Changzhi, China

Changzhi University

www.czc.edu.cn
Changzhi, China
SEARCH FILTERS
Time filter
Source Type

Zhang J.-T.,Beijing Normal University | Ru W.,Changzhi University
Population Ecology | Year: 2010

The conservation of the endemic, endangered, and first-class protected tree species, Taxus chinensis var. mairei (Lem. & H. Lev.) W. C. Cheng & L. K. Fu, is urgent in China. To assist the protection of this important medicinal plant species, the biological and ecological characteristics of its populations were investigated and analyzed in Shanxi. The study area, southeastern Shanxi, is a special region suitable for this species growth and development. The floristic composition, life form spectrum, and species diversity of T. chinensis var. mairei forests reflected the features of both warm-temperate and subtropical regions. Size classes in DBH and static life table analysis showed that the population structure of T. chinensis var. mairei was of the increase-type. Plant density, survivorship, and mortality decreased with increase in age. Distribution patterns of individuals were basically clumped and saplings tended to be distributed randomly. Disturbance from collection of leaves, branches, and stems for medicine was an important factor affecting population structure, dynamics, and distribution. The sex ratio of female/male and the efficiency of sexual reproduction were very low. The main way of reproduction for this species is vegetative propagation. Based on these characteristics, some suggestions, such as establishing nature reserves, improving population structure by cultivation and transplantation, developing seed gardens, and plantations, etc., for the conservation management of T. chinensis var. mairei and its forests in Shanxi are discussed. © 2010 The Society of Population Ecology and Springer.


Lian W.,Changzhi University
Electronics Letters | Year: 2015

To address feature matching problem where there is only partial overlap between the two feature sets, minimisation of an energy function consisting of feature matching costs and a concave regularisation term capable of handling partial overlaps is proposed. To improve robustness to disturbances, a path following strategy for minimisation which dynamically combines weights of the two terms is adopted. Experimental results verify better performance of the method over several state-of-the-art methods. © The Institution of Engineering and Technology 2015.


To study the relationship between plasma riboflavin levels and esophageal squamous cell carcinoma. We detected and compared plasma concentrations of riboflavin in patients with esophageal squamous cell carcinoma (ESCC) and immigrants of Linzhou living in Changzhi. Plasma riboflavin levels were quantified in 445 ESCC patients, 689 healthy control subjects and 347 immigrants of Linzhou living in Changzhi by using enzyme-linked immunosorbent assay. The plasma riboflavin levels in patients with ESCC were significantly lower than those in the healthy controls and immigrants of Linzhou living in Changzhi [(731.69 ± 330.67) μg/L vs (1090.43 ± 445.08) μg/L, (731.69 ± 330.67) μg/L vs (897.58 ± 177.78) μg/L, respectively, all P < 0.05], and the plasma riboflavin levels of the healthy controls were higher than those in the immigrants of Linzhou living in Changzhi (P < 0.05). Patients with ESCC have decreased plasma riboflavin levels as compared with the healthy controls and immigrants of Linzhou living in Changzhi, there exists a lack of riboflavin in ESCC patients, but the specific mechanism needs further study.


Hao R.,Changzhi University
Optics and Laser Technology | Year: 2011

In this paper, we present the (1+1)-dimensional inhomogeneous nonlinear Schrödinger (NLS) equation that describes the propagation of optical waves in nonlinear optical systems exhibiting optical lattice, inhomogeneous nonlinearity and varying diffraction at the same time. A series of interesting properties of spatial solitons are found from the numerical calculations, such as the stable propagation in the a nonperiodic optical lattice induced by periodic diffraction variations and periodic nonlinearity variations. Finally, the interaction of neighboring spatial solitons in a nonperiodic optical lattice is discussed, and the results reveal that two spatial solitons can propagate periodically and separately in the optical lattice without interaction. © 2010 Elsevier Ltd. All rights reserved.


Lian W.,Changzhi University
Electronics Letters | Year: 2015

A new non-rigid feature point matching algorithm is proposed, where the non-rigid global deformation is preserved by dividing the object into several overlapping local regions and only regularising the deformations of the local regions. A key property of the proposed algorithm is that the objective function is concave. By combining with the total unimodularity of the constraints, the proposed algorithms can be proved to directly yield integer valued solutions. Experimental results demonstrate the better robustness of the method over several state-of-the-art methods. © The Institution of Engineering and Technology 2015.


Shi L.,Changzhi University | Yang Z.,CAS Beijing National Laboratory for Molecular
European Journal of Organic Chemistry | Year: 2016

The Pauson-Khand reaction (PKR) is used to construct a cyclopentenone framework from an alkene, an alkyne, and carbon monoxide, through a domino sequence of bond constructions. This microreview covers the synthetic application of the PKR in the total synthesis of a collection of structurally challenging natural products in the authors' laboratory over the past 10 years, beautifully exploring the complexity-generating features of the PKR. Key to the success of these total syntheses is the implementation of the PKR to access complex target molecules containing numerous stereocenters. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Hao R.,Changzhi University
Optics Communications | Year: 2012

In this paper, we present the (1 + 1)-dimensional inhomogeneous nonlinear Schrödinger (NLS) equation, which describes the propagation of light in optical lattice with nonlinear double-well structure. A series of interesting properties of light beam are presented in the optical systems numerically, such as the regular splitting process and stationary localized mode induced by the varying diffraction, the inhomogeneity, and the nonlinear double-well structure.© 2011 Elsevier B.V. All rights reserved.


Thin films of Ag-doped ZnO (SZO) were grown by pulsed laser deposition on Si (111) substrates, using a KrF excimer laser with the wavelength of 248 nm. The effects of Ag-doping on the microstructure and electronic properties of the ZnO thin films were studied by X-ray diffraction and temperature coefficient of resistance (TCR) curve. All the SZO films have shown orientation in the (002) direction and the (002) peak first shifts to low degree and then to high degree with the increasing of Ag-doping concentration. The TCR values are strongly affected by Ag amounts and deposition temperature. The best value of TCR (-17.5%/K) is observed at 244 K for 10SZO thin film grown at 350 °C, which could be used as a candidate material for bolometer or other photoelectronic devices. © 2015 Elsevier Ltd.


In this paper, in the framework of (1+1)-dimensional inhomogeneous nonlinear Schrödinger (NLS) equation, the relevant problem of optical soliton control in inhomogeneous Kerr-type nonlinear media with PT-symmetric external potentials is investigated numerically. Particularly, the stable propagation of one, two, and three solitons in this optical setting is displayed. Moreover, the controllable parameter for optical soliton control is found. Finally, the stability of soliton control with respect to random perturbations is also studied. © 2014 Elsevier B.V.


Lian W.,Changzhi University | Zhang L.,Hong Kong Polytechnic University | Zhang D.,Hong Kong Polytechnic University
IEEE Transactions on Image Processing | Year: 2012

This paper addresses the problem of rotation-invariant nonrigid point set matching. The shape context (SC) feature descriptor is used because of its strong discriminative nature, whereas edges in the graphs constructed by point sets are used to determine the orientations of SCs. Similar to lengths or directions, oriented SCs constructed this way can be regarded as attributes of edges. By matching edges between two point sets, rotation invariance is achieved. Two novel ways of constructing graphs on a model point set are proposed, aiming at making the orientations of SCs as robust to disturbances as possible. The structures of these graphs facilitate the use of dynamic programming (DP) for optimization. The strong discriminative nature of SC, the special structure of the model graphs, and the global optimality of DP make our methods robust to various types of disturbances, particularly clutters. The extensive experiments on both synthetic and real data validated the robustness of the proposed methods to various types of disturbances. They can robustly detect the desired shapes in complex and highly cluttered scenes. © 1992-2012 IEEE.

Loading Changzhi University collaborators
Loading Changzhi University collaborators