Advanced Materials Research Vols. 219-220

Abstract: A new schiffbase ligand, methyl-2-pyridyl ketone benzoyl hydrazone (L), and its complexes with rare earth nitrates have been synthesized. These new complexes with the general formula of Ln(L)₂(NO₃)₃·nH₂O(where Ln = La, n = 5.5; Ce, Pr, n = 5; Nd, Eu, n = 4 ) were characterized by mass spectra, elemental analysis, IR spectra, thermal analysis, UV spectra, molar conductivity and luminescent spectra. All the complexes are stable in air. The results show that the lanthanide ion in each complex are coordinated by oxygen and nitrogen atoms of the ligand, the oxygen atoms of the nitrate and coordinated water molecules. The amide-oxygen atoms of L coordinate to the Ln ions in its keto-form. Tentative structures for the complexes have been proposed.

Abstract: A strong tracking filter based on suboptimal fading extended Kalman filter was proposed to ensure the perception for the motion state of underwater vehicles accurate in the paper. For the uncertainty of nonlinear system model, the strong tracking filter theory was introduced, orthogonality principle was put forward. Then suboptimal fading factor was pulled in, and extended Kalman filter for nonlinear system was established. The strong tracking filter was applied to data processing of underwater vehicle, and results indicate that it can effectively improve the accuracy and robustness of underwater navigation information.

Abstract: The reaction of 2-acetyl-2'-chloroacetanilide (L) with rare earth nitrates in CH₃CH₂OH followed by recrystallization in CH₃CH₂OH gave rise to colorless block crystals materials. The complexes and ligand were analyzed by FAB, elemental analysis(C, H, N), FT-IR spectra, TG-DTA, molar conductivity and X-ray single crystal diffraction. The fluorescence properties of ligand and the Eu (Ⅲ) complex also have been investigated. The results of crystal structure and spectral data show that the rare earth ions coordinated with oxygen and nitrogen atoms of the ligand, the nitrate and coordinated water molecules. The Eu (Ⅲ) complex material shows characteristic red emissions.

Abstract: Based on domestic and international study, this paper proposes an innovative Bertrand model and discusses its complex dynamics characteristics. Results show that the best choice for oligopoly is to reduce price adjustment speed and the satisfactory game result is to maintain equilibrium price. According to oligopolies’ game strategy, the paper uses parameters adjustment control method to make the chaotic state of price stable at the equilibrium state.

Abstract: This article selects the data of 28 hotel and tourism enterprises on A-shares in china. The investment risk early-warning system construction is based on the information entropy method and the BP neural network. The results show that most of Chinese hotel and tourism enterprises have a high level of investment risk due to the effects of financial crisis and operation, and all of them need to enhance prevention measures.

Abstract: In this paper, the analytical formulations among the damping factor and the other parameters are studied by Melnikov method for the classic second-order model of power system. The proximity of Melnikov method is analyzed by comparison between the obtained critical damping factor with the result by time-domain simulation method. It points out that this method exist great error in the range of engineering application. To solve this problem, an improved method is proposed to calculate the critical damping factor based on RBFNN. Finally, simulations show that it can effectively improve the calculation accuracy.

Abstract: Now, our sewage treatment industry mainly depends on the blower of aeration act as metabolic, absorbed in the toxic substances. Blower resources management is the key issue of sewage treatment. Traditional resource scheduling algorithm exist some defects, for example it can not well meet the quality requirements and can not get the optimal solution. This article gives a new resource scheduling method based on improved genetic algorithm. It achieves grid resource scheduling by using real number encoding and activities point crossover. Experiments show that genetic algorithm can reduce executing time and task completion time, and further improve the scalability of resource scheduling model. This algorithm has stability and high efficiency in grid environment.

Abstract: We propose a new automatic optical polarization demultiplexing method for NRZ-OOK and RZ-OOK polarization division multiplexed (PDM) system. The detected power differences of the radio frequency (RF) at low frequency are used as control signals which are sensitive to the angles between the states of polarization (SOP) of the polarization controller (PC) and the polarization beam splitter (PBS) at the demultiplexing side. The characteristics of the detected RF signals of NRZ-OOK and RZ-OOK are compared, and the best RF detection windows are calculated out through system simulation.

Abstract: With the use of energy, the pollution is more and more serious. As the largest pollution family, coal-fired power plant must control the pollution strictly. It established model of a coal-fired power plant SCR system, and simulated the denitration under different boiler load conditions, to get the denitration efficiencies and the regular of the denitration efficiency under different boiler load conditions. It can provide recommendations for practicality run in coal-fired power plant SCR system.

Abstract: Formal concept analysis and rough set theory provide two different methods for data analysis and knowledge processing. Knowledge reduct in this paper combines the two models. For an initial data sets described by formal context, look for absolute necessary attribute sets by applying rough set theory. The sets can image the concepts and hiberarchy structure completely. Then calculate the value cores of attributes values for all objects and delete redundant attributes. At last, delete repeated instances and get the minimum formal context. Construct the concept lattice of the minimum formal context can diminish the size of concept lattice of the initial table at a certain extent.