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- Manjun Ma, Hengsheng Tang, Wei Luo
- Applied Mathematics and Computation
- 2007

We establish conditions for the existence of periodic solutions of nonlinear, second-order difference equations of the form y(t + 2) + by(t + 1) + cy(t) = f (y(t)), where c = 0 and f : R → R is continuous. In our main result we assume that f exhibits sublinear growth and that there is a constant β > 0 such that u f (u) > 0 whenever |u| ≥ β. For such an… (More)

- Manjun Ma, Daoming Yang, Hengsheng Tang
- Applied Mathematics and Computation
- 2010

- Hengsheng Tang, Zhengqiu Zhang, Zhicheng Wang, Manjun Ma
- Computers & Mathematics with Applications
- 2010

- Hengsheng Tang, Yigang Li, +6 authors Lei Xu
- Optics express
- 2008

A semi-weakly confined waveguide structure was designed and fabricated. This waveguide structure has a 350 nm thin core layer. Its optical mode field is weakly confined in vertical direction but is strongly confined laterally. The waveguide can support a nearly circular optical field distribution that matches well with a single-mode fiber. An erbium-doped… (More)

- Hengsheng Tang, Wei Luo, Xu Li, Manjun Ma
- Computers & Mathematics with Applications
- 2008

This paper aims to show the existence of nontrivial solutions for discrete elliptic boundary value problems by using the " Mountain Pass Theorem ". Some conditions are obtained for discrete elliptic boundary value problems to have at least two nontrivial solutions. The results obtained improve the consequences of the known literature [Guang Zhang, Existence… (More)

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