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Hefei, China

Anhui University , colloquially known in Chinese as Anda , is located in Hefei, the capital city of Anhui Province, China. Founded in 1928 in Anqing, named 'National Anhui University' in 1946 and moved to Hefei in 1958, Anhui University is now supported by the government under Project 211. The university currently has approximately 27,000 students and 2500 staff including 1522 faculty members. Consisting of 14 college & faculties, Anhui University's broad-based education covers philosophy, economics, law, literature, history, science, engineering and management. Its motto is 'honest, resolute, erudite, discreet'. Anhui University has provided higher education in fundamental knowledge, professional skills, social responsibility and innovative concepts for over 170,000 students in the past 80 years. Additionally, the university hosted the 7th Forum for Presidents from Asian Universities in the year of its 80th anniversary.Anhui Province is rich in natural scenic spots and historic places of interest, such as, Mount Huangshan, listed by UNESCO as natural and cultural heritage and ancient folk houses in Xidi and Hongcun villages as cultural heritage; Mount Jiuhua, one of the four Buddhist shines; Mount Qiyun, one of the four Taoist shrines. With Yangzhi River and Huaihe River across Anhui province and with a galaxy of men of letters, Anhui has been famous for its rich and colorful local culture, especially, Hui culture in Southern Anhui and Huaihe culture in Northern Anhui. Wikipedia.

He S.,Anhui University | Liu F.,Jiangnan University
IEEE Transactions on Fuzzy Systems | Year: 2012

This paper studies the finite-time H ∞ control problem for time-delay nonlinear jump systems via dynamic observer-based state feedback by the fuzzy Lyapunov-Krasovskii functional approach. The Takagi-Sugeno (T-S) fuzzy model is first employed to represent the presented nonlinear Markov jump systems (MJSs) with time delays. Based on the selected Lyapunov-Krasovskii functional, the observer-based state feedback controller is constructed to derive a sufficient condition such that the closed-loop fuzzy MJSs is finite-time bounded and satisfies a prescribed level of H ∞ disturbance attenuation in a finite time interval. Then, in terms of linear matrix inequality (LMIs) techniques, the sufficient condition on the existence of the finite-time H ∞ fuzzy observer-based controller is presented and proved. The controller and observer can be obtained directly by using the existing LMIs optimization techniques. Finally, a numerical example is given to illustrate the effectiveness of the proposed design approach. © 1993-2012 IEEE. Source

Lou P.,Anhui University
Physical Chemistry Chemical Physics | Year: 2011

The edge reconstruction effect of the zigzag silicon carbide nanoribbons (zz SiC NRs) to a stable line of alternatively fused seven and five membered rings without and with H passivation have been studied using first principles density functional theory (DFT). The both side's edges of the pristine SiC are respectively terminated by Si and C atoms and are called the Si-edge and the C-edge, respectively. In the un-passivated systems, the C-edge reconstructed (Crc) could effectively lower the edge energy of the system, while the Si-edge reconstructed (Sirc) could raise the edge energy of the system. Thus, the Crc edge is the best edge for the edge reconstruction of the system, while the both edge reconstructed (brc) system is the metastability. Moreover, the brc system has a nonmagnetic metallic state, whereas the Crc system, as well as Sirc system, has a ferromagnetic metallic state. The edge reconstructed destroys the magnetic moment of the corresponding edge atoms. The magnetic moment arises from the unreconstructed zigzag edges. The pristine zz edge system has a ferrimagnetic metallic state. However, in the H-passivated systems, the unreconstructed zigzag edge (zz-H) is the best edge. The Crc-H system is the metastability. The Sirc-H system has only slightly higher energy than the Crc-H system, whereas the brc-H system of the pristine SiC NR has the highest edge energy. Thus, the H passivation would prevent the occurrence of edge reconstruction. Moreover, H passivation induces a metal-semiconductor transition in the zz and brc SiC NRs. Additionally, except for brc-H system which has non-magnetic semiconducting state, the zz-H, Crc-H, and Sirc-H systems have the magnetic state. © 2011 the Owner Societies. Source

Guo J.-Y.,Anhui University
Physical Review C - Nuclear Physics | Year: 2012

The similarity renormalization group is used to transform Dirac Hamiltonian into a diagonal form, which the upper (lower) diagonal element becomes an operator describing Dirac (anti-)particle. The eigenvalues of the operator are verfied to be in good agreement with that of the original Hamiltonian. Furthermore, the pseudospin symmetry is investigated. It is shown that the pseudospin splittings appearing in the nonrelativistic limit are reduced by the contributions from these terms relating the spin-orbit interactions, added by those relating the dynamical terms, and the quality of pseudospin symmetry origins mainly from the competition of the dynamical effects and the spin-orbit interactions. The spin symmetry of antiparticle spectrum is well reproduced in the present calculations. © 2012 American Physical Society. Source

Lou P.,Anhui University
Journal of Physical Chemistry C | Year: 2014

Despite their rich electronic and magnetic properties, the free-standing or suspending zigzag edge graphene nanoribbons with n chains (n-ZGRNs) can be twisted quite easily and buckle, which makes it difficult for nanoelectronics as well as spintronics applications. Using first principles density functional theory (DFT) calculations as well as classical molecular dynamic (MD) simulations, we propose a way to overcome this problem by modifying one edge of n-ZGRNs with (m,m)single-walled carbon nanotubes ((m,m)SWCNTs) into functionalized n-ZGRNs, namely nZGNR-(m,m)SWCNTs. DFT calculations indicate that the 8ZGNR and (6,6)SWCNT are predicted to form a 8ZGNR-(6,6)SWCNT without any obvious activation barrier. Moreover, the formed 8ZGNR-(6,6)SWCNT is more energetically favorable by about 1.86 eV. Hence, the nZGNR-(m,m)SWCNT should be found in experiment under mild conditions. MD simulations indicate that the nZGNR-(m,m)SWCNT possesses significantly improved mechanical and thermal stability as compared to a n-ZGNR, such that even at 1000 K the 6ZGNR-(6,6)SWCNT can remain straight. Excitingly, we find that one edge modification with -(m,m)SWCNT transforms the n-ZGNR into a ferromagnetic spin semiconductor. By simulation field-effect transistor (FET) doping, we demonstrate that in a nZGNR-(m,m)SWNT FET completely spin-polarized currents with reversible spin polarization can be created and controlled simply by applying a gate voltage. These findings should open a viable route for efficient spin-resolved band engineering in graphene-based devices with the current technology of the semiconductor industry. Finally, the origins of its unique electronic and magnetic properties as well as of its mechanical and thermal stabilities are discussed by using the band structures, partial charge densities of the bands at the Γ and X points, Mulliken charge analysis, as well as atomic configurations. © 2014 American Chemical Society. Source

Lu B.,Anhui University
Physics Letters, Section A: General, Atomic and Solid State Physics | Year: 2012

In this Letter, the fractional derivatives in the sense of modified Riemann-Liouville derivative and the Bäcklund transformation of fractional Riccati equation are employed for constructing the exact solutions of nonlinear fractional partial differential equations. The power of this manageable method is presented by applying it to several examples. This approach can also be applied to other nonlinear fractional differential equations. © 2012 Elsevier B.V. All rights reserved. Source

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