding scene images, the current study proposes an emotional semantic annotation method for scene images based on fuzzy set theory. A fuzzy membership degree was calculated to describe the emotional degree of a scene image and was implemented using the Adaboost algorithm and a back-propagation (BP) neural network. The automated annotation method was trained and tested using scene images from the SUN Database. The annotation results were then compared with those based on artificial annotation. Our method showed an annotation accuracy rate of 91.2% for basic emotional values and 82.4% after extended emotional values were added, which correspond to increases of 5.5% and 8.9%, respectively, compared with the results from using a single BP neural network algorithm. Furthermore, the retrieval accuracy rate based on our method reached approximately 89%. This study attempts to lay a solid foundation for the automated emotional semantic annotation of more types of images and therefore is of practical significance. © 2015 Jianfang Cao and Lichao Chen.
Miao C.,Xinzhou Teachers University |
Li S.,Xinzhou Teachers University
Science China Chemistry | Year: 2011
A density functional theory (DFT) investigation has been performed in this work on the cage-like boron-rich boron oxide clusters B n (BO) n 2-, CB n-1(BO) n -, and C2B n-2(BO) n (n = 5-12) which are boronyl analogues of the closo-boranes B n H n 2-, monocarboranes CB n-1H n -, and dicarboranes C2B n-2H n . These boron oxide clusters possess similar geometrical and electronic structures with the corresponding boranes and carboranes and prove to be three-dimensional (3D) aromatic compounds, consistent with the previously proposed BO/H isolobal analogy. Neutral C 2B n-2(BO) n species possess considerably high ionization potentials in the range 12.0-12.7 eV and CB n-1H n - monoanions have the vertical electron detachment energies in the range 6.6-9.4 eV at the DFT level. BO terminals singly bonded to the skeletal vertexes through a B atom possess the characteristic stretching vibrational frequencies at about 2000 cm-1, clearly indicating the existence of B ≡ O triple bonds in these clusters. Experimental syntheses and characterizations of these interesting clusters may expand the structural concepts of boron oxides and bring important applications for boron oxide clusters as molecular devices in chemistry and new materials in boron neutron capture therapy. © Science China Press and Springer-Verlag Berlin Heidelberg 2011.
Guo J.-C.,Xinzhou Teachers University
Journal of Molecular Structure: THEOCHEM | Year: 2010
The structural, electronic and aromatic properties of novel sandwich complexes [M(C6Li6)2]n- (M=Nb, Ta, Mo and W; n=1, 0) containing star-like hexalithiobenzenes have been investigated by both density functional theory (DFT) and ab initio theory calculations in this work. These sandwich complexes with the staggered D6d symmetry structures are all true minimum with singlet electron state, while the D6h symmetry conformations are the transition states on the potential energy surface with one imaginary vibration frequency. The effective d-π coordination interactions between the partially filled 4d (or 5d) orbitals of transition-metal atoms and the delocalized π orbitals of the C6Li6 maintain the stabilities of these novel sandwich complexes. The centered metal of these novel sandwich complexes meet well with the 18-electron requirements. The negative NICS values for the C6Li6 ligands clearly indicated that these complexes are all aromatic in nature. The infrared (IR) spectra of these complexes have been simulated to facilitate the future experiment. These novel sandwich complexes turn out to be strongly thermodynamically favored in the gas phases and may be targeted in future experiments to expand the domain of sandwich complexes. © 2010 Elsevier B.V.