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Magnesium oxysulfate cement (MOS) pastes mixed with different amounts of fly ash were tested on the compressive strength. The examinations of strength development, phase compositions and microstructure of MOS cement are discussed in detail. Results showed that the compressive strength of MOS cement specimens decreased with increasing fly ash content from 0% to 50% at the curing age 1 day. Moreover,...
In this paper, we propose an approach for text-independent speaker verification system usage both cepstral and prosodic features. We combine MFCC features and pitch contour features to capture the characteristics in speaker verification. We are using cubic polynomials to estimate the pitch contour segments in order to model the differences on intonation contour, and using the support vector machine...
Based on the reciprocity theorem, the far field formulation in the frequency domain of an arbitrarily oriented electric dipole located above the interface of the half space is deduced. Then the radiation patterns of an arbitrarily oriented helical antenna over half-space are given. The results show that this formulation can be applied to fast calculation the far radiation field of an antenna located...
Integrating three-phase induction motor electromagnetic calculation program and multi-objective inverse optimization algorithm, a multi-objective & inverse three-phase induction motor optimization system with C++ is realized. This system can optimal design three-phase induction motor automatically. The design examples verify the effectiveness of the system.
The disturbance-compensation of ball screw servo system composed of AC permanent magnet synchronous motor (PMSM) is studied. The disturbance which is produced by variation of system parameters, machinery nonlinear etc, is estimated, based on the derived model, and which is fed back to input port as a compensation signal. The simulation and experimental results show that the ball screw servo system...
500kV and the above transformer substation always select 3/2 connection mode, its structure of the main connection and the protection disposition have its own characteristics. This paper established the initial decision table of fault diagnosis based on analyzing the 3/2 connection system protection trip strategies. Depending on the reduced attribute set based on the rough set theory, we constructed...
Brand trust refers to consumer's faith or confidence in order to avoid risks of a particular brand in the face of risk. In this paper, the connotation of brand trust was reviewed and analysis the impact of antecedent factors. At last, the paper proposes future research trends and analysis that the future research should be focused on dimensions of brand trust and analysis the impact of brand trust...
The orientation of university from a legal point of views is the choice of powers and rights. This choice reflects the game of Order and freedom in legal value. The study of the university orientation should establish the coordinate system that reflects the main features of the university. By orienting between powers and rights, leading the rights of university of conscious, training the university...
A summary of the evaluation standard of the existing assessment system for green building is made in this paper, and a set of the green building evaluation index system is established, furthermore, abided by the comprehensive evaluation theory, the comprehensive fuzzy evaluation model of green building design is brought out to provide a quantitative method to make the evaluation of green building...
An aircraft reenters or flies at hypersonic speed through the atmosphere is surrounded by plasma sheath that affects on the radiation characteristics of an antenna. According to actual problems, the Navier-Stokes equations is solved using the more effective and stable AUSMPW+ scheme. The calculated electron density distribution in the sheath is concerned with the flow structure which is shown to be...
The extended Propagation-Inside-Layer Expansion (EPILE) combined with the Forward-Backward method (FBM) is applied to research the composite electromagnetic scattering from the conducting targets above and below the dielectric rough surface. The established integral equations are approved by comparing with the related theory. The accuracy and efficiency of the EPILE+FBM are compared with the method...
Gyro-traveling wave tube amplifier has become one of the most promising amplifiers in recent years for large power capacity of single-tube, wide frequency band. The biggest difficulty of design gyro-traveling wave tube is how to suppress various spurious oscillations modes competition. gyrotron backward wave oscillation, as one of the most important spurious oscillation, will greatly reduce the amplifier's...
Using the multi-objective hybrid simulated annealing algorithm, this paper optimal design the three-phase induction motor. Typical examples of optimization show the efficiency and feasibility of this method.
Manifold learning algorithms, such as ISOMAP, LLE, Laplacian Eigenmaps, LTSA and so on, are designed to map nonlinear high dimensional data into the low dimensional space. The key of their success is to select a suitable neighborhood parameter. However, it is difficult to determine a proper neighborhood size for most of manifold learning methods, in particular for non-uniform data sets. An adaptive...
In this paper, a fuzzy clustering iterative model is introduced for studying temporal character distribution of precipitation through analysis on the rainfall sequence from 1942 to 2005. According to the clustering results of rainfall temporal distribution features, variation trend of watershed runoff under different temporal distribution pattern has been studied. Furthermore, the impact of human...
The moisture control for sinter mixture is always a difficulty in industry. This paper presents a modeling for the Pb-Zn sintering process of Imperial Smelting Process(ISP), which is to solve the modeling of permeability and parameters of sintering technical. An intelligent system for controlling moisture of sinter mixture based on ABPM artificial neural network is developed for the purpose. The BP...
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