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Chen Y.,Luoyang Normal University
Sensor Letters | Year: 2017

Traditional training methods for gait rehabilitation require manual works of rehabilitation therapists, which needs high working strength. Thus the rehabilitation training is restrained and the rehabilitation efficacy is affected. Therefore, it is of great significance to develop a kind of intelligent training system for rehabilitation of lower limbs as well as a set of corresponding rehabilitation training methods. Firstly, this study analyzed the gait movement trail of lower limbs. Then, a multi-sensor sensing acquisition module designed by using the bio-mechanics sensor was used to acquire gait information of lower limb-injured athletes. According to the data analysis of the acquisition module, this study designed and constructed a set of training machine system for lower limb rehabilitation. Such system could reasonably judge and correct the gait rehabilitation training according to collected gait information. The flexi-force pressure sensor in thin film type mentioned in this study was characterized by high voltage output, good flexibility and processability and high strength of mechanical properties, etc., which laid a collecting basis for the whole design of the system. The practicability of the system was verified through analysis of the collected data results, which could provide references for the future study of the rehabilitation training machine. Copyright © 2017 American Scientific Publishers All rights reserved.


Wang H.,Beijing Normal University | Wang W.,Luoyang Normal University | Jin W.J.,Beijing Normal University
Chemical Reviews | Year: 2016

The σ-hole and π-hole are the regions with positive surface electrostatic potential on the molecule entity; the former specifically refers to the positive region of a molecular entity along extension of the Y-Ge/P/Se/X covalent σ-bond (Y = electron-rich group; Ge/P/Se/X = Groups IV-VII), while the latter refers to the positive region in the direction perpendicular to the σ-framework of the molecular entity. The directional noncovalent interactions between the σ-hole or π-hole and the negative or electron-rich sites are named σ-hole bond or π-hole bond, respectively. The contributions from electrostatic, charge transfer, and other terms or Coulombic interaction to the σ-hole bond and π-hole bond were reviewed first followed by a brief discussion on the interplay between the σ-hole bond and the π-hole bond as well as application of the two types of noncovalent interactions in the field of anion recognition. It is expected that this review could stimulate further development of the σ-hole bond and π-hole bond in theoretical exploration and practical application in the future. © 2016 American Chemical Society.


The solubility of 2,4-dichlorophenoxyacetic acid in toluene, tetrachloromethane and the binary solvent mixtures of (cyclohexane + ethyl acetate) was determined from 293.15 K to 341.05 K using a synthetic method. Modified Apelblat and polynomial empirical equations were proposed to correlate the experimental solubility data. The fusion point temperature and enthalpy of fusion were determined by DSC. In addition, activity coefficients of 2, 4-dichlorophenoxyacetic acid, enthalpies of dissolution of the resulting solutions were estimated. © 2013 Elsevier B.V. All rights reserved.


Feng H.Q.,Luoyang Normal University | Wang J.M.,Luoyang Normal University
Astrophysical Journal | Year: 2015

Interplanetary coronal mass ejections (ICMEs) often show unusual plasma compositional signatures (high He/P ratio, high ratio, and high Fe charge states), and their enhanced charge states of oxygen and iron are caused by flare-related heating in the corona. We investigated the abnormal plasma composition of small interplanetary magnetic flux ropes (IMFRs) in terms of He/P ratio, ratio, and mean Fe charge state. We discover that 18 of the 24 small IMFRs showed high He/P ratios. In addition, 12 and 8 of the 24 events showed high Fe charge states and ratios, respectively. This observation implies that these small IMFRs and ICMEs may be caused by the same coronal eruptions. © 2015. The American Astronomical Society. All rights reserved..


Pan L.,Luoyang Normal University | Ding C.,Luoyang Normal University | Wang H.,Luoyang Normal University
Optics Express | Year: 2014

The expression of spectral density of cosine-Gaussian-correlated Schell-model (CGSM) beams diffracted by an aperture is derived, and used to study the changes in the spectral density distribution of CGSM beams upon propagation, where the effect of aperture diffraction is emphasized. It is shown that, comparing with that of GSM beams, the spectral density distribution of CGSM beams diffracted by an aperture has dip and shows dark hollow intensity distribution when the order-parameter n is big enough. The central intensity increases with increasing truncation parameter of aperture. The comparative study of spectral density distributions of CGSM beams with aperture and that of without aperture is performed. Furthermore, the effect of order-parameter n and spatial coherence of CGSM beams on the spectral density distribution is discussed in detail. The results obtained may be useful in optical particulate manipulation. © 2014 Optical Society of America.


Wang F.,Luoyang Normal University
Journal of Global Optimization | Year: 2011

Recently, Xu (J Glob Optim 36:115-125 (2006)) introduced a regularized proximal point algorithm for approximating a zero of a maximal monotone operator. In this note, we shall prove the strong convergence of this algorithm under some weaker conditions. © Springer Science+Business Media, LLC. 2010.


Liu Z.-L.,Luoyang Normal University
Computer Physics Communications | Year: 2014

The algorithm and testing of the Multi-algorithm-collaborative Universal Structure-prediction Environment (Muse) are detailed. Presently, in Muse I combined the evolutionary, the simulated annealing, and the basin hopping algorithms to realize high-efficiency structure predictions of materials under certain conditions. Muse is kept open and other algorithms can be added in future. I introduced two new operators, slip and twist, to increase the diversity of structures. In order to realize the self-adaptive evolution of structures, I also introduced the competition scheme among the ten variation operators, as is proved to further increase the diversity of structures. The symmetry constraints in the first generation, the multi-algorithm collaboration, the ten variation operators, and the self-adaptive scheme are all key to enhancing the performance of Muse. To study the search ability of Muse, I performed extensive tests on different systems, including the metallic, covalent, and ionic systems. All these present tests show that Muse has very high efficiency and 100% success rate. © 2014 Elsevier B.V. All rights reserved.


Wang W.,Luoyang Normal University
Journal of Physical Chemistry A | Year: 2011

The Cambridge Structure Database search shows that there are over seventy crystal structures containing halogen bonds in which hypervalent halogens, not monovalent halogens as usual, behave as acceptors of electron density. The nature of the halogen bond involving hypervalent halogen has been investigated by using several theoretical methods with different basis sets. The HF calculations for the complexes studied cover most of their binding energies, which indicates the electrostatic nature of the halogen bond involving hypervalent halogen. The MP2 methods with medium basis sets fail to predict the relative strength of the halogen bond involving hypervalent halogen and the corresponding halogen bond involving monovalent halogen. Accurate computational results show that the halogen bond involving hypervalent halogen may be weaker than the corresponding halogen bond involving monovalent halogen even in the case that the hypervalent halogen is more positively charged than the monovalent halogen, the reasons of which were discussed in some detail. In comparison with the halogen bond involving monovalent halogen, the bonding characteristic and electron-density transfer of the halogen bond involving hypervalent halogen were also analyzed with the "atoms in molecules" theory and the natural bond orbital theory. © 2011 American Chemical Society.


Wang F.,Luoyang Normal University | Cui H.,Luoyang Normal University
Journal of Global Optimization | Year: 2012

In this paper we consider the contraction-proximal point algorithm: x n+1 = αnu + λn xn + γnJβnxn, where Jβn denotes the resolvent of a monotone operator A. Under the assumption that limn αn = 0,Σn αn = ∞, lim infn βn > 0, and lim inf n γn > 0, we prove the strong convergence of the iterates as well as its inexact version. As a result we improve and recover some recent results by Boikanyo and Morosanu. © Springer Science+Business Media, LLC. 2011.


Xue L.,Luoyang Normal University
Physica A: Statistical Mechanics and its Applications | Year: 2012

In this paper, spatial dynamics in the Beddington-DeAngelis predator-prey model with self-diffusion and cross-diffusion is investigated. We analyze the linear stability and obtain the condition of Turing instability of this model. Moreover, we deduce the amplitude equations and determine the stability of different patterns. Numerical simulations show that this system exhibits complex dynamical behaviors. In the Turing space, we find three types of typical patterns. One is the coexistence of hexagon patterns and stripe patterns. The other two are hexagon patterns of different types. The obtained results well enrich the finding in predator-prey models with Beddington-DeAngelis functional response. © 2012 Elsevier B.V. All rights reserved.

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