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Search Results: 1 - 10 of 52200 matches for " KUANG Fu-Hong "
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5,6-Dimethylpyrazine-2,3-dicarboxylic acid
Fu-Hong Liu
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536811052366
Abstract: The asymmetric unit of the title compound, C8H8N2O4, consists of one complete molecule and a second molecule generated by the application of twofold axis. The mean planes of the two carboxyl groups attached to the pyrazine ring at neighboring positions are twisted by 10.8 (1) and 87.9 (1)° in the complete molecule and 43.0 (1)° in the symmetry-generated molecule. The crystal packing features O—H...N hydrogen bonds, which link the molecules into layers along [101].
Fu-Hong Liu
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811035525
Abstract: The title compound {systematic name: poly[[μ7-(2R)-2-amino-3-sulfonatopropanoato]disodium]}, [Na2(C3H5NO5S)]n, was obtained through solvent-thermal reaction of l-cysteic acid and aqueous sodium hydroxide. The monomer consists of two Na+ cations that are coordinated to the deprotonated amino acid. The latter acts as donor utilizing all available coordination sites, viz. the amino, the carboxylate and the sulfonate residues, so producing a monomeric framework in which the two coordinated Na+ ions have different coordination spheres and geometries. One of the Na+ ions has an O5 coordination sphere with a typical geometric arrangement, intermediate between trigonal–bipyramidal and square–pyramidal; all the O atoms from the amino acid (three from the sulfonate and two from the caboxylate residues) act as donors. The second Na+ ion is tetracoordinated within an NO3 coordination sphere. The Na+ ion binds to the amino N atom, to one of the O atom of the carboxylic residue and to two O atoms of the sulfonate group in a distorted tetrahedral arrangement. As the sulfonate O atoms bind to both Na+ ions, a three-dimensional polymeric framework is obtained.
Generalized projective synchronization between two chaotic gyros with nonlinear damping

Min Fu-Hong,

中国物理 B , 2011,
Abstract: In this paper, the chaotic generalized projective synchronization of a controlled, noised gyro with an expected gyro is investigated by a simple control law. Based on the theory of discontinuous dynamical systems, the necessary and sufficient conditions for such a synchronization are achieved. From such conditions, non-synchronization, partial and full synchronizations between the two coupled gyros are discussed. The switching scenarios between desynchronized and synchronized states of the two dynamical systems are shown. Numerical simulations are illustrated to verify the effectiveness of this method.
Measurement and simulation of nitrogen leaching loss in hillslope cropland of purple soil

朱 波
,周明华,况福虹,汪 涛

中国生态农业学报 , 2013,
Abstract: Nitrogen leaching is one of the most important processes in nitrogen biogeochemical cycling. It is a nondeductible and difficult to obtain accurate nitrogen leaching flux for N cycling in agro-ecosystem. There is a wide distribution of purple soil in the Sichuan Basin with shallow soil layers and low hydraulic permeable parent rocks. Seepage water reaching soil-bedrock interface gathers to form the interflow flowing out of soil. Nitrate accumulated at soil profile and dissolved by seepage water moves via interflow, and consequently leaches from the soil profile. Therefore, nitrogen leaching was observable by interflow monitoring from hillslope cropland of purple soil. DNDC is a process-based biogeochemical model used globally to simulate greenhouse gas emission. It had not been well documented for modeling tests of nitrogen leaching especially in China. Sloping lysimeter in purple soils with large area coverage (32 m-2) were used to monitor seepage water discharge and nitrogen leaching loss flux. The DNDC model was validated and tested using observed data and used to simulate nitrogen leaching. Results showed that measured seepage water discharge was 323.6 mm with annual seepage coefficient of 33.3%. Nitrogen leaching flux was 36.93 kg·hm-2, accounting for 13.2% of total fertilizer nitrogen applied in winter wheat and summer maize rotation system. The simulated seepage water and nitrogen leaching fluxes well agreed with observed values with correlation coefficients of 0.944 (P < 0.05) and 0.972 (P < 0.05), respectively. The Theil coefficients were 0.07 and 0.1 for simulated water seepage and nitrogen leaching, respectively. Rainfall, soil porosity and applied nitrogen amount were highly sensitive modeling parameters. The simulated seepage water discharge and leached nitrogen flux from the purple soil of hillslope cropland were therefore reliable. Results indicated that DNDC as a process-based biog-eochemical model was applicable in quantitative studies on nitrogen leaching in purple soil at field scale. Furthermore, DNDC model was suitable for describing the characteristic processes of nitrogen leaching, especially in continuous rain conditions. It was feasible to test the model in modeling nitrogen leaching processes and regional estimation of nitrogen leaching loss.
α-Times Integrated C-Semigroups  [PDF]
Man Liu, Da-Qing Liao, Qian-Qian Zhu, Fu-Hong Wang
Advances in Pure Mathematics (APM) , 2012, DOI: 10.4236/apm.2012.23030
Abstract: The α-times integrated C semigroups, α > 0, are introduced and analyzed. The Laplace inverse transformation for α-times integrated C semigroups is obtained, some known results are generalized.
Influences of petroleum on accumulation of copper and cadmium in the polychaete Nereis diversicolor
SUN Fu-hong,ZHOU Qi-xing,ZHANG Qian-ru,
SUN Fu-hong
,ZHOU Qi-xing,ZHANG Qian-ru

环境科学学报(英文版) , 2006,
Abstract: Using the exposure simulation experiment, the action of petroleum affecting the accumulation of the trace metals including copper (Cu) and cadmium (Cd) in littoral polychaete Nereis diversicolor collected from the Shuangtaizi Estuary in Liaoning Pr
Generalized projective synchronization and adaptive synchronization for four dimensional hyperchaotic system

MIN Fu-hong,WANG Zhi-quan,

系统工程理论与实践 , 2008,
Abstract: 基于Lyapunov稳定性理论,设计合适的非线性反馈控制器以及参数更新规则,实现一类混沌系统的自适应广义投影同步.该控制器既可以适用于不包含未知参数的广义投影同步,又适用于包含未知参数的自适应广义投影同步.以新型四维超混沌系统为例,考虑含有未知参数和不含有未知参数的两种情况,从而实现驱动系统和响应系统渐近地达到所有状态向量的按照不同比例广义投影同步,同时辨识出系统的未知参数.数值模拟结果表明了所设计控制器的有效性.
Dislocated projective synchronization of Qi hyper-chaotic system and its application to secure communication

Min Fu-Hong,Wang En-Rong,

物理学报 , 2010,
Abstract: This paper focuses on a new type of dislocated projective synchronization, in which, the state variables of drive system and resporse system, at least one pair is required not to synchronize in proportion to the original corresponding state variable, but to realige the projective synchronization in proportion to dislocation relation of vectors. Here a new Qi hyper-chaotic system is taken for example, which has 23 synchronized schemes. Using the Lyapunov stability theory, a nonlinear controller is presented and a kind of disorder projective synchronization for Qi system is successfully completed. Then this method is applied to secure communication through improved chaotic masking. The information signal is mixed with the chaotic signal before being transmitted, and is recovered without distortion through the synchronized receiver. Simulation results show that the scheme has a good performance.
Coupled synchronization of the unified chaotic system

Min Fu-Hong,Wang Zhi-Quan,

物理学报 , 2005,
Abstract: This paper investigates the synchronization of two linearly coupled unified chaotic systems. A new sufficient condition of global asymptotic synchronization is attained from the theory of stability of time-varying systems. In addition, compared with the previously proposed method, the sufficient condition for the synchronization of two linearly coupled unified chaotic systems is simpler and le ss conservative, and the range of coupled coefficients is wider. Numerical simul ation shows the effectiveness and feasibility of this method.
Generalized projective synchronization of two four-dimensional chaotic systems

Min Fu-Hong,Wang Zhi-Quan,

物理学报 , 2007,
Abstract: In this paper, the generalized projective synchronization has been observed in the coupled four_dimensional chaotic systems. The different nonlinear feedback controllers are designed by an active control method for synchronization of two chaotic systems with the same or different structures. The proposed technique allows us to arbitrarily direct the scaling factor to a desired value. Numerical simulation is provided to show the effectiveness of the theoretical analysis.
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