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.
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.
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.
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.
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.
Wang Z.,Anhui University |
Yu B.,Anhui University
Laser Physics Letters | Year: 2014
A scheme is proposed for high-precision two-dimensional atom localization in a four-level tripod-type atomic system via measurement of the excited state population. It is found that because of the position-dependent atom-field interaction, the precision of 2D atom localization can be significantly improved by appropriately adjusting the system parameters. Our scheme may be helpful in laser cooling or atom nanolithography via high-precision and high-resolution atom localization. © 2014 Astro Ltd.
Lou P.,Anhui University
Journal of Materials Chemistry C | Year: 2013
Based on density functional theory and nonequilibrium Green's function method, we systematically investigated the hydrogenated effects on the stability, electronic and magnetic properties, as well as electronic spin transport property of an N chains zigzag silicon carbide nanoribbon (N-ZSiC NR). Our calculated results indicate that by controlling the hydrogen content of the environment, one can get three types of stable edge hydrogenated ZSiC NRs. They are: (a) each edge Si and C atom bonded with one hydrogen atom (N-ZSiC-1H1H), (b) each edge Si atom bonded with two H atoms and each edge C bonded with one H atom (N-ZSiC-2H1H), and (c) each edge Si and C atom bonded with two H atoms (N-ZSiC-2H2H). It was unexpectedly found that N-ZSiC-1H1H NR, which has been studied theoretically to a large extent, is stable only at extremely low ultravacuum pressures. Under more standard conditions, the most stable edge hydrogenated structure is N-SiC-2H2H NR. More interestingly, when N ≤ 4, the N-ZSiC-2H2H NR is a nonmagnetic semiconductor, while when 5 ≤ N ≤ 7, it is a ferrimagnetic ferromagnetic semiconductor. When N ≥ 8, the N-SiC-2H2H NR turns into a ferrimagnetic half-metallic. As regards the N-ZSiC-2H1H NR, when N ≤ 12, it is a ferromagnetic semiconductor, while when N ≥ 13, it becomes a ferromagnetic half-metallic. These results manifest that by controlling the hydrogen content of the environment and the temperature, as well as the ribbon width N, one can precisely modulate the electronic and magnetic properties of N-ZSiC NRs, which endows ZSiC NRs with many potential applications in spintronics and nanodevices. © 2013 The Royal Society of Chemistry.
Guo T.L.,Anhui University
Computers and Mathematics with Applications | Year: 2012
In this paper, we deal with the controllability and observability of impulsive fractional linear time-invariant (IF-LTI for short) system. Our main purpose is to built some necessary and sufficient conditions of controllability and observability for the IF-LTI system. At the same time, we establish some conclusions of controllability and observability for a continuous fractional LTI system, which is a special case of the IF-LTI system. Examples are given to illustrate our results. © 2011 Elsevier Ltd. All rights reserved.
Wu R.,Anhui University
Nonlinear Analysis: Real World Applications | Year: 2010
In the current paper, BAM neural networks with time-varying coefficients and distributed time delays are studied. Sufficient conditions guaranteeing the exponential componentwise convergence and existence of one unique periodic solution are obtained by the comparison principle, continuation theorem of topological degree and inequality techniques. The boundedness and differentiability of activation functions are removed. The obtained sufficient criteria are easy to verify and are hence very useful in applications. © 2009.
Zhou L.,Anhui University |
Chen H.,Anhui University
Knowledge-Based Systems | Year: 2012
We introduce a wide range of linguistic generalized power aggregation operators. First, we present the generalized power average (GPA) operator and the generalized power ordered weighted average (GPOWA) operator. Then we extend the GPA operator and the GPOWA operator to linguistic environment and propose the linguistic generalized power average (LGPA) operator, the weighted linguistic generalized power average (WLGPA) operator and the linguistic generalized power ordered weighted average (LGPOWA) operator, which are aggregation functions that use linguistic information and generalized mean in the power average (PA) operator. We give their particular cases such as the linguistic power ordered weighted average (LPOWA) operator, the linguistic power ordered weighted geometric average (LPOWGA) operator, the linguistic power ordered weighted harmonic average (LPOWHA) operator and the linguistic power ordered weighted quadratic average (LPOWQA) operator. Finally, we develop an application of the new approach in a multiple attribute group decision making problem concerning the evaluation of university faculty for tenure and promotion. © 2011 Elsevier B.V. All rights reserved.