Zhi-gang Wang

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In the present paper, the authors introduce two new subclasses C (k) (λ, α) of close-to-convex functions and QC (k) (λ, α) of quasi-convex functions with respect to k-symmetric points. The integral representations and convolution conditions for these classes are provided. Some coefficient inequalities for functions belonging to these classes and their(More)
OBJECTIVE : Several previous studies have reported the role variant of ERCC1 rs3212986 and ERCC2 rs13181 polymorphisms in the risk of glioma, but the results of these studies are inconsistent. Therefore, we aimed to conduct a meta-analysis to investigate the role of ERCC1 rs3212986 and ERCC2 rs13181 on the risk of glioma. METHODS A comprehensive research(More)
Titanium alloys have been widely used in the aerospace, biomedical and automotive industries because of their good strength-to-weight ratio and superior corrosion resistance. However, it is very difficult to machine them due to their poor machin-ability. When machining titanium alloys with conventional tools, the tool wear rate progresses rapidly, and it is(More)
A type of electron pairing model with spin-orbit interactions or Zeeman coupling is solved exactly in the framework of the Richardson ansatz. Based on the exact solutions for the case with spin-orbit interactions, it is shown rigorously that the pairing symmetry is of the p + ip wave and the ground state possesses time-reversal symmetry, regardless of the(More)
Let Q(α, β, γ) denote the class of functions of the form f (z) = z + a 2 z 2 + · · · , which are analytic in the unit disk U = {z : |z| < 1} and satisfy the condition {α(f (z)/z) + βf The extreme points for this class are provided, the coefficient bounds and radius of univalency for functions belonging to this class are also provided. The results presented(More)
This paper presents a nonlinear dynamic model for simulation and analysis of a kind of parametrically excited vibration of stay cable caused by support motion in cable-stayed bridges. The sag, inclination angle of the stay cable are considered in the model, based on which, the oscillation mechanism and dynamic response characteristics of this kind of(More)
In this article, we assume that there exist scalar D * ¯ molecular states, and study their masses using the QCD sum rules. The numerical results indicate that the masses are about (250 − 500) MeV above the corresponding s thresholds, the Y (4140) is unlikely a scalar D * s ¯ D * s molecular state. The scalar D s molecular states maybe not exist, while the(More)
To report clinical outcomes of kidney transplantation from pediatric brain and cardiac death donors (DBCD) in a single Chinese center and to investigate its feasibility to expand organ donor pool. 18 recipients, transplanted between August 2011 and October 2013 in the First Affiliated Hospital of Zhengzhou University, receive a single graft from DBCD donors(More)
In this article, we calculate the axial and the induced pseudoscalar form-factors G A (t = −Q 2) and G P (t = −Q 2) of the nucleons in the framework of the light-cone QCD sum-rules approach up to twist-6 three valence quark light-cone distribution amplitudes, and observe that the form-factors G A (t = −Q 2) and G P (t = −Q 2) at intermediate and large(More)