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In the present study we report the pulse electro-deposition technique from aqueous solution containing CuCl2, InCl2, SeO2 and EDTA to preparation CuInSe2 thin film on conducting glass. The detailed investigation of the Current den...
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In the present study we report the pulse electro-deposition technique from aqueous solution containing CuCl2, InCl2, SeO2 and EDTA to preparation CuInSe2 thin film on conducting glass. The detailed investigation of the Current density, pH value and ion concentration effect on CuInSe2 thin film generation during the deposition. The bulk structure of CuInSe2 layer were determined by X-Ray, scanning electron microscopy, EDX and photoelectron chemical studies. The results indicated that the Cu ion deposition can be suppressed via EDTA base solution. Base on the experimental results we can get better composition thin film, the composition ratio approach of the CIS film as 21.62 ％Cu, 28.85 ％In and 49.53％Se.
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This paper presents a Representation Framework for Domain Knowledge based on the analysis of Chinese festival by ontology analysis approach; it also discusses the organization method for describing domain data based on ontology. A...
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This paper presents a Representation Framework for Domain Knowledge based on the analysis of Chinese festival by ontology analysis approach; it also discusses the organization method for describing domain data based on ontology. At the same time, the paper summarizes the ontology study domain. It is conceptualized using method of domain knowledge by the framework, and that is to say, to construct the concept, the taxonomy of concept and the concept properties for the domain knowledge is based on ontology.
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This paper proposes a position-based visual servoing controller for quadrotors to hover above and track a ground target in Global Positioning System denied environment. A vision-based position estimation system fuses the monocular...
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This paper proposes a position-based visual servoing controller for quadrotors to hover above and track a ground target in Global Positioning System denied environment. A vision-based position estimation system fuses the monocular camera image data, inertial measurement units data, and ultrasonic sensor data to estimate the position of the ground target relative to quadrotors. The experimental results validate the performance of the proposed robust position controller.
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A new initial of alignment of Strapdown inertial navigation system (SINS) based on the fuzzy Kalman filter is proposed. Fuzzy logic has been incorporated to tune the system error covariance of the filter in the initial alignment p...
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A new initial of alignment of Strapdown inertial navigation system (SINS) based on the fuzzy Kalman filter is proposed. Fuzzy logic has been incorporated to tune the system error covariance of the filter in the initial alignment process. The simulation results have shown that the using of fuzzy Kalman filter for initial alignment can improve the consistency of the filter and the estimation accuracy. In the meantime the alignment time is reduced considerably.
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A new initial of alignment of Strapdown inertial navigation system (SINS) based on the fuzzy Kalman filter is proposed. Fuzzy logic has been incorporated to tune the system error covariance of the filter in the initial alignment p...
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A new initial of alignment of Strapdown inertial navigation system (SINS) based on the fuzzy Kalman filter is proposed. Fuzzy logic has been incorporated to tune the system error covariance of the filter in the initial alignment process. The simulation results have shown that the using of fuzzy Kalman filter for initial alignment can improve the consistency of the filter and the estimation accuracy. In the meantime the alignment time is reduced considerably.
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Because of the poor observability of Inertial Navigation System on stationary base, the estimation error of the azimuth will converge very slowly in initial alignment by means of Kalman filtering, and making the time initial align...
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Because of the poor observability of Inertial Navigation System on stationary base, the estimation error of the azimuth will converge very slowly in initial alignment by means of Kalman filtering, and making the time initial alignment is longer. In this paper, a fast estimation method of the azimuth error is creatively proposed for the initial alignment of INS on stationary base. On the basis of the fast convergence of the leveling error, the azimuth error can be directly calculated. By means of this fast initial alignment method, the time of initial alignment is reduced greatly. The computer simulation results illustrate the efficiency of the method.
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A learning algorithm for multiplayer neural network based on the Kalman filter theory is studied. The theoretical proof and procedure of the algorithm are described in details, and using the algorithm to the initial alignment of t...
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A learning algorithm for multiplayer neural network based on the Kalman filter theory is studied. The theoretical proof and procedure of the algorithm are described in details, and using the algorithm to the initial alignment of the inertial system. Simulation results proved the availability of the neural network algorithm for initial alignment of nonlinear inertial system, not only can surely obtain alignment accuracy which is similar to that of the Kalman filter, but also the alignment time is reduced considerably. Consequently, a available algorithm of the neural network for the initial alignment of nonlinear inertial system is discovered.
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A general and procedural algorithm for Z-matrix building is proposed in this paper. This algorithm can be accomplished by an improved search technique to choose the tree branch set ('IS) and link branch set (LS) and is easily impl...
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A general and procedural algorithm for Z-matrix building is proposed in this paper. This algorithm can be accomplished by an improved search technique to choose the tree branch set ('IS) and link branch set (LS) and is easily implemented for a network containing the controlled sources. The look-up table saved during the search process of TS is fully utilized to reduce the computational amount when formulating the transitional matrix MIB. During the construction of another transitional matrix MRV, the applications of different kinds of controlled sources are discussed thoroughly considering the characteristics of the current-controlled sources and vohage-controlled sources,respectively. With these two matrices, the relationships between the bus current injections, branch currents and bus voltages can easily be found. Numerical example shows that the proposed method is very effective and suitable to be used for the analysis of large-scale power systems.
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β-tricalcium phosphate(TCP, Ca_3(PO_4)_2) ceramics are preferred as a bioceramics because of its chemical stability and reasonable degradation rate in vivo, but it is difficult to obtain β-TCP ceramics with high compressive stre...
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β-tricalcium phosphate(TCP, Ca_3(PO_4)_2) ceramics are preferred as a bioceramics because of its chemical stability and reasonable degradation rate in vivo, but it is difficult to obtain β-TCP ceramics with high compressive strength at lower temperature than that of phase transition to α-TCP. In this study, the sintering behavior of TCP, Ca_2P_2O_7-doped TCP, and CaCO_3-doped TCP in the range of 2wt%～5wt% were investigated respectively. Phase transition of pure TCP took place between 1100℃ to 1150℃, and pure β-TCP ceramics could achieve a compressive strength of only 3MPa. However, calcium pyrophosphate (CPP, Ca_2P_2O_7) additive prevented the transformation of β-TCP to α-TCP, but the second phase of CPP was observed in the resultant ceramics. Phase transition of TCP ceramics by addition of both CPP and calcium carbonate (CC, CaCO_3) took place between 1200℃ to 1250℃ and the resultant TCP ceramics had few impurity of CPP. By adding CPP and CC to TCP, final ceramics with compressive strength over 12MPa could be obtained when sintered at 1200℃ for 2hrs.
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摘要 :
β-tricalcium phosphate(TCP, Ca_3(PO_4)_2) ceramics are preferred as a bioceramics because of its chemical stability and reasonable degradation rate in vivo, but it is difficult to obtain β-TCP ceramics with high compressive stre...
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β-tricalcium phosphate(TCP, Ca_3(PO_4)_2) ceramics are preferred as a bioceramics because of its chemical stability and reasonable degradation rate in vivo, but it is difficult to obtain β-TCP ceramics with high compressive strength at lower temperature than that of phase transition to α-TCP. In this study, the sintering behavior of TCP, Ca_2P_2O_7-doped TCP, and CaCO_3-doped TCP in the range of 2wt%～5wt% were investigated respectively. Phase transition of pure TCP took place between 1100℃ to 1150℃, and pure β-TCP ceramics could achieve a compressive strength of only 3MPa. However, calcium pyrophosphate (CPP, Ca_2P_2O_7) additive prevented the transformation of β-TCP to α-TCP, but the second phase of CPP was observed in the resultant ceramics. Phase transition of TCP ceramics by addition of both CPP and calcium carbonate (CC, CaCO_3) took place between 1200℃ to 1250℃ and the resultant TCP ceramics had few impurity of CPP. By adding CPP and CC to TCP, final ceramics with compressive strength over 12MPa could be obtained when sintered at 1200℃ for 2hrs.
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